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         if (irqchip_in_kernel(vcpu->kvm))
 250                 return vcpu->arch.apic_base;
 251         else
 252                 return vcpu->arch.apic_base;
 253 }
 254 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 255
 256 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 257 {
 258         /* TODO: reserve bits check */
 259         if (irqchip_in_kernel(vcpu->kvm))
 260                 kvm_lapic_set_base(vcpu, data);
 261         else
 262                 vcpu->arch.apic_base = data;
 263 }
 264 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 265
 266 #define EXCPT_BENIGN            0
 267 #define EXCPT_CONTRIBUTORY      1
 268 #define EXCPT_PF                2
 269
 270 static int exception_class(int vector)
 271 {
 272         switch (vector) {
 273         case PF_VECTOR:
 274                 return EXCPT_PF;
 275         case DE_VECTOR:
 276         case TS_VECTOR:
 277         case NP_VECTOR:
 278         case SS_VECTOR:
 279         case GP_VECTOR:
 280                 return EXCPT_CONTRIBUTORY;
 281         default:
 282                 break;
 283         }
 284         return EXCPT_BENIGN;
 285 }
 286
 287 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
 288                 unsigned nr, bool has_error, u32 error_code,
 289                 bool reinject)
 290 {
 291         u32 prev_nr;
 292         int class1, class2;
 293
 294         kvm_make_request(KVM_REQ_EVENT, vcpu);
 295
 296         if (!vcpu->arch.exception.pending) {
 297         queue:
 298                 vcpu->arch.exception.pending = true;
 299                 vcpu->arch.exception.has_error_code = has_error;
 300                 vcpu->arch.exception.nr = nr;
 301                 vcpu->arch.exception.error_code = error_code;
 302                 vcpu->arch.exception.reinject = reinject;
 303                 return;
 304         }
 305
 306         /* to check exception */
 307         prev_nr = vcpu->arch.exception.nr;
 308         if (prev_nr == DF_VECTOR) {
 309                 /* triple fault -> shutdown */
 310                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
 311                 return;
 312         }
 313         class1 = exception_class(prev_nr);
 314         class2 = exception_class(nr);
 315         if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
 316                 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
 317                 /* generate double fault per SDM Table 5-5 */
 318                 vcpu->arch.exception.pending = true;
 319                 vcpu->arch.exception.has_error_code = true;
 320                 vcpu->arch.exception.nr = DF_VECTOR;
 321                 vcpu->arch.exception.error_code = 0;
 322         } else
 323                 /* replace previous exception with a new one in a hope
 324                    that instruction re-execution will regenerate lost
 325                    exception */
 326                 goto queue;
 327 }
 328
 329 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 330 {
 331         kvm_multiple_exception(vcpu, nr, false, 0, false);
 332 }
 333 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 334
 335 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 336 {
 337         kvm_multiple_exception(vcpu, nr, false, 0, true);
 338 }
 339 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
 340
 341 void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
 342 {
 343         if (err)
 344                 kvm_inject_gp(vcpu, 0);
 345         else
 346                 kvm_x86_ops->skip_emulated_instruction(vcpu);
 347 }
 348 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
 349
 350 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
 351 {
 352         ++vcpu->stat.pf_guest;
 353         vcpu->arch.cr2 = fault->address;
 354         kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);
 355 }
 356 EXPORT_SYMBOL_GPL(kvm_inject_page_fault);
 357
 358 void kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
 359 {
 360         if (mmu_is_nested(vcpu) && !fault->nested_page_fault)
 361                 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault);
 362         else
 363                 vcpu->arch.mmu.inject_page_fault(vcpu, fault);
 364 }
 365
 366 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
 367 {
 368         atomic_inc(&vcpu->arch.nmi_queued);
 369         kvm_make_request(KVM_REQ_NMI, vcpu);
 370 }
 371 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
 372
 373 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 374 {
 375         kvm_multiple_exception(vcpu, nr, true, error_code, false);
 376 }
 377 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 378
 379 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 380 {
 381         kvm_multiple_exception(vcpu, nr, true, error_code, true);
 382 }
 383 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
 384
 385 /*
 386  * Checks if cpl <= required_cpl; if true, return true.  Otherwise queue
 387  * a #GP and return false.
 388  */
 389 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
 390 {
 391         if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
 392                 return true;
 393         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
 394         return false;
 395 }
 396 EXPORT_SYMBOL_GPL(kvm_require_cpl);
 397
 398 /*
 399  * This function will be used to read from the physical memory of the currently
 400  * running guest. The difference to kvm_read_guest_page is that this function
 401  * can read from guest physical or from the guest's guest physical memory.
 402  */
 403 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 404                             gfn_t ngfn, void *data, int offset, int len,
 405                             u32 access)
 406 {
 407         gfn_t real_gfn;
 408         gpa_t ngpa;
 409
 410         ngpa     = gfn_to_gpa(ngfn);
 411         real_gfn = mmu->translate_gpa(vcpu, ngpa, access);
 412         if (real_gfn == UNMAPPED_GVA)
 413                 return -EFAULT;
 414
 415         real_gfn = gpa_to_gfn(real_gfn);
 416
 417         return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
 418 }
 419 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
 420
 421 int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
 422                                void *data, int offset, int len, u32 access)
 423 {
 424         return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
 425                                        data, offset, len, access);
 426 }
 427
 428 /*
 429  * Load the pae pdptrs.  Return true is they are all valid.
 430  */
 431 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
 432 {
 433         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 434         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 435         int i;
 436         int ret;
 437         u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
 438
 439         ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
 440                                       offset * sizeof(u64), sizeof(pdpte),
 441                                       PFERR_USER_MASK|PFERR_WRITE_MASK);
 442         if (ret < 0) {
 443                 ret = 0;
 444                 goto out;
 445         }
 446         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 447                 if (is_present_gpte(pdpte[i]) &&
 448                     (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
 449                         ret = 0;
 450                         goto out;
 451                 }
 452         }
 453         ret = 1;
 454
 455         memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
 456         __set_bit(VCPU_EXREG_PDPTR,
 457                   (unsigned long *)&vcpu->arch.regs_avail);
 458         __set_bit(VCPU_EXREG_PDPTR,
 459                   (unsigned long *)&vcpu->arch.regs_dirty);
 460 out:
 461
 462         return ret;
 463 }
 464 EXPORT_SYMBOL_GPL(load_pdptrs);
 465
 466 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 467 {
 468         u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
 469         bool changed = true;
 470         int offset;
 471         gfn_t gfn;
 472         int r;
 473
 474         if (is_long_mode(vcpu) || !is_pae(vcpu))
 475                 return false;
 476
 477         if (!test_bit(VCPU_EXREG_PDPTR,
 478                       (unsigned long *)&vcpu->arch.regs_avail))
 479                 return true;
 480
 481         gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
 482         offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
 483         r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
 484                                        PFERR_USER_MASK | PFERR_WRITE_MASK);
 485         if (r < 0)
 486                 goto out;
 487         changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
 488 out:
 489
 490         return changed;
 491 }
 492
 493 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 494 {
 495         unsigned long old_cr0 = kvm_read_cr0(vcpu);
 496         unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
 497                                     X86_CR0_CD | X86_CR0_NW;
 498
 499         cr0 |= X86_CR0_ET;
 500
 501 #ifdef CONFIG_X86_64
 502         if (cr0 & 0xffffffff00000000UL)
 503                 return 1;
 504 #endif
 505
 506         cr0 &= ~CR0_RESERVED_BITS;
 507
 508         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
 509                 return 1;
 510
 511         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
 512                 return 1;
 513
 514         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 515 #ifdef CONFIG_X86_64
 516                 if ((vcpu->arch.efer & EFER_LME)) {
 517                         int cs_db, cs_l;
 518
 519                         if (!is_pae(vcpu))
 520                                 return 1;
 521                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 522                         if (cs_l)
 523                                 return 1;
 524                 } else
 525 #endif
 526                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
 527                                                  kvm_read_cr3(vcpu)))
 528                         return 1;
 529         }
 530
 531         kvm_x86_ops->set_cr0(vcpu, cr0);
 532
 533         if ((cr0 ^ old_cr0) & X86_CR0_PG) {
 534                 kvm_clear_async_pf_completion_queue(vcpu);
 535                 kvm_async_pf_hash_reset(vcpu);
 536         }
 537
 538         if ((cr0 ^ old_cr0) & update_bits)
 539                 kvm_mmu_reset_context(vcpu);
 540         return 0;
 541 }
 542 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 543
 544 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 545 {
 546         (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
 547 }
 548 EXPORT_SYMBOL_GPL(kvm_lmsw);
 549
 550 int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 551 {
 552         u64 xcr0;
 553
 554         /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now  */
 555         if (index != XCR_XFEATURE_ENABLED_MASK)
 556                 return 1;
 557         xcr0 = xcr;
 558         if (kvm_x86_ops->get_cpl(vcpu) != 0)
 559                 return 1;
 560         if (!(xcr0 & XSTATE_FP))
 561                 return 1;
 562         if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
 563                 return 1;
 564         if (xcr0 & ~host_xcr0)
 565                 return 1;
 566         vcpu->arch.xcr0 = xcr0;
 567         vcpu->guest_xcr0_loaded = 0;
 568         return 0;
 569 }
 570
 571 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 572 {
 573         if (__kvm_set_xcr(vcpu, index, xcr)) {
 574                 kvm_inject_gp(vcpu, 0);
 575                 return 1;
 576         }
 577         return 0;
 578 }
 579 EXPORT_SYMBOL_GPL(kvm_set_xcr);
 580
 581 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 582 {
 583         unsigned long old_cr4 = kvm_read_cr4(vcpu);
 584         unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE |
 585                                    X86_CR4_PAE | X86_CR4_SMEP;
 586         if (cr4 & CR4_RESERVED_BITS)
 587                 return 1;
 588
 589         if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE))
 590                 return 1;
 591
 592         if (!guest_cpuid_has_smep(vcpu) && (cr4 & X86_CR4_SMEP))
 593                 return 1;
 594
 595         if (!guest_cpuid_has_fsgsbase(vcpu) && (cr4 & X86_CR4_RDWRGSFS))
 596                 return 1;
 597
 598         if (is_long_mode(vcpu)) {
 599                 if (!(cr4 & X86_CR4_PAE))
 600                         return 1;
 601         } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
 602                    && ((cr4 ^ old_cr4) & pdptr_bits)
 603                    && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
 604                                    kvm_read_cr3(vcpu)))
 605                 return 1;
 606
 607         if (kvm_x86_ops->set_cr4(vcpu, cr4))
 608                 return 1;
 609
 610         if ((cr4 ^ old_cr4) & pdptr_bits)
 611                 kvm_mmu_reset_context(vcpu);
 612
 613         if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
 614                 kvm_update_cpuid(vcpu);
 615
 616         return 0;
 617 }
 618 EXPORT_SYMBOL_GPL(kvm_set_cr4);
 619
 620 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 621 {
 622         if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) {
 623                 kvm_mmu_sync_roots(vcpu);
 624                 kvm_mmu_flush_tlb(vcpu);
 625                 return 0;
 626         }
 627
 628         if (is_long_mode(vcpu)) {
 629                 if (cr3 & CR3_L_MODE_RESERVED_BITS)
 630                         return 1;
 631         } else {
 632                 if (is_pae(vcpu)) {
 633                         if (cr3 & CR3_PAE_RESERVED_BITS)
 634                                 return 1;
 635                         if (is_paging(vcpu) &&
 636                             !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
 637                                 return 1;
 638                 }
 639                 /*
 640                  * We don't check reserved bits in nonpae mode, because
 641                  * this isn't enforced, and VMware depends on this.
 642                  */
 643         }
 644
 645         /*
 646          * Does the new cr3 value map to physical memory? (Note, we
 647          * catch an invalid cr3 even in real-mode, because it would
 648          * cause trouble later on when we turn on paging anyway.)
 649          *
 650          * A real CPU would silently accept an invalid cr3 and would
 651          * attempt to use it - with largely undefined (and often hard
 652          * to debug) behavior on the guest side.
 653          */
 654         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 655                 return 1;
 656         vcpu->arch.cr3 = cr3;
 657         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
 658         vcpu->arch.mmu.new_cr3(vcpu);
 659         return 0;
 660 }
 661 EXPORT_SYMBOL_GPL(kvm_set_cr3);
 662
 663 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 664 {
 665         if (cr8 & CR8_RESERVED_BITS)
 666                 return 1;
 667         if (irqchip_in_kernel(vcpu->kvm))
 668                 kvm_lapic_set_tpr(vcpu, cr8);
 669         else
 670                 vcpu->arch.cr8 = cr8;
 671         return 0;
 672 }
 673 EXPORT_SYMBOL_GPL(kvm_set_cr8);
 674
 675 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
 676 {
 677         if (irqchip_in_kernel(vcpu->kvm))
 678                 return kvm_lapic_get_cr8(vcpu);
 679         else
 680                 return vcpu->arch.cr8;
 681 }
 682 EXPORT_SYMBOL_GPL(kvm_get_cr8);
 683
 684 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 685 {
 686         switch (dr) {
 687         case 0 ... 3:
 688                 vcpu->arch.db[dr] = val;
 689                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
 690                         vcpu->arch.eff_db[dr] = val;
 691                 break;
 692         case 4:
 693                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 694                         return 1; /* #UD */
 695                 /* fall through */
 696         case 6:
 697                 if (val & 0xffffffff00000000ULL)
 698                         return -1; /* #GP */
 699                 vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
 700                 break;
 701         case 5:
 702                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 703                         return 1; /* #UD */
 704                 /* fall through */
 705         default: /* 7 */
 706                 if (val & 0xffffffff00000000ULL)
 707                         return -1; /* #GP */
 708                 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
 709                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
 710                         kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7);
 711                         vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK);
 712                 }
 713                 break;
 714         }
 715
 716         return 0;
 717 }
 718
 719 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 720 {
 721         int res;
 722
 723         res = __kvm_set_dr(vcpu, dr, val);
 724         if (res > 0)
 725                 kvm_queue_exception(vcpu, UD_VECTOR);
 726         else if (res < 0)
 727                 kvm_inject_gp(vcpu, 0);
 728
 729         return res;
 730 }
 731 EXPORT_SYMBOL_GPL(kvm_set_dr);
 732
 733 static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 734 {
 735         switch (dr) {
 736         case 0 ... 3:
 737                 *val = vcpu->arch.db[dr];
 738                 break;
 739         case 4:
 740                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 741                         return 1;
 742                 /* fall through */
 743         case 6:
 744                 *val = vcpu->arch.dr6;
 745                 break;
 746         case 5:
 747                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 748                         return 1;
 749                 /* fall through */
 750         default: /* 7 */
 751                 *val = vcpu->arch.dr7;
 752                 break;
 753         }
 754
 755         return 0;
 756 }
 757
 758 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 759 {
 760         if (_kvm_get_dr(vcpu, dr, val)) {
 761                 kvm_queue_exception(vcpu, UD_VECTOR);
 762                 return 1;
 763         }
 764         return 0;
 765 }
 766 EXPORT_SYMBOL_GPL(kvm_get_dr);
 767
 768 bool kvm_rdpmc(struct kvm_vcpu *vcpu)
 769 {
 770         u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
 771         u64 data;
 772         int err;
 773
 774         err = kvm_pmu_read_pmc(vcpu, ecx, &data);
 775         if (err)
 776                 return err;
 777         kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data);
 778         kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32);
 779         return err;
 780 }
 781 EXPORT_SYMBOL_GPL(kvm_rdpmc);
 782
 783 /*
 784  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 785  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 786  *
 787  * This list is modified at module load time to reflect the
 788  * capabilities of the host cpu. This capabilities test skips MSRs that are
 789  * kvm-specific. Those are put in the beginning of the list.
 790  */
 791
 792 #define KVM_SAVE_MSRS_BEGIN     9
 793 static u32 msrs_to_save[] = {
 794         MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
 795         MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
 796         HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
 797         HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
 798         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
 799         MSR_STAR,
 800 #ifdef CONFIG_X86_64
 801         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
 802 #endif
 803         MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
 804 };
 805
 806 static unsigned num_msrs_to_save;
 807
 808 static u32 emulated_msrs[] = {
 809         MSR_IA32_TSCDEADLINE,
 810         MSR_IA32_MISC_ENABLE,
 811         MSR_IA32_MCG_STATUS,
 812         MSR_IA32_MCG_CTL,
 813 };
 814
 815 static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
 816 {
 817         u64 old_efer = vcpu->arch.efer;
 818
 819         if (efer & efer_reserved_bits)
 820                 return 1;
 821
 822         if (is_paging(vcpu)
 823             && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
 824                 return 1;
 825
 826         if (efer & EFER_FFXSR) {
 827                 struct kvm_cpuid_entry2 *feat;
 828
 829                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 830                 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
 831                         return 1;
 832         }
 833
 834         if (efer & EFER_SVME) {
 835                 struct kvm_cpuid_entry2 *feat;
 836
 837                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 838                 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
 839                         return 1;
 840         }
 841
 842         efer &= ~EFER_LMA;
 843         efer |= vcpu->arch.efer & EFER_LMA;
 844
 845         kvm_x86_ops->set_efer(vcpu, efer);
 846
 847         vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
 848
 849         /* Update reserved bits */
 850         if ((efer ^ old_efer) & EFER_NX)
 851                 kvm_mmu_reset_context(vcpu);
 852
 853         return 0;
 854 }
 855
 856 void kvm_enable_efer_bits(u64 mask)
 857 {
 858        efer_reserved_bits &= ~mask;
 859 }
 860 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
 861
 862
 863 /*
 864  * Writes msr value into into the appropriate "register".
 865  * Returns 0 on success, non-0 otherwise.
 866  * Assumes vcpu_load() was already called.
 867  */
 868 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 869 {
 870         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 871 }
 872
 873 /*
 874  * Adapt set_msr() to msr_io()'s calling convention
 875  */
 876 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 877 {
 878         return kvm_set_msr(vcpu, index, *data);
 879 }
 880
 881 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 882 {
 883         int version;
 884         int r;
 885         struct pvclock_wall_clock wc;
 886         struct timespec boot;
 887
 888         if (!wall_clock)
 889                 return;
 890
 891         r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
 892         if (r)
 893                 return;
 894
 895         if (version & 1)
 896                 ++version;  /* first time write, random junk */
 897
 898         ++version;
 899
 900         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 901
 902         /*
 903          * The guest calculates current wall clock time by adding
 904          * system time (updated by kvm_guest_time_update below) to the
 905          * wall clock specified here.  guest system time equals host
 906          * system time for us, thus we must fill in host boot time here.
 907          */
 908         getboottime(&boot);
 909
 910         wc.sec = boot.tv_sec;
 911         wc.nsec = boot.tv_nsec;
 912         wc.version = version;
 913
 914         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
 915
 916         version++;
 917         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 918 }
 919
 920 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
 921 {
 922         uint32_t quotient, remainder;
 923
 924         /* Don't try to replace with do_div(), this one calculates
 925          * "(dividend << 32) / divisor" */
 926         __asm__ ( "divl %4"
 927                   : "=a" (quotient), "=d" (remainder)
 928                   : "0" (0), "1" (dividend), "r" (divisor) );
 929         return quotient;
 930 }
 931
 932 static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
 933                                s8 *pshift, u32 *pmultiplier)
 934 {
 935         uint64_t scaled64;
 936         int32_t  shift = 0;
 937         uint64_t tps64;
 938         uint32_t tps32;
 939
 940         tps64 = base_khz * 1000LL;
 941         scaled64 = scaled_khz * 1000LL;
 942         while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
 943                 tps64 >>= 1;
 944                 shift--;
 945         }
 946
 947         tps32 = (uint32_t)tps64;
 948         while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
 949                 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
 950                         scaled64 >>= 1;
 951                 else
 952                         tps32 <<= 1;
 953                 shift++;
 954         }
 955
 956         *pshift = shift;
 957         *pmultiplier = div_frac(scaled64, tps32);
 958
 959         pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
 960                  __func__, base_khz, scaled_khz, shift, *pmultiplier);
 961 }
 962
 963 static inline u64 get_kernel_ns(void)
 964 {
 965         struct timespec ts;
 966
 967         WARN_ON(preemptible());
 968         ktime_get_ts(&ts);
 969         monotonic_to_bootbased(&ts);
 970         return timespec_to_ns(&ts);
 971 }
 972
 973 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
 974 unsigned long max_tsc_khz;
 975
 976 static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
 977 {
 978         return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult,
 979                                    vcpu->arch.virtual_tsc_shift);
 980 }
 981
 982 static u32 adjust_tsc_khz(u32 khz, s32 ppm)
 983 {
 984         u64 v = (u64)khz * (1000000 + ppm);
 985         do_div(v, 1000000);
 986         return v;
 987 }
 988
 989 static void kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 this_tsc_khz)
 990 {
 991         u32 thresh_lo, thresh_hi;
 992         int use_scaling = 0;
 993
 994         /* Compute a scale to convert nanoseconds in TSC cycles */
 995         kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
 996                            &vcpu->arch.virtual_tsc_shift,
 997                            &vcpu->arch.virtual_tsc_mult);
 998         vcpu->arch.virtual_tsc_khz = this_tsc_khz;
 999
1000         /*
1001          * Compute the variation in TSC rate which is acceptable
1002          * within the range of tolerance and decide if the
1003          * rate being applied is within that bounds of the hardware
1004          * rate.  If so, no scaling or compensation need be done.
1005          */
1006         thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm);
1007         thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm);
1008         if (this_tsc_khz < thresh_lo || this_tsc_khz > thresh_hi) {
1009                 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", this_tsc_khz, thresh_lo, thresh_hi);
1010                 use_scaling = 1;
1011         }
1012         kvm_x86_ops->set_tsc_khz(vcpu, this_tsc_khz, use_scaling);
1013 }
1014
1015 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
1016 {
1017         u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec,
1018                                       vcpu->arch.virtual_tsc_mult,
1019                                       vcpu->arch.virtual_tsc_shift);
1020         tsc += vcpu->arch.this_tsc_write;
1021         return tsc;
1022 }
1023
1024 void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data)
1025 {
1026         struct kvm *kvm = vcpu->kvm;
1027         u64 offset, ns, elapsed;
1028         unsigned long flags;
1029         s64 usdiff;
1030
1031         raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
1032         offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
1033         ns = get_kernel_ns();
1034         elapsed = ns - kvm->arch.last_tsc_nsec;
1035
1036         /* n.b - signed multiplication and division required */
1037         usdiff = data - kvm->arch.last_tsc_write;
1038 #ifdef CONFIG_X86_64
1039         usdiff = (usdiff * 1000) / vcpu->arch.virtual_tsc_khz;
1040 #else
1041         /* do_div() only does unsigned */
1042         asm("idivl %2; xor %%edx, %%edx"
1043             : "=A"(usdiff)
1044             : "A"(usdiff * 1000), "rm"(vcpu->arch.virtual_tsc_khz));
1045 #endif
1046         do_div(elapsed, 1000);
1047         usdiff -= elapsed;
1048         if (usdiff < 0)
1049                 usdiff = -usdiff;
1050
1051         /*
1052          * Special case: TSC write with a small delta (1 second) of virtual
1053          * cycle time against real time is interpreted as an attempt to
1054          * synchronize the CPU.
1055          *
1056          * For a reliable TSC, we can match TSC offsets, and for an unstable
1057          * TSC, we add elapsed time in this computation.  We could let the
1058          * compensation code attempt to catch up if we fall behind, but
1059          * it's better to try to match offsets from the beginning.
1060          */
1061         if (usdiff < USEC_PER_SEC &&
1062             vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) {
1063                 if (!check_tsc_unstable()) {
1064                         offset = kvm->arch.cur_tsc_offset;
1065                         pr_debug("kvm: matched tsc offset for %llu\n", data);
1066                 } else {
1067                         u64 delta = nsec_to_cycles(vcpu, elapsed);
1068                         data += delta;
1069                         offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
1070                         pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
1071                 }
1072         } else {
1073                 /*
1074                  * We split periods of matched TSC writes into generations.
1075                  * For each generation, we track the original measured
1076                  * nanosecond time, offset, and write, so if TSCs are in
1077                  * sync, we can match exact offset, and if not, we can match
1078                  * exact software computaion in compute_guest_tsc()
1079                  *
1080                  * These values are tracked in kvm->arch.cur_xxx variables.
