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29#include "qemu/osdep.h"
30#include "hw/boards.h"
31#include "net/net.h"
32#include "migration.h"
33#include "migration/snapshot.h"
34#include "migration/vmstate.h"
35#include "migration/misc.h"
36#include "migration/register.h"
37#include "migration/global_state.h"
38#include "ram.h"
39#include "qemu-file-channel.h"
40#include "qemu-file.h"
41#include "savevm.h"
42#include "postcopy-ram.h"
43#include "qapi/error.h"
44#include "qapi/qapi-commands-migration.h"
45#include "qapi/qmp/json-writer.h"
46#include "qapi/clone-visitor.h"
47#include "qapi/qapi-builtin-visit.h"
48#include "qapi/qmp/qerror.h"
49#include "qemu/error-report.h"
50#include "sysemu/cpus.h"
51#include "exec/memory.h"
52#include "exec/target_page.h"
53#include "trace.h"
54#include "qemu/iov.h"
55#include "qemu/main-loop.h"
56#include "block/snapshot.h"
57#include "qemu/cutils.h"
58#include "io/channel-buffer.h"
59#include "io/channel-file.h"
60#include "sysemu/replay.h"
61#include "sysemu/runstate.h"
62#include "sysemu/sysemu.h"
63#include "sysemu/xen.h"
64#include "migration/colo.h"
65#include "qemu/bitmap.h"
66#include "net/announce.h"
67#include "qemu/yank.h"
68#include "yank_functions.h"
69
70const unsigned int postcopy_ram_discard_version;
71
72
73enum qemu_vm_cmd {
74 MIG_CMD_INVALID = 0,
75 MIG_CMD_OPEN_RETURN_PATH,
76 MIG_CMD_PING,
77
78 MIG_CMD_POSTCOPY_ADVISE,
79
80 MIG_CMD_POSTCOPY_LISTEN,
81
82 MIG_CMD_POSTCOPY_RUN,
83
84 MIG_CMD_POSTCOPY_RAM_DISCARD,
85
86
87 MIG_CMD_PACKAGED,
88 MIG_CMD_ENABLE_COLO,
89 MIG_CMD_POSTCOPY_RESUME,
90 MIG_CMD_RECV_BITMAP,
91 MIG_CMD_MAX
92};
93
94#define MAX_VM_CMD_PACKAGED_SIZE UINT32_MAX
95static struct mig_cmd_args {
96 ssize_t len;
97 const char *name;
98} mig_cmd_args[] = {
99 [MIG_CMD_INVALID] = { .len = -1, .name = "INVALID" },
100 [MIG_CMD_OPEN_RETURN_PATH] = { .len = 0, .name = "OPEN_RETURN_PATH" },
101 [MIG_CMD_PING] = { .len = sizeof(uint32_t), .name = "PING" },
102 [MIG_CMD_POSTCOPY_ADVISE] = { .len = -1, .name = "POSTCOPY_ADVISE" },
103 [MIG_CMD_POSTCOPY_LISTEN] = { .len = 0, .name = "POSTCOPY_LISTEN" },
104 [MIG_CMD_POSTCOPY_RUN] = { .len = 0, .name = "POSTCOPY_RUN" },
105 [MIG_CMD_POSTCOPY_RAM_DISCARD] = {
106 .len = -1, .name = "POSTCOPY_RAM_DISCARD" },
107 [MIG_CMD_POSTCOPY_RESUME] = { .len = 0, .name = "POSTCOPY_RESUME" },
108 [MIG_CMD_PACKAGED] = { .len = 4, .name = "PACKAGED" },
109 [MIG_CMD_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" },
110 [MIG_CMD_MAX] = { .len = -1, .name = "MAX" },
111};
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132
133static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
134 int64_t pos, Error **errp)
135{
136 int ret;
137 QEMUIOVector qiov;
138
139 qemu_iovec_init_external(&qiov, iov, iovcnt);
140 ret = bdrv_writev_vmstate(opaque, &qiov, pos);
141 if (ret < 0) {
142 return ret;
143 }
144
145 return qiov.size;
146}
147
148static ssize_t block_get_buffer(void *opaque, uint8_t *buf, int64_t pos,
149 size_t size, Error **errp)
150{
151 return bdrv_load_vmstate(opaque, buf, pos, size);
152}
153
154static int bdrv_fclose(void *opaque, Error **errp)
155{
156 return bdrv_flush(opaque);
157}
158
159static const QEMUFileOps bdrv_read_ops = {
160 .get_buffer = block_get_buffer,
161 .close = bdrv_fclose
162};
163
164static const QEMUFileOps bdrv_write_ops = {
165 .writev_buffer = block_writev_buffer,
166 .close = bdrv_fclose
167};
168
169static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
170{
171 if (is_writable) {
172 return qemu_fopen_ops(bs, &bdrv_write_ops, false);
173 }
174 return qemu_fopen_ops(bs, &bdrv_read_ops, false);
175}
176
177
178
179
180
181
182void timer_put(QEMUFile *f, QEMUTimer *ts)
183{
184 uint64_t expire_time;
185
186 expire_time = timer_expire_time_ns(ts);
187 qemu_put_be64(f, expire_time);
188}
189
190void timer_get(QEMUFile *f, QEMUTimer *ts)
191{
192 uint64_t expire_time;
193
194 expire_time = qemu_get_be64(f);
195 if (expire_time != -1) {
196 timer_mod_ns(ts, expire_time);
197 } else {
198 timer_del(ts);
199 }
200}
201
202
203
204
205
206
207static int get_timer(QEMUFile *f, void *pv, size_t size,
208 const VMStateField *field)
209{
210 QEMUTimer *v = pv;
211 timer_get(f, v);
212 return 0;
213}
214
215static int put_timer(QEMUFile *f, void *pv, size_t size,
216 const VMStateField *field, JSONWriter *vmdesc)
217{
218 QEMUTimer *v = pv;
219 timer_put(f, v);
220
221 return 0;
222}
223
224const VMStateInfo vmstate_info_timer = {
225 .name = "timer",
226 .get = get_timer,
227 .put = put_timer,
228};
229
230
231typedef struct CompatEntry {
232 char idstr[256];
233 int instance_id;
234} CompatEntry;
235
236typedef struct SaveStateEntry {
237 QTAILQ_ENTRY(SaveStateEntry) entry;
238 char idstr[256];
239 uint32_t instance_id;
240 int alias_id;
241 int version_id;
242
243 int load_version_id;
244 int section_id;
245
246 int load_section_id;
247 const SaveVMHandlers *ops;
248 const VMStateDescription *vmsd;
249 void *opaque;
250 CompatEntry *compat;
251 int is_ram;
252} SaveStateEntry;
253
254typedef struct SaveState {
255 QTAILQ_HEAD(, SaveStateEntry) handlers;
256 SaveStateEntry *handler_pri_head[MIG_PRI_MAX + 1];
257 int global_section_id;
258 uint32_t len;
259 const char *name;
260 uint32_t target_page_bits;
261 uint32_t caps_count;
262 MigrationCapability *capabilities;
263 QemuUUID uuid;
264} SaveState;
265
266static SaveState savevm_state = {
267 .handlers = QTAILQ_HEAD_INITIALIZER(savevm_state.handlers),
268 .handler_pri_head = { [MIG_PRI_DEFAULT ... MIG_PRI_MAX] = NULL },
269 .global_section_id = 0,
270};
271
272static bool should_validate_capability(int capability)
273{
274 assert(capability >= 0 && capability < MIGRATION_CAPABILITY__MAX);
275
276 switch (capability) {
277 case MIGRATION_CAPABILITY_X_IGNORE_SHARED:
278 return true;
279 default:
280 return false;
281 }
282}
283
284static uint32_t get_validatable_capabilities_count(void)
285{
286 MigrationState *s = migrate_get_current();
287 uint32_t result = 0;
288 int i;
289 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
290 if (should_validate_capability(i) && s->enabled_capabilities[i]) {
291 result++;
292 }
293 }
294 return result;
295}
296
297static int configuration_pre_save(void *opaque)
298{
299 SaveState *state = opaque;
300 const char *current_name = MACHINE_GET_CLASS(current_machine)->name;
301 MigrationState *s = migrate_get_current();
302 int i, j;
303
304 state->len = strlen(current_name);
305 state->name = current_name;
306 state->target_page_bits = qemu_target_page_bits();
307
308 state->caps_count = get_validatable_capabilities_count();
309 state->capabilities = g_renew(MigrationCapability, state->capabilities,
310 state->caps_count);
311 for (i = j = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
312 if (should_validate_capability(i) && s->enabled_capabilities[i]) {
313 state->capabilities[j++] = i;
314 }
315 }
316 state->uuid = qemu_uuid;
317
318 return 0;
319}
320
321static int configuration_post_save(void *opaque)
322{
323 SaveState *state = opaque;
324
325 g_free(state->capabilities);
326 state->capabilities = NULL;
327 state->caps_count = 0;
328 return 0;
329}
330
331static int configuration_pre_load(void *opaque)
332{
333 SaveState *state = opaque;
334
335
336
337
338
339 state->target_page_bits = qemu_target_page_bits_min();
340 return 0;
341}
342
343static bool configuration_validate_capabilities(SaveState *state)
344{
345 bool ret = true;
346 MigrationState *s = migrate_get_current();
347 unsigned long *source_caps_bm;
348 int i;
349
350 source_caps_bm = bitmap_new(MIGRATION_CAPABILITY__MAX);
351 for (i = 0; i < state->caps_count; i++) {
352 MigrationCapability capability = state->capabilities[i];
353 set_bit(capability, source_caps_bm);
354 }
355
356 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
357 bool source_state, target_state;
358 if (!should_validate_capability(i)) {
359 continue;
360 }
361 source_state = test_bit(i, source_caps_bm);
362 target_state = s->enabled_capabilities[i];
363 if (source_state != target_state) {
364 error_report("Capability %s is %s, but received capability is %s",
365 MigrationCapability_str(i),
366 target_state ? "on" : "off",
367 source_state ? "on" : "off");
368 ret = false;
369
370 }
371 }
372
373 g_free(source_caps_bm);
374 return ret;
375}
376
377static int configuration_post_load(void *opaque, int version_id)
378{
379 SaveState *state = opaque;
380 const char *current_name = MACHINE_GET_CLASS(current_machine)->name;
381 int ret = 0;
382
383 if (strncmp(state->name, current_name, state->len) != 0) {
384 error_report("Machine type received is '%.*s' and local is '%s'",
385 (int) state->len, state->name, current_name);
386 ret = -EINVAL;
387 goto out;
388 }
389
390 if (state->target_page_bits != qemu_target_page_bits()) {
391 error_report("Received TARGET_PAGE_BITS is %d but local is %d",
392 state->target_page_bits, qemu_target_page_bits());
393 ret = -EINVAL;
394 goto out;
395 }
396
397 if (!configuration_validate_capabilities(state)) {
398 ret = -EINVAL;
399 goto out;
400 }
401
402out:
403 g_free((void *)state->name);
404 state->name = NULL;
405 state->len = 0;
406 g_free(state->capabilities);
407 state->capabilities = NULL;
408 state->caps_count = 0;
409
410 return ret;
411}
412
413static int get_capability(QEMUFile *f, void *pv, size_t size,
414 const VMStateField *field)
415{
416 MigrationCapability *capability = pv;
417 char capability_str[UINT8_MAX + 1];
418 uint8_t len;
419 int i;
420
421 len = qemu_get_byte(f);
422 qemu_get_buffer(f, (uint8_t *)capability_str, len);
423 capability_str[len] = '\0';
424 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
425 if (!strcmp(MigrationCapability_str(i), capability_str)) {
426 *capability = i;
427 return 0;
428 }
429 }
430 error_report("Received unknown capability %s", capability_str);
431 return -EINVAL;
432}
433
434static int put_capability(QEMUFile *f, void *pv, size_t size,
435 const VMStateField *field, JSONWriter *vmdesc)
436{
437 MigrationCapability *capability = pv;
438 const char *capability_str = MigrationCapability_str(*capability);
439 size_t len = strlen(capability_str);
440 assert(len <= UINT8_MAX);
441
442 qemu_put_byte(f, len);
443 qemu_put_buffer(f, (uint8_t *)capability_str, len);
444 return 0;
445}
446
447static const VMStateInfo vmstate_info_capability = {
448 .name = "capability",
449 .get = get_capability,
450 .put = put_capability,
451};
452
453
454
455
456
457
458
459
460static bool vmstate_target_page_bits_needed(void *opaque)
461{
462 return qemu_target_page_bits()
463 > qemu_target_page_bits_min();
464}
465
466static const VMStateDescription vmstate_target_page_bits = {
467 .name = "configuration/target-page-bits",
468 .version_id = 1,
469 .minimum_version_id = 1,
470 .needed = vmstate_target_page_bits_needed,
471 .fields = (VMStateField[]) {
