arch/mips/kvm/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 <sanjayl@kymasys.com>
  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/fpu.h>
  19 #include <asm/page.h>
  20 #include <asm/cacheflush.h>
  21 #include <asm/mmu_context.h>
  22
  23 #include <linux/kvm_host.h>
  24
  25 #include "kvm_mips_int.h"
  26 #include "kvm_mips_comm.h"
  27
  28 #define CREATE_TRACE_POINTS
  29 #include "trace.h"
  30
  31 #ifndef VECTORSPACING
  32 #define VECTORSPACING 0x100     /* for EI/VI mode */
  33 #endif
  34
  35 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  36 struct kvm_stats_debugfs_item debugfs_entries[] = {
  37         { "wait", VCPU_STAT(wait_exits) },
  38         { "cache", VCPU_STAT(cache_exits) },
  39         { "signal", VCPU_STAT(signal_exits) },
  40         { "interrupt", VCPU_STAT(int_exits) },
  41         { "cop_unsuable", VCPU_STAT(cop_unusable_exits) },
  42         { "tlbmod", VCPU_STAT(tlbmod_exits) },
  43         { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits) },
  44         { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits) },
  45         { "addrerr_st", VCPU_STAT(addrerr_st_exits) },
  46         { "addrerr_ld", VCPU_STAT(addrerr_ld_exits) },
  47         { "syscall", VCPU_STAT(syscall_exits) },
  48         { "resvd_inst", VCPU_STAT(resvd_inst_exits) },
  49         { "break_inst", VCPU_STAT(break_inst_exits) },
  50         { "flush_dcache", VCPU_STAT(flush_dcache_exits) },
  51         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  52         {NULL}
  53 };
  54
  55 static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
  56 {
  57         int i;
  58         for_each_possible_cpu(i) {
  59                 vcpu->arch.guest_kernel_asid[i] = 0;
  60                 vcpu->arch.guest_user_asid[i] = 0;
  61         }
  62         return 0;
  63 }
  64
  65 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  66 {
  67         return gfn;
  68 }
  69
  70 /* XXXKYMA: We are simulatoring a processor that has the WII bit set in Config7, so we
  71  * are "runnable" if interrupts are pending
  72  */
  73 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
  74 {
  75         return !!(vcpu->arch.pending_exceptions);
  76 }
  77
  78 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  79 {
  80         return 1;
  81 }
  82
  83 int kvm_arch_hardware_enable(void *garbage)
  84 {
  85         return 0;
  86 }
  87
  88 void kvm_arch_hardware_disable(void *garbage)
  89 {
  90 }
  91
  92 int kvm_arch_hardware_setup(void)
  93 {
  94         return 0;
  95 }
  96
  97 void kvm_arch_hardware_unsetup(void)
  98 {
  99 }
 100
 101 void kvm_arch_check_processor_compat(void *rtn)
 102 {
 103         int *r = (int *)rtn;
 104         *r = 0;
 105         return;
 106 }
 107
 108 static void kvm_mips_init_tlbs(struct kvm *kvm)
 109 {
 110         unsigned long wired;
 111
 112         /* Add a wired entry to the TLB, it is used to map the commpage to the Guest kernel */
 113         wired = read_c0_wired();
 114         write_c0_wired(wired + 1);
 115         mtc0_tlbw_hazard();
 116         kvm->arch.commpage_tlb = wired;
 117
 118         kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
 119                   kvm->arch.commpage_tlb);
 120 }
 121
 122 static void kvm_mips_init_vm_percpu(void *arg)
 123 {
 124         struct kvm *kvm = (struct kvm *)arg;
 125
 126         kvm_mips_init_tlbs(kvm);
 127         kvm_mips_callbacks->vm_init(kvm);
 128
 129 }
 130
 131 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 132 {
 133         if (atomic_inc_return(&kvm_mips_instance) == 1) {
 134                 kvm_info("%s: 1st KVM instance, setup host TLB parameters\n",
 135                          __func__);
 136                 on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
 137         }
 138
 139
 140         return 0;
 141 }
 142
 143 void kvm_mips_free_vcpus(struct kvm *kvm)
 144 {
 145         unsigned int i;
 146         struct kvm_vcpu *vcpu;
 147
 148         /* Put the pages we reserved for the guest pmap */
 149         for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
 150                 if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
 151                         kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
 152         }
 153         kfree(kvm->arch.guest_pmap);
 154
 155         kvm_for_each_vcpu(i, vcpu, kvm) {
 156                 kvm_arch_vcpu_free(vcpu);
 157         }
 158
 159         mutex_lock(&kvm->lock);
 160
