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

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2007
  16  * Copyright 2010-2011 Freescale Semiconductor, Inc.
  17  *
  18  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  19  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  20  */
  21
  22 #include <linux/errno.h>
  23 #include <linux/err.h>
  24 #include <linux/kvm_host.h>
  25 #include <linux/gfp.h>
  26 #include <linux/module.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/fs.h>
  29
  30 #include <asm/cputable.h>
  31 #include <asm/uaccess.h>
  32 #include <asm/kvm_ppc.h>
  33 #include "timing.h"
  34 #include <asm/cacheflush.h>
  35
  36 #include "booke.h"
  37
  38 unsigned long kvmppc_booke_handlers;
  39
  40 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  41 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  42
  43 struct kvm_stats_debugfs_item debugfs_entries[] = {
  44         { "mmio",       VCPU_STAT(mmio_exits) },
  45         { "dcr",        VCPU_STAT(dcr_exits) },
  46         { "sig",        VCPU_STAT(signal_exits) },
  47         { "itlb_r",     VCPU_STAT(itlb_real_miss_exits) },
  48         { "itlb_v",     VCPU_STAT(itlb_virt_miss_exits) },
  49         { "dtlb_r",     VCPU_STAT(dtlb_real_miss_exits) },
  50         { "dtlb_v",     VCPU_STAT(dtlb_virt_miss_exits) },
  51         { "sysc",       VCPU_STAT(syscall_exits) },
  52         { "isi",        VCPU_STAT(isi_exits) },
  53         { "dsi",        VCPU_STAT(dsi_exits) },
  54         { "inst_emu",   VCPU_STAT(emulated_inst_exits) },
  55         { "dec",        VCPU_STAT(dec_exits) },
  56         { "ext_intr",   VCPU_STAT(ext_intr_exits) },
  57         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  58         { NULL }
  59 };
  60
  61 /* TODO: use vcpu_printf() */
  62 void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
  63 {
  64         int i;
  65
  66         printk("pc:   %08lx msr:  %08llx\n", vcpu->arch.pc, vcpu->arch.shared->msr);
  67         printk("lr:   %08lx ctr:  %08lx\n", vcpu->arch.lr, vcpu->arch.ctr);
  68         printk("srr0: %08llx srr1: %08llx\n", vcpu->arch.shared->srr0,
  69                                             vcpu->arch.shared->srr1);
  70
  71         printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
  72
  73         for (i = 0; i < 32; i += 4) {
  74                 printk("gpr%02d: %08lx %08lx %08lx %08lx\n", i,
  75                        kvmppc_get_gpr(vcpu, i),
  76                        kvmppc_get_gpr(vcpu, i+1),
  77                        kvmppc_get_gpr(vcpu, i+2),
  78                        kvmppc_get_gpr(vcpu, i+3));
  79         }
  80 }
  81
  82 #ifdef CONFIG_SPE
  83 void kvmppc_vcpu_disable_spe(struct kvm_vcpu *vcpu)
  84 {
  85         preempt_disable();
  86         enable_kernel_spe();
  87         kvmppc_save_guest_spe(vcpu);
  88         vcpu->arch.shadow_msr &= ~MSR_SPE;
  89         preempt_enable();
  90 }
  91
  92 static void kvmppc_vcpu_enable_spe(struct kvm_vcpu *vcpu)
  93 {
  94         preempt_disable();
  95         enable_kernel_spe();
  96         kvmppc_load_guest_spe(vcpu);
  97         vcpu->arch.shadow_msr |= MSR_SPE;
  98         preempt_enable();
  99 }
 100
 101 static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
 102 {
 103         if (vcpu->arch.shared->msr & MSR_SPE) {
 104                 if (!(vcpu->arch.shadow_msr & MSR_SPE))
 105                         kvmppc_vcpu_enable_spe(vcpu);
 106         } else if (vcpu->arch.shadow_msr & MSR_SPE) {
 107                 kvmppc_vcpu_disable_spe(vcpu);
 108         }
 109 }
 110 #else
 111 static void kvmppc_vcpu_sync_spe(struct kvm_vcpu *vcpu)
 112 {
 113 }
 114 #endif
 115
 116 /*
 117  * Helper function for "full" MSR writes.  No need to call this if only
 118  * EE/CE/ME/DE/RI are changing.
