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 <[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 "kvm_mips_int.h"
  25 #include "kvm_mips_comm.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), KVM_STAT_VCPU
  35 struct kvm_stats_debugfs_item debugfs_entries[] = {
  36         { "wait", VCPU_STAT(wait_exits) },
  37         { "cache", VCPU_STAT(cache_exits) },
  38         { "signal", VCPU_STAT(signal_exits) },
  39         { "interrupt", VCPU_STAT(int_exits) },
  40         { "cop_unsuable", VCPU_STAT(cop_unusable_exits) },
  41         { "tlbmod", VCPU_STAT(tlbmod_exits) },
  42         { "tlbmiss_ld", VCPU_STAT(tlbmiss_ld_exits) },
  43         { "tlbmiss_st", VCPU_STAT(tlbmiss_st_exits) },
  44         { "addrerr_st", VCPU_STAT(addrerr_st_exits) },
  45         { "addrerr_ld", VCPU_STAT(addrerr_ld_exits) },
  46         { "syscall", VCPU_STAT(syscall_exits) },
  47         { "resvd_inst", VCPU_STAT(resvd_inst_exits) },
  48         { "break_inst", VCPU_STAT(break_inst_exits) },
  49         { "flush_dcache", VCPU_STAT(flush_dcache_exits) },
  50         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  51         {NULL}
  52 };
  53
  54 static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
  55 {
  56         int i;
  57         for_each_possible_cpu(i) {
  58                 vcpu->arch.guest_kernel_asid[i] = 0;
  59                 vcpu->arch.guest_user_asid[i] = 0;
  60         }
  61         return 0;
  62 }
  63
  64 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
  65 {
  66         return gfn;
  67 }
  68
  69 /* XXXKYMA: We are simulatoring a processor that has the WII bit set in Config7, so we
  70  * are "runnable" if interrupts are pending
  71  */
  72 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
  73 {
  74         return !!(vcpu->arch.pending_exceptions);
  75 }
  76
  77 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  78 {
  79         return 1;
  80 }
  81
  82 int kvm_arch_hardware_enable(void *garbage)
  83 {
  84         return 0;
  85 }
  86
  87 void kvm_arch_hardware_disable(void *garbage)
  88 {
  89 }
  90
  91 int kvm_arch_hardware_setup(void)
  92 {
  93         return 0;
  94 }
  95
  96 void kvm_arch_hardware_unsetup(void)
  97 {
  98 }
  99
 100 void kvm_arch_check_processor_compat(void *rtn)
 101 {
 102         int *r = (int *)rtn;
 103         *r = 0;
 104         return;
 105 }
 106
 107 static void kvm_mips_init_tlbs(struct kvm *kvm)
 108 {
 109         unsigned long wired;
 110
 111         /* Add a wired entry to the TLB, it is used to map the commpage to the Guest kernel */
 112         wired = read_c0_wired();
 113         write_c0_wired(wired + 1);
 114         mtc0_tlbw_hazard();
 115         kvm->arch.commpage_tlb = wired;
 116
 117         kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
 118                   kvm->arch.commpage_tlb);
 119 }
 120
 121 static void kvm_mips_init_vm_percpu(void *arg)
 122 {
 123         struct kvm *kvm = (struct kvm *)arg;
 124
 125         kvm_mips_init_tlbs(kvm);
 126         kvm_mips_callbacks->vm_init(kvm);
 127
 128 }
 129
 130 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 131 {
 132         if (atomic_inc_return(&kvm_mips_instance) == 1) {
 133                 kvm_info("%s: 1st KVM instance, setup host TLB parameters\n",
 134                          __func__);
 135                 on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
 136         }
 137
 138
 139         return 0;
 140 }
 141
 142 void kvm_mips_free_vcpus(struct kvm *kvm)
 143 {
 144         unsigned int i;
 145         struct kvm_vcpu *vcpu;
 146
 147         /* Put the pages we reserved for the guest pmap */
 148         for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
 149                 if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
 150                         kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
 151         }
 152
 153         if (kvm->arch.guest_pmap)
 154                 kfree(kvm->arch.guest_pmap);
 155
 156         kvm_for_each_vcpu(i, vcpu, kvm) {
 157                 kvm_arch_vcpu_free(vcpu);
