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 /* XXXKYMA: We are simulatoring a processor that has the WII bit set in Config7, so we
  65  * are "runnable" if interrupts are pending
  66  */
  67 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
  68 {
  69         return !!(vcpu->arch.pending_exceptions);
  70 }
  71
  72 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  73 {
  74         return 1;
  75 }
  76
  77 int kvm_arch_hardware_enable(void *garbage)
  78 {
  79         return 0;
  80 }
  81
  82 void kvm_arch_hardware_disable(void *garbage)
  83 {
  84 }
  85
  86 int kvm_arch_hardware_setup(void)
  87 {
  88         return 0;
  89 }
  90
  91 void kvm_arch_hardware_unsetup(void)
  92 {
  93 }
  94
  95 void kvm_arch_check_processor_compat(void *rtn)
  96 {
  97         int *r = (int *)rtn;
  98         *r = 0;
  99         return;
 100 }
 101
 102 static void kvm_mips_init_tlbs(struct kvm *kvm)
 103 {
 104         unsigned long wired;
 105
 106         /* Add a wired entry to the TLB, it is used to map the commpage to the Guest kernel */
 107         wired = read_c0_wired();
 108         write_c0_wired(wired + 1);
 109         mtc0_tlbw_hazard();
 110         kvm->arch.commpage_tlb = wired;
 111
 112         kvm_debug("[%d] commpage TLB: %d\n", smp_processor_id(),
 113                   kvm->arch.commpage_tlb);
 114 }
 115
 116 static void kvm_mips_init_vm_percpu(void *arg)
 117 {
 118         struct kvm *kvm = (struct kvm *)arg;
 119
 120         kvm_mips_init_tlbs(kvm);
 121         kvm_mips_callbacks->vm_init(kvm);
 122
 123 }
 124
 125 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 126 {
 127         if (atomic_inc_return(&kvm_mips_instance) == 1) {
 128                 kvm_debug("%s: 1st KVM instance, setup host TLB parameters\n",
 129                           __func__);
 130                 on_each_cpu(kvm_mips_init_vm_percpu, kvm, 1);
 131         }
 132
 133
 134         return 0;
 135 }
 136
 137 void kvm_mips_free_vcpus(struct kvm *kvm)
 138 {
 139         unsigned int i;
 140         struct kvm_vcpu *vcpu;
 141
 142         /* Put the pages we reserved for the guest pmap */
 143         for (i = 0; i < kvm->arch.guest_pmap_npages; i++) {
 144                 if (kvm->arch.guest_pmap[i] != KVM_INVALID_PAGE)
 145                         kvm_mips_release_pfn_clean(kvm->arch.guest_pmap[i]);
 146         }
 147         kfree(kvm->arch.guest_pmap);
 148
 149         kvm_for_each_vcpu(i, vcpu, kvm) {
 150                 kvm_arch_vcpu_free(vcpu);
 151         }
 152
 153         mutex_lock(&kvm->lock);
 154
 155         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 156                 kvm->vcpus[i] = NULL;
 157
 158         atomic_set(&kvm->online_vcpus, 0);
 159
 160         mutex_unlock(&kvm->lock);
 161 }
 162
 163 void kvm_arch_sync_events(struct kvm *kvm)
 164 {
 165 }
 166
 167 static void kvm_mips_uninit_tlbs(void *arg)
 168 {
 169         /* Restore wired count */
 170         write_c0_wired(0);
 171         mtc0_tlbw_hazard();
 172         /* Clear out all the TLBs */
 173         kvm_local_flush_tlb_all();
 174 }
 175
 176 void kvm_arch_destroy_vm(struct kvm *kvm)
 177 {
 178         kvm_mips_free_vcpus(kvm);
 179
 180         /* If this is the last instance, restore wired count */
 181         if (atomic_dec_return(&kvm_mips_instance) == 0) {
 182                 kvm_debug("%s: last KVM instance, restoring TLB parameters\n",
 183                           __func__);
 184                 on_each_cpu(kvm_mips_uninit_tlbs, NULL, 1);
 185         }
 186 }
 187
 188 long
 189 kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 190 {
 191         return -ENOIOCTLCMD;
 192 }
 193
 194 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
 195                            struct kvm_memory_slot *dont)
 196 {
 197 }
 198
 199 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
 200                             unsigned long npages)
 201 {
 202         return 0;
 203 }
 204
 205 void kvm_arch_memslots_updated(struct kvm *kvm)
 206 {
 207 }
 208
 209 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 210                                 struct kvm_memory_slot *memslot,
 211                                 struct kvm_userspace_memory_region *mem,
 212                                 enum kvm_mr_change change)
 213 {
 214         return 0;
 215 }
 216
 217 void kvm_arch_commit_memory_region(struct kvm *kvm,
 218                                 struct kvm_userspace_memory_region *mem,
 219                                 const struct kvm_memory_slot *old,
 220                                 enum kvm_mr_change change)
 221 {
 222         unsigned long npages = 0;
 223         int i, err = 0;
 224
 225         kvm_debug("%s: kvm: %p slot: %d, GPA: %llx, size: %llx, QVA: %llx\n",
 226                   __func__, kvm, mem->slot, mem->guest_phys_addr,
 227                   mem->memory_size, mem->userspace_addr);
 228
 229         /* Setup Guest PMAP table */
 230         if (!kvm->arch.guest_pmap) {