 119  */
 120 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
 121 {
 122         u32 old_msr = vcpu->arch.shared->msr;
 123
 124         vcpu->arch.shared->msr = new_msr;
 125
 126         kvmppc_mmu_msr_notify(vcpu, old_msr);
 127
 128         if (vcpu->arch.shared->msr & MSR_WE) {
 129                 kvm_vcpu_block(vcpu);
 130                 kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
 131         };
 132
 133         kvmppc_vcpu_sync_spe(vcpu);
 134 }
 135
 136 static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu,
 137                                        unsigned int priority)
 138 {
 139         set_bit(priority, &vcpu->arch.pending_exceptions);
 140 }
 141
 142 static void kvmppc_core_queue_dtlb_miss(struct kvm_vcpu *vcpu,
 143                                         ulong dear_flags, ulong esr_flags)
 144 {
 145         vcpu->arch.queued_dear = dear_flags;
 146         vcpu->arch.queued_esr = esr_flags;
 147         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS);
 148 }
 149
 150 static void kvmppc_core_queue_data_storage(struct kvm_vcpu *vcpu,
 151                                            ulong dear_flags, ulong esr_flags)
 152 {
 153         vcpu->arch.queued_dear = dear_flags;
 154         vcpu->arch.queued_esr = esr_flags;
 155         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE);
 156 }
 157
 158 static void kvmppc_core_queue_inst_storage(struct kvm_vcpu *vcpu,
 159                                            ulong esr_flags)
 160 {
 161         vcpu->arch.queued_esr = esr_flags;
 162         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE);
 163 }
 164
 165 void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong esr_flags)
 166 {
 167         vcpu->arch.queued_esr = esr_flags;
 168         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
 169 }
 170
 171 void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
 172 {
 173         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DECREMENTER);
 174 }
 175
 176 int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
 177 {
 178         return test_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
 179 }
 180
 181 void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
 182 {
 183         clear_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
 184 }
 185
 186 void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
 187                                 struct kvm_interrupt *irq)
 188 {
 189         unsigned int prio = BOOKE_IRQPRIO_EXTERNAL;
 190
 191         if (irq->irq == KVM_INTERRUPT_SET_LEVEL)
 192                 prio = BOOKE_IRQPRIO_EXTERNAL_LEVEL;
 193
 194         kvmppc_booke_queue_irqprio(vcpu, prio);
 195 }
 196
 197 void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu,
 198                                   struct kvm_interrupt *irq)
 199 {
 200         clear_bit(BOOKE_IRQPRIO_EXTERNAL, &vcpu->arch.pending_exceptions);
 201         clear_bit(BOOKE_IRQPRIO_EXTERNAL_LEVEL, &vcpu->arch.pending_exceptions);
 202 }
 203
 204 /* Deliver the interrupt of the corresponding priority, if possible. */
 205 static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
 206                                         unsigned int priority)
 207 {
 208         int allowed = 0;
 209         ulong uninitialized_var(msr_mask);
 210         bool update_esr = false, update_dear = false;
 211         ulong crit_raw = vcpu->arch.shared->critical;
 212         ulong crit_r1 = kvmppc_get_gpr(vcpu, 1);
 213         bool crit;
 214         bool keep_irq = false;
 215
 216         /* Truncate crit indicators in 32 bit mode */
 217         if (!(vcpu->arch.shared->msr & MSR_SF)) {
 218                 crit_raw &= 0xffffffff;
 219                 crit_r1 &= 0xffffffff;
 220         }
 221
 222         /* Critical section when crit == r1 */
 223         crit = (crit_raw == crit_r1);
 224         /* ... and we're in supervisor mode */
 225         crit = crit && !(vcpu->arch.shared->msr & MSR_PR);
 226
 227         if (priority == BOOKE_IRQPRIO_EXTERNAL_LEVEL) {
 228                 priority = BOOKE_IRQPRIO_EXTERNAL;
 229                 keep_irq = true;
 230         }
 231
 232         switch (priority) {
 233         case BOOKE_IRQPRIO_DTLB_MISS:
 234         case BOOKE_IRQPRIO_DATA_STORAGE:
 235                 update_dear = true;
 236                 /* fall through */
 237         case BOOKE_IRQPRIO_INST_STORAGE:
 238         case BOOKE_IRQPRIO_PROGRAM:
 239                 update_esr = true;
 240                 /* fall through */
 241         case BOOKE_IRQPRIO_ITLB_MISS:
 242         case BOOKE_IRQPRIO_SYSCALL:
 243         case BOOKE_IRQPRIO_FP_UNAVAIL:
 244         case BOOKE_IRQPRIO_SPE_UNAVAIL:
 245         case BOOKE_IRQPRIO_SPE_FP_DATA:
 246         case BOOKE_IRQPRIO_SPE_FP_ROUND:
 247         case BOOKE_IRQPRIO_AP_UNAVAIL:
 248         case BOOKE_IRQPRIO_ALIGNMENT:
 249                 allowed = 1;
 250                 msr_mask = MSR_CE|MSR_ME|MSR_DE;
 251                 break;
 252         case BOOKE_IRQPRIO_CRITICAL:
 253         case BOOKE_IRQPRIO_WATCHDOG:
 254                 allowed = vcpu->arch.shared->msr & MSR_CE;
 255                 msr_mask = MSR_ME;
 256                 break;
 257         case BOOKE_IRQPRIO_MACHINE_CHECK:
 258                 allowed = vcpu->arch.shared->msr & MSR_ME;
 259                 msr_mask = 0;
 260                 break;
 261         case BOOKE_IRQPRIO_EXTERNAL:
 262         case BOOKE_IRQPRIO_DECREMENTER:
 263         case BOOKE_IRQPRIO_FIT:
 264                 allowed = vcpu->arch.shared->msr & MSR_EE;
 265                 allowed = allowed && !crit;
 266                 msr_mask = MSR_CE|MSR_ME|MSR_DE;
 267                 break;
 268         case BOOKE_IRQPRIO_DEBUG:
 269                 allowed = vcpu->arch.shared->msr & MSR_DE;
 270                 msr_mask = MSR_ME;
 271                 break;
 272         }
 273
 274         if (allowed) {
 275                 vcpu->arch.shared->srr0 = vcpu->arch.pc;
 276                 vcpu->arch.shared->srr1 = vcpu->arch.shared->msr;
 277                 vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[priority];
 278                 if (update_esr == true)
 279                         vcpu->arch.esr = vcpu->arch.queued_esr;
 280                 if (update_dear == true)
 281                         vcpu->arch.shared->dar = vcpu->arch.queued_dear;
 282                 kvmppc_set_msr(vcpu, vcpu->arch.shared->msr & msr_mask);
 283
 284                 if (!keep_irq)
 285                         clear_bit(priority, &vcpu->arch.pending_exceptions);
 286         }
 287
 288         return allowed;
 289 }
 290
 291 /* Check pending exceptions and deliver one, if possible. */
 292 void kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
 293 {
 294         unsigned long *pending = &vcpu->arch.pending_exceptions;
 295         unsigned long old_pending = vcpu->arch.pending_exceptions;
 296         unsigned int priority;
 297
 298         WARN_ON_ONCE(!irqs_disabled());
 299
 300         priority = __ffs(*pending);
 301         while (priority <= BOOKE_IRQPRIO_MAX) {
 302                 if (kvmppc_booke_irqprio_deliver(vcpu, priority))
 303                         break;
 304
 305                 priority = find_next_bit(pending,
 306                                          BITS_PER_BYTE * sizeof(*pending),
 307                                          priority + 1);
 308         }
 309
 310         /* Tell the guest about our interrupt status */
 311         if (*pending)
 312                 vcpu->arch.shared->int_pending = 1;
 313         else if (old_pending)
 314                 vcpu->arch.shared->int_pending = 0;
 315 }
 316
 317 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 318 {
 319         int ret;
 320
 321         if (!vcpu->arch.sane) {
 322                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
 323                 return -EINVAL;
 324         }
 325
 326         local_irq_disable();
 327
 328         kvmppc_core_prepare_to_enter(vcpu);
 329
 330         if (signal_pending(current)) {
 331                 kvm_run->exit_reason = KVM_EXIT_INTR;
 332                 ret = -EINTR;
 333                 goto out;
 334         }
 335
 336         kvm_guest_enter();
 337         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
 338         kvm_guest_exit();
 339
 340 out:
 341         local_irq_enable();
 342         return ret;
 343 }
 344
 345 /**
 346  * kvmppc_handle_exit
 347  *
 348  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
 349  */
 350 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 351                        unsigned int exit_nr)
 352 {
 353         enum emulation_result er;
 354         int r = RESUME_HOST;
 355
 356         /* update before a new last_exit_type is rewritten */
 357         kvmppc_update_timing_stats(vcpu);
 358
 359         local_irq_enable();
 360
 361         run->exit_reason = KVM_EXIT_UNKNOWN;
 362         run->ready_for_interrupt_injection = 1;
 363
 364         switch (exit_nr) {
 365         case BOOKE_INTERRUPT_MACHINE_CHECK:
 366                 printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
 367                 kvmppc_dump_vcpu(vcpu);
 368                 r = RESUME_HOST;
 369                 break;
 370
 371         case BOOKE_INTERRUPT_EXTERNAL:
 372                 kvmppc_account_exit(vcpu, EXT_INTR_EXITS);
 373                 if (need_resched())
 374                         cond_resched();
 375                 r = RESUME_GUEST;
 376                 break;
 377
 378         case BOOKE_INTERRUPT_DECREMENTER:
 379                 /* Since we switched IVPR back to the host's value, the host
 380                  * handled this interrupt the moment we enabled interrupts.