 161         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 162                 kvm->vcpus[i] = NULL;
 163
 164         atomic_set(&kvm->online_vcpus, 0);
 165
 166         mutex_unlock(&kvm->lock);
 167 }
 168
 169 void kvm_arch_sync_events(struct kvm *kvm)
 170 {
 171 }
 172
 173 static void kvm_mips_uninit_tlbs(void *arg)
 174 {
 175         /* Restore wired count */
 176         write_c0_wired(0);
 177         mtc0_tlbw_hazard();
 178         /* Clear out all the TLBs */
 179         kvm_local_flush_tlb_all();
 180 }
 181
 182 void kvm_arch_destroy_vm(struct kvm *kvm)
 183 {
 184         kvm_mips_free_vcpus(kvm);
 185
 186         /* If this is the last instance, restore wired count */
 187         if (atomic_dec_return(&kvm_mips_instance) == 0) {
 188                 kvm_info("%s: last KVM instance, restoring TLB parameters\n",
 189                          __func__);
 190                 on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
 191         }
 192 }
 193
 194 long
 195 kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 196 {
 197         return -ENOIOCTLCMD;
 198 }
 199
 200 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
 201                            struct kvm_memory_slot *dont)
 202 {
 203 }
 204
 205 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
 206                             unsigned long npages)
 207 {
 208         return 0;
 209 }
 210
 211 void kvm_arch_memslots_updated(struct kvm *kvm)
 212 {
 213 }
 214
 215 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 216                                 struct kvm_memory_slot *memslot,
 217                                 struct kvm_userspace_memory_region *mem,
 218                                 enum kvm_mr_change change)
 219 {
 220         return 0;
 221 }
 222
 223 void kvm_arch_commit_memory_region(struct kvm *kvm,
 224                                 struct kvm_userspace_memory_region *mem,
 225                                 const struct kvm_memory_slot *old,
 226                                 enum kvm_mr_change change)
 227 {
 228         unsigned long npages = 0;
 229         int i, err = 0;
 230
 231         kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
 232                   __func__, kvm, mem->slot, mem->guest_phys_addr,
 233                   mem->memory_size, mem->userspace_addr);
 234
 235         /* Setup Guest PMAP table */
 236         if (!kvm->arch.guest_pmap) {
 237                 if (mem->slot == 0)
 238                         npages = mem->memory_size >> PAGE_SHIFT;
 239
 240                 if (npages) {
 241                         kvm->arch.guest_pmap_npages = npages;
 242                         kvm->arch.guest_pmap =
 243                             kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
 244
 245                         if (!kvm->arch.guest_pmap) {
 246                                 kvm_err("Failed to allocate guest PMAP");
 247                                 err = -ENOMEM;
 248                                 goto out;
 249                         }
 250
 251                         kvm_info
 252                             ("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
 253                              npages, kvm->arch.guest_pmap);
 254
 255                         /* Now setup the page table */
 256                         for (i = 0; i < npages; i++) {
 257                                 kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
 258                         }
 259                 }
 260         }
 261 out:
 262         return;
 263 }
 264
 265 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 266 {
 267 }
 268
 269 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 270                                    struct kvm_memory_slot *slot)
 271 {
 272 }
 273
 274 void kvm_arch_flush_shadow(struct kvm *kvm)
 275 {
 276 }
 277
 278 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 279 {
 280         extern char mips32_exception[], mips32_exceptionEnd[];
 281         extern char mips32_GuestException[], mips32_GuestExceptionEnd[];
 282         int err, size, offset;
 283         void *gebase;
 284         int i;
 285
 286         struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
 287
 288         if (!vcpu) {
 289                 err = -ENOMEM;
 290                 goto out;
 291         }
 292
 293         err = kvm_vcpu_init(vcpu, kvm, id);
 294
 295         if (err)
 296                 goto out_free_cpu;
 297
 298         kvm_info("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
 299
 300         /* Allocate space for host mode exception handlers that handle