472 VMSTATE_UINT32(target_page_bits, SaveState),
473 VMSTATE_END_OF_LIST()
474 }
475};
476
477static bool vmstate_capabilites_needed(void *opaque)
478{
479 return get_validatable_capabilities_count() > 0;
480}
481
482static const VMStateDescription vmstate_capabilites = {
483 .name = "configuration/capabilities",
484 .version_id = 1,
485 .minimum_version_id = 1,
486 .needed = vmstate_capabilites_needed,
487 .fields = (VMStateField[]) {
488 VMSTATE_UINT32_V(caps_count, SaveState, 1),
489 VMSTATE_VARRAY_UINT32_ALLOC(capabilities, SaveState, caps_count, 1,
490 vmstate_info_capability,
491 MigrationCapability),
492 VMSTATE_END_OF_LIST()
493 }
494};
495
496static bool vmstate_uuid_needed(void *opaque)
497{
498 return qemu_uuid_set && migrate_validate_uuid();
499}
500
501static int vmstate_uuid_post_load(void *opaque, int version_id)
502{
503 SaveState *state = opaque;
504 char uuid_src[UUID_FMT_LEN + 1];
505 char uuid_dst[UUID_FMT_LEN + 1];
506
507 if (!qemu_uuid_set) {
508
509
510
511
512 qemu_uuid_unparse(&state->uuid, uuid_src);
513 warn_report("UUID is received %s, but local uuid isn't set",
514 uuid_src);
515 return 0;
516 }
517 if (!qemu_uuid_is_equal(&state->uuid, &qemu_uuid)) {
518 qemu_uuid_unparse(&state->uuid, uuid_src);
519 qemu_uuid_unparse(&qemu_uuid, uuid_dst);
520 error_report("UUID received is %s and local is %s", uuid_src, uuid_dst);
521 return -EINVAL;
522 }
523 return 0;
524}
525
526static const VMStateDescription vmstate_uuid = {
527 .name = "configuration/uuid",
528 .version_id = 1,
529 .minimum_version_id = 1,
530 .needed = vmstate_uuid_needed,
531 .post_load = vmstate_uuid_post_load,
532 .fields = (VMStateField[]) {
533 VMSTATE_UINT8_ARRAY_V(uuid.data, SaveState, sizeof(QemuUUID), 1),
534 VMSTATE_END_OF_LIST()
535 }
536};
537
538static const VMStateDescription vmstate_configuration = {
539 .name = "configuration",
540 .version_id = 1,
541 .pre_load = configuration_pre_load,
542 .post_load = configuration_post_load,
543 .pre_save = configuration_pre_save,
544 .post_save = configuration_post_save,
545 .fields = (VMStateField[]) {
546 VMSTATE_UINT32(len, SaveState),
547 VMSTATE_VBUFFER_ALLOC_UINT32(name, SaveState, 0, NULL, len),
548 VMSTATE_END_OF_LIST()
549 },
550 .subsections = (const VMStateDescription *[]) {
551 &vmstate_target_page_bits,
552 &vmstate_capabilites,
553 &vmstate_uuid,
554 NULL
555 }
556};
557
558static void dump_vmstate_vmsd(FILE *out_file,
559 const VMStateDescription *vmsd, int indent,
560 bool is_subsection);
561
562static void dump_vmstate_vmsf(FILE *out_file, const VMStateField *field,
563 int indent)
564{
565 fprintf(out_file, "%*s{\n", indent, "");
566 indent += 2;
567 fprintf(out_file, "%*s\"field\": \"%s\",\n", indent, "", field->name);
568 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "",
569 field->version_id);
570 fprintf(out_file, "%*s\"field_exists\": %s,\n", indent, "",
571 field->field_exists ? "true" : "false");
572 fprintf(out_file, "%*s\"size\": %zu", indent, "", field->size);
573 if (field->vmsd != NULL) {
574 fprintf(out_file, ",\n");
575 dump_vmstate_vmsd(out_file, field->vmsd, indent, false);
576 }
577 fprintf(out_file, "\n%*s}", indent - 2, "");
578}
579
580static void dump_vmstate_vmss(FILE *out_file,
581 const VMStateDescription **subsection,
582 int indent)
583{
584 if (*subsection != NULL) {
585 dump_vmstate_vmsd(out_file, *subsection, indent, true);
586 }
587}
588
589static void dump_vmstate_vmsd(FILE *out_file,
590 const VMStateDescription *vmsd, int indent,
591 bool is_subsection)
592{
593 if (is_subsection) {
594 fprintf(out_file, "%*s{\n", indent, "");
595 } else {
596 fprintf(out_file, "%*s\"%s\": {\n", indent, "", "Description");
597 }
598 indent += 2;
599 fprintf(out_file, "%*s\"name\": \"%s\",\n", indent, "", vmsd->name);
600 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "",
601 vmsd->version_id);
602 fprintf(out_file, "%*s\"minimum_version_id\": %d", indent, "",
603 vmsd->minimum_version_id);
604 if (vmsd->fields != NULL) {
605 const VMStateField *field = vmsd->fields;
606 bool first;
607
608 fprintf(out_file, ",\n%*s\"Fields\": [\n", indent, "");
609 first = true;
610 while (field->name != NULL) {
611 if (field->flags & VMS_MUST_EXIST) {
612
613 field++;
614 continue;
615 }
616 if (!first) {
617 fprintf(out_file, ",\n");
618 }
619 dump_vmstate_vmsf(out_file, field, indent + 2);
620 field++;
621 first = false;
622 }
623 fprintf(out_file, "\n%*s]", indent, "");
624 }
625 if (vmsd->subsections != NULL) {
626 const VMStateDescription **subsection = vmsd->subsections;
627 bool first;
628
629 fprintf(out_file, ",\n%*s\"Subsections\": [\n", indent, "");
630 first = true;
631 while (*subsection != NULL) {
632 if (!first) {
633 fprintf(out_file, ",\n");
634 }
635 dump_vmstate_vmss(out_file, subsection, indent + 2);
636 subsection++;
637 first = false;
638 }
639 fprintf(out_file, "\n%*s]", indent, "");
640 }
641 fprintf(out_file, "\n%*s}", indent - 2, "");
642}
643
644static void dump_machine_type(FILE *out_file)
645{
646 MachineClass *mc;
647
648 mc = MACHINE_GET_CLASS(current_machine);
649
650 fprintf(out_file, " \"vmschkmachine\": {\n");
651 fprintf(out_file, " \"Name\": \"%s\"\n", mc->name);
652 fprintf(out_file, " },\n");
653}
654
655void dump_vmstate_json_to_file(FILE *out_file)
656{
657 GSList *list, *elt;
658 bool first;
659
660 fprintf(out_file, "{\n");
661 dump_machine_type(out_file);
662
663 first = true;
664 list = object_class_get_list(TYPE_DEVICE, true);
665 for (elt = list; elt; elt = elt->next) {
666 DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
667 TYPE_DEVICE);
668 const char *name;
669 int indent = 2;
670
671 if (!dc->vmsd) {
672 continue;
673 }
674
675 if (!first) {
676 fprintf(out_file, ",\n");
677 }
678 name = object_class_get_name(OBJECT_CLASS(dc));
679 fprintf(out_file, "%*s\"%s\": {\n", indent, "", name);
680 indent += 2;
681 fprintf(out_file, "%*s\"Name\": \"%s\",\n", indent, "", name);
682 fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "",
683 dc->vmsd->version_id);
684 fprintf(out_file, "%*s\"minimum_version_id\": %d,\n", indent, "",
685 dc->vmsd->minimum_version_id);
686
687 dump_vmstate_vmsd(out_file, dc->vmsd, indent, false);
688
689 fprintf(out_file, "\n%*s}", indent - 2, "");
690 first = false;
691 }
692 fprintf(out_file, "\n}\n");
693 fclose(out_file);
694 g_slist_free(list);
695}
696
697static uint32_t calculate_new_instance_id(const char *idstr)
698{
699 SaveStateEntry *se;
700 uint32_t instance_id = 0;
701
702 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
703 if (strcmp(idstr, se->idstr) == 0
704 && instance_id <= se->instance_id) {
705 instance_id = se->instance_id + 1;
706 }
707 }
708
709 assert(instance_id != VMSTATE_INSTANCE_ID_ANY);
710 return instance_id;
711}
712
713static int calculate_compat_instance_id(const char *idstr)
714{
715 SaveStateEntry *se;
716 int instance_id = 0;
717
718 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
719 if (!se->compat) {
720 continue;
721 }
722
723 if (strcmp(idstr, se->compat->idstr) == 0
724 && instance_id <= se->compat->instance_id) {
725 instance_id = se->compat->instance_id + 1;
726 }
727 }
728 return instance_id;
729}
730
731static inline MigrationPriority save_state_priority(SaveStateEntry *se)
732{
733 if (se->vmsd) {
734 return se->vmsd->priority;
735 }
736 return MIG_PRI_DEFAULT;
737}
738
739static void savevm_state_handler_insert(SaveStateEntry *nse)
740{
741 MigrationPriority priority = save_state_priority(nse);
742 SaveStateEntry *se;
743 int i;
744
745 assert(priority <= MIG_PRI_MAX);
746
747 for (i = priority - 1; i >= 0; i--) {
748 se = savevm_state.handler_pri_head[i];
749 if (se != NULL) {
750 assert(save_state_priority(se) < priority);
751 break;
752 }
753 }
754
755 if (i >= 0) {
756 QTAILQ_INSERT_BEFORE(se, nse, entry);
757 } else {
758 QTAILQ_INSERT_TAIL(&savevm_state.handlers, nse, entry);
759 }
760
761 if (savevm_state.handler_pri_head[priority] == NULL) {
762 savevm_state.handler_pri_head[priority] = nse;
763 }
764}
765
766static void savevm_state_handler_remove(SaveStateEntry *se)
767{
768 SaveStateEntry *next;
769 MigrationPriority priority = save_state_priority(se);
770
771 if (se == savevm_state.handler_pri_head[priority]) {
772 next = QTAILQ_NEXT(se, entry);
773 if (next != NULL && save_state_priority(next) == priority) {
774 savevm_state.handler_pri_head[priority] = next;
775 } else {
776 savevm_state.handler_pri_head[priority] = NULL;
777 }
778 }
779 QTAILQ_REMOVE(&savevm_state.handlers, se, entry);
780}
781
782
783
784
785
786int register_savevm_live(const char *idstr,
787 uint32_t instance_id,
788 int version_id,
789 const SaveVMHandlers *ops,
790 void *opaque)
791{
792 SaveStateEntry *se;
793
794 se = g_new0(SaveStateEntry, 1);
795 se->version_id = version_id;
796 se->section_id = savevm_state.global_section_id++;
797 se->ops = ops;
798 se->opaque = opaque;
799 se->vmsd = NULL;
800
801 if (ops->save_setup != NULL) {
802 se->is_ram = 1;
803 }
804
805 pstrcat(se->idstr, sizeof(se->idstr), idstr);
806
807 if (instance_id == VMSTATE_INSTANCE_ID_ANY) {
808 se->instance_id = calculate_new_instance_id(se->idstr);
809 } else {
810 se->instance_id = instance_id;
811 }
812 assert(!se->compat || se->instance_id == 0);
813 savevm_state_handler_insert(se);
814 return 0;
815}
816
817void unregister_savevm(VMStateIf *obj, const char *idstr, void *opaque)
818{
819 SaveStateEntry *se, *new_se;
820 char id[256] = "";
821
822 if (obj) {
823 char *oid = vmstate_if_get_id(obj);
824 if (oid) {
825 pstrcpy(id, sizeof(id), oid);
826 pstrcat(id, sizeof(id), "/");
827 g_free(oid);
828 }
829 }
830 pstrcat(id, sizeof(id), idstr);
831
832 QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) {
833 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
834 savevm_state_handler_remove(se);
835 g_free(se->compat);
836 g_free(se);
837 }
838 }
839}
840
841int vmstate_register_with_alias_id(VMStateIf *obj, uint32_t instance_id,
842 const VMStateDescription *vmsd,
843 void *opaque, int alias_id,
844 int required_for_version,
845 Error **errp)
846{
847 SaveStateEntry *se;
848
849
850 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
851
852 se = g_new0(SaveStateEntry, 1);
853 se->version_id = vmsd->version_id;
854 se->section_id = savevm_state.global_section_id++;
855 se->opaque = opaque;
856 se->vmsd = vmsd;
857 se->alias_id = alias_id;
858
859 if (obj) {
860 char *id = vmstate_if_get_id(obj);
861 if (id) {
862 if (snprintf(se->idstr, sizeof(se->idstr), "%s/", id) >=
863 sizeof(se->idstr)) {
864 error_setg(errp, "Path too long for VMState (%s)", id);
865 g_free(id);
866 g_free(se);
867
868 return -1;
869 }
870 g_free(id);
871
872 se->compat = g_new0(CompatEntry, 1);
873 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
874 se->compat->instance_id = instance_id == VMSTATE_INSTANCE_ID_ANY ?
