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 <linux/file.h>
  29 #include <linux/module.h>
  30 #include <asm/cputable.h>
  31 #include <asm/uaccess.h>
  32 #include <asm/kvm_ppc.h>
  33 #include <asm/tlbflush.h>
  34 #include <asm/cputhreads.h>
  35 #include <asm/irqflags.h>
  36 #include "timing.h"
  37 #include "irq.h"
  38 #include "../mm/mmu_decl.h"
  39
  40 #define CREATE_TRACE_POINTS
  41 #include "trace.h"
  42
  43 struct kvmppc_ops *kvmppc_hv_ops;
  44 EXPORT_SYMBOL_GPL(kvmppc_hv_ops);
  45 struct kvmppc_ops *kvmppc_pr_ops;
  46 EXPORT_SYMBOL_GPL(kvmppc_pr_ops);
  47
  48
  49 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  50 {
  51         return !!(v->arch.pending_exceptions) ||
  52                v->requests;
  53 }
  54
  55 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  56 {
  57         return 1;
  58 }
  59
  60 /*
  61  * Common checks before entering the guest world.  Call with interrupts
  62  * disabled.
  63  *
  64  * returns:
  65  *
  66  * == 1 if we're ready to go into guest state
  67  * <= 0 if we need to go back to the host with return value
  68  */
  69 int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
  70 {
  71         int r;
  72
  73         WARN_ON(irqs_disabled());
  74         hard_irq_disable();
  75
  76         while (true) {
  77                 if (need_resched()) {
  78                         local_irq_enable();
  79                         cond_resched();
  80                         hard_irq_disable();
  81                         continue;
  82                 }
  83
  84                 if (signal_pending(current)) {
  85                         kvmppc_account_exit(vcpu, SIGNAL_EXITS);
  86                         vcpu->run->exit_reason = KVM_EXIT_INTR;
  87                         r = -EINTR;
  88                         break;
  89                 }
  90
  91                 vcpu->mode = IN_GUEST_MODE;
  92
  93                 /*
  94                  * Reading vcpu->requests must happen after setting vcpu->mode,
  95                  * so we don't miss a request because the requester sees
  96                  * OUTSIDE_GUEST_MODE and assumes we'll be checking requests
  97                  * before next entering the guest (and thus doesn't IPI).
  98                  */
  99                 smp_mb();
 100
 101                 if (vcpu->requests) {
 102                         /* Make sure we process requests preemptable */
 103                         local_irq_enable();
 104                         trace_kvm_check_requests(vcpu);
 105                         r = kvmppc_core_check_requests(vcpu);
 106                         hard_irq_disable();
 107                         if (r > 0)
 108                                 continue;
 109                         break;
 110                 }
 111
 112                 if (kvmppc_core_prepare_to_enter(vcpu)) {
 113                         /* interrupts got enabled in between, so we
 114                            are back at square 1 */
 115                         continue;
 116                 }
 117
 118                 kvm_guest_enter();
 119                 return 1;
 120         }
 121
 122         /* return to host */
 123         local_irq_enable();
 124         return r;
 125 }
 126 EXPORT_SYMBOL_GPL(kvmppc_prepare_to_enter);
 127
 128 #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE)
 129 static void kvmppc_swab_shared(struct kvm_vcpu *vcpu)
 130 {
 131         struct kvm_vcpu_arch_shared *shared = vcpu->arch.shared;
 132         int i;
 133
 134         shared->sprg0 = swab64(shared->sprg0);
 135         shared->sprg1 = swab64(shared->sprg1);
 136         shared->sprg2 = swab64(shared->sprg2);
 137         shared->sprg3 = swab64(shared->sprg3);
 138         shared->srr0 = swab64(shared->srr0);
 139         shared->srr1 = swab64(shared->srr1);
 140         shared->dar = swab64(shared->dar);
 141         shared->msr = swab64(shared->msr);
 142         shared->dsisr = swab32(shared->dsisr);
 143         shared->int_pending = swab32(shared->int_pending);
 144         for (i = 0; i < ARRAY_SIZE(shared->sr); i++)
 145                 shared->sr[i] = swab32(shared->sr[i]);
 146 }
 147 #endif
 148
 149 int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
 150 {
 151         int nr = kvmppc_get_gpr(vcpu, 11);
 152         int r;
 153         unsigned long __maybe_unused param1 = kvmppc_get_gpr(vcpu, 3);
 154         unsigned long __maybe_unused param2 = kvmppc_get_gpr(vcpu, 4);
 155         unsigned long __maybe_unused param3 = kvmppc_get_gpr(vcpu, 5);
 156         unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
 157         unsigned long r2 = 0;
 158
 159         if (!(kvmppc_get_msr(vcpu) & MSR_SF)) {
 160                 /* 32 bit mode */
 161                 param1 &= 0xffffffff;
 162                 param2 &= 0xffffffff;
 163                 param3 &= 0xffffffff;
 164                 param4 &= 0xffffffff;
 165         }
 166
 167         switch (nr) {
 168         case KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE):
 169         {
 170 #if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE)
 171                 /* Book3S can be little endian, find it out here */
 172                 int shared_big_endian = true;
 173                 if (vcpu->arch.intr_msr & MSR_LE)
 174                         shared_big_endian = false;
 175                 if (shared_big_endian != vcpu->arch.shared_big_endian)
 176                         kvmppc_swab_shared(vcpu);
 177                 vcpu->arch.shared_big_endian = shared_big_endian;
 178 #endif
 179
 180                 if (!(param2 & MAGIC_PAGE_FLAG_NOT_MAPPED_NX)) {
 181                         /*
 182                          * Older versions of the Linux magic page code had
 183                          * a bug where they would map their trampoline code
 184                          * NX. If that's the case, remove !PR NX capability.
