4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 #include "config-host.h"
26 #include "qemu-common.h"
27 #include "hw/boards.h"
31 #include "monitor/monitor.h"
32 #include "sysemu/sysemu.h"
33 #include "qemu/timer.h"
34 #include "audio/audio.h"
35 #include "migration/migration.h"
36 #include "qemu/sockets.h"
37 #include "qemu/queue.h"
38 #include "sysemu/cpus.h"
39 #include "exec/memory.h"
40 #include "qmp-commands.h"
43 #include "block/snapshot.h"
44 #include "block/qapi.h"
48 #define ETH_P_RARP 0x8035
50 #define ARP_HTYPE_ETH 0x0001
51 #define ARP_PTYPE_IP 0x0800
52 #define ARP_OP_REQUEST_REV 0x3
54 static int announce_self_create(uint8_t *buf,
57 /* Ethernet header. */
58 memset(buf, 0xff, 6); /* destination MAC addr */
59 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
60 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
63 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
64 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
65 *(buf + 18) = 6; /* hardware addr length (ethernet) */
66 *(buf + 19) = 4; /* protocol addr length (IPv4) */
67 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
68 memcpy(buf + 22, mac_addr, 6); /* source hw addr */
69 memset(buf + 28, 0x00, 4); /* source protocol addr */
70 memcpy(buf + 32, mac_addr, 6); /* target hw addr */
71 memset(buf + 38, 0x00, 4); /* target protocol addr */
73 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
74 memset(buf + 42, 0x00, 18);
76 return 60; /* len (FCS will be added by hardware) */
79 static void qemu_announce_self_iter(NICState *nic, void *opaque)
84 trace_qemu_announce_self_iter(qemu_ether_ntoa(&nic->conf->macaddr));
85 len = announce_self_create(buf, nic->conf->macaddr.a);
87 qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
91 static void qemu_announce_self_once(void *opaque)
93 static int count = SELF_ANNOUNCE_ROUNDS;
94 QEMUTimer *timer = *(QEMUTimer **)opaque;
96 qemu_foreach_nic(qemu_announce_self_iter, NULL);
99 /* delay 50ms, 150ms, 250ms, ... */
100 timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) +
101 self_announce_delay(count));
108 void qemu_announce_self(void)
110 static QEMUTimer *timer;
111 timer = timer_new_ms(QEMU_CLOCK_REALTIME, qemu_announce_self_once, &timer);
112 qemu_announce_self_once(&timer);
115 /***********************************************************/
116 /* savevm/loadvm support */
118 static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
124 qemu_iovec_init_external(&qiov, iov, iovcnt);
125 ret = bdrv_writev_vmstate(opaque, &qiov, pos);
133 static int block_put_buffer(void *opaque, const uint8_t *buf,
134 int64_t pos, int size)
136 bdrv_save_vmstate(opaque, buf, pos, size);
140 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
142 return bdrv_load_vmstate(opaque, buf, pos, size);
145 static int bdrv_fclose(void *opaque)
147 return bdrv_flush(opaque);
150 static const QEMUFileOps bdrv_read_ops = {
151 .get_buffer = block_get_buffer,
155 static const QEMUFileOps bdrv_write_ops = {
156 .put_buffer = block_put_buffer,
157 .writev_buffer = block_writev_buffer,
161 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
164 return qemu_fopen_ops(bs, &bdrv_write_ops);
166 return qemu_fopen_ops(bs, &bdrv_read_ops);
170 /* QEMUFile timer support.
171 * Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c
174 void timer_put(QEMUFile *f, QEMUTimer *ts)
176 uint64_t expire_time;
178 expire_time = timer_expire_time_ns(ts);
179 qemu_put_be64(f, expire_time);
182 void timer_get(QEMUFile *f, QEMUTimer *ts)
184 uint64_t expire_time;
186 expire_time = qemu_get_be64(f);
187 if (expire_time != -1) {
188 timer_mod_ns(ts, expire_time);
195 /* VMState timer support.