875 calculate_compat_instance_id(vmsd->name) : instance_id;
876 instance_id = VMSTATE_INSTANCE_ID_ANY;
877 }
878 }
879 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
880
881 if (instance_id == VMSTATE_INSTANCE_ID_ANY) {
882 se->instance_id = calculate_new_instance_id(se->idstr);
883 } else {
884 se->instance_id = instance_id;
885 }
886 assert(!se->compat || se->instance_id == 0);
887 savevm_state_handler_insert(se);
888 return 0;
889}
890
891void vmstate_unregister(VMStateIf *obj, const VMStateDescription *vmsd,
892 void *opaque)
893{
894 SaveStateEntry *se, *new_se;
895
896 QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) {
897 if (se->vmsd == vmsd && se->opaque == opaque) {
898 savevm_state_handler_remove(se);
899 g_free(se->compat);
900 g_free(se);
901 }
902 }
903}
904
905static int vmstate_load(QEMUFile *f, SaveStateEntry *se)
906{
907 trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
908 if (!se->vmsd) {
909 return se->ops->load_state(f, se->opaque, se->load_version_id);
910 }
911 return vmstate_load_state(f, se->vmsd, se->opaque, se->load_version_id);
912}
913
914static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se,
915 JSONWriter *vmdesc)
916{
917 int64_t old_offset, size;
918
919 old_offset = qemu_ftell_fast(f);
920 se->ops->save_state(f, se->opaque);
921 size = qemu_ftell_fast(f) - old_offset;
922
923 if (vmdesc) {
924 json_writer_int64(vmdesc, "size", size);
925 json_writer_start_array(vmdesc, "fields");
926 json_writer_start_object(vmdesc, NULL);
927 json_writer_str(vmdesc, "name", "data");
928 json_writer_int64(vmdesc, "size", size);
929 json_writer_str(vmdesc, "type", "buffer");
930 json_writer_end_object(vmdesc);
931 json_writer_end_array(vmdesc);
932 }
933}
934
935static int vmstate_save(QEMUFile *f, SaveStateEntry *se,
936 JSONWriter *vmdesc)
937{
938 trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
939 if (!se->vmsd) {
940 vmstate_save_old_style(f, se, vmdesc);
941 return 0;
942 }
943 return vmstate_save_state(f, se->vmsd, se->opaque, vmdesc);
944}
945
946
947
948
949static void save_section_header(QEMUFile *f, SaveStateEntry *se,
950 uint8_t section_type)
951{
952 qemu_put_byte(f, section_type);
953 qemu_put_be32(f, se->section_id);
954
955 if (section_type == QEMU_VM_SECTION_FULL ||
956 section_type == QEMU_VM_SECTION_START) {
957
958 size_t len = strlen(se->idstr);
959 qemu_put_byte(f, len);
960 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
961
962 qemu_put_be32(f, se->instance_id);
963 qemu_put_be32(f, se->version_id);
964 }
965}
966
967
968
969
970
971static void save_section_footer(QEMUFile *f, SaveStateEntry *se)
972{
973 if (migrate_get_current()->send_section_footer) {
974 qemu_put_byte(f, QEMU_VM_SECTION_FOOTER);
975 qemu_put_be32(f, se->section_id);
976 }
977}
978
979
980
981
982
983
984
985
986
987
988static void qemu_savevm_command_send(QEMUFile *f,
989 enum qemu_vm_cmd command,
990 uint16_t len,
991 uint8_t *data)
992{
993 trace_savevm_command_send(command, len);
994 qemu_put_byte(f, QEMU_VM_COMMAND);
995 qemu_put_be16(f, (uint16_t)command);
996 qemu_put_be16(f, len);
997 qemu_put_buffer(f, data, len);
998 qemu_fflush(f);
999}
1000
1001void qemu_savevm_send_colo_enable(QEMUFile *f)
1002{
1003 trace_savevm_send_colo_enable();
1004 qemu_savevm_command_send(f, MIG_CMD_ENABLE_COLO, 0, NULL);
1005}
1006
1007void qemu_savevm_send_ping(QEMUFile *f, uint32_t value)
1008{
1009 uint32_t buf;
1010
1011 trace_savevm_send_ping(value);
1012 buf = cpu_to_be32(value);
1013 qemu_savevm_command_send(f, MIG_CMD_PING, sizeof(value), (uint8_t *)&buf);
1014}
1015
1016void qemu_savevm_send_open_return_path(QEMUFile *f)
1017{
1018 trace_savevm_send_open_return_path();
1019 qemu_savevm_command_send(f, MIG_CMD_OPEN_RETURN_PATH, 0, NULL);
1020}
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031int qemu_savevm_send_packaged(QEMUFile *f, const uint8_t *buf, size_t len)
1032{
1033 uint32_t tmp;
1034
1035 if (len > MAX_VM_CMD_PACKAGED_SIZE) {
1036 error_report("%s: Unreasonably large packaged state: %zu",
1037 __func__, len);
1038 return -1;
1039 }
1040
1041 tmp = cpu_to_be32(len);
1042
1043 trace_qemu_savevm_send_packaged();
1044 qemu_savevm_command_send(f, MIG_CMD_PACKAGED, 4, (uint8_t *)&tmp);
1045
1046 qemu_put_buffer(f, buf, len);
1047
1048 return 0;
1049}
1050
1051
1052void qemu_savevm_send_postcopy_advise(QEMUFile *f)
1053{
1054 if (migrate_postcopy_ram()) {
1055 uint64_t tmp[2];
1056 tmp[0] = cpu_to_be64(ram_pagesize_summary());
1057 tmp[1] = cpu_to_be64(qemu_target_page_size());
1058
1059 trace_qemu_savevm_send_postcopy_advise();
1060 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_ADVISE,
1061 16, (uint8_t *)tmp);
1062 } else {
1063 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_ADVISE, 0, NULL);
1064 }
1065}
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name,
1085 uint16_t len,
1086 uint64_t *start_list,
1087 uint64_t *length_list)
1088{
1089 uint8_t *buf;
1090 uint16_t tmplen;
1091 uint16_t t;
1092 size_t name_len = strlen(name);
1093
1094 trace_qemu_savevm_send_postcopy_ram_discard(name, len);
1095 assert(name_len < 256);
1096 buf = g_malloc0(1 + 1 + name_len + 1 + (8 + 8) * len);
1097 buf[0] = postcopy_ram_discard_version;
1098 buf[1] = name_len;
1099 memcpy(buf + 2, name, name_len);
1100 tmplen = 2 + name_len;
1101 buf[tmplen++] = '\0';
1102
1103 for (t = 0; t < len; t++) {
1104 stq_be_p(buf + tmplen, start_list[t]);
1105 tmplen += 8;
1106 stq_be_p(buf + tmplen, length_list[t]);
1107 tmplen += 8;
1108 }
1109 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RAM_DISCARD, tmplen, buf);
1110 g_free(buf);
1111}
1112
1113
1114void qemu_savevm_send_postcopy_listen(QEMUFile *f)
1115{
1116 trace_savevm_send_postcopy_listen();
1117 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_LISTEN, 0, NULL);
1118}
1119
1120
1121void qemu_savevm_send_postcopy_run(QEMUFile *f)
1122{
1123 trace_savevm_send_postcopy_run();
1124 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RUN, 0, NULL);
1125}
1126
1127void qemu_savevm_send_postcopy_resume(QEMUFile *f)
1128{
1129 trace_savevm_send_postcopy_resume();
1130 qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RESUME, 0, NULL);
1131}
1132
1133void qemu_savevm_send_recv_bitmap(QEMUFile *f, char *block_name)
1134{
1135 size_t len;
1136 char buf[256];
1137
1138 trace_savevm_send_recv_bitmap(block_name);
1139
1140 buf[0] = len = strlen(block_name);
1141 memcpy(buf + 1, block_name, len);
1142
1143 qemu_savevm_command_send(f, MIG_CMD_RECV_BITMAP, len + 1, (uint8_t *)buf);
1144}
1145
1146bool qemu_savevm_state_blocked(Error **errp)
1147{
1148 SaveStateEntry *se;
1149
1150 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1151 if (se->vmsd && se->vmsd->unmigratable) {
1152 error_setg(errp, "State blocked by non-migratable device '%s'",
1153 se->idstr);
1154 return true;
1155 }
1156 }
1157 return false;
1158}
1159
1160void qemu_savevm_non_migratable_list(strList **reasons)
1161{
1162 SaveStateEntry *se;
1163
1164 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1165 if (se->vmsd && se->vmsd->unmigratable) {
1166 QAPI_LIST_PREPEND(*reasons,
1167 g_strdup_printf("non-migratable device: %s",
1168 se->idstr));
1169 }
1170 }
1171}
1172
1173void qemu_savevm_state_header(QEMUFile *f)
1174{
1175 trace_savevm_state_header();
1176 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1177 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1178
1179 if (migrate_get_current()->send_configuration) {
1180 qemu_put_byte(f, QEMU_VM_CONFIGURATION);
1181 vmstate_save_state(f, &vmstate_configuration, &savevm_state, 0);
1182 }
1183}
1184
1185bool qemu_savevm_state_guest_unplug_pending(void)
1186{
1187 SaveStateEntry *se;
1188
1189 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1190 if (se->vmsd && se->vmsd->dev_unplug_pending &&
1191 se->vmsd->dev_unplug_pending(se->opaque)) {
1192 return true;
1193 }
1194 }
1195
1196 return false;
1197}
1198
1199void qemu_savevm_state_setup(QEMUFile *f)
1200{
1201 SaveStateEntry *se;
1202 Error *local_err = NULL;
1203 int ret;
1204
1205 trace_savevm_state_setup();
1206 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1207 if (!se->ops || !se->ops->save_setup) {
1208 continue;
1209 }
1210 if (se->ops->is_active) {
1211 if (!se->ops->is_active(se->opaque)) {
1212 continue;
1213 }
1214 }
1215 save_section_header(f, se, QEMU_VM_SECTION_START);
1216
1217 ret = se->ops->save_setup(f, se->opaque);
1218 save_section_footer(f, se);
1219 if (ret < 0) {
1220 qemu_file_set_error(f, ret);
1221 break;
1222 }
1223 }
1224
1225 if (precopy_notify(PRECOPY_NOTIFY_SETUP, &local_err)) {
1226 error_report_err(local_err);
1227 }
1228}
1229
1230int qemu_savevm_state_resume_prepare(MigrationState *s)
1231{
1232 SaveStateEntry *se;
1233 int ret;
1234
1235 trace_savevm_state_resume_prepare();
1236
1237 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1238 if (!se->ops || !se->ops->resume_prepare) {
1239 continue;
1240 }
1241 if (se->ops->is_active) {
1242 if (!se->ops->is_active(se->opaque)) {
1243 continue;
1244 }
1245 }
1246 ret = se->ops->resume_prepare(s, se->opaque);
1247 if (ret < 0) {
1248 return ret;
1249 }
1250 }
1251
1252 return 0;
1253}
1254
1255
1256
1257
1258
1259
1260
1261int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy)
1262{
1263 SaveStateEntry *se;
1264 int ret = 1;
1265
1266 trace_savevm_state_iterate();
1267 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1268 if (!se->ops || !se->ops->save_live_iterate) {
1269 continue;
1270 }
1271 if (se->ops->is_active &&