 381                  * Now we just offer it a chance to reschedule the guest. */
 382                 kvmppc_account_exit(vcpu, DEC_EXITS);
 383                 if (need_resched())
 384                         cond_resched();
 385                 r = RESUME_GUEST;
 386                 break;
 387
 388         case BOOKE_INTERRUPT_PROGRAM:
 389                 if (vcpu->arch.shared->msr & MSR_PR) {
 390                         /* Program traps generated by user-level software must be handled
 391                          * by the guest kernel. */
 392                         kvmppc_core_queue_program(vcpu, vcpu->arch.fault_esr);
 393                         r = RESUME_GUEST;
 394                         kvmppc_account_exit(vcpu, USR_PR_INST);
 395                         break;
 396                 }
 397
 398                 er = kvmppc_emulate_instruction(run, vcpu);
 399                 switch (er) {
 400                 case EMULATE_DONE:
 401                         /* don't overwrite subtypes, just account kvm_stats */
 402                         kvmppc_account_exit_stat(vcpu, EMULATED_INST_EXITS);
 403                         /* Future optimization: only reload non-volatiles if
 404                          * they were actually modified by emulation. */
 405                         r = RESUME_GUEST_NV;
 406                         break;
 407                 case EMULATE_DO_DCR:
 408                         run->exit_reason = KVM_EXIT_DCR;
 409                         r = RESUME_HOST;
 410                         break;
 411                 case EMULATE_FAIL:
 412                         /* XXX Deliver Program interrupt to guest. */
 413                         printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
 414                                __func__, vcpu->arch.pc, vcpu->arch.last_inst);
 415                         /* For debugging, encode the failing instruction and
 416                          * report it to userspace. */
 417                         run->hw.hardware_exit_reason = ~0ULL << 32;
 418                         run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
 419                         r = RESUME_HOST;
 420                         break;
 421                 default:
 422                         BUG();
 423                 }
 424                 break;
 425
 426         case BOOKE_INTERRUPT_FP_UNAVAIL:
 427                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL);
 428                 kvmppc_account_exit(vcpu, FP_UNAVAIL);
 429                 r = RESUME_GUEST;
 430                 break;
 431
 432 #ifdef CONFIG_SPE
 433         case BOOKE_INTERRUPT_SPE_UNAVAIL: {
 434                 if (vcpu->arch.shared->msr & MSR_SPE)
 435                         kvmppc_vcpu_enable_spe(vcpu);
 436                 else
 437                         kvmppc_booke_queue_irqprio(vcpu,
 438                                                    BOOKE_IRQPRIO_SPE_UNAVAIL);
 439                 r = RESUME_GUEST;
 440                 break;
 441         }
 442
 443         case BOOKE_INTERRUPT_SPE_FP_DATA:
 444                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_DATA);
 445                 r = RESUME_GUEST;
 446                 break;
 447
 448         case BOOKE_INTERRUPT_SPE_FP_ROUND:
 449                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_ROUND);
 450                 r = RESUME_GUEST;
 451                 break;
 452 #else
 453         case BOOKE_INTERRUPT_SPE_UNAVAIL:
 454                 /*
 455                  * Guest wants SPE, but host kernel doesn't support it.  Send
 456                  * an "unimplemented operation" program check to the guest.
 457                  */
 458                 kvmppc_core_queue_program(vcpu, ESR_PUO | ESR_SPV);
 459                 r = RESUME_GUEST;
 460                 break;
 461
 462         /*
 463          * These really should never happen without CONFIG_SPE,
 464          * as we should never enable the real MSR[SPE] in the guest.
 465          */
 466         case BOOKE_INTERRUPT_SPE_FP_DATA:
 467         case BOOKE_INTERRUPT_SPE_FP_ROUND:
 468                 printk(KERN_CRIT "%s: unexpected SPE interrupt %u at %08lx\n",
 469                        __func__, exit_nr, vcpu->arch.pc);
 470                 run->hw.hardware_exit_reason = exit_nr;
 471                 r = RESUME_HOST;
 472                 break;
 473 #endif
 474
 475         case BOOKE_INTERRUPT_DATA_STORAGE:
 476                 kvmppc_core_queue_data_storage(vcpu, vcpu->arch.fault_dear,
 477                                                vcpu->arch.fault_esr);
 478                 kvmppc_account_exit(vcpu, DSI_EXITS);
 479                 r = RESUME_GUEST;
 480                 break;
 481
 482         case BOOKE_INTERRUPT_INST_STORAGE:
 483                 kvmppc_core_queue_inst_storage(vcpu, vcpu->arch.fault_esr);
 484                 kvmppc_account_exit(vcpu, ISI_EXITS);
 485                 r = RESUME_GUEST;
 486                 break;
 487
 488         case BOOKE_INTERRUPT_SYSCALL:
 489                 if (!(vcpu->arch.shared->msr & MSR_PR) &&
 490                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
 491                         /* KVM PV hypercalls */
 492                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
 493                         r = RESUME_GUEST;
 494                 } else {