 231                 if (mem->slot == 0)
 232                         npages = mem->memory_size >> PAGE_SHIFT;
 233
 234                 if (npages) {
 235                         kvm->arch.guest_pmap_npages = npages;
 236                         kvm->arch.guest_pmap =
 237                             kzalloc(npages * sizeof(unsigned long), GFP_KERNEL);
 238
 239                         if (!kvm->arch.guest_pmap) {
 240                                 kvm_err("Failed to allocate guest PMAP");
 241                                 err = -ENOMEM;
 242                                 goto out;
 243                         }
 244
 245                         kvm_debug("Allocated space for Guest PMAP Table (%ld pages) @ %p\n",
 246                                   npages, kvm->arch.guest_pmap);
 247
 248                         /* Now setup the page table */
 249                         for (i = 0; i < npages; i++) {
 250                                 kvm->arch.guest_pmap[i] = KVM_INVALID_PAGE;
 251                         }
 252                 }
 253         }
 254 out:
 255         return;
 256 }
 257
 258 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 259 {
 260 }
 261
 262 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 263                                    struct kvm_memory_slot *slot)
 264 {
 265 }
 266
 267 void kvm_arch_flush_shadow(struct kvm *kvm)
 268 {
 269 }
 270
 271 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 272 {
 273         extern char mips32_exception[], mips32_exceptionEnd[];
 274         extern char mips32_GuestException[], mips32_GuestExceptionEnd[];
 275         int err, size, offset;
 276         void *gebase;
 277         int i;
 278
 279         struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
 280
 281         if (!vcpu) {
 282                 err = -ENOMEM;
 283                 goto out;
 284         }
 285
 286         err = kvm_vcpu_init(vcpu, kvm, id);
 287
 288         if (err)
 289                 goto out_free_cpu;
 290
 291         kvm_debug("kvm @ %p: create cpu %d at %p\n", kvm, id, vcpu);
 292
 293         /* Allocate space for host mode exception handlers that handle
 294          * guest mode exits
 295          */
 296         if (cpu_has_veic || cpu_has_vint) {
 297                 size = 0x200 + VECTORSPACING * 64;
 298         } else {
 299                 size = 0x4000;
 300         }
 301
 302         /* Save Linux EBASE */
 303         vcpu->arch.host_ebase = (void *)read_c0_ebase();
 304
 305         gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL);
 306
 307         if (!gebase) {
 308                 err = -ENOMEM;
 309                 goto out_free_cpu;
 310         }
 311         kvm_debug("Allocated %d bytes for KVM Exception Handlers @ %p\n",
 312                   ALIGN(size, PAGE_SIZE), gebase);
 313
 314         /* Save new ebase */
 315         vcpu->arch.guest_ebase = gebase;
 316
 317         /* Copy L1 Guest Exception handler to correct offset */
 318
 319         /* TLB Refill, EXL = 0 */
 320         memcpy(gebase, mips32_exception,
 321                mips32_exceptionEnd - mips32_exception);
 322
 323         /* General Exception Entry point */
 324         memcpy(gebase + 0x180, mips32_exception,
 325                mips32_exceptionEnd - mips32_exception);
 326
 327         /* For vectored interrupts poke the exception code @ all offsets 0-7 */
 328         for (i = 0; i < 8; i++) {
 329                 kvm_debug("L1 Vectored handler @ %p\n",
 330                           gebase + 0x200 + (i * VECTORSPACING));
 331                 memcpy(gebase + 0x200 + (i * VECTORSPACING), mips32_exception,
 332                        mips32_exceptionEnd - mips32_exception);
 333         }
 334
 335         /* General handler, relocate to unmapped space for sanity's sake */
 336         offset = 0x2000;
 337         kvm_debug("Installing KVM Exception handlers @ %p, %#x bytes\n",
 338                   gebase + offset,
 339                   mips32_GuestExceptionEnd - mips32_GuestException);
 340
 341         memcpy(gebase + offset, mips32_GuestException,
 342                mips32_GuestExceptionEnd - mips32_GuestException);
 343
 344         /* Invalidate the icache for these ranges */
 345         local_flush_icache_range((unsigned long)gebase,
 346                                 (unsigned long)gebase + ALIGN(size, PAGE_SIZE));
 347
 348         /* Allocate comm page for guest kernel, a TLB will be reserved for mapping GVA @ 0xFFFF8000 to this page */
 349         vcpu->arch.kseg0_commpage = kzalloc(PAGE_SIZE << 1, GFP_KERNEL);
 350
 351         if (!vcpu->arch.kseg0_commpage) {
 352                 err = -ENOMEM;
 353                 goto out_free_gebase;
 354         }
 355
 356         kvm_debug("Allocated COMM page @ %p\n", vcpu->arch.kseg0_commpage);
 357         kvm_mips_commpage_init(vcpu);
 358
 359         /* Init */
 360         vcpu->arch.last_sched_cpu = -1;
 361
 362         /* Start off the timer */
 363         kvm_mips_init_count(vcpu);
 364
