target/arm/kvm.c

   1 /*
   2  * ARM implementation of KVM hooks
   3  *
   4  * Copyright Christoffer Dall 2009-2010
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  *
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include <sys/ioctl.h>
  13
  14 #include <linux/kvm.h>
  15
  16 #include "qemu-common.h"
  17 #include "qemu/timer.h"
  18 #include "qemu/error-report.h"
  19 #include "qemu/main-loop.h"
  20 #include "qom/object.h"
  21 #include "qapi/error.h"
  22 #include "sysemu/sysemu.h"
  23 #include "sysemu/kvm.h"
  24 #include "sysemu/kvm_int.h"
  25 #include "kvm_arm.h"
  26 #include "cpu.h"
  27 #include "trace.h"
  28 #include "internals.h"
  29 #include "hw/pci/pci.h"
  30 #include "exec/memattrs.h"
  31 #include "exec/address-spaces.h"
  32 #include "hw/boards.h"
  33 #include "hw/irq.h"
  34 #include "qemu/log.h"
  35
  36 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  37     KVM_CAP_LAST_INFO
  38 };
  39
  40 static bool cap_has_mp_state;
  41 static bool cap_has_inject_serror_esr;
  42 static bool cap_has_inject_ext_dabt;
  43
  44 static ARMHostCPUFeatures arm_host_cpu_features;
  45
  46 int kvm_arm_vcpu_init(CPUState *cs)
  47 {
  48     ARMCPU *cpu = ARM_CPU(cs);
  49     struct kvm_vcpu_init init;
  50
  51     init.target = cpu->kvm_target;
  52     memcpy(init.features, cpu->kvm_init_features, sizeof(init.features));
  53
  54     return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init);
  55 }
  56
  57 int kvm_arm_vcpu_finalize(CPUState *cs, int feature)
  58 {
  59     return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_FINALIZE, &feature);
  60 }
  61
  62 void kvm_arm_init_serror_injection(CPUState *cs)
  63 {
  64     cap_has_inject_serror_esr = kvm_check_extension(cs->kvm_state,
  65                                     KVM_CAP_ARM_INJECT_SERROR_ESR);
  66 }
  67
  68 bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
  69                                       int *fdarray,
  70                                       struct kvm_vcpu_init *init)
  71 {
  72     int ret = 0, kvmfd = -1, vmfd = -1, cpufd = -1;
  73
  74     kvmfd = qemu_open_old("/dev/kvm", O_RDWR);
  75     if (kvmfd < 0) {
  76         goto err;
  77     }
  78     vmfd = ioctl(kvmfd, KVM_CREATE_VM, 0);
  79     if (vmfd < 0) {
  80         goto err;
  81     }
  82     cpufd = ioctl(vmfd, KVM_CREATE_VCPU, 0);
  83     if (cpufd < 0) {
  84         goto err;
  85     }
  86
  87     if (!init) {
  88         /* Caller doesn't want the VCPU to be initialized, so skip it */
  89         goto finish;
  90     }
  91
  92     if (init->target == -1) {
  93         struct kvm_vcpu_init preferred;
  94
  95         ret = ioctl(vmfd, KVM_ARM_PREFERRED_TARGET, &preferred);
  96         if (!ret) {
  97             init->target = preferred.target;
  98         }
  99     }
 100     if (ret >= 0) {
 101         ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, init);
 102         if (ret < 0) {
 103             goto err;
 104         }
 105     } else if (cpus_to_try) {
 106         /* Old kernel which doesn't know about the
 107          * PREFERRED_TARGET ioctl: we know it will only support
 108          * creating one kind of guest CPU which is its preferred
 109          * CPU type.
 110          */
 111         struct kvm_vcpu_init try;
 112
 113         while (*cpus_to_try != QEMU_KVM_ARM_TARGET_NONE) {
 114             try.target = *cpus_to_try++;
 115             memcpy(try.features, init->features, sizeof(init->features));
 116             ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, &try);
 117             if (ret >= 0) {
 118                 break;
 119             }
 120         }
 121         if (ret < 0) {
 122             goto err;
 123         }
 124         init->target = try.target;
 125     } else {
 126         /* Treat a NULL cpus_to_try argument the same as an empty
 127          * list, which means we will fail the call since this must
 128          * be an old kernel which doesn't support PREFERRED_TARGET.