 495                         /* Guest syscalls */
 496                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL);
 497                 }
 498                 kvmppc_account_exit(vcpu, SYSCALL_EXITS);
 499                 r = RESUME_GUEST;
 500                 break;
 501
 502         case BOOKE_INTERRUPT_DTLB_MISS: {
 503                 unsigned long eaddr = vcpu->arch.fault_dear;
 504                 int gtlb_index;
 505                 gpa_t gpaddr;
 506                 gfn_t gfn;
 507
 508 #ifdef CONFIG_KVM_E500
 509                 if (!(vcpu->arch.shared->msr & MSR_PR) &&
 510                     (eaddr & PAGE_MASK) == vcpu->arch.magic_page_ea) {
 511                         kvmppc_map_magic(vcpu);
 512                         kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
 513                         r = RESUME_GUEST;
 514
 515                         break;
 516                 }
 517 #endif
 518
 519                 /* Check the guest TLB. */
 520                 gtlb_index = kvmppc_mmu_dtlb_index(vcpu, eaddr);
 521                 if (gtlb_index < 0) {
 522                         /* The guest didn't have a mapping for it. */
 523                         kvmppc_core_queue_dtlb_miss(vcpu,
 524                                                     vcpu->arch.fault_dear,
 525                                                     vcpu->arch.fault_esr);
 526                         kvmppc_mmu_dtlb_miss(vcpu);
 527                         kvmppc_account_exit(vcpu, DTLB_REAL_MISS_EXITS);
 528                         r = RESUME_GUEST;
 529                         break;
 530                 }
 531
 532                 gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
 533                 gfn = gpaddr >> PAGE_SHIFT;
 534
 535                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 536                         /* The guest TLB had a mapping, but the shadow TLB
 537                          * didn't, and it is RAM. This could be because:
 538                          * a) the entry is mapping the host kernel, or
 539                          * b) the guest used a large mapping which we're faking
 540                          * Either way, we need to satisfy the fault without
 541                          * invoking the guest. */
 542                         kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
 543                         kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
 544                         r = RESUME_GUEST;
 545                 } else {
 546                         /* Guest has mapped and accessed a page which is not
 547                          * actually RAM. */
 548                         vcpu->arch.paddr_accessed = gpaddr;
 549                         r = kvmppc_emulate_mmio(run, vcpu);
 550                         kvmppc_account_exit(vcpu, MMIO_EXITS);
 551                 }
 552
 553                 break;
 554         }
 555
 556         case BOOKE_INTERRUPT_ITLB_MISS: {
 557                 unsigned long eaddr = vcpu->arch.pc;
 558                 gpa_t gpaddr;
 559                 gfn_t gfn;
 560                 int gtlb_index;
 561
 562                 r = RESUME_GUEST;
 563
 564                 /* Check the guest TLB. */
 565                 gtlb_index = kvmppc_mmu_itlb_index(vcpu, eaddr);
 566                 if (gtlb_index < 0) {
 567                         /* The guest didn't have a mapping for it. */
 568                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS);
 569                         kvmppc_mmu_itlb_miss(vcpu);
 570                         kvmppc_account_exit(vcpu, ITLB_REAL_MISS_EXITS);
 571                         break;
 572                 }
 573
 574                 kvmppc_account_exit(vcpu, ITLB_VIRT_MISS_EXITS);
 575
 576                 gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
 577                 gfn = gpaddr >> PAGE_SHIFT;
 578
 579                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 580                         /* The guest TLB had a mapping, but the shadow TLB
 581                          * didn't. This could be because:
 582                          * a) the entry is mapping the host kernel, or
 583                          * b) the guest used a large mapping which we're faking
 584                          * Either way, we need to satisfy the fault without
 585                          * invoking the guest. */
 586                         kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
 587                 } else {
 588                         /* Guest mapped and leaped at non-RAM! */
 589                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_MACHINE_CHECK);
 590                 }
 591
 592                 break;
 593         }
 594
 595         case BOOKE_INTERRUPT_DEBUG: {
 596                 u32 dbsr;
 597
 598                 vcpu->arch.pc = mfspr(SPRN_CSRR0);
 599
 600                 /* clear IAC events in DBSR register */
 601                 dbsr = mfspr(SPRN_DBSR);
 602                 dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4;
 603                 mtspr(SPRN_DBSR, dbsr);
 604
 605                 run->exit_reason = KVM_EXIT_DEBUG;
 606                 kvmppc_account_exit(vcpu, DEBUG_EXITS);
 607                 r = RESUME_HOST;
 608                 break;
 609         }
 610
 611         default:
 612                 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