1272 !se->ops->is_active(se->opaque)) {
1273 continue;
1274 }
1275 if (se->ops->is_active_iterate &&
1276 !se->ops->is_active_iterate(se->opaque)) {
1277 continue;
1278 }
1279
1280
1281
1282
1283
1284
1285 if (postcopy &&
1286 !(se->ops->has_postcopy && se->ops->has_postcopy(se->opaque))) {
1287 continue;
1288 }
1289 if (qemu_file_rate_limit(f)) {
1290 return 0;
1291 }
1292 trace_savevm_section_start(se->idstr, se->section_id);
1293
1294 save_section_header(f, se, QEMU_VM_SECTION_PART);
1295
1296 ret = se->ops->save_live_iterate(f, se->opaque);
1297 trace_savevm_section_end(se->idstr, se->section_id, ret);
1298 save_section_footer(f, se);
1299
1300 if (ret < 0) {
1301 error_report("failed to save SaveStateEntry with id(name): %d(%s)",
1302 se->section_id, se->idstr);
1303 qemu_file_set_error(f, ret);
1304 }
1305 if (ret <= 0) {
1306
1307
1308
1309
1310 break;
1311 }
1312 }
1313 return ret;
1314}
1315
1316static bool should_send_vmdesc(void)
1317{
1318 MachineState *machine = MACHINE(qdev_get_machine());
1319 bool in_postcopy = migration_in_postcopy();
1320 return !machine->suppress_vmdesc && !in_postcopy;
1321}
1322
1323
1324
1325
1326
1327
1328
1329
1330void qemu_savevm_state_complete_postcopy(QEMUFile *f)
1331{
1332 SaveStateEntry *se;
1333 int ret;
1334
1335 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1336 if (!se->ops || !se->ops->save_live_complete_postcopy) {
1337 continue;
1338 }
1339 if (se->ops->is_active) {
1340 if (!se->ops->is_active(se->opaque)) {
1341 continue;
1342 }
1343 }
1344 trace_savevm_section_start(se->idstr, se->section_id);
1345
1346 qemu_put_byte(f, QEMU_VM_SECTION_END);
1347 qemu_put_be32(f, se->section_id);
1348
1349 ret = se->ops->save_live_complete_postcopy(f, se->opaque);
1350 trace_savevm_section_end(se->idstr, se->section_id, ret);
1351 save_section_footer(f, se);
1352 if (ret < 0) {
1353 qemu_file_set_error(f, ret);
1354 return;
1355 }
1356 }
1357
1358 qemu_put_byte(f, QEMU_VM_EOF);
1359 qemu_fflush(f);
1360}
1361
1362static
1363int qemu_savevm_state_complete_precopy_iterable(QEMUFile *f, bool in_postcopy)
1364{
1365 SaveStateEntry *se;
1366 int ret;
1367
1368 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1369 if (!se->ops ||
1370 (in_postcopy && se->ops->has_postcopy &&
1371 se->ops->has_postcopy(se->opaque)) ||
1372 !se->ops->save_live_complete_precopy) {
1373 continue;
1374 }
1375
1376 if (se->ops->is_active) {
1377 if (!se->ops->is_active(se->opaque)) {
1378 continue;
1379 }
1380 }
1381 trace_savevm_section_start(se->idstr, se->section_id);
1382
1383 save_section_header(f, se, QEMU_VM_SECTION_END);
1384
1385 ret = se->ops->save_live_complete_precopy(f, se->opaque);
1386 trace_savevm_section_end(se->idstr, se->section_id, ret);
1387 save_section_footer(f, se);
1388 if (ret < 0) {
1389 qemu_file_set_error(f, ret);
1390 return -1;
1391 }
1392 }
1393
1394 return 0;
1395}
1396
1397int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f,
1398 bool in_postcopy,
1399 bool inactivate_disks)
1400{
1401 g_autoptr(JSONWriter) vmdesc = NULL;
1402 int vmdesc_len;
1403 SaveStateEntry *se;
1404 int ret;
1405
1406 vmdesc = json_writer_new(false);
1407 json_writer_start_object(vmdesc, NULL);
1408 json_writer_int64(vmdesc, "page_size", qemu_target_page_size());
1409 json_writer_start_array(vmdesc, "devices");
1410 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1411
1412 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1413 continue;
1414 }
1415 if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
1416 trace_savevm_section_skip(se->idstr, se->section_id);
1417 continue;
1418 }
1419
1420 trace_savevm_section_start(se->idstr, se->section_id);
1421
1422 json_writer_start_object(vmdesc, NULL);
1423 json_writer_str(vmdesc, "name", se->idstr);
1424 json_writer_int64(vmdesc, "instance_id", se->instance_id);
1425
1426 save_section_header(f, se, QEMU_VM_SECTION_FULL);
1427 ret = vmstate_save(f, se, vmdesc);
1428 if (ret) {
1429 qemu_file_set_error(f, ret);
1430 return ret;
1431 }
1432 trace_savevm_section_end(se->idstr, se->section_id, 0);
1433 save_section_footer(f, se);
1434
1435 json_writer_end_object(vmdesc);
1436 }
1437
1438 if (inactivate_disks) {
1439
1440
1441 ret = bdrv_inactivate_all();
1442 if (ret) {
1443 error_report("%s: bdrv_inactivate_all() failed (%d)",
1444 __func__, ret);
1445 qemu_file_set_error(f, ret);
1446 return ret;
1447 }
1448 }
1449 if (!in_postcopy) {
1450
1451 qemu_put_byte(f, QEMU_VM_EOF);
1452 }
1453
1454 json_writer_end_array(vmdesc);
1455 json_writer_end_object(vmdesc);
1456 vmdesc_len = strlen(json_writer_get(vmdesc));
1457
1458 if (should_send_vmdesc()) {
1459 qemu_put_byte(f, QEMU_VM_VMDESCRIPTION);
1460 qemu_put_be32(f, vmdesc_len);
1461 qemu_put_buffer(f, (uint8_t *)json_writer_get(vmdesc), vmdesc_len);
1462 }
1463
1464 return 0;
1465}
1466
1467int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only,
1468 bool inactivate_disks)
1469{
1470 int ret;
1471 Error *local_err = NULL;
1472 bool in_postcopy = migration_in_postcopy();
1473
1474 if (precopy_notify(PRECOPY_NOTIFY_COMPLETE, &local_err)) {
1475 error_report_err(local_err);
1476 }
1477
1478 trace_savevm_state_complete_precopy();
1479
1480 cpu_synchronize_all_states();
1481
1482 if (!in_postcopy || iterable_only) {
1483 ret = qemu_savevm_state_complete_precopy_iterable(f, in_postcopy);
1484 if (ret) {
1485 return ret;
1486 }
1487 }
1488
1489 if (iterable_only) {
1490 goto flush;
1491 }
1492
1493 ret = qemu_savevm_state_complete_precopy_non_iterable(f, in_postcopy,
1494 inactivate_disks);
1495 if (ret) {
1496 return ret;
1497 }
1498
1499flush:
1500 qemu_fflush(f);
1501 return 0;
1502}
1503
1504
1505
1506
1507
1508void qemu_savevm_state_pending(QEMUFile *f, uint64_t threshold_size,
1509 uint64_t *res_precopy_only,
1510 uint64_t *res_compatible,
1511 uint64_t *res_postcopy_only)
1512{
1513 SaveStateEntry *se;
1514
1515 *res_precopy_only = 0;
1516 *res_compatible = 0;
1517 *res_postcopy_only = 0;
1518
1519
1520 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1521 if (!se->ops || !se->ops->save_live_pending) {
1522 continue;
1523 }
1524 if (se->ops->is_active) {
1525 if (!se->ops->is_active(se->opaque)) {
1526 continue;
1527 }
1528 }
1529 se->ops->save_live_pending(f, se->opaque, threshold_size,
1530 res_precopy_only, res_compatible,
1531 res_postcopy_only);
1532 }
1533}
1534
1535void qemu_savevm_state_cleanup(void)
1536{
1537 SaveStateEntry *se;
1538 Error *local_err = NULL;
1539
1540 if (precopy_notify(PRECOPY_NOTIFY_CLEANUP, &local_err)) {
1541 error_report_err(local_err);
1542 }
1543
1544 trace_savevm_state_cleanup();
1545 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1546 if (se->ops && se->ops->save_cleanup) {
1547 se->ops->save_cleanup(se->opaque);
1548 }
1549 }
1550}
1551
1552static int qemu_savevm_state(QEMUFile *f, Error **errp)
1553{
1554 int ret;
1555 MigrationState *ms = migrate_get_current();
1556 MigrationStatus status;
1557
1558 if (migration_is_running(ms->state)) {
1559 error_setg(errp, QERR_MIGRATION_ACTIVE);
1560 return -EINVAL;
1561 }
1562
1563 if (migrate_use_block()) {
1564 error_setg(errp, "Block migration and snapshots are incompatible");
1565 return -EINVAL;
1566 }
1567
1568 migrate_init(ms);
1569 memset(&ram_counters, 0, sizeof(ram_counters));
1570 memset(&compression_counters, 0, sizeof(compression_counters));
1571 ms->to_dst_file = f;
1572
1573 qemu_mutex_unlock_iothread();
1574 qemu_savevm_state_header(f);
1575 qemu_savevm_state_setup(f);
1576 qemu_mutex_lock_iothread();
1577
1578 while (qemu_file_get_error(f) == 0) {
1579 if (qemu_savevm_state_iterate(f, false) > 0) {
1580 break;
1581 }
1582 }
1583
1584 ret = qemu_file_get_error(f);
1585 if (ret == 0) {
1586 qemu_savevm_state_complete_precopy(f, false, false);
1587 ret = qemu_file_get_error(f);
1588 }
1589 qemu_savevm_state_cleanup();
1590 if (ret != 0) {
1591 error_setg_errno(errp, -ret, "Error while writing VM state");
1592 }
1593
1594 if (ret != 0) {
1595 status = MIGRATION_STATUS_FAILED;
1596 } else {
1597 status = MIGRATION_STATUS_COMPLETED;
1598 }
1599 migrate_set_state(&ms->state, MIGRATION_STATUS_SETUP, status);
1600
1601
1602
1603 ms->to_dst_file = NULL;
1604
1605 return ret;
1606}
1607
1608void qemu_savevm_live_state(QEMUFile *f)
1609{
1610
1611 qemu_savevm_state_complete_precopy(f, true, false);
1612 qemu_put_byte(f, QEMU_VM_EOF);
1613}
1614
1615int qemu_save_device_state(QEMUFile *f)
1616{
1617 SaveStateEntry *se;
1618
1619 if (!migration_in_colo_state()) {
1620 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1621 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1622 }
1623 cpu_synchronize_all_states();
1624
1625 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1626 int ret;
1627
1628 if (se->is_ram) {
1629 continue;
1630 }
1631 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1632 continue;
1633 }
1634 if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) {
1635 continue;
1636 }
1637
1638 save_section_header(f, se, QEMU_VM_SECTION_FULL);
1639
1640 ret = vmstate_save(f, se, NULL);
1641 if (ret) {
1642 return ret;
1643 }
1644
1645 save_section_footer(f, se);
1646 }
1647
1648 qemu_put_byte(f, QEMU_VM_EOF);
1649
1650 return qemu_file_get_error(f);
1651}
1652
1653static SaveStateEntry *find_se(const char *idstr, uint32_t instance_id)
1654{
1655 SaveStateEntry *se;
1656
1657 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
1658 if (!strcmp(se->idstr, idstr) &&
1659 (instance_id == se->instance_id ||
1660 instance_id == se->alias_id))
1661 return se;
1662
1663 if (strstr(se->idstr, idstr) && se->compat) {
