arch/mips/kvm/mips.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * KVM/MIPS: MIPS specific KVM APIs
   7  *
   8  * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
   9  * Authors: Sanjay Lal <[email protected]>
  10  */
  11
  12 #include <linux/errno.h>
  13 #include <linux/err.h>
  14 #include <linux/module.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/fs.h>
  17 #include <linux/bootmem.h>
  18 #include <asm/page.h>
  19 #include <asm/cacheflush.h>
  20 #include <asm/mmu_context.h>
  21
  22 #include <linux/kvm_host.h>
  23
  24 #include "interrupt.h"
  25 #include "commpage.h"
  26
  27 #define CREATE_TRACE_POINTS
  28 #include "trace.h"
  29
  30 #ifndef VECTORSPACING
  31 #define VECTORSPACING 0x100     /* for EI/VI mode */
  32 #endif
  33
  34 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x)
  35 struct kvm_stats_debugfs_item debugfs_entries[] = {
  36         { "wait",         VCPU_STAT(wait_exits),         KVM_STAT_VCPU },
  37         { "cache",        VCPU_STAT(cache_exits),        KVM_STAT_VCPU },
  38         { "signal",       VCPU_STAT(signal_exits),       KVM_STAT_VCPU },
  39         { "interrupt",    VCPU_STAT(int_exits),          KVM_STAT_VCPU },
  40         { "cop_unsuable", VCPU_STAT(cop_unusable_exits), KVM_STAT_VCPU },
  41         { "tlbmod",       VCPU_STAT(tlbmod_exits),       KVM_STAT_VCPU },
  42         { "tlbmiss_ld",   VCPU_STAT(tlbmiss_ld_exits),   KVM_STAT_VCPU },
  43         { "tlbmiss_st",   VCPU_STAT(tlbmiss_st_exits),   KVM_STAT_VCPU },
  44         { "addrerr_st",   VCPU_STAT(addrerr_st_exits),   KVM_STAT_VCPU },
  45         { "addrerr_ld",   VCPU_STAT(addrerr_ld_exits),   KVM_STAT_VCPU },
  46         { "syscall",      VCPU_STAT(syscall_exits),      KVM_STAT_VCPU },
  47         { "resvd_inst",   VCPU_STAT(resvd_inst_exits),   KVM_STAT_VCPU },
  48         { "break_inst",   VCPU_STAT(break_inst_exits),   KVM_STAT_VCPU },
  49         { "flush_dcache", VCPU_STAT(flush_dcache_exits), KVM_STAT_VCPU },
  50         { "halt_wakeup",  VCPU_STAT(halt_wakeup),        KVM_STAT_VCPU },
  51         {NULL}
  52 };
  53
  54 static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
  55 {
  56         int i;
  57
  58         for_each_possible_cpu(i) {
  59                 vcpu->arch.guest_kernel_asid[i] = 0;
  60                 vcpu->arch.guest_user_asid[i] = 0;
  61         }
  62
  63         return 0;
  64 }
  65
  66 /*
  67  * XXXKYMA: We are simulatoring a processor that has the WII bit set in
  68  * Config7, so we are "runnable" if interrupts are pending
  69  */
  70 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
  71 {
  72         return !!(vcpu->arch.pending_exceptions);
  73 }
  74
  75 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  76 {
  77         return 1;
  78 }
  79
  80 int kvm_arch_hardware_enable(void *garbage)
  81 {
  82         return 0;
  83 }
  84
  85 void kvm_arch_hardware_disable(void *garbage)
  86 {
  87 }
  88
  89 int kvm_arch_hardware_setup(void)
  90 {
  91         return 0;
  92 }
  93
  94 void kvm_arch_hardware_unsetup(void)
  95 {
  96 }
  97
  98 void kvm_arch_check_processor_compat(void *rtn)
  99 {
 100         *(int *)rtn = 0;
 101 }
 102
 103 static void kvm_mips_init_tlbs(struct kvm *kvm)
 104 {
 105         unsigned long wired;
 106
 107         /*
 108          * Add a wired entry to the TLB, it is used to map the commpage to
 109          * the Guest kernel
 110          */
 111         wired = read_c0_wired();
 112         write_c0_wired(wired + 1);
 113         mtc0_tlbw_hazard();
 114         kvm->arch.commpage_tlb = wired;
 115
 116         kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
 117                   kvm->arch.commpage_tlb);
 118 }
 119
 120 static void kvm_mips_init_vm_percpu(void *arg)
 121 {
 122         struct kvm *kvm = (struct kvm *)arg;
 123
 124         kvm_mips_init_tlbs(kvm);
 125         kvm_mips_callbacks->vm_init(kvm);
 126
 127 }
 128
 129 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 130 {
 131         if (atomic_inc_return(&kvm_mips_instance) == 1) {
 132                 kvm_debug("%s: 1st KVM instance, setup host TLB parameters\n",
 133                           __func__);
 134                 on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
 135         }
 136
 137         return 0;
 138 }
 139
 140 void kvm_mips_free_vcpus(struct kvm *kvm)
 141 {
 142         unsigned int i;
 143         struct kvm_vcpu *vcpu;
 144
 145         /* Put the pages we reserved for the guest pmap */
 146         for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
 147                 if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
 148                         kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
 149         }
 150         kfree(kvm->arch.guest_pmap);
 151
 152         kvm_for_each_vcpu(i, vcpu, kvm) {
 153                 kvm_arch_vcpu_free(vcpu);
 154         }
 155
 156         mutex_lock(&kvm->lock);
 157
 158         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 159                 kvm->vcpus[i] = NULL;
 160
 161         atomic_set(&kvm->online_vcpus, 0);
 162
 163         mutex_unlock(&kvm->lock);
 164 }
 165
 166 void kvm_arch_sync_events(struct kvm *kvm)
 167 {
 168 }
 169