 129          */
 130         goto err;
 131     }
 132
 133 finish:
 134     fdarray[0] = kvmfd;
 135     fdarray[1] = vmfd;
 136     fdarray[2] = cpufd;
 137
 138     return true;
 139
 140 err:
 141     if (cpufd >= 0) {
 142         close(cpufd);
 143     }
 144     if (vmfd >= 0) {
 145         close(vmfd);
 146     }
 147     if (kvmfd >= 0) {
 148         close(kvmfd);
 149     }
 150
 151     return false;
 152 }
 153
 154 void kvm_arm_destroy_scratch_host_vcpu(int *fdarray)
 155 {
 156     int i;
 157
 158     for (i = 2; i >= 0; i--) {
 159         close(fdarray[i]);
 160     }
 161 }
 162
 163 void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
 164 {
 165     CPUARMState *env = &cpu->env;
 166
 167     if (!arm_host_cpu_features.dtb_compatible) {
 168         if (!kvm_enabled() ||
 169             !kvm_arm_get_host_cpu_features(&arm_host_cpu_features)) {
 170             /* We can't report this error yet, so flag that we need to
 171              * in arm_cpu_realizefn().
 172              */
 173             cpu->kvm_target = QEMU_KVM_ARM_TARGET_NONE;
 174             cpu->host_cpu_probe_failed = true;
 175             return;
 176         }
 177     }
 178
 179     cpu->kvm_target = arm_host_cpu_features.target;
 180     cpu->dtb_compatible = arm_host_cpu_features.dtb_compatible;
 181     cpu->isar = arm_host_cpu_features.isar;
 182     env->features = arm_host_cpu_features.features;
 183 }
 184
 185 static bool kvm_no_adjvtime_get(Object *obj, Error **errp)
 186 {
 187     return !ARM_CPU(obj)->kvm_adjvtime;
 188 }
 189
 190 static void kvm_no_adjvtime_set(Object *obj, bool value, Error **errp)
 191 {
 192     ARM_CPU(obj)->kvm_adjvtime = !value;
 193 }
 194
 195 static bool kvm_steal_time_get(Object *obj, Error **errp)
 196 {
 197     return ARM_CPU(obj)->kvm_steal_time != ON_OFF_AUTO_OFF;
 198 }
 199
 200 static void kvm_steal_time_set(Object *obj, bool value, Error **errp)
 201 {
 202     ARM_CPU(obj)->kvm_steal_time = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
 203 }
 204
 205 /* KVM VCPU properties should be prefixed with "kvm-". */
 206 void kvm_arm_add_vcpu_properties(Object *obj)
 207 {
 208     ARMCPU *cpu = ARM_CPU(obj);
 209     CPUARMState *env = &cpu->env;
 210
 211     if (arm_feature(env, ARM_FEATURE_GENERIC_TIMER)) {
 212         cpu->kvm_adjvtime = true;
 213         object_property_add_bool(obj, "kvm-no-adjvtime", kvm_no_adjvtime_get,
 214                                  kvm_no_adjvtime_set);
 215         object_property_set_description(obj, "kvm-no-adjvtime",
 216                                         "Set on to disable the adjustment of "
 217                                         "the virtual counter. VM stopped time "
 218                                         "will be counted.");
 219     }
 220
 221     cpu->kvm_steal_time = ON_OFF_AUTO_AUTO;
 222     object_property_add_bool(obj, "kvm-steal-time", kvm_steal_time_get,
 223                              kvm_steal_time_set);
 224     object_property_set_description(obj, "kvm-steal-time",
 225                                     "Set off to disable KVM steal time.");
 226 }
 227
 228 bool kvm_arm_pmu_supported(void)
 229 {
 230     return kvm_check_extension(kvm_state, KVM_CAP_ARM_PMU_V3);
 231 }
 232
 233 int kvm_arm_get_max_vm_ipa_size(MachineState *ms)
 234 {
 235     KVMState *s = KVM_STATE(ms->accelerator);
 236     int ret;
 237
 238     ret = kvm_check_extension(s, KVM_CAP_ARM_VM_IPA_SIZE);
 239     return ret > 0 ? ret : 40;
 240 }
 241
 242 int kvm_arch_init(MachineState *ms, KVMState *s)
 243 {
 244     int ret = 0;
 245     /* For ARM interrupt delivery is always asynchronous,
 246      * whether we are using an in-kernel VGIC or not.
 247      */
 248     kvm_async_interrupts_allowed = true;
 249
 250     /*
 251      * PSCI wakes up secondary cores, so we always need to
 252      * have vCPUs waiting in kernel space
 253      */
 254     kvm_halt_in_kernel_allowed = true;
 255
 256     cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
 257
 258     if (ms->smp.cpus > 256 &&
 259         !kvm_check_extension(s, KVM_CAP_ARM_IRQ_LINE_LAYOUT_2)) {
 260         error_report("Using more than 256 vcpus requires a host kernel "
 261                      "with KVM_CAP_ARM_IRQ_LINE_LAYOUT_2");
 262         ret = -EINVAL;
 263     }
 264
 265     if (kvm_check_extension(s, KVM_CAP_ARM_NISV_TO_USER)) {
 266         if (kvm_vm_enable_cap(s, KVM_CAP_ARM_NISV_TO_USER, 0)) {
 267             error_report("Failed to enable KVM_CAP_ARM_NISV_TO_USER cap");
 268         } else {
 269             /* Set status for supporting the external dabt injection */
 270             cap_has_inject_ext_dabt = kvm_check_extension(s,
 271                                     KVM_CAP_ARM_INJECT_EXT_DABT);
 272         }
 273     }
 274
 275     return ret;
 276 }
 277
 278 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 279 {
 280     return cpu->cpu_index;
 281 }
 282
 283 /* We track all the KVM devices which need their memory addresses
 284  * passing to the kernel in a list of these structures.