 613                 BUG();
 614         }
 615
 616         local_irq_disable();
 617
 618         kvmppc_core_prepare_to_enter(vcpu);
 619
 620         if (!(r & RESUME_HOST)) {
 621                 /* To avoid clobbering exit_reason, only check for signals if
 622                  * we aren't already exiting to userspace for some other
 623                  * reason. */
 624                 if (signal_pending(current)) {
 625                         run->exit_reason = KVM_EXIT_INTR;
 626                         r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
 627                         kvmppc_account_exit(vcpu, SIGNAL_EXITS);
 628                 }
 629         }
 630
 631         return r;
 632 }
 633
 634 /* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
 635 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 636 {
 637         int i;
 638         int r;
 639
 640         vcpu->arch.pc = 0;
 641         vcpu->arch.shared->msr = 0;
 642         vcpu->arch.shadow_msr = MSR_USER | MSR_DE | MSR_IS | MSR_DS;
 643         kvmppc_set_gpr(vcpu, 1, (16<<20) - 8); /* -8 for the callee-save LR slot */
 644
 645         vcpu->arch.shadow_pid = 1;
 646
 647         /* Eye-catching numbers so we know if the guest takes an interrupt
 648          * before it's programmed its own IVPR/IVORs. */
 649         vcpu->arch.ivpr = 0x55550000;
 650         for (i = 0; i < BOOKE_IRQPRIO_MAX; i++)
 651                 vcpu->arch.ivor[i] = 0x7700 | i * 4;
 652
 653         kvmppc_init_timing_stats(vcpu);
 654
 655         r = kvmppc_core_vcpu_setup(vcpu);
 656         kvmppc_sanity_check(vcpu);
 657         return r;
 658 }
 659
 660 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 661 {
 662         int i;
 663
 664         regs->pc = vcpu->arch.pc;
 665         regs->cr = kvmppc_get_cr(vcpu);
 666         regs->ctr = vcpu->arch.ctr;
 667         regs->lr = vcpu->arch.lr;
 668         regs->xer = kvmppc_get_xer(vcpu);
 669         regs->msr = vcpu->arch.shared->msr;
 670         regs->srr0 = vcpu->arch.shared->srr0;
 671         regs->srr1 = vcpu->arch.shared->srr1;
 672         regs->pid = vcpu->arch.pid;
 673         regs->sprg0 = vcpu->arch.shared->sprg0;
 674         regs->sprg1 = vcpu->arch.shared->sprg1;
 675         regs->sprg2 = vcpu->arch.shared->sprg2;
 676         regs->sprg3 = vcpu->arch.shared->sprg3;
 677         regs->sprg4 = vcpu->arch.sprg4;
 678         regs->sprg5 = vcpu->arch.sprg5;
 679         regs->sprg6 = vcpu->arch.sprg6;
 680         regs->sprg7 = vcpu->arch.sprg7;
 681
 682         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 683                 regs->gpr[i] = kvmppc_get_gpr(vcpu, i);
 684
 685         return 0;
 686 }
 687
 688 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 689 {
 690         int i;
 691
 692         vcpu->arch.pc = regs->pc;
 693         kvmppc_set_cr(vcpu, regs->cr);
 694         vcpu->arch.ctr = regs->ctr;
 695         vcpu->arch.lr = regs->lr;
 696         kvmppc_set_xer(vcpu, regs->xer);
 697         kvmppc_set_msr(vcpu, regs->msr);
 698         vcpu->arch.shared->srr0 = regs->srr0;
 699         vcpu->arch.shared->srr1 = regs->srr1;
 700         kvmppc_set_pid(vcpu, regs->pid);
 701         vcpu->arch.shared->sprg0 = regs->sprg0;
 702         vcpu->arch.shared->sprg1 = regs->sprg1;
 703         vcpu->arch.shared->sprg2 = regs->sprg2;
 704         vcpu->arch.shared->sprg3 = regs->sprg3;
 705         vcpu->arch.sprg4 = regs->sprg4;
 706         vcpu->arch.sprg5 = regs->sprg5;
 707         vcpu->arch.sprg6 = regs->sprg6;
 708         vcpu->arch.sprg7 = regs->sprg7;
 709
 710         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 711                 kvmppc_set_gpr(vcpu, i, regs->gpr[i]);
 712
 713         return 0;
 714 }
 715
 716 static void get_sregs_base(struct kvm_vcpu *vcpu,
 717                            struct kvm_sregs *sregs)
 718 {
 719         u64 tb = get_tb();
 720
 721         sregs->u.e.features |= KVM_SREGS_E_BASE;
 722
 723         sregs->u.e.csrr0 = vcpu->arch.csrr0;
 724         sregs->u.e.csrr1 = vcpu->arch.csrr1;
 725         sregs->u.e.mcsr = vcpu->arch.mcsr;
 726         sregs->u.e.esr = vcpu->arch.esr;
 727         sregs->u.e.dear = vcpu->arch.shared->dar;
 728         sregs->u.e.tsr = vcpu->arch.tsr;
 729         sregs->u.e.tcr = vcpu->arch.tcr;
 730         sregs->u.e.dec = kvmppc_get_dec(vcpu, tb);
 731         sregs->u.e.tb = tb;
 732         sregs->u.e.vrsave = vcpu->arch.vrsave;
 733 }
 734
 735 static int set_sregs_base(struct kvm_vcpu *vcpu,
 736                           struct kvm_sregs *sregs)
 737 {
 738         if (!(sregs->u.e.features & KVM_SREGS_E_BASE))
 739                 return 0;
 740
 741         vcpu->arch.csrr0 = sregs->u.e.csrr0;
 742         vcpu->arch.csrr1 = sregs->u.e.csrr1;
 743         vcpu->arch.mcsr = sregs->u.e.mcsr;
 744         vcpu->arch.esr = sregs->u.e.esr;
 745         vcpu->arch.shared->dar = sregs->u.e.dear;
 746         vcpu->arch.vrsave = sregs->u.e.vrsave;
 747         vcpu->arch.tcr = sregs->u.e.tcr;
 748
 749         if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_DEC)
 750                 vcpu->arch.dec = sregs->u.e.dec;
 751
 752         kvmppc_emulate_dec(vcpu);
 753
 754         if (sregs->u.e.update_special & KVM_SREGS_E_UPDATE_TSR) {
 755                 /*
 756                  * FIXME: existing KVM timer handling is incomplete.