196 * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c
199 static int get_timer(QEMUFile *f, void *pv, size_t size)
206 static void put_timer(QEMUFile *f, void *pv, size_t size)
212 const VMStateInfo vmstate_info_timer = {
219 typedef struct CompatEntry {
224 typedef struct SaveStateEntry {
225 QTAILQ_ENTRY(SaveStateEntry) entry;
232 const VMStateDescription *vmsd;
239 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
240 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
241 static int global_section_id;
243 static void dump_vmstate_vmsd(FILE *out_file,
244 const VMStateDescription *vmsd, int indent,
247 static void dump_vmstate_vmsf(FILE *out_file, const VMStateField *field,
250 fprintf(out_file, "%*s{\n", indent, "");
252 fprintf(out_file, "%*s\"field\": \"%s\",\n", indent, "", field->name);
253 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "",
255 fprintf(out_file, "%*s\"field_exists\": %s,\n", indent, "",
256 field->field_exists ? "true" : "false");
257 fprintf(out_file, "%*s\"size\": %zu", indent, "", field->size);
258 if (field->vmsd != NULL) {
259 fprintf(out_file, ",\n");
260 dump_vmstate_vmsd(out_file, field->vmsd, indent, false);
262 fprintf(out_file, "\n%*s}", indent - 2, "");
265 static void dump_vmstate_vmss(FILE *out_file,
266 const VMStateSubsection *subsection,
269 if (subsection->vmsd != NULL) {
270 dump_vmstate_vmsd(out_file, subsection->vmsd, indent, true);
274 static void dump_vmstate_vmsd(FILE *out_file,
275 const VMStateDescription *vmsd, int indent,
279 fprintf(out_file, "%*s{\n", indent, "");
281 fprintf(out_file, "%*s\"%s\": {\n", indent, "", "Description");
284 fprintf(out_file, "%*s\"name\": \"%s\",\n", indent, "", vmsd->name);
285 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "",
287 fprintf(out_file, "%*s\"minimum_version_id\": %d", indent, "",
288 vmsd->minimum_version_id);
289 if (vmsd->fields != NULL) {
290 const VMStateField *field = vmsd->fields;
293 fprintf(out_file, ",\n%*s\"Fields\": [\n", indent, "");
295 while (field->name != NULL) {
296 if (field->flags & VMS_MUST_EXIST) {
297 /* Ignore VMSTATE_VALIDATE bits; these don't get migrated */
302 fprintf(out_file, ",\n");
304 dump_vmstate_vmsf(out_file, field, indent + 2);
308 fprintf(out_file, "\n%*s]", indent, "");
310 if (vmsd->subsections != NULL) {
311 const VMStateSubsection *subsection = vmsd->subsections;
314 fprintf(out_file, ",\n%*s\"Subsections\": [\n", indent, "");
316 while (subsection->vmsd != NULL) {
318 fprintf(out_file, ",\n");
320 dump_vmstate_vmss(out_file, subsection, indent + 2);
324 fprintf(out_file, "\n%*s]", indent, "");
326 fprintf(out_file, "\n%*s}", indent - 2, "");
329 static void dump_machine_type(FILE *out_file)
333 mc = MACHINE_GET_CLASS(current_machine);
335 fprintf(out_file, " \"vmschkmachine\": {\n");
336 fprintf(out_file, " \"Name\": \"%s\"\n", mc->name);
337 fprintf(out_file, " },\n");
340 void dump_vmstate_json_to_file(FILE *out_file)
345 fprintf(out_file, "{\n");
346 dump_machine_type(out_file);
349 list = object_class_get_list(TYPE_DEVICE, true);
350 for (elt = list; elt; elt = elt->next) {
351 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
361 fprintf(out_file, ",\n");
363 name = object_class_get_name(OBJECT_CLASS(dc));
364 fprintf(out_file, "%*s\"%s\": {\n", indent, "", name);
366 fprintf(out_file, "%*s\"Name\": \"%s\",\n", indent, "", name);
367 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "",
368 dc->vmsd->version_id);
369 fprintf(out_file, "%*s\"minimum_version_id\": %d,\n", indent, "",
370 dc->vmsd->minimum_version_id);
372 dump_vmstate_vmsd(out_file, dc->vmsd, indent, false);
374 fprintf(out_file, "\n%*s}", indent - 2, "");
377 fprintf(out_file, "\n}\n");
381 static int calculate_new_instance_id(const char *idstr)
386 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
387 if (strcmp(idstr, se->idstr) == 0
388 && instance_id <= se->instance_id) {
389 instance_id = se->instance_id + 1;
395 static int calculate_compat_instance_id(const char *idstr)
400 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
405 if (strcmp(idstr, se->compat->idstr) == 0
406 && instance_id <= se->compat->instance_id) {
407 instance_id = se->compat->instance_id + 1;
413 /* TODO: Individual devices generally have very little idea about the rest
414 of the system, so instance_id should be removed/replaced.
