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 "hw/boards.h" 31 #include "hw/hw.h" 32 #include "hw/qdev.h" 33 #include "net/net.h" 34 #include "monitor/monitor.h" 35 #include "sysemu/sysemu.h" 36 #include "qemu/timer.h" 37 #include "audio/audio.h" 38 #include "migration/migration.h" 39 #include "migration/postcopy-ram.h" 40 #include "qapi/qmp/qerror.h" 41 #include "qemu/error-report.h" 42 #include "qemu/sockets.h" 43 #include "qemu/queue.h" 44 #include "sysemu/cpus.h" 45 #include "exec/memory.h" 46 #include "qmp-commands.h" 47 #include "trace.h" 48 #include "qemu/bitops.h" 49 #include "qemu/iov.h" 50 #include "block/snapshot.h" 51 #include "block/qapi.h" 52 #include "qemu/cutils.h" 53 54 #ifndef ETH_P_RARP 55 #define ETH_P_RARP 0x8035 56 #endif 57 #define ARP_HTYPE_ETH 0x0001 58 #define ARP_PTYPE_IP 0x0800 59 #define ARP_OP_REQUEST_REV 0x3 60 61 const unsigned int postcopy_ram_discard_version = 0; 62 63 static bool skip_section_footers; 64 65 static struct mig_cmd_args { 66 ssize_t len; /* -1 = variable */ 67 const char *name; 68 } mig_cmd_args[] = { 69 [MIG_CMD_INVALID] = { .len = -1, .name = "INVALID" }, 70 [MIG_CMD_OPEN_RETURN_PATH] = { .len = 0, .name = "OPEN_RETURN_PATH" }, 71 [MIG_CMD_PING] = { .len = sizeof(uint32_t), .name = "PING" }, 72 [MIG_CMD_POSTCOPY_ADVISE] = { .len = 16, .name = "POSTCOPY_ADVISE" }, 73 [MIG_CMD_POSTCOPY_LISTEN] = { .len = 0, .name = "POSTCOPY_LISTEN" }, 74 [MIG_CMD_POSTCOPY_RUN] = { .len = 0, .name = "POSTCOPY_RUN" }, 75 [MIG_CMD_POSTCOPY_RAM_DISCARD] = { 76 .len = -1, .name = "POSTCOPY_RAM_DISCARD" }, 77 [MIG_CMD_PACKAGED] = { .len = 4, .name = "PACKAGED" }, 78 [MIG_CMD_MAX] = { .len = -1, .name = "MAX" }, 79 }; 80 81 static int announce_self_create(uint8_t *buf, 82 uint8_t *mac_addr) 83 { 84 /* Ethernet header. */ 85 memset(buf, 0xff, 6); /* destination MAC addr */ 86 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */ 87 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */ 88 89 /* RARP header. */ 90 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */ 91 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */ 92 *(buf + 18) = 6; /* hardware addr length (ethernet) */ 93 *(buf + 19) = 4; /* protocol addr length (IPv4) */ 94 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */ 95 memcpy(buf + 22, mac_addr, 6); /* source hw addr */ 96 memset(buf + 28, 0x00, 4); /* source protocol addr */ 97 memcpy(buf + 32, mac_addr, 6); /* target hw addr */ 98 memset(buf + 38, 0x00, 4); /* target protocol addr */ 99 100 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */ 101 memset(buf + 42, 0x00, 18); 102 103 return 60; /* len (FCS will be added by hardware) */ 104 } 105 106 static void qemu_announce_self_iter(NICState *nic, void *opaque) 107 { 108 uint8_t buf[60]; 109 int len; 110 111 trace_qemu_announce_self_iter(qemu_ether_ntoa(&nic->conf->macaddr)); 112 len = announce_self_create(buf, nic->conf->macaddr.a); 113 114 qemu_send_packet_raw(qemu_get_queue(nic), buf, len); 115 } 116 117 118 static void qemu_announce_self_once(void *opaque) 119 { 120 static int count = SELF_ANNOUNCE_ROUNDS; 121 QEMUTimer *timer = *(QEMUTimer **)opaque; 122 123 qemu_foreach_nic(qemu_announce_self_iter, NULL); 124 125 if (--count) { 126 /* delay 50ms, 150ms, 250ms, ... */ 127 timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 128 self_announce_delay(count)); 129 } else { 130 timer_del(timer); 131 timer_free(timer); 132 } 133 } 134 135 void qemu_announce_self(void) 136 { 137 static QEMUTimer *timer; 138 timer = timer_new_ms(QEMU_CLOCK_REALTIME, qemu_announce_self_once, &timer); 139 qemu_announce_self_once(&timer); 140 } 141 142 /***********************************************************/ 143 /* savevm/loadvm support */ 144 145 static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt, 146 int64_t pos) 147 { 148 int ret; 149 QEMUIOVector qiov; 150 151 qemu_iovec_init_external(&qiov, iov, iovcnt); 152 ret = bdrv_writev_vmstate(opaque, &qiov, pos); 153 if (ret < 0) { 154 return ret; 155 } 156 157 return qiov.size; 158 } 159 160 static ssize_t block_put_buffer(void *opaque, const uint8_t *buf, 161 int64_t pos, size_t size) 162 { 163 bdrv_save_vmstate(opaque, buf, pos, size); 164 return size; 165 } 166 167 static ssize_t block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, 168 size_t size) 169 { 170 return bdrv_load_vmstate(opaque, buf, pos, size); 171 } 172 173 static int bdrv_fclose(void *opaque) 174 { 175 return bdrv_flush(opaque); 176 } 177 178 static const QEMUFileOps bdrv_read_ops = { 179 .get_buffer = block_get_buffer, 180 .close = bdrv_fclose 181 }; 182 183 static const QEMUFileOps bdrv_write_ops = { 184 .put_buffer = block_put_buffer, 185 .writev_buffer = block_writev_buffer, 186 .close = bdrv_fclose 187 }; 188 189 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable) 190 { 191 if (is_writable) { 192 return qemu_fopen_ops(bs, &bdrv_write_ops); 193 } 194 return qemu_fopen_ops(bs, &bdrv_read_ops); 195 } 196 197 198 /* QEMUFile timer support. 199 * Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c 200 */ 201 202 void timer_put(QEMUFile *f, QEMUTimer *ts) 203 { 204 uint64_t expire_time; 205 206 expire_time = timer_expire_time_ns(ts); 207 qemu_put_be64(f, expire_time); 208 } 209 210 void timer_get(QEMUFile *f, QEMUTimer *ts) 211 { 212 uint64_t expire_time; 213 214 expire_time = qemu_get_be64(f); 215 if (expire_time != -1) { 216 timer_mod_ns(ts, expire_time); 217 } else { 218 timer_del(ts); 219 } 220 } 221 222 223 /* VMState timer support. 224 * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c 225 */ 226 227 static int get_timer(QEMUFile *f, void *pv, size_t size) 228 { 229 QEMUTimer *v = pv; 230 timer_get(f, v); 231 return 0; 232 } 233 234 static void put_timer(QEMUFile *f, void *pv, size_t size) 235 { 236 QEMUTimer *v = pv; 237 timer_put(f, v); 238 } 239 240 const VMStateInfo vmstate_info_timer = { 241 .name = "timer", 242 .get = get_timer, 243 .put = put_timer, 244 }; 245 246 247 typedef struct CompatEntry { 248 char idstr[256]; 249 int instance_id; 250 } CompatEntry; 251 252 typedef struct SaveStateEntry { 253 QTAILQ_ENTRY(SaveStateEntry) entry; 254 char idstr[256]; 255 int instance_id; 256 int alias_id; 257 int version_id; 258 int section_id; 259 SaveVMHandlers *ops; 260 const VMStateDescription *vmsd; 261 void *opaque; 262 CompatEntry *compat; 263 int is_ram; 264 } SaveStateEntry; 265 266 typedef struct SaveState { 267 QTAILQ_HEAD(, SaveStateEntry) handlers; 268 int global_section_id; 269 bool skip_configuration; 270 uint32_t len; 271 const char *name; 272 } SaveState; 273 274 static SaveState savevm_state = { 275 .handlers = QTAILQ_HEAD_INITIALIZER(savevm_state.handlers), 276 .global_section_id = 0, 277 .skip_configuration = false, 278 }; 279 280 void savevm_skip_configuration(void) 281 { 282 savevm_state.skip_configuration = true; 283 } 284 285 286 static void configuration_pre_save(void *opaque) 287 { 288 SaveState *state = opaque; 289 const char *current_name = MACHINE_GET_CLASS(current_machine)->name; 290 291 state->len = strlen(current_name); 292 state->name = current_name; 293 } 294 295 static int configuration_post_load(void *opaque, int version_id) 296 { 297 SaveState *state = opaque; 298 const char *current_name = MACHINE_GET_CLASS(current_machine)->name; 299 300 if (strncmp(state->name, current_name, state->len) != 0) { 301 error_report("Machine type received is '%.