1081                  */
1082                 kvm->arch.cur_tsc_generation++;
1083                 kvm->arch.cur_tsc_nsec = ns;
1084                 kvm->arch.cur_tsc_write = data;
1085                 kvm->arch.cur_tsc_offset = offset;
1086                 pr_debug("kvm: new tsc generation %u, clock %llu\n",
1087                          kvm->arch.cur_tsc_generation, data);
1088         }
1089
1090         /*
1091          * We also track th most recent recorded KHZ, write and time to
1092          * allow the matching interval to be extended at each write.
1093          */
1094         kvm->arch.last_tsc_nsec = ns;
1095         kvm->arch.last_tsc_write = data;
1096         kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz;
1097
1098         /* Reset of TSC must disable overshoot protection below */
1099         vcpu->arch.hv_clock.tsc_timestamp = 0;
1100         vcpu->arch.last_guest_tsc = data;
1101
1102         /* Keep track of which generation this VCPU has synchronized to */
1103         vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation;
1104         vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec;
1105         vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write;
1106
1107         kvm_x86_ops->write_tsc_offset(vcpu, offset);
1108         raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
1109 }
1110
1111 EXPORT_SYMBOL_GPL(kvm_write_tsc);
1112
1113 static int kvm_guest_time_update(struct kvm_vcpu *v)
1114 {
1115         unsigned long flags;
1116         struct kvm_vcpu_arch *vcpu = &v->arch;
1117         void *shared_kaddr;
1118         unsigned long this_tsc_khz;
1119         s64 kernel_ns, max_kernel_ns;
1120         u64 tsc_timestamp;
1121
1122         /* Keep irq disabled to prevent changes to the clock */
1123         local_irq_save(flags);
1124         tsc_timestamp = kvm_x86_ops->read_l1_tsc(v);
1125         kernel_ns = get_kernel_ns();
1126         this_tsc_khz = __get_cpu_var(cpu_tsc_khz);
1127         if (unlikely(this_tsc_khz == 0)) {
1128                 local_irq_restore(flags);
1129                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
1130                 return 1;
1131         }
1132
1133         /*
1134          * We may have to catch up the TSC to match elapsed wall clock
1135          * time for two reasons, even if kvmclock is used.
1136          *   1) CPU could have been running below the maximum TSC rate
1137          *   2) Broken TSC compensation resets the base at each VCPU
1138          *      entry to avoid unknown leaps of TSC even when running
1139          *      again on the same CPU.  This may cause apparent elapsed
1140          *      time to disappear, and the guest to stand still or run
1141          *      very slowly.
1142          */
1143         if (vcpu->tsc_catchup) {
1144                 u64 tsc = compute_guest_tsc(v, kernel_ns);
1145                 if (tsc > tsc_timestamp) {
1146                         adjust_tsc_offset_guest(v, tsc - tsc_timestamp);
1147                         tsc_timestamp = tsc;
1148                 }
1149         }
1150
1151         local_irq_restore(flags);
1152
1153         if (!vcpu->time_page)
1154                 return 0;
1155
1156         /*
1157          * Time as measured by the TSC may go backwards when resetting the base
1158          * tsc_timestamp.  The reason for this is that the TSC resolution is
1159          * higher than the resolution of the other clock scales.  Thus, many
1160          * possible measurments of the TSC correspond to one measurement of any
1161          * other clock, and so a spread of values is possible.  This is not a
1162          * problem for the computation of the nanosecond clock; with TSC rates
1163          * around 1GHZ, there can only be a few cycles which correspond to one
1164          * nanosecond value, and any path through this code will inevitably
1165          * take longer than that.  However, with the kernel_ns value itself,
1166          * the precision may be much lower, down to HZ granularity.  If the
1167          * first sampling of TSC against kernel_ns ends in the low part of the
1168          * range, and the second in the high end of the range, we can get:
1169          *
1170          * (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new
1171          *
1172          * As the sampling errors potentially range in the thousands of cycles,
1173          * it is possible such a time value has already been observed by the
1174          * guest.  To protect against this, we must compute the system time as
1175          * observed by the guest and ensure the new system time is greater.
1176          */
1177         max_kernel_ns = 0;
1178         if (vcpu->hv_clock.tsc_timestamp) {
1179                 max_kernel_ns = vcpu->last_guest_tsc -
1180                                 vcpu->hv_clock.tsc_timestamp;
1181                 max_kernel_ns = pvclock_scale_delta(max_kernel_ns,
1182                                     vcpu->hv_clock.tsc_to_system_mul,
1183                                     vcpu->hv_clock.tsc_shift);
1184                 max_kernel_ns += vcpu->last_kernel_ns;
1185         }
1186
1187         if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
1188                 kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
1189                                    &vcpu->hv_clock.tsc_shift,
1190                                    &vcpu->hv_clock.tsc_to_system_mul);
1191                 vcpu->hw_tsc_khz = this_tsc_khz;
1192         }
1193
1194         if (max_kernel_ns > kernel_ns)
1195                 kernel_ns = max_kernel_ns;
1196
1197         /* With all the info we got, fill in the values */
1198         vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
1199         vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
1200         vcpu->last_kernel_ns = kernel_ns;
1201         vcpu->last_guest_tsc = tsc_timestamp;
1202         vcpu->hv_clock.flags = 0;
1203
1204         /*
1205          * The interface expects us to write an even number signaling that the
1206          * update is finished. Since the guest won't see the intermediate
1207          * state, we just increase by 2 at the end.
1208          */
1209         vcpu->hv_clock.version += 2;
1210
1211         shared_kaddr = kmap_atomic(vcpu->time_page);
1212
1213         memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
1214                sizeof(vcpu->hv_clock));
1215
1216         kunmap_atomic(shared_kaddr);
1217
1218         mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
1219         return 0;
1220 }
1221
1222 static bool msr_mtrr_valid(unsigned msr)
1223 {
1224         switch (msr) {
1225         case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
1226         case MSR_MTRRfix64K_00000:
1227         case MSR_MTRRfix16K_80000:
1228         case MSR_MTRRfix16K_A0000:
1229         case MSR_MTRRfix4K_C0000:
1230         case MSR_MTRRfix4K_C8000:
1231         case MSR_MTRRfix4K_D0000:
1232         case MSR_MTRRfix4K_D8000:
1233         case MSR_MTRRfix4K_E0000:
1234         case MSR_MTRRfix4K_E8000:
1235         case MSR_MTRRfix4K_F0000:
1236         case MSR_MTRRfix4K_F8000:
1237         case MSR_MTRRdefType:
1238         case MSR_IA32_CR_PAT:
1239                 return true;
1240         case 0x2f8:
1241                 return true;
1242         }
1243         return false;
1244 }
1245
1246 static bool valid_pat_type(unsigned t)
1247 {
1248         return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
1249 }
1250
1251 static bool valid_mtrr_type(unsigned t)
1252 {
1253         return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
1254 }
1255
1256 static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1257 {
1258         int i;
1259
1260         if (!msr_mtrr_valid(msr))
1261                 return false;
1262
1263         if (msr == MSR_IA32_CR_PAT) {
1264                 for (i = 0; i < 8; i++)
1265                         if (!valid_pat_type((data >> (i * 8)) & 0xff))
1266                                 return false;
1267                 return true;
1268         } else if (msr == MSR_MTRRdefType) {
1269                 if (data & ~0xcff)
1270                         return false;
1271                 return valid_mtrr_type(data & 0xff);
1272         } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
1273                 for (i = 0; i < 8 ; i++)
1274                         if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
1275                                 return false;
1276                 return true;
1277         }
1278
1279         /* variable MTRRs */
1280         return valid_mtrr_type(data & 0xff);
1281 }
1282
1283 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1284 {
1285         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1286
1287         if (!mtrr_valid(vcpu, msr, data))
1288                 return 1;
1289
1290         if (msr == MSR_MTRRdefType) {
1291                 vcpu->arch.mtrr_state.def_type = data;
1292                 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
1293         } else if (msr == MSR_MTRRfix64K_00000)
1294                 p[0] = data;
1295         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1296                 p[1 + msr - MSR_MTRRfix16K_80000] = data;
1297         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1298                 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
1299         else if (msr == MSR_IA32_CR_PAT)
1300                 vcpu->arch.pat = data;
1301         else {  /* Variable MTRRs */
1302                 int idx, is_mtrr_mask;
1303                 u64 *pt;
1304
1305                 idx = (msr - 0x200) / 2;
1306                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1307                 if (!is_mtrr_mask)
1308                         pt =
1309                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1310                 else
1311                         pt =
1312                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1313                 *pt = data;
1314         }
1315
1316         kvm_mmu_reset_context(vcpu);
1317         return 0;
1318 }
1319
1320 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1321 {
1322         u64 mcg_cap = vcpu->arch.mcg_cap;
1323         unsigned bank_num = mcg_cap & 0xff;
1324
1325         switch (msr) {
1326         case MSR_IA32_MCG_STATUS:
1327                 vcpu->arch.mcg_status = data;
1328                 break;
1329         case MSR_IA32_MCG_CTL:
1330                 if (!(mcg_cap & MCG_CTL_P))
1331                         return 1;
1332                 if (data != 0 && data != ~(u64)0)
1333                         return -1;
1334                 vcpu->arch.mcg_ctl = data;
1335                 break;
1336         default:
1337                 if (msr >= MSR_IA32_MC0_CTL &&
1338                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1339                         u32 offset = msr - MSR_IA32_MC0_CTL;
1340                         /* only 0 or all 1s can be written to IA32_MCi_CTL
1341                          * some Linux kernels though clear bit 10 in bank 4 to
1342                          * workaround a BIOS/GART TBL issue on AMD K8s, ignore
1343                          * this to avoid an uncatched #GP in the guest
1344                          */
1345                         if ((offset & 0x3) == 0 &&
1346                             data != 0 && (data | (1 << 10)) != ~(u64)0)
1347                                 return -1;
1348                         vcpu->arch.mce_banks[offset] = data;
1349                         break;
1350                 }
1351                 return 1;
1352         }
1353         return 0;
1354 }
1355
1356 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
1357 {
1358         struct kvm *kvm = vcpu->kvm;
1359         int lm = is_long_mode(vcpu);
1360         u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
1361                 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
1362         u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
1363                 : kvm->arch.xen_hvm_config.blob_size_32;
1364         u32 page_num = data & ~PAGE_MASK;
1365         u64 page_addr = data & PAGE_MASK;
1366         u8 *page;
1367         int r;
1368
1369         r = -E2BIG;
1370         if (page_num >= blob_size)
1371                 goto out;
1372         r = -ENOMEM;
1373         page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE);
1374         if (IS_ERR(page)) {
1375                 r = PTR_ERR(page);
1376                 goto out;
1377         }
1378         if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
1379                 goto out_free;
1380         r = 0;
1381 out_free:
1382         kfree(page);
1383 out:
1384         return r;
1385 }
1386
1387 static bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1388 {
1389         return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1390 }
1391
1392 static bool kvm_hv_msr_partition_wide(u32 msr)
1393 {
1394         bool r = false;
1395         switch (msr) {
1396         case HV_X64_MSR_GUEST_OS_ID:
1397         case HV_X64_MSR_HYPERCALL:
1398                 r = true;
1399                 break;
1400         }
1401
1402         return r;
1403 }
1404
1405 static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1406 {
1407         struct kvm *kvm = vcpu->kvm;
1408
1409         switch (msr) {
1410         case HV_X64_MSR_GUEST_OS_ID:
1411                 kvm->arch.hv_guest_os_id = data;
1412                 /* setting guest os id to zero disables hypercall page */
1413                 if (!kvm->arch.hv_guest_os_id)
1414                         kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1415                 break;
1416         case HV_X64_MSR_HYPERCALL: {
1417                 u64 gfn;
1418                 unsigned long addr;
1419                 u8 instructions[4];
1420
1421                 /* if guest os id is not set hypercall should remain disabled */
1422                 if (!kvm->arch.hv_guest_os_id)
1423                         break;
1424                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1425                         kvm->arch.hv_hypercall = data;
1426                         break;
1427                 }
1428                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1429                 addr = gfn_to_hva(kvm, gfn);
1430                 if (kvm_is_error_hva(addr))
1431                         return 1;
1432                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
1433                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
1434                 if (__copy_to_user((void __user *)addr, instructions, 4))
1435                         return 1;
1436                 kvm->arch.hv_hypercall = data;
1437                 break;
1438         }
1439         default:
1440                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1441                           "data 0x%llx\n", msr, data);
1442                 return 1;
1443         }
1444         return 0;
1445 }
1446
1447 static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1448 {
1449         switch (msr) {
1450         case HV_X64_MSR_APIC_ASSIST_PAGE: {
1451                 unsigned long addr;
1452
1453                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
1454                         vcpu->arch.hv_vapic = data;
1455                         break;
1456                 }
1457                 addr = gfn_to_hva(vcpu->kvm, data >>
1458                                   HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
1459                 if (kvm_is_error_hva(addr))
1460                         return 1;
1461                 if (__clear_user((void __user *)addr, PAGE_SIZE))
1462                         return 1;
1463                 vcpu->arch.hv_vapic = data;
1464                 break;
1465         }
1466         case HV_X64_MSR_EOI:
1467                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1468         case HV_X64_MSR_ICR:
1469                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1470         case HV_X64_MSR_TPR:
1471                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1472         default:
1473                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1474                           "data 0x%llx\n", msr, data);
1475                 return 1;
1476         }
1477
1478         return 0;
1479 }
1480
1481 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
1482 {
1483         gpa_t gpa = data & ~0x3f;
1484
1485         /* Bits 2:5 are resrved, Should be zero */
1486         if (data & 0x3c)
1487                 return 1;
1488
1489         vcpu->arch.apf.msr_val = data;
1490
1491         if (!(data & KVM_ASYNC_PF_ENABLED)) {
1492                 kvm_clear_async_pf_completion_queue(vcpu);
1493                 kvm_async_pf_hash_reset(vcpu);
1494                 return 0;
1495         }
1496
1497         if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa))
1498                 return 1;
1499
1500         vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
1501         kvm_async_pf_wakeup_all(vcpu);
1502         return 0;
1503 }
1504
1505 static void kvmclock_reset(struct kvm_vcpu *vcpu)
1506 {
1507         if (vcpu->arch.time_page) {
1508                 kvm_release_page_dirty(vcpu->arch.time_page);
1509                 vcpu->arch.time_page = NULL;
1510         }
1511 }
1512
1513 static void accumulate_steal_time(struct kvm_vcpu *vcpu)
1514 {
1515         u64 delta;
1516
1517         if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
1518                 return;
1519
1520         delta = current->sched_info.run_delay - vcpu->arch.st.last_steal;
1521         vcpu->arch.st.last_steal = current->sched_info.run_delay;
1522         vcpu->arch.st.accum_steal = delta;
1523 }
1524
1525 static void record_steal_time(struct kvm_vcpu *vcpu)
1526 {
1527         if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
1528                 return;
1529
1530         if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
1531                 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time))))
1532                 return;
1533
1534         vcpu->arch.st.steal.steal += vcpu->arch.st.accum_steal;
1535         vcpu->arch.st.steal.version += 2;
1536         vcpu->arch.st.accum_steal = 0;
1537
1538         kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
1539                 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
1540 }
1541
1542 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1543 {
1544         bool pr = false;
1545
1546         switch (msr) {
1547         case MSR_EFER:
1548                 return set_efer(vcpu, data);
1549         case MSR_K7_HWCR:
1550                 data &= ~(u64)0x40;     /* ignore flush filter disable */
1551                 data &= ~(u64)0x100;    /* ignore ignne emulation enable */
1552                 data &= ~(u64)0x8;      /* ignore TLB cache disable */
1553                 if (data != 0) {
1554                         pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
1555                                 data);
1556                         return 1;
1557                 }
1558                 break;
1559         case MSR_FAM10H_MMIO_CONF_BASE:
1560                 if (data != 0) {
1561                         pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
1562                                 "0x%llx\n", data);
1563                         return 1;
1564                 }
1565                 break;
1566         case MSR_AMD64_NB_CFG:
1567                 break;
1568         case MSR_IA32_DEBUGCTLMSR:
1569                 if (!data) {
1570                         /* We support the non-activated case already */
1571                         break;
1572                 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
1573                         /* Values other than LBR and BTF are vendor-specific,
1574                            thus reserved and should throw a #GP */
1575                         return 1;
1576                 }
1577                 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
1578                         __func__, data);
1579                 break;
1580         case MSR_IA32_UCODE_REV:
1581         case MSR_IA32_UCODE_WRITE:
1582         case MSR_VM_HSAVE_PA:
1583         case MSR_AMD64_PATCH_LOADER:
1584                 break;
1585         case 0x200 ... 0x2ff:
1586                 return set_msr_mtrr(vcpu, msr, data);
1587         case MSR_IA32_APICBASE:
1588                 kvm_set_apic_base(vcpu, data);
1589                 break;
1590         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1591                 return kvm_x2apic_msr_write(vcpu, msr, data);
1592         case MSR_IA32_TSCDEADLINE:
1593                 kvm_set_lapic_tscdeadline_msr(vcpu, data);
1594                 break;
1595         case MSR_IA32_MISC_ENABLE:
1596                 vcpu->arch.ia32_misc_enable_msr = data;
1597                 break;
1598         case MSR_KVM_WALL_CLOCK_NEW:
1599         case MSR_KVM_WALL_CLOCK:
1600                 vcpu->kvm->arch.wall_clock = data;
1601                 kvm_write_wall_clock(vcpu->kvm, data);
1602                 break;
1603         case MSR_KVM_SYSTEM_TIME_NEW:
1604         case MSR_KVM_SYSTEM_TIME: {
1605                 kvmclock_reset(vcpu);
1606
1607                 vcpu->arch.time = data;
1608                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
1609
1610                 /* we verify if the enable bit is set... */
1611                 if (!(data & 1))
1612                         break;
1613
1614                 /* ...but clean it before doing the actual write */
1615                 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
1616
1617                 vcpu->arch.time_page =
1618                                 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
1619
1620                 if (is_error_page(vcpu->arch.time_page)) {
1621                         kvm_release_page_clean(vcpu->arch.time_page);
1622                         vcpu->arch.time_page = NULL;
1623                 }
1624                 break;
1625         }
1626         case MSR_KVM_ASYNC_PF_EN:
1627                 if (kvm_pv_enable_async_pf(vcpu, data))
1628                         return 1;
1629                 break;
1630         case MSR_KVM_STEAL_TIME:
1631
1632                 if (unlikely(!sched_info_on()))
1633                         return 1;
1634
1635                 if (data & KVM_STEAL_RESERVED_MASK)
1636                         return 1;
1637
1638                 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime,
1639                                                         data & KVM_STEAL_VALID_BITS))
1640                         return 1;
1641
1642                 vcpu->arch.st.msr_val = data;
1643
1644                 if (!(data & KVM_MSR_ENABLED))
1645                         break;
1646
1647                 vcpu->arch.st.last_steal = current->sched_info.run_delay;
1648
1649                 preempt_disable();
1650                 accumulate_steal_time(vcpu);
1651                 preempt_enable();
1652
1653                 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
1654
1655                 break;
1656
1657         case MSR_IA32_MCG_CTL:
1658         case MSR_IA32_MCG_STATUS:
1659         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1660                 return set_msr_mce(vcpu, msr, data);
1661
1662         /* Performance counters are not protected by a CPUID bit,
1663          * so we should check all of them in the generic path for the sake of
1664          * cross vendor migration.
1665          * Writing a zero into the event select MSRs disables them,
1666          * which we perfectly emulate ;-). Any other value should be at least
1667          * reported, some guests depend on them.
1668          */
1669         case MSR_K7_EVNTSEL0:
1670         case MSR_K7_EVNTSEL1:
1671         case MSR_K7_EVNTSEL2:
1672         case MSR_K7_EVNTSEL3:
1673                 if (data != 0)
1674                         pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1675                                 "0x%x data 0x%llx\n", msr, data);
1676                 break;
1677         /* at least RHEL 4 unconditionally writes to the perfctr registers,
1678          * so we ignore writes to make it happy.
1679          */
1680         case MSR_K7_PERFCTR0:
1681         case MSR_K7_PERFCTR1:
1682         case MSR_K7_PERFCTR2:
1683         case MSR_K7_PERFCTR3:
1684                 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1685                         "0x%x data 0x%llx\n", msr, data);
1686                 break;
1687         case MSR_P6_PERFCTR0:
1688         case MSR_P6_PERFCTR1:
1689                 pr = true;
1690         case MSR_P6_EVNTSEL0:
1691         case MSR_P6_EVNTSEL1:
1692                 if (kvm_pmu_msr(vcpu, msr))
1693                         return kvm_pmu_set_msr(vcpu, msr, data);
1694
1695                 if (pr || data != 0)
1696                         pr_unimpl(vcpu, "disabled perfctr wrmsr: "
1697                                 "0x%x data 0x%llx\n", msr, data);
1698                 break;
1699         case MSR_K7_CLK_CTL:
1700                 /*
1701                  * Ignore all writes to this no longer documented MSR.
1702                  * Writes are only relevant for old K7 processors,
1703                  * all pre-dating SVM, but a recommended workaround from
1704                  * AMD for these chips. It is possible to speicify the
1705                  * affected processor models on the command line, hence
1706                  * the need to ignore the workaround.
1707                  */
1708                 break;
1709         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1710                 if (kvm_hv_msr_partition_wide(msr)) {
1711                         int r;
1712                         mutex_lock(&vcpu->kvm->lock);
1713                         r = set_msr_hyperv_pw(vcpu, msr, data);
1714                         mutex_unlock(&vcpu->kvm->lock);
1715                         return r;
1716                 } else
1717                         return set_msr_hyperv(vcpu, msr, data);
1718                 break;
1719         case MSR_IA32_BBL_CR_CTL3:
1720                 /* Drop writes to this legacy MSR -- see rdmsr
1721                  * counterpart for further detail.
1722                  */
1723                 pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data);
1724                 break;
1725         case MSR_AMD64_OSVW_ID_LENGTH:
1726                 if (!guest_cpuid_has_osvw(vcpu))
1727                         return 1;
1728                 vcpu->arch.osvw.length = data;
1729                 break;
1730         case MSR_AMD64_OSVW_STATUS:
1731                 if (!guest_cpuid_has_osvw(vcpu))
1732                         return 1;
1733                 vcpu->arch.osvw.status = data;
1734                 break;
1735         default:
1736                 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
1737                         return xen_hvm_config(vcpu, data);
1738                 if (kvm_pmu_msr(vcpu, msr))
1739                         return kvm_pmu_set_msr(vcpu, msr, data);
1740                 if (!ignore_msrs) {
1741                         pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
1742                                 msr, data);
1743                         return 1;
1744                 } else {
1745                         pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
1746                                 msr, data);
1747                         break;
1748                 }
1749         }
1750         return 0;
1751 }
1752 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1753
1754
1755 /*
1756  * Reads an msr value (of 'msr_index') into 'pdata'.
1757  * Returns 0 on success, non-0 otherwise.
1758  * Assumes vcpu_load() was already called.
