Pileus Git - ~andy/linux/blob - arch/powerpc/kvm/powerpc.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2007
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  19  */
  20
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/hrtimer.h>
  26 #include <linux/fs.h>
  27 #include <linux/slab.h>
  28 #include <asm/cputable.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/kvm_ppc.h>
  31 #include <asm/tlbflush.h>
  32 #include <asm/cputhreads.h>
  33 #include <asm/irqflags.h>
  34 #include "timing.h"
  35 #include "../mm/mmu_decl.h"
  36
  37 #define CREATE_TRACE_POINTS
  38 #include "trace.h"
  39
  40 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  41 {
  42         return !!(v->arch.pending_exceptions) ||
  43                v->requests;
  44 }
  45
  46 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  47 {
  48         return 1;
  49 }
  50
  51 #ifndef CONFIG_KVM_BOOK3S_64_HV
  52 /*
  53  * Common checks before entering the guest world.  Call with interrupts
  54  * disabled.
  55  *
  56  * returns:
  57  *
  58  * == 1 if we're ready to go into guest state
  59  * <= 0 if we need to go back to the host with return value
  60  */
  61 int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
  62 {
  63         int r = 1;
  64
  65         WARN_ON_ONCE(!irqs_disabled());
  66         while (true) {
  67                 if (need_resched()) {
  68                         local_irq_enable();
  69                         cond_resched();
  70                         local_irq_disable();
  71                         continue;
  72                 }
  73
  74                 if (signal_pending(current)) {
  75                         kvmppc_account_exit(vcpu, SIGNAL_EXITS);
  76                         vcpu->run->exit_reason = KVM_EXIT_INTR;
  77                         r = -EINTR;
  78                         break;
  79                 }
  80
  81                 vcpu->mode = IN_GUEST_MODE;
  82
  83                 /*
  84                  * Reading vcpu->requests must happen after setting vcpu->mode,
  85                  * so we don't miss a request because the requester sees
  86                  * OUTSIDE_GUEST_MODE and assumes we'll be checking requests
  87                  * before next entering the guest (and thus doesn't IPI).
  88                  */
  89                 smp_mb();
  90
  91                 if (vcpu->requests) {
  92                         /* Make sure we process requests preemptable */
  93                         local_irq_enable();
  94                         trace_kvm_check_requests(vcpu);
  95                         r = kvmppc_core_check_requests(vcpu);
  96                         local_irq_disable();
  97                         if (r > 0)
  98                                 continue;
  99                         break;
 100                 }
 101
 102                 if (kvmppc_core_prepare_to_enter(vcpu)) {
 103                         /* interrupts got enabled in between, so we
 104                            are back at square 1 */
 105                         continue;
 106                 }
 107
 108 #ifdef CONFIG_PPC64
 109                 /* lazy EE magic */
 110                 hard_irq_disable();
 111                 if (lazy_irq_pending()) {
 112                         /* Got an interrupt in between, try again */
 113                         local_irq_enable();
 114                         local_irq_disable();
 115                         kvm_guest_exit();
 116                         continue;
 117                 }
 118
 119                 trace_hardirqs_on();
 120 #endif
 121
 122                 kvm_guest_enter();
 123                 break;
 124         }
 125
 126         return r;
 127 }
 128 #endif /* CONFIG_KVM_BOOK3S_64_HV */
 129
 130 int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
 131 {
 132         int nr = kvmppc_get_gpr(vcpu, 11);