*s' and local is '%s'", 302 (int) state->len, state->name, current_name); 303 return -EINVAL; 304 } 305 return 0; 306 } 307 308 static const VMStateDescription vmstate_configuration = { 309 .name = "configuration", 310 .version_id = 1, 311 .post_load = configuration_post_load, 312 .pre_save = configuration_pre_save, 313 .fields = (VMStateField[]) { 314 VMSTATE_UINT32(len, SaveState), 315 VMSTATE_VBUFFER_ALLOC_UINT32(name, SaveState, 0, NULL, 0, len), 316 VMSTATE_END_OF_LIST() 317 }, 318 }; 319 320 static void dump_vmstate_vmsd(FILE *out_file, 321 const VMStateDescription *vmsd, int indent, 322 bool is_subsection); 323 324 static void dump_vmstate_vmsf(FILE *out_file, const VMStateField *field, 325 int indent) 326 { 327 fprintf(out_file, "%*s{\n", indent, ""); 328 indent += 2; 329 fprintf(out_file, "%*s\"field\": \"%s\",\n", indent, "", field->name); 330 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", 331 field->version_id); 332 fprintf(out_file, "%*s\"field_exists\": %s,\n", indent, "", 333 field->field_exists ? "true" : "false"); 334 fprintf(out_file, "%*s\"size\": %zu", indent, "", field->size); 335 if (field->vmsd != NULL) { 336 fprintf(out_file, ",\n"); 337 dump_vmstate_vmsd(out_file, field->vmsd, indent, false); 338 } 339 fprintf(out_file, "\n%*s}", indent - 2, ""); 340 } 341 342 static void dump_vmstate_vmss(FILE *out_file, 343 const VMStateDescription **subsection, 344 int indent) 345 { 346 if (*subsection != NULL) { 347 dump_vmstate_vmsd(out_file, *subsection, indent, true); 348 } 349 } 350 351 static void dump_vmstate_vmsd(FILE *out_file, 352 const VMStateDescription *vmsd, int indent, 353 bool is_subsection) 354 { 355 if (is_subsection) { 356 fprintf(out_file, "%*s{\n", indent, ""); 357 } else { 358 fprintf(out_file, "%*s\"%s\": {\n", indent, "", "Description"); 359 } 360 indent += 2; 361 fprintf(out_file, "%*s\"name\": \"%s\",\n", indent, "", vmsd->name); 362 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", 363 vmsd->version_id); 364 fprintf(out_file, "%*s\"minimum_version_id\": %d", indent, "", 365 vmsd->minimum_version_id); 366 if (vmsd->fields != NULL) { 367 const VMStateField *field = vmsd->fields; 368 bool first; 369 370 fprintf(out_file, ",\n%*s\"Fields\": [\n", indent, ""); 371 first = true; 372 while (field->name != NULL) { 373 if (field->flags & VMS_MUST_EXIST) { 374 /* Ignore VMSTATE_VALIDATE bits; these don't get migrated */ 375 field++; 376 continue; 377 } 378 if (!first) { 379 fprintf(out_file, ",\n"); 380 } 381 dump_vmstate_vmsf(out_file, field, indent + 2); 382 field++; 383 first = false; 384 } 385 fprintf(out_file, "\n%*s]", indent, ""); 386 } 387 if (vmsd->subsections != NULL) { 388 const VMStateDescription **subsection = vmsd->subsections; 389 bool first; 390 391 fprintf(out_file, ",\n%*s\"Subsections\": [\n", indent, ""); 392 first = true; 393 while (*subsection != NULL) { 394 if (!first) { 395 fprintf(out_file, ",\n"); 396 } 397 dump_vmstate_vmss(out_file, subsection, indent + 2); 398 subsection++; 399 first = false; 400 } 401 fprintf(out_file, "\n%*s]", indent, ""); 402 } 403 fprintf(out_file, "\n%*s}", indent - 2, ""); 404 } 405 406 static void dump_machine_type(FILE *out_file) 407 { 408 MachineClass *mc; 409 410 mc = MACHINE_GET_CLASS(current_machine); 411 412 fprintf(out_file, " \"vmschkmachine\": {\n"); 413 fprintf(out_file, " \"Name\": \"%s\"\n", mc->name); 414 fprintf(out_file, " },\n"); 415 } 416 417 void dump_vmstate_json_to_file(FILE *out_file) 418 { 419 GSList *list, *elt; 420 bool first; 421 422 fprintf(out_file, "{\n"); 423 dump_machine_type(out_file); 424 425 first = true; 426 list = object_class_get_list(TYPE_DEVICE, true); 427 for (elt = list; elt; elt = elt->next) { 428 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data, 429 TYPE_DEVICE); 430 const char *name; 431 int indent = 2; 432 433 if (!dc->vmsd) { 434 continue; 435 } 436 437 if (!first) { 438 fprintf(out_file, ",\n"); 439 } 440 name = object_class_get_name(OBJECT_CLASS(dc)); 441 fprintf(out_file, "%*s\"%s\": {\n", indent, "", name); 442 indent += 2; 443 fprintf(out_file, "%*s\"Name\": \"%s\",\n", indent, "", name); 444 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", 445 dc->vmsd->version_id); 446 fprintf(out_file, "%*s\"minimum_version_id\": %d,\n", indent, "", 447 dc->vmsd->minimum_version_id); 448 449 dump_vmstate_vmsd(out_file, dc->vmsd, indent, false); 450 451 fprintf(out_file, "\n%*s}", indent - 2, ""); 452 first = false; 453 } 454 fprintf(out_file, "\n}\n"); 455 fclose(out_file); 456 } 457 458 static int calculate_new_instance_id(const char *idstr) 459 { 460 SaveStateEntry *se; 461 int instance_id = 0; 462 463 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 464 if (strcmp(idstr, se->idstr) == 0 465 && instance_id <= se->instance_id) { 466 instance_id = se->instance_id + 1; 467 } 468 } 469 return instance_id; 470 } 471 472 static int calculate_compat_instance_id(const char *idstr) 473 { 474 SaveStateEntry *se; 475 int instance_id = 0; 476 477 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 478 if (!se->compat) { 479 continue; 480 } 481 482 if (strcmp(idstr, se->compat->idstr) == 0 483 && instance_id <= se->compat->instance_id) { 484 instance_id = se->compat->instance_id + 1; 485 } 486 } 487 return instance_id; 488 } 489 490 /* TODO: Individual devices generally have very little idea about the rest 491 of the system, so instance_id should be removed/replaced. 492 Meanwhile pass -1 as instance_id if you do not already have a clearly 493 distinguishing id for all instances of your device class. */ 494 int register_savevm_live(DeviceState *dev, 495 const char *idstr, 496 int instance_id, 497 int version_id, 498 SaveVMHandlers *ops, 499 void *opaque) 500 { 501 SaveStateEntry *se; 502 503 se = g_new0(SaveStateEntry, 1); 504 se->version_id = version_id; 505 se->section_id = savevm_state.global_section_id++; 506 se->ops = ops; 507 se->opaque = opaque; 508 se->vmsd = NULL; 509 /* if this is a live_savem then set is_ram */ 510 if (ops->save_live_setup != NULL) { 511 se->is_ram = 1; 512 } 513 514 if (dev) { 515 char *id = qdev_get_dev_path(dev); 516 if (id) { 517 pstrcpy(se->idstr, sizeof(se->idstr), id); 518 pstrcat(se->idstr, sizeof(se->idstr), "/"); 519 g_free(id); 520 521 se->compat = g_new0(CompatEntry, 1); 522 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr); 523 se->compat->instance_id = instance_id == -1 ? 524 calculate_compat_instance_id(idstr) : instance_id; 525 instance_id = -1; 526 } 527 } 528 pstrcat(se->idstr, sizeof(se->idstr), idstr); 529 530 if (instance_id == -1) { 531 se->instance_id = calculate_new_instance_id(se->idstr); 532 } else { 533 se->instance_id = instance_id; 534 } 535 assert(!se->compat || se->instance_id == 0); 536 /* add at the end of list */ 537 QTAILQ_INSERT_TAIL(&savevm_state.handlers, se, entry); 538 return 0; 539 } 540 541 int register_savevm(DeviceState *dev, 542 const char *idstr, 543 int instance_id, 544 int version_id, 545 SaveStateHandler *save_state, 546 LoadStateHandler *load_state, 547 void *opaque) 548 { 549 SaveVMHandlers *ops = g_new0(SaveVMHandlers, 1); 550 ops->save_state = save_state; 551 ops->load_state = load_state; 552 return register_savevm_live(dev, idstr, instance_id, version_id, 553 ops, opaque); 554 } 555 556 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque) 557 { 558 SaveStateEntry *se, *new_se; 559 char id[256] = ""; 560 561 if (dev) { 562 char *path = qdev_get_dev_path(dev); 563 if (path) { 564 pstrcpy(id, sizeof(id), path); 565 pstrcat(id, sizeof(id), "/"); 566 g_free(path); 567 } 568 } 569 pstrcat(id, sizeof(id), idstr); 570 571 QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { 572 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) { 573 QTAILQ_REMOVE(&savevm_state.handlers, se, entry); 574 g_free(se->compat); 575 g_free(se->ops); 576 g_free(se); 577 } 578 } 579 } 580 581 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id, 582 const VMStateDescription *vmsd, 583 void *opaque, int alias_id, 584 int required_for_version) 585 { 586 SaveStateEntry *se; 587 588 /* If this triggers, alias support can be dropped for the vmsd. */ 589 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id); 590 591 se = g_new0(SaveStateEntry, 1); 592 se->version_id = vmsd->version_id; 593 se->section_id = savevm_state.global_section_id++; 594 se->opaque = opaque; 595 se->vmsd = vmsd; 596 se->alias_id = alias_id; 597 598 if (dev) { 599 char *id = qdev_get_dev_path(dev); 600 if (id) { 601 pstrcpy(se->idstr, sizeof(se->idstr), id); 602 pstrcat(se->idstr, sizeof(se->idstr), "/"); 603 g_free(id); 604 605 se->compat = g_new0(CompatEntry, 1); 606 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name); 607 se->compat->instance_id = instance_id == -1 ? 