 365         return vcpu;
 366
 367 out_free_gebase:
 368         kfree(gebase);
 369
 370 out_free_cpu:
 371         kfree(vcpu);
 372
 373 out:
 374         return ERR_PTR(err);
 375 }
 376
 377 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 378 {
 379         hrtimer_cancel(&vcpu->arch.comparecount_timer);
 380
 381         kvm_vcpu_uninit(vcpu);
 382
 383         kvm_mips_dump_stats(vcpu);
 384
 385         kfree(vcpu->arch.guest_ebase);
 386         kfree(vcpu->arch.kseg0_commpage);
 387 }
 388
 389 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 390 {
 391         kvm_arch_vcpu_free(vcpu);
 392 }
 393
 394 int
 395 kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 396                                     struct kvm_guest_debug *dbg)
 397 {
 398         return -ENOIOCTLCMD;
 399 }
 400
 401 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 402 {
 403         int r = 0;
 404         sigset_t sigsaved;
 405
 406         if (vcpu->sigset_active)
 407                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 408
 409         if (vcpu->mmio_needed) {
 410                 if (!vcpu->mmio_is_write)
 411                         kvm_mips_complete_mmio_load(vcpu, run);
 412                 vcpu->mmio_needed = 0;
 413         }
 414
 415         local_irq_disable();
 416         /* Check if we have any exceptions/interrupts pending */
 417         kvm_mips_deliver_interrupts(vcpu,
 418                                     kvm_read_c0_guest_cause(vcpu->arch.cop0));
 419
 420         kvm_guest_enter();
 421
 422         r = __kvm_mips_vcpu_run(run, vcpu);
 423
 424         kvm_guest_exit();
 425         local_irq_enable();
 426
 427         if (vcpu->sigset_active)
 428                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 429
 430         return r;
 431 }
 432
 433 int
 434 kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
 435 {
 436         int intr = (int)irq->irq;
 437         struct kvm_vcpu *dvcpu = NULL;
 438
 439         if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
 440                 kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
 441                           (int)intr);
 442
 443         if (irq->cpu == -1)
 444                 dvcpu = vcpu;
 445         else
 446                 dvcpu = vcpu->kvm->vcpus[irq->cpu];
 447
 448         if (intr == 2 || intr == 3 || intr == 4) {
 449                 kvm_mips_callbacks->queue_io_int(dvcpu, irq);
 450
 451         } else if (intr == -2 || intr == -3 || intr == -4) {
 452                 kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
 453         } else {
 454                 kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
 455                         irq->cpu, irq->irq);
 456                 return -EINVAL;
 457         }
 458
 459         dvcpu->arch.wait = 0;
 460
 461         if (waitqueue_active(&dvcpu->wq)) {
 462                 wake_up_interruptible(&dvcpu->wq);
 463         }
 464
 465         return 0;
 466 }
 467
 468 int
 469 kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 470                                 struct kvm_mp_state *mp_state)
 471 {
 472         return -ENOIOCTLCMD;
 473 }
 474
 475 int
 476 kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 477                                 struct kvm_mp_state *mp_state)
 478 {
 479         return -ENOIOCTLCMD;
 480 }
 481
 482 static u64 kvm_mips_get_one_regs[] = {
 483         KVM_REG_MIPS_R0,
 484         KVM_REG_MIPS_R1,
 485         KVM_REG_MIPS_R2,
 486         KVM_REG_MIPS_R3,
 487         KVM_REG_MIPS_R4,
 488         KVM_REG_MIPS_R5,
 489         KVM_REG_MIPS_R6,
 490         KVM_REG_MIPS_R7,
 491         KVM_REG_MIPS_R8,
 492         KVM_REG_MIPS_R9,
 493         KVM_REG_MIPS_R10,
 494         KVM_REG_MIPS_R11,
 495         KVM_REG_MIPS_R12,
 496         KVM_REG_MIPS_R13,
 497         KVM_REG_MIPS_R14,
 498         KVM_REG_MIPS_R15,
 499         KVM_REG_MIPS_R16,
 500         KVM_REG_MIPS_R17,
 501         KVM_REG_MIPS_R18,
 502         KVM_REG_MIPS_R19,
 503         KVM_REG_MIPS_R20,
 504         KVM_REG_MIPS_R21,
 505         KVM_REG_MIPS_R22,
 506         KVM_REG_MIPS_R23,
 507         KVM_REG_MIPS_R24,
 508         KVM_REG_MIPS_R25,
 509         KVM_REG_MIPS_R26,
 510         KVM_REG_MIPS_R27,
 511         KVM_REG_MIPS_R28,
 512         KVM_REG_MIPS_R29,
 513         KVM_REG_MIPS_R30,
 514         KVM_REG_MIPS_R31,
 515
 516         KVM_REG_MIPS_HI,
 517         KVM_REG_MIPS_LO,
 518         KVM_REG_MIPS_PC,
 519
 520         KVM_REG_MIPS_CP0_INDEX,
 521         KVM_REG_MIPS_CP0_CONTEXT,
 522         KVM_REG_MIPS_CP0_USERLOCAL,
 523         KVM_REG_MIPS_CP0_PAGEMASK,
 524         KVM_REG_MIPS_CP0_WIRED,
 525         KVM_REG_MIPS_CP0_HWRENA,
 526         KVM_REG_MIPS_CP0_BADVADDR,
 527         KVM_REG_MIPS_CP0_COUNT,
 528         KVM_REG_MIPS_CP0_ENTRYHI,
 529         KVM_REG_MIPS_CP0_COMPARE,
 530         KVM_REG_MIPS_CP0_STATUS,
 531         KVM_REG_MIPS_CP0_CAUSE,
 532         KVM_REG_MIPS_CP0_EPC,
 533         KVM_REG_MIPS_CP0_CONFIG,