 301          * guest mode exits
 302          */
 303         if (cpu_has_veic || cpu_has_vint) {
 304                 size = 0x200 + VECTORSPACING * 64;
 305         } else {
 306                 size = 0x4000;
 307         }
 308
 309         /* Save Linux EBASE */
 310         vcpu->arch.host_ebase = (void *)read_c0_ebase();
 311
 312         gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
 313
 314         if (!gebase) {
 315                 err = -ENOMEM;
 316                 goto out_free_cpu;
 317         }
 318         kvm_info("Allocated %d bytes for KVM Exception Handlers @ %p\n",
 319                  ALIGN(size, PAGE_SIZE), gebase);
 320
 321         /* Save new ebase */
 322         vcpu->arch.guest_ebase = gebase;
 323
 324         /* Copy L1 Guest Exception handler to correct offset */
 325
 326         /* TLB Refill, EXL = 0 */
 327         memcpy(gebase, mips32_exception,
 328                mips32_exceptionEnd - mips32_exception);
 329
 330         /* General Exception Entry point */
 331         memcpy(gebase + 0x180, mips32_exception,
 332                mips32_exceptionEnd - mips32_exception);
 333
 334         /* For vectored interrupts poke the exception code @ all offsets 0-7 */
 335         for (i = 0; i < 8; i++) {
 336                 kvm_debug("L1 Vectored handler @ %p\n",
 337                           gebase + 0x200 + (i * VECTORSPACING));
 338                 memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
 339                        mips32_exceptionEnd - mips32_exception);
 340         }
 341
 342         /* General handler, relocate to unmapped space for sanity's sake */
 343         offset = 0x2000;
 344         kvm_info("Installing KVM Exception handlers @ %p, %#x bytes\n",
 345                  gebase + offset,
 346                  mips32_GuestExceptionEnd - mips32_GuestException);
 347
 348         memcpy(gebase + offset, mips32_GuestException,
 349                mips32_GuestExceptionEnd - mips32_GuestException);
 350
 351         /* Invalidate the icache for these ranges */
 352         mips32_SyncICache((unsigned long) gebase, ALIGN(size, PAGE_SIZE));
 353
 354         /* Allocate comm page for guest kernel, a TLB will be reserved for mapping GVA @ 0xFFFF8000 to this page */
 355         vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
 356
 357         if (!vcpu->arch.kseg0_commpage) {
 358                 err = -ENOMEM;
 359                 goto out_free_gebase;
 360         }
 361
 362         kvm_info("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
 363         kvm_mips_commpage_init(vcpu);
 364
 365         /* Init */
 366         vcpu->arch.last_sched_cpu = -1;
 367
 368         /* Start off the timer */
 369         kvm_mips_emulate_count(vcpu);
 370
 371         return vcpu;
 372
 373 out_free_gebase:
 374         kfree(gebase);
 375
 376 out_free_cpu:
 377         kfree(vcpu);
 378
 379 out:
 380         return ERR_PTR(err);
 381 }
 382
 383 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 384 {
 385         hrtimer_cancel(&vcpu->arch.comparecount_timer);
 386
 387         kvm_vcpu_uninit(vcpu);
 388
 389         kvm_mips_dump_stats(vcpu);
 390
 391         kfree(vcpu->arch.guest_ebase);
 392         kfree(vcpu->arch.kseg0_commpage);
 393         kfree(vcpu);
 394 }
 395
 396 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 397 {
 398         kvm_arch_vcpu_free(vcpu);
 399 }
 400
 401 int
 402 kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 403                                     struct kvm_guest_debug *dbg)
 404 {
 405         return -ENOIOCTLCMD;
 406 }
 407
 408 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 409 {
 410         int r = 0;
 411         sigset_t sigsaved;
 412
 413         if (vcpu->sigset_active)
 414                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 415
 416         if (vcpu->mmio_needed) {
 417                 if (!vcpu->mmio_is_write)
 418                         kvm_mips_complete_mmio_load(vcpu, run);
 419                 vcpu->mmio_needed = 0;
 420         }
 421
 422         lose_fpu(1);
 423
 424         local_irq_disable();
 425         /* Check if we have any exceptions/interrupts pending */
 426         kvm_mips_deliver_interrupts(vcpu,
 427                                     kvm_read_c0_guest_cause(vcpu->arch.cop0));
 428
 429         kvm_guest_enter();
 430
 431         r = __kvm_mips_vcpu_run(run, vcpu);
 432
 433         kvm_guest_exit();
 434         local_irq_enable();
 435
 436         if (vcpu->sigset_active)