 170 static void kvm_mips_uninit_tlbs(void *arg)
 171 {
 172         /* Restore wired count */
 173         write_c0_wired(0);
 174         mtc0_tlbw_hazard();
 175         /* Clear out all the TLBs */
 176         kvm_local_flush_tlb_all();
 177 }
 178
 179 void kvm_arch_destroy_vm(struct kvm *kvm)
 180 {
 181         kvm_mips_free_vcpus(kvm);
 182
 183         /* If this is the last instance, restore wired count */
 184         if (atomic_dec_return(&kvm_mips_instance) == 0) {
 185                 kvm_debug("%s: last KVM instance, restoring TLB parameters\n",
 186                           __func__);
 187                 on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
 188         }
 189 }
 190
 191 long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl,
 192                         unsigned long arg)
 193 {
 194         return -ENOIOCTLCMD;
 195 }
 196
 197 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
 198                            struct kvm_memory_slot *dont)
 199 {
 200 }
 201
 202 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
 203                             unsigned long npages)
 204 {
 205         return 0;
 206 }
 207
 208 void kvm_arch_memslots_updated(struct kvm *kvm)
 209 {
 210 }
 211
 212 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 213                                    struct kvm_memory_slot *memslot,
 214                                    struct kvm_userspace_memory_region *mem,
 215                                    enum kvm_mr_change change)
 216 {
 217         return 0;
 218 }
 219
 220 void kvm_arch_commit_memory_region(struct kvm *kvm,
 221                                    struct kvm_userspace_memory_region *mem,
 222                                    const struct kvm_memory_slot *old,
 223                                    enum kvm_mr_change change)
 224 {
 225         unsigned long npages = 0;
 226         int i;
 227
 228         kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
 229                   __func__, kvm, mem->slot, mem->guest_phys_addr,
 230                   mem->memory_size, mem->userspace_addr);
 231
 232         /* Setup Guest PMAP table */
 233         if (!kvm->arch.guest_pmap) {
 234                 if (mem->slot == 0)
 235                         npages = mem->memory_size >> PAGE_SHIFT;
 236
 237                 if (npages) {
 238                         kvm->arch.guest_pmap_npages = npages;
 239                         kvm->arch.guest_pmap =
 240                             kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
 241
 242                         if (!kvm->arch.guest_pmap) {
 243                                 kvm_err("Failed to allocate guest PMAP");
 244                                 return;
 245                         }
 246
 247                         kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
 248                                   npages, kvm->arch.guest_pmap);
 249
 250                         /* Now setup the page table */
 251                         for (i = 0; i < npages; i++)
 252                                 kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
 253                 }
 254         }
 255 }
 256
 257 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 258 {
 259 }
 260
 261 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 262                                    struct kvm_memory_slot *slot)
 263 {
 264 }
 265
 266 void kvm_arch_flush_shadow(struct kvm *kvm)
 267 {
 268 }
 269
 270 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 271 {
 272         int err, size, offset;
 273         void *gebase;
 274         int i;
 275
 276         struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
 277
 278         if (!vcpu) {
 279                 err = -ENOMEM;
 280                 goto out;
 281         }
 282
 283         err = kvm_vcpu_init(vcpu, kvm, id);
 284
 285         if (err)
 286                 goto out_free_cpu;
 287
 288         kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
 289
 290         /*
 291          * Allocate space for host mode exception handlers that handle
 292          * guest mode exits
 293          */
 294         if (cpu_has_veic || cpu_has_vint)
 295                 size = 0x200 + VECTORSPACING * 64;
 296         else
 297                 size = 0x4000;
 298
 299         /* Save Linux EBASE */
 300         vcpu->arch.host_ebase = (void *)read_c0_ebase();
 301
 302         gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
 303
 304         if (!gebase) {
 305                 err = -ENOMEM;
 306                 goto out_free_cpu;
 307         }
 308         kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n",
 309                   ALIGN(size, PAGE_SIZE), gebase);
 310
 311         /* Save new ebase */
 312         vcpu->arch.guest_ebase = gebase;
 313
 314         /* Copy L1 Guest Exception handler to correct offset */
 315
 316         /* TLB Refill, EXL = 0 */
 317         memcpy(gebase, mips32_exception,
 318                mips32_exceptionEnd - mips32_exception);
 319
 320         /* General Exception Entry point */
 321         memcpy(gebase + 0x180, mips32_exception,
 322                mips32_exceptionEnd - mips32_exception);
 323
 324         /* For vectored interrupts poke the exception code @ all offsets 0-7 */
