target/i386/sev.c

   1 /*
   2  * QEMU SEV support
   3  *
   4  * Copyright Advanced Micro Devices 2016-2018
   5  *
   6  * Author:
   7  *      Brijesh Singh <brijesh.singh@amd.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "qemu/osdep.h"
  15
  16 #include <linux/kvm.h>
  17 #include <linux/psp-sev.h>
  18
  19 #include <sys/ioctl.h>
  20
  21 #include "qapi/error.h"
  22 #include "qom/object_interfaces.h"
  23 #include "qemu/base64.h"
  24 #include "qemu/module.h"
  25 #include "qemu/uuid.h"
  26 #include "crypto/hash.h"
  27 #include "sysemu/kvm.h"
  28 #include "sev.h"
  29 #include "sysemu/sysemu.h"
  30 #include "sysemu/runstate.h"
  31 #include "trace.h"
  32 #include "migration/blocker.h"
  33 #include "qom/object.h"
  34 #include "monitor/monitor.h"
  35 #include "monitor/hmp-target.h"
  36 #include "qapi/qapi-commands-misc-target.h"
  37 #include "qapi/qmp/qerror.h"
  38 #include "exec/confidential-guest-support.h"
  39 #include "hw/i386/pc.h"
  40 #include "exec/address-spaces.h"
  41
  42 #define TYPE_SEV_GUEST "sev-guest"
  43 OBJECT_DECLARE_SIMPLE_TYPE(SevGuestState, SEV_GUEST)
  44
  45
  46 /**
  47  * SevGuestState:
  48  *
  49  * The SevGuestState object is used for creating and managing a SEV
  50  * guest.
  51  *
  52  * # $QEMU \
  53  *         -object sev-guest,id=sev0 \
  54  *         -machine ...,memory-encryption=sev0
  55  */
  56 struct SevGuestState {
  57     ConfidentialGuestSupport parent_obj;
  58
  59     /* configuration parameters */
  60     char *sev_device;
  61     uint32_t policy;
  62     char *dh_cert_file;
  63     char *session_file;
  64     uint32_t cbitpos;
  65     uint32_t reduced_phys_bits;
  66     bool kernel_hashes;
  67
  68     /* runtime state */
  69     uint32_t handle;
  70     uint8_t api_major;
  71     uint8_t api_minor;
  72     uint8_t build_id;
  73     int sev_fd;
  74     SevState state;
  75     gchar *measurement;
  76
  77     uint32_t reset_cs;
  78     uint32_t reset_ip;
  79     bool reset_data_valid;
  80 };
  81
  82 #define DEFAULT_GUEST_POLICY    0x1 /* disable debug */
  83 #define DEFAULT_SEV_DEVICE      "/dev/sev"
  84
  85 #define SEV_INFO_BLOCK_GUID     "00f771de-1a7e-4fcb-890e-68c77e2fb44e"
  86 typedef struct __attribute__((__packed__)) SevInfoBlock {
  87     /* SEV-ES Reset Vector Address */
  88     uint32_t reset_addr;
  89 } SevInfoBlock;
  90
  91 #define SEV_HASH_TABLE_RV_GUID  "7255371f-3a3b-4b04-927b-1da6efa8d454"
  92 typedef struct QEMU_PACKED SevHashTableDescriptor {
  93     /* SEV hash table area guest address */
  94     uint32_t base;
  95     /* SEV hash table area size (in bytes) */
  96     uint32_t size;
  97 } SevHashTableDescriptor;
  98
  99 /* hard code sha256 digest size */
 100 #define HASH_SIZE 32
 101
 102 typedef struct QEMU_PACKED SevHashTableEntry {
 103     QemuUUID guid;
 104     uint16_t len;
 105     uint8_t hash[HASH_SIZE];
 106 } SevHashTableEntry;
 107
 108 typedef struct QEMU_PACKED SevHashTable {
 109     QemuUUID guid;
 110     uint16_t len;
 111     SevHashTableEntry cmdline;
 112     SevHashTableEntry initrd;
 113     SevHashTableEntry kernel;
 114 } SevHashTable;
 115
 116 /*
 117  * Data encrypted by sev_encrypt_flash() must be padded to a multiple of
 118  * 16 bytes.
 119  */
 120 typedef struct QEMU_PACKED PaddedSevHashTable {
 121     SevHashTable ht;
 122     uint8_t padding[ROUND_UP(sizeof(SevHashTable), 16) - sizeof(SevHashTable)];
 123 } PaddedSevHashTable;
 124
 125 QEMU_BUILD_BUG_ON(sizeof(PaddedSevHashTable) % 16 != 0);
 126
 127 static SevGuestState *sev_guest;
 128 static Error *sev_mig_blocker;
 129
 130 static const char *const sev_fw_errlist[] = {
 131     [SEV_RET_SUCCESS]                = "",
 132     [SEV_RET_INVALID_PLATFORM_STATE] = "Platform state is invalid",
 133     [SEV_RET_INVALID_GUEST_STATE]    = "Guest state is invalid",
 134     [SEV_RET_INAVLID_CONFIG]         = "Platform configuration is invalid",
 135     [SEV_RET_INVALID_LEN]            = "Buffer too small",
 136     [SEV_RET_ALREADY_OWNED]          = "Platform is already owned",
 137     [SEV_RET_INVALID_CERTIFICATE]    = "Certificate is invalid",
 138     [SEV_RET_POLICY_FAILURE]         = "Policy is not allowed",
 139     [SEV_RET_INACTIVE]               = "Guest is not active",
 140     [SEV_RET_INVALID_ADDRESS]        = "Invalid address",
 141     [SEV_RET_BAD_SIGNATURE]          = "Bad signature",
 142     [SEV_RET_BAD_MEASUREMENT]        = "Bad measurement",
 143     [SEV_RET_ASID_OWNED]             = "ASID is already owned",
 144     [SEV_RET_INVALID_ASID]           = "Invalid ASID",
 145     [SEV_RET_WBINVD_REQUIRED]        = "WBINVD is required",
 146     [SEV_RET_DFFLUSH_REQUIRED]       = "DF_FLUSH is required",
 147     [SEV_RET_INVALID_GUEST]          = "Guest handle is invalid",
 148     [SEV_RET_INVALID_COMMAND]        = "Invalid command",
 149     [SEV_RET_ACTIVE]                 = "Guest is active",
 150     [SEV_RET_HWSEV_RET_PLATFORM]     = "Hardware error",
 151     [SEV_RET_HWSEV_RET_UNSAFE]       = "Hardware unsafe",
 152     [SEV_RET_UNSUPPORTED]            = "Feature not supported",
 153     [SEV_RET_INVALID_PARAM]          = "Invalid parameter",
 154     [SEV_RET_RESOURCE_LIMIT]         = "Required firmware resource depleted",
 155     [SEV_RET_SECURE_DATA_INVALID]    = "Part-specific integrity check failure",
 156 };
 157
 158 #define SEV_FW_MAX_ERROR      ARRAY_SIZE(sev_fw_errlist)
 159
 160 static int
 161 sev_ioctl(int fd, int cmd, void *data, int *error)
 162 {
 163     int r;
 164     struct kvm_sev_cmd input;
 165
 166     memset(&input, 0x0, sizeof(input));
 167
 168     input.id = cmd;
 169     input.sev_fd = fd;
 170     input.data = (__u64)(unsigned long)data;
 171
 172     r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, &input);
 173
 174     if (error) {
 175         *error = input.error;