 437                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 438
 439         return r;
 440 }
 441
 442 int
 443 kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
 444 {
 445         int intr = (int)irq->irq;
 446         struct kvm_vcpu *dvcpu = NULL;
 447
 448         if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
 449                 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
 450                           (int)intr);
 451
 452         if (irq->cpu == -1)
 453                 dvcpu = vcpu;
 454         else
 455                 dvcpu = vcpu->kvm->vcpus[irq->cpu];
 456
 457         if (intr == 2 || intr == 3 || intr == 4) {
 458                 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
 459
 460         } else if (intr == -2 || intr == -3 || intr == -4) {
 461                 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
 462         } else {
 463                 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
 464                         irq->cpu, irq->irq);
 465                 return -EINVAL;
 466         }
 467
 468         dvcpu->arch.wait = 0;
 469
 470         if (waitqueue_active(&dvcpu->wq)) {
 471                 wake_up_interruptible(&dvcpu->wq);
 472         }
 473
 474         return 0;
 475 }
 476
 477 int
 478 kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 479                                 struct kvm_mp_state *mp_state)
 480 {
 481         return -ENOIOCTLCMD;
 482 }
 483
 484 int
 485 kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 486                                 struct kvm_mp_state *mp_state)
 487 {
 488         return -ENOIOCTLCMD;
 489 }
 490
 491 #define MIPS_CP0_32(_R, _S)                                     \
 492         (KVM_REG_MIPS | KVM_REG_SIZE_U32 | 0x10000 | (8 * (_R) + (_S)))
 493
 494 #define MIPS_CP0_64(_R, _S)                                     \
 495         (KVM_REG_MIPS | KVM_REG_SIZE_U64 | 0x10000 | (8 * (_R) + (_S)))
 496
 497 #define KVM_REG_MIPS_CP0_INDEX          MIPS_CP0_32(0, 0)
 498 #define KVM_REG_MIPS_CP0_ENTRYLO0       MIPS_CP0_64(2, 0)
 499 #define KVM_REG_MIPS_CP0_ENTRYLO1       MIPS_CP0_64(3, 0)
 500 #define KVM_REG_MIPS_CP0_CONTEXT        MIPS_CP0_64(4, 0)
 501 #define KVM_REG_MIPS_CP0_USERLOCAL      MIPS_CP0_64(4, 2)
 502 #define KVM_REG_MIPS_CP0_PAGEMASK       MIPS_CP0_32(5, 0)
 503 #define KVM_REG_MIPS_CP0_PAGEGRAIN      MIPS_CP0_32(5, 1)
 504 #define KVM_REG_MIPS_CP0_WIRED          MIPS_CP0_32(6, 0)
 505 #define KVM_REG_MIPS_CP0_HWRENA         MIPS_CP0_32(7, 0)
 506 #define KVM_REG_MIPS_CP0_BADVADDR       MIPS_CP0_64(8, 0)
 507 #define KVM_REG_MIPS_CP0_COUNT          MIPS_CP0_32(9, 0)
 508 #define KVM_REG_MIPS_CP0_ENTRYHI        MIPS_CP0_64(10, 0)
 509 #define KVM_REG_MIPS_CP0_COMPARE        MIPS_CP0_32(11, 0)
 510 #define KVM_REG_MIPS_CP0_STATUS         MIPS_CP0_32(12, 0)
 511 #define KVM_REG_MIPS_CP0_CAUSE          MIPS_CP0_32(13, 0)
 512 #define KVM_REG_MIPS_CP0_EBASE          MIPS_CP0_64(15, 1)
 513 #define KVM_REG_MIPS_CP0_CONFIG         MIPS_CP0_32(16, 0)
 514 #define KVM_REG_MIPS_CP0_CONFIG1        MIPS_CP0_32(16, 1)
 515 #define KVM_REG_MIPS_CP0_CONFIG2        MIPS_CP0_32(16, 2)
 516 #define KVM_REG_MIPS_CP0_CONFIG3        MIPS_CP0_32(16, 3)
 517 #define KVM_REG_MIPS_CP0_CONFIG7        MIPS_CP0_32(16, 7)
 518 #define KVM_REG_MIPS_CP0_XCONTEXT       MIPS_CP0_64(20, 0)
 519 #define KVM_REG_MIPS_CP0_ERROREPC       MIPS_CP0_64(30, 0)
 520
 521 static u64 kvm_mips_get_one_regs[] = {
 522         KVM_REG_MIPS_R0,
 523         KVM_REG_MIPS_R1,
 524         KVM_REG_MIPS_R2,
 525         KVM_REG_MIPS_R3,
 526         KVM_REG_MIPS_R4,
 527         KVM_REG_MIPS_R5,
 528         KVM_REG_MIPS_R6,
 529         KVM_REG_MIPS_R7,
 530         KVM_REG_MIPS_R8,
 531         KVM_REG_MIPS_R9,
 532         KVM_REG_MIPS_R10,
 533         KVM_REG_MIPS_R11,
 534         KVM_REG_MIPS_R12,
 535         KVM_REG_MIPS_R13,
 536         KVM_REG_MIPS_R14,
 537         KVM_REG_MIPS_R15,
 538         KVM_REG_MIPS_R16,
 539         KVM_REG_MIPS_R17,
 540         KVM_REG_MIPS_R18,
 541         KVM_REG_MIPS_R19,
 542         KVM_REG_MIPS_R20,
 543         KVM_REG_MIPS_R21,
 544         KVM_REG_MIPS_R22,
 545         KVM_REG_MIPS_R23,
 546         KVM_REG_MIPS_R24,
 547         KVM_REG_MIPS_R25,
 548         KVM_REG_MIPS_R26,
 549         KVM_REG_MIPS_R27,
 550         KVM_REG_MIPS_R28,
 551         KVM_REG_MIPS_R29,
 552         KVM_REG_MIPS_R30,
 553         KVM_REG_MIPS_R31,
 554
 555         KVM_REG_MIPS_HI,
 556         KVM_REG_MIPS_LO,
 557         KVM_REG_MIPS_PC,
 558