 285  * When board init is complete we run through the list and
 286  * tell the kernel the base addresses of the memory regions.
 287  * We use a MemoryListener to track mapping and unmapping of
 288  * the regions during board creation, so the board models don't
 289  * need to do anything special for the KVM case.
 290  *
 291  * Sometimes the address must be OR'ed with some other fields
 292  * (for example for KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION).
 293  * @kda_addr_ormask aims at storing the value of those fields.
 294  */
 295 typedef struct KVMDevice {
 296     struct kvm_arm_device_addr kda;
 297     struct kvm_device_attr kdattr;
 298     uint64_t kda_addr_ormask;
 299     MemoryRegion *mr;
 300     QSLIST_ENTRY(KVMDevice) entries;
 301     int dev_fd;
 302 } KVMDevice;
 303
 304 static QSLIST_HEAD(, KVMDevice) kvm_devices_head;
 305
 306 static void kvm_arm_devlistener_add(MemoryListener *listener,
 307                                     MemoryRegionSection *section)
 308 {
 309     KVMDevice *kd;
 310
 311     QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
 312         if (section->mr == kd->mr) {
 313             kd->kda.addr = section->offset_within_address_space;
 314         }
 315     }
 316 }
 317
 318 static void kvm_arm_devlistener_del(MemoryListener *listener,
 319                                     MemoryRegionSection *section)
 320 {
 321     KVMDevice *kd;
 322
 323     QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
 324         if (section->mr == kd->mr) {
 325             kd->kda.addr = -1;
 326         }
 327     }
 328 }
 329
 330 static MemoryListener devlistener = {
 331     .region_add = kvm_arm_devlistener_add,
 332     .region_del = kvm_arm_devlistener_del,
 333 };
 334
 335 static void kvm_arm_set_device_addr(KVMDevice *kd)
 336 {
 337     struct kvm_device_attr *attr = &kd->kdattr;
 338     int ret;
 339
 340     /* If the device control API is available and we have a device fd on the
 341      * KVMDevice struct, let's use the newer API
 342      */
 343     if (kd->dev_fd >= 0) {
 344         uint64_t addr = kd->kda.addr;
 345
 346         addr |= kd->kda_addr_ormask;
 347         attr->addr = (uintptr_t)&addr;
 348         ret = kvm_device_ioctl(kd->dev_fd, KVM_SET_DEVICE_ATTR, attr);
 349     } else {
 350         ret = kvm_vm_ioctl(kvm_state, KVM_ARM_SET_DEVICE_ADDR, &kd->kda);
 351     }
 352
 353     if (ret < 0) {
 354         fprintf(stderr, "Failed to set device address: %s\n",
 355                 strerror(-ret));
 356         abort();
 357     }
 358 }
 359
 360 static void kvm_arm_machine_init_done(Notifier *notifier, void *data)
 361 {
 362     KVMDevice *kd, *tkd;
 363
 364     QSLIST_FOREACH_SAFE(kd, &kvm_devices_head, entries, tkd) {
 365         if (kd->kda.addr != -1) {
 366             kvm_arm_set_device_addr(kd);
 367         }
 368         memory_region_unref(kd->mr);
 369         QSLIST_REMOVE_HEAD(&kvm_devices_head, entries);
 370         g_free(kd);
 371     }
 372     memory_listener_unregister(&devlistener);
 373 }
 374
 375 static Notifier notify = {
 376     .notify = kvm_arm_machine_init_done,
 377 };
 378
 379 void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
 380                              uint64_t attr, int dev_fd, uint64_t addr_ormask)
 381 {
 382     KVMDevice *kd;
 383
 384     if (!kvm_irqchip_in_kernel()) {
 385         return;
 386     }
 387
 388     if (QSLIST_EMPTY(&kvm_devices_head)) {
 389         memory_listener_register(&devlistener, &address_space_memory);
 390         qemu_add_machine_init_done_notifier(&notify);
 391     }
 392     kd = g_new0(KVMDevice, 1);
 393     kd->mr = mr;
 394     kd->kda.id = devid;
 395     kd->kda.addr = -1;
 396     kd->kdattr.flags = 0;
 397     kd->kdattr.group = group;
 398     kd->kdattr.attr = attr;
 399     kd->dev_fd = dev_fd;
 400     kd->kda_addr_ormask = addr_ormask;
 401     QSLIST_INSERT_HEAD(&kvm_devices_head, kd, entries);
 402     memory_region_ref(kd->mr);
 403 }
 404
 405 static int compare_u64(const void *a, const void *b)
 406 {
 407     if (*(uint64_t *)a > *(uint64_t *)b) {
 408         return 1;
 409     }
 410     if (*(uint64_t *)a < *(uint64_t *)b) {
 411         return -1;
 412     }
 413     return 0;
 414 }
 415
 416 /*
 417  * cpreg_values are sorted in ascending order by KVM register ID
 418  * (see kvm_arm_init_cpreg_list). This allows us to cheaply find
 419  * the storage for a KVM register by ID with a binary search.