 176     }
 177
 178     return r;
 179 }
 180
 181 static int
 182 sev_platform_ioctl(int fd, int cmd, void *data, int *error)
 183 {
 184     int r;
 185     struct sev_issue_cmd arg;
 186
 187     arg.cmd = cmd;
 188     arg.data = (unsigned long)data;
 189     r = ioctl(fd, SEV_ISSUE_CMD, &arg);
 190     if (error) {
 191         *error = arg.error;
 192     }
 193
 194     return r;
 195 }
 196
 197 static const char *
 198 fw_error_to_str(int code)
 199 {
 200     if (code < 0 || code >= SEV_FW_MAX_ERROR) {
 201         return "unknown error";
 202     }
 203
 204     return sev_fw_errlist[code];
 205 }
 206
 207 static bool
 208 sev_check_state(const SevGuestState *sev, SevState state)
 209 {
 210     assert(sev);
 211     return sev->state == state ? true : false;
 212 }
 213
 214 static void
 215 sev_set_guest_state(SevGuestState *sev, SevState new_state)
 216 {
 217     assert(new_state < SEV_STATE__MAX);
 218     assert(sev);
 219
 220     trace_kvm_sev_change_state(SevState_str(sev->state),
 221                                SevState_str(new_state));
 222     sev->state = new_state;
 223 }
 224
 225 static void
 226 sev_ram_block_added(RAMBlockNotifier *n, void *host, size_t size,
 227                     size_t max_size)
 228 {
 229     int r;
 230     struct kvm_enc_region range;
 231     ram_addr_t offset;
 232     MemoryRegion *mr;
 233
 234     /*
 235      * The RAM device presents a memory region that should be treated
 236      * as IO region and should not be pinned.
 237      */
 238     mr = memory_region_from_host(host, &offset);
 239     if (mr && memory_region_is_ram_device(mr)) {
 240         return;
 241     }
 242
 243     range.addr = (__u64)(unsigned long)host;
 244     range.size = max_size;
 245
 246     trace_kvm_memcrypt_register_region(host, max_size);
 247     r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_REG_REGION, &range);
 248     if (r) {
 249         error_report("%s: failed to register region (%p+%#zx) error '%s'",
 250                      __func__, host, max_size, strerror(errno));
 251         exit(1);
 252     }
 253 }
 254
 255 static void
 256 sev_ram_block_removed(RAMBlockNotifier *n, void *host, size_t size,
 257                       size_t max_size)
 258 {
 259     int r;
 260     struct kvm_enc_region range;
 261     ram_addr_t offset;
 262     MemoryRegion *mr;
 263
 264     /*
 265      * The RAM device presents a memory region that should be treated
 266      * as IO region and should not have been pinned.
 267      */
 268     mr = memory_region_from_host(host, &offset);
 269     if (mr && memory_region_is_ram_device(mr)) {
 270         return;
 271     }
 272
 273     range.addr = (__u64)(unsigned long)host;
 274     range.size = max_size;
 275
 276     trace_kvm_memcrypt_unregister_region(host, max_size);
 277     r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_UNREG_REGION, &range);
 278     if (r) {
 279         error_report("%s: failed to unregister region (%p+%#zx)",
 280                      __func__, host, max_size);
 281     }
 282 }
 283
 284 static struct RAMBlockNotifier sev_ram_notifier = {
 285     .ram_block_added = sev_ram_block_added,
 286     .ram_block_removed = sev_ram_block_removed,
 287 };
 288
 289 static void
 290 sev_guest_finalize(Object *obj)
 291 {
 292 }
 293
 294 static char *
 295 sev_guest_get_session_file(Object *obj, Error **errp)
 296 {
 297     SevGuestState *s = SEV_GUEST(obj);
 298
 299     return s->session_file ? g_strdup(s->session_file) : NULL;
 300 }
 301
 302 static void
 303 sev_guest_set_session_file(Object *obj, const char *value, Error **errp)
 304 {
 305     SevGuestState *s = SEV_GUEST(obj);
 306
 307     s->session_file = g_strdup(value);
 308 }
 309
 310 static char *
 311 sev_guest_get_dh_cert_file(Object *obj, Error **errp)
 312 {
 313     SevGuestState *s = SEV_GUEST(obj);
 314
 315     return g_strdup(s->dh_cert_file);
 316 }
 317
 318 static void
 319 sev_guest_set_dh_cert_file(Object *obj, const char *value, Error **errp)
 320 {
 321     SevGuestState *s = SEV_GUEST(obj);
 322
 323     s->dh_cert_file = g_strdup(value);
 324 }
 325
 326 static char *
 327 sev_guest_get_sev_device(Object *obj, Error **errp)
 328 {
 329     SevGuestState *sev = SEV_GUEST(obj);
 330
 331     return g_strdup(sev->sev_device);
 332 }
 333
 334 static void
 335 sev_guest_set_sev_device(Object *obj, const char *value, Error **errp)
 336 {
 337     SevGuestState *sev = SEV_GUEST(obj);
 338
 339     sev->sev_device = g_strdup(value);
 340 }
 341
 342 static bool sev_guest_get_kernel_hashes(Object *obj, Error **errp)
 343 {
 344     SevGuestState *sev = SEV_GUEST(obj);
 345
 346     return sev->kernel_hashes;
 347 }
 348
 349 static void sev_guest_set_kernel_hashes(Object *obj, bool value, Error **errp)
 350 {
 351     SevGuestState *sev = SEV_GUEST(obj);
 352
 353     sev->kernel_hashes = value;
 354 }
 355
 356 static void
 357 sev_guest_class_init(ObjectClass *oc, void *data)
 358 {
 359     object_class_property_add_str(oc, "sev-device",
 360                                   sev_guest_get_sev_device,
 361                                   sev_guest_set_sev_device);
 362     object_class_property_set_description(oc, "sev-device",
 363             "SEV device to use");
 364     object_class_property_add_str(oc, "dh-cert-file",
 365                                   sev_guest_get_dh_cert_file,
 366                                   sev_guest_set_dh_cert_file);
 367     object_class_property_set_description(oc, "dh-cert-file",
 368             "guest owners DH certificate (encoded with base64)");
 369     object_class_property_add_str(oc, "session-file",
 370                                   sev_guest_get_session_file,
 371                                   sev_guest_set_session_file);
 372     object_class_property_set_description(oc, "session-file",
