Pileus Git - ~andy/linux/blob - arch/x86/kvm/x86.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * derived from drivers/kvm/kvm_main.c
   5  *
   6  * Copyright (C) 2006 Qumranet, Inc.
   7  * Copyright (C) 2008 Qumranet, Inc.
   8  * Copyright IBM Corporation, 2008
   9  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
  10  *
  11  * Authors:
  12  *   Avi Kivity   <avi@qumranet.com>
  13  *   Yaniv Kamay  <yaniv@qumranet.com>
  14  *   Amit Shah    <amit.shah@qumranet.com>
  15  *   Ben-Ami Yassour <benami@il.ibm.com>
  16  *
  17  * This work is licensed under the terms of the GNU GPL, version 2.  See
  18  * the COPYING file in the top-level directory.
  19  *
  20  */
  21
  22 #include <linux/kvm_host.h>
  23 #include "irq.h"
  24 #include "mmu.h"
  25 #include "i8254.h"
  26 #include "tss.h"
  27 #include "kvm_cache_regs.h"
  28 #include "x86.h"
  29 #include "cpuid.h"
  30
  31 #include <linux/clocksource.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/kvm.h>
  34 #include <linux/fs.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/module.h>
  37 #include <linux/mman.h>
  38 #include <linux/highmem.h>
  39 #include <linux/iommu.h>
  40 #include <linux/intel-iommu.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/user-return-notifier.h>
  43 #include <linux/srcu.h>
  44 #include <linux/slab.h>
  45 #include <linux/perf_event.h>
  46 #include <linux/uaccess.h>
  47 #include <linux/hash.h>
  48 #include <linux/pci.h>
  49 #include <trace/events/kvm.h>
  50
  51 #define CREATE_TRACE_POINTS
  52 #include "trace.h"
  53
  54 #include <asm/debugreg.h>
  55 #include <asm/msr.h>
  56 #include <asm/desc.h>
  57 #include <asm/mtrr.h>
  58 #include <asm/mce.h>
  59 #include <asm/i387.h>
  60 #include <asm/fpu-internal.h> /* Ugh! */
  61 #include <asm/xcr.h>
  62 #include <asm/pvclock.h>
  63 #include <asm/div64.h>
  64
  65 #define MAX_IO_MSRS 256
  66 #define KVM_MAX_MCE_BANKS 32
  67 #define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
  68
  69 #define emul_to_vcpu(ctxt) \
  70         container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt)
  71
  72 /* EFER defaults:
  73  * - enable syscall per default because its emulated by KVM
  74  * - enable LME and LMA per default on 64 bit KVM
  75  */
  76 #ifdef CONFIG_X86_64
  77 static
  78 u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA));
  79 #else
  80 static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
  81 #endif
  82
  83 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  84 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  85
  86 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
  87 static void process_nmi(struct kvm_vcpu *vcpu);
  88
  89 struct kvm_x86_ops *kvm_x86_ops;
  90 EXPORT_SYMBOL_GPL(kvm_x86_ops);
  91
  92 static bool ignore_msrs = 0;
  93 module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR);
  94
  95 bool kvm_has_tsc_control;
  96 EXPORT_SYMBOL_GPL(kvm_has_tsc_control);
  97 u32  kvm_max_guest_tsc_khz;
  98 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz);
  99
 100 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
 101 static u32 tsc_tolerance_ppm = 250;
 102 module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR);
 103
 104 #define KVM_NR_SHARED_MSRS 16
 105
 106 struct kvm_shared_msrs_global {
 107         int nr;
 108         u32 msrs[KVM_NR_SHARED_MSRS];
 109 };
 110
 111 struct kvm_shared_msrs {
 112         struct user_return_notifier urn;
 113         bool registered;
 114         struct kvm_shared_msr_values {
 115                 u64 host;
 116                 u64 curr;
 117         } values[KVM_NR_SHARED_MSRS];
 118 };
 119
 120 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
 121 static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs);
 122
 123 struct kvm_stats_debugfs_item debugfs_entries[] = {
 124         { "pf_fixed", VCPU_STAT(pf_fixed) },
 125         { "pf_guest", VCPU_STAT(pf_guest) },
 126         { "tlb_flush", VCPU_STAT(tlb_flush) },
 127         { "invlpg", VCPU_STAT(invlpg) },
 128         { "exits", VCPU_STAT(exits) },
 129         { "io_exits", VCPU_STAT(io_exits) },
 130         { "mmio_exits", VCPU_STAT(mmio_exits) },
 131         { "signal_exits", VCPU_STAT(signal_exits) },
 132         { "irq_window", VCPU_STAT(irq_window_exits) },
 133         { "nmi_window", VCPU_STAT(nmi_window_exits) },
 134         { "halt_exits", VCPU_STAT(halt_exits) },
 135         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
 136         { "hypercalls", VCPU_STAT(hypercalls) },
 137         { "request_irq", VCPU_STAT(request_irq_exits) },
 138         { "irq_exits", VCPU_STAT(irq_exits) },
 139         { "host_state_reload", VCPU_STAT(host_state_reload) },
 140         { "efer_reload", VCPU_STAT(efer_reload) },
 141         { "fpu_reload", VCPU_STAT(fpu_reload) },
 142         { "insn_emulation", VCPU_STAT(insn_emulation) },
 143         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
 144         { "irq_injections", VCPU_STAT(irq_injections) },
 145         { "nmi_injections", VCPU_STAT(nmi_injections) },
 146         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
 147         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
 148         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
 149         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
 150         { "mmu_flooded", VM_STAT(mmu_flooded) },
 151         { "mmu_recycled", VM_STAT(mmu_recycled) },
 152         { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
 153         { "mmu_unsync", VM_STAT(mmu_unsync) },
 154         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
 155         { "largepages", VM_STAT(lpages) },
 156         { NULL }
 157 };
 158
 159 u64 __read_mostly host_xcr0;
 160
 161 int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt);
 162
 163 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
 164 {
 165         int i;
 166         for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++)
 167                 vcpu->arch.apf.gfns[i] = ~0;
 168 }
 169
 170 static void kvm_on_user_return(struct user_return_notifier *urn)
 171 {
 172         unsigned slot;
 173         struct kvm_shared_msrs *locals
 174                 = container_of(urn, struct kvm_shared_msrs, urn);
 175         struct kvm_shared_msr_values *values;
 176
 177         for (slot = 0; slot < shared_msrs_global.nr; ++slot) {
 178                 values = &locals->values[slot];
 179                 if (values->host != values->curr) {
 180                         wrmsrl(shared_msrs_global.msrs[slot], values->host);
 181                         values->curr = values->host;
 182                 }
 183         }
 184         locals->registered = false;
 185         user_return_notifier_unregister(urn);
 186 }
 187
 188 static void shared_msr_update(unsigned slot, u32 msr)
 189 {
 190         struct kvm_shared_msrs *smsr;
 191         u64 value;
 192
 193         smsr = &__get_cpu_var(shared_msrs);
 194         /* only read, and nobody should modify it at this time,
 195          * so don't need lock */
 196         if (slot >= shared_msrs_global.nr) {
 197                 printk(KERN_ERR "kvm: invalid MSR slot!");
 198                 return;
 199         }
 200         rdmsrl_safe(msr, &value);
 201         smsr->values[slot].host = value;
 202         smsr->values[slot].curr = value;
 203 }
 204
 205 void kvm_define_shared_msr(unsigned slot, u32 msr)
 206 {
 207         if (slot >= shared_msrs_global.nr)
 208                 shared_msrs_global.nr = slot + 1;
 209         shared_msrs_global.msrs[slot] = msr;
 210         /* we need ensured the shared_msr_global have been updated */
 211         smp_wmb();
 212 }
 213 EXPORT_SYMBOL_GPL(kvm_define_shared_msr);
 214
 215 static void kvm_shared_msr_cpu_online(void)
 216 {
 217         unsigned i;
 218
 219         for (i = 0; i < shared_msrs_global.nr; ++i)
 220                 shared_msr_update(i, shared_msrs_global.msrs[i]);
 221 }
 222
 223 void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
 224 {
 225         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 226
 227         if (((value ^ smsr->values[slot].curr) & mask) == 0)
 228                 return;
 229         smsr->values[slot].curr = value;
 230         wrmsrl(shared_msrs_global.msrs[slot], value);
 231         if (!smsr->registered) {
 232                 smsr->urn.on_user_return = kvm_on_user_return;
 233                 user_return_notifier_register(&smsr->urn);
 234                 smsr->registered = true;
 235         }
 236 }
 237 EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
 238
 239 static void drop_user_return_notifiers(void *ignore)
 240 {
 241         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 242
 243         if (smsr->registered)
 244                 kvm_on_user_return(&smsr->urn);
 245 }
 246
 247 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 248 {
 249         return vcpu->arch.apic_base;
 250 }
 251 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 252
 253 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 254 {
 255         /* TODO: reserve bits check */
 256         kvm_lapic_set_base(vcpu, data);
 257 }
 258 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 259
 260 #define EXCPT_BENIGN            0
 261 #define EXCPT_CONTRIBUTORY      1
 262 #define EXCPT_PF                2
 263
 264 static int exception_class(int vector)
 265 {
 266         switch (vector) {
 267         case PF_VECTOR:
 268                 return EXCPT_PF;
 269         case DE_VECTOR:
 270         case TS_VECTOR:
 271         case NP_VECTOR:
 272         case SS_VECTOR:
 273         case GP_VECTOR:
 274                 return EXCPT_CONTRIBUTORY;
 275         default:
 276                 break;
 277         }
 278         return EXCPT_BENIGN;
 279 }
 280
 281 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
 282                 unsigned nr, bool has_error, u32 error_code,
 283                 bool reinject)
 284 {
 285         u32 prev_nr;
 286         int class1, class2;
 287
 288         kvm_make_request(KVM_REQ_EVENT, vcpu);
 289
 290         if (!vcpu->arch.exception.pending) {
 291         queue:
 292                 vcpu->arch.exception.pending = true;
 293                 vcpu->arch.exception.has_error_code = has_error;
 294                 vcpu->arch.exception.nr = nr;
 295                 vcpu->arch.exception.error_code = error_code;
 296                 vcpu->arch.exception.reinject = reinject;
 297                 return;
 298         }
 299
 300         /* to check exception */
 301         prev_nr = vcpu->arch.exception.nr;
 302         if (prev_nr == DF_VECTOR) {
 303                 /* triple fault -> shutdown */
 304                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
 305                 return;
 306         }
 307         class1 = exception_class(prev_nr);
 308         class2 = exception_class(nr);
 309         if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
 310                 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
 311                 /* generate double fault per SDM Table 5-5 */
 312                 vcpu->arch.exception.pending = true;
 313                 vcpu->arch.exception.has_error_code = true;
 314                 vcpu->arch.exception.nr = DF_VECTOR;
 315                 vcpu->arch.exception.error_code = 0;
 316         } else
 317                 /* replace previous exception with a new one in a hope
 318                    that instruction re-execution will regenerate lost
 319                    exception */
 320                 goto queue;
 321 }
 322
 323 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 324 {
 325         kvm_multiple_exception(vcpu, nr, false, 0, false);
 326 }
 327 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 328
 329 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 330 {
 331         kvm_multiple_exception(vcpu, nr, false, 0, true);
 332 }
 333 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
 334
 335 void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
 336 {
 337         if (err)
 338                 kvm_inject_gp(vcpu, 0);
 339         else
 340                 kvm_x86_ops->skip_emulated_instruction(vcpu);
 341 }
 342 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
 343
 344 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
 345 {
 346         ++vcpu->stat.pf_guest;
 347         vcpu->arch.cr2 = fault->address;
 348         kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);
 349 }
 350 EXPORT_SYMBOL_GPL(kvm_inject_page_fault);
 351
 352 void kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
 353 {
 354         if (mmu_is_nested(vcpu) && !fault->nested_page_fault)
 355                 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault);
 356         else
 357                 vcpu->arch.mmu.inject_page_fault(vcpu, fault);
 358 }
 359
 360 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
 361 {
 362         atomic_inc(&vcpu->arch.nmi_queued);
 363         kvm_make_request(KVM_REQ_NMI, vcpu);
 364 }
 365 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
 366
 367 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 368 {
 369         kvm_multiple_exception(vcpu, nr, true, error_code, false);
 370 }
 371 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 372
 373 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 374 {
 375         kvm_multiple_exception(vcpu, nr, true, error_code, true);
 376 }
 377 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
 378
 379 /*
 380  * Checks if cpl <= required_cpl; if true, return true.  Otherwise queue
 381  * a #GP and return false.
 382  */
 383 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
 384 {
 385         if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
 386                 return true;
 387         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
 388         return false;
 389 }
 390 EXPORT_SYMBOL_GPL(kvm_require_cpl);
 391
 392 /*
 393  * This function will be used to read from the physical memory of the currently
 394  * running guest. The difference to kvm_read_guest_page is that this function
 395  * can read from guest physical or from the guest's guest physical memory.
 396  */
 397 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 398                             gfn_t ngfn, void *data, int offset, int len,
 399                             u32 access)
 400 {
 401         gfn_t real_gfn;
 402         gpa_t ngpa;
 403
 404         ngpa     = gfn_to_gpa(ngfn);
 405         real_gfn = mmu->translate_gpa(vcpu, ngpa, access);
 406         if (real_gfn == UNMAPPED_GVA)
 407                 return -EFAULT;
 408
 409         real_gfn = gpa_to_gfn(real_gfn);
 410
 411         return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
 412 }
 413 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
 414
 415 int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
 416                                void *data, int offset, int len, u32 access)
 417 {
 418         return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
 419                                        data, offset, len, access);
 420 }
 421
 422 /*
 423  * Load the pae pdptrs.  Return true is they are all valid.
 424  */
 425 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
 426 {
 427         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 428         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 429         int i;
 430         int ret;
 431         u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
 432
 433         ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
 434                                       offset * sizeof(u64), sizeof(pdpte),
 435                                       PFERR_USER_MASK|PFERR_WRITE_MASK);
 436         if (ret < 0) {
 437                 ret = 0;
 438                 goto out;
 439         }
 440         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 441                 if (is_present_gpte(pdpte[i]) &&
 442                     (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
 443                         ret = 0;
 444                         goto out;
 445                 }
 446         }
 447         ret = 1;
 448
 449         memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
 450         __set_bit(VCPU_EXREG_PDPTR,
 451                   (unsigned long *)&vcpu->arch.regs_avail);
 452         __set_bit(VCPU_EXREG_PDPTR,
 453                   (unsigned long *)&vcpu->arch.regs_dirty);
 454 out:
 455
 456         return ret;
 457 }
 458 EXPORT_SYMBOL_GPL(load_pdptrs);
 459
 460 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 461 {
 462         u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
 463         bool changed = true;
 464         int offset;
 465         gfn_t gfn;
 466         int r;
 467
 468         if (is_long_mode(vcpu) || !is_pae(vcpu))
 469                 return false;
 470
 471         if (!test_bit(VCPU_EXREG_PDPTR,
 472                       (unsigned long *)&vcpu->arch.regs_avail))
 473                 return true;
 474
 475         gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
 476         offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
 477         r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
 478                                        PFERR_USER_MASK | PFERR_WRITE_MASK);
 479         if (r < 0)
 480                 goto out;
 481         changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
 482 out:
 483
 484         return changed;
 485 }
 486
 487 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 488 {
 489         unsigned long old_cr0 = kvm_read_cr0(vcpu);
 490         unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
 491                                     X86_CR0_CD | X86_CR0_NW;
 492
 493         cr0 |= X86_CR0_ET;
 494
 495 #ifdef CONFIG_X86_64
 496         if (cr0 & 0xffffffff00000000UL)
 497                 return 1;
 498 #endif
 499
 500         cr0 &= ~CR0_RESERVED_BITS;
 501
 502         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
 503                 return 1;
 504
 505         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
 506                 return 1;
 507
 508         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 509 #ifdef CONFIG_X86_64
 510                 if ((vcpu->arch.efer & EFER_LME)) {
 511                         int cs_db, cs_l;
 512
 513                         if (!is_pae(vcpu))
 514                                 return 1;
 515                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 516                         if (cs_l)
 517                                 return 1;
 518                 } else
 519 #endif
 520                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
 521                                                  kvm_read_cr3(vcpu)))
 522                         return 1;
 523         }
 524
 525         if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE))
 526                 return 1;
 527
 528         kvm_x86_ops->set_cr0(vcpu, cr0);
 529
 530         if ((cr0 ^ old_cr0) & X86_CR0_PG) {
 531                 kvm_clear_async_pf_completion_queue(vcpu);
 532                 kvm_async_pf_hash_reset(vcpu);
 533         }
 534
 535         if ((cr0 ^ old_cr0) & update_bits)
 536                 kvm_mmu_reset_context(vcpu);
 537         return 0;
 538 }
 539 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 540
 541 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 542 {
 543         (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
 544 }
 545 EXPORT_SYMBOL_GPL(kvm_lmsw);
 546
 547 int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 548 {
 549         u64 xcr0;
 550
 551         /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now  */
 552         if (index != XCR_XFEATURE_ENABLED_MASK)
 553                 return 1;
 554         xcr0 = xcr;
 555         if (kvm_x86_ops->get_cpl(vcpu) != 0)
 556                 return 1;
 557         if (!(xcr0 & XSTATE_FP))
 558                 return 1;
 559         if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
 560                 return 1;
 561         if (xcr0 & ~host_xcr0)
 562                 return 1;
 563         vcpu->arch.xcr0 = xcr0;
 564         vcpu->guest_xcr0_loaded = 0;
 565         return 0;
 566 }
 567
 568 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 569 {
 570         if (__kvm_set_xcr(vcpu, index, xcr)) {
 571                 kvm_inject_gp(vcpu, 0);
 572                 return 1;
 573         }
 574         return 0;
 575 }
 576 EXPORT_SYMBOL_GPL(kvm_set_xcr);
 577
 578 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 579 {
 580         unsigned long old_cr4 = kvm_read_cr4(vcpu);
 581         unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE |
 582                                    X86_CR4_PAE | X86_CR4_SMEP;
 583         if (cr4 & CR4_RESERVED_BITS)
 584                 return 1;
 585
 586         if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE))
 587                 return 1;
 588
 589         if (!guest_cpuid_has_smep(vcpu) && (cr4 & X86_CR4_SMEP))
 590                 return 1;
 591
 592         if (!guest_cpuid_has_fsgsbase(vcpu) && (cr4 & X86_CR4_RDWRGSFS))
 593                 return 1;
 594
 595         if (is_long_mode(vcpu)) {
 596                 if (!(cr4 & X86_CR4_PAE))
 597                         return 1;
 598         } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
 599                    && ((cr4 ^ old_cr4) & pdptr_bits)
 600                    && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
 601                                    kvm_read_cr3(vcpu)))
 602                 return 1;
 603
 604         if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) {
 605                 if (!guest_cpuid_has_pcid(vcpu))
 606                         return 1;
 607
 608                 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */
 609                 if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu))
 610                         return 1;
 611         }
 612
 613         if (kvm_x86_ops->set_cr4(vcpu, cr4))
 614                 return 1;
 615
 616         if (((cr4 ^ old_cr4) & pdptr_bits) ||
 617             (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)))
 618                 kvm_mmu_reset_context(vcpu);
 619
 620         if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
 621                 kvm_update_cpuid(vcpu);
 622
 623         return 0;
 624 }
 625 EXPORT_SYMBOL_GPL(kvm_set_cr4);
 626
 627 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 628 {
 629         if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) {
 630                 kvm_mmu_sync_roots(vcpu);
 631                 kvm_mmu_flush_tlb(vcpu);
 632                 return 0;
 633         }
 634
 635         if (is_long_mode(vcpu)) {
 636                 if (kvm_read_cr4(vcpu) & X86_CR4_PCIDE) {
 637                         if (cr3 & CR3_PCID_ENABLED_RESERVED_BITS)
 638                                 return 1;
 639                 } else
 640                         if (cr3 & CR3_L_MODE_RESERVED_BITS)
 641                                 return 1;
 642         } else {
 643                 if (is_pae(vcpu)) {
 644                         if (cr3 & CR3_PAE_RESERVED_BITS)
 645                                 return 1;
 646                         if (is_paging(vcpu) &&
 647                             !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
 648                                 return 1;
 649                 }
 650                 /*
 651                  * We don't check reserved bits in nonpae mode, because
 652                  * this isn't enforced, and VMware depends on this.
 653                  */
 654         }
 655
 656         /*
 657          * Does the new cr3 value map to physical memory? (Note, we
 658          * catch an invalid cr3 even in real-mode, because it would
 659          * cause trouble later on when we turn on paging anyway.)
 660          *
 661          * A real CPU would silently accept an invalid cr3 and would
 662          * attempt to use it - with largely undefined (and often hard
 663          * to debug) behavior on the guest side.
 664          */
 665         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 666                 return 1;
 667         vcpu->arch.cr3 = cr3;
 668         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
 669         vcpu->arch.mmu.new_cr3(vcpu);
 670         return 0;
 671 }
 672 EXPORT_SYMBOL_GPL(kvm_set_cr3);
 673
 674 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 675 {
 676         if (cr8 & CR8_RESERVED_BITS)
 677                 return 1;
 678         if (irqchip_in_kernel(vcpu->kvm))
 679                 kvm_lapic_set_tpr(vcpu, cr8);
 680         else
 681                 vcpu->arch.cr8 = cr8;
 682         return 0;
 683 }
 684 EXPORT_SYMBOL_GPL(kvm_set_cr8);
 685
 686 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
 687 {
 688         if (irqchip_in_kernel(vcpu->kvm))
 689                 return kvm_lapic_get_cr8(vcpu);
 690         else
 691                 return vcpu->arch.cr8;
 692 }
 693 EXPORT_SYMBOL_GPL(kvm_get_cr8);
 694
 695 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 696 {
 697         switch (dr) {
 698         case 0 ... 3:
 699                 vcpu->arch.db[dr] = val;
 700                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
 701                         vcpu->arch.eff_db[dr] = val;
 702                 break;
 703         case 4:
 704                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 705                         return 1; /* #UD */
 706                 /* fall through */
 707         case 6:
 708                 if (val & 0xffffffff00000000ULL)
 709                         return -1; /* #GP */
 710                 vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
 711                 break;
 712         case 5:
 713                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 714                         return 1; /* #UD */
 715                 /* fall through */
 716         default: /* 7 */
 717                 if (val & 0xffffffff00000000ULL)
 718                         return -1; /* #GP */
 719                 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
 720                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
 721                         kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7);
 722                         vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK);
 723                 }
 724                 break;
 725         }
 726
 727         return 0;
 728 }
 729
 730 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 731 {
 732         int res;
 733
 734         res = __kvm_set_dr(vcpu, dr, val);
 735         if (res > 0)
 736                 kvm_queue_exception(vcpu, UD_VECTOR);
 737         else if (res < 0)
 738                 kvm_inject_gp(vcpu, 0);
 739
 740         return res;
 741 }
 742 EXPORT_SYMBOL_GPL(kvm_set_dr);
 743
 744 static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 745 {
 746         switch (dr) {
 747         case 0 ... 3:
 748                 *val = vcpu->arch.db[dr];
 749                 break;
 750         case 4:
 751                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 752                         return 1;
 753                 /* fall through */
 754         case 6:
 755                 *val = vcpu->arch.dr6;
 756                 break;
 757         case 5:
 758                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 759                         return 1;
 760                 /* fall through */
 761         default: /* 7 */
 762                 *val = vcpu->arch.dr7;
 763                 break;
 764         }
 765
 766         return 0;
 767 }
 768
 769 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 770 {
 771         if (_kvm_get_dr(vcpu, dr, val)) {
 772                 kvm_queue_exception(vcpu, UD_VECTOR);
 773                 return 1;
 774         }
 775         return 0;
 776 }
 777 EXPORT_SYMBOL_GPL(kvm_get_dr);
 778
 779 bool kvm_rdpmc(struct kvm_vcpu *vcpu)
 780 {
 781         u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
 782         u64 data;
 783         int err;
 784
 785         err = kvm_pmu_read_pmc(vcpu, ecx, &data);
 786         if (err)
 787                 return err;
 788         kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data);
 789         kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32);
 790         return err;
 791 }
 792 EXPORT_SYMBOL_GPL(kvm_rdpmc);
 793
 794 /*
 795  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 796  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 797  *
 798  * This list is modified at module load time to reflect the
 799  * capabilities of the host cpu. This capabilities test skips MSRs that are
 800  * kvm-specific. Those are put in the beginning of the list.
 801  */
 802
 803 #define KVM_SAVE_MSRS_BEGIN     10
 804 static u32 msrs_to_save[] = {
 805         MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
 806         MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
 807         HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
 808         HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
 809         MSR_KVM_PV_EOI_EN,
 810         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
 811         MSR_STAR,
 812 #ifdef CONFIG_X86_64
 813         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
 814 #endif
 815         MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
 816 };
 817
 818 static unsigned num_msrs_to_save;
 819
 820 static const u32 emulated_msrs[] = {
 821         MSR_IA32_TSCDEADLINE,
 822         MSR_IA32_MISC_ENABLE,
 823         MSR_IA32_MCG_STATUS,
 824         MSR_IA32_MCG_CTL,
 825 };
 826
 827 static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
 828 {
 829         u64 old_efer = vcpu->arch.efer;
 830
 831         if (efer & efer_reserved_bits)
 832                 return 1;
 833
 834         if (is_paging(vcpu)
 835             && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
 836                 return 1;
 837
 838         if (efer & EFER_FFXSR) {
 839                 struct kvm_cpuid_entry2 *feat;
 840
 841                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 842                 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
 843                         return 1;
 844         }
 845
 846         if (efer & EFER_SVME) {
 847                 struct kvm_cpuid_entry2 *feat;
 848
 849                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 850                 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
 851                         return 1;
 852         }
 853
 854         efer &= ~EFER_LMA;
 855         efer |= vcpu->arch.efer & EFER_LMA;
 856
 857         kvm_x86_ops->set_efer(vcpu, efer);
 858
 859         vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
 860
 861         /* Update reserved bits */
 862         if ((efer ^ old_efer) & EFER_NX)
 863                 kvm_mmu_reset_context(vcpu);
 864
 865         return 0;
 866 }
 867
 868 void kvm_enable_efer_bits(u64 mask)
 869 {
 870        efer_reserved_bits &= ~mask;
 871 }
 872 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
 873
 874
 875 /*
 876  * Writes msr value into into the appropriate "register".
 877  * Returns 0 on success, non-0 otherwise.
 878  * Assumes vcpu_load() was already called.
 879  */
 880 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 881 {
 882         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 883 }
 884
 885 /*
 886  * Adapt set_msr() to msr_io()'s calling convention
 887  */
 888 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 889 {
 890         return kvm_set_msr(vcpu, index, *data);
 891 }
 892
 893 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 894 {
 895         int version;
 896         int r;
 897         struct pvclock_wall_clock wc;
 898         struct timespec boot;
 899
 900         if (!wall_clock)
 901                 return;
 902
 903         r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
 904         if (r)
 905                 return;
 906
 907         if (version & 1)
 908                 ++version;  /* first time write, random junk */
 909
 910         ++version;
 911
 912         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 913
 914         /*
 915          * The guest calculates current wall clock time by adding
 916          * system time (updated by kvm_guest_time_update below) to the
 917          * wall clock specified here.  guest system time equals host
 918          * system time for us, thus we must fill in host boot time here.
 919          */
 920         getboottime(&boot);
 921
 922         if (kvm->arch.kvmclock_offset) {
 923                 struct timespec ts = ns_to_timespec(kvm->arch.kvmclock_offset);
 924                 boot = timespec_sub(boot, ts);
 925         }
 926         wc.sec = boot.tv_sec;
 927         wc.nsec = boot.tv_nsec;
 928         wc.version = version;
 929
 930         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
 931
 932         version++;
 933         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 934 }
 935
 936 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
 937 {
 938         uint32_t quotient, remainder;
 939
 940         /* Don't try to replace with do_div(), this one calculates
 941          * "(dividend << 32) / divisor" */
 942         __asm__ ( "divl %4"
 943                   : "=a" (quotient), "=d" (remainder)
 944                   : "0" (0), "1" (dividend), "r" (divisor) );
 945         return quotient;
 946 }
 947
 948 static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
 949                                s8 *pshift, u32 *pmultiplier)
 950 {
 951         uint64_t scaled64;
 952         int32_t  shift = 0;
 953         uint64_t tps64;
 954         uint32_t tps32;
 955
 956         tps64 = base_khz * 1000LL;
 957         scaled64 = scaled_khz * 1000LL;
 958         while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
 959                 tps64 >>= 1;
 960                 shift--;
 961         }
 962
 963         tps32 = (uint32_t)tps64;
 964         while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
 965                 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
 966                         scaled64 >>= 1;
 967                 else
 968                         tps32 <<= 1;
 969                 shift++;
 970         }
 971
 972         *pshift = shift;
 973         *pmultiplier = div_frac(scaled64, tps32);
 974
 975         pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
 976                  __func__, base_khz, scaled_khz, shift, *pmultiplier);
 977 }
 978
 979 static inline u64 get_kernel_ns(void)
 980 {
 981         struct timespec ts;
 982
 983         WARN_ON(preemptible());
 984         ktime_get_ts(&ts);
 985         monotonic_to_bootbased(&ts);
 986         return timespec_to_ns(&ts);
 987 }
 988
 989 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
 990 unsigned long max_tsc_khz;
 991
 992 static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
 993 {
 994         return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult,
 995                                    vcpu->arch.virtual_tsc_shift);
 996 }
 997
 998 static u32 adjust_tsc_khz(u32 khz, s32 ppm)
 999 {
1000         u64 v = (u64)khz * (1000000 + ppm);
1001         do_div(v, 1000000);
1002         return v;
1003 }
1004
1005 static void kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 this_tsc_khz)
1006 {
1007         u32 thresh_lo, thresh_hi;
1008         int use_scaling = 0;
1009
1010         /* Compute a scale to convert nanoseconds in TSC cycles */
1011         kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
1012                            &vcpu->arch.virtual_tsc_shift,
1013                            &vcpu->arch.virtual_tsc_mult);
1014         vcpu->arch.virtual_tsc_khz = this_tsc_khz;
1015
1016         /*
1017          * Compute the variation in TSC rate which is acceptable
1018          * within the range of tolerance and decide if the
1019          * rate being applied is within that bounds of the hardware
1020          * rate.  If so, no scaling or compensation need be done.
1021          */
1022         thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm);
1023         thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm);
1024         if (this_tsc_khz < thresh_lo || this_tsc_khz > thresh_hi) {
1025                 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", this_tsc_khz, thresh_lo, thresh_hi);
1026                 use_scaling = 1;
1027         }
1028         kvm_x86_ops->set_tsc_khz(vcpu, this_tsc_khz, use_scaling);
1029 }
1030
1031 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
1032 {
1033         u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec,
1034                                       vcpu->arch.virtual_tsc_mult,
1035                                       vcpu->arch.virtual_tsc_shift);
1036         tsc += vcpu->arch.this_tsc_write;
1037         return tsc;
1038 }
1039
1040 void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data)
1041 {
1042         struct kvm *kvm = vcpu->kvm;
1043         u64 offset, ns, elapsed;
1044         unsigned long flags;
1045         s64 usdiff;
1046
1047         raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
1048         offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
1049         ns = get_kernel_ns();
1050         elapsed = ns - kvm->arch.last_tsc_nsec;
1051
1052         /* n.b - signed multiplication and division required */
1053         usdiff = data - kvm->arch.last_tsc_write;
1054 #ifdef CONFIG_X86_64
1055         usdiff = (usdiff * 1000) / vcpu->arch.virtual_tsc_khz;
1056 #else
1057         /* do_div() only does unsigned */
1058         asm("idivl %2; xor %%edx, %%edx"
1059             : "=A"(usdiff)
1060             : "A"(usdiff * 1000), "rm"(vcpu->arch.virtual_tsc_khz));
1061 #endif
1062         do_div(elapsed, 1000);
1063         usdiff -= elapsed;
1064         if (usdiff < 0)
1065                 usdiff = -usdiff;
1066
1067         /*
1068          * Special case: TSC write with a small delta (1 second) of virtual
1069          * cycle time against real time is interpreted as an attempt to
1070          * synchronize the CPU.
1071          *
1072          * For a reliable TSC, we can match TSC offsets, and for an unstable
1073          * TSC, we add elapsed time in this computation.  We could let the
1074          * compensation code attempt to catch up if we fall behind, but
1075          * it's better to try to match offsets from the beginning.
1076          */
1077         if (usdiff < USEC_PER_SEC &&
1078             vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) {
1079                 if (!check_tsc_unstable()) {
1080                         offset = kvm->arch.cur_tsc_offset;
1081                         pr_debug("kvm: matched tsc offset for %llu\n", data);
1082                 } else {
1083                         u64 delta = nsec_to_cycles(vcpu, elapsed);
1084                         data += delta;
1085                         offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
1086                         pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
1087                 }
1088         } else {
1089                 /*
1090                  * We split periods of matched TSC writes into generations.
1091                  * For each generation, we track the original measured
1092                  * nanosecond time, offset, and write, so if TSCs are in
1093                  * sync, we can match exact offset, and if not, we can match
1094                  * exact software computation in compute_guest_tsc()
1095                  *
1096                  * These values are tracked in kvm->arch.cur_xxx variables.
1097                  */
1098                 kvm->arch.cur_tsc_generation++;
1099                 kvm->arch.cur_tsc_nsec = ns;
1100                 kvm->arch.cur_tsc_write = data;
1101                 kvm->arch.cur_tsc_offset = offset;
1102                 pr_debug("kvm: new tsc generation %u, clock %llu\n",
1103                          kvm->arch.cur_tsc_generation, data);
1104         }
1105
1106         /*
1107          * We also track th most recent recorded KHZ, write and time to
1108          * allow the matching interval to be extended at each write.
1109          */
1110         kvm->arch.last_tsc_nsec = ns;
1111         kvm->arch.last_tsc_write = data;
1112         kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz;
1113
1114         /* Reset of TSC must disable overshoot protection below */
1115         vcpu->arch.hv_clock.tsc_timestamp = 0;
1116         vcpu->arch.last_guest_tsc = data;
1117
1118         /* Keep track of which generation this VCPU has synchronized to */
1119         vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation;
1120         vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec;
1121         vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write;
1122
1123         kvm_x86_ops->write_tsc_offset(vcpu, offset);
1124         raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
1125 }
1126
1127 EXPORT_SYMBOL_GPL(kvm_write_tsc);
1128
1129 static int kvm_guest_time_update(struct kvm_vcpu *v)
1130 {
1131         unsigned long flags;
1132         struct kvm_vcpu_arch *vcpu = &v->arch;
1133         void *shared_kaddr;
1134         unsigned long this_tsc_khz;
1135         s64 kernel_ns, max_kernel_ns;
1136         u64 tsc_timestamp;
1137         u8 pvclock_flags;
1138
1139         /* Keep irq disabled to prevent changes to the clock */
1140         local_irq_save(flags);
1141         tsc_timestamp = kvm_x86_ops->read_l1_tsc(v);
1142         kernel_ns = get_kernel_ns();
1143         this_tsc_khz = __get_cpu_var(cpu_tsc_khz);
1144         if (unlikely(this_tsc_khz == 0)) {
1145                 local_irq_restore(flags);
1146                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
1147                 return 1;
1148         }
1149
1150         /*
1151          * We may have to catch up the TSC to match elapsed wall clock
1152          * time for two reasons, even if kvmclock is used.
1153          *   1) CPU could have been running below the maximum TSC rate
1154          *   2) Broken TSC compensation resets the base at each VCPU
1155          *      entry to avoid unknown leaps of TSC even when running
1156          *      again on the same CPU.  This may cause apparent elapsed
1157          *      time to disappear, and the guest to stand still or run
1158          *      very slowly.
1159          */
1160         if (vcpu->tsc_catchup) {
1161                 u64 tsc = compute_guest_tsc(v, kernel_ns);
1162                 if (tsc > tsc_timestamp) {
1163                         adjust_tsc_offset_guest(v, tsc - tsc_timestamp);
1164                         tsc_timestamp = tsc;
1165                 }
1166         }
1167
1168         local_irq_restore(flags);
1169
1170         if (!vcpu->time_page)
1171                 return 0;
1172
1173         /*
1174          * Time as measured by the TSC may go backwards when resetting the base
1175          * tsc_timestamp.  The reason for this is that the TSC resolution is
1176          * higher than the resolution of the other clock scales.  Thus, many
1177          * possible measurments of the TSC correspond to one measurement of any
1178          * other clock, and so a spread of values is possible.  This is not a
1179          * problem for the computation of the nanosecond clock; with TSC rates
1180          * around 1GHZ, there can only be a few cycles which correspond to one
1181          * nanosecond value, and any path through this code will inevitably
1182          * take longer than that.  However, with the kernel_ns value itself,
1183          * the precision may be much lower, down to HZ granularity.  If the
1184          * first sampling of TSC against kernel_ns ends in the low part of the
1185          * range, and the second in the high end of the range, we can get:
1186          *
1187          * (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new
1188          *
1189          * As the sampling errors potentially range in the thousands of cycles,
1190          * it is possible such a time value has already been observed by the
1191          * guest.  To protect against this, we must compute the system time as
1192          * observed by the guest and ensure the new system time is greater.
1193          */
1194         max_kernel_ns = 0;
1195         if (vcpu->hv_clock.tsc_timestamp) {
1196                 max_kernel_ns = vcpu->last_guest_tsc -
1197                                 vcpu->hv_clock.tsc_timestamp;
1198                 max_kernel_ns = pvclock_scale_delta(max_kernel_ns,
1199                                     vcpu->hv_clock.tsc_to_system_mul,
1200                                     vcpu->hv_clock.tsc_shift);
1201                 max_kernel_ns += vcpu->last_kernel_ns;
1202         }
1203
1204         if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
1205                 kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
1206                                    &vcpu->hv_clock.tsc_shift,
1207                                    &vcpu->hv_clock.tsc_to_system_mul);
1208                 vcpu->hw_tsc_khz = this_tsc_khz;
1209         }
1210
1211         if (max_kernel_ns > kernel_ns)
1212                 kernel_ns = max_kernel_ns;
1213
1214         /* With all the info we got, fill in the values */
1215         vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
1216         vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
1217         vcpu->last_kernel_ns = kernel_ns;
1218         vcpu->last_guest_tsc = tsc_timestamp;
1219
1220         pvclock_flags = 0;
1221         if (vcpu->pvclock_set_guest_stopped_request) {
1222                 pvclock_flags |= PVCLOCK_GUEST_STOPPED;
1223                 vcpu->pvclock_set_guest_stopped_request = false;
1224         }
1225
1226         vcpu->hv_clock.flags = pvclock_flags;
1227
1228         /*
1229          * The interface expects us to write an even number signaling that the
1230          * update is finished. Since the guest won't see the intermediate
1231          * state, we just increase by 2 at the end.
1232          */
1233         vcpu->hv_clock.version += 2;
1234
1235         shared_kaddr = kmap_atomic(vcpu->time_page);
1236
1237         memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
1238                sizeof(vcpu->hv_clock));
1239
1240         kunmap_atomic(shared_kaddr);
1241
1242         mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
1243         return 0;
1244 }
1245
1246 static bool msr_mtrr_valid(unsigned msr)
1247 {
1248         switch (msr) {
1249         case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
1250         case MSR_MTRRfix64K_00000:
1251         case MSR_MTRRfix16K_80000:
1252         case MSR_MTRRfix16K_A0000:
1253         case MSR_MTRRfix4K_C0000:
1254         case MSR_MTRRfix4K_C8000:
1255         case MSR_MTRRfix4K_D0000:
1256         case MSR_MTRRfix4K_D8000:
1257         case MSR_MTRRfix4K_E0000:
1258         case MSR_MTRRfix4K_E8000:
1259         case MSR_MTRRfix4K_F0000:
1260         case MSR_MTRRfix4K_F8000:
1261         case MSR_MTRRdefType:
1262         case MSR_IA32_CR_PAT:
1263                 return true;
1264         case 0x2f8:
1265                 return true;
1266         }
1267         return false;
1268 }
1269
1270 static bool valid_pat_type(unsigned t)
1271 {
1272         return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
1273 }
1274
1275 static bool valid_mtrr_type(unsigned t)
1276 {
1277         return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
1278 }
1279
1280 static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1281 {
1282         int i;
1283
1284         if (!msr_mtrr_valid(msr))
1285                 return false;
1286
1287         if (msr == MSR_IA32_CR_PAT) {
1288                 for (i = 0; i < 8; i++)
1289                         if (!valid_pat_type((data >> (i * 8)) & 0xff))
1290                                 return false;
1291                 return true;
1292         } else if (msr == MSR_MTRRdefType) {
1293                 if (data & ~0xcff)
1294                         return false;
1295                 return valid_mtrr_type(data & 0xff);
1296         } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
1297                 for (i = 0; i < 8 ; i++)
1298                         if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
1299                                 return false;
1300                 return true;
1301         }
1302
1303         /* variable MTRRs */
1304         return valid_mtrr_type(data & 0xff);
1305 }
1306
1307 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1308 {
1309         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1310
1311         if (!mtrr_valid(vcpu, msr, data))
1312                 return 1;
1313
1314         if (msr == MSR_MTRRdefType) {
1315                 vcpu->arch.mtrr_state.def_type = data;
1316                 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
1317         } else if (msr == MSR_MTRRfix64K_00000)
1318                 p[0] = data;
1319         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1320                 p[1 + msr - MSR_MTRRfix16K_80000] = data;
1321         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1322                 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
1323         else if (msr == MSR_IA32_CR_PAT)
1324                 vcpu->arch.pat = data;
1325         else {  /* Variable MTRRs */
1326                 int idx, is_mtrr_mask;
1327                 u64 *pt;
1328
1329                 idx = (msr - 0x200) / 2;
1330                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1331                 if (!is_mtrr_mask)
1332                         pt =
1333                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1334                 else
1335                         pt =
1336                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1337                 *pt = data;
1338         }
1339
1340         kvm_mmu_reset_context(vcpu);
1341         return 0;
1342 }
1343
1344 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1345 {
1346         u64 mcg_cap = vcpu->arch.mcg_cap;
1347         unsigned bank_num = mcg_cap & 0xff;
1348
1349         switch (msr) {
1350         case MSR_IA32_MCG_STATUS:
1351                 vcpu->arch.mcg_status = data;
1352                 break;
1353         case MSR_IA32_MCG_CTL:
1354                 if (!(mcg_cap & MCG_CTL_P))
1355                         return 1;
1356                 if (data != 0 && data != ~(u64)0)
1357                         return -1;
1358                 vcpu->arch.mcg_ctl = data;
1359                 break;
1360         default:
1361                 if (msr >= MSR_IA32_MC0_CTL &&
1362                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1363                         u32 offset = msr - MSR_IA32_MC0_CTL;
1364                         /* only 0 or all 1s can be written to IA32_MCi_CTL
1365                          * some Linux kernels though clear bit 10 in bank 4 to
1366                          * workaround a BIOS/GART TBL issue on AMD K8s, ignore
1367                          * this to avoid an uncatched #GP in the guest
1368                          */
1369                         if ((offset & 0x3) == 0 &&
1370                             data != 0 && (data | (1 << 10)) != ~(u64)0)
1371                                 return -1;
1372                         vcpu->arch.mce_banks[offset] = data;
1373                         break;
1374                 }
1375                 return 1;
1376         }
1377         return 0;
1378 }
1379
1380 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
1381 {
1382         struct kvm *kvm = vcpu->kvm;
1383         int lm = is_long_mode(vcpu);
1384         u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
1385                 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
1386         u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
1387                 : kvm->arch.xen_hvm_config.blob_size_32;
1388         u32 page_num = data & ~PAGE_MASK;
1389         u64 page_addr = data & PAGE_MASK;
1390         u8 *page;
1391         int r;
1392
1393         r = -E2BIG;
1394         if (page_num >= blob_size)
1395                 goto out;
1396         r = -ENOMEM;
1397         page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE);
1398         if (IS_ERR(page)) {
1399                 r = PTR_ERR(page);
1400                 goto out;
1401         }
1402         if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
1403                 goto out_free;
1404         r = 0;
1405 out_free:
1406         kfree(page);
1407 out:
1408         return r;
1409 }
1410
1411 static bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1412 {
1413         return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1414 }
1415
1416 static bool kvm_hv_msr_partition_wide(u32 msr)
1417 {
1418         bool r = false;
1419         switch (msr) {
1420         case HV_X64_MSR_GUEST_OS_ID:
1421         case HV_X64_MSR_HYPERCALL:
1422                 r = true;
1423                 break;
1424         }
1425
1426         return r;
1427 }
1428
1429 static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1430 {
1431         struct kvm *kvm = vcpu->kvm;
1432
1433         switch (msr) {
1434         case HV_X64_MSR_GUEST_OS_ID:
1435                 kvm->arch.hv_guest_os_id = data;
1436                 /* setting guest os id to zero disables hypercall page */
1437                 if (!kvm->arch.hv_guest_os_id)
1438                         kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1439                 break;
1440         case HV_X64_MSR_HYPERCALL: {
1441                 u64 gfn;
1442                 unsigned long addr;
1443                 u8 instructions[4];
1444
1445                 /* if guest os id is not set hypercall should remain disabled */
1446                 if (!kvm->arch.hv_guest_os_id)
1447                         break;
1448                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1449                         kvm->arch.hv_hypercall = data;
1450                         break;
1451                 }
1452                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1453                 addr = gfn_to_hva(kvm, gfn);
1454                 if (kvm_is_error_hva(addr))
1455                         return 1;
1456                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
1457                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
1458                 if (__copy_to_user((void __user *)addr, instructions, 4))
1459                         return 1;
1460                 kvm->arch.hv_hypercall = data;
1461                 break;
1462         }
1463         default:
1464                 vcpu_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1465                             "data 0x%llx\n", msr, data);
1466                 return 1;
1467         }
1468         return 0;
1469 }
1470
1471 static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1472 {
1473         switch (msr) {
1474         case HV_X64_MSR_APIC_ASSIST_PAGE: {
1475                 unsigned long addr;
1476
1477                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
1478                         vcpu->arch.hv_vapic = data;
1479                         break;
1480                 }
1481                 addr = gfn_to_hva(vcpu->kvm, data >>
1482                                   HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
1483                 if (kvm_is_error_hva(addr))
1484                         return 1;
1485                 if (__clear_user((void __user *)addr, PAGE_SIZE))
1486                         return 1;
1487                 vcpu->arch.hv_vapic = data;
1488                 break;
1489         }
1490         case HV_X64_MSR_EOI:
1491                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1492         case HV_X64_MSR_ICR:
1493                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1494         case HV_X64_MSR_TPR:
1495                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1496         default:
1497                 vcpu_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1498                             "data 0x%llx\n", msr, data);
1499                 return 1;
1500         }
1501
1502         return 0;
1503 }
1504
1505 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
1506 {
1507         gpa_t gpa = data & ~0x3f;
1508
1509         /* Bits 2:5 are reserved, Should be zero */
1510         if (data & 0x3c)
1511                 return 1;
1512
1513         vcpu->arch.apf.msr_val = data;
1514
1515         if (!(data & KVM_ASYNC_PF_ENABLED)) {
1516                 kvm_clear_async_pf_completion_queue(vcpu);
1517                 kvm_async_pf_hash_reset(vcpu);
1518                 return 0;
1519         }
1520
1521         if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa))
1522                 return 1;
1523
1524         vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
1525         kvm_async_pf_wakeup_all(vcpu);
1526         return 0;
1527 }
1528
1529 static void kvmclock_reset(struct kvm_vcpu *vcpu)
1530 {
1531         if (vcpu->arch.time_page) {
1532                 kvm_release_page_dirty(vcpu->arch.time_page);
1533                 vcpu->arch.time_page = NULL;
1534         }
1535 }
1536
1537 static void accumulate_steal_time(struct kvm_vcpu *vcpu)
1538 {
1539         u64 delta;
1540
1541         if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
1542                 return;
1543
1544         delta = current->sched_info.run_delay - vcpu->arch.st.last_steal;
1545         vcpu->arch.st.last_steal = current->sched_info.run_delay;
1546         vcpu->arch.st.accum_steal = delta;
1547 }
1548
1549 static void record_steal_time(struct kvm_vcpu *vcpu)
1550 {
1551         if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
1552                 return;
1553
1554         if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
1555                 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time))))
1556                 return;
1557
1558         vcpu->arch.st.steal.steal += vcpu->arch.st.accum_steal;
1559         vcpu->arch.st.steal.version += 2;
1560         vcpu->arch.st.accum_steal = 0;
1561
1562         kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
1563                 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
1564 }
1565
1566 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1567 {
1568         bool pr = false;
1569
1570         switch (msr) {
1571         case MSR_EFER:
1572                 return set_efer(vcpu, data);
1573         case MSR_K7_HWCR:
1574                 data &= ~(u64)0x40;     /* ignore flush filter disable */
1575                 data &= ~(u64)0x100;    /* ignore ignne emulation enable */
1576                 data &= ~(u64)0x8;      /* ignore TLB cache disable */
1577                 if (data != 0) {
1578                         vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
1579                                     data);
1580                         return 1;
1581                 }
1582                 break;
1583         case MSR_FAM10H_MMIO_CONF_BASE:
1584                 if (data != 0) {
1585                         vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
1586                                     "0x%llx\n", data);
1587                         return 1;
1588                 }
1589                 break;
1590         case MSR_AMD64_NB_CFG:
1591                 break;
1592         case MSR_IA32_DEBUGCTLMSR:
1593                 if (!data) {
1594                         /* We support the non-activated case already */
1595                         break;
1596                 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
1597                         /* Values other than LBR and BTF are vendor-specific,
1598                            thus reserved and should throw a #GP */
1599                         return 1;
1600                 }
1601                 vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
1602                             __func__, data);
1603                 break;
1604         case MSR_IA32_UCODE_REV:
1605         case MSR_IA32_UCODE_WRITE:
1606         case MSR_VM_HSAVE_PA:
1607         case MSR_AMD64_PATCH_LOADER:
1608                 break;
1609         case 0x200 ... 0x2ff:
1610                 return set_msr_mtrr(vcpu, msr, data);
1611         case MSR_IA32_APICBASE:
1612                 kvm_set_apic_base(vcpu, data);
1613                 break;
1614         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1615                 return kvm_x2apic_msr_write(vcpu, msr, data);
1616         case MSR_IA32_TSCDEADLINE:
1617                 kvm_set_lapic_tscdeadline_msr(vcpu, data);
1618                 break;
1619         case MSR_IA32_MISC_ENABLE:
1620                 vcpu->arch.ia32_misc_enable_msr = data;
1621                 break;
1622         case MSR_KVM_WALL_CLOCK_NEW:
1623         case MSR_KVM_WALL_CLOCK:
1624                 vcpu->kvm->arch.wall_clock = data;
1625                 kvm_write_wall_clock(vcpu->kvm, data);
1626                 break;
1627         case MSR_KVM_SYSTEM_TIME_NEW:
1628         case MSR_KVM_SYSTEM_TIME: {
1629                 kvmclock_reset(vcpu);
1630
1631                 vcpu->arch.time = data;
1632                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
1633
1634                 /* we verify if the enable bit is set... */
1635                 if (!(data & 1))
1636                         break;
1637
1638                 /* ...but clean it before doing the actual write */
1639                 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
1640
1641                 vcpu->arch.time_page =
1642                                 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
1643
1644                 if (is_error_page(vcpu->arch.time_page))
1645                         vcpu->arch.time_page = NULL;
1646
1647                 break;
1648         }
1649         case MSR_KVM_ASYNC_PF_EN:
1650                 if (kvm_pv_enable_async_pf(vcpu, data))
1651                         return 1;
1652                 break;
1653         case MSR_KVM_STEAL_TIME:
1654
1655                 if (unlikely(!sched_info_on()))
1656                         return 1;
1657
1658                 if (data & KVM_STEAL_RESERVED_MASK)
1659                         return 1;
1660
1661                 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime,
1662                                                         data & KVM_STEAL_VALID_BITS))
1663                         return 1;
1664
1665                 vcpu->arch.st.msr_val = data;
1666
1667                 if (!(data & KVM_MSR_ENABLED))
1668                         break;
1669
1670                 vcpu->arch.st.last_steal = current->sched_info.run_delay;
1671
1672                 preempt_disable();
1673                 accumulate_steal_time(vcpu);
1674                 preempt_enable();
1675
1676                 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
1677
1678                 break;
1679         case MSR_KVM_PV_EOI_EN:
1680                 if (kvm_lapic_enable_pv_eoi(vcpu, data))
1681                         return 1;
1682                 break;
1683
1684         case MSR_IA32_MCG_CTL:
1685         case MSR_IA32_MCG_STATUS:
1686         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1687                 return set_msr_mce(vcpu, msr, data);
1688
1689         /* Performance counters are not protected by a CPUID bit,
1690          * so we should check all of them in the generic path for the sake of
1691          * cross vendor migration.
1692          * Writing a zero into the event select MSRs disables them,
1693          * which we perfectly emulate ;-). Any other value should be at least
1694          * reported, some guests depend on them.
1695          */
1696         case MSR_K7_EVNTSEL0:
1697         case MSR_K7_EVNTSEL1:
1698         case MSR_K7_EVNTSEL2:
1699         case MSR_K7_EVNTSEL3:
1700                 if (data != 0)
1701                         vcpu_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1702                                     "0x%x data 0x%llx\n", msr, data);
1703                 break;
1704         /* at least RHEL 4 unconditionally writes to the perfctr registers,
1705          * so we ignore writes to make it happy.
1706          */
1707         case MSR_K7_PERFCTR0:
1708         case MSR_K7_PERFCTR1:
1709         case MSR_K7_PERFCTR2:
1710         case MSR_K7_PERFCTR3:
1711                 vcpu_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1712                             "0x%x data 0x%llx\n", msr, data);
1713                 break;
1714         case MSR_P6_PERFCTR0:
1715         case MSR_P6_PERFCTR1:
1716                 pr = true;
1717         case MSR_P6_EVNTSEL0:
1718         case MSR_P6_EVNTSEL1:
1719                 if (kvm_pmu_msr(vcpu, msr))
1720                         return kvm_pmu_set_msr(vcpu, msr, data);
1721
1722                 if (pr || data != 0)
1723                         vcpu_unimpl(vcpu, "disabled perfctr wrmsr: "
1724                                     "0x%x data 0x%llx\n", msr, data);
1725                 break;
1726         case MSR_K7_CLK_CTL:
1727                 /*
1728                  * Ignore all writes to this no longer documented MSR.
1729                  * Writes are only relevant for old K7 processors,
1730                  * all pre-dating SVM, but a recommended workaround from
1731                  * AMD for these chips. It is possible to specify the
1732                  * affected processor models on the command line, hence
1733                  * the need to ignore the workaround.
1734                  */
1735                 break;
1736         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1737                 if (kvm_hv_msr_partition_wide(msr)) {
1738                         int r;
1739                         mutex_lock(&vcpu->kvm->lock);
1740                         r = set_msr_hyperv_pw(vcpu, msr, data);
1741                         mutex_unlock(&vcpu->kvm->lock);
1742                         return r;
1743                 } else
1744                         return set_msr_hyperv(vcpu, msr, data);
1745                 break;
1746         case MSR_IA32_BBL_CR_CTL3:
1747                 /* Drop writes to this legacy MSR -- see rdmsr
1748                  * counterpart for further detail.
1749                  */
1750                 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data);
1751                 break;
1752         case MSR_AMD64_OSVW_ID_LENGTH:
1753                 if (!guest_cpuid_has_osvw(vcpu))
1754                         return 1;
1755                 vcpu->arch.osvw.length = data;
1756                 break;
1757         case MSR_AMD64_OSVW_STATUS:
1758                 if (!guest_cpuid_has_osvw(vcpu))
1759                         return 1;
1760                 vcpu->arch.osvw.status = data;
1761                 break;
1762         default:
1763                 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
1764                         return xen_hvm_config(vcpu, data);
1765                 if (kvm_pmu_msr(vcpu, msr))
1766                         return kvm_pmu_set_msr(vcpu, msr, data);
1767                 if (!ignore_msrs) {
1768                         vcpu_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
1769                                     msr, data);
1770                         return 1;
1771                 } else {
1772                         vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
1773                                     msr, data);
1774                         break;
1775                 }
1776         }
1777         return 0;
1778 }
1779 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1780
1781
1782 /*
1783  * Reads an msr value (of 'msr_index') into 'pdata'.
1784  * Returns 0 on success, non-0 otherwise.
1785  * Assumes vcpu_load() was already called.
1786  */
1787 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1788 {
1789         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1790 }
1791
1792 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1793 {
1794         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1795
1796         if (!msr_mtrr_valid(msr))
1797                 return 1;
1798
1799         if (msr == MSR_MTRRdefType)
1800                 *pdata = vcpu->arch.mtrr_state.def_type +
1801                          (vcpu->arch.mtrr_state.enabled << 10);
1802         else if (msr == MSR_MTRRfix64K_00000)
1803                 *pdata = p[0];
1804         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1805                 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
1806         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1807                 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
1808         else if (msr == MSR_IA32_CR_PAT)
1809                 *pdata = vcpu->arch.pat;
1810         else {  /* Variable MTRRs */
1811                 int idx, is_mtrr_mask;
1812                 u64 *pt;
1813
1814                 idx = (msr - 0x200) / 2;
1815                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1816                 if (!is_mtrr_mask)
1817                         pt =
1818                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1819                 else
1820                         pt =
1821                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1822                 *pdata = *pt;
1823         }
1824
1825         return 0;
1826 }
1827
1828 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1829 {
1830         u64 data;
1831         u64 mcg_cap = vcpu->arch.mcg_cap;
1832         unsigned bank_num = mcg_cap & 0xff;
1833
1834         switch (msr) {
1835         case MSR_IA32_P5_MC_ADDR:
1836         case MSR_IA32_P5_MC_TYPE:
1837                 data = 0;
1838                 break;
1839         case MSR_IA32_MCG_CAP:
1840                 data = vcpu->arch.mcg_cap;
1841                 break;
1842         case MSR_IA32_MCG_CTL:
1843                 if (!(mcg_cap & MCG_CTL_P))
1844                         return 1;
1845                 data = vcpu->arch.mcg_ctl;
1846                 break;
1847         case MSR_IA32_MCG_STATUS:
1848                 data = vcpu->arch.mcg_status;
1849                 break;
1850         default:
1851                 if (msr >= MSR_IA32_MC0_CTL &&
1852                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1853                         u32 offset = msr - MSR_IA32_MC0_CTL;
1854                         data = vcpu->arch.mce_banks[offset];
1855                         break;
1856                 }
1857                 return 1;
1858         }
1859         *pdata = data;
1860         return 0;
1861 }
1862
1863 static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1864 {
1865         u64 data = 0;
1866         struct kvm *kvm = vcpu->kvm;
1867
1868         switch (msr) {
1869         case HV_X64_MSR_GUEST_OS_ID:
1870                 data = kvm->arch.hv_guest_os_id;
1871                 break;
1872         case HV_X64_MSR_HYPERCALL:
1873                 data = kvm->arch.hv_hypercall;
1874                 break;
1875         default:
1876                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1877                 return 1;
1878         }
1879
1880         *pdata = data;
1881         return 0;
1882 }
1883
1884 static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1885 {
1886         u64 data = 0;
1887
1888         switch (msr) {
1889         case HV_X64_MSR_VP_INDEX: {
1890                 int r;
1891                 struct kvm_vcpu *v;
1892                 kvm_for_each_vcpu(r, v, vcpu->kvm)
1893                         if (v == vcpu)
1894                                 data = r;
1895                 break;
1896         }
1897         case HV_X64_MSR_EOI:
1898                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1899         case HV_X64_MSR_ICR:
1900                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1901         case HV_X64_MSR_TPR:
1902                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1903         case HV_X64_MSR_APIC_ASSIST_PAGE:
1904                 data = vcpu->arch.hv_vapic;
1905                 break;
1906         default:
1907                 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1908                 return 1;
1909         }
1910         *pdata = data;
1911         return 0;
1912 }
1913
1914 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1915 {
1916         u64 data;
1917
1918         switch (msr) {
1919         case MSR_IA32_PLATFORM_ID:
1920         case MSR_IA32_EBL_CR_POWERON:
1921         case MSR_IA32_DEBUGCTLMSR:
1922         case MSR_IA32_LASTBRANCHFROMIP:
1923         case MSR_IA32_LASTBRANCHTOIP:
1924         case MSR_IA32_LASTINTFROMIP:
1925         case MSR_IA32_LASTINTTOIP:
1926         case MSR_K8_SYSCFG:
1927         case MSR_K7_HWCR:
1928         case MSR_VM_HSAVE_PA:
1929         case MSR_K7_EVNTSEL0:
1930         case MSR_K7_PERFCTR0:
1931         case MSR_K8_INT_PENDING_MSG:
1932         case MSR_AMD64_NB_CFG:
1933         case MSR_FAM10H_MMIO_CONF_BASE:
1934                 data = 0;
1935                 break;
1936         case MSR_P6_PERFCTR0:
1937         case MSR_P6_PERFCTR1:
1938         case MSR_P6_EVNTSEL0:
1939         case MSR_P6_EVNTSEL1:
1940                 if (kvm_pmu_msr(vcpu, msr))
1941                         return kvm_pmu_get_msr(vcpu, msr, pdata);
1942                 data = 0;
1943                 break;
1944         case MSR_IA32_UCODE_REV:
1945                 data = 0x100000000ULL;
1946                 break;
1947         case MSR_MTRRcap:
1948                 data = 0x500 | KVM_NR_VAR_MTRR;
1949                 break;
1950         case 0x200 ... 0x2ff:
1951                 return get_msr_mtrr(vcpu, msr, pdata);
1952         case 0xcd: /* fsb frequency */
1953                 data = 3;
1954                 break;
1955                 /*
1956                  * MSR_EBC_FREQUENCY_ID
1957                  * Conservative value valid for even the basic CPU models.
1958                  * Models 0,1: 000 in bits 23:21 indicating a bus speed of
1959                  * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
1960                  * and 266MHz for model 3, or 4. Set Core Clock
1961                  * Frequency to System Bus Frequency Ratio to 1 (bits
1962                  * 31:24) even though these are only valid for CPU
1963                  * models > 2, however guests may end up dividing or
1964                  * multiplying by zero otherwise.
1965                  */
1966         case MSR_EBC_FREQUENCY_ID:
1967                 data = 1 << 24;
1968                 break;
1969         case MSR_IA32_APICBASE:
1970                 data = kvm_get_apic_base(vcpu);
1971                 break;
1972         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1973                 return kvm_x2apic_msr_read(vcpu, msr, pdata);
1974                 break;
1975         case MSR_IA32_TSCDEADLINE:
1976                 data = kvm_get_lapic_tscdeadline_msr(vcpu);
1977                 break;
1978         case MSR_IA32_MISC_ENABLE:
1979                 data = vcpu->arch.ia32_misc_enable_msr;
1980                 break;
1981         case MSR_IA32_PERF_STATUS:
1982                 /* TSC increment by tick */
1983                 data = 1000ULL;
1984                 /* CPU multiplier */
1985                 data |= (((uint64_t)4ULL) << 40);
1986                 break;
1987         case MSR_EFER:
1988                 data = vcpu->arch.efer;
1989                 break;
1990         case MSR_KVM_WALL_CLOCK:
1991         case MSR_KVM_WALL_CLOCK_NEW:
1992                 data = vcpu->kvm->arch.wall_clock;
1993                 break;
1994         case MSR_KVM_SYSTEM_TIME:
1995         case MSR_KVM_SYSTEM_TIME_NEW:
1996                 data = vcpu->arch.time;
1997                 break;
1998         case MSR_KVM_ASYNC_PF_EN:
1999                 data = vcpu->arch.apf.msr_val;
2000                 break;
2001         case MSR_KVM_STEAL_TIME:
2002                 data = vcpu->arch.st.msr_val;
2003                 break;
2004         case MSR_IA32_P5_MC_ADDR:
2005         case MSR_IA32_P5_MC_TYPE:
2006         case MSR_IA32_MCG_CAP:
2007         case MSR_IA32_MCG_CTL:
2008         case MSR_IA32_MCG_STATUS:
2009         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
2010                 return get_msr_mce(vcpu, msr, pdata);
2011         case MSR_K7_CLK_CTL:
2012                 /*
2013                  * Provide expected ramp-up count for K7. All other
2014                  * are set to zero, indicating minimum divisors for
2015                  * every field.
2016                  *
2017                  * This prevents guest kernels on AMD host with CPU
2018                  * type 6, model 8 and higher from exploding due to
2019                  * the rdmsr failing.
2020                  */
2021                 data = 0x20000000;
2022                 break;
2023         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
2024                 if (kvm_hv_msr_partition_wide(msr)) {
2025                         int r;
2026                         mutex_lock(&vcpu->kvm->lock);
2027                         r = get_msr_hyperv_pw(vcpu, msr, pdata);
2028                         mutex_unlock(&vcpu->kvm->lock);
2029                         return r;
2030                 } else
2031                         return get_msr_hyperv(vcpu, msr, pdata);
2032                 break;
2033         case MSR_IA32_BBL_CR_CTL3:
2034                 /* This legacy MSR exists but isn't fully documented in current
2035                  * silicon.  It is however accessed by winxp in very narrow
2036                  * scenarios where it sets bit #19, itself documented as
2037                  * a "reserved" bit.  Best effort attempt to source coherent
2038                  * read data here should the balance of the register be
2039                  * interpreted by the guest:
2040                  *
2041                  * L2 cache control register 3: 64GB range, 256KB size,
2042                  * enabled, latency 0x1, configured
2043                  */
2044                 data = 0xbe702111;
2045                 break;
2046         case MSR_AMD64_OSVW_ID_LENGTH:
2047                 if (!guest_cpuid_has_osvw(vcpu))
2048                         return 1;
2049                 data = vcpu->arch.osvw.length;
2050                 break;
2051         case MSR_AMD64_OSVW_STATUS:
2052                 if (!guest_cpuid_has_osvw(vcpu))
2053                         return 1;
2054                 data = vcpu->arch.osvw.status;
2055                 break;
2056         default:
2057                 if (kvm_pmu_msr(vcpu, msr))
2058                         return kvm_pmu_get_msr(vcpu, msr, pdata);
2059                 if (!ignore_msrs) {
2060                         vcpu_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
2061                         return 1;
2062                 } else {
2063                         vcpu_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
2064                         data = 0;
2065                 }
2066                 break;
2067         }
2068         *pdata = data;
2069         return 0;
2070 }
2071 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
2072
2073 /*
2074  * Read or write a bunch of msrs. All parameters are kernel addresses.
2075  *
2076  * @return number of msrs set successfully.
2077  */
2078 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2079                     struct kvm_msr_entry *entries,
2080                     int (*do_msr)(struct kvm_vcpu *vcpu,
2081                                   unsigned index, u64 *data))
2082 {
2083         int i, idx;
2084
2085         idx = srcu_read_lock(&vcpu->kvm->srcu);
2086         for (i = 0; i < msrs->nmsrs; ++i)
2087                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2088                         break;
2089         srcu_read_unlock(&vcpu->kvm->srcu, idx);
2090
2091         return i;
2092 }
2093
2094 /*
2095  * Read or write a bunch of msrs. Parameters are user addresses.
2096  *
2097  * @return number of msrs set successfully.
2098  */
2099 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2100                   int (*do_msr)(struct kvm_vcpu *vcpu,
2101                                 unsigned index, u64 *data),
2102                   int writeback)
2103 {
2104         struct kvm_msrs msrs;
2105         struct kvm_msr_entry *entries;
2106         int r, n;
2107         unsigned size;
2108
2109         r = -EFAULT;
2110         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2111                 goto out;
2112
2113         r = -E2BIG;
2114         if (msrs.nmsrs >= MAX_IO_MSRS)
2115                 goto out;
2116
2117         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2118         entries = memdup_user(user_msrs->entries, size);
2119         if (IS_ERR(entries)) {
2120                 r = PTR_ERR(entries);
2121                 goto out;
2122         }
2123
2124         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2125         if (r < 0)
2126                 goto out_free;
2127
2128         r = -EFAULT;
2129         if (writeback && copy_to_user(user_msrs->entries, entries, size))
2130                 goto out_free;
2131
2132         r = n;
2133
2134 out_free:
2135         kfree(entries);
2136 out:
2137         return r;
2138 }
2139
2140 int kvm_dev_ioctl_check_extension(long ext)
2141 {
2142         int r;
2143
2144         switch (ext) {
2145         case KVM_CAP_IRQCHIP:
2146         case KVM_CAP_HLT:
2147         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
2148         case KVM_CAP_SET_TSS_ADDR:
2149         case KVM_CAP_EXT_CPUID:
2150         case KVM_CAP_CLOCKSOURCE:
2151         case KVM_CAP_PIT:
2152         case KVM_CAP_NOP_IO_DELAY:
2153         case KVM_CAP_MP_STATE:
2154         case KVM_CAP_SYNC_MMU:
2155         case KVM_CAP_USER_NMI:
2156         case KVM_CAP_REINJECT_CONTROL:
2157         case KVM_CAP_IRQ_INJECT_STATUS:
2158         case KVM_CAP_ASSIGN_DEV_IRQ:
2159         case KVM_CAP_IRQFD:
2160         case KVM_CAP_IOEVENTFD:
2161         case KVM_CAP_PIT2:
2162         case KVM_CAP_PIT_STATE2:
2163         case KVM_CAP_SET_IDENTITY_MAP_ADDR:
2164         case KVM_CAP_XEN_HVM:
2165         case KVM_CAP_ADJUST_CLOCK:
2166         case KVM_CAP_VCPU_EVENTS:
2167         case KVM_CAP_HYPERV:
2168         case KVM_CAP_HYPERV_VAPIC:
2169         case KVM_CAP_HYPERV_SPIN:
2170         case KVM_CAP_PCI_SEGMENT:
2171         case KVM_CAP_DEBUGREGS:
2172         case KVM_CAP_X86_ROBUST_SINGLESTEP:
2173         case KVM_CAP_XSAVE:
2174         case KVM_CAP_ASYNC_PF:
2175         case KVM_CAP_GET_TSC_KHZ:
2176         case KVM_CAP_PCI_2_3:
2177         case KVM_CAP_KVMCLOCK_CTRL:
2178         case KVM_CAP_READONLY_MEM:
2179                 r = 1;
2180                 break;
2181         case KVM_CAP_COALESCED_MMIO:
2182                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
2183                 break;
2184         case KVM_CAP_VAPIC:
2185                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
2186                 break;
2187         case KVM_CAP_NR_VCPUS:
2188                 r = KVM_SOFT_MAX_VCPUS;
2189                 break;
2190         case KVM_CAP_MAX_VCPUS:
2191                 r = KVM_MAX_VCPUS;
2192                 break;
2193         case KVM_CAP_NR_MEMSLOTS:
2194                 r = KVM_MEMORY_SLOTS;
2195                 break;
2196         case KVM_CAP_PV_MMU:    /* obsolete */
2197                 r = 0;
2198                 break;
2199         case KVM_CAP_IOMMU:
2200                 r = iommu_present(&pci_bus_type);
2201                 break;
2202         case KVM_CAP_MCE:
2203                 r = KVM_MAX_MCE_BANKS;
2204                 break;
2205         case KVM_CAP_XCRS:
2206                 r = cpu_has_xsave;
2207                 break;
2208         case KVM_CAP_TSC_CONTROL:
2209                 r = kvm_has_tsc_control;
2210                 break;
2211         case KVM_CAP_TSC_DEADLINE_TIMER:
2212                 r = boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER);
2213                 break;
2214         default:
2215                 r = 0;
2216                 break;
2217         }
2218         return r;
2219
2220 }
2221
2222 long kvm_arch_dev_ioctl(struct file *filp,
2223                         unsigned int ioctl, unsigned long arg)
2224 {
2225         void __user *argp = (void __user *)arg;
2226         long r;
2227
2228         switch (ioctl) {
2229         case KVM_GET_MSR_INDEX_LIST: {
2230                 struct kvm_msr_list __user *user_msr_list = argp;
2231                 struct kvm_msr_list msr_list;
2232                 unsigned n;
2233
2234                 r = -EFAULT;
2235                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2236                         goto out;
2237                 n = msr_list.nmsrs;
2238                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2239                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2240                         goto out;
2241                 r = -E2BIG;
2242                 if (n < msr_list.nmsrs)
2243                         goto out;
2244                 r = -EFAULT;
2245                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2246                                  num_msrs_to_save * sizeof(u32)))
2247                         goto out;
2248                 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
2249                                  &emulated_msrs,
2250                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2251                         goto out;
2252                 r = 0;
2253                 break;
2254         }
2255         case KVM_GET_SUPPORTED_CPUID: {
2256                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2257                 struct kvm_cpuid2 cpuid;
2258
2259                 r = -EFAULT;
2260                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2261                         goto out;
2262                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
2263                                                       cpuid_arg->entries);
2264                 if (r)
2265                         goto out;
2266
2267                 r = -EFAULT;
2268                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2269                         goto out;
2270                 r = 0;
2271                 break;
2272         }
2273         case KVM_X86_GET_MCE_CAP_SUPPORTED: {
2274                 u64 mce_cap;
2275
2276                 mce_cap = KVM_MCE_CAP_SUPPORTED;
2277                 r = -EFAULT;
2278                 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
2279                         goto out;
2280                 r = 0;
2281                 break;
2282         }
2283         default:
2284                 r = -EINVAL;
2285         }
2286 out:
2287         return r;
2288 }
2289
2290 static void wbinvd_ipi(void *garbage)
2291 {
2292         wbinvd();
2293 }
2294
2295 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
2296 {
2297         return vcpu->kvm->arch.iommu_domain &&
2298                 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY);
2299 }
2300
2301 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2302 {
2303         /* Address WBINVD may be executed by guest */
2304         if (need_emulate_wbinvd(vcpu)) {
2305                 if (kvm_x86_ops->has_wbinvd_exit())
2306                         cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
2307                 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
2308                         smp_call_function_single(vcpu->cpu,
2309                                         wbinvd_ipi, NULL, 1);
2310         }
2311
2312         kvm_x86_ops->vcpu_load(vcpu, cpu);
2313
2314         /* Apply any externally detected TSC adjustments (due to suspend) */
2315         if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
2316                 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
2317                 vcpu->arch.tsc_offset_adjustment = 0;
2318                 set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
2319         }
2320
2321         if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
2322                 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
2323                                 native_read_tsc() - vcpu->arch.last_host_tsc;
2324                 if (tsc_delta < 0)
2325                         mark_tsc_unstable("KVM discovered backwards TSC");
2326                 if (check_tsc_unstable()) {
2327                         u64 offset = kvm_x86_ops->compute_tsc_offset(vcpu,
2328                                                 vcpu->arch.last_guest_tsc);
2329                         kvm_x86_ops->write_tsc_offset(vcpu, offset);
2330                         vcpu->arch.tsc_catchup = 1;
2331                 }
2332                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2333                 if (vcpu->cpu != cpu)
2334                         kvm_migrate_timers(vcpu);
2335                 vcpu->cpu = cpu;
2336         }
2337
2338         accumulate_steal_time(vcpu);
2339         kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
2340 }
2341
2342 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2343 {
2344         kvm_x86_ops->vcpu_put(vcpu);
2345         kvm_put_guest_fpu(vcpu);
2346         vcpu->arch.last_host_tsc = native_read_tsc();
2347 }
2348
2349 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2350                                     struct kvm_lapic_state *s)
2351 {
2352         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
2353
2354         return 0;
2355 }
2356
2357 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2358                                     struct kvm_lapic_state *s)
2359 {
2360         kvm_apic_post_state_restore(vcpu, s);
2361         update_cr8_intercept(vcpu);
2362
2363         return 0;
2364 }
2365
2366 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2367                                     struct kvm_interrupt *irq)
2368 {
2369         if (irq->irq < 0 || irq->irq >= KVM_NR_INTERRUPTS)
2370                 return -EINVAL;
2371         if (irqchip_in_kernel(vcpu->kvm))
2372                 return -ENXIO;
2373
2374         kvm_queue_interrupt(vcpu, irq->irq, false);
2375         kvm_make_request(KVM_REQ_EVENT, vcpu);
2376
2377         return 0;
2378 }
2379
2380 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
2381 {
2382         kvm_inject_nmi(vcpu);
2383
2384         return 0;
2385 }
2386
2387 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
2388                                            struct kvm_tpr_access_ctl *tac)
2389 {
2390         if (tac->flags)
2391                 return -EINVAL;
2392         vcpu->arch.tpr_access_reporting = !!tac->enabled;
2393         return 0;
2394 }
2395
2396 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
2397                                         u64 mcg_cap)
2398 {
2399         int r;
2400         unsigned bank_num = mcg_cap & 0xff, bank;
2401
2402         r = -EINVAL;
2403         if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
2404                 goto out;
2405         if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
2406                 goto out;
2407         r = 0;
2408         vcpu->arch.mcg_cap = mcg_cap;
2409         /* Init IA32_MCG_CTL to all 1s */
2410         if (mcg_cap & MCG_CTL_P)
2411                 vcpu->arch.mcg_ctl = ~(u64)0;
2412         /* Init IA32_MCi_CTL to all 1s */
2413         for (bank = 0; bank < bank_num; bank++)
2414                 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
2415 out:
2416         return r;
2417 }
2418
2419 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
2420                                       struct kvm_x86_mce *mce)
2421 {
2422         u64 mcg_cap = vcpu->arch.mcg_cap;
2423         unsigned bank_num = mcg_cap & 0xff;
2424         u64 *banks = vcpu->arch.mce_banks;
2425
2426         if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
2427                 return -EINVAL;
2428         /*
2429          * if IA32_MCG_CTL is not all 1s, the uncorrected error
2430          * reporting is disabled
2431          */
2432         if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
2433             vcpu->arch.mcg_ctl != ~(u64)0)
2434                 return 0;
2435         banks += 4 * mce->bank;
2436         /*
2437          * if IA32_MCi_CTL is not all 1s, the uncorrected error
2438          * reporting is disabled for the bank
2439          */
2440         if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
2441                 return 0;
2442         if (mce->status & MCI_STATUS_UC) {
2443                 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
2444                     !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
2445                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
2446                         return 0;
2447                 }
2448                 if (banks[1] & MCI_STATUS_VAL)
2449                         mce->status |= MCI_STATUS_OVER;
2450                 banks[2] = mce->addr;
2451                 banks[3] = mce->misc;
2452                 vcpu->arch.mcg_status = mce->mcg_status;
2453                 banks[1] = mce->status;
2454                 kvm_queue_exception(vcpu, MC_VECTOR);
2455         } else if (!(banks[1] & MCI_STATUS_VAL)
2456                    || !(banks[1] & MCI_STATUS_UC)) {
2457                 if (banks[1] & MCI_STATUS_VAL)
2458                         mce->status |= MCI_STATUS_OVER;
2459                 banks[2] = mce->addr;
2460                 banks[3] = mce->misc;
2461                 banks[1] = mce->status;
2462         } else
2463                 banks[1] |= MCI_STATUS_OVER;
2464         return 0;
2465 }
2466
2467 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
2468                                                struct kvm_vcpu_events *events)
2469 {
2470         process_nmi(vcpu);
2471         events->exception.injected =
2472                 vcpu->arch.exception.pending &&
2473                 !kvm_exception_is_soft(vcpu->arch.exception.nr);
2474         events->exception.nr = vcpu->arch.exception.nr;
2475         events->exception.has_error_code = vcpu->arch.exception.has_error_code;
2476         events->exception.pad = 0;
2477         events->exception.error_code = vcpu->arch.exception.error_code;
2478
2479         events->interrupt.injected =
2480                 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
2481         events->interrupt.nr = vcpu->arch.interrupt.nr;
2482         events->interrupt.soft = 0;
2483         events->interrupt.shadow =
2484                 kvm_x86_ops->get_interrupt_shadow(vcpu,
2485                         KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI);
2486
2487         events->nmi.injected = vcpu->arch.nmi_injected;
2488         events->nmi.pending = vcpu->arch.nmi_pending != 0;
2489         events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
2490         events->nmi.pad = 0;
2491
2492         events->sipi_vector = vcpu->arch.sipi_vector;
2493
2494         events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
2495                          | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2496                          | KVM_VCPUEVENT_VALID_SHADOW);
2497         memset(&events->reserved, 0, sizeof(events->reserved));
2498 }
2499
2500 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
2501                                               struct kvm_vcpu_events *events)
2502 {
2503         if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
2504                               | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2505                               | KVM_VCPUEVENT_VALID_SHADOW))
2506                 return -EINVAL;
2507
2508         process_nmi(vcpu);
2509         vcpu->arch.exception.pending = events->exception.injected;
2510         vcpu->arch.exception.nr = events->exception.nr;
2511         vcpu->arch.exception.has_error_code = events->exception.has_error_code;
2512         vcpu->arch.exception.error_code = events->exception.error_code;
2513
2514         vcpu->arch.interrupt.pending = events->interrupt.injected;
2515         vcpu->arch.interrupt.nr = events->interrupt.nr;
2516         vcpu->arch.interrupt.soft = events->interrupt.soft;
2517         if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
2518                 kvm_x86_ops->set_interrupt_shadow(vcpu,
2519                                                   events->interrupt.shadow);
2520
2521         vcpu->arch.nmi_injected = events->nmi.injected;
2522         if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
2523                 vcpu->arch.nmi_pending = events->nmi.pending;
2524         kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
2525
2526         if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR)
2527                 vcpu->arch.sipi_vector = events->sipi_vector;
2528
2529         kvm_make_request(KVM_REQ_EVENT, vcpu);
2530
2531         return 0;
2532 }
2533
2534 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
2535                                              struct kvm_debugregs *dbgregs)
2536 {
2537         memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
2538         dbgregs->dr6 = vcpu->arch.dr6;
2539         dbgregs->dr7 = vcpu->arch.dr7;
2540         dbgregs->flags = 0;
2541         memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
2542 }
2543
2544 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
2545                                             struct kvm_debugregs *dbgregs)
2546 {
2547         if (dbgregs->flags)
2548                 return -EINVAL;
2549
2550         memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
2551         vcpu->arch.dr6 = dbgregs->dr6;
2552         vcpu->arch.dr7 = dbgregs->dr7;
2553
2554         return 0;
2555 }
2556
2557 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
2558                                          struct kvm_xsave *guest_xsave)
2559 {
2560         if (cpu_has_xsave)
2561                 memcpy(guest_xsave->region,
2562                         &vcpu->arch.guest_fpu.state->xsave,
2563                         xstate_size);
2564         else {
2565                 memcpy(guest_xsave->region,
2566                         &vcpu->arch.guest_fpu.state->fxsave,
2567                         sizeof(struct i387_fxsave_struct));
2568                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
2569                         XSTATE_FPSSE;
2570         }
2571 }
2572
2573 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
2574                                         struct kvm_xsave *guest_xsave)
2575 {
2576         u64 xstate_bv =
2577                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
2578
2579         if (cpu_has_xsave)
2580                 memcpy(&vcpu->arch.guest_fpu.state->xsave,
2581                         guest_xsave->region, xstate_size);
2582         else {
2583                 if (xstate_bv & ~XSTATE_FPSSE)
2584                         return -EINVAL;
2585                 memcpy(&vcpu->arch.guest_fpu.state->fxsave,
2586                         guest_xsave->region, sizeof(struct i387_fxsave_struct));
2587         }
2588         return 0;
2589 }
2590
2591 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
2592                                         struct kvm_xcrs *guest_xcrs)
2593 {
2594         if (!cpu_has_xsave) {
2595                 guest_xcrs->nr_xcrs = 0;
2596                 return;
2597         }
2598
2599         guest_xcrs->nr_xcrs = 1;
2600         guest_xcrs->flags = 0;
2601         guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
2602         guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
2603 }
2604
2605 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
2606                                        struct kvm_xcrs *guest_xcrs)
2607 {
2608         int i, r = 0;
2609
2610         if (!cpu_has_xsave)
2611                 return -EINVAL;
2612
2613         if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
2614                 return -EINVAL;
2615
2616         for (i = 0; i < guest_xcrs->nr_xcrs; i++)
2617                 /* Only support XCR0 currently */
2618                 if (guest_xcrs->xcrs[0].xcr == XCR_XFEATURE_ENABLED_MASK) {
2619                         r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
2620                                 guest_xcrs->xcrs[0].value);
2621                         break;
2622                 }
2623         if (r)
2624                 r = -EINVAL;
2625         return r;
2626 }
2627
2628 /*
2629  * kvm_set_guest_paused() indicates to the guest kernel that it has been
2630  * stopped by the hypervisor.  This function will be called from the host only.
2631  * EINVAL is returned when the host attempts to set the flag for a guest that
2632  * does not support pv clocks.
2633  */
2634 static int kvm_set_guest_paused(struct kvm_vcpu *vcpu)
2635 {
2636         if (!vcpu->arch.time_page)
2637                 return -EINVAL;
2638         vcpu->arch.pvclock_set_guest_stopped_request = true;
2639         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2640         return 0;
2641 }
2642
2643 long kvm_arch_vcpu_ioctl(struct file *filp,
2644                          unsigned int ioctl, unsigned long arg)
2645 {
2646         struct kvm_vcpu *vcpu = filp->private_data;
2647         void __user *argp = (void __user *)arg;
2648         int r;
2649         union {
2650                 struct kvm_lapic_state *lapic;
2651                 struct kvm_xsave *xsave;
2652                 struct kvm_xcrs *xcrs;
2653                 void *buffer;
2654         } u;
2655
2656         u.buffer = NULL;
2657         switch (ioctl) {
2658         case KVM_GET_LAPIC: {
2659                 r = -EINVAL;
2660                 if (!vcpu->arch.apic)
2661                         goto out;
2662                 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2663
2664                 r = -ENOMEM;
2665                 if (!u.lapic)
2666                         goto out;
2667                 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
2668                 if (r)
2669                         goto out;
2670                 r = -EFAULT;
2671                 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
2672                         goto out;
2673                 r = 0;
2674                 break;
2675         }
2676         case KVM_SET_LAPIC: {
2677                 r = -EINVAL;
2678                 if (!vcpu->arch.apic)
2679                         goto out;
2680                 u.lapic = memdup_user(argp, sizeof(*u.lapic));
2681                 if (IS_ERR(u.lapic)) {
2682                         r = PTR_ERR(u.lapic);
2683                         goto out;
2684                 }
2685
2686                 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
2687                 if (r)
2688                         goto out;
2689                 r = 0;
2690                 break;
2691         }
2692         case KVM_INTERRUPT: {
2693                 struct kvm_interrupt irq;
2694
2695                 r = -EFAULT;
2696                 if (copy_from_user(&irq, argp, sizeof irq))
2697                         goto out;
2698                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2699                 if (r)
2700                         goto out;
2701                 r = 0;
2702                 break;
2703         }
2704         case KVM_NMI: {
2705                 r = kvm_vcpu_ioctl_nmi(vcpu);
2706                 if (r)
2707                         goto out;
2708                 r = 0;
2709                 break;
2710         }
2711         case KVM_SET_CPUID: {
2712                 struct kvm_cpuid __user *cpuid_arg = argp;
2713                 struct kvm_cpuid cpuid;
2714
2715                 r = -EFAULT;
2716                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2717                         goto out;
2718                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2719                 if (r)
2720                         goto out;
2721                 break;
2722         }
2723         case KVM_SET_CPUID2: {
2724                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2725                 struct kvm_cpuid2 cpuid;
2726
2727                 r = -EFAULT;
2728                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2729                         goto out;
2730                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
2731                                               cpuid_arg->entries);
2732                 if (r)
2733                         goto out;
2734                 break;
2735         }
2736         case KVM_GET_CPUID2: {
2737                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2738                 struct kvm_cpuid2 cpuid;
2739
2740                 r = -EFAULT;
2741                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2742                         goto out;
2743                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
2744                                               cpuid_arg->entries);
2745                 if (r)
2746                         goto out;
2747                 r = -EFAULT;
2748                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2749                         goto out;
2750                 r = 0;
2751                 break;
2752         }
2753         case KVM_GET_MSRS:
2754                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2755                 break;
2756         case KVM_SET_MSRS:
2757                 r = msr_io(vcpu, argp, do_set_msr, 0);
2758                 break;
2759         case KVM_TPR_ACCESS_REPORTING: {
2760                 struct kvm_tpr_access_ctl tac;
2761
2762                 r = -EFAULT;
2763                 if (copy_from_user(&tac, argp, sizeof tac))
2764                         goto out;
2765                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
2766                 if (r)
2767                         goto out;
2768                 r = -EFAULT;
2769                 if (copy_to_user(argp, &tac, sizeof tac))
2770                         goto out;
2771                 r = 0;
2772                 break;
2773         };
2774         case KVM_SET_VAPIC_ADDR: {
2775                 struct kvm_vapic_addr va;
2776
2777                 r = -EINVAL;
2778                 if (!irqchip_in_kernel(vcpu->kvm))
2779                         goto out;
2780                 r = -EFAULT;
2781                 if (copy_from_user(&va, argp, sizeof va))
2782                         goto out;
2783                 r = 0;
2784                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
2785                 break;
2786         }
2787         case KVM_X86_SETUP_MCE: {
2788                 u64 mcg_cap;
2789
2790                 r = -EFAULT;
2791                 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
2792                         goto out;
2793                 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
2794                 break;
2795         }
2796         case KVM_X86_SET_MCE: {
2797                 struct kvm_x86_mce mce;
2798
2799                 r = -EFAULT;
2800                 if (copy_from_user(&mce, argp, sizeof mce))
2801                         goto out;
2802                 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
2803                 break;
2804         }
2805         case KVM_GET_VCPU_EVENTS: {
2806                 struct kvm_vcpu_events events;
2807
2808                 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
2809
2810                 r = -EFAULT;
2811                 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
2812                         break;
2813                 r = 0;
2814                 break;
2815         }
2816         case KVM_SET_VCPU_EVENTS: {
2817                 struct kvm_vcpu_events events;
2818
2819                 r = -EFAULT;
2820                 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
2821                         break;
2822
2823                 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
2824                 break;
2825         }
2826         case KVM_GET_DEBUGREGS: {
2827                 struct kvm_debugregs dbgregs;
2828
2829                 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
2830
2831                 r = -EFAULT;
2832                 if (copy_to_user(argp, &dbgregs,
2833                                  sizeof(struct kvm_debugregs)))
2834                         break;
2835                 r = 0;
2836                 break;
2837         }
2838         case KVM_SET_DEBUGREGS: {
2839                 struct kvm_debugregs dbgregs;
2840
2841                 r = -EFAULT;
2842                 if (copy_from_user(&dbgregs, argp,
2843                                    sizeof(struct kvm_debugregs)))
2844                         break;
2845
2846                 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
2847                 break;
2848         }
2849         case KVM_GET_XSAVE: {
2850                 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
2851                 r = -ENOMEM;
2852                 if (!u.xsave)
2853                         break;
2854
2855                 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
2856
2857                 r = -EFAULT;
2858                 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
2859                         break;
2860                 r = 0;
2861                 break;
2862         }
2863         case KVM_SET_XSAVE: {
2864                 u.xsave = memdup_user(argp, sizeof(*u.xsave));
2865                 if (IS_ERR(u.xsave)) {
2866                         r = PTR_ERR(u.xsave);
2867                         goto out;
2868                 }
2869
2870                 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
2871                 break;
2872         }
2873         case KVM_GET_XCRS: {
2874                 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
2875                 r = -ENOMEM;
2876                 if (!u.xcrs)
2877                         break;
2878
2879                 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
2880
2881                 r = -EFAULT;
2882                 if (copy_to_user(argp, u.xcrs,
2883                                  sizeof(struct kvm_xcrs)))
2884                         break;
2885                 r = 0;
2886                 break;
2887         }
2888         case KVM_SET_XCRS: {
2889                 u.xcrs = memdup_user(argp, sizeof(*u.xcrs));
2890                 if (IS_ERR(u.xcrs)) {
2891                         r = PTR_ERR(u.xcrs);
2892                         goto out;
2893                 }
2894
2895                 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
2896                 break;
2897         }
2898         case KVM_SET_TSC_KHZ: {
2899                 u32 user_tsc_khz;
2900
2901                 r = -EINVAL;
2902                 user_tsc_khz = (u32)arg;
2903
2904                 if (user_tsc_khz >= kvm_max_guest_tsc_khz)
2905                         goto out;
2906
2907                 if (user_tsc_khz == 0)
2908                         user_tsc_khz = tsc_khz;
2909
2910                 kvm_set_tsc_khz(vcpu, user_tsc_khz);
2911
2912                 r = 0;
2913                 goto out;
2914         }
2915         case KVM_GET_TSC_KHZ: {
2916                 r = vcpu->arch.virtual_tsc_khz;
2917                 goto out;
2918         }
2919         case KVM_KVMCLOCK_CTRL: {
2920                 r = kvm_set_guest_paused(vcpu);
2921                 goto out;
2922         }
2923         default:
2924                 r = -EINVAL;
2925         }
2926 out:
2927         kfree(u.buffer);
2928         return r;
2929 }
2930
2931 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
2932 {
2933         return VM_FAULT_SIGBUS;
2934 }
2935
2936 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
2937 {
2938         int ret;
2939
2940         if (addr > (unsigned int)(-3 * PAGE_SIZE))
2941                 return -1;
2942         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
2943         return ret;
2944 }
2945
2946 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
2947                                               u64 ident_addr)
2948 {
2949         kvm->arch.ept_identity_map_addr = ident_addr;
2950         return 0;
2951 }
2952
2953 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
2954                                           u32 kvm_nr_mmu_pages)
2955 {
2956         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
2957                 return -EINVAL;
2958
2959         mutex_lock(&kvm->slots_lock);
2960         spin_lock(&kvm->mmu_lock);
2961
2962         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
2963         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
2964
2965         spin_unlock(&kvm->mmu_lock);
2966         mutex_unlock(&kvm->slots_lock);
2967         return 0;
2968 }
2969
2970 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
2971 {
2972         return kvm->arch.n_max_mmu_pages;
2973 }
2974
2975 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2976 {
2977         int r;
2978
2979         r = 0;
2980         switch (chip->chip_id) {
2981         case KVM_IRQCHIP_PIC_MASTER:
2982                 memcpy(&chip->chip.pic,
2983                         &pic_irqchip(kvm)->pics[0],
2984                         sizeof(struct kvm_pic_state));
2985                 break;
2986         case KVM_IRQCHIP_PIC_SLAVE:
2987                 memcpy(&chip->chip.pic,
2988                         &pic_irqchip(kvm)->pics[1],
2989                         sizeof(struct kvm_pic_state));
2990                 break;
2991         case KVM_IRQCHIP_IOAPIC:
2992                 r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
2993                 break;
2994         default:
2995                 r = -EINVAL;
2996                 break;
2997         }
2998         return r;
2999 }
3000
3001 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3002 {
3003         int r;
3004
3005         r = 0;
3006         switch (chip->chip_id) {
3007         case KVM_IRQCHIP_PIC_MASTER:
3008                 spin_lock(&pic_irqchip(kvm)->lock);
3009                 memcpy(&pic_irqchip(kvm)->pics[0],
3010                         &chip->chip.pic,
3011                         sizeof(struct kvm_pic_state));
3012                 spin_unlock(&pic_irqchip(kvm)->lock);
3013                 break;
3014         case KVM_IRQCHIP_PIC_SLAVE:
3015                 spin_lock(&pic_irqchip(kvm)->lock);
3016                 memcpy(&pic_irqchip(kvm)->pics[1],
3017                         &chip->chip.pic,
3018                         sizeof(struct kvm_pic_state));
3019                 spin_unlock(&pic_irqchip(kvm)->lock);
3020                 break;
3021         case KVM_IRQCHIP_IOAPIC:
3022                 r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
3023                 break;
3024         default:
3025                 r = -EINVAL;
3026                 break;
3027         }
3028         kvm_pic_update_irq(pic_irqchip(kvm));
3029         return r;
3030 }
3031
3032 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3033 {
3034         int r = 0;
3035
3036         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3037         memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
3038         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3039         return r;
3040 }
3041
3042 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3043 {
3044         int r = 0;
3045
3046         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3047         memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
3048         kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
3049         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3050         return r;
3051 }
3052
3053 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3054 {
3055         int r = 0;
3056
3057         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3058         memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
3059                 sizeof(ps->channels));
3060         ps->flags = kvm->arch.vpit->pit_state.flags;
3061         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3062         memset(&ps->reserved, 0, sizeof(ps->reserved));
3063         return r;
3064 }
3065
3066 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3067 {
3068         int r = 0, start = 0;
3069         u32 prev_legacy, cur_legacy;
3070         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3071         prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
3072         cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
3073         if (!prev_legacy && cur_legacy)
3074                 start = 1;
3075         memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
3076                sizeof(kvm->arch.vpit->pit_state.channels));
3077         kvm->arch.vpit->pit_state.flags = ps->flags;
3078         kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
3079         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3080         return r;
3081 }
3082
3083 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
3084                                  struct kvm_reinject_control *control)
3085 {
3086         if (!kvm->arch.vpit)
3087                 return -ENXIO;
3088         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3089         kvm->arch.vpit->pit_state.reinject = control->pit_reinject;
3090         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3091         return 0;
3092 }
3093
3094 /**
3095  * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
3096  * @kvm: kvm instance
3097  * @log: slot id and address to which we copy the log
3098  *
3099  * We need to keep it in mind that VCPU threads can write to the bitmap
3100  * concurrently.  So, to avoid losing data, we keep the following order for
3101  * each bit:
3102  *
3103  *   1. Take a snapshot of the bit and clear it if needed.
3104  *   2. Write protect the corresponding page.
3105  *   3. Flush TLB's if needed.
3106  *   4. Copy the snapshot to the userspace.
3107  *
3108  * Between 2 and 3, the guest may write to the page using the remaining TLB
3109  * entry.  This is not a problem because the page will be reported dirty at
3110  * step 4 using the snapshot taken before and step 3 ensures that successive
3111  * writes will be logged for the next call.
3112  */
3113 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
3114 {
3115         int r;
3116         struct kvm_memory_slot *memslot;
3117         unsigned long n, i;
3118         unsigned long *dirty_bitmap;
3119         unsigned long *dirty_bitmap_buffer;
3120         bool is_dirty = false;
3121
3122         mutex_lock(&kvm->slots_lock);
3123
3124         r = -EINVAL;
3125         if (log->slot >= KVM_MEMORY_SLOTS)
3126                 goto out;
3127
3128         memslot = id_to_memslot(kvm->memslots, log->slot);
3129
3130         dirty_bitmap = memslot->dirty_bitmap;
3131         r = -ENOENT;
3132         if (!dirty_bitmap)
3133                 goto out;
3134
3135         n = kvm_dirty_bitmap_bytes(memslot);
3136
3137         dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
3138         memset(dirty_bitmap_buffer, 0, n);
3139
3140         spin_lock(&kvm->mmu_lock);
3141
3142         for (i = 0; i < n / sizeof(long); i++) {
3143                 unsigned long mask;
3144                 gfn_t offset;
3145
3146                 if (!dirty_bitmap[i])
3147                         continue;
3148
3149                 is_dirty = true;
3150
3151                 mask = xchg(&dirty_bitmap[i], 0);
3152                 dirty_bitmap_buffer[i] = mask;
3153
3154                 offset = i * BITS_PER_LONG;
3155                 kvm_mmu_write_protect_pt_masked(kvm, memslot, offset, mask);
3156         }
3157         if (is_dirty)
3158                 kvm_flush_remote_tlbs(kvm);
3159
3160         spin_unlock(&kvm->mmu_lock);
3161
3162         r = -EFAULT;
3163         if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
3164                 goto out;
3165
3166         r = 0;
3167 out:
3168         mutex_unlock(&kvm->slots_lock);
3169         return r;
3170 }
3171
3172 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event)
3173 {
3174         if (!irqchip_in_kernel(kvm))
3175                 return -ENXIO;
3176
3177         irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
3178                                         irq_event->irq, irq_event->level);
3179         return 0;
3180 }
3181
3182 long kvm_arch_vm_ioctl(struct file *filp,
3183                        unsigned int ioctl, unsigned long arg)
3184 {
3185         struct kvm *kvm = filp->private_data;
3186         void __user *argp = (void __user *)arg;
3187         int r = -ENOTTY;
3188         /*
3189          * This union makes it completely explicit to gcc-3.x
3190          * that these two variables' stack usage should be
3191          * combined, not added together.