 420  */
 421 static uint64_t *kvm_arm_get_cpreg_ptr(ARMCPU *cpu, uint64_t regidx)
 422 {
 423     uint64_t *res;
 424
 425     res = bsearch(&regidx, cpu->cpreg_indexes, cpu->cpreg_array_len,
 426                   sizeof(uint64_t), compare_u64);
 427     assert(res);
 428
 429     return &cpu->cpreg_values[res - cpu->cpreg_indexes];
 430 }
 431
 432 /* Initialize the ARMCPU cpreg list according to the kernel's
 433  * definition of what CPU registers it knows about (and throw away
 434  * the previous TCG-created cpreg list).
 435  */
 436 int kvm_arm_init_cpreg_list(ARMCPU *cpu)
 437 {
 438     struct kvm_reg_list rl;
 439     struct kvm_reg_list *rlp;
 440     int i, ret, arraylen;
 441     CPUState *cs = CPU(cpu);
 442
 443     rl.n = 0;
 444     ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, &rl);
 445     if (ret != -E2BIG) {
 446         return ret;
 447     }
 448     rlp = g_malloc(sizeof(struct kvm_reg_list) + rl.n * sizeof(uint64_t));
 449     rlp->n = rl.n;
 450     ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, rlp);
 451     if (ret) {
 452         goto out;
 453     }
 454     /* Sort the list we get back from the kernel, since cpreg_tuples
 455      * must be in strictly ascending order.
 456      */
 457     qsort(&rlp->reg, rlp->n, sizeof(rlp->reg[0]), compare_u64);
 458
 459     for (i = 0, arraylen = 0; i < rlp->n; i++) {
 460         if (!kvm_arm_reg_syncs_via_cpreg_list(rlp->reg[i])) {
 461             continue;
 462         }
 463         switch (rlp->reg[i] & KVM_REG_SIZE_MASK) {
 464         case KVM_REG_SIZE_U32:
 465         case KVM_REG_SIZE_U64:
 466             break;
 467         default:
 468             fprintf(stderr, "Can't handle size of register in kernel list\n");
 469             ret = -EINVAL;
 470             goto out;
 471         }
 472
 473         arraylen++;
 474     }
 475
 476     cpu->cpreg_indexes = g_renew(uint64_t, cpu->cpreg_indexes, arraylen);
 477     cpu->cpreg_values = g_renew(uint64_t, cpu->cpreg_values, arraylen);
 478     cpu->cpreg_vmstate_indexes = g_renew(uint64_t, cpu->cpreg_vmstate_indexes,
 479                                          arraylen);
 480     cpu->cpreg_vmstate_values = g_renew(uint64_t, cpu->cpreg_vmstate_values,
 481                                         arraylen);
 482     cpu->cpreg_array_len = arraylen;
 483     cpu->cpreg_vmstate_array_len = arraylen;
 484
 485     for (i = 0, arraylen = 0; i < rlp->n; i++) {
 486         uint64_t regidx = rlp->reg[i];
 487         if (!kvm_arm_reg_syncs_via_cpreg_list(regidx)) {
 488             continue;
 489         }
 490         cpu->cpreg_indexes[arraylen] = regidx;
 491         arraylen++;
 492     }
 493     assert(cpu->cpreg_array_len == arraylen);
 494
 495     if (!write_kvmstate_to_list(cpu)) {
 496         /* Shouldn't happen unless kernel is inconsistent about
 497          * what registers exist.
