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 <asm/cputable.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/kvm_ppc.h>
  32 #include <asm/tlbflush.h>
  33 #include <asm/cputhreads.h>
  34 #include <asm/irqflags.h>
  35 #include "timing.h"
  36 #include "irq.h"
  37 #include "../mm/mmu_decl.h"
  38
  39 #define CREATE_TRACE_POINTS
  40 #include "trace.h"
  41
  42 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
  43 {
  44         return !!(v->arch.pending_exceptions) ||
  45                v->requests;
  46 }
  47
  48 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
  49 {
  50         return 1;
  51 }
  52
  53 #ifndef CONFIG_KVM_BOOK3S_64_HV
  54 /*
  55  * Common checks before entering the guest world.  Call with interrupts
  56  * disabled.
  57  *
  58  * returns:
  59  *
  60  * == 1 if we're ready to go into guest state
  61  * <= 0 if we need to go back to the host with return value
  62  */
  63 int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
  64 {
  65         int r = 1;
  66
  67         WARN_ON_ONCE(!irqs_disabled());
  68         while (true) {
  69                 if (need_resched()) {
  70                         local_irq_enable();
  71                         cond_resched();
  72                         local_irq_disable();
  73                         continue;
  74                 }
  75
  76                 if (signal_pending(current)) {
  77                         kvmppc_account_exit(vcpu, SIGNAL_EXITS);
  78                         vcpu->run->exit_reason = KVM_EXIT_INTR;
  79                         r = -EINTR;
  80                         break;
  81                 }
  82
  83                 vcpu->mode = IN_GUEST_MODE;
  84
  85                 /*
  86                  * Reading vcpu->requests must happen after setting vcpu->mode,
  87                  * so we don't miss a request because the requester sees
  88                  * OUTSIDE_GUEST_MODE and assumes we'll be checking requests
  89                  * before next entering the guest (and thus doesn't IPI).
  90                  */
  91                 smp_mb();
  92
  93                 if (vcpu->requests) {
  94                         /* Make sure we process requests preemptable */
  95                         local_irq_enable();
  96                         trace_kvm_check_requests(vcpu);
  97                         r = kvmppc_core_check_requests(vcpu);
  98                         local_irq_disable();
  99                         if (r > 0)
 100                                 continue;
 101                         break;
 102                 }
 103
 104                 if (kvmppc_core_prepare_to_enter(vcpu)) {
 105                         /* interrupts got enabled in between, so we
 106                            are back at square 1 */
 107                         continue;
 108                 }
 109
 110 #ifdef CONFIG_PPC64
 111                 /* lazy EE magic */
 112                 hard_irq_disable();
 113                 if (lazy_irq_pending()) {
 114                         /* Got an interrupt in between, try again */
 115                         local_irq_enable();
 116                         local_irq_disable();
 117                         kvm_guest_exit();
 118                         continue;
 119                 }
 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         case KVM_CAP_DEVICE_CTRL:
 321                 r = 1;
 322                 break;
 323 #ifndef CONFIG_KVM_BOOK3S_64_HV
 324         case KVM_CAP_PPC_PAIRED_SINGLES:
 325         case KVM_CAP_PPC_OSI:
 326         case KVM_CAP_PPC_GET_PVINFO:
 327 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 328         case KVM_CAP_SW_TLB:
 329 #endif
 330 #ifdef CONFIG_KVM_MPIC
 331         case KVM_CAP_IRQ_MPIC:
 332 #endif
 333                 r = 1;
 334                 break;
 335         case KVM_CAP_COALESCED_MMIO:
 336                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 337                 break;
 338 #endif
 339 #ifdef CONFIG_PPC_BOOK3S_64
 340         case KVM_CAP_SPAPR_TCE:
 341         case KVM_CAP_PPC_ALLOC_HTAB:
 342         case KVM_CAP_PPC_RTAS:
 343 #ifdef CONFIG_KVM_XICS
 344         case KVM_CAP_IRQ_XICS:
 345 #endif
 346                 r = 1;
 347                 break;
 348 #endif /* CONFIG_PPC_BOOK3S_64 */
 349 #ifdef CONFIG_KVM_BOOK3S_64_HV
 350         case KVM_CAP_PPC_SMT:
 351                 r = threads_per_core;
 352                 break;
 353         case KVM_CAP_PPC_RMA:
 354                 r = 1;
 355                 /* PPC970 requires an RMA */
 356                 if (cpu_has_feature(CPU_FTR_ARCH_201))
 357                         r = 2;
 358                 break;
 359 #endif
 360         case KVM_CAP_SYNC_MMU:
 361 #ifdef CONFIG_KVM_BOOK3S_64_HV
 362                 r = cpu_has_feature(CPU_FTR_ARCH_206) ? 1 : 0;
 363 #elif defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 364                 r = 1;
 365 #else
 366                 r = 0;
 367                 break;
 368 #endif
 369 #ifdef CONFIG_KVM_BOOK3S_64_HV
 370         case KVM_CAP_PPC_HTAB_FD:
 371                 r = 1;
 372                 break;
 373 #endif
 374                 break;
 375         case KVM_CAP_NR_VCPUS:
 376                 /*
 377                  * Recommending a number of CPUs is somewhat arbitrary; we
 378                  * return the number of present CPUs for -HV (since a host
 379                  * will have secondary threads "offline"), and for other KVM
 380                  * implementations just count online CPUs.