 325         for (i = 0; i < 8; i++) {
 326                 kvm_debug("L1 Vectored handler @ %p\n",
 327                           gebase + 0x200 + (i * VECTORSPACING));
 328                 memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
 329                        mips32_exceptionEnd - mips32_exception);
 330         }
 331
 332         /* General handler, relocate to unmapped space for sanity's sake */
 333         offset = 0x2000;
 334         kvm_debug("Installing KVM Exception handlers @ %p, %#x bytes\n",
 335                   gebase + offset,
 336                   mips32_GuestExceptionEnd - mips32_GuestException);
 337
 338         memcpy(gebase + offset, mips32_GuestException,
 339                mips32_GuestExceptionEnd - mips32_GuestException);
 340
 341         /* Invalidate the icache for these ranges */
 342         local_flush_icache_range((unsigned long)gebase,
 343                                 (unsigned long)gebase + ALIGN(size, PAGE_SIZE));
 344
 345         /*
 346          * Allocate comm page for guest kernel, a TLB will be reserved for
 347          * mapping GVA @ 0xFFFF8000 to this page
 348          */
 349         vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
 350
 351         if (!vcpu->arch.kseg0_commpage) {
 352                 err = -ENOMEM;
 353                 goto out_free_gebase;
 354         }
 355
 356         kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
 357         kvm_mips_commpage_init(vcpu);
 358
 359         /* Init */
 360         vcpu->arch.last_sched_cpu = -1;
 361
 362         /* Start off the timer */
 363         kvm_mips_init_count(vcpu);
 364
 365         return vcpu;
 366
 367 out_free_gebase:
 368         kfree(gebase);
 369
 370 out_free_cpu:
 371         kfree(vcpu);
 372
 373 out:
 374         return ERR_PTR(err);
 375 }
 376
 377 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 378 {
 379         hrtimer_cancel(&vcpu->arch.comparecount_timer);
 380
 381         kvm_vcpu_uninit(vcpu);
 382
 383         kvm_mips_dump_stats(vcpu);
 384
 385         kfree(vcpu->arch.guest_ebase);
 386         kfree(vcpu->arch.kseg0_commpage);
 387         kfree(vcpu);
 388 }
 389
 390 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 391 {
 392         kvm_arch_vcpu_free(vcpu);
 393 }
 394
 395 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 396                                         struct kvm_guest_debug *dbg)
 397 {
 398         return -ENOIOCTLCMD;
 399 }
 400
 401 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 402 {
 403         int r = 0;
 404         sigset_t sigsaved;
 405
 406         if (vcpu->sigset_active)
 407                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 408
 409         if (vcpu->mmio_needed) {
 410                 if (!vcpu->mmio_is_write)
 411                         kvm_mips_complete_mmio_load(vcpu, run);
 412                 vcpu->mmio_needed = 0;
 413         }
 414
 415         local_irq_disable();
 416         /* Check if we have any exceptions/interrupts pending */
 417         kvm_mips_deliver_interrupts(vcpu,
 418                                     kvm_read_c0_guest_cause(vcpu->arch.cop0));
 419
 420         kvm_guest_enter();
 421
 422         r = __kvm_mips_vcpu_run(run, vcpu);
 423
 424         kvm_guest_exit();
 425         local_irq_enable();
 426
 427         if (vcpu->sigset_active)
 428                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 429
 430         return r;
 431 }
 432
 433 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
 434                              struct kvm_mips_interrupt *irq)
 435 {
 436         int intr = (int)irq->irq;
 437         struct kvm_vcpu *dvcpu = NULL;
 438
 439         if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
 440                 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
 441                           (int)intr);
 442
 443         if (irq->cpu == -1)
 444                 dvcpu = vcpu;
 445         else
 446                 dvcpu = vcpu->kvm->vcpus[irq->cpu];
 447
 448         if (intr == 2 || intr == 3 || intr == 4) {
 449                 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
 450
 451         } else if (intr == -2 || intr == -3 || intr == -4) {
 452                 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
 453         } else {
 454                 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
 455                         irq->cpu, irq->irq);
 456                 return -EINVAL;
 457         }
 458
 459         dvcpu->arch.wait = 0;
 460
 461         if (waitqueue_active(&dvcpu->wq))
 462                 wake_up_interruptible(&dvcpu->wq);
 463
 464         return 0;
 465 }
 466
 467 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 468                                     struct kvm_mp_state *mp_state)
 469 {
 470         return -ENOIOCTLCMD;
 471 }
 472
 473 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 474                                     struct kvm_mp_state *mp_state)
 475 {
 476         return -ENOIOCTLCMD;
 477 }
 478
 479 static u64 kvm_mips_get_one_regs[] = {
 480         KVM_REG_MIPS_R0,
 481         KVM_REG_MIPS_R1,
 482         KVM_REG_MIPS_R2,
 483         KVM_REG_MIPS_R3,