415 Meanwhile pass -1 as instance_id if you do not already have a clearly
416 distinguishing id for all instances of your device class. */
417 int register_savevm_live(DeviceState *dev,
426 se = g_malloc0(sizeof(SaveStateEntry));
427 se->version_id = version_id;
428 se->section_id = global_section_id++;
432 /* if this is a live_savem then set is_ram */
433 if (ops->save_live_setup != NULL) {
438 char *id = qdev_get_dev_path(dev);
440 pstrcpy(se->idstr, sizeof(se->idstr), id);
441 pstrcat(se->idstr, sizeof(se->idstr), "/");
444 se->compat = g_malloc0(sizeof(CompatEntry));
445 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
446 se->compat->instance_id = instance_id == -1 ?
447 calculate_compat_instance_id(idstr) : instance_id;
451 pstrcat(se->idstr, sizeof(se->idstr), idstr);
453 if (instance_id == -1) {
454 se->instance_id = calculate_new_instance_id(se->idstr);
456 se->instance_id = instance_id;
458 assert(!se->compat || se->instance_id == 0);
459 /* add at the end of list */
460 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
464 int register_savevm(DeviceState *dev,
468 SaveStateHandler *save_state,
469 LoadStateHandler *load_state,
472 SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
473 ops->save_state = save_state;
474 ops->load_state = load_state;
475 return register_savevm_live(dev, idstr, instance_id, version_id,
479 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
481 SaveStateEntry *se, *new_se;
485 char *path = qdev_get_dev_path(dev);
487 pstrcpy(id, sizeof(id), path);
488 pstrcat(id, sizeof(id), "/");
492 pstrcat(id, sizeof(id), idstr);
494 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
495 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
496 QTAILQ_REMOVE(&savevm_handlers, se, entry);
506 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
507 const VMStateDescription *vmsd,
508 void *opaque, int alias_id,
509 int required_for_version)
513 /* If this triggers, alias support can be dropped for the vmsd. */
514 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
516 se = g_malloc0(sizeof(SaveStateEntry));
517 se->version_id = vmsd->version_id;
518 se->section_id = global_section_id++;
521 se->alias_id = alias_id;
524 char *id = qdev_get_dev_path(dev);
526 pstrcpy(se->idstr, sizeof(se->idstr), id);
527 pstrcat(se->idstr, sizeof(se->idstr), "/");
530 se->compat = g_malloc0(sizeof(CompatEntry));
531 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
532 se->compat->instance_id = instance_id == -1 ?
533 calculate_compat_instance_id(vmsd->name) : instance_id;
537 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
539 if (instance_id == -1) {
540 se->instance_id = calculate_new_instance_id(se->idstr);
542 se->instance_id = instance_id;
544 assert(!se->compat || se->instance_id == 0);
545 /* add at the end of list */
546 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
550 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
553 SaveStateEntry *se, *new_se;
555 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
556 if (se->vmsd == vmsd && se->opaque == opaque) {
557 QTAILQ_REMOVE(&savevm_handlers, se, entry);
566 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
568 trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
569 if (!se->vmsd) { /* Old style */
570 return se->ops->load_state(f, se->opaque, version_id);
572 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
575 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
577 trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
578 if (!se->vmsd) { /* Old style */
579 se->ops->save_state(f, se->opaque);
582 vmstate_save_state(f, se->vmsd, se->opaque);
585 bool qemu_savevm_state_blocked(Error **errp)
589 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
590 if (se->vmsd && se->vmsd->unmigratable) {
591 error_setg(errp, "State blocked by non-migratable device '%s'",
599 void qemu_savevm_state_begin(QEMUFile *f,
600 const MigrationParams *params)
605 trace_savevm_state_begin();
606 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
607 if (!se->ops || !se->ops->set_params) {
610 se->ops->set_params(params, se->opaque);
613 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
614 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
616 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
619 if (!se->ops || !se->ops->save_live_setup) {
622 if (se->ops && se->ops->is_active) {
623 if (!se->ops->is_active(se->opaque)) {
628 qemu_put_byte(f, QEMU_VM_SECTION_START);
629 qemu_put_be32(f, se->section_id);
632 len = strlen(se->idstr);
633 qemu_put_byte(f, len);
634 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
636 qemu_put_be32(f, se->instance_id);
637 qemu_put_be32(f, se->version_id);
639 ret = se->ops->save_live_setup(f, se->opaque);
641 qemu_file_set_error(f, ret);
648 * this function has three return values:
649 * negative: there was one error, and we have -errno.
