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/timer.h"
  17 #include "qemu/error-report.h"
  18 #include "qemu/main-loop.h"
  19 #include "qom/object.h"
  20 #include "qapi/error.h"
  21 #include "sysemu/sysemu.h"
  22 #include "sysemu/kvm.h"
  23 #include "sysemu/kvm_int.h"
  24 #include "kvm_arm.h"
  25 #include "cpu.h"
  26 #include "trace.h"
  27 #include "internals.h"
  28 #include "hw/pci/pci.h"
  29 #include "exec/memattrs.h"
  30 #include "exec/address-spaces.h"
  31 #include "hw/boards.h"
  32 #include "hw/irq.h"
  33 #include "qapi/visitor.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     int max_vm_pa_size;
  74
  75     kvmfd = qemu_open_old("/dev/kvm", O_RDWR);
  76     if (kvmfd < 0) {
  77         goto err;
  78     }
  79     max_vm_pa_size = ioctl(kvmfd, KVM_CHECK_EXTENSION, KVM_CAP_ARM_VM_IPA_SIZE);
  80     if (max_vm_pa_size < 0) {
  81         max_vm_pa_size = 0;
  82     }
  83     do {
  84         vmfd = ioctl(kvmfd, KVM_CREATE_VM, max_vm_pa_size);
  85     } while (vmfd == -1 && errno == EINTR);
  86     if (vmfd < 0) {
  87         goto err;
  88     }
  89     cpufd = ioctl(vmfd, KVM_CREATE_VCPU, 0);
  90     if (cpufd < 0) {
  91         goto err;
  92     }
  93
  94     if (!init) {
  95         /* Caller doesn't want the VCPU to be initialized, so skip it */
  96         goto finish;
  97     }
  98
  99     if (init->target == -1) {
 100         struct kvm_vcpu_init preferred;
 101
 102         ret = ioctl(vmfd, KVM_ARM_PREFERRED_TARGET, &preferred);
 103         if (!ret) {
 104             init->target = preferred.target;
 105         }
 106     }
 107     if (ret >= 0) {
 108         ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, init);
 109         if (ret < 0) {
 110             goto err;
 111         }
 112     } else if (cpus_to_try) {
 113         /* Old kernel which doesn't know about the
 114          * PREFERRED_TARGET ioctl: we know it will only support
 115          * creating one kind of guest CPU which is its preferred
 116          * CPU type.
 117          */
 118         struct kvm_vcpu_init try;
 119
 120         while (*cpus_to_try != QEMU_KVM_ARM_TARGET_NONE) {
 121             try.target = *cpus_to_try++;
 122             memcpy(try.features, init->features, sizeof(init->features));
 123             ret = ioctl(cpufd, KVM_ARM_VCPU_INIT, &try);
 124             if (ret >= 0) {
 125                 break;
 126             }
 127         }
 128         if (ret < 0) {
 129             goto err;
 130         }
 131         init->target = try.target;
 132     } else {
 133         /* Treat a NULL cpus_to_try argument the same as an empty
 134          * list, which means we will fail the call since this must
 135          * be an old kernel which doesn't support PREFERRED_TARGET.
 136          */
 137         goto err;
 138     }
 139
 140 finish:
 141     fdarray[0] = kvmfd;
 142     fdarray[1] = vmfd;
 143     fdarray[2] = cpufd;
 144
 145     return true;
 146
 147 err:
 148     if (cpufd >= 0) {
 149         close(cpufd);
 150     }
 151     if (vmfd >= 0) {
 152         close(vmfd);
 153     }
 154     if (kvmfd >= 0) {
 155         close(kvmfd);
 156     }
 157
 158     return false;
 159 }
 160
 161 void kvm_arm_destroy_scratch_host_vcpu(int *fdarray)
 162 {
 163     int i;
 164
 165     for (i = 2; i >= 0; i--) {
 166         close(fdarray[i]);
 167     }
 168 }
 169
 170 void kvm_arm_set_cpu_features_from_host(ARMCPU *cpu)
 171 {
 172     CPUARMState *env = &cpu->env;
 173
 174     if (!arm_host_cpu_features.dtb_compatible) {
 175         if (!kvm_enabled() ||
 176             !kvm_arm_get_host_cpu_features(&arm_host_cpu_features)) {
 177             /* We can't report this error yet, so flag that we need to
 178              * in arm_cpu_realizefn().
 179              */
 180             cpu->kvm_target = QEMU_KVM_ARM_TARGET_NONE;
 181             cpu->host_cpu_probe_failed = true;
 182             return;
 183         }
 184     }
 185
 186     cpu->kvm_target = arm_host_cpu_features.target;
 187     cpu->dtb_compatible = arm_host_cpu_features.dtb_compatible;
 188     cpu->isar = arm_host_cpu_features.isar;
 189     env->features = arm_host_cpu_features.features;
 190 }
 191
 192 static bool kvm_no_adjvtime_get(Object *obj, Error **errp)
 193 {
 194     return !ARM_CPU(obj)->kvm_adjvtime;
 195 }
 196
 197 static void kvm_no_adjvtime_set(Object *obj, bool value, Error **errp)
 198 {
 199     ARM_CPU(obj)->kvm_adjvtime = !value;
 200 }
 201
 202 static bool kvm_steal_time_get(Object *obj, Error **errp)
 203 {
 204     return ARM_CPU(obj)->kvm_steal_time != ON_OFF_AUTO_OFF;
 205 }
 206
 207 static void kvm_steal_time_set(Object *obj, bool value, Error **errp)
 208 {
 209     ARM_CPU(obj)->kvm_steal_time = value ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
 210 }
 211
 212 /* KVM VCPU properties should be prefixed with "kvm-". */
 213 void kvm_arm_add_vcpu_properties(Object *obj)
 214 {
 215     ARMCPU *cpu = ARM_CPU(obj);
 216     CPUARMState *env = &cpu->env;
 217
 218     if (arm_feature(env, ARM_FEATURE_GENERIC_TIMER)) {
 219         cpu->kvm_adjvtime = true;
 220         object_property_add_bool(obj, "kvm-no-adjvtime", kvm_no_adjvtime_get,
 221                                  kvm_no_adjvtime_set);
 222         object_property_set_description(obj, "kvm-no-adjvtime",
 223                                         "Set on to disable the adjustment of "
 224                                         "the virtual counter. VM stopped time "
 225                                         "will be counted.");
 226     }
 227
 228     cpu->kvm_steal_time = ON_OFF_AUTO_AUTO;
 229     object_property_add_bool(obj, "kvm-steal-time", kvm_steal_time_get,
 230                              kvm_steal_time_set);
 231     object_property_set_description(obj, "kvm-steal-time",
 232                                     "Set off to disable KVM steal time.");
 233 }
 234
 235 bool kvm_arm_pmu_supported(void)
 236 {
 237     return kvm_check_extension(kvm_state, KVM_CAP_ARM_PMU_V3);
 238 }
 239
 240 int kvm_arm_get_max_vm_ipa_size(MachineState *ms, bool *fixed_ipa)
 241 {
 242     KVMState *s = KVM_STATE(ms->accelerator);
 243     int ret;
 244
 245     ret = kvm_check_extension(s, KVM_CAP_ARM_VM_IPA_SIZE);
 246     *fixed_ipa = ret <= 0;
 247
 248     return ret > 0 ? ret : 40;
 249 }
 250
 251 int kvm_arch_get_default_type(MachineState *ms)
 252 {
 253     bool fixed_ipa;
 254     int size = kvm_arm_get_max_vm_ipa_size(ms, &fixed_ipa);
 255     return fixed_ipa ? 0 : size;
 256 }
 257
 258 int kvm_arch_init(MachineState *ms, KVMState *s)
 259 {
 260     int ret = 0;
 261     /* For ARM interrupt delivery is always asynchronous,
 262      * whether we are using an in-kernel VGIC or not.
 263      */
 264     kvm_async_interrupts_allowed = true;
 265
 266     /*
 267      * PSCI wakes up secondary cores, so we always need to
 268      * have vCPUs waiting in kernel space
 269      */
 270     kvm_halt_in_kernel_allowed = true;
 271
 272     cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
 273
 274     if (ms->smp.cpus > 256 &&
 275         !kvm_check_extension(s, KVM_CAP_ARM_IRQ_LINE_LAYOUT_2)) {
 276         error_report("Using more than 256 vcpus requires a host kernel "
 277                      "with KVM_CAP_ARM_IRQ_LINE_LAYOUT_2");
 278         ret = -EINVAL;
 279     }
 280
 281     if (kvm_check_extension(s, KVM_CAP_ARM_NISV_TO_USER)) {
 282         if (kvm_vm_enable_cap(s, KVM_CAP_ARM_NISV_TO_USER, 0)) {
 283             error_report("Failed to enable KVM_CAP_ARM_NISV_TO_USER cap");
 284         } else {
 285             /* Set status for supporting the external dabt injection */
 286             cap_has_inject_ext_dabt = kvm_check_extension(s,
 287                                     KVM_CAP_ARM_INJECT_EXT_DABT);
 288         }
 289     }
 290
 291     if (s->kvm_eager_split_size) {
 292         uint32_t sizes;
 293
 294         sizes = kvm_vm_check_extension(s, KVM_CAP_ARM_SUPPORTED_BLOCK_SIZES);
 295         if (!sizes) {
 296             s->kvm_eager_split_size = 0;
 297             warn_report("Eager Page Split support not available");
 298         } else if (!(s->kvm_eager_split_size & sizes)) {
 299             error_report("Eager Page Split requested chunk size not valid");
 300             ret = -EINVAL;
 301         } else {
 302             ret = kvm_vm_enable_cap(s, KVM_CAP_ARM_EAGER_SPLIT_CHUNK_SIZE, 0,
 303                                     s->kvm_eager_split_size);
 304             if (ret < 0) {
 305                 error_report("Enabling of Eager Page Split failed: %s",
 306                              strerror(-ret));
 307             }
 308         }
 309     }
 310
 311     kvm_arm_init_debug(s);
 312
 313     return ret;
 314 }
 315
 316 unsigned long kvm_arch_vcpu_id(CPUState *cpu)
 317 {
 318     return cpu->cpu_index;
 319 }
 320
 321 /* We track all the KVM devices which need their memory addresses
 322  * passing to the kernel in a list of these structures.
