arch/mips/kvm/mips.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * KVM/MIPS: MIPS specific KVM APIs
   7  *
   8  * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
   9  * Authors: Sanjay Lal <sanjayl@kymasys.com>
  10  */
  11
  12 #include <linux/errno.h>
  13 #include <linux/err.h>
  14 #include <linux/kdebug.h>
  15 #include <linux/module.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/fs.h>
  18 #include <linux/bootmem.h>
  19 #include <asm/fpu.h>
  20 #include <asm/page.h>
  21 #include <asm/cacheflush.h>
  22 #include <asm/mmu_context.h>
  23 #include <asm/pgtable.h>
  24
  25 #include <linux/kvm_host.h>
  26
  27 #include "interrupt.h"
  28 #include "commpage.h"
  29
  30 #define CREATE_TRACE_POINTS
  31 #include "trace.h"
  32
  33 #ifndef VECTORSPACING
  34 #define VECTORSPACING 0x100     /* for EI/VI mode */
  35 #endif
  36
  37 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x)
  38 struct kvm_stats_debugfs_item debugfs_entries[] = {
  39         { "wait",         VCPU_STAT(wait_exits),         KVM_STAT_VCPU },
  40         { "cache",        VCPU_STAT(cache_exits),        KVM_STAT_VCPU },
  41         { "signal",       VCPU_STAT(signal_exits),       KVM_STAT_VCPU },
  42         { "interrupt",    VCPU_STAT(int_exits),          KVM_STAT_VCPU },
  43         { "cop_unsuable", VCPU_STAT(cop_unusable_exits), KVM_STAT_VCPU },
  44         { "tlbmod",       VCPU_STAT(tlbmod_exits),       KVM_STAT_VCPU },
  45         { "tlbmiss_ld",   VCPU_STAT(tlbmiss_ld_exits),   KVM_STAT_VCPU },
  46         { "tlbmiss_st",   VCPU_STAT(tlbmiss_st_exits),   KVM_STAT_VCPU },
  47         { "addrerr_st",   VCPU_STAT(addrerr_st_exits),   KVM_STAT_VCPU },
  48         { "addrerr_ld",   VCPU_STAT(addrerr_ld_exits),   KVM_STAT_VCPU },
  49         { "syscall",      VCPU_STAT(syscall_exits),      KVM_STAT_VCPU },
  50         { "resvd_inst",   VCPU_STAT(resvd_inst_exits),   KVM_STAT_VCPU },
  51         { "break_inst",   VCPU_STAT(break_inst_exits),   KVM_STAT_VCPU },
  52         { "trap_inst",    VCPU_STAT(trap_inst_exits),    KVM_STAT_VCPU },
  53         { "fpe",          VCPU_STAT(fpe_exits),          KVM_STAT_VCPU },
  54         { "flush_dcache", VCPU_STAT(flush_dcache_exits), KVM_STAT_VCPU },
  55         { "halt_successful_poll", VCPU_STAT(halt_successful_poll), KVM_STAT_VCPU },
  56         { "halt_wakeup",  VCPU_STAT(halt_wakeup),        KVM_STAT_VCPU },
  57         {NULL}
  58 };
  59
  60 static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
  61 {
  62         int i;
  63
  64         for_each_possible_cpu(i) {
  65                 vcpu->arch.guest_kernel_asid[i] = 0;
  66                 vcpu->arch.guest_user_asid[i] = 0;
  67         }
  68
  69         return 0;
  70 }
  71
  72 /*
  73  * XXXKYMA: We are simulatoring a processor that has the WII bit set in
  74  * Config7, so we are "runnable" if interrupts are pending
  75  */
  76 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
  77 {
  78         return !!(vcpu->arch.pending_exceptions);
  79 }
  80
  81 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  82 {
  83         return 1;
  84 }
  85
  86 int kvm_arch_hardware_enable(void)
  87 {
  88         return 0;
  89 }
  90
  91 int kvm_arch_hardware_setup(void)
  92 {
  93         return 0;
  94 }
  95
  96 void kvm_arch_check_processor_compat(void *rtn)
  97 {
  98         *(int *)rtn = 0;
  99 }
 100
 101 static void kvm_mips_init_tlbs(struct kvm *kvm)
 102 {
 103         unsigned long wired;
 104
 105         /*
 106          * Add a wired entry to the TLB, it is used to map the commpage to
 107          * the Guest kernel
 108          */
 109         wired = read_c0_wired();
 110         write_c0_wired(wired + 1);
 111         mtc0_tlbw_hazard();
 112         kvm->arch.commpage_tlb = wired;
 113
 114         kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
 115                   kvm->arch.commpage_tlb);
 116 }
 117
 118 static void kvm_mips_init_vm_percpu(void *arg)
 119 {
 120         struct kvm *kvm = (struct kvm *)arg;
 121
 122         kvm_mips_init_tlbs(kvm);
 123         kvm_mips_callbacks->vm_init(kvm);
 124
 125 }
 126
 127 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 128 {
 129         if (atomic_inc_return(&kvm_mips_instance) == 1) {
 130                 kvm_debug("%s: 1st KVM instance, setup host TLB parameters\n",
 131                           __func__);
 132                 on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
 133         }
 134
 135         return 0;
 136 }
 137
 138 void kvm_mips_free_vcpus(struct kvm *kvm)
 139 {
 140         unsigned int i;
 141         struct kvm_vcpu *vcpu;
 142
 143         /* Put the pages we reserved for the guest pmap */
 144         for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
 145                 if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
 146                         kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
 147         }
 148         kfree(kvm->arch.guest_pmap);
 149
 150         kvm_for_each_vcpu(i, vcpu, kvm) {
 151                 kvm_arch_vcpu_free(vcpu);
 152         }
 153
 154         mutex_lock(&kvm->lock);
 155
 156         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 157                 kvm->vcpus[i] = NULL;
 158
 159         atomic_set(&kvm->online_vcpus, 0);
 160
 161         mutex_unlock(&kvm->lock);
 162 }
 163
 164 static void kvm_mips_uninit_tlbs(void *arg)
 165 {
 166         /* Restore wired count */
 167         write_c0_wired(0);
 168         mtc0_tlbw_hazard();
 169         /* Clear out all the TLBs */
 170         kvm_local_flush_tlb_all();
 171 }
 172
 173 void kvm_arch_destroy_vm(struct kvm *kvm)
 174 {
 175         kvm_mips_free_vcpus(kvm);
 176
 177         /* If this is the last instance, restore wired count */
 178         if (atomic_dec_return(&kvm_mips_instance) == 0) {
 179                 kvm_debug("%s: last KVM instance, restoring TLB parameters\n",
 180                           __func__);
 181                 on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
 182         }
 183 }
 184
 185 long kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl,
 186                         unsigned long arg)
 187 {
 188         return -ENOIOCTLCMD;
 189 }
 190
 191 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
 192                             unsigned long npages)
 193 {
 194         return 0;
 195 }
 196