 158         }
 159
 160         mutex_lock(&kvm->lock);
 161
 162         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 163                 kvm->vcpus[i] = NULL;
 164
 165         atomic_set(&kvm->online_vcpus, 0);
 166
 167         mutex_unlock(&kvm->lock);
 168 }
 169
 170 void kvm_arch_sync_events(struct kvm *kvm)
 171 {
 172 }
 173
 174 static void kvm_mips_uninit_tlbs(void *arg)
 175 {
 176         /* Restore wired count */
 177         write_c0_wired(0);
 178         mtc0_tlbw_hazard();
 179         /* Clear out all the TLBs */
 180         kvm_local_flush_tlb_all();
 181 }
 182
 183 void kvm_arch_destroy_vm(struct kvm *kvm)
 184 {
 185         kvm_mips_free_vcpus(kvm);
 186
 187         /* If this is the last instance, restore wired count */
 188         if (atomic_dec_return(&kvm_mips_instance) == 0) {
 189                 kvm_info("%s: last KVM instance, restoring TLB parameters\n",
 190                          __func__);
 191                 on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
 192         }
 193 }
 194
 195 long
 196 kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 197 {
 198         return -ENOIOCTLCMD;
 199 }
 200
 201 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 202                            struct kvm_memory_slot *dont)
 203 {
 204 }
 205
 206 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, 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 = 0x200;
 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         if (vcpu->arch.guest_ebase)
 392                 kfree(vcpu->arch.guest_ebase);
 393
 394         if (vcpu->arch.kseg0_commpage)
 395                 kfree(vcpu->arch.kseg0_commpage);
 396
 397 }
 398
 399 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 400 {
 401         kvm_arch_vcpu_free(vcpu);
 402 }
 403
 404 int
 405 kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 406                                     struct kvm_guest_debug *dbg)
 407 {
 408         return -ENOIOCTLCMD;
 409 }
 410
 411 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 412 {
 413         int r = 0;
 414         sigset_t sigsaved;
 415
 416         if (vcpu->sigset_active)
 417                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 418
 419         if (vcpu->mmio_needed) {
 420                 if (!vcpu->mmio_is_write)
 421                         kvm_mips_complete_mmio_load(vcpu, run);
 422                 vcpu->mmio_needed = 0;
 423         }
 424
 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         local_irq_disable();
 430         kvm_guest_enter();
 431
 432         r = __kvm_mips_vcpu_run(run, vcpu);
 433
 434         kvm_guest_exit();
 435         local_irq_enable();
 436
 437         if (vcpu->sigset_active)
 438                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 439
 440         return r;
 441 }
 442
 443 int
 444 kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
 445 {
 446         int intr = (int)irq->irq;
 447         struct kvm_vcpu *dvcpu = NULL;
 448
 449         if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
 450                 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
 451                           (int)intr);
 452
 453         if (irq->cpu == -1)
 454                 dvcpu = vcpu;
 455         else
 456                 dvcpu = vcpu->kvm->vcpus[irq->cpu];
 457
 458         if (intr == 2 || intr == 3 || intr == 4) {
 459                 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
 460
 461         } else if (intr == -2 || intr == -3 || intr == -4) {
 462                 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
 463         } else {
 464                 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
 465                         irq->cpu, irq->irq);
 466                 return -EINVAL;
 467         }
 468
 469         dvcpu->arch.wait = 0;
 470
 471         if (waitqueue_active(&dvcpu->wq)) {
 472                 wake_up_interruptible(&dvcpu->wq);
 473         }
 474
 475         return 0;
 476 }
 477
 478 int