 534         KVM_REG_MIPS_CP0_CONFIG1,
 535         KVM_REG_MIPS_CP0_CONFIG2,
 536         KVM_REG_MIPS_CP0_CONFIG3,
 537         KVM_REG_MIPS_CP0_CONFIG7,
 538         KVM_REG_MIPS_CP0_ERROREPC,
 539
 540         KVM_REG_MIPS_COUNT_CTL,
 541         KVM_REG_MIPS_COUNT_RESUME,
 542         KVM_REG_MIPS_COUNT_HZ,
 543 };
 544
 545 static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
 546                             const struct kvm_one_reg *reg)
 547 {
 548         struct mips_coproc *cop0 = vcpu->arch.cop0;
 549         int ret;
 550         s64 v;
 551
 552         switch (reg->id) {
 553         case KVM_REG_MIPS_R0 ... KVM_REG_MIPS_R31:
 554                 v = (long)vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0];
 555                 break;
 556         case KVM_REG_MIPS_HI:
 557                 v = (long)vcpu->arch.hi;
 558                 break;
 559         case KVM_REG_MIPS_LO:
 560                 v = (long)vcpu->arch.lo;
 561                 break;
 562         case KVM_REG_MIPS_PC:
 563                 v = (long)vcpu->arch.pc;
 564                 break;
 565
 566         case KVM_REG_MIPS_CP0_INDEX:
 567                 v = (long)kvm_read_c0_guest_index(cop0);
 568                 break;
 569         case KVM_REG_MIPS_CP0_CONTEXT:
 570                 v = (long)kvm_read_c0_guest_context(cop0);
 571                 break;
 572         case KVM_REG_MIPS_CP0_USERLOCAL:
 573                 v = (long)kvm_read_c0_guest_userlocal(cop0);
 574                 break;
 575         case KVM_REG_MIPS_CP0_PAGEMASK:
 576                 v = (long)kvm_read_c0_guest_pagemask(cop0);
 577                 break;
 578         case KVM_REG_MIPS_CP0_WIRED:
 579                 v = (long)kvm_read_c0_guest_wired(cop0);
 580                 break;
 581         case KVM_REG_MIPS_CP0_HWRENA:
 582                 v = (long)kvm_read_c0_guest_hwrena(cop0);
 583                 break;
 584         case KVM_REG_MIPS_CP0_BADVADDR:
 585                 v = (long)kvm_read_c0_guest_badvaddr(cop0);
 586                 break;
 587         case KVM_REG_MIPS_CP0_ENTRYHI:
 588                 v = (long)kvm_read_c0_guest_entryhi(cop0);
 589                 break;
 590         case KVM_REG_MIPS_CP0_COMPARE:
 591                 v = (long)kvm_read_c0_guest_compare(cop0);
 592                 break;
 593         case KVM_REG_MIPS_CP0_STATUS:
 594                 v = (long)kvm_read_c0_guest_status(cop0);
 595                 break;
 596         case KVM_REG_MIPS_CP0_CAUSE:
 597                 v = (long)kvm_read_c0_guest_cause(cop0);
 598                 break;
 599         case KVM_REG_MIPS_CP0_EPC:
 600                 v = (long)kvm_read_c0_guest_epc(cop0);
 601                 break;
 602         case KVM_REG_MIPS_CP0_ERROREPC:
 603                 v = (long)kvm_read_c0_guest_errorepc(cop0);
 604                 break;
 605         case KVM_REG_MIPS_CP0_CONFIG:
 606                 v = (long)kvm_read_c0_guest_config(cop0);
 607                 break;
 608         case KVM_REG_MIPS_CP0_CONFIG1:
 609                 v = (long)kvm_read_c0_guest_config1(cop0);
 610                 break;
 611         case KVM_REG_MIPS_CP0_CONFIG2:
 612                 v = (long)kvm_read_c0_guest_config2(cop0);
 613                 break;
 614         case KVM_REG_MIPS_CP0_CONFIG3:
 615                 v = (long)kvm_read_c0_guest_config3(cop0);
 616                 break;
 617         case KVM_REG_MIPS_CP0_CONFIG7:
 618                 v = (long)kvm_read_c0_guest_config7(cop0);
 619                 break;
 620         /* registers to be handled specially */
 621         case KVM_REG_MIPS_CP0_COUNT:
 622         case KVM_REG_MIPS_COUNT_CTL:
 623         case KVM_REG_MIPS_COUNT_RESUME:
 624         case KVM_REG_MIPS_COUNT_HZ:
 625                 ret = kvm_mips_callbacks->get_one_reg(vcpu, reg, &v);
 626                 if (ret)
 627                         return ret;
 628                 break;
 629         default:
 630                 return -EINVAL;
 631         }
 632         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 633                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 634                 return put_user(v, uaddr64);
 635         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 636                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 637                 u32 v32 = (u32)v;
 638                 return put_user(v32, uaddr32);
 639         } else {
 640                 return -EINVAL;
 641         }
 642 }
 643
 644 static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
 645                             const struct kvm_one_reg *reg)
 646 {
 647         struct mips_coproc *cop0 = vcpu->arch.cop0;
 648         u64 v;
 649
 650         if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U64) {
 651                 u64 __user *uaddr64 = (u64 __user *)(long)reg->addr;
 652
 653                 if (get_user(v, uaddr64) != 0)
 654                         return -EFAULT;
 655         } else if ((reg->id & KVM_REG_SIZE_MASK) == KVM_REG_SIZE_U32) {