3192          */
3193         union {
3194                 struct kvm_pit_state ps;
3195                 struct kvm_pit_state2 ps2;
3196                 struct kvm_pit_config pit_config;
3197         } u;
3198
3199         switch (ioctl) {
3200         case KVM_SET_TSS_ADDR:
3201                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
3202                 if (r < 0)
3203                         goto out;
3204                 break;
3205         case KVM_SET_IDENTITY_MAP_ADDR: {
3206                 u64 ident_addr;
3207
3208                 r = -EFAULT;
3209                 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
3210                         goto out;
3211                 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
3212                 if (r < 0)
3213                         goto out;
3214                 break;
3215         }
3216         case KVM_SET_NR_MMU_PAGES:
3217                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
3218                 if (r)
3219                         goto out;
3220                 break;
3221         case KVM_GET_NR_MMU_PAGES:
3222                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
3223                 break;
3224         case KVM_CREATE_IRQCHIP: {
3225                 struct kvm_pic *vpic;
3226
3227                 mutex_lock(&kvm->lock);
3228                 r = -EEXIST;
3229                 if (kvm->arch.vpic)
3230                         goto create_irqchip_unlock;
3231                 r = -EINVAL;
3232                 if (atomic_read(&kvm->online_vcpus))
3233                         goto create_irqchip_unlock;
3234                 r = -ENOMEM;
3235                 vpic = kvm_create_pic(kvm);
3236                 if (vpic) {
3237                         r = kvm_ioapic_init(kvm);
3238                         if (r) {
3239                                 mutex_lock(&kvm->slots_lock);
3240                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3241                                                           &vpic->dev_master);
3242                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3243                                                           &vpic->dev_slave);
3244                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3245                                                           &vpic->dev_eclr);
3246                                 mutex_unlock(&kvm->slots_lock);
3247                                 kfree(vpic);
3248                                 goto create_irqchip_unlock;
3249                         }
3250                 } else
3251                         goto create_irqchip_unlock;
3252                 smp_wmb();
3253                 kvm->arch.vpic = vpic;
3254                 smp_wmb();
3255                 r = kvm_setup_default_irq_routing(kvm);
3256                 if (r) {
3257                         mutex_lock(&kvm->slots_lock);
3258                         mutex_lock(&kvm->irq_lock);
3259                         kvm_ioapic_destroy(kvm);
3260                         kvm_destroy_pic(kvm);
3261                         mutex_unlock(&kvm->irq_lock);
3262                         mutex_unlock(&kvm->slots_lock);
3263                 }
3264         create_irqchip_unlock:
3265                 mutex_unlock(&kvm->lock);
3266                 break;
3267         }
3268         case KVM_CREATE_PIT:
3269                 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
3270                 goto create_pit;
3271         case KVM_CREATE_PIT2:
3272                 r = -EFAULT;
3273                 if (copy_from_user(&u.pit_config, argp,
3274                                    sizeof(struct kvm_pit_config)))
3275                         goto out;
3276         create_pit:
3277                 mutex_lock(&kvm->slots_lock);
3278                 r = -EEXIST;
3279                 if (kvm->arch.vpit)
3280                         goto create_pit_unlock;
3281                 r = -ENOMEM;
3282                 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
3283                 if (kvm->arch.vpit)
3284                         r = 0;
3285         create_pit_unlock:
3286                 mutex_unlock(&kvm->slots_lock);
3287                 break;
3288         case KVM_GET_IRQCHIP: {
3289                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3290                 struct kvm_irqchip *chip;
3291
3292                 chip = memdup_user(argp, sizeof(*chip));
3293                 if (IS_ERR(chip)) {
3294                         r = PTR_ERR(chip);
3295                         goto out;
3296                 }
3297
3298                 r = -ENXIO;
3299                 if (!irqchip_in_kernel(kvm))
3300                         goto get_irqchip_out;
3301                 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
3302                 if (r)
3303                         goto get_irqchip_out;
3304                 r = -EFAULT;
3305                 if (copy_to_user(argp, chip, sizeof *chip))
3306                         goto get_irqchip_out;
3307                 r = 0;
3308         get_irqchip_out:
3309                 kfree(chip);
3310                 if (r)
3311                         goto out;
3312                 break;
3313         }
3314         case KVM_SET_IRQCHIP: {
3315                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3316                 struct kvm_irqchip *chip;
3317
3318                 chip = memdup_user(argp, sizeof(*chip));
3319                 if (IS_ERR(chip)) {
3320                         r = PTR_ERR(chip);
3321                         goto out;
3322                 }
3323
3324                 r = -ENXIO;
3325                 if (!irqchip_in_kernel(kvm))
3326                         goto set_irqchip_out;
3327                 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
3328                 if (r)
3329                         goto set_irqchip_out;
3330                 r = 0;
3331         set_irqchip_out:
3332                 kfree(chip);
3333                 if (r)
3334                         goto out;
3335                 break;
3336         }
3337         case KVM_GET_PIT: {
3338                 r = -EFAULT;
3339                 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
3340                         goto out;
3341                 r = -ENXIO;
3342                 if (!kvm->arch.vpit)
3343                         goto out;
3344                 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
3345                 if (r)
3346                         goto out;
3347                 r = -EFAULT;
3348                 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
3349                         goto out;
3350                 r = 0;
3351                 break;
3352         }
3353         case KVM_SET_PIT: {
3354                 r = -EFAULT;
3355                 if (copy_from_user(&u.ps, argp, sizeof u.ps))
3356                         goto out;
3357                 r = -ENXIO;
3358                 if (!kvm->arch.vpit)
3359                         goto out;
3360                 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
3361                 if (r)
3362                         goto out;
3363                 r = 0;
3364                 break;
3365         }
3366         case KVM_GET_PIT2: {
3367                 r = -ENXIO;
3368                 if (!kvm->arch.vpit)
3369                         goto out;
3370                 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
3371                 if (r)
3372                         goto out;
3373                 r = -EFAULT;
3374                 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
3375                         goto out;
3376                 r = 0;
3377                 break;
3378         }
3379         case KVM_SET_PIT2: {
3380                 r = -EFAULT;
3381                 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
3382                         goto out;
3383                 r = -ENXIO;
3384                 if (!kvm->arch.vpit)
3385                         goto out;
3386                 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
3387                 if (r)
3388                         goto out;
3389                 r = 0;
3390                 break;
3391         }
3392         case KVM_REINJECT_CONTROL: {
3393                 struct kvm_reinject_control control;
3394                 r =  -EFAULT;
3395                 if (copy_from_user(&control, argp, sizeof(control)))
3396                         goto out;
3397                 r = kvm_vm_ioctl_reinject(kvm, &control);
3398                 if (r)
3399                         goto out;
3400                 r = 0;
3401                 break;
3402         }
3403         case KVM_XEN_HVM_CONFIG: {
3404                 r = -EFAULT;
3405                 if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
3406                                    sizeof(struct kvm_xen_hvm_config)))
3407                         goto out;
3408                 r = -EINVAL;
3409                 if (kvm->arch.xen_hvm_config.flags)
3410                         goto out;
3411                 r = 0;
3412                 break;
3413         }
3414         case KVM_SET_CLOCK: {
3415                 struct kvm_clock_data user_ns;
3416                 u64 now_ns;
3417                 s64 delta;
3418
3419                 r = -EFAULT;
3420                 if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
3421                         goto out;
3422
3423                 r = -EINVAL;
3424                 if (user_ns.flags)
3425                         goto out;
3426
3427                 r = 0;
3428                 local_irq_disable();
3429                 now_ns = get_kernel_ns();
3430                 delta = user_ns.clock - now_ns;
3431                 local_irq_enable();
3432                 kvm->arch.kvmclock_offset = delta;
3433                 break;
3434         }
3435         case KVM_GET_CLOCK: {
3436                 struct kvm_clock_data user_ns;
3437                 u64 now_ns;
3438
3439                 local_irq_disable();
3440                 now_ns = get_kernel_ns();
3441                 user_ns.clock = kvm->arch.kvmclock_offset + now_ns;
3442                 local_irq_enable();
3443                 user_ns.flags = 0;
3444                 memset(&user_ns.pad, 0, sizeof(user_ns.pad));
3445
3446                 r = -EFAULT;
3447                 if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
3448                         goto out;
3449                 r = 0;
3450                 break;
3451         }
3452
3453         default:
3454                 ;
3455         }
3456 out:
3457         return r;
3458 }
3459
3460 static void kvm_init_msr_list(void)
3461 {
3462         u32 dummy[2];
3463         unsigned i, j;
3464
3465         /* skip the first msrs in the list. KVM-specific */
3466         for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) {
3467                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
3468                         continue;
3469                 if (j < i)
3470                         msrs_to_save[j] = msrs_to_save[i];
3471                 j++;
3472         }
3473         num_msrs_to_save = j;
3474 }
3475
3476 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
3477                            const void *v)
3478 {
3479         int handled = 0;
3480         int n;
3481
3482         do {
3483                 n = min(len, 8);
3484                 if (!(vcpu->arch.apic &&
3485                       !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, n, v))
3486                     && kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
3487                         break;
3488                 handled += n;
3489                 addr += n;
3490                 len -= n;
3491                 v += n;
3492         } while (len);
3493
3494         return handled;
3495 }
3496
3497 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
3498 {
3499         int handled = 0;
3500         int n;
3501
3502         do {
3503                 n = min(len, 8);
3504                 if (!(vcpu->arch.apic &&
3505                       !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, n, v))
3506                     && kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
3507                         break;
3508                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v);
3509                 handled += n;
3510                 addr += n;
3511                 len -= n;
3512                 v += n;
3513         } while (len);
3514
3515         return handled;
3516 }
3517
3518 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3519                         struct kvm_segment *var, int seg)
3520 {
3521         kvm_x86_ops->set_segment(vcpu, var, seg);
3522 }
3523
3524 void kvm_get_segment(struct kvm_vcpu *vcpu,
3525                      struct kvm_segment *var, int seg)
3526 {
3527         kvm_x86_ops->get_segment(vcpu, var, seg);
3528 }
3529
3530 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
3531 {
3532         gpa_t t_gpa;
3533         struct x86_exception exception;
3534
3535         BUG_ON(!mmu_is_nested(vcpu));
3536
3537         /* NPT walks are always user-walks */
3538         access |= PFERR_USER_MASK;
3539         t_gpa  = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, &exception);
3540
3541         return t_gpa;
3542 }
3543
3544 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
3545                               struct x86_exception *exception)
3546 {
3547         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3548         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3549 }
3550
3551  gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
3552                                 struct x86_exception *exception)
3553 {
3554         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3555         access |= PFERR_FETCH_MASK;
3556         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3557 }
3558
3559 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
3560                                struct x86_exception *exception)
3561 {
3562         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3563         access |= PFERR_WRITE_MASK;
3564         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3565 }
3566
3567 /* uses this to access any guest's mapped memory without checking CPL */
3568 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
3569                                 struct x86_exception *exception)
3570 {
3571         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception);
3572 }
3573
3574 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
3575                                       struct kvm_vcpu *vcpu, u32 access,
3576                                       struct x86_exception *exception)
3577 {
3578         void *data = val;
3579         int r = X86EMUL_CONTINUE;
3580
3581         while (bytes) {
3582                 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
3583                                                             exception);
3584                 unsigned offset = addr & (PAGE_SIZE-1);
3585                 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
3586                 int ret;
3587
3588                 if (gpa == UNMAPPED_GVA)
3589                         return X86EMUL_PROPAGATE_FAULT;
3590                 ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
3591                 if (ret < 0) {
3592                         r = X86EMUL_IO_NEEDED;
3593                         goto out;
3594                 }
3595
3596                 bytes -= toread;
3597                 data += toread;
3598                 addr += toread;
3599         }
3600 out:
3601         return r;
3602 }
3603
3604 /* used for instruction fetching */
3605 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
3606                                 gva_t addr, void *val, unsigned int bytes,
3607                                 struct x86_exception *exception)
3608 {
3609         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3610         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3611
3612         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu,
3613                                           access | PFERR_FETCH_MASK,
3614                                           exception);
3615 }
3616
3617 int kvm_read_guest_virt(struct x86_emulate_ctxt *ctxt,
3618                                gva_t addr, void *val, unsigned int bytes,
3619                                struct x86_exception *exception)
3620 {
3621         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3622         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3623
3624         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
3625                                           exception);
3626 }
3627 EXPORT_SYMBOL_GPL(kvm_read_guest_virt);
3628
3629 static int kvm_read_guest_virt_system(struct x86_emulate_ctxt *ctxt,
3630                                       gva_t addr, void *val, unsigned int bytes,
3631                                       struct x86_exception *exception)
3632 {
3633         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3634         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
3635 }
3636
3637 int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
3638                                        gva_t addr, void *val,
3639                                        unsigned int bytes,
3640                                        struct x86_exception *exception)
3641 {
3642         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3643         void *data = val;
3644         int r = X86EMUL_CONTINUE;
3645
3646         while (bytes) {
3647                 gpa_t gpa =  vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
3648                                                              PFERR_WRITE_MASK,
3649                                                              exception);
3650                 unsigned offset = addr & (PAGE_SIZE-1);
3651                 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
3652                 int ret;
3653
3654                 if (gpa == UNMAPPED_GVA)
3655                         return X86EMUL_PROPAGATE_FAULT;
3656                 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
3657                 if (ret < 0) {
3658                         r = X86EMUL_IO_NEEDED;
3659                         goto out;
3660                 }
3661
3662                 bytes -= towrite;
3663                 data += towrite;
3664                 addr += towrite;
3665         }
3666 out:
3667         return r;
3668 }
3669 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
3670
3671 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
3672                                 gpa_t *gpa, struct x86_exception *exception,
3673                                 bool write)
3674 {
3675         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3676
3677         if (vcpu_match_mmio_gva(vcpu, gva) &&
3678                   check_write_user_access(vcpu, write, access,
3679                   vcpu->arch.access)) {
3680                 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
3681                                         (gva & (PAGE_SIZE - 1));
3682                 trace_vcpu_match_mmio(gva, *gpa, write, false);
3683                 return 1;
3684         }
3685
3686         if (write)
3687                 access |= PFERR_WRITE_MASK;
3688
3689         *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3690
3691         if (*gpa == UNMAPPED_GVA)
3692                 return -1;
3693
3694         /* For APIC access vmexit */
3695         if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3696                 return 1;
3697
3698         if (vcpu_match_mmio_gpa(vcpu, *gpa)) {
3699                 trace_vcpu_match_mmio(gva, *gpa, write, true);
3700                 return 1;
3701         }
3702
3703         return 0;
3704 }
3705
3706 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
3707                         const void *val, int bytes)
3708 {
3709         int ret;
3710
3711         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
3712         if (ret < 0)
3713                 return 0;
3714         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
3715         return 1;
3716 }
3717
3718 struct read_write_emulator_ops {
3719         int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val,
3720                                   int bytes);
3721         int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa,
3722                                   void *val, int bytes);
3723         int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
3724                                int bytes, void *val);
3725         int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
3726                                     void *val, int bytes);
3727         bool write;
3728 };
3729
3730 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
3731 {
3732         if (vcpu->mmio_read_completed) {
3733                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
3734                                vcpu->mmio_fragments[0].gpa, *(u64 *)val);
3735                 vcpu->mmio_read_completed = 0;
3736                 return 1;
3737         }
3738
3739         return 0;
3740 }
3741
3742 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
3743                         void *val, int bytes)
3744 {
3745         return !kvm_read_guest(vcpu->kvm, gpa, val, bytes);
3746 }
3747
3748 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
3749                          void *val, int bytes)
3750 {
3751         return emulator_write_phys(vcpu, gpa, val, bytes);
3752 }
3753
3754 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
3755 {
3756         trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
3757         return vcpu_mmio_write(vcpu, gpa, bytes, val);
3758 }
3759
3760 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
3761                           void *val, int bytes)
3762 {
3763         trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
3764         return X86EMUL_IO_NEEDED;
3765 }
3766
3767 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
3768                            void *val, int bytes)
3769 {
3770         struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0];
3771
3772         memcpy(vcpu->run->mmio.data, frag->data, frag->len);
3773         return X86EMUL_CONTINUE;
3774 }
3775
3776 static const struct read_write_emulator_ops read_emultor = {
3777         .read_write_prepare = read_prepare,
3778         .read_write_emulate = read_emulate,
3779         .read_write_mmio = vcpu_mmio_read,
3780         .read_write_exit_mmio = read_exit_mmio,
3781 };
3782
3783 static const struct read_write_emulator_ops write_emultor = {
3784         .read_write_emulate = write_emulate,
3785         .read_write_mmio = write_mmio,
3786         .read_write_exit_mmio = write_exit_mmio,
3787         .write = true,
3788 };
3789
3790 static int emulator_read_write_onepage(unsigned long addr, void *val,
3791                                        unsigned int bytes,
3792                                        struct x86_exception *exception,
3793                                        struct kvm_vcpu *vcpu,
3794                                        const struct read_write_emulator_ops *ops)
3795 {
3796         gpa_t gpa;
3797         int handled, ret;
3798         bool write = ops->write;
3799         struct kvm_mmio_fragment *frag;
3800
3801         ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
3802
3803         if (ret < 0)
3804                 return X86EMUL_PROPAGATE_FAULT;
3805
3806         /* For APIC access vmexit */
3807         if (ret)
3808                 goto mmio;
3809
3810         if (ops->read_write_emulate(vcpu, gpa, val, bytes))
3811                 return X86EMUL_CONTINUE;
3812
3813 mmio:
3814         /*
3815          * Is this MMIO handled locally?
3816          */
3817         handled = ops->read_write_mmio(vcpu, gpa, bytes, val);
3818         if (handled == bytes)
3819                 return X86EMUL_CONTINUE;
3820
3821         gpa += handled;
3822         bytes -= handled;
3823         val += handled;
3824
3825         while (bytes) {
3826                 unsigned now = min(bytes, 8U);
3827
3828                 frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++];
3829                 frag->gpa = gpa;
3830                 frag->data = val;
3831                 frag->len = now;
3832
3833                 gpa += now;
3834                 val += now;
3835                 bytes -= now;
3836         }
3837         return X86EMUL_CONTINUE;
3838 }
3839
3840 int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr,
3841                         void *val, unsigned int bytes,
3842                         struct x86_exception *exception,
3843                         const struct read_write_emulator_ops *ops)
3844 {
3845         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3846         gpa_t gpa;
3847         int rc;
3848
3849         if (ops->read_write_prepare &&
3850                   ops->read_write_prepare(vcpu, val, bytes))
3851                 return X86EMUL_CONTINUE;
3852
3853         vcpu->mmio_nr_fragments = 0;
3854
3855         /* Crossing a page boundary? */
3856         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
3857                 int now;
3858
3859                 now = -addr & ~PAGE_MASK;
3860                 rc = emulator_read_write_onepage(addr, val, now, exception,
3861                                                  vcpu, ops);
3862
3863                 if (rc != X86EMUL_CONTINUE)
3864                         return rc;
3865                 addr += now;
3866                 val += now;
3867                 bytes -= now;
3868         }
3869
3870         rc = emulator_read_write_onepage(addr, val, bytes, exception,
3871                                          vcpu, ops);
3872         if (rc != X86EMUL_CONTINUE)
3873                 return rc;
3874
3875         if (!vcpu->mmio_nr_fragments)
3876                 return rc;
3877
3878         gpa = vcpu->mmio_fragments[0].gpa;
3879
3880         vcpu->mmio_needed = 1;
3881         vcpu->mmio_cur_fragment = 0;
3882
3883         vcpu->run->mmio.len = vcpu->mmio_fragments[0].len;
3884         vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write;
3885         vcpu->run->exit_reason = KVM_EXIT_MMIO;
3886         vcpu->run->mmio.phys_addr = gpa;
3887
3888         return ops->read_write_exit_mmio(vcpu, gpa, val, bytes);
3889 }
3890
3891 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
3892                                   unsigned long addr,
3893                                   void *val,
3894                                   unsigned int bytes,
3895                                   struct x86_exception *exception)
3896 {
3897         return emulator_read_write(ctxt, addr, val, bytes,
3898                                    exception, &read_emultor);
3899 }
3900
3901 int emulator_write_emulated(struct x86_emulate_ctxt *ctxt,
3902                             unsigned long addr,
3903                             const void *val,
3904                             unsigned int bytes,
3905                             struct x86_exception *exception)
3906 {
3907         return emulator_read_write(ctxt, addr, (void *)val, bytes,
3908                                    exception, &write_emultor);
3909 }
3910
3911 #define CMPXCHG_TYPE(t, ptr, old, new) \
3912         (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
3913
3914 #ifdef CONFIG_X86_64
3915 #  define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
3916 #else
3917 #  define CMPXCHG64(ptr, old, new) \
3918         (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
3919 #endif
3920
3921 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
3922                                      unsigned long addr,
3923                                      const void *old,
3924                                      const void *new,
3925                                      unsigned int bytes,
3926                                      struct x86_exception *exception)
3927 {
3928         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3929         gpa_t gpa;
3930         struct page *page;
3931         char *kaddr;
3932         bool exchanged;
3933
3934         /* guests cmpxchg8b have to be emulated atomically */
3935         if (bytes > 8 || (bytes & (bytes - 1)))
3936                 goto emul_write;
3937
3938         gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
3939
3940         if (gpa == UNMAPPED_GVA ||
3941             (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3942                 goto emul_write;
3943
3944         if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
3945                 goto emul_write;
3946
3947         page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
3948         if (is_error_page(page))
3949                 goto emul_write;
3950
3951         kaddr = kmap_atomic(page);
3952         kaddr += offset_in_page(gpa);
3953         switch (bytes) {
3954         case 1:
3955                 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
3956                 break;
3957         case 2:
3958                 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
3959                 break;
3960         case 4:
3961                 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
3962                 break;
3963         case 8:
3964                 exchanged = CMPXCHG64(kaddr, old, new);
3965                 break;
3966         default:
3967                 BUG();
3968         }
3969         kunmap_atomic(kaddr);
3970         kvm_release_page_dirty(page);
3971
3972         if (!exchanged)
3973                 return X86EMUL_CMPXCHG_FAILED;
3974
3975         kvm_mmu_pte_write(vcpu, gpa, new, bytes);
3976
3977         return X86EMUL_CONTINUE;
3978
3979 emul_write:
3980         printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
3981
3982         return emulator_write_emulated(ctxt, addr, new, bytes, exception);
3983 }
3984
3985 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
3986 {
3987         /* TODO: String I/O for in kernel device */
3988         int r;
3989
3990         if (vcpu->arch.pio.in)
3991                 r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port,
3992                                     vcpu->arch.pio.size, pd);
3993         else
3994                 r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS,
3995                                      vcpu->arch.pio.port, vcpu->arch.pio.size,
3996                                      pd);
3997         return r;
3998 }
3999
4000 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
4001                                unsigned short port, void *val,
4002                                unsigned int count, bool in)
4003 {
4004         trace_kvm_pio(!in, port, size, count);
4005
4006         vcpu->arch.pio.port = port;
4007         vcpu->arch.pio.in = in;
4008         vcpu->arch.pio.count  = count;
4009         vcpu->arch.pio.size = size;
4010
4011         if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
4012                 vcpu->arch.pio.count = 0;
4013                 return 1;
4014         }
4015
4016         vcpu->run->exit_reason = KVM_EXIT_IO;
4017         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
4018         vcpu->run->io.size = size;
4019         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
4020         vcpu->run->io.count = count;
4021         vcpu->run->io.port = port;
4022
4023         return 0;
4024 }
4025
4026 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
4027                                     int size, unsigned short port, void *val,
4028                                     unsigned int count)
4029 {
4030         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4031         int ret;
4032
4033         if (vcpu->arch.pio.count)
4034                 goto data_avail;
4035
4036         ret = emulator_pio_in_out(vcpu, size, port, val, count, true);
4037         if (ret) {
4038 data_avail:
4039                 memcpy(val, vcpu->arch.pio_data, size * count);
4040                 vcpu->arch.pio.count = 0;
4041                 return 1;
4042         }
4043
4044         return 0;
4045 }
4046
4047 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,
4048                                      int size, unsigned short port,
4049                                      const void *val, unsigned int count)
4050 {
4051         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4052
4053         memcpy(vcpu->arch.pio_data, val, size * count);
4054         return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
4055 }
4056
4057 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
4058 {
4059         return kvm_x86_ops->get_segment_base(vcpu, seg);
4060 }
4061
4062 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address)
4063 {
4064         kvm_mmu_invlpg(emul_to_vcpu(ctxt), address);
4065 }
4066
4067 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
4068 {
4069         if (!need_emulate_wbinvd(vcpu))
4070                 return X86EMUL_CONTINUE;
4071
4072         if (kvm_x86_ops->has_wbinvd_exit()) {
4073                 int cpu = get_cpu();
4074
4075                 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
4076                 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
4077                                 wbinvd_ipi, NULL, 1);
4078                 put_cpu();
4079                 cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
4080         } else
4081                 wbinvd();
4082         return X86EMUL_CONTINUE;
4083 }
4084 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
4085
4086 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt)
4087 {
4088         kvm_emulate_wbinvd(emul_to_vcpu(ctxt));
4089 }
4090
4091 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
4092 {
4093         return _kvm_get_dr(emul_to_vcpu(ctxt), dr, dest);
4094 }
4095
4096 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
4097 {
4098
4099         return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value);
4100 }
4101
4102 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
4103 {
4104         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
4105 }
4106
4107 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr)
4108 {
4109         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4110         unsigned long value;
4111
4112         switch (cr) {
4113         case 0:
4114                 value = kvm_read_cr0(vcpu);
4115                 break;
4116         case 2:
4117                 value = vcpu->arch.cr2;
4118                 break;
4119         case 3:
4120                 value = kvm_read_cr3(vcpu);
4121                 break;
4122         case 4:
4123                 value = kvm_read_cr4(vcpu);
4124                 break;
4125         case 8:
4126                 value = kvm_get_cr8(vcpu);
4127                 break;
4128         default:
4129                 kvm_err("%s: unexpected cr %u\n", __func__, cr);
4130                 return 0;
4131         }
4132
4133         return value;
4134 }
4135
4136 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val)
4137 {
4138         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4139         int res = 0;
4140
4141         switch (cr) {
4142         case 0:
4143                 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
4144                 break;
4145         case 2:
4146                 vcpu->arch.cr2 = val;
4147                 break;
4148         case 3:
4149                 res = kvm_set_cr3(vcpu, val);
4150                 break;
4151         case 4:
4152                 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
4153                 break;
4154         case 8:
4155                 res = kvm_set_cr8(vcpu, val);
4156                 break;
4157         default:
4158                 kvm_err("%s: unexpected cr %u\n", __func__, cr);
4159                 res = -1;
4160         }
4161
4162         return res;
4163 }
4164
4165 static void emulator_set_rflags(struct x86_emulate_ctxt *ctxt, ulong val)
4166 {
4167         kvm_set_rflags(emul_to_vcpu(ctxt), val);
4168 }
4169
4170 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt)
4171 {
4172         return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt));
4173 }
4174
4175 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4176 {
4177         kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt);
4178 }
4179
4180 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4181 {
4182         kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt);
4183 }
4184
4185 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4186 {
4187         kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt);
4188 }
4189
4190 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4191 {
4192         kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt);
4193 }
4194
4195 static unsigned long emulator_get_cached_segment_base(
4196         struct x86_emulate_ctxt *ctxt, int seg)
4197 {
4198         return get_segment_base(emul_to_vcpu(ctxt), seg);
4199 }
4200
4201 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
4202                                  struct desc_struct *desc, u32 *base3,
4203                                  int seg)
4204 {
4205         struct kvm_segment var;
4206
4207         kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
4208         *selector = var.selector;
4209
4210         if (var.unusable)
4211                 return false;
4212
4213         if (var.g)
4214                 var.limit >>= 12;
4215         set_desc_limit(desc, var.limit);
4216         set_desc_base(desc, (unsigned long)var.base);
4217 #ifdef CONFIG_X86_64
4218         if (base3)
4219                 *base3 = var.base >> 32;
4220 #endif
4221         desc->type = var.type;
4222         desc->s = var.s;
4223         desc->dpl = var.dpl;
4224         desc->p = var.present;
4225         desc->avl = var.avl;
4226         desc->l = var.l;
4227         desc->d = var.db;
4228         desc->g = var.g;
4229
4230         return true;
4231 }
4232
4233 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
4234                                  struct desc_struct *desc, u32 base3,
4235                                  int seg)
4236 {
4237         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4238         struct kvm_segment var;
4239
4240         var.selector = selector;
4241         var.base = get_desc_base(desc);
4242 #ifdef CONFIG_X86_64
4243         var.base |= ((u64)base3) << 32;
4244 #endif
4245         var.limit = get_desc_limit(desc);
4246         if (desc->g)
4247                 var.limit = (var.limit << 12) | 0xfff;
4248         var.type = desc->type;
4249         var.present = desc->p;
4250         var.dpl = desc->dpl;
4251         var.db = desc->d;
4252         var.s = desc->s;
4253         var.l = desc->l;
4254         var.g = desc->g;
4255         var.avl = desc->avl;
4256         var.present = desc->p;
4257         var.unusable = !var.present;
4258         var.padding = 0;
4259
4260         kvm_set_segment(vcpu, &var, seg);
4261         return;
4262 }
4263
4264 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
4265                             u32 msr_index, u64 *pdata)
4266 {
4267         return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
4268 }
4269
4270 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
4271                             u32 msr_index, u64 data)
4272 {
4273         return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data);
4274 }
4275
4276 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt,
4277                              u32 pmc, u64 *pdata)
4278 {
4279         return kvm_pmu_read_pmc(emul_to_vcpu(ctxt), pmc, pdata);
4280 }
4281
4282 static void emulator_halt(struct x86_emulate_ctxt *ctxt)
4283 {
4284         emul_to_vcpu(ctxt)->arch.halt_request = 1;
4285 }
4286
4287 static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt)
4288 {
4289         preempt_disable();
4290         kvm_load_guest_fpu(emul_to_vcpu(ctxt));
4291         /*
4292          * CR0.TS may reference the host fpu state, not the guest fpu state,
4293          * so it may be clear at this point.
