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 "sysemu/kvm.h"
  26 #include "sev_i386.h"
  27 #include "sysemu/sysemu.h"
  28 #include "sysemu/runstate.h"
  29 #include "trace.h"
  30 #include "migration/blocker.h"
  31
  32 #define TYPE_SEV_GUEST "sev-guest"
  33 #define SEV_GUEST(obj)                                          \
  34     OBJECT_CHECK(SevGuestState, (obj), TYPE_SEV_GUEST)
  35
  36 typedef struct SevGuestState SevGuestState;
  37
  38 /**
  39  * SevGuestState:
  40  *
  41  * The SevGuestState object is used for creating and managing a SEV
  42  * guest.
  43  *
  44  * # $QEMU \
  45  *         -object sev-guest,id=sev0 \
  46  *         -machine ...,memory-encryption=sev0
  47  */
  48 struct SevGuestState {
  49     Object parent_obj;
  50
  51     /* configuration parameters */
  52     char *sev_device;
  53     uint32_t policy;
  54     char *dh_cert_file;
  55     char *session_file;
  56     uint32_t cbitpos;
  57     uint32_t reduced_phys_bits;
  58
  59     /* runtime state */
  60     uint32_t handle;
  61     uint8_t api_major;
  62     uint8_t api_minor;
  63     uint8_t build_id;
  64     uint64_t me_mask;
  65     int sev_fd;
  66     SevState state;
  67     gchar *measurement;
  68 };
  69
  70 #define DEFAULT_GUEST_POLICY    0x1 /* disable debug */
  71 #define DEFAULT_SEV_DEVICE      "/dev/sev"
  72
  73 static SevGuestState *sev_guest;
  74 static Error *sev_mig_blocker;
  75
  76 static const char *const sev_fw_errlist[] = {
  77     "",
  78     "Platform state is invalid",
  79     "Guest state is invalid",
  80     "Platform configuration is invalid",
  81     "Buffer too small",
  82     "Platform is already owned",
  83     "Certificate is invalid",
  84     "Policy is not allowed",
  85     "Guest is not active",
  86     "Invalid address",
  87     "Bad signature",
  88     "Bad measurement",
  89     "Asid is already owned",
  90     "Invalid ASID",
  91     "WBINVD is required",
  92     "DF_FLUSH is required",
  93     "Guest handle is invalid",
  94     "Invalid command",
  95     "Guest is active",
  96     "Hardware error",
  97     "Hardware unsafe",
  98     "Feature not supported",
  99     "Invalid parameter"
 100 };
 101
 102 #define SEV_FW_MAX_ERROR      ARRAY_SIZE(sev_fw_errlist)
 103
 104 static int
 105 sev_ioctl(int fd, int cmd, void *data, int *error)
 106 {
 107     int r;
 108     struct kvm_sev_cmd input;
 109
 110     memset(&input, 0x0, sizeof(input));
 111
 112     input.id = cmd;
 113     input.sev_fd = fd;
 114     input.data = (__u64)(unsigned long)data;
 115
 116     r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, &input);
 117
 118     if (error) {
 119         *error = input.error;
 120     }
 121
 122     return r;
 123 }
 124
 125 static int
 126 sev_platform_ioctl(int fd, int cmd, void *data, int *error)
 127 {
 128     int r;
 129     struct sev_issue_cmd arg;
 130
 131     arg.cmd = cmd;
 132     arg.data = (unsigned long)data;
 133     r = ioctl(fd, SEV_ISSUE_CMD, &arg);
 134     if (error) {
 135         *error = arg.error;
 136     }
 137
 138     return r;
 139 }
 140
 141 static const char *
 142 fw_error_to_str(int code)
 143 {
 144     if (code < 0 || code >= SEV_FW_MAX_ERROR) {
 145         return "unknown error";
 146     }
 147
 148     return sev_fw_errlist[code];
 149 }
 150
 151 static bool
 152 sev_check_state(const SevGuestState *sev, SevState state)
 153 {
 154     assert(sev);
 155     return sev->state == state ? true : false;
 156 }
 157
 158 static void
 159 sev_set_guest_state(SevGuestState *sev, SevState new_state)
 160 {
 161     assert(new_state < SEV_STATE__MAX);
 162     assert(sev);
 163
 164     trace_kvm_sev_change_state(SevState_str(sev->state),
 165                                SevState_str(new_state));
 166     sev->state = new_state;
 167 }
 168
 169 static void
 170 sev_ram_block_added(RAMBlockNotifier *n, void *host, size_t size)
 171 {
 172     int r;
 173     struct kvm_enc_region range;
 174     ram_addr_t offset;
 175     MemoryRegion *mr;
 176
 177     /*
 178      * The RAM device presents a memory region that should be treated
 179      * as IO region and should not be pinned.