1759  */
1760 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1761 {
1762         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1763 }
1764
1765 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1766 {
1767         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1768
1769         if (!msr_mtrr_valid(msr))
1770                 return 1;
1771
1772         if (msr == MSR_MTRRdefType)
1773                 *pdata = vcpu->arch.mtrr_state.def_type +
1774                          (vcpu->arch.mtrr_state.enabled << 10);
1775         else if (msr == MSR_MTRRfix64K_00000)
1776                 *pdata = p[0];
1777         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1778                 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
1779         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1780                 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
1781         else if (msr == MSR_IA32_CR_PAT)
1782                 *pdata = vcpu->arch.pat;
1783         else {  /* Variable MTRRs */
1784                 int idx, is_mtrr_mask;
1785                 u64 *pt;
1786
1787                 idx = (msr - 0x200) / 2;
1788                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1789                 if (!is_mtrr_mask)
1790                         pt =
1791                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1792                 else
1793                         pt =
1794                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1795                 *pdata = *pt;
1796         }
1797
1798         return 0;
1799 }
1800
1801 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1802 {
1803         u64 data;
1804         u64 mcg_cap = vcpu->arch.mcg_cap;
1805         unsigned bank_num = mcg_cap & 0xff;
1806
1807         switch (msr) {
1808         case MSR_IA32_P5_MC_ADDR:
1809         case MSR_IA32_P5_MC_TYPE:
1810                 data = 0;
1811                 break;
1812         case MSR_IA32_MCG_CAP:
1813                 data = vcpu->arch.mcg_cap;
1814                 break;
1815         case MSR_IA32_MCG_CTL:
1816                 if (!(mcg_cap & MCG_CTL_P))
1817                         return 1;
1818                 data = vcpu->arch.mcg_ctl;
1819                 break;
1820         case MSR_IA32_MCG_STATUS:
1821                 data = vcpu->arch.mcg_status;
1822                 break;
1823         default:
1824                 if (msr >= MSR_IA32_MC0_CTL &&
1825                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1826                         u32 offset = msr - MSR_IA32_MC0_CTL;
1827                         data = vcpu->arch.mce_banks[offset];
1828                         break;
1829                 }
1830                 return 1;
1831         }
1832         *pdata = data;
1833         return 0;
1834 }
1835
1836 static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1837 {
1838         u64 data = 0;
1839         struct kvm *kvm = vcpu->kvm;
1840
1841         switch (msr) {
1842         case HV_X64_MSR_GUEST_OS_ID:
1843                 data = kvm->arch.hv_guest_os_id;
1844                 break;
1845         case HV_X64_MSR_HYPERCALL:
1846                 data = kvm->arch.hv_hypercall;
1847                 break;
1848         default:
1849                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1850                 return 1;
1851         }
1852
1853         *pdata = data;
1854         return 0;
1855 }
1856
1857 static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1858 {
1859         u64 data = 0;
1860
1861         switch (msr) {
1862         case HV_X64_MSR_VP_INDEX: {
1863                 int r;
1864                 struct kvm_vcpu *v;
1865                 kvm_for_each_vcpu(r, v, vcpu->kvm)
1866                         if (v == vcpu)
1867                                 data = r;
1868                 break;
1869         }
1870         case HV_X64_MSR_EOI:
1871                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1872         case HV_X64_MSR_ICR:
1873                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1874         case HV_X64_MSR_TPR:
1875                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1876         case HV_X64_MSR_APIC_ASSIST_PAGE:
1877                 data = vcpu->arch.hv_vapic;
1878                 break;
1879         default:
1880                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1881                 return 1;
1882         }
1883         *pdata = data;
1884         return 0;
1885 }
1886
1887 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1888 {
1889         u64 data;
1890
1891         switch (msr) {
1892         case MSR_IA32_PLATFORM_ID:
1893         case MSR_IA32_EBL_CR_POWERON:
1894         case MSR_IA32_DEBUGCTLMSR:
1895         case MSR_IA32_LASTBRANCHFROMIP:
1896         case MSR_IA32_LASTBRANCHTOIP:
1897         case MSR_IA32_LASTINTFROMIP:
1898         case MSR_IA32_LASTINTTOIP:
1899         case MSR_K8_SYSCFG:
1900         case MSR_K7_HWCR:
1901         case MSR_VM_HSAVE_PA:
1902         case MSR_K7_EVNTSEL0:
1903         case MSR_K7_PERFCTR0:
1904         case MSR_K8_INT_PENDING_MSG:
1905         case MSR_AMD64_NB_CFG:
1906         case MSR_FAM10H_MMIO_CONF_BASE:
1907                 data = 0;
1908                 break;
1909         case MSR_P6_PERFCTR0:
1910         case MSR_P6_PERFCTR1:
1911         case MSR_P6_EVNTSEL0:
1912         case MSR_P6_EVNTSEL1:
1913                 if (kvm_pmu_msr(vcpu, msr))
1914                         return kvm_pmu_get_msr(vcpu, msr, pdata);
1915                 data = 0;
1916                 break;
1917         case MSR_IA32_UCODE_REV:
1918                 data = 0x100000000ULL;
1919                 break;
1920         case MSR_MTRRcap:
1921                 data = 0x500 | KVM_NR_VAR_MTRR;
1922                 break;
1923         case 0x200 ... 0x2ff:
1924                 return get_msr_mtrr(vcpu, msr, pdata);
1925         case 0xcd: /* fsb frequency */
1926                 data = 3;
1927                 break;
1928                 /*
1929                  * MSR_EBC_FREQUENCY_ID
1930                  * Conservative value valid for even the basic CPU models.
1931                  * Models 0,1: 000 in bits 23:21 indicating a bus speed of
1932                  * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
1933                  * and 266MHz for model 3, or 4. Set Core Clock
1934                  * Frequency to System Bus Frequency Ratio to 1 (bits
1935                  * 31:24) even though these are only valid for CPU
1936                  * models > 2, however guests may end up dividing or
1937                  * multiplying by zero otherwise.
1938                  */
1939         case MSR_EBC_FREQUENCY_ID:
1940                 data = 1 << 24;
1941                 break;
1942         case MSR_IA32_APICBASE:
1943                 data = kvm_get_apic_base(vcpu);
1944                 break;
1945         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1946                 return kvm_x2apic_msr_read(vcpu, msr, pdata);
1947                 break;
1948         case MSR_IA32_TSCDEADLINE:
1949                 data = kvm_get_lapic_tscdeadline_msr(vcpu);
1950                 break;
1951         case MSR_IA32_MISC_ENABLE:
1952                 data = vcpu->arch.ia32_misc_enable_msr;
1953                 break;
1954         case MSR_IA32_PERF_STATUS:
1955                 /* TSC increment by tick */
1956                 data = 1000ULL;
1957                 /* CPU multiplier */
1958                 data |= (((uint64_t)4ULL) << 40);
1959                 break;
1960         case MSR_EFER:
1961                 data = vcpu->arch.efer;
1962                 break;
1963         case MSR_KVM_WALL_CLOCK:
1964         case MSR_KVM_WALL_CLOCK_NEW:
1965                 data = vcpu->kvm->arch.wall_clock;
1966                 break;
1967         case MSR_KVM_SYSTEM_TIME:
1968         case MSR_KVM_SYSTEM_TIME_NEW:
1969                 data = vcpu->arch.time;
1970                 break;
1971         case MSR_KVM_ASYNC_PF_EN:
1972                 data = vcpu->arch.apf.msr_val;
1973                 break;
1974         case MSR_KVM_STEAL_TIME:
1975                 data = vcpu->arch.st.msr_val;
1976                 break;
1977         case MSR_IA32_P5_MC_ADDR:
1978         case MSR_IA32_P5_MC_TYPE:
1979         case MSR_IA32_MCG_CAP:
1980         case MSR_IA32_MCG_CTL:
1981         case MSR_IA32_MCG_STATUS:
1982         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1983                 return get_msr_mce(vcpu, msr, pdata);
1984         case MSR_K7_CLK_CTL:
1985                 /*
1986                  * Provide expected ramp-up count for K7. All other
1987                  * are set to zero, indicating minimum divisors for
1988                  * every field.
1989                  *
1990                  * This prevents guest kernels on AMD host with CPU
1991                  * type 6, model 8 and higher from exploding due to
1992                  * the rdmsr failing.
1993                  */
1994                 data = 0x20000000;
1995                 break;
1996         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1997                 if (kvm_hv_msr_partition_wide(msr)) {
1998                         int r;
1999                         mutex_lock(&vcpu->kvm->lock);
2000                         r = get_msr_hyperv_pw(vcpu, msr, pdata);
2001                         mutex_unlock(&vcpu->kvm->lock);
2002                         return r;
2003                 } else
2004                         return get_msr_hyperv(vcpu, msr, pdata);
2005                 break;
2006         case MSR_IA32_BBL_CR_CTL3:
2007                 /* This legacy MSR exists but isn't fully documented in current
2008                  * silicon.  It is however accessed by winxp in very narrow
2009                  * scenarios where it sets bit #19, itself documented as
2010                  * a "reserved" bit.  Best effort attempt to source coherent
2011                  * read data here should the balance of the register be
2012                  * interpreted by the guest:
2013                  *
2014                  * L2 cache control register 3: 64GB range, 256KB size,
2015                  * enabled, latency 0x1, configured
2016                  */
2017                 data = 0xbe702111;
2018                 break;
2019         case MSR_AMD64_OSVW_ID_LENGTH:
2020                 if (!guest_cpuid_has_osvw(vcpu))
2021                         return 1;
2022                 data = vcpu->arch.osvw.length;
2023                 break;
2024         case MSR_AMD64_OSVW_STATUS:
2025                 if (!guest_cpuid_has_osvw(vcpu))
2026                         return 1;
2027                 data = vcpu->arch.osvw.status;
2028                 break;
2029         default:
2030                 if (kvm_pmu_msr(vcpu, msr))
2031                         return kvm_pmu_get_msr(vcpu, msr, pdata);
2032                 if (!ignore_msrs) {
2033                         pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
2034                         return 1;
2035                 } else {
2036                         pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
2037                         data = 0;
2038                 }
2039                 break;
2040         }
2041         *pdata = data;
2042         return 0;
2043 }
2044 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
2045
2046 /*
2047  * Read or write a bunch of msrs. All parameters are kernel addresses.
2048  *
2049  * @return number of msrs set successfully.
2050  */
2051 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2052                     struct kvm_msr_entry *entries,
2053                     int (*do_msr)(struct kvm_vcpu *vcpu,
2054                                   unsigned index, u64 *data))
2055 {
2056         int i, idx;
2057
2058         idx = srcu_read_lock(&vcpu->kvm->srcu);
2059         for (i = 0; i < msrs->nmsrs; ++i)
2060                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2061                         break;
2062         srcu_read_unlock(&vcpu->kvm->srcu, idx);
2063
2064         return i;
2065 }
2066
2067 /*
2068  * Read or write a bunch of msrs. Parameters are user addresses.
2069  *
2070  * @return number of msrs set successfully.
2071  */
2072 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2073                   int (*do_msr)(struct kvm_vcpu *vcpu,
2074                                 unsigned index, u64 *data),
2075                   int writeback)
2076 {
2077         struct kvm_msrs msrs;
2078         struct kvm_msr_entry *entries;
2079         int r, n;
2080         unsigned size;
2081
2082         r = -EFAULT;
2083         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2084                 goto out;
2085
2086         r = -E2BIG;
2087         if (msrs.nmsrs >= MAX_IO_MSRS)
2088                 goto out;
2089
2090         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2091         entries = memdup_user(user_msrs->entries, size);
2092         if (IS_ERR(entries)) {
2093                 r = PTR_ERR(entries);
2094                 goto out;
2095         }
2096
2097         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2098         if (r < 0)
2099                 goto out_free;
2100
2101         r = -EFAULT;
2102         if (writeback && copy_to_user(user_msrs->entries, entries, size))
2103                 goto out_free;
2104
2105         r = n;
2106
2107 out_free:
2108         kfree(entries);
2109 out:
2110         return r;
2111 }
2112
2113 int kvm_dev_ioctl_check_extension(long ext)
2114 {
2115         int r;
2116
2117         switch (ext) {
2118         case KVM_CAP_IRQCHIP:
2119         case KVM_CAP_HLT:
2120         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
2121         case KVM_CAP_SET_TSS_ADDR:
2122         case KVM_CAP_EXT_CPUID:
2123         case KVM_CAP_CLOCKSOURCE:
2124         case KVM_CAP_PIT:
2125         case KVM_CAP_NOP_IO_DELAY:
2126         case KVM_CAP_MP_STATE:
2127         case KVM_CAP_SYNC_MMU:
2128         case KVM_CAP_USER_NMI:
2129         case KVM_CAP_REINJECT_CONTROL:
2130         case KVM_CAP_IRQ_INJECT_STATUS:
2131         case KVM_CAP_ASSIGN_DEV_IRQ:
2132         case KVM_CAP_IRQFD:
2133         case KVM_CAP_IOEVENTFD:
2134         case KVM_CAP_PIT2:
2135         case KVM_CAP_PIT_STATE2:
2136         case KVM_CAP_SET_IDENTITY_MAP_ADDR:
2137         case KVM_CAP_XEN_HVM:
2138         case KVM_CAP_ADJUST_CLOCK:
2139         case KVM_CAP_VCPU_EVENTS:
2140         case KVM_CAP_HYPERV:
2141         case KVM_CAP_HYPERV_VAPIC:
2142         case KVM_CAP_HYPERV_SPIN:
2143         case KVM_CAP_PCI_SEGMENT:
2144         case KVM_CAP_DEBUGREGS:
2145         case KVM_CAP_X86_ROBUST_SINGLESTEP:
2146         case KVM_CAP_XSAVE:
2147         case KVM_CAP_ASYNC_PF:
2148         case KVM_CAP_GET_TSC_KHZ:
2149         case KVM_CAP_PCI_2_3:
2150         case KVM_CAP_KVMCLOCK_CTRL:
2151                 r = 1;
2152                 break;
2153         case KVM_CAP_COALESCED_MMIO:
2154                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
2155                 break;
2156         case KVM_CAP_VAPIC:
2157                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
2158                 break;
2159         case KVM_CAP_NR_VCPUS:
2160                 r = KVM_SOFT_MAX_VCPUS;
2161                 break;
2162         case KVM_CAP_MAX_VCPUS:
2163                 r = KVM_MAX_VCPUS;
2164                 break;
2165         case KVM_CAP_NR_MEMSLOTS:
2166                 r = KVM_MEMORY_SLOTS;
2167                 break;
2168         case KVM_CAP_PV_MMU:    /* obsolete */
2169                 r = 0;
2170                 break;
2171         case KVM_CAP_IOMMU:
2172                 r = iommu_present(&pci_bus_type);
2173                 break;
2174         case KVM_CAP_MCE:
2175                 r = KVM_MAX_MCE_BANKS;
2176                 break;
2177         case KVM_CAP_XCRS:
2178                 r = cpu_has_xsave;
2179                 break;
2180         case KVM_CAP_TSC_CONTROL:
2181                 r = kvm_has_tsc_control;
2182                 break;
2183         case KVM_CAP_TSC_DEADLINE_TIMER:
2184                 r = boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER);
2185                 break;
2186         default:
2187                 r = 0;
2188                 break;
2189         }
2190         return r;
2191
2192 }
2193
2194 long kvm_arch_dev_ioctl(struct file *filp,
2195                         unsigned int ioctl, unsigned long arg)
2196 {
2197         void __user *argp = (void __user *)arg;
2198         long r;
2199
2200         switch (ioctl) {
2201         case KVM_GET_MSR_INDEX_LIST: {
2202                 struct kvm_msr_list __user *user_msr_list = argp;
2203                 struct kvm_msr_list msr_list;
2204                 unsigned n;
2205
2206                 r = -EFAULT;
2207                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2208                         goto out;
2209                 n = msr_list.nmsrs;
2210                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2211                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2212                         goto out;
2213                 r = -E2BIG;
2214                 if (n < msr_list.nmsrs)
2215                         goto out;
2216                 r = -EFAULT;
2217                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2218                                  num_msrs_to_save * sizeof(u32)))
2219                         goto out;
2220                 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
2221                                  &emulated_msrs,
2222                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2223                         goto out;
2224                 r = 0;
2225                 break;
2226         }
2227         case KVM_GET_SUPPORTED_CPUID: {
2228                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2229                 struct kvm_cpuid2 cpuid;
2230
2231                 r = -EFAULT;
2232                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2233                         goto out;
2234                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
2235                                                       cpuid_arg->entries);
2236                 if (r)
2237                         goto out;
2238
2239                 r = -EFAULT;
2240                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2241                         goto out;
2242                 r = 0;
2243                 break;
2244         }
2245         case KVM_X86_GET_MCE_CAP_SUPPORTED: {
2246                 u64 mce_cap;
2247
2248                 mce_cap = KVM_MCE_CAP_SUPPORTED;
2249                 r = -EFAULT;
2250                 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
2251                         goto out;
2252                 r = 0;
2253                 break;
2254         }
2255         default:
2256                 r = -EINVAL;
2257         }
2258 out:
2259         return r;
2260 }
2261
2262 static void wbinvd_ipi(void *garbage)
2263 {
2264         wbinvd();
2265 }
2266
2267 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
2268 {
2269         return vcpu->kvm->arch.iommu_domain &&
2270                 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY);
2271 }
2272
2273 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2274 {
2275         /* Address WBINVD may be executed by guest */
2276         if (need_emulate_wbinvd(vcpu)) {
2277                 if (kvm_x86_ops->has_wbinvd_exit())
2278                         cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
2279                 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
2280                         smp_call_function_single(vcpu->cpu,
2281                                         wbinvd_ipi, NULL, 1);
2282         }
2283
2284         kvm_x86_ops->vcpu_load(vcpu, cpu);
2285
2286         /* Apply any externally detected TSC adjustments (due to suspend) */
2287         if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
2288                 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
2289                 vcpu->arch.tsc_offset_adjustment = 0;
2290                 set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
2291         }
2292
2293         if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
2294                 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
2295                                 native_read_tsc() - vcpu->arch.last_host_tsc;
2296                 if (tsc_delta < 0)
2297                         mark_tsc_unstable("KVM discovered backwards TSC");
2298                 if (check_tsc_unstable()) {
2299                         u64 offset = kvm_x86_ops->compute_tsc_offset(vcpu,
2300                                                 vcpu->arch.last_guest_tsc);
2301                         kvm_x86_ops->write_tsc_offset(vcpu, offset);
2302                         vcpu->arch.tsc_catchup = 1;
2303                 }
2304                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2305                 if (vcpu->cpu != cpu)
2306                         kvm_migrate_timers(vcpu);
2307                 vcpu->cpu = cpu;
2308         }
2309
2310         accumulate_steal_time(vcpu);
2311         kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
2312 }
2313
2314 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2315 {
2316         kvm_x86_ops->vcpu_put(vcpu);
2317         kvm_put_guest_fpu(vcpu);
2318         vcpu->arch.last_host_tsc = native_read_tsc();
2319 }
2320
2321 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2322                                     struct kvm_lapic_state *s)
2323 {
2324         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
2325
2326         return 0;
2327 }
2328
2329 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2330                                     struct kvm_lapic_state *s)
2331 {
2332         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
2333         kvm_apic_post_state_restore(vcpu);
2334         update_cr8_intercept(vcpu);
2335
2336         return 0;
2337 }
2338
2339 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2340                                     struct kvm_interrupt *irq)
2341 {
2342         if (irq->irq < 0 || irq->irq >= 256)
2343                 return -EINVAL;
2344         if (irqchip_in_kernel(vcpu->kvm))
2345                 return -ENXIO;
2346
2347         kvm_queue_interrupt(vcpu, irq->irq, false);
2348         kvm_make_request(KVM_REQ_EVENT, vcpu);
2349
2350         return 0;
2351 }
2352
2353 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
2354 {
2355         kvm_inject_nmi(vcpu);
2356
2357         return 0;
2358 }
2359
2360 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
2361                                            struct kvm_tpr_access_ctl *tac)
2362 {
2363         if (tac->flags)
2364                 return -EINVAL;
2365         vcpu->arch.tpr_access_reporting = !!tac->enabled;
2366         return 0;
2367 }
2368
2369 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
2370                                         u64 mcg_cap)
2371 {
2372         int r;
2373         unsigned bank_num = mcg_cap & 0xff, bank;
2374
2375         r = -EINVAL;
2376         if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
2377                 goto out;
2378         if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
2379                 goto out;
2380         r = 0;
2381         vcpu->arch.mcg_cap = mcg_cap;
2382         /* Init IA32_MCG_CTL to all 1s */
2383         if (mcg_cap & MCG_CTL_P)
2384                 vcpu->arch.mcg_ctl = ~(u64)0;
2385         /* Init IA32_MCi_CTL to all 1s */
2386         for (bank = 0; bank < bank_num; bank++)
2387                 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
2388 out:
2389         return r;
2390 }
2391
2392 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
2393                                       struct kvm_x86_mce *mce)
2394 {
2395         u64 mcg_cap = vcpu->arch.mcg_cap;
2396         unsigned bank_num = mcg_cap & 0xff;
2397         u64 *banks = vcpu->arch.mce_banks;
2398
2399         if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
2400                 return -EINVAL;
2401         /*
2402          * if IA32_MCG_CTL is not all 1s, the uncorrected error
2403          * reporting is disabled
2404          */
2405         if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
2406             vcpu->arch.mcg_ctl != ~(u64)0)
2407                 return 0;
2408         banks += 4 * mce->bank;
2409         /*
2410          * if IA32_MCi_CTL is not all 1s, the uncorrected error
2411          * reporting is disabled for the bank
2412          */
2413         if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
2414                 return 0;
2415         if (mce->status & MCI_STATUS_UC) {
2416                 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
2417                     !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
2418                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
2419                         return 0;
2420                 }
2421                 if (banks[1] & MCI_STATUS_VAL)
2422                         mce->status |= MCI_STATUS_OVER;
2423                 banks[2] = mce->addr;
2424                 banks[3] = mce->misc;
2425                 vcpu->arch.mcg_status = mce->mcg_status;
2426                 banks[1] = mce->status;
2427                 kvm_queue_exception(vcpu, MC_VECTOR);
2428         } else if (!(banks[1] & MCI_STATUS_VAL)
2429                    || !(banks[1] & MCI_STATUS_UC)) {
2430                 if (banks[1] & MCI_STATUS_VAL)
2431                         mce->status |= MCI_STATUS_OVER;
2432                 banks[2] = mce->addr;
2433                 banks[3] = mce->misc;
2434                 banks[1] = mce->status;
2435         } else
2436                 banks[1] |= MCI_STATUS_OVER;
2437         return 0;
2438 }
2439
2440 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
2441                                                struct kvm_vcpu_events *events)
2442 {
2443         process_nmi(vcpu);
2444         events->exception.injected =
2445                 vcpu->arch.exception.pending &&
2446                 !kvm_exception_is_soft(vcpu->arch.exception.nr);
2447         events->exception.nr = vcpu->arch.exception.nr;
2448         events->exception.has_error_code = vcpu->arch.exception.has_error_code;
2449         events->exception.pad = 0;
2450         events->exception.error_code = vcpu->arch.exception.error_code;
2451
2452         events->interrupt.injected =
2453                 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
2454         events->interrupt.nr = vcpu->arch.interrupt.nr;
2455         events->interrupt.soft = 0;
2456         events->interrupt.shadow =
2457                 kvm_x86_ops->get_interrupt_shadow(vcpu,
2458                         KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI);
2459
2460         events->nmi.injected = vcpu->arch.nmi_injected;
2461         events->nmi.pending = vcpu->arch.nmi_pending != 0;
2462         events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
2463         events->nmi.pad = 0;
2464
2465         events->sipi_vector = vcpu->arch.sipi_vector;
2466
2467         events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
2468                          | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2469                          | KVM_VCPUEVENT_VALID_SHADOW);
2470         memset(&events->reserved, 0, sizeof(events->reserved));
2471 }
2472
2473 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
2474                                               struct kvm_vcpu_events *events)
2475 {
2476         if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
2477                               | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2478                               | KVM_VCPUEVENT_VALID_SHADOW))
2479                 return -EINVAL;
2480
2481         process_nmi(vcpu);
2482         vcpu->arch.exception.pending = events->exception.injected;
2483         vcpu->arch.exception.nr = events->exception.nr;
2484         vcpu->arch.exception.has_error_code = events->exception.has_error_code;
2485         vcpu->arch.exception.error_code = events->exception.error_code;
2486
2487         vcpu->arch.interrupt.pending = events->interrupt.injected;
2488         vcpu->arch.interrupt.nr = events->interrupt.nr;
2489         vcpu->arch.interrupt.soft = events->interrupt.soft;
2490         if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
2491                 kvm_x86_ops->set_interrupt_shadow(vcpu,
2492                                                   events->interrupt.shadow);
2493
2494         vcpu->arch.nmi_injected = events->nmi.injected;
2495         if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
2496                 vcpu->arch.nmi_pending = events->nmi.pending;
2497         kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
2498
2499         if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR)
2500                 vcpu->arch.sipi_vector = events->sipi_vector;
2501
2502         kvm_make_request(KVM_REQ_EVENT, vcpu);
2503
2504         return 0;
2505 }
2506
2507 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
2508                                              struct kvm_debugregs *dbgregs)
2509 {
2510         memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
2511         dbgregs->dr6 = vcpu->arch.dr6;
2512         dbgregs->dr7 = vcpu->arch.dr7;
2513         dbgregs->flags = 0;
2514         memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
2515 }
2516
2517 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
2518                                             struct kvm_debugregs *dbgregs)
2519 {
2520         if (dbgregs->flags)
2521                 return -EINVAL;
2522
2523         memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
2524         vcpu->arch.dr6 = dbgregs->dr6;
2525         vcpu->arch.dr7 = dbgregs->dr7;
2526
2527         return 0;
2528 }
2529
2530 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
2531                                          struct kvm_xsave *guest_xsave)
2532 {
2533         if (cpu_has_xsave)
2534                 memcpy(guest_xsave->region,
2535                         &vcpu->arch.guest_fpu.state->xsave,
2536                         xstate_size);
2537         else {
2538                 memcpy(guest_xsave->region,
2539                         &vcpu->arch.guest_fpu.state->fxsave,
2540                         sizeof(struct i387_fxsave_struct));
2541                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
2542                         XSTATE_FPSSE;
2543         }
2544 }
2545
2546 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
2547                                         struct kvm_xsave *guest_xsave)
2548 {
2549         u64 xstate_bv =
2550                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
2551
2552         if (cpu_has_xsave)
2553                 memcpy(&vcpu->arch.guest_fpu.state->xsave,
2554                         guest_xsave->region, xstate_size);
2555         else {
2556                 if (xstate_bv & ~XSTATE_FPSSE)
2557                         return -EINVAL;
2558                 memcpy(&vcpu->arch.guest_fpu.state->fxsave,
2559                         guest_xsave->region, sizeof(struct i387_fxsave_struct));
2560         }
2561         return 0;
2562 }
2563
2564 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
2565                                         struct kvm_xcrs *guest_xcrs)
2566 {
2567         if (!cpu_has_xsave) {
2568                 guest_xcrs->nr_xcrs = 0;
2569                 return;
2570         }
2571
2572         guest_xcrs->nr_xcrs = 1;
2573         guest_xcrs->flags = 0;
2574         guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
2575         guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
2576 }
2577
2578 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
2579                                        struct kvm_xcrs *guest_xcrs)
2580 {
2581         int i, r = 0;
2582
2583         if (!cpu_has_xsave)
2584                 return -EINVAL;
2585
2586         if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
2587                 return -EINVAL;
2588
2589         for (i = 0; i < guest_xcrs->nr_xcrs; i++)
2590                 /* Only support XCR0 currently */
2591                 if (guest_xcrs->xcrs[0].xcr == XCR_XFEATURE_ENABLED_MASK) {
2592                         r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
2593                                 guest_xcrs->xcrs[0].value);
2594                         break;
2595                 }
2596         if (r)
2597                 r = -EINVAL;
2598         return r;
2599 }
2600
2601 /*
2602  * kvm_set_guest_paused() indicates to the guest kernel that it has been
2603  * stopped by the hypervisor.  This function will be called from the host only.
