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