Pileus Git - ~andy/linux/blob - 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/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 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 212                                 struct kvm_memory_slot *memslot,
 213                                 struct kvm_userspace_memory_region *mem,
 214                                 enum kvm_mr_change change)
 215 {
 216         return 0;
 217 }
 218
 219 void kvm_arch_commit_memory_region(struct kvm *kvm,
 220                                 struct kvm_userspace_memory_region *mem,
 221                                 const struct kvm_memory_slot *old,
 222                                 enum kvm_mr_change change)
 223 {
 224         unsigned long npages = 0;
 225         int i, err = 0;
 226
 227         kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
 228                   __func__, kvm, mem->slot, mem->guest_phys_addr,
 229                   mem->memory_size, mem->userspace_addr);
 230
 231         /* Setup Guest PMAP table */
 232         if (!kvm->arch.guest_pmap) {
 233                 if (mem->slot == 0)
 234                         npages = mem->memory_size >> PAGE_SHIFT;
 235
 236                 if (npages) {
 237                         kvm->arch.guest_pmap_npages = npages;
 238                         kvm->arch.guest_pmap =
 239                             kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
 240
 241                         if (!kvm->arch.guest_pmap) {
 242                                 kvm_err("Failed to allocate guest PMAP");
 243                                 err = -ENOMEM;
 244                                 goto out;
 245                         }
 246
 247                         kvm_info
 248                             ("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
 249                              npages, kvm->arch.guest_pmap);
 250
 251                         /* Now setup the page table */
 252                         for (i = 0; i < npages; i++) {
 253                                 kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
 254                         }
 255                 }
 256         }
 257 out:
 258         return;
 259 }
 260
 261 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 262 {
 263 }
 264
 265 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 266                                    struct kvm_memory_slot *slot)
 267 {
 268 }
 269
 270 void kvm_arch_flush_shadow(struct kvm *kvm)
 271 {
 272 }
 273
 274 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 275 {
 276         extern char mips32_exception[], mips32_exceptionEnd[];
 277         extern char mips32_GuestException[], mips32_GuestExceptionEnd[];
 278         int err, size, offset;
 279         void *gebase;
 280         int i;
 281
 282         struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
 283
 284         if (!vcpu) {
 285                 err = -ENOMEM;
 286                 goto out;
 287         }
 288
 289         err = kvm_vcpu_init(vcpu, kvm, id);
 290
 291         if (err)
 292                 goto out_free_cpu;
 293
 294         kvm_info("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
 295
 296         /* Allocate space for host mode exception handlers that handle
 297          * guest mode exits
 298          */
 299         if (cpu_has_veic || cpu_has_vint) {
 300                 size = 0x200 + VECTORSPACING * 64;
 301         } else {
 302                 size = 0x200;
 303         }
 304
 305         /* Save Linux EBASE */
 306         vcpu->arch.host_ebase = (void *)read_c0_ebase();
 307
 308         gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
 309
 310         if (!gebase) {
 311                 err = -ENOMEM;
 312                 goto out_free_cpu;
 313         }
 314         kvm_info("Allocated %d bytes for KVM Exception Handlers @ %p\n",
 315                  ALIGN(size, PAGE_SIZE), gebase);
 316
 317         /* Save new ebase */
 318         vcpu->arch.guest_ebase = gebase;
 319