2604  * EINVAL is returned when the host attempts to set the flag for a guest that
2605  * does not support pv clocks.
2606  */
2607 static int kvm_set_guest_paused(struct kvm_vcpu *vcpu)
2608 {
2609         struct pvclock_vcpu_time_info *src = &vcpu->arch.hv_clock;
2610         if (!vcpu->arch.time_page)
2611                 return -EINVAL;
2612         src->flags |= PVCLOCK_GUEST_STOPPED;
2613         mark_page_dirty(vcpu->kvm, vcpu->arch.time >> PAGE_SHIFT);
2614         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2615         return 0;
2616 }
2617
2618 long kvm_arch_vcpu_ioctl(struct file *filp,
2619                          unsigned int ioctl, unsigned long arg)
2620 {
2621         struct kvm_vcpu *vcpu = filp->private_data;
2622         void __user *argp = (void __user *)arg;
2623         int r;
2624         union {
2625                 struct kvm_lapic_state *lapic;
2626                 struct kvm_xsave *xsave;
2627                 struct kvm_xcrs *xcrs;
2628                 void *buffer;
2629         } u;
2630
2631         u.buffer = NULL;
2632         switch (ioctl) {
2633         case KVM_GET_LAPIC: {
2634                 r = -EINVAL;
2635                 if (!vcpu->arch.apic)
2636                         goto out;
2637                 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2638
2639                 r = -ENOMEM;
2640                 if (!u.lapic)
2641                         goto out;
2642                 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
2643                 if (r)
2644                         goto out;
2645                 r = -EFAULT;
2646                 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
2647                         goto out;
2648                 r = 0;
2649                 break;
2650         }
2651         case KVM_SET_LAPIC: {
2652                 r = -EINVAL;
2653                 if (!vcpu->arch.apic)
2654                         goto out;
2655                 u.lapic = memdup_user(argp, sizeof(*u.lapic));
2656                 if (IS_ERR(u.lapic)) {
2657                         r = PTR_ERR(u.lapic);
2658                         goto out;
2659                 }
2660
2661                 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
2662                 if (r)
2663                         goto out;
2664                 r = 0;
2665                 break;
2666         }
2667         case KVM_INTERRUPT: {
2668                 struct kvm_interrupt irq;
2669
2670                 r = -EFAULT;
2671                 if (copy_from_user(&irq, argp, sizeof irq))
2672                         goto out;
2673                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2674                 if (r)
2675                         goto out;
2676                 r = 0;
2677                 break;
2678         }
2679         case KVM_NMI: {
2680                 r = kvm_vcpu_ioctl_nmi(vcpu);
2681                 if (r)
2682                         goto out;
2683                 r = 0;
2684                 break;
2685         }
2686         case KVM_SET_CPUID: {
2687                 struct kvm_cpuid __user *cpuid_arg = argp;
2688                 struct kvm_cpuid cpuid;
2689
2690                 r = -EFAULT;
2691                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2692                         goto out;
2693                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2694                 if (r)
2695                         goto out;
2696                 break;
2697         }
2698         case KVM_SET_CPUID2: {
2699                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2700                 struct kvm_cpuid2 cpuid;
2701
2702                 r = -EFAULT;
2703                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2704                         goto out;
2705                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
2706                                               cpuid_arg->entries);
2707                 if (r)
2708                         goto out;
2709                 break;
2710         }
2711         case KVM_GET_CPUID2: {
2712                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2713                 struct kvm_cpuid2 cpuid;
2714
2715                 r = -EFAULT;
2716                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2717                         goto out;
2718                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
2719                                               cpuid_arg->entries);
2720                 if (r)
2721                         goto out;
2722                 r = -EFAULT;
2723                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2724                         goto out;
2725                 r = 0;
2726                 break;
2727         }
2728         case KVM_GET_MSRS:
2729                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2730                 break;
2731         case KVM_SET_MSRS:
2732                 r = msr_io(vcpu, argp, do_set_msr, 0);
2733                 break;
2734         case KVM_TPR_ACCESS_REPORTING: {
2735                 struct kvm_tpr_access_ctl tac;
2736
2737                 r = -EFAULT;
2738                 if (copy_from_user(&tac, argp, sizeof tac))
2739                         goto out;
2740                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
2741                 if (r)
2742                         goto out;
2743                 r = -EFAULT;
2744                 if (copy_to_user(argp, &tac, sizeof tac))
2745                         goto out;
2746                 r = 0;
2747                 break;
2748         };
2749         case KVM_SET_VAPIC_ADDR: {
2750                 struct kvm_vapic_addr va;
2751
2752                 r = -EINVAL;
2753                 if (!irqchip_in_kernel(vcpu->kvm))
2754                         goto out;
2755                 r = -EFAULT;
2756                 if (copy_from_user(&va, argp, sizeof va))
2757                         goto out;
2758                 r = 0;
2759                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
2760                 break;
2761         }
2762         case KVM_X86_SETUP_MCE: {
2763                 u64 mcg_cap;
2764
2765                 r = -EFAULT;
2766                 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
2767                         goto out;
2768                 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
2769                 break;
2770         }
2771         case KVM_X86_SET_MCE: {
2772                 struct kvm_x86_mce mce;
2773
2774                 r = -EFAULT;
2775                 if (copy_from_user(&mce, argp, sizeof mce))
2776                         goto out;
2777                 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
2778                 break;
2779         }
2780         case KVM_GET_VCPU_EVENTS: {
2781                 struct kvm_vcpu_events events;
2782
2783                 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
2784
2785                 r = -EFAULT;
2786                 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
2787                         break;
2788                 r = 0;
2789                 break;
2790         }
2791         case KVM_SET_VCPU_EVENTS: {
2792                 struct kvm_vcpu_events events;
2793
2794                 r = -EFAULT;
2795                 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
2796                         break;
2797
2798                 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
2799                 break;
2800         }
2801         case KVM_GET_DEBUGREGS: {
2802                 struct kvm_debugregs dbgregs;
2803
2804                 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
2805
2806                 r = -EFAULT;
2807                 if (copy_to_user(argp, &dbgregs,
2808                                  sizeof(struct kvm_debugregs)))
2809                         break;
2810                 r = 0;
2811                 break;
2812         }
2813         case KVM_SET_DEBUGREGS: {
2814                 struct kvm_debugregs dbgregs;
2815
2816                 r = -EFAULT;
2817                 if (copy_from_user(&dbgregs, argp,
2818                                    sizeof(struct kvm_debugregs)))
2819                         break;
2820
2821                 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
2822                 break;
2823         }
2824         case KVM_GET_XSAVE: {
2825                 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
2826                 r = -ENOMEM;
2827                 if (!u.xsave)
2828                         break;
2829
2830                 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
2831
2832                 r = -EFAULT;
2833                 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
2834                         break;
2835                 r = 0;
2836                 break;
2837         }
2838         case KVM_SET_XSAVE: {
2839                 u.xsave = memdup_user(argp, sizeof(*u.xsave));
2840                 if (IS_ERR(u.xsave)) {
2841                         r = PTR_ERR(u.xsave);
2842                         goto out;
2843                 }
2844
2845                 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
2846                 break;
2847         }
2848         case KVM_GET_XCRS: {
2849                 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
2850                 r = -ENOMEM;
2851                 if (!u.xcrs)
2852                         break;
2853
2854                 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
2855
2856                 r = -EFAULT;
2857                 if (copy_to_user(argp, u.xcrs,
2858                                  sizeof(struct kvm_xcrs)))
2859                         break;
2860                 r = 0;
2861                 break;
2862         }
2863         case KVM_SET_XCRS: {
2864                 u.xcrs = memdup_user(argp, sizeof(*u.xcrs));
2865                 if (IS_ERR(u.xcrs)) {
2866                         r = PTR_ERR(u.xcrs);
2867                         goto out;
2868                 }
2869
2870                 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
2871                 break;
2872         }
2873         case KVM_SET_TSC_KHZ: {
2874                 u32 user_tsc_khz;
2875
2876                 r = -EINVAL;
2877                 user_tsc_khz = (u32)arg;
2878
2879                 if (user_tsc_khz >= kvm_max_guest_tsc_khz)
2880                         goto out;
2881
2882                 if (user_tsc_khz == 0)
2883                         user_tsc_khz = tsc_khz;
2884
2885                 kvm_set_tsc_khz(vcpu, user_tsc_khz);
2886
2887                 r = 0;
2888                 goto out;
2889         }
2890         case KVM_GET_TSC_KHZ: {
2891                 r = vcpu->arch.virtual_tsc_khz;
2892                 goto out;
2893         }
2894         case KVM_KVMCLOCK_CTRL: {
2895                 r = kvm_set_guest_paused(vcpu);
2896                 goto out;
2897         }
2898         default:
2899                 r = -EINVAL;
2900         }
2901 out:
2902         kfree(u.buffer);
2903         return r;
2904 }
2905
2906 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
2907 {
2908         return VM_FAULT_SIGBUS;
2909 }
2910
2911 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
2912 {
2913         int ret;
2914
2915         if (addr > (unsigned int)(-3 * PAGE_SIZE))
2916                 return -1;
2917         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
2918         return ret;
2919 }
2920
2921 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
2922                                               u64 ident_addr)
2923 {
2924         kvm->arch.ept_identity_map_addr = ident_addr;
2925         return 0;
2926 }
2927
2928 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
2929                                           u32 kvm_nr_mmu_pages)
2930 {
2931         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
2932                 return -EINVAL;
2933
2934         mutex_lock(&kvm->slots_lock);
2935         spin_lock(&kvm->mmu_lock);
2936
2937         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
2938         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
2939
2940         spin_unlock(&kvm->mmu_lock);
2941         mutex_unlock(&kvm->slots_lock);
2942         return 0;
2943 }
2944
2945 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
2946 {
2947         return kvm->arch.n_max_mmu_pages;
2948 }
2949
2950 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2951 {
2952         int r;
2953
2954         r = 0;
2955         switch (chip->chip_id) {
2956         case KVM_IRQCHIP_PIC_MASTER:
2957                 memcpy(&chip->chip.pic,
2958                         &pic_irqchip(kvm)->pics[0],
2959                         sizeof(struct kvm_pic_state));
2960                 break;
2961         case KVM_IRQCHIP_PIC_SLAVE:
2962                 memcpy(&chip->chip.pic,
2963                         &pic_irqchip(kvm)->pics[1],
2964                         sizeof(struct kvm_pic_state));
2965                 break;
2966         case KVM_IRQCHIP_IOAPIC:
2967                 r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
2968                 break;
2969         default:
2970                 r = -EINVAL;
2971                 break;
2972         }
2973         return r;
2974 }
2975
2976 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2977 {
2978         int r;
2979
2980         r = 0;
2981         switch (chip->chip_id) {
2982         case KVM_IRQCHIP_PIC_MASTER:
2983                 spin_lock(&pic_irqchip(kvm)->lock);
2984                 memcpy(&pic_irqchip(kvm)->pics[0],
2985                         &chip->chip.pic,
2986                         sizeof(struct kvm_pic_state));
2987                 spin_unlock(&pic_irqchip(kvm)->lock);
2988                 break;
2989         case KVM_IRQCHIP_PIC_SLAVE:
2990                 spin_lock(&pic_irqchip(kvm)->lock);
2991                 memcpy(&pic_irqchip(kvm)->pics[1],
2992                         &chip->chip.pic,
2993                         sizeof(struct kvm_pic_state));
2994                 spin_unlock(&pic_irqchip(kvm)->lock);
2995                 break;
2996         case KVM_IRQCHIP_IOAPIC:
2997                 r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
2998                 break;
2999         default:
3000                 r = -EINVAL;
3001                 break;
3002         }
3003         kvm_pic_update_irq(pic_irqchip(kvm));
3004         return r;
3005 }
3006
3007 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3008 {
3009         int r = 0;
3010
3011         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3012         memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
3013         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3014         return r;
3015 }
3016
3017 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3018 {
3019         int r = 0;
3020
3021         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3022         memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
3023         kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
3024         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3025         return r;
3026 }
3027
3028 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3029 {
3030         int r = 0;
3031
3032         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3033         memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
3034                 sizeof(ps->channels));
3035         ps->flags = kvm->arch.vpit->pit_state.flags;
3036         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3037         memset(&ps->reserved, 0, sizeof(ps->reserved));
3038         return r;
3039 }
3040
3041 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3042 {
3043         int r = 0, start = 0;
3044         u32 prev_legacy, cur_legacy;
3045         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3046         prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
3047         cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
3048         if (!prev_legacy && cur_legacy)
3049                 start = 1;
3050         memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
3051                sizeof(kvm->arch.vpit->pit_state.channels));
3052         kvm->arch.vpit->pit_state.flags = ps->flags;
3053         kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
3054         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3055         return r;
3056 }
3057
3058 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
3059                                  struct kvm_reinject_control *control)
3060 {
3061         if (!kvm->arch.vpit)
3062                 return -ENXIO;
3063         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3064         kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject;
3065         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3066         return 0;
3067 }
3068
3069 /**
3070  * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
3071  * @kvm: kvm instance
3072  * @log: slot id and address to which we copy the log
3073  *
3074  * We need to keep it in mind that VCPU threads can write to the bitmap
3075  * concurrently.  So, to avoid losing data, we keep the following order for
3076  * each bit:
3077  *
3078  *   1. Take a snapshot of the bit and clear it if needed.
3079  *   2. Write protect the corresponding page.
3080  *   3. Flush TLB's if needed.
3081  *   4. Copy the snapshot to the userspace.
3082  *
3083  * Between 2 and 3, the guest may write to the page using the remaining TLB
3084  * entry.  This is not a problem because the page will be reported dirty at
3085  * step 4 using the snapshot taken before and step 3 ensures that successive
3086  * writes will be logged for the next call.
3087  */
3088 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
3089 {
3090         int r;
3091         struct kvm_memory_slot *memslot;
3092         unsigned long n, i;
3093         unsigned long *dirty_bitmap;
3094         unsigned long *dirty_bitmap_buffer;
3095         bool is_dirty = false;
3096
3097         mutex_lock(&kvm->slots_lock);
3098
3099         r = -EINVAL;
3100         if (log->slot >= KVM_MEMORY_SLOTS)
3101                 goto out;
3102
3103         memslot = id_to_memslot(kvm->memslots, log->slot);
3104
3105         dirty_bitmap = memslot->dirty_bitmap;
3106         r = -ENOENT;
3107         if (!dirty_bitmap)
3108                 goto out;
3109
3110         n = kvm_dirty_bitmap_bytes(memslot);
3111
3112         dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
3113         memset(dirty_bitmap_buffer, 0, n);
3114
3115         spin_lock(&kvm->mmu_lock);
3116
3117         for (i = 0; i < n / sizeof(long); i++) {
3118                 unsigned long mask;
3119                 gfn_t offset;
3120
3121                 if (!dirty_bitmap[i])
3122                         continue;
3123
3124                 is_dirty = true;
3125
3126                 mask = xchg(&dirty_bitmap[i], 0);
3127                 dirty_bitmap_buffer[i] = mask;
3128
3129                 offset = i * BITS_PER_LONG;
3130                 kvm_mmu_write_protect_pt_masked(kvm, memslot, offset, mask);
3131         }
3132         if (is_dirty)
3133                 kvm_flush_remote_tlbs(kvm);
3134
3135         spin_unlock(&kvm->mmu_lock);
3136
3137         r = -EFAULT;
3138         if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
3139                 goto out;
3140
3141         r = 0;
3142 out:
3143         mutex_unlock(&kvm->slots_lock);
3144         return r;
3145 }
3146
3147 long kvm_arch_vm_ioctl(struct file *filp,
3148                        unsigned int ioctl, unsigned long arg)
3149 {
3150         struct kvm *kvm = filp->private_data;
3151         void __user *argp = (void __user *)arg;
3152         int r = -ENOTTY;
3153         /*
3154          * This union makes it completely explicit to gcc-3.x
3155          * that these two variables' stack usage should be
3156          * combined, not added together.
