4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2009-2015 Red Hat Inc
8 * Juan Quintela <quintela@redhat.com>
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
29 #include "qemu/osdep.h"
30 #include "hw/boards.h"
32 #include "migration.h"
33 #include "migration/snapshot.h"
34 #include "migration-stats.h"
35 #include "migration/vmstate.h"
36 #include "migration/misc.h"
37 #include "migration/register.h"
38 #include "migration/global_state.h"
39 #include "migration/channel-block.h"
41 #include "qemu-file.h"
43 #include "postcopy-ram.h"
44 #include "qapi/error.h"
45 #include "qapi/qapi-commands-migration.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"
56 #include "qemu/main-loop.h"
57 #include "block/snapshot.h"
58 #include "qemu/cutils.h"
59 #include "io/channel-buffer.h"
60 #include "io/channel-file.h"
61 #include "sysemu/replay.h"
62 #include "sysemu/runstate.h"
63 #include "sysemu/sysemu.h"
64 #include "sysemu/xen.h"
65 #include "migration/colo.h"
66 #include "qemu/bitmap.h"
67 #include "net/announce.h"
68 #include "qemu/yank.h"
69 #include "yank_functions.h"
70 #include "sysemu/qtest.h"
73 const unsigned int postcopy_ram_discard_version
;
75 /* Subcommands for QEMU_VM_COMMAND */
77 MIG_CMD_INVALID
= 0, /* Must be 0 */
78 MIG_CMD_OPEN_RETURN_PATH
, /* Tell the dest to open the Return path */
79 MIG_CMD_PING
, /* Request a PONG on the RP */
81 MIG_CMD_POSTCOPY_ADVISE
, /* Prior to any page transfers, just
82 warn we might want to do PC */
83 MIG_CMD_POSTCOPY_LISTEN
, /* Start listening for incoming
84 pages as it's running. */
85 MIG_CMD_POSTCOPY_RUN
, /* Start execution */
87 MIG_CMD_POSTCOPY_RAM_DISCARD
, /* A list of pages to discard that
88 were previously sent during
89 precopy but are dirty. */
90 MIG_CMD_PACKAGED
, /* Send a wrapped stream within this stream */
91 MIG_CMD_ENABLE_COLO
, /* Enable COLO */
92 MIG_CMD_POSTCOPY_RESUME
, /* resume postcopy on dest */
93 MIG_CMD_RECV_BITMAP
, /* Request for recved bitmap on dst */
97 #define MAX_VM_CMD_PACKAGED_SIZE UINT32_MAX
98 static struct mig_cmd_args
{
99 ssize_t len
; /* -1 = variable */
102 [MIG_CMD_INVALID
] = { .len
= -1, .name
= "INVALID" },
103 [MIG_CMD_OPEN_RETURN_PATH
] = { .len
= 0, .name
= "OPEN_RETURN_PATH" },
104 [MIG_CMD_PING
] = { .len
= sizeof(uint32_t), .name
= "PING" },
105 [MIG_CMD_POSTCOPY_ADVISE
] = { .len
= -1, .name
= "POSTCOPY_ADVISE" },
106 [MIG_CMD_POSTCOPY_LISTEN
] = { .len
= 0, .name
= "POSTCOPY_LISTEN" },
107 [MIG_CMD_POSTCOPY_RUN
] = { .len
= 0, .name
= "POSTCOPY_RUN" },
108 [MIG_CMD_POSTCOPY_RAM_DISCARD
] = {
109 .len
= -1, .name
= "POSTCOPY_RAM_DISCARD" },
110 [MIG_CMD_POSTCOPY_RESUME
] = { .len
= 0, .name
= "POSTCOPY_RESUME" },
111 [MIG_CMD_PACKAGED
] = { .len
= 4, .name
= "PACKAGED" },
112 [MIG_CMD_RECV_BITMAP
] = { .len
= -1, .name
= "RECV_BITMAP" },
113 [MIG_CMD_MAX
] = { .len
= -1, .name
= "MAX" },
116 /* Note for MIG_CMD_POSTCOPY_ADVISE:
117 * The format of arguments is depending on postcopy mode:
118 * - postcopy RAM only
119 * uint64_t host page size
120 * uint64_t taget page size
122 * - postcopy RAM and postