1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * Copyright (c) 2009-2015 Red Hat Inc 6 * 7 * Authors: 8 * Juan Quintela <quintela@redhat.com> 9 * 10 * Permission is hereby granted, free of charge, to any person obtaining a copy 11 * of this software and associated documentation files (the "Software"), to deal 12 * in the Software without restriction, including without limitation the rights 13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 14 * copies of the Software, and to permit persons to whom the Software is 15 * furnished to do so, subject to the following conditions: 16 * 17 * The above copyright notice and this permission notice shall be included in 18 * all copies or substantial portions of the Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 26 * THE SOFTWARE. 27 */ 28 29 #include "qemu/osdep.h" 30 #include "qemu-common.h" 31 #include "hw/boards.h" 32 #include "hw/hw.h" 33 #include "hw/qdev.h" 34 #include "net/net.h" 35 #include "monitor/monitor.h" 36 #include "sysemu/sysemu.h" 37 #include "qemu/timer.h" 38 #include "audio/audio.h" 39 #include "migration/migration.h" 40 #include "migration/postcopy-ram.h" 41 #include "qapi/qmp/qerror.h" 42 #include "qemu/error-report.h" 43 #include "qemu/sockets.h" 44 #include "qemu/queue.h" 45 #include "sysemu/cpus.h" 46 #include "exec/memory.h" 47 #include "qmp-commands.h" 48 #include "trace.h" 49 #include "qemu/bitops.h" 50 #include "qemu/iov.h" 51 #include "block/snapshot.h" 52 #include "block/qapi.h" 53 54 55 #ifndef ETH_P_RARP 56 #define ETH_P_RARP 0x8035 57 #endif 58 #define ARP_HTYPE_ETH 0x0001 59 #define ARP_PTYPE_IP 0x0800 60 #define ARP_OP_REQUEST_REV 0x3 61 62 const unsigned int postcopy_ram_discard_version = 0; 63 64 static bool skip_section_footers; 65 66 static struct mig_cmd_args { 67 ssize_t len; /* -1 = variable */ 68 const char *name; 69 } mig_cmd_args[] = { 70 [MIG_CMD_INVALID] = { .len = -1, .name = "INVALID" }, 71 [MIG_CMD_OPEN_RETURN_PATH] = { .len = 0, .name = "OPEN_RETURN_PATH" }, 72 [MIG_CMD_PING] = { .len = sizeof(uint32_t), .name = "PING" }, 73 [MIG_CMD_POSTCOPY_ADVISE] = { .len = 16, .name = "POSTCOPY_ADVISE" }, 74 [MIG_CMD_POSTCOPY_LISTEN] = { .len = 0, .name = "POSTCOPY_LISTEN" }, 75 [MIG_CMD_POSTCOPY_RUN] = { .len = 0, .name = "POSTCOPY_RUN" }, 76 [MIG_CMD_POSTCOPY_RAM_DISCARD] = { 77 .len = -1, .name = "POSTCOPY_RAM_DISCARD" }, 78 [MIG_CMD_PACKAGED] = { .len = 4, .name = "PACKAGED" }, 79 [MIG_CMD_MAX] = { .len = -1, .name = "MAX" }, 80 }; 81 82 static int announce_self_create(uint8_t *buf, 83 uint8_t *mac_addr) 84 { 85 /* Ethernet header. */ 86 memset(buf, 0xff, 6); /* destination MAC addr */ 87 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */ 88 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */ 89 90 /* RARP header. */ 91 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */ 92 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */ 93 *(buf + 18) = 6; /* hardware addr length (ethernet) */ 94 *(buf + 19) = 4; /* protocol addr length (IPv4) */ 95 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */ 96 memcpy(buf + 22, mac_addr, 6); /* source hw addr */ 97 memset(buf + 28, 0x00, 4); /* source protocol addr */ 98 memcpy(buf + 32, mac_addr, 6); /* target hw addr */ 99 memset(buf + 38, 0x00, 4); /* target protocol addr */ 100 101 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */ 102 memset(buf + 42, 0x00, 18); 103 104 return 60; /* len (FCS will be added by hardware) */ 105 } 106 107 static void qemu_announce_self_iter(NICState *nic, void *opaque) 108 { 109 uint8_t buf[60]; 110 int len; 111 112 trace_qemu_announce_self_iter(qemu_ether_ntoa(&nic->conf->macaddr)); 113 len = announce_self_create(buf, nic->conf->macaddr.a); 114 115 qemu_send_packet_raw(qemu_get_queue(nic), buf, len); 116 } 117 118 119 static void qemu_announce_self_once(void *opaque) 120 { 121 static int count = SELF_ANNOUNCE_ROUNDS; 122 QEMUTimer *timer = *(QEMUTimer **)opaque; 123 124 qemu_foreach_nic(qemu_announce_self_iter, NULL); 125 126 if (--count) { 127 /* delay 50ms, 150ms, 250ms, ... */ 128 timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 129 self_announce_delay(count)); 130 } else { 131 timer_del(timer); 132 timer_free(timer); 133 } 134 } 135 136 void qemu_announce_self(void) 137 { 138 static QEMUTimer *timer; 139 timer = timer_new_ms(QEMU_CLOCK_REALTIME, qemu_announce_self_once, &timer); 140 qemu_announce_self_once(&timer); 141 } 142 143 /***********************************************************/ 144 /* savevm/loadvm support */ 145 146 static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt, 147 int64_t pos) 148 { 149 int ret; 150 QEMUIOVector qiov; 151 152 qemu_iovec_init_external(&qiov, iov, iovcnt); 153 ret = bdrv_writev_vmstate(opaque, &qiov, pos); 154 if (ret < 0) { 155 return ret; 156 } 157 158 return qiov.size; 159 } 160 161 static ssize_t block_put_buffer(void *opaque, const uint8_t *buf, 162 int64_t pos, size_t size) 163 { 164 bdrv_save_vmstate(opaque, buf, pos, size); 165 return size; 166 } 167 168 static ssize_t block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, 169 size_t size) 170 { 171 return bdrv_load_vmstate(opaque, buf, pos, size); 172 } 173 174 static int bdrv_fclose(void *opaque) 175 { 176 return bdrv_flush(opaque); 177 } 178 179 static const QEMUFileOps bdrv_read_ops = { 180 .get_buffer = block_get_buffer, 181 .close = bdrv_fclose 182 }; 183 184 static const QEMUFileOps bdrv_write_ops = { 185 .put_buffer = block_put_buffer, 186 .writev_buffer = block_writev_buffer, 187 .close = bdrv_fclose 188 }; 189 190 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable) 191 { 192 if (is_writable) { 193 return qemu_fopen_ops(bs, &bdrv_write_ops); 194 } 195 return qemu_fopen_ops(bs, &bdrv_read_ops); 196 } 197 198 199 /* QEMUFile timer support. 200 * Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c 201 */ 202 203 void timer_put(QEMUFile *f, QEMUTimer *ts) 204 { 205 uint64_t expire_time; 206 207 expire_time = timer_expire_time_ns(ts); 208 qemu_put_be64(f, expire_time); 209 } 210 211 void timer_get(QEMUFile *f, QEMUTimer *ts) 212 { 213 uint64_t expire_time; 214 215 expire_time = qemu_get_be64(f); 216 if (expire_time != -1) { 217 timer_mod_ns(ts, expire_time); 218 } else { 219 timer_del(ts); 220 } 221 } 222 223 224 /* VMState timer support. 225 * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c 226 */ 227 228 static int get_timer(QEMUFile *f, void *pv, size_t size) 229 { 230 QEMUTimer *v = pv; 231 timer_get(f, v); 232 return 0; 233 } 234 235 static void put_timer(QEMUFile *f, void *pv, size_t size) 236 { 237 QEMUTimer *v = pv; 238 timer_put(f, v); 239 } 240 241 const VMStateInfo vmstate_info_timer = { 242 .name = "timer", 243 .get = get_timer, 244 .put = put_timer, 245 }; 246 247 248 typedef struct CompatEntry { 249 char idstr[256]; 250 int instance_id; 251 } CompatEntry; 252 253 typedef struct SaveStateEntry { 254 QTAILQ_ENTRY(SaveStateEntry) entry; 255 char idstr[256]; 256 int instance_id; 257 int alias_id; 258 int version_id; 259 int section_id; 260 SaveVMHandlers *ops; 261 const VMStateDescription *vmsd; 262 void *opaque; 263 CompatEntry *compat; 264 int is_ram; 265 } SaveStateEntry; 266 267 typedef struct SaveState { 268 QTAILQ_HEAD(, SaveStateEntry) handlers; 269 int global_section_id; 270 bool skip_configuration; 271 uint32_t len; 272 const char *name; 273 } SaveState; 274 275 static SaveState savevm_state = { 276 .handlers = QTAILQ_HEAD_INITIALIZER(savevm_state.handlers), 277 .global_section_id = 0, 278 .skip_configuration = false, 279 }; 280 281 void savevm_skip_configuration(void) 282 { 283 savevm_state.skip_configuration = true; 284 } 285 286 287 static void configuration_pre_save(void *opaque) 288 { 289 SaveState *state = opaque; 290 const char *current_name = MACHINE_GET_CLASS(current_machine)->name; 291 292 state->len = strlen(current_name); 293 state->name = current_name; 294 } 295 296 static int configuration_post_load(void *opaque, int version_id) 297 { 298 SaveState *state = opaque; 299 const char *current_name = MACHINE_GET_CLASS(current_machine)->name; 300 301 if (strncmp(state->name, current_name, state->len) != 0) { 302 error_report("Machine type received is '%.