 381                  */
 382 #ifdef CONFIG_KVM_BOOK3S_64_HV
 383                 r = num_present_cpus();
 384 #else
 385                 r = num_online_cpus();
 386 #endif
 387                 break;
 388         case KVM_CAP_MAX_VCPUS:
 389                 r = KVM_MAX_VCPUS;
 390                 break;
 391 #ifdef CONFIG_PPC_BOOK3S_64
 392         case KVM_CAP_PPC_GET_SMMU_INFO:
 393                 r = 1;
 394                 break;
 395 #endif
 396         default:
 397                 r = 0;
 398                 break;
 399         }
 400         return r;
 401
 402 }
 403
 404 long kvm_arch_dev_ioctl(struct file *filp,
 405                         unsigned int ioctl, unsigned long arg)
 406 {
 407         return -EINVAL;
 408 }
 409
 410 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 411                            struct kvm_memory_slot *dont)
 412 {
 413         kvmppc_core_free_memslot(free, dont);
 414 }
 415
 416 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
 417 {
 418         return kvmppc_core_create_memslot(slot, npages);
 419 }
 420
 421 void kvm_arch_memslots_updated(struct kvm *kvm)
 422 {
 423 }
 424
 425 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 426                                    struct kvm_memory_slot *memslot,
 427                                    struct kvm_userspace_memory_region *mem,
 428                                    enum kvm_mr_change change)
 429 {
 430         return kvmppc_core_prepare_memory_region(kvm, memslot, mem);
 431 }
 432
 433 void kvm_arch_commit_memory_region(struct kvm *kvm,
 434                                    struct kvm_userspace_memory_region *mem,
 435                                    const struct kvm_memory_slot *old,
 436                                    enum kvm_mr_change change)
 437 {
 438         kvmppc_core_commit_memory_region(kvm, mem, old);
 439 }
 440
 441 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 442 {
 443 }
 444
 445 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 446                                    struct kvm_memory_slot *slot)
 447 {
 448         kvmppc_core_flush_memslot(kvm, slot);
 449 }
 450
 451 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 452 {
 453         struct kvm_vcpu *vcpu;
 454         vcpu = kvmppc_core_vcpu_create(kvm, id);
 455         if (!IS_ERR(vcpu)) {
 456                 vcpu->arch.wqp = &vcpu->wq;
 457                 kvmppc_create_vcpu_debugfs(vcpu, id);
 458         }
 459         return vcpu;
 460 }
 461
 462 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 463 {
 464         return 0;
 465 }
 466
 467 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 468 {
 469         /* Make sure we're not using the vcpu anymore */
 470         hrtimer_cancel(&vcpu->arch.dec_timer);
 471         tasklet_kill(&vcpu->arch.tasklet);
 472
 473         kvmppc_remove_vcpu_debugfs(vcpu);
 474
 475         switch (vcpu->arch.irq_type) {
 476         case KVMPPC_IRQ_MPIC:
 477                 kvmppc_mpic_disconnect_vcpu(vcpu->arch.mpic, vcpu);
 478                 break;
 479         case KVMPPC_IRQ_XICS:
 480                 kvmppc_xics_free_icp(vcpu);
 481                 break;
 482         }
 483
 484         kvmppc_core_vcpu_free(vcpu);
 485 }
 486
 487 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 488 {
 489         kvm_arch_vcpu_free(vcpu);
 490 }
 491
 492 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 493 {
 494         return kvmppc_core_pending_dec(vcpu);
 495 }
 496
 497 /*
 498  * low level hrtimer wake routine. Because this runs in hardirq context
 499  * we schedule a tasklet to do the real work.