 133         int r;
 134         unsigned long __maybe_unused param1 = kvmppc_get_gpr(vcpu, 3);
 135         unsigned long __maybe_unused param2 = kvmppc_get_gpr(vcpu, 4);
 136         unsigned long __maybe_unused param3 = kvmppc_get_gpr(vcpu, 5);
 137         unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
 138         unsigned long r2 = 0;
 139
 140         if (!(vcpu->arch.shared->msr & MSR_SF)) {
 141                 /* 32 bit mode */
 142                 param1 &= 0xffffffff;
 143                 param2 &= 0xffffffff;
 144                 param3 &= 0xffffffff;
 145                 param4 &= 0xffffffff;
 146         }
 147
 148         switch (nr) {
 149         case KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE):
 150         {
 151                 vcpu->arch.magic_page_pa = param1;
 152                 vcpu->arch.magic_page_ea = param2;
 153
 154                 r2 = KVM_MAGIC_FEAT_SR | KVM_MAGIC_FEAT_MAS0_TO_SPRG7;
 155
 156                 r = EV_SUCCESS;
 157                 break;
 158         }
 159         case KVM_HCALL_TOKEN(KVM_HC_FEATURES):
 160                 r = EV_SUCCESS;
 161 #if defined(CONFIG_PPC_BOOK3S) || defined(CONFIG_KVM_E500V2)
 162                 /* XXX Missing magic page on 44x */
 163                 r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
 164 #endif
 165
 166                 /* Second return value is in r4 */
 167                 break;
 168         case EV_HCALL_TOKEN(EV_IDLE):
 169                 r = EV_SUCCESS;
 170                 kvm_vcpu_block(vcpu);
 171                 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
 172                 break;
 173         default:
 174                 r = EV_UNIMPLEMENTED;
 175                 break;
 176         }
 177
 178         kvmppc_set_gpr(vcpu, 4, r2);
 179
 180         return r;
 181 }
 182
 183 int kvmppc_sanity_check(struct kvm_vcpu *vcpu)
 184 {
 185         int r = false;
 186
 187         /* We have to know what CPU to virtualize */
 188         if (!vcpu->arch.pvr)
 189                 goto out;
 190
 191         /* PAPR only works with book3s_64 */
 192         if ((vcpu->arch.cpu_type != KVM_CPU_3S_64) && vcpu->arch.papr_enabled)
 193                 goto out;
 194
 195 #ifdef CONFIG_KVM_BOOK3S_64_HV
 196         /* HV KVM can only do PAPR mode for now */
 197         if (!vcpu->arch.papr_enabled)
 198                 goto out;
 199 #endif
 200
 201 #ifdef CONFIG_KVM_BOOKE_HV
 202         if (!cpu_has_feature(CPU_FTR_EMB_HV))
 203                 goto out;
 204 #endif
 205
 206         r = true;
 207
 208 out:
 209         vcpu->arch.sane = r;
 210         return r ? 0 : -EINVAL;
 211 }
 212
 213 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
 214 {
 215         enum emulation_result er;
 216         int r;
 217
 218         er = kvmppc_emulate_instruction(run, vcpu);
 219         switch (er) {
 220         case EMULATE_DONE:
 221                 /* Future optimization: only reload non-volatiles if they were
 222                  * actually modified. */
 223                 r = RESUME_GUEST_NV;
 224                 break;
 225         case EMULATE_DO_MMIO:
 226                 run->exit_reason = KVM_EXIT_MMIO;
 227                 /* We must reload nonvolatiles because "update" load/store
 228                  * instructions modify register state. */
 229                 /* Future optimization: only reload non-volatiles if they were
 230                  * actually modified. */
 231                 r = RESUME_HOST_NV;
 232                 break;
 233         case EMULATE_FAIL:
 234                 /* XXX Deliver Program interrupt to guest. */
 235                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
 236                        kvmppc_get_last_inst(vcpu));
 237                 r = RESUME_HOST;
 238                 break;
 239         default:
 240                 WARN_ON(1);
 241                 r = RESUME_GUEST;
 242         }
 243
 244         return r;
 245 }
 246
 247 int kvm_arch_hardware_enable(void *garbage)
 248 {
 249         return 0;
 250 }
 251
 252 void kvm_arch_hardware_disable(void *garbage)
 253 {
 254 }
 255
 256 int kvm_arch_hardware_setup(void)
 257 {
 258         return 0;
 259 }
 260
 261 void kvm_arch_hardware_unsetup(void)
 262 {
 263 }
 264
 265 void kvm_arch_check_processor_compat(void *rtn)
 266 {
 267         *(int *)rtn = kvmppc_core_check_processor_compat();
 268 }
 269
 270 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 271 {
 272         if (type)
 273                 return -EINVAL;
 274
 275         return kvmppc_core_init_vm(kvm);
 276 }
 277
 278 void kvm_arch_destroy_vm(struct kvm *kvm)
 279 {
 280         unsigned int i;
 281         struct kvm_vcpu *vcpu;
 282
 283         kvm_for_each_vcpu(i, vcpu, kvm)
 284                 kvm_arch_vcpu_free(vcpu);
 285
 286         mutex_lock(&kvm->lock);
 287         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 288                 kvm->vcpus[i] = NULL;
 289
 290         atomic_set(&kvm->online_vcpus, 0);
 291
 292         kvmppc_core_destroy_vm(kvm);
 293
 294         mutex_unlock(&kvm->lock);
 295 }
 296
 297 void kvm_arch_sync_events(struct kvm *kvm)
 298 {
 299 }
 300
 301 int kvm_dev_ioctl_check_extension(long ext)
 302 {
 303         int r;
 304
 305         switch (ext) {
 306 #ifdef CONFIG_BOOKE
 307         case KVM_CAP_PPC_BOOKE_SREGS:
 308         case KVM_CAP_PPC_BOOKE_WATCHDOG:
 309         case KVM_CAP_PPC_EPR:
 310 #else
 311         case KVM_CAP_PPC_SEGSTATE:
 312         case KVM_CAP_PPC_HIOR:
 313         case KVM_CAP_PPC_PAPR:
 314 #endif
 315         case KVM_CAP_PPC_UNSET_IRQ:
 316         case KVM_CAP_PPC_IRQ_LEVEL:
 317         case KVM_CAP_ENABLE_CAP:
 318         case KVM_CAP_ONE_REG:
 319         case KVM_CAP_IOEVENTFD:
 320                 r = 1;
 321                 break;
 322 #ifndef CONFIG_KVM_BOOK3S_64_HV
 323         case KVM_CAP_PPC_PAIRED_SINGLES:
 324         case KVM_CAP_PPC_OSI:
 325         case KVM_CAP_PPC_GET_PVINFO:
 326 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 327         case KVM_CAP_SW_TLB:
 328 #endif
 329                 r = 1;
 330                 break;
 331         case KVM_CAP_COALESCED_MMIO:
 332                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 333                 break;
 334 #endif
 335 #ifdef CONFIG_PPC_BOOK3S_64
 336         case KVM_CAP_SPAPR_TCE:
 337         case KVM_CAP_PPC_ALLOC_HTAB:
 338                 r = 1;
 339                 break;
 340 #endif /* CONFIG_PPC_BOOK3S_64 */
 341 #ifdef CONFIG_KVM_BOOK3S_64_HV
 342         case KVM_CAP_PPC_SMT:
 343                 r = threads_per_core;
 344                 break;
 345         case KVM_CAP_PPC_RMA:
 346                 r = 1;
 347                 /* PPC970 requires an RMA */
 348                 if (cpu_has_feature(CPU_FTR_ARCH_201))
 349                         r = 2;
 350                 break;
 351 #endif
 352         case KVM_CAP_SYNC_MMU:
 353 #ifdef CONFIG_KVM_BOOK3S_64_HV
 354                 r = cpu_has_feature(CPU_FTR_ARCH_206) ? 1 : 0;
 355 #elif defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 356                 r = 1;
 357 #else
 358                 r = 0;
 359                 break;
 360 #endif
 361 #ifdef CONFIG_KVM_BOOK3S_64_HV
 362         case KVM_CAP_PPC_HTAB_FD:
 363                 r = 1;
 364                 break;
 365 #endif
 366                 break;
 367         case KVM_CAP_NR_VCPUS:
 368                 /*
 369                  * Recommending a number of CPUs is somewhat arbitrary; we
 370                  * return the number of present CPUs for -HV (since a host
 371                  * will have secondary threads "offline"), and for other KVM
 372                  * implementations just count online CPUs.