 185                          */
 186                         vcpu->arch.disable_kernel_nx = true;
 187                         kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
 188                 }
 189
 190                 vcpu->arch.magic_page_pa = param1 & ~0xfffULL;
 191                 vcpu->arch.magic_page_ea = param2 & ~0xfffULL;
 192
 193                 r2 = KVM_MAGIC_FEAT_SR | KVM_MAGIC_FEAT_MAS0_TO_SPRG7;
 194
 195                 r = EV_SUCCESS;
 196                 break;
 197         }
 198         case KVM_HCALL_TOKEN(KVM_HC_FEATURES):
 199                 r = EV_SUCCESS;
 200 #if defined(CONFIG_PPC_BOOK3S) || defined(CONFIG_KVM_E500V2)
 201                 /* XXX Missing magic page on 44x */
 202                 r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
 203 #endif
 204
 205                 /* Second return value is in r4 */
 206                 break;
 207         case EV_HCALL_TOKEN(EV_IDLE):
 208                 r = EV_SUCCESS;
 209                 kvm_vcpu_block(vcpu);
 210                 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
 211                 break;
 212         default:
 213                 r = EV_UNIMPLEMENTED;
 214                 break;
 215         }
 216
 217         kvmppc_set_gpr(vcpu, 4, r2);
 218
 219         return r;
 220 }
 221 EXPORT_SYMBOL_GPL(kvmppc_kvm_pv);
 222
 223 int kvmppc_sanity_check(struct kvm_vcpu *vcpu)
 224 {
 225         int r = false;
 226
 227         /* We have to know what CPU to virtualize */
 228         if (!vcpu->arch.pvr)
 229                 goto out;
 230
 231         /* PAPR only works with book3s_64 */
 232         if ((vcpu->arch.cpu_type != KVM_CPU_3S_64) && vcpu->arch.papr_enabled)
 233                 goto out;
 234
 235         /* HV KVM can only do PAPR mode for now */
 236         if (!vcpu->arch.papr_enabled && is_kvmppc_hv_enabled(vcpu->kvm))
 237                 goto out;
 238
 239 #ifdef CONFIG_KVM_BOOKE_HV
 240         if (!cpu_has_feature(CPU_FTR_EMB_HV))
 241                 goto out;
 242 #endif
 243
 244         r = true;
 245
 246 out:
 247         vcpu->arch.sane = r;
 248         return r ? 0 : -EINVAL;
 249 }
 250 EXPORT_SYMBOL_GPL(kvmppc_sanity_check);
 251
 252 int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
 253 {
 254         enum emulation_result er;
 255         int r;
 256
 257         er = kvmppc_emulate_instruction(run, vcpu);
 258         switch (er) {
 259         case EMULATE_DONE:
 260                 /* Future optimization: only reload non-volatiles if they were
 261                  * actually modified. */
 262                 r = RESUME_GUEST_NV;
 263                 break;
 264         case EMULATE_DO_MMIO:
 265                 run->exit_reason = KVM_EXIT_MMIO;
 266                 /* We must reload nonvolatiles because "update" load/store
 267                  * instructions modify register state. */
 268                 /* Future optimization: only reload non-volatiles if they were
 269                  * actually modified. */
 270                 r = RESUME_HOST_NV;
 271                 break;
 272         case EMULATE_FAIL:
 273                 /* XXX Deliver Program interrupt to guest. */
 274                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
 275                        kvmppc_get_last_inst(vcpu));
 276                 r = RESUME_HOST;
 277                 break;
 278         default:
 279                 WARN_ON(1);
 280                 r = RESUME_GUEST;
 281         }
 282
 283         return r;
 284 }
 285 EXPORT_SYMBOL_GPL(kvmppc_emulate_mmio);
 286
 287 int kvm_arch_hardware_enable(void *garbage)
 288 {
 289         return 0;
 290 }
 291
 292 void kvm_arch_hardware_disable(void *garbage)
 293 {
 294 }
 295
 296 int kvm_arch_hardware_setup(void)
 297 {
 298         return 0;
 299 }
 300
 301 void kvm_arch_hardware_unsetup(void)
 302 {
 303 }
 304
 305 void kvm_arch_check_processor_compat(void *rtn)
 306 {
 307         *(int *)rtn = kvmppc_core_check_processor_compat();
 308 }
 309
 310 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 311 {
 312         struct kvmppc_ops *kvm_ops = NULL;
 313         /*
 314          * if we have both HV and PR enabled, default is HV
 315          */
 316         if (type == 0) {
 317                 if (kvmppc_hv_ops)
 318                         kvm_ops = kvmppc_hv_ops;
 319                 else
 320                         kvm_ops = kvmppc_pr_ops;
 321                 if (!kvm_ops)
 322                         goto err_out;
 323         } else  if (type == KVM_VM_PPC_HV) {
 324                 if (!kvmppc_hv_ops)
 325                         goto err_out;
 326                 kvm_ops = kvmppc_hv_ops;