 323  * When board init is complete we run through the list and
 324  * tell the kernel the base addresses of the memory regions.
 325  * We use a MemoryListener to track mapping and unmapping of
 326  * the regions during board creation, so the board models don't
 327  * need to do anything special for the KVM case.
 328  *
 329  * Sometimes the address must be OR'ed with some other fields
 330  * (for example for KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION).
 331  * @kda_addr_ormask aims at storing the value of those fields.
 332  */
 333 typedef struct KVMDevice {
 334     struct kvm_arm_device_addr kda;
 335     struct kvm_device_attr kdattr;
 336     uint64_t kda_addr_ormask;
 337     MemoryRegion *mr;
 338     QSLIST_ENTRY(KVMDevice) entries;
 339     int dev_fd;
 340 } KVMDevice;
 341
 342 static QSLIST_HEAD(, KVMDevice) kvm_devices_head;
 343
 344 static void kvm_arm_devlistener_add(MemoryListener *listener,
 345                                     MemoryRegionSection *section)
 346 {
 347     KVMDevice *kd;
 348
 349     QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
 350         if (section->mr == kd->mr) {
 351             kd->kda.addr = section->offset_within_address_space;
 352         }
 353     }
 354 }
 355
 356 static void kvm_arm_devlistener_del(MemoryListener *listener,
 357                                     MemoryRegionSection *section)
 358 {
 359     KVMDevice *kd;
 360
 361     QSLIST_FOREACH(kd, &kvm_devices_head, entries) {
 362         if (section->mr == kd->mr) {
 363             kd->kda.addr = -1;
 364         }
 365     }
 366 }
 367
 368 static MemoryListener devlistener = {
 369     .name = "kvm-arm",
 370     .region_add = kvm_arm_devlistener_add,
 371     .region_del = kvm_arm_devlistener_del,
 372     .priority = MEMORY_LISTENER_PRIORITY_MIN,
 373 };
 374
 375 static void kvm_arm_set_device_addr(KVMDevice *kd)
 376 {
 377     struct kvm_device_attr *attr = &kd->kdattr;
 378     int ret;
 379
 380     /* If the device control API is available and we have a device fd on the
 381      * KVMDevice struct, let's use the newer API
 382      */
 383     if (kd->dev_fd >= 0) {
 384         uint64_t addr = kd->kda.addr;
 385
 386         addr |= kd->kda_addr_ormask;
 387         attr->addr = (uintptr_t)&addr;
 388         ret = kvm_device_ioctl(kd->dev_fd, KVM_SET_DEVICE_ATTR, attr);
 389     } else {
 390         ret = kvm_vm_ioctl(kvm_state, KVM_ARM_SET_DEVICE_ADDR, &kd->kda);
 391     }
 392
 393     if (ret < 0) {
 394         fprintf(stderr, "Failed to set device address: %s\n",
 395                 strerror(-ret));
 396         abort();
 397     }
 398 }
 399
 400 static void kvm_arm_machine_init_done(Notifier *notifier, void *data)
 401 {
 402     KVMDevice *kd, *tkd;
 403
 404     QSLIST_FOREACH_SAFE(kd, &kvm_devices_head, entries, tkd) {
 405         if (kd->kda.addr != -1) {
 406             kvm_arm_set_device_addr(kd);
 407         }
 408         memory_region_unref(kd->mr);
 409         QSLIST_REMOVE_HEAD(&kvm_devices_head, entries);
 410         g_free(kd);
 411     }
 412     memory_listener_unregister(&devlistener);
 413 }
 414
 415 static Notifier notify = {
 416     .notify = kvm_arm_machine_init_done,
 417 };
 418
 419 void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid, uint64_t group,
 420                              uint64_t attr, int dev_fd, uint64_t addr_ormask)
 421 {
 422     KVMDevice *kd;
 423
 424     if (!kvm_irqchip_in_kernel()) {
 425         return;
 426     }
 427
 428     if (QSLIST_EMPTY(&kvm_devices_head)) {
 429         memory_listener_register(&devlistener, &address_space_memory);
 430         qemu_add_machine_init_done_notifier(&notify);
 431     }
 432     kd = g_new0(KVMDevice, 1);
 433     kd->mr = mr;
 434     kd->kda.id = devid;
 435     kd->kda.addr = -1;
 436     kd->kdattr.flags = 0;
 437     kd->kdattr.group = group;
 438     kd->kdattr.attr = attr;
 439     kd->dev_fd = dev_fd;
 440     kd->kda_addr_ormask = addr_ormask;
 441     QSLIST_INSERT_HEAD(&kvm_devices_head, kd, entries);
 442     memory_region_ref(kd->mr);
 443 }
 444
 445 static int compare_u64(const void *a, const void *b)
 446 {
 447     if (*(uint64_t *)a > *(uint64_t *)b) {
 448         return 1;
 449     }
 450     if (*(uint64_t *)a < *(uint64_t *)b) {
 451         return -1;
 452     }
 453     return 0;
 454 }
 455
 456 /*
 457  * cpreg_values are sorted in ascending order by KVM register ID
 458  * (see kvm_arm_init_cpreg_list). This allows us to cheaply find
 459  * the storage for a KVM register by ID with a binary search.