1664 if (!strcmp(se->compat->idstr, idstr) &&
1665 (instance_id == se->compat->instance_id ||
1666 instance_id == se->alias_id))
1667 return se;
1668 }
1669 }
1670 return NULL;
1671}
1672
1673enum LoadVMExitCodes {
1674
1675 LOADVM_QUIT = 1,
1676};
1677
1678
1679
1680
1681
1682
1683static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis,
1684 uint16_t len)
1685{
1686 PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_ADVISE);
1687 uint64_t remote_pagesize_summary, local_pagesize_summary, remote_tps;
1688 Error *local_err = NULL;
1689
1690 trace_loadvm_postcopy_handle_advise();
1691 if (ps != POSTCOPY_INCOMING_NONE) {
1692 error_report("CMD_POSTCOPY_ADVISE in wrong postcopy state (%d)", ps);
1693 return -1;
1694 }
1695
1696 switch (len) {
1697 case 0:
1698 if (migrate_postcopy_ram()) {
1699 error_report("RAM postcopy is enabled but have 0 byte advise");
1700 return -EINVAL;
1701 }
1702 return 0;
1703 case 8 + 8:
1704 if (!migrate_postcopy_ram()) {
1705 error_report("RAM postcopy is disabled but have 16 byte advise");
1706 return -EINVAL;
1707 }
1708 break;
1709 default:
1710 error_report("CMD_POSTCOPY_ADVISE invalid length (%d)", len);
1711 return -EINVAL;
1712 }
1713
1714 if (!postcopy_ram_supported_by_host(mis)) {
1715 postcopy_state_set(POSTCOPY_INCOMING_NONE);
1716 return -1;
1717 }
1718
1719 remote_pagesize_summary = qemu_get_be64(mis->from_src_file);
1720 local_pagesize_summary = ram_pagesize_summary();
1721
1722 if (remote_pagesize_summary != local_pagesize_summary) {
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737 error_report("Postcopy needs matching RAM page sizes (s=%" PRIx64
1738 " d=%" PRIx64 ")",
1739 remote_pagesize_summary, local_pagesize_summary);
1740 return -1;
1741 }
1742
1743 remote_tps = qemu_get_be64(mis->from_src_file);
1744 if (remote_tps != qemu_target_page_size()) {
1745
1746
1747
1748
1749 error_report("Postcopy needs matching target page sizes (s=%d d=%zd)",
1750 (int)remote_tps, qemu_target_page_size());
1751 return -1;
1752 }
1753
1754 if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_ADVISE, &local_err)) {
1755 error_report_err(local_err);
1756 return -1;
1757 }
1758
1759 if (ram_postcopy_incoming_init(mis)) {
1760 return -1;
1761 }
1762
1763 return 0;
1764}
1765
1766
1767
1768
1769
1770
1771static int loadvm_postcopy_ram_handle_discard(MigrationIncomingState *mis,
1772 uint16_t len)
1773{
1774 int tmp;
1775 char ramid[256];
1776 PostcopyState ps = postcopy_state_get();
1777
1778 trace_loadvm_postcopy_ram_handle_discard();
1779
1780 switch (ps) {
1781 case POSTCOPY_INCOMING_ADVISE:
1782
1783 tmp = postcopy_ram_prepare_discard(mis);
1784 if (tmp) {
1785 return tmp;
1786 }
1787 break;
1788
1789 case POSTCOPY_INCOMING_DISCARD:
1790
1791 break;
1792
1793 default:
1794 error_report("CMD_POSTCOPY_RAM_DISCARD in wrong postcopy state (%d)",
1795 ps);
1796 return -1;
1797 }
1798
1799
1800
1801
1802
1803 if (len < (1 + 1 + 1 + 1 + 2 * 8)) {
1804 error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len);
1805 return -1;
1806 }
1807
1808 tmp = qemu_get_byte(mis->from_src_file);
1809 if (tmp != postcopy_ram_discard_version) {
1810 error_report("CMD_POSTCOPY_RAM_DISCARD invalid version (%d)", tmp);
1811 return -1;
1812 }
1813
1814 if (!qemu_get_counted_string(mis->from_src_file, ramid)) {
1815 error_report("CMD_POSTCOPY_RAM_DISCARD Failed to read RAMBlock ID");
1816 return -1;
1817 }
1818 tmp = qemu_get_byte(mis->from_src_file);
1819 if (tmp != 0) {
1820 error_report("CMD_POSTCOPY_RAM_DISCARD missing nil (%d)", tmp);
1821 return -1;
1822 }
1823
1824 len -= 3 + strlen(ramid);
1825 if (len % 16) {
1826 error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len);
1827 return -1;
1828 }
1829 trace_loadvm_postcopy_ram_handle_discard_header(ramid, len);
1830 while (len) {
1831 uint64_t start_addr, block_length;
1832 start_addr = qemu_get_be64(mis->from_src_file);
1833 block_length = qemu_get_be64(mis->from_src_file);
1834
1835 len -= 16;
1836 int ret = ram_discard_range(ramid, start_addr, block_length);
1837 if (ret) {
1838 return ret;
1839 }
1840 }
1841 trace_loadvm_postcopy_ram_handle_discard_end();
1842
1843 return 0;
1844}
1845
1846
1847
1848
1849
1850
1851
1852
1853static void *postcopy_ram_listen_thread(void *opaque)
1854{
1855 MigrationIncomingState *mis = migration_incoming_get_current();
1856 QEMUFile *f = mis->from_src_file;
1857 int load_res;
1858 MigrationState *migr = migrate_get_current();
1859
1860 object_ref(OBJECT(migr));
1861
1862 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
1863 MIGRATION_STATUS_POSTCOPY_ACTIVE);
1864 qemu_sem_post(&mis->listen_thread_sem);
1865 trace_postcopy_ram_listen_thread_start();
1866
1867 rcu_register_thread();
1868
1869
1870
1871
1872 qemu_file_set_blocking(f, true);
1873 load_res = qemu_loadvm_state_main(f, mis);
1874
1875
1876
1877
1878
1879
1880 f = mis->from_src_file;
1881
1882
1883 qemu_file_set_blocking(f, false);
1884
1885 trace_postcopy_ram_listen_thread_exit();
1886 if (load_res < 0) {
1887 qemu_file_set_error(f, load_res);
1888 dirty_bitmap_mig_cancel_incoming();
1889 if (postcopy_state_get() == POSTCOPY_INCOMING_RUNNING &&
1890 !migrate_postcopy_ram() && migrate_dirty_bitmaps())
1891 {
1892 error_report("%s: loadvm failed during postcopy: %d. All states "
1893 "are migrated except dirty bitmaps. Some dirty "
1894 "bitmaps may be lost, and present migrated dirty "
1895 "bitmaps are correctly migrated and valid.",
1896 __func__, load_res);
1897 load_res = 0;
1898 } else {
1899 error_report("%s: loadvm failed: %d", __func__, load_res);
1900 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
1901 MIGRATION_STATUS_FAILED);
1902 }
1903 }
1904 if (load_res >= 0) {
1905
1906
1907
1908
1909
1910 qemu_event_wait(&mis->main_thread_load_event);
1911 }
1912 postcopy_ram_incoming_cleanup(mis);
1913
1914 if (load_res < 0) {
1915
1916
1917
1918
1919
1920
1921 rcu_unregister_thread();
1922 exit(EXIT_FAILURE);
1923 }
1924
1925 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
1926 MIGRATION_STATUS_COMPLETED);
1927
1928
1929
1930
1931
1932
1933 migration_incoming_state_destroy();
1934 qemu_loadvm_state_cleanup();
1935
1936 rcu_unregister_thread();
1937 mis->have_listen_thread = false;
1938 postcopy_state_set(POSTCOPY_INCOMING_END);
1939
1940 object_unref(OBJECT(migr));
1941
1942 return NULL;
1943}
1944
1945
1946static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis)
1947{
1948 PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_LISTENING);
1949 trace_loadvm_postcopy_handle_listen();
1950 Error *local_err = NULL;
1951
1952 if (ps != POSTCOPY_INCOMING_ADVISE && ps != POSTCOPY_INCOMING_DISCARD) {
1953 error_report("CMD_POSTCOPY_LISTEN in wrong postcopy state (%d)", ps);
1954 return -1;
1955 }
1956 if (ps == POSTCOPY_INCOMING_ADVISE) {
1957
1958
1959
1960
1961 if (migrate_postcopy_ram()) {
1962 postcopy_ram_prepare_discard(mis);
1963 }
1964 }
1965
1966
1967
1968
1969
1970
1971 if (migrate_postcopy_ram()) {
1972 if (postcopy_ram_incoming_setup(mis)) {
1973 postcopy_ram_incoming_cleanup(mis);
1974 return -1;
1975 }
1976 }
1977
1978 if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_LISTEN, &local_err)) {
1979 error_report_err(local_err);
1980 return -1;
1981 }
1982
1983 mis->have_listen_thread = true;
1984
1985 qemu_sem_init(&mis->listen_thread_sem, 0);
1986 qemu_thread_create(&mis->listen_thread, "postcopy/listen",
1987 postcopy_ram_listen_thread, NULL,
1988 QEMU_THREAD_DETACHED);
1989 qemu_sem_wait(&mis->listen_thread_sem);
1990 qemu_sem_destroy(&mis->listen_thread_sem);
1991
1992 return 0;
1993}
1994
1995static void loadvm_postcopy_handle_run_bh(void *opaque)
1996{
1997 Error *local_err = NULL;
1998 MigrationIncomingState *mis = opaque;
1999
2000
2001
2002
2003 cpu_synchronize_all_post_init();
2004
2005 qemu_announce_self(&mis->announce_timer, migrate_announce_params());
2006
2007
2008
2009 bdrv_invalidate_cache_all(&local_err);
2010 if (local_err) {
2011 error_report_err(local_err);
2012 local_err = NULL;
2013 autostart = false;
2014 }
2015
2016 trace_loadvm_postcopy_handle_run_cpu_sync();
2017
2018 trace_loadvm_postcopy_handle_run_vmstart();
2019
2020 dirty_bitmap_mig_before_vm_start();
2021
2022 if (autostart) {
2023
2024 vm_start();
2025 } else {
2026
2027 runstate_set(RUN_STATE_PAUSED);
2028 }
2029
2030 qemu_bh_delete(mis->bh);
2031}
2032
2033
2034static int loadvm_postcopy_handle_run(MigrationIncomingState *mis)
2035{
2036 PostcopyState ps = postcopy_state_get();
2037
2038 trace_loadvm_postcopy_handle_run();
2039 if (ps != POSTCOPY_INCOMING_LISTENING) {
2040 error_report("CMD_POSTCOPY_RUN in wrong postcopy state (%d)", ps);
2041 return -1;
2042 }
2043
2044 postcopy_state_set(POSTCOPY_INCOMING_RUNNING);
2045 mis->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, mis);
2046 qemu_bh_schedule(mis->bh);
2047
2048
2049
2050
2051
2052
2053 return LOADVM_QUIT;
2054}
2055
2056
2057static gboolean postcopy_sync_page_req(gpointer key, gpointer value,
2058 gpointer data)
2059{
2060 MigrationIncomingState *mis = data;
2061 void *host_addr = (void *) key;
2062 ram_addr_t rb_offset;
2063 RAMBlock *rb;
2064 int ret;
2065
2066 rb = qemu_ram_block_from_host(host_addr, true, &rb_offset);
2067 if (!rb) {
2068
2069
2070
2071
2072
2073
2074 error_report("%s: illegal host addr %p", __func__, host_addr);
2075
2076 return FALSE;
2077 }
2078
2079 ret = migrate_send_rp_message_req_pages(mis, rb, rb_offset);
2080 if (ret) {
2081
2082 error_report("%s: send rp message failed for addr %p",
2083 __func__, host_addr);