*s' and local is '%s'", 303 (int) state->len, state->name, current_name); 304 return -EINVAL; 305 } 306 return 0; 307 } 308 309 static const VMStateDescription vmstate_configuration = { 310 .name = "configuration", 311 .version_id = 1, 312 .post_load = configuration_post_load, 313 .pre_save = configuration_pre_save, 314 .fields = (VMStateField[]) { 315 VMSTATE_UINT32(len, SaveState), 316 VMSTATE_VBUFFER_ALLOC_UINT32(name, SaveState, 0, NULL, 0, len), 317 VMSTATE_END_OF_LIST() 318 }, 319 }; 320 321 static void dump_vmstate_vmsd(FILE *out_file, 322 const VMStateDescription *vmsd, int indent, 323 bool is_subsection); 324 325 static void dump_vmstate_vmsf(FILE *out_file, const VMStateField *field, 326 int indent) 327 { 328 fprintf(out_file, "%*s{\n", indent, ""); 329 indent += 2; 330 fprintf(out_file, "%*s\"field\": \"%s\",\n", indent, "", field->name); 331 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", 332 field->version_id); 333 fprintf(out_file, "%*s\"field_exists\": %s,\n", indent, "", 334 field->field_exists ? "true" : "false"); 335 fprintf(out_file, "%*s\"size\": %zu", indent, "", field->size); 336 if (field->vmsd != NULL) { 337 fprintf(out_file, ",\n"); 338 dump_vmstate_vmsd(out_file, field->vmsd, indent, false); 339 } 340 fprintf(out_file, "\n%*s}", indent - 2, ""); 341 } 342 343 static void dump_vmstate_vmss(FILE *out_file, 344 const VMStateDescription **subsection, 345 int indent) 346 { 347 if (*subsection != NULL) { 348 dump_vmstate_vmsd(out_file, *subsection, indent, true); 349 } 350 } 351 352 static void dump_vmstate_vmsd(FILE *out_file, 353 const VMStateDescription *vmsd, int indent, 354 bool is_subsection) 355 { 356 if (is_subsection) { 357 fprintf(out_file, "%*s{\n", indent, ""); 358 } else { 359 fprintf(out_file, "%*s\"%s\": {\n", indent, "", "Description"); 360 } 361 indent += 2; 362 fprintf(out_file, "%*s\"name\": \"%s\",\n", indent, "", vmsd->name); 363 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", 364 vmsd->version_id); 365 fprintf(out_file, "%*s\"minimum_version_id\": %d", indent, "", 366 vmsd->minimum_version_id); 367 if (vmsd->fields != NULL) { 368 const VMStateField *field = vmsd->fields; 369 bool first; 370 371 fprintf(out_file, ",\n%*s\"Fields\": [\n", indent, ""); 372 first = true; 373 while (field->name != NULL) { 374 if (field->flags & VMS_MUST_EXIST) { 375 /* Ignore VMSTATE_VALIDATE bits; these don't get migrated */ 376 field++; 377 continue; 378 } 379 if (!first) { 380 fprintf(out_file, ",\n"); 381 } 382 dump_vmstate_vmsf(out_file, field, indent + 2); 383 field++; 384 first = false; 385 } 386 fprintf(out_file, "\n%*s]", indent, ""); 387 } 388 if (vmsd->subsections != NULL) { 389 const VMStateDescription **subsection = vmsd->subsections; 390 bool first; 391 392 fprintf(out_file, ",\n%*s\"Subsections\": [\n", indent, ""); 393 first = true; 394 while (*subsection != NULL) { 395 if (!first) { 396 fprintf(out_file, ",\n"); 397 } 398 dump_vmstate_vmss(out_file, subsection, indent + 2); 399 subsection++; 400 first = false; 401 } 402 fprintf(out_file, "\n%*s]", indent, ""); 403 } 404 fprintf(out_file, "\n%*s}", indent - 2, ""); 405 } 406 407 static void dump_machine_type(FILE *out_file) 408 { 409 MachineClass *mc; 410 411 mc = MACHINE_GET_CLASS(current_machine); 412 413 fprintf(out_file, " \"vmschkmachine\": {\n"); 414 fprintf(out_file, " \"Name\": \"%s\"\n", mc->name); 415 fprintf(out_file, " },\n"); 416 } 417 418 void dump_vmstate_json_to_file(FILE *out_file) 419 { 420 GSList *list, *elt; 421 bool first; 422 423 fprintf(out_file, "{\n"); 424 dump_machine_type(out_file); 425 426 first = true; 427 list = object_class_get_list(TYPE_DEVICE, true); 428 for (elt = list; elt; elt = elt->next) { 429 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data, 430 TYPE_DEVICE); 431 const char *name; 432 int indent = 2; 433 434 if (!dc->vmsd) { 435 continue; 436 } 437 438 if (!first) { 439 fprintf(out_file, ",\n"); 440 } 441 name = object_class_get_name(OBJECT_CLASS(dc)); 442 fprintf(out_file, "%*s\"%s\": {\n", indent, "", name); 443 indent += 2; 444 fprintf(out_file, "%*s\"Name\": \"%s\",\n", indent, "", name); 445 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", 446 dc->vmsd->version_id); 447 fprintf(out_file, "%*s\"minimum_version_id\": %d,\n", indent, "", 448 dc->vmsd->minimum_version_id); 449 450 dump_vmstate_vmsd(out_file, dc->vmsd, indent, false); 451 452 fprintf(out_file, "\n%*s}", indent - 2, ""); 453 first = false; 454 } 455 fprintf(out_file, "\n}\n"); 456 fclose(out_file); 457 } 458 459 static int calculate_new_instance_id(const char *idstr) 460 { 461 SaveStateEntry *se; 462 int instance_id = 0; 463 464 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 465 if (strcmp(idstr, se->idstr) == 0 466 && instance_id <= se->instance_id) { 467 instance_id = se->instance_id + 1; 468 } 469 } 470 return instance_id; 471 } 472 473 static int calculate_compat_instance_id(const char *idstr) 474 { 475 SaveStateEntry *se; 476 int instance_id = 0; 477 478 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 479 if (!se->compat) { 480 continue; 481 } 482 483 if (strcmp(idstr, se->compat->idstr) == 0 484 && instance_id <= se->compat->instance_id) { 485 instance_id = se->compat->instance_id + 1; 486 } 487 } 488 return instance_id; 489 } 490 491 /* TODO: Individual devices generally have very little idea about the rest 492 of the system, so instance_id should be removed/replaced. 493 Meanwhile pass -1 as instance_id if you do not already have a clearly 494 distinguishing id for all instances of your device class. */ 495 int register_savevm_live(DeviceState *dev, 496 const char *idstr, 497 int instance_id, 498 int version_id, 499 SaveVMHandlers *ops, 500 void *opaque) 501 { 502 SaveStateEntry *se; 503 504 se = g_new0(SaveStateEntry, 1); 505 se->version_id = version_id; 506 se->section_id = savevm_state.global_section_id++; 507 se->ops = ops; 508 se->opaque = opaque; 509 se->vmsd = NULL; 510 /* if this is a live_savem then set is_ram */ 511 if (ops->save_live_setup != NULL) { 512 se->is_ram = 1; 513 } 514 515 if (dev) { 516 char *id = qdev_get_dev_path(dev); 517 if (id) { 518 pstrcpy(se->idstr, sizeof(se->idstr), id); 519 pstrcat(se->idstr, sizeof(se->idstr), "/"); 520 g_free(id); 521 522 se->compat = g_new0(CompatEntry, 1); 523 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr); 524 se->compat->instance_id = instance_id == -1 ? 525 calculate_compat_instance_id(idstr) : instance_id; 526 instance_id = -1; 527 } 528 } 529 pstrcat(se->idstr, sizeof(se->idstr), idstr); 530 531 if (instance_id == -1) { 532 se->instance_id = calculate_new_instance_id(se->idstr); 533 } else { 534 se->instance_id = instance_id; 535 } 536 assert(!se->compat || se->instance_id == 0); 537 /* add at the end of list */ 538 QTAILQ_INSERT_TAIL(&savevm_state.handlers, se, entry); 539 return 0; 540 } 541 542 int register_savevm(DeviceState *dev, 543 const char *idstr, 544 int instance_id, 545 int version_id, 546 SaveStateHandler *save_state, 547 LoadStateHandler *load_state, 548 void *opaque) 549 { 550 SaveVMHandlers *ops = g_new0(SaveVMHandlers, 1); 551 ops->save_state = save_state; 552 ops->load_state = load_state; 553 return register_savevm_live(dev, idstr, instance_id, version_id, 554 ops, opaque); 555 } 556 557 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque) 558 { 559 SaveStateEntry *se, *new_se; 560 char id[256] = ""; 561 562 if (dev) { 563 char *path = qdev_get_dev_path(dev); 564 if (path) { 565 pstrcpy(id, sizeof(id), path); 566 pstrcat(id, sizeof(id), "/"); 567 g_free(path); 568 } 569 } 570 pstrcat(id, sizeof(id), idstr); 571 572 QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { 573 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) { 574 QTAILQ_REMOVE(&savevm_state.handlers, se, entry); 575 g_free(se->compat); 576 g_free(se->ops); 577 g_free(se); 578 } 579 } 580 } 581 582 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id, 583 const VMStateDescription *vmsd, 584 void *opaque, int alias_id, 585 int required_for_version) 586 { 587 SaveStateEntry *se; 588 589 /* If this triggers, alias support can be dropped for the vmsd. */ 590 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id); 591 592 se = g_new0(SaveStateEntry, 1); 593 se->version_id = vmsd->version_id; 594 se->section_id = savevm_state.global_section_id++; 595 se->opaque = opaque; 596 se->vmsd = vmsd; 597 se->alias_id = alias_id; 598 599 if (dev) { 600 char *id = qdev_get_dev_path(dev); 601 if (id) { 602 pstrcpy(se->idstr, sizeof(se->idstr), id); 603 pstrcat(se->idstr, sizeof(se->idstr), "/"); 604 g_free(id); 605 606 se->compat = g_new0(CompatEntry, 1); 607 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name); 608 se->compat->instance_id = instance_id == -1 ? 