 656                 u32 __user *uaddr32 = (u32 __user *)(long)reg->addr;
 657                 s32 v32;
 658
 659                 if (get_user(v32, uaddr32) != 0)
 660                         return -EFAULT;
 661                 v = (s64)v32;
 662         } else {
 663                 return -EINVAL;
 664         }
 665
 666         switch (reg->id) {
 667         case KVM_REG_MIPS_R0:
 668                 /* Silently ignore requests to set $0 */
 669                 break;
 670         case KVM_REG_MIPS_R1 ... KVM_REG_MIPS_R31:
 671                 vcpu->arch.gprs[reg->id - KVM_REG_MIPS_R0] = v;
 672                 break;
 673         case KVM_REG_MIPS_HI:
 674                 vcpu->arch.hi = v;
 675                 break;
 676         case KVM_REG_MIPS_LO:
 677                 vcpu->arch.lo = v;
 678                 break;
 679         case KVM_REG_MIPS_PC:
 680                 vcpu->arch.pc = v;
 681                 break;
 682
 683         case KVM_REG_MIPS_CP0_INDEX:
 684                 kvm_write_c0_guest_index(cop0, v);
 685                 break;
 686         case KVM_REG_MIPS_CP0_CONTEXT:
 687                 kvm_write_c0_guest_context(cop0, v);
 688                 break;
 689         case KVM_REG_MIPS_CP0_USERLOCAL:
 690                 kvm_write_c0_guest_userlocal(cop0, v);
 691                 break;
 692         case KVM_REG_MIPS_CP0_PAGEMASK:
 693                 kvm_write_c0_guest_pagemask(cop0, v);
 694                 break;
 695         case KVM_REG_MIPS_CP0_WIRED:
 696                 kvm_write_c0_guest_wired(cop0, v);
 697                 break;
 698         case KVM_REG_MIPS_CP0_HWRENA:
 699                 kvm_write_c0_guest_hwrena(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_EPC:
 711                 kvm_write_c0_guest_epc(cop0, v);
 712                 break;
 713         case KVM_REG_MIPS_CP0_ERROREPC:
 714                 kvm_write_c0_guest_errorepc(cop0, v);
 715                 break;
 716         /* registers to be handled specially */
 717         case KVM_REG_MIPS_CP0_COUNT:
 718         case KVM_REG_MIPS_CP0_COMPARE:
 719         case KVM_REG_MIPS_CP0_CAUSE:
 720         case KVM_REG_MIPS_COUNT_CTL:
 721         case KVM_REG_MIPS_COUNT_RESUME:
 722         case KVM_REG_MIPS_COUNT_HZ:
 723                 return kvm_mips_callbacks->set_one_reg(vcpu, reg, v);
 724         default:
 725                 return -EINVAL;
 726         }
 727         return 0;
 728 }
 729
 730 long
 731 kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 732 {
 733         struct kvm_vcpu *vcpu = filp->private_data;
 734         void __user *argp = (void __user *)arg;
 735         long r;
 736
 737         switch (ioctl) {
 738         case KVM_SET_ONE_REG:
 739         case KVM_GET_ONE_REG: {
 740                 struct kvm_one_reg reg;
 741                 if (copy_from_user(&reg, argp, sizeof(reg)))
 742                         return -EFAULT;
 743                 if (ioctl == KVM_SET_ONE_REG)
 744                         return kvm_mips_set_reg(vcpu, &reg);
 745                 else
 746                         return kvm_mips_get_reg(vcpu, &reg);
 747         }
 748         case KVM_GET_REG_LIST: {
 749                 struct kvm_reg_list __user *user_list = argp;
 750                 u64 __user *reg_dest;
 751                 struct kvm_reg_list reg_list;
 752                 unsigned n;
 753
 754                 if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
 755                         return -EFAULT;
 756                 n = reg_list.n;
 757                 reg_list.n = ARRAY_SIZE(kvm_mips_get_one_regs);
 758                 if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
 759                         return -EFAULT;
 760                 if (n < reg_list.n)
 761                         return -E2BIG;
 762                 reg_dest = user_list->reg;
 763                 if (copy_to_user(reg_dest, kvm_mips_get_one_regs,
 764                                  sizeof(kvm_mips_get_one_regs)))
 765                         return -EFAULT;
 766                 return 0;
 767         }
 768         case KVM_NMI:
 769                 /* Treat the NMI as a CPU reset */
 770                 r = kvm_mips_reset_vcpu(vcpu);
 771                 break;
 772         case KVM_INTERRUPT:
 773                 {
 774                         struct kvm_mips_interrupt irq;
 775                         r = -EFAULT;
 776                         if (copy_from_user(&irq, argp, sizeof(irq)))
 777                                 goto out;
 778
 779                         kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
 780                                   irq.irq);
 781
 782                         r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 783                         break;
 784                 }
 785         default:
 786                 r = -ENOIOCTLCMD;
 787         }
 788
 789 out:
 790         return r;
 791 }
 792
 793 /*
 794  * Get (and clear) the dirty memory log for a memory slot.