608 calculate_compat_instance_id(vmsd->name) : instance_id; 609 instance_id = -1; 610 } 611 } 612 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name); 613 614 if (instance_id == -1) { 615 se->instance_id = calculate_new_instance_id(se->idstr); 616 } else { 617 se->instance_id = instance_id; 618 } 619 assert(!se->compat || se->instance_id == 0); 620 /* add at the end of list */ 621 QTAILQ_INSERT_TAIL(&savevm_state.handlers, se, entry); 622 return 0; 623 } 624 625 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd, 626 void *opaque) 627 { 628 SaveStateEntry *se, *new_se; 629 630 QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { 631 if (se->vmsd == vmsd && se->opaque == opaque) { 632 QTAILQ_REMOVE(&savevm_state.handlers, se, entry); 633 g_free(se->compat); 634 g_free(se); 635 } 636 } 637 } 638 639 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id) 640 { 641 trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); 642 if (!se->vmsd) { /* Old style */ 643 return se->ops->load_state(f, se->opaque, version_id); 644 } 645 return vmstate_load_state(f, se->vmsd, se->opaque, version_id); 646 } 647 648 static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se, QJSON *vmdesc) 649 { 650 int64_t old_offset, size; 651 652 old_offset = qemu_ftell_fast(f); 653 se->ops->save_state(f, se->opaque); 654 size = qemu_ftell_fast(f) - old_offset; 655 656 if (vmdesc) { 657 json_prop_int(vmdesc, "size", size); 658 json_start_array(vmdesc, "fields"); 659 json_start_object(vmdesc, NULL); 660 json_prop_str(vmdesc, "name", "data"); 661 json_prop_int(vmdesc, "size", size); 662 json_prop_str(vmdesc, "type", "buffer"); 663 json_end_object(vmdesc); 664 json_end_array(vmdesc); 665 } 666 } 667 668 static void vmstate_save(QEMUFile *f, SaveStateEntry *se, QJSON *vmdesc) 669 { 670 trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); 671 if (!se->vmsd) { 672 vmstate_save_old_style(f, se, vmdesc); 673 return; 674 } 675 vmstate_save_state(f, se->vmsd, se->opaque, vmdesc); 676 } 677 678 void savevm_skip_section_footers(void) 679 { 680 skip_section_footers = true; 681 } 682 683 /* 684 * Write the header for device section (QEMU_VM_SECTION START/END/PART/FULL) 685 */ 686 static void save_section_header(QEMUFile *f, SaveStateEntry *se, 687 uint8_t section_type) 688 { 689 qemu_put_byte(f, section_type); 690 qemu_put_be32(f, se->section_id); 691 692 if (section_type == QEMU_VM_SECTION_FULL || 693 section_type == QEMU_VM_SECTION_START) { 694 /* ID string */ 695 size_t len = strlen(se->idstr); 696 qemu_put_byte(f, len); 697 qemu_put_buffer(f, (uint8_t *)se->idstr, len); 698 699 qemu_put_be32(f, se->instance_id); 700 qemu_put_be32(f, se->version_id); 701 } 702 } 703 704 /* 705 * Write a footer onto device sections that catches cases misformatted device 706 * sections. 707 */ 708 static void save_section_footer(QEMUFile *f, SaveStateEntry *se) 709 { 710 if (!skip_section_footers) { 711 qemu_put_byte(f, QEMU_VM_SECTION_FOOTER); 712 qemu_put_be32(f, se->section_id); 713 } 714 } 715 716 /** 717 * qemu_savevm_command_send: Send a 'QEMU_VM_COMMAND' type element with the 718 * command and associated data. 719 * 720 * @f: File to send command on 721 * @command: Command type to send 722 * @len: Length of associated data 723 * @data: Data associated with command. 724 */ 725 void qemu_savevm_command_send(QEMUFile *f, 726 enum qemu_vm_cmd command, 727 uint16_t len, 728 uint8_t *data) 729 { 730 trace_savevm_command_send(command, len); 731 qemu_put_byte(f, QEMU_VM_COMMAND); 732 qemu_put_be16(f, (uint16_t)command); 733 qemu_put_be16(f, len); 734 qemu_put_buffer(f, data, len); 735 qemu_fflush(f); 736 } 737 738 void qemu_savevm_send_ping(QEMUFile *f, uint32_t value) 739 { 740 uint32_t buf; 741 742 trace_savevm_send_ping(value); 743 buf = cpu_to_be32(value); 744 qemu_savevm_command_send(f, MIG_CMD_PING, sizeof(value), (uint8_t *)&buf); 745 } 746 747 void qemu_savevm_send_open_return_path(QEMUFile *f) 748 { 749 trace_savevm_send_open_return_path(); 750 qemu_savevm_command_send(f, MIG_CMD_OPEN_RETURN_PATH, 0, NULL); 751 } 752 753 /* We have a buffer of data to send; we don't want that all to be loaded 754 * by the command itself, so the command contains just the length of the 755 * extra buffer that we then send straight after it. 756 * TODO: Must be a better way to organise that 757 * 758 * Returns: 759 * 0 on success 760 * -ve on error 761 */ 762 int qemu_savevm_send_packaged(QEMUFile *f, const QEMUSizedBuffer *qsb) 763 { 764 size_t cur_iov; 765 size_t len = qsb_get_length(qsb); 766 uint32_t tmp; 767 768 if (len > MAX_VM_CMD_PACKAGED_SIZE) { 769 error_report("%s: Unreasonably large packaged state: %zu", 770 __func__, len); 771 return -1; 772 } 773 774 tmp = cpu_to_be32(len); 775 776 trace_qemu_savevm_send_packaged(); 777 qemu_savevm_command_send(f, MIG_CMD_PACKAGED, 4, (uint8_t *)&tmp); 778 779 /* all the data follows (concatinating the iov's) */ 780 for (cur_iov = 0; cur_iov < qsb->n_iov; cur_iov++) { 781 /* The iov entries are partially filled */ 782 size_t towrite = MIN(qsb->iov[cur_iov].iov_len, len); 783 len -= towrite; 784 785 if (!towrite) { 786 break; 787 } 788 789 qemu_put_buffer(f, qsb->iov[cur_iov].iov_base, towrite); 790 } 791 792 return 0; 793 } 794 795 /* Send prior to any postcopy transfer */ 796 void qemu_savevm_send_postcopy_advise(QEMUFile *f) 797 { 798 uint64_t tmp[2]; 799 tmp[0] = cpu_to_be64(getpagesize()); 800 tmp[1] = cpu_to_be64(1ul << qemu_target_page_bits()); 801 802 trace_qemu_savevm_send_postcopy_advise(); 803 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_ADVISE, 16, (uint8_t *)tmp); 804 } 805 806 /* Sent prior to starting the destination running in postcopy, discard pages 807 * that have already been sent but redirtied on the source. 808 * CMD_POSTCOPY_RAM_DISCARD consist of: 809 * byte version (0) 810 * byte Length of name field (not including 0) 811 * n x byte RAM block name 812 * byte 0 terminator (just for safety) 813 * n x Byte ranges within the named RAMBlock 814 * be64 Start of the range 815 * be64 Length 816 * 817 * name: RAMBlock name that these entries are part of 818 * len: Number of page entries 819 * start_list: 'len' addresses 820 * length_list: 'len' addresses 821 * 822 */ 823 void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name, 824 uint16_t len, 825 uint64_t *start_list, 826 uint64_t *length_list) 827 { 828 uint8_t *buf; 829 uint16_t tmplen; 830 uint16_t t; 831 size_t name_len = strlen(name); 832 833 trace_qemu_savevm_send_postcopy_ram_discard(name, len); 834 assert(name_len < 256); 835 buf = g_malloc0(1 + 1 + name_len + 1 + (8 + 8) * len); 836 buf[0] = postcopy_ram_discard_version; 837 buf[1] = name_len; 838 memcpy(buf + 2, name, name_len); 839 tmplen = 2 + name_len; 840 buf[tmplen++] = '\0'; 841 842 for (t = 0; t < len; t++) { 843 cpu_to_be64w((uint64_t *)(buf + tmplen), start_list[t]); 844 tmplen += 8; 845 cpu_to_be64w((uint64_t *)(buf + tmplen), length_list[t]); 846 tmplen += 8; 847 } 848 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RAM_DISCARD, tmplen, buf); 849 g_free(buf); 850 } 851 852 /* Get the destination into a state where it can receive postcopy data. */ 853 void qemu_savevm_send_postcopy_listen(QEMUFile *f) 854 { 855 trace_savevm_send_postcopy_listen(); 856 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_LISTEN, 0, NULL); 857 } 858 859 /* Kick the destination into running */ 860 void qemu_savevm_send_postcopy_run(QEMUFile *f) 861 { 862 