609 calculate_compat_instance_id(vmsd->name) : instance_id; 610 instance_id = -1; 611 } 612 } 613 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name); 614 615 if (instance_id == -1) { 616 se->instance_id = calculate_new_instance_id(se->idstr); 617 } else { 618 se->instance_id = instance_id; 619 } 620 assert(!se->compat || se->instance_id == 0); 621 /* add at the end of list */ 622 QTAILQ_INSERT_TAIL(&savevm_state.handlers, se, entry); 623 return 0; 624 } 625 626 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd, 627 void *opaque) 628 { 629 SaveStateEntry *se, *new_se; 630 631 QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { 632 if (se->vmsd == vmsd && se->opaque == opaque) { 633 QTAILQ_REMOVE(&savevm_state.handlers, se, entry); 634 g_free(se->compat); 635 g_free(se); 636 } 637 } 638 } 639 640 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id) 641 { 642 trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); 643 if (!se->vmsd) { /* Old style */ 644 return se->ops->load_state(f, se->opaque, version_id); 645 } 646 return vmstate_load_state(f, se->vmsd, se->opaque, version_id); 647 } 648 649 static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se, QJSON *vmdesc) 650 { 651 int64_t old_offset, size; 652 653 old_offset = qemu_ftell_fast(f); 654 se->ops->save_state(f, se->opaque); 655 size = qemu_ftell_fast(f) - old_offset; 656 657 if (vmdesc) { 658 json_prop_int(vmdesc, "size", size); 659 json_start_array(vmdesc, "fields"); 660 json_start_object(vmdesc, NULL); 661 json_prop_str(vmdesc, "name", "data"); 662 json_prop_int(vmdesc, "size", size); 663 json_prop_str(vmdesc, "type", "buffer"); 664 json_end_object(vmdesc); 665 json_end_array(vmdesc); 666 } 667 } 668 669 static void vmstate_save(QEMUFile *f, SaveStateEntry *se, QJSON *vmdesc) 670 { 671 trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); 672 if (!se->vmsd) { 673 vmstate_save_old_style(f, se, vmdesc); 674 return; 675 } 676 vmstate_save_state(f, se->vmsd, se->opaque, vmdesc); 677 } 678 679 void savevm_skip_section_footers(void) 680 { 681 skip_section_footers = true; 682 } 683 684 /* 685 * Write the header for device section (QEMU_VM_SECTION START/END/PART/FULL) 686 */ 687 static void save_section_header(QEMUFile *f, SaveStateEntry *se, 688 uint8_t section_type) 689 { 690 qemu_put_byte(f, section_type); 691 qemu_put_be32(f, se->section_id); 692 693 if (section_type == QEMU_VM_SECTION_FULL || 694 section_type == QEMU_VM_SECTION_START) { 695 /* ID string */ 696 size_t len = strlen(se->idstr); 697 qemu_put_byte(f, len); 698 qemu_put_buffer(f, (uint8_t *)se->idstr, len); 699 700 qemu_put_be32(f, se->instance_id); 701 qemu_put_be32(f, se->version_id); 702 } 703 } 704 705 /* 706 * Write a footer onto device sections that catches cases misformatted device 707 * sections. 708 */ 709 static void save_section_footer(QEMUFile *f, SaveStateEntry *se) 710 { 711 if (!skip_section_footers) { 712 qemu_put_byte(f, QEMU_VM_SECTION_FOOTER); 713 qemu_put_be32(f, se->section_id); 714 } 715 } 716 717 /** 718 * qemu_savevm_command_send: Send a 'QEMU_VM_COMMAND' type element with the 719 * command and associated data. 720 * 721 * @f: File to send command on 722 * @command: Command type to send 723 * @len: Length of associated data 724 * @data: Data associated with command. 725 */ 726 void qemu_savevm_command_send(QEMUFile *f, 727 enum qemu_vm_cmd command, 728 uint16_t len, 729 uint8_t *data) 730 { 731 trace_savevm_command_send(command, len); 732 qemu_put_byte(f, QEMU_VM_COMMAND); 733 qemu_put_be16(f, (uint16_t)command); 734 qemu_put_be16(f, len); 735 qemu_put_buffer(f, data, len); 736 qemu_fflush(f); 737 } 738 739 void qemu_savevm_send_ping(QEMUFile *f, uint32_t value) 740 { 741 uint32_t buf; 742 743 trace_savevm_send_ping(value); 744 buf = cpu_to_be32(value); 745 qemu_savevm_command_send(f, MIG_CMD_PING, sizeof(value), (uint8_t *)&buf); 746 } 747 748 void qemu_savevm_send_open_return_path(QEMUFile *f) 749 { 750 trace_savevm_send_open_return_path(); 751 qemu_savevm_command_send(f, MIG_CMD_OPEN_RETURN_PATH, 0, NULL); 752 } 753 754 /* We have a buffer of data to send; we don't want that all to be loaded 755 * by the command itself, so the command contains just the length of the 756 * extra buffer that we then send straight after it. 757 * TODO: Must be a better way to organise that 758 * 759 * Returns: 760 * 0 on success 761 * -ve on error 762 */ 763 int qemu_savevm_send_packaged(QEMUFile *f, const QEMUSizedBuffer *qsb) 764 { 765 size_t cur_iov; 766 size_t len = qsb_get_length(qsb); 767 uint32_t tmp; 768 769 if (len > MAX_VM_CMD_PACKAGED_SIZE) { 770 error_report("%s: Unreasonably large packaged state: %zu", 771 __func__, len); 772 return -1; 773 } 774 775 tmp = cpu_to_be32(len); 776 777 trace_qemu_savevm_send_packaged(); 778 qemu_savevm_command_send(f, MIG_CMD_PACKAGED, 4, (uint8_t *)&tmp); 779 780 /* all the data follows (concatinating the iov's) */ 781 for (cur_iov = 0; cur_iov < qsb->n_iov; cur_iov++) { 782 /* The iov entries are partially filled */ 783 size_t towrite = MIN(qsb->iov[cur_iov].iov_len, len); 784 len -= towrite; 785 786 if (!towrite) { 787 break; 788 } 789 790 qemu_put_buffer(f, qsb->iov[cur_iov].iov_base, towrite); 791 } 792 793 return 0; 794 } 795 796 /* Send prior to any postcopy transfer */ 797 void qemu_savevm_send_postcopy_advise(QEMUFile *f) 798 { 799 uint64_t tmp[2]; 800 tmp[0] = cpu_to_be64(getpagesize()); 801 tmp[1] = cpu_to_be64(1ul << qemu_target_page_bits()); 802 803 trace_qemu_savevm_send_postcopy_advise(); 804 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_ADVISE, 16, (uint8_t *)tmp); 805 } 806 807 /* Sent prior to starting the destination running in postcopy, discard pages 808 * that have already been sent but redirtied on the source. 