 795  */
 796 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 797 {
 798         struct kvm_memory_slot *memslot;
 799         unsigned long ga, ga_end;
 800         int is_dirty = 0;
 801         int r;
 802         unsigned long n;
 803
 804         mutex_lock(&kvm->slots_lock);
 805
 806         r = kvm_get_dirty_log(kvm, log, &is_dirty);
 807         if (r)
 808                 goto out;
 809
 810         /* If nothing is dirty, don't bother messing with page tables. */
 811         if (is_dirty) {
 812                 memslot = &kvm->memslots->memslots[log->slot];
 813
 814                 ga = memslot->base_gfn << PAGE_SHIFT;
 815                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
 816
 817                 printk("%s: dirty, ga: %#lx, ga_end %#lx\n", __func__, ga,
 818                        ga_end);
 819
 820                 n = kvm_dirty_bitmap_bytes(memslot);
 821                 memset(memslot->dirty_bitmap, 0, n);
 822         }
 823
 824         r = 0;
 825 out:
 826         mutex_unlock(&kvm->slots_lock);
 827         return r;
 828
 829 }
 830
 831 long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 832 {
 833         long r;
 834
 835         switch (ioctl) {
 836         default:
 837                 r = -ENOIOCTLCMD;
 838         }
 839
 840         return r;
 841 }
 842
 843 int kvm_arch_init(void *opaque)
 844 {
 845         int ret;
 846
 847         if (kvm_mips_callbacks) {
 848                 kvm_err("kvm: module already exists\n");
 849                 return -EEXIST;
 850         }
 851
 852         ret = kvm_mips_emulation_init(&kvm_mips_callbacks);
 853
 854         return ret;
 855 }
 856
 857 void kvm_arch_exit(void)
 858 {
 859         kvm_mips_callbacks = NULL;
 860 }
 861
 862 int
 863 kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 864 {
 865         return -ENOIOCTLCMD;
 866 }
 867
 868 int
 869 kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 870 {
 871         return -ENOIOCTLCMD;
 872 }
 873
 874 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 875 {
 876         return 0;
 877 }
 878
 879 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 880 {
 881         return -ENOIOCTLCMD;
 882 }
 883
 884 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 885 {
 886         return -ENOIOCTLCMD;
 887 }
 888
 889 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 890 {
 891         return VM_FAULT_SIGBUS;
 892 }
 893
 894 int kvm_dev_ioctl_check_extension(long ext)
 895 {
 896         int r;
 897
 898         switch (ext) {
 899         case KVM_CAP_ONE_REG:
 900                 r = 1;
 901                 break;
 902         case KVM_CAP_COALESCED_MMIO:
 903                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 904                 break;
 905         default:
 906                 r = 0;
 907                 break;
 908         }
 909         return r;
 910 }
 911
 912 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 913 {
 914         return kvm_mips_pending_timer(vcpu);
 915 }
 916
 917 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
 918 {
 919         int i;
 920         struct mips_coproc *cop0;
 921
 922         if (!vcpu)
 923                 return -1;
 924
 925         printk("VCPU Register Dump:\n");
 926         printk("\tpc = 0x%08lx\n", vcpu->arch.pc);
 927         printk("\texceptions: %08lx\n", vcpu->arch.pending_exceptions);
 928
 929         for (i = 0; i < 32; i += 4) {
 930                 printk("\tgpr%02d: %08lx %08lx %08lx %08lx\n", i,
 931                        vcpu->arch.gprs[i],
 932                        vcpu->arch.gprs[i + 1],
 933                        vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
 934         }
 935         printk("\thi: 0x%08lx\n", vcpu->arch.hi);
 936         printk("\tlo: 0x%08lx\n", vcpu->arch.lo);
 937
 938         cop0 = vcpu->arch.cop0;
 939         printk("\tStatus: 0x%08lx, Cause: 0x%08lx\n",
 940                kvm_read_c0_guest_status(cop0), kvm_read_c0_guest_cause(cop0));
 941
 942         printk("\tEPC: 0x%08lx\n", kvm_read_c0_guest_epc(cop0));
 943
 944         return 0;
 945 }
 946
 947 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 948 {
 949         int i;
 950
 951         for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 952                 vcpu->arch.gprs[i] = regs->gpr[i];
 953         vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
 954         vcpu->arch.hi = regs->hi;
 955         vcpu->arch.lo = regs->lo;
 956         vcpu->arch.pc = regs->pc;
 957
 958         return 0;
 959 }
 960
 961 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 962 {
 963         int i;
 964
 965         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
 966                 regs->gpr[i] = vcpu->arch.gprs[i];
 967
 968         regs->hi = vcpu->arch.hi;
 969         regs->lo = vcpu->arch.lo;
 970         regs->pc = vcpu->arch.pc;
 971
 972         return 0;
 973 }
 974
 975 static void kvm_mips_comparecount_func(unsigned long data)
 976 {
 977         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 978
 979         kvm_mips_callbacks->queue_timer_int(vcpu);
 980
 981         vcpu->arch.wait = 0;
 982         if (waitqueue_active(&vcpu->wq)) {
 983                 wake_up_interruptible(&vcpu->wq);
 984         }
 985 }
 986
 987 /*
 988  * low level hrtimer wake routine.