 500  */
 501 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 502 {
 503         struct kvm_vcpu *vcpu;
 504
 505         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 506         tasklet_schedule(&vcpu->arch.tasklet);
 507
 508         return HRTIMER_NORESTART;
 509 }
 510
 511 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 512 {
 513         int ret;
 514
 515         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 516         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 517         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 518         vcpu->arch.dec_expires = ~(u64)0;
 519
 520 #ifdef CONFIG_KVM_EXIT_TIMING
 521         mutex_init(&vcpu->arch.exit_timing_lock);
 522 #endif
 523         ret = kvmppc_subarch_vcpu_init(vcpu);
 524         return ret;
 525 }
 526
 527 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 528 {
 529         kvmppc_mmu_destroy(vcpu);
 530         kvmppc_subarch_vcpu_uninit(vcpu);
 531 }
 532
 533 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 534 {
 535 #ifdef CONFIG_BOOKE
 536         /*
 537          * vrsave (formerly usprg0) isn't used by Linux, but may
 538          * be used by the guest.
 539          *
 540          * On non-booke this is associated with Altivec and
 541          * is handled by code in book3s.c.
 542          */
 543         mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
 544 #endif
 545         kvmppc_core_vcpu_load(vcpu, cpu);
 546 }
 547
 548 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 549 {
 550         kvmppc_core_vcpu_put(vcpu);
 551 #ifdef CONFIG_BOOKE
 552         vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
 553 #endif
 554 }
 555
 556 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 557                                      struct kvm_run *run)
 558 {
 559         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 560 }
 561
 562 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 563                                       struct kvm_run *run)
 564 {
 565         u64 uninitialized_var(gpr);
 566
 567         if (run->mmio.len > sizeof(gpr)) {
 568                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 569                 return;
 570         }
 571
 572         if (vcpu->arch.mmio_is_bigendian) {
 573                 switch (run->mmio.len) {
 574                 case 8: gpr = *(u64 *)run->mmio.data; break;
 575                 case 4: gpr = *(u32 *)run->mmio.data; break;
 576                 case 2: gpr = *(u16 *)run->mmio.data; break;
 577                 case 1: gpr = *(u8 *)run->mmio.data; break;
 578                 }
 579         } else {
 580                 /* Convert BE data from userland back to LE. */
 581                 switch (run->mmio.len) {
 582                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 583                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 584                 case 1: gpr = *(u8 *)run->mmio.data; break;
 585                 }
 586         }
 587
 588         if (vcpu->arch.mmio_sign_extend) {
 589                 switch (run->mmio.len) {
 590 #ifdef CONFIG_PPC64
 591                 case 4:
 592                         gpr = (s64)(s32)gpr;
 593                         break;
 594 #endif
 595                 case 2:
 596                         gpr = (s64)(s16)gpr;
 597                         break;
 598                 case 1:
 599                         gpr = (s64)(s8)gpr;
 600                         break;
 601                 }
 602         }
 603
 604         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 605
 606         switch (vcpu->arch.io_gpr & KVM_MMIO_REG_EXT_MASK) {
 607         case KVM_MMIO_REG_GPR:
 608                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 609                 break;
 610         case KVM_MMIO_REG_FPR:
 611                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 612                 break;
 613 #ifdef CONFIG_PPC_BOOK3S
 614         case KVM_MMIO_REG_QPR:
 615                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 616                 break;
 617         case KVM_MMIO_REG_FQPR:
 618                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 619                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 620                 break;