 460  */
 461 static uint64_t *kvm_arm_get_cpreg_ptr(ARMCPU *cpu, uint64_t regidx)
 462 {
 463     uint64_t *res;
 464
 465     res = bsearch(&regidx, cpu->cpreg_indexes, cpu->cpreg_array_len,
 466                   sizeof(uint64_t), compare_u64);
 467     assert(res);
 468
 469     return &cpu->cpreg_values[res - cpu->cpreg_indexes];
 470 }
 471
 472 /* Initialize the ARMCPU cpreg list according to the kernel's
 473  * definition of what CPU registers it knows about (and throw away
 474  * the previous TCG-created cpreg list).
 475  */
 476 int kvm_arm_init_cpreg_list(ARMCPU *cpu)
 477 {
 478     struct kvm_reg_list rl;
 479     struct kvm_reg_list *rlp;
 480     int i, ret, arraylen;
 481     CPUState *cs = CPU(cpu);
 482
 483     rl.n = 0;
 484     ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, &rl);
 485     if (ret != -E2BIG) {
 486         return ret;
 487     }
 488     rlp = g_malloc(sizeof(struct kvm_reg_list) + rl.n * sizeof(uint64_t));
 489     rlp->n = rl.n;
 490     ret = kvm_vcpu_ioctl(cs, KVM_GET_REG_LIST, rlp);
 491     if (ret) {
 492         goto out;
 493     }
 494     /* Sort the list we get back from the kernel, since cpreg_tuples
 495      * must be in strictly ascending order.
 496      */
 497     qsort(&rlp->reg, rlp->n, sizeof(rlp->reg[0]), compare_u64);
 498
 499     for (i = 0, arraylen = 0; i < rlp->n; i++) {
 500         if (!kvm_arm_reg_syncs_via_cpreg_list(rlp->reg[i])) {
 501             continue;
 502         }
 503         switch (rlp->reg[i] & KVM_REG_SIZE_MASK) {
 504         case KVM_REG_SIZE_U32:
 505         case KVM_REG_SIZE_U64:
 506             break;
 507         default:
 508             fprintf(stderr, "Can't handle size of register in kernel list\n");
 509             ret = -EINVAL;
 510             goto out;
 511         }
 512
 513         arraylen++;
 514     }
 515
 516     cpu->cpreg_indexes = g_renew(uint64_t, cpu->cpreg_indexes, arraylen);
 517     cpu->cpreg_values = g_renew(uint64_t, cpu->cpreg_values, arraylen);
 518     cpu->cpreg_vmstate_indexes = g_renew(uint64_t, cpu->cpreg_vmstate_indexes,
 519                                          arraylen);
 520     cpu->cpreg_vmstate_values = g_renew(uint64_t, cpu->cpreg_vmstate_values,
 521                                         arraylen);
 522     cpu->cpreg_array_len = arraylen;
 523     cpu->cpreg_vmstate_array_len = arraylen;
 524
 525     for (i = 0, arraylen = 0; i < rlp->n; i++) {
 526         uint64_t regidx = rlp->reg[i];
 527         if (!kvm_arm_reg_syncs_via_cpreg_list(regidx)) {
 528             continue;
 529         }
 530         cpu->cpreg_indexes[arraylen] = regidx;
 531         arraylen++;
 532     }
 533     assert(cpu->cpreg_array_len == arraylen);
 534
 535     if (!write_kvmstate_to_list(cpu)) {
 536         /* Shouldn't happen unless kernel is inconsistent about
 537          * what registers exist.