 373                  */
 374 #ifdef CONFIG_KVM_BOOK3S_64_HV
 375                 r = num_present_cpus();
 376 #else
 377                 r = num_online_cpus();
 378 #endif
 379                 break;
 380         case KVM_CAP_MAX_VCPUS:
 381                 r = KVM_MAX_VCPUS;
 382                 break;
 383 #ifdef CONFIG_PPC_BOOK3S_64
 384         case KVM_CAP_PPC_GET_SMMU_INFO:
 385                 r = 1;
 386                 break;
 387 #endif
 388         default:
 389                 r = 0;
 390                 break;
 391         }
 392         return r;
 393
 394 }
 395
 396 long kvm_arch_dev_ioctl(struct file *filp,
 397                         unsigned int ioctl, unsigned long arg)
 398 {
 399         return -EINVAL;
 400 }
 401
 402 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 403                            struct kvm_memory_slot *dont)
 404 {
 405         kvmppc_core_free_memslot(free, dont);
 406 }
 407
 408 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
 409 {
 410         return kvmppc_core_create_memslot(slot, npages);
 411 }
 412
 413 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 414                                    struct kvm_memory_slot *memslot,
 415                                    struct kvm_userspace_memory_region *mem,
 416                                    enum kvm_mr_change change)
 417 {
 418         return kvmppc_core_prepare_memory_region(kvm, memslot, mem);
 419 }
 420
 421 void kvm_arch_commit_memory_region(struct kvm *kvm,
 422                                    struct kvm_userspace_memory_region *mem,
 423                                    const struct kvm_memory_slot *old,
 424                                    enum kvm_mr_change change)
 425 {
 426         kvmppc_core_commit_memory_region(kvm, mem, old);
 427 }
 428
 429 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 430 {
 431 }
 432
 433 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 434                                    struct kvm_memory_slot *slot)
 435 {
 436         kvmppc_core_flush_memslot(kvm, slot);
 437 }
 438
 439 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 440 {
 441         struct kvm_vcpu *vcpu;
 442         vcpu = kvmppc_core_vcpu_create(kvm, id);
 443         if (!IS_ERR(vcpu)) {
 444                 vcpu->arch.wqp = &vcpu->wq;
 445                 kvmppc_create_vcpu_debugfs(vcpu, id);
 446         }
 447         return vcpu;
 448 }
 449
 450 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 451 {
 452         return 0;
 453 }
 454
 455 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 456 {
 457         /* Make sure we're not using the vcpu anymore */
 458         hrtimer_cancel(&vcpu->arch.dec_timer);
 459         tasklet_kill(&vcpu->arch.tasklet);
 460
 461         kvmppc_remove_vcpu_debugfs(vcpu);
 462         kvmppc_core_vcpu_free(vcpu);
 463 }
 464
 465 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 466 {
 467         kvm_arch_vcpu_free(vcpu);
 468 }
 469
 470 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 471 {
 472         return kvmppc_core_pending_dec(vcpu);
 473 }
 474
 475 /*
 476  * low level hrtimer wake routine. Because this runs in hardirq context
 477  * we schedule a tasklet to do the real work.
 478  */
 479 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 480 {
 481         struct kvm_vcpu *vcpu;
 482
 483         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 484         tasklet_schedule(&vcpu->arch.tasklet);
 485
 486         return HRTIMER_NORESTART;
 487 }
 488
 489 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 490 {
 491         int ret;
 492
 493         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 494         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 495         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 496         vcpu->arch.dec_expires = ~(u64)0;
 497
 498 #ifdef CONFIG_KVM_EXIT_TIMING
 499         mutex_init(&vcpu->arch.exit_timing_lock);
 500 #endif
 501         ret = kvmppc_subarch_vcpu_init(vcpu);
 502         return ret;
 503 }
 504
 505 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 506 {
 507         kvmppc_mmu_destroy(vcpu);
 508         kvmppc_subarch_vcpu_uninit(vcpu);
 509 }
 510
 511 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 512 {
 513 #ifdef CONFIG_BOOKE
 514         /*
 515          * vrsave (formerly usprg0) isn't used by Linux, but may
 516          * be used by the guest.
 517          *
 518          * On non-booke this is associated with Altivec and
 519          * is handled by code in book3s.c.