 180      */
 181     mr = memory_region_from_host(host, &offset);
 182     if (mr && memory_region_is_ram_device(mr)) {
 183         return;
 184     }
 185
 186     range.addr = (__u64)(unsigned long)host;
 187     range.size = size;
 188
 189     trace_kvm_memcrypt_register_region(host, size);
 190     r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_REG_REGION, &range);
 191     if (r) {
 192         error_report("%s: failed to register region (%p+%#zx) error '%s'",
 193                      __func__, host, size, strerror(errno));
 194         exit(1);
 195     }
 196 }
 197
 198 static void
 199 sev_ram_block_removed(RAMBlockNotifier *n, void *host, size_t size)
 200 {
 201     int r;
 202     struct kvm_enc_region range;
 203     ram_addr_t offset;
 204     MemoryRegion *mr;
 205
 206     /*
 207      * The RAM device presents a memory region that should be treated
 208      * as IO region and should not have been pinned.
 209      */
 210     mr = memory_region_from_host(host, &offset);
 211     if (mr && memory_region_is_ram_device(mr)) {
 212         return;
 213     }
 214
 215     range.addr = (__u64)(unsigned long)host;
 216     range.size = size;
 217
 218     trace_kvm_memcrypt_unregister_region(host, size);
 219     r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_UNREG_REGION, &range);
 220     if (r) {
 221         error_report("%s: failed to unregister region (%p+%#zx)",
 222                      __func__, host, size);
 223     }
 224 }
 225
 226 static struct RAMBlockNotifier sev_ram_notifier = {
 227     .ram_block_added = sev_ram_block_added,
 228     .ram_block_removed = sev_ram_block_removed,
 229 };
 230
 231 static void
 232 sev_guest_finalize(Object *obj)
 233 {
 234 }
 235
 236 static char *
 237 sev_guest_get_session_file(Object *obj, Error **errp)
 238 {
 239     SevGuestState *s = SEV_GUEST(obj);
 240
 241     return s->session_file ? g_strdup(s->session_file) : NULL;
 242 }
 243
 244 static void
 245 sev_guest_set_session_file(Object *obj, const char *value, Error **errp)
 246 {
 247     SevGuestState *s = SEV_GUEST(obj);
 248
 249     s->session_file = g_strdup(value);
 250 }
 251
 252 static char *
 253 sev_guest_get_dh_cert_file(Object *obj, Error **errp)
 254 {
 255     SevGuestState *s = SEV_GUEST(obj);
 256
 257     return g_strdup(s->dh_cert_file);
 258 }
 259
 260 static void
 261 sev_guest_set_dh_cert_file(Object *obj, const char *value, Error **errp)
 262 {
 263     SevGuestState *s = SEV_GUEST(obj);
 264
 265     s->dh_cert_file = g_strdup(value);
 266 }
 267
 268 static char *
 269 sev_guest_get_sev_device(Object *obj, Error **errp)
 270 {
 271     SevGuestState *sev = SEV_GUEST(obj);
 272
 273     return g_strdup(sev->sev_device);
 274 }
 275
 276 static void
 277 sev_guest_set_sev_device(Object *obj, const char *value, Error **errp)
 278 {
 279     SevGuestState *sev = SEV_GUEST(obj);
 280
 281     sev->sev_device = g_strdup(value);
 282 }
 283
 284 static void
 285 sev_guest_class_init(ObjectClass *oc, void *data)
 286 {
 287     object_class_property_add_str(oc, "sev-device",
 288                                   sev_guest_get_sev_device,
 289                                   sev_guest_set_sev_device);
 290     object_class_property_set_description(oc, "sev-device",
 291             "SEV device to use");
 292     object_class_property_add_str(oc, "dh-cert-file",
 293                                   sev_guest_get_dh_cert_file,
 294                                   sev_guest_set_dh_cert_file);
 295     object_class_property_set_description(oc, "dh-cert-file",
 296             "guest owners DH certificate (encoded with base64)");
 297     object_class_property_add_str(oc, "session-file",
 298                                   sev_guest_get_session_file,