trace_savevm_send_postcopy_run(); 863 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RUN, 0, NULL); 864 } 865 866 bool qemu_savevm_state_blocked(Error **errp) 867 { 868 SaveStateEntry *se; 869 870 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 871 if (se->vmsd && se->vmsd->unmigratable) { 872 error_setg(errp, "State blocked by non-migratable device '%s'", 873 se->idstr); 874 return true; 875 } 876 } 877 return false; 878 } 879 880 static bool enforce_config_section(void) 881 { 882 MachineState *machine = MACHINE(qdev_get_machine()); 883 return machine->enforce_config_section; 884 } 885 886 void qemu_savevm_state_header(QEMUFile *f) 887 { 888 trace_savevm_state_header(); 889 qemu_put_be32(f, QEMU_VM_FILE_MAGIC); 890 qemu_put_be32(f, QEMU_VM_FILE_VERSION); 891 892 if (!savevm_state.skip_configuration || enforce_config_section()) { 893 qemu_put_byte(f, QEMU_VM_CONFIGURATION); 894 vmstate_save_state(f, &vmstate_configuration, &savevm_state, 0); 895 } 896 897 } 898 899 void qemu_savevm_state_begin(QEMUFile *f, 900 const MigrationParams *params) 901 { 902 SaveStateEntry *se; 903 int ret; 904 905 trace_savevm_state_begin(); 906 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 907 if (!se->ops || !se->ops->set_params) { 908 continue; 909 } 910 se->ops->set_params(params, se->opaque); 911 } 912 913 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 914 if (!se->ops || !se->ops->save_live_setup) { 915 continue; 916 } 917 if (se->ops && se->ops->is_active) { 918 if (!se->ops->is_active(se->opaque)) { 919 continue; 920 } 921 } 922 save_section_header(f, se, QEMU_VM_SECTION_START); 923 924 ret = se->ops->save_live_setup(f, se->opaque); 925 save_section_footer(f, se); 926 if (ret < 0) { 927 qemu_file_set_error(f, ret); 928 break; 929 } 930 } 931 } 932 933 /* 934 * this function has three return values: 935 * negative: there was one error, and we have -errno. 936 * 0 : We haven't finished, caller have to go again 937 * 1 : We have finished, we can go to complete phase 938 */ 939 int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy) 940 { 941 SaveStateEntry *se; 942 int ret = 1; 943 944 trace_savevm_state_iterate(); 945 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 946 if (!se->ops || !se->ops->save_live_iterate) { 947 continue; 948 } 949 if (se->ops && se->ops->is_active) { 950 if (!se->ops->is_active(se->opaque)) { 951 continue; 952 } 953 } 954 /* 955 * In the postcopy phase, any device that doesn't know how to 956 * do postcopy should have saved it's state in the _complete 957 * call that's already run, it might get confused if we call 958 * iterate afterwards. 959 */ 960 if (postcopy && !se->ops->save_live_complete_postcopy) { 961 continue; 962 } 963 if (qemu_file_rate_limit(f)) { 964 return 0; 965 } 966 trace_savevm_section_start(se->idstr, se->section_id); 967 968 save_section_header(f, se, QEMU_VM_SECTION_PART); 969 970 ret = se->ops->save_live_iterate(f, se->opaque); 971 trace_savevm_section_end(se->idstr, se->section_id, ret); 972 save_section_footer(f, se); 973 974 if (ret < 0) { 975 qemu_file_set_error(f, ret); 976 } 977 if (ret <= 0) { 978 /* Do not proceed to the next vmstate before this one reported 979 completion of the current stage. This serializes the migration 980 and reduces the probability that a faster changing state is 981 synchronized over and over again. */ 982 break; 983 } 984 } 985 return ret; 986 } 987 988 static bool should_send_vmdesc(void) 989 { 990 MachineState *machine = MACHINE(qdev_get_machine()); 991 bool in_postcopy = migration_in_postcopy(migrate_get_current()); 992 return !machine->suppress_vmdesc && !in_postcopy; 993 } 994 995 /* 996 * Calls the save_live_complete_postcopy methods 997 * causing the last few pages to be sent immediately and doing any associated 998 * cleanup. 999 * Note postcopy also calls qemu_savevm_state_complete_precopy to complete 1000 * all the other devices, but that happens at the point we switch to postcopy. 1001 */ 1002 void qemu_savevm_state_complete_postcopy(QEMUFile *f) 1003 { 1004 SaveStateEntry *se; 1005 int ret; 1006 1007 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1008 if (!se->ops || !se->ops->save_live_complete_postcopy) { 1009 continue; 1010 } 1011 if (se->ops && se->ops->is_active) { 1012 if (!se->ops->is_active(se->opaque)) { 1013 continue; 1014 } 1015 } 1016 trace_savevm_section_start(se->idstr, se->section_id); 1017 /* Section type */ 1018 qemu_put_byte(f, QEMU_VM_SECTION_END); 1019 qemu_put_be32(f, se->section_id); 1020 1021 ret = se->ops->save_live_complete_postcopy(f, se->opaque); 1022 trace_savevm_section_end(se->idstr, se->section_id, ret); 1023 save_section_footer(f, se); 1024 if (ret < 0) { 1025 qemu_file_set_error(f, ret); 1026 return; 1027 } 1028 } 1029 1030 qemu_put_byte(f, QEMU_VM_EOF); 1031 qemu_fflush(f); 1032 } 1033 1034 void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only) 1035 { 1036 QJSON *vmdesc; 1037 int vmdesc_len; 1038 SaveStateEntry *se; 1039 int ret; 1040 bool in_postcopy = migration_in_postcopy(migrate_get_current()); 1041 1042 trace_savevm_state_complete_precopy(); 1043 1044 cpu_synchronize_all_states(); 1045 1046 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1047 if (!se->ops || 1048 (in_postcopy && se->ops->save_live_complete_postcopy) || 1049 (in_postcopy && !iterable_only) || 1050 !se->ops->save_live_complete_precopy) { 1051 continue; 1052 } 1053 1054 if (se->ops && se->ops->is_active) { 1055 if (!se->ops->is_active(se->opaque)) { 1056 continue; 1057 } 1058 } 1059 trace_savevm_section_start(se->idstr, se->section_id); 1060 1061 save_section_header(f, se, QEMU_VM_SECTION_END); 1062 1063 ret = se->ops->save_live_complete_precopy(f, se->opaque); 1064 trace_savevm_section_end(se->idstr, se->section_id, ret); 1065 save_section_footer(f, se); 1066 if (ret < 0) { 1067 qemu_file_set_error(f, ret); 1068 return; 1069 } 1070 } 1071 1072 if (iterable_only) { 1073 return; 1074 } 1075 1076 vmdesc = qjson_new(); 1077 json_prop_int(vmdesc, "page_size", TARGET_PAGE_SIZE); 1078 json_start_array(vmdesc, "devices"); 1079 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1080 1081 if ((!se->ops || !se->ops->save_state) && !se->vmsd) { 1082 continue; 1083 } 1084 if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { 1085 trace_savevm_section_skip(se->idstr, se->section_id); 1086 continue; 1087 } 1088 1089 trace_savevm_section_start(se->idstr, se->section_id); 1090 1091 json_start_object(vmdesc, NULL); 1092 json_prop_str(vmdesc, "name", se->idstr); 1093 json_prop_int(vmdesc, "instance_id", se->instance_id); 1094 1095 save_section_header(f, se, QEMU_VM_SECTION_FULL); 1096 vmstate_save(f, se, vmdesc); 1097 trace_savevm_section_end(se->idstr, se->section_id, 0); 1098 save_section_footer(f, se); 1099 1100 json_end_object(vmdesc); 1101 } 1102 1103 if (!in_postcopy) { 1104 /* Postcopy stream will still be going */ 1105 qemu_put_byte(f, QEMU_VM_EOF); 1106 } 1107 1108 json_end_array(vmdesc); 1109 qjson_finish(vmdesc); 1110 vmdesc_len = strlen(qjson_get_str(vmdesc)); 1111 1112 if (should_send_vmdesc()) { 1113 qemu_put_byte(f, QEMU_VM_VMDESCRIPTION); 1114 qemu_put_be32(f, vmdesc_len); 1115 qemu_put_buffer(f, (uint8_t *)qjson_get_str(vmdesc), vmdesc_len); 1116 } 1117 object_unref(OBJECT(vmdesc)); 1118 1119 qemu_fflush(f); 1120 } 1121 1122 /* Give an estimate of the amount left to be transferred, 1123 * the result is split into the amount for units that can and 1124 * for units that can't do postcopy. 