 484         KVM_REG_MIPS_R4,
 485         KVM_REG_MIPS_R5,
 486         KVM_REG_MIPS_R6,
 487         KVM_REG_MIPS_R7,
 488         KVM_REG_MIPS_R8,
 489         KVM_REG_MIPS_R9,
 490         KVM_REG_MIPS_R10,
 491         KVM_REG_MIPS_R11,
 492         KVM_REG_MIPS_R12,
 493         KVM_REG_MIPS_R13,
 494         KVM_REG_MIPS_R14,
 495         KVM_REG_MIPS_R15,
 496         KVM_REG_MIPS_R16,
 497         KVM_REG_MIPS_R17,
 498         KVM_REG_MIPS_R18,
 499         KVM_REG_MIPS_R19,
 500         KVM_REG_MIPS_R20,
 501         KVM_REG_MIPS_R21,
 502         KVM_REG_MIPS_R22,
 503         KVM_REG_MIPS_R23,
 504         KVM_REG_MIPS_R24,
 505         KVM_REG_MIPS_R25,
 506         KVM_REG_MIPS_R26,
 507         KVM_REG_MIPS_R27,
 508         KVM_REG_MIPS_R28,
 509         KVM_REG_MIPS_R29,
 510         KVM_REG_MIPS_R30,
 511         KVM_REG_MIPS_R31,
 512
 513         KVM_REG_MIPS_HI,
 514         KVM_REG_MIPS_LO,
 515         KVM_REG_MIPS_PC,
 516
 517         KVM_REG_MIPS_CP0_INDEX,
 518         KVM_REG_MIPS_CP0_CONTEXT,
 519         KVM_REG_MIPS_CP0_USERLOCAL,
 520         KVM_REG_MIPS_CP0_PAGEMASK,
 521         KVM_REG_MIPS_CP0_WIRED,
 522         KVM_REG_MIPS_CP0_HWRENA,
 523         KVM_REG_MIPS_CP0_BADVADDR,
 524         KVM_REG_MIPS_CP0_COUNT,
 525         KVM_REG_MIPS_CP0_ENTRYHI,
 526         KVM_REG_MIPS_CP0_COMPARE,
 527         KVM_REG_MIPS_CP0_STATUS,
 528         KVM_REG_MIPS_CP0_CAUSE,
 529         KVM_REG_MIPS_CP0_EPC,
 530         KVM_REG_MIPS_CP0_CONFIG,
 531         KVM_REG_MIPS_CP0_CONFIG1,
 532         KVM_REG_MIPS_CP0_CONFIG2,
 533         KVM_REG_MIPS_CP0_CONFIG3,
 534         KVM_REG_MIPS_CP0_CONFIG7,
 535         KVM_REG_MIPS_CP0_ERROREPC,
 536
 537         KVM_REG_MIPS_COUNT_CTL,
 538         KVM_REG_MIPS_COUNT_RESUME,
 539         KVM_REG_MIPS_COUNT_HZ,
 540 };
 541
 542 static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
 543                             const struct kvm_one_reg *reg)
 544 {
 545         struct mips_coproc *cop0 = vcpu->arch.cop0;
 546         int ret;
 547         s64 v;
 548
 549         switch (reg->id) {
 550         case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
 551                 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
 552                 break;
 553         case KVM_REG_MIPS_HI:
 554                 v = (long)vcpu->arch.hi;
 555                 break;
 556         case KVM_REG_MIPS_LO:
 557                 v = (long)vcpu->arch.lo;
 558                 break;
 559         case KVM_REG_MIPS_PC:
 560                 v = (long)vcpu->arch.pc;
 561                 break;
 562
 563         case KVM_REG_MIPS_CP0_INDEX:
 564                 v = (long)kvm_read_c0_guest_index(cop0);
 565                 break;
 566         case KVM_REG_MIPS_CP0_CONTEXT:
 567                 v = (long)kvm_read_c0_guest_context(cop0);
 568                 break;
 569         case KVM_REG_MIPS_CP0_USERLOCAL:
 570                 v = (long)kvm_read_c0_guest_userlocal(cop0);
 571                 break;
 572         case KVM_REG_MIPS_CP0_PAGEMASK:
 573                 v = (long)kvm_read_c0_guest_pagemask(cop0);
 574                 break;
 575         case KVM_REG_MIPS_CP0_WIRED:
 576                 v = (long)kvm_read_c0_guest_wired(cop0);
 577                 break;
 578         case KVM_REG_MIPS_CP0_HWRENA:
 579                 v = (long)kvm_read_c0_guest_hwrena(cop0);
 580                 break;
 581         case KVM_REG_MIPS_CP0_BADVADDR:
 582                 v = (long)kvm_read_c0_guest_badvaddr(cop0);
 583                 break;
 584         case KVM_REG_MIPS_CP0_ENTRYHI:
 585                 v = (long)kvm_read_c0_guest_entryhi(cop0);
 586                 break;
 587         case KVM_REG_MIPS_CP0_COMPARE:
 588                 v = (long)kvm_read_c0_guest_compare(cop0);
 589                 break;
 590         case KVM_REG_MIPS_CP0_STATUS:
 591                 v = (long)kvm_read_c0_guest_status(cop0);
 592                 break;
 593         case KVM_REG_MIPS_CP0_CAUSE:
 594                 v = (long)kvm_read_c0_guest_cause(cop0);
 595                 break;
 596         case KVM_REG_MIPS_CP0_EPC:
 597                 v = (long)kvm_read_c0_guest_epc(cop0);
 598                 break;
 599         case KVM_REG_MIPS_CP0_ERROREPC:
 600                 v = (long)kvm_read_c0_guest_errorepc(cop0);
 601                 break;
 602         case KVM_REG_MIPS_CP0_CONFIG:
 603                 v = (long)kvm_read_c0_guest_config(cop0);
 604                 break;
 605         case KVM_REG_MIPS_CP0_CONFIG1:
 606                 v = (long)kvm_read_c0_guest_config1(cop0);
 607                 break;
 608         case KVM_REG_MIPS_CP0_CONFIG2:
 609                 v = (long)kvm_read_c0_guest_config2(cop0);
 610                 break;
 611         case KVM_REG_MIPS_CP0_CONFIG3:
 612                 v = (long)kvm_read_c0_guest_config3(cop0);
 613                 break;
 614         case KVM_REG_MIPS_CP0_CONFIG7:
 615                 v = (long)kvm_read_c0_guest_config7(cop0);
 616                 break;
 617         /* registers to be handled specially */
 618         case KVM_REG_MIPS_CP0_COUNT:
 619         case KVM_REG_MIPS_COUNT_CTL:
 620         case KVM_REG_MIPS_COUNT_RESUME:
 621         case KVM_REG_MIPS_COUNT_HZ:
 622                 ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v);
 623                 if (ret)
 624                         return ret;
 625                 break;
 626         default:
 627                 return -EINVAL;
 628         }
 629         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 630                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 631
 632                 return put_user(v, uaddr64);
 633         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 634                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 635                 u32 v32 = (u32)v;
 636
 637                 return put_user(v32, uaddr32);
 638         } else {
 639                 return -EINVAL;
 640         }
 641 }
 642
 643 static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
 644                             const struct kvm_one_reg *reg)
 645 {
 646         struct mips_coproc *cop0 = vcpu->arch.cop0;
 647         u64 v;
 648
 649         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 650                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 651
 652                 if (get_user(v, uaddr64) != 0)
 653                         return -EFAULT;
 654         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 655                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 656                 s32 v32;
 657
 658                 if (get_user(v32, uaddr32) != 0)
 659                         return -EFAULT;
 660                 v = (s64)v32;
 661         } else {
 662                 return -EINVAL;
 663         }
 664
 665         switch (reg->id) {
 666         case KVM_REG_MIPS_R0:
 667                 /* Silently ignore requests to set $0 */
 668                 break;
 669         case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
 670                 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
 671                 break;
 672         case KVM_REG_MIPS_HI:
 673                 vcpu->arch.hi = v;
 674                 break;
 675         case KVM_REG_MIPS_LO:
 676                 vcpu->arch.lo = v;
 677                 break;
 678         case KVM_REG_MIPS_PC:
 679                 vcpu->arch.pc = v;
 680                 break;
 681
 682         case KVM_REG_MIPS_CP0_INDEX:
 683                 kvm_write_c0_guest_index(cop0, v);
 684                 break;
 685         case KVM_REG_MIPS_CP0_CONTEXT:
 686                 kvm_write_c0_guest_context(cop0, v);
 687                 break;
 688         case KVM_REG_MIPS_CP0_USERLOCAL:
 689                 kvm_write_c0_guest_userlocal(cop0, v);
 690                 break;
 691         case KVM_REG_MIPS_CP0_PAGEMASK:
 692                 kvm_write_c0_guest_pagemask(cop0, v);
 693                 break;
 694         case KVM_REG_MIPS_CP0_WIRED:
 695                 kvm_write_c0_guest_wired(cop0, v);
 696                 break;
 697         case KVM_REG_MIPS_CP0_HWRENA:
 698                 kvm_write_c0_guest_hwrena(cop0, v);
 699                 break;
 700         case KVM_REG_MIPS_CP0_BADVADDR:
 701                 kvm_write_c0_guest_badvaddr(cop0, v);
 702                 break;
 703         case KVM_REG_MIPS_CP0_ENTRYHI:
 704                 kvm_write_c0_guest_entryhi(cop0, v);
 705                 break;
 706         case KVM_REG_MIPS_CP0_STATUS:
 707                 kvm_write_c0_guest_status(cop0, v);
 708                 break;
 709         case KVM_REG_MIPS_CP0_EPC:
 710                 kvm_write_c0_guest_epc(cop0, v);
 711                 break;
 712         case KVM_REG_MIPS_CP0_ERROREPC:
 713                 kvm_write_c0_guest_errorepc(cop0, v);
 714                 break;
 715         /* registers to be handled specially */
 716         case KVM_REG_MIPS_CP0_COUNT:
 717         case KVM_REG_MIPS_CP0_COMPARE:
 718         case KVM_REG_MIPS_CP0_CAUSE:
 719         case KVM_REG_MIPS_COUNT_CTL:
 720         case KVM_REG_MIPS_COUNT_RESUME:
 721         case KVM_REG_MIPS_COUNT_HZ:
 722                 return kvm_mips_callbacks->set_one_reg(vcpu, reg, v);
 723         default:
 724                 return -EINVAL;
 725         }
 726         return 0;
 727 }
 728
 729 long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
 730                          unsigned long arg)
 731 {
 732         struct kvm_vcpu *vcpu = filp->private_data;
 733         void __user *argp = (void __user *)arg;
 734         long r;
 735
 736         switch (ioctl) {
 737         case KVM_SET_ONE_REG:
 738         case KVM_GET_ONE_REG: {
 739                 struct kvm_one_reg reg;
 740
 741                 if (copy_from_user(&reg, argp, sizeof(reg)))
 742                         return -EFAULT;
 743                 if (ioctl == KVM_SET_ONE_REG)
 744                         return kvm_mips_set_reg(vcpu, &reg);
 745                 else
 746                         return kvm_mips_get_reg(vcpu, &reg);
 747         }
 748         case KVM_GET_REG_LIST: {
 749                 struct kvm_reg_list __user *user_list = argp;
 750                 u64 __user *reg_dest;
 751                 struct kvm_reg_list reg_list;
 752                 unsigned n;
 753
 754                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 755                         return -EFAULT;
 756                 n = reg_list.n;
