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                 BUG();
 241         }
 242
 243         return r;
 244 }
 245
 246 int kvm_arch_hardware_enable(void *garbage)
 247 {
 248         return 0;
 249 }
 250
 251 void kvm_arch_hardware_disable(void *garbage)
 252 {
 253 }
 254
 255 int kvm_arch_hardware_setup(void)
 256 {
 257         return 0;
 258 }
 259
 260 void kvm_arch_hardware_unsetup(void)
 261 {
 262 }
 263
 264 void kvm_arch_check_processor_compat(void *rtn)
 265 {
 266         *(int *)rtn = kvmppc_core_check_processor_compat();
 267 }
 268
 269 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 270 {
 271         if (type)
 272                 return -EINVAL;
 273
 274         return kvmppc_core_init_vm(kvm);
 275 }
 276
 277 void kvm_arch_destroy_vm(struct kvm *kvm)
 278 {
 279         unsigned int i;
 280         struct kvm_vcpu *vcpu;
 281
 282         kvm_for_each_vcpu(i, vcpu, kvm)
 283                 kvm_arch_vcpu_free(vcpu);
 284
 285         mutex_lock(&kvm->lock);
 286         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
 287                 kvm->vcpus[i] = NULL;
 288
 289         atomic_set(&kvm->online_vcpus, 0);
 290
 291         kvmppc_core_destroy_vm(kvm);
 292
 293         mutex_unlock(&kvm->lock);
 294 }
 295
 296 void kvm_arch_sync_events(struct kvm *kvm)
 297 {
 298 }
 299
 300 int kvm_dev_ioctl_check_extension(long ext)
 301 {
 302         int r;
 303
 304         switch (ext) {
 305 #ifdef CONFIG_BOOKE
 306         case KVM_CAP_PPC_BOOKE_SREGS:
 307         case KVM_CAP_PPC_BOOKE_WATCHDOG:
 308 #else
 309         case KVM_CAP_PPC_SEGSTATE:
 310         case KVM_CAP_PPC_HIOR:
 311         case KVM_CAP_PPC_PAPR:
 312 #endif
 313         case KVM_CAP_PPC_UNSET_IRQ:
 314         case KVM_CAP_PPC_IRQ_LEVEL:
 315         case KVM_CAP_ENABLE_CAP:
 316         case KVM_CAP_ONE_REG:
 317         case KVM_CAP_IOEVENTFD:
 318                 r = 1;
 319                 break;
 320 #ifndef CONFIG_KVM_BOOK3S_64_HV
 321         case KVM_CAP_PPC_PAIRED_SINGLES:
 322         case KVM_CAP_PPC_OSI:
 323         case KVM_CAP_PPC_GET_PVINFO:
 324 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 325         case KVM_CAP_SW_TLB:
 326 #endif
 327                 r = 1;
 328                 break;
 329         case KVM_CAP_COALESCED_MMIO:
 330                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
 331                 break;
 332 #endif
 333 #ifdef CONFIG_PPC_BOOK3S_64
 334         case KVM_CAP_SPAPR_TCE:
 335         case KVM_CAP_PPC_ALLOC_HTAB:
 336                 r = 1;
 337                 break;
 338 #endif /* CONFIG_PPC_BOOK3S_64 */
 339 #ifdef CONFIG_KVM_BOOK3S_64_HV
 340         case KVM_CAP_PPC_SMT:
 341                 r = threads_per_core;
 342                 break;
 343         case KVM_CAP_PPC_RMA:
 344                 r = 1;
 345                 /* PPC970 requires an RMA */
 346                 if (cpu_has_feature(CPU_FTR_ARCH_201))
 347                         r = 2;
 348                 break;
 349 #endif
 350         case KVM_CAP_SYNC_MMU:
 351 #ifdef CONFIG_KVM_BOOK3S_64_HV
 352                 r = cpu_has_feature(CPU_FTR_ARCH_206) ? 1 : 0;
 353 #elif defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 354                 r = 1;
 355 #else
 356                 r = 0;
 357                 break;
 358 #endif
 359 #ifdef CONFIG_KVM_BOOK3S_64_HV
 360         case KVM_CAP_PPC_HTAB_FD:
 361                 r = 1;
 362                 break;
 363 #endif
 364                 break;
 365         case KVM_CAP_NR_VCPUS:
 366                 /*
 367                  * Recommending a number of CPUs is somewhat arbitrary; we
 368                  * return the number of present CPUs for -HV (since a host
 369                  * will have secondary threads "offline"), and for other KVM
 370                  * implementations just count online CPUs.