650 * 0 : We haven't finished, caller have to go again
651 * 1 : We have finished, we can go to complete phase
653 int qemu_savevm_state_iterate(QEMUFile *f)
658 trace_savevm_state_iterate();
659 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
660 if (!se->ops || !se->ops->save_live_iterate) {
663 if (se->ops && se->ops->is_active) {
664 if (!se->ops->is_active(se->opaque)) {
668 if (qemu_file_rate_limit(f)) {
671 trace_savevm_section_start(se->idstr, se->section_id);
673 qemu_put_byte(f, QEMU_VM_SECTION_PART);
674 qemu_put_be32(f, se->section_id);
676 ret = se->ops->save_live_iterate(f, se->opaque);
677 trace_savevm_section_end(se->idstr, se->section_id);
680 qemu_file_set_error(f, ret);
683 /* Do not proceed to the next vmstate before this one reported
684 completion of the current stage. This serializes the migration
685 and reduces the probability that a faster changing state is
686 synchronized over and over again. */
693 void qemu_savevm_state_complete(QEMUFile *f)
698 trace_savevm_state_complete();
700 cpu_synchronize_all_states();
702 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
703 if (!se->ops || !se->ops->save_live_complete) {
706 if (se->ops && se->ops->is_active) {
707 if (!se->ops->is_active(se->opaque)) {
711 trace_savevm_section_start(se->idstr, se->section_id);
713 qemu_put_byte(f, QEMU_VM_SECTION_END);
714 qemu_put_be32(f, se->section_id);
716 ret = se->ops->save_live_complete(f, se->opaque);
717 trace_savevm_section_end(se->idstr, se->section_id);
719 qemu_file_set_error(f, ret);
724 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
727 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
730 trace_savevm_section_start(se->idstr, se->section_id);
732 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
733 qemu_put_be32(f, se->section_id);
736 len = strlen(se->idstr);
737 qemu_put_byte(f, len);
738 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
740 qemu_put_be32(f, se->instance_id);
741 qemu_put_be32(f, se->version_id);
744 trace_savevm_section_end(se->idstr, se->section_id);
747 qemu_put_byte(f, QEMU_VM_EOF);
751 uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
756 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
757 if (!se->ops || !se->ops->save_live_pending) {
760 if (se->ops && se->ops->is_active) {
761 if (!se->ops->is_active(se->opaque)) {
765 ret += se->ops->save_live_pending(f, se->opaque, max_size);
770 void qemu_savevm_state_cancel(void)
774 trace_savevm_state_cancel();
775 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
776 if (se->ops && se->ops->cancel) {
777 se->ops->cancel(se->opaque);
782 static int qemu_savevm_state(QEMUFile *f)
785 MigrationParams params = {
790 if (qemu_savevm_state_blocked(NULL)) {
794 qemu_mutex_unlock_iothread();
795 qemu_savevm_state_begin(f, ¶ms);
796 qemu_mutex_lock_iothread();
798 while (qemu_file_get_error(f) == 0) {
799 if (qemu_savevm_state_iterate(f) > 0) {
804 ret = qemu_file_get_error(f);
806 qemu_savevm_state_complete(f);
807 ret = qemu_file_get_error(f);
810 qemu_savevm_state_cancel();
815 static int qemu_save_device_state(QEMUFile *f)
819 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
820 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
822 cpu_synchronize_all_states();
824 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
830 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
835 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
836 qemu_put_be32(f, se->section_id);
839 len = strlen(se->idstr);
840 qemu_put_byte(f, len);
841 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
843 qemu_put_be32(f, se->instance_id);
844 qemu_put_be32(f, se->version_id);
849 qemu_put_byte(f, QEMU_VM_EOF);
851 return qemu_file_get_error(f);
854 static SaveStateEntry *find_se(const char *idstr, int instance_id)
858 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
859 if (!strcmp(se->idstr, idstr) &&
860 (instance_id == se->instance_id ||
861 instance_id == se->alias_id))
863 /* Migrating from an older version? */
864 if (strstr(se->idstr, idstr) && se->compat) {
865 if (!strcmp(se->compat->idstr, idstr) &&
866 (instance_id == se->compat->instance_id ||
867 instance_id == se->alias_id))
874 typedef struct LoadStateEntry {
875 QLIST_ENTRY(LoadStateEntry) entry;
881 int qemu_loadvm_state(QEMUFile *f)