 197 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 198                                    struct kvm_memory_slot *memslot,
 199                                    struct kvm_userspace_memory_region *mem,
 200                                    enum kvm_mr_change change)
 201 {
 202         return 0;
 203 }
 204
 205 void kvm_arch_commit_memory_region(struct kvm *kvm,
 206                                    struct kvm_userspace_memory_region *mem,
 207                                    const struct kvm_memory_slot *old,
 208                                    enum kvm_mr_change change)
 209 {
 210         unsigned long npages = 0;
 211         int i;
 212
 213         kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
 214                   __func__, kvm, mem->slot, mem->guest_phys_addr,
 215                   mem->memory_size, mem->userspace_addr);
 216
 217         /* Setup Guest PMAP table */
 218         if (!kvm->arch.guest_pmap) {
 219                 if (mem->slot == 0)
 220                         npages = mem->memory_size >> PAGE_SHIFT;
 221
 222                 if (npages) {
 223                         kvm->arch.guest_pmap_npages = npages;
 224                         kvm->arch.guest_pmap =
 225                             kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
 226
 227                         if (!kvm->arch.guest_pmap) {
 228                                 kvm_err("Failed to allocate guest PMAP");
 229                                 return;
 230                         }
 231
 232                         kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
 233                                   npages, kvm->arch.guest_pmap);
 234
 235                         /* Now setup the page table */
 236                         for (i = 0; i < npages; i++)
 237                                 kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
 238                 }
 239         }
 240 }
 241
 242 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 243 {
 244         int err, size, offset;
 245         void *gebase;
 246         int i;
 247
 248         struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
 249
 250         if (!vcpu) {
 251                 err = -ENOMEM;
 252                 goto out;
 253         }
 254
 255         err = kvm_vcpu_init(vcpu, kvm, id);
 256
 257         if (err)
 258                 goto out_free_cpu;
 259
 260         kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
 261
 262         /*
 263          * Allocate space for host mode exception handlers that handle
 264          * guest mode exits
 265          */
 266         if (cpu_has_veic || cpu_has_vint)
 267                 size = 0x200 + VECTORSPACING * 64;
 268         else
 269                 size = 0x4000;
 270
 271         /* Save Linux EBASE */
 272         vcpu->arch.host_ebase = (void *)read_c0_ebase();
 273
 274         gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
 275
 276         if (!gebase) {
 277                 err = -ENOMEM;
 278                 goto out_free_cpu;
 279         }
 280         kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n",
 281                   ALIGN(size, PAGE_SIZE), gebase);
 282
 283         /* Save new ebase */
 284         vcpu->arch.guest_ebase = gebase;
 285
 286         /* Copy L1 Guest Exception handler to correct offset */
 287
 288         /* TLB Refill, EXL = 0 */
 289         memcpy(gebase, mips32_exception,
 290                mips32_exceptionEnd - mips32_exception);
 291
 292         /* General Exception Entry point */
 293         memcpy(gebase + 0x180, mips32_exception,
 294                mips32_exceptionEnd - mips32_exception);
 295
 296         /* For vectored interrupts poke the exception code @ all offsets 0-7 */
 297         for (i = 0; i < 8; i++) {
 298                 kvm_debug("L1 Vectored handler @ %p\n",
 299                           gebase + 0x200 + (i * VECTORSPACING));
 300                 memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
 301                        mips32_exceptionEnd - mips32_exception);
 302         }
 303
 304         /* General handler, relocate to unmapped space for sanity's sake */
 305         offset = 0x2000;
 306         kvm_debug("Installing KVM Exception handlers @ %p, %#x bytes\n",
 307                   gebase + offset,
 308                   mips32_GuestExceptionEnd - mips32_GuestException);
 309
 310         memcpy(gebase + offset, mips32_GuestException,
 311                mips32_GuestExceptionEnd - mips32_GuestException);
 312
 313         /* Invalidate the icache for these ranges */
 314         local_flush_icache_range((unsigned long)gebase,
 315                                 (unsigned long)gebase + ALIGN(size, PAGE_SIZE));
 316
 317         /*
 318          * Allocate comm page for guest kernel, a TLB will be reserved for
 319          * mapping GVA @ 0xFFFF8000 to this page
 320          */
 321         vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
 322
 323         if (!vcpu->arch.kseg0_commpage) {
 324                 err = -ENOMEM;
 325                 goto out_free_gebase;
 326         }
 327
 328         kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
 329         kvm_mips_commpage_init(vcpu);
 330
 331         /* Init */
 332         vcpu->arch.last_sched_cpu = -1;
 333
 334         /* Start off the timer */
 335         kvm_mips_init_count(vcpu);
 336
 337         return vcpu;
 338
 339 out_free_gebase:
 340         kfree(gebase);
 341
 342 out_free_cpu:
 343         kfree(vcpu);
 344
 345 out:
 346         return ERR_PTR(err);
 347 }
 348
 349 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 350 {
 351         hrtimer_cancel(&vcpu->arch.comparecount_timer);
 352
 353         kvm_vcpu_uninit(vcpu);
 354
 355         kvm_mips_dump_stats(vcpu);
 356
 357         kfree(vcpu->arch.guest_ebase);
 358         kfree(vcpu->arch.kseg0_commpage);
 359         kfree(vcpu);
 360 }
 361
 362 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 363 {
 364         kvm_arch_vcpu_free(vcpu);
 365 }
 366
 367 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 368                                         struct kvm_guest_debug *dbg)
 369 {
 370         return -ENOIOCTLCMD;
 371 }
 372
 373 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 374 {
 375         int r = 0;
 376         sigset_t sigsaved;
 377
 378         if (vcpu->sigset_active)
 379                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 380