809 * CMD_POSTCOPY_RAM_DISCARD consist of: 810 * byte version (0) 811 * byte Length of name field (not including 0) 812 * n x byte RAM block name 813 * byte 0 terminator (just for safety) 814 * n x Byte ranges within the named RAMBlock 815 * be64 Start of the range 816 * be64 Length 817 * 818 * name: RAMBlock name that these entries are part of 819 * len: Number of page entries 820 * start_list: 'len' addresses 821 * length_list: 'len' addresses 822 * 823 */ 824 void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name, 825 uint16_t len, 826 uint64_t *start_list, 827 uint64_t *length_list) 828 { 829 uint8_t *buf; 830 uint16_t tmplen; 831 uint16_t t; 832 size_t name_len = strlen(name); 833 834 trace_qemu_savevm_send_postcopy_ram_discard(name, len); 835 assert(name_len < 256); 836 buf = g_malloc0(1 + 1 + name_len + 1 + (8 + 8) * len); 837 buf[0] = postcopy_ram_discard_version; 838 buf[1] = name_len; 839 memcpy(buf + 2, name, name_len); 840 tmplen = 2 + name_len; 841 buf[tmplen++] = '\0'; 842 843 for (t = 0; t < len; t++) { 844 cpu_to_be64w((uint64_t *)(buf + tmplen), start_list[t]); 845 tmplen += 8; 846 cpu_to_be64w((uint64_t *)(buf + tmplen), length_list[t]); 847 tmplen += 8; 848 } 849 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RAM_DISCARD, tmplen, buf); 850 g_free(buf); 851 } 852 853 /* Get the destination into a state where it can receive postcopy data. */ 854 void qemu_savevm_send_postcopy_listen(QEMUFile *f) 855 { 856 trace_savevm_send_postcopy_listen(); 857 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_LISTEN, 0, NULL); 858 } 859 860 /* Kick the destination into running */ 861 void qemu_savevm_send_postcopy_run(QEMUFile *f) 862 { 863 trace_savevm_send_postcopy_run(); 864 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RUN, 0, NULL); 865 } 866 867 bool qemu_savevm_state_blocked(Error **errp) 868 { 869 SaveStateEntry *se; 870 871 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 872 if (se->vmsd && se->vmsd->unmigratable) { 873 error_setg(errp, "State blocked by non-migratable device '%s'", 874 se->idstr); 875 return true; 876 } 877 } 878 return false; 879 } 880 881 static bool enforce_config_section(void) 882 { 883 MachineState *machine = MACHINE(qdev_get_machine()); 884 return machine->enforce_config_section; 885 } 886 887 void qemu_savevm_state_header(QEMUFile *f) 888 { 889 trace_savevm_state_header(); 890 qemu_put_be32(f, QEMU_VM_FILE_MAGIC); 891 qemu_put_be32(f, QEMU_VM_FILE_VERSION); 892 893 if (!savevm_state.skip_configuration || enforce_config_section()) { 894 qemu_put_byte(f, QEMU_VM_CONFIGURATION); 895 vmstate_save_state(f, &vmstate_configuration, &savevm_state, 0); 896 } 897 898 } 899 900 void qemu_savevm_state_begin(QEMUFile *f, 901 const MigrationParams *params) 902 { 903 SaveStateEntry *se; 904 int ret; 905 906 trace_savevm_state_begin(); 907 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 908 if (!se->ops || !se->ops->set_params) { 909 continue; 910 } 911 se->ops->set_params(params, se->opaque); 912 } 913 914 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 915 if (!se->ops || !se->ops->save_live_setup) { 916 continue; 917 } 918 if (se->ops && se->ops->is_active) { 919 if (!se->ops->is_active(se->opaque)) { 920 continue; 921 } 922 } 923 save_section_header(f, se, QEMU_VM_SECTION_START); 924 925 ret = se->ops->save_live_setup(f, se->opaque); 926 save_section_footer(f, se); 927 if (ret < 0) { 928 qemu_file_set_error(f, ret); 929 break; 930 } 931 } 932 } 933 934 /* 935 * this function has three return values: 936 * negative: there was one error, and we have -errno. 937 * 0 : We haven't finished, caller have to go again 938 * 1 : We have finished, we can go to complete phase 939 */ 940 int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy) 941 { 942 SaveStateEntry *se; 943 int ret = 1; 944 945 trace_savevm_state_iterate(); 946 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 947 if (!se->ops || !se->ops->save_live_iterate) { 948 continue; 949 } 950 if (se->ops && se->ops->is_active) { 951 if (!se->ops->is_active(se->opaque)) { 952 continue; 953 } 954 } 955 /* 956 * In the postcopy phase, any device that doesn't know how to 957 * do postcopy should have saved it's state in the _complete 958 * call that's already run, it might get confused if we call 959 * iterate afterwards. 960 */ 961 if (postcopy && !se->ops->save_live_complete_postcopy) { 962 continue; 963 } 964 if (qemu_file_rate_limit(f)) { 965 return 0; 966 } 967 trace_savevm_section_start(se->idstr, se->section_id); 968 969 save_section_header(f, se, QEMU_VM_SECTION_PART); 970 971 ret = se->ops->save_live_iterate(f, se->opaque); 972 trace_savevm_section_end(se->idstr, se->section_id, ret); 973 save_section_footer(f, se); 974 975 if (ret < 0) { 976 qemu_file_set_error(f, ret); 977 } 978 if (ret <= 0) { 979 /* Do not proceed to the next vmstate before this one reported 980 completion of the current stage. This serializes the migration 981 and reduces the probability that a faster changing state is 982 synchronized over and over again. */ 983 break; 984 } 985 } 986 return ret; 987 } 988 989 static bool should_send_vmdesc(void) 990 { 991 MachineState *machine = MACHINE(qdev_get_machine()); 992 bool in_postcopy = migration_in_postcopy(migrate_get_current()); 993 return !machine->suppress_vmdesc && !in_postcopy; 994 } 995 996 /* 997 * Calls the save_live_complete_postcopy methods 998 * causing the last few pages to be sent immediately and doing any associated 999 * cleanup. 1000 * Note postcopy also calls qemu_savevm_state_complete_precopy to complete 1001 * all the other devices, but that happens at the point we switch to postcopy. 1002 */ 1003 void qemu_savevm_state_complete_postcopy(QEMUFile *f) 1004 { 1005 SaveStateEntry *se; 1006 int ret; 1007 1008 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1009 if (!se->ops || !se->ops->save_live_complete_postcopy) { 1010 continue; 1011 } 1012 if (se->ops && se->ops->is_active) { 1013 if (!se->ops->is_active(se->opaque)) { 1014 continue; 1015 } 1016 } 1017 trace_savevm_section_start(se->idstr, se->section_id); 1018 /* Section type */ 1019 qemu_put_byte(f, QEMU_VM_SECTION_END); 1020 qemu_put_be32(f, se->section_id); 1021 1022 ret = se->ops->save_live_complete_postcopy(f, se->opaque); 1023 trace_savevm_section_end(se->idstr, se->section_id, ret); 1024 save_section_footer(f, se); 1025 if (ret < 0) { 1026 qemu_file_set_error(f, ret); 1027 return; 1028 } 1029 } 1030 1031 qemu_put_byte(f, QEMU_VM_EOF); 1032 qemu_fflush(f); 1033 } 1034 1035 void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only) 1036 { 1037 QJSON *vmdesc; 1038 int vmdesc_len; 1039 SaveStateEntry *se; 1040 int ret; 1041 bool in_postcopy = migration_in_postcopy(migrate_get_current()); 1042 1043 trace_savevm_state_complete_precopy(); 1044 1045 cpu_synchronize_all_states(); 1046 1047 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1048 if (!se->ops || 1049 (in_postcopy && se->ops->save_live_complete_postcopy) || 1050 (in_postcopy && !iterable_only) || 1051 !se->ops->save_live_complete_precopy) { 1052 continue; 1053 } 1054 1055 if (se->ops && se->ops->is_active) { 1056 if (!se->ops->is_active(se->opaque)) { 1057 continue; 1058 } 1059 } 1060 trace_savevm_section_start(se->idstr, se->section_id); 1061 1062 save_section_header(f, se, QEMU_VM_SECTION_END); 1063 1064 ret = se->ops->save_live_complete_precopy(f, se->opaque); 1065 trace_savevm_section_end(se->idstr, se->section_id, ret); 1066 save_section_footer(f, se); 1067 if (ret < 0) { 1068 qemu_file_set_error(f, ret); 1069 return; 1070 } 1071 } 1072 1073 if (iterable_only) { 1074 return; 1075 } 1076 1077 vmdesc = qjson_new(); 1078 json_prop_int(vmdesc, "page_size", TARGET_PAGE_SIZE); 1079 json_start_array(vmdesc, "devices"); 1080 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1081 1082 if ((!se->ops || !se->ops->save_state) && !se->vmsd) { 1083 continue; 1084 } 1085 if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { 1086 trace_savevm_section_skip(se->idstr, se->section_id); 1087 continue; 1088 } 1089 1090 trace_savevm_section_start(se->idstr, se->section_id); 1091 1092 json_start_object(vmdesc, NULL); 1093 json_prop_str(vmdesc, "name", se->idstr); 1094 json_prop_int(vmdesc, "instance_id", se->instance_id); 1095 1096 save_section_header(f, se, QEMU_VM_SECTION_FULL); 1097 vmstate_save(f, se, vmdesc); 1098 trace_savevm_section_end(se->idstr, se->section_id, 0); 1099 save_section_footer(f, se); 1100 1101 json_end_object(vmdesc); 1102 } 1103 1104 if (!in_postcopy) { 1105 /* Postcopy stream will still be going */ 1106 qemu_put_byte(f, QEMU_VM_EOF); 1107 } 1108 1109 json_end_array(vmdesc); 1110 qjson_finish(vmdesc); 1111 vmdesc_len = strlen(qjson_get_str(vmdesc)); 1112 1113 if (should_send_vmdesc()) { 1114 qemu_put_byte(f, QEMU_VM_VMDESCRIPTION); 1115 qemu_put_be32(f, vmdesc_len); 1116 qemu_put_buffer(f, (uint8_t *)qjson_get_str(vmdesc), vmdesc_len); 1117 } 1118 object_unref(OBJECT(vmdesc)); 1119 1120 qemu_fflush(f); 1121 } 1122 1123 /* Give an estimate of the amount left to be transferred, 1124 * the result is split into the amount for units that can and 1125 * for units that can't do postcopy. 