 371                  */
 372 #ifdef CONFIG_KVM_BOOK3S_64_HV
 373                 r = num_present_cpus();
 374 #else
 375                 r = num_online_cpus();
 376 #endif
 377                 break;
 378         case KVM_CAP_MAX_VCPUS:
 379                 r = KVM_MAX_VCPUS;
 380                 break;
 381 #ifdef CONFIG_PPC_BOOK3S_64
 382         case KVM_CAP_PPC_GET_SMMU_INFO:
 383                 r = 1;
 384                 break;
 385 #endif
 386         default:
 387                 r = 0;
 388                 break;
 389         }
 390         return r;
 391
 392 }
 393
 394 long kvm_arch_dev_ioctl(struct file *filp,
 395                         unsigned int ioctl, unsigned long arg)
 396 {
 397         return -EINVAL;
 398 }
 399
 400 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 401                            struct kvm_memory_slot *dont)
 402 {
 403         kvmppc_core_free_memslot(free, dont);
 404 }
 405
 406 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
 407 {
 408         return kvmppc_core_create_memslot(slot, npages);
 409 }
 410
 411 int kvm_arch_prepare_memory_region(struct kvm *kvm,
 412                                    struct kvm_memory_slot *memslot,
 413                                    struct kvm_memory_slot old,
 414                                    struct kvm_userspace_memory_region *mem,
 415                                    int user_alloc)
 416 {
 417         return kvmppc_core_prepare_memory_region(kvm, memslot, mem);
 418 }
 419
 420 void kvm_arch_commit_memory_region(struct kvm *kvm,
 421                struct kvm_userspace_memory_region *mem,
 422                struct kvm_memory_slot old,
 423                int user_alloc)
 424 {
 425         kvmppc_core_commit_memory_region(kvm, mem, old);
 426 }
 427
 428 void kvm_arch_flush_shadow_all(struct kvm *kvm)
 429 {
 430 }
 431
 432 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 433                                    struct kvm_memory_slot *slot)
 434 {
 435         kvmppc_core_flush_memslot(kvm, slot);
 436 }
 437
 438 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
 439 {
 440         struct kvm_vcpu *vcpu;
 441         vcpu = kvmppc_core_vcpu_create(kvm, id);
 442         if (!IS_ERR(vcpu)) {
 443                 vcpu->arch.wqp = &vcpu->wq;
 444                 kvmppc_create_vcpu_debugfs(vcpu, id);
 445         }
 446         return vcpu;
 447 }
 448
 449 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 450 {
 451         return 0;
 452 }
 453
 454 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 455 {
 456         /* Make sure we're not using the vcpu anymore */
 457         hrtimer_cancel(&vcpu->arch.dec_timer);
 458         tasklet_kill(&vcpu->arch.tasklet);
 459
 460         kvmppc_remove_vcpu_debugfs(vcpu);
 461         kvmppc_core_vcpu_free(vcpu);
 462 }
 463
 464 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 465 {
 466         kvm_arch_vcpu_free(vcpu);
 467 }
 468
 469 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
 470 {
 471         return kvmppc_core_pending_dec(vcpu);
 472 }
 473
 474 /*
 475  * low level hrtimer wake routine. Because this runs in hardirq context
 476  * we schedule a tasklet to do the real work.
 477  */
 478 enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)
 479 {
 480         struct kvm_vcpu *vcpu;
 481
 482         vcpu = container_of(timer, struct kvm_vcpu, arch.dec_timer);
 483         tasklet_schedule(&vcpu->arch.tasklet);
 484
 485         return HRTIMER_NORESTART;
 486 }
 487
 488 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 489 {
 490         int ret;
 491
 492         hrtimer_init(&vcpu->arch.dec_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
 493         tasklet_init(&vcpu->arch.tasklet, kvmppc_decrementer_func, (ulong)vcpu);
 494         vcpu->arch.dec_timer.function = kvmppc_decrementer_wakeup;
 495         vcpu->arch.dec_expires = ~(u64)0;
 496
 497 #ifdef CONFIG_KVM_EXIT_TIMING
 498         mutex_init(&vcpu->arch.exit_timing_lock);
 499 #endif
 500         ret = kvmppc_subarch_vcpu_init(vcpu);
 501         return ret;
 502 }
 503
 504 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
 505 {
 506         kvmppc_mmu_destroy(vcpu);
 507         kvmppc_subarch_vcpu_uninit(vcpu);
 508 }
 509
 510 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 511 {
 512 #ifdef CONFIG_BOOKE
 513         /*
 514          * vrsave (formerly usprg0) isn't used by Linux, but may
 515          * be used by the guest.