 559         KVM_REG_MIPS_CP0_INDEX,
 560         KVM_REG_MIPS_CP0_CONTEXT,
 561         KVM_REG_MIPS_CP0_PAGEMASK,
 562         KVM_REG_MIPS_CP0_WIRED,
 563         KVM_REG_MIPS_CP0_BADVADDR,
 564         KVM_REG_MIPS_CP0_ENTRYHI,
 565         KVM_REG_MIPS_CP0_STATUS,
 566         KVM_REG_MIPS_CP0_CAUSE,
 567         /* EPC set via kvm_regs, et al. */
 568         KVM_REG_MIPS_CP0_CONFIG,
 569         KVM_REG_MIPS_CP0_CONFIG1,
 570         KVM_REG_MIPS_CP0_CONFIG2,
 571         KVM_REG_MIPS_CP0_CONFIG3,
 572         KVM_REG_MIPS_CP0_CONFIG7,
 573         KVM_REG_MIPS_CP0_ERROREPC
 574 };
 575
 576 static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
 577                             const struct kvm_one_reg *reg)
 578 {
 579         struct mips_coproc *cop0 = vcpu->arch.cop0;
 580         s64 v;
 581
 582         switch (reg->id) {
 583         case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
 584                 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
 585                 break;
 586         case KVM_REG_MIPS_HI:
 587                 v = (long)vcpu->arch.hi;
 588                 break;
 589         case KVM_REG_MIPS_LO:
 590                 v = (long)vcpu->arch.lo;
 591                 break;
 592         case KVM_REG_MIPS_PC:
 593                 v = (long)vcpu->arch.pc;
 594                 break;
 595
 596         case KVM_REG_MIPS_CP0_INDEX:
 597                 v = (long)kvm_read_c0_guest_index(cop0);
 598                 break;
 599         case KVM_REG_MIPS_CP0_CONTEXT:
 600                 v = (long)kvm_read_c0_guest_context(cop0);
 601                 break;
 602         case KVM_REG_MIPS_CP0_PAGEMASK:
 603                 v = (long)kvm_read_c0_guest_pagemask(cop0);
 604                 break;
 605         case KVM_REG_MIPS_CP0_WIRED:
 606                 v = (long)kvm_read_c0_guest_wired(cop0);
 607                 break;
 608         case KVM_REG_MIPS_CP0_BADVADDR:
 609                 v = (long)kvm_read_c0_guest_badvaddr(cop0);
 610                 break;
 611         case KVM_REG_MIPS_CP0_ENTRYHI:
 612                 v = (long)kvm_read_c0_guest_entryhi(cop0);
 613                 break;
 614         case KVM_REG_MIPS_CP0_STATUS:
 615                 v = (long)kvm_read_c0_guest_status(cop0);
 616                 break;
 617         case KVM_REG_MIPS_CP0_CAUSE:
 618                 v = (long)kvm_read_c0_guest_cause(cop0);
 619                 break;
 620         case KVM_REG_MIPS_CP0_ERROREPC:
 621                 v = (long)kvm_read_c0_guest_errorepc(cop0);
 622                 break;
 623         case KVM_REG_MIPS_CP0_CONFIG:
 624                 v = (long)kvm_read_c0_guest_config(cop0);
 625                 break;
 626         case KVM_REG_MIPS_CP0_CONFIG1:
 627                 v = (long)kvm_read_c0_guest_config1(cop0);
 628                 break;
 629         case KVM_REG_MIPS_CP0_CONFIG2:
 630                 v = (long)kvm_read_c0_guest_config2(cop0);
 631                 break;
 632         case KVM_REG_MIPS_CP0_CONFIG3:
 633                 v = (long)kvm_read_c0_guest_config3(cop0);
 634                 break;
 635         case KVM_REG_MIPS_CP0_CONFIG7:
 636                 v = (long)kvm_read_c0_guest_config7(cop0);
 637                 break;
 638         default:
 639                 return -EINVAL;
 640         }
 641         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 642                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 643                 return put_user(v, uaddr64);
 644         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 645                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 646                 u32 v32 = (u32)v;
 647                 return put_user(v32, uaddr32);
 648         } else {
 649                 return -EINVAL;
 650         }
 651 }
 652
 653 static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
 654                             const struct kvm_one_reg *reg)
 655 {
 656         struct mips_coproc *cop0 = vcpu->arch.cop0;
 657         u64 v;
 658
 659         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 660                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 661
 662                 if (get_user(v, uaddr64) != 0)
 663                         return -EFAULT;
 664         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 665                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 666                 s32 v32;
 667
 668                 if (get_user(v32, uaddr32) != 0)
 669                         return -EFAULT;
 670                 v = (s64)v32;