4294          */
4295         clts();
4296 }
4297
4298 static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt)
4299 {
4300         preempt_enable();
4301 }
4302
4303 static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
4304                               struct x86_instruction_info *info,
4305                               enum x86_intercept_stage stage)
4306 {
4307         return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage);
4308 }
4309
4310 static void emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
4311                                u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
4312 {
4313         kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx);
4314 }
4315
4316 static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg)
4317 {
4318         return kvm_register_read(emul_to_vcpu(ctxt), reg);
4319 }
4320
4321 static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val)
4322 {
4323         kvm_register_write(emul_to_vcpu(ctxt), reg, val);
4324 }
4325
4326 static const struct x86_emulate_ops emulate_ops = {
4327         .read_gpr            = emulator_read_gpr,
4328         .write_gpr           = emulator_write_gpr,
4329         .read_std            = kvm_read_guest_virt_system,
4330         .write_std           = kvm_write_guest_virt_system,
4331         .fetch               = kvm_fetch_guest_virt,
4332         .read_emulated       = emulator_read_emulated,
4333         .write_emulated      = emulator_write_emulated,
4334         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
4335         .invlpg              = emulator_invlpg,
4336         .pio_in_emulated     = emulator_pio_in_emulated,
4337         .pio_out_emulated    = emulator_pio_out_emulated,
4338         .get_segment         = emulator_get_segment,
4339         .set_segment         = emulator_set_segment,
4340         .get_cached_segment_base = emulator_get_cached_segment_base,
4341         .get_gdt             = emulator_get_gdt,
4342         .get_idt             = emulator_get_idt,
4343         .set_gdt             = emulator_set_gdt,
4344         .set_idt             = emulator_set_idt,
4345         .get_cr              = emulator_get_cr,
4346         .set_cr              = emulator_set_cr,
4347         .set_rflags          = emulator_set_rflags,
4348         .cpl                 = emulator_get_cpl,
4349         .get_dr              = emulator_get_dr,
4350         .set_dr              = emulator_set_dr,
4351         .set_msr             = emulator_set_msr,
4352         .get_msr             = emulator_get_msr,
4353         .read_pmc            = emulator_read_pmc,
4354         .halt                = emulator_halt,
4355         .wbinvd              = emulator_wbinvd,
4356         .fix_hypercall       = emulator_fix_hypercall,
4357         .get_fpu             = emulator_get_fpu,
4358         .put_fpu             = emulator_put_fpu,
4359         .intercept           = emulator_intercept,
4360         .get_cpuid           = emulator_get_cpuid,
4361 };
4362
4363 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
4364 {
4365         u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask);
4366         /*
4367          * an sti; sti; sequence only disable interrupts for the first
4368          * instruction. So, if the last instruction, be it emulated or
4369          * not, left the system with the INT_STI flag enabled, it
4370          * means that the last instruction is an sti. We should not
4371          * leave the flag on in this case. The same goes for mov ss
4372          */
4373         if (!(int_shadow & mask))
4374                 kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
4375 }
4376
4377 static void inject_emulated_exception(struct kvm_vcpu *vcpu)
4378 {
4379         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4380         if (ctxt->exception.vector == PF_VECTOR)
4381                 kvm_propagate_fault(vcpu, &ctxt->exception);
4382         else if (ctxt->exception.error_code_valid)
4383                 kvm_queue_exception_e(vcpu, ctxt->exception.vector,
4384                                       ctxt->exception.error_code);
4385         else
4386                 kvm_queue_exception(vcpu, ctxt->exception.vector);
4387 }
4388
4389 static void init_decode_cache(struct x86_emulate_ctxt *ctxt)
4390 {
4391         memset(&ctxt->twobyte, 0,
4392                (void *)&ctxt->_regs - (void *)&ctxt->twobyte);
4393
4394         ctxt->fetch.start = 0;
4395         ctxt->fetch.end = 0;
4396         ctxt->io_read.pos = 0;
4397         ctxt->io_read.end = 0;
4398         ctxt->mem_read.pos = 0;
4399         ctxt->mem_read.end = 0;
4400 }
4401
4402 static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
4403 {
4404         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4405         int cs_db, cs_l;
4406
4407         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4408
4409         ctxt->eflags = kvm_get_rflags(vcpu);
4410         ctxt->eip = kvm_rip_read(vcpu);
4411         ctxt->mode = (!is_protmode(vcpu))               ? X86EMUL_MODE_REAL :
4412                      (ctxt->eflags & X86_EFLAGS_VM)     ? X86EMUL_MODE_VM86 :
4413                      cs_l                               ? X86EMUL_MODE_PROT64 :
4414                      cs_db                              ? X86EMUL_MODE_PROT32 :
4415                                                           X86EMUL_MODE_PROT16;
4416         ctxt->guest_mode = is_guest_mode(vcpu);
4417
4418         init_decode_cache(ctxt);
4419         vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
4420 }
4421
4422 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
4423 {
4424         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4425         int ret;
4426
4427         init_emulate_ctxt(vcpu);
4428
4429         ctxt->op_bytes = 2;
4430         ctxt->ad_bytes = 2;
4431         ctxt->_eip = ctxt->eip + inc_eip;
4432         ret = emulate_int_real(ctxt, irq);
4433
4434         if (ret != X86EMUL_CONTINUE)
4435                 return EMULATE_FAIL;
4436
4437         ctxt->eip = ctxt->_eip;
4438         kvm_rip_write(vcpu, ctxt->eip);
4439         kvm_set_rflags(vcpu, ctxt->eflags);
4440
4441         if (irq == NMI_VECTOR)
4442                 vcpu->arch.nmi_pending = 0;
4443         else
4444                 vcpu->arch.interrupt.pending = false;
4445
4446         return EMULATE_DONE;
4447 }
4448 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
4449
4450 static int handle_emulation_failure(struct kvm_vcpu *vcpu)
4451 {
4452         int r = EMULATE_DONE;
4453
4454         ++vcpu->stat.insn_emulation_fail;
4455         trace_kvm_emulate_insn_failed(vcpu);
4456         if (!is_guest_mode(vcpu)) {
4457                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4458                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
4459                 vcpu->run->internal.ndata = 0;
4460                 r = EMULATE_FAIL;
4461         }
4462         kvm_queue_exception(vcpu, UD_VECTOR);
4463
4464         return r;
4465 }
4466
4467 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva)
4468 {
4469         gpa_t gpa;
4470         pfn_t pfn;
4471
4472         if (tdp_enabled)
4473                 return false;
4474
4475         /*
4476          * if emulation was due to access to shadowed page table
4477          * and it failed try to unshadow page and re-enter the
4478          * guest to let CPU execute the instruction.
4479          */
4480         if (kvm_mmu_unprotect_page_virt(vcpu, gva))
4481                 return true;
4482
4483         gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL);
4484
4485         if (gpa == UNMAPPED_GVA)
4486                 return true; /* let cpu generate fault */
4487
4488         /*
4489          * Do not retry the unhandleable instruction if it faults on the
4490          * readonly host memory, otherwise it will goto a infinite loop:
4491          * retry instruction -> write #PF -> emulation fail -> retry
4492          * instruction -> ...
4493          */
4494         pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa));
4495         if (!is_error_pfn(pfn)) {
4496                 kvm_release_pfn_clean(pfn);
4497                 return true;
4498         }
4499
4500         return false;
4501 }
4502
4503 static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
4504                               unsigned long cr2,  int emulation_type)
4505 {
4506         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4507         unsigned long last_retry_eip, last_retry_addr, gpa = cr2;
4508
4509         last_retry_eip = vcpu->arch.last_retry_eip;
4510         last_retry_addr = vcpu->arch.last_retry_addr;
4511
4512         /*
4513          * If the emulation is caused by #PF and it is non-page_table
4514          * writing instruction, it means the VM-EXIT is caused by shadow
4515          * page protected, we can zap the shadow page and retry this
4516          * instruction directly.
4517          *
4518          * Note: if the guest uses a non-page-table modifying instruction
4519          * on the PDE that points to the instruction, then we will unmap
4520          * the instruction and go to an infinite loop. So, we cache the
4521          * last retried eip and the last fault address, if we meet the eip
4522          * and the address again, we can break out of the potential infinite
4523          * loop.
4524          */
4525         vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0;
4526
4527         if (!(emulation_type & EMULTYPE_RETRY))
4528                 return false;
4529
4530         if (x86_page_table_writing_insn(ctxt))
4531                 return false;
4532
4533         if (ctxt->eip == last_retry_eip && last_retry_addr == cr2)
4534                 return false;
4535
4536         vcpu->arch.last_retry_eip = ctxt->eip;
4537         vcpu->arch.last_retry_addr = cr2;
4538
4539         if (!vcpu->arch.mmu.direct_map)
4540                 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);
4541
4542         kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT);
4543
4544         return true;
4545 }
4546
4547 static int complete_emulated_mmio(struct kvm_vcpu *vcpu);
4548 static int complete_emulated_pio(struct kvm_vcpu *vcpu);
4549
4550 int x86_emulate_instruction(struct kvm_vcpu *vcpu,
4551                             unsigned long cr2,
4552                             int emulation_type,
4553                             void *insn,
4554                             int insn_len)
4555 {
4556         int r;
4557         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4558         bool writeback = true;
4559
4560         kvm_clear_exception_queue(vcpu);
4561
4562         if (!(emulation_type & EMULTYPE_NO_DECODE)) {
4563                 init_emulate_ctxt(vcpu);
4564                 ctxt->interruptibility = 0;
4565                 ctxt->have_exception = false;
4566                 ctxt->perm_ok = false;
4567
4568                 ctxt->only_vendor_specific_insn
4569                         = emulation_type & EMULTYPE_TRAP_UD;
4570
4571                 r = x86_decode_insn(ctxt, insn, insn_len);
4572
4573                 trace_kvm_emulate_insn_start(vcpu);
4574                 ++vcpu->stat.insn_emulation;
4575                 if (r != EMULATION_OK)  {
4576                         if (emulation_type & EMULTYPE_TRAP_UD)
4577                                 return EMULATE_FAIL;
4578                         if (reexecute_instruction(vcpu, cr2))
4579                                 return EMULATE_DONE;
4580                         if (emulation_type & EMULTYPE_SKIP)
4581                                 return EMULATE_FAIL;
4582                         return handle_emulation_failure(vcpu);
4583                 }
4584         }
4585
4586         if (emulation_type & EMULTYPE_SKIP) {
4587                 kvm_rip_write(vcpu, ctxt->_eip);
4588                 return EMULATE_DONE;
4589         }
4590
4591         if (retry_instruction(ctxt, cr2, emulation_type))
4592                 return EMULATE_DONE;
4593
4594         /* this is needed for vmware backdoor interface to work since it
4595            changes registers values  during IO operation */
4596         if (vcpu->arch.emulate_regs_need_sync_from_vcpu) {
4597                 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
4598                 emulator_invalidate_register_cache(ctxt);
4599         }
4600
4601 restart:
4602         r = x86_emulate_insn(ctxt);
4603
4604         if (r == EMULATION_INTERCEPTED)
4605                 return EMULATE_DONE;
4606
4607         if (r == EMULATION_FAILED) {
4608                 if (reexecute_instruction(vcpu, cr2))
4609                         return EMULATE_DONE;
4610
4611                 return handle_emulation_failure(vcpu);
4612         }
4613
4614         if (ctxt->have_exception) {
4615                 inject_emulated_exception(vcpu);
4616                 r = EMULATE_DONE;
4617         } else if (vcpu->arch.pio.count) {
4618                 if (!vcpu->arch.pio.in)
4619                         vcpu->arch.pio.count = 0;
4620                 else {
4621                         writeback = false;
4622                         vcpu->arch.complete_userspace_io = complete_emulated_pio;
4623                 }
4624                 r = EMULATE_DO_MMIO;
4625         } else if (vcpu->mmio_needed) {
4626                 if (!vcpu->mmio_is_write)
4627                         writeback = false;
4628                 r = EMULATE_DO_MMIO;
4629                 vcpu->arch.complete_userspace_io = complete_emulated_mmio;
4630         } else if (r == EMULATION_RESTART)
4631                 goto restart;
4632         else
4633                 r = EMULATE_DONE;
4634
4635         if (writeback) {
4636                 toggle_interruptibility(vcpu, ctxt->interruptibility);
4637                 kvm_set_rflags(vcpu, ctxt->eflags);
4638                 kvm_make_request(KVM_REQ_EVENT, vcpu);
4639                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
4640                 kvm_rip_write(vcpu, ctxt->eip);
4641         } else
4642                 vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
4643
4644         return r;
4645 }
4646 EXPORT_SYMBOL_GPL(x86_emulate_instruction);
4647
4648 int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
4649 {
4650         unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
4651         int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt,
4652                                             size, port, &val, 1);
4653         /* do not return to emulator after return from userspace */
4654         vcpu->arch.pio.count = 0;
4655         return ret;
4656 }
4657 EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
4658
4659 static void tsc_bad(void *info)
4660 {
4661         __this_cpu_write(cpu_tsc_khz, 0);
4662 }
4663
4664 static void tsc_khz_changed(void *data)
4665 {
4666         struct cpufreq_freqs *freq = data;
4667         unsigned long khz = 0;
4668
4669         if (data)
4670                 khz = freq->new;
4671         else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4672                 khz = cpufreq_quick_get(raw_smp_processor_id());
4673         if (!khz)
4674                 khz = tsc_khz;
4675         __this_cpu_write(cpu_tsc_khz, khz);
4676 }
4677
4678 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
4679                                      void *data)
4680 {
4681         struct cpufreq_freqs *freq = data;
4682         struct kvm *kvm;
4683         struct kvm_vcpu *vcpu;
4684         int i, send_ipi = 0;
4685
4686         /*
4687          * We allow guests to temporarily run on slowing clocks,
4688          * provided we notify them after, or to run on accelerating
4689          * clocks, provided we notify them before.  Thus time never
4690          * goes backwards.
4691          *
4692          * However, we have a problem.  We can't atomically update
4693          * the frequency of a given CPU from this function; it is
4694          * merely a notifier, which can be called from any CPU.
4695          * Changing the TSC frequency at arbitrary points in time
4696          * requires a recomputation of local variables related to
4697          * the TSC for each VCPU.  We must flag these local variables
4698          * to be updated and be sure the update takes place with the
4699          * new frequency before any guests proceed.
4700          *
4701          * Unfortunately, the combination of hotplug CPU and frequency
4702          * change creates an intractable locking scenario; the order
4703          * of when these callouts happen is undefined with respect to
4704          * CPU hotplug, and they can race with each other.  As such,
4705          * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
4706          * undefined; you can actually have a CPU frequency change take
4707          * place in between the computation of X and the setting of the
4708          * variable.  To protect against this problem, all updates of
4709          * the per_cpu tsc_khz variable are done in an interrupt
4710          * protected IPI, and all callers wishing to update the value
4711          * must wait for a synchronous IPI to complete (which is trivial
4712          * if the caller is on the CPU already).  This establishes the
4713          * necessary total order on variable updates.
4714          *
4715          * Note that because a guest time update may take place
4716          * anytime after the setting of the VCPU's request bit, the
4717          * correct TSC value must be set before the request.  However,
4718          * to ensure the update actually makes it to any guest which
4719          * starts running in hardware virtualization between the set
4720          * and the acquisition of the spinlock, we must also ping the
4721          * CPU after setting the request bit.
4722          *
4723          */
4724
4725         if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
4726                 return 0;
4727         if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
4728                 return 0;
4729
4730         smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4731
4732         raw_spin_lock(&kvm_lock);
4733         list_for_each_entry(kvm, &vm_list, vm_list) {
4734                 kvm_for_each_vcpu(i, vcpu, kvm) {
4735                         if (vcpu->cpu != freq->cpu)
4736                                 continue;
4737                         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
4738                         if (vcpu->cpu != smp_processor_id())
4739                                 send_ipi = 1;
4740                 }
4741         }
4742         raw_spin_unlock(&kvm_lock);
4743
4744         if (freq->old < freq->new && send_ipi) {
4745                 /*
4746                  * We upscale the frequency.  Must make the guest
4747                  * doesn't see old kvmclock values while running with
4748                  * the new frequency, otherwise we risk the guest sees
4749                  * time go backwards.
4750                  *
4751                  * In case we update the frequency for another cpu
4752                  * (which might be in guest context) send an interrupt
4753                  * to kick the cpu out of guest context.  Next time
4754                  * guest context is entered kvmclock will be updated,
4755                  * so the guest will not see stale values.
4756                  */
4757                 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4758         }
4759         return 0;
4760 }
4761
4762 static struct notifier_block kvmclock_cpufreq_notifier_block = {
4763         .notifier_call  = kvmclock_cpufreq_notifier
4764 };
4765
4766 static int kvmclock_cpu_notifier(struct notifier_block *nfb,
4767                                         unsigned long action, void *hcpu)
4768 {
4769         unsigned int cpu = (unsigned long)hcpu;
4770
4771         switch (action) {
4772                 case CPU_ONLINE:
4773                 case CPU_DOWN_FAILED:
4774                         smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4775                         break;
4776                 case CPU_DOWN_PREPARE:
4777                         smp_call_function_single(cpu, tsc_bad, NULL, 1);
4778                         break;
4779         }
4780         return NOTIFY_OK;
4781 }
4782
4783 static struct notifier_block kvmclock_cpu_notifier_block = {
4784         .notifier_call  = kvmclock_cpu_notifier,
4785         .priority = -INT_MAX
4786 };
4787
4788 static void kvm_timer_init(void)
4789 {
4790         int cpu;
4791
4792         max_tsc_khz = tsc_khz;
4793         register_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4794         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
4795 #ifdef CONFIG_CPU_FREQ
4796                 struct cpufreq_policy policy;
4797                 memset(&policy, 0, sizeof(policy));
4798                 cpu = get_cpu();
4799                 cpufreq_get_policy(&policy, cpu);
4800                 if (policy.cpuinfo.max_freq)
4801                         max_tsc_khz = policy.cpuinfo.max_freq;
4802                 put_cpu();
4803 #endif
4804                 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
4805                                           CPUFREQ_TRANSITION_NOTIFIER);
4806         }
4807         pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
4808         for_each_online_cpu(cpu)
4809                 smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4810 }
4811
4812 static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
4813
4814 int kvm_is_in_guest(void)
4815 {
4816         return __this_cpu_read(current_vcpu) != NULL;
4817 }
4818
4819 static int kvm_is_user_mode(void)
4820 {
4821         int user_mode = 3;
4822
4823         if (__this_cpu_read(current_vcpu))
4824                 user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu));
4825
4826         return user_mode != 0;
4827 }
4828
4829 static unsigned long kvm_get_guest_ip(void)
4830 {
4831         unsigned long ip = 0;
4832
4833         if (__this_cpu_read(current_vcpu))
4834                 ip = kvm_rip_read(__this_cpu_read(current_vcpu));
4835
4836         return ip;
4837 }
4838
4839 static struct perf_guest_info_callbacks kvm_guest_cbs = {
4840         .is_in_guest            = kvm_is_in_guest,
4841         .is_user_mode           = kvm_is_user_mode,
4842         .get_guest_ip           = kvm_get_guest_ip,
4843 };
4844
4845 void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
4846 {
4847         __this_cpu_write(current_vcpu, vcpu);
4848 }
4849 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
4850
4851 void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
4852 {
4853         __this_cpu_write(current_vcpu, NULL);
4854 }
4855 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
4856
4857 static void kvm_set_mmio_spte_mask(void)
4858 {
4859         u64 mask;
4860         int maxphyaddr = boot_cpu_data.x86_phys_bits;
4861
4862         /*
4863          * Set the reserved bits and the present bit of an paging-structure
4864          * entry to generate page fault with PFER.RSV = 1.
4865          */
4866         mask = ((1ull << (62 - maxphyaddr + 1)) - 1) << maxphyaddr;
4867         mask |= 1ull;
4868
4869 #ifdef CONFIG_X86_64
4870         /*
4871          * If reserved bit is not supported, clear the present bit to disable
4872          * mmio page fault.
4873          */
4874         if (maxphyaddr == 52)
4875                 mask &= ~1ull;
4876 #endif
4877
4878         kvm_mmu_set_mmio_spte_mask(mask);
4879 }
4880
4881 int kvm_arch_init(void *opaque)
4882 {
4883         int r;
4884         struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
4885
4886         if (kvm_x86_ops) {
4887                 printk(KERN_ERR "kvm: already loaded the other module\n");
4888                 r = -EEXIST;
4889                 goto out;
4890         }
4891
4892         if (!ops->cpu_has_kvm_support()) {
4893                 printk(KERN_ERR "kvm: no hardware support\n");
4894                 r = -EOPNOTSUPP;
4895                 goto out;
4896         }
4897         if (ops->disabled_by_bios()) {
4898                 printk(KERN_ERR "kvm: disabled by bios\n");
4899                 r = -EOPNOTSUPP;
4900                 goto out;
4901         }
4902
4903         r = kvm_mmu_module_init();
4904         if (r)
4905                 goto out;
4906
4907         kvm_set_mmio_spte_mask();
4908         kvm_init_msr_list();
4909
4910         kvm_x86_ops = ops;
4911         kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
4912                         PT_DIRTY_MASK, PT64_NX_MASK, 0);
4913
4914         kvm_timer_init();
4915
4916         perf_register_guest_info_callbacks(&kvm_guest_cbs);
4917
4918         if (cpu_has_xsave)
4919                 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
4920
4921         kvm_lapic_init();
4922         return 0;
4923
4924 out:
4925         return r;
4926 }
4927
4928 void kvm_arch_exit(void)
4929 {
4930         perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
4931
4932         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4933                 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
4934                                             CPUFREQ_TRANSITION_NOTIFIER);
4935         unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4936         kvm_x86_ops = NULL;
4937         kvm_mmu_module_exit();
4938 }
4939
4940 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
4941 {
4942         ++vcpu->stat.halt_exits;
4943         if (irqchip_in_kernel(vcpu->kvm)) {
4944                 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
4945                 return 1;
4946         } else {
4947                 vcpu->run->exit_reason = KVM_EXIT_HLT;
4948                 return 0;
4949         }
4950 }
4951 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
4952
4953 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
4954 {
4955         u64 param, ingpa, outgpa, ret;
4956         uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
4957         bool fast, longmode;
4958         int cs_db, cs_l;
4959
4960         /*
4961          * hypercall generates UD from non zero cpl and real mode
4962          * per HYPER-V spec
4963          */
4964         if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
4965                 kvm_queue_exception(vcpu, UD_VECTOR);
4966                 return 0;
4967         }
4968
4969         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4970         longmode = is_long_mode(vcpu) && cs_l == 1;
4971
4972         if (!longmode) {
4973                 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
4974                         (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
4975                 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
4976                         (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
4977                 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
4978                         (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
4979         }
4980 #ifdef CONFIG_X86_64
4981         else {
4982                 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
4983                 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
4984                 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
4985         }
4986 #endif
4987
4988         code = param & 0xffff;
4989         fast = (param >> 16) & 0x1;
4990         rep_cnt = (param >> 32) & 0xfff;
4991         rep_idx = (param >> 48) & 0xfff;
4992
4993         trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
4994
4995         switch (code) {
4996         case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
4997                 kvm_vcpu_on_spin(vcpu);
4998                 break;
4999         default:
5000                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
5001                 break;
5002         }
5003
5004         ret = res | (((u64)rep_done & 0xfff) << 32);
5005         if (longmode) {
5006                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
5007         } else {
5008                 kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32);
5009                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff);
5010         }
5011
5012         return 1;
5013 }
5014
5015 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
5016 {
5017         unsigned long nr, a0, a1, a2, a3, ret;
5018         int r = 1;
5019
5020         if (kvm_hv_hypercall_enabled(vcpu->kvm))
5021                 return kvm_hv_hypercall(vcpu);
5022
5023         nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
5024         a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
5025         a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
5026         a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
5027         a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
5028
5029         trace_kvm_hypercall(nr, a0, a1, a2, a3);
5030
5031         if (!is_long_mode(vcpu)) {
5032                 nr &= 0xFFFFFFFF;
5033                 a0 &= 0xFFFFFFFF;
5034                 a1 &= 0xFFFFFFFF;
5035                 a2 &= 0xFFFFFFFF;
5036                 a3 &= 0xFFFFFFFF;
5037         }
5038
5039         if (kvm_x86_ops->get_cpl(vcpu) != 0) {
5040                 ret = -KVM_EPERM;
5041                 goto out;
5042         }
5043
5044         switch (nr) {
5045         case KVM_HC_VAPIC_POLL_IRQ:
5046                 ret = 0;
5047                 break;
5048         default:
5049                 ret = -KVM_ENOSYS;
5050                 break;
5051         }
5052 out:
5053         kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
5054         ++vcpu->stat.hypercalls;
5055         return r;
5056 }
5057 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
5058
5059 int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
5060 {
5061         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5062         char instruction[3];
5063         unsigned long rip = kvm_rip_read(vcpu);
5064
5065         /*
5066          * Blow out the MMU to ensure that no other VCPU has an active mapping
5067          * to ensure that the updated hypercall appears atomically across all
5068          * VCPUs.