 538          */
 539         fprintf(stderr, "Initial read of kernel register state failed\n");
 540         ret = -EINVAL;
 541         goto out;
 542     }
 543
 544 out:
 545     g_free(rlp);
 546     return ret;
 547 }
 548
 549 bool write_kvmstate_to_list(ARMCPU *cpu)
 550 {
 551     CPUState *cs = CPU(cpu);
 552     int i;
 553     bool ok = true;
 554
 555     for (i = 0; i < cpu->cpreg_array_len; i++) {
 556         struct kvm_one_reg r;
 557         uint64_t regidx = cpu->cpreg_indexes[i];
 558         uint32_t v32;
 559         int ret;
 560
 561         r.id = regidx;
 562
 563         switch (regidx & KVM_REG_SIZE_MASK) {
 564         case KVM_REG_SIZE_U32:
 565             r.addr = (uintptr_t)&v32;
 566             ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 567             if (!ret) {
 568                 cpu->cpreg_values[i] = v32;
 569             }
 570             break;
 571         case KVM_REG_SIZE_U64:
 572             r.addr = (uintptr_t)(cpu->cpreg_values + i);
 573             ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r);
 574             break;
 575         default:
 576             g_assert_not_reached();
 577         }
 578         if (ret) {
 579             ok = false;
 580         }
 581     }
 582     return ok;
 583 }
 584
 585 bool write_list_to_kvmstate(ARMCPU *cpu, int level)
 586 {
 587     CPUState *cs = CPU(cpu);
 588     int i;
 589     bool ok = true;
 590
 591     for (i = 0; i < cpu->cpreg_array_len; i++) {
 592         struct kvm_one_reg r;
 593         uint64_t regidx = cpu->cpreg_indexes[i];
 594         uint32_t v32;
 595         int ret;
 596
 597         if (kvm_arm_cpreg_level(regidx) > level) {
 598             continue;
 599         }
 600
 601         r.id = regidx;
 602         switch (regidx & KVM_REG_SIZE_MASK) {
 603         case KVM_REG_SIZE_U32:
 604             v32 = cpu->cpreg_values[i];
 605             r.addr = (uintptr_t)&v32;
 606             break;
 607         case KVM_REG_SIZE_U64:
 608             r.addr = (uintptr_t)(cpu->cpreg_values + i);
 609             break;
 610         default:
 611             g_assert_not_reached();
 612         }
 613         ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r);
 614         if (ret) {
 615             /* We might fail for "unknown register" and also for
 616              * "you tried to set a register which is constant with
 617              * a different value from what it actually contains".
 618              */
 619             ok = false;
 620         }
 621     }
 622     return ok;
 623 }
 624
 625 void kvm_arm_cpu_pre_save(ARMCPU *cpu)
 626 {
 627     /* KVM virtual time adjustment */
 628     if (cpu->kvm_vtime_dirty) {
 629         *kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT) = cpu->kvm_vtime;
 630     }
 631 }
 632
 633 void kvm_arm_cpu_post_load(ARMCPU *cpu)
 634 {
 635     /* KVM virtual time adjustment */
 636     if (cpu->kvm_adjvtime) {
 637         cpu->kvm_vtime = *kvm_arm_get_cpreg_ptr(cpu, KVM_REG_ARM_TIMER_CNT);
 638         cpu->kvm_vtime_dirty = true;
 639     }
 640 }
 641
 642 void kvm_arm_reset_vcpu(ARMCPU *cpu)
 643 {
 644     int ret;
 645
 646     /* Re-init VCPU so that all registers are set to
 647      * their respective reset values.
 648      */
 649     ret = kvm_arm_vcpu_init(CPU(cpu));
 650     if (ret < 0) {
 651         fprintf(stderr, "kvm_arm_vcpu_init failed: %s\n", strerror(-ret));
 652         abort();
 653     }
 654     if (!write_kvmstate_to_list(cpu)) {
 655         fprintf(stderr, "write_kvmstate_to_list failed\n");
 656         abort();
 657     }
 658     /*
 659      * Sync the reset values also into the CPUState. This is necessary
 660      * because the next thing we do will be a kvm_arch_put_registers()
 661      * which will update the list values from the CPUState before copying
 662      * the list values back to KVM. It's OK to ignore failure returns here
 663      * for the same reason we do so in kvm_arch_get_registers().
 664      */
 665     write_list_to_cpustate(cpu);
 666 }
 667
 668 /*
 669  * Update KVM's MP_STATE based on what QEMU thinks it is
 670  */
 671 int kvm_arm_sync_mpstate_to_kvm(ARMCPU *cpu)
 672 {
 673     if (cap_has_mp_state) {
 674         struct kvm_mp_state mp_state = {
 675             .mp_state = (cpu->power_state == PSCI_OFF) ?
 676             KVM_MP_STATE_STOPPED : KVM_MP_STATE_RUNNABLE
 677         };
 678         int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
 679         if (ret) {
 680             fprintf(stderr, "%s: failed to set MP_STATE %d/%s\n",
 681                     __func__, ret, strerror(-ret));
 682             return -1;
 683         }
 684     }
 685
 686     return 0;
 687 }
 688
 689 /*
 690  * Sync the KVM MP_STATE into QEMU
 691  */
 692 int kvm_arm_sync_mpstate_to_qemu(ARMCPU *cpu)
 693 {
 694     if (cap_has_mp_state) {
 695         struct kvm_mp_state mp_state;
 696         int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MP_STATE, &mp_state);
 697         if (ret) {
 698             fprintf(stderr, "%s: failed to get MP_STATE %d/%s\n",
 699                     __func__, ret, strerror(-ret));
 700             abort();
 701         }
 702         cpu->power_state = (mp_state.mp_state == KVM_MP_STATE_STOPPED) ?