 498          */
 499         fprintf(stderr, "Initial read of kernel register state failed\n");
 500         ret = -EINVAL;
 501         goto out;
 502     }
 503
 504 out:
 505     g_free(rlp);
 506     return ret;
 507 }
 508
 509 bool write_kvmstate_to_list(ARMCPU *cpu)
 510 {
 511     CPUState *cs = CPU(cpu);
 512     int i;
 513     bool ok = true;
 514
 515     for (i = 0; i < cpu->cpreg_array_len; i++) {
 516         struct kvm_one_reg r;
 517         uint64_t regidx = cpu->cpreg_indexes[i];
 518         uint32_t v32;
 519         int ret;
 520
 521         r.id = regidx;
 522
 523         switch (regidx & KVM_REG_SIZE_MASK) {
 524         case KVM_REG_SIZE_U32:
 525             r.addr = (uintptr_t)&v32;
 526             ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 527             if (!ret) {
 528                 cpu->cpreg_values[i] = v32;
 529             }
 530             break;
 531         case KVM_REG_SIZE_U64:
 532             r.addr = (uintptr_t)(cpu->cpreg_values + i);
 533             ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 534             break;
 535         default:
 536             abort();
 537         }
 538         if (ret) {
 539             ok = false;
 540         }
 541     }
 542     return ok;
 543 }
 544
 545 bool write_list_to_kvmstate(ARMCPU *cpu, int level)
 546 {
 547     CPUState *cs = CPU(cpu);
 548     int i;
 549     bool ok = true;
 550
 551     for (i = 0; i < cpu->cpreg_array_len; i++) {
 552         struct kvm_one_reg r;
 553         uint64_t regidx = cpu->cpreg_indexes[i];
 554         uint32_t v32;
 555         int ret;
 556
 557         if (kvm_arm_cpreg_level(regidx) > level) {
 558             continue;
 559         }
 560
 561         r.id = regidx;
 562         switch (regidx & KVM_REG_SIZE_MASK) {
 563         case KVM_REG_SIZE_U32:
 564             v32 = cpu->cpreg_values[i];
 565             r.addr = (uintptr_t)&v32;
 566             break;
 567         case KVM_REG_SIZE_U64:
 568             r.addr = (uintptr_t)(cpu->cpreg_values + i);
 569             break;
 570         default:
 571             abort();
 572         }
 573         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
 574         if (ret) {
 575             /* We might fail for "unknown register" and also for
 576              * "you tried to set a register which is constant with
 577              * a different value from what it actually contains".
 578              */
 579             ok = false;
 580         }
 581     }
 582     return ok;
 583 }
 584
 585 void kvm_arm_cpu_pre_save(ARMCPU *cpu)
 586 {
 587     /* KVM virtual time adjustment */
 588     if (cpu->kvm_vtime_dirty) {
 589         *kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT) = cpu->kvm_vtime;
 590     }
 591 }
 592
 593 void kvm_arm_cpu_post_load(ARMCPU *cpu)
 594 {
 595     /* KVM virtual time adjustment */
 596     if (cpu->kvm_adjvtime) {
 597         cpu->kvm_vtime = *kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT);
 598         cpu->kvm_vtime_dirty = true;
 599     }
 600 }
 601
 602 void kvm_arm_reset_vcpu(ARMCPU *cpu)
 603 {
 604     int ret;
 605
 606     /* Re-init VCPU so that all registers are set to
 607      * their respective reset values.
 608      */
 609     ret = kvm_arm_vcpu_init(CPU(cpu));
 610     if (ret < 0) {
 611         fprintf(stderr, "kvm_arm_vcpu_init failed: %s\n", strerror(-ret));
 612         abort();
 613     }
 614     if (!write_kvmstate_to_list(cpu)) {
 615         fprintf(stderr, "write_kvmstate_to_list failed\n");
 616         abort();
 617     }
 618     /*
 619      * Sync the reset values also into the CPUState. This is necessary
 620      * because the next thing we do will be a kvm_arch_put_registers()
 621      * which will update the list values from the CPUState before copying
 622      * the list values back to KVM. It's OK to ignore failure returns here
 623      * for the same reason we do so in kvm_arch_get_registers().
 624      */
 625     write_list_to_cpustate(cpu);
 626 }
 627
 628 /*
 629  * Update KVM's MP_STATE based on what QEMU thinks it is
 630  */
 631 int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu)
 632 {
 633     if (cap_has_mp_state) {
 634         struct kvm_mp_state mp_state = {
 635             .mp_state = (cpu->power_state == PSCI_OFF) ?
 636             KVM_MP_STATE_STOPPED : KVM_MP_STATE_RUNNABLE
 637         };
 638         int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
 639         if (ret) {
 640             fprintf(stderr, "%s: failed to set MP_STATE %d/%s\n",
 641                     __func__, ret, strerror(-ret));
 642             return -1;
 643         }
 644     }
 645
 646     return 0;
 647 }
 648
 649 /*
 650  * Sync the KVM MP_STATE into QEMU
 651  */
 652 int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu)
 653 {
 654     if (cap_has_mp_state) {
 655         struct kvm_mp_state mp_state;
 656         int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MP_STATE, &mp_state);
 657         if (ret) {
 658             fprintf(stderr, "%s: failed to get MP_STATE %d/%s\n",
 659                     __func__, ret, strerror(-ret));
 660             abort();
 661         }
 662         cpu->power_state = (mp_state.mp_state == KVM_MP_STATE_STOPPED) ?