1125 */ 1126 void qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size, 1127 uint64_t *res_non_postcopiable, 1128 uint64_t *res_postcopiable) 1129 { 1130 SaveStateEntry *se; 1131 1132 *res_non_postcopiable = 0; 1133 *res_postcopiable = 0; 1134 1135 1136 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1137 if (!se->ops || !se->ops->save_live_pending) { 1138 continue; 1139 } 1140 if (se->ops && se->ops->is_active) { 1141 if (!se->ops->is_active(se->opaque)) { 1142 continue; 1143 } 1144 } 1145 se->ops->save_live_pending(f, se->opaque, max_size, 1146 res_non_postcopiable, res_postcopiable); 1147 } 1148 } 1149 1150 void qemu_savevm_state_cleanup(void) 1151 { 1152 SaveStateEntry *se; 1153 1154 trace_savevm_state_cleanup(); 1155 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1156 if (se->ops && se->ops->cleanup) { 1157 se->ops->cleanup(se->opaque); 1158 } 1159 } 1160 } 1161 1162 static int qemu_savevm_state(QEMUFile *f, Error **errp) 1163 { 1164 int ret; 1165 MigrationParams params = { 1166 .blk = 0, 1167 .shared = 0 1168 }; 1169 MigrationState *ms = migrate_init(¶ms); 1170 ms->to_dst_file = f; 1171 1172 if (qemu_savevm_state_blocked(errp)) { 1173 return -EINVAL; 1174 } 1175 1176 qemu_mutex_unlock_iothread(); 1177 qemu_savevm_state_header(f); 1178 qemu_savevm_state_begin(f, ¶ms); 1179 qemu_mutex_lock_iothread(); 1180 1181 while (qemu_file_get_error(f) == 0) { 1182 if (qemu_savevm_state_iterate(f, false) > 0) { 1183 break; 1184 } 1185 } 1186 1187 ret = qemu_file_get_error(f); 1188 if (ret == 0) { 1189 qemu_savevm_state_complete_precopy(f, false); 1190 ret = qemu_file_get_error(f); 1191 } 1192 qemu_savevm_state_cleanup(); 1193 if (ret != 0) { 1194 error_setg_errno(errp, -ret, "Error while writing VM state"); 1195 } 1196 return ret; 1197 } 1198 1199 static int qemu_save_device_state(QEMUFile *f) 1200 { 1201 SaveStateEntry *se; 1202 1203 qemu_put_be32(f, QEMU_VM_FILE_MAGIC); 1204 qemu_put_be32(f, QEMU_VM_FILE_VERSION); 1205 1206 cpu_synchronize_all_states(); 1207 1208 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1209 if (se->is_ram) { 1210 continue; 1211 } 1212 if ((!se->ops || !se->ops->save_state) && !se->vmsd) { 1213 continue; 1214 } 1215 if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { 1216 continue; 1217 } 1218 1219 save_section_header(f, se, QEMU_VM_SECTION_FULL); 1220 1221 vmstate_save(f, se, NULL); 1222 1223 save_section_footer(f, se); 1224 } 1225 1226 qemu_put_byte(f, QEMU_VM_EOF); 1227 1228 return qemu_file_get_error(f); 1229 } 1230 1231 static SaveStateEntry *find_se(const char *idstr, int instance_id) 1232 { 1233 SaveStateEntry *se; 1234 1235 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { 1236 if (!strcmp(se->idstr, idstr) && 1237 (instance_id == se->instance_id || 1238 instance_id == se->alias_id)) 1239 return se; 1240 /* Migrating from an older version? */ 1241 if (strstr(se->idstr, idstr) && se->compat) { 1242 if (!strcmp(se->compat->idstr, idstr) && 1243 (instance_id == se->compat->instance_id || 1244 instance_id == se->alias_id)) 1245 return se; 1246 } 1247 } 1248 return NULL; 1249 } 1250 1251 enum LoadVMExitCodes { 1252 /* Allow a command to quit all layers of nested loadvm loops */ 1253 LOADVM_QUIT = 1, 1254 }; 1255 1256 static int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis); 1257 1258 /* ------ incoming postcopy messages ------ */ 1259 /* 'advise' arrives before any transfers just to tell us that a postcopy 1260 * *might* happen - it might be skipped if precopy transferred everything 1261 * quickly. 1262 */ 1263 static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis) 1264 { 1265 PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_ADVISE); 1266 uint64_t remote_hps, remote_tps; 1267 1268 trace_loadvm_postcopy_handle_advise(); 1269 if (ps != POSTCOPY_INCOMING_NONE) { 1270 error_report("CMD_POSTCOPY_ADVISE in wrong postcopy state (%d)", ps); 1271 return -1; 1272 } 1273 1274 if (!postcopy_ram_supported_by_host()) { 1275 return -1; 1276 } 1277 1278 remote_hps = qemu_get_be64(mis->from_src_file); 1279 if (remote_hps != getpagesize()) { 1280 /* 1281 * Some combinations of mismatch are probably possible but it gets 1282 * a bit more complicated. In particular we need to place whole 1283 * host pages on the dest at once, and we need to ensure that we 1284 * handle dirtying to make sure we never end up sending part of 1285 * a hostpage on it's own. 1286 */ 1287 error_report("Postcopy needs matching host page sizes (s=%d d=%d)", 1288 (int)remote_hps, getpagesize()); 1289 return -1; 1290 } 1291 1292 remote_tps = qemu_get_be64(mis->from_src_file); 1293 if (remote_tps != (1ul << qemu_target_page_bits())) { 1294 /* 1295 * Again, some differences could be dealt with, but for now keep it 1296 * simple. 1297 */ 1298 error_report("Postcopy needs matching target page sizes (s=%d d=%d)", 1299 (int)remote_tps, 1 << qemu_target_page_bits()); 1300 return -1; 1301 } 1302 1303 if (ram_postcopy_incoming_init(mis)) { 1304 return -1; 1305 } 1306 1307 postcopy_state_set(POSTCOPY_INCOMING_ADVISE); 1308 1309 return 0; 1310 } 1311 1312 /* After postcopy we will be told to throw some pages away since they're 1313 * dirty and will have to be demand fetched. Must happen before CPU is 1314 * started. 1315 * There can be 0..many of these messages, each encoding multiple pages. 1316 */ 1317 static int loadvm_postcopy_ram_handle_discard(MigrationIncomingState *mis, 1318 uint16_t len) 1319 { 1320 int tmp; 1321 char ramid[256]; 1322 PostcopyState ps = postcopy_state_get(); 1323 1324 trace_loadvm_postcopy_ram_handle_discard(); 1325 1326 switch (ps) { 1327 case POSTCOPY_INCOMING_ADVISE: 1328 /* 1st discard */ 1329 tmp = postcopy_ram_prepare_discard(mis); 1330 if (tmp) { 1331 return tmp; 1332 } 1333 break; 1334 1335 case POSTCOPY_INCOMING_DISCARD: 1336 /* Expected state */ 1337 break; 1338 1339 default: 1340 error_report("CMD_POSTCOPY_RAM_DISCARD in wrong postcopy state (%d)", 1341 ps); 1342 return -1; 1343 } 1344 /* We're expecting a 1345 * Version (0) 1346 * a RAM ID string (length byte, name, 0 term) 1347 * then at least 1 16 byte chunk 1348 */ 1349 if (len < (1 + 1 + 1 + 1 + 2 * 8)) { 1350 error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); 1351 return -1; 1352 } 1353 1354 tmp = qemu_get_byte(mis->from_src_file); 1355 if (tmp != postcopy_ram_discard_version) { 1356 error_report("CMD_POSTCOPY_RAM_DISCARD invalid version (%d)", tmp); 1357 return -1; 1358 } 1359 1360 if (!qemu_get_counted_string(mis->from_src_file, ramid)) { 1361 error_report("CMD_POSTCOPY_RAM_DISCARD Failed to read RAMBlock ID"); 1362 return -1; 1363 } 1364 tmp = qemu_get_byte(mis->from_src_file); 1365 if (tmp != 0) { 1366 error_report("CMD_POSTCOPY_RAM_DISCARD missing nil (%d)", tmp); 1367 return -1; 1368 } 1369 1370 len -= 3 + strlen(ramid); 1371 if (len % 16) { 1372 error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); 1373 return -1; 1374 } 1375 trace_loadvm_postcopy_ram_handle_discard_header(ramid, len); 1376 while (len) { 1377 uint64_t start_addr, block_length; 1378 start_addr = qemu_get_be64(mis->from_src_file); 1379 block_length = qemu_get_be64(mis->from_src_file); 1380 1381 len -= 16; 1382 int ret = ram_discard_range(mis, ramid, start_addr, 1383 block_length); 1384 if (ret) { 1385 return ret; 1386 } 1387 } 1388 trace_loadvm_postcopy_ram_handle_discard_end(); 1389 1390 return 0; 1391 } 1392 1393 /* 1394 * Triggered by a postcopy_listen command; this thread takes over reading 1395 * the input stream, leaving the main thread free to carry on loading the rest 1396 * of the device state (from RAM). 1397 * (TODO:This could do with being in a postcopy file - but there again it's 1398 * just another input loop, not that postcopy specific) 1399 */ 1400 static void *postcopy_ram_listen_thread(void *opaque) 1401 { 1402 QEMUFile *f = opaque; 1403 MigrationIncomingState *mis = migration_incoming_get_current(); 1404 int load_res; 1405 1406 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, 1407 MIGRATION_STATUS_POSTCOPY_ACTIVE); 1408 qemu_sem_post(&mis->listen_thread_sem); 1409 trace_postcopy_ram_listen_thread_start(); 1410 1411 /* 1412 * Because we're a thread and not a coroutine we can't yield 1413 * in qemu_file, and thus we must be blocking now. 1414 */ 1415 qemu_file_set_blocking(f, true); 1416 load_res = qemu_loadvm_state_main(f, mis); 1417 /* And non-blocking again so we don't block in any cleanup */ 1418 qemu_file_set_blocking(f, false); 1419 1420 trace_postcopy_ram_listen_thread_exit(); 1421 if (load_res < 0) { 1422 error_report("%s: loadvm failed: %d", __func__, load_res); 1423 qemu_file_set_error(f, load_res); 1424 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 1425 MIGRATION_STATUS_FAILED); 1426 } else { 1427 /* 1428 * This looks good, but it's possible that the device loading in the 1429 * main thread hasn't finished yet, and so we might not be in 'RUN' 1430 * state yet; wait for the end of the main thread. 