1126 */ 1127 void qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size, 1128 uint64_t *res_non_postcopiable, 1129 uint64_t *res_postcopiable) 1130 { 1131 SaveStateEntry *se; 1132 1133 *res_non_postcopiable = 0; 1134 *res_postcopiable = 0; 1135 1136 1137 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1138 if (!se->ops || !se->ops->save_live_pending) { 1139 continue; 1140 } 1141 if (se->ops && se->ops->is_active) { 1142 if (!se->ops->is_active(se->opaque)) { 1143 continue; 1144 } 1145 } 1146 se->ops->save_live_pending(f, se->opaque, max_size, 1147 res_non_postcopiable, res_postcopiable); 1148 } 1149 } 1150 1151 void qemu_savevm_state_cleanup(void) 1152 { 1153 SaveStateEntry *se; 1154 1155 trace_savevm_state_cleanup(); 1156 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1157 if (se->ops && se->ops->cleanup) { 1158 se->ops->cleanup(se->opaque); 1159 } 1160 } 1161 } 1162 1163 static int qemu_savevm_state(QEMUFile *f, Error **errp) 1164 { 1165 int ret; 1166 MigrationParams params = { 1167 .blk = 0, 1168 .shared = 0 1169 }; 1170 MigrationState *ms = migrate_init(¶ms); 1171 ms->to_dst_file = f; 1172 1173 if (qemu_savevm_state_blocked(errp)) { 1174 return -EINVAL; 1175 } 1176 1177 qemu_mutex_unlock_iothread(); 1178 qemu_savevm_state_header(f); 1179 qemu_savevm_state_begin(f, ¶ms); 1180 qemu_mutex_lock_iothread(); 1181 1182 while (qemu_file_get_error(f) == 0) { 1183 if (qemu_savevm_state_iterate(f, false) > 0) { 1184 break; 1185 } 1186 } 1187 1188 ret = qemu_file_get_error(f); 1189 if (ret == 0) { 1190 qemu_savevm_state_complete_precopy(f, false); 1191 ret = qemu_file_get_error(f); 1192 } 1193 qemu_savevm_state_cleanup(); 1194 if (ret != 0) { 1195 error_setg_errno(errp, -ret, "Error while writing VM state"); 1196 } 1197 return ret; 1198 } 1199 1200 static int qemu_save_device_state(QEMUFile *f) 1201 { 1202 SaveStateEntry *se; 1203 1204 qemu_put_be32(f, QEMU_VM_FILE_MAGIC); 1205 qemu_put_be32(f, QEMU_VM_FILE_VERSION); 1206 1207 cpu_synchronize_all_states(); 1208 1209 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1210 if (se->is_ram) { 1211 continue; 1212 } 1213 if ((!se->ops || !se->ops->save_state) && !se->vmsd) { 1214 continue; 1215 } 1216 if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { 1217 continue; 1218 } 1219 1220 save_section_header(f, se, QEMU_VM_SECTION_FULL); 1221 1222 vmstate_save(f, se, NULL); 1223 1224 save_section_footer(f, se); 1225 } 1226 1227 qemu_put_byte(f, QEMU_VM_EOF); 1228 1229 return qemu_file_get_error(f); 1230 } 1231 1232 static SaveStateEntry *find_se(const char *idstr, int instance_id) 1233 { 1234 SaveStateEntry *se; 1235 1236 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1237 if (!strcmp(se->idstr, idstr) && 1238 (instance_id == se->instance_id || 1239 instance_id == se->alias_id)) 1240 return se; 1241 /* Migrating from an older version? */ 1242 if (strstr(se->idstr, idstr) && se->compat) { 1243 if (!strcmp(se->compat->idstr, idstr) && 1244 (instance_id == se->compat->instance_id || 1245 instance_id == se->alias_id)) 1246 return se; 1247 } 1248 } 1249 return NULL; 1250 } 1251 1252 enum LoadVMExitCodes { 1253 /* Allow a command to quit all layers of nested loadvm loops */ 1254 LOADVM_QUIT = 1, 1255 }; 1256 1257 static int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis); 1258 1259 /* ------ incoming postcopy messages ------ */ 1260 /* 'advise' arrives before any transfers just to tell us that a postcopy 1261 * *might* happen - it might be skipped if precopy transferred everything 1262 * quickly. 1263 */ 1264 static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis) 1265 { 1266 PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_ADVISE); 1267 uint64_t remote_hps, remote_tps; 1268 1269 trace_loadvm_postcopy_handle_advise(); 1270 if (ps != POSTCOPY_INCOMING_NONE) { 1271 error_report("CMD_POSTCOPY_ADVISE in wrong postcopy state (%d)", ps); 1272 return -1; 1273 } 1274 1275 if (!postcopy_ram_supported_by_host()) { 1276 return -1; 1277 } 1278 1279 remote_hps = qemu_get_be64(mis->from_src_file); 1280 if (remote_hps != getpagesize()) { 1281 /* 1282 * Some combinations of mismatch are probably possible but it gets 1283 * a bit more complicated. In particular we need to place whole 1284 * host pages on the dest at once, and we need to ensure that we 1285 * handle dirtying to make sure we never end up sending part of 1286 * a hostpage on it's own. 1287 */ 1288 error_report("Postcopy needs matching host page sizes (s=%d d=%d)", 1289 (int)remote_hps, getpagesize()); 1290 return -1; 1291 } 1292 1293 remote_tps = qemu_get_be64(mis->from_src_file); 1294 if (remote_tps != (1ul << qemu_target_page_bits())) { 1295 /* 1296 * Again, some differences could be dealt with, but for now keep it 1297 * simple. 1298 */ 1299 error_report("Postcopy needs matching target page sizes (s=%d d=%d)", 1300 (int)remote_tps, 1 << qemu_target_page_bits()); 1301 return -1; 1302 } 1303 1304 if (ram_postcopy_incoming_init(mis)) { 1305 return -1; 1306 } 1307 1308 postcopy_state_set(POSTCOPY_INCOMING_ADVISE); 1309 1310 return 0; 1311 } 1312 1313 /* After postcopy we will be told to throw some pages away since they're 1314 * dirty and will have to be demand fetched. Must happen before CPU is 1315 * started. 1316 * There can be 0..many of these messages, each encoding multiple pages. 1317 */ 1318 static int loadvm_postcopy_ram_handle_discard(MigrationIncomingState *mis, 1319 uint16_t len) 1320 { 1321 int tmp; 1322 char ramid[256]; 1323 PostcopyState ps = postcopy_state_get(); 1324 1325 trace_loadvm_postcopy_ram_handle_discard(); 1326 1327 switch (ps) { 1328 case POSTCOPY_INCOMING_ADVISE: 1329 /* 1st discard */ 1330 tmp = postcopy_ram_prepare_discard(mis); 1331 if (tmp) { 1332 return tmp; 1333 } 1334 break; 1335 1336 case POSTCOPY_INCOMING_DISCARD: 1337 /* Expected state */ 1338 break; 1339 1340 default: 1341 error_report("CMD_POSTCOPY_RAM_DISCARD in wrong postcopy state (%d)", 1342 ps); 1343 return -1; 1344 } 1345 /* We're expecting a 1346 * Version (0) 1347 * a RAM ID string (length byte, name, 0 term) 1348 * then at least 1 16 byte chunk 1349 */ 1350 if (len < (1 + 1 + 1 + 1 + 2 * 8)) { 1351 error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); 1352 return -1; 1353 } 1354 1355 tmp = qemu_get_byte(mis->from_src_file); 1356 if (tmp != postcopy_ram_discard_version) { 1357 error_report("CMD_POSTCOPY_RAM_DISCARD invalid version (%d)", tmp); 1358 return -1; 1359 } 1360 1361 if (!qemu_get_counted_string(mis->from_src_file, ramid)) { 1362 error_report("CMD_POSTCOPY_RAM_DISCARD Failed to read RAMBlock ID"); 1363 return -1; 1364 } 1365 tmp = qemu_get_byte(mis->from_src_file); 1366 if (tmp != 0) { 1367 error_report("CMD_POSTCOPY_RAM_DISCARD missing nil (%d)", tmp); 1368 return -1; 1369 } 1370 1371 len -= 3 + strlen(ramid); 1372 if (len % 16) { 1373 error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); 1374 return -1; 1375 } 1376 trace_loadvm_postcopy_ram_handle_discard_header(ramid, len); 1377 while (len) { 1378 uint64_t start_addr, block_length; 1379 start_addr = qemu_get_be64(mis->from_src_file); 1380 block_length = qemu_get_be64(mis->from_src_file); 1381 1382 len -= 16; 1383 int ret = ram_discard_range(mis, ramid, start_addr, 1384 block_length); 1385 if (ret) { 1386 return ret; 1387 } 1388 } 1389 trace_loadvm_postcopy_ram_handle_discard_end(); 1390 1391 return 0; 1392 } 1393 1394 /* 1395 * Triggered by a postcopy_listen command; this thread takes over reading 1396 * the input stream, leaving the main thread free to carry on loading the rest 1397 * of the device state (from RAM). 