 520          */
 521         mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
 522 #endif
 523         kvmppc_core_vcpu_load(vcpu, cpu);
 524 }
 525
 526 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 527 {
 528         kvmppc_core_vcpu_put(vcpu);
 529 #ifdef CONFIG_BOOKE
 530         vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
 531 #endif
 532 }
 533
 534 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 535                                         struct kvm_guest_debug *dbg)
 536 {
 537         return -EINVAL;
 538 }
 539
 540 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 541                                      struct kvm_run *run)
 542 {
 543         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 544 }
 545
 546 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 547                                       struct kvm_run *run)
 548 {
 549         u64 uninitialized_var(gpr);
 550
 551         if (run->mmio.len > sizeof(gpr)) {
 552                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 553                 return;
 554         }
 555
 556         if (vcpu->arch.mmio_is_bigendian) {
 557                 switch (run->mmio.len) {
 558                 case 8: gpr = *(u64 *)run->mmio.data; break;
 559                 case 4: gpr = *(u32 *)run->mmio.data; break;
 560                 case 2: gpr = *(u16 *)run->mmio.data; break;
 561                 case 1: gpr = *(u8 *)run->mmio.data; break;
 562                 }
 563         } else {
 564                 /* Convert BE data from userland back to LE. */
 565                 switch (run->mmio.len) {
 566                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 567                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 568                 case 1: gpr = *(u8 *)run->mmio.data; break;
 569                 }
 570         }
 571
 572         if (vcpu->arch.mmio_sign_extend) {
 573                 switch (run->mmio.len) {
 574 #ifdef CONFIG_PPC64
 575                 case 4:
 576                         gpr = (s64)(s32)gpr;
 577                         break;
 578 #endif
 579                 case 2:
 580                         gpr = (s64)(s16)gpr;
 581                         break;
 582                 case 1:
 583                         gpr = (s64)(s8)gpr;
 584                         break;
 585                 }
 586         }
 587
 588         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 589
 590         switch (vcpu->arch.io_gpr & KVM_MMIO_REG_EXT_MASK) {
 591         case KVM_MMIO_REG_GPR:
 592                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 593                 break;
 594         case KVM_MMIO_REG_FPR:
 595                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 596                 break;
 597 #ifdef CONFIG_PPC_BOOK3S
 598         case KVM_MMIO_REG_QPR:
 599                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 600                 break;
 601         case KVM_MMIO_REG_FQPR:
 602                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 603                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 604                 break;
 605 #endif
 606         default:
 607                 BUG();
 608         }
 609 }
 610
 611 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 612                        unsigned int rt, unsigned int bytes, int is_bigendian)
 613 {
 614         if (bytes > sizeof(run->mmio.data)) {
 615                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 616                        run->mmio.len);
 617         }
 618
 619         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 620         run->mmio.len = bytes;
 621         run->mmio.is_write = 0;
 622
 623         vcpu->arch.io_gpr = rt;
 624         vcpu->arch.mmio_is_bigendian = is_bigendian;
 625         vcpu->mmio_needed = 1;
 626         vcpu->mmio_is_write = 0;
 627         vcpu->arch.mmio_sign_extend = 0;
 628
 629         if (!kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
 630                              bytes, &run->mmio.data)) {
 631                 kvmppc_complete_mmio_load(vcpu, run);
 632                 vcpu->mmio_needed = 0;
 633                 return EMULATE_DONE;
 634         }
 635
 636         return EMULATE_DO_MMIO;
 637 }
 638
 639 /* Same as above, but sign extends */
 640 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 641                         unsigned int rt, unsigned int bytes, int is_bigendian)