 320         /* Copy L1 Guest Exception handler to correct offset */
 321
 322         /* TLB Refill, EXL = 0 */
 323         memcpy(gebase, mips32_exception,
 324                mips32_exceptionEnd - mips32_exception);
 325
 326         /* General Exception Entry point */
 327         memcpy(gebase + 0x180, mips32_exception,
 328                mips32_exceptionEnd - mips32_exception);
 329
 330         /* For vectored interrupts poke the exception code @ all offsets 0-7 */
 331         for (i = 0; i < 8; i++) {
 332                 kvm_debug("L1 Vectored handler @ %p\n",
 333                           gebase + 0x200 + (i * VECTORSPACING));
 334                 memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
 335                        mips32_exceptionEnd - mips32_exception);
 336         }
 337
 338         /* General handler, relocate to unmapped space for sanity's sake */
 339         offset = 0x2000;
 340         kvm_info("Installing KVM Exception handlers @ %p, %#x bytes\n",
 341                  gebase + offset,
 342                  mips32_GuestExceptionEnd - mips32_GuestException);
 343
 344         memcpy(gebase + offset, mips32_GuestException,
 345                mips32_GuestExceptionEnd - mips32_GuestException);
 346
 347         /* Invalidate the icache for these ranges */
 348         mips32_SyncICache((unsigned long) gebase, ALIGN(size, PAGE_SIZE));
 349
 350         /* Allocate comm page for guest kernel, a TLB will be reserved for mapping GVA @ 0xFFFF8000 to this page */
 351         vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
 352
 353         if (!vcpu->arch.kseg0_commpage) {
 354                 err = -ENOMEM;
 355                 goto out_free_gebase;
 356         }
 357
 358         kvm_info("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
 359         kvm_mips_commpage_init(vcpu);
 360
 361         /* Init */
 362         vcpu->arch.last_sched_cpu = -1;
 363
 364         /* Start off the timer */
 365         kvm_mips_emulate_count(vcpu);
 366
 367         return vcpu;
 368
 369 out_free_gebase:
 370         kfree(gebase);
 371
 372 out_free_cpu:
 373         kfree(vcpu);
 374
 375 out:
 376         return ERR_PTR(err);
 377 }
 378
 379 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 380 {
 381         hrtimer_cancel(&vcpu->arch.comparecount_timer);
 382
 383         kvm_vcpu_uninit(vcpu);
 384
 385         kvm_mips_dump_stats(vcpu);
 386
 387         if (vcpu->arch.guest_ebase)
 388                 kfree(vcpu->arch.guest_ebase);
 389
 390         if (vcpu->arch.kseg0_commpage)
 391                 kfree(vcpu->arch.kseg0_commpage);
 392
 393 }
 394
 395 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 396 {
 397         kvm_arch_vcpu_free(vcpu);
 398 }
 399
 400 int
 401 kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 402                                     struct kvm_guest_debug *dbg)
 403 {
 404         return -ENOIOCTLCMD;
 405 }
 406
 407 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 408 {
 409         int r = 0;
 410         sigset_t sigsaved;
 411
 412         if (vcpu->sigset_active)
 413                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 414
 415         if (vcpu->mmio_needed) {
 416                 if (!vcpu->mmio_is_write)
 417                         kvm_mips_complete_mmio_load(vcpu, run);
 418                 vcpu->mmio_needed = 0;
 419         }
 420
 421         /* Check if we have any exceptions/interrupts pending */
 422         kvm_mips_deliver_interrupts(vcpu,
 423                                     kvm_read_c0_guest_cause(vcpu->arch.cop0));
 424
 425         local_irq_disable();
 426         kvm_guest_enter();
 427
 428         r = __kvm_mips_vcpu_run(run, vcpu);
 429
 430         kvm_guest_exit();
 431         local_irq_enable();
 432
 433         if (vcpu->sigset_active)
 434                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 435
 436         return r;
 437 }
 438
 439 int
 440 kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
 441 {
 442         int intr = (int)irq->irq;