 381         if (vcpu->mmio_needed) {
 382                 if (!vcpu->mmio_is_write)
 383                         kvm_mips_complete_mmio_load(vcpu, run);
 384                 vcpu->mmio_needed = 0;
 385         }
 386
 387         lose_fpu(1);
 388
 389         local_irq_disable();
 390         /* Check if we have any exceptions/interrupts pending */
 391         kvm_mips_deliver_interrupts(vcpu,
 392                                     kvm_read_c0_guest_cause(vcpu->arch.cop0));
 393
 394         kvm_guest_enter();
 395
 396         /* Disable hardware page table walking while in guest */
 397         htw_stop();
 398
 399         r = __kvm_mips_vcpu_run(run, vcpu);
 400
 401         /* Re-enable HTW before enabling interrupts */
 402         htw_start();
 403
 404         kvm_guest_exit();
 405         local_irq_enable();
 406
 407         if (vcpu->sigset_active)
 408                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 409
 410         return r;
 411 }
 412
 413 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
 414                              struct kvm_mips_interrupt *irq)
 415 {
 416         int intr = (int)irq->irq;
 417         struct kvm_vcpu *dvcpu = NULL;
 418
 419         if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
 420                 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
 421                           (int)intr);
 422
 423         if (irq->cpu == -1)
 424                 dvcpu = vcpu;
 425         else
 426                 dvcpu = vcpu->kvm->vcpus[irq->cpu];
 427
 428         if (intr == 2 || intr == 3 || intr == 4) {
 429                 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
 430
 431         } else if (intr == -2 || intr == -3 || intr == -4) {
 432                 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
 433         } else {
 434                 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
 435                         irq->cpu, irq->irq);
 436                 return -EINVAL;
 437         }
 438
 439         dvcpu->arch.wait = 0;
 440
 441         if (waitqueue_active(&dvcpu->wq))
 442                 wake_up_interruptible(&dvcpu->wq);
 443
 444         return 0;
 445 }
 446
 447 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 448                                     struct kvm_mp_state *mp_state)
 449 {
 450         return -ENOIOCTLCMD;
 451 }
 452
 453 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 454                                     struct kvm_mp_state *mp_state)
 455 {
 456         return -ENOIOCTLCMD;
 457 }
 458
 459 static u64 kvm_mips_get_one_regs[] = {
 460         KVM_REG_MIPS_R0,
 461         KVM_REG_MIPS_R1,
 462         KVM_REG_MIPS_R2,
 463         KVM_REG_MIPS_R3,
 464         KVM_REG_MIPS_R4,
 465         KVM_REG_MIPS_R5,
 466         KVM_REG_MIPS_R6,
 467         KVM_REG_MIPS_R7,
 468         KVM_REG_MIPS_R8,
 469         KVM_REG_MIPS_R9,
 470         KVM_REG_MIPS_R10,
 471         KVM_REG_MIPS_R11,
 472         KVM_REG_MIPS_R12,
 473         KVM_REG_MIPS_R13,
 474         KVM_REG_MIPS_R14,
 475         KVM_REG_MIPS_R15,
 476         KVM_REG_MIPS_R16,
 477         KVM_REG_MIPS_R17,
 478         KVM_REG_MIPS_R18,
 479         KVM_REG_MIPS_R19,
 480         KVM_REG_MIPS_R20,
 481         KVM_REG_MIPS_R21,
 482         KVM_REG_MIPS_R22,
 483         KVM_REG_MIPS_R23,
 484         KVM_REG_MIPS_R24,
 485         KVM_REG_MIPS_R25,
 486         KVM_REG_MIPS_R26,
 487         KVM_REG_MIPS_R27,
 488         KVM_REG_MIPS_R28,
 489         KVM_REG_MIPS_R29,
 490         KVM_REG_MIPS_R30,
 491         KVM_REG_MIPS_R31,
 492
 493         KVM_REG_MIPS_HI,
 494         KVM_REG_MIPS_LO,
 495         KVM_REG_MIPS_PC,
 496
 497         KVM_REG_MIPS_CP0_INDEX,
 498         KVM_REG_MIPS_CP0_CONTEXT,
 499         KVM_REG_MIPS_CP0_USERLOCAL,
 500         KVM_REG_MIPS_CP0_PAGEMASK,
 501         KVM_REG_MIPS_CP0_WIRED,
 502         KVM_REG_MIPS_CP0_HWRENA,
 503         KVM_REG_MIPS_CP0_BADVADDR,
 504         KVM_REG_MIPS_CP0_COUNT,
 505         KVM_REG_MIPS_CP0_ENTRYHI,
 506         KVM_REG_MIPS_CP0_COMPARE,
 507         KVM_REG_MIPS_CP0_STATUS,
 508         KVM_REG_MIPS_CP0_CAUSE,
 509         KVM_REG_MIPS_CP0_EPC,
 510         KVM_REG_MIPS_CP0_PRID,
 511         KVM_REG_MIPS_CP0_CONFIG,
 512         KVM_REG_MIPS_CP0_CONFIG1,
 513         KVM_REG_MIPS_CP0_CONFIG2,
 514         KVM_REG_MIPS_CP0_CONFIG3,
 515         KVM_REG_MIPS_CP0_CONFIG4,
 516         KVM_REG_MIPS_CP0_CONFIG5,
 517         KVM_REG_MIPS_CP0_CONFIG7,
 518         KVM_REG_MIPS_CP0_ERROREPC,
 519
 520         KVM_REG_MIPS_COUNT_CTL,
 521         KVM_REG_MIPS_COUNT_RESUME,
 522         KVM_REG_MIPS_COUNT_HZ,
 523 };
 524
 525 static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
 526                             const struct kvm_one_reg *reg)
 527 {
 528         struct mips_coproc *cop0 = vcpu->arch.cop0;
 529         struct mips_fpu_struct *fpu = &vcpu->arch.fpu;
 530         int ret;
 531         s64 v;
 532         unsigned int idx;
 533
 534         switch (reg->id) {
 535         /* General purpose registers */
 536         case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
 537                 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
 538                 break;
 539         case KVM_REG_MIPS_HI:
 540                 v = (long)vcpu->arch.hi;
 541                 break;
 542         case KVM_REG_MIPS_LO:
 543                 v = (long)vcpu->arch.lo;
 544                 break;
 545         case KVM_REG_MIPS_PC:
 546                 v = (long)vcpu->arch.pc;
 547                 break;
 548
 549         /* Floating point registers */
 550         case KVM_REG_MIPS_FPR_32(0) ... KVM_REG_MIPS_FPR_32(31):
 551                 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
 552                         return -EINVAL;
 553                 idx = reg->id - KVM_REG_MIPS_FPR_32(0);
 554                 /* Odd singles in top of even double when FR=0 */
 555                 if (kvm_read_c0_guest_status(cop0) & ST0_FR)
 556                         v = get_fpr32(&fpu->fpr[idx], 0);
 557                 else
 558                         v = get_fpr32(&fpu->fpr[idx & ~1], idx & 1);
 559                 break;
 560         case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31):
 561                 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
 562                         return -EINVAL;
 563                 idx = reg->id - KVM_REG_MIPS_FPR_64(0);