 642 {
 643         int r;
 644
 645         vcpu->arch.mmio_sign_extend = 1;
 646         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 647
 648         return r;
 649 }
 650
 651 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 652                         u64 val, unsigned int bytes, int is_bigendian)
 653 {
 654         void *data = run->mmio.data;
 655
 656         if (bytes > sizeof(run->mmio.data)) {
 657                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 658                        run->mmio.len);
 659         }
 660
 661         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 662         run->mmio.len = bytes;
 663         run->mmio.is_write = 1;
 664         vcpu->mmio_needed = 1;
 665         vcpu->mmio_is_write = 1;
 666
 667         /* Store the value at the lowest bytes in 'data'. */
 668         if (is_bigendian) {
 669                 switch (bytes) {
 670                 case 8: *(u64 *)data = val; break;
 671                 case 4: *(u32 *)data = val; break;
 672                 case 2: *(u16 *)data = val; break;
 673                 case 1: *(u8  *)data = val; break;
 674                 }
 675         } else {
 676                 /* Store LE value into 'data'. */
 677                 switch (bytes) {
 678                 case 4: st_le32(data, val); break;
 679                 case 2: st_le16(data, val); break;
 680                 case 1: *(u8 *)data = val; break;
 681                 }
 682         }
 683
 684         if (!kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
 685                               bytes, &run->mmio.data)) {
 686                 vcpu->mmio_needed = 0;
 687                 return EMULATE_DONE;
 688         }
 689
 690         return EMULATE_DO_MMIO;
 691 }
 692
 693 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 694 {
 695         int r;
 696         sigset_t sigsaved;
 697
 698         if (vcpu->sigset_active)
 699                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 700
 701         if (vcpu->mmio_needed) {
 702                 if (!vcpu->mmio_is_write)
 703                         kvmppc_complete_mmio_load(vcpu, run);
 704                 vcpu->mmio_needed = 0;
 705         } else if (vcpu->arch.dcr_needed) {
 706                 if (!vcpu->arch.dcr_is_write)
 707                         kvmppc_complete_dcr_load(vcpu, run);
 708                 vcpu->arch.dcr_needed = 0;
 709         } else if (vcpu->arch.osi_needed) {
 710                 u64 *gprs = run->osi.gprs;
 711                 int i;
 712
 713                 for (i = 0; i < 32; i++)
 714                         kvmppc_set_gpr(vcpu, i, gprs[i]);
 715                 vcpu->arch.osi_needed = 0;
 716         } else if (vcpu->arch.hcall_needed) {
 717                 int i;
 718
 719                 kvmppc_set_gpr(vcpu, 3, run->papr_hcall.ret);
 720                 for (i = 0; i < 9; ++i)
 721                         kvmppc_set_gpr(vcpu, 4 + i, run->papr_hcall.args[i]);
 722                 vcpu->arch.hcall_needed = 0;
 723 #ifdef CONFIG_BOOKE
 724         } else if (vcpu->arch.epr_needed) {
 725                 kvmppc_set_epr(vcpu, run->epr.epr);
 726                 vcpu->arch.epr_needed = 0;
 727 #endif
 728         }
 729
 730         r = kvmppc_vcpu_run(run, vcpu);
 731
 732         if (vcpu->sigset_active)
 733                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 734
 735         return r;
 736 }
 737
 738 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 739 {
 740         if (irq->irq == KVM_INTERRUPT_UNSET) {
 741                 kvmppc_core_dequeue_external(vcpu);
 742                 return 0;
 743         }
 744
 745         kvmppc_core_queue_external(vcpu, irq);
 746
 747         kvm_vcpu_kick(vcpu);
 748
 749         return 0;
 750 }
 751
 752 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 753                                      struct kvm_enable_cap *cap)
 754 {
 755         int r;
 756
 757         if (cap->flags)
 758                 return -EINVAL;
 759
 760         switch (cap->cap) {
 761         case KVM_CAP_PPC_OSI:
 762                 r = 0;
 763                 vcpu->arch.osi_enabled = true;
 764                 break;
 765         case KVM_CAP_PPC_PAPR:
 766                 r = 0;
 767                 vcpu->arch.papr_enabled = true;
 768                 break;
 769         case KVM_CAP_PPC_EPR:
 770                 r = 0;
 771                 vcpu->arch.epr_enabled = cap->args[0];
 772                 break;