 989  */
 990 static enum hrtimer_restart kvm_mips_comparecount_wakeup(struct hrtimer *timer)
 991 {
 992         struct kvm_vcpu *vcpu;
 993
 994         vcpu = container_of(timer, struct kvm_vcpu, arch.comparecount_timer);
 995         kvm_mips_comparecount_func((unsigned long) vcpu);
 996         return kvm_mips_count_timeout(vcpu);
 997 }
 998
 999 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
1000 {
1001         kvm_mips_callbacks->vcpu_init(vcpu);
1002         hrtimer_init(&vcpu->arch.comparecount_timer, CLOCK_MONOTONIC,
1003                      HRTIMER_MODE_REL);
1004         vcpu->arch.comparecount_timer.function = kvm_mips_comparecount_wakeup;
1005         return 0;
1006 }
1007
1008 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
1009 {
1010         return;
1011 }
1012
1013 int
1014 kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, struct kvm_translation *tr)
1015 {
1016         return 0;
1017 }
1018
1019 /* Initial guest state */
1020 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1021 {
1022         return kvm_mips_callbacks->vcpu_setup(vcpu);
1023 }
1024
1025 static
1026 void kvm_mips_set_c0_status(void)
1027 {
1028         uint32_t status = read_c0_status();
1029
1030         if (cpu_has_fpu)
1031                 status |= (ST0_CU1);
1032
1033         if (cpu_has_dsp)
1034                 status |= (ST0_MX);
1035
1036         write_c0_status(status);
1037         ehb();
1038 }
1039
1040 /*
1041  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
1042  */
1043 int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
1044 {
1045         uint32_t cause = vcpu->arch.host_cp0_cause;
1046         uint32_t exccode = (cause >> CAUSEB_EXCCODE) & 0x1f;
1047         uint32_t __user *opc = (uint32_t __user *) vcpu->arch.pc;
1048         unsigned long badvaddr = vcpu->arch.host_cp0_badvaddr;
1049         enum emulation_result er = EMULATE_DONE;
1050         int ret = RESUME_GUEST;
1051
1052         /* Set a default exit reason */
1053         run->exit_reason = KVM_EXIT_UNKNOWN;
1054         run->ready_for_interrupt_injection = 1;
1055
1056         /* Set the appropriate status bits based on host CPU features, before we hit the scheduler */
1057         kvm_mips_set_c0_status();
1058
1059         local_irq_enable();
1060
1061         kvm_debug("kvm_mips_handle_exit: cause: %#x, PC: %p, kvm_run: %p, kvm_vcpu: %p\n",
1062                         cause, opc, run, vcpu);
1063
1064         /* Do a privilege check, if in UM most of these exit conditions end up
1065          * causing an exception to be delivered to the Guest Kernel
1066          */
1067         er = kvm_mips_check_privilege(cause, opc, run, vcpu);
1068         if (er == EMULATE_PRIV_FAIL) {
1069                 goto skip_emul;
1070         } else if (er == EMULATE_FAIL) {
1071                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1072                 ret = RESUME_HOST;
1073                 goto skip_emul;
1074         }
1075
1076         switch (exccode) {
1077         case T_INT:
1078                 kvm_debug("[%d]T_INT @ %p\n", vcpu->vcpu_id, opc);
1079
1080                 ++vcpu->stat.int_exits;
1081                 trace_kvm_exit(vcpu, INT_EXITS);
1082
1083                 if (need_resched()) {
1084                         cond_resched();
1085                 }
1086
1087                 ret = RESUME_GUEST;
1088                 break;
1089
1090         case T_COP_UNUSABLE:
1091                 kvm_debug("T_COP_UNUSABLE: @ PC: %p\n", opc);
1092
1093                 ++vcpu->stat.cop_unusable_exits;
1094                 trace_kvm_exit(vcpu, COP_UNUSABLE_EXITS);
1095                 ret = kvm_mips_callbacks->handle_cop_unusable(vcpu);
1096                 /* XXXKYMA: Might need to return to user space */
1097                 if (run->exit_reason == KVM_EXIT_IRQ_WINDOW_OPEN) {
1098                         ret = RESUME_HOST;
1099                 }
1100                 break;
1101
1102         case T_TLB_MOD:
1103                 ++vcpu->stat.tlbmod_exits;
1104                 trace_kvm_exit(vcpu, TLBMOD_EXITS);
1105                 ret = kvm_mips_callbacks->handle_tlb_mod(vcpu);
1106                 break;
1107
1108         case T_TLB_ST_MISS:
1109                 kvm_debug
1110                     ("TLB ST fault:  cause %#x, status %#lx, PC: %p, BadVaddr: %#lx\n",
1111                      cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