 327         } else if (type == KVM_VM_PPC_PR) {
 328                 if (!kvmppc_pr_ops)
 329                         goto err_out;
 330                 kvm_ops = kvmppc_pr_ops;
 331         } else
 332                 goto err_out;
 333
 334         if (kvm_ops->owner && !try_module_get(kvm_ops->owner))
 335                 return -ENOENT;
 336
 337         kvm->arch.kvm_ops = kvm_ops;
 338         return kvmppc_core_init_vm(kvm);
 339 err_out:
 340         return -EINVAL;
 341 }
 342
 343 void kvm_arch_destroy_vm(struct kvm *kvm)
 344 {
 345         unsigned int i;
 346         struct kvm_vcpu *vcpu;
 347
 348         kvm_for_each_vcpu(i, vcpu, kvm)
 349                 kvm_arch_vcpu_free(vcpu);
 350
 351         mutex_lock(&kvm->lock);
 352         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 353                 kvm->vcpus[i] = NULL;
 354
 355         atomic_set(&kvm->online_vcpus, 0);
 356
 357         kvmppc_core_destroy_vm(kvm);
 358
 359         mutex_unlock(&kvm->lock);
 360
 361         /* drop the module reference */
 362         module_put(kvm->arch.kvm_ops->owner);
 363 }
 364
 365 void kvm_arch_sync_events(struct kvm *kvm)
 366 {
 367 }
 368
 369 int kvm_dev_ioctl_check_extension(long ext)
 370 {
 371         int r;
 372         /* FIXME!!
 373          * Should some of this be vm ioctl ? is it possible now ?
 374          */
 375         int hv_enabled = kvmppc_hv_ops ? 1 : 0;
 376
 377         switch (ext) {
 378 #ifdef CONFIG_BOOKE
 379         case KVM_CAP_PPC_BOOKE_SREGS:
 380         case KVM_CAP_PPC_BOOKE_WATCHDOG:
 381         case KVM_CAP_PPC_EPR:
 382 #else
 383         case KVM_CAP_PPC_SEGSTATE:
 384         case KVM_CAP_PPC_HIOR:
 385         case KVM_CAP_PPC_PAPR:
 386 #endif
 387         case KVM_CAP_PPC_UNSET_IRQ:
 388         case KVM_CAP_PPC_IRQ_LEVEL:
 389         case KVM_CAP_ENABLE_CAP:
 390         case KVM_CAP_ENABLE_CAP_VM:
 391         case KVM_CAP_ONE_REG:
 392         case KVM_CAP_IOEVENTFD:
 393         case KVM_CAP_DEVICE_CTRL:
 394                 r = 1;
 395                 break;
 396         case KVM_CAP_PPC_PAIRED_SINGLES:
 397         case KVM_CAP_PPC_OSI:
 398         case KVM_CAP_PPC_GET_PVINFO:
 399 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 400         case KVM_CAP_SW_TLB:
 401 #endif
 402                 /* We support this only for PR */
 403                 r = !hv_enabled;
 404                 break;
 405 #ifdef CONFIG_KVM_MMIO
 406         case KVM_CAP_COALESCED_MMIO:
 407                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 408                 break;
 409 #endif
 410 #ifdef CONFIG_KVM_MPIC
 411         case KVM_CAP_IRQ_MPIC:
 412                 r = 1;
 413                 break;
 414 #endif
 415
 416 #ifdef CONFIG_PPC_BOOK3S_64
 417         case KVM_CAP_SPAPR_TCE:
 418         case KVM_CAP_PPC_ALLOC_HTAB:
 419         case KVM_CAP_PPC_RTAS:
 420         case KVM_CAP_PPC_FIXUP_HCALL:
 421         case KVM_CAP_PPC_ENABLE_HCALL:
 422 #ifdef CONFIG_KVM_XICS
 423         case KVM_CAP_IRQ_XICS:
 424 #endif
 425                 r = 1;
 426                 break;
 427 #endif /* CONFIG_PPC_BOOK3S_64 */
 428 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 429         case KVM_CAP_PPC_SMT:
 430                 if (hv_enabled)
 431                         r = threads_per_subcore;
 432                 else
 433                         r = 0;
 434                 break;
 435         case KVM_CAP_PPC_RMA:
 436                 r = hv_enabled;
 437                 /* PPC970 requires an RMA */
 438                 if (r && cpu_has_feature(CPU_FTR_ARCH_201))
 439                         r = 2;
 440                 break;
 441 #endif
 442         case KVM_CAP_SYNC_MMU:
 443 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 444                 if (hv_enabled)
 445                         r = cpu_has_feature(CPU_FTR_ARCH_206) ? 1 : 0;
 446                 else
 447                         r = 0;
 448 #elif defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 449                 r = 1;
 450 #else
 451                 r = 0;
 452 #endif
 453                 break;
 454 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
 455         case KVM_CAP_PPC_HTAB_FD:
 456                 r = hv_enabled;
 457                 break;
 458 #endif
 459         case KVM_CAP_NR_VCPUS:
 460                 /*
 461                  * Recommending a number of CPUs is somewhat arbitrary; we
 462                  * return the number of present CPUs for -HV (since a host
 463                  * will have secondary threads "offline"), and for other KVM
 464                  * implementations just count online CPUs.