3157          */
3158         union {
3159                 struct kvm_pit_state ps;
3160                 struct kvm_pit_state2 ps2;
3161                 struct kvm_pit_config pit_config;
3162         } u;
3163
3164         switch (ioctl) {
3165         case KVM_SET_TSS_ADDR:
3166                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
3167                 if (r < 0)
3168                         goto out;
3169                 break;
3170         case KVM_SET_IDENTITY_MAP_ADDR: {
3171                 u64 ident_addr;
3172
3173                 r = -EFAULT;
3174                 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
3175                         goto out;
3176                 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
3177                 if (r < 0)
3178                         goto out;
3179                 break;
3180         }
3181         case KVM_SET_NR_MMU_PAGES:
3182                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
3183                 if (r)
3184                         goto out;
3185                 break;
3186         case KVM_GET_NR_MMU_PAGES:
3187                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
3188                 break;
3189         case KVM_CREATE_IRQCHIP: {
3190                 struct kvm_pic *vpic;
3191
3192                 mutex_lock(&kvm->lock);
3193                 r = -EEXIST;
3194                 if (kvm->arch.vpic)
3195                         goto create_irqchip_unlock;
3196                 r = -EINVAL;
3197                 if (atomic_read(&kvm->online_vcpus))
3198                         goto create_irqchip_unlock;
3199                 r = -ENOMEM;
3200                 vpic = kvm_create_pic(kvm);
3201                 if (vpic) {
3202                         r = kvm_ioapic_init(kvm);
3203                         if (r) {
3204                                 mutex_lock(&kvm->slots_lock);
3205                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3206                                                           &vpic->dev_master);
3207                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3208                                                           &vpic->dev_slave);
3209                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3210                                                           &vpic->dev_eclr);
3211                                 mutex_unlock(&kvm->slots_lock);
3212                                 kfree(vpic);
3213                                 goto create_irqchip_unlock;
3214                         }
3215                 } else
3216                         goto create_irqchip_unlock;
3217                 smp_wmb();
3218                 kvm->arch.vpic = vpic;
3219                 smp_wmb();
3220                 r = kvm_setup_default_irq_routing(kvm);
3221                 if (r) {
3222                         mutex_lock(&kvm->slots_lock);
3223                         mutex_lock(&kvm->irq_lock);
3224                         kvm_ioapic_destroy(kvm);
3225                         kvm_destroy_pic(kvm);
3226                         mutex_unlock(&kvm->irq_lock);
3227                         mutex_unlock(&kvm->slots_lock);
3228                 }
3229         create_irqchip_unlock:
3230                 mutex_unlock(&kvm->lock);
3231                 break;
3232         }
3233         case KVM_CREATE_PIT:
3234                 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
3235                 goto create_pit;
3236         case KVM_CREATE_PIT2:
3237                 r = -EFAULT;
3238                 if (copy_from_user(&u.pit_config, argp,
3239                                    sizeof(struct kvm_pit_config)))
3240                         goto out;
3241         create_pit:
3242                 mutex_lock(&kvm->slots_lock);
3243                 r = -EEXIST;
3244                 if (kvm->arch.vpit)
3245                         goto create_pit_unlock;
3246                 r = -ENOMEM;
3247                 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
3248                 if (kvm->arch.vpit)
3249                         r = 0;
3250         create_pit_unlock:
3251                 mutex_unlock(&kvm->slots_lock);
3252                 break;
3253         case KVM_IRQ_LINE_STATUS:
3254         case KVM_IRQ_LINE: {
3255                 struct kvm_irq_level irq_event;
3256
3257                 r = -EFAULT;
3258                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
3259                         goto out;
3260                 r = -ENXIO;
3261                 if (irqchip_in_kernel(kvm)) {
3262                         __s32 status;
3263                         status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
3264                                         irq_event.irq, irq_event.level);
3265                         if (ioctl == KVM_IRQ_LINE_STATUS) {
3266                                 r = -EFAULT;
3267                                 irq_event.status = status;
3268                                 if (copy_to_user(argp, &irq_event,
3269                                                         sizeof irq_event))
3270                                         goto out;
3271                         }
3272                         r = 0;
3273                 }
3274                 break;
3275         }
3276         case KVM_GET_IRQCHIP: {
3277                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3278                 struct kvm_irqchip *chip;
3279
3280                 chip = memdup_user(argp, sizeof(*chip));
3281                 if (IS_ERR(chip)) {
3282                         r = PTR_ERR(chip);
3283                         goto out;
3284                 }
3285
3286                 r = -ENXIO;
3287                 if (!irqchip_in_kernel(kvm))
3288                         goto get_irqchip_out;
3289                 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
3290                 if (r)
3291                         goto get_irqchip_out;
3292                 r = -EFAULT;
3293                 if (copy_to_user(argp, chip, sizeof *chip))
3294                         goto get_irqchip_out;
3295                 r = 0;
3296         get_irqchip_out:
3297                 kfree(chip);
3298                 if (r)
3299                         goto out;
3300                 break;
3301         }
3302         case KVM_SET_IRQCHIP: {
3303                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3304                 struct kvm_irqchip *chip;
3305
3306                 chip = memdup_user(argp, sizeof(*chip));
3307                 if (IS_ERR(chip)) {
3308                         r = PTR_ERR(chip);
3309                         goto out;
3310                 }
3311
3312                 r = -ENXIO;
3313                 if (!irqchip_in_kernel(kvm))
3314                         goto set_irqchip_out;
3315                 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
3316                 if (r)
3317                         goto set_irqchip_out;
3318                 r = 0;
3319         set_irqchip_out:
3320                 kfree(chip);
3321                 if (r)
3322                         goto out;
3323                 break;
3324         }
3325         case KVM_GET_PIT: {
3326                 r = -EFAULT;
3327                 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
3328                         goto out;
3329                 r = -ENXIO;
3330                 if (!kvm->arch.vpit)
3331                         goto out;
3332                 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
3333                 if (r)
3334                         goto out;
3335                 r = -EFAULT;
3336                 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
3337                         goto out;
3338                 r = 0;
3339                 break;
3340         }
3341         case KVM_SET_PIT: {
3342                 r = -EFAULT;
3343                 if (copy_from_user(&u.ps, argp, sizeof u.ps))
3344                         goto out;
3345                 r = -ENXIO;
3346                 if (!kvm->arch.vpit)
3347                         goto out;
3348                 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
3349                 if (r)
3350                         goto out;
3351                 r = 0;
3352                 break;
3353         }
3354         case KVM_GET_PIT2: {
3355                 r = -ENXIO;
3356                 if (!kvm->arch.vpit)
3357                         goto out;
3358                 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
3359                 if (r)
3360                         goto out;
3361                 r = -EFAULT;
3362                 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
3363                         goto out;
3364                 r = 0;
3365                 break;
3366         }
3367         case KVM_SET_PIT2: {
3368                 r = -EFAULT;
3369                 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
3370                         goto out;
3371                 r = -ENXIO;
3372                 if (!kvm->arch.vpit)
3373                         goto out;
3374                 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
3375                 if (r)
3376                         goto out;
3377                 r = 0;
3378                 break;
3379         }
3380         case KVM_REINJECT_CONTROL: {
3381                 struct kvm_reinject_control control;
3382                 r =  -EFAULT;
3383                 if (copy_from_user(&control, argp, sizeof(control)))
3384                         goto out;
3385                 r = kvm_vm_ioctl_reinject(kvm, &control);
3386                 if (r)
3387                         goto out;
3388                 r = 0;
3389                 break;
3390         }
3391         case KVM_XEN_HVM_CONFIG: {
3392                 r = -EFAULT;
3393                 if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
3394                                    sizeof(struct kvm_xen_hvm_config)))
3395                         goto out;
3396                 r = -EINVAL;
3397                 if (kvm->arch.xen_hvm_config.flags)
3398                         goto out;
3399                 r = 0;
3400                 break;
3401         }
3402         case KVM_SET_CLOCK: {
3403                 struct kvm_clock_data user_ns;
3404                 u64 now_ns;
3405                 s64 delta;
3406
3407                 r = -EFAULT;
3408                 if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
3409                         goto out;
3410
3411                 r = -EINVAL;
3412                 if (user_ns.flags)
3413                         goto out;
3414
3415                 r = 0;
3416                 local_irq_disable();
3417                 now_ns = get_kernel_ns();
3418                 delta = user_ns.clock - now_ns;
3419                 local_irq_enable();
3420                 kvm->arch.kvmclock_offset = delta;
3421                 break;
3422         }
3423         case KVM_GET_CLOCK: {
3424                 struct kvm_clock_data user_ns;
3425                 u64 now_ns;
3426
3427                 local_irq_disable();
3428                 now_ns = get_kernel_ns();
3429                 user_ns.clock = kvm->arch.kvmclock_offset + now_ns;
3430                 local_irq_enable();
3431                 user_ns.flags = 0;
3432                 memset(&user_ns.pad, 0, sizeof(user_ns.pad));
3433
3434                 r = -EFAULT;
3435                 if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
3436                         goto out;
3437                 r = 0;
3438                 break;
3439         }
3440
3441         default:
3442                 ;
3443         }
3444 out:
3445         return r;
3446 }
3447
3448 static void kvm_init_msr_list(void)
3449 {
3450         u32 dummy[2];
3451         unsigned i, j;
3452
3453         /* skip the first msrs in the list. KVM-specific */
3454         for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) {
3455                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
3456                         continue;
3457                 if (j < i)
3458                         msrs_to_save[j] = msrs_to_save[i];
3459                 j++;
3460         }
3461         num_msrs_to_save = j;
3462 }
3463
3464 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
3465                            const void *v)
3466 {
3467         int handled = 0;
3468         int n;
3469
3470         do {
3471                 n = min(len, 8);
3472                 if (!(vcpu->arch.apic &&
3473                       !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, n, v))
3474                     && kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
3475                         break;
3476                 handled += n;
3477                 addr += n;
3478                 len -= n;
3479                 v += n;
3480         } while (len);
3481
3482         return handled;
3483 }
3484
3485 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
3486 {
3487         int handled = 0;
3488         int n;
3489
3490         do {
3491                 n = min(len, 8);
3492                 if (!(vcpu->arch.apic &&
3493                       !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, n, v))
3494                     && kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
3495                         break;
3496                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v);
3497                 handled += n;
3498                 addr += n;
3499                 len -= n;
3500                 v += n;
3501         } while (len);
3502
3503         return handled;
3504 }
3505
3506 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3507                         struct kvm_segment *var, int seg)
3508 {
3509         kvm_x86_ops->set_segment(vcpu, var, seg);
3510 }
3511
3512 void kvm_get_segment(struct kvm_vcpu *vcpu,
3513                      struct kvm_segment *var, int seg)
3514 {
3515         kvm_x86_ops->get_segment(vcpu, var, seg);
3516 }
3517
3518 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
3519 {
3520         gpa_t t_gpa;
3521         struct x86_exception exception;
3522
3523         BUG_ON(!mmu_is_nested(vcpu));
3524
3525         /* NPT walks are always user-walks */
3526         access |= PFERR_USER_MASK;
3527         t_gpa  = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, &exception);
3528
3529         return t_gpa;
3530 }
3531
3532 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
3533                               struct x86_exception *exception)
3534 {
3535         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3536         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3537 }
3538
3539  gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
3540                                 struct x86_exception *exception)
3541 {
3542         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3543         access |= PFERR_FETCH_MASK;
3544         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3545 }
3546
3547 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
3548                                struct x86_exception *exception)
3549 {
3550         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3551         access |= PFERR_WRITE_MASK;
3552         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3553 }
3554
3555 /* uses this to access any guest's mapped memory without checking CPL */
3556 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
3557                                 struct x86_exception *exception)
3558 {
3559         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception);
3560 }
3561
3562 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
3563                                       struct kvm_vcpu *vcpu, u32 access,
3564                                       struct x86_exception *exception)
3565 {
3566         void *data = val;
3567         int r = X86EMUL_CONTINUE;
3568
3569         while (bytes) {
3570                 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
3571                                                             exception);
3572                 unsigned offset = addr & (PAGE_SIZE-1);
3573                 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
3574                 int ret;
3575
3576                 if (gpa == UNMAPPED_GVA)
3577                         return X86EMUL_PROPAGATE_FAULT;
3578                 ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
3579                 if (ret < 0) {
3580                         r = X86EMUL_IO_NEEDED;
3581                         goto out;
3582                 }
3583
3584                 bytes -= toread;
3585                 data += toread;
3586                 addr += toread;
3587         }
3588 out:
3589         return r;
3590 }
3591
3592 /* used for instruction fetching */
3593 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
3594                                 gva_t addr, void *val, unsigned int bytes,
3595                                 struct x86_exception *exception)
3596 {
3597         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3598         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3599
3600         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu,
3601                                           access | PFERR_FETCH_MASK,
3602                                           exception);
3603 }
3604
3605 int kvm_read_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, access,
3613                                           exception);
3614 }
3615 EXPORT_SYMBOL_GPL(kvm_read_guest_virt);
3616
3617 static int kvm_read_guest_virt_system(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         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
3623 }
3624
3625 int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
3626                                        gva_t addr, void *val,
3627                                        unsigned int bytes,
3628                                        struct x86_exception *exception)
3629 {
3630         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3631         void *data = val;
3632         int r = X86EMUL_CONTINUE;
3633
3634         while (bytes) {
3635                 gpa_t gpa =  vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
3636                                                              PFERR_WRITE_MASK,
3637                                                              exception);
3638                 unsigned offset = addr & (PAGE_SIZE-1);
3639                 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
3640                 int ret;
3641
3642                 if (gpa == UNMAPPED_GVA)
3643                         return X86EMUL_PROPAGATE_FAULT;
3644                 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
3645                 if (ret < 0) {
3646                         r = X86EMUL_IO_NEEDED;
3647                         goto out;
3648                 }
3649
3650                 bytes -= towrite;
3651                 data += towrite;
3652                 addr += towrite;
3653         }
3654 out:
3655         return r;
3656 }
3657 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
3658
3659 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
3660                                 gpa_t *gpa, struct x86_exception *exception,
3661                                 bool write)
3662 {
3663         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3664
3665         if (vcpu_match_mmio_gva(vcpu, gva) &&
3666                   check_write_user_access(vcpu, write, access,
3667                   vcpu->arch.access)) {
3668                 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
3669                                         (gva & (PAGE_SIZE - 1));
3670                 trace_vcpu_match_mmio(gva, *gpa, write, false);
3671                 return 1;
3672         }
3673
3674         if (write)
3675                 access |= PFERR_WRITE_MASK;
3676
3677         *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3678
3679         if (*gpa == UNMAPPED_GVA)
3680                 return -1;
3681
3682         /* For APIC access vmexit */
3683         if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3684                 return 1;
3685
3686         if (vcpu_match_mmio_gpa(vcpu, *gpa)) {
3687                 trace_vcpu_match_mmio(gva, *gpa, write, true);
3688                 return 1;
3689         }
3690
3691         return 0;
3692 }
3693
3694 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
3695                         const void *val, int bytes)
3696 {
3697         int ret;
3698
3699         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
3700         if (ret < 0)
3701                 return 0;
3702         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
3703         return 1;
3704 }
3705
3706 struct read_write_emulator_ops {
3707         int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val,
3708                                   int bytes);
3709         int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa,
3710                                   void *val, int bytes);
3711         int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
3712                                int bytes, void *val);
3713         int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
3714                                     void *val, int bytes);
3715         bool write;
3716 };
3717
3718 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
3719 {
3720         if (vcpu->mmio_read_completed) {
3721                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
3722                                vcpu->mmio_fragments[0].gpa, *(u64 *)val);
3723                 vcpu->mmio_read_completed = 0;
3724                 return 1;
3725         }
3726
3727         return 0;
3728 }
3729
3730 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
3731                         void *val, int bytes)
3732 {
3733         return !kvm_read_guest(vcpu->kvm, gpa, val, bytes);
3734 }
3735
3736 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
3737                          void *val, int bytes)
3738 {
3739         return emulator_write_phys(vcpu, gpa, val, bytes);
3740 }
3741
3742 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
3743 {
3744         trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
3745         return vcpu_mmio_write(vcpu, gpa, bytes, val);
3746 }
3747
3748 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
3749                           void *val, int bytes)
3750 {
3751         trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
3752         return X86EMUL_IO_NEEDED;
3753 }
3754
3755 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
3756                            void *val, int bytes)
3757 {
3758         struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0];
3759
3760         memcpy(vcpu->run->mmio.data, frag->data, frag->len);
3761         return X86EMUL_CONTINUE;
3762 }
3763
3764 static struct read_write_emulator_ops read_emultor = {
3765         .read_write_prepare = read_prepare,
3766         .read_write_emulate = read_emulate,
3767         .read_write_mmio = vcpu_mmio_read,
3768         .read_write_exit_mmio = read_exit_mmio,
3769 };
3770
3771 static struct read_write_emulator_ops write_emultor = {
3772         .read_write_emulate = write_emulate,
3773         .read_write_mmio = write_mmio,
3774         .read_write_exit_mmio = write_exit_mmio,
3775         .write = true,
3776 };
3777
3778 static int emulator_read_write_onepage(unsigned long addr, void *val,
3779                                        unsigned int bytes,
3780                                        struct x86_exception *exception,
3781                                        struct kvm_vcpu *vcpu,
3782                                        struct read_write_emulator_ops *ops)
3783 {
3784         gpa_t gpa;
3785         int handled, ret;
3786         bool write = ops->write;
3787         struct kvm_mmio_fragment *frag;
3788
3789         ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
3790
3791         if (ret < 0)
3792                 return X86EMUL_PROPAGATE_FAULT;
3793
3794         /* For APIC access vmexit */
3795         if (ret)
3796                 goto mmio;
3797
3798         if (ops->read_write_emulate(vcpu, gpa, val, bytes))
3799                 return X86EMUL_CONTINUE;
3800
3801 mmio:
3802         /*
3803          * Is this MMIO handled locally?
3804          */
3805         handled = ops->read_write_mmio(vcpu, gpa, bytes, val);
3806         if (handled == bytes)
3807                 return X86EMUL_CONTINUE;
3808
3809         gpa += handled;
3810         bytes -= handled;
3811         val += handled;
3812
3813         while (bytes) {
3814                 unsigned now = min(bytes, 8U);
3815
3816                 frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++];
3817                 frag->gpa = gpa;
3818                 frag->data = val;
3819                 frag->len = now;
3820
3821                 gpa += now;
3822                 val += now;
3823                 bytes -= now;
3824         }
3825         return X86EMUL_CONTINUE;
3826 }
3827
3828 int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr,
3829                         void *val, unsigned int bytes,
3830                         struct x86_exception *exception,
3831                         struct read_write_emulator_ops *ops)
3832 {
3833         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3834         gpa_t gpa;
3835         int rc;
3836
3837         if (ops->read_write_prepare &&
3838                   ops->read_write_prepare(vcpu, val, bytes))
3839                 return X86EMUL_CONTINUE;
3840
3841         vcpu->mmio_nr_fragments = 0;
3842
3843         /* Crossing a page boundary? */
3844         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
3845                 int now;
3846
3847                 now = -addr & ~PAGE_MASK;
3848                 rc = emulator_read_write_onepage(addr, val, now, exception,
3849                                                  vcpu, ops);
3850
3851                 if (rc != X86EMUL_CONTINUE)
3852                         return rc;
3853                 addr += now;
3854                 val += now;
3855                 bytes -= now;
3856         }
3857
3858         rc = emulator_read_write_onepage(addr, val, bytes, exception,
3859                                          vcpu, ops);
3860         if (rc != X86EMUL_CONTINUE)
3861                 return rc;
3862
3863         if (!vcpu->mmio_nr_fragments)
3864                 return rc;
3865
3866         gpa = vcpu->mmio_fragments[0].gpa;
3867
3868         vcpu->mmio_needed = 1;
3869         vcpu->mmio_cur_fragment = 0;
3870
3871         vcpu->run->mmio.len = vcpu->mmio_fragments[0].len;
3872         vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write;
3873         vcpu->run->exit_reason = KVM_EXIT_MMIO;
3874         vcpu->run->mmio.phys_addr = gpa;
3875
3876         return ops->read_write_exit_mmio(vcpu, gpa, val, bytes);
3877 }
3878
3879 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
3880                                   unsigned long addr,
3881                                   void *val,
3882                                   unsigned int bytes,
3883                                   struct x86_exception *exception)
3884 {
3885         return emulator_read_write(ctxt, addr, val, bytes,
3886                                    exception, &read_emultor);
3887 }
3888
3889 int emulator_write_emulated(struct x86_emulate_ctxt *ctxt,
3890                             unsigned long addr,
3891                             const void *val,
3892                             unsigned int bytes,
3893                             struct x86_exception *exception)
3894 {
3895         return emulator_read_write(ctxt, addr, (void *)val, bytes,
3896                                    exception, &write_emultor);
3897 }
3898
3899 #define CMPXCHG_TYPE(t, ptr, old, new) \
3900         (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
3901
3902 #ifdef CONFIG_X86_64
3903 #  define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
3904 #else
3905 #  define CMPXCHG64(ptr, old, new) \
3906         (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
3907 #endif
3908
3909 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
3910                                      unsigned long addr,
3911                                      const void *old,
3912                                      const void *new,
3913                                      unsigned int bytes,
3914                                      struct x86_exception *exception)
3915 {
3916         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3917         gpa_t gpa;
3918         struct page *page;
3919         char *kaddr;
3920         bool exchanged;
3921
3922         /* guests cmpxchg8b have to be emulated atomically */
3923         if (bytes > 8 || (bytes & (bytes - 1)))
3924                 goto emul_write;
3925
3926         gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
3927
3928         if (gpa == UNMAPPED_GVA ||
3929             (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3930                 goto emul_write;
3931
3932         if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
3933                 goto emul_write;
3934
3935         page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
3936         if (is_error_page(page)) {
3937                 kvm_release_page_clean(page);
3938                 goto emul_write;
3939         }
3940
3941         kaddr = kmap_atomic(page);
3942         kaddr += offset_in_page(gpa);
3943         switch (bytes) {
3944         case 1:
3945                 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
3946                 break;
3947         case 2:
3948                 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
3949                 break;
3950         case 4:
3951                 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
3952                 break;
3953         case 8:
3954                 exchanged = CMPXCHG64(kaddr, old, new);
3955                 break;
3956         default:
3957                 BUG();
3958         }
3959         kunmap_atomic(kaddr);
3960         kvm_release_page_dirty(page);
3961
3962         if (!exchanged)
3963                 return X86EMUL_CMPXCHG_FAILED;
3964
3965         kvm_mmu_pte_write(vcpu, gpa, new, bytes);
3966
3967         return X86EMUL_CONTINUE;
3968
3969 emul_write:
3970         printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
3971
3972         return emulator_write_emulated(ctxt, addr, new, bytes, exception);
3973 }
3974
3975 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
3976 {
3977         /* TODO: String I/O for in kernel device */
3978         int r;
3979
3980         if (vcpu->arch.pio.in)
3981                 r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port,
3982                                     vcpu->arch.pio.size, pd);
3983         else
3984                 r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS,
3985                                      vcpu->arch.pio.port, vcpu->arch.pio.size,
3986                                      pd);
3987         return r;
3988 }
3989
3990 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
3991                                unsigned short port, void *val,
3992                                unsigned int count, bool in)
3993 {
3994         trace_kvm_pio(!in, port, size, count);
3995
3996         vcpu->arch.pio.port = port;
3997         vcpu->arch.pio.in = in;
3998         vcpu->arch.pio.count  = count;
3999         vcpu->arch.pio.size = size;
4000
4001         if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
4002                 vcpu->arch.pio.count = 0;
4003                 return 1;
4004         }
4005
4006         vcpu->run->exit_reason = KVM_EXIT_IO;
4007         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
4008         vcpu->run->io.size = size;
4009         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
4010         vcpu->run->io.count = count;
4011         vcpu->run->io.port = port;
4012
4013         return 0;
4014 }
4015
4016 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
4017                                     int size, unsigned short port, void *val,
4018                                     unsigned int count)
4019 {
4020         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4021         int ret;
4022
4023         if (vcpu->arch.pio.count)
4024                 goto data_avail;
4025
4026         ret = emulator_pio_in_out(vcpu, size, port, val, count, true);
4027         if (ret) {
4028 data_avail:
4029                 memcpy(val, vcpu->arch.pio_data, size * count);
4030                 vcpu->arch.pio.count = 0;
4031                 return 1;
4032         }
4033
4034         return 0;
4035 }
4036
4037 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,
4038                                      int size, unsigned short port,
4039                                      const void *val, unsigned int count)
4040 {
4041         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4042
4043         memcpy(vcpu->arch.pio_data, val, size * count);
4044         return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
4045 }
4046
4047 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
4048 {
4049         return kvm_x86_ops->get_segment_base(vcpu, seg);
4050 }
4051
4052 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address)
4053 {
4054         kvm_mmu_invlpg(emul_to_vcpu(ctxt), address);
4055 }
4056
4057 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
4058 {
4059         if (!need_emulate_wbinvd(vcpu))
4060                 return X86EMUL_CONTINUE;
4061
4062         if (kvm_x86_ops->has_wbinvd_exit()) {
4063                 int cpu = get_cpu();
4064
4065                 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
4066                 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
4067                                 wbinvd_ipi, NULL, 1);
4068                 put_cpu();
4069                 cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
4070         } else
4071                 wbinvd();
4072         return X86EMUL_CONTINUE;
4073 }
4074 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
4075
4076 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt)
4077 {
4078         kvm_emulate_wbinvd(emul_to_vcpu(ctxt));
4079 }
4080
4081 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
4082 {
4083         return _kvm_get_dr(emul_to_vcpu(ctxt), dr, dest);
4084 }
4085
4086 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
4087 {
4088
4089         return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value);
4090 }
4091
4092 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
4093 {
4094         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
4095 }
4096
4097 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr)
4098 {
4099         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4100         unsigned long value;
4101
4102         switch (cr) {
4103         case 0:
4104                 value = kvm_read_cr0(vcpu);
4105                 break;
4106         case 2:
4107                 value = vcpu->arch.cr2;
4108                 break;
4109         case 3:
4110                 value = kvm_read_cr3(vcpu);
4111                 break;
4112         case 4:
4113                 value = kvm_read_cr4(vcpu);
4114                 break;
4115         case 8:
4116                 value = kvm_get_cr8(vcpu);
4117                 break;
4118         default:
4119                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
4120                 return 0;
4121         }
4122
4123         return value;
4124 }
4125
4126 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val)
4127 {
4128         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4129         int res = 0;
4130
4131         switch (cr) {
4132         case 0:
4133                 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
4134                 break;
4135         case 2:
4136                 vcpu->arch.cr2 = val;
4137                 break;
4138         case 3:
4139                 res = kvm_set_cr3(vcpu, val);
4140                 break;
4141         case 4:
4142                 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
4143                 break;
4144         case 8:
4145                 res = kvm_set_cr8(vcpu, val);
4146                 break;
4147         default:
4148                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
4149                 res = -1;
4150         }
4151
4152         return res;
4153 }
4154
4155 static void emulator_set_rflags(struct x86_emulate_ctxt *ctxt, ulong val)
4156 {
4157         kvm_set_rflags(emul_to_vcpu(ctxt), val);
4158 }
4159
4160 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt)
4161 {
4162         return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt));
4163 }
4164
4165 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4166 {
4167         kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt);
4168 }
4169
4170 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4171 {
4172         kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt);
4173 }
4174
4175 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4176 {
4177         kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt);
4178 }
4179
4180 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4181 {
4182         kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt);
4183 }
4184
4185 static unsigned long emulator_get_cached_segment_base(
4186         struct x86_emulate_ctxt *ctxt, int seg)
4187 {
4188         return get_segment_base(emul_to_vcpu(ctxt), seg);
4189 }
4190
4191 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
4192                                  struct desc_struct *desc, u32 *base3,
4193                                  int seg)
4194 {
4195         struct kvm_segment var;
4196
4197         kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
4198         *selector = var.selector;
4199
4200         if (var.unusable)
4201                 return false;
4202
4203         if (var.g)
4204                 var.limit >>= 12;
4205         set_desc_limit(desc, var.limit);
4206         set_desc_base(desc, (unsigned long)var.base);
4207 #ifdef CONFIG_X86_64
4208         if (base3)
4209                 *base3 = var.base >> 32;
4210 #endif
4211         desc->type = var.type;
4212         desc->s = var.s;
4213         desc->dpl = var.dpl;
4214         desc->p = var.present;
4215         desc->avl = var.avl;
4216         desc->l = var.l;
4217         desc->d = var.db;
4218         desc->g = var.g;
4219
4220         return true;
4221 }
4222
4223 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
4224                                  struct desc_struct *desc, u32 base3,
4225                                  int seg)
4226 {
4227         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4228         struct kvm_segment var;
4229
4230         var.selector = selector;
4231         var.base = get_desc_base(desc);
4232 #ifdef CONFIG_X86_64
4233         var.base |= ((u64)base3) << 32;
4234 #endif
4235         var.limit = get_desc_limit(desc);
4236         if (desc->g)
4237                 var.limit = (var.limit << 12) | 0xfff;
4238         var.type = desc->type;
4239         var.present = desc->p;
4240         var.dpl = desc->dpl;
4241         var.db = desc->d;
4242         var.s = desc->s;
4243         var.l = desc->l;
4244         var.g = desc->g;
4245         var.avl = desc->avl;
4246         var.present = desc->p;
4247         var.unusable = !var.present;
4248         var.padding = 0;
4249
4250         kvm_set_segment(vcpu, &var, seg);
4251         return;
4252 }
4253
4254 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
4255                             u32 msr_index, u64 *pdata)
4256 {
4257         return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
4258 }
4259
4260 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
4261                             u32 msr_index, u64 data)
4262 {
4263         return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data);
4264 }
4265
4266 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt,
4267                              u32 pmc, u64 *pdata)
4268 {
4269         return kvm_pmu_read_pmc(emul_to_vcpu(ctxt), pmc, pdata);
4270 }
4271
4272 static void emulator_halt(struct x86_emulate_ctxt *ctxt)
4273 {
4274         emul_to_vcpu(ctxt)->arch.halt_request = 1;
4275 }
4276
4277 static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt)
4278 {
4279         preempt_disable();
4280         kvm_load_guest_fpu(emul_to_vcpu(ctxt));
4281         /*
4282          * CR0.TS may reference the host fpu state, not the guest fpu state,
4283          * so it may be clear at this point.