1398 * (TODO:This could do with being in a postcopy file - but there again it's 1399 * just another input loop, not that postcopy specific) 1400 */ 1401 static void *postcopy_ram_listen_thread(void *opaque) 1402 { 1403 QEMUFile *f = opaque; 1404 MigrationIncomingState *mis = migration_incoming_get_current(); 1405 int load_res; 1406 1407 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, 1408 MIGRATION_STATUS_POSTCOPY_ACTIVE); 1409 qemu_sem_post(&mis->listen_thread_sem); 1410 trace_postcopy_ram_listen_thread_start(); 1411 1412 /* 1413 * Because we're a thread and not a coroutine we can't yield 1414 * in qemu_file, and thus we must be blocking now. 1415 */ 1416 qemu_file_set_blocking(f, true); 1417 load_res = qemu_loadvm_state_main(f, mis); 1418 /* And non-blocking again so we don't block in any cleanup */ 1419 qemu_file_set_blocking(f, false); 1420 1421 trace_postcopy_ram_listen_thread_exit(); 1422 if (load_res < 0) { 1423 error_report("%s: loadvm failed: %d", __func__, load_res); 1424 qemu_file_set_error(f, load_res); 1425 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 1426 MIGRATION_STATUS_FAILED); 1427 } else { 1428 /* 1429 * This looks good, but it's possible that the device loading in the 1430 * main thread hasn't finished yet, and so we might not be in 'RUN' 1431 * state yet; wait for the end of the main thread. 1432 */ 1433 qemu_event_wait(&mis->main_thread_load_event); 1434 } 1435 postcopy_ram_incoming_cleanup(mis); 1436 1437 if (load_res < 0) { 1438 /* 1439 * If something went wrong then we have a bad state so exit; 1440 * depending how far we got it might be possible at this point 1441 * to leave the guest running and fire MCEs for pages that never 1442 * arrived as a desperate recovery step. 1443 */ 1444 exit(EXIT_FAILURE); 1445 } 1446 1447 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 1448 MIGRATION_STATUS_COMPLETED); 1449 /* 1450 * If everything has worked fine, then the main thread has waited 1451 * for us to start, and we're the last use of the mis. 1452 * (If something broke then qemu will have to exit anyway since it's 1453 * got a bad migration state). 1454 */ 1455 migration_incoming_state_destroy(); 1456 1457 1458 return NULL; 1459 } 1460 1461 /* After this message we must be able to immediately receive postcopy data */ 1462 static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis) 1463 { 1464 PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_LISTENING); 1465 trace_loadvm_postcopy_handle_listen(); 1466 if (ps != POSTCOPY_INCOMING_ADVISE && ps != POSTCOPY_INCOMING_DISCARD) { 1467 error_report("CMD_POSTCOPY_LISTEN in wrong postcopy state (%d)", ps); 1468 return -1; 1469 } 1470 if (ps == POSTCOPY_INCOMING_ADVISE) { 1471 /* 1472 * A rare case, we entered listen without having to do any discards, 1473 * so do the setup that's normally done at the time of the 1st discard. 1474 */ 1475 postcopy_ram_prepare_discard(mis); 1476 } 1477 1478 /* 1479 * Sensitise RAM - can now generate requests for blocks that don't exist 1480 * However, at this point the CPU shouldn't be running, and the IO 1481 * shouldn't be doing anything yet so don't actually expect requests 1482 */ 1483 if (postcopy_ram_enable_notify(mis)) { 1484 return -1; 1485 } 1486 1487 if (mis->have_listen_thread) { 1488 error_report("CMD_POSTCOPY_RAM_LISTEN already has a listen thread"); 1489 return -1; 1490 } 1491 1492 mis->have_listen_thread = true; 1493 /* Start up the listening thread and wait for it to signal ready */ 1494 qemu_sem_init(&mis->listen_thread_sem, 0); 1495 qemu_thread_create(&mis->listen_thread, "postcopy/listen", 1496 postcopy_ram_listen_thread, mis->from_src_file, 1497 QEMU_THREAD_JOINABLE); 1498 qemu_sem_wait(&mis->listen_thread_sem); 1499 qemu_sem_destroy(&mis->listen_thread_sem); 1500 1501 return 0; 1502 } 1503 1504 static void loadvm_postcopy_handle_run_bh(void *opaque) 1505 { 1506 Error *local_err = NULL; 1507 MigrationIncomingState *mis = opaque; 1508 1509 /* TODO we should move all of this lot into postcopy_ram.c or a shared code 1510 * in migration.c 1511 */ 1512 cpu_synchronize_all_post_init(); 1513 1514 qemu_announce_self(); 1515 1516 /* Make sure all file formats flush their mutable metadata */ 1517 bdrv_invalidate_cache_all(&local_err); 1518 if (local_err) { 1519 error_report_err(local_err); 1520 } 1521 1522 trace_loadvm_postcopy_handle_run_cpu_sync(); 1523 cpu_synchronize_all_post_init(); 1524 1525 trace_loadvm_postcopy_handle_run_vmstart(); 1526 1527 if (autostart) { 1528 /* Hold onto your hats, starting the CPU */ 1529 vm_start(); 1530 } else { 1531 /* leave it paused and let management decide when to start the CPU */ 1532 runstate_set(RUN_STATE_PAUSED); 1533 } 1534 1535 qemu_bh_delete(mis->bh); 1536 } 1537 1538 /* After all discards we can start running and asking for pages */ 1539 static int loadvm_postcopy_handle_run(MigrationIncomingState *mis) 1540 { 1541 PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_RUNNING); 1542 1543 trace_loadvm_postcopy_handle_run(); 1544 if (ps != POSTCOPY_INCOMING_LISTENING) { 1545 error_report("CMD_POSTCOPY_RUN in wrong postcopy state (%d)", ps); 1546 return -1; 1547 } 1548 1549 mis->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, NULL); 1550 qemu_bh_schedule(mis->bh); 1551 1552 /* We need to finish reading the stream from the package 1553 * and also stop reading anything more from the stream that loaded the 1554 * package (since it's now being read by the listener thread). 1555 * LOADVM_QUIT will quit all the layers of nested loadvm loops. 1556 */ 1557 return LOADVM_QUIT; 1558 } 1559 1560 /** 1561 * Immediately following this command is a blob of data containing an embedded 1562 * chunk of migration stream; read it and load it. 1563 * 1564 * @mis: Incoming state 1565 * @length: Length of packaged data to read 1566 * 1567 * Returns: Negative values on error 1568 * 1569 */ 1570 static int loadvm_handle_cmd_packaged(MigrationIncomingState *mis) 1571 { 1572 int ret; 1573 uint8_t *buffer; 1574 uint32_t length; 1575 QEMUSizedBuffer *qsb; 1576 1577 length = qemu_get_be32(mis->from_src_file); 1578 trace_loadvm_handle_cmd_packaged(length); 1579 1580 if (length > MAX_VM_CMD_PACKAGED_SIZE) { 1581 error_report("Unreasonably large packaged state: %u", length); 1582 return -1; 1583 } 1584 buffer = g_malloc0(length); 1585 ret = qemu_get_buffer(mis->from_src_file, buffer, (int)length); 1586 if (ret != length) { 1587 g_free(buffer); 1588 error_report("CMD_PACKAGED: Buffer receive fail ret=%d length=%d", 1589 ret, length); 1590 return (ret < 0) ? ret : -EAGAIN; 1591 } 1592 trace_loadvm_handle_cmd_packaged_received(ret); 1593 1594 /* Setup a dummy QEMUFile that actually reads from the buffer */ 1595 qsb = qsb_create(buffer, length); 1596 g_free(buffer); /* Because qsb_create copies */ 1597 if (!qsb) { 1598 error_report("Unable to create qsb"); 1599 } 1600 QEMUFile *packf = qemu_bufopen("r", qsb); 1601 1602 ret = qemu_loadvm_state_main(packf, mis); 1603 trace_loadvm_handle_cmd_packaged_main(ret); 1604 qemu_fclose(packf); 1605 qsb_free(qsb); 1606 1607 return ret; 1608 } 1609 1610 /* 1611 * Process an incoming 'QEMU_VM_COMMAND' 1612 * 0 just a normal return 1613 * LOADVM_QUIT All good, but exit the loop 1614 * <0 Error 1615 */ 1616 static int loadvm_process_command(QEMUFile *f) 1617 { 1618 MigrationIncomingState *mis = migration_incoming_get_current(); 1619 uint16_t cmd; 1620 uint16_t len; 1621 uint32_t tmp32; 1622 1623 cmd = qemu_get_be16(f); 1624 len = qemu_get_be16(f); 1625 1626 trace_loadvm_process_command(cmd, len); 1627 if (cmd >= MIG_CMD_MAX || cmd == MIG_CMD_INVALID) { 1628 error_report("MIG_CMD 0x%x unknown (len 0x%x)", cmd, len); 1629 return -EINVAL; 1630 } 1631 1632 if (mig_cmd_args[cmd].len != -1 && mig_cmd_args[cmd].len != len) { 1633 error_report("%s received with bad length - expecting %zu, got %d", 1634 mig_cmd_args[cmd].name, 1635 (size_t)mig_cmd_args[cmd].len, len); 1636 return -ERANGE; 1637 } 1638 1639 switch (cmd) { 1640 case MIG_CMD_OPEN_RETURN_PATH: 1641 if (mis->to_src_file) { 1642 error_report("CMD_OPEN_RETURN_PATH called when RP already open"); 1643 /* Not really a problem, so don't give up */ 1644 return 0; 1645 } 1646 mis->to_src_file = qemu_file_get_return_path(f); 