 703             PSCI_OFF : PSCI_ON;
 704     }
 705
 706     return 0;
 707 }
 708
 709 void kvm_arm_get_virtual_time(CPUState *cs)
 710 {
 711     ARMCPU *cpu = ARM_CPU(cs);
 712     struct kvm_one_reg reg = {
 713         .id = KVM_REG_ARM_TIMER_CNT,
 714         .addr = (uintptr_t)&cpu->kvm_vtime,
 715     };
 716     int ret;
 717
 718     if (cpu->kvm_vtime_dirty) {
 719         return;
 720     }
 721
 722     ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
 723     if (ret) {
 724         error_report("Failed to get KVM_REG_ARM_TIMER_CNT");
 725         abort();
 726     }
 727
 728     cpu->kvm_vtime_dirty = true;
 729 }
 730
 731 void kvm_arm_put_virtual_time(CPUState *cs)
 732 {
 733     ARMCPU *cpu = ARM_CPU(cs);
 734     struct kvm_one_reg reg = {
 735         .id = KVM_REG_ARM_TIMER_CNT,
 736         .addr = (uintptr_t)&cpu->kvm_vtime,
 737     };
 738     int ret;
 739
 740     if (!cpu->kvm_vtime_dirty) {
 741         return;
 742     }
 743
 744     ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
 745     if (ret) {
 746         error_report("Failed to set KVM_REG_ARM_TIMER_CNT");
 747         abort();
 748     }
 749
 750     cpu->kvm_vtime_dirty = false;
 751 }
 752
 753 int kvm_put_vcpu_events(ARMCPU *cpu)
 754 {
 755     CPUARMState *env = &cpu->env;
 756     struct kvm_vcpu_events events;
 757     int ret;
 758
 759     if (!kvm_has_vcpu_events()) {
 760         return 0;
 761     }
 762
 763     memset(&events, 0, sizeof(events));
 764     events.exception.serror_pending = env->serror.pending;
 765
 766     /* Inject SError to guest with specified syndrome if host kernel
 767      * supports it, otherwise inject SError without syndrome.
 768      */
 769     if (cap_has_inject_serror_esr) {
 770         events.exception.serror_has_esr = env->serror.has_esr;
 771         events.exception.serror_esr = env->serror.esr;
 772     }
 773
 774     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_VCPU_EVENTS, &events);
 775     if (ret) {
 776         error_report("failed to put vcpu events");
 777     }
 778
 779     return ret;
 780 }
 781
 782 int kvm_get_vcpu_events(ARMCPU *cpu)
 783 {
 784     CPUARMState *env = &cpu->env;
 785     struct kvm_vcpu_events events;
 786     int ret;
 787
 788     if (!kvm_has_vcpu_events()) {
 789         return 0;
 790     }
 791
 792     memset(&events, 0, sizeof(events));
 793     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_VCPU_EVENTS, &events);
 794     if (ret) {
 795         error_report("failed to get vcpu events");
 796         return ret;
 797     }
 798
 799     env->serror.pending = events.exception.serror_pending;
 800     env->serror.has_esr = events.exception.serror_has_esr;
 801     env->serror.esr = events.exception.serror_esr;
 802
 803     return 0;
 804 }
 805
 806 void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run)
 807 {
 808     ARMCPU *cpu = ARM_CPU(cs);
 809     CPUARMState *env = &cpu->env;
 810
 811     if (unlikely(env->ext_dabt_raised)) {
 812         /*
 813          * Verifying that the ext DABT has been properly injected,
 814          * otherwise risking indefinitely re-running the faulting instruction
 815          * Covering a very narrow case for kernels 5.5..5.5.4
 816          * when injected abort was misconfigured to be
 817          * an IMPLEMENTATION DEFINED exception (for 32-bit EL1)
 818          */
 819         if (!arm_feature(env, ARM_FEATURE_AARCH64) &&
 820             unlikely(!kvm_arm_verify_ext_dabt_pending(cs))) {
 821
 822             error_report("Data abort exception with no valid ISS generated by "
 823                    "guest memory access. KVM unable to emulate faulting "
 824                    "instruction. Failed to inject an external data abort "
 825                    "into the guest.");
 826             abort();
 827        }
 828        /* Clear the status */
 829        env->ext_dabt_raised = 0;
 830     }
 831 }
 832
 833 MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
 834 {
 835     ARMCPU *cpu;
 836     uint32_t switched_level;
 837
 838     if (kvm_irqchip_in_kernel()) {
 839         /*
 840          * We only need to sync timer states with user-space interrupt
 841          * controllers, so return early and save cycles if we don't.