 299                                   sev_guest_set_session_file);
 300     object_class_property_set_description(oc, "session-file",
 301             "guest owners session parameters (encoded with base64)");
 302 }
 303
 304 static void
 305 sev_guest_instance_init(Object *obj)
 306 {
 307     SevGuestState *sev = SEV_GUEST(obj);
 308
 309     sev->sev_device = g_strdup(DEFAULT_SEV_DEVICE);
 310     sev->policy = DEFAULT_GUEST_POLICY;
 311     object_property_add_uint32_ptr(obj, "policy", &sev->policy,
 312                                    OBJ_PROP_FLAG_READWRITE);
 313     object_property_add_uint32_ptr(obj, "handle", &sev->handle,
 314                                    OBJ_PROP_FLAG_READWRITE);
 315     object_property_add_uint32_ptr(obj, "cbitpos", &sev->cbitpos,
 316                                    OBJ_PROP_FLAG_READWRITE);
 317     object_property_add_uint32_ptr(obj, "reduced-phys-bits",
 318                                    &sev->reduced_phys_bits,
 319                                    OBJ_PROP_FLAG_READWRITE);
 320 }
 321
 322 /* sev guest info */
 323 static const TypeInfo sev_guest_info = {
 324     .parent = TYPE_OBJECT,
 325     .name = TYPE_SEV_GUEST,
 326     .instance_size = sizeof(SevGuestState),
 327     .instance_finalize = sev_guest_finalize,
 328     .class_init = sev_guest_class_init,
 329     .instance_init = sev_guest_instance_init,
 330     .interfaces = (InterfaceInfo[]) {
 331         { TYPE_USER_CREATABLE },
 332         { }
 333     }
 334 };
 335
 336 static SevGuestState *
 337 lookup_sev_guest_info(const char *id)
 338 {
 339     Object *obj;
 340     SevGuestState *info;
 341
 342     obj = object_resolve_path_component(object_get_objects_root(), id);
 343     if (!obj) {
 344         return NULL;
 345     }
 346
 347     info = (SevGuestState *)
 348             object_dynamic_cast(obj, TYPE_SEV_GUEST);
 349     if (!info) {
 350         return NULL;
 351     }
 352
 353     return info;
 354 }
 355
 356 bool
 357 sev_enabled(void)
 358 {
 359     return !!sev_guest;
 360 }
 361
 362 uint64_t
 363 sev_get_me_mask(void)
 364 {
 365     return sev_guest ? sev_guest->me_mask : ~0;
 366 }
 367
 368 uint32_t
 369 sev_get_cbit_position(void)
 370 {
 371     return sev_guest ? sev_guest->cbitpos : 0;
 372 }
 373
 374 uint32_t
 375 sev_get_reduced_phys_bits(void)
 376 {
 377     return sev_guest ? sev_guest->reduced_phys_bits : 0;
 378 }
 379
 380 SevInfo *
 381 sev_get_info(void)
 382 {
 383     SevInfo *info;
 384
 385     info = g_new0(SevInfo, 1);
 386     info->enabled = sev_enabled();
 387
 388     if (info->enabled) {
 389         info->api_major = sev_guest->api_major;
 390         info->api_minor = sev_guest->api_minor;
 391         info->build_id = sev_guest->build_id;
 392         info->policy = sev_guest->policy;
 393         info->state = sev_guest->state;
 394         info->handle = sev_guest->handle;
 395     }
 396
 397     return info;
 398 }
 399
 400 static int
 401 sev_get_pdh_info(int fd, guchar **pdh, size_t *pdh_len, guchar **cert_chain,
 402                  size_t *cert_chain_len)
 403 {
 404     guchar *pdh_data = NULL;
 405     guchar *cert_chain_data = NULL;
 406     struct sev_user_data_pdh_cert_export export = {};
 407     int err, r;
 408
 409     /* query the certificate length */
 410     r = sev_platform_ioctl(fd, SEV_PDH_CERT_EXPORT, &export, &err);
 411     if (r < 0) {
 412         if (err != SEV_RET_INVALID_LEN) {
 413             error_report("failed to export PDH cert ret=%d fw_err=%d (%s)",
 414                          r, err, fw_error_to_str(err));
 415             return 1;
 416         }
 417     }
 418
 419     pdh_data = g_new(guchar, export.pdh_cert_len);
 420     cert_chain_data = g_new(guchar, export.cert_chain_len);