 757                 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
 758                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 759                         return -EFAULT;
 760                 if (n < reg_list.n)
 761                         return -E2BIG;
 762                 reg_dest = user_list->reg;
 763                 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
 764                                  sizeof(kvm_mips_get_one_regs)))
 765                         return -EFAULT;
 766                 return 0;
 767         }
 768         case KVM_NMI:
 769                 /* Treat the NMI as a CPU reset */
 770                 r = kvm_mips_reset_vcpu(vcpu);
 771                 break;
 772         case KVM_INTERRUPT:
 773                 {
 774                         struct kvm_mips_interrupt irq;
 775
 776                         r = -EFAULT;
 777                         if (copy_from_user(&irq, argp, sizeof(irq)))
 778                                 goto out;
 779
 780                         kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
 781                                   irq.irq);
 782
 783                         r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 784                         break;
 785                 }
 786         default:
 787                 r = -ENOIOCTLCMD;
 788         }
 789
 790 out:
 791         return r;
 792 }
 793
 794 /* Get (and clear) the dirty memory log for a memory slot. */
 795 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 796 {
 797         struct kvm_memory_slot *memslot;
 798         unsigned long ga, ga_end;
 799         int is_dirty = 0;
 800         int r;
 801         unsigned long n;
 802
 803         mutex_lock(&kvm->slots_lock);
 804
 805         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 806         if (r)
 807                 goto out;
 808
 809         /* If nothing is dirty, don't bother messing with page tables. */
 810         if (is_dirty) {
 811                 memslot = &kvm->memslots->memslots[log->slot];
 812
 813                 ga = memslot->base_gfn << PAGE_SHIFT;
 814                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
 815
 816                 kvm_info("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
 817                          ga_end);
 818
 819                 n = kvm_dirty_bitmap_bytes(memslot);
 820                 memset(memslot->dirty_bitmap, 0, n);
 821         }
 822
 823         r = 0;
 824 out:
 825         mutex_unlock(&kvm->slots_lock);
 826         return r;
 827
 828 }
 829
 830 long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 831 {
 832         long r;
 833
 834         switch (ioctl) {
 835         default:
 836                 r = -ENOIOCTLCMD;
 837         }
 838
 839         return r;
 840 }
 841
 842 int kvm_arch_init(void *opaque)
 843 {
 844         if (kvm_mips_callbacks) {
 845                 kvm_err("kvm: module already exists\n");
 846                 return -EEXIST;
 847         }
 848
 849         return kvm_mips_emulation_init(&kvm_mips_callbacks);
 850 }
 851
 852 void kvm_arch_exit(void)
 853 {
 854         kvm_mips_callbacks = NULL;
 855 }
 856
 857 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 858                                   struct kvm_sregs *sregs)
 859 {
 860         return -ENOIOCTLCMD;
 861 }
 862
 863 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 864                                   struct kvm_sregs *sregs)
 865 {
 866         return -ENOIOCTLCMD;
 867 }
 868
 869 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 870 {
 871         return 0;
 872 }
 873
 874 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 875 {
 876         return -ENOIOCTLCMD;
 877 }
 878
 879 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 880 {
 881         return -ENOIOCTLCMD;
 882 }
 883
 884 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 885 {
 886         return VM_FAULT_SIGBUS;
 887 }
 888
 889 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 890 {
 891         int r;
 892
 893         switch (ext) {
 894         case KVM_CAP_ONE_REG:
 895                 r = 1;
 896                 break;
 897         case KVM_CAP_COALESCED_MMIO:
 898                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 899                 break;
 900         default:
 901                 r = 0;
 902                 break;
 903         }
 904         return r;
 905 }
 906
 907 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 908 {
 909         return kvm_mips_pending_timer(vcpu);
 910 }
 911
 912 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
 913 {
 914         int i;
 915         struct mips_coproc *cop0;
 916
 917         if (!vcpu)
 918                 return -1;
 919
 920         kvm_debug("VCPU Register Dump:\n");
 921         kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc);
 922         kvm_debug("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
 923
 924         for (i = 0; i < 32; i += 4) {
 925                 kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
 926                        vcpu->arch.gprs[i],
 927                        vcpu->arch.gprs[i + 1],
 928                        vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