 663             PSCI_OFF : PSCI_ON;
 664     }
 665
 666     return 0;
 667 }
 668
 669 void kvm_arm_get_virtual_time(CPUState *cs)
 670 {
 671     ARMCPU *cpu = ARM_CPU(cs);
 672     struct kvm_one_reg reg = {
 673         .id = KVM_REG_ARM_TIMER_CNT,
 674         .addr = (uintptr_t)&cpu->kvm_vtime,
 675     };
 676     int ret;
 677
 678     if (cpu->kvm_vtime_dirty) {
 679         return;
 680     }
 681
 682     ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 683     if (ret) {
 684         error_report("Failed to get KVM_REG_ARM_TIMER_CNT");
 685         abort();
 686     }
 687
 688     cpu->kvm_vtime_dirty = true;
 689 }
 690
 691 void kvm_arm_put_virtual_time(CPUState *cs)
 692 {
 693     ARMCPU *cpu = ARM_CPU(cs);
 694     struct kvm_one_reg reg = {
 695         .id = KVM_REG_ARM_TIMER_CNT,
 696         .addr = (uintptr_t)&cpu->kvm_vtime,
 697     };
 698     int ret;
 699
 700     if (!cpu->kvm_vtime_dirty) {
 701         return;
 702     }
 703
 704     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 705     if (ret) {
 706         error_report("Failed to set KVM_REG_ARM_TIMER_CNT");
 707         abort();
 708     }
 709
 710     cpu->kvm_vtime_dirty = false;
 711 }
 712
 713 int kvm_put_vcpu_events(ARMCPU *cpu)
 714 {
 715     CPUARMState *env = &cpu->env;
 716     struct kvm_vcpu_events events;
 717     int ret;
 718
 719     if (!kvm_has_vcpu_events()) {
 720         return 0;
 721     }
 722
 723     memset(&events, 0, sizeof(events));
 724     events.exception.serror_pending = env->serror.pending;
 725
 726     /* Inject SError to guest with specified syndrome if host kernel
 727      * supports it, otherwise inject SError without syndrome.
 728      */
 729     if (cap_has_inject_serror_esr) {
 730         events.exception.serror_has_esr = env->serror.has_esr;
 731         events.exception.serror_esr = env->serror.esr;
 732     }
 733
 734     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_VCPU_EVENTS, &events);
 735     if (ret) {
 736         error_report("failed to put vcpu events");
 737     }
 738
 739     return ret;
 740 }
 741
 742 int kvm_get_vcpu_events(ARMCPU *cpu)
 743 {
 744     CPUARMState *env = &cpu->env;
 745     struct kvm_vcpu_events events;
 746     int ret;
 747
 748     if (!kvm_has_vcpu_events()) {
 749         return 0;
 750     }
 751
 752     memset(&events, 0, sizeof(events));
 753     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_VCPU_EVENTS, &events);
 754     if (ret) {
 755         error_report("failed to get vcpu events");
 756         return ret;
 757     }
 758
 759     env->serror.pending = events.exception.serror_pending;
 760     env->serror.has_esr = events.exception.serror_has_esr;
 761     env->serror.esr = events.exception.serror_esr;
 762
 763     return 0;
 764 }
 765
 766 void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
 767 {
 768     ARMCPU *cpu = ARM_CPU(cs);
 769     CPUARMState *env = &cpu->env;
 770
 771     if (unlikely(env->ext_dabt_raised)) {
 772         /*
 773          * Verifying that the ext DABT has been properly injected,
 774          * otherwise risking indefinitely re-running the faulting instruction
 775          * Covering a very narrow case for kernels 5.5..5.5.4
 776          * when injected abort was misconfigured to be
 777          * an IMPLEMENTATION DEFINED exception (for 32-bit EL1)
 778          */
 779         if (!arm_feature(env, ARM_FEATURE_AARCH64) &&
 780             unlikely(!kvm_arm_verify_ext_dabt_pending(cs))) {
 781
 782             error_report("Data abort exception with no valid ISS generated by "
 783                    "guest memory access. KVM unable to emulate faulting "
 784                    "instruction. Failed to inject an external data abort "
 785                    "into the guest.");
 786             abort();
 787        }
 788        /* Clear the status */
 789        env->ext_dabt_raised = 0;
 790     }
 791 }
 792
 793 MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
 794 {
 795     ARMCPU *cpu;
 796     uint32_t switched_level;
 797
 798     if (kvm_irqchip_in_kernel()) {
 799         /*
 800          * We only need to sync timer states with user-space interrupt
 801          * controllers, so return early and save cycles if we don't.