 621 #endif
 622         default:
 623                 BUG();
 624         }
 625 }
 626
 627 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 628                        unsigned int rt, unsigned int bytes, int is_bigendian)
 629 {
 630         int idx, ret;
 631
 632         if (bytes > sizeof(run->mmio.data)) {
 633                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 634                        run->mmio.len);
 635         }
 636
 637         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 638         run->mmio.len = bytes;
 639         run->mmio.is_write = 0;
 640
 641         vcpu->arch.io_gpr = rt;
 642         vcpu->arch.mmio_is_bigendian = is_bigendian;
 643         vcpu->mmio_needed = 1;
 644         vcpu->mmio_is_write = 0;
 645         vcpu->arch.mmio_sign_extend = 0;
 646
 647         idx = srcu_read_lock(&vcpu->kvm->srcu);
 648
 649         ret = kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
 650                               bytes, &run->mmio.data);
 651
 652         srcu_read_unlock(&vcpu->kvm->srcu, idx);
 653
 654         if (!ret) {
 655                 kvmppc_complete_mmio_load(vcpu, run);
 656                 vcpu->mmio_needed = 0;
 657                 return EMULATE_DONE;
 658         }
 659
 660         return EMULATE_DO_MMIO;
 661 }
 662
 663 /* Same as above, but sign extends */
 664 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 665                         unsigned int rt, unsigned int bytes, int is_bigendian)
 666 {
 667         int r;
 668
 669         vcpu->arch.mmio_sign_extend = 1;
 670         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 671
 672         return r;
 673 }
 674
 675 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 676                         u64 val, unsigned int bytes, int is_bigendian)
 677 {
 678         void *data = run->mmio.data;
 679         int idx, ret;
 680
 681         if (bytes > sizeof(run->mmio.data)) {
 682                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 683                        run->mmio.len);
 684         }
 685
 686         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 687         run->mmio.len = bytes;
 688         run->mmio.is_write = 1;
 689         vcpu->mmio_needed = 1;
 690         vcpu->mmio_is_write = 1;
 691
 692         /* Store the value at the lowest bytes in 'data'. */
 693         if (is_bigendian) {
 694                 switch (bytes) {
 695                 case 8: *(u64 *)data = val; break;
 696                 case 4: *(u32 *)data = val; break;
 697                 case 2: *(u16 *)data = val; break;
 698                 case 1: *(u8  *)data = val; break;
 699                 }
 700         } else {
 701                 /* Store LE value into 'data'. */
 702                 switch (bytes) {
 703                 case 4: st_le32(data, val); break;
 704                 case 2: st_le16(data, val); break;
 705                 case 1: *(u8 *)data = val; break;
 706                 }
 707         }
 708
 709         idx = srcu_read_lock(&vcpu->kvm->srcu);
 710
 711         ret = kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
 712                                bytes, &run->mmio.data);
 713
 714         srcu_read_unlock(&vcpu->kvm->srcu, idx);
 715
 716         if (!ret) {
 717                 vcpu->mmio_needed = 0;
 718                 return EMULATE_DONE;
 719         }
 720
 721         return EMULATE_DO_MMIO;
 722 }
 723
 724 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 725 {
 726         int r;
 727         sigset_t sigsaved;
 728
 729         if (vcpu->sigset_active)
 730                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 731
 732         if (vcpu->mmio_needed) {
 733                 if (!vcpu->mmio_is_write)
 734                         kvmppc_complete_mmio_load(vcpu, run);
 735                 vcpu->mmio_needed = 0;
 736         } else if (vcpu->arch.dcr_needed) {
 737                 if (!vcpu->arch.dcr_is_write)
 738                         kvmppc_complete_dcr_load(vcpu, run);
 739                 vcpu->arch.dcr_needed = 0;
 740         } else if (vcpu->arch.osi_needed) {
 741                 u64 *gprs = run->osi.gprs;
 742                 int i;
 743