 929         }
 930         kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi);
 931         kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo);
 932
 933         cop0 = vcpu->arch.cop0;
 934         kvm_debug("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
 935                   kvm_read_c0_guest_status(cop0),
 936                   kvm_read_c0_guest_cause(cop0));
 937
 938         kvm_debug("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
 939
 940         return 0;
 941 }
 942
 943 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 944 {
 945         int i;
 946
 947         for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 948                 vcpu->arch.gprs[i] = regs->gpr[i];
 949         vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
 950         vcpu->arch.hi = regs->hi;
 951         vcpu->arch.lo = regs->lo;
 952         vcpu->arch.pc = regs->pc;
 953
 954         return 0;
 955 }
 956
 957 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 958 {
 959         int i;
 960
 961         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 962                 regs->gpr[i] = vcpu->arch.gprs[i];
 963
 964         regs->hi = vcpu->arch.hi;
 965         regs->lo = vcpu->arch.lo;
 966         regs->pc = vcpu->arch.pc;
 967
 968         return 0;
 969 }
 970
 971 static void kvm_mips_comparecount_func(unsigned long data)
 972 {
 973         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 974
 975         kvm_mips_callbacks->queue_timer_int(vcpu);
 976
 977         vcpu->arch.wait = 0;
 978         if (waitqueue_active(&vcpu->wq))
 979                 wake_up_interruptible(&vcpu->wq);
 980 }
 981
 982 /* low level hrtimer wake routine */
 983 static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
 984 {
 985         struct kvm_vcpu *vcpu;
 986
 987         vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
 988         kvm_mips_comparecount_func((unsigned long) vcpu);
 989         return kvm_mips_count_timeout(vcpu);
 990 }
 991
 992 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 993 {
 994         kvm_mips_callbacks->vcpu_init(vcpu);
 995         hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
 996                      HRTIMER_MODE_REL);
 997         vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
 998         return 0;
 999 }
1000
1001 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
1002 {
1003 }
1004
1005 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1006                                   struct kvm_translation *tr)
1007 {
1008         return 0;
1009 }
1010
1011 /* Initial guest state */
1012 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1013 {
1014         return kvm_mips_callbacks->vcpu_setup(vcpu);
1015 }
1016
1017 static void kvm_mips_set_c0_status(void)
1018 {
1019         uint32_t status = read_c0_status();
1020
1021         if (cpu_has_fpu)
1022                 status |= (ST0_CU1);
1023
1024         if (cpu_has_dsp)
1025                 status |= (ST0_MX);
1026
1027         write_c0_status(status);
1028         ehb();
1029 }
1030
1031 /*
1032  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
1033  */
1034 int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1035 {
1036         uint32_t cause = vcpu->arch.host_cp0_cause;
1037         uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
1038         uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
1039         unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
1040         enum emulation_result er = EMULATE_DONE;
1041         int ret = RESUME_GUEST;
1042
1043         /* Set a default exit reason */
1044         run->exit_reason = KVM_EXIT_UNKNOWN;
1045         run->ready_for_interrupt_injection = 1;
1046
1047         /*
1048          * Set the appropriate status bits based on host CPU features,
1049          * before we hit the scheduler
1050          */
1051         kvm_mips_set_c0_status();
1052
1053         local_irq_enable();
1054
1055         kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
1056                         cause, opc, run, vcpu);
1057
1058         /*
1059          * Do a privilege check, if in UM most of these exit conditions end up
1060          * causing an exception to be delivered to the Guest Kernel
1061          */
1062         er = kvm_mips_check_privilege(cause, opc, run, vcpu);
1063         if (er == EMULATE_PRIV_FAIL) {
1064                 goto skip_emul;
1065         } else if (er == EMULATE_FAIL) {
1066                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1067                 ret = RESUME_HOST;
1068                 goto skip_emul;
1069         }
1070
1071         switch (exccode) {
1072         case T_INT:
1073                 kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc);
1074
1075                 ++vcpu->stat.int_exits;
1076                 trace_kvm_exit(vcpu, INT_EXITS);
1077
1078                 if (need_resched())
1079                         cond_resched();
1080
1081                 ret = RESUME_GUEST;
1082                 break;
1083
1084         case T_COP_UNUSABLE:
1085                 kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
1086
1087                 ++vcpu->stat.cop_unusable_exits;