 564                 /* Can't access odd doubles in FR=0 mode */
 565                 if (idx & 1 && !(kvm_read_c0_guest_status(cop0) & ST0_FR))
 566                         return -EINVAL;
 567                 v = get_fpr64(&fpu->fpr[idx], 0);
 568                 break;
 569         case KVM_REG_MIPS_FCR_IR:
 570                 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
 571                         return -EINVAL;
 572                 v = boot_cpu_data.fpu_id;
 573                 break;
 574         case KVM_REG_MIPS_FCR_CSR:
 575                 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
 576                         return -EINVAL;
 577                 v = fpu->fcr31;
 578                 break;
 579
 580         /* Co-processor 0 registers */
 581         case KVM_REG_MIPS_CP0_INDEX:
 582                 v = (long)kvm_read_c0_guest_index(cop0);
 583                 break;
 584         case KVM_REG_MIPS_CP0_CONTEXT:
 585                 v = (long)kvm_read_c0_guest_context(cop0);
 586                 break;
 587         case KVM_REG_MIPS_CP0_USERLOCAL:
 588                 v = (long)kvm_read_c0_guest_userlocal(cop0);
 589                 break;
 590         case KVM_REG_MIPS_CP0_PAGEMASK:
 591                 v = (long)kvm_read_c0_guest_pagemask(cop0);
 592                 break;
 593         case KVM_REG_MIPS_CP0_WIRED:
 594                 v = (long)kvm_read_c0_guest_wired(cop0);
 595                 break;
 596         case KVM_REG_MIPS_CP0_HWRENA:
 597                 v = (long)kvm_read_c0_guest_hwrena(cop0);
 598                 break;
 599         case KVM_REG_MIPS_CP0_BADVADDR:
 600                 v = (long)kvm_read_c0_guest_badvaddr(cop0);
 601                 break;
 602         case KVM_REG_MIPS_CP0_ENTRYHI:
 603                 v = (long)kvm_read_c0_guest_entryhi(cop0);
 604                 break;
 605         case KVM_REG_MIPS_CP0_COMPARE:
 606                 v = (long)kvm_read_c0_guest_compare(cop0);
 607                 break;
 608         case KVM_REG_MIPS_CP0_STATUS:
 609                 v = (long)kvm_read_c0_guest_status(cop0);
 610                 break;
 611         case KVM_REG_MIPS_CP0_CAUSE:
 612                 v = (long)kvm_read_c0_guest_cause(cop0);
 613                 break;
 614         case KVM_REG_MIPS_CP0_EPC:
 615                 v = (long)kvm_read_c0_guest_epc(cop0);
 616                 break;
 617         case KVM_REG_MIPS_CP0_PRID:
 618                 v = (long)kvm_read_c0_guest_prid(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_CONFIG4:
 633                 v = (long)kvm_read_c0_guest_config4(cop0);
 634                 break;
 635         case KVM_REG_MIPS_CP0_CONFIG5:
 636                 v = (long)kvm_read_c0_guest_config5(cop0);
 637                 break;
 638         case KVM_REG_MIPS_CP0_CONFIG7:
 639                 v = (long)kvm_read_c0_guest_config7(cop0);
 640                 break;
 641         case KVM_REG_MIPS_CP0_ERROREPC:
 642                 v = (long)kvm_read_c0_guest_errorepc(cop0);
 643                 break;
 644         /* registers to be handled specially */
 645         case KVM_REG_MIPS_CP0_COUNT:
 646         case KVM_REG_MIPS_COUNT_CTL:
 647         case KVM_REG_MIPS_COUNT_RESUME:
 648         case KVM_REG_MIPS_COUNT_HZ:
 649                 ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v);
 650                 if (ret)
 651                         return ret;
 652                 break;
 653         default:
 654                 return -EINVAL;
 655         }
 656         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 657                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 658
 659                 return put_user(v, uaddr64);
 660         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 661                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 662                 u32 v32 = (u32)v;
 663
 664                 return put_user(v32, uaddr32);
 665         } else {
 666                 return -EINVAL;
 667         }
 668 }
 669
 670 static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
 671                             const struct kvm_one_reg *reg)
 672 {
 673         struct mips_coproc *cop0 = vcpu->arch.cop0;
 674         struct mips_fpu_struct *fpu = &vcpu->arch.fpu;
 675         s64 v;
 676         unsigned int idx;
 677
 678         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 679                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 680
 681                 if (get_user(v, uaddr64) != 0)
 682                         return -EFAULT;
 683         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 684                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 685                 s32 v32;
 686
 687                 if (get_user(v32, uaddr32) != 0)
 688                         return -EFAULT;
 689                 v = (s64)v32;
 690         } else {
 691                 return -EINVAL;
 692         }
 693
 694         switch (reg->id) {
 695         /* General purpose registers */
 696         case KVM_REG_MIPS_R0:
 697                 /* Silently ignore requests to set $0 */
 698                 break;
 699         case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
 700                 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
 701                 break;
 702         case KVM_REG_MIPS_HI:
 703                 vcpu->arch.hi = v;
 704                 break;
 705         case KVM_REG_MIPS_LO:
 706                 vcpu->arch.lo = v;
 707                 break;
 708         case KVM_REG_MIPS_PC:
 709                 vcpu->arch.pc = v;
 710                 break;
 711
 712         /* Floating point registers */
 713         case KVM_REG_MIPS_FPR_32(0) ... KVM_REG_MIPS_FPR_32(31):
 714                 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
 715                         return -EINVAL;
 716                 idx = reg->id - KVM_REG_MIPS_FPR_32(0);
 717                 /* Odd singles in top of even double when FR=0 */
 718                 if (kvm_read_c0_guest_status(cop0) & ST0_FR)
 719                         set_fpr32(&fpu->fpr[idx], 0, v);
 720                 else
 721                         set_fpr32(&fpu->fpr[idx & ~1], idx & 1, v);
 722                 break;
 723         case KVM_REG_MIPS_FPR_64(0) ... KVM_REG_MIPS_FPR_64(31):
 724                 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
 725                         return -EINVAL;