 373             "guest owners session parameters (encoded with base64)");
 374     object_class_property_add_bool(oc, "kernel-hashes",
 375                                    sev_guest_get_kernel_hashes,
 376                                    sev_guest_set_kernel_hashes);
 377     object_class_property_set_description(oc, "kernel-hashes",
 378             "add kernel hashes to guest firmware for measured Linux boot");
 379 }
 380
 381 static void
 382 sev_guest_instance_init(Object *obj)
 383 {
 384     SevGuestState *sev = SEV_GUEST(obj);
 385
 386     sev->sev_device = g_strdup(DEFAULT_SEV_DEVICE);
 387     sev->policy = DEFAULT_GUEST_POLICY;
 388     object_property_add_uint32_ptr(obj, "policy", &sev->policy,
 389                                    OBJ_PROP_FLAG_READWRITE);
 390     object_property_add_uint32_ptr(obj, "handle", &sev->handle,
 391                                    OBJ_PROP_FLAG_READWRITE);
 392     object_property_add_uint32_ptr(obj, "cbitpos", &sev->cbitpos,
 393                                    OBJ_PROP_FLAG_READWRITE);
 394     object_property_add_uint32_ptr(obj, "reduced-phys-bits",
 395                                    &sev->reduced_phys_bits,
 396                                    OBJ_PROP_FLAG_READWRITE);
 397 }
 398
 399 /* sev guest info */
 400 static const TypeInfo sev_guest_info = {
 401     .parent = TYPE_CONFIDENTIAL_GUEST_SUPPORT,
 402     .name = TYPE_SEV_GUEST,
 403     .instance_size = sizeof(SevGuestState),
 404     .instance_finalize = sev_guest_finalize,
 405     .class_init = sev_guest_class_init,
 406     .instance_init = sev_guest_instance_init,
 407     .interfaces = (InterfaceInfo[]) {
 408         { TYPE_USER_CREATABLE },
 409         { }
 410     }
 411 };
 412
 413 bool
 414 sev_enabled(void)
 415 {
 416     return !!sev_guest;
 417 }
 418
 419 bool
 420 sev_es_enabled(void)
 421 {
 422     return sev_enabled() && (sev_guest->policy & SEV_POLICY_ES);
 423 }
 424
 425 uint32_t
 426 sev_get_cbit_position(void)
 427 {
 428     return sev_guest ? sev_guest->cbitpos : 0;
 429 }
 430
 431 uint32_t
 432 sev_get_reduced_phys_bits(void)
 433 {
 434     return sev_guest ? sev_guest->reduced_phys_bits : 0;
 435 }
 436
 437 static SevInfo *sev_get_info(void)
 438 {
 439     SevInfo *info;
 440
 441     info = g_new0(SevInfo, 1);
 442     info->enabled = sev_enabled();
 443
 444     if (info->enabled) {
 445         info->api_major = sev_guest->api_major;
 446         info->api_minor = sev_guest->api_minor;
 447         info->build_id = sev_guest->build_id;
 448         info->policy = sev_guest->policy;
 449         info->state = sev_guest->state;
 450         info->handle = sev_guest->handle;
 451     }
 452
 453     return info;
 454 }
 455
 456 SevInfo *qmp_query_sev(Error **errp)
 457 {
 458     SevInfo *info;
 459
 460     info = sev_get_info();
 461     if (!info) {
 462         error_setg(errp, "SEV feature is not available");
 463         return NULL;
 464     }
 465
 466     return info;
 467 }
 468
 469 void hmp_info_sev(Monitor *mon, const QDict *qdict)
 470 {
 471     SevInfo *info = sev_get_info();
 472
 473     if (info && info->enabled) {
 474         monitor_printf(mon, "handle: %d\n", info->handle);
 475         monitor_printf(mon, "state: %s\n", SevState_str(info->state));
 476         monitor_printf(mon, "build: %d\n", info->build_id);
 477         monitor_printf(mon, "api version: %d.%d\n",
 478                        info->api_major, info->api_minor);
 479         monitor_printf(mon, "debug: %s\n",
 480                        info->policy & SEV_POLICY_NODBG ? "off" : "on");
 481         monitor_printf(mon, "key-sharing: %s\n",
 482                        info->policy & SEV_POLICY_NOKS ? "off" : "on");
 483     } else {
 484         monitor_printf(mon, "SEV is not enabled\n");
 485     }
 486
 487     qapi_free_SevInfo(info);
 488 }
 489
 490 static int
 491 sev_get_pdh_info(int fd, guchar **pdh, size_t *pdh_len, guchar **cert_chain,
 492                  size_t *cert_chain_len, Error **errp)
 493 {
 494     guchar *pdh_data = NULL;
 495     guchar *cert_chain_data = NULL;
 496     struct sev_user_data_pdh_cert_export export = {};
 497     int err, r;
 498
 499     /* query the certificate length */
 500     r = sev_platform_ioctl(fd, SEV_PDH_CERT_EXPORT, &export, &err);
 501     if (r < 0) {
 502         if (err != SEV_RET_INVALID_LEN) {
 503             error_setg(errp, "SEV: Failed to export PDH cert"
 504                              " ret=%d fw_err=%d (%s)",
 505                        r, err, fw_error_to_str(err));
 506             return 1;
 507         }
 508     }
 509
 510     pdh_data = g_new(guchar, export.pdh_cert_len);
 511     cert_chain_data = g_new(guchar, export.cert_chain_len);
 512     export.pdh_cert_address = (unsigned long)pdh_data;
 513     export.cert_chain_address = (unsigned long)cert_chain_data;
 514
 515     r = sev_platform_ioctl(fd, SEV_PDH_CERT_EXPORT, &export, &err);
 516     if (r < 0) {
 517         error_setg(errp, "SEV: Failed to export PDH cert ret=%d fw_err=%d (%s)",
 518                    r, err, fw_error_to_str(err));
 519         goto e_free;
 520     }
 521
 522     *pdh = pdh_data;
 523     *pdh_len = export.pdh_cert_len;
 524     *cert_chain = cert_chain_data;
 525     *cert_chain_len = export.cert_chain_len;
 526     return 0;
 527
 528 e_free:
 529     g_free(pdh_data);
 530     g_free(cert_chain_data);
 531     return 1;
 532 }
 533
 534 static int sev_get_cpu0_id(int fd, guchar **id, size_t *id_len, Error **errp)
 535 {
 536     guchar *id_data;
 537     struct sev_user_data_get_id2 get_id2 = {};
 538     int err, r;
 539
 540     /* query the ID length */
 541     r = sev_platform_ioctl(fd, SEV_GET_ID2, &get_id2, &err);
 542     if (r < 0 && err != SEV_RET_INVALID_LEN) {