 443         struct kvm_vcpu *dvcpu = NULL;
 444
 445         if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
 446                 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
 447                           (int)intr);
 448
 449         if (irq->cpu == -1)
 450                 dvcpu = vcpu;
 451         else
 452                 dvcpu = vcpu->kvm->vcpus[irq->cpu];
 453
 454         if (intr == 2 || intr == 3 || intr == 4) {
 455                 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
 456
 457         } else if (intr == -2 || intr == -3 || intr == -4) {
 458                 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
 459         } else {
 460                 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
 461                         irq->cpu, irq->irq);
 462                 return -EINVAL;
 463         }
 464
 465         dvcpu->arch.wait = 0;
 466
 467         if (waitqueue_active(&dvcpu->wq)) {
 468                 wake_up_interruptible(&dvcpu->wq);
 469         }
 470
 471         return 0;
 472 }
 473
 474 int
 475 kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 476                                 struct kvm_mp_state *mp_state)
 477 {
 478         return -ENOIOCTLCMD;
 479 }
 480
 481 int
 482 kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 483                                 struct kvm_mp_state *mp_state)
 484 {
 485         return -ENOIOCTLCMD;
 486 }
 487
 488 #define MIPS_CP0_32(_R, _S)                                     \
 489         (KVM_REG_MIPS | KVM_REG_SIZE_U32 | 0x10000 | (8 * (_R) + (_S)))
 490
 491 #define MIPS_CP0_64(_R, _S)                                     \
 492         (KVM_REG_MIPS | KVM_REG_SIZE_U64 | 0x10000 | (8 * (_R) + (_S)))
 493
 494 #define KVM_REG_MIPS_CP0_INDEX          MIPS_CP0_32(0, 0)
 495 #define KVM_REG_MIPS_CP0_ENTRYLO0       MIPS_CP0_64(2, 0)
 496 #define KVM_REG_MIPS_CP0_ENTRYLO1       MIPS_CP0_64(3, 0)
 497 #define KVM_REG_MIPS_CP0_CONTEXT        MIPS_CP0_64(4, 0)
 498 #define KVM_REG_MIPS_CP0_USERLOCAL      MIPS_CP0_64(4, 2)
 499 #define KVM_REG_MIPS_CP0_PAGEMASK       MIPS_CP0_32(5, 0)
 500 #define KVM_REG_MIPS_CP0_PAGEGRAIN      MIPS_CP0_32(5, 1)
 501 #define KVM_REG_MIPS_CP0_WIRED          MIPS_CP0_32(6, 0)
 502 #define KVM_REG_MIPS_CP0_HWRENA         MIPS_CP0_32(7, 0)
 503 #define KVM_REG_MIPS_CP0_BADVADDR       MIPS_CP0_64(8, 0)
 504 #define KVM_REG_MIPS_CP0_COUNT          MIPS_CP0_32(9, 0)
 505 #define KVM_REG_MIPS_CP0_ENTRYHI        MIPS_CP0_64(10, 0)
 506 #define KVM_REG_MIPS_CP0_COMPARE        MIPS_CP0_32(11, 0)
 507 #define KVM_REG_MIPS_CP0_STATUS         MIPS_CP0_32(12, 0)
 508 #define KVM_REG_MIPS_CP0_CAUSE          MIPS_CP0_32(13, 0)
 509 #define KVM_REG_MIPS_CP0_EBASE          MIPS_CP0_64(15, 1)
 510 #define KVM_REG_MIPS_CP0_CONFIG         MIPS_CP0_32(16, 0)
 511 #define KVM_REG_MIPS_CP0_CONFIG1        MIPS_CP0_32(16, 1)
 512 #define KVM_REG_MIPS_CP0_CONFIG2        MIPS_CP0_32(16, 2)
 513 #define KVM_REG_MIPS_CP0_CONFIG3        MIPS_CP0_32(16, 3)
 514 #define KVM_REG_MIPS_CP0_CONFIG7        MIPS_CP0_32(16, 7)
 515 #define KVM_REG_MIPS_CP0_XCONTEXT       MIPS_CP0_64(20, 0)
 516 #define KVM_REG_MIPS_CP0_ERROREPC       MIPS_CP0_64(30, 0)
 517
 518 static u64 kvm_mips_get_one_regs[] = {
 519         KVM_REG_MIPS_R0,
 520         KVM_REG_MIPS_R1,
 521         KVM_REG_MIPS_R2,
 522         KVM_REG_MIPS_R3,
 523         KVM_REG_MIPS_R4,
 524         KVM_REG_MIPS_R5,
 525         KVM_REG_MIPS_R6,
 526         KVM_REG_MIPS_R7,
 527         KVM_REG_MIPS_R8,
 528         KVM_REG_MIPS_R9,
 529         KVM_REG_MIPS_R10,
 530         KVM_REG_MIPS_R11,
 531         KVM_REG_MIPS_R12,
 532         KVM_REG_MIPS_R13,
 533         KVM_REG_MIPS_R14,
 534         KVM_REG_MIPS_R15,
 535         KVM_REG_MIPS_R16,
 536         KVM_REG_MIPS_R17,
 537         KVM_REG_MIPS_R18,
 538         KVM_REG_MIPS_R19,
 539         KVM_REG_MIPS_R20,
 540         KVM_REG_MIPS_R21,
 541         KVM_REG_MIPS_R22,
 542         KVM_REG_MIPS_R23,
 543         KVM_REG_MIPS_R24,
 544         KVM_REG_MIPS_R25,