 757                  * TSR cannot be read by the guest, and its value in
 758                  * vcpu->arch is always zero.  For now, just handle
 759                  * the case where the caller is trying to inject a
 760                  * decrementer interrupt.
 761                  */
 762
 763                 if ((sregs->u.e.tsr & TSR_DIS) &&
 764                     (vcpu->arch.tcr & TCR_DIE))
 765                         kvmppc_core_queue_dec(vcpu);
 766         }
 767
 768         return 0;
 769 }
 770
 771 static void get_sregs_arch206(struct kvm_vcpu *vcpu,
 772                               struct kvm_sregs *sregs)
 773 {
 774         sregs->u.e.features |= KVM_SREGS_E_ARCH206;
 775
 776         sregs->u.e.pir = vcpu->vcpu_id;
 777         sregs->u.e.mcsrr0 = vcpu->arch.mcsrr0;
 778         sregs->u.e.mcsrr1 = vcpu->arch.mcsrr1;
 779         sregs->u.e.decar = vcpu->arch.decar;
 780         sregs->u.e.ivpr = vcpu->arch.ivpr;
 781 }
 782
 783 static int set_sregs_arch206(struct kvm_vcpu *vcpu,
 784                              struct kvm_sregs *sregs)
 785 {
 786         if (!(sregs->u.e.features & KVM_SREGS_E_ARCH206))
 787                 return 0;
 788
 789         if (sregs->u.e.pir != vcpu->vcpu_id)
 790                 return -EINVAL;
 791
 792         vcpu->arch.mcsrr0 = sregs->u.e.mcsrr0;
 793         vcpu->arch.mcsrr1 = sregs->u.e.mcsrr1;
 794         vcpu->arch.decar = sregs->u.e.decar;
 795         vcpu->arch.ivpr = sregs->u.e.ivpr;
 796
 797         return 0;
 798 }
 799
 800 void kvmppc_get_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 801 {
 802         sregs->u.e.features |= KVM_SREGS_E_IVOR;
 803
 804         sregs->u.e.ivor_low[0] = vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL];
 805         sregs->u.e.ivor_low[1] = vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK];
 806         sregs->u.e.ivor_low[2] = vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE];
 807         sregs->u.e.ivor_low[3] = vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE];
 808         sregs->u.e.ivor_low[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL];
 809         sregs->u.e.ivor_low[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT];
 810         sregs->u.e.ivor_low[6] = vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM];
 811         sregs->u.e.ivor_low[7] = vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL];
 812         sregs->u.e.ivor_low[8] = vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL];
 813         sregs->u.e.ivor_low[9] = vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL];
 814         sregs->u.e.ivor_low[10] = vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER];
 815         sregs->u.e.ivor_low[11] = vcpu->arch.ivor[BOOKE_IRQPRIO_FIT];
 816         sregs->u.e.ivor_low[12] = vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG];
 817         sregs->u.e.ivor_low[13] = vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS];
 818         sregs->u.e.ivor_low[14] = vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS];
 819         sregs->u.e.ivor_low[15] = vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG];
 820 }
 821
 822 int kvmppc_set_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 823 {
 824         if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
 825                 return 0;
 826
 827         vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL] = sregs->u.e.ivor_low[0];
 828         vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK] = sregs->u.e.ivor_low[1];
 829         vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE] = sregs->u.e.ivor_low[2];
 830         vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE] = sregs->u.e.ivor_low[3];
 831         vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL] = sregs->u.e.ivor_low[4];
 832         vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT] = sregs->u.e.ivor_low[5];
 833         vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM] = sregs->u.e.ivor_low[6];
 834         vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL] = sregs->u.e.ivor_low[7];
 835         vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL] = sregs->u.e.ivor_low[8];
 836         vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL] = sregs->u.e.ivor_low[9];
 837         vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER] = sregs->u.e.ivor_low[10];
 838         vcpu->arch.ivor[BOOKE_IRQPRIO_FIT] = sregs->u.e.ivor_low[11];