 543         error_setg(errp, "SEV: Failed to get ID ret=%d fw_err=%d (%s)",
 544                    r, err, fw_error_to_str(err));
 545         return 1;
 546     }
 547
 548     id_data = g_new(guchar, get_id2.length);
 549     get_id2.address = (unsigned long)id_data;
 550
 551     r = sev_platform_ioctl(fd, SEV_GET_ID2, &get_id2, &err);
 552     if (r < 0) {
 553         error_setg(errp, "SEV: Failed to get ID ret=%d fw_err=%d (%s)",
 554                    r, err, fw_error_to_str(err));
 555         goto err;
 556     }
 557
 558     *id = id_data;
 559     *id_len = get_id2.length;
 560     return 0;
 561
 562 err:
 563     g_free(id_data);
 564     return 1;
 565 }
 566
 567 static SevCapability *sev_get_capabilities(Error **errp)
 568 {
 569     SevCapability *cap = NULL;
 570     guchar *pdh_data = NULL;
 571     guchar *cert_chain_data = NULL;
 572     guchar *cpu0_id_data = NULL;
 573     size_t pdh_len = 0, cert_chain_len = 0, cpu0_id_len = 0;
 574     uint32_t ebx;
 575     int fd;
 576
 577     if (!kvm_enabled()) {
 578         error_setg(errp, "KVM not enabled");
 579         return NULL;
 580     }
 581     if (kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, NULL) < 0) {
 582         error_setg(errp, "SEV is not enabled in KVM");
 583         return NULL;
 584     }
 585
 586     fd = open(DEFAULT_SEV_DEVICE, O_RDWR);
 587     if (fd < 0) {
 588         error_setg_errno(errp, errno, "SEV: Failed to open %s",
 589                          DEFAULT_SEV_DEVICE);
 590         return NULL;
 591     }
 592
 593     if (sev_get_pdh_info(fd, &pdh_data, &pdh_len,
 594                          &cert_chain_data, &cert_chain_len, errp)) {
 595         goto out;
 596     }
 597
 598     if (sev_get_cpu0_id(fd, &cpu0_id_data, &cpu0_id_len, errp)) {
 599         goto out;
 600     }
 601
 602     cap = g_new0(SevCapability, 1);
 603     cap->pdh = g_base64_encode(pdh_data, pdh_len);
 604     cap->cert_chain = g_base64_encode(cert_chain_data, cert_chain_len);
 605     cap->cpu0_id = g_base64_encode(cpu0_id_data, cpu0_id_len);
 606
 607     host_cpuid(0x8000001F, 0, NULL, &ebx, NULL, NULL);
 608     cap->cbitpos = ebx & 0x3f;
 609
 610     /*
 611      * When SEV feature is enabled, we loose one bit in guest physical
 612      * addressing.
 613      */
 614     cap->reduced_phys_bits = 1;
 615
 616 out:
 617     g_free(cpu0_id_data);
 618     g_free(pdh_data);
 619     g_free(cert_chain_data);
 620     close(fd);
 621     return cap;
 622 }
 623
 624 SevCapability *qmp_query_sev_capabilities(Error **errp)
 625 {
 626     return sev_get_capabilities(errp);
 627 }
 628
 629 static SevAttestationReport *sev_get_attestation_report(const char *mnonce,
 630                                                         Error **errp)
 631 {
 632     struct kvm_sev_attestation_report input = {};
 633     SevAttestationReport *report = NULL;
 634     SevGuestState *sev = sev_guest;
 635     g_autofree guchar *data = NULL;
 636     g_autofree guchar *buf = NULL;
 637     gsize len;
 638     int err = 0, ret;
 639
 640     if (!sev_enabled()) {
 641         error_setg(errp, "SEV is not enabled");
 642         return NULL;
 643     }
 644
 645     /* lets decode the mnonce string */
 646     buf = g_base64_decode(mnonce, &len);
 647     if (!buf) {
 648         error_setg(errp, "SEV: failed to decode mnonce input");
 649         return NULL;
 650     }
 651
 652     /* verify the input mnonce length */
 653     if (len != sizeof(input.mnonce)) {
 654         error_setg(errp, "SEV: mnonce must be %zu bytes (got %" G_GSIZE_FORMAT ")",
 655                 sizeof(input.mnonce), len);
 656         return NULL;
 657     }
 658
 659     /* Query the report length */
 660     ret = sev_ioctl(sev->sev_fd, KVM_SEV_GET_ATTESTATION_REPORT,
 661             &input, &err);
 662     if (ret < 0) {
 663         if (err != SEV_RET_INVALID_LEN) {
 664             error_setg(errp, "SEV: Failed to query the attestation report"
 665                              " length ret=%d fw_err=%d (%s)",
 666                        ret, err, fw_error_to_str(err));
 667             return NULL;
 668         }
 669     }
 670
 671     data = g_malloc(input.len);
 672     input.uaddr = (unsigned long)data;
 673     memcpy(input.mnonce, buf, sizeof(input.mnonce));
 674
 675     /* Query the report */
 676     ret = sev_ioctl(sev->sev_fd, KVM_SEV_GET_ATTESTATION_REPORT,
 677             &input, &err);
 678     if (ret) {
 679         error_setg_errno(errp, errno, "SEV: Failed to get attestation report"
 680                 " ret=%d fw_err=%d (%s)", ret, err, fw_error_to_str(err));
 681         return NULL;
 682     }
 683
 684     report = g_new0(SevAttestationReport, 1);
 685     report->data = g_base64_encode(data, input.len);
 686
 687     trace_kvm_sev_attestation_report(mnonce, report->data);
 688
 689     return report;
 690 }
 691
 692 SevAttestationReport *qmp_query_sev_attestation_report(const char *mnonce,
 693                                                        Error **errp)
 694 {
 695     return sev_get_attestation_report(mnonce, errp);
 696 }
 697
 698 static int
 699 sev_read_file_base64(const char *filename, guchar **data, gsize *len)
 700 {
 701     gsize sz;
 702     g_autofree gchar *base64 = NULL;
 703     GError *error = NULL;
 704
 705     if (!g_file_get_contents(filename, &base64, &sz, &error)) {
 706         error_report("SEV: Failed to read '%s' (%s)", filename, error->message);
 707         g_error_free(error);
 708         return -1;
 709     }
 710
 711     *data = g_base64_decode(base64, len);
 712     return 0;
 713 }
 714
 715 static int
 716 sev_launch_start(SevGuestState *sev)
 717 {
 718     gsize sz;
 719     int ret = 1;
 720     int fw_error, rc;
 721     struct kvm_sev_launch_start start = {
 722         .handle = sev->handle, .policy = sev->policy
 723     };
 724     guchar *session = NULL, *dh_cert = NULL;
 725
 726     if (sev->session_file) {
 727         if (sev_read_file_base64(sev->session_file, &session, &sz) < 0) {
 728             goto out;
 729         }
 730         start.session_uaddr = (unsigned long)session;
 731         start.session_len = sz;
 732     }
 733
 734     if (sev->dh_cert_file) {
 735         if (sev_read_file_base64(sev->dh_cert_file, &dh_cert, &sz) < 0) {
 736             goto out;
 737         }
 738         start.dh_uaddr = (unsigned long)dh_cert;
 739         start.dh_len = sz;
 740     }
 741
 742     trace_kvm_sev_launch_start(start.policy, session, dh_cert);
 743     rc = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_START, &start, &fw_error);
 744     if (rc < 0) {
 745         error_report("%s: LAUNCH_START ret=%d fw_error=%d '%s'",
 746                 __func__, ret, fw_error, fw_error_to_str(fw_error));
 747         goto out;
 748     }
 749
 750     sev_set_guest_state(sev, SEV_STATE_LAUNCH_UPDATE);
 751     sev->handle = start.handle;
 752     ret = 0;
 753
 754 out:
 755     g_free(session);
 756     g_free(dh_cert);
 757     return ret;
 758 }
 759
 760 static int
 761 sev_launch_update_data(SevGuestState *sev, uint8_t *addr, uint64_t len)
 762 {
 763     int ret, fw_error;
 764     struct kvm_sev_launch_update_data update;
 765
 766     if (!addr || !len) {
 767         return 1;
 768     }
 769
 770     update.uaddr = (__u64)(unsigned long)addr;
 771     update.len = len;
 772     trace_kvm_sev_launch_update_data(addr, len);
 773     ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_UPDATE_DATA,
 774                     &update, &fw_error);
 775     if (ret) {
 776         error_report("%s: LAUNCH_UPDATE ret=%d fw_error=%d '%s'",
 777                 __func__, ret, fw_error, fw_error_to_str(fw_error));
 778     }
 779
 780     return ret;
 781 }
 782
 783 static int
 784 sev_launch_update_vmsa(SevGuestState *sev)
 785 {
 786     int ret, fw_error;
 787
 788     ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL, &fw_error);
 789     if (ret) {
 790         error_report("%s: LAUNCH_UPDATE_VMSA ret=%d fw_error=%d '%s'",
 791                 __func__, ret, fw_error, fw_error_to_str(fw_error));
 792     }
 793
 794     return ret;
 795 }
 796
 797 static void
 798 sev_launch_get_measure(Notifier *notifier, void *unused)
 799 {
 800     SevGuestState *sev = sev_guest;
 801     int ret, error;
 802     g_autofree guchar *data = NULL;
 803     struct kvm_sev_launch_measure measurement = {};
 804
 805     if (!sev_check_state(sev, SEV_STATE_LAUNCH_UPDATE)) {
 806         return;
 807     }
 808
 809     if (sev_es_enabled()) {
 810         /* measure all the VM save areas before getting launch_measure */
 811         ret = sev_launch_update_vmsa(sev);
 812         if (ret) {
 813             exit(1);
 814         }
 815     }
 816
 817     /* query the measurement blob length */
 818     ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
 819                     &measurement, &error);
 820     if (!measurement.len) {
 821         error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
 822                      __func__, ret, error, fw_error_to_str(errno));
 823         return;
 824     }
 825
 826     data = g_new0(guchar, measurement.len);
 827     measurement.uaddr = (unsigned long)data;
 828
 829     /* get the measurement blob */
 830     ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
 831                     &measurement, &error);
 832     if (ret) {
 833         error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
 834                      __func__, ret, error, fw_error_to_str(errno));
 835         return;
 836     }
 837
 838     sev_set_guest_state(sev, SEV_STATE_LAUNCH_SECRET);
 839
 840     /* encode the measurement value and emit the event */
 841     sev->measurement = g_base64_encode(data, measurement.len);
 842     trace_kvm_sev_launch_measurement(sev->measurement);
 843 }
 844
 845 static char *sev_get_launch_measurement(void)
 846 {
 847     if (sev_guest &&
 848         sev_guest->state >= SEV_STATE_LAUNCH_SECRET) {
 849         return g_strdup(sev_guest->measurement);
 850     }
 851
 852     return NULL;
 853 }
 854
 855 SevLaunchMeasureInfo *qmp_query_sev_launch_measure(Error **errp)
 856 {
 857     char *data;
 858     SevLaunchMeasureInfo *info;
 859
 860     data = sev_get_launch_measurement();
 861     if (!data) {
 862         error_setg(errp, "SEV launch measurement is not available");
 863         return NULL;
 864     }
 865
 866     info = g_malloc0(sizeof(*info));
 867     info->data = data;
 868
 869     return info;
 870 }
 871
 872 static Notifier sev_machine_done_notify = {
 873     .notify = sev_launch_get_measure,
 874 };
 875
 876 static void
 877 sev_launch_finish(SevGuestState *sev)
 878 {
 879     int ret, error;
 880
 881     trace_kvm_sev_launch_finish();
 882     ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_FINISH, 0, &error);
 883     if (ret) {
 884         error_report("%s: LAUNCH_FINISH ret=%d fw_error=%d '%s'",
 885                      __func__, ret, error, fw_error_to_str(error));
 886         exit(1);
 887     }
 888
 889     sev_set_guest_state(sev, SEV_STATE_RUNNING);
 890
 891     /* add migration blocker */
 892     error_setg(&sev_mig_blocker,
 893                "SEV: Migration is not implemented");
 894     migrate_add_blocker(sev_mig_blocker, &error_fatal);
 895 }
 896
 897 static void
 898 sev_vm_state_change(void *opaque, bool running, RunState state)
 899 {
 900     SevGuestState *sev = opaque;
 901
 902     if (running) {
 903         if (!sev_check_state(sev, SEV_STATE_RUNNING)) {
 904             sev_launch_finish(sev);
 905         }
 906     }
 907 }
 908
 909 int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
 910 {
 911     SevGuestState *sev
 912         = (SevGuestState *)object_dynamic_cast(OBJECT(cgs), TYPE_SEV_GUEST);
 913     char *devname;
 914     int ret, fw_error, cmd;
 915     uint32_t ebx;
 916     uint32_t host_cbitpos;
 917     struct sev_user_data_status status = {};
 918
 919     if (!sev) {
 920         return 0;
 921     }
 922
 923     ret = ram_block_discard_disable(true);
 924     if (ret) {
 925         error_report("%s: cannot disable RAM discard", __func__);
 926         return -1;
 927     }
 928
 929     sev_guest = sev;
 930     sev->state = SEV_STATE_UNINIT;
 931
 932     host_cpuid(0x8000001F, 0, NULL, &ebx, NULL, NULL);
 933     host_cbitpos = ebx & 0x3f;
 934
 935     if (host_cbitpos != sev->cbitpos) {
 936         error_setg(errp, "%s: cbitpos check failed, host '%d' requested '%d'",
 937                    __func__, host_cbitpos, sev->cbitpos);
 938         goto err;
 939     }
 940
 941     if (sev->reduced_phys_bits < 1) {
 942         error_setg(errp, "%s: reduced_phys_bits check failed, it should be >=1,"
 943                    " requested '%d'", __func__, sev->reduced_phys_bits);
 944         goto err;
 945     }
 946
 947     devname = object_property_get_str(OBJECT(sev), "sev-device", NULL);
 948     sev->sev_fd = open(devname, O_RDWR);
 949     if (sev->sev_fd < 0) {
 950         error_setg(errp, "%s: Failed to open %s '%s'", __func__,
 951                    devname, strerror(errno));
 952         g_free(devname);
 953         goto err;
 954     }
 955     g_free(devname);
 956
 957     ret = sev_platform_ioctl(sev->sev_fd, SEV_PLATFORM_STATUS, &status,
 958                              &fw_error);
 959     if (ret) {
 960         error_setg(errp, "%s: failed to get platform status ret=%d "
 961                    "fw_error='%d: %s'", __func__, ret, fw_error,
 962                    fw_error_to_str(fw_error));
 963         goto err;
 964     }
 965     sev->build_id = status.build;
 966     sev->api_major = status.api_major;
 967     sev->api_minor = status.api_minor;
 968
 969     if (sev_es_enabled()) {
 970         if (!kvm_kernel_irqchip_allowed()) {
 971             error_report("%s: SEV-ES guests require in-kernel irqchip support",
 972                          __func__);
 973             goto err;
 974         }
 975
 976         if (!(status.flags & SEV_STATUS_FLAGS_CONFIG_ES)) {
 977             error_report("%s: guest policy requires SEV-ES, but "
 978                          "host SEV-ES support unavailable",
 979                          __func__);
 980             goto err;
 981         }
 982         cmd = KVM_SEV_ES_INIT;
 983     } else {
 984         cmd = KVM_SEV_INIT;
 985     }
 986
 987     trace_kvm_sev_init();
 988     ret = sev_ioctl(sev->sev_fd, cmd, NULL, &fw_error);
 989     if (ret) {
 990         error_setg(errp, "%s: failed to initialize ret=%d fw_error=%d '%s'",
 991                    __func__, ret, fw_error, fw_error_to_str(fw_error));
 992         goto err;
 993     }
 994
 995     ret = sev_launch_start(sev);
 996     if (ret) {
 997         error_setg(errp, "%s: failed to create encryption context", __func__);
 998         goto err;
 999     }
1000
1001     ram_block_notifier_add(&sev_ram_notifier);
1002     qemu_add_machine_init_done_notifier(&sev_machine_done_notify);
1003     qemu_add_vm_change_state_handler(sev_vm_state_change, sev);
1004
1005     cgs->ready = true;
1006
1007     return 0;
1008 err:
1009     sev_guest = NULL;
1010     ram_block_discard_disable(false);
1011     return -1;
1012 }
1013
1014 int
1015 sev_encrypt_flash(uint8_t *ptr, uint64_t len, Error **errp)
1016 {
1017     if (!sev_guest) {
1018         return 0;
1019     }
1020
1021     /* if SEV is in update state then encrypt the data else do nothing */
1022     if (sev_check_state(sev_guest, SEV_STATE_LAUNCH_UPDATE)) {
1023         int ret = sev_launch_update_data(sev_guest, ptr, len);
1024         if (ret < 0) {
1025             error_setg(errp, "SEV: Failed to encrypt pflash rom");
1026             return ret;
1027         }
1028     }
1029
1030     return 0;
1031 }
1032
1033 int sev_inject_launch_secret(const char *packet_hdr, const char *secret,
1034                              uint64_t gpa, Error **errp)
1035 {
1036     struct kvm_sev_launch_secret input;
1037     g_autofree guchar *data = NULL, *hdr = NULL;
1038     int error, ret = 1;
1039     void *hva;
1040     gsize hdr_sz = 0, data_sz = 0;
1041     MemoryRegion *mr = NULL;
1042
1043     if (!sev_guest) {
1044         error_setg(errp, "SEV not enabled for guest");
1045         return 1;
1046     }
1047
1048     /* secret can be injected only in this state */
1049     if (!sev_check_state(sev_guest, SEV_STATE_LAUNCH_SECRET)) {
1050         error_setg(errp, "SEV: Not in correct state. (LSECRET) %x",
1051                      sev_guest->state);
1052         return 1;
1053     }
1054
1055     hdr = g_base64_decode(packet_hdr, &hdr_sz);
1056     if (!hdr || !hdr_sz) {
1057         error_setg(errp, "SEV: Failed to decode sequence header");
1058         return 1;
1059     }
1060
1061     data = g_base64_decode(secret, &data_sz);
1062     if (!data || !data_sz) {
1063         error_setg(errp, "SEV: Failed to decode data");
1064         return 1;
1065     }
1066
1067     hva = gpa2hva(&mr, gpa, data_sz, errp);
1068     if (!hva) {
1069         error_prepend(errp, "SEV: Failed to calculate guest address: ");
1070         return 1;
1071     }
1072
1073     input.hdr_uaddr = (uint64_t)(unsigned long)hdr;
1074     input.hdr_len = hdr_sz;
1075
1076     input.trans_uaddr = (uint64_t)(unsigned long)data;
1077     input.trans_len = data_sz;
1078
1079     input.guest_uaddr = (uint64_t)(unsigned long)hva;
1080     input.guest_len = data_sz;
1081
1082     trace_kvm_sev_launch_secret(gpa, input.guest_uaddr,
1083                                 input.trans_uaddr, input.trans_len);
1084