 465                  */
 466                 if (hv_enabled)
 467                         r = num_present_cpus();
 468                 else
 469                         r = num_online_cpus();
 470                 break;
 471         case KVM_CAP_MAX_VCPUS:
 472                 r = KVM_MAX_VCPUS;
 473                 break;
 474 #ifdef CONFIG_PPC_BOOK3S_64
 475         case KVM_CAP_PPC_GET_SMMU_INFO:
 476                 r = 1;
 477                 break;
 478 #endif
 479         default:
 480                 r = 0;
 481                 break;
 482         }
 483         return r;
 484
 485 }
 486
 487 long kvm_arch_dev_ioctl(struct file *filp,
 488                         unsigned int ioctl, unsigned long arg)
 489 {
 490         return -EINVAL;
 491 }
 492
 493 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
 494                            struct kvm_memory_slot *dont)
 495 {
 496         kvmppc_core_free_memslot(kvm, free, dont);
 497 }
 498
 499 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
 500                             unsigned long npages)
 501 {
 502         return kvmppc_core_create_memslot(kvm, slot, npages);
 503 }
 504
 505 void kvm_arch_memslots_updated(struct kvm *kvm)
 506 {
 507 }
 508
 509 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 510                                    struct kvm_memory_slot *memslot,
 511                                    struct kvm_userspace_memory_region *mem,
 512                                    enum kvm_mr_change change)
 513 {
 514         return kvmppc_core_prepare_memory_region(kvm, memslot, mem);
 515 }
 516
 517 void kvm_arch_commit_memory_region(struct kvm *kvm,
 518                                    struct kvm_userspace_memory_region *mem,
 519                                    const struct kvm_memory_slot *old,
 520                                    enum kvm_mr_change change)
 521 {
 522         kvmppc_core_commit_memory_region(kvm, mem, old);
 523 }
 524
 525 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 526 {
 527 }
 528
 529 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 530                                    struct kvm_memory_slot *slot)
 531 {
 532         kvmppc_core_flush_memslot(kvm, slot);
 533 }
 534
 535 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 536 {
 537         struct kvm_vcpu *vcpu;
 538         vcpu = kvmppc_core_vcpu_create(kvm, id);
 539         if (!IS_ERR(vcpu)) {
 540                 vcpu->arch.wqp = &vcpu->wq;
 541                 kvmppc_create_vcpu_debugfs(vcpu, id);
 542         }
 543         return vcpu;
 544 }
 545
 546 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 547 {
 548         return 0;
 549 }
 550
 551 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 552 {
 553         /* Make sure we're not using the vcpu anymore */
 554         hrtimer_cancel(&vcpu->arch.dec_timer);
 555         tasklet_kill(&vcpu->arch.tasklet);
 556
 557         kvmppc_remove_vcpu_debugfs(vcpu);
 558
 559         switch (vcpu->arch.irq_type) {
 560         case KVMPPC_IRQ_MPIC:
 561                 kvmppc_mpic_disconnect_vcpu(vcpu->arch.mpic, vcpu);
 562                 break;
 563         case KVMPPC_IRQ_XICS:
 564                 kvmppc_xics_free_icp(vcpu);
 565                 break;
 566         }
 567
 568         kvmppc_core_vcpu_free(vcpu);
 569 }
 570
 571 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 572 {
 573         kvm_arch_vcpu_free(vcpu);
 574 }
 575
 576 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 577 {
 578         return kvmppc_core_pending_dec(vcpu);
 579 }
 580
 581 /*
 582  * low level hrtimer wake routine. Because this runs in hardirq context
 583  * we schedule a tasklet to do the real work.
 584  */
 585 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 586 {
 587         struct kvm_vcpu *vcpu;
 588
 589         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 590         tasklet_schedule(&vcpu->arch.tasklet);
 591
 592         return HRTIMER_NORESTART;
 593 }
 594
 595 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 596 {
 597         int ret;
 598
 599         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 600         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 601         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 602         vcpu->arch.dec_expires = ~(u64)0;
 603
 604 #ifdef CONFIG_KVM_EXIT_TIMING
 605         mutex_init(&vcpu->arch.exit_timing_lock);
 606 #endif
 607         ret = kvmppc_subarch_vcpu_init(vcpu);
 608         return ret;
 609 }
 610
 611 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 612 {
 613         kvmppc_mmu_destroy(vcpu);
 614         kvmppc_subarch_vcpu_uninit(vcpu);
 615 }
 616
 617 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 618 {
 619 #ifdef CONFIG_BOOKE
 620         /*
 621          * vrsave (formerly usprg0) isn't used by Linux, but may
 622          * be used by the guest.
 623          *
 624          * On non-booke this is associated with Altivec and
 625          * is handled by code in book3s.c.