 671         } else {
 672                 return -EINVAL;
 673         }
 674
 675         switch (reg->id) {
 676         case KVM_REG_MIPS_R0:
 677                 /* Silently ignore requests to set $0 */
 678                 break;
 679         case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
 680                 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
 681                 break;
 682         case KVM_REG_MIPS_HI:
 683                 vcpu->arch.hi = v;
 684                 break;
 685         case KVM_REG_MIPS_LO:
 686                 vcpu->arch.lo = v;
 687                 break;
 688         case KVM_REG_MIPS_PC:
 689                 vcpu->arch.pc = v;
 690                 break;
 691
 692         case KVM_REG_MIPS_CP0_INDEX:
 693                 kvm_write_c0_guest_index(cop0, v);
 694                 break;
 695         case KVM_REG_MIPS_CP0_CONTEXT:
 696                 kvm_write_c0_guest_context(cop0, v);
 697                 break;
 698         case KVM_REG_MIPS_CP0_PAGEMASK:
 699                 kvm_write_c0_guest_pagemask(cop0, v);
 700                 break;
 701         case KVM_REG_MIPS_CP0_WIRED:
 702                 kvm_write_c0_guest_wired(cop0, v);
 703                 break;
 704         case KVM_REG_MIPS_CP0_BADVADDR:
 705                 kvm_write_c0_guest_badvaddr(cop0, v);
 706                 break;
 707         case KVM_REG_MIPS_CP0_ENTRYHI:
 708                 kvm_write_c0_guest_entryhi(cop0, v);
 709                 break;
 710         case KVM_REG_MIPS_CP0_STATUS:
 711                 kvm_write_c0_guest_status(cop0, v);
 712                 break;
 713         case KVM_REG_MIPS_CP0_CAUSE:
 714                 kvm_write_c0_guest_cause(cop0, v);
 715                 break;
 716         case KVM_REG_MIPS_CP0_ERROREPC:
 717                 kvm_write_c0_guest_errorepc(cop0, v);
 718                 break;
 719         default:
 720                 return -EINVAL;
 721         }
 722         return 0;
 723 }
 724
 725 long
 726 kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 727 {
 728         struct kvm_vcpu *vcpu = filp->private_data;
 729         void __user *argp = (void __user *)arg;
 730         long r;
 731
 732         switch (ioctl) {
 733         case KVM_SET_ONE_REG:
 734         case KVM_GET_ONE_REG: {
 735                 struct kvm_one_reg reg;
 736                 if (copy_from_user(&reg, argp, sizeof(reg)))
 737                         return -EFAULT;
 738                 if (ioctl == KVM_SET_ONE_REG)
 739                         return kvm_mips_set_reg(vcpu, &reg);
 740                 else
 741                         return kvm_mips_get_reg(vcpu, &reg);
 742         }
 743         case KVM_GET_REG_LIST: {
 744                 struct kvm_reg_list __user *user_list = argp;
 745                 u64 __user *reg_dest;
 746                 struct kvm_reg_list reg_list;
 747                 unsigned n;
 748
 749                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 750                         return -EFAULT;
 751                 n = reg_list.n;
 752                 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
 753                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 754                         return -EFAULT;
 755                 if (n < reg_list.n)
 756                         return -E2BIG;
 757                 reg_dest = user_list->reg;
 758                 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
 759                                  sizeof(kvm_mips_get_one_regs)))
 760                         return -EFAULT;
 761                 return 0;
 762         }
 763         case KVM_NMI:
 764                 /* Treat the NMI as a CPU reset */
 765                 r = kvm_mips_reset_vcpu(vcpu);
 766                 break;
 767         case KVM_INTERRUPT:
 768                 {
 769                         struct kvm_mips_interrupt irq;
 770                         r = -EFAULT;
 771                         if (copy_from_user(&irq, argp, sizeof(irq)))
 772                                 goto out;
 773
 774                         kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
 775                                   irq.irq);
 776
 777                         r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 778                         break;
 779                 }
 780         default:
 781                 r = -ENOIOCTLCMD;
 782         }
 783
 784 out:
 785         return r;
 786 }
 787
 788 /*
 789  * Get (and clear) the dirty memory log for a memory slot.