 802          */
 803         return MEMTXATTRS_UNSPECIFIED;
 804     }
 805
 806     cpu = ARM_CPU(cs);
 807
 808     /* Synchronize our shadowed in-kernel device irq lines with the kvm ones */
 809     if (run->s.regs.device_irq_level != cpu->device_irq_level) {
 810         switched_level = cpu->device_irq_level ^ run->s.regs.device_irq_level;
 811
 812         qemu_mutex_lock_iothread();
 813
 814         if (switched_level & KVM_ARM_DEV_EL1_VTIMER) {
 815             qemu_set_irq(cpu->gt_timer_outputs[GTIMER_VIRT],
 816                          !!(run->s.regs.device_irq_level &
 817                             KVM_ARM_DEV_EL1_VTIMER));
 818             switched_level &= ~KVM_ARM_DEV_EL1_VTIMER;
 819         }
 820
 821         if (switched_level & KVM_ARM_DEV_EL1_PTIMER) {
 822             qemu_set_irq(cpu->gt_timer_outputs[GTIMER_PHYS],
 823                          !!(run->s.regs.device_irq_level &
 824                             KVM_ARM_DEV_EL1_PTIMER));
 825             switched_level &= ~KVM_ARM_DEV_EL1_PTIMER;
 826         }
 827
 828         if (switched_level & KVM_ARM_DEV_PMU) {
 829             qemu_set_irq(cpu->pmu_interrupt,
 830                          !!(run->s.regs.device_irq_level & KVM_ARM_DEV_PMU));
 831             switched_level &= ~KVM_ARM_DEV_PMU;
 832         }
 833
 834         if (switched_level) {
 835             qemu_log_mask(LOG_UNIMP, "%s: unhandled in-kernel device IRQ %x\n",
 836                           __func__, switched_level);
 837         }
 838
 839         /* We also mark unknown levels as processed to not waste cycles */
 840         cpu->device_irq_level = run->s.regs.device_irq_level;
 841         qemu_mutex_unlock_iothread();
 842     }
 843
 844     return MEMTXATTRS_UNSPECIFIED;
 845 }
 846
 847 void kvm_arm_vm_state_change(void *opaque, bool running, RunState state)
 848 {
 849     CPUState *cs = opaque;
 850     ARMCPU *cpu = ARM_CPU(cs);
 851
 852     if (running) {
 853         if (cpu->kvm_adjvtime) {
 854             kvm_arm_put_virtual_time(cs);
 855         }
 856     } else {
 857         if (cpu->kvm_adjvtime) {
 858             kvm_arm_get_virtual_time(cs);
 859         }
 860     }
 861 }
 862
 863 /**
 864  * kvm_arm_handle_dabt_nisv:
 865  * @cs: CPUState
 866  * @esr_iss: ISS encoding (limited) for the exception from Data Abort
 867  *           ISV bit set to '0b0' -> no valid instruction syndrome
 868  * @fault_ipa: faulting address for the synchronous data abort
 869  *
 870  * Returns: 0 if the exception has been handled, < 0 otherwise
 871  */
 872 static int kvm_arm_handle_dabt_nisv(CPUState *cs, uint64_t esr_iss,
 873                                     uint64_t fault_ipa)
 874 {
 875     ARMCPU *cpu = ARM_CPU(cs);
 876     CPUARMState *env = &cpu->env;
 877     /*
 878      * Request KVM to inject the external data abort into the guest
 879      */
 880     if (cap_has_inject_ext_dabt) {
 881         struct kvm_vcpu_events events = { };
 882         /*
 883          * The external data abort event will be handled immediately by KVM
 884          * using the address fault that triggered the exit on given VCPU.
 885          * Requesting injection of the external data abort does not rely
 886          * on any other VCPU state. Therefore, in this particular case, the VCPU
 887          * synchronization can be exceptionally skipped.
