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