 545         KVM_REG_MIPS_R26,
 546         KVM_REG_MIPS_R27,
 547         KVM_REG_MIPS_R28,
 548         KVM_REG_MIPS_R29,
 549         KVM_REG_MIPS_R30,
 550         KVM_REG_MIPS_R31,
 551
 552         KVM_REG_MIPS_HI,
 553         KVM_REG_MIPS_LO,
 554         KVM_REG_MIPS_PC,
 555
 556         KVM_REG_MIPS_CP0_INDEX,
 557         KVM_REG_MIPS_CP0_CONTEXT,
 558         KVM_REG_MIPS_CP0_PAGEMASK,
 559         KVM_REG_MIPS_CP0_WIRED,
 560         KVM_REG_MIPS_CP0_BADVADDR,
 561         KVM_REG_MIPS_CP0_ENTRYHI,
 562         KVM_REG_MIPS_CP0_STATUS,
 563         KVM_REG_MIPS_CP0_CAUSE,
 564         /* EPC set via kvm_regs, et al. */
 565         KVM_REG_MIPS_CP0_CONFIG,
 566         KVM_REG_MIPS_CP0_CONFIG1,
 567         KVM_REG_MIPS_CP0_CONFIG2,
 568         KVM_REG_MIPS_CP0_CONFIG3,
 569         KVM_REG_MIPS_CP0_CONFIG7,
 570         KVM_REG_MIPS_CP0_ERROREPC
 571 };
 572
 573 static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
 574                             const struct kvm_one_reg *reg)
 575 {
 576         struct mips_coproc *cop0 = vcpu->arch.cop0;
 577         s64 v;
 578
 579         switch (reg->id) {
 580         case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
 581                 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
 582                 break;
 583         case KVM_REG_MIPS_HI:
 584                 v = (long)vcpu->arch.hi;
 585                 break;
 586         case KVM_REG_MIPS_LO:
 587                 v = (long)vcpu->arch.lo;
 588                 break;
 589         case KVM_REG_MIPS_PC:
 590                 v = (long)vcpu->arch.pc;
 591                 break;
 592
 593         case KVM_REG_MIPS_CP0_INDEX:
 594                 v = (long)kvm_read_c0_guest_index(cop0);
 595                 break;
 596         case KVM_REG_MIPS_CP0_CONTEXT:
 597                 v = (long)kvm_read_c0_guest_context(cop0);
 598                 break;
 599         case KVM_REG_MIPS_CP0_PAGEMASK:
 600                 v = (long)kvm_read_c0_guest_pagemask(cop0);
 601                 break;
 602         case KVM_REG_MIPS_CP0_WIRED:
 603                 v = (long)kvm_read_c0_guest_wired(cop0);
 604                 break;
 605         case KVM_REG_MIPS_CP0_BADVADDR:
 606                 v = (long)kvm_read_c0_guest_badvaddr(cop0);
 607                 break;
 608         case KVM_REG_MIPS_CP0_ENTRYHI:
 609                 v = (long)kvm_read_c0_guest_entryhi(cop0);
 610                 break;
 611         case KVM_REG_MIPS_CP0_STATUS:
 612                 v = (long)kvm_read_c0_guest_status(cop0);
 613                 break;
 614         case KVM_REG_MIPS_CP0_CAUSE:
 615                 v = (long)kvm_read_c0_guest_cause(cop0);
 616                 break;
 617         case KVM_REG_MIPS_CP0_ERROREPC:
 618                 v = (long)kvm_read_c0_guest_errorepc(cop0);
 619                 break;
 620         case KVM_REG_MIPS_CP0_CONFIG:
 621                 v = (long)kvm_read_c0_guest_config(cop0);
 622                 break;
 623         case KVM_REG_MIPS_CP0_CONFIG1:
 624                 v = (long)kvm_read_c0_guest_config1(cop0);
 625                 break;
 626         case KVM_REG_MIPS_CP0_CONFIG2:
 627                 v = (long)kvm_read_c0_guest_config2(cop0);
 628                 break;
 629         case KVM_REG_MIPS_CP0_CONFIG3:
 630                 v = (long)kvm_read_c0_guest_config3(cop0);
 631                 break;
 632         case KVM_REG_MIPS_CP0_CONFIG7:
 633                 v = (long)kvm_read_c0_guest_config7(cop0);
 634                 break;
 635         default:
 636                 return -EINVAL;
 637         }
 638         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 639                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 640                 return put_user(v, uaddr64);
 641         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 642                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 643                 u32 v32 = (u32)v;
 644                 return put_user(v32, uaddr32);
 645         } else {
 646                 return -EINVAL;