 744                 for (i = 0; i < 32; i++)
 745                         kvmppc_set_gpr(vcpu, i, gprs[i]);
 746                 vcpu->arch.osi_needed = 0;
 747         } else if (vcpu->arch.hcall_needed) {
 748                 int i;
 749
 750                 kvmppc_set_gpr(vcpu, 3, run->papr_hcall.ret);
 751                 for (i = 0; i < 9; ++i)
 752                         kvmppc_set_gpr(vcpu, 4 + i, run->papr_hcall.args[i]);
 753                 vcpu->arch.hcall_needed = 0;
 754 #ifdef CONFIG_BOOKE
 755         } else if (vcpu->arch.epr_needed) {
 756                 kvmppc_set_epr(vcpu, run->epr.epr);
 757                 vcpu->arch.epr_needed = 0;
 758 #endif
 759         }
 760
 761         r = kvmppc_vcpu_run(run, vcpu);
 762
 763         if (vcpu->sigset_active)
 764                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 765
 766         return r;
 767 }
 768
 769 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 770 {
 771         if (irq->irq == KVM_INTERRUPT_UNSET) {
 772                 kvmppc_core_dequeue_external(vcpu);
 773                 return 0;
 774         }
 775
 776         kvmppc_core_queue_external(vcpu, irq);
 777
 778         kvm_vcpu_kick(vcpu);
 779
 780         return 0;
 781 }
 782
 783 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 784                                      struct kvm_enable_cap *cap)
 785 {
 786         int r;
 787
 788         if (cap->flags)
 789                 return -EINVAL;
 790
 791         switch (cap->cap) {
 792         case KVM_CAP_PPC_OSI:
 793                 r = 0;
 794                 vcpu->arch.osi_enabled = true;
 795                 break;
 796         case KVM_CAP_PPC_PAPR:
 797                 r = 0;
 798                 vcpu->arch.papr_enabled = true;
 799                 break;
 800         case KVM_CAP_PPC_EPR:
 801                 r = 0;
 802                 if (cap->args[0])
 803                         vcpu->arch.epr_flags |= KVMPPC_EPR_USER;
 804                 else
 805                         vcpu->arch.epr_flags &= ~KVMPPC_EPR_USER;
 806                 break;
 807 #ifdef CONFIG_BOOKE
 808         case KVM_CAP_PPC_BOOKE_WATCHDOG:
 809                 r = 0;
 810                 vcpu->arch.watchdog_enabled = true;
 811                 break;
 812 #endif
 813 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 814         case KVM_CAP_SW_TLB: {
 815                 struct kvm_config_tlb cfg;
 816                 void __user *user_ptr = (void __user *)(uintptr_t)cap->args[0];
 817
 818                 r = -EFAULT;
 819                 if (copy_from_user(&cfg, user_ptr, sizeof(cfg)))
 820                         break;
 821
 822                 r = kvm_vcpu_ioctl_config_tlb(vcpu, &cfg);
 823                 break;
 824         }
 825 #endif
 826 #ifdef CONFIG_KVM_MPIC
 827         case KVM_CAP_IRQ_MPIC: {
 828                 struct file *filp;
 829                 struct kvm_device *dev;
 830
 831                 r = -EBADF;
 832                 filp = fget(cap->args[0]);
 833                 if (!filp)
 834                         break;
 835
 836                 r = -EPERM;
 837                 dev = kvm_device_from_filp(filp);
 838                 if (dev)
 839                         r = kvmppc_mpic_connect_vcpu(dev, vcpu, cap->args[1]);
 840
 841                 fput(filp);
 842                 break;
 843         }
 844 #endif
 845 #ifdef CONFIG_KVM_XICS
 846         case KVM_CAP_IRQ_XICS: {
 847                 struct file *filp;
 848                 struct kvm_device *dev;
 849
 850                 r = -EBADF;
 851                 filp = fget(cap->args[0]);
 852                 if (!filp)
 853                         break;
 854
 855                 r = -EPERM;
 856                 dev = kvm_device_from_filp(filp);
 857                 if (dev)
 858                         r = kvmppc_xics_connect_vcpu(dev, vcpu, cap->args[1]);
 859
 860                 fput(filp);
 861                 break;
 862         }
 863 #endif /* CONFIG_KVM_XICS */
 864         default:
 865                 r = -EINVAL;
 866                 break;
 867         }
 868
 869         if (!r)
 870                 r = kvmppc_sanity_check(vcpu);
 871
 872         return r;
 873 }
 874