 479 kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 480                                 struct kvm_mp_state *mp_state)
 481 {
 482         return -ENOIOCTLCMD;
 483 }
 484
 485 int
 486 kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 487                                 struct kvm_mp_state *mp_state)
 488 {
 489         return -ENOIOCTLCMD;
 490 }
 491
 492 #define MIPS_CP0_32(_R, _S)                                     \
 493         (KVM_REG_MIPS | KVM_REG_SIZE_U32 | 0x10000 | (8 * (_R) + (_S)))
 494
 495 #define MIPS_CP0_64(_R, _S)                                     \
 496         (KVM_REG_MIPS | KVM_REG_SIZE_U64 | 0x10000 | (8 * (_R) + (_S)))
 497
 498 #define KVM_REG_MIPS_CP0_INDEX          MIPS_CP0_32(0, 0)
 499 #define KVM_REG_MIPS_CP0_ENTRYLO0       MIPS_CP0_64(2, 0)
 500 #define KVM_REG_MIPS_CP0_ENTRYLO1       MIPS_CP0_64(3, 0)
 501 #define KVM_REG_MIPS_CP0_CONTEXT        MIPS_CP0_64(4, 0)
 502 #define KVM_REG_MIPS_CP0_USERLOCAL      MIPS_CP0_64(4, 2)
 503 #define KVM_REG_MIPS_CP0_PAGEMASK       MIPS_CP0_32(5, 0)
 504 #define KVM_REG_MIPS_CP0_PAGEGRAIN      MIPS_CP0_32(5, 1)
 505 #define KVM_REG_MIPS_CP0_WIRED          MIPS_CP0_32(6, 0)
 506 #define KVM_REG_MIPS_CP0_HWRENA         MIPS_CP0_32(7, 0)
 507 #define KVM_REG_MIPS_CP0_BADVADDR       MIPS_CP0_64(8, 0)
 508 #define KVM_REG_MIPS_CP0_COUNT          MIPS_CP0_32(9, 0)
 509 #define KVM_REG_MIPS_CP0_ENTRYHI        MIPS_CP0_64(10, 0)
 510 #define KVM_REG_MIPS_CP0_COMPARE        MIPS_CP0_32(11, 0)
 511 #define KVM_REG_MIPS_CP0_STATUS         MIPS_CP0_32(12, 0)
 512 #define KVM_REG_MIPS_CP0_CAUSE          MIPS_CP0_32(13, 0)
 513 #define KVM_REG_MIPS_CP0_EBASE          MIPS_CP0_64(15, 1)
 514 #define KVM_REG_MIPS_CP0_CONFIG         MIPS_CP0_32(16, 0)
 515 #define KVM_REG_MIPS_CP0_CONFIG1        MIPS_CP0_32(16, 1)
 516 #define KVM_REG_MIPS_CP0_CONFIG2        MIPS_CP0_32(16, 2)
 517 #define KVM_REG_MIPS_CP0_CONFIG3        MIPS_CP0_32(16, 3)
 518 #define KVM_REG_MIPS_CP0_CONFIG7        MIPS_CP0_32(16, 7)
 519 #define KVM_REG_MIPS_CP0_XCONTEXT       MIPS_CP0_64(20, 0)
 520 #define KVM_REG_MIPS_CP0_ERROREPC       MIPS_CP0_64(30, 0)
 521
 522 static u64 kvm_mips_get_one_regs[] = {
 523         KVM_REG_MIPS_R0,
 524         KVM_REG_MIPS_R1,
 525         KVM_REG_MIPS_R2,
 526         KVM_REG_MIPS_R3,
 527         KVM_REG_MIPS_R4,
 528         KVM_REG_MIPS_R5,
 529         KVM_REG_MIPS_R6,
 530         KVM_REG_MIPS_R7,
 531         KVM_REG_MIPS_R8,
 532         KVM_REG_MIPS_R9,
 533         KVM_REG_MIPS_R10,
 534         KVM_REG_MIPS_R11,
 535         KVM_REG_MIPS_R12,
 536         KVM_REG_MIPS_R13,
 537         KVM_REG_MIPS_R14,
 538         KVM_REG_MIPS_R15,
 539         KVM_REG_MIPS_R16,
 540         KVM_REG_MIPS_R17,
 541         KVM_REG_MIPS_R18,
 542         KVM_REG_MIPS_R19,
 543         KVM_REG_MIPS_R20,
 544         KVM_REG_MIPS_R21,
 545         KVM_REG_MIPS_R22,
 546         KVM_REG_MIPS_R23,
 547         KVM_REG_MIPS_R24,
 548         KVM_REG_MIPS_R25,
 549         KVM_REG_MIPS_R26,
 550         KVM_REG_MIPS_R27,
 551         KVM_REG_MIPS_R28,
 552         KVM_REG_MIPS_R29,
 553         KVM_REG_MIPS_R30,
 554         KVM_REG_MIPS_R31,
 555
 556         KVM_REG_MIPS_HI,
 557         KVM_REG_MIPS_LO,
 558         KVM_REG_MIPS_PC,
 559
 560         KVM_REG_MIPS_CP0_INDEX,
 561         KVM_REG_MIPS_CP0_CONTEXT,
 562         KVM_REG_MIPS_CP0_PAGEMASK,
 563         KVM_REG_MIPS_CP0_WIRED,
 564         KVM_REG_MIPS_CP0_BADVADDR,
 565         KVM_REG_MIPS_CP0_ENTRYHI,
 566         KVM_REG_MIPS_CP0_STATUS,
 567         KVM_REG_MIPS_CP0_CAUSE,
 568         /* EPC set via kvm_regs, et al. */
 569         KVM_REG_MIPS_CP0_CONFIG,
 570         KVM_REG_MIPS_CP0_CONFIG1,
 571         KVM_REG_MIPS_CP0_CONFIG2,
 572         KVM_REG_MIPS_CP0_CONFIG3,
 573         KVM_REG_MIPS_CP0_CONFIG7,
 574         KVM_REG_MIPS_CP0_ERROREPC
 575 };
 576
 577 static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
 578                             const struct kvm_one_reg *reg)
 579 {
 580         struct mips_coproc *cop0 = vcpu->arch.cop0;
 581         s64 v;
 582
 583         switch (reg->id) {
 584         case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