 647         }
 648 }
 649
 650 static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
 651                             const struct kvm_one_reg *reg)
 652 {
 653         struct mips_coproc *cop0 = vcpu->arch.cop0;
 654         u64 v;
 655
 656         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 657                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 658
 659                 if (get_user(v, uaddr64) != 0)
 660                         return -EFAULT;
 661         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 662                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 663                 s32 v32;
 664
 665                 if (get_user(v32, uaddr32) != 0)
 666                         return -EFAULT;
 667                 v = (s64)v32;
 668         } else {
 669                 return -EINVAL;
 670         }
 671
 672         switch (reg->id) {
 673         case KVM_REG_MIPS_R0:
 674                 /* Silently ignore requests to set $0 */
 675                 break;
 676         case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
 677                 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
 678                 break;
 679         case KVM_REG_MIPS_HI:
 680                 vcpu->arch.hi = v;
 681                 break;
 682         case KVM_REG_MIPS_LO:
 683                 vcpu->arch.lo = v;
 684                 break;
 685         case KVM_REG_MIPS_PC:
 686                 vcpu->arch.pc = v;
 687                 break;
 688
 689         case KVM_REG_MIPS_CP0_INDEX:
 690                 kvm_write_c0_guest_index(cop0, v);
 691                 break;
 692         case KVM_REG_MIPS_CP0_CONTEXT:
 693                 kvm_write_c0_guest_context(cop0, v);
 694                 break;
 695         case KVM_REG_MIPS_CP0_PAGEMASK:
 696                 kvm_write_c0_guest_pagemask(cop0, v);
 697                 break;
 698         case KVM_REG_MIPS_CP0_WIRED:
 699                 kvm_write_c0_guest_wired(cop0, v);
 700                 break;
 701         case KVM_REG_MIPS_CP0_BADVADDR:
 702                 kvm_write_c0_guest_badvaddr(cop0, v);
 703                 break;
 704         case KVM_REG_MIPS_CP0_ENTRYHI:
 705                 kvm_write_c0_guest_entryhi(cop0, v);
 706                 break;
 707         case KVM_REG_MIPS_CP0_STATUS:
 708                 kvm_write_c0_guest_status(cop0, v);
 709                 break;
 710         case KVM_REG_MIPS_CP0_CAUSE:
 711                 kvm_write_c0_guest_cause(cop0, v);
 712                 break;
 713         case KVM_REG_MIPS_CP0_ERROREPC:
 714                 kvm_write_c0_guest_errorepc(cop0, v);
 715                 break;
 716         default:
 717                 return -EINVAL;
 718         }
 719         return 0;
 720 }
 721
 722 long
 723 kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 724 {
 725         struct kvm_vcpu *vcpu = filp->private_data;
 726         void __user *argp = (void __user *)arg;
 727         long r;
 728
 729         switch (ioctl) {
 730         case KVM_SET_ONE_REG:
 731         case KVM_GET_ONE_REG: {
 732                 struct kvm_one_reg reg;
 733                 if (copy_from_user(&reg, argp, sizeof(reg)))
 734                         return -EFAULT;
 735                 if (ioctl == KVM_SET_ONE_REG)
 736                         return kvm_mips_set_reg(vcpu, &reg);
 737                 else
 738                         return kvm_mips_get_reg(vcpu, &reg);
 739         }
 740         case KVM_GET_REG_LIST: {
 741                 struct kvm_reg_list __user *user_list = argp;
 742                 u64 __user *reg_dest;
 743                 struct kvm_reg_list reg_list;
 744                 unsigned n;
 745
 746                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 747                         return -EFAULT;
 748                 n = reg_list.n;
 749                 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
 750                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 751                         return -EFAULT;