4284          */
4285         clts();
4286 }
4287
4288 static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt)
4289 {
4290         preempt_enable();
4291 }
4292
4293 static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
4294                               struct x86_instruction_info *info,
4295                               enum x86_intercept_stage stage)
4296 {
4297         return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage);
4298 }
4299
4300 static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
4301                                u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
4302 {
4303         struct kvm_cpuid_entry2 *cpuid = NULL;
4304
4305         if (eax && ecx)
4306                 cpuid = kvm_find_cpuid_entry(emul_to_vcpu(ctxt),
4307                                             *eax, *ecx);
4308
4309         if (cpuid) {
4310                 *eax = cpuid->eax;
4311                 *ecx = cpuid->ecx;
4312                 if (ebx)
4313                         *ebx = cpuid->ebx;
4314                 if (edx)
4315                         *edx = cpuid->edx;
4316                 return true;
4317         }
4318
4319         return false;
4320 }
4321
4322 static struct x86_emulate_ops emulate_ops = {
4323         .read_std            = kvm_read_guest_virt_system,
4324         .write_std           = kvm_write_guest_virt_system,
4325         .fetch               = kvm_fetch_guest_virt,
4326         .read_emulated       = emulator_read_emulated,
4327         .write_emulated      = emulator_write_emulated,
4328         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
4329         .invlpg              = emulator_invlpg,
4330         .pio_in_emulated     = emulator_pio_in_emulated,
4331         .pio_out_emulated    = emulator_pio_out_emulated,
4332         .get_segment         = emulator_get_segment,
4333         .set_segment         = emulator_set_segment,
4334         .get_cached_segment_base = emulator_get_cached_segment_base,
4335         .get_gdt             = emulator_get_gdt,
4336         .get_idt             = emulator_get_idt,
4337         .set_gdt             = emulator_set_gdt,
4338         .set_idt             = emulator_set_idt,
4339         .get_cr              = emulator_get_cr,
4340         .set_cr              = emulator_set_cr,
4341         .set_rflags          = emulator_set_rflags,
4342         .cpl                 = emulator_get_cpl,
4343         .get_dr              = emulator_get_dr,
4344         .set_dr              = emulator_set_dr,
4345         .set_msr             = emulator_set_msr,
4346         .get_msr             = emulator_get_msr,
4347         .read_pmc            = emulator_read_pmc,
4348         .halt                = emulator_halt,
4349         .wbinvd              = emulator_wbinvd,
4350         .fix_hypercall       = emulator_fix_hypercall,
4351         .get_fpu             = emulator_get_fpu,
4352         .put_fpu             = emulator_put_fpu,
4353         .intercept           = emulator_intercept,
4354         .get_cpuid           = emulator_get_cpuid,
4355 };
4356
4357 static void cache_all_regs(struct kvm_vcpu *vcpu)
4358 {
4359         kvm_register_read(vcpu, VCPU_REGS_RAX);
4360         kvm_register_read(vcpu, VCPU_REGS_RSP);
4361         kvm_register_read(vcpu, VCPU_REGS_RIP);
4362         vcpu->arch.regs_dirty = ~0;
4363 }
4364
4365 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
4366 {
4367         u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask);
4368         /*
4369          * an sti; sti; sequence only disable interrupts for the first
4370          * instruction. So, if the last instruction, be it emulated or
4371          * not, left the system with the INT_STI flag enabled, it
4372          * means that the last instruction is an sti. We should not
4373          * leave the flag on in this case. The same goes for mov ss
4374          */
4375         if (!(int_shadow & mask))
4376                 kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
4377 }
4378
4379 static void inject_emulated_exception(struct kvm_vcpu *vcpu)
4380 {
4381         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4382         if (ctxt->exception.vector == PF_VECTOR)
4383                 kvm_propagate_fault(vcpu, &ctxt->exception);
4384         else if (ctxt->exception.error_code_valid)
4385                 kvm_queue_exception_e(vcpu, ctxt->exception.vector,
4386                                       ctxt->exception.error_code);
4387         else
4388                 kvm_queue_exception(vcpu, ctxt->exception.vector);
4389 }
4390
4391 static void init_decode_cache(struct x86_emulate_ctxt *ctxt,
4392                               const unsigned long *regs)
4393 {
4394         memset(&ctxt->twobyte, 0,
4395                (void *)&ctxt->regs - (void *)&ctxt->twobyte);
4396         memcpy(ctxt->regs, regs, sizeof(ctxt->regs));
4397
4398         ctxt->fetch.start = 0;
4399         ctxt->fetch.end = 0;
4400         ctxt->io_read.pos = 0;
4401         ctxt->io_read.end = 0;
4402         ctxt->mem_read.pos = 0;
4403         ctxt->mem_read.end = 0;
4404 }
4405
4406 static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
4407 {
4408         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4409         int cs_db, cs_l;
4410
4411         /*
4412          * TODO: fix emulate.c to use guest_read/write_register
4413          * instead of direct ->regs accesses, can save hundred cycles
4414          * on Intel for instructions that don't read/change RSP, for
4415          * for example.
4416          */
4417         cache_all_regs(vcpu);
4418
4419         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4420
4421         ctxt->eflags = kvm_get_rflags(vcpu);
4422         ctxt->eip = kvm_rip_read(vcpu);
4423         ctxt->mode = (!is_protmode(vcpu))               ? X86EMUL_MODE_REAL :
4424                      (ctxt->eflags & X86_EFLAGS_VM)     ? X86EMUL_MODE_VM86 :
4425                      cs_l                               ? X86EMUL_MODE_PROT64 :
4426                      cs_db                              ? X86EMUL_MODE_PROT32 :
4427                                                           X86EMUL_MODE_PROT16;
4428         ctxt->guest_mode = is_guest_mode(vcpu);
4429
4430         init_decode_cache(ctxt, vcpu->arch.regs);
4431         vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
4432 }
4433
4434 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
4435 {
4436         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4437         int ret;
4438
4439         init_emulate_ctxt(vcpu);
4440
4441         ctxt->op_bytes = 2;
4442         ctxt->ad_bytes = 2;
4443         ctxt->_eip = ctxt->eip + inc_eip;
4444         ret = emulate_int_real(ctxt, irq);
4445
4446         if (ret != X86EMUL_CONTINUE)
4447                 return EMULATE_FAIL;
4448
4449         ctxt->eip = ctxt->_eip;
4450         memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
4451         kvm_rip_write(vcpu, ctxt->eip);
4452         kvm_set_rflags(vcpu, ctxt->eflags);
4453
4454         if (irq == NMI_VECTOR)
4455                 vcpu->arch.nmi_pending = 0;
4456         else
4457                 vcpu->arch.interrupt.pending = false;
4458
4459         return EMULATE_DONE;
4460 }
4461 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
4462
4463 static int handle_emulation_failure(struct kvm_vcpu *vcpu)
4464 {
4465         int r = EMULATE_DONE;
4466
4467         ++vcpu->stat.insn_emulation_fail;
4468         trace_kvm_emulate_insn_failed(vcpu);
4469         if (!is_guest_mode(vcpu)) {
4470                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4471                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
4472                 vcpu->run->internal.ndata = 0;
4473                 r = EMULATE_FAIL;
4474         }
4475         kvm_queue_exception(vcpu, UD_VECTOR);
4476
4477         return r;
4478 }
4479
4480 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva)
4481 {
4482         gpa_t gpa;
4483
4484         if (tdp_enabled)
4485                 return false;
4486
4487         /*
4488          * if emulation was due to access to shadowed page table
4489          * and it failed try to unshadow page and re-entetr the
4490          * guest to let CPU execute the instruction.
4491          */
4492         if (kvm_mmu_unprotect_page_virt(vcpu, gva))
4493                 return true;
4494
4495         gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL);
4496
4497         if (gpa == UNMAPPED_GVA)
4498                 return true; /* let cpu generate fault */
4499
4500         if (!kvm_is_error_hva(gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT)))
4501                 return true;
4502
4503         return false;
4504 }
4505
4506 static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
4507                               unsigned long cr2,  int emulation_type)
4508 {
4509         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4510         unsigned long last_retry_eip, last_retry_addr, gpa = cr2;
4511
4512         last_retry_eip = vcpu->arch.last_retry_eip;
4513         last_retry_addr = vcpu->arch.last_retry_addr;
4514
4515         /*
4516          * If the emulation is caused by #PF and it is non-page_table
4517          * writing instruction, it means the VM-EXIT is caused by shadow
4518          * page protected, we can zap the shadow page and retry this
4519          * instruction directly.
4520          *
4521          * Note: if the guest uses a non-page-table modifying instruction
4522          * on the PDE that points to the instruction, then we will unmap
4523          * the instruction and go to an infinite loop. So, we cache the
4524          * last retried eip and the last fault address, if we meet the eip
4525          * and the address again, we can break out of the potential infinite
4526          * loop.
4527          */
4528         vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0;
4529
4530         if (!(emulation_type & EMULTYPE_RETRY))
4531                 return false;
4532
4533         if (x86_page_table_writing_insn(ctxt))
4534                 return false;
4535
4536         if (ctxt->eip == last_retry_eip && last_retry_addr == cr2)
4537                 return false;
4538
4539         vcpu->arch.last_retry_eip = ctxt->eip;
4540         vcpu->arch.last_retry_addr = cr2;
4541
4542         if (!vcpu->arch.mmu.direct_map)
4543                 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);
4544
4545         kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT);
4546
4547         return true;
4548 }
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                 memcpy(ctxt->regs, vcpu->arch.regs, sizeof ctxt->regs);
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                 r = EMULATE_DO_MMIO;
4623         } else if (vcpu->mmio_needed) {
4624                 if (!vcpu->mmio_is_write)
4625                         writeback = false;
4626                 r = EMULATE_DO_MMIO;
4627         } else if (r == EMULATION_RESTART)
4628                 goto restart;
4629         else
4630                 r = EMULATE_DONE;
4631
4632         if (writeback) {
4633                 toggle_interruptibility(vcpu, ctxt->interruptibility);
4634                 kvm_set_rflags(vcpu, ctxt->eflags);
4635                 kvm_make_request(KVM_REQ_EVENT, vcpu);
4636                 memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
4637                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
4638                 kvm_rip_write(vcpu, ctxt->eip);
4639         } else
4640                 vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
4641
4642         return r;
4643 }
4644 EXPORT_SYMBOL_GPL(x86_emulate_instruction);
4645
4646 int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
4647 {
4648         unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
4649         int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt,
4650                                             size, port, &val, 1);
4651         /* do not return to emulator after return from userspace */
4652         vcpu->arch.pio.count = 0;
4653         return ret;
4654 }
4655 EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
4656
4657 static void tsc_bad(void *info)
4658 {
4659         __this_cpu_write(cpu_tsc_khz, 0);
4660 }
4661
4662 static void tsc_khz_changed(void *data)
4663 {
4664         struct cpufreq_freqs *freq = data;
4665         unsigned long khz = 0;
4666
4667         if (data)
4668                 khz = freq->new;
4669         else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4670                 khz = cpufreq_quick_get(raw_smp_processor_id());
4671         if (!khz)
4672                 khz = tsc_khz;
4673         __this_cpu_write(cpu_tsc_khz, khz);
4674 }
4675
4676 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
4677                                      void *data)
4678 {
4679         struct cpufreq_freqs *freq = data;
4680         struct kvm *kvm;
4681         struct kvm_vcpu *vcpu;
4682         int i, send_ipi = 0;
4683
4684         /*
4685          * We allow guests to temporarily run on slowing clocks,
4686          * provided we notify them after, or to run on accelerating
4687          * clocks, provided we notify them before.  Thus time never
4688          * goes backwards.
4689          *
4690          * However, we have a problem.  We can't atomically update
4691          * the frequency of a given CPU from this function; it is
4692          * merely a notifier, which can be called from any CPU.
4693          * Changing the TSC frequency at arbitrary points in time
4694          * requires a recomputation of local variables related to
4695          * the TSC for each VCPU.  We must flag these local variables
4696          * to be updated and be sure the update takes place with the
4697          * new frequency before any guests proceed.
4698          *
4699          * Unfortunately, the combination of hotplug CPU and frequency
4700          * change creates an intractable locking scenario; the order
4701          * of when these callouts happen is undefined with respect to
4702          * CPU hotplug, and they can race with each other.  As such,
4703          * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
4704          * undefined; you can actually have a CPU frequency change take
4705          * place in between the computation of X and the setting of the
4706          * variable.  To protect against this problem, all updates of
4707          * the per_cpu tsc_khz variable are done in an interrupt
4708          * protected IPI, and all callers wishing to update the value
4709          * must wait for a synchronous IPI to complete (which is trivial
4710          * if the caller is on the CPU already).  This establishes the
4711          * necessary total order on variable updates.
4712          *
4713          * Note that because a guest time update may take place
4714          * anytime after the setting of the VCPU's request bit, the
4715          * correct TSC value must be set before the request.  However,
4716          * to ensure the update actually makes it to any guest which
4717          * starts running in hardware virtualization between the set
4718          * and the acquisition of the spinlock, we must also ping the
4719          * CPU after setting the request bit.
4720          *
4721          */
4722
4723         if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
4724                 return 0;
4725         if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
4726                 return 0;
4727
4728         smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4729
4730         raw_spin_lock(&kvm_lock);
4731         list_for_each_entry(kvm, &vm_list, vm_list) {
4732                 kvm_for_each_vcpu(i, vcpu, kvm) {
4733                         if (vcpu->cpu != freq->cpu)
4734                                 continue;
4735                         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
4736                         if (vcpu->cpu != smp_processor_id())
4737                                 send_ipi = 1;
4738                 }
4739         }
4740         raw_spin_unlock(&kvm_lock);
4741
4742         if (freq->old < freq->new && send_ipi) {
4743                 /*
4744                  * We upscale the frequency.  Must make the guest
4745                  * doesn't see old kvmclock values while running with
4746                  * the new frequency, otherwise we risk the guest sees
4747                  * time go backwards.
4748                  *
4749                  * In case we update the frequency for another cpu
4750                  * (which might be in guest context) send an interrupt
4751                  * to kick the cpu out of guest context.  Next time
4752                  * guest context is entered kvmclock will be updated,
4753                  * so the guest will not see stale values.
4754                  */
4755                 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4756         }
4757         return 0;
4758 }
4759
4760 static struct notifier_block kvmclock_cpufreq_notifier_block = {
4761         .notifier_call  = kvmclock_cpufreq_notifier
4762 };
4763
4764 static int kvmclock_cpu_notifier(struct notifier_block *nfb,
4765                                         unsigned long action, void *hcpu)
4766 {
4767         unsigned int cpu = (unsigned long)hcpu;
4768
4769         switch (action) {
4770                 case CPU_ONLINE:
4771                 case CPU_DOWN_FAILED:
4772                         smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4773                         break;
4774                 case CPU_DOWN_PREPARE:
4775                         smp_call_function_single(cpu, tsc_bad, NULL, 1);
4776                         break;
4777         }
4778         return NOTIFY_OK;
4779 }
4780
4781 static struct notifier_block kvmclock_cpu_notifier_block = {
4782         .notifier_call  = kvmclock_cpu_notifier,
4783         .priority = -INT_MAX
4784 };
4785
4786 static void kvm_timer_init(void)
4787 {
4788         int cpu;
4789
4790         max_tsc_khz = tsc_khz;
4791         register_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4792         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
4793 #ifdef CONFIG_CPU_FREQ
4794                 struct cpufreq_policy policy;
4795                 memset(&policy, 0, sizeof(policy));
4796                 cpu = get_cpu();
4797                 cpufreq_get_policy(&policy, cpu);
4798                 if (policy.cpuinfo.max_freq)
4799                         max_tsc_khz = policy.cpuinfo.max_freq;
4800                 put_cpu();
4801 #endif
4802                 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
4803                                           CPUFREQ_TRANSITION_NOTIFIER);
4804         }
4805         pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
4806         for_each_online_cpu(cpu)
4807                 smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4808 }
4809
4810 static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
4811
4812 int kvm_is_in_guest(void)
4813 {
4814         return __this_cpu_read(current_vcpu) != NULL;
4815 }
4816
4817 static int kvm_is_user_mode(void)
4818 {
4819         int user_mode = 3;
4820
4821         if (__this_cpu_read(current_vcpu))
4822                 user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu));
4823
4824         return user_mode != 0;
4825 }
4826
4827 static unsigned long kvm_get_guest_ip(void)
4828 {
4829         unsigned long ip = 0;
4830
4831         if (__this_cpu_read(current_vcpu))
4832                 ip = kvm_rip_read(__this_cpu_read(current_vcpu));
4833
4834         return ip;
4835 }
4836
4837 static struct perf_guest_info_callbacks kvm_guest_cbs = {
4838         .is_in_guest            = kvm_is_in_guest,
4839         .is_user_mode           = kvm_is_user_mode,
4840         .get_guest_ip           = kvm_get_guest_ip,
4841 };
4842
4843 void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
4844 {
4845         __this_cpu_write(current_vcpu, vcpu);
4846 }
4847 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
4848
4849 void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
4850 {
4851         __this_cpu_write(current_vcpu, NULL);
4852 }
4853 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
4854
4855 static void kvm_set_mmio_spte_mask(void)
4856 {
4857         u64 mask;
4858         int maxphyaddr = boot_cpu_data.x86_phys_bits;
4859
4860         /*
4861          * Set the reserved bits and the present bit of an paging-structure
4862          * entry to generate page fault with PFER.RSV = 1.
4863          */
4864         mask = ((1ull << (62 - maxphyaddr + 1)) - 1) << maxphyaddr;
4865         mask |= 1ull;
4866
4867 #ifdef CONFIG_X86_64
4868         /*
4869          * If reserved bit is not supported, clear the present bit to disable
4870          * mmio page fault.
4871          */
4872         if (maxphyaddr == 52)
4873                 mask &= ~1ull;
4874 #endif
4875
4876         kvm_mmu_set_mmio_spte_mask(mask);
4877 }
4878
4879 int kvm_arch_init(void *opaque)
4880 {
4881         int r;
4882         struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
4883
4884         if (kvm_x86_ops) {
4885                 printk(KERN_ERR "kvm: already loaded the other module\n");
4886                 r = -EEXIST;
4887                 goto out;
4888         }
4889
4890         if (!ops->cpu_has_kvm_support()) {
4891                 printk(KERN_ERR "kvm: no hardware support\n");
4892                 r = -EOPNOTSUPP;
4893                 goto out;
4894         }
4895         if (ops->disabled_by_bios()) {
4896                 printk(KERN_ERR "kvm: disabled by bios\n");
4897                 r = -EOPNOTSUPP;
4898                 goto out;
4899         }
4900
4901         r = kvm_mmu_module_init();
4902         if (r)
4903                 goto out;
4904
4905         kvm_set_mmio_spte_mask();
4906         kvm_init_msr_list();
4907
4908         kvm_x86_ops = ops;
4909         kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
4910                         PT_DIRTY_MASK, PT64_NX_MASK, 0);
4911
4912         kvm_timer_init();
4913
4914         perf_register_guest_info_callbacks(&kvm_guest_cbs);
4915
4916         if (cpu_has_xsave)
4917                 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
4918
4919         return 0;
4920
4921 out:
4922         return r;
4923 }
4924
4925 void kvm_arch_exit(void)
4926 {
4927         perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
4928
4929         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4930                 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
4931                                             CPUFREQ_TRANSITION_NOTIFIER);
4932         unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4933         kvm_x86_ops = NULL;
4934         kvm_mmu_module_exit();
4935 }
4936
4937 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
4938 {
4939         ++vcpu->stat.halt_exits;
4940         if (irqchip_in_kernel(vcpu->kvm)) {
4941                 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
4942                 return 1;
4943         } else {
4944                 vcpu->run->exit_reason = KVM_EXIT_HLT;
4945                 return 0;
4946         }
4947 }
4948 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
4949
4950 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
4951 {
4952         u64 param, ingpa, outgpa, ret;
4953         uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
4954         bool fast, longmode;
4955         int cs_db, cs_l;
4956
4957         /*
4958          * hypercall generates UD from non zero cpl and real mode
4959          * per HYPER-V spec
4960          */
4961         if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
4962                 kvm_queue_exception(vcpu, UD_VECTOR);
4963                 return 0;
4964         }
4965
4966         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4967         longmode = is_long_mode(vcpu) && cs_l == 1;
4968
4969         if (!longmode) {
4970                 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
4971                         (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
4972                 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
4973                         (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
4974                 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
4975                         (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
4976         }
4977 #ifdef CONFIG_X86_64
4978         else {
4979                 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
4980                 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
4981                 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
4982         }
4983 #endif
4984
4985         code = param & 0xffff;
4986         fast = (param >> 16) & 0x1;
4987         rep_cnt = (param >> 32) & 0xfff;
4988         rep_idx = (param >> 48) & 0xfff;
4989
4990         trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
4991
4992         switch (code) {
4993         case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
4994                 kvm_vcpu_on_spin(vcpu);
4995                 break;
4996         default:
4997                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
4998                 break;
4999         }
5000
5001         ret = res | (((u64)rep_done & 0xfff) << 32);
5002         if (longmode) {
5003                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
5004         } else {
5005                 kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32);
5006                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff);
5007         }
5008
5009         return 1;
5010 }
5011
5012 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
5013 {
5014         unsigned long nr, a0, a1, a2, a3, ret;
5015         int r = 1;
5016
5017         if (kvm_hv_hypercall_enabled(vcpu->kvm))
5018                 return kvm_hv_hypercall(vcpu);
5019
5020         nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
5021         a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
5022         a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
5023         a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
5024         a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
5025
5026         trace_kvm_hypercall(nr, a0, a1, a2, a3);
5027
5028         if (!is_long_mode(vcpu)) {
5029                 nr &= 0xFFFFFFFF;
5030                 a0 &= 0xFFFFFFFF;
5031                 a1 &= 0xFFFFFFFF;
5032                 a2 &= 0xFFFFFFFF;
5033                 a3 &= 0xFFFFFFFF;
5034         }
5035
5036         if (kvm_x86_ops->get_cpl(vcpu) != 0) {
5037                 ret = -KVM_EPERM;
5038                 goto out;
5039         }
5040
5041         switch (nr) {
5042         case KVM_HC_VAPIC_POLL_IRQ:
5043                 ret = 0;
5044                 break;
5045         default:
5046                 ret = -KVM_ENOSYS;
5047                 break;
5048         }
5049 out:
5050         kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
5051         ++vcpu->stat.hypercalls;
5052         return r;
5053 }
5054 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
5055
5056 int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
5057 {
5058         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5059         char instruction[3];
5060         unsigned long rip = kvm_rip_read(vcpu);
5061
5062         /*
5063          * Blow out the MMU to ensure that no other VCPU has an active mapping
5064          * to ensure that the updated hypercall appears atomically across all
5065          * VCPUs.
5066          */
5067         kvm_mmu_zap_all(vcpu->kvm);
5068
5069         kvm_x86_ops->patch_hypercall(vcpu, instruction);
5070
5071         return emulator_write_emulated(ctxt, rip, instruction, 3, NULL);
5072 }
5073
5074 /*
5075  * Check if userspace requested an interrupt window, and that the
5076  * interrupt window is open.