 421     export.pdh_cert_address = (unsigned long)pdh_data;
 422     export.cert_chain_address = (unsigned long)cert_chain_data;
 423
 424     r = sev_platform_ioctl(fd, SEV_PDH_CERT_EXPORT, &export, &err);
 425     if (r < 0) {
 426         error_report("failed to export PDH cert ret=%d fw_err=%d (%s)",
 427                      r, err, fw_error_to_str(err));
 428         goto e_free;
 429     }
 430
 431     *pdh = pdh_data;
 432     *pdh_len = export.pdh_cert_len;
 433     *cert_chain = cert_chain_data;
 434     *cert_chain_len = export.cert_chain_len;
 435     return 0;
 436
 437 e_free:
 438     g_free(pdh_data);
 439     g_free(cert_chain_data);
 440     return 1;
 441 }
 442
 443 SevCapability *
 444 sev_get_capabilities(void)
 445 {
 446     SevCapability *cap = NULL;
 447     guchar *pdh_data = NULL;
 448     guchar *cert_chain_data = NULL;
 449     size_t pdh_len = 0, cert_chain_len = 0;
 450     uint32_t ebx;
 451     int fd;
 452
 453     fd = open(DEFAULT_SEV_DEVICE, O_RDWR);
 454     if (fd < 0) {
 455         error_report("%s: Failed to open %s '%s'", __func__,
 456                      DEFAULT_SEV_DEVICE, strerror(errno));
 457         return NULL;
 458     }
 459
 460     if (sev_get_pdh_info(fd, &pdh_data, &pdh_len,
 461                          &cert_chain_data, &cert_chain_len)) {
 462         goto out;
 463     }
 464
 465     cap = g_new0(SevCapability, 1);
 466     cap->pdh = g_base64_encode(pdh_data, pdh_len);
 467     cap->cert_chain = g_base64_encode(cert_chain_data, cert_chain_len);
 468
 469     host_cpuid(0x8000001F, 0, NULL, &ebx, NULL, NULL);
 470     cap->cbitpos = ebx & 0x3f;
 471
 472     /*
 473      * When SEV feature is enabled, we loose one bit in guest physical
 474      * addressing.
 475      */
 476     cap->reduced_phys_bits = 1;
 477
 478 out:
 479     g_free(pdh_data);
 480     g_free(cert_chain_data);
 481     close(fd);
 482     return cap;
 483 }
 484
 485 static int
 486 sev_read_file_base64(const char *filename, guchar **data, gsize *len)
 487 {
 488     gsize sz;
 489     gchar *base64;
 490     GError *error = NULL;
 491
 492     if (!g_file_get_contents(filename, &base64, &sz, &error)) {
 493         error_report("failed to read '%s' (%s)", filename, error->message);
 494         return -1;
 495     }
 496
 497     *data = g_base64_decode(base64, len);
 498     return 0;
 499 }
 500
 501 static int
 502 sev_launch_start(SevGuestState *sev)
 503 {
 504     gsize sz;
 505     int ret = 1;
 506     int fw_error, rc;
 507     struct kvm_sev_launch_start *start;
 508     guchar *session = NULL, *dh_cert = NULL;
 509
 510     start = g_new0(struct kvm_sev_launch_start, 1);
 511
 512     start->handle = sev->handle;
 513     start->policy = sev->policy;
 514     if (sev->session_file) {
 515         if (sev_read_file_base64(sev->session_file, &session, &sz) < 0) {
 516             goto out;
 517         }
 518         start->session_uaddr = (unsigned long)session;
 519         start->session_len = sz;
 520     }
 521
 522     if (sev->dh_cert_file) {
 523         if (sev_read_file_base64(sev->dh_cert_file, &dh_cert, &sz) < 0) {
 524             goto out;
 525         }
 526         start->dh_uaddr = (unsigned long)dh_cert;
 527         start->dh_len = sz;
 528     }
 529
 530     trace_kvm_sev_launch_start(start->policy, session, dh_cert);
 531     rc = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_START, start, &fw_error);
 532     if (rc < 0) {
 533         error_report("%s: LAUNCH_START ret=%d fw_error=%d '%s'",
 534                 __func__, ret, fw_error, fw_error_to_str(fw_error));
 535         goto out;
 536     }
 537
 538     sev_set_guest_state(sev, SEV_STATE_LAUNCH_UPDATE);
 539     sev->handle = start->handle;
 540     ret = 0;
 541
 542 out:
 543     g_free(start);