 626          */
 627         mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
 628 #endif
 629         kvmppc_core_vcpu_load(vcpu, cpu);
 630 }
 631
 632 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 633 {
 634         kvmppc_core_vcpu_put(vcpu);
 635 #ifdef CONFIG_BOOKE
 636         vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
 637 #endif
 638 }
 639
 640 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 641                                      struct kvm_run *run)
 642 {
 643         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 644 }
 645
 646 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 647                                       struct kvm_run *run)
 648 {
 649         u64 uninitialized_var(gpr);
 650
 651         if (run->mmio.len > sizeof(gpr)) {
 652                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 653                 return;
 654         }
 655
 656         if (vcpu->arch.mmio_is_bigendian) {
 657                 switch (run->mmio.len) {
 658                 case 8: gpr = *(u64 *)run->mmio.data; break;
 659                 case 4: gpr = *(u32 *)run->mmio.data; break;
 660                 case 2: gpr = *(u16 *)run->mmio.data; break;
 661                 case 1: gpr = *(u8 *)run->mmio.data; break;
 662                 }
 663         } else {
 664                 /* Convert BE data from userland back to LE. */
 665                 switch (run->mmio.len) {
 666                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 667                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 668                 case 1: gpr = *(u8 *)run->mmio.data; break;
 669                 }
 670         }
 671
 672         if (vcpu->arch.mmio_sign_extend) {
 673                 switch (run->mmio.len) {
 674 #ifdef CONFIG_PPC64
 675                 case 4:
 676                         gpr = (s64)(s32)gpr;
 677                         break;
 678 #endif
 679                 case 2:
 680                         gpr = (s64)(s16)gpr;
 681                         break;
 682                 case 1:
 683                         gpr = (s64)(s8)gpr;
 684                         break;
 685                 }
 686         }
 687
 688         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 689
 690         switch (vcpu->arch.io_gpr & KVM_MMIO_REG_EXT_MASK) {
 691         case KVM_MMIO_REG_GPR:
 692                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 693                 break;
 694         case KVM_MMIO_REG_FPR:
 695                 VCPU_FPR(vcpu, vcpu->arch.io_gpr & KVM_MMIO_REG_MASK) = gpr;
 696                 break;
 697 #ifdef CONFIG_PPC_BOOK3S
 698         case KVM_MMIO_REG_QPR:
 699                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 700                 break;
 701         case KVM_MMIO_REG_FQPR:
 702                 VCPU_FPR(vcpu, vcpu->arch.io_gpr & KVM_MMIO_REG_MASK) = gpr;
 703                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 704                 break;
 705 #endif
 706         default:
 707                 BUG();
 708         }
 709 }
 710
 711 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 712                        unsigned int rt, unsigned int bytes,
 713                        int is_default_endian)
 714 {
 715         int idx, ret;
 716         int is_bigendian;
 717
 718         if (kvmppc_need_byteswap(vcpu)) {
 719                 /* Default endianness is "little endian". */
 720                 is_bigendian = !is_default_endian;
 721         } else {
 722                 /* Default endianness is "big endian". */
 723                 is_bigendian = is_default_endian;
 724         }
 725
 726         if (bytes > sizeof(run->mmio.data)) {
 727                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 728                        run->mmio.len);
 729         }
 730
 731         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 732         run->mmio.len = bytes;
 733         run->mmio.is_write = 0;
 734
 735         vcpu->arch.io_gpr = rt;
 736         vcpu->arch.mmio_is_bigendian = is_bigendian;
 737         vcpu->mmio_needed = 1;
 738         vcpu->mmio_is_write = 0;
 739         vcpu->arch.mmio_sign_extend = 0;
 740
 741         idx = srcu_read_lock(&vcpu->kvm->srcu);
 742
 743         ret = kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
 744                               bytes, &run->mmio.data);
 745
 746         srcu_read_unlock(&vcpu->kvm->srcu, idx);
 747
 748         if (!ret) {
 749                 kvmppc_complete_mmio_load(vcpu, run);
 750                 vcpu->mmio_needed = 0;
 751                 return EMULATE_DONE;
 752         }
 753
 754         return EMULATE_DO_MMIO;
 755 }
 756 EXPORT_SYMBOL_GPL(kvmppc_handle_load);
 757
 758 /* Same as above, but sign extends */
 759 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 760                         unsigned int rt, unsigned int bytes,
 761                         int is_default_endian)
 762 {
 763         int r;
 764
 765         vcpu->arch.mmio_sign_extend = 1;
 766         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_default_endian);
 767
 768         return r;
 769 }
 770
 771 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 772                         u64 val, unsigned int bytes, int is_default_endian)
 773 {
 774         void *data = run->mmio.data;