5069          */
5070         kvm_mmu_zap_all(vcpu->kvm);
5071
5072         kvm_x86_ops->patch_hypercall(vcpu, instruction);
5073
5074         return emulator_write_emulated(ctxt, rip, instruction, 3, NULL);
5075 }
5076
5077 /*
5078  * Check if userspace requested an interrupt window, and that the
5079  * interrupt window is open.
5080  *
5081  * No need to exit to userspace if we already have an interrupt queued.
5082  */
5083 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
5084 {
5085         return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
5086                 vcpu->run->request_interrupt_window &&
5087                 kvm_arch_interrupt_allowed(vcpu));
5088 }
5089
5090 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
5091 {
5092         struct kvm_run *kvm_run = vcpu->run;
5093
5094         kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
5095         kvm_run->cr8 = kvm_get_cr8(vcpu);
5096         kvm_run->apic_base = kvm_get_apic_base(vcpu);
5097         if (irqchip_in_kernel(vcpu->kvm))
5098                 kvm_run->ready_for_interrupt_injection = 1;
5099         else
5100                 kvm_run->ready_for_interrupt_injection =
5101                         kvm_arch_interrupt_allowed(vcpu) &&
5102                         !kvm_cpu_has_interrupt(vcpu) &&
5103                         !kvm_event_needs_reinjection(vcpu);
5104 }
5105
5106 static void vapic_enter(struct kvm_vcpu *vcpu)
5107 {
5108         struct kvm_lapic *apic = vcpu->arch.apic;
5109         struct page *page;
5110
5111         if (!apic || !apic->vapic_addr)
5112                 return;
5113
5114         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5115
5116         vcpu->arch.apic->vapic_page = page;
5117 }
5118
5119 static void vapic_exit(struct kvm_vcpu *vcpu)
5120 {
5121         struct kvm_lapic *apic = vcpu->arch.apic;
5122         int idx;
5123
5124         if (!apic || !apic->vapic_addr)
5125                 return;
5126
5127         idx = srcu_read_lock(&vcpu->kvm->srcu);
5128         kvm_release_page_dirty(apic->vapic_page);
5129         mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5130         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5131 }
5132
5133 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
5134 {
5135         int max_irr, tpr;
5136
5137         if (!kvm_x86_ops->update_cr8_intercept)
5138                 return;
5139
5140         if (!vcpu->arch.apic)
5141                 return;
5142
5143         if (!vcpu->arch.apic->vapic_addr)
5144                 max_irr = kvm_lapic_find_highest_irr(vcpu);
5145         else
5146                 max_irr = -1;
5147
5148         if (max_irr != -1)
5149                 max_irr >>= 4;
5150
5151         tpr = kvm_lapic_get_cr8(vcpu);
5152
5153         kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
5154 }
5155
5156 static void inject_pending_event(struct kvm_vcpu *vcpu)
5157 {
5158         /* try to reinject previous events if any */
5159         if (vcpu->arch.exception.pending) {
5160                 trace_kvm_inj_exception(vcpu->arch.exception.nr,
5161                                         vcpu->arch.exception.has_error_code,
5162                                         vcpu->arch.exception.error_code);
5163                 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
5164                                           vcpu->arch.exception.has_error_code,
5165                                           vcpu->arch.exception.error_code,
5166                                           vcpu->arch.exception.reinject);
5167                 return;
5168         }
5169
5170         if (vcpu->arch.nmi_injected) {
5171                 kvm_x86_ops->set_nmi(vcpu);
5172                 return;
5173         }
5174
5175         if (vcpu->arch.interrupt.pending) {
5176                 kvm_x86_ops->set_irq(vcpu);
5177                 return;
5178         }
5179
5180         /* try to inject new event if pending */
5181         if (vcpu->arch.nmi_pending) {
5182                 if (kvm_x86_ops->nmi_allowed(vcpu)) {
5183                         --vcpu->arch.nmi_pending;
5184                         vcpu->arch.nmi_injected = true;
5185                         kvm_x86_ops->set_nmi(vcpu);
5186                 }
5187         } else if (kvm_cpu_has_interrupt(vcpu)) {
5188                 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
5189                         kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
5190                                             false);
5191                         kvm_x86_ops->set_irq(vcpu);
5192                 }
5193         }
5194 }
5195
5196 static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu)
5197 {
5198         if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
5199                         !vcpu->guest_xcr0_loaded) {
5200                 /* kvm_set_xcr() also depends on this */
5201                 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
5202                 vcpu->guest_xcr0_loaded = 1;
5203         }
5204 }
5205
5206 static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu)
5207 {
5208         if (vcpu->guest_xcr0_loaded) {
5209                 if (vcpu->arch.xcr0 != host_xcr0)
5210                         xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
5211                 vcpu->guest_xcr0_loaded = 0;
5212         }
5213 }
5214
5215 static void process_nmi(struct kvm_vcpu *vcpu)
5216 {
5217         unsigned limit = 2;
5218
5219         /*
5220          * x86 is limited to one NMI running, and one NMI pending after it.
5221          * If an NMI is already in progress, limit further NMIs to just one.
5222          * Otherwise, allow two (and we'll inject the first one immediately).
5223          */
5224         if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected)
5225                 limit = 1;
5226
5227         vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0);
5228         vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit);
5229         kvm_make_request(KVM_REQ_EVENT, vcpu);
5230 }
5231
5232 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
5233 {
5234         int r;
5235         bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
5236                 vcpu->run->request_interrupt_window;
5237         bool req_immediate_exit = 0;
5238
5239         if (vcpu->requests) {
5240                 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
5241                         kvm_mmu_unload(vcpu);
5242                 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
5243                         __kvm_migrate_timers(vcpu);
5244                 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
5245                         r = kvm_guest_time_update(vcpu);
5246                         if (unlikely(r))
5247                                 goto out;
5248                 }
5249                 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
5250                         kvm_mmu_sync_roots(vcpu);
5251                 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
5252                         kvm_x86_ops->tlb_flush(vcpu);
5253                 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
5254                         vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
5255                         r = 0;
5256                         goto out;
5257                 }
5258                 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
5259                         vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
5260                         r = 0;
5261                         goto out;
5262                 }
5263                 if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) {
5264                         vcpu->fpu_active = 0;
5265                         kvm_x86_ops->fpu_deactivate(vcpu);
5266                 }
5267                 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
5268                         /* Page is swapped out. Do synthetic halt */
5269                         vcpu->arch.apf.halted = true;
5270                         r = 1;
5271                         goto out;
5272                 }
5273                 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
5274                         record_steal_time(vcpu);
5275                 if (kvm_check_request(KVM_REQ_NMI, vcpu))
5276                         process_nmi(vcpu);
5277                 req_immediate_exit =
5278                         kvm_check_request(KVM_REQ_IMMEDIATE_EXIT, vcpu);
5279                 if (kvm_check_request(KVM_REQ_PMU, vcpu))
5280                         kvm_handle_pmu_event(vcpu);
5281                 if (kvm_check_request(KVM_REQ_PMI, vcpu))
5282                         kvm_deliver_pmi(vcpu);
5283         }
5284
5285         if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
5286                 inject_pending_event(vcpu);
5287
5288                 /* enable NMI/IRQ window open exits if needed */
5289                 if (vcpu->arch.nmi_pending)
5290                         kvm_x86_ops->enable_nmi_window(vcpu);
5291                 else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
5292                         kvm_x86_ops->enable_irq_window(vcpu);
5293
5294                 if (kvm_lapic_enabled(vcpu)) {
5295                         update_cr8_intercept(vcpu);
5296                         kvm_lapic_sync_to_vapic(vcpu);
5297                 }
5298         }
5299
5300         r = kvm_mmu_reload(vcpu);
5301         if (unlikely(r)) {
5302                 goto cancel_injection;
5303         }
5304
5305         preempt_disable();
5306
5307         kvm_x86_ops->prepare_guest_switch(vcpu);
5308         if (vcpu->fpu_active)
5309                 kvm_load_guest_fpu(vcpu);
5310         kvm_load_guest_xcr0(vcpu);
5311
5312         vcpu->mode = IN_GUEST_MODE;
5313
5314         /* We should set ->mode before check ->requests,
5315          * see the comment in make_all_cpus_request.
5316          */
5317         smp_mb();
5318
5319         local_irq_disable();
5320
5321         if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
5322             || need_resched() || signal_pending(current)) {
5323                 vcpu->mode = OUTSIDE_GUEST_MODE;
5324                 smp_wmb();
5325                 local_irq_enable();
5326                 preempt_enable();
5327                 r = 1;
5328                 goto cancel_injection;
5329         }
5330
5331         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5332
5333         if (req_immediate_exit)
5334                 smp_send_reschedule(vcpu->cpu);
5335
5336         kvm_guest_enter();
5337
5338         if (unlikely(vcpu->arch.switch_db_regs)) {
5339                 set_debugreg(0, 7);
5340                 set_debugreg(vcpu->arch.eff_db[0], 0);
5341                 set_debugreg(vcpu->arch.eff_db[1], 1);
5342                 set_debugreg(vcpu->arch.eff_db[2], 2);
5343                 set_debugreg(vcpu->arch.eff_db[3], 3);
5344         }
5345
5346         trace_kvm_entry(vcpu->vcpu_id);
5347         kvm_x86_ops->run(vcpu);
5348
5349         /*
5350          * If the guest has used debug registers, at least dr7
5351          * will be disabled while returning to the host.
5352          * If we don't have active breakpoints in the host, we don't
5353          * care about the messed up debug address registers. But if
5354          * we have some of them active, restore the old state.
5355          */
5356         if (hw_breakpoint_active())
5357                 hw_breakpoint_restore();
5358
5359         vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu);
5360
5361         vcpu->mode = OUTSIDE_GUEST_MODE;
5362         smp_wmb();
5363         local_irq_enable();
5364
5365         ++vcpu->stat.exits;
5366
5367         /*
5368          * We must have an instruction between local_irq_enable() and
5369          * kvm_guest_exit(), so the timer interrupt isn't delayed by
5370          * the interrupt shadow.  The stat.exits increment will do nicely.
5371          * But we need to prevent reordering, hence this barrier():
5372          */
5373         barrier();
5374
5375         kvm_guest_exit();
5376
5377         preempt_enable();
5378
5379         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5380
5381         /*
5382          * Profile KVM exit RIPs:
5383          */
5384         if (unlikely(prof_on == KVM_PROFILING)) {
5385                 unsigned long rip = kvm_rip_read(vcpu);
5386                 profile_hit(KVM_PROFILING, (void *)rip);
5387         }
5388
5389         if (unlikely(vcpu->arch.tsc_always_catchup))
5390                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
5391
5392         if (vcpu->arch.apic_attention)
5393                 kvm_lapic_sync_from_vapic(vcpu);
5394
5395         r = kvm_x86_ops->handle_exit(vcpu);
5396         return r;
5397
5398 cancel_injection:
5399         kvm_x86_ops->cancel_injection(vcpu);
5400         if (unlikely(vcpu->arch.apic_attention))
5401                 kvm_lapic_sync_from_vapic(vcpu);
5402 out:
5403         return r;
5404 }
5405
5406
5407 static int __vcpu_run(struct kvm_vcpu *vcpu)
5408 {
5409         int r;
5410         struct kvm *kvm = vcpu->kvm;
5411
5412         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
5413                 pr_debug("vcpu %d received sipi with vector # %x\n",
5414                          vcpu->vcpu_id, vcpu->arch.sipi_vector);
5415                 kvm_lapic_reset(vcpu);
5416                 r = kvm_arch_vcpu_reset(vcpu);
5417                 if (r)
5418                         return r;
5419                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5420         }
5421
5422         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5423         vapic_enter(vcpu);
5424
5425         r = 1;
5426         while (r > 0) {
5427                 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
5428                     !vcpu->arch.apf.halted)
5429                         r = vcpu_enter_guest(vcpu);
5430                 else {
5431                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5432                         kvm_vcpu_block(vcpu);
5433                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5434                         if (kvm_check_request(KVM_REQ_UNHALT, vcpu))
5435                         {
5436                                 switch(vcpu->arch.mp_state) {
5437                                 case KVM_MP_STATE_HALTED:
5438                                         vcpu->arch.mp_state =
5439                                                 KVM_MP_STATE_RUNNABLE;
5440                                 case KVM_MP_STATE_RUNNABLE:
5441                                         vcpu->arch.apf.halted = false;
5442                                         break;
5443                                 case KVM_MP_STATE_SIPI_RECEIVED:
5444                                 default:
5445                                         r = -EINTR;
5446                                         break;
5447                                 }
5448                         }
5449                 }
5450
5451                 if (r <= 0)
5452                         break;
5453
5454                 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
5455                 if (kvm_cpu_has_pending_timer(vcpu))
5456                         kvm_inject_pending_timer_irqs(vcpu);
5457
5458                 if (dm_request_for_irq_injection(vcpu)) {
5459                         r = -EINTR;
5460                         vcpu->run->exit_reason = KVM_EXIT_INTR;
5461                         ++vcpu->stat.request_irq_exits;
5462                 }
5463
5464                 kvm_check_async_pf_completion(vcpu);
5465
5466                 if (signal_pending(current)) {
5467                         r = -EINTR;
5468                         vcpu->run->exit_reason = KVM_EXIT_INTR;
5469                         ++vcpu->stat.signal_exits;
5470                 }
5471                 if (need_resched()) {
5472                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5473                         kvm_resched(vcpu);
5474                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5475                 }
5476         }
5477
5478         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5479
5480         vapic_exit(vcpu);
5481
5482         return r;
5483 }
5484
5485 static inline int complete_emulated_io(struct kvm_vcpu *vcpu)
5486 {
5487         int r;
5488         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5489         r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
5490         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5491         if (r != EMULATE_DONE)
5492                 return 0;
5493         return 1;
5494 }
5495
5496 static int complete_emulated_pio(struct kvm_vcpu *vcpu)
5497 {
5498         BUG_ON(!vcpu->arch.pio.count);
5499
5500         return complete_emulated_io(vcpu);
5501 }
5502
5503 /*
5504  * Implements the following, as a state machine:
5505  *
5506  * read:
5507  *   for each fragment
5508  *     write gpa, len
5509  *     exit
5510  *     copy data
5511  *   execute insn
5512  *
5513  * write:
5514  *   for each fragment
5515  *      write gpa, len
5516  *      copy data
5517  *      exit
5518  */
5519 static int complete_emulated_mmio(struct kvm_vcpu *vcpu)
5520 {
5521         struct kvm_run *run = vcpu->run;
5522         struct kvm_mmio_fragment *frag;
5523
5524         BUG_ON(!vcpu->mmio_needed);
5525
5526         /* Complete previous fragment */
5527         frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment++];
5528         if (!vcpu->mmio_is_write)
5529                 memcpy(frag->data, run->mmio.data, frag->len);
5530         if (vcpu->mmio_cur_fragment == vcpu->mmio_nr_fragments) {
5531                 vcpu->mmio_needed = 0;
5532                 if (vcpu->mmio_is_write)
5533                         return 1;
5534                 vcpu->mmio_read_completed = 1;
5535                 return complete_emulated_io(vcpu);
5536         }
5537         /* Initiate next fragment */
5538         ++frag;
5539         run->exit_reason = KVM_EXIT_MMIO;
5540         run->mmio.phys_addr = frag->gpa;
5541         if (vcpu->mmio_is_write)
5542                 memcpy(run->mmio.data, frag->data, frag->len);
5543         run->mmio.len = frag->len;
5544         run->mmio.is_write = vcpu->mmio_is_write;
5545         vcpu->arch.complete_userspace_io = complete_emulated_mmio;
5546         return 0;
5547 }
5548
5549
5550 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
5551 {
5552         int r;
5553         sigset_t sigsaved;
5554
5555         if (!tsk_used_math(current) && init_fpu(current))
5556                 return -ENOMEM;
5557
5558         if (vcpu->sigset_active)
5559                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
5560
5561         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
5562                 kvm_vcpu_block(vcpu);
5563                 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
5564                 r = -EAGAIN;
5565                 goto out;
5566         }
5567
5568         /* re-sync apic's tpr */
5569         if (!irqchip_in_kernel(vcpu->kvm)) {
5570                 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
5571                         r = -EINVAL;
5572                         goto out;
5573                 }
5574         }
5575
5576         if (unlikely(vcpu->arch.complete_userspace_io)) {
5577                 int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io;
5578                 vcpu->arch.complete_userspace_io = NULL;
5579                 r = cui(vcpu);
5580                 if (r <= 0)
5581                         goto out;
5582         } else
5583                 WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed);
5584
5585         r = __vcpu_run(vcpu);
5586
5587 out:
5588         post_kvm_run_save(vcpu);
5589         if (vcpu->sigset_active)
5590                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
5591
5592         return r;
5593 }
5594
5595 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5596 {
5597         if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
5598                 /*
5599                  * We are here if userspace calls get_regs() in the middle of
5600                  * instruction emulation. Registers state needs to be copied
5601                  * back from emulation context to vcpu. Userspace shouldn't do
5602                  * that usually, but some bad designed PV devices (vmware
5603                  * backdoor interface) need this to work
5604                  */
5605                 emulator_writeback_register_cache(&vcpu->arch.emulate_ctxt);
5606                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
5607         }
5608         regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
5609         regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
5610         regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
5611         regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
5612         regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
5613         regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
5614         regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
5615         regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
5616 #ifdef CONFIG_X86_64
5617         regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
5618         regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
5619         regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
5620         regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
5621         regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
5622         regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
5623         regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
5624         regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
5625 #endif
5626
5627         regs->rip = kvm_rip_read(vcpu);
5628         regs->rflags = kvm_get_rflags(vcpu);
5629
5630         return 0;
5631 }
5632
5633 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5634 {
5635         vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
5636         vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
5637
5638         kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
5639         kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
5640         kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
5641         kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
5642         kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
5643         kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
5644         kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
5645         kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
5646 #ifdef CONFIG_X86_64
5647         kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
5648         kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
5649         kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
5650         kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
5651         kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
5652         kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
5653         kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
5654         kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
5655 #endif
5656
5657         kvm_rip_write(vcpu, regs->rip);
5658         kvm_set_rflags(vcpu, regs->rflags);
5659
5660         vcpu->arch.exception.pending = false;
5661
5662         kvm_make_request(KVM_REQ_EVENT, vcpu);
5663
5664         return 0;
5665 }
5666
5667 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
5668 {
5669         struct kvm_segment cs;
5670
5671         kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
5672         *db = cs.db;
5673         *l = cs.l;
5674 }
5675 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
5676
5677 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
5678                                   struct kvm_sregs *sregs)
5679 {
5680         struct desc_ptr dt;
5681
5682         kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5683         kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5684         kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5685         kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5686         kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5687         kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5688
5689         kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5690         kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5691
5692         kvm_x86_ops->get_idt(vcpu, &dt);
5693         sregs->idt.limit = dt.size;
5694         sregs->idt.base = dt.address;
5695         kvm_x86_ops->get_gdt(vcpu, &dt);
5696         sregs->gdt.limit = dt.size;
5697         sregs->gdt.base = dt.address;
5698
5699         sregs->cr0 = kvm_read_cr0(vcpu);
5700         sregs->cr2 = vcpu->arch.cr2;
5701         sregs->cr3 = kvm_read_cr3(vcpu);
5702         sregs->cr4 = kvm_read_cr4(vcpu);
5703         sregs->cr8 = kvm_get_cr8(vcpu);
5704         sregs->efer = vcpu->arch.efer;
5705         sregs->apic_base = kvm_get_apic_base(vcpu);
5706
5707         memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
5708
5709         if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
5710                 set_bit(vcpu->arch.interrupt.nr,
5711                         (unsigned long *)sregs->interrupt_bitmap);
5712
5713         return 0;
5714 }
5715
5716 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
5717                                     struct kvm_mp_state *mp_state)
5718 {
5719         mp_state->mp_state = vcpu->arch.mp_state;
5720         return 0;
5721 }
5722
5723 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
5724                                     struct kvm_mp_state *mp_state)
5725 {
5726         vcpu->arch.mp_state = mp_state->mp_state;
5727         kvm_make_request(KVM_REQ_EVENT, vcpu);
5728         return 0;
5729 }
5730
5731 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
5732                     int reason, bool has_error_code, u32 error_code)
5733 {
5734         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
5735         int ret;
5736
5737         init_emulate_ctxt(vcpu);
5738
5739         ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason,
5740                                    has_error_code, error_code);
5741
5742         if (ret)
5743                 return EMULATE_FAIL;
5744
5745         kvm_rip_write(vcpu, ctxt->eip);
5746         kvm_set_rflags(vcpu, ctxt->eflags);
5747         kvm_make_request(KVM_REQ_EVENT, vcpu);
5748         return EMULATE_DONE;
5749 }
5750 EXPORT_SYMBOL_GPL(kvm_task_switch);
5751
5752 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
5753                                   struct kvm_sregs *sregs)
5754 {
5755         int mmu_reset_needed = 0;
5756         int pending_vec, max_bits, idx;
5757         struct desc_ptr dt;
5758
5759         dt.size = sregs->idt.limit;
5760         dt.address = sregs->idt.base;
5761         kvm_x86_ops->set_idt(vcpu, &dt);
5762         dt.size = sregs->gdt.limit;
5763         dt.address = sregs->gdt.base;
5764         kvm_x86_ops->set_gdt(vcpu, &dt);
5765
5766         vcpu->arch.cr2 = sregs->cr2;
5767         mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
5768         vcpu->arch.cr3 = sregs->cr3;
5769         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
5770
5771         kvm_set_cr8(vcpu, sregs->cr8);
5772
5773         mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
5774         kvm_x86_ops->set_efer(vcpu, sregs->efer);
5775         kvm_set_apic_base(vcpu, sregs->apic_base);
5776
5777         mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
5778         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
5779         vcpu->arch.cr0 = sregs->cr0;
5780
5781         mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
5782         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
5783         if (sregs->cr4 & X86_CR4_OSXSAVE)
5784                 kvm_update_cpuid(vcpu);
5785
5786         idx = srcu_read_lock(&vcpu->kvm->srcu);
5787         if (!is_long_mode(vcpu) && is_pae(vcpu)) {
5788                 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
5789                 mmu_reset_needed = 1;
5790         }
5791         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5792
5793         if (mmu_reset_needed)
5794                 kvm_mmu_reset_context(vcpu);
5795
5796         max_bits = KVM_NR_INTERRUPTS;
5797         pending_vec = find_first_bit(
5798                 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
5799         if (pending_vec < max_bits) {
5800                 kvm_queue_interrupt(vcpu, pending_vec, false);
5801                 pr_debug("Set back pending irq %d\n", pending_vec);
5802         }
5803
5804         kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5805         kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5806         kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5807         kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5808         kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5809         kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5810
5811         kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5812         kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5813
5814         update_cr8_intercept(vcpu);
5815
5816         /* Older userspace won't unhalt the vcpu on reset. */
5817         if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
5818             sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
5819             !is_protmode(vcpu))
5820                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5821
5822         kvm_make_request(KVM_REQ_EVENT, vcpu);
5823
5824         return 0;
5825 }
5826
5827 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
5828                                         struct kvm_guest_debug *dbg)
5829 {
5830         unsigned long rflags;
5831         int i, r;
5832
5833         if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
5834                 r = -EBUSY;
5835                 if (vcpu->arch.exception.pending)
5836                         goto out;
5837                 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
5838                         kvm_queue_exception(vcpu, DB_VECTOR);
5839                 else
5840                         kvm_queue_exception(vcpu, BP_VECTOR);
5841         }
5842
5843         /*
5844          * Read rflags as long as potentially injected trace flags are still
5845          * filtered out.
5846          */
5847         rflags = kvm_get_rflags(vcpu);
5848
5849         vcpu->guest_debug = dbg->control;
5850         if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
5851                 vcpu->guest_debug = 0;
5852
5853         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
5854                 for (i = 0; i < KVM_NR_DB_REGS; ++i)
5855                         vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
5856                 vcpu->arch.switch_db_regs =
5857                         (dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
5858         } else {
5859                 for (i = 0; i < KVM_NR_DB_REGS; i++)
5860                         vcpu->arch.eff_db[i] = vcpu->arch.db[i];
5861                 vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
5862         }
5863
5864         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
5865                 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
5866                         get_segment_base(vcpu, VCPU_SREG_CS);
5867
5868         /*
5869          * Trigger an rflags update that will inject or remove the trace
5870          * flags.
5871          */
5872         kvm_set_rflags(vcpu, rflags);
5873
5874         kvm_x86_ops->set_guest_debug(vcpu, dbg);
5875
5876         r = 0;
5877
5878 out:
5879
5880         return r;
5881 }
5882
5883 /*
5884  * Translate a guest virtual address to a guest physical address.