 752                 if (n < reg_list.n)
 753                         return -E2BIG;
 754                 reg_dest = user_list->reg;
 755                 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
 756                                  sizeof(kvm_mips_get_one_regs)))
 757                         return -EFAULT;
 758                 return 0;
 759         }
 760         case KVM_NMI:
 761                 /* Treat the NMI as a CPU reset */
 762                 r = kvm_mips_reset_vcpu(vcpu);
 763                 break;
 764         case KVM_INTERRUPT:
 765                 {
 766                         struct kvm_mips_interrupt irq;
 767                         r = -EFAULT;
 768                         if (copy_from_user(&irq, argp, sizeof(irq)))
 769                                 goto out;
 770
 771                         kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
 772                                   irq.irq);
 773
 774                         r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 775                         break;
 776                 }
 777         default:
 778                 r = -ENOIOCTLCMD;
 779         }
 780
 781 out:
 782         return r;
 783 }
 784
 785 /*
 786  * Get (and clear) the dirty memory log for a memory slot.
 787  */
 788 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 789 {
 790         struct kvm_memory_slot *memslot;
 791         unsigned long ga, ga_end;
 792         int is_dirty = 0;
 793         int r;
 794         unsigned long n;
 795
 796         mutex_lock(&kvm->slots_lock);
 797
 798         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 799         if (r)
 800                 goto out;
 801
 802         /* If nothing is dirty, don't bother messing with page tables. */
 803         if (is_dirty) {
 804                 memslot = &kvm->memslots->memslots[log->slot];
 805
 806                 ga = memslot->base_gfn << PAGE_SHIFT;
 807                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
 808
 809                 printk("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
 810                        ga_end);
 811
 812                 n = kvm_dirty_bitmap_bytes(memslot);
 813                 memset(memslot->dirty_bitmap, 0, n);
 814         }
 815
 816         r = 0;
 817 out:
 818         mutex_unlock(&kvm->slots_lock);
 819         return r;
 820
 821 }
 822
 823 long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 824 {
 825         long r;
 826
 827         switch (ioctl) {
 828         default:
 829                 r = -ENOIOCTLCMD;
 830         }
 831
 832         return r;
 833 }
 834
 835 int kvm_arch_init(void *opaque)
 836 {
 837         int ret;
 838
 839         if (kvm_mips_callbacks) {
 840                 kvm_err("kvm: module already exists\n");
 841                 return -EEXIST;
 842         }
 843
 844         ret = kvm_mips_emulation_init(&kvm_mips_callbacks);
 845
 846         return ret;
 847 }
 848
 849 void kvm_arch_exit(void)
 850 {
 851         kvm_mips_callbacks = NULL;
 852 }
 853
 854 int
 855 kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 856 {
 857         return -ENOIOCTLCMD;
 858 }
 859
 860 int
 861 kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 862 {
 863         return -ENOIOCTLCMD;
 864 }
 865
 866 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 867 {
 868         return 0;
 869 }
 870
 871 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 872 {
 873         return -ENOIOCTLCMD;
 874 }
 875
 876 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 877 {
 878         return -ENOIOCTLCMD;
 879 }
 880
 881 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 882 {
 883         return VM_FAULT_SIGBUS;
 884 }
 885
 886 int kvm_dev_ioctl_check_extension(long ext)
 887 {
 888         int r;
 889
 890         switch (ext) {
 891         case KVM_CAP_ONE_REG:
 892                 r = 1;
 893                 break;
 894         case KVM_CAP_COALESCED_MMIO:
 895                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 896                 break;