1647 if (!mis->to_src_file) { 1648 error_report("CMD_OPEN_RETURN_PATH failed"); 1649 return -1; 1650 } 1651 break; 1652 1653 case MIG_CMD_PING: 1654 tmp32 = qemu_get_be32(f); 1655 trace_loadvm_process_command_ping(tmp32); 1656 if (!mis->to_src_file) { 1657 error_report("CMD_PING (0x%x) received with no return path", 1658 tmp32); 1659 return -1; 1660 } 1661 migrate_send_rp_pong(mis, tmp32); 1662 break; 1663 1664 case MIG_CMD_PACKAGED: 1665 return loadvm_handle_cmd_packaged(mis); 1666 1667 case MIG_CMD_POSTCOPY_ADVISE: 1668 return loadvm_postcopy_handle_advise(mis); 1669 1670 case MIG_CMD_POSTCOPY_LISTEN: 1671 return loadvm_postcopy_handle_listen(mis); 1672 1673 case MIG_CMD_POSTCOPY_RUN: 1674 return loadvm_postcopy_handle_run(mis); 1675 1676 case MIG_CMD_POSTCOPY_RAM_DISCARD: 1677 return loadvm_postcopy_ram_handle_discard(mis, len); 1678 } 1679 1680 return 0; 1681 } 1682 1683 struct LoadStateEntry { 1684 QLIST_ENTRY(LoadStateEntry) entry; 1685 SaveStateEntry *se; 1686 int section_id; 1687 int version_id; 1688 }; 1689 1690 /* 1691 * Read a footer off the wire and check that it matches the expected section 1692 * 1693 * Returns: true if the footer was good 1694 * false if there is a problem (and calls error_report to say why) 1695 */ 1696 static bool check_section_footer(QEMUFile *f, LoadStateEntry *le) 1697 { 1698 uint8_t read_mark; 1699 uint32_t read_section_id; 1700 1701 if (skip_section_footers) { 1702 /* No footer to check */ 1703 return true; 1704 } 1705 1706 read_mark = qemu_get_byte(f); 1707 1708 if (read_mark != QEMU_VM_SECTION_FOOTER) { 1709 error_report("Missing section footer for %s", le->se->idstr); 1710 return false; 1711 } 1712 1713 read_section_id = qemu_get_be32(f); 1714 if (read_section_id != le->section_id) { 1715 error_report("Mismatched section id in footer for %s -" 1716 " read 0x%x expected 0x%x", 1717 le->se->idstr, read_section_id, le->section_id); 1718 return false; 1719 } 1720 1721 /* All good */ 1722 return true; 1723 } 1724 1725 void loadvm_free_handlers(MigrationIncomingState *mis) 1726 { 1727 LoadStateEntry *le, *new_le; 1728 1729 QLIST_FOREACH_SAFE(le, &mis->loadvm_handlers, entry, new_le) { 1730 QLIST_REMOVE(le, entry); 1731 g_free(le); 1732 } 1733 } 1734 1735 static int 1736 qemu_loadvm_section_start_full(QEMUFile *f, MigrationIncomingState *mis) 1737 { 1738 uint32_t instance_id, version_id, section_id; 1739 SaveStateEntry *se; 1740 LoadStateEntry *le; 1741 char idstr[256]; 1742 int ret; 1743 1744 /* Read section start */ 1745 section_id = qemu_get_be32(f); 1746 if (!qemu_get_counted_string(f, idstr)) { 1747 error_report("Unable to read ID string for section %u", 1748 section_id); 1749 return -EINVAL; 1750 } 1751 instance_id = qemu_get_be32(f); 1752 version_id = qemu_get_be32(f); 1753 1754 trace_qemu_loadvm_state_section_startfull(section_id, idstr, 1755 instance_id, version_id); 1756 /* Find savevm section */ 1757 se = find_se(idstr, instance_id); 1758 if (se == NULL) { 1759 error_report("Unknown savevm section or instance '%s' %d", 1760 idstr, instance_id); 1761 return -EINVAL; 1762 } 1763 1764 /* Validate version */ 1765 if (version_id > se->version_id) { 1766 error_report("savevm: unsupported version %d for '%s' v%d", 1767 version_id, idstr, se->version_id); 1768 return -EINVAL; 1769 } 1770 1771 /* Add entry */ 1772 le = g_malloc0(sizeof(*le)); 1773 1774 le->se = se; 1775 le->section_id = section_id; 1776 le->version_id = version_id; 1777 QLIST_INSERT_HEAD(&mis->loadvm_handlers, le, entry); 1778 1779 ret = vmstate_load(f, le->se, le->version_id); 1780 if (ret < 0) { 1781 error_report("error while loading state for instance 0x%x of" 1782 " device '%s'", instance_id, idstr); 1783 return ret; 1784 } 1785 if (!check_section_footer(f, le)) { 1786 return -EINVAL; 1787 } 1788 1789 return 0; 1790 } 1791 1792 static int 1793 qemu_loadvm_section_part_end(QEMUFile *f, MigrationIncomingState *mis) 1794 { 1795 uint32_t section_id; 1796 LoadStateEntry *le; 1797 int ret; 1798 1799 section_id = qemu_get_be32(f); 1800 1801 trace_qemu_loadvm_state_section_partend(section_id); 1802 QLIST_FOREACH(le, &mis->loadvm_handlers, entry) { 1803 if (le->section_id == section_id) { 1804 break; 1805 } 1806 } 1807 if (le == NULL) { 1808 error_report("Unknown savevm section %d", section_id); 1809 return -EINVAL; 1810 } 1811 1812 ret = vmstate_load(f, le->se, le->version_id); 1813 if (ret < 0) { 1814 error_report("error while loading state section id %d(%s)", 1815 section_id, le->se->idstr); 1816 return ret; 1817 } 1818 if (!check_section_footer(f, le)) { 1819 return -EINVAL; 1820 } 1821 1822 return 0; 1823 } 1824 1825 static int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis) 1826 { 1827 uint8_t section_type; 1828 int ret; 1829 1830 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) { 1831 1832 trace_qemu_loadvm_state_section(section_type); 1833 switch (section_type) { 1834 case QEMU_VM_SECTION_START: 1835 case QEMU_VM_SECTION_FULL: 1836 ret = qemu_loadvm_section_start_full(f, mis); 1837 if (ret < 0) { 1838 return ret; 1839 } 1840 break; 1841 case QEMU_VM_SECTION_PART: 1842 case QEMU_VM_SECTION_END: 1843 ret = qemu_loadvm_section_part_end(f, mis); 1844 if (ret < 0) { 1845 return ret; 1846 } 1847 break; 1848 case QEMU_VM_COMMAND: 1849 ret = loadvm_process_command(f); 1850 trace_qemu_loadvm_state_section_command(ret); 1851 if ((ret < 0) || (ret & LOADVM_QUIT)) { 1852 return ret; 1853 } 1854 break; 1855 default: 1856 error_report("Unknown savevm section type %d", section_type); 1857 return -EINVAL; 1858 } 1859 } 1860 1861 return 0; 1862 } 1863 1864 int qemu_loadvm_state(QEMUFile *f) 1865 { 1866 MigrationIncomingState *mis = migration_incoming_get_current(); 1867 Error *local_err = NULL; 1868 unsigned int v; 1869 int ret; 1870 1871 if (qemu_savevm_state_blocked(&local_err)) { 1872 error_report_err(local_err); 1873 return -EINVAL; 1874 } 1875 1876 v = qemu_get_be32(f); 1877 if (v != QEMU_VM_FILE_MAGIC) { 1878 error_report("Not a migration stream"); 1879 return -EINVAL; 1880 } 1881 1882 v = qemu_get_be32(f); 1883 if (v == QEMU_VM_FILE_VERSION_COMPAT) { 1884 error_report("SaveVM v2 format is obsolete and don't work anymore"); 1885 return -ENOTSUP; 1886 } 1887 if (v != QEMU_VM_FILE_VERSION) { 1888 error_report("Unsupported migration stream version"); 1889 return -ENOTSUP; 1890 } 1891 1892 if (!savevm_state.skip_configuration || enforce_config_section()) { 1893 if (qemu_get_byte(f) != QEMU_VM_CONFIGURATION) { 1894 error_report("Configuration section missing"); 1895 return -EINVAL; 1896 } 1897 ret = vmstate_load_state(f, &vmstate_configuration, &savevm_state, 0); 1898 1899 if (ret) { 1900 return ret; 1901 } 1902 } 1903 1904 ret = qemu_loadvm_state_main(f, mis); 1905 qemu_event_set(&mis->main_thread_load_event); 1906 1907 trace_qemu_loadvm_state_post_main(ret); 1908 1909 if (mis->have_listen_thread) { 1910 /* Listen thread still going, can't clean up yet */ 1911 return ret; 1912 } 1913 1914 if (ret == 0) { 1915 ret = qemu_file_get_error(f); 1916 } 1917 1918 /* 1919 * Try to read in the VMDESC section as well, so that dumping tools that 1920 * intercept our migration stream have the chance to see it. 1921 */ 1922 1923 /* We've got to be careful; if we don't read the data and just shut the fd 1924 * then the sender can error if we close while it's still sending. 1925 * We also mustn't read data that isn't there; some transports (RDMA) 1926 * will stall waiting for that data when the source has already closed. 