 516          *
 517          * On non-booke this is associated with Altivec and
 518          * is handled by code in book3s.c.
 519          */
 520         mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
 521 #endif
 522         kvmppc_core_vcpu_load(vcpu, cpu);
 523 }
 524
 525 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 526 {
 527         kvmppc_core_vcpu_put(vcpu);
 528 #ifdef CONFIG_BOOKE
 529         vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
 530 #endif
 531 }
 532
 533 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 534                                         struct kvm_guest_debug *dbg)
 535 {
 536         return -EINVAL;
 537 }
 538
 539 static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
 540                                      struct kvm_run *run)
 541 {
 542         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, run->dcr.data);
 543 }
 544
 545 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
 546                                       struct kvm_run *run)
 547 {
 548         u64 uninitialized_var(gpr);
 549
 550         if (run->mmio.len > sizeof(gpr)) {
 551                 printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
 552                 return;
 553         }
 554
 555         if (vcpu->arch.mmio_is_bigendian) {
 556                 switch (run->mmio.len) {
 557                 case 8: gpr = *(u64 *)run->mmio.data; break;
 558                 case 4: gpr = *(u32 *)run->mmio.data; break;
 559                 case 2: gpr = *(u16 *)run->mmio.data; break;
 560                 case 1: gpr = *(u8 *)run->mmio.data; break;
 561                 }
 562         } else {
 563                 /* Convert BE data from userland back to LE. */
 564                 switch (run->mmio.len) {
 565                 case 4: gpr = ld_le32((u32 *)run->mmio.data); break;
 566                 case 2: gpr = ld_le16((u16 *)run->mmio.data); break;
 567                 case 1: gpr = *(u8 *)run->mmio.data; break;
 568                 }
 569         }
 570
 571         if (vcpu->arch.mmio_sign_extend) {
 572                 switch (run->mmio.len) {
 573 #ifdef CONFIG_PPC64
 574                 case 4:
 575                         gpr = (s64)(s32)gpr;
 576                         break;
 577 #endif
 578                 case 2:
 579                         gpr = (s64)(s16)gpr;
 580                         break;
 581                 case 1:
 582                         gpr = (s64)(s8)gpr;
 583                         break;
 584                 }
 585         }
 586
 587         kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 588
 589         switch (vcpu->arch.io_gpr & KVM_MMIO_REG_EXT_MASK) {
 590         case KVM_MMIO_REG_GPR:
 591                 kvmppc_set_gpr(vcpu, vcpu->arch.io_gpr, gpr);
 592                 break;
 593         case KVM_MMIO_REG_FPR:
 594                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 595                 break;
 596 #ifdef CONFIG_PPC_BOOK3S
 597         case KVM_MMIO_REG_QPR:
 598                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 599                 break;
 600         case KVM_MMIO_REG_FQPR:
 601                 vcpu->arch.fpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 602                 vcpu->arch.qpr[vcpu->arch.io_gpr & KVM_MMIO_REG_MASK] = gpr;
 603                 break;
 604 #endif
 605         default:
 606                 BUG();
 607         }
 608 }
 609
 610 int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
 611                        unsigned int rt, unsigned int bytes, int is_bigendian)
 612 {
 613         if (bytes > sizeof(run->mmio.data)) {
 614                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 615                        run->mmio.len);
 616         }
 617
 618         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 619         run->mmio.len = bytes;
 620         run->mmio.is_write = 0;
 621
 622         vcpu->arch.io_gpr = rt;
 623         vcpu->arch.mmio_is_bigendian = is_bigendian;
 624         vcpu->mmio_needed = 1;
 625         vcpu->mmio_is_write = 0;
 626         vcpu->arch.mmio_sign_extend = 0;