 726                 idx = reg->id - KVM_REG_MIPS_FPR_64(0);
 727                 /* Can't access odd doubles in FR=0 mode */
 728                 if (idx & 1 && !(kvm_read_c0_guest_status(cop0) & ST0_FR))
 729                         return -EINVAL;
 730                 set_fpr64(&fpu->fpr[idx], 0, v);
 731                 break;
 732         case KVM_REG_MIPS_FCR_IR:
 733                 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
 734                         return -EINVAL;
 735                 /* Read-only */
 736                 break;
 737         case KVM_REG_MIPS_FCR_CSR:
 738                 if (!kvm_mips_guest_has_fpu(&vcpu->arch))
 739                         return -EINVAL;
 740                 fpu->fcr31 = v;
 741                 break;
 742
 743         /* Co-processor 0 registers */
 744         case KVM_REG_MIPS_CP0_INDEX:
 745                 kvm_write_c0_guest_index(cop0, v);
 746                 break;
 747         case KVM_REG_MIPS_CP0_CONTEXT:
 748                 kvm_write_c0_guest_context(cop0, v);
 749                 break;
 750         case KVM_REG_MIPS_CP0_USERLOCAL:
 751                 kvm_write_c0_guest_userlocal(cop0, v);
 752                 break;
 753         case KVM_REG_MIPS_CP0_PAGEMASK:
 754                 kvm_write_c0_guest_pagemask(cop0, v);
 755                 break;
 756         case KVM_REG_MIPS_CP0_WIRED:
 757                 kvm_write_c0_guest_wired(cop0, v);
 758                 break;
 759         case KVM_REG_MIPS_CP0_HWRENA:
 760                 kvm_write_c0_guest_hwrena(cop0, v);
 761                 break;
 762         case KVM_REG_MIPS_CP0_BADVADDR:
 763                 kvm_write_c0_guest_badvaddr(cop0, v);
 764                 break;
 765         case KVM_REG_MIPS_CP0_ENTRYHI:
 766                 kvm_write_c0_guest_entryhi(cop0, v);
 767                 break;
 768         case KVM_REG_MIPS_CP0_STATUS:
 769                 kvm_write_c0_guest_status(cop0, v);
 770                 break;
 771         case KVM_REG_MIPS_CP0_EPC:
 772                 kvm_write_c0_guest_epc(cop0, v);
 773                 break;
 774         case KVM_REG_MIPS_CP0_PRID:
 775                 kvm_write_c0_guest_prid(cop0, v);
 776                 break;
 777         case KVM_REG_MIPS_CP0_ERROREPC:
 778                 kvm_write_c0_guest_errorepc(cop0, v);
 779                 break;
 780         /* registers to be handled specially */
 781         case KVM_REG_MIPS_CP0_COUNT:
 782         case KVM_REG_MIPS_CP0_COMPARE:
 783         case KVM_REG_MIPS_CP0_CAUSE:
 784         case KVM_REG_MIPS_CP0_CONFIG:
 785         case KVM_REG_MIPS_CP0_CONFIG1:
 786         case KVM_REG_MIPS_CP0_CONFIG2:
 787         case KVM_REG_MIPS_CP0_CONFIG3:
 788         case KVM_REG_MIPS_CP0_CONFIG4:
 789         case KVM_REG_MIPS_CP0_CONFIG5:
 790         case KVM_REG_MIPS_COUNT_CTL:
 791         case KVM_REG_MIPS_COUNT_RESUME:
 792         case KVM_REG_MIPS_COUNT_HZ:
 793                 return kvm_mips_callbacks->set_one_reg(vcpu, reg, v);
 794         default:
 795                 return -EINVAL;
 796         }
 797         return 0;
 798 }
 799
 800 long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,
 801                          unsigned long arg)
 802 {
 803         struct kvm_vcpu *vcpu = filp->private_data;
 804         void __user *argp = (void __user *)arg;
 805         long r;
 806
 807         switch (ioctl) {
 808         case KVM_SET_ONE_REG:
 809         case KVM_GET_ONE_REG: {
 810                 struct kvm_one_reg reg;
 811
 812                 if (copy_from_user(&reg, argp, sizeof(reg)))
 813                         return -EFAULT;
 814                 if (ioctl == KVM_SET_ONE_REG)
 815                         return kvm_mips_set_reg(vcpu, &reg);
 816                 else
 817                         return kvm_mips_get_reg(vcpu, &reg);
 818         }
 819         case KVM_GET_REG_LIST: {
 820                 struct kvm_reg_list __user *user_list = argp;
 821                 u64 __user *reg_dest;
 822                 struct kvm_reg_list reg_list;
 823                 unsigned n;
 824
 825                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 826                         return -EFAULT;
 827                 n = reg_list.n;
 828                 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
 829                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 830                         return -EFAULT;
 831                 if (n < reg_list.n)
 832                         return -E2BIG;
 833                 reg_dest = user_list->reg;
 834                 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
 835                                  sizeof(kvm_mips_get_one_regs)))
 836                         return -EFAULT;
 837                 return 0;
 838         }
 839         case KVM_NMI:
 840                 /* Treat the NMI as a CPU reset */
 841                 r = kvm_mips_reset_vcpu(vcpu);
 842                 break;
 843         case KVM_INTERRUPT:
 844                 {
 845                         struct kvm_mips_interrupt irq;
 846
 847                         r = -EFAULT;
 848                         if (copy_from_user(&irq, argp, sizeof(irq)))
 849                                 goto out;
 850
 851                         kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
 852                                   irq.irq);
 853
 854                         r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 855                         break;
 856                 }
 857         default:
 858                 r = -ENOIOCTLCMD;
 859         }
 860
 861 out:
 862         return r;
 863 }
 864
 865 /* Get (and clear) the dirty memory log for a memory slot. */
 866 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 867 {
 868         struct kvm_memory_slot *memslot;
 869         unsigned long ga, ga_end;
 870         int is_dirty = 0;
 871         int r;
 872         unsigned long n;
 873
 874         mutex_lock(&kvm->slots_lock);
 875
 876         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 877         if (r)
 878                 goto out;
 879
 880         /* If nothing is dirty, don't bother messing with page tables. */
 881         if (is_dirty) {
 882                 memslot = &kvm->memslots->memslots[log->slot];
 883
 884                 ga = memslot->base_gfn << PAGE_SHIFT;
 885                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
 886