 585                 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
 586                 break;
 587         case KVM_REG_MIPS_HI:
 588                 v = (long)vcpu->arch.hi;
 589                 break;
 590         case KVM_REG_MIPS_LO:
 591                 v = (long)vcpu->arch.lo;
 592                 break;
 593         case KVM_REG_MIPS_PC:
 594                 v = (long)vcpu->arch.pc;
 595                 break;
 596
 597         case KVM_REG_MIPS_CP0_INDEX:
 598                 v = (long)kvm_read_c0_guest_index(cop0);
 599                 break;
 600         case KVM_REG_MIPS_CP0_CONTEXT:
 601                 v = (long)kvm_read_c0_guest_context(cop0);
 602                 break;
 603         case KVM_REG_MIPS_CP0_PAGEMASK:
 604                 v = (long)kvm_read_c0_guest_pagemask(cop0);
 605                 break;
 606         case KVM_REG_MIPS_CP0_WIRED:
 607                 v = (long)kvm_read_c0_guest_wired(cop0);
 608                 break;
 609         case KVM_REG_MIPS_CP0_BADVADDR:
 610                 v = (long)kvm_read_c0_guest_badvaddr(cop0);
 611                 break;
 612         case KVM_REG_MIPS_CP0_ENTRYHI:
 613                 v = (long)kvm_read_c0_guest_entryhi(cop0);
 614                 break;
 615         case KVM_REG_MIPS_CP0_STATUS:
 616                 v = (long)kvm_read_c0_guest_status(cop0);
 617                 break;
 618         case KVM_REG_MIPS_CP0_CAUSE:
 619                 v = (long)kvm_read_c0_guest_cause(cop0);
 620                 break;
 621         case KVM_REG_MIPS_CP0_ERROREPC:
 622                 v = (long)kvm_read_c0_guest_errorepc(cop0);
 623                 break;
 624         case KVM_REG_MIPS_CP0_CONFIG:
 625                 v = (long)kvm_read_c0_guest_config(cop0);
 626                 break;
 627         case KVM_REG_MIPS_CP0_CONFIG1:
 628                 v = (long)kvm_read_c0_guest_config1(cop0);
 629                 break;
 630         case KVM_REG_MIPS_CP0_CONFIG2:
 631                 v = (long)kvm_read_c0_guest_config2(cop0);
 632                 break;
 633         case KVM_REG_MIPS_CP0_CONFIG3:
 634                 v = (long)kvm_read_c0_guest_config3(cop0);
 635                 break;
 636         case KVM_REG_MIPS_CP0_CONFIG7:
 637                 v = (long)kvm_read_c0_guest_config7(cop0);
 638                 break;
 639         default:
 640                 return -EINVAL;
 641         }
 642         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 643                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 644                 return put_user(v, uaddr64);
 645         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 646                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 647                 u32 v32 = (u32)v;
 648                 return put_user(v32, uaddr32);
 649         } else {
 650                 return -EINVAL;
 651         }
 652 }
 653
 654 static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
 655                             const struct kvm_one_reg *reg)
 656 {
 657         struct mips_coproc *cop0 = vcpu->arch.cop0;
 658         u64 v;
 659
 660         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 661                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 662
 663                 if (get_user(v, uaddr64) != 0)
 664                         return -EFAULT;
 665         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 666                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 667                 s32 v32;
 668
 669                 if (get_user(v32, uaddr32) != 0)
 670                         return -EFAULT;
 671                 v = (s64)v32;
 672         } else {
 673                 return -EINVAL;
 674         }
 675
 676         switch (reg->id) {
 677         case KVM_REG_MIPS_R0:
 678                 /* Silently ignore requests to set $0 */
 679                 break;
 680         case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
 681                 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
 682                 break;
 683         case KVM_REG_MIPS_HI:
 684                 vcpu->arch.hi = v;
 685                 break;
 686         case KVM_REG_MIPS_LO:
 687                 vcpu->arch.lo = v;
 688                 break;
 689         case KVM_REG_MIPS_PC:
 690                 vcpu->arch.pc = v;
 691                 break;
 692
 693         case KVM_REG_MIPS_CP0_INDEX:
 694                 kvm_write_c0_guest_index(cop0, v);
 695                 break;
 696         case KVM_REG_MIPS_CP0_CONTEXT:
 697                 kvm_write_c0_guest_context(cop0, v);
 698                 break;
 699         case KVM_REG_MIPS_CP0_PAGEMASK:
 700                 kvm_write_c0_guest_pagemask(cop0, v);
 701                 break;
 702         case KVM_REG_MIPS_CP0_WIRED:
 703                 kvm_write_c0_guest_wired(cop0, v);
 704                 break;
 705         case KVM_REG_MIPS_CP0_BADVADDR:
 706                 kvm_write_c0_guest_badvaddr(cop0, v);
 707                 break;
 708         case KVM_REG_MIPS_CP0_ENTRYHI:
 709                 kvm_write_c0_guest_entryhi(cop0, v);
 710                 break;
 711         case KVM_REG_MIPS_CP0_STATUS:
 712                 kvm_write_c0_guest_status(cop0, v);
 713                 break;
 714         case KVM_REG_MIPS_CP0_CAUSE:
 715                 kvm_write_c0_guest_cause(cop0, v);
 716                 break;
 717         case KVM_REG_MIPS_CP0_ERROREPC:
 718                 kvm_write_c0_guest_errorepc(cop0, v);
 719                 break;
 720         default:
 721                 return -EINVAL;
 722         }
 723         return 0;
 724 }
 725
 726 long
 727 kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 728 {
 729         struct kvm_vcpu *vcpu = filp->private_data;
 730         void __user *argp = (void __user *)arg;
 731         long r;
 732
 733         switch (ioctl) {
 734         case KVM_SET_ONE_REG:
 735         case KVM_GET_ONE_REG: {
 736                 struct kvm_one_reg reg;
 737                 if (copy_from_user(&reg, argp, sizeof(reg)))
 738                         return -EFAULT;
 739                 if (ioctl == KVM_SET_ONE_REG)
 740                         return kvm_mips_set_reg(vcpu, &reg);
 741                 else
 742                         return kvm_mips_get_reg(vcpu, &reg);
 743         }
 744         case KVM_GET_REG_LIST: {
 745                 struct kvm_reg_list __user *user_list = argp;
 746                 u64 __user *reg_dest;
 747                 struct kvm_reg_list reg_list;
 748                 unsigned n;
 749
 750                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 751                         return -EFAULT;
 752                 n = reg_list.n;
 753                 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
 754                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 755                         return -EFAULT;
 756                 if (n < reg_list.n)
 757                         return -E2BIG;
 758                 reg_dest = user_list->reg;
 759                 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
 760                                  sizeof(kvm_mips_get_one_regs)))
 761                         return -EFAULT;
 762                 return 0;
 763         }
 764         case KVM_NMI:
 765                 /* Treat the NMI as a CPU reset */
 766                 r = kvm_mips_reset_vcpu(vcpu);
 767                 break;
 768         case KVM_INTERRUPT:
 769                 {
 770                         struct kvm_mips_interrupt irq;
 771                         r = -EFAULT;
 772                         if (copy_from_user(&irq, argp, sizeof(irq)))
 773                                 goto out;
 774
 775                         kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
 776                                   irq.irq);
 777
 778                         r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 779                         break;
 780                 }
 781         default:
 782                 r = -ENOIOCTLCMD;
 783         }
 784
 785 out:
 786         return r;
 787 }
 788
 789 /*
 790  * Get (and clear) the dirty memory log for a memory slot.