2084 return FALSE;
2085 }
2086
2087 trace_postcopy_page_req_sync(host_addr);
2088
2089 return FALSE;
2090}
2091
2092static void migrate_send_rp_req_pages_pending(MigrationIncomingState *mis)
2093{
2094 WITH_QEMU_LOCK_GUARD(&mis->page_request_mutex) {
2095 g_tree_foreach(mis->page_requested, postcopy_sync_page_req, mis);
2096 }
2097}
2098
2099static int loadvm_postcopy_handle_resume(MigrationIncomingState *mis)
2100{
2101 if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) {
2102 error_report("%s: illegal resume received", __func__);
2103
2104 return 0;
2105 }
2106
2107
2108
2109
2110
2111 mis->last_rb = NULL;
2112
2113
2114
2115
2116 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_RECOVER,
2117 MIGRATION_STATUS_POSTCOPY_ACTIVE);
2118
2119 trace_loadvm_postcopy_handle_resume();
2120
2121
2122 migrate_send_rp_resume_ack(mis, MIGRATION_RESUME_ACK_VALUE);
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136 migrate_send_rp_req_pages_pending(mis);
2137
2138
2139
2140
2141
2142
2143
2144 qemu_sem_post(&mis->postcopy_pause_sem_fault);
2145
2146 return 0;
2147}
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159static int loadvm_handle_cmd_packaged(MigrationIncomingState *mis)
2160{
2161 int ret;
2162 size_t length;
2163 QIOChannelBuffer *bioc;
2164
2165 length = qemu_get_be32(mis->from_src_file);
2166 trace_loadvm_handle_cmd_packaged(length);
2167
2168 if (length > MAX_VM_CMD_PACKAGED_SIZE) {
2169 error_report("Unreasonably large packaged state: %zu", length);
2170 return -1;
2171 }
2172
2173 bioc = qio_channel_buffer_new(length);
2174 qio_channel_set_name(QIO_CHANNEL(bioc), "migration-loadvm-buffer");
2175 ret = qemu_get_buffer(mis->from_src_file,
2176 bioc->data,
2177 length);
2178 if (ret != length) {
2179 object_unref(OBJECT(bioc));
2180 error_report("CMD_PACKAGED: Buffer receive fail ret=%d length=%zu",
2181 ret, length);
2182 return (ret < 0) ? ret : -EAGAIN;
2183 }
2184 bioc->usage += length;
2185 trace_loadvm_handle_cmd_packaged_received(ret);
2186
2187 QEMUFile *packf = qemu_fopen_channel_input(QIO_CHANNEL(bioc));
2188
2189 ret = qemu_loadvm_state_main(packf, mis);
2190 trace_loadvm_handle_cmd_packaged_main(ret);
2191 qemu_fclose(packf);
2192 object_unref(OBJECT(bioc));
2193
2194 return ret;
2195}
2196
2197
2198
2199
2200
2201
2202
2203static int loadvm_handle_recv_bitmap(MigrationIncomingState *mis,
2204 uint16_t len)
2205{
2206 QEMUFile *file = mis->from_src_file;
2207 RAMBlock *rb;
2208 char block_name[256];
2209 size_t cnt;
2210
2211 cnt = qemu_get_counted_string(file, block_name);
2212 if (!cnt) {
2213 error_report("%s: failed to read block name", __func__);
2214 return -EINVAL;
2215 }
2216
2217
2218 if (qemu_file_get_error(file)) {
2219 return qemu_file_get_error(file);
2220 }
2221
2222 if (len != cnt + 1) {
2223 error_report("%s: invalid payload length (%d)", __func__, len);
2224 return -EINVAL;
2225 }
2226
2227 rb = qemu_ram_block_by_name(block_name);
2228 if (!rb) {
2229 error_report("%s: block '%s' not found", __func__, block_name);
2230 return -EINVAL;
2231 }
2232
2233 migrate_send_rp_recv_bitmap(mis, block_name);
2234
2235 trace_loadvm_handle_recv_bitmap(block_name);
2236
2237 return 0;
2238}
2239
2240static int loadvm_process_enable_colo(MigrationIncomingState *mis)
2241{
2242 int ret = migration_incoming_enable_colo();
2243
2244 if (!ret) {
2245 ret = colo_init_ram_cache();
2246 if (ret) {
2247 migration_incoming_disable_colo();
2248 }
2249 }
2250 return ret;
2251}
2252
2253
2254
2255
2256
2257
2258
2259static int loadvm_process_command(QEMUFile *f)
2260{
2261 MigrationIncomingState *mis = migration_incoming_get_current();
2262 uint16_t cmd;
2263 uint16_t len;
2264 uint32_t tmp32;
2265
2266 cmd = qemu_get_be16(f);
2267 len = qemu_get_be16(f);
2268
2269
2270 if (qemu_file_get_error(f)) {
2271 return qemu_file_get_error(f);
2272 }
2273
2274 trace_loadvm_process_command(cmd, len);
2275 if (cmd >= MIG_CMD_MAX || cmd == MIG_CMD_INVALID) {
2276 error_report("MIG_CMD 0x%x unknown (len 0x%x)", cmd, len);
2277 return -EINVAL;
2278 }
2279
2280 if (mig_cmd_args[cmd].len != -1 && mig_cmd_args[cmd].len != len) {
2281 error_report("%s received with bad length - expecting %zu, got %d",
2282 mig_cmd_args[cmd].name,
2283 (size_t)mig_cmd_args[cmd].len, len);
2284 return -ERANGE;
2285 }
2286
2287 switch (cmd) {
2288 case MIG_CMD_OPEN_RETURN_PATH:
2289 if (mis->to_src_file) {
2290 error_report("CMD_OPEN_RETURN_PATH called when RP already open");
2291
2292 return 0;
2293 }
2294 mis->to_src_file = qemu_file_get_return_path(f);
2295 if (!mis->to_src_file) {
2296 error_report("CMD_OPEN_RETURN_PATH failed");
2297 return -1;
2298 }
2299 break;
2300
2301 case MIG_CMD_PING:
2302 tmp32 = qemu_get_be32(f);
2303 trace_loadvm_process_command_ping(tmp32);
2304 if (!mis->to_src_file) {
2305 error_report("CMD_PING (0x%x) received with no return path",
2306 tmp32);
2307 return -1;
2308 }
2309 migrate_send_rp_pong(mis, tmp32);
2310 break;
2311
2312 case MIG_CMD_PACKAGED:
2313 return loadvm_handle_cmd_packaged(mis);
2314
2315 case MIG_CMD_POSTCOPY_ADVISE:
2316 return loadvm_postcopy_handle_advise(mis, len);
2317
2318 case MIG_CMD_POSTCOPY_LISTEN:
2319 return loadvm_postcopy_handle_listen(mis);
2320
2321 case MIG_CMD_POSTCOPY_RUN:
2322 return loadvm_postcopy_handle_run(mis);
2323
2324 case MIG_CMD_POSTCOPY_RAM_DISCARD:
2325 return loadvm_postcopy_ram_handle_discard(mis, len);
2326
2327 case MIG_CMD_POSTCOPY_RESUME:
2328 return loadvm_postcopy_handle_resume(mis);
2329
2330 case MIG_CMD_RECV_BITMAP:
2331 return loadvm_handle_recv_bitmap(mis, len);
2332
2333 case MIG_CMD_ENABLE_COLO:
2334 return loadvm_process_enable_colo(mis);
2335 }
2336
2337 return 0;
2338}
2339
2340
2341
2342
2343
2344
2345
2346static bool check_section_footer(QEMUFile *f, SaveStateEntry *se)
2347{
2348 int ret;
2349 uint8_t read_mark;
2350 uint32_t read_section_id;
2351
2352 if (!migrate_get_current()->send_section_footer) {
2353
2354 return true;
2355 }
2356
2357 read_mark = qemu_get_byte(f);
2358
2359 ret = qemu_file_get_error(f);
2360 if (ret) {
2361 error_report("%s: Read section footer failed: %d",
2362 __func__, ret);
2363 return false;
2364 }
2365
2366 if (read_mark != QEMU_VM_SECTION_FOOTER) {
2367 error_report("Missing section footer for %s", se->idstr);
2368 return false;
2369 }
2370
2371 read_section_id = qemu_get_be32(f);
2372 if (read_section_id != se->load_section_id) {
2373 error_report("Mismatched section id in footer for %s -"
2374 " read 0x%x expected 0x%x",
2375 se->idstr, read_section_id, se->load_section_id);
2376 return false;
2377 }
2378
2379
2380 return true;
2381}
2382
2383static int
2384qemu_loadvm_section_start_full(QEMUFile *f, MigrationIncomingState *mis)
2385{
2386 uint32_t instance_id, version_id, section_id;
2387 SaveStateEntry *se;
2388 char idstr[256];
2389 int ret;
2390
2391
2392 section_id = qemu_get_be32(f);
2393 if (!qemu_get_counted_string(f, idstr)) {
2394 error_report("Unable to read ID string for section %u",
2395 section_id);
2396 return -EINVAL;
2397 }
2398 instance_id = qemu_get_be32(f);
2399 version_id = qemu_get_be32(f);
2400
2401 ret = qemu_file_get_error(f);
2402 if (ret) {
2403 error_report("%s: Failed to read instance/version ID: %d",
2404 __func__, ret);
2405 return ret;
2406 }
2407
2408 trace_qemu_loadvm_state_section_startfull(section_id, idstr,
2409 instance_id, version_id);
2410
2411 se = find_se(idstr, instance_id);
2412 if (se == NULL) {
2413 error_report("Unknown savevm section or instance '%s' %"PRIu32". "
2414 "Make sure that your current VM setup matches your "
2415 "saved VM setup, including any hotplugged devices",
2416 idstr, instance_id);
2417 return -EINVAL;
2418 }
2419
2420
2421 if (version_id > se->version_id) {
2422 error_report("savevm: unsupported version %d for '%s' v%d",
2423 version_id, idstr, se->version_id);
2424 return -EINVAL;
2425 }
2426 se->load_version_id = version_id;
2427 se->load_section_id = section_id;
2428
2429
2430 if (xen_enabled() && se->is_ram) {
2431 error_report("loadvm: %s RAM loading not allowed on Xen", idstr);
2432 return -EINVAL;
2433 }
2434
2435 ret = vmstate_load(f, se);
2436 if (ret < 0) {
2437 error_report("error while loading state for instance 0x%"PRIx32" of"
2438 " device '%s'", instance_id, idstr);
2439 return ret;
2440 }
2441 if (!check_section_footer(f, se)) {
2442 return -EINVAL;
2443 }
2444
2445 return 0;
2446}
2447
2448static int
2449qemu_loadvm_section_part_end(QEMUFile *f, MigrationIncomingState *mis)
2450{
2451 uint32_t section_id;
2452 SaveStateEntry *se;
2453 int ret;
2454
2455 section_id = qemu_get_be32(f);
2456
2457 ret = qemu_file_get_error(f);
2458 if (ret) {
2459 error_report("%s: Failed to read section ID: %d",
2460 __func__, ret);
2461 return ret;
2462 }
2463
2464 trace_qemu_loadvm_state_section_partend(section_id);
2465 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
2466 if (se->load_section_id == section_id) {
2467 break;
2468 }
2469 }
2470 if (se == NULL) {
2471 error_report("Unknown savevm section %d", section_id);
2472 return -EINVAL;
2473 }
2474
2475 ret = vmstate_load(f, se);
2476 if (ret < 0) {
2477 error_report("error while loading state section id %d(%s)",
2478 section_id, se->idstr);
2479 return ret;
2480 }
2481 if (!check_section_footer(f, se)) {
2482 return -EINVAL;
2483 }
2484
2485 return 0;
2486}
2487
2488static int qemu_loadvm_state_header(QEMUFile *f)
2489{
2490 unsigned int v;
2491 int ret;
2492
2493 v = qemu_get_be32(f);
2494 if (v != QEMU_VM_FILE_MAGIC) {
2495 error_report("Not a migration stream");