 888          */
 889         events.exception.ext_dabt_pending = 1;
 890         /* KVM_CAP_ARM_INJECT_EXT_DABT implies KVM_CAP_VCPU_EVENTS */
 891         if (!kvm_vcpu_ioctl(cs, KVM_SET_VCPU_EVENTS, &events)) {
 892             env->ext_dabt_raised = 1;
 893             return 0;
 894         }
 895     } else {
 896         error_report("Data abort exception triggered by guest memory access "
 897                      "at physical address: 0x"  TARGET_FMT_lx,
 898                      (target_ulong)fault_ipa);
 899         error_printf("KVM unable to emulate faulting instruction.\n");
 900     }
 901     return -1;
 902 }
 903
 904 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 905 {
 906     int ret = 0;
 907
 908     switch (run->exit_reason) {
 909     case KVM_EXIT_DEBUG:
 910         if (kvm_arm_handle_debug(cs, &run->debug.arch)) {
 911             ret = EXCP_DEBUG;
 912         } /* otherwise return to guest */
 913         break;
 914     case KVM_EXIT_ARM_NISV:
 915         /* External DABT with no valid iss to decode */
 916         ret = kvm_arm_handle_dabt_nisv(cs, run->arm_nisv.esr_iss,
 917                                        run->arm_nisv.fault_ipa);
 918         break;
 919     default:
 920         qemu_log_mask(LOG_UNIMP, "%s: un-handled exit reason %d\n",
 921                       __func__, run->exit_reason);
 922         break;
 923     }
 924     return ret;
 925 }
 926
 927 bool kvm_arch_stop_on_emulation_error(CPUState *cs)
 928 {
 929     return true;
 930 }
 931
 932 int kvm_arch_process_async_events(CPUState *cs)
 933 {
 934     return 0;
 935 }
 936
 937 void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg)
 938 {
 939     if (kvm_sw_breakpoints_active(cs)) {
 940         dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
 941     }
 942     if (kvm_arm_hw_debug_active(cs)) {
 943         dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW;
 944         kvm_arm_copy_hw_debug_data(&dbg->arch);
 945     }
 946 }
 947
 948 void kvm_arch_init_irq_routing(KVMState *s)
 949 {
 950 }
 951
 952 int kvm_arch_irqchip_create(KVMState *s)
 953 {
 954     if (kvm_kernel_irqchip_split()) {
 955         perror("-machine kernel_irqchip=split is not supported on ARM.");
 956         exit(1);
 957     }
 958
 959     /* If we can create the VGIC using the newer device control API, we
 960      * let the device do this when it initializes itself, otherwise we
 961      * fall back to the old API */
 962     return kvm_check_extension(s, KVM_CAP_DEVICE_CTRL);
 963 }
 964
 965 int kvm_arm_vgic_probe(void)
 966 {
 967     int val = 0;
 968
 969     if (kvm_create_device(kvm_state,
 970                           KVM_DEV_TYPE_ARM_VGIC_V3, true) == 0) {
 971         val |= KVM_ARM_VGIC_V3;
 972     }
 973     if (kvm_create_device(kvm_state,
 974                           KVM_DEV_TYPE_ARM_VGIC_V2, true) == 0) {
 975         val |= KVM_ARM_VGIC_V2;
 976     }
 977     return val;
 978 }
 979
 980 int kvm_arm_set_irq(int cpu, int irqtype, int irq, int level)
 981 {
 982     int kvm_irq = (irqtype << KVM_ARM_IRQ_TYPE_SHIFT) | irq;
 983     int cpu_idx1 = cpu % 256;
 984     int cpu_idx2 = cpu / 256;
 985
 986     kvm_irq |= (cpu_idx1 << KVM_ARM_IRQ_VCPU_SHIFT) |
 987                (cpu_idx2 << KVM_ARM_IRQ_VCPU2_SHIFT);
 988
 989     return kvm_set_irq(kvm_state, kvm_irq, !!level);
 990 }
 991
 992 int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
 993                              uint64_t address, uint32_t data, PCIDevice *dev)
 994 {
 995     AddressSpace *as = pci_device_iommu_address_space(dev);
 996     hwaddr xlat, len, doorbell_gpa;
 997     MemoryRegionSection mrs;
 998     MemoryRegion *mr;
 999     int ret = 1;
1000
1001     if (as == &address_space_memory) {
1002         return 0;
1003     }
1004
1005     /* MSI doorbell address is translated by an IOMMU */
1006
1007     rcu_read_lock();
1008     mr = address_space_translate(as, address, &xlat, &len, true,
1009                                  MEMTXATTRS_UNSPECIFIED);
1010     if (!mr) {
1011         goto unlock;
1012     }
1013     mrs = memory_region_find(mr, xlat, 1);
1014     if (!mrs.mr) {
1015         goto unlock;
1016     }
1017
1018     doorbell_gpa = mrs.offset_within_address_space;
1019     memory_region_unref(mrs.mr);
1020
1021     route->u.msi.address_lo = doorbell_gpa;
1022     route->u.msi.address_hi = doorbell_gpa >> 32;
1023
1024     trace_kvm_arm_fixup_msi_route(address, doorbell_gpa);
1025
1026     ret = 0;
1027
1028 unlock:
1029     rcu_read_unlock();
1030     return ret;
1031 }
1032
1033 int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
1034                                 int vector, PCIDevice *dev)
1035 {
1036     return 0;
1037 }
1038
1039 int kvm_arch_release_virq_post(int virq)
1040 {
1041     return 0;
1042 }
1043
1044 int kvm_arch_msi_data_to_gsi(uint32_t data)
1045 {
1046     return (data - 32) & 0xffff;
1047 }
1048
1049 bool kvm_arch_cpu_check_are_resettable(void)
1050 {
1051     return true;
1052 }