5885  */
5886 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
5887                                     struct kvm_translation *tr)
5888 {
5889         unsigned long vaddr = tr->linear_address;
5890         gpa_t gpa;
5891         int idx;
5892
5893         idx = srcu_read_lock(&vcpu->kvm->srcu);
5894         gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
5895         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5896         tr->physical_address = gpa;
5897         tr->valid = gpa != UNMAPPED_GVA;
5898         tr->writeable = 1;
5899         tr->usermode = 0;
5900
5901         return 0;
5902 }
5903
5904 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5905 {
5906         struct i387_fxsave_struct *fxsave =
5907                         &vcpu->arch.guest_fpu.state->fxsave;
5908
5909         memcpy(fpu->fpr, fxsave->st_space, 128);
5910         fpu->fcw = fxsave->cwd;
5911         fpu->fsw = fxsave->swd;
5912         fpu->ftwx = fxsave->twd;
5913         fpu->last_opcode = fxsave->fop;
5914         fpu->last_ip = fxsave->rip;
5915         fpu->last_dp = fxsave->rdp;
5916         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
5917
5918         return 0;
5919 }
5920
5921 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5922 {
5923         struct i387_fxsave_struct *fxsave =
5924                         &vcpu->arch.guest_fpu.state->fxsave;
5925
5926         memcpy(fxsave->st_space, fpu->fpr, 128);
5927         fxsave->cwd = fpu->fcw;
5928         fxsave->swd = fpu->fsw;
5929         fxsave->twd = fpu->ftwx;
5930         fxsave->fop = fpu->last_opcode;
5931         fxsave->rip = fpu->last_ip;
5932         fxsave->rdp = fpu->last_dp;
5933         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
5934
5935         return 0;
5936 }
5937
5938 int fx_init(struct kvm_vcpu *vcpu)
5939 {
5940         int err;
5941
5942         err = fpu_alloc(&vcpu->arch.guest_fpu);
5943         if (err)
5944                 return err;
5945
5946         fpu_finit(&vcpu->arch.guest_fpu);
5947
5948         /*
5949          * Ensure guest xcr0 is valid for loading
5950          */
5951         vcpu->arch.xcr0 = XSTATE_FP;
5952
5953         vcpu->arch.cr0 |= X86_CR0_ET;
5954
5955         return 0;
5956 }
5957 EXPORT_SYMBOL_GPL(fx_init);
5958
5959 static void fx_free(struct kvm_vcpu *vcpu)
5960 {
5961         fpu_free(&vcpu->arch.guest_fpu);
5962 }
5963
5964 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
5965 {
5966         if (vcpu->guest_fpu_loaded)
5967                 return;
5968
5969         /*
5970          * Restore all possible states in the guest,
5971          * and assume host would use all available bits.
5972          * Guest xcr0 would be loaded later.
5973          */
5974         kvm_put_guest_xcr0(vcpu);
5975         vcpu->guest_fpu_loaded = 1;
5976         unlazy_fpu(current);
5977         fpu_restore_checking(&vcpu->arch.guest_fpu);
5978         trace_kvm_fpu(1);
5979 }
5980
5981 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
5982 {
5983         kvm_put_guest_xcr0(vcpu);
5984
5985         if (!vcpu->guest_fpu_loaded)
5986                 return;
5987
5988         vcpu->guest_fpu_loaded = 0;
5989         fpu_save_init(&vcpu->arch.guest_fpu);
5990         ++vcpu->stat.fpu_reload;
5991         kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu);
5992         trace_kvm_fpu(0);
5993 }
5994
5995 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
5996 {
5997         kvmclock_reset(vcpu);
5998
5999         free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
6000         fx_free(vcpu);
6001         kvm_x86_ops->vcpu_free(vcpu);
6002 }
6003
6004 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
6005                                                 unsigned int id)
6006 {
6007         if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
6008                 printk_once(KERN_WARNING
6009                 "kvm: SMP vm created on host with unstable TSC; "
6010                 "guest TSC will not be reliable\n");
6011         return kvm_x86_ops->vcpu_create(kvm, id);
6012 }
6013
6014 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
6015 {
6016         int r;
6017
6018         vcpu->arch.mtrr_state.have_fixed = 1;
6019         vcpu_load(vcpu);
6020         r = kvm_arch_vcpu_reset(vcpu);
6021         if (r == 0)
6022                 r = kvm_mmu_setup(vcpu);
6023         vcpu_put(vcpu);
6024
6025         return r;
6026 }
6027
6028 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
6029 {
6030         vcpu->arch.apf.msr_val = 0;
6031
6032         vcpu_load(vcpu);
6033         kvm_mmu_unload(vcpu);
6034         vcpu_put(vcpu);
6035
6036         fx_free(vcpu);
6037         kvm_x86_ops->vcpu_free(vcpu);
6038 }
6039
6040 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
6041 {
6042         atomic_set(&vcpu->arch.nmi_queued, 0);
6043         vcpu->arch.nmi_pending = 0;
6044         vcpu->arch.nmi_injected = false;
6045
6046         vcpu->arch.switch_db_regs = 0;
6047         memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
6048         vcpu->arch.dr6 = DR6_FIXED_1;
6049         vcpu->arch.dr7 = DR7_FIXED_1;
6050
6051         kvm_make_request(KVM_REQ_EVENT, vcpu);
6052         vcpu->arch.apf.msr_val = 0;
6053         vcpu->arch.st.msr_val = 0;
6054
6055         kvmclock_reset(vcpu);
6056
6057         kvm_clear_async_pf_completion_queue(vcpu);
6058         kvm_async_pf_hash_reset(vcpu);
6059         vcpu->arch.apf.halted = false;
6060
6061         kvm_pmu_reset(vcpu);
6062
6063         return kvm_x86_ops->vcpu_reset(vcpu);
6064 }
6065
6066 int kvm_arch_hardware_enable(void *garbage)
6067 {
6068         struct kvm *kvm;
6069         struct kvm_vcpu *vcpu;
6070         int i;
6071         int ret;
6072         u64 local_tsc;
6073         u64 max_tsc = 0;
6074         bool stable, backwards_tsc = false;
6075
6076         kvm_shared_msr_cpu_online();
6077         ret = kvm_x86_ops->hardware_enable(garbage);
6078         if (ret != 0)
6079                 return ret;
6080
6081         local_tsc = native_read_tsc();
6082         stable = !check_tsc_unstable();
6083         list_for_each_entry(kvm, &vm_list, vm_list) {
6084                 kvm_for_each_vcpu(i, vcpu, kvm) {
6085                         if (!stable && vcpu->cpu == smp_processor_id())
6086                                 set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
6087                         if (stable && vcpu->arch.last_host_tsc > local_tsc) {
6088                                 backwards_tsc = true;
6089                                 if (vcpu->arch.last_host_tsc > max_tsc)
6090                                         max_tsc = vcpu->arch.last_host_tsc;
6091                         }
6092                 }
6093         }
6094
6095         /*
6096          * Sometimes, even reliable TSCs go backwards.  This happens on
6097          * platforms that reset TSC during suspend or hibernate actions, but
6098          * maintain synchronization.  We must compensate.  Fortunately, we can
6099          * detect that condition here, which happens early in CPU bringup,
6100          * before any KVM threads can be running.  Unfortunately, we can't
6101          * bring the TSCs fully up to date with real time, as we aren't yet far
6102          * enough into CPU bringup that we know how much real time has actually
6103          * elapsed; our helper function, get_kernel_ns() will be using boot
6104          * variables that haven't been updated yet.
6105          *
6106          * So we simply find the maximum observed TSC above, then record the
6107          * adjustment to TSC in each VCPU.  When the VCPU later gets loaded,
6108          * the adjustment will be applied.  Note that we accumulate
6109          * adjustments, in case multiple suspend cycles happen before some VCPU
6110          * gets a chance to run again.  In the event that no KVM threads get a
6111          * chance to run, we will miss the entire elapsed period, as we'll have
6112          * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
6113          * loose cycle time.  This isn't too big a deal, since the loss will be
6114          * uniform across all VCPUs (not to mention the scenario is extremely
6115          * unlikely). It is possible that a second hibernate recovery happens
6116          * much faster than a first, causing the observed TSC here to be
6117          * smaller; this would require additional padding adjustment, which is
6118          * why we set last_host_tsc to the local tsc observed here.
6119          *
6120          * N.B. - this code below runs only on platforms with reliable TSC,
6121          * as that is the only way backwards_tsc is set above.  Also note
6122          * that this runs for ALL vcpus, which is not a bug; all VCPUs should
6123          * have the same delta_cyc adjustment applied if backwards_tsc
6124          * is detected.  Note further, this adjustment is only done once,
6125          * as we reset last_host_tsc on all VCPUs to stop this from being
6126          * called multiple times (one for each physical CPU bringup).
6127          *
6128          * Platforms with unreliable TSCs don't have to deal with this, they
6129          * will be compensated by the logic in vcpu_load, which sets the TSC to
6130          * catchup mode.  This will catchup all VCPUs to real time, but cannot
6131          * guarantee that they stay in perfect synchronization.
6132          */
6133         if (backwards_tsc) {
6134                 u64 delta_cyc = max_tsc - local_tsc;
6135                 list_for_each_entry(kvm, &vm_list, vm_list) {
6136                         kvm_for_each_vcpu(i, vcpu, kvm) {
6137                                 vcpu->arch.tsc_offset_adjustment += delta_cyc;
6138                                 vcpu->arch.last_host_tsc = local_tsc;
6139                         }
6140
6141                         /*
6142                          * We have to disable TSC offset matching.. if you were
6143                          * booting a VM while issuing an S4 host suspend....
6144                          * you may have some problem.  Solving this issue is
6145                          * left as an exercise to the reader.
6146                          */
6147                         kvm->arch.last_tsc_nsec = 0;
6148                         kvm->arch.last_tsc_write = 0;
6149                 }
6150
6151         }
6152         return 0;
6153 }
6154
6155 void kvm_arch_hardware_disable(void *garbage)
6156 {
6157         kvm_x86_ops->hardware_disable(garbage);
6158         drop_user_return_notifiers(garbage);
6159 }
6160
6161 int kvm_arch_hardware_setup(void)
6162 {
6163         return kvm_x86_ops->hardware_setup();
6164 }
6165
6166 void kvm_arch_hardware_unsetup(void)
6167 {
6168         kvm_x86_ops->hardware_unsetup();
6169 }
6170
6171 void kvm_arch_check_processor_compat(void *rtn)
6172 {
6173         kvm_x86_ops->check_processor_compatibility(rtn);
6174 }
6175
6176 bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)
6177 {
6178         return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL);
6179 }
6180
6181 struct static_key kvm_no_apic_vcpu __read_mostly;
6182
6183 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
6184 {
6185         struct page *page;
6186         struct kvm *kvm;
6187         int r;
6188
6189         BUG_ON(vcpu->kvm == NULL);
6190         kvm = vcpu->kvm;
6191
6192         vcpu->arch.emulate_ctxt.ops = &emulate_ops;
6193         if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
6194                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
6195         else
6196                 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
6197
6198         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
6199         if (!page) {
6200                 r = -ENOMEM;
6201                 goto fail;
6202         }
6203         vcpu->arch.pio_data = page_address(page);
6204
6205         kvm_set_tsc_khz(vcpu, max_tsc_khz);
6206
6207         r = kvm_mmu_create(vcpu);
6208         if (r < 0)
6209                 goto fail_free_pio_data;
6210
6211         if (irqchip_in_kernel(kvm)) {
6212                 r = kvm_create_lapic(vcpu);
6213                 if (r < 0)
6214                         goto fail_mmu_destroy;
6215         } else
6216                 static_key_slow_inc(&kvm_no_apic_vcpu);
6217
6218         vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
6219                                        GFP_KERNEL);
6220         if (!vcpu->arch.mce_banks) {
6221                 r = -ENOMEM;
6222                 goto fail_free_lapic;
6223         }
6224         vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
6225
6226         if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL))
6227                 goto fail_free_mce_banks;
6228
6229         kvm_async_pf_hash_reset(vcpu);
6230         kvm_pmu_init(vcpu);
6231
6232         return 0;
6233 fail_free_mce_banks:
6234         kfree(vcpu->arch.mce_banks);
6235 fail_free_lapic:
6236         kvm_free_lapic(vcpu);
6237 fail_mmu_destroy:
6238         kvm_mmu_destroy(vcpu);
6239 fail_free_pio_data:
6240         free_page((unsigned long)vcpu->arch.pio_data);
6241 fail:
6242         return r;
6243 }
6244
6245 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
6246 {
6247         int idx;
6248
6249         kvm_pmu_destroy(vcpu);
6250         kfree(vcpu->arch.mce_banks);
6251         kvm_free_lapic(vcpu);
6252         idx = srcu_read_lock(&vcpu->kvm->srcu);
6253         kvm_mmu_destroy(vcpu);
6254         srcu_read_unlock(&vcpu->kvm->srcu, idx);
6255         free_page((unsigned long)vcpu->arch.pio_data);
6256         if (!irqchip_in_kernel(vcpu->kvm))
6257                 static_key_slow_dec(&kvm_no_apic_vcpu);
6258 }
6259
6260 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
6261 {
6262         if (type)
6263                 return -EINVAL;
6264
6265         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
6266         INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
6267
6268         /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
6269         set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
6270
6271         raw_spin_lock_init(&kvm->arch.tsc_write_lock);
6272
6273         return 0;
6274 }
6275
6276 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
6277 {
6278         vcpu_load(vcpu);
6279         kvm_mmu_unload(vcpu);
6280         vcpu_put(vcpu);
6281 }
6282
6283 static void kvm_free_vcpus(struct kvm *kvm)
6284 {
6285         unsigned int i;
6286         struct kvm_vcpu *vcpu;
6287
6288         /*
6289          * Unpin any mmu pages first.
6290          */
6291         kvm_for_each_vcpu(i, vcpu, kvm) {
6292                 kvm_clear_async_pf_completion_queue(vcpu);
6293                 kvm_unload_vcpu_mmu(vcpu);
6294         }
6295         kvm_for_each_vcpu(i, vcpu, kvm)
6296                 kvm_arch_vcpu_free(vcpu);
6297
6298         mutex_lock(&kvm->lock);
6299         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
6300                 kvm->vcpus[i] = NULL;
6301
6302         atomic_set(&kvm->online_vcpus, 0);
6303         mutex_unlock(&kvm->lock);
6304 }
6305
6306 void kvm_arch_sync_events(struct kvm *kvm)
6307 {
6308         kvm_free_all_assigned_devices(kvm);
6309         kvm_free_pit(kvm);
6310 }
6311
6312 void kvm_arch_destroy_vm(struct kvm *kvm)
6313 {
6314         kvm_iommu_unmap_guest(kvm);
6315         kfree(kvm->arch.vpic);
6316         kfree(kvm->arch.vioapic);
6317         kvm_free_vcpus(kvm);
6318         if (kvm->arch.apic_access_page)
6319                 put_page(kvm->arch.apic_access_page);
6320         if (kvm->arch.ept_identity_pagetable)
6321                 put_page(kvm->arch.ept_identity_pagetable);
6322 }
6323
6324 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
6325                            struct kvm_memory_slot *dont)
6326 {
6327         int i;
6328
6329         for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
6330                 if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) {
6331                         kvm_kvfree(free->arch.rmap[i]);
6332                         free->arch.rmap[i] = NULL;
6333                 }
6334                 if (i == 0)
6335                         continue;
6336
6337                 if (!dont || free->arch.lpage_info[i - 1] !=
6338                              dont->arch.lpage_info[i - 1]) {
6339                         kvm_kvfree(free->arch.lpage_info[i - 1]);
6340                         free->arch.lpage_info[i - 1] = NULL;
6341                 }
6342         }
6343 }
6344
6345 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
6346 {
6347         int i;
6348
6349         for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
6350                 unsigned long ugfn;
6351                 int lpages;
6352                 int level = i + 1;
6353
6354                 lpages = gfn_to_index(slot->base_gfn + npages - 1,
6355                                       slot->base_gfn, level) + 1;
6356
6357                 slot->arch.rmap[i] =
6358                         kvm_kvzalloc(lpages * sizeof(*slot->arch.rmap[i]));
6359                 if (!slot->arch.rmap[i])
6360                         goto out_free;
6361                 if (i == 0)
6362                         continue;
6363
6364                 slot->arch.lpage_info[i - 1] = kvm_kvzalloc(lpages *
6365                                         sizeof(*slot->arch.lpage_info[i - 1]));
6366                 if (!slot->arch.lpage_info[i - 1])
6367                         goto out_free;
6368
6369                 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
6370                         slot->arch.lpage_info[i - 1][0].write_count = 1;
6371                 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
6372                         slot->arch.lpage_info[i - 1][lpages - 1].write_count = 1;
6373                 ugfn = slot->userspace_addr >> PAGE_SHIFT;
6374                 /*
6375                  * If the gfn and userspace address are not aligned wrt each
6376                  * other, or if explicitly asked to, disable large page
6377                  * support for this slot
6378                  */
6379                 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
6380                     !kvm_largepages_enabled()) {
6381                         unsigned long j;
6382
6383                         for (j = 0; j < lpages; ++j)
6384                                 slot->arch.lpage_info[i - 1][j].write_count = 1;
6385                 }
6386         }
6387
6388         return 0;
6389
6390 out_free:
6391         for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
6392                 kvm_kvfree(slot->arch.rmap[i]);
6393                 slot->arch.rmap[i] = NULL;
6394                 if (i == 0)
6395                         continue;
6396
6397                 kvm_kvfree(slot->arch.lpage_info[i - 1]);
6398                 slot->arch.lpage_info[i - 1] = NULL;
6399         }
6400         return -ENOMEM;
6401 }
6402
6403 int kvm_arch_prepare_memory_region(struct kvm *kvm,
6404                                 struct kvm_memory_slot *memslot,
6405                                 struct kvm_memory_slot old,
6406                                 struct kvm_userspace_memory_region *mem,
6407                                 int user_alloc)
6408 {
6409         int npages = memslot->npages;
6410         int map_flags = MAP_PRIVATE | MAP_ANONYMOUS;
6411
6412         /* Prevent internal slot pages from being moved by fork()/COW. */
6413         if (memslot->id >= KVM_MEMORY_SLOTS)
6414                 map_flags = MAP_SHARED | MAP_ANONYMOUS;
6415
6416         /*To keep backward compatibility with older userspace,
6417          *x86 needs to handle !user_alloc case.
6418          */
6419         if (!user_alloc) {
6420                 if (npages && !old.npages) {
6421                         unsigned long userspace_addr;
6422
6423                         userspace_addr = vm_mmap(NULL, 0,
6424                                                  npages * PAGE_SIZE,
6425                                                  PROT_READ | PROT_WRITE,
6426                                                  map_flags,
6427                                                  0);
6428
6429                         if (IS_ERR((void *)userspace_addr))
6430                                 return PTR_ERR((void *)userspace_addr);
6431
6432                         memslot->userspace_addr = userspace_addr;
6433                 }
6434         }
6435
6436
6437         return 0;
6438 }
6439
6440 void kvm_arch_commit_memory_region(struct kvm *kvm,
6441                                 struct kvm_userspace_memory_region *mem,
6442                                 struct kvm_memory_slot old,
6443                                 int user_alloc)
6444 {
6445
6446         int nr_mmu_pages = 0, npages = mem->memory_size >> PAGE_SHIFT;
6447
6448         if (!user_alloc && !old.user_alloc && old.npages && !npages) {
6449                 int ret;
6450
6451                 ret = vm_munmap(old.userspace_addr,
6452                                 old.npages * PAGE_SIZE);
6453                 if (ret < 0)
6454                         printk(KERN_WARNING
6455                                "kvm_vm_ioctl_set_memory_region: "
6456                                "failed to munmap memory\n");
6457         }
6458
6459         if (!kvm->arch.n_requested_mmu_pages)
6460                 nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
6461
6462         spin_lock(&kvm->mmu_lock);
6463         if (nr_mmu_pages)
6464                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
6465         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
6466         spin_unlock(&kvm->mmu_lock);
6467         /*
6468          * If memory slot is created, or moved, we need to clear all
6469          * mmio sptes.
6470          */
6471         if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT) {
6472                 kvm_mmu_zap_all(kvm);
6473                 kvm_reload_remote_mmus(kvm);
6474         }
6475 }
6476
6477 void kvm_arch_flush_shadow_all(struct kvm *kvm)
6478 {
6479         kvm_mmu_zap_all(kvm);
6480         kvm_reload_remote_mmus(kvm);
6481 }
6482
6483 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
6484                                    struct kvm_memory_slot *slot)
6485 {
6486         kvm_arch_flush_shadow_all(kvm);
6487 }
6488
6489 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
6490 {
6491         return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
6492                 !vcpu->arch.apf.halted)
6493                 || !list_empty_careful(&vcpu->async_pf.done)
6494                 || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
6495                 || atomic_read(&vcpu->arch.nmi_queued) ||
6496                 (kvm_arch_interrupt_allowed(vcpu) &&
6497                  kvm_cpu_has_interrupt(vcpu));
6498 }
6499
6500 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
6501 {
6502         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
6503 }
6504
6505 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
6506 {
6507         return kvm_x86_ops->interrupt_allowed(vcpu);
6508 }
6509
6510 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
6511 {
6512         unsigned long current_rip = kvm_rip_read(vcpu) +
6513                 get_segment_base(vcpu, VCPU_SREG_CS);
6514
6515         return current_rip == linear_rip;
6516 }
6517 EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
6518
6519 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
6520 {
6521         unsigned long rflags;
6522
6523         rflags = kvm_x86_ops->get_rflags(vcpu);
6524         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
6525                 rflags &= ~X86_EFLAGS_TF;
6526         return rflags;
6527 }
6528 EXPORT_SYMBOL_GPL(kvm_get_rflags);
6529
6530 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
6531 {
6532         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
6533             kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
6534                 rflags |= X86_EFLAGS_TF;
6535         kvm_x86_ops->set_rflags(vcpu, rflags);
6536         kvm_make_request(KVM_REQ_EVENT, vcpu);
6537 }
6538 EXPORT_SYMBOL_GPL(kvm_set_rflags);
6539
6540 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
6541 {
6542         int r;
6543
6544         if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) ||
6545               is_error_page(work->page))
6546                 return;
6547
6548         r = kvm_mmu_reload(vcpu);
6549         if (unlikely(r))
6550                 return;
6551
6552         if (!vcpu->arch.mmu.direct_map &&
6553               work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu))
6554                 return;
6555
6556         vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
6557 }
6558
6559 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
6560 {
6561         return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
6562 }
6563
6564 static inline u32 kvm_async_pf_next_probe(u32 key)
6565 {
6566         return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1);
6567 }
6568
6569 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6570 {
6571         u32 key = kvm_async_pf_hash_fn(gfn);
6572
6573         while (vcpu->arch.apf.gfns[key] != ~0)
6574                 key = kvm_async_pf_next_probe(key);
6575
6576         vcpu->arch.apf.gfns[key] = gfn;
6577 }
6578
6579 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
6580 {
6581         int i;
6582         u32 key = kvm_async_pf_hash_fn(gfn);
6583
6584         for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) &&
6585                      (vcpu->arch.apf.gfns[key] != gfn &&
6586                       vcpu->arch.apf.gfns[key] != ~0); i++)
6587                 key = kvm_async_pf_next_probe(key);
6588
6589         return key;
6590 }
6591
6592 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6593 {
6594         return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
6595 }
6596
6597 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6598 {
6599         u32 i, j, k;
6600
6601         i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
6602         while (true) {
6603                 vcpu->arch.apf.gfns[i] = ~0;
6604                 do {
6605                         j = kvm_async_pf_next_probe(j);
6606                         if (vcpu->arch.apf.gfns[j] == ~0)
6607                                 return;
6608                         k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
6609                         /*
6610                          * k lies cyclically in ]i,j]
6611                          * |    i.k.j |
6612                          * |....j i.k.| or  |.k..j i...|
6613                          */
6614                 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
6615                 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
6616                 i = j;
6617         }
6618 }
6619
6620 static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
6621 {
6622
6623         return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
6624                                       sizeof(val));
6625 }
6626
6627 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
6628                                      struct kvm_async_pf *work)
6629 {
6630         struct x86_exception fault;
6631
6632         trace_kvm_async_pf_not_present(work->arch.token, work->gva);
6633         kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
6634
6635         if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
6636             (vcpu->arch.apf.send_user_only &&
6637              kvm_x86_ops->get_cpl(vcpu) == 0))
6638                 kvm_make_request(KVM_REQ_APF_HALT, vcpu);
6639         else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
6640                 fault.vector = PF_VECTOR;
6641                 fault.error_code_valid = true;
6642                 fault.error_code = 0;
6643                 fault.nested_page_fault = false;
6644                 fault.address = work->arch.token;
6645                 kvm_inject_page_fault(vcpu, &fault);
6646         }
6647 }
6648
6649 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
6650                                  struct kvm_async_pf *work)
6651 {
6652         struct x86_exception fault;
6653
6654         trace_kvm_async_pf_ready(work->arch.token, work->gva);
6655         if (is_error_page(work->page))
6656                 work->arch.token = ~0; /* broadcast wakeup */
6657         else
6658                 kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
6659
6660         if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) &&
6661             !apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) {
6662                 fault.vector = PF_VECTOR;
6663                 fault.error_code_valid = true;
6664                 fault.error_code = 0;
6665                 fault.nested_page_fault = false;
6666                 fault.address = work->arch.token;
6667                 kvm_inject_page_fault(vcpu, &fault);
6668         }
6669         vcpu->arch.apf.halted = false;
6670         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
6671 }
6672
6673 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
6674 {
6675         if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED))
6676                 return true;
6677         else
6678                 return !kvm_event_needs_reinjection(vcpu) &&
6679                         kvm_x86_ops->interrupt_allowed(vcpu);
6680 }
6681
6682 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
6683 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
6684 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
6685 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
6686 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
6687 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
6688 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
6689 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
6690 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
6691 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
6692 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
6693 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);