 790  */
 791 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 792 {
 793         struct kvm_memory_slot *memslot;
 794         unsigned long ga, ga_end;
 795         int is_dirty = 0;
 796         int r;
 797         unsigned long n;
 798
 799         mutex_lock(&kvm->slots_lock);
 800
 801         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 802         if (r)
 803                 goto out;
 804
 805         /* If nothing is dirty, don't bother messing with page tables. */
 806         if (is_dirty) {
 807                 memslot = &kvm->memslots->memslots[log->slot];
 808
 809                 ga = memslot->base_gfn << PAGE_SHIFT;
 810                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
 811
 812                 printk("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
 813                        ga_end);
 814
 815                 n = kvm_dirty_bitmap_bytes(memslot);
 816                 memset(memslot->dirty_bitmap, 0, n);
 817         }
 818
 819         r = 0;
 820 out:
 821         mutex_unlock(&kvm->slots_lock);
 822         return r;
 823
 824 }
 825
 826 long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 827 {
 828         long r;
 829
 830         switch (ioctl) {
 831         default:
 832                 r = -ENOIOCTLCMD;
 833         }
 834
 835         return r;
 836 }
 837
 838 int kvm_arch_init(void *opaque)
 839 {
 840         int ret;
 841
 842         if (kvm_mips_callbacks) {
 843                 kvm_err("kvm: module already exists\n");
 844                 return -EEXIST;
 845         }
 846
 847         ret = kvm_mips_emulation_init(&kvm_mips_callbacks);
 848
 849         return ret;
 850 }
 851
 852 void kvm_arch_exit(void)
 853 {
 854         kvm_mips_callbacks = NULL;
 855 }
 856
 857 int
 858 kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 859 {
 860         return -ENOIOCTLCMD;
 861 }
 862
 863 int
 864 kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 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_dev_ioctl_check_extension(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         printk("VCPU Register Dump:\n");
 921         printk("\tpc = 0x%08lx\n", vcpu->arch.pc);;
 922         printk("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
 923
 924         for (i = 0; i < 32; i += 4) {
 925                 printk("\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         printk("\thi: 0x%08lx\n", vcpu->arch.hi);
 931         printk("\tlo: 0x%08lx\n", vcpu->arch.lo);
 932
 933         cop0 = vcpu->arch.cop0;
 934         printk("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
 935                kvm_read_c0_guest_status(cop0), kvm_read_c0_guest_cause(cop0));
 936
 937         printk("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
 938
 939         return 0;
 940 }
 941
 942 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 943 {
 944         int i;
 945
 946         for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 947                 vcpu->arch.gprs[i] = regs->gpr[i];
 948         vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
 949         vcpu->arch.hi = regs->hi;
 950         vcpu->arch.lo = regs->lo;
 951         vcpu->arch.pc = regs->pc;
 952
 953         return 0;
 954 }
 955
 956 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 957 {
 958         int i;
 959
 960         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 961                 regs->gpr[i] = vcpu->arch.gprs[i];
 962
 963         regs->hi = vcpu->arch.hi;
 964         regs->lo = vcpu->arch.lo;
 965         regs->pc = vcpu->arch.pc;
 966
 967         return 0;
 968 }
 969
 970 void kvm_mips_comparecount_func(unsigned long data)
 971 {
 972         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 973
 974         kvm_mips_callbacks->queue_timer_int(vcpu);
 975
 976         vcpu->arch.wait = 0;
 977         if (waitqueue_active(&vcpu->wq)) {
 978                 wake_up_interruptible(&vcpu->wq);
 979         }
 980 }
 981
 982 /*
 983  * low level hrtimer wake routine.
 984  */
 985 enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
 986 {
 987         struct kvm_vcpu *vcpu;
 988
 989         vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
 990         kvm_mips_comparecount_func((unsigned long) vcpu);
 991         hrtimer_forward_now(&vcpu->arch.comparecount_timer,
 992                             ktime_set(0, MS_TO_NS(10)));
 993         return HRTIMER_RESTART;
 994 }
 995
 996 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 997 {
 998         kvm_mips_callbacks->vcpu_init(vcpu);
 999         hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
1000                      HRTIMER_MODE_REL);
1001         vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
1002         kvm_mips_init_shadow_tlb(vcpu);
1003         return 0;
1004 }
1005
1006 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
1007 {
1008         return;
1009 }
1010
1011 int
1012 kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr)
1013 {
1014         return 0;
1015 }
1016
1017 /* Initial guest state */
1018 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1019 {
1020         return kvm_mips_callbacks->vcpu_setup(vcpu);
1021 }
1022
1023 static
1024 void kvm_mips_set_c0_status(void)
1025 {
1026         uint32_t status = read_c0_status();
1027
1028         if (cpu_has_dsp)
1029                 status |= (ST0_MX);
1030
1031         write_c0_status(status);
1032         ehb();
1033 }
1034
1035 /*
1036  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
1037  */
1038 int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1039 {
1040         uint32_t cause = vcpu->arch.host_cp0_cause;
1041         uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
1042         uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
1043         unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
1044         enum emulation_result er = EMULATE_DONE;
1045         int ret = RESUME_GUEST;
1046
1047         /* Set a default exit reason */