 875 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 876                                     struct kvm_mp_state *mp_state)
 877 {
 878         return -EINVAL;
 879 }
 880
 881 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 882                                     struct kvm_mp_state *mp_state)
 883 {
 884         return -EINVAL;
 885 }
 886
 887 long kvm_arch_vcpu_ioctl(struct file *filp,
 888                          unsigned int ioctl, unsigned long arg)
 889 {
 890         struct kvm_vcpu *vcpu = filp->private_data;
 891         void __user *argp = (void __user *)arg;
 892         long r;
 893
 894         switch (ioctl) {
 895         case KVM_INTERRUPT: {
 896                 struct kvm_interrupt irq;
 897                 r = -EFAULT;
 898                 if (copy_from_user(&irq, argp, sizeof(irq)))
 899                         goto out;
 900                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 901                 goto out;
 902         }
 903
 904         case KVM_ENABLE_CAP:
 905         {
 906                 struct kvm_enable_cap cap;
 907                 r = -EFAULT;
 908                 if (copy_from_user(&cap, argp, sizeof(cap)))
 909                         goto out;
 910                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 911                 break;
 912         }
 913
 914         case KVM_SET_ONE_REG:
 915         case KVM_GET_ONE_REG:
 916         {
 917                 struct kvm_one_reg reg;
 918                 r = -EFAULT;
 919                 if (copy_from_user(&reg, argp, sizeof(reg)))
 920                         goto out;
 921                 if (ioctl == KVM_SET_ONE_REG)
 922                         r = kvm_vcpu_ioctl_set_one_reg(vcpu, &reg);
 923                 else
 924                         r = kvm_vcpu_ioctl_get_one_reg(vcpu, &reg);
 925                 break;
 926         }
 927
 928 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 929         case KVM_DIRTY_TLB: {
 930                 struct kvm_dirty_tlb dirty;
 931                 r = -EFAULT;
 932                 if (copy_from_user(&dirty, argp, sizeof(dirty)))
 933                         goto out;
 934                 r = kvm_vcpu_ioctl_dirty_tlb(vcpu, &dirty);
 935                 break;
 936         }
 937 #endif
 938         default:
 939                 r = -EINVAL;
 940         }
 941
 942 out:
 943         return r;
 944 }
 945
 946 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 947 {
 948         return VM_FAULT_SIGBUS;
 949 }
 950
 951 static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
 952 {
 953         u32 inst_nop = 0x60000000;
 954 #ifdef CONFIG_KVM_BOOKE_HV
 955         u32 inst_sc1 = 0x44000022;
 956         pvinfo->hcall[0] = inst_sc1;
 957         pvinfo->hcall[1] = inst_nop;
 958         pvinfo->hcall[2] = inst_nop;
 959         pvinfo->hcall[3] = inst_nop;
 960 #else
 961         u32 inst_lis = 0x3c000000;
 962         u32 inst_ori = 0x60000000;
 963         u32 inst_sc = 0x44000002;
 964         u32 inst_imm_mask = 0xffff;
 965
 966         /*
 967          * The hypercall to get into KVM from within guest context is as
 968          * follows:
 969          *
 970          *    lis r0, r0, KVM_SC_MAGIC_R0@h
 971          *    ori r0, KVM_SC_MAGIC_R0@l
 972          *    sc
 973          *    nop
 974          */
 975         pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
 976         pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask);
 977         pvinfo->hcall[2] = inst_sc;
 978         pvinfo->hcall[3] = inst_nop;
 979 #endif
 980
 981         pvinfo->flags = KVM_PPC_PVINFO_FLAGS_EV_IDLE;
 982
 983         return 0;
 984 }
 985
 986 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event,
 987                           bool line_status)
 988 {
 989         if (!irqchip_in_kernel(kvm))
 990                 return -ENXIO;
 991
 992         irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
 993                                         irq_event->irq, irq_event->level,
 994                                         line_status);
 995         return 0;
 996 }
 997
 998 long kvm_arch_vm_ioctl(struct file *filp,
 999                        unsigned int ioctl, unsigned long arg)
1000 {
1001         struct kvm *kvm __maybe_unused = filp->private_data;