 887                 kvm_info("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
 888                          ga_end);
 889
 890                 n = kvm_dirty_bitmap_bytes(memslot);
 891                 memset(memslot->dirty_bitmap, 0, n);
 892         }
 893
 894         r = 0;
 895 out:
 896         mutex_unlock(&kvm->slots_lock);
 897         return r;
 898
 899 }
 900
 901 long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 902 {
 903         long r;
 904
 905         switch (ioctl) {
 906         default:
 907                 r = -ENOIOCTLCMD;
 908         }
 909
 910         return r;
 911 }
 912
 913 int kvm_arch_init(void *opaque)
 914 {
 915         if (kvm_mips_callbacks) {
 916                 kvm_err("kvm: module already exists\n");
 917                 return -EEXIST;
 918         }
 919
 920         return kvm_mips_emulation_init(&kvm_mips_callbacks);
 921 }
 922
 923 void kvm_arch_exit(void)
 924 {
 925         kvm_mips_callbacks = NULL;
 926 }
 927
 928 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 929                                   struct kvm_sregs *sregs)
 930 {
 931         return -ENOIOCTLCMD;
 932 }
 933
 934 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 935                                   struct kvm_sregs *sregs)
 936 {
 937         return -ENOIOCTLCMD;
 938 }
 939
 940 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 941 {
 942 }
 943
 944 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 945 {
 946         return -ENOIOCTLCMD;
 947 }
 948
 949 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 950 {
 951         return -ENOIOCTLCMD;
 952 }
 953
 954 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 955 {
 956         return VM_FAULT_SIGBUS;
 957 }
 958
 959 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 960 {
 961         int r;
 962
 963         switch (ext) {
 964         case KVM_CAP_ONE_REG:
 965                 r = 1;
 966                 break;
 967         case KVM_CAP_COALESCED_MMIO:
 968                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 969                 break;
 970         default:
 971                 r = 0;
 972                 break;
 973         }
 974         return r;
 975 }
 976
 977 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 978 {
 979         return kvm_mips_pending_timer(vcpu);
 980 }
 981
 982 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
 983 {
 984         int i;
 985         struct mips_coproc *cop0;
 986
 987         if (!vcpu)
 988                 return -1;
 989
 990         kvm_debug("VCPU Register Dump:\n");
 991         kvm_debug("\tpc = 0x%08lx\n", vcpu->arch.pc);
 992         kvm_debug("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
 993
 994         for (i = 0; i < 32; i += 4) {
 995                 kvm_debug("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
 996                        vcpu->arch.gprs[i],
 997                        vcpu->arch.gprs[i + 1],
 998                        vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
 999         }
1000         kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi);
1001         kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo);
1002
1003         cop0 = vcpu->arch.cop0;
1004         kvm_debug("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
1005                   kvm_read_c0_guest_status(cop0),
1006                   kvm_read_c0_guest_cause(cop0));
1007
1008         kvm_debug("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
1009
1010         return 0;
1011 }
1012
1013 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
1014 {
1015         int i;
1016
1017         for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
1018                 vcpu->arch.gprs[i] = regs->gpr[i];
1019         vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
1020         vcpu->arch.hi = regs->hi;
1021         vcpu->arch.lo = regs->lo;
1022         vcpu->arch.pc = regs->pc;
1023
1024         return 0;
1025 }
1026
1027 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
1028 {
1029         int i;
1030
1031         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
1032                 regs->gpr[i] = vcpu->arch.gprs[i];
1033
1034         regs->hi = vcpu->arch.hi;
1035         regs->lo = vcpu->arch.lo;
1036         regs->pc = vcpu->arch.pc;
1037
1038         return 0;
1039 }
1040
1041 static void kvm_mips_comparecount_func(unsigned long data)
1042 {
1043         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
1044
1045         kvm_mips_callbacks->queue_timer_int(vcpu);
1046
1047         vcpu->arch.wait = 0;
1048         if (waitqueue_active(&vcpu->wq))
1049                 wake_up_interruptible(&vcpu->wq);
1050 }
1051
1052 /* low level hrtimer wake routine */
1053 static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
1054 {
1055         struct kvm_vcpu *vcpu;
1056
1057         vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
1058         kvm_mips_comparecount_func((unsigned long) vcpu);
1059         return kvm_mips_count_timeout(vcpu);
1060 }
1061
1062 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
1063 {
1064         kvm_mips_callbacks->vcpu_init(vcpu);
1065         hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
1066                      HRTIMER_MODE_REL);
1067         vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
1068         return 0;
1069 }
1070
1071 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1072                                   struct kvm_translation *tr)
1073 {
1074         return 0;
1075 }
1076
1077 /* Initial guest state */
1078 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1079 {
1080         return kvm_mips_callbacks->vcpu_setup(vcpu);
1081 }
1082
1083 static void kvm_mips_set_c0_status(void)
1084 {
1085         uint32_t status = read_c0_status();
1086
1087         if (cpu_has_dsp)
1088                 status |= (ST0_MX);
1089
1090         write_c0_status(status);
1091         ehb();
1092 }
1093
1094 /*
1095  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
1096  */
1097 int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1098 {
1099         uint32_t cause = vcpu->arch.host_cp0_cause;
1100         uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
1101         uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
1102         unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
1103         enum emulation_result er = EMULATE_DONE;
1104         int ret = RESUME_GUEST;