 775         int idx, ret;
 776         int is_bigendian;
 777
 778         if (kvmppc_need_byteswap(vcpu)) {
 779                 /* Default endianness is "little endian". */
 780                 is_bigendian = !is_default_endian;
 781         } else {
 782                 /* Default endianness is "big endian". */
 783                 is_bigendian = is_default_endian;
 784         }
 785
 786         if (bytes > sizeof(run->mmio.data)) {
 787                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 788                        run->mmio.len);
 789         }
 790
 791         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 792         run->mmio.len = bytes;
 793         run->mmio.is_write = 1;
 794         vcpu->mmio_needed = 1;
 795         vcpu->mmio_is_write = 1;
 796
 797         /* Store the value at the lowest bytes in 'data'. */
 798         if (is_bigendian) {
 799                 switch (bytes) {
 800                 case 8: *(u64 *)data = val; break;
 801                 case 4: *(u32 *)data = val; break;
 802                 case 2: *(u16 *)data = val; break;
 803                 case 1: *(u8  *)data = val; break;
 804                 }
 805         } else {
 806                 /* Store LE value into 'data'. */
 807                 switch (bytes) {
 808                 case 4: st_le32(data, val); break;
 809                 case 2: st_le16(data, val); break;
 810                 case 1: *(u8 *)data = val; break;
 811                 }
 812         }
 813
 814         idx = srcu_read_lock(&vcpu->kvm->srcu);
 815
 816         ret = kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
 817                                bytes, &run->mmio.data);
 818
 819         srcu_read_unlock(&vcpu->kvm->srcu, idx);
 820
 821         if (!ret) {
 822                 vcpu->mmio_needed = 0;
 823                 return EMULATE_DONE;
 824         }
 825
 826         return EMULATE_DO_MMIO;
 827 }
 828 EXPORT_SYMBOL_GPL(kvmppc_handle_store);
 829
 830 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 831 {
 832         int r;
 833         sigset_t sigsaved;
 834
 835         if (vcpu->sigset_active)
 836                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 837
 838         if (vcpu->mmio_needed) {
 839                 if (!vcpu->mmio_is_write)
 840                         kvmppc_complete_mmio_load(vcpu, run);
 841                 vcpu->mmio_needed = 0;
 842         } else if (vcpu->arch.dcr_needed) {
 843                 if (!vcpu->arch.dcr_is_write)
 844                         kvmppc_complete_dcr_load(vcpu, run);
 845                 vcpu->arch.dcr_needed = 0;
 846         } else if (vcpu->arch.osi_needed) {
 847                 u64 *gprs = run->osi.gprs;
 848                 int i;
 849
 850                 for (i = 0; i < 32; i++)
 851                         kvmppc_set_gpr(vcpu, i, gprs[i]);
 852                 vcpu->arch.osi_needed = 0;
 853         } else if (vcpu->arch.hcall_needed) {
 854                 int i;
 855
 856                 kvmppc_set_gpr(vcpu, 3, run->papr_hcall.ret);
 857                 for (i = 0; i < 9; ++i)
 858                         kvmppc_set_gpr(vcpu, 4 + i, run->papr_hcall.args[i]);
 859                 vcpu->arch.hcall_needed = 0;
 860 #ifdef CONFIG_BOOKE
 861         } else if (vcpu->arch.epr_needed) {
 862                 kvmppc_set_epr(vcpu, run->epr.epr);
 863                 vcpu->arch.epr_needed = 0;
 864 #endif
 865         }
 866
 867         r = kvmppc_vcpu_run(run, vcpu);
 868
 869         if (vcpu->sigset_active)
 870                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 871
 872         return r;
 873 }
 874
 875 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 876 {
 877         if (irq->irq == KVM_INTERRUPT_UNSET) {
 878                 kvmppc_core_dequeue_external(vcpu);
 879                 return 0;
 880         }
 881
 882         kvmppc_core_queue_external(vcpu, irq);
 883
 884         kvm_vcpu_kick(vcpu);
 885
 886         return 0;
 887 }
 888
 889 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 890                                      struct kvm_enable_cap *cap)
 891 {
 892         int r;
 893
 894         if (cap->flags)
 895                 return -EINVAL;
 896
 897         switch (cap->cap) {
 898         case KVM_CAP_PPC_OSI:
 899                 r = 0;
 900                 vcpu->arch.osi_enabled = true;
 901                 break;
 902         case KVM_CAP_PPC_PAPR:
 903                 r = 0;
 904                 vcpu->arch.papr_enabled = true;
 905                 break;
 906         case KVM_CAP_PPC_EPR:
 907                 r = 0;
 908                 if (cap->args[0])
 909                         vcpu->arch.epr_flags |= KVMPPC_EPR_USER;
 910                 else
 911                         vcpu->arch.epr_flags &= ~KVMPPC_EPR_USER;
 912                 break;
 913 #ifdef CONFIG_BOOKE
 914         case KVM_CAP_PPC_BOOKE_WATCHDOG:
 915                 r = 0;
 916                 vcpu->arch.watchdog_enabled = true;
 917                 break;
 918 #endif
 919 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 920         case KVM_CAP_SW_TLB: {
 921                 struct kvm_config_tlb cfg;
 922                 void __user *user_ptr = (void __user *)(uintptr_t)cap->args[0];
 923
 924                 r = -EFAULT;
 925                 if (copy_from_user(&cfg, user_ptr, sizeof(cfg)))