 897         default:
 898                 r = 0;
 899                 break;
 900         }
 901         return r;
 902 }
 903
 904 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 905 {
 906         return kvm_mips_pending_timer(vcpu);
 907 }
 908
 909 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
 910 {
 911         int i;
 912         struct mips_coproc *cop0;
 913
 914         if (!vcpu)
 915                 return -1;
 916
 917         printk("VCPU Register Dump:\n");
 918         printk("\tpc = 0x%08lx\n", vcpu->arch.pc);;
 919         printk("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
 920
 921         for (i = 0; i < 32; i += 4) {
 922                 printk("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
 923                        vcpu->arch.gprs[i],
 924                        vcpu->arch.gprs[i + 1],
 925                        vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
 926         }
 927         printk("\thi: 0x%08lx\n", vcpu->arch.hi);
 928         printk("\tlo: 0x%08lx\n", vcpu->arch.lo);
 929
 930         cop0 = vcpu->arch.cop0;
 931         printk("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
 932                kvm_read_c0_guest_status(cop0), kvm_read_c0_guest_cause(cop0));
 933
 934         printk("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
 935
 936         return 0;
 937 }
 938
 939 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 940 {
 941         int i;
 942
 943         for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 944                 vcpu->arch.gprs[i] = regs->gpr[i];
 945         vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
 946         vcpu->arch.hi = regs->hi;
 947         vcpu->arch.lo = regs->lo;
 948         vcpu->arch.pc = regs->pc;
 949
 950         return 0;
 951 }
 952
 953 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 954 {
 955         int i;
 956
 957         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 958                 regs->gpr[i] = vcpu->arch.gprs[i];
 959
 960         regs->hi = vcpu->arch.hi;
 961         regs->lo = vcpu->arch.lo;
 962         regs->pc = vcpu->arch.pc;
 963
 964         return 0;
 965 }
 966
 967 void kvm_mips_comparecount_func(unsigned long data)
 968 {
 969         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 970
 971         kvm_mips_callbacks->queue_timer_int(vcpu);
 972
 973         vcpu->arch.wait = 0;
 974         if (waitqueue_active(&vcpu->wq)) {
 975                 wake_up_interruptible(&vcpu->wq);
 976         }
 977 }
 978
 979 /*
 980  * low level hrtimer wake routine.
 981  */
 982 enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
 983 {
 984         struct kvm_vcpu *vcpu;
 985
 986         vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
 987         kvm_mips_comparecount_func((unsigned long) vcpu);
 988         hrtimer_forward_now(&vcpu->arch.comparecount_timer,
 989                             ktime_set(0, MS_TO_NS(10)));
 990         return HRTIMER_RESTART;
 991 }
 992
 993 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 994 {
 995         kvm_mips_callbacks->vcpu_init(vcpu);
 996         hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
 997                      HRTIMER_MODE_REL);
 998         vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
 999         kvm_mips_init_shadow_tlb(vcpu);
1000         return 0;
1001 }
1002
1003 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
1004 {
1005         return;
1006 }
1007
1008 int
1009 kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr)
1010 {
1011         return 0;
1012 }
1013
1014 /* Initial guest state */
1015 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1016 {
1017         return kvm_mips_callbacks->vcpu_setup(vcpu);
1018 }
1019
1020 static
1021 void kvm_mips_set_c0_status(void)
1022 {
1023         uint32_t status = read_c0_status();
1024
1025         if (cpu_has_fpu)
1026                 status |= (ST0_CU1);
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);