1105
1106         /* re-enable HTW before enabling interrupts */
1107         htw_start();
1108
1109         /* Set a default exit reason */
1110         run->exit_reason = KVM_EXIT_UNKNOWN;
1111         run->ready_for_interrupt_injection = 1;
1112
1113         /*
1114          * Set the appropriate status bits based on host CPU features,
1115          * before we hit the scheduler
1116          */
1117         kvm_mips_set_c0_status();
1118
1119         local_irq_enable();
1120
1121         kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
1122                         cause, opc, run, vcpu);
1123
1124         /*
1125          * Do a privilege check, if in UM most of these exit conditions end up
1126          * causing an exception to be delivered to the Guest Kernel
1127          */
1128         er = kvm_mips_check_privilege(cause, opc, run, vcpu);
1129         if (er == EMULATE_PRIV_FAIL) {
1130                 goto skip_emul;
1131         } else if (er == EMULATE_FAIL) {
1132                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1133                 ret = RESUME_HOST;
1134                 goto skip_emul;
1135         }
1136
1137         switch (exccode) {
1138         case T_INT:
1139                 kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc);
1140
1141                 ++vcpu->stat.int_exits;
1142                 trace_kvm_exit(vcpu, INT_EXITS);
1143
1144                 if (need_resched())
1145                         cond_resched();
1146
1147                 ret = RESUME_GUEST;
1148                 break;
1149
1150         case T_COP_UNUSABLE:
1151                 kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
1152
1153                 ++vcpu->stat.cop_unusable_exits;
1154                 trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
1155                 ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
1156                 /* XXXKYMA: Might need to return to user space */
1157                 if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN)
1158                         ret = RESUME_HOST;
1159                 break;
1160
1161         case T_TLB_MOD:
1162                 ++vcpu->stat.tlbmod_exits;
1163                 trace_kvm_exit(vcpu, TLBMOD_EXITS);
1164                 ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
1165                 break;
1166
1167         case T_TLB_ST_MISS:
1168                 kvm_debug("TLB ST fault:  cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
1169                           cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
1170                           badvaddr);
1171
1172                 ++vcpu->stat.tlbmiss_st_exits;
1173                 trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
1174                 ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
1175                 break;
1176
1177         case T_TLB_LD_MISS:
1178                 kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
1179                           cause, opc, badvaddr);
1180
1181                 ++vcpu->stat.tlbmiss_ld_exits;
1182                 trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
1183                 ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
1184                 break;
1185
1186         case T_ADDR_ERR_ST:
1187                 ++vcpu->stat.addrerr_st_exits;
1188                 trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
1189                 ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
1190                 break;
1191
1192         case T_ADDR_ERR_LD:
1193                 ++vcpu->stat.addrerr_ld_exits;
1194                 trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
1195                 ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
1196                 break;
1197
1198         case T_SYSCALL:
1199                 ++vcpu->stat.syscall_exits;
1200                 trace_kvm_exit(vcpu, SYSCALL_EXITS);
1201                 ret = kvm_mips_callbacks->handle_syscall(vcpu);
1202                 break;
1203
1204         case T_RES_INST:
1205                 ++vcpu->stat.resvd_inst_exits;
1206                 trace_kvm_exit(vcpu, RESVD_INST_EXITS);
1207                 ret = kvm_mips_callbacks->handle_res_inst(vcpu);
1208                 break;
1209
1210         case T_BREAK:
1211                 ++vcpu->stat.break_inst_exits;
1212                 trace_kvm_exit(vcpu, BREAK_INST_EXITS);
1213                 ret = kvm_mips_callbacks->handle_break(vcpu);
1214                 break;
1215
1216         case T_TRAP:
1217                 ++vcpu->stat.trap_inst_exits;
1218                 trace_kvm_exit(vcpu, TRAP_INST_EXITS);
1219                 ret = kvm_mips_callbacks->handle_trap(vcpu);
1220                 break;
1221
1222         case T_FPE:
1223                 ++vcpu->stat.fpe_exits;
1224                 trace_kvm_exit(vcpu, FPE_EXITS);
1225                 ret = kvm_mips_callbacks->handle_fpe(vcpu);
1226                 break;
1227
1228         case T_MSADIS:
1229                 ret = kvm_mips_callbacks->handle_msa_disabled(vcpu);
1230                 break;
1231
1232         default:
1233                 kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x  BadVaddr: %#lx Status: %#lx\n",
1234                         exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
1235                         kvm_read_c0_guest_status(vcpu->arch.cop0));
1236                 kvm_arch_vcpu_dump_regs(vcpu);
1237                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1238                 ret = RESUME_HOST;
1239                 break;
1240
1241         }
1242
1243 skip_emul:
1244         local_irq_disable();
1245
1246         if (er == EMULATE_DONE && !(ret & RESUME_HOST))
1247                 kvm_mips_deliver_interrupts(vcpu, cause);
1248
1249         if (!(ret & RESUME_HOST)) {
1250                 /* Only check for signals if not already exiting to userspace */
1251                 if (signal_pending(current)) {
1252                         run->exit_reason = KVM_EXIT_INTR;
1253                         ret = (-EINTR << 2) | RESUME_HOST;
1254                         ++vcpu->stat.signal_exits;
1255                         trace_kvm_exit(vcpu, SIGNAL_EXITS);
1256                 }
1257         }
1258
1259         if (ret == RESUME_GUEST) {
1260                 /*
1261                  * If FPU is enabled (i.e. the guest's FPU context is live),
1262                  * restore FCR31.