1927 */ 1928 if (ret == 0 && should_send_vmdesc()) { 1929 uint8_t *buf; 1930 uint32_t size; 1931 uint8_t section_type = qemu_get_byte(f); 1932 1933 if (section_type != QEMU_VM_VMDESCRIPTION) { 1934 error_report("Expected vmdescription section, but got %d", 1935 section_type); 1936 /* 1937 * It doesn't seem worth failing at this point since 1938 * we apparently have an otherwise valid VM state 1939 */ 1940 } else { 1941 buf = g_malloc(0x1000); 1942 size = qemu_get_be32(f); 1943 1944 while (size > 0) { 1945 uint32_t read_chunk = MIN(size, 0x1000); 1946 qemu_get_buffer(f, buf, read_chunk); 1947 size -= read_chunk; 1948 } 1949 g_free(buf); 1950 } 1951 } 1952 1953 cpu_synchronize_all_post_init(); 1954 1955 return ret; 1956 } 1957 1958 void hmp_savevm(Monitor *mon, const QDict *qdict) 1959 { 1960 BlockDriverState *bs, *bs1; 1961 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1; 1962 int ret; 1963 QEMUFile *f; 1964 int saved_vm_running; 1965 uint64_t vm_state_size; 1966 qemu_timeval tv; 1967 struct tm tm; 1968 const char *name = qdict_get_try_str(qdict, "name"); 1969 Error *local_err = NULL; 1970 AioContext *aio_context; 1971 1972 if (!bdrv_all_can_snapshot(&bs)) { 1973 monitor_printf(mon, "Device '%s' is writable but does not " 1974 "support snapshots.\n", bdrv_get_device_name(bs)); 1975 return; 1976 } 1977 1978 /* Delete old snapshots of the same name */ 1979 if (name && bdrv_all_delete_snapshot(name, &bs1, &local_err) < 0) { 1980 error_reportf_err(local_err, 1981 "Error while deleting snapshot on device '%s': ", 1982 bdrv_get_device_name(bs1)); 1983 return; 1984 } 1985 1986 bs = bdrv_all_find_vmstate_bs(); 1987 if (bs == NULL) { 1988 monitor_printf(mon, "No block device can accept snapshots\n"); 1989 return; 1990 } 1991 aio_context = bdrv_get_aio_context(bs); 1992 1993 saved_vm_running = runstate_is_running(); 1994 1995 ret = global_state_store(); 1996 if (ret) { 1997 monitor_printf(mon, "Error saving global state\n"); 1998 return; 1999 } 2000 vm_stop(RUN_STATE_SAVE_VM); 2001 2002 aio_context_acquire(aio_context); 2003 2004 memset(sn, 0, sizeof(*sn)); 2005 2006 /* fill auxiliary fields */ 2007 qemu_gettimeofday(&tv); 2008 sn->date_sec = tv.tv_sec; 2009 sn->date_nsec = tv.tv_usec * 1000; 2010 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 2011 2012 if (name) { 2013 ret = bdrv_snapshot_find(bs, old_sn, name); 2014 if (ret >= 0) { 2015 pstrcpy(sn->name, sizeof(sn->name), old_sn->name); 2016 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str); 2017 } else { 2018 pstrcpy(sn->name, sizeof(sn->name), name); 2019 } 2020 } else { 2021 /* cast below needed for OpenBSD where tv_sec is still 'long' */ 2022 localtime_r((const time_t *)&tv.tv_sec, &tm); 2023 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm); 2024 } 2025 2026 /* save the VM state */ 2027 f = qemu_fopen_bdrv(bs, 1); 2028 if (!f) { 2029 monitor_printf(mon, "Could not open VM state file\n"); 2030 goto the_end; 2031 } 2032 ret = qemu_savevm_state(f, &local_err); 2033 vm_state_size = qemu_ftell(f); 2034 qemu_fclose(f); 2035 if (ret < 0) { 2036 error_report_err(local_err); 2037 goto the_end; 2038 } 2039 2040 ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, &bs); 2041 if (ret < 0) { 2042 monitor_printf(mon, "Error while creating snapshot on '%s'\n", 2043 bdrv_get_device_name(bs)); 2044 } 2045 2046 the_end: 2047 aio_context_release(aio_context); 2048 if (saved_vm_running) { 2049 vm_start(); 2050 } 2051 } 2052 2053 void qmp_xen_save_devices_state(const char *filename, Error **errp) 2054 { 2055 QEMUFile *f; 2056 int saved_vm_running; 2057 int ret; 2058 2059 saved_vm_running = runstate_is_running(); 2060 vm_stop(RUN_STATE_SAVE_VM); 2061 global_state_store_running(); 2062 2063 f = qemu_fopen(filename, "wb"); 2064 if (!f) { 2065 error_setg_file_open(errp, errno, filename); 2066 goto the_end; 2067 } 2068 ret = qemu_save_device_state(f); 2069 qemu_fclose(f); 2070 if (ret < 0) { 2071 error_setg(errp, QERR_IO_ERROR); 2072 } 2073 2074 the_end: 2075 if (saved_vm_running) { 2076 vm_start(); 2077 } 2078 } 2079 2080 int load_vmstate(const char *name) 2081 { 2082 BlockDriverState *bs, *bs_vm_state; 2083 QEMUSnapshotInfo sn; 2084 QEMUFile *f; 2085 int ret; 2086 AioContext *aio_context; 2087 2088 if (!bdrv_all_can_snapshot(&bs)) { 2089 error_report("Device '%s' is writable but does not support snapshots.", 2090 bdrv_get_device_name(bs)); 2091 return -ENOTSUP; 2092 } 2093 ret = bdrv_all_find_snapshot(name, &bs); 2094 if (ret < 0) { 2095 error_report("Device '%s' does not have the requested snapshot '%s'", 2096 bdrv_get_device_name(bs), name); 2097 return ret; 2098 } 2099 2100 bs_vm_state = bdrv_all_find_vmstate_bs(); 2101 if (!bs_vm_state) { 2102 error_report("No block device supports snapshots"); 2103 return -ENOTSUP; 2104 } 2105 aio_context = bdrv_get_aio_context(bs_vm_state); 2106 2107 /* Don't even try to load empty VM states */ 2108 aio_context_acquire(aio_context); 2109 ret = bdrv_snapshot_find(bs_vm_state, &sn, name); 2110 aio_context_release(aio_context); 2111 if (ret < 0) { 2112 return ret; 2113 } else if (sn.vm_state_size == 0) { 2114 error_report("This is a disk-only snapshot. Revert to it offline " 2115 "using qemu-img."); 2116 return -EINVAL; 2117 } 2118 2119 /* Flush all IO requests so they don't interfere with the new state. */ 2120 bdrv_drain_all(); 2121 2122 ret = bdrv_all_goto_snapshot(name, &bs); 2123 if (ret < 0) { 2124 error_report("Error %d while activating snapshot '%s' on '%s'", 2125 ret, name, bdrv_get_device_name(bs)); 2126 return ret; 2127 } 2128 2129 /* restore the VM state */ 2130 f = qemu_fopen_bdrv(bs_vm_state, 0); 2131 if (!f) { 2132 error_report("Could not open VM state file"); 2133 return -EINVAL; 2134 } 2135 2136 qemu_system_reset(VMRESET_SILENT); 2137 migration_incoming_state_new(f); 2138 2139 aio_context_acquire(aio_context); 2140 ret = qemu_loadvm_state(f); 2141 qemu_fclose(f); 2142 aio_context_release(aio_context); 2143 2144 migration_incoming_state_destroy(); 2145 if (ret < 0) { 2146 error_report("Error %d while loading VM state", ret); 2147 return ret; 2148 } 2149 2150 return 0; 2151 } 2152 2153 void hmp_delvm(Monitor *mon, const QDict *qdict) 2154 { 2155 BlockDriverState *bs; 2156 Error *err; 2157 const char *name = qdict_get_str(qdict, "name"); 2158 2159 if (bdrv_all_delete_snapshot(name, &bs, &err) < 0) { 2160 error_reportf_err(err, 2161 "Error while deleting snapshot on device '%s': ", 2162 bdrv_get_device_name(bs)); 2163 } 2164 } 2165 2166 void hmp_info_snapshots(Monitor *mon, const QDict *qdict) 2167 { 2168 BlockDriverState *bs, *bs1; 2169 QEMUSnapshotInfo *sn_tab, *sn; 2170 int nb_sns, i; 2171 int total; 2172 int *available_snapshots; 2173 AioContext *aio_context; 2174 2175 bs = bdrv_all_find_vmstate_bs(); 2176 if (!bs) { 2177 monitor_printf(mon, "No available block device supports snapshots\n"); 2178 return; 2179 } 2180 aio_context = bdrv_get_aio_context(bs); 2181 2182 aio_context_acquire(aio_context); 2183 nb_sns = bdrv_snapshot_list(bs, &sn_tab); 2184 aio_context_release(aio_context); 2185 2186 if (nb_sns < 0) { 2187 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns); 2188 return; 2189 } 2190 2191 if (nb_sns == 0) { 2192 monitor_printf(mon, "There is no snapshot available.\n"); 2193 return; 2194 } 2195 2196 available_snapshots = g_new0(int, nb_sns); 2197 total = 0; 2198 for (i = 0; i < nb_sns; i++) { 2199 if (bdrv_all_find_snapshot(sn_tab[i].id_str, &bs1) == 0) { 2200 available_snapshots[total] = i; 2201 total++; 2202 } 2203 } 2204 2205 if (total > 0) { 2206 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL); 2207 monitor_printf(mon, "\n"); 2208 for (i = 0; i < total; i++) { 2209 sn = &sn_tab[available_snapshots[i]]; 2210 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn); 2211 monitor_printf(mon, "\n"); 2212 } 2213 } else { 2214 monitor_printf(mon, "There is no suitable snapshot available\n"); 2215 } 2216 2217 g_free(sn_tab); 2218 g_free(available_snapshots); 2219 2220 } 2221 2222 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev) 2223 { 2224 qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK, 2225 memory_region_name(mr), dev); 2226 } 2227 2228 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev) 2229 { 2230 qemu_ram_unset_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK); 2231 } 2232 2233 void vmstate_register_ram_global(MemoryRegion *mr) 2234 { 2235 vmstate_register_ram(mr, NULL); 2236 } 2237