1002         void __user *argp = (void __user *)arg;
1003         long r;
1004
1005         switch (ioctl) {
1006         case KVM_PPC_GET_PVINFO: {
1007                 struct kvm_ppc_pvinfo pvinfo;
1008                 memset(&pvinfo, 0, sizeof(pvinfo));
1009                 r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
1010                 if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
1011                         r = -EFAULT;
1012                         goto out;
1013                 }
1014
1015                 break;
1016         }
1017 #ifdef CONFIG_PPC_BOOK3S_64
1018         case KVM_CREATE_SPAPR_TCE: {
1019                 struct kvm_create_spapr_tce create_tce;
1020
1021                 r = -EFAULT;
1022                 if (copy_from_user(&create_tce, argp, sizeof(create_tce)))
1023                         goto out;
1024                 r = kvm_vm_ioctl_create_spapr_tce(kvm, &create_tce);
1025                 goto out;
1026         }
1027 #endif /* CONFIG_PPC_BOOK3S_64 */
1028
1029 #ifdef CONFIG_KVM_BOOK3S_64_HV
1030         case KVM_ALLOCATE_RMA: {
1031                 struct kvm_allocate_rma rma;
1032                 struct kvm *kvm = filp->private_data;
1033
1034                 r = kvm_vm_ioctl_allocate_rma(kvm, &rma);
1035                 if (r >= 0 && copy_to_user(argp, &rma, sizeof(rma)))
1036                         r = -EFAULT;
1037                 break;
1038         }
1039
1040         case KVM_PPC_ALLOCATE_HTAB: {
1041                 u32 htab_order;
1042
1043                 r = -EFAULT;
1044                 if (get_user(htab_order, (u32 __user *)argp))
1045                         break;
1046                 r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
1047                 if (r)
1048                         break;
1049                 r = -EFAULT;
1050                 if (put_user(htab_order, (u32 __user *)argp))
1051                         break;
1052                 r = 0;
1053                 break;
1054         }
1055
1056         case KVM_PPC_GET_HTAB_FD: {
1057                 struct kvm_get_htab_fd ghf;
1058
1059                 r = -EFAULT;
1060                 if (copy_from_user(&ghf, argp, sizeof(ghf)))
1061                         break;
1062                 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
1063                 break;
1064         }
1065 #endif /* CONFIG_KVM_BOOK3S_64_HV */
1066
1067 #ifdef CONFIG_PPC_BOOK3S_64
1068         case KVM_PPC_GET_SMMU_INFO: {
1069                 struct kvm_ppc_smmu_info info;
1070
1071                 memset(&info, 0, sizeof(info));
1072                 r = kvm_vm_ioctl_get_smmu_info(kvm, &info);
1073                 if (r >= 0 && copy_to_user(argp, &info, sizeof(info)))
1074                         r = -EFAULT;
1075                 break;
1076         }
1077         case KVM_PPC_RTAS_DEFINE_TOKEN: {
1078                 struct kvm *kvm = filp->private_data;
1079
1080                 r = kvm_vm_ioctl_rtas_define_token(kvm, argp);
1081                 break;
1082         }
1083 #endif /* CONFIG_PPC_BOOK3S_64 */
1084         default:
1085                 r = -ENOTTY;
1086         }
1087
1088 out:
1089         return r;
1090 }
1091
1092 static unsigned long lpid_inuse[BITS_TO_LONGS(KVMPPC_NR_LPIDS)];
1093 static unsigned long nr_lpids;
1094
1095 long kvmppc_alloc_lpid(void)
1096 {
1097         long lpid;
1098
1099         do {
1100                 lpid = find_first_zero_bit(lpid_inuse, KVMPPC_NR_LPIDS);
1101                 if (lpid >= nr_lpids) {
1102                         pr_err("%s: No LPIDs free\n", __func__);
1103                         return -ENOMEM;
1104                 }
1105         } while (test_and_set_bit(lpid, lpid_inuse));
1106
1107         return lpid;
1108 }
1109
1110 void kvmppc_claim_lpid(long lpid)
1111 {
1112         set_bit(lpid, lpid_inuse);
1113 }
1114
1115 void kvmppc_free_lpid(long lpid)
1116 {
1117         clear_bit(lpid, lpid_inuse);
1118 }
1119
1120 void kvmppc_init_lpid(unsigned long nr_lpids_param)
1121 {
1122         nr_lpids = min_t(unsigned long, KVMPPC_NR_LPIDS, nr_lpids_param);
1123         memset(lpid_inuse, 0, sizeof(lpid_inuse));
1124 }
1125
1126 int kvm_arch_init(void *opaque)
1127 {
1128         return 0;
1129 }
1130
1131 void kvm_arch_exit(void)
1132 {
1133 }