 842          */
 843         return MEMTXATTRS_UNSPECIFIED;
 844     }
 845
 846     cpu = ARM_CPU(cs);
 847
 848     /* Synchronize our shadowed in-kernel device irq lines with the kvm ones */
 849     if (run->s.regs.device_irq_level != cpu->device_irq_level) {
 850         switched_level = cpu->device_irq_level ^ run->s.regs.device_irq_level;
 851
 852         qemu_mutex_lock_iothread();
 853
 854         if (switched_level & KVM_ARM_DEV_EL1_VTIMER) {
 855             qemu_set_irq(cpu->gt_timer_outputs[GTIMER_VIRT],
 856                          !!(run->s.regs.device_irq_level &
 857                             KVM_ARM_DEV_EL1_VTIMER));
 858             switched_level &= ~KVM_ARM_DEV_EL1_VTIMER;
 859         }
 860
 861         if (switched_level & KVM_ARM_DEV_EL1_PTIMER) {
 862             qemu_set_irq(cpu->gt_timer_outputs[GTIMER_PHYS],
 863                          !!(run->s.regs.device_irq_level &
 864                             KVM_ARM_DEV_EL1_PTIMER));
 865             switched_level &= ~KVM_ARM_DEV_EL1_PTIMER;
 866         }
 867
 868         if (switched_level & KVM_ARM_DEV_PMU) {
 869             qemu_set_irq(cpu->pmu_interrupt,
 870                          !!(run->s.regs.device_irq_level & KVM_ARM_DEV_PMU));
 871             switched_level &= ~KVM_ARM_DEV_PMU;
 872         }
 873
 874         if (switched_level) {
 875             qemu_log_mask(LOG_UNIMP, "%s: unhandled in-kernel device IRQ %x\n",
 876                           __func__, switched_level);
 877         }
 878
 879         /* We also mark unknown levels as processed to not waste cycles */
 880         cpu->device_irq_level = run->s.regs.device_irq_level;
 881         qemu_mutex_unlock_iothread();
 882     }
 883
 884     return MEMTXATTRS_UNSPECIFIED;
 885 }
 886
 887 void kvm_arm_vm_state_change(void *opaque, bool running, RunState state)
 888 {
 889     CPUState *cs = opaque;
 890     ARMCPU *cpu = ARM_CPU(cs);
 891
 892     if (running) {
 893         if (cpu->kvm_adjvtime) {
 894             kvm_arm_put_virtual_time(cs);
 895         }
 896     } else {
 897         if (cpu->kvm_adjvtime) {
 898             kvm_arm_get_virtual_time(cs);
 899         }
 900     }
 901 }
 902
 903 /**
 904  * kvm_arm_handle_dabt_nisv:
 905  * @cs: CPUState
 906  * @esr_iss: ISS encoding (limited) for the exception from Data Abort
 907  *           ISV bit set to '0b0' -> no valid instruction syndrome
 908  * @fault_ipa: faulting address for the synchronous data abort
 909  *
 910  * Returns: 0 if the exception has been handled, < 0 otherwise
 911  */
 912 static int kvm_arm_handle_dabt_nisv(CPUState *cs, uint64_t esr_iss,
 913                                     uint64_t fault_ipa)
 914 {
 915     ARMCPU *cpu = ARM_CPU(cs);
 916     CPUARMState *env = &cpu->env;
 917     /*
 918      * Request KVM to inject the external data abort into the guest
 919      */
 920     if (cap_has_inject_ext_dabt) {
 921         struct kvm_vcpu_events events = { };
 922         /*
 923          * The external data abort event will be handled immediately by KVM
 924          * using the address fault that triggered the exit on given VCPU.
 925          * Requesting injection of the external data abort does not rely
 926          * on any other VCPU state. Therefore, in this particular case, the VCPU
 927          * synchronization can be exceptionally skipped.
 928          */
 929         events.exception.ext_dabt_pending = 1;
 930         /* KVM_CAP_ARM_INJECT_EXT_DABT implies KVM_CAP_VCPU_EVENTS */
 931         if (!kvm_vcpu_ioctl(cs, KVM_SET_VCPU_EVENTS, &events)) {
 932             env->ext_dabt_raised = 1;
 933             return 0;
 934         }
 935     } else {
 936         error_report("Data abort exception triggered by guest memory access "
 937                      "at physical address: 0x"  TARGET_FMT_lx,
 938                      (target_ulong)fault_ipa);
 939         error_printf("KVM unable to emulate faulting instruction.\n");
 940     }
 941     return -1;
 942 }
 943
 944 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 945 {
 946     int ret = 0;
 947
 948     switch (run->exit_reason) {
 949     case KVM_EXIT_DEBUG:
 950         if (kvm_arm_handle_debug(cs, &run->debug.arch)) {
 951             ret = EXCP_DEBUG;
 952         } /* otherwise return to guest */
 953         break;
 954     case KVM_EXIT_ARM_NISV:
 955         /* External DABT with no valid iss to decode */
 956         ret = kvm_arm_handle_dabt_nisv(cs, run->arm_nisv.esr_iss,
 957                                        run->arm_nisv.fault_ipa);
 958         break;
 959     default:
 960         qemu_log_mask(LOG_UNIMP, "%s: un-handled exit reason %d\n",
 961                       __func__, run->exit_reason);
 962         break;
 963     }
 964     return ret;
 965 }
 966
 967 bool kvm_arch_stop_on_emulation_error(CPUState *cs)
 968 {
 969     return true;
 970 }
 971
 972 int kvm_arch_process_async_events(CPUState *cs)
 973 {
 974     return 0;