1431 */ 1432 qemu_event_wait(&mis->main_thread_load_event); 1433 } 1434 postcopy_ram_incoming_cleanup(mis); 1435 1436 if (load_res < 0) { 1437 /* 1438 * If something went wrong then we have a bad state so exit; 1439 * depending how far we got it might be possible at this point 1440 * to leave the guest running and fire MCEs for pages that never 1441 * arrived as a desperate recovery step. 1442 */ 1443 exit(EXIT_FAILURE); 1444 } 1445 1446 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, 1447 MIGRATION_STATUS_COMPLETED); 1448 /* 1449 * If everything has worked fine, then the main thread has waited 1450 * for us to start, and we're the last use of the mis. 1451 * (If something broke then qemu will have to exit anyway since it's 1452 * got a bad migration state). 1453 */ 1454 migration_incoming_state_destroy(); 1455 1456 1457 return NULL; 1458 } 1459 1460 /* After this message we must be able to immediately receive postcopy data */ 1461 static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis) 1462 { 1463 PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_LISTENING); 1464 trace_loadvm_postcopy_handle_listen(); 1465 if (ps != POSTCOPY_INCOMING_ADVISE && ps != POSTCOPY_INCOMING_DISCARD) { 1466 error_report("CMD_POSTCOPY_LISTEN in wrong postcopy state (%d)", ps); 1467 return -1; 1468 } 1469 if (ps == POSTCOPY_INCOMING_ADVISE) { 1470 /* 1471 * A rare case, we entered listen without having to do any discards, 1472 * so do the setup that's normally done at the time of the 1st discard. 1473 */ 1474 postcopy_ram_prepare_discard(mis); 1475 } 1476 1477 /* 1478 * Sensitise RAM - can now generate requests for blocks that don't exist 1479 * However, at this point the CPU shouldn't be running, and the IO 1480 * shouldn't be doing anything yet so don't actually expect requests 1481 */ 1482 if (postcopy_ram_enable_notify(mis)) { 1483 return -1; 1484 } 1485 1486 if (mis->have_listen_thread) { 1487 error_report("CMD_POSTCOPY_RAM_LISTEN already has a listen thread"); 1488 return -1; 1489 } 1490 1491 mis->have_listen_thread = true; 1492 /* Start up the listening thread and wait for it to signal ready */ 1493 qemu_sem_init(&mis->listen_thread_sem, 0); 1494 qemu_thread_create(&mis->listen_thread, "postcopy/listen", 1495 postcopy_ram_listen_thread, mis->from_src_file, 1496 QEMU_THREAD_DETACHED); 1497 qemu_sem_wait(&mis->listen_thread_sem); 1498 qemu_sem_destroy(&mis->listen_thread_sem); 1499 1500 return 0; 1501 } 1502 1503 1504 typedef struct { 1505 QEMUBH *bh; 1506 } HandleRunBhData; 1507 1508 static void loadvm_postcopy_handle_run_bh(void *opaque) 1509 { 1510 Error *local_err = NULL; 1511 HandleRunBhData *data = opaque; 1512 1513 /* TODO we should move all of this lot into postcopy_ram.c or a shared code 1514 * in migration.c 1515 */ 1516 cpu_synchronize_all_post_init(); 1517 1518 qemu_announce_self(); 1519 1520 /* Make sure all file formats flush their mutable metadata */ 1521 bdrv_invalidate_cache_all(&local_err); 1522 if (local_err) { 1523 error_report_err(local_err); 1524 } 1525 1526 trace_loadvm_postcopy_handle_run_cpu_sync(); 1527 cpu_synchronize_all_post_init(); 1528 1529 trace_loadvm_postcopy_handle_run_vmstart(); 1530 1531 if (autostart) { 1532 /* Hold onto your hats, starting the CPU */ 1533 vm_start(); 1534 } else { 1535 /* leave it paused and let management decide when to start the CPU */ 1536 runstate_set(RUN_STATE_PAUSED); 1537 } 1538 1539 qemu_bh_delete(data->bh); 1540 g_free(data); 1541 } 1542 1543 /* After all discards we can start running and asking for pages */ 1544 static int loadvm_postcopy_handle_run(MigrationIncomingState *mis) 1545 { 1546 PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_RUNNING); 1547 HandleRunBhData *data; 1548 1549 trace_loadvm_postcopy_handle_run(); 1550 if (ps != POSTCOPY_INCOMING_LISTENING) { 1551 error_report("CMD_POSTCOPY_RUN in wrong postcopy state (%d)", ps); 1552 return -1; 1553 } 1554 1555 data = g_new(HandleRunBhData, 1); 1556 data->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, data); 1557 qemu_bh_schedule(data->bh); 1558 1559 /* We need to finish reading the stream from the package 1560 * and also stop reading anything more from the stream that loaded the 1561 * package (since it's now being read by the listener thread). 1562 * LOADVM_QUIT will quit all the layers of nested loadvm loops. 1563 */ 1564 return LOADVM_QUIT; 1565 } 1566 1567 /** 1568 * Immediately following this command is a blob of data containing an embedded 1569 * chunk of migration stream; read it and load it. 1570 * 1571 * @mis: Incoming state 1572 * @length: Length of packaged data to read 1573 * 1574 * Returns: Negative values on error 1575 * 1576 */ 1577 static int loadvm_handle_cmd_packaged(MigrationIncomingState *mis) 1578 { 1579 int ret; 1580 uint8_t *buffer; 1581 uint32_t length; 1582 QEMUSizedBuffer *qsb; 1583 1584 length = qemu_get_be32(mis->from_src_file); 1585 trace_loadvm_handle_cmd_packaged(length); 1586 1587 if (length > MAX_VM_CMD_PACKAGED_SIZE) { 1588 error_report("Unreasonably large packaged state: %u", length); 1589 return -1; 1590 } 1591 buffer = g_malloc0(length); 1592 ret = qemu_get_buffer(mis->from_src_file, buffer, (int)length); 1593 if (ret != length) { 1594 g_free(buffer); 1595 error_report("CMD_PACKAGED: Buffer receive fail ret=%d length=%d", 1596 ret, length); 1597 return (ret < 0) ? ret : -EAGAIN; 1598 } 1599 trace_loadvm_handle_cmd_packaged_received(ret); 1600 1601 /* Setup a dummy QEMUFile that actually reads from the buffer */ 1602 qsb = qsb_create(buffer, length); 1603 g_free(buffer); /* Because qsb_create copies */ 1604 if (!qsb) { 1605 error_report("Unable to create qsb"); 1606 } 1607 QEMUFile *packf = qemu_bufopen("r", qsb); 1608 1609 ret = qemu_loadvm_state_main(packf, mis); 1610 trace_loadvm_handle_cmd_packaged_main(ret); 1611 qemu_fclose(packf); 1612 qsb_free(qsb); 1613 1614 return ret; 1615 } 1616 1617 /* 1618 * Process an incoming 'QEMU_VM_COMMAND' 1619 * 0 just a normal return 1620 * LOADVM_QUIT All good, but exit the loop 1621 * <0 Error 1622 */ 1623 static int loadvm_process_command(QEMUFile *f) 1624 { 1625 MigrationIncomingState *mis = migration_incoming_get_current(); 1626 uint16_t cmd; 1627 uint16_t len; 1628 uint32_t tmp32; 1629 1630 cmd = qemu_get_be16(f); 1631 len = qemu_get_be16(f); 1632 1633 trace_loadvm_process_command(cmd, len); 1634 if (cmd >= MIG_CMD_MAX || cmd == MIG_CMD_INVALID) { 1635 error_report("MIG_CMD 0x%x unknown (len 0x%x)", cmd, len); 1636 return -EINVAL; 1637 } 1638 1639 if (mig_cmd_args[cmd].len != -1 && mig_cmd_args[cmd].len != len) { 1640 error_report("%s received with bad length - expecting %zu, got %d", 1641 mig_cmd_args[cmd].name, 1642 (size_t)mig_cmd_args[cmd].len, len); 1643 return -ERANGE; 1644 } 1645 1646 switch (cmd) { 1647 case MIG_CMD_OPEN_RETURN_PATH: 1648 if (mis->to_src_file) { 1649 error_report("CMD_OPEN_RETURN_PATH called when RP already open"); 1650 /* Not really a problem, so don't give up */ 1651 return 0; 1652 } 1653 mis->to_src_file = qemu_file_get_return_path(f); 1654 if (!mis->to_src_file) { 1655 error_report("CMD_OPEN_RETURN_PATH failed"); 1656 return -1; 1657 } 1658 break; 1659 1660 case MIG_CMD_PING: 1661 tmp32 = qemu_get_be32(f); 1662 trace_loadvm_process_command_ping(tmp32); 1663 if (!mis->to_src_file) { 1664 error_report("CMD_PING (0x%x) received with no return path", 1665 tmp32); 1666 return -1; 1667 } 1668 migrate_send_rp_pong(mis, tmp32); 1669 break; 1670 1671 case MIG_CMD_PACKAGED: 1672 return loadvm_handle_cmd_packaged(mis); 1673 1674 case MIG_CMD_POSTCOPY_ADVISE: 1675 return loadvm_postcopy_handle_advise(mis); 1676 1677 case MIG_CMD_POSTCOPY_LISTEN: 1678 return loadvm_postcopy_handle_listen(mis); 1679 1680 case MIG_CMD_POSTCOPY_RUN: 1681 return loadvm_postcopy_handle_run(mis); 1682 1683 case MIG_CMD_POSTCOPY_RAM_DISCARD: 1684 return loadvm_postcopy_ram_handle_discard(mis, len); 1685 } 1686 1687 return 0; 1688 } 1689 1690 struct LoadStateEntry { 1691 QLIST_ENTRY(LoadStateEntry) entry; 1692 SaveStateEntry *se; 1693 int section_id; 1694 int version_id; 1695 }; 1696 1697 /* 1698 * Read a footer off the wire and check that it matches the expected section 1699 * 1700 * Returns: true if the footer was good 1701 * false if there is a problem (and calls error_report to say why) 1702 */ 1703 static bool check_section_footer(QEMUFile *f, LoadStateEntry *le) 1704 { 1705 uint8_t read_mark; 1706 uint32_t read_section_id; 1707 1708 if (skip_section_footers) { 1709 /* No footer to check */ 1710 return true; 1711 } 1712 1713 read_mark = qemu_get_byte(f); 1714 1715 if (read_mark != QEMU_VM_SECTION_FOOTER) { 1716 error_report("Missing section footer for %s", le->se->idstr); 1717 return false; 1718 } 1719 1720 read_section_id = qemu_get_be32(f); 1721 if (read_section_id != le->section_id) { 1722 error_report("Mismatched section id in footer for %s -" 1723 " read 0x%x expected 0x%x", 1724 le->se->idstr, read_section_id, le->section_id); 1725 return false; 1726 } 1727 1728 /* All good */ 1729 return true; 1730 } 1731 1732 void loadvm_free_handlers(MigrationIncomingState *mis) 1733 { 1734 LoadStateEntry *le, *new_le; 1735 1736 QLIST_FOREACH_SAFE(le, &mis->loadvm_handlers, entry, new_le) { 1737 QLIST_REMOVE(le, entry); 1738 g_free(le); 1739 } 1740 } 1741 1742 static int 1743 qemu_loadvm_section_start_full(QEMUFile *f, MigrationIncomingState *mis) 1744 { 1745 uint32_t instance_id, version_id, section_id; 1746 SaveStateEntry *se; 1747 LoadStateEntry *le; 1748 char idstr[256]; 1749 int ret; 1750 1751 /* Read section start */ 1752 section_id = qemu_get_be32(f); 1753 if (!qemu_get_counted_string(f, idstr)) { 1754 error_report("Unable to read ID string for section %u", 1755 section_id); 1756 return -EINVAL; 1757 } 1758 instance_id = qemu_get_be32(f); 1759 version_id = qemu_get_be32(f); 1760 1761 trace_qemu_loadvm_state_section_startfull(section_id, idstr, 1762 instance_id, version_id); 1763 /* Find savevm section */ 1764 se = find_se(idstr, instance_id); 1765 if (se == NULL) { 1766 error_report("Unknown savevm section or instance '%s' %d", 1767 idstr, instance_id); 1768 return -EINVAL; 1769 } 1770 1771 /* Validate version */ 1772 if (version_id > se->version_id) { 1773 error_report("savevm: unsupported version %d for '%s' v%d", 1774 version_id, idstr, se->version_id); 1775 return -EINVAL; 1776 } 1777 1778 /* Add entry */ 1779 le = g_malloc0(sizeof(*le)); 1780 1781 le->se = se; 1782 le->section_id = section_id; 1783 le->version_id = version_id; 1784 QLIST_INSERT_HEAD(&mis->loadvm_handlers, le, entry); 1785 1786 ret = vmstate_load(f, le->se, le->version_id); 1787 if (ret < 0) { 1788 error_report("error while loading state for instance 0x%x of" 1789 " device '%s'", instance_id, idstr); 1790 return ret; 1791 } 1792 if (!check_section_footer(f, le)) { 1793 return -EINVAL; 1794 } 1795 1796 return 0; 1797 } 1798 1799 static int 1800 qemu_loadvm_section_part_end(QEMUFile *f, MigrationIncomingState *mis) 1801 { 1802 uint32_t section_id; 1803 LoadStateEntry *le; 1804 int ret; 1805 1806 section_id = qemu_get_be32(f); 1807 1808 trace_qemu_loadvm_state_section_partend(section_id); 1809 QLIST_FOREACH(le, &mis->loadvm_handlers, entry) { 1810 if (le->section_id == section_id) { 1811 break; 1812 } 1813 } 1814 if (le == NULL) { 1815 error_report("Unknown savevm section %d", section_id); 1816 return -EINVAL; 1817 } 1818 1819 ret = vmstate_load(f, le->se, le->version_id); 1820 if (ret < 0) { 1821 error_report("error while loading state section id %d(%s)", 1822 section_id, le->se->idstr); 1823 return ret; 1824 } 1825 if (!check_section_footer(f, le)) { 1826 return -EINVAL; 1827 } 1828 1829 return 0; 1830 } 1831 1832 static int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis) 1833 { 1834 uint8_t section_type; 1835 int ret; 1836 1837 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) { 1838 1839 trace_qemu_loadvm_state_section(section_type); 1840 switch (section_type) { 1841 case QEMU_VM_SECTION_START: 1842 case QEMU_VM_SECTION_FULL: 1843 ret = qemu_loadvm_section_start_full(f, mis); 1844 if (ret < 0) { 1845 return ret; 1846 } 1847 break; 1848 case QEMU_VM_SECTION_PART: 1849 case QEMU_VM_SECTION_END: 1850 ret = qemu_loadvm_section_part_end(f, mis); 1851 if (ret < 0) { 1852 return ret; 1853 } 1854 break; 1855 case QEMU_VM_COMMAND: 1856 ret = loadvm_process_command(f); 1857 trace_qemu_loadvm_state_section_command(ret); 1858 if ((ret < 0) || (ret & LOADVM_QUIT)) { 1859 return ret; 1860 } 1861 break; 1862 default: 1863 error_report("Unknown savevm section type %d", section_type); 1864 return -EINVAL; 1865 } 1866 } 1867 1868 return 0; 1869 } 1870 1871 int qemu_loadvm_state(QEMUFile *f) 1872 { 1873 MigrationIncomingState *mis = migration_incoming_get_current(); 1874 Error *local_err = NULL; 1875 unsigned int v; 1876 int ret; 1877 1878 if (qemu_savevm_state_blocked(&local_err)) { 1879 error_report_err(local_err); 1880 return -EINVAL; 1881 } 1882 1883 v = qemu_get_be32(f); 1884 if (v != QEMU_VM_FILE_MAGIC) { 1885 error_report("Not a migration stream"); 1886 return -EINVAL; 1887 } 1888 1889 v = qemu_get_be32(f); 1890 if (v == QEMU_VM_FILE_VERSION_COMPAT) { 1891 error_report("SaveVM v2 format is obsolete and don't work anymore"); 1892 return -ENOTSUP; 1893 } 1894 if (v != QEMU_VM_FILE_VERSION) { 1895 error_report("Unsupported migration stream version"); 1896 return -ENOTSUP; 1897 } 1898 1899 if (!savevm_state.skip_configuration || enforce_config_section()) { 1900 if (qemu_get_byte(f) != QEMU_VM_CONFIGURATION) { 1901 error_report("Configuration section missing"); 1902 return -EINVAL; 1903 } 1904 ret = vmstate_load_state(f, &vmstate_configuration, &savevm_state, 0); 1905 1906 if (ret) { 1907 return ret; 1908 } 1909 } 1910 1911 ret = qemu_loadvm_state_main(f, mis); 1912 qemu_event_set(&mis->main_thread_load_event); 1913 1914 trace_qemu_loadvm_state_post_main(ret); 1915 1916 if (mis->have_listen_thread) { 1917 /* Listen thread still going, can't clean up yet */ 1918 return ret; 1919 } 1920 1921 if (ret == 0) { 1922 ret = qemu_file_get_error(f); 1923 } 1924 1925 /* 1926 * Try to read in the VMDESC section as well, so that dumping tools that 1927 * intercept our migration stream have the chance to see it. 1928 */ 1929 1930 /* We've got to be careful; if we don't read the data and just shut the fd 1931 * then the sender can error if we close while it's still sending. 1932 * We also mustn't read data that isn't there; some transports (RDMA) 1933 * will stall waiting for that data when the source has already closed. 