1088                 trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
1089                 ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
1090                 /* XXXKYMA: Might need to return to user space */
1091                 if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN)
1092                         ret = RESUME_HOST;
1093                 break;
1094
1095         case T_TLB_MOD:
1096                 ++vcpu->stat.tlbmod_exits;
1097                 trace_kvm_exit(vcpu, TLBMOD_EXITS);
1098                 ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
1099                 break;
1100
1101         case T_TLB_ST_MISS:
1102                 kvm_debug("TLB ST fault:  cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
1103                           cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
1104                           badvaddr);
1105
1106                 ++vcpu->stat.tlbmiss_st_exits;
1107                 trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
1108                 ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
1109                 break;
1110
1111         case T_TLB_LD_MISS:
1112                 kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
1113                           cause, opc, badvaddr);
1114
1115                 ++vcpu->stat.tlbmiss_ld_exits;
1116                 trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
1117                 ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
1118                 break;
1119
1120         case T_ADDR_ERR_ST:
1121                 ++vcpu->stat.addrerr_st_exits;
1122                 trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
1123                 ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
1124                 break;
1125
1126         case T_ADDR_ERR_LD:
1127                 ++vcpu->stat.addrerr_ld_exits;
1128                 trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
1129                 ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
1130                 break;
1131
1132         case T_SYSCALL:
1133                 ++vcpu->stat.syscall_exits;
1134                 trace_kvm_exit(vcpu, SYSCALL_EXITS);
1135                 ret = kvm_mips_callbacks->handle_syscall(vcpu);
1136                 break;
1137
1138         case T_RES_INST:
1139                 ++vcpu->stat.resvd_inst_exits;
1140                 trace_kvm_exit(vcpu, RESVD_INST_EXITS);
1141                 ret = kvm_mips_callbacks->handle_res_inst(vcpu);
1142                 break;
1143
1144         case T_BREAK:
1145                 ++vcpu->stat.break_inst_exits;
1146                 trace_kvm_exit(vcpu, BREAK_INST_EXITS);
1147                 ret = kvm_mips_callbacks->handle_break(vcpu);
1148                 break;
1149
1150         default:
1151                 kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x  BadVaddr: %#lx Status: %#lx\n",
1152                         exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
1153                         kvm_read_c0_guest_status(vcpu->arch.cop0));
1154                 kvm_arch_vcpu_dump_regs(vcpu);
1155                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1156                 ret = RESUME_HOST;
1157                 break;
1158
1159         }
1160
1161 skip_emul:
1162         local_irq_disable();
1163
1164         if (er == EMULATE_DONE && !(ret & RESUME_HOST))
1165                 kvm_mips_deliver_interrupts(vcpu, cause);
1166
1167         if (!(ret & RESUME_HOST)) {
1168                 /* Only check for signals if not already exiting to userspace */
1169                 if (signal_pending(current)) {
1170                         run->exit_reason = KVM_EXIT_INTR;
1171                         ret = (-EINTR << 2) | RESUME_HOST;
1172                         ++vcpu->stat.signal_exits;
1173                         trace_kvm_exit(vcpu, SIGNAL_EXITS);
1174                 }
1175         }
1176
1177         return ret;
1178 }
1179
1180 int __init kvm_mips_init(void)
1181 {
1182         int ret;
1183
1184         ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1185
1186         if (ret)
1187                 return ret;
1188
1189         /*
1190          * On MIPS, kernel modules are executed from "mapped space", which
1191          * requires TLBs. The TLB handling code is statically linked with
1192          * the rest of the kernel (tlb.c) to avoid the possibility of
1193          * double faulting. The issue is that the TLB code references
1194          * routines that are part of the the KVM module, which are only
1195          * available once the module is loaded.
1196          */
1197         kvm_mips_gfn_to_pfn = gfn_to_pfn;
1198         kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
1199         kvm_mips_is_error_pfn = is_error_pfn;
1200
1201         pr_info("KVM/MIPS Initialized\n");
1202         return 0;
1203 }
1204
1205 void __exit kvm_mips_exit(void)
1206 {
1207         kvm_exit();
1208
1209         kvm_mips_gfn_to_pfn = NULL;
1210         kvm_mips_release_pfn_clean = NULL;
1211         kvm_mips_is_error_pfn = NULL;
1212
1213         pr_info("KVM/MIPS unloaded\n");
1214 }
1215
1216 module_init(kvm_mips_init);
1217 module_exit(kvm_mips_exit);
1218
1219 EXPORT_TRACEPOINT_SYMBOL(kvm_exit);