1112                      badvaddr);
1113
1114                 ++vcpu->stat.tlbmiss_st_exits;
1115                 trace_kvm_exit(vcpu, TLBMISS_ST_EXITS);
1116                 ret = kvm_mips_callbacks->handle_tlb_st_miss(vcpu);
1117                 break;
1118
1119         case T_TLB_LD_MISS:
1120                 kvm_debug("TLB LD fault: cause %#x, PC: %p, BadVaddr: %#lx\n",
1121                           cause, opc, badvaddr);
1122
1123                 ++vcpu->stat.tlbmiss_ld_exits;
1124                 trace_kvm_exit(vcpu, TLBMISS_LD_EXITS);
1125                 ret = kvm_mips_callbacks->handle_tlb_ld_miss(vcpu);
1126                 break;
1127
1128         case T_ADDR_ERR_ST:
1129                 ++vcpu->stat.addrerr_st_exits;
1130                 trace_kvm_exit(vcpu, ADDRERR_ST_EXITS);
1131                 ret = kvm_mips_callbacks->handle_addr_err_st(vcpu);
1132                 break;
1133
1134         case T_ADDR_ERR_LD:
1135                 ++vcpu->stat.addrerr_ld_exits;
1136                 trace_kvm_exit(vcpu, ADDRERR_LD_EXITS);
1137                 ret = kvm_mips_callbacks->handle_addr_err_ld(vcpu);
1138                 break;
1139
1140         case T_SYSCALL:
1141                 ++vcpu->stat.syscall_exits;
1142                 trace_kvm_exit(vcpu, SYSCALL_EXITS);
1143                 ret = kvm_mips_callbacks->handle_syscall(vcpu);
1144                 break;
1145
1146         case T_RES_INST:
1147                 ++vcpu->stat.resvd_inst_exits;
1148                 trace_kvm_exit(vcpu, RESVD_INST_EXITS);
1149                 ret = kvm_mips_callbacks->handle_res_inst(vcpu);
1150                 break;
1151
1152         case T_BREAK:
1153                 ++vcpu->stat.break_inst_exits;
1154                 trace_kvm_exit(vcpu, BREAK_INST_EXITS);
1155                 ret = kvm_mips_callbacks->handle_break(vcpu);
1156                 break;
1157
1158         default:
1159                 kvm_err
1160                     ("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x  BadVaddr: %#lx Status: %#lx\n",
1161                      exccode, opc, kvm_get_inst(opc, vcpu), badvaddr,
1162                      kvm_read_c0_guest_status(vcpu->arch.cop0));
1163                 kvm_arch_vcpu_dump_regs(vcpu);
1164                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1165                 ret = RESUME_HOST;
1166                 break;
1167
1168         }
1169
1170 skip_emul:
1171         local_irq_disable();
1172
1173         if (er == EMULATE_DONE && !(ret & RESUME_HOST))
1174                 kvm_mips_deliver_interrupts(vcpu, cause);
1175
1176         if (!(ret & RESUME_HOST)) {
1177                 /* Only check for signals if not already exiting to userspace  */
1178                 if (signal_pending(current)) {
1179                         run->exit_reason = KVM_EXIT_INTR;
1180                         ret = (-EINTR << 2) | RESUME_HOST;
1181                         ++vcpu->stat.signal_exits;
1182                         trace_kvm_exit(vcpu, SIGNAL_EXITS);
1183                 }
1184         }
1185
1186         return ret;
1187 }
1188
1189 int __init kvm_mips_init(void)
1190 {
1191         int ret;
1192
1193         ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1194
1195         if (ret)
1196                 return ret;
1197
1198         /* On MIPS, kernel modules are executed from "mapped space", which requires TLBs.
1199          * The TLB handling code is statically linked with the rest of the kernel (kvm_tlb.c)
1200          * to avoid the possibility of double faulting. The issue is that the TLB code
1201          * references routines that are part of the the KVM module,
1202          * which are only available once the module is loaded.
1203          */
1204         kvm_mips_gfn_to_pfn = gfn_to_pfn;
1205         kvm_mips_release_pfn_clean = kvm_release_pfn_clean;
1206         kvm_mips_is_error_pfn = is_error_pfn;
1207
1208         pr_info("KVM/MIPS Initialized\n");
1209         return 0;
1210 }
1211
1212 void __exit kvm_mips_exit(void)
1213 {
1214         kvm_exit();
1215
1216         kvm_mips_gfn_to_pfn = NULL;
1217         kvm_mips_release_pfn_clean = NULL;
1218         kvm_mips_is_error_pfn = NULL;
1219
1220         pr_info("KVM/MIPS unloaded\n");
1221 }
1222
1223 module_init(kvm_mips_init);
1224 module_exit(kvm_mips_exit);
1225
1226 EXPORT_TRACEPOINT_SYMBOL(kvm_exit);