 627
 628         if (!kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
 629                              bytes, &run->mmio.data)) {
 630                 kvmppc_complete_mmio_load(vcpu, run);
 631                 vcpu->mmio_needed = 0;
 632                 return EMULATE_DONE;
 633         }
 634
 635         return EMULATE_DO_MMIO;
 636 }
 637
 638 /* Same as above, but sign extends */
 639 int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
 640                         unsigned int rt, unsigned int bytes, int is_bigendian)
 641 {
 642         int r;
 643
 644         vcpu->arch.mmio_sign_extend = 1;
 645         r = kvmppc_handle_load(run, vcpu, rt, bytes, is_bigendian);
 646
 647         return r;
 648 }
 649
 650 int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
 651                         u64 val, unsigned int bytes, int is_bigendian)
 652 {
 653         void *data = run->mmio.data;
 654
 655         if (bytes > sizeof(run->mmio.data)) {
 656                 printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
 657                        run->mmio.len);
 658         }
 659
 660         run->mmio.phys_addr = vcpu->arch.paddr_accessed;
 661         run->mmio.len = bytes;
 662         run->mmio.is_write = 1;
 663         vcpu->mmio_needed = 1;
 664         vcpu->mmio_is_write = 1;
 665
 666         /* Store the value at the lowest bytes in 'data'. */
 667         if (is_bigendian) {
 668                 switch (bytes) {
 669                 case 8: *(u64 *)data = val; break;
 670                 case 4: *(u32 *)data = val; break;
 671                 case 2: *(u16 *)data = val; break;
 672                 case 1: *(u8  *)data = val; break;
 673                 }
 674         } else {
 675                 /* Store LE value into 'data'. */
 676                 switch (bytes) {
 677                 case 4: st_le32(data, val); break;
 678                 case 2: st_le16(data, val); break;
 679                 case 1: *(u8 *)data = val; break;
 680                 }
 681         }
 682
 683         if (!kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, run->mmio.phys_addr,
 684                               bytes, &run->mmio.data)) {
 685                 kvmppc_complete_mmio_load(vcpu, run);
 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         }
 724
 725         r = kvmppc_vcpu_run(run, vcpu);
 726
 727         if (vcpu->sigset_active)
 728                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
 729
 730         return r;
 731 }
 732
 733 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 734 {
 735         if (irq->irq == KVM_INTERRUPT_UNSET) {
 736                 kvmppc_core_dequeue_external(vcpu, irq);
 737                 return 0;
 738         }
 739
 740         kvmppc_core_queue_external(vcpu, irq);
 741
 742         kvm_vcpu_kick(vcpu);
 743
 744         return 0;
 745 }
 746
 747 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
 748                                      struct kvm_enable_cap *cap)
 749 {
 750         int r;
 751
 752         if (cap->flags)
 753                 return -EINVAL;
 754
 755         switch (cap->cap) {
 756         case KVM_CAP_PPC_OSI:
 757                 r = 0;
 758                 vcpu->arch.osi_enabled = true;
 759                 break;
 760         case KVM_CAP_PPC_PAPR:
 761                 r = 0;
 762                 vcpu->arch.papr_enabled = true;
 763                 break;
 764 #ifdef CONFIG_BOOKE
 765         case KVM_CAP_PPC_BOOKE_WATCHDOG:
 766                 r = 0;
 767                 vcpu->arch.watchdog_enabled = true;
 768                 break;
 769 #endif
 770 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 771         case KVM_CAP_SW_TLB: {
 772                 struct kvm_config_tlb cfg;
 773                 void __user *user_ptr = (void __user *)(uintptr_t)cap->args[0];
 774
 775                 r = -EFAULT;
 776                 if (copy_from_user(&cfg, user_ptr, sizeof(cfg)))
 777                         break;
 778
 779                 r = kvm_vcpu_ioctl_config_tlb(vcpu, &cfg);
 780                 break;
 781         }
 782 #endif
 783         default:
 784                 r = -EINVAL;
 785                 break;
 786         }
 787
 788         if (!r)
 789                 r = kvmppc_sanity_check(vcpu);
 790
 791         return r;
 792 }
 793
 794 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 795                                     struct kvm_mp_state *mp_state)
 796 {
 797         return -EINVAL;
 798 }
 799
 800 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 801                                     struct kvm_mp_state *mp_state)
 802 {
 803         return -EINVAL;
 804 }
 805
 806 long kvm_arch_vcpu_ioctl(struct file *filp,
 807                          unsigned int ioctl, unsigned long arg)
 808 {
 809         struct kvm_vcpu *vcpu = filp->private_data;
 810         void __user *argp = (void __user *)arg;
 811         long r;
 812
 813         switch (ioctl) {
 814         case KVM_INTERRUPT: {
 815                 struct kvm_interrupt irq;
 816                 r = -EFAULT;
 817                 if (copy_from_user(&irq, argp, sizeof(irq)))
 818                         goto out;
 819                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 820                 goto out;
 821         }
 822
 823         case KVM_ENABLE_CAP:
 824         {
 825                 struct kvm_enable_cap cap;
 826                 r = -EFAULT;
 827                 if (copy_from_user(&cap, argp, sizeof(cap)))
 828                         goto out;
 829                 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
 830                 break;
 831         }
 832
 833         case KVM_SET_ONE_REG:
 834         case KVM_GET_ONE_REG:
 835         {
 836                 struct kvm_one_reg reg;
 837                 r = -EFAULT;
 838                 if (copy_from_user(&reg, argp, sizeof(reg)))
 839                         goto out;
 840                 if (ioctl == KVM_SET_ONE_REG)
 841                         r = kvm_vcpu_ioctl_set_one_reg(vcpu, &reg);
 842                 else
 843                         r = kvm_vcpu_ioctl_get_one_reg(vcpu, &reg);
 844                 break;
 845         }
 846
 847 #if defined(CONFIG_KVM_E500V2) || defined(CONFIG_KVM_E500MC)
 848         case KVM_DIRTY_TLB: {
 849                 struct kvm_dirty_tlb dirty;
 850                 r = -EFAULT;
 851                 if (copy_from_user(&dirty, argp, sizeof(dirty)))
 852                         goto out;
 853                 r = kvm_vcpu_ioctl_dirty_tlb(vcpu, &dirty);
 854                 break;
 855         }
 856 #endif
 857         default:
 858                 r = -EINVAL;
 859         }
 860
 861 out:
 862         return r;
 863 }
 864
 865 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 866 {
 867         return VM_FAULT_SIGBUS;
 868 }
 869
 870 static int kvm_vm_ioctl_get_pvinfo(struct kvm_ppc_pvinfo *pvinfo)
 871 {
 872         u32 inst_nop = 0x60000000;
 873 #ifdef CONFIG_KVM_BOOKE_HV
 874         u32 inst_sc1 = 0x44000022;
 875         pvinfo->hcall[0] = inst_sc1;
 876         pvinfo->hcall[1] = inst_nop;
 877         pvinfo->hcall[2] = inst_nop;
 878         pvinfo->hcall[3] = inst_nop;
 879 #else
 880         u32 inst_lis = 0x3c000000;
 881         u32 inst_ori = 0x60000000;
 882         u32 inst_sc = 0x44000002;
 883         u32 inst_imm_mask = 0xffff;
 884
 885         /*
 886          * The hypercall to get into KVM from within guest context is as
 887          * follows:
 888          *
 889          *    lis r0, r0, KVM_SC_MAGIC_R0@h
 890          *    ori r0, KVM_SC_MAGIC_R0@l
 891          *    sc
 892          *    nop
 893          */
 894         pvinfo->hcall[0] = inst_lis | ((KVM_SC_MAGIC_R0 >> 16) & inst_imm_mask);
 895         pvinfo->hcall[1] = inst_ori | (KVM_SC_MAGIC_R0 & inst_imm_mask);
 896         pvinfo->hcall[2] = inst_sc;
 897         pvinfo->hcall[3] = inst_nop;
 898 #endif
 899
 900         pvinfo->flags = KVM_PPC_PVINFO_FLAGS_EV_IDLE;
 901
 902         return 0;
 903 }
 904
 905 long kvm_arch_vm_ioctl(struct file *filp,
 906                        unsigned int ioctl, unsigned long arg)
 907 {
 908         void __user *argp = (void __user *)arg;
 909         long r;
 910
 911         switch (ioctl) {