2496 return -EINVAL;
2497 }
2498
2499 v = qemu_get_be32(f);
2500 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
2501 error_report("SaveVM v2 format is obsolete and don't work anymore");
2502 return -ENOTSUP;
2503 }
2504 if (v != QEMU_VM_FILE_VERSION) {
2505 error_report("Unsupported migration stream version");
2506 return -ENOTSUP;
2507 }
2508
2509 if (migrate_get_current()->send_configuration) {
2510 if (qemu_get_byte(f) != QEMU_VM_CONFIGURATION) {
2511 error_report("Configuration section missing");
2512 qemu_loadvm_state_cleanup();
2513 return -EINVAL;
2514 }
2515 ret = vmstate_load_state(f, &vmstate_configuration, &savevm_state, 0);
2516
2517 if (ret) {
2518 qemu_loadvm_state_cleanup();
2519 return ret;
2520 }
2521 }
2522 return 0;
2523}
2524
2525static int qemu_loadvm_state_setup(QEMUFile *f)
2526{
2527 SaveStateEntry *se;
2528 int ret;
2529
2530 trace_loadvm_state_setup();
2531 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
2532 if (!se->ops || !se->ops->load_setup) {
2533 continue;
2534 }
2535 if (se->ops->is_active) {
2536 if (!se->ops->is_active(se->opaque)) {
2537 continue;
2538 }
2539 }
2540
2541 ret = se->ops->load_setup(f, se->opaque);
2542 if (ret < 0) {
2543 qemu_file_set_error(f, ret);
2544 error_report("Load state of device %s failed", se->idstr);
2545 return ret;
2546 }
2547 }
2548 return 0;
2549}
2550
2551void qemu_loadvm_state_cleanup(void)
2552{
2553 SaveStateEntry *se;
2554
2555 trace_loadvm_state_cleanup();
2556 QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
2557 if (se->ops && se->ops->load_cleanup) {
2558 se->ops->load_cleanup(se->opaque);
2559 }
2560 }
2561}
2562
2563
2564static bool postcopy_pause_incoming(MigrationIncomingState *mis)
2565{
2566 trace_postcopy_pause_incoming();
2567
2568 assert(migrate_postcopy_ram());
2569
2570
2571 mis->postcopy_recover_triggered = false;
2572
2573
2574
2575
2576
2577 migration_ioc_unregister_yank_from_file(mis->from_src_file);
2578
2579 assert(mis->from_src_file);
2580 qemu_file_shutdown(mis->from_src_file);
2581 qemu_fclose(mis->from_src_file);
2582 mis->from_src_file = NULL;
2583
2584 assert(mis->to_src_file);
2585 qemu_file_shutdown(mis->to_src_file);
2586 qemu_mutex_lock(&mis->rp_mutex);
2587 qemu_fclose(mis->to_src_file);
2588 mis->to_src_file = NULL;
2589 qemu_mutex_unlock(&mis->rp_mutex);
2590
2591 migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
2592 MIGRATION_STATUS_POSTCOPY_PAUSED);
2593
2594
2595 postcopy_fault_thread_notify(mis);
2596
2597 error_report("Detected IO failure for postcopy. "
2598 "Migration paused.");
2599
2600 while (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) {
2601 qemu_sem_wait(&mis->postcopy_pause_sem_dst);
2602 }
2603
2604 trace_postcopy_pause_incoming_continued();
2605
2606 return true;
2607}
2608
2609int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis)
2610{
2611 uint8_t section_type;
2612 int ret = 0;
2613
2614retry:
2615 while (true) {
2616 section_type = qemu_get_byte(f);
2617
2618 if (qemu_file_get_error(f)) {
2619 ret = qemu_file_get_error(f);
2620 break;
2621 }
2622
2623 trace_qemu_loadvm_state_section(section_type);
2624 switch (section_type) {
2625 case QEMU_VM_SECTION_START:
2626 case QEMU_VM_SECTION_FULL:
2627 ret = qemu_loadvm_section_start_full(f, mis);
2628 if (ret < 0) {
2629 goto out;
2630 }
2631 break;
2632 case QEMU_VM_SECTION_PART:
2633 case QEMU_VM_SECTION_END:
2634 ret = qemu_loadvm_section_part_end(f, mis);
2635 if (ret < 0) {
2636 goto out;
2637 }
2638 break;
2639 case QEMU_VM_COMMAND:
2640 ret = loadvm_process_command(f);
2641 trace_qemu_loadvm_state_section_command(ret);
2642 if ((ret < 0) || (ret == LOADVM_QUIT)) {
2643 goto out;
2644 }
2645 break;
2646 case QEMU_VM_EOF:
2647
2648 goto out;
2649 default:
2650 error_report("Unknown savevm section type %d", section_type);
2651 ret = -EINVAL;
2652 goto out;
2653 }
2654 }
2655
2656out:
2657 if (ret < 0) {
2658 qemu_file_set_error(f, ret);
2659
2660
2661 dirty_bitmap_mig_cancel_incoming();
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674 if (postcopy_state_get() == POSTCOPY_INCOMING_RUNNING &&
2675 migrate_postcopy_ram() && postcopy_pause_incoming(mis)) {
2676
2677 f = mis->from_src_file;
2678 goto retry;
2679 }
2680 }
2681 return ret;
2682}
2683
2684int qemu_loadvm_state(QEMUFile *f)
2685{
2686 MigrationIncomingState *mis = migration_incoming_get_current();
2687 Error *local_err = NULL;
2688 int ret;
2689
2690 if (qemu_savevm_state_blocked(&local_err)) {
2691 error_report_err(local_err);
2692 return -EINVAL;
2693 }
2694
2695 ret = qemu_loadvm_state_header(f);
2696 if (ret) {
2697 return ret;
2698 }
2699
2700 if (qemu_loadvm_state_setup(f) != 0) {
2701 return -EINVAL;
2702 }
2703
2704 cpu_synchronize_all_pre_loadvm();
2705
2706 ret = qemu_loadvm_state_main(f, mis);
2707 qemu_event_set(&mis->main_thread_load_event);
2708
2709 trace_qemu_loadvm_state_post_main(ret);
2710
2711 if (mis->have_listen_thread) {
2712
2713 return ret;
2714 }
2715
2716 if (ret == 0) {
2717 ret = qemu_file_get_error(f);
2718 }
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730 if (ret == 0 && should_send_vmdesc()) {
2731 uint8_t *buf;
2732 uint32_t size;
2733 uint8_t section_type = qemu_get_byte(f);
2734
2735 if (section_type != QEMU_VM_VMDESCRIPTION) {
2736 error_report("Expected vmdescription section, but got %d",
2737 section_type);
2738
2739
2740
2741
2742 } else {
2743 buf = g_malloc(0x1000);
2744 size = qemu_get_be32(f);
2745
2746 while (size > 0) {
2747 uint32_t read_chunk = MIN(size, 0x1000);
2748 qemu_get_buffer(f, buf, read_chunk);
2749 size -= read_chunk;
2750 }
2751 g_free(buf);
2752 }
2753 }
2754
2755 qemu_loadvm_state_cleanup();
2756 cpu_synchronize_all_post_init();
2757
2758 return ret;
2759}
2760
2761int qemu_load_device_state(QEMUFile *f)
2762{
2763 MigrationIncomingState *mis = migration_incoming_get_current();
2764 int ret;
2765
2766
2767 ret = qemu_loadvm_state_main(f, mis);
2768 if (ret < 0) {
2769 error_report("Failed to load device state: %d", ret);
2770 return ret;
2771 }
2772
2773 cpu_synchronize_all_post_init();
2774 return 0;
2775}
2776
2777bool save_snapshot(const char *name, bool overwrite, const char *vmstate,
2778 bool has_devices, strList *devices, Error **errp)
2779{
2780 BlockDriverState *bs;
2781 QEMUSnapshotInfo sn1, *sn = &sn1;
2782 int ret = -1, ret2;
2783 QEMUFile *f;
2784 int saved_vm_running;
2785 uint64_t vm_state_size;
2786 g_autoptr(GDateTime) now = g_date_time_new_now_local();
2787 AioContext *aio_context;
2788
2789 if (migration_is_blocked(errp)) {
2790 return false;
2791 }
2792
2793 if (!replay_can_snapshot()) {
2794 error_setg(errp, "Record/replay does not allow making snapshot "
2795 "right now. Try once more later.");
2796 return false;
2797 }
2798
2799 if (!bdrv_all_can_snapshot(has_devices, devices, errp)) {
2800 return false;
2801 }
2802
2803
2804 if (name) {
2805 if (overwrite) {
2806 if (bdrv_all_delete_snapshot(name, has_devices,
2807 devices, errp) < 0) {
2808 return false;
2809 }
2810 } else {
2811 ret2 = bdrv_all_has_snapshot(name, has_devices, devices, errp);
2812 if (ret2 < 0) {
2813 return false;
2814 }
2815 if (ret2 == 1) {
2816 error_setg(errp,
2817 "Snapshot '%s' already exists in one or more devices",
2818 name);
2819 return false;
2820 }
2821 }
2822 }
2823
2824 bs = bdrv_all_find_vmstate_bs(vmstate, has_devices, devices, errp);
2825 if (bs == NULL) {
2826 return false;
2827 }
2828 aio_context = bdrv_get_aio_context(bs);
2829
2830 saved_vm_running = runstate_is_running();
2831
2832 ret = global_state_store();
2833 if (ret) {
2834 error_setg(errp, "Error saving global state");
2835 return false;
2836 }
2837 vm_stop(RUN_STATE_SAVE_VM);
2838
2839 bdrv_drain_all_begin();
2840
2841 aio_context_acquire(aio_context);
2842
2843 memset(sn, 0, sizeof(*sn));
2844
2845
2846 sn->date_sec = g_date_time_to_unix(now);
2847 sn->date_nsec = g_date_time_get_microsecond(now) * 1000;
2848 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
2849 if (replay_mode != REPLAY_MODE_NONE) {
2850 sn->icount = replay_get_current_icount();
2851 } else {
2852 sn->icount = -1ULL;
2853 }
2854
2855 if (name) {
2856 pstrcpy(sn->name, sizeof(sn->name), name);
2857 } else {
2858 g_autofree char *autoname = g_date_time_format(now, "vm-%Y%m%d%H%M%S");
2859 pstrcpy(sn->name, sizeof(sn->name), autoname);
2860 }
2861
2862
2863 f = qemu_fopen_bdrv(bs, 1);
2864 if (!f) {
2865 error_setg(errp, "Could not open VM state file");
2866 goto the_end;
2867 }
2868 ret = qemu_savevm_state(f, errp);
2869 vm_state_size = qemu_ftell(f);
2870 ret2 = qemu_fclose(f);
2871 if (ret < 0) {
2872 goto the_end;
2873 }
2874 if (ret2 < 0) {
2875 ret = ret2;
2876 goto the_end;
2877 }
2878
2879
2880
2881
2882
2883
2884 aio_context_release(aio_context);
2885 aio_context = NULL;
2886
2887 ret = bdrv_all_create_snapshot(sn, bs, vm_state_size,
2888 has_devices, devices, errp);
2889 if (ret < 0) {
2890 bdrv_all_delete_snapshot(sn->name, has_devices, devices, NULL);
2891 goto the_end;
2892 }
2893
2894 ret = 0;
2895
2896 the_end:
2897 if (aio_context) {
2898 aio_context_release(aio_context);
2899 }
2900
2901 bdrv_drain_all_end();
2902
2903 if (saved_vm_running) {
2904 vm_start();
2905 }
2906 return ret == 0;
2907}
2908
2909void qmp_xen_save_devices_state(const char *filename, bool has_live, bool live,
2910 Error **errp)
2911{
2912 QEMUFile *f;
2913 QIOChannelFile *ioc;
2914 int saved_vm_running;
2915 int ret;
2916
2917 if (!has_live) {
2918
2919
2920 live = true;
2921 }
2922
2923 saved_vm_running = runstate_is_running();
2924 vm_stop(RUN_STATE_SAVE_VM);