 926                         break;
 927
 928                 r = kvm_vcpu_ioctl_config_tlb(vcpu, &cfg);
 929                 break;
 930         }
 931 #endif
 932 #ifdef CONFIG_KVM_MPIC
 933         case KVM_CAP_IRQ_MPIC: {
 934                 struct fd f;
 935                 struct kvm_device *dev;
 936
 937                 r = -EBADF;
 938                 f = fdget(cap->args[0]);
 939                 if (!f.file)
 940                         break;
 941
 942                 r = -EPERM;
 943                 dev = kvm_device_from_filp(f.file);
 944                 if (dev)
 945                         r = kvmppc_mpic_connect_vcpu(dev, vcpu, cap->args[1]);
 946
 947                 fdput(f);
 948                 break;
 949         }
 950 #endif
 951 #ifdef CONFIG_KVM_XICS
 952         case KVM_CAP_IRQ_XICS: {
 953                 struct fd f;
 954                 struct kvm_device *dev;
 955
 956                 r = -EBADF;
 957                 f = fdget(cap->args[0]);
 958                 if (!f.file)
 959                         break;
 960
 961                 r = -EPERM;
 962                 dev = kvm_device_from_filp(f.file);
 963                 if (dev)
 964                         r = kvmppc_xics_connect_vcpu(dev, vcpu, cap->args[1]);
 965
 966                 fdput(f);
 967                 break;
 968         }
 969 #endif /* CONFIG_KVM_XICS */
 970         default:
 971                 r = -EINVAL;
 972                 break;
 973         }
 974
 975         if (!r)
 976                 r = kvmppc_sanity_check(vcpu);
 977
 978         return r;
 979 }
 980
 981 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 982                                     struct kvm_mp_state *mp_state)
 983 {
 984         return -EINVAL;
 985 }
 986
 987 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 988                                     struct kvm_mp_state *mp_state)
 989 {
 990         return -EINVAL;
 991 }
 992
 993 long kvm_arch_vcpu_ioctl(struct file *filp,
 994                          unsigned int ioctl, unsigned long arg)
 995 {
 996         struct kvm_vcpu *vcpu = filp->private_data;
 997         void __user *argp = (void __user *)arg;
 998         long r;
 999
1000         switch (ioctl) {
1001         case KVM_INTERRUPT: {
1002                 struct kvm_interrupt irq;
1003                 r = -EFAULT;
1004                 if (copy_from_user(&irq, argp, sizeof(irq)))
1005                         goto out;
1006                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
1007                 goto out;
1008         }
1009
1010         case KVM_ENABLE_CAP:
1011         {
1012                 struct kvm_enable_cap cap;
1013                 r = -EFAULT;
1014                 if (copy_from_user(&cap, argp, sizeof(cap)))
1015                         goto out;
1016                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
1017                 break;
1018         }
1019
1020         case KVM_SET_ONE_REG:
1021         case KVM_GET_ONE_REG:
1022         {
1023                 struct kvm_one_reg reg;
1024                 r = -EFAULT;
1025                 if (copy_from_user(&reg, argp, sizeof(reg)))
1026                         goto out;
1027                 if (ioctl == KVM_SET_ONE_REG)
1028                         r = kvm_vcpu_ioctl_set_one_reg(vcpu, &reg);
1029                 else
1030                         r = kvm_vcpu_ioctl_get_one_reg(vcpu, &reg);
1031                 break;
1032         }
1033
1034 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
1035         case KVM_DIRTY_TLB: {
1036                 struct kvm_dirty_tlb dirty;
1037                 r = -EFAULT;
1038                 if (copy_from_user(&dirty, argp, sizeof(dirty)))
1039                         goto out;
1040                 r = kvm_vcpu_ioctl_dirty_tlb(vcpu, &dirty);
1041                 break;
1042         }
1043 #endif
1044         default:
1045                 r = -EINVAL;
1046         }
1047
1048 out:
1049         return r;
1050 }
1051
1052 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
1053 {
1054         return VM_FAULT_SIGBUS;
1055 }
1056
1057 static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
1058 {
1059         u32 inst_nop = 0x60000000;
1060 #ifdef CONFIG_KVM_BOOKE_HV
1061         u32 inst_sc1 = 0x44000022;
1062         pvinfo->hcall[0] = cpu_to_be32(inst_sc1);
1063         pvinfo->hcall[1] = cpu_to_be32(inst_nop);
1064         pvinfo->hcall[2] = cpu_to_be32(inst_nop);
1065         pvinfo->hcall[3] = cpu_to_be32(inst_nop);
1066 #else
1067         u32 inst_lis = 0x3c000000;
1068         u32 inst_ori = 0x60000000;
1069         u32 inst_sc = 0x44000002;
1070         u32 inst_imm_mask = 0xffff;
1071
1072         /*
1073          * The hypercall to get into KVM from within guest context is as
1074          * follows:
1075          *
1076          *    lis r0, r0, KVM_SC_MAGIC_R0@h
1077          *    ori r0, KVM_SC_MAGIC_R0@l
1078          *    sc
1079          *    nop
1080          */
1081         pvinfo->hcall[0] = cpu_to_be32(inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask));
1082         pvinfo->hcall[1] = cpu_to_be32(inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask));
1083         pvinfo->hcall[2] = cpu_to_be32(inst_sc);
1084         pvinfo->hcall[3] = cpu_to_be32(inst_nop);
1085 #endif
1086