 839         vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG] = sregs->u.e.ivor_low[12];
 840         vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS] = sregs->u.e.ivor_low[13];
 841         vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS] = sregs->u.e.ivor_low[14];
 842         vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG] = sregs->u.e.ivor_low[15];
 843
 844         return 0;
 845 }
 846
 847 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 848                                   struct kvm_sregs *sregs)
 849 {
 850         sregs->pvr = vcpu->arch.pvr;
 851
 852         get_sregs_base(vcpu, sregs);
 853         get_sregs_arch206(vcpu, sregs);
 854         kvmppc_core_get_sregs(vcpu, sregs);
 855         return 0;
 856 }
 857
 858 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 859                                   struct kvm_sregs *sregs)
 860 {
 861         int ret;
 862
 863         if (vcpu->arch.pvr != sregs->pvr)
 864                 return -EINVAL;
 865
 866         ret = set_sregs_base(vcpu, sregs);
 867         if (ret < 0)
 868                 return ret;
 869
 870         ret = set_sregs_arch206(vcpu, sregs);
 871         if (ret < 0)
 872                 return ret;
 873
 874         return kvmppc_core_set_sregs(vcpu, sregs);
 875 }
 876
 877 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 878 {
 879         return -ENOTSUPP;
 880 }
 881
 882 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 883 {
 884         return -ENOTSUPP;
 885 }
 886
 887 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 888                                   struct kvm_translation *tr)
 889 {
 890         int r;
 891
 892         r = kvmppc_core_vcpu_translate(vcpu, tr);
 893         return r;
 894 }
 895
 896 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 897 {
 898         return -ENOTSUPP;
 899 }
 900
 901 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
 902                                       struct kvm_userspace_memory_region *mem)
 903 {
 904         return 0;
 905 }
 906
 907 void kvmppc_core_commit_memory_region(struct kvm *kvm,
 908                                 struct kvm_userspace_memory_region *mem)
 909 {
 910 }
 911
 912 int kvmppc_core_init_vm(struct kvm *kvm)
 913 {
 914         return 0;
 915 }
 916
 917 void kvmppc_core_destroy_vm(struct kvm *kvm)
 918 {
 919 }
 920
 921 int __init kvmppc_booke_init(void)
 922 {
 923         unsigned long ivor[16];
 924         unsigned long max_ivor = 0;
 925         int i;
 926
 927         /* We install our own exception handlers by hijacking IVPR. IVPR must
 928          * be 16-bit aligned, so we need a 64KB allocation. */
 929         kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
 930                                                  VCPU_SIZE_ORDER);
 931         if (!kvmppc_booke_handlers)
 932                 return -ENOMEM;
 933
 934         /* XXX make sure our handlers are smaller than Linux's */
 935
 936         /* Copy our interrupt handlers to match host IVORs. That way we don't
 937          * have to swap the IVORs on every guest/host transition. */
 938         ivor[0] = mfspr(SPRN_IVOR0);
 939         ivor[1] = mfspr(SPRN_IVOR1);
 940         ivor[2] = mfspr(SPRN_IVOR2);
 941         ivor[3] = mfspr(SPRN_IVOR3);
 942         ivor[4] = mfspr(SPRN_IVOR4);
 943         ivor[5] = mfspr(SPRN_IVOR5);
 944         ivor[6] = mfspr(SPRN_IVOR6);
 945         ivor[7] = mfspr(SPRN_IVOR7);
 946         ivor[8] = mfspr(SPRN_IVOR8);
 947         ivor[9] = mfspr(SPRN_IVOR9);
 948         ivor[10] = mfspr(SPRN_IVOR10);
 949         ivor[11] = mfspr(SPRN_IVOR11);
 950         ivor[12] = mfspr(SPRN_IVOR12);
 951         ivor[13] = mfspr(SPRN_IVOR13);
 952         ivor[14] = mfspr(SPRN_IVOR14);
 953         ivor[15] = mfspr(SPRN_IVOR15);
 954
 955         for (i = 0; i < 16; i++) {
 956                 if (ivor[i] > max_ivor)
 957                         max_ivor = ivor[i];
 958
 959                 memcpy((void *)kvmppc_booke_handlers + ivor[i],
 960                        kvmppc_handlers_start + i * kvmppc_handler_len,
 961                        kvmppc_handler_len);
 962         }
 963         flush_icache_range(kvmppc_booke_handlers,
 964                            kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
 965
 966         return 0;
 967 }
 968
 969 void __exit kvmppc_booke_exit(void)
 970 {
 971         free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
 972         kvm_exit();
 973 }