 912         case KVM_PPC_GET_PVINFO: {
 913                 struct kvm_ppc_pvinfo pvinfo;
 914                 memset(&pvinfo, 0, sizeof(pvinfo));
 915                 r = kvm_vm_ioctl_get_pvinfo(&pvinfo);
 916                 if (copy_to_user(argp, &pvinfo, sizeof(pvinfo))) {
 917                         r = -EFAULT;
 918                         goto out;
 919                 }
 920
 921                 break;
 922         }
 923 #ifdef CONFIG_PPC_BOOK3S_64
 924         case KVM_CREATE_SPAPR_TCE: {
 925                 struct kvm_create_spapr_tce create_tce;
 926                 struct kvm *kvm = filp->private_data;
 927
 928                 r = -EFAULT;
 929                 if (copy_from_user(&create_tce, argp, sizeof(create_tce)))
 930                         goto out;
 931                 r = kvm_vm_ioctl_create_spapr_tce(kvm, &create_tce);
 932                 goto out;
 933         }
 934 #endif /* CONFIG_PPC_BOOK3S_64 */
 935
 936 #ifdef CONFIG_KVM_BOOK3S_64_HV
 937         case KVM_ALLOCATE_RMA: {
 938                 struct kvm *kvm = filp->private_data;
 939                 struct kvm_allocate_rma rma;
 940
 941                 r = kvm_vm_ioctl_allocate_rma(kvm, &rma);
 942                 if (r >= 0 && copy_to_user(argp, &rma, sizeof(rma)))
 943                         r = -EFAULT;
 944                 break;
 945         }
 946
 947         case KVM_PPC_ALLOCATE_HTAB: {
 948                 struct kvm *kvm = filp->private_data;
 949                 u32 htab_order;
 950
 951                 r = -EFAULT;
 952                 if (get_user(htab_order, (u32 __user *)argp))
 953                         break;
 954                 r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
 955                 if (r)
 956                         break;
 957                 r = -EFAULT;
 958                 if (put_user(htab_order, (u32 __user *)argp))
 959                         break;
 960                 r = 0;
 961                 break;
 962         }
 963
 964         case KVM_PPC_GET_HTAB_FD: {
 965                 struct kvm *kvm = filp->private_data;
 966                 struct kvm_get_htab_fd ghf;
 967
 968                 r = -EFAULT;
 969                 if (copy_from_user(&ghf, argp, sizeof(ghf)))
 970                         break;
 971                 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
 972                 break;
 973         }
 974 #endif /* CONFIG_KVM_BOOK3S_64_HV */
 975
 976 #ifdef CONFIG_PPC_BOOK3S_64
 977         case KVM_PPC_GET_SMMU_INFO: {
 978                 struct kvm *kvm = filp->private_data;
 979                 struct kvm_ppc_smmu_info info;
 980
 981                 memset(&info, 0, sizeof(info));
 982                 r = kvm_vm_ioctl_get_smmu_info(kvm, &info);
 983                 if (r >= 0 && copy_to_user(argp, &info, sizeof(info)))
 984                         r = -EFAULT;
 985                 break;
 986         }
 987 #endif /* CONFIG_PPC_BOOK3S_64 */
 988         default:
 989                 r = -ENOTTY;
 990         }
 991
 992 out:
 993         return r;
 994 }
 995
 996 static unsigned long lpid_inuse[BITS_TO_LONGS(KVMPPC_NR_LPIDS)];
 997 static unsigned long nr_lpids;
 998
 999 long kvmppc_alloc_lpid(void)
1000 {
1001         long lpid;
1002
1003         do {
1004                 lpid = find_first_zero_bit(lpid_inuse, KVMPPC_NR_LPIDS);
1005                 if (lpid >= nr_lpids) {
1006                         pr_err("%s: No LPIDs free\n", __func__);
1007                         return -ENOMEM;
1008                 }
1009         } while (test_and_set_bit(lpid, lpid_inuse));
1010
1011         return lpid;
1012 }
1013
1014 void kvmppc_claim_lpid(long lpid)
1015 {
1016         set_bit(lpid, lpid_inuse);
1017 }
1018
1019 void kvmppc_free_lpid(long lpid)
1020 {
1021         clear_bit(lpid, lpid_inuse);
1022 }
1023
1024 void kvmppc_init_lpid(unsigned long nr_lpids_param)
1025 {
1026         nr_lpids = min_t(unsigned long, KVMPPC_NR_LPIDS, nr_lpids_param);
1027         memset(lpid_inuse, 0, sizeof(lpid_inuse));
1028 }
1029
1030 int kvm_arch_init(void *opaque)
1031 {
1032         return 0;
1033 }
1034
1035 void kvm_arch_exit(void)
1036 {
1037 }