 791  */
 792 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 793 {
 794         struct kvm_memory_slot *memslot;
 795         unsigned long ga, ga_end;
 796         int is_dirty = 0;
 797         int r;
 798         unsigned long n;
 799
 800         mutex_lock(&kvm->slots_lock);
 801
 802         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 803         if (r)
 804                 goto out;
 805
 806         /* If nothing is dirty, don't bother messing with page tables. */
 807         if (is_dirty) {
 808                 memslot = &kvm->memslots->memslots[log->slot];
 809
 810                 ga = memslot->base_gfn << PAGE_SHIFT;
 811                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
 812
 813                 printk("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
 814                        ga_end);
 815
 816                 n = kvm_dirty_bitmap_bytes(memslot);
 817                 memset(memslot->dirty_bitmap, 0, n);
 818         }
 819
 820         r = 0;
 821 out:
 822         mutex_unlock(&kvm->slots_lock);
 823         return r;
 824
 825 }
 826
 827 long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 828 {
 829         long r;
 830
 831         switch (ioctl) {
 832         default:
 833                 r = -ENOIOCTLCMD;
 834         }
 835
 836         return r;
 837 }
 838
 839 int kvm_arch_init(void *opaque)
 840 {
 841         int ret;
 842
 843         if (kvm_mips_callbacks) {
 844                 kvm_err("kvm: module already exists\n");
 845                 return -EEXIST;
 846         }
 847
 848         ret = kvm_mips_emulation_init(&kvm_mips_callbacks);
 849
 850         return ret;
 851 }
 852
 853 void kvm_arch_exit(void)
 854 {
 855         kvm_mips_callbacks = NULL;
 856 }
 857
 858 int
 859 kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 860 {
 861         return -ENOIOCTLCMD;
 862 }
 863
 864 int
 865 kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 866 {
 867         return -ENOIOCTLCMD;
 868 }
 869
 870 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 871 {
 872         return 0;
 873 }
 874
 875 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 876 {
 877         return -ENOIOCTLCMD;
 878 }
 879
 880 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 881 {
 882         return -ENOIOCTLCMD;
 883 }
 884
 885 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 886 {
 887         return VM_FAULT_SIGBUS;
 888 }
 889
 890 int kvm_dev_ioctl_check_extension(long ext)
 891 {
 892         int r;
 893
 894         switch (ext) {
 895         case KVM_CAP_ONE_REG:
 896                 r = 1;
 897                 break;
 898         case KVM_CAP_COALESCED_MMIO:
 899                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 900                 break;
 901         default:
 902                 r = 0;
 903                 break;
 904         }
 905         return r;
 906 }
 907
 908 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 909 {
 910         return kvm_mips_pending_timer(vcpu);
 911 }
 912
 913 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
 914 {
 915         int i;
 916         struct mips_coproc *cop0;
 917
 918         if (!vcpu)
 919                 return -1;
 920
 921         printk("VCPU Register Dump:\n");
 922         printk("\tpc = 0x%08lx\n", vcpu->arch.pc);;
 923         printk("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
 924
 925         for (i = 0; i < 32; i += 4) {
 926                 printk("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
 927                        vcpu->arch.gprs[i],
 928                        vcpu->arch.gprs[i + 1],
 929                        vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
 930         }
 931         printk("\thi: 0x%08lx\n", vcpu->arch.hi);
 932         printk("\tlo: 0x%08lx\n", vcpu->arch.lo);
 933
 934         cop0 = vcpu->arch.cop0;
 935         printk("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
 936                kvm_read_c0_guest_status(cop0), kvm_read_c0_guest_cause(cop0));
 937
 938         printk("\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 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
 983 /*
 984  * low level hrtimer wake routine.