883 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
884 QLIST_HEAD_INITIALIZER(loadvm_handlers);
885 LoadStateEntry *le, *new_le;
886 uint8_t section_type;
890 if (qemu_savevm_state_blocked(NULL)) {
894 v = qemu_get_be32(f);
895 if (v != QEMU_VM_FILE_MAGIC) {
899 v = qemu_get_be32(f);
900 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
901 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
904 if (v != QEMU_VM_FILE_VERSION) {
908 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
909 uint32_t instance_id, version_id, section_id;
914 switch (section_type) {
915 case QEMU_VM_SECTION_START:
916 case QEMU_VM_SECTION_FULL:
917 /* Read section start */
918 section_id = qemu_get_be32(f);
919 len = qemu_get_byte(f);
920 qemu_get_buffer(f, (uint8_t *)idstr, len);
922 instance_id = qemu_get_be32(f);
923 version_id = qemu_get_be32(f);
925 /* Find savevm section */
926 se = find_se(idstr, instance_id);
928 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
933 /* Validate version */
934 if (version_id > se->version_id) {
935 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
936 version_id, idstr, se->version_id);
942 le = g_malloc0(sizeof(*le));
945 le->section_id = section_id;
946 le->version_id = version_id;
947 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
949 ret = vmstate_load(f, le->se, le->version_id);
951 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
956 case QEMU_VM_SECTION_PART:
957 case QEMU_VM_SECTION_END:
958 section_id = qemu_get_be32(f);
960 QLIST_FOREACH(le, &loadvm_handlers, entry) {
961 if (le->section_id == section_id) {
966 fprintf(stderr, "Unknown savevm section %d\n", section_id);
971 ret = vmstate_load(f, le->se, le->version_id);
973 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
979 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
985 cpu_synchronize_all_post_init();
990 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
991 QLIST_REMOVE(le, entry);
996 ret = qemu_file_get_error(f);
1002 static BlockDriverState *find_vmstate_bs(void)
1004 BlockDriverState *bs = NULL;
1005 while ((bs = bdrv_next(bs))) {
1006 if (bdrv_can_snapshot(bs)) {
1014 * Deletes snapshots of a given name in all opened images.
1016 static int del_existing_snapshots(Monitor *mon, const char *name)
1018 BlockDriverState *bs;
1019 QEMUSnapshotInfo sn1, *snapshot = &sn1;
1023 while ((bs = bdrv_next(bs))) {
1024 if (bdrv_can_snapshot(bs) &&
1025 bdrv_snapshot_find(bs, snapshot, name) >= 0) {
1026 bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
1029 "Error while deleting snapshot on device '%s':"
1031 bdrv_get_device_name(bs),
1032 error_get_pretty(err));
1042 void do_savevm(Monitor *mon, const QDict *qdict)
1044 BlockDriverState *bs, *bs1;
1045 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1048 int saved_vm_running;
1049 uint64_t vm_state_size;
1052 const char *name = qdict_get_try_str(qdict, "name");
1054 /* Verify if there is a device that doesn't support snapshots and is writable */
1056 while ((bs = bdrv_next(bs))) {
1058 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
1062 if (!bdrv_can_snapshot(bs)) {
1063 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1064 bdrv_get_device_name(bs));
1069 bs = find_vmstate_bs();
1071 monitor_printf(mon, "No block device can accept snapshots\n");
1075 saved_vm_running = runstate_is_running();
1076 vm_stop(RUN_STATE_SAVE_VM);
1078 memset(sn, 0, sizeof(*sn));
1080 /* fill auxiliary fields */
1081 qemu_gettimeofday(&tv);
1082 sn->date_sec = tv.tv_sec;
1083 sn->date_nsec = tv.tv_usec * 1000;
1084 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1087 ret = bdrv_snapshot_find(bs, old_sn, name);
1089 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1090 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1092 pstrcpy(sn->name, sizeof(sn->name), name);
1095 /* cast below needed for OpenBSD where tv_sec is still 'long' */
1096 localtime_r((const time_t *)&tv.tv_sec, &tm);
1097 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
1100 /* Delete old snapshots of the same name */
1101 if (name && del_existing_snapshots(mon, name) < 0) {
1105 /* save the VM state */
1106 f = qemu_fopen_bdrv(bs, 1);
1108 monitor_printf(mon, "Could not open VM state file\n");
1111 ret = qemu_savevm_state(f);
1112 vm_state_size = qemu_ftell(f);
1115 monitor_printf(mon, "Error %d while writing VM\n", ret);