 975 }
 976
 977 void kvm_arch_update_guest_debug(CPUState *cs, struct kvm_guest_debug *dbg)
 978 {
 979     if (kvm_sw_breakpoints_active(cs)) {
 980         dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
 981     }
 982     if (kvm_arm_hw_debug_active(cs)) {
 983         dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW;
 984         kvm_arm_copy_hw_debug_data(&dbg->arch);
 985     }
 986 }
 987
 988 void kvm_arch_init_irq_routing(KVMState *s)
 989 {
 990 }
 991
 992 int kvm_arch_irqchip_create(KVMState *s)
 993 {
 994     if (kvm_kernel_irqchip_split()) {
 995         error_report("-machine kernel_irqchip=split is not supported on ARM.");
 996         exit(1);
 997     }
 998
 999     /* If we can create the VGIC using the newer device control API, we
1000      * let the device do this when it initializes itself, otherwise we
1001      * fall back to the old API */
1002     return kvm_check_extension(s, KVM_CAP_DEVICE_CTRL);
1003 }
1004
1005 int kvm_arm_vgic_probe(void)
1006 {
1007     int val = 0;
1008
1009     if (kvm_create_device(kvm_state,
1010                           KVM_DEV_TYPE_ARM_VGIC_V3, true) == 0) {
1011         val |= KVM_ARM_VGIC_V3;
1012     }
1013     if (kvm_create_device(kvm_state,
1014                           KVM_DEV_TYPE_ARM_VGIC_V2, true) == 0) {
1015         val |= KVM_ARM_VGIC_V2;
1016     }
1017     return val;
1018 }
1019
1020 int kvm_arm_set_irq(int cpu, int irqtype, int irq, int level)
1021 {
1022     int kvm_irq = (irqtype << KVM_ARM_IRQ_TYPE_SHIFT) | irq;
1023     int cpu_idx1 = cpu % 256;
1024     int cpu_idx2 = cpu / 256;
1025
1026     kvm_irq |= (cpu_idx1 << KVM_ARM_IRQ_VCPU_SHIFT) |
1027                (cpu_idx2 << KVM_ARM_IRQ_VCPU2_SHIFT);
1028
1029     return kvm_set_irq(kvm_state, kvm_irq, !!level);
1030 }
1031
1032 int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
1033                              uint64_t address, uint32_t data, PCIDevice *dev)
1034 {
1035     AddressSpace *as = pci_device_iommu_address_space(dev);
1036     hwaddr xlat, len, doorbell_gpa;
1037     MemoryRegionSection mrs;
1038     MemoryRegion *mr;
1039
1040     if (as == &address_space_memory) {
1041         return 0;
1042     }
1043
1044     /* MSI doorbell address is translated by an IOMMU */
1045
1046     RCU_READ_LOCK_GUARD();
1047
1048     mr = address_space_translate(as, address, &xlat, &len, true,
1049                                  MEMTXATTRS_UNSPECIFIED);
1050
1051     if (!mr) {
1052         return 1;
1053     }
1054
1055     mrs = memory_region_find(mr, xlat, 1);
1056
1057     if (!mrs.mr) {
1058         return 1;
1059     }
1060
1061     doorbell_gpa = mrs.offset_within_address_space;
1062     memory_region_unref(mrs.mr);
1063
1064     route->u.msi.address_lo = doorbell_gpa;
1065     route->u.msi.address_hi = doorbell_gpa >> 32;
1066
1067     trace_kvm_arm_fixup_msi_route(address, doorbell_gpa);
1068
1069     return 0;
1070 }
1071
1072 int kvm_arch_add_msi_route_post(struct kvm_irq_routing_entry *route,
1073                                 int vector, PCIDevice *dev)
1074 {
1075     return 0;
1076 }
1077
1078 int kvm_arch_release_virq_post(int virq)
1079 {
1080     return 0;
1081 }
1082
1083 int kvm_arch_msi_data_to_gsi(uint32_t data)
1084 {
1085     return (data - 32) & 0xffff;
1086 }
1087
1088 bool kvm_arch_cpu_check_are_resettable(void)
1089 {
1090     return true;
1091 }
1092
1093 static void kvm_arch_get_eager_split_size(Object *obj, Visitor *v,
1094                                           const char *name, void *opaque,
1095                                           Error **errp)
1096 {
1097     KVMState *s = KVM_STATE(obj);
1098     uint64_t value = s->kvm_eager_split_size;
1099
1100     visit_type_size(v, name, &value, errp);
1101 }
1102
1103 static void kvm_arch_set_eager_split_size(Object *obj, Visitor *v,
1104                                           const char *name, void *opaque,
1105                                           Error **errp)
1106 {
1107     KVMState *s = KVM_STATE(obj);
1108     uint64_t value;
1109
1110     if (s->fd != -1) {
1111         error_setg(errp, "Unable to set early-split-size after KVM has been initialized");
1112         return;
1113     }
1114
1115     if (!visit_type_size(v, name, &value, errp)) {
1116         return;
1117     }
1118
1119     if (value && !is_power_of_2(value)) {
1120         error_setg(errp, "early-split-size must be a power of two");
1121         return;
1122     }
1123
1124     s->kvm_eager_split_size = value;
1125 }
1126
1127 void kvm_arch_accel_class_init(ObjectClass *oc)
1128 {
1129     object_class_property_add(oc, "eager-split-size", "size",
1130                               kvm_arch_get_eager_split_size,
1131                               kvm_arch_set_eager_split_size, NULL, NULL);
1132
1133     object_class_property_set_description(oc, "eager-split-size",
1134         "Eager Page Split chunk size for hugepages. (default: 0, disabled)");
1135 }