 985  */
 986 enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
 987 {
 988         struct kvm_vcpu *vcpu;
 989
 990         vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
 991         kvm_mips_comparecount_func((unsigned long) vcpu);
 992         hrtimer_forward_now(&vcpu->arch.comparecount_timer,
 993                             ktime_set(0, MS_TO_NS(10)));
 994         return HRTIMER_RESTART;
 995 }
 996
 997 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 998 {
 999         kvm_mips_callbacks->vcpu_init(vcpu);
1000         hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
1001                      HRTIMER_MODE_REL);
1002         vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
1003         kvm_mips_init_shadow_tlb(vcpu);
1004         return 0;
1005 }
1006
1007 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
1008 {
1009         return;
1010 }
1011
1012 int
1013 kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr)
1014 {
1015         return 0;
1016 }
1017
1018 /* Initial guest state */
1019 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1020 {
1021         return kvm_mips_callbacks->vcpu_setup(vcpu);
1022 }
1023
1024 static
1025 void kvm_mips_set_c0_status(void)
1026 {
1027         uint32_t status = read_c0_status();
1028
1029         if (cpu_has_fpu)
1030                 status |= (ST0_CU1);
1031
1032         if (cpu_has_dsp)
1033                 status |= (ST0_MX);
1034
1035         write_c0_status(status);
1036         ehb();
1037 }
1038
1039 /*
1040  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
1041  */
1042 int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1043 {
1044         uint32_t cause = vcpu->arch.host_cp0_cause;
1045         uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
1046         uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
1047         unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
1048         enum emulation_result er = EMULATE_DONE;
1049         int ret = RESUME_GUEST;
1050
1051         /* Set a default exit reason */
1052         run->exit_reason = KVM_EXIT_UNKNOWN;
1053         run->ready_for_interrupt_injection = 1;
1054
1055         /* Set the appropriate status bits based on host CPU features, before we hit the scheduler */
1056         kvm_mips_set_c0_status();
1057
1058         local_irq_enable();
1059
1060         kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
1061                         cause, opc, run, vcpu);
1062
1063         /* Do a privilege check, if in UM most of these exit conditions end up
1064          * causing an exception to be delivered to the Guest Kernel
1065          */
1066         er = kvm_mips_check_privilege(cause, opc, run, vcpu);
1067         if (er == EMULATE_PRIV_FAIL) {
1068                 goto skip_emul;
1069         } else if (er == EMULATE_FAIL) {
1070                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1071                 ret = RESUME_HOST;
1072                 goto skip_emul;
1073         }
1074
1075         switch (exccode) {
1076         case T_INT:
1077                 kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc);
1078
1079                 ++vcpu->stat.int_exits;
1080                 trace_kvm_exit(vcpu, INT_EXITS);
1081
1082                 if (need_resched()) {
1083                         cond_resched();
1084                 }
1085
1086                 ret = RESUME_GUEST;
1087                 break;
1088
1089         case T_COP_UNUSABLE:
1090                 kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
1091
1092                 ++vcpu->stat.cop_unusable_exits;
1093                 trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
1094                 ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
1095                 /* XXXKYMA: Might need to return to user space */
1096                 if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) {
1097                         ret = RESUME_HOST;
1098                 }
1099                 break;
1100
1101         case T_TLB_MOD:
1102                 ++vcpu->stat.tlbmod_exits;
1103                 trace_kvm_exit(vcpu, TLBMOD_EXITS);
1104                 ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
1105                 break;
1106
1107         case T_TLB_ST_MISS:
1108                 kvm_debug
1109                     ("TLB ST fault:  cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
1110                      cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