2925 global_state_store_running();
2926
2927 ioc = qio_channel_file_new_path(filename, O_WRONLY | O_CREAT | O_TRUNC,
2928 0660, errp);
2929 if (!ioc) {
2930 goto the_end;
2931 }
2932 qio_channel_set_name(QIO_CHANNEL(ioc), "migration-xen-save-state");
2933 f = qemu_fopen_channel_output(QIO_CHANNEL(ioc));
2934 object_unref(OBJECT(ioc));
2935 ret = qemu_save_device_state(f);
2936 if (ret < 0 || qemu_fclose(f) < 0) {
2937 error_setg(errp, QERR_IO_ERROR);
2938 } else {
2939
2940
2941
2942
2943
2944
2945 if (live && !saved_vm_running) {
2946 ret = bdrv_inactivate_all();
2947 if (ret) {
2948 error_setg(errp, "%s: bdrv_inactivate_all() failed (%d)",
2949 __func__, ret);
2950 }
2951 }
2952 }
2953
2954 the_end:
2955 if (saved_vm_running) {
2956 vm_start();
2957 }
2958}
2959
2960void qmp_xen_load_devices_state(const char *filename, Error **errp)
2961{
2962 QEMUFile *f;
2963 QIOChannelFile *ioc;
2964 int ret;
2965
2966
2967
2968
2969 if (runstate_is_running()) {
2970 error_setg(errp, "Cannot update device state while vm is running");
2971 return;
2972 }
2973 vm_stop(RUN_STATE_RESTORE_VM);
2974
2975 ioc = qio_channel_file_new_path(filename, O_RDONLY | O_BINARY, 0, errp);
2976 if (!ioc) {
2977 return;
2978 }
2979 qio_channel_set_name(QIO_CHANNEL(ioc), "migration-xen-load-state");
2980 f = qemu_fopen_channel_input(QIO_CHANNEL(ioc));
2981 object_unref(OBJECT(ioc));
2982
2983 ret = qemu_loadvm_state(f);
2984 qemu_fclose(f);
2985 if (ret < 0) {
2986 error_setg(errp, QERR_IO_ERROR);
2987 }
2988 migration_incoming_state_destroy();
2989}
2990
2991bool load_snapshot(const char *name, const char *vmstate,
2992 bool has_devices, strList *devices, Error **errp)
2993{
2994 BlockDriverState *bs_vm_state;
2995 QEMUSnapshotInfo sn;
2996 QEMUFile *f;
2997 int ret;
2998 AioContext *aio_context;
2999 MigrationIncomingState *mis = migration_incoming_get_current();
3000
3001 if (!bdrv_all_can_snapshot(has_devices, devices, errp)) {
3002 return false;
3003 }
3004 ret = bdrv_all_has_snapshot(name, has_devices, devices, errp);
3005 if (ret < 0) {
3006 return false;
3007 }
3008 if (ret == 0) {
3009 error_setg(errp, "Snapshot '%s' does not exist in one or more devices",
3010 name);
3011 return false;
3012 }
3013
3014 bs_vm_state = bdrv_all_find_vmstate_bs(vmstate, has_devices, devices, errp);
3015 if (!bs_vm_state) {
3016 return false;
3017 }
3018 aio_context = bdrv_get_aio_context(bs_vm_state);
3019
3020
3021 aio_context_acquire(aio_context);
3022 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
3023 aio_context_release(aio_context);
3024 if (ret < 0) {
3025 return false;
3026 } else if (sn.vm_state_size == 0) {
3027 error_setg(errp, "This is a disk-only snapshot. Revert to it "
3028 " offline using qemu-img");
3029 return false;
3030 }
3031
3032
3033
3034
3035
3036 replay_flush_events();
3037
3038
3039 bdrv_drain_all_begin();
3040
3041 ret = bdrv_all_goto_snapshot(name, has_devices, devices, errp);
3042 if (ret < 0) {
3043 goto err_drain;
3044 }
3045
3046
3047 f = qemu_fopen_bdrv(bs_vm_state, 0);
3048 if (!f) {
3049 error_setg(errp, "Could not open VM state file");
3050 goto err_drain;
3051 }
3052
3053 qemu_system_reset(SHUTDOWN_CAUSE_NONE);
3054 mis->from_src_file = f;
3055
3056 if (!yank_register_instance(MIGRATION_YANK_INSTANCE, errp)) {
3057 ret = -EINVAL;
3058 goto err_drain;
3059 }
3060 aio_context_acquire(aio_context);
3061 ret = qemu_loadvm_state(f);
3062 migration_incoming_state_destroy();
3063 aio_context_release(aio_context);
3064
3065 bdrv_drain_all_end();
3066
3067 if (ret < 0) {
3068 error_setg(errp, "Error %d while loading VM state", ret);
3069 return false;
3070 }
3071
3072 return true;
3073
3074err_drain:
3075 bdrv_drain_all_end();
3076 return false;
3077}
3078
3079bool delete_snapshot(const char *name, bool has_devices,
3080 strList *devices, Error **errp)
3081{
3082 if (!bdrv_all_can_snapshot(has_devices, devices, errp)) {
3083 return false;
3084 }
3085
3086 if (bdrv_all_delete_snapshot(name, has_devices, devices, errp) < 0) {
3087 return false;
3088 }
3089
3090 return true;
3091}
3092
3093void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
3094{
3095 qemu_ram_set_idstr(mr->ram_block,
3096 memory_region_name(mr), dev);
3097 qemu_ram_set_migratable(mr->ram_block);
3098}
3099
3100void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
3101{
3102 qemu_ram_unset_idstr(mr->ram_block);
3103 qemu_ram_unset_migratable(mr->ram_block);
3104}
3105
3106void vmstate_register_ram_global(MemoryRegion *mr)
3107{
3108 vmstate_register_ram(mr, NULL);
3109}
3110
3111bool vmstate_check_only_migratable(const VMStateDescription *vmsd)
3112{
3113
3114 if (!only_migratable) {
3115 return true;
3116 }
3117
3118 return !(vmsd && vmsd->unmigratable);
3119}
3120
3121typedef struct SnapshotJob {
3122 Job common;
3123 char *tag;
3124 char *vmstate;
3125 strList *devices;
3126 Coroutine *co;
3127 Error **errp;
3128 bool ret;
3129} SnapshotJob;
3130
3131static void qmp_snapshot_job_free(SnapshotJob *s)
3132{
3133 g_free(s->tag);
3134 g_free(s->vmstate);
3135 qapi_free_strList(s->devices);
3136}
3137
3138
3139static void snapshot_load_job_bh(void *opaque)
3140{
3141 Job *job = opaque;
3142 SnapshotJob *s = container_of(job, SnapshotJob, common);
3143 int orig_vm_running;
3144
3145 job_progress_set_remaining(&s->common, 1);
3146
3147 orig_vm_running = runstate_is_running();
3148 vm_stop(RUN_STATE_RESTORE_VM);
3149
3150 s->ret = load_snapshot(s->tag, s->vmstate, true, s->devices, s->errp);
3151 if (s->ret && orig_vm_running) {
3152 vm_start();
3153 }
3154
3155 job_progress_update(&s->common, 1);
3156
3157 qmp_snapshot_job_free(s);
3158 aio_co_wake(s->co);
3159}
3160
3161static void snapshot_save_job_bh(void *opaque)
3162{
3163 Job *job = opaque;
3164 SnapshotJob *s = container_of(job, SnapshotJob, common);
3165
3166 job_progress_set_remaining(&s->common, 1);
3167 s->ret = save_snapshot(s->tag, false, s->vmstate,
3168 true, s->devices, s->errp);
3169 job_progress_update(&s->common, 1);
3170
3171 qmp_snapshot_job_free(s);
3172 aio_co_wake(s->co);
3173}
3174
3175static void snapshot_delete_job_bh(void *opaque)
3176{
3177 Job *job = opaque;
3178 SnapshotJob *s = container_of(job, SnapshotJob, common);
3179
3180 job_progress_set_remaining(&s->common, 1);
3181 s->ret = delete_snapshot(s->tag, true, s->devices, s->errp);
3182 job_progress_update(&s->common, 1);
3183
3184 qmp_snapshot_job_free(s);
3185 aio_co_wake(s->co);
3186}
3187
3188static int coroutine_fn snapshot_save_job_run(Job *job, Error **errp)
3189{
3190 SnapshotJob *s = container_of(job, SnapshotJob, common);
3191 s->errp = errp;
3192 s->co = qemu_coroutine_self();
3193 aio_bh_schedule_oneshot(qemu_get_aio_context(),
3194 snapshot_save_job_bh, job);
3195 qemu_coroutine_yield();
3196 return s->ret ? 0 : -1;
3197}
3198
3199static int coroutine_fn snapshot_load_job_run(Job *job, Error **errp)
3200{
3201 SnapshotJob *s = container_of(job, SnapshotJob, common);
3202 s->errp = errp;
3203 s->co = qemu_coroutine_self();
3204 aio_bh_schedule_oneshot(qemu_get_aio_context(),
3205 snapshot_load_job_bh, job);
3206 qemu_coroutine_yield();
3207 return s->ret ? 0 : -1;
3208}
3209
3210static int coroutine_fn snapshot_delete_job_run(Job *job, Error **errp)
3211{
3212 SnapshotJob *s = container_of(job, SnapshotJob, common);
3213 s->errp = errp;
3214 s->co = qemu_coroutine_self();
3215 aio_bh_schedule_oneshot(qemu_get_aio_context(),
3216 snapshot_delete_job_bh, job);
3217 qemu_coroutine_yield();
3218 return s->ret ? 0 : -1;
3219}
3220
3221
3222static const JobDriver snapshot_load_job_driver = {
3223 .instance_size = sizeof(SnapshotJob),
3224 .job_type = JOB_TYPE_SNAPSHOT_LOAD,
3225 .run = snapshot_load_job_run,
3226};
3227
3228static const JobDriver snapshot_save_job_driver = {
3229 .instance_size = sizeof(SnapshotJob),
3230 .job_type = JOB_TYPE_SNAPSHOT_SAVE,
3231 .run = snapshot_save_job_run,
3232};
3233
3234static const JobDriver snapshot_delete_job_driver = {
3235 .instance_size = sizeof(SnapshotJob),
3236 .job_type = JOB_TYPE_SNAPSHOT_DELETE,
3237 .run = snapshot_delete_job_run,
3238};
3239
3240
3241void qmp_snapshot_save(const char *job_id,
3242 const char *tag,
3243 const char *vmstate,
3244 strList *devices,
3245 Error **errp)
3246{
3247 SnapshotJob *s;
3248
3249 s = job_create(job_id, &snapshot_save_job_driver, NULL,
3250 qemu_get_aio_context(), JOB_MANUAL_DISMISS,
3251 NULL, NULL, errp);
3252 if (!s) {
3253 return;
3254 }
3255
3256 s->tag = g_strdup(tag);
3257 s->vmstate = g_strdup(vmstate);
3258 s->devices = QAPI_CLONE(strList, devices);
3259
3260 job_start(&s->common);
3261}
3262
3263void qmp_snapshot_load(const char *job_id,
3264 const char *tag,
3265 const char *vmstate,
3266 strList *devices,
3267 Error **errp)
3268{
3269 SnapshotJob *s;
3270
3271 s = job_create(job_id, &snapshot_load_job_driver, NULL,
3272 qemu_get_aio_context(), JOB_MANUAL_DISMISS,
3273 NULL, NULL, errp);
3274 if (!s) {
3275 return;
3276 }
3277
3278 s->tag = g_strdup(tag);
3279 s->vmstate = g_strdup(vmstate);
3280 s->devices = QAPI_CLONE(strList, devices);
3281
3282 job_start(&s->common);
3283}
3284
3285void qmp_snapshot_delete(const char *job_id,
3286 const char *tag,
3287 strList *devices,
3288 Error **errp)
3289{
3290 SnapshotJob *s;
3291
3292 s = job_create(job_id, &snapshot_delete_job_driver, NULL,
3293 qemu_get_aio_context(), JOB_MANUAL_DISMISS,
3294 NULL, NULL, errp);
3295 if (!s) {
3296 return;
3297 }
3298
3299 s->tag = g_strdup(tag);
3300 s->devices = QAPI_CLONE(strList, devices);
3301
3302 job_start(&s->common);
3303}
3304