5077  *
5078  * No need to exit to userspace if we already have an interrupt queued.
5079  */
5080 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
5081 {
5082         return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
5083                 vcpu->run->request_interrupt_window &&
5084                 kvm_arch_interrupt_allowed(vcpu));
5085 }
5086
5087 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
5088 {
5089         struct kvm_run *kvm_run = vcpu->run;
5090
5091         kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
5092         kvm_run->cr8 = kvm_get_cr8(vcpu);
5093         kvm_run->apic_base = kvm_get_apic_base(vcpu);
5094         if (irqchip_in_kernel(vcpu->kvm))
5095                 kvm_run->ready_for_interrupt_injection = 1;
5096         else
5097                 kvm_run->ready_for_interrupt_injection =
5098                         kvm_arch_interrupt_allowed(vcpu) &&
5099                         !kvm_cpu_has_interrupt(vcpu) &&
5100                         !kvm_event_needs_reinjection(vcpu);
5101 }
5102
5103 static void vapic_enter(struct kvm_vcpu *vcpu)
5104 {
5105         struct kvm_lapic *apic = vcpu->arch.apic;
5106         struct page *page;
5107
5108         if (!apic || !apic->vapic_addr)
5109                 return;
5110
5111         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5112
5113         vcpu->arch.apic->vapic_page = page;
5114 }
5115
5116 static void vapic_exit(struct kvm_vcpu *vcpu)
5117 {
5118         struct kvm_lapic *apic = vcpu->arch.apic;
5119         int idx;
5120
5121         if (!apic || !apic->vapic_addr)
5122                 return;
5123
5124         idx = srcu_read_lock(&vcpu->kvm->srcu);
5125         kvm_release_page_dirty(apic->vapic_page);
5126         mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5127         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5128 }
5129
5130 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
5131 {
5132         int max_irr, tpr;
5133
5134         if (!kvm_x86_ops->update_cr8_intercept)
5135                 return;
5136
5137         if (!vcpu->arch.apic)
5138                 return;
5139
5140         if (!vcpu->arch.apic->vapic_addr)
5141                 max_irr = kvm_lapic_find_highest_irr(vcpu);
5142         else
5143                 max_irr = -1;
5144
5145         if (max_irr != -1)
5146                 max_irr >>= 4;
5147
5148         tpr = kvm_lapic_get_cr8(vcpu);
5149
5150         kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
5151 }
5152
5153 static void inject_pending_event(struct kvm_vcpu *vcpu)
5154 {
5155         /* try to reinject previous events if any */
5156         if (vcpu->arch.exception.pending) {
5157                 trace_kvm_inj_exception(vcpu->arch.exception.nr,
5158                                         vcpu->arch.exception.has_error_code,
5159                                         vcpu->arch.exception.error_code);
5160                 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
5161                                           vcpu->arch.exception.has_error_code,
5162                                           vcpu->arch.exception.error_code,
5163                                           vcpu->arch.exception.reinject);
5164                 return;
5165         }
5166
5167         if (vcpu->arch.nmi_injected) {
5168                 kvm_x86_ops->set_nmi(vcpu);
5169                 return;
5170         }
5171
5172         if (vcpu->arch.interrupt.pending) {
5173                 kvm_x86_ops->set_irq(vcpu);
5174                 return;
5175         }
5176
5177         /* try to inject new event if pending */
5178         if (vcpu->arch.nmi_pending) {
5179                 if (kvm_x86_ops->nmi_allowed(vcpu)) {
5180                         --vcpu->arch.nmi_pending;
5181                         vcpu->arch.nmi_injected = true;
5182                         kvm_x86_ops->set_nmi(vcpu);
5183                 }
5184         } else if (kvm_cpu_has_interrupt(vcpu)) {
5185                 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
5186                         kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
5187                                             false);
5188                         kvm_x86_ops->set_irq(vcpu);
5189                 }
5190         }
5191 }
5192
5193 static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu)
5194 {
5195         if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
5196                         !vcpu->guest_xcr0_loaded) {
5197                 /* kvm_set_xcr() also depends on this */
5198                 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
5199                 vcpu->guest_xcr0_loaded = 1;
5200         }
5201 }
5202
5203 static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu)
5204 {
5205         if (vcpu->guest_xcr0_loaded) {
5206                 if (vcpu->arch.xcr0 != host_xcr0)
5207                         xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
5208                 vcpu->guest_xcr0_loaded = 0;
5209         }
5210 }
5211
5212 static void process_nmi(struct kvm_vcpu *vcpu)
5213 {
5214         unsigned limit = 2;
5215
5216         /*
5217          * x86 is limited to one NMI running, and one NMI pending after it.
5218          * If an NMI is already in progress, limit further NMIs to just one.
5219          * Otherwise, allow two (and we'll inject the first one immediately).
5220          */
5221         if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected)
5222                 limit = 1;
5223
5224         vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0);
5225         vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit);
5226         kvm_make_request(KVM_REQ_EVENT, vcpu);
5227 }
5228
5229 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
5230 {
5231         int r;
5232         bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
5233                 vcpu->run->request_interrupt_window;
5234         bool req_immediate_exit = 0;
5235
5236         if (vcpu->requests) {
5237                 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
5238                         kvm_mmu_unload(vcpu);
5239                 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
5240                         __kvm_migrate_timers(vcpu);
5241                 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
5242                         r = kvm_guest_time_update(vcpu);
5243                         if (unlikely(r))
5244                                 goto out;
5245                 }
5246                 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
5247                         kvm_mmu_sync_roots(vcpu);
5248                 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
5249                         kvm_x86_ops->tlb_flush(vcpu);
5250                 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
5251                         vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
5252                         r = 0;
5253                         goto out;
5254                 }
5255                 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
5256                         vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
5257                         r = 0;
5258                         goto out;
5259                 }
5260                 if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) {
5261                         vcpu->fpu_active = 0;
5262                         kvm_x86_ops->fpu_deactivate(vcpu);
5263                 }
5264                 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
5265                         /* Page is swapped out. Do synthetic halt */
5266                         vcpu->arch.apf.halted = true;
5267                         r = 1;
5268                         goto out;
5269                 }
5270                 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
5271                         record_steal_time(vcpu);
5272                 if (kvm_check_request(KVM_REQ_NMI, vcpu))
5273                         process_nmi(vcpu);
5274                 req_immediate_exit =
5275                         kvm_check_request(KVM_REQ_IMMEDIATE_EXIT, vcpu);
5276                 if (kvm_check_request(KVM_REQ_PMU, vcpu))
5277                         kvm_handle_pmu_event(vcpu);
5278                 if (kvm_check_request(KVM_REQ_PMI, vcpu))
5279                         kvm_deliver_pmi(vcpu);
5280         }
5281
5282         if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
5283                 inject_pending_event(vcpu);
5284
5285                 /* enable NMI/IRQ window open exits if needed */
5286                 if (vcpu->arch.nmi_pending)
5287                         kvm_x86_ops->enable_nmi_window(vcpu);
5288                 else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
5289                         kvm_x86_ops->enable_irq_window(vcpu);
5290
5291                 if (kvm_lapic_enabled(vcpu)) {
5292                         update_cr8_intercept(vcpu);
5293                         kvm_lapic_sync_to_vapic(vcpu);
5294                 }
5295         }
5296
5297         r = kvm_mmu_reload(vcpu);
5298         if (unlikely(r)) {
5299                 kvm_x86_ops->cancel_injection(vcpu);
5300                 goto out;
5301         }
5302
5303         preempt_disable();
5304
5305         kvm_x86_ops->prepare_guest_switch(vcpu);
5306         if (vcpu->fpu_active)
5307                 kvm_load_guest_fpu(vcpu);
5308         kvm_load_guest_xcr0(vcpu);
5309
5310         vcpu->mode = IN_GUEST_MODE;
5311
5312         /* We should set ->mode before check ->requests,
5313          * see the comment in make_all_cpus_request.
5314          */
5315         smp_mb();
5316
5317         local_irq_disable();
5318
5319         if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
5320             || need_resched() || signal_pending(current)) {
5321                 vcpu->mode = OUTSIDE_GUEST_MODE;
5322                 smp_wmb();
5323                 local_irq_enable();
5324                 preempt_enable();
5325                 kvm_x86_ops->cancel_injection(vcpu);
5326                 r = 1;
5327                 goto out;
5328         }
5329
5330         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5331
5332         if (req_immediate_exit)
5333                 smp_send_reschedule(vcpu->cpu);
5334
5335         kvm_guest_enter();
5336
5337         if (unlikely(vcpu->arch.switch_db_regs)) {
5338                 set_debugreg(0, 7);
5339                 set_debugreg(vcpu->arch.eff_db[0], 0);
5340                 set_debugreg(vcpu->arch.eff_db[1], 1);
5341                 set_debugreg(vcpu->arch.eff_db[2], 2);
5342                 set_debugreg(vcpu->arch.eff_db[3], 3);
5343         }
5344
5345         trace_kvm_entry(vcpu->vcpu_id);
5346         kvm_x86_ops->run(vcpu);
5347
5348         /*
5349          * If the guest has used debug registers, at least dr7
5350          * will be disabled while returning to the host.
5351          * If we don't have active breakpoints in the host, we don't
5352          * care about the messed up debug address registers. But if
5353          * we have some of them active, restore the old state.
5354          */
5355         if (hw_breakpoint_active())
5356                 hw_breakpoint_restore();
5357
5358         vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu);
5359
5360         vcpu->mode = OUTSIDE_GUEST_MODE;
5361         smp_wmb();
5362         local_irq_enable();
5363
5364         ++vcpu->stat.exits;
5365
5366         /*
5367          * We must have an instruction between local_irq_enable() and
5368          * kvm_guest_exit(), so the timer interrupt isn't delayed by
5369          * the interrupt shadow.  The stat.exits increment will do nicely.
5370          * But we need to prevent reordering, hence this barrier():
5371          */
5372         barrier();
5373
5374         kvm_guest_exit();
5375
5376         preempt_enable();
5377
5378         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5379
5380         /*
5381          * Profile KVM exit RIPs:
5382          */
5383         if (unlikely(prof_on == KVM_PROFILING)) {
5384                 unsigned long rip = kvm_rip_read(vcpu);
5385                 profile_hit(KVM_PROFILING, (void *)rip);
5386         }
5387
5388         if (unlikely(vcpu->arch.tsc_always_catchup))
5389                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
5390
5391         kvm_lapic_sync_from_vapic(vcpu);
5392
5393         r = kvm_x86_ops->handle_exit(vcpu);
5394 out:
5395         return r;
5396 }
5397
5398
5399 static int __vcpu_run(struct kvm_vcpu *vcpu)
5400 {
5401         int r;
5402         struct kvm *kvm = vcpu->kvm;
5403
5404         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
5405                 pr_debug("vcpu %d received sipi with vector # %x\n",
5406                          vcpu->vcpu_id, vcpu->arch.sipi_vector);
5407                 kvm_lapic_reset(vcpu);
5408                 r = kvm_arch_vcpu_reset(vcpu);
5409                 if (r)
5410                         return r;
5411                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5412         }
5413
5414         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5415         vapic_enter(vcpu);
5416
5417         r = 1;
5418         while (r > 0) {
5419                 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
5420                     !vcpu->arch.apf.halted)
5421                         r = vcpu_enter_guest(vcpu);
5422                 else {
5423                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5424                         kvm_vcpu_block(vcpu);
5425                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5426                         if (kvm_check_request(KVM_REQ_UNHALT, vcpu))
5427                         {
5428                                 switch(vcpu->arch.mp_state) {
5429                                 case KVM_MP_STATE_HALTED:
5430                                         vcpu->arch.mp_state =
5431                                                 KVM_MP_STATE_RUNNABLE;
5432                                 case KVM_MP_STATE_RUNNABLE:
5433                                         vcpu->arch.apf.halted = false;
5434                                         break;
5435                                 case KVM_MP_STATE_SIPI_RECEIVED:
5436                                 default:
5437                                         r = -EINTR;
5438                                         break;
5439                                 }
5440                         }
5441                 }
5442
5443                 if (r <= 0)
5444                         break;
5445
5446                 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
5447                 if (kvm_cpu_has_pending_timer(vcpu))
5448                         kvm_inject_pending_timer_irqs(vcpu);
5449
5450                 if (dm_request_for_irq_injection(vcpu)) {
5451                         r = -EINTR;
5452                         vcpu->run->exit_reason = KVM_EXIT_INTR;
5453                         ++vcpu->stat.request_irq_exits;
5454                 }
5455
5456                 kvm_check_async_pf_completion(vcpu);
5457
5458                 if (signal_pending(current)) {
5459                         r = -EINTR;
5460                         vcpu->run->exit_reason = KVM_EXIT_INTR;
5461                         ++vcpu->stat.signal_exits;
5462                 }
5463                 if (need_resched()) {
5464                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5465                         kvm_resched(vcpu);
5466                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5467                 }
5468         }
5469
5470         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5471
5472         vapic_exit(vcpu);
5473
5474         return r;
5475 }
5476
5477 /*
5478  * Implements the following, as a state machine:
5479  *
5480  * read:
5481  *   for each fragment
5482  *     write gpa, len
5483  *     exit
5484  *     copy data
5485  *   execute insn
5486  *
5487  * write:
5488  *   for each fragment
5489  *      write gpa, len
5490  *      copy data
5491  *      exit
5492  */
5493 static int complete_mmio(struct kvm_vcpu *vcpu)
5494 {
5495         struct kvm_run *run = vcpu->run;
5496         struct kvm_mmio_fragment *frag;
5497         int r;
5498
5499         if (!(vcpu->arch.pio.count || vcpu->mmio_needed))
5500                 return 1;
5501
5502         if (vcpu->mmio_needed) {
5503                 /* Complete previous fragment */
5504                 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment++];
5505                 if (!vcpu->mmio_is_write)
5506                         memcpy(frag->data, run->mmio.data, frag->len);
5507                 if (vcpu->mmio_cur_fragment == vcpu->mmio_nr_fragments) {
5508                         vcpu->mmio_needed = 0;
5509                         if (vcpu->mmio_is_write)
5510                                 return 1;
5511                         vcpu->mmio_read_completed = 1;
5512                         goto done;
5513                 }
5514                 /* Initiate next fragment */
5515                 ++frag;
5516                 run->exit_reason = KVM_EXIT_MMIO;
5517                 run->mmio.phys_addr = frag->gpa;
5518                 if (vcpu->mmio_is_write)
5519                         memcpy(run->mmio.data, frag->data, frag->len);
5520                 run->mmio.len = frag->len;
5521                 run->mmio.is_write = vcpu->mmio_is_write;
5522                 return 0;
5523
5524         }
5525 done:
5526         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5527         r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
5528         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5529         if (r != EMULATE_DONE)
5530                 return 0;
5531         return 1;
5532 }
5533
5534 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
5535 {
5536         int r;
5537         sigset_t sigsaved;
5538
5539         if (!tsk_used_math(current) && init_fpu(current))
5540                 return -ENOMEM;
5541
5542         if (vcpu->sigset_active)
5543                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
5544
5545         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
5546                 kvm_vcpu_block(vcpu);
5547                 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
5548                 r = -EAGAIN;
5549                 goto out;
5550         }
5551
5552         /* re-sync apic's tpr */
5553         if (!irqchip_in_kernel(vcpu->kvm)) {
5554                 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
5555                         r = -EINVAL;
5556                         goto out;
5557                 }
5558         }
5559
5560         r = complete_mmio(vcpu);
5561         if (r <= 0)
5562                 goto out;
5563
5564         r = __vcpu_run(vcpu);
5565
5566 out:
5567         post_kvm_run_save(vcpu);
5568         if (vcpu->sigset_active)
5569                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
5570
5571         return r;
5572 }
5573
5574 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5575 {
5576         if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
5577                 /*
5578                  * We are here if userspace calls get_regs() in the middle of
5579                  * instruction emulation. Registers state needs to be copied
5580                  * back from emulation context to vcpu. Usrapace shouldn't do
5581                  * that usually, but some bad designed PV devices (vmware
5582                  * backdoor interface) need this to work
5583                  */
5584                 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
5585                 memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
5586                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
5587         }
5588         regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
5589         regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
5590         regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
5591         regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
5592         regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
5593         regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
5594         regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
5595         regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
5596 #ifdef CONFIG_X86_64
5597         regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
5598         regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
5599         regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
5600         regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
5601         regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
5602         regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
5603         regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
5604         regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
5605 #endif
5606
5607         regs->rip = kvm_rip_read(vcpu);
5608         regs->rflags = kvm_get_rflags(vcpu);
5609
5610         return 0;
5611 }
5612
5613 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5614 {
5615         vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
5616         vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
5617
5618         kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
5619         kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
5620         kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
5621         kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
5622         kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
5623         kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
5624         kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
5625         kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
5626 #ifdef CONFIG_X86_64
5627         kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
5628         kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
5629         kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
5630         kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
5631         kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
5632         kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
5633         kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
5634         kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
5635 #endif
5636
5637         kvm_rip_write(vcpu, regs->rip);
5638         kvm_set_rflags(vcpu, regs->rflags);
5639
5640         vcpu->arch.exception.pending = false;
5641
5642         kvm_make_request(KVM_REQ_EVENT, vcpu);
5643
5644         return 0;
5645 }
5646
5647 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
5648 {
5649         struct kvm_segment cs;
5650
5651         kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
5652         *db = cs.db;
5653         *l = cs.l;
5654 }
5655 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
5656
5657 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
5658                                   struct kvm_sregs *sregs)
5659 {
5660         struct desc_ptr dt;
5661
5662         kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5663         kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5664         kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5665         kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5666         kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5667         kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5668
5669         kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5670         kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5671
5672         kvm_x86_ops->get_idt(vcpu, &dt);
5673         sregs->idt.limit = dt.size;
5674         sregs->idt.base = dt.address;
5675         kvm_x86_ops->get_gdt(vcpu, &dt);
5676         sregs->gdt.limit = dt.size;
5677         sregs->gdt.base = dt.address;
5678
5679         sregs->cr0 = kvm_read_cr0(vcpu);
5680         sregs->cr2 = vcpu->arch.cr2;
5681         sregs->cr3 = kvm_read_cr3(vcpu);
5682         sregs->cr4 = kvm_read_cr4(vcpu);
5683         sregs->cr8 = kvm_get_cr8(vcpu);
5684         sregs->efer = vcpu->arch.efer;
5685         sregs->apic_base = kvm_get_apic_base(vcpu);
5686
5687         memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
5688
5689         if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
5690                 set_bit(vcpu->arch.interrupt.nr,
5691                         (unsigned long *)sregs->interrupt_bitmap);
5692
5693         return 0;
5694 }
5695
5696 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
5697                                     struct kvm_mp_state *mp_state)
5698 {
5699         mp_state->mp_state = vcpu->arch.mp_state;
5700         return 0;
5701 }
5702
5703 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
5704                                     struct kvm_mp_state *mp_state)
5705 {
5706         vcpu->arch.mp_state = mp_state->mp_state;
5707         kvm_make_request(KVM_REQ_EVENT, vcpu);
5708         return 0;
5709 }
5710
5711 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
5712                     int reason, bool has_error_code, u32 error_code)
5713 {
5714         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
5715         int ret;
5716
5717         init_emulate_ctxt(vcpu);
5718
5719         ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason,
5720                                    has_error_code, error_code);
5721
5722         if (ret)
5723                 return EMULATE_FAIL;
5724
5725         memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
5726         kvm_rip_write(vcpu, ctxt->eip);
5727         kvm_set_rflags(vcpu, ctxt->eflags);
5728         kvm_make_request(KVM_REQ_EVENT, vcpu);
5729         return EMULATE_DONE;
5730 }
5731 EXPORT_SYMBOL_GPL(kvm_task_switch);
5732
5733 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
5734                                   struct kvm_sregs *sregs)
5735 {
5736         int mmu_reset_needed = 0;
5737         int pending_vec, max_bits, idx;
5738         struct desc_ptr dt;
5739
5740         dt.size = sregs->idt.limit;
5741         dt.address = sregs->idt.base;
5742         kvm_x86_ops->set_idt(vcpu, &dt);
5743         dt.size = sregs->gdt.limit;
5744         dt.address = sregs->gdt.base;
5745         kvm_x86_ops->set_gdt(vcpu, &dt);
5746
5747         vcpu->arch.cr2 = sregs->cr2;
5748         mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
5749         vcpu->arch.cr3 = sregs->cr3;
5750         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
5751
5752         kvm_set_cr8(vcpu, sregs->cr8);
5753
5754         mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
5755         kvm_x86_ops->set_efer(vcpu, sregs->efer);
5756         kvm_set_apic_base(vcpu, sregs->apic_base);
5757
5758         mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
5759         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
5760         vcpu->arch.cr0 = sregs->cr0;
5761
5762         mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
5763         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
5764         if (sregs->cr4 & X86_CR4_OSXSAVE)
5765                 kvm_update_cpuid(vcpu);
5766
5767         idx = srcu_read_lock(&vcpu->kvm->srcu);
5768         if (!is_long_mode(vcpu) && is_pae(vcpu)) {
5769                 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
5770                 mmu_reset_needed = 1;
5771         }
5772         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5773
5774         if (mmu_reset_needed)
5775                 kvm_mmu_reset_context(vcpu);
5776
5777         max_bits = (sizeof sregs->interrupt_bitmap) << 3;
5778         pending_vec = find_first_bit(
5779                 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
5780         if (pending_vec < max_bits) {
5781                 kvm_queue_interrupt(vcpu, pending_vec, false);
5782                 pr_debug("Set back pending irq %d\n", pending_vec);
5783         }
5784
5785         kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5786         kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5787         kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5788         kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5789         kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5790         kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5791
5792         kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5793         kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5794
5795         update_cr8_intercept(vcpu);
5796
5797         /* Older userspace won't unhalt the vcpu on reset. */
5798         if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
5799             sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
5800             !is_protmode(vcpu))
5801                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5802
5803         kvm_make_request(KVM_REQ_EVENT, vcpu);
5804
5805         return 0;
5806 }
5807
5808 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
5809                                         struct kvm_guest_debug *dbg)
5810 {
5811         unsigned long rflags;
5812         int i, r;
5813
5814         if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
5815                 r = -EBUSY;
5816                 if (vcpu->arch.exception.pending)
5817                         goto out;
5818                 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
5819                         kvm_queue_exception(vcpu, DB_VECTOR);
5820                 else
5821                         kvm_queue_exception(vcpu, BP_VECTOR);
5822         }
5823
5824         /*
5825          * Read rflags as long as potentially injected trace flags are still
5826          * filtered out.
5827          */
5828         rflags = kvm_get_rflags(vcpu);
5829
5830         vcpu->guest_debug = dbg->control;
5831         if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
5832                 vcpu->guest_debug = 0;
5833
5834         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
5835                 for (i = 0; i < KVM_NR_DB_REGS; ++i)
5836                         vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
5837                 vcpu->arch.switch_db_regs =
5838                         (dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
5839         } else {
5840                 for (i = 0; i < KVM_NR_DB_REGS; i++)
5841                         vcpu->arch.eff_db[i] = vcpu->arch.db[i];
5842                 vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
5843         }
5844
5845         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
5846                 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
5847                         get_segment_base(vcpu, VCPU_SREG_CS);
5848
5849         /*
5850          * Trigger an rflags update that will inject or remove the trace
5851          * flags.
5852          */
5853         kvm_set_rflags(vcpu, rflags);
5854
5855         kvm_x86_ops->set_guest_debug(vcpu, dbg);
5856
5857         r = 0;
5858
5859 out:
5860
5861         return r;
5862 }
5863
5864 /*
5865  * Translate a guest virtual address to a guest physical address.