1934 */ 1935 if (ret == 0 && should_send_vmdesc()) { 1936 uint8_t *buf; 1937 uint32_t size; 1938 uint8_t section_type = qemu_get_byte(f); 1939 1940 if (section_type != QEMU_VM_VMDESCRIPTION) { 1941 error_report("Expected vmdescription section, but got %d", 1942 section_type); 1943 /* 1944 * It doesn't seem worth failing at this point since 1945 * we apparently have an otherwise valid VM state 1946 */ 1947 } else { 1948 buf = g_malloc(0x1000); 1949 size = qemu_get_be32(f); 1950 1951 while (size > 0) { 1952 uint32_t read_chunk = MIN(size, 0x1000); 1953 qemu_get_buffer(f, buf, read_chunk); 1954 size -= read_chunk; 1955 } 1956 g_free(buf); 1957 } 1958 } 1959 1960 cpu_synchronize_all_post_init(); 1961 1962 return ret; 1963 } 1964 1965 void hmp_savevm(Monitor *mon, const QDict *qdict) 1966 { 1967 BlockDriverState *bs, *bs1; 1968 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1; 1969 int ret; 1970 QEMUFile *f; 1971 int saved_vm_running; 1972 uint64_t vm_state_size; 1973 qemu_timeval tv; 1974 struct tm tm; 1975 const char *name = qdict_get_try_str(qdict, "name"); 1976 Error *local_err = NULL; 1977 AioContext *aio_context; 1978 1979 if (!bdrv_all_can_snapshot(&bs)) { 1980 monitor_printf(mon, "Device '%s' is writable but does not " 1981 "support snapshots.\n", bdrv_get_device_name(bs)); 1982 return; 1983 } 1984 1985 /* Delete old snapshots of the same name */ 1986 if (name && bdrv_all_delete_snapshot(name, &bs1, &local_err) < 0) { 1987 error_reportf_err(local_err, 1988 "Error while deleting snapshot on device '%s': ", 1989 bdrv_get_device_name(bs1)); 1990 return; 1991 } 1992 1993 bs = bdrv_all_find_vmstate_bs(); 1994 if (bs == NULL) { 1995 monitor_printf(mon, "No block device can accept snapshots\n"); 1996 return; 1997 } 1998 aio_context = bdrv_get_aio_context(bs); 1999 2000 saved_vm_running = runstate_is_running(); 2001 2002 ret = global_state_store(); 2003 if (ret) { 2004 monitor_printf(mon, "Error saving global state\n"); 2005 return; 2006 } 2007 vm_stop(RUN_STATE_SAVE_VM); 2008 2009 aio_context_acquire(aio_context); 2010 2011 memset(sn, 0, sizeof(*sn)); 2012 2013 /* fill auxiliary fields */ 2014 qemu_gettimeofday(&tv); 2015 sn->date_sec = tv.tv_sec; 2016 sn->date_nsec = tv.tv_usec * 1000; 2017 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 2018 2019 if (name) { 2020 ret = bdrv_snapshot_find(bs, old_sn, name); 2021 if (ret >= 0) { 2022 pstrcpy(sn->name, sizeof(sn->name), old_sn->name); 2023 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str); 2024 } else { 2025 pstrcpy(sn->name, sizeof(sn->name), name); 2026 } 2027 } else { 2028 /* cast below needed for OpenBSD where tv_sec is still 'long' */ 2029 localtime_r((const time_t *)&tv.tv_sec, &tm); 2030 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm); 2031 } 2032 2033 /* save the VM state */ 2034 f = qemu_fopen_bdrv(bs, 1); 2035 if (!f) { 2036 monitor_printf(mon, "Could not open VM state file\n"); 2037 goto the_end; 2038 } 2039 ret = qemu_savevm_state(f, &local_err); 2040 vm_state_size = qemu_ftell(f); 2041 qemu_fclose(f); 2042 if (ret < 0) { 2043 error_report_err(local_err); 2044 goto the_end; 2045 } 2046 2047 ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, &bs); 2048 if (ret < 0) { 2049 monitor_printf(mon, "Error while creating snapshot on '%s'\n", 2050 bdrv_get_device_name(bs)); 2051 } 2052 2053 the_end: 2054 aio_context_release(aio_context); 2055 if (saved_vm_running) { 2056 vm_start(); 2057 } 2058 } 2059 2060 void qmp_xen_save_devices_state(const char *filename, Error **errp) 2061 { 2062 QEMUFile *f; 2063 int saved_vm_running; 2064 int ret; 2065 2066 saved_vm_running = runstate_is_running(); 2067 vm_stop(RUN_STATE_SAVE_VM); 2068 global_state_store_running(); 2069 2070 f = qemu_fopen(filename, "wb"); 2071 if (!f) { 2072 error_setg_file_open(errp, errno, filename); 2073 goto the_end; 2074 } 2075 ret = qemu_save_device_state(f); 2076 qemu_fclose(f); 2077 if (ret < 0) { 2078 error_setg(errp, QERR_IO_ERROR); 2079 } 2080 2081 the_end: 2082 if (saved_vm_running) { 2083 vm_start(); 2084 } 2085 } 2086 2087 int load_vmstate(const char *name) 2088 { 2089 BlockDriverState *bs, *bs_vm_state; 2090 QEMUSnapshotInfo sn; 2091 QEMUFile *f; 2092 int ret; 2093 AioContext *aio_context; 2094 2095 if (!bdrv_all_can_snapshot(&bs)) { 2096 error_report("Device '%s' is writable but does not support snapshots.", 2097 bdrv_get_device_name(bs)); 2098 return -ENOTSUP; 2099 } 2100 ret = bdrv_all_find_snapshot(name, &bs); 2101 if (ret < 0) { 2102 error_report("Device '%s' does not have the requested snapshot '%s'", 2103 bdrv_get_device_name(bs), name); 2104 return ret; 2105 } 2106 2107 bs_vm_state = bdrv_all_find_vmstate_bs(); 2108 if (!bs_vm_state) { 2109 error_report("No block device supports snapshots"); 2110 return -ENOTSUP; 2111 } 2112 aio_context = bdrv_get_aio_context(bs_vm_state); 2113 2114 /* Don't even try to load empty VM states */ 2115 aio_context_acquire(aio_context); 2116 ret = bdrv_snapshot_find(bs_vm_state, &sn, name); 2117 aio_context_release(aio_context); 2118 if (ret < 0) { 2119 return ret; 2120 } else if (sn.vm_state_size == 0) { 2121 error_report("This is a disk-only snapshot. Revert to it offline " 2122 "using qemu-img."); 2123 return -EINVAL; 2124 } 2125 2126 /* Flush all IO requests so they don't interfere with the new state. */ 2127 bdrv_drain_all(); 2128 2129 ret = bdrv_all_goto_snapshot(name, &bs); 2130 if (ret < 0) { 2131 error_report("Error %d while activating snapshot '%s' on '%s'", 2132 ret, name, bdrv_get_device_name(bs)); 2133 return ret; 2134 } 2135 2136 /* restore the VM state */ 2137 f = qemu_fopen_bdrv(bs_vm_state, 0); 2138 if (!f) { 2139 error_report("Could not open VM state file"); 2140 return -EINVAL; 2141 } 2142 2143 qemu_system_reset(VMRESET_SILENT); 2144 migration_incoming_state_new(f); 2145 2146 aio_context_acquire(aio_context); 2147 ret = qemu_loadvm_state(f); 2148 qemu_fclose(f); 2149 aio_context_release(aio_context); 2150 2151 migration_incoming_state_destroy(); 2152 if (ret < 0) { 2153 error_report("Error %d while loading VM state", ret); 2154 return ret; 2155 } 2156 2157 return 0; 2158 } 2159 2160 void hmp_delvm(Monitor *mon, const QDict *qdict) 2161 { 2162 BlockDriverState *bs; 2163 Error *err; 2164 const char *name = qdict_get_str(qdict, "name"); 2165 2166 if (bdrv_all_delete_snapshot(name, &bs, &err) < 0) { 2167 error_reportf_err(err, 2168 "Error while deleting snapshot on device '%s': ", 2169 bdrv_get_device_name(bs)); 2170 } 2171 } 2172 2173 void hmp_info_snapshots(Monitor *mon, const QDict *qdict) 2174 { 2175 BlockDriverState *bs, *bs1; 2176 QEMUSnapshotInfo *sn_tab, *sn; 2177 int nb_sns, i; 2178 int total; 2179 int *available_snapshots; 2180 AioContext *aio_context; 2181 2182 bs = bdrv_all_find_vmstate_bs(); 2183 if (!bs) { 2184 monitor_printf(mon, "No available block device supports snapshots\n"); 2185 return; 2186 } 2187 aio_context = bdrv_get_aio_context(bs); 2188 2189 aio_context_acquire(aio_context); 2190 nb_sns = bdrv_snapshot_list(bs, &sn_tab); 2191 aio_context_release(aio_context); 2192 2193 if (nb_sns < 0) { 2194 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns); 2195 return; 2196 } 2197 2198 if (nb_sns == 0) { 2199 monitor_printf(mon, "There is no snapshot available.\n"); 2200 return; 2201 } 2202 2203 available_snapshots = g_new0(int, nb_sns); 2204 total = 0; 2205 for (i = 0; i < nb_sns; i++) { 2206 if (bdrv_all_find_snapshot(sn_tab[i].id_str, &bs1) == 0) { 2207 available_snapshots[total] = i; 2208 total++; 2209 } 2210 } 2211 2212 if (total > 0) { 2213 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL); 2214 monitor_printf(mon, "\n"); 2215 for (i = 0; i < total; i++) { 2216 sn = &sn_tab[available_snapshots[i]]; 2217 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn); 2218 monitor_printf(mon, "\n"); 2219 } 2220 } else { 2221 monitor_printf(mon, "There is no suitable snapshot available\n"); 2222 } 2223 2224 g_free(sn_tab); 2225 g_free(available_snapshots); 2226 2227 } 2228 2229 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev) 2230 { 2231 qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK, 2232 memory_region_name(mr), dev); 2233 } 2234 2235 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev) 2236 { 2237 qemu_ram_unset_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK); 2238 } 2239 2240 void vmstate_register_ram_global(MemoryRegion *mr) 2241 { 2242 vmstate_register_ram(mr, NULL); 2243 } 2244