1048         run->exit_reason = KVM_EXIT_UNKNOWN;
1049         run->ready_for_interrupt_injection = 1;
1050
1051         /* Set the appropriate status bits based on host CPU features, before we hit the scheduler */
1052         kvm_mips_set_c0_status();
1053
1054         local_irq_enable();
1055
1056         kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
1057                         cause, opc, run, vcpu);
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
1082                 ret = RESUME_GUEST;
1083                 break;
1084
1085         case T_COP_UNUSABLE:
1086                 kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
1087
1088                 ++vcpu->stat.cop_unusable_exits;
1089                 trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
1090                 ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
1091                 /* XXXKYMA: Might need to return to user space */
1092                 if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) {
1093                         ret = RESUME_HOST;
1094                 }
1095                 break;
1096
1097         case T_TLB_MOD:
1098                 ++vcpu->stat.tlbmod_exits;
1099                 trace_kvm_exit(vcpu, TLBMOD_EXITS);
1100                 ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
1101                 break;
1102
1103         case T_TLB_ST_MISS:
1104                 kvm_debug
1105                     ("TLB ST fault:  cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
1106                      cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
1107                      badvaddr);
1108
1109                 ++vcpu->stat.tlbmiss_st_exits;
1110                 trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
1111                 ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
1112                 break;
1113
1114         case T_TLB_LD_MISS:
1115                 kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
1116                           cause, opc, badvaddr);
1117
1118                 ++vcpu->stat.tlbmiss_ld_exits;
1119                 trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
1120                 ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
1121                 break;
1122
1123         case T_ADDR_ERR_ST:
1124                 ++vcpu->stat.addrerr_st_exits;
1125                 trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
1126                 ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
1127                 break;
1128
1129         case T_ADDR_ERR_LD:
1130                 ++vcpu->stat.addrerr_ld_exits;
1131                 trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
1132                 ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
1133                 break;
1134
1135         case T_SYSCALL:
1136                 ++vcpu->stat.syscall_exits;
1137                 trace_kvm_exit(vcpu, SYSCALL_EXITS);
1138                 ret = kvm_mips_callbacks->handle_syscall(vcpu);
1139                 break;
1140
1141         case T_RES_INST:
1142                 ++vcpu->stat.resvd_inst_exits;
1143                 trace_kvm_exit(vcpu, RESVD_INST_EXITS);
1144                 ret = kvm_mips_callbacks->handle_res_inst(vcpu);
1145                 break;
1146
1147         case T_BREAK:
1148                 ++vcpu->stat.break_inst_exits;
1149                 trace_kvm_exit(vcpu, BREAK_INST_EXITS);
1150                 ret = kvm_mips_callbacks->handle_break(vcpu);
1151                 break;
1152
1153         default:
1154                 kvm_err
1155                     ("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x  BadVaddr: %#lx Status: %#lx\n",
1156                      exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
1157                      kvm_read_c0_guest_status(vcpu->arch.cop0));
1158                 kvm_arch_vcpu_dump_regs(vcpu);
1159                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1160                 ret = RESUME_HOST;
1161                 break;
1162
1163         }
1164
1165 skip_emul:
1166         local_irq_disable();
1167
1168         if (er == EMULATE_DONE && !(ret & RESUME_HOST))
1169                 kvm_mips_deliver_interrupts(vcpu, cause);
1170
1171         if (!(ret & RESUME_HOST)) {
1172                 /* Only check for signals if not already exiting to userspace  */
1173                 if (signal_pending(current)) {
1174                         run->exit_reason = KVM_EXIT_INTR;
1175                         ret = (-EINTR << 2) | RESUME_HOST;
1176                         ++vcpu->stat.signal_exits;
1177                         trace_kvm_exit(vcpu, SIGNAL_EXITS);
1178                 }
1179         }
1180
1181         return ret;
1182 }
1183
1184 int __init kvm_mips_init(void)
1185 {
1186         int ret;
1187
1188         ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1189
1190         if (ret)
1191                 return ret;
1192
1193         /* On MIPS, kernel modules are executed from "mapped space", which requires TLBs.
1194          * The TLB handling code is statically linked with the rest of the kernel (kvm_tlb.c)
1195          * to avoid the possibility of double faulting. The issue is that the TLB code
1196          * references routines that are part of the the KVM module,
1197          * which are only available once the module is loaded.
1198          */
1199         kvm_mips_gfn_to_pfn = gfn_to_pfn;
1200         kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
1201         kvm_mips_is_error_pfn = is_error_pfn;
1202
1203         pr_info("KVM/MIPS Initialized\n");
1204         return 0;
1205 }
1206
1207 void __exit kvm_mips_exit(void)
1208 {
1209         kvm_exit();
1210
1211         kvm_mips_gfn_to_pfn = NULL;
1212         kvm_mips_release_pfn_clean = NULL;
1213         kvm_mips_is_error_pfn = NULL;
1214
1215         pr_info("KVM/MIPS unloaded\n");
1216 }
1217
1218 module_init(kvm_mips_init);
1219 module_exit(kvm_mips_exit);
1220
1221 EXPORT_TRACEPOINT_SYMBOL(kvm_exit);