 544     g_free(session);
 545     g_free(dh_cert);
 546     return ret;
 547 }
 548
 549 static int
 550 sev_launch_update_data(SevGuestState *sev, uint8_t *addr, uint64_t len)
 551 {
 552     int ret, fw_error;
 553     struct kvm_sev_launch_update_data update;
 554
 555     if (!addr || !len) {
 556         return 1;
 557     }
 558
 559     update.uaddr = (__u64)(unsigned long)addr;
 560     update.len = len;
 561     trace_kvm_sev_launch_update_data(addr, len);
 562     ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_UPDATE_DATA,
 563                     &update, &fw_error);
 564     if (ret) {
 565         error_report("%s: LAUNCH_UPDATE ret=%d fw_error=%d '%s'",
 566                 __func__, ret, fw_error, fw_error_to_str(fw_error));
 567     }
 568
 569     return ret;
 570 }
 571
 572 static void
 573 sev_launch_get_measure(Notifier *notifier, void *unused)
 574 {
 575     SevGuestState *sev = sev_guest;
 576     int ret, error;
 577     guchar *data;
 578     struct kvm_sev_launch_measure *measurement;
 579
 580     if (!sev_check_state(sev, SEV_STATE_LAUNCH_UPDATE)) {
 581         return;
 582     }
 583
 584     measurement = g_new0(struct kvm_sev_launch_measure, 1);
 585
 586     /* query the measurement blob length */
 587     ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
 588                     measurement, &error);
 589     if (!measurement->len) {
 590         error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
 591                      __func__, ret, error, fw_error_to_str(errno));
 592         goto free_measurement;
 593     }
 594
 595     data = g_new0(guchar, measurement->len);
 596     measurement->uaddr = (unsigned long)data;
 597
 598     /* get the measurement blob */
 599     ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
 600                     measurement, &error);
 601     if (ret) {
 602         error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
 603                      __func__, ret, error, fw_error_to_str(errno));
 604         goto free_data;
 605     }
 606
 607     sev_set_guest_state(sev, SEV_STATE_LAUNCH_SECRET);
 608
 609     /* encode the measurement value and emit the event */
 610     sev->measurement = g_base64_encode(data, measurement->len);
 611     trace_kvm_sev_launch_measurement(sev->measurement);
 612
 613 free_data:
 614     g_free(data);
 615 free_measurement:
 616     g_free(measurement);
 617 }
 618
 619 char *
 620 sev_get_launch_measurement(void)
 621 {
 622     if (sev_guest &&
 623         sev_guest->state >= SEV_STATE_LAUNCH_SECRET) {
 624         return g_strdup(sev_guest->measurement);
 625     }
 626
 627     return NULL;
 628 }
 629
 630 static Notifier sev_machine_done_notify = {
 631     .notify = sev_launch_get_measure,
 632 };
 633
 634 static void
 635 sev_launch_finish(SevGuestState *sev)
 636 {
 637     int ret, error;
 638     Error *local_err = NULL;
 639
 640     trace_kvm_sev_launch_finish();
 641     ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_FINISH, 0, &error);
 642     if (ret) {
 643         error_report("%s: LAUNCH_FINISH ret=%d fw_error=%d '%s'",
 644                      __func__, ret, error, fw_error_to_str(error));
 645         exit(1);
 646     }
 647
 648     sev_set_guest_state(sev, SEV_STATE_RUNNING);
 649
 650     /* add migration blocker */
 651     error_setg(&sev_mig_blocker,
 652                "SEV: Migration is not implemented");
 653     ret = migrate_add_blocker(sev_mig_blocker, &local_err);
 654     if (local_err) {
 655         error_report_err(local_err);
 656         error_free(sev_mig_blocker);
 657         exit(1);
 658     }
 659 }
 660
 661 static void
 662 sev_vm_state_change(void *opaque, int running, RunState state)
 663 {
 664     SevGuestState *sev = opaque;