5866  */
5867 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
5868                                     struct kvm_translation *tr)
5869 {
5870         unsigned long vaddr = tr->linear_address;
5871         gpa_t gpa;
5872         int idx;
5873
5874         idx = srcu_read_lock(&vcpu->kvm->srcu);
5875         gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
5876         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5877         tr->physical_address = gpa;
5878         tr->valid = gpa != UNMAPPED_GVA;
5879         tr->writeable = 1;
5880         tr->usermode = 0;
5881
5882         return 0;
5883 }
5884
5885 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5886 {
5887         struct i387_fxsave_struct *fxsave =
5888                         &vcpu->arch.guest_fpu.state->fxsave;
5889
5890         memcpy(fpu->fpr, fxsave->st_space, 128);
5891         fpu->fcw = fxsave->cwd;
5892         fpu->fsw = fxsave->swd;
5893         fpu->ftwx = fxsave->twd;
5894         fpu->last_opcode = fxsave->fop;
5895         fpu->last_ip = fxsave->rip;
5896         fpu->last_dp = fxsave->rdp;
5897         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
5898
5899         return 0;
5900 }
5901
5902 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5903 {
5904         struct i387_fxsave_struct *fxsave =
5905                         &vcpu->arch.guest_fpu.state->fxsave;
5906
5907         memcpy(fxsave->st_space, fpu->fpr, 128);
5908         fxsave->cwd = fpu->fcw;
5909         fxsave->swd = fpu->fsw;
5910         fxsave->twd = fpu->ftwx;
5911         fxsave->fop = fpu->last_opcode;
5912         fxsave->rip = fpu->last_ip;
5913         fxsave->rdp = fpu->last_dp;
5914         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
5915
5916         return 0;
5917 }
5918
5919 int fx_init(struct kvm_vcpu *vcpu)
5920 {
5921         int err;
5922
5923         err = fpu_alloc(&vcpu->arch.guest_fpu);
5924         if (err)
5925                 return err;
5926
5927         fpu_finit(&vcpu->arch.guest_fpu);
5928
5929         /*
5930          * Ensure guest xcr0 is valid for loading
5931          */
5932         vcpu->arch.xcr0 = XSTATE_FP;
5933
5934         vcpu->arch.cr0 |= X86_CR0_ET;
5935
5936         return 0;
5937 }
5938 EXPORT_SYMBOL_GPL(fx_init);
5939
5940 static void fx_free(struct kvm_vcpu *vcpu)
5941 {
5942         fpu_free(&vcpu->arch.guest_fpu);
5943 }
5944
5945 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
5946 {
5947         if (vcpu->guest_fpu_loaded)
5948                 return;
5949
5950         /*
5951          * Restore all possible states in the guest,
5952          * and assume host would use all available bits.
5953          * Guest xcr0 would be loaded later.
5954          */
5955         kvm_put_guest_xcr0(vcpu);
5956         vcpu->guest_fpu_loaded = 1;
5957         unlazy_fpu(current);
5958         fpu_restore_checking(&vcpu->arch.guest_fpu);
5959         trace_kvm_fpu(1);
5960 }
5961
5962 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
5963 {
5964         kvm_put_guest_xcr0(vcpu);
5965
5966         if (!vcpu->guest_fpu_loaded)
5967                 return;
5968
5969         vcpu->guest_fpu_loaded = 0;
5970         fpu_save_init(&vcpu->arch.guest_fpu);
5971         ++vcpu->stat.fpu_reload;
5972         kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu);
5973         trace_kvm_fpu(0);
5974 }
5975
5976 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
5977 {
5978         kvmclock_reset(vcpu);
5979
5980         free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
5981         fx_free(vcpu);
5982         kvm_x86_ops->vcpu_free(vcpu);
5983 }
5984
5985 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
5986                                                 unsigned int id)
5987 {
5988         if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
5989                 printk_once(KERN_WARNING
5990                 "kvm: SMP vm created on host with unstable TSC; "
5991                 "guest TSC will not be reliable\n");
5992         return kvm_x86_ops->vcpu_create(kvm, id);
5993 }
5994
5995 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
5996 {
5997         int r;
5998
5999         vcpu->arch.mtrr_state.have_fixed = 1;
6000         vcpu_load(vcpu);
6001         r = kvm_arch_vcpu_reset(vcpu);
6002         if (r == 0)
6003                 r = kvm_mmu_setup(vcpu);
6004         vcpu_put(vcpu);
6005
6006         return r;
6007 }
6008
6009 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
6010 {
6011         vcpu->arch.apf.msr_val = 0;
6012
6013         vcpu_load(vcpu);
6014         kvm_mmu_unload(vcpu);
6015         vcpu_put(vcpu);
6016
6017         fx_free(vcpu);
6018         kvm_x86_ops->vcpu_free(vcpu);
6019 }
6020
6021 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
6022 {
6023         atomic_set(&vcpu->arch.nmi_queued, 0);
6024         vcpu->arch.nmi_pending = 0;
6025         vcpu->arch.nmi_injected = false;
6026
6027         vcpu->arch.switch_db_regs = 0;
6028         memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
6029         vcpu->arch.dr6 = DR6_FIXED_1;
6030         vcpu->arch.dr7 = DR7_FIXED_1;
6031
6032         kvm_make_request(KVM_REQ_EVENT, vcpu);
6033         vcpu->arch.apf.msr_val = 0;
6034         vcpu->arch.st.msr_val = 0;
6035
6036         kvmclock_reset(vcpu);
6037
6038         kvm_clear_async_pf_completion_queue(vcpu);
6039         kvm_async_pf_hash_reset(vcpu);
6040         vcpu->arch.apf.halted = false;
6041
6042         kvm_pmu_reset(vcpu);
6043
6044         return kvm_x86_ops->vcpu_reset(vcpu);
6045 }
6046
6047 int kvm_arch_hardware_enable(void *garbage)
6048 {
6049         struct kvm *kvm;
6050         struct kvm_vcpu *vcpu;
6051         int i;
6052         int ret;
6053         u64 local_tsc;
6054         u64 max_tsc = 0;
6055         bool stable, backwards_tsc = false;
6056
6057         kvm_shared_msr_cpu_online();
6058         ret = kvm_x86_ops->hardware_enable(garbage);
6059         if (ret != 0)
6060                 return ret;
6061
6062         local_tsc = native_read_tsc();
6063         stable = !check_tsc_unstable();
6064         list_for_each_entry(kvm, &vm_list, vm_list) {
6065                 kvm_for_each_vcpu(i, vcpu, kvm) {
6066                         if (!stable && vcpu->cpu == smp_processor_id())
6067                                 set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
6068                         if (stable && vcpu->arch.last_host_tsc > local_tsc) {
6069                                 backwards_tsc = true;
6070                                 if (vcpu->arch.last_host_tsc > max_tsc)
6071                                         max_tsc = vcpu->arch.last_host_tsc;
6072                         }
6073                 }
6074         }
6075
6076         /*
6077          * Sometimes, even reliable TSCs go backwards.  This happens on
6078          * platforms that reset TSC during suspend or hibernate actions, but
6079          * maintain synchronization.  We must compensate.  Fortunately, we can
6080          * detect that condition here, which happens early in CPU bringup,
6081          * before any KVM threads can be running.  Unfortunately, we can't
6082          * bring the TSCs fully up to date with real time, as we aren't yet far
6083          * enough into CPU bringup that we know how much real time has actually
6084          * elapsed; our helper function, get_kernel_ns() will be using boot
6085          * variables that haven't been updated yet.
6086          *
6087          * So we simply find the maximum observed TSC above, then record the
6088          * adjustment to TSC in each VCPU.  When the VCPU later gets loaded,
6089          * the adjustment will be applied.  Note that we accumulate
6090          * adjustments, in case multiple suspend cycles happen before some VCPU
6091          * gets a chance to run again.  In the event that no KVM threads get a
6092          * chance to run, we will miss the entire elapsed period, as we'll have
6093          * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
6094          * loose cycle time.  This isn't too big a deal, since the loss will be
6095          * uniform across all VCPUs (not to mention the scenario is extremely
6096          * unlikely). It is possible that a second hibernate recovery happens
6097          * much faster than a first, causing the observed TSC here to be
6098          * smaller; this would require additional padding adjustment, which is
6099          * why we set last_host_tsc to the local tsc observed here.
6100          *
6101          * N.B. - this code below runs only on platforms with reliable TSC,
6102          * as that is the only way backwards_tsc is set above.  Also note
6103          * that this runs for ALL vcpus, which is not a bug; all VCPUs should
6104          * have the same delta_cyc adjustment applied if backwards_tsc
6105          * is detected.  Note further, this adjustment is only done once,
6106          * as we reset last_host_tsc on all VCPUs to stop this from being
6107          * called multiple times (one for each physical CPU bringup).
6108          *
6109          * Platforms with unnreliable TSCs don't have to deal with this, they
6110          * will be compensated by the logic in vcpu_load, which sets the TSC to
6111          * catchup mode.  This will catchup all VCPUs to real time, but cannot
6112          * guarantee that they stay in perfect synchronization.
6113          */
6114         if (backwards_tsc) {
6115                 u64 delta_cyc = max_tsc - local_tsc;
6116                 list_for_each_entry(kvm, &vm_list, vm_list) {
6117                         kvm_for_each_vcpu(i, vcpu, kvm) {
6118                                 vcpu->arch.tsc_offset_adjustment += delta_cyc;
6119                                 vcpu->arch.last_host_tsc = local_tsc;
6120                         }
6121
6122                         /*
6123                          * We have to disable TSC offset matching.. if you were
6124                          * booting a VM while issuing an S4 host suspend....
6125                          * you may have some problem.  Solving this issue is
6126                          * left as an exercise to the reader.
6127                          */
6128                         kvm->arch.last_tsc_nsec = 0;
6129                         kvm->arch.last_tsc_write = 0;
6130                 }
6131
6132         }
6133         return 0;
6134 }
6135
6136 void kvm_arch_hardware_disable(void *garbage)
6137 {
6138         kvm_x86_ops->hardware_disable(garbage);
6139         drop_user_return_notifiers(garbage);
6140 }
6141
6142 int kvm_arch_hardware_setup(void)
6143 {
6144         return kvm_x86_ops->hardware_setup();
6145 }
6146
6147 void kvm_arch_hardware_unsetup(void)
6148 {
6149         kvm_x86_ops->hardware_unsetup();
6150 }
6151
6152 void kvm_arch_check_processor_compat(void *rtn)
6153 {
6154         kvm_x86_ops->check_processor_compatibility(rtn);
6155 }
6156
6157 bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)
6158 {
6159         return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL);
6160 }
6161
6162 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
6163 {
6164         struct page *page;
6165         struct kvm *kvm;
6166         int r;
6167
6168         BUG_ON(vcpu->kvm == NULL);
6169         kvm = vcpu->kvm;
6170
6171         vcpu->arch.emulate_ctxt.ops = &emulate_ops;
6172         if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
6173                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
6174         else
6175                 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
6176
6177         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
6178         if (!page) {
6179                 r = -ENOMEM;
6180                 goto fail;
6181         }
6182         vcpu->arch.pio_data = page_address(page);
6183
6184         kvm_set_tsc_khz(vcpu, max_tsc_khz);
6185
6186         r = kvm_mmu_create(vcpu);
6187         if (r < 0)
6188                 goto fail_free_pio_data;
6189
6190         if (irqchip_in_kernel(kvm)) {
6191                 r = kvm_create_lapic(vcpu);
6192                 if (r < 0)
6193                         goto fail_mmu_destroy;
6194         }
6195
6196         vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
6197                                        GFP_KERNEL);
6198         if (!vcpu->arch.mce_banks) {
6199                 r = -ENOMEM;
6200                 goto fail_free_lapic;
6201         }
6202         vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
6203
6204         if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL))
6205                 goto fail_free_mce_banks;
6206
6207         kvm_async_pf_hash_reset(vcpu);
6208         kvm_pmu_init(vcpu);
6209
6210         return 0;
6211 fail_free_mce_banks:
6212         kfree(vcpu->arch.mce_banks);
6213 fail_free_lapic:
6214         kvm_free_lapic(vcpu);
6215 fail_mmu_destroy:
6216         kvm_mmu_destroy(vcpu);
6217 fail_free_pio_data:
6218         free_page((unsigned long)vcpu->arch.pio_data);
6219 fail:
6220         return r;
6221 }
6222
6223 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
6224 {
6225         int idx;
6226
6227         kvm_pmu_destroy(vcpu);
6228         kfree(vcpu->arch.mce_banks);
6229         kvm_free_lapic(vcpu);
6230         idx = srcu_read_lock(&vcpu->kvm->srcu);
6231         kvm_mmu_destroy(vcpu);
6232         srcu_read_unlock(&vcpu->kvm->srcu, idx);
6233         free_page((unsigned long)vcpu->arch.pio_data);
6234 }
6235
6236 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
6237 {
6238         if (type)
6239                 return -EINVAL;
6240
6241         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
6242         INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
6243
6244         /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
6245         set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
6246
6247         raw_spin_lock_init(&kvm->arch.tsc_write_lock);
6248
6249         return 0;
6250 }
6251
6252 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
6253 {
6254         vcpu_load(vcpu);
6255         kvm_mmu_unload(vcpu);
6256         vcpu_put(vcpu);
6257 }
6258
6259 static void kvm_free_vcpus(struct kvm *kvm)
6260 {
6261         unsigned int i;
6262         struct kvm_vcpu *vcpu;
6263
6264         /*
6265          * Unpin any mmu pages first.
6266          */
6267         kvm_for_each_vcpu(i, vcpu, kvm) {
6268                 kvm_clear_async_pf_completion_queue(vcpu);
6269                 kvm_unload_vcpu_mmu(vcpu);
6270         }
6271         kvm_for_each_vcpu(i, vcpu, kvm)
6272                 kvm_arch_vcpu_free(vcpu);
6273
6274         mutex_lock(&kvm->lock);
6275         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
6276                 kvm->vcpus[i] = NULL;
6277
6278         atomic_set(&kvm->online_vcpus, 0);
6279         mutex_unlock(&kvm->lock);
6280 }
6281
6282 void kvm_arch_sync_events(struct kvm *kvm)
6283 {
6284         kvm_free_all_assigned_devices(kvm);
6285         kvm_free_pit(kvm);
6286 }
6287
6288 void kvm_arch_destroy_vm(struct kvm *kvm)
6289 {
6290         kvm_iommu_unmap_guest(kvm);
6291         kfree(kvm->arch.vpic);
6292         kfree(kvm->arch.vioapic);
6293         kvm_free_vcpus(kvm);
6294         if (kvm->arch.apic_access_page)
6295                 put_page(kvm->arch.apic_access_page);
6296         if (kvm->arch.ept_identity_pagetable)
6297                 put_page(kvm->arch.ept_identity_pagetable);
6298 }
6299
6300 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
6301                            struct kvm_memory_slot *dont)
6302 {
6303         int i;
6304
6305         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
6306                 if (!dont || free->arch.lpage_info[i] != dont->arch.lpage_info[i]) {
6307                         vfree(free->arch.lpage_info[i]);
6308                         free->arch.lpage_info[i] = NULL;
6309                 }
6310         }
6311 }
6312
6313 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
6314 {
6315         int i;
6316
6317         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
6318                 unsigned long ugfn;
6319                 int lpages;
6320                 int level = i + 2;
6321
6322                 lpages = gfn_to_index(slot->base_gfn + npages - 1,
6323                                       slot->base_gfn, level) + 1;
6324
6325                 slot->arch.lpage_info[i] =
6326                         vzalloc(lpages * sizeof(*slot->arch.lpage_info[i]));
6327                 if (!slot->arch.lpage_info[i])
6328                         goto out_free;
6329
6330                 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
6331                         slot->arch.lpage_info[i][0].write_count = 1;
6332                 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
6333                         slot->arch.lpage_info[i][lpages - 1].write_count = 1;
6334                 ugfn = slot->userspace_addr >> PAGE_SHIFT;
6335                 /*
6336                  * If the gfn and userspace address are not aligned wrt each
6337                  * other, or if explicitly asked to, disable large page
6338                  * support for this slot
6339                  */
6340                 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
6341                     !kvm_largepages_enabled()) {
6342                         unsigned long j;
6343
6344                         for (j = 0; j < lpages; ++j)
6345                                 slot->arch.lpage_info[i][j].write_count = 1;
6346                 }
6347         }
6348
6349         return 0;
6350
6351 out_free:
6352         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
6353                 vfree(slot->arch.lpage_info[i]);
6354                 slot->arch.lpage_info[i] = NULL;
6355         }
6356         return -ENOMEM;
6357 }
6358
6359 int kvm_arch_prepare_memory_region(struct kvm *kvm,
6360                                 struct kvm_memory_slot *memslot,
6361                                 struct kvm_memory_slot old,
6362                                 struct kvm_userspace_memory_region *mem,
6363                                 int user_alloc)
6364 {
6365         int npages = memslot->npages;
6366         int map_flags = MAP_PRIVATE | MAP_ANONYMOUS;
6367
6368         /* Prevent internal slot pages from being moved by fork()/COW. */
6369         if (memslot->id >= KVM_MEMORY_SLOTS)
6370                 map_flags = MAP_SHARED | MAP_ANONYMOUS;
6371
6372         /*To keep backward compatibility with older userspace,
6373          *x86 needs to hanlde !user_alloc case.
6374          */
6375         if (!user_alloc) {
6376                 if (npages && !old.rmap) {
6377                         unsigned long userspace_addr;
6378
6379                         userspace_addr = vm_mmap(NULL, 0,
6380                                                  npages * PAGE_SIZE,
6381                                                  PROT_READ | PROT_WRITE,
6382                                                  map_flags,
6383                                                  0);
6384
6385                         if (IS_ERR((void *)userspace_addr))
6386                                 return PTR_ERR((void *)userspace_addr);
6387
6388                         memslot->userspace_addr = userspace_addr;
6389                 }
6390         }
6391
6392
6393         return 0;
6394 }
6395
6396 void kvm_arch_commit_memory_region(struct kvm *kvm,
6397                                 struct kvm_userspace_memory_region *mem,
6398                                 struct kvm_memory_slot old,
6399                                 int user_alloc)
6400 {
6401
6402         int nr_mmu_pages = 0, npages = mem->memory_size >> PAGE_SHIFT;
6403
6404         if (!user_alloc && !old.user_alloc && old.rmap && !npages) {
6405                 int ret;
6406
6407                 ret = vm_munmap(old.userspace_addr,
6408                                 old.npages * PAGE_SIZE);
6409                 if (ret < 0)
6410                         printk(KERN_WARNING
6411                                "kvm_vm_ioctl_set_memory_region: "
6412                                "failed to munmap memory\n");
6413         }
6414
6415         if (!kvm->arch.n_requested_mmu_pages)
6416                 nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
6417
6418         spin_lock(&kvm->mmu_lock);
6419         if (nr_mmu_pages)
6420                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
6421         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
6422         spin_unlock(&kvm->mmu_lock);
6423 }
6424
6425 void kvm_arch_flush_shadow(struct kvm *kvm)
6426 {
6427         kvm_mmu_zap_all(kvm);
6428         kvm_reload_remote_mmus(kvm);
6429 }
6430
6431 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
6432 {
6433         return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
6434                 !vcpu->arch.apf.halted)
6435                 || !list_empty_careful(&vcpu->async_pf.done)
6436                 || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
6437                 || atomic_read(&vcpu->arch.nmi_queued) ||
6438                 (kvm_arch_interrupt_allowed(vcpu) &&
6439                  kvm_cpu_has_interrupt(vcpu));
6440 }
6441
6442 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
6443 {
6444         return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
6445 }
6446
6447 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
6448 {
6449         return kvm_x86_ops->interrupt_allowed(vcpu);
6450 }
6451
6452 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
6453 {
6454         unsigned long current_rip = kvm_rip_read(vcpu) +
6455                 get_segment_base(vcpu, VCPU_SREG_CS);
6456
6457         return current_rip == linear_rip;
6458 }
6459 EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
6460
6461 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
6462 {
6463         unsigned long rflags;
6464
6465         rflags = kvm_x86_ops->get_rflags(vcpu);
6466         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
6467                 rflags &= ~X86_EFLAGS_TF;
6468         return rflags;
6469 }
6470 EXPORT_SYMBOL_GPL(kvm_get_rflags);
6471
6472 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
6473 {
6474         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
6475             kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
6476                 rflags |= X86_EFLAGS_TF;
6477         kvm_x86_ops->set_rflags(vcpu, rflags);
6478         kvm_make_request(KVM_REQ_EVENT, vcpu);
6479 }
6480 EXPORT_SYMBOL_GPL(kvm_set_rflags);
6481
6482 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
6483 {
6484         int r;
6485
6486         if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) ||
6487               is_error_page(work->page))
6488                 return;
6489
6490         r = kvm_mmu_reload(vcpu);
6491         if (unlikely(r))
6492                 return;
6493
6494         if (!vcpu->arch.mmu.direct_map &&
6495               work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu))
6496                 return;
6497
6498         vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
6499 }
6500
6501 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
6502 {
6503         return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
6504 }
6505
6506 static inline u32 kvm_async_pf_next_probe(u32 key)
6507 {
6508         return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1);
6509 }
6510
6511 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6512 {
6513         u32 key = kvm_async_pf_hash_fn(gfn);
6514
6515         while (vcpu->arch.apf.gfns[key] != ~0)
6516                 key = kvm_async_pf_next_probe(key);
6517
6518         vcpu->arch.apf.gfns[key] = gfn;
6519 }
6520
6521 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
6522 {
6523         int i;
6524         u32 key = kvm_async_pf_hash_fn(gfn);
6525
6526         for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) &&
6527                      (vcpu->arch.apf.gfns[key] != gfn &&
6528                       vcpu->arch.apf.gfns[key] != ~0); i++)
6529                 key = kvm_async_pf_next_probe(key);
6530
6531         return key;
6532 }
6533
6534 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6535 {
6536         return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
6537 }
6538
6539 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6540 {
6541         u32 i, j, k;
6542
6543         i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
6544         while (true) {
6545                 vcpu->arch.apf.gfns[i] = ~0;
6546                 do {
6547                         j = kvm_async_pf_next_probe(j);
6548                         if (vcpu->arch.apf.gfns[j] == ~0)
6549                                 return;
6550                         k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
6551                         /*
6552                          * k lies cyclically in ]i,j]
6553                          * |    i.k.j |
6554                          * |....j i.k.| or  |.k..j i...|
6555                          */
6556                 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
6557                 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
6558                 i = j;
6559         }
6560 }
6561
6562 static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
6563 {
6564
6565         return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
6566                                       sizeof(val));
6567 }
6568
6569 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
6570                                      struct kvm_async_pf *work)
6571 {
6572         struct x86_exception fault;
6573
6574         trace_kvm_async_pf_not_present(work->arch.token, work->gva);
6575         kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
6576
6577         if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
6578             (vcpu->arch.apf.send_user_only &&
6579              kvm_x86_ops->get_cpl(vcpu) == 0))
6580                 kvm_make_request(KVM_REQ_APF_HALT, vcpu);
6581         else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
6582                 fault.vector = PF_VECTOR;
6583                 fault.error_code_valid = true;
6584                 fault.error_code = 0;
6585                 fault.nested_page_fault = false;
6586                 fault.address = work->arch.token;
6587                 kvm_inject_page_fault(vcpu, &fault);
6588         }
6589 }
6590
6591 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
6592                                  struct kvm_async_pf *work)
6593 {
6594         struct x86_exception fault;
6595
6596         trace_kvm_async_pf_ready(work->arch.token, work->gva);
6597         if (is_error_page(work->page))
6598                 work->arch.token = ~0; /* broadcast wakeup */
6599         else
6600                 kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
6601
6602         if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) &&
6603             !apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) {
6604                 fault.vector = PF_VECTOR;
6605                 fault.error_code_valid = true;
6606                 fault.error_code = 0;
6607                 fault.nested_page_fault = false;
6608                 fault.address = work->arch.token;
6609                 kvm_inject_page_fault(vcpu, &fault);
6610         }
6611         vcpu->arch.apf.halted = false;
6612         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
6613 }
6614
6615 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
6616 {
6617         if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED))
6618                 return true;
6619         else
6620                 return !kvm_event_needs_reinjection(vcpu) &&
6621                         kvm_x86_ops->interrupt_allowed(vcpu);
6622 }
6623
6624 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
6625 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
6626 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
6627 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
6628 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
6629 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
6630 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
6631 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
6632 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
6633 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
6634 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
6635 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);