1119 /* create the snapshots */
1122 while ((bs1 = bdrv_next(bs1))) {
1123 if (bdrv_can_snapshot(bs1)) {
1124 /* Write VM state size only to the image that contains the state */
1125 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1126 ret = bdrv_snapshot_create(bs1, sn);
1128 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1129 bdrv_get_device_name(bs1));
1135 if (saved_vm_running) {
1140 void qmp_xen_save_devices_state(const char *filename, Error **errp)
1143 int saved_vm_running;
1146 saved_vm_running = runstate_is_running();
1147 vm_stop(RUN_STATE_SAVE_VM);
1149 f = qemu_fopen(filename, "wb");
1151 error_setg_file_open(errp, errno, filename);
1154 ret = qemu_save_device_state(f);
1157 error_set(errp, QERR_IO_ERROR);
1161 if (saved_vm_running) {
1166 int load_vmstate(const char *name)
1168 BlockDriverState *bs, *bs_vm_state;
1169 QEMUSnapshotInfo sn;
1173 bs_vm_state = find_vmstate_bs();
1175 error_report("No block device supports snapshots");
1179 /* Don't even try to load empty VM states */
1180 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
1183 } else if (sn.vm_state_size == 0) {
1184 error_report("This is a disk-only snapshot. Revert to it offline "
1189 /* Verify if there is any device that doesn't support snapshots and is
1190 writable and check if the requested snapshot is available too. */
1192 while ((bs = bdrv_next(bs))) {
1194 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
1198 if (!bdrv_can_snapshot(bs)) {
1199 error_report("Device '%s' is writable but does not support snapshots.",
1200 bdrv_get_device_name(bs));
1204 ret = bdrv_snapshot_find(bs, &sn, name);
1206 error_report("Device '%s' does not have the requested snapshot '%s'",
1207 bdrv_get_device_name(bs), name);
1212 /* Flush all IO requests so they don't interfere with the new state. */
1216 while ((bs = bdrv_next(bs))) {
1217 if (bdrv_can_snapshot(bs)) {
1218 ret = bdrv_snapshot_goto(bs, name);
1220 error_report("Error %d while activating snapshot '%s' on '%s'",
1221 ret, name, bdrv_get_device_name(bs));
1227 /* restore the VM state */
1228 f = qemu_fopen_bdrv(bs_vm_state, 0);
1230 error_report("Could not open VM state file");
1234 qemu_system_reset(VMRESET_SILENT);
1235 ret = qemu_loadvm_state(f);
1239 error_report("Error %d while loading VM state", ret);
1246 void do_delvm(Monitor *mon, const QDict *qdict)
1248 BlockDriverState *bs;
1250 const char *name = qdict_get_str(qdict, "name");
1252 if (!find_vmstate_bs()) {
1253 monitor_printf(mon, "No block device supports snapshots\n");
1258 while ((bs = bdrv_next(bs))) {
1259 if (bdrv_can_snapshot(bs)) {
1261 bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
1264 "Error while deleting snapshot on device '%s':"
1266 bdrv_get_device_name(bs),
1267 error_get_pretty(err));
1274 void do_info_snapshots(Monitor *mon, const QDict *qdict)
1276 BlockDriverState *bs, *bs1;
1277 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
1278 int nb_sns, i, ret, available;
1280 int *available_snapshots;
1282 bs = find_vmstate_bs();
1284 monitor_printf(mon, "No available block device supports snapshots\n");
1288 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1290 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1295 monitor_printf(mon, "There is no snapshot available.\n");
1299 available_snapshots = g_malloc0(sizeof(int) * nb_sns);
1301 for (i = 0; i < nb_sns; i++) {
1306 while ((bs1 = bdrv_next(bs1))) {
1307 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
1308 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
1317 available_snapshots[total] = i;
1323 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL);
1324 monitor_printf(mon, "\n");
1325 for (i = 0; i < total; i++) {
1326 sn = &sn_tab[available_snapshots[i]];
1327 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn);
1328 monitor_printf(mon, "\n");
1331 monitor_printf(mon, "There is no suitable snapshot available\n");
1335 g_free(available_snapshots);
1339 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
1341 qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
1342 memory_region_name(mr), dev);
1345 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
1347 qemu_ram_unset_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK);
1350 void vmstate_register_ram_global(MemoryRegion *mr)
1352 vmstate_register_ram(mr, NULL);