1085     ret = sev_ioctl(sev_guest->sev_fd, KVM_SEV_LAUNCH_SECRET,
1086                     &input, &error);
1087     if (ret) {
1088         error_setg(errp, "SEV: failed to inject secret ret=%d fw_error=%d '%s'",
1089                      ret, error, fw_error_to_str(error));
1090         return ret;
1091     }
1092
1093     return 0;
1094 }
1095
1096 #define SEV_SECRET_GUID "4c2eb361-7d9b-4cc3-8081-127c90d3d294"
1097 struct sev_secret_area {
1098     uint32_t base;
1099     uint32_t size;
1100 };
1101
1102 void qmp_sev_inject_launch_secret(const char *packet_hdr,
1103                                   const char *secret,
1104                                   bool has_gpa, uint64_t gpa,
1105                                   Error **errp)
1106 {
1107     if (!sev_enabled()) {
1108         error_setg(errp, "SEV not enabled for guest");
1109         return;
1110     }
1111     if (!has_gpa) {
1112         uint8_t *data;
1113         struct sev_secret_area *area;
1114
1115         if (!pc_system_ovmf_table_find(SEV_SECRET_GUID, &data, NULL)) {
1116             error_setg(errp, "SEV: no secret area found in OVMF,"
1117                        " gpa must be specified.");
1118             return;
1119         }
1120         area = (struct sev_secret_area *)data;
1121         gpa = area->base;
1122     }
1123
1124     sev_inject_launch_secret(packet_hdr, secret, gpa, errp);
1125 }
1126
1127 static int
1128 sev_es_parse_reset_block(SevInfoBlock *info, uint32_t *addr)
1129 {
1130     if (!info->reset_addr) {
1131         error_report("SEV-ES reset address is zero");
1132         return 1;
1133     }
1134
1135     *addr = info->reset_addr;
1136
1137     return 0;
1138 }
1139
1140 static int
1141 sev_es_find_reset_vector(void *flash_ptr, uint64_t flash_size,
1142                          uint32_t *addr)
1143 {
1144     QemuUUID info_guid, *guid;
1145     SevInfoBlock *info;
1146     uint8_t *data;
1147     uint16_t *len;
1148
1149     /*
1150      * Initialize the address to zero. An address of zero with a successful
1151      * return code indicates that SEV-ES is not active.
1152      */
1153     *addr = 0;
1154
1155     /*
1156      * Extract the AP reset vector for SEV-ES guests by locating the SEV GUID.
1157      * The SEV GUID is located on its own (original implementation) or within
1158      * the Firmware GUID Table (new implementation), either of which are
1159      * located 32 bytes from the end of the flash.
1160      *
1161      * Check the Firmware GUID Table first.
1162      */
1163     if (pc_system_ovmf_table_find(SEV_INFO_BLOCK_GUID, &data, NULL)) {
1164         return sev_es_parse_reset_block((SevInfoBlock *)data, addr);
1165     }
1166
1167     /*
1168      * SEV info block not found in the Firmware GUID Table (or there isn't
1169      * a Firmware GUID Table), fall back to the original implementation.
1170      */
1171     data = flash_ptr + flash_size - 0x20;
1172
1173     qemu_uuid_parse(SEV_INFO_BLOCK_GUID, &info_guid);
1174     info_guid = qemu_uuid_bswap(info_guid); /* GUIDs are LE */
1175
1176     guid = (QemuUUID *)(data - sizeof(info_guid));
1177     if (!qemu_uuid_is_equal(guid, &info_guid)) {
1178         error_report("SEV information block/Firmware GUID Table block not found in pflash rom");
1179         return 1;
1180     }
1181
1182     len = (uint16_t *)((uint8_t *)guid - sizeof(*len));
1183     info = (SevInfoBlock *)(data - le16_to_cpu(*len));
1184
1185     return sev_es_parse_reset_block(info, addr);
1186 }
1187
1188 void sev_es_set_reset_vector(CPUState *cpu)
1189 {
1190     X86CPU *x86;
1191     CPUX86State *env;
1192
1193     /* Only update if we have valid reset information */
1194     if (!sev_guest || !sev_guest->reset_data_valid) {
1195         return;
1196     }
1197
1198     /* Do not update the BSP reset state */
1199     if (cpu->cpu_index == 0) {
1200         return;
1201     }
1202
1203     x86 = X86_CPU(cpu);
1204     env = &x86->env;
1205
1206     cpu_x86_load_seg_cache(env, R_CS, 0xf000, sev_guest->reset_cs, 0xffff,
1207                            DESC_P_MASK | DESC_S_MASK | DESC_CS_MASK |
1208                            DESC_R_MASK | DESC_A_MASK);
1209
1210     env->eip = sev_guest->reset_ip;
1211 }
1212
1213 int sev_es_save_reset_vector(void *flash_ptr, uint64_t flash_size)
1214 {
1215     CPUState *cpu;
1216     uint32_t addr;
1217     int ret;
1218
1219     if (!sev_es_enabled()) {
1220         return 0;
1221     }
1222
1223     addr = 0;
1224     ret = sev_es_find_reset_vector(flash_ptr, flash_size,
1225                                    &addr);
1226     if (ret) {
1227         return ret;
1228     }
1229
1230     if (addr) {
1231         sev_guest->reset_cs = addr & 0xffff0000;
1232         sev_guest->reset_ip = addr & 0x0000ffff;
1233         sev_guest->reset_data_valid = true;
1234
1235         CPU_FOREACH(cpu) {
1236             sev_es_set_reset_vector(cpu);
1237         }
1238     }
1239
1240     return 0;
1241 }
1242
1243 static const QemuUUID sev_hash_table_header_guid = {
1244     .data = UUID_LE(0x9438d606, 0x4f22, 0x4cc9, 0xb4, 0x79, 0xa7, 0x93,
1245                     0xd4, 0x11, 0xfd, 0x21)
1246 };
1247
1248 static const QemuUUID sev_kernel_entry_guid = {
1249     .data = UUID_LE(0x4de79437, 0xabd2, 0x427f, 0xb8, 0x35, 0xd5, 0xb1,
1250                     0x72, 0xd2, 0x04, 0x5b)
1251 };
1252 static const QemuUUID sev_initrd_entry_guid = {
1253     .data = UUID_LE(0x44baf731, 0x3a2f, 0x4bd7, 0x9a, 0xf1, 0x41, 0xe2,
1254                     0x91, 0x69, 0x78, 0x1d)
1255 };
1256 static const QemuUUID sev_cmdline_entry_guid = {
1257     .data = UUID_LE(0x97d02dd8, 0xbd20, 0x4c94, 0xaa, 0x78, 0xe7, 0x71,
1258                     0x4d, 0x36, 0xab, 0x2a)
1259 };
1260
1261 /*
1262  * Add the hashes of the linux kernel/initrd/cmdline to an encrypted guest page
1263  * which is included in SEV's initial memory measurement.