1263                  *
1264                  * This should be before returning to the guest exception
1265                  * vector, as it may well cause an FP exception if there are
1266                  * pending exception bits unmasked. (see
1267                  * kvm_mips_csr_die_notifier() for how that is handled).
1268                  */
1269                 if (kvm_mips_guest_has_fpu(&vcpu->arch) &&
1270                     read_c0_status() & ST0_CU1)
1271                         __kvm_restore_fcsr(&vcpu->arch);
1272         }
1273
1274         /* Disable HTW before returning to guest or host */
1275         htw_stop();
1276
1277         return ret;
1278 }
1279
1280 /* Enable FPU for guest and restore context */
1281 void kvm_own_fpu(struct kvm_vcpu *vcpu)
1282 {
1283         struct mips_coproc *cop0 = vcpu->arch.cop0;
1284         unsigned int sr, cfg5;
1285
1286         preempt_disable();
1287
1288         /*
1289          * Enable FPU for guest
1290          * We set FR and FRE according to guest context
1291          */
1292         sr = kvm_read_c0_guest_status(cop0);
1293         change_c0_status(ST0_CU1 | ST0_FR, sr);
1294         if (cpu_has_fre) {
1295                 cfg5 = kvm_read_c0_guest_config5(cop0);
1296                 change_c0_config5(MIPS_CONF5_FRE, cfg5);
1297         }
1298         enable_fpu_hazard();
1299
1300         /* If guest FPU state not active, restore it now */
1301         if (!(vcpu->arch.fpu_inuse & KVM_MIPS_FPU_FPU)) {
1302                 __kvm_restore_fpu(&vcpu->arch);
1303                 vcpu->arch.fpu_inuse |= KVM_MIPS_FPU_FPU;
1304         }
1305
1306         preempt_enable();
1307 }
1308
1309 /* Drop FPU without saving it */
1310 void kvm_drop_fpu(struct kvm_vcpu *vcpu)
1311 {
1312         preempt_disable();
1313         if (vcpu->arch.fpu_inuse & KVM_MIPS_FPU_FPU) {
1314                 clear_c0_status(ST0_CU1 | ST0_FR);
1315                 vcpu->arch.fpu_inuse &= ~KVM_MIPS_FPU_FPU;
1316         }
1317         preempt_enable();
1318 }
1319
1320 /* Save and disable FPU */
1321 void kvm_lose_fpu(struct kvm_vcpu *vcpu)
1322 {
1323         /*
1324          * FPU gets disabled in root context (hardware) when it is disabled in
1325          * guest context (software), but the register state in the hardware may
1326          * still be in use. This is why we explicitly re-enable the hardware
1327          * before saving.
1328          */
1329
1330         preempt_disable();
1331         if (vcpu->arch.fpu_inuse & KVM_MIPS_FPU_FPU) {
1332                 set_c0_status(ST0_CU1);
1333                 enable_fpu_hazard();
1334
1335                 __kvm_save_fpu(&vcpu->arch);
1336                 vcpu->arch.fpu_inuse &= ~KVM_MIPS_FPU_FPU;
1337
1338                 /* Disable FPU */
1339                 clear_c0_status(ST0_CU1 | ST0_FR);
1340         }
1341         preempt_enable();
1342 }
1343
1344 /*
1345  * Step over a specific ctc1 to FCSR which is used to restore guest FCSR state
1346  * and may trigger a "harmless" FP exception if cause bits are set in the value
1347  * being written.
1348  */
1349 static int kvm_mips_csr_die_notify(struct notifier_block *self,
1350                                    unsigned long cmd, void *ptr)
1351 {
1352         struct die_args *args = (struct die_args *)ptr;
1353         struct pt_regs *regs = args->regs;
1354         unsigned long pc;
1355
1356         /* Only interested in FPE */
1357         if (cmd != DIE_FP)
1358                 return NOTIFY_DONE;
1359
1360         /* Return immediately if guest context isn't active */
1361         if (!(current->flags & PF_VCPU))
1362                 return NOTIFY_DONE;
1363
1364         /* Should never get here from user mode */
1365         BUG_ON(user_mode(regs));
1366
1367         pc = instruction_pointer(regs);
1368         switch (cmd) {
1369         case DIE_FP:
1370                 /* match 2nd instruction in __kvm_restore_fcsr */
1371                 if (pc != (unsigned long)&__kvm_restore_fcsr + 4)
1372                         return NOTIFY_DONE;
1373                 break;
1374         }
1375
1376         /* Move PC forward a little and continue executing */
1377         instruction_pointer(regs) += 4;
1378
1379         return NOTIFY_STOP;
1380 }
1381
1382 static struct notifier_block kvm_mips_csr_die_notifier = {
1383         .notifier_call = kvm_mips_csr_die_notify,
1384 };
1385
1386 int __init kvm_mips_init(void)
1387 {
1388         int ret;
1389
1390         ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1391
1392         if (ret)
1393                 return ret;
1394
1395         register_die_notifier(&kvm_mips_csr_die_notifier);
1396
1397         /*
1398          * On MIPS, kernel modules are executed from "mapped space", which
1399          * requires TLBs. The TLB handling code is statically linked with
1400          * the rest of the kernel (tlb.c) to avoid the possibility of
1401          * double faulting. The issue is that the TLB code references
1402          * routines that are part of the the KVM module, which are only
1403          * available once the module is loaded.
1404          */
1405         kvm_mips_gfn_to_pfn = gfn_to_pfn;
1406         kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
1407         kvm_mips_is_error_pfn = is_error_pfn;
1408
1409         return 0;
1410 }
1411
1412 void __exit kvm_mips_exit(void)
1413 {
1414         kvm_exit();
1415
1416         kvm_mips_gfn_to_pfn = NULL;
1417         kvm_mips_release_pfn_clean = NULL;
1418         kvm_mips_is_error_pfn = NULL;
1419
1420         unregister_die_notifier(&kvm_mips_csr_die_notifier);
1421 }
1422
1423 module_init(kvm_mips_init);
1424 module_exit(kvm_mips_exit);
1425
1426 EXPORT_TRACEPOINT_SYMBOL(kvm_exit);