 665
 666     if (running) {
 667         if (!sev_check_state(sev, SEV_STATE_RUNNING)) {
 668             sev_launch_finish(sev);
 669         }
 670     }
 671 }
 672
 673 void *
 674 sev_guest_init(const char *id)
 675 {
 676     SevGuestState *sev;
 677     char *devname;
 678     int ret, fw_error;
 679     uint32_t ebx;
 680     uint32_t host_cbitpos;
 681     struct sev_user_data_status status = {};
 682
 683     ret = ram_block_discard_disable(true);
 684     if (ret) {
 685         error_report("%s: cannot disable RAM discard", __func__);
 686         return NULL;
 687     }
 688
 689     sev = lookup_sev_guest_info(id);
 690     if (!sev) {
 691         error_report("%s: '%s' is not a valid '%s' object",
 692                      __func__, id, TYPE_SEV_GUEST);
 693         goto err;
 694     }
 695
 696     sev_guest = sev;
 697     sev->state = SEV_STATE_UNINIT;
 698
 699     host_cpuid(0x8000001F, 0, NULL, &ebx, NULL, NULL);
 700     host_cbitpos = ebx & 0x3f;
 701
 702     if (host_cbitpos != sev->cbitpos) {
 703         error_report("%s: cbitpos check failed, host '%d' requested '%d'",
 704                      __func__, host_cbitpos, sev->cbitpos);
 705         goto err;
 706     }
 707
 708     if (sev->reduced_phys_bits < 1) {
 709         error_report("%s: reduced_phys_bits check failed, it should be >=1,"
 710                      " requested '%d'", __func__, sev->reduced_phys_bits);
 711         goto err;
 712     }
 713
 714     sev->me_mask = ~(1UL << sev->cbitpos);
 715
 716     devname = object_property_get_str(OBJECT(sev), "sev-device", NULL);
 717     sev->sev_fd = open(devname, O_RDWR);
 718     if (sev->sev_fd < 0) {
 719         error_report("%s: Failed to open %s '%s'", __func__,
 720                      devname, strerror(errno));
 721     }
 722     g_free(devname);
 723     if (sev->sev_fd < 0) {
 724         goto err;
 725     }
 726
 727     ret = sev_platform_ioctl(sev->sev_fd, SEV_PLATFORM_STATUS, &status,
 728                              &fw_error);
 729     if (ret) {
 730         error_report("%s: failed to get platform status ret=%d "
 731                      "fw_error='%d: %s'", __func__, ret, fw_error,
 732                      fw_error_to_str(fw_error));
 733         goto err;
 734     }
 735     sev->build_id = status.build;
 736     sev->api_major = status.api_major;
 737     sev->api_minor = status.api_minor;
 738
 739     trace_kvm_sev_init();
 740     ret = sev_ioctl(sev->sev_fd, KVM_SEV_INIT, NULL, &fw_error);
 741     if (ret) {
 742         error_report("%s: failed to initialize ret=%d fw_error=%d '%s'",
 743                      __func__, ret, fw_error, fw_error_to_str(fw_error));
 744         goto err;
 745     }
 746
 747     ret = sev_launch_start(sev);
 748     if (ret) {
 749         error_report("%s: failed to create encryption context", __func__);
 750         goto err;
 751     }
 752
 753     ram_block_notifier_add(&sev_ram_notifier);
 754     qemu_add_machine_init_done_notifier(&sev_machine_done_notify);
 755     qemu_add_vm_change_state_handler(sev_vm_state_change, sev);
 756
 757     return sev;
 758 err:
 759     sev_guest = NULL;
 760     ram_block_discard_disable(false);
 761     return NULL;
 762 }
 763
 764 int
 765 sev_encrypt_data(void *handle, uint8_t *ptr, uint64_t len)
 766 {
 767     SevGuestState *sev = handle;
 768
 769     assert(sev);
 770
 771     /* if SEV is in update state then encrypt the data else do nothing */
 772     if (sev_check_state(sev, SEV_STATE_LAUNCH_UPDATE)) {
 773         return sev_launch_update_data(sev, ptr, len);
 774     }
 775
 776     return 0;
 777 }
 778
 779 static void
 780 sev_register_types(void)
 781 {
 782     type_register_static(&sev_guest_info);
 783 }
 784
 785 type_init(sev_register_types);