1264  */
1265 bool sev_add_kernel_loader_hashes(SevKernelLoaderContext *ctx, Error **errp)
1266 {
1267     uint8_t *data;
1268     SevHashTableDescriptor *area;
1269     SevHashTable *ht;
1270     PaddedSevHashTable *padded_ht;
1271     uint8_t cmdline_hash[HASH_SIZE];
1272     uint8_t initrd_hash[HASH_SIZE];
1273     uint8_t kernel_hash[HASH_SIZE];
1274     uint8_t *hashp;
1275     size_t hash_len = HASH_SIZE;
1276     hwaddr mapped_len = sizeof(*padded_ht);
1277     MemTxAttrs attrs = { 0 };
1278     bool ret = true;
1279
1280     /*
1281      * Only add the kernel hashes if the sev-guest configuration explicitly
1282      * stated kernel-hashes=on.
1283      */
1284     if (!sev_guest->kernel_hashes) {
1285         return false;
1286     }
1287
1288     if (!pc_system_ovmf_table_find(SEV_HASH_TABLE_RV_GUID, &data, NULL)) {
1289         error_setg(errp, "SEV: kernel specified but guest firmware "
1290                          "has no hashes table GUID");
1291         return false;
1292     }
1293     area = (SevHashTableDescriptor *)data;
1294     if (!area->base || area->size < sizeof(PaddedSevHashTable)) {
1295         error_setg(errp, "SEV: guest firmware hashes table area is invalid "
1296                          "(base=0x%x size=0x%x)", area->base, area->size);
1297         return false;
1298     }
1299
1300     /*
1301      * Calculate hash of kernel command-line with the terminating null byte. If
1302      * the user doesn't supply a command-line via -append, the 1-byte "\0" will
1303      * be used.
1304      */
1305     hashp = cmdline_hash;
1306     if (qcrypto_hash_bytes(QCRYPTO_HASH_ALG_SHA256, ctx->cmdline_data,
1307                            ctx->cmdline_size, &hashp, &hash_len, errp) < 0) {
1308         return false;
1309     }
1310     assert(hash_len == HASH_SIZE);
1311
1312     /*
1313      * Calculate hash of initrd. If the user doesn't supply an initrd via
1314      * -initrd, an empty buffer will be used (ctx->initrd_size == 0).
1315      */
1316     hashp = initrd_hash;
1317     if (qcrypto_hash_bytes(QCRYPTO_HASH_ALG_SHA256, ctx->initrd_data,
1318                            ctx->initrd_size, &hashp, &hash_len, errp) < 0) {
1319         return false;
1320     }
1321     assert(hash_len == HASH_SIZE);
1322
1323     /* Calculate hash of the kernel */
1324     hashp = kernel_hash;
1325     struct iovec iov[2] = {
1326         { .iov_base = ctx->setup_data, .iov_len = ctx->setup_size },
1327         { .iov_base = ctx->kernel_data, .iov_len = ctx->kernel_size }
1328     };
1329     if (qcrypto_hash_bytesv(QCRYPTO_HASH_ALG_SHA256, iov, ARRAY_SIZE(iov),
1330                             &hashp, &hash_len, errp) < 0) {
1331         return false;
1332     }
1333     assert(hash_len == HASH_SIZE);
1334
1335     /*
1336      * Populate the hashes table in the guest's memory at the OVMF-designated
1337      * area for the SEV hashes table
1338      */
1339     padded_ht = address_space_map(&address_space_memory, area->base,
1340                                   &mapped_len, true, attrs);
1341     if (!padded_ht || mapped_len != sizeof(*padded_ht)) {
1342         error_setg(errp, "SEV: cannot map hashes table guest memory area");
1343         return false;
1344     }
1345     ht = &padded_ht->ht;
1346
1347     ht->guid = sev_hash_table_header_guid;
1348     ht->len = sizeof(*ht);
1349
1350     ht->cmdline.guid = sev_cmdline_entry_guid;
1351     ht->cmdline.len = sizeof(ht->cmdline);
1352     memcpy(ht->cmdline.hash, cmdline_hash, sizeof(ht->cmdline.hash));
1353
1354     ht->initrd.guid = sev_initrd_entry_guid;
1355     ht->initrd.len = sizeof(ht->initrd);
1356     memcpy(ht->initrd.hash, initrd_hash, sizeof(ht->initrd.hash));
1357
1358     ht->kernel.guid = sev_kernel_entry_guid;
1359     ht->kernel.len = sizeof(ht->kernel);
1360     memcpy(ht->kernel.hash, kernel_hash, sizeof(ht->kernel.hash));
1361
1362     /* zero the excess data so the measurement can be reliably calculated */
1363     memset(padded_ht->padding, 0, sizeof(padded_ht->padding));
1364
1365     if (sev_encrypt_flash((uint8_t *)padded_ht, sizeof(*padded_ht), errp) < 0) {
1366         ret = false;
1367     }
1368
1369     address_space_unmap(&address_space_memory, padded_ht,
1370                         mapped_len, true, mapped_len);
1371
1372     return ret;
1373 }
1374
1375 static void
1376 sev_register_types(void)
1377 {
1378     type_register_static(&sev_guest_info);
1379 }
1380
1381 type_init(sev_register_types);