 773 #ifdef CONFIG_BOOKE
 774         case KVM_CAP_PPC_BOOKE_WATCHDOG:
 775                 r = 0;
 776                 vcpu->arch.watchdog_enabled = true;
 777                 break;
 778 #endif
 779 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 780         case KVM_CAP_SW_TLB: {
 781                 struct kvm_config_tlb cfg;
 782                 void __user *user_ptr = (void __user *)(uintptr_t)cap->args[0];
 783
 784                 r = -EFAULT;
 785                 if (copy_from_user(&cfg, user_ptr, sizeof(cfg)))
 786                         break;
 787
 788                 r = kvm_vcpu_ioctl_config_tlb(vcpu, &cfg);
 789                 break;
 790         }
 791 #endif
 792         default:
 793                 r = -EINVAL;
 794                 break;
 795         }
 796
 797         if (!r)
 798                 r = kvmppc_sanity_check(vcpu);
 799
 800         return r;
 801 }
 802
 803 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 804                                     struct kvm_mp_state *mp_state)
 805 {
 806         return -EINVAL;
 807 }
 808
 809 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 810                                     struct kvm_mp_state *mp_state)
 811 {
 812         return -EINVAL;
 813 }
 814
 815 long kvm_arch_vcpu_ioctl(struct file *filp,
 816                          unsigned int ioctl, unsigned long arg)
 817 {
 818         struct kvm_vcpu *vcpu = filp->private_data;
 819         void __user *argp = (void __user *)arg;
 820         long r;
 821
 822         switch (ioctl) {
 823         case KVM_INTERRUPT: {
 824                 struct kvm_interrupt irq;
 825                 r = -EFAULT;
 826                 if (copy_from_user(&irq, argp, sizeof(irq)))
 827                         goto out;
 828                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 829                 goto out;
 830         }
 831
 832         case KVM_ENABLE_CAP:
 833         {
 834                 struct kvm_enable_cap cap;
 835                 r = -EFAULT;
 836                 if (copy_from_user(&cap, argp, sizeof(cap)))
 837                         goto out;
 838                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 839                 break;
 840         }
 841
 842         case KVM_SET_ONE_REG:
 843         case KVM_GET_ONE_REG:
 844         {
 845                 struct kvm_one_reg reg;
 846                 r = -EFAULT;
 847                 if (copy_from_user(&reg, argp, sizeof(reg)))
 848                         goto out;
 849                 if (ioctl == KVM_SET_ONE_REG)
 850                         r = kvm_vcpu_ioctl_set_one_reg(vcpu, &reg);
 851                 else
 852                         r = kvm_vcpu_ioctl_get_one_reg(vcpu, &reg);
 853                 break;
 854         }
 855
 856 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 857         case KVM_DIRTY_TLB: {
 858                 struct kvm_dirty_tlb dirty;
 859                 r = -EFAULT;
 860                 if (copy_from_user(&dirty, argp, sizeof(dirty)))
 861                         goto out;
 862                 r = kvm_vcpu_ioctl_dirty_tlb(vcpu, &dirty);
 863                 break;
 864         }
 865 #endif
 866         default:
 867                 r = -EINVAL;
 868         }
 869
 870 out:
 871         return r;
 872 }
 873
 874 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 875 {
 876         return VM_FAULT_SIGBUS;
 877 }
 878
 879 static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
 880 {
 881         u32 inst_nop = 0x60000000;
 882 #ifdef CONFIG_KVM_BOOKE_HV
 883         u32 inst_sc1 = 0x44000022;
 884         pvinfo->hcall[0] = inst_sc1;
 885         pvinfo->hcall[1] = inst_nop;
 886         pvinfo->hcall[2] = inst_nop;
 887         pvinfo->hcall[3] = inst_nop;
 888 #else
 889         u32 inst_lis = 0x3c000000;
 890         u32 inst_ori = 0x60000000;
 891         u32 inst_sc = 0x44000002;
 892         u32 inst_imm_mask = 0xffff;
 893
 894         /*
 895          * The hypercall to get into KVM from within guest context is as
 896          * follows:
 897          *
 898          *    lis r0, r0, KVM_SC_MAGIC_R0@h
 899          *    ori r0, KVM_SC_MAGIC_R0@l
 900          *    sc
 901          *    nop
 902          */
 903         pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
 904         pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask);
 905         pvinfo->hcall[2] = inst_sc;
 906         pvinfo->hcall[3] = inst_nop;
 907 #endif
 908