1111                      badvaddr);
1112
1113                 ++vcpu->stat.tlbmiss_st_exits;
1114                 trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
1115                 ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
1116                 break;
1117
1118         case T_TLB_LD_MISS:
1119                 kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
1120                           cause, opc, badvaddr);
1121
1122                 ++vcpu->stat.tlbmiss_ld_exits;
1123                 trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
1124                 ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
1125                 break;
1126
1127         case T_ADDR_ERR_ST:
1128                 ++vcpu->stat.addrerr_st_exits;
1129                 trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
1130                 ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
1131                 break;
1132
1133         case T_ADDR_ERR_LD:
1134                 ++vcpu->stat.addrerr_ld_exits;
1135                 trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
1136                 ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
1137                 break;
1138
1139         case T_SYSCALL:
1140                 ++vcpu->stat.syscall_exits;
1141                 trace_kvm_exit(vcpu, SYSCALL_EXITS);
1142                 ret = kvm_mips_callbacks->handle_syscall(vcpu);
1143                 break;
1144
1145         case T_RES_INST:
1146                 ++vcpu->stat.resvd_inst_exits;
1147                 trace_kvm_exit(vcpu, RESVD_INST_EXITS);
1148                 ret = kvm_mips_callbacks->handle_res_inst(vcpu);
1149                 break;
1150
1151         case T_BREAK:
1152                 ++vcpu->stat.break_inst_exits;
1153                 trace_kvm_exit(vcpu, BREAK_INST_EXITS);
1154                 ret = kvm_mips_callbacks->handle_break(vcpu);
1155                 break;
1156
1157         default:
1158                 kvm_err
1159                     ("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x  BadVaddr: %#lx Status: %#lx\n",
1160                      exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
1161                      kvm_read_c0_guest_status(vcpu->arch.cop0));
1162                 kvm_arch_vcpu_dump_regs(vcpu);
1163                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1164                 ret = RESUME_HOST;
1165                 break;
1166
1167         }
1168
1169 skip_emul:
1170         local_irq_disable();
1171
1172         if (er == EMULATE_DONE && !(ret & RESUME_HOST))
1173                 kvm_mips_deliver_interrupts(vcpu, cause);
1174
1175         if (!(ret & RESUME_HOST)) {
1176                 /* Only check for signals if not already exiting to userspace  */
1177                 if (signal_pending(current)) {
1178                         run->exit_reason = KVM_EXIT_INTR;
1179                         ret = (-EINTR << 2) | RESUME_HOST;
1180                         ++vcpu->stat.signal_exits;
1181                         trace_kvm_exit(vcpu, SIGNAL_EXITS);
1182                 }
1183         }
1184
1185         return ret;
1186 }
1187
1188 int __init kvm_mips_init(void)
1189 {
1190         int ret;
1191
1192         ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1193
1194         if (ret)
1195                 return ret;
1196
1197         /* On MIPS, kernel modules are executed from "mapped space", which requires TLBs.
1198          * The TLB handling code is statically linked with the rest of the kernel (kvm_tlb.c)
1199          * to avoid the possibility of double faulting. The issue is that the TLB code
1200          * references routines that are part of the the KVM module,
1201          * which are only available once the module is loaded.
1202          */
1203         kvm_mips_gfn_to_pfn = gfn_to_pfn;
1204         kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
1205         kvm_mips_is_error_pfn = is_error_pfn;
1206
1207         pr_info("KVM/MIPS Initialized\n");
1208         return 0;
1209 }
1210
1211 void __exit kvm_mips_exit(void)
1212 {
1213         kvm_exit();
1214
1215         kvm_mips_gfn_to_pfn = NULL;
1216         kvm_mips_release_pfn_clean = NULL;
1217         kvm_mips_is_error_pfn = NULL;
1218
1219         pr_info("KVM/MIPS unloaded\n");
1220 }
1221
1222 module_init(kvm_mips_init);
1223 module_exit(kvm_mips_exit);
1224
1225 EXPORT_TRACEPOINT_SYMBOL(kvm_exit);