1087         pvinfo->flags = KVM_PPC_PVINFO_FLAGS_EV_IDLE;
1088
1089         return 0;
1090 }
1091
1092 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event,
1093                           bool line_status)
1094 {
1095         if (!irqchip_in_kernel(kvm))
1096                 return -ENXIO;
1097
1098         irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
1099                                         irq_event->irq, irq_event->level,
1100                                         line_status);
1101         return 0;
1102 }
1103
1104
1105 static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
1106                                    struct kvm_enable_cap *cap)
1107 {
1108         int r;
1109
1110         if (cap->flags)
1111                 return -EINVAL;
1112
1113         switch (cap->cap) {
1114 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
1115         case KVM_CAP_PPC_ENABLE_HCALL: {
1116                 unsigned long hcall = cap->args[0];
1117
1118                 r = -EINVAL;
1119                 if (hcall > MAX_HCALL_OPCODE || (hcall & 3) ||
1120                     cap->args[1] > 1)
1121                         break;
1122                 if (cap->args[1])
1123                         set_bit(hcall / 4, kvm->arch.enabled_hcalls);
1124                 else
1125                         clear_bit(hcall / 4, kvm->arch.enabled_hcalls);
1126                 r = 0;
1127                 break;
1128         }
1129 #endif
1130         default:
1131                 r = -EINVAL;
1132                 break;
1133         }
1134
1135         return r;
1136 }
1137
1138 long kvm_arch_vm_ioctl(struct file *filp,
1139                        unsigned int ioctl, unsigned long arg)
1140 {
1141         struct kvm *kvm __maybe_unused = filp->private_data;
1142         void __user *argp = (void __user *)arg;
1143         long r;
1144
1145         switch (ioctl) {
1146         case KVM_PPC_GET_PVINFO: {
1147                 struct kvm_ppc_pvinfo pvinfo;
1148                 memset(&pvinfo, 0, sizeof(pvinfo));
1149                 r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
1150                 if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
1151                         r = -EFAULT;
1152                         goto out;
1153                 }
1154
1155                 break;
1156         }
1157         case KVM_ENABLE_CAP:
1158         {
1159                 struct kvm_enable_cap cap;
1160                 r = -EFAULT;
1161                 if (copy_from_user(&cap, argp, sizeof(cap)))
1162                         goto out;
1163                 r = kvm_vm_ioctl_enable_cap(kvm, &cap);
1164                 break;
1165         }
1166 #ifdef CONFIG_PPC_BOOK3S_64
1167         case KVM_CREATE_SPAPR_TCE: {
1168                 struct kvm_create_spapr_tce create_tce;
1169
1170                 r = -EFAULT;
1171                 if (copy_from_user(&create_tce, argp, sizeof(create_tce)))
1172                         goto out;
1173                 r = kvm_vm_ioctl_create_spapr_tce(kvm, &create_tce);
1174                 goto out;
1175         }
1176         case KVM_PPC_GET_SMMU_INFO: {
1177                 struct kvm_ppc_smmu_info info;
1178                 struct kvm *kvm = filp->private_data;
1179
1180                 memset(&info, 0, sizeof(info));
1181                 r = kvm->arch.kvm_ops->get_smmu_info(kvm, &info);
1182                 if (r >= 0 && copy_to_user(argp, &info, sizeof(info)))
1183                         r = -EFAULT;
1184                 break;
1185         }
1186         case KVM_PPC_RTAS_DEFINE_TOKEN: {
1187                 struct kvm *kvm = filp->private_data;
1188
1189                 r = kvm_vm_ioctl_rtas_define_token(kvm, argp);
1190                 break;
1191         }
1192         default: {
1193                 struct kvm *kvm = filp->private_data;
1194                 r = kvm->arch.kvm_ops->arch_vm_ioctl(filp, ioctl, arg);
1195         }
1196 #else /* CONFIG_PPC_BOOK3S_64 */
1197         default:
1198                 r = -ENOTTY;
1199 #endif
1200         }
1201 out:
1202         return r;
1203 }
1204
1205 static unsigned long lpid_inuse[BITS_TO_LONGS(KVMPPC_NR_LPIDS)];
1206 static unsigned long nr_lpids;
1207
1208 long kvmppc_alloc_lpid(void)
1209 {
1210         long lpid;
1211
1212         do {
1213                 lpid = find_first_zero_bit(lpid_inuse, KVMPPC_NR_LPIDS);
1214                 if (lpid >= nr_lpids) {
1215                         pr_err("%s: No LPIDs free\n", __func__);
1216                         return -ENOMEM;
1217                 }
1218         } while (test_and_set_bit(lpid, lpid_inuse));
1219
1220         return lpid;
1221 }
1222 EXPORT_SYMBOL_GPL(kvmppc_alloc_lpid);
1223
1224 void kvmppc_claim_lpid(long lpid)
1225 {
1226         set_bit(lpid, lpid_inuse);
1227 }
1228 EXPORT_SYMBOL_GPL(kvmppc_claim_lpid);
1229
1230 void kvmppc_free_lpid(long lpid)
1231 {
1232         clear_bit(lpid, lpid_inuse);
1233 }
1234 EXPORT_SYMBOL_GPL(kvmppc_free_lpid);
1235
1236 void kvmppc_init_lpid(unsigned long nr_lpids_param)
1237 {
1238         nr_lpids = min_t(unsigned long, KVMPPC_NR_LPIDS, nr_lpids_param);
1239         memset(lpid_inuse, 0, sizeof(lpid_inuse));
1240 }
1241 EXPORT_SYMBOL_GPL(kvmppc_init_lpid);
1242
1243 int kvm_arch_init(void *opaque)
1244 {
1245         return 0;
1246 }
1247
1248 void kvm_arch_exit(void)
1249 {
1250
1251 }