 909         pvinfo->flags = KVM_PPC_PVINFO_FLAGS_EV_IDLE;
 910
 911         return 0;
 912 }
 913
 914 long kvm_arch_vm_ioctl(struct file *filp,
 915                        unsigned int ioctl, unsigned long arg)
 916 {
 917         void __user *argp = (void __user *)arg;
 918         long r;
 919
 920         switch (ioctl) {
 921         case KVM_PPC_GET_PVINFO: {
 922                 struct kvm_ppc_pvinfo pvinfo;
 923                 memset(&pvinfo, 0, sizeof(pvinfo));
 924                 r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
 925                 if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
 926                         r = -EFAULT;
 927                         goto out;
 928                 }
 929
 930                 break;
 931         }
 932 #ifdef CONFIG_PPC_BOOK3S_64
 933         case KVM_CREATE_SPAPR_TCE: {
 934                 struct kvm_create_spapr_tce create_tce;
 935                 struct kvm *kvm = filp->private_data;
 936
 937                 r = -EFAULT;
 938                 if (copy_from_user(&create_tce, argp, sizeof(create_tce)))
 939                         goto out;
 940                 r = kvm_vm_ioctl_create_spapr_tce(kvm, &create_tce);
 941                 goto out;
 942         }
 943 #endif /* CONFIG_PPC_BOOK3S_64 */
 944
 945 #ifdef CONFIG_KVM_BOOK3S_64_HV
 946         case KVM_ALLOCATE_RMA: {
 947                 struct kvm *kvm = filp->private_data;
 948                 struct kvm_allocate_rma rma;
 949
 950                 r = kvm_vm_ioctl_allocate_rma(kvm, &rma);
 951                 if (r >= 0 && copy_to_user(argp, &rma, sizeof(rma)))
 952                         r = -EFAULT;
 953                 break;
 954         }
 955
 956         case KVM_PPC_ALLOCATE_HTAB: {
 957                 struct kvm *kvm = filp->private_data;
 958                 u32 htab_order;
 959
 960                 r = -EFAULT;
 961                 if (get_user(htab_order, (u32 __user *)argp))
 962                         break;
 963                 r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
 964                 if (r)
 965                         break;
 966                 r = -EFAULT;
 967                 if (put_user(htab_order, (u32 __user *)argp))
 968                         break;
 969                 r = 0;
 970                 break;
 971         }
 972
 973         case KVM_PPC_GET_HTAB_FD: {
 974                 struct kvm *kvm = filp->private_data;
 975                 struct kvm_get_htab_fd ghf;
 976
 977                 r = -EFAULT;
 978                 if (copy_from_user(&ghf, argp, sizeof(ghf)))
 979                         break;
 980                 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
 981                 break;
 982         }
 983 #endif /* CONFIG_KVM_BOOK3S_64_HV */
 984
 985 #ifdef CONFIG_PPC_BOOK3S_64
 986         case KVM_PPC_GET_SMMU_INFO: {
 987                 struct kvm *kvm = filp->private_data;
 988                 struct kvm_ppc_smmu_info info;
 989
 990                 memset(&info, 0, sizeof(info));
 991                 r = kvm_vm_ioctl_get_smmu_info(kvm, &info);
 992                 if (r >= 0 && copy_to_user(argp, &info, sizeof(info)))
 993                         r = -EFAULT;
 994                 break;
 995         }
 996 #endif /* CONFIG_PPC_BOOK3S_64 */
 997         default:
 998                 r = -ENOTTY;
 999         }
1000
1001 out:
1002         return r;
1003 }
1004
1005 static unsigned long lpid_inuse[BITS_TO_LONGS(KVMPPC_NR_LPIDS)];
1006 static unsigned long nr_lpids;
1007
1008 long kvmppc_alloc_lpid(void)
1009 {
1010         long lpid;
1011
1012         do {
1013                 lpid = find_first_zero_bit(lpid_inuse, KVMPPC_NR_LPIDS);
1014                 if (lpid >= nr_lpids) {
1015                         pr_err("%s: No LPIDs free\n", __func__);
1016                         return -ENOMEM;
1017                 }
1018         } while (test_and_set_bit(lpid, lpid_inuse));
1019
1020         return lpid;
1021 }
1022
1023 void kvmppc_claim_lpid(long lpid)
1024 {
1025         set_bit(lpid, lpid_inuse);
1026 }
1027
1028 void kvmppc_free_lpid(long lpid)
1029 {
1030         clear_bit(lpid, lpid_inuse);
1031 }
1032
1033 void kvmppc_init_lpid(unsigned long nr_lpids_param)
1034 {
1035         nr_lpids = min_t(unsigned long, KVMPPC_NR_LPIDS, nr_lpids_param);
1036         memset(lpid_inuse, 0, sizeof(lpid_inuse));
1037 }
1038
1039 int kvm_arch_init(void *opaque)
1040 {
1041         return 0;
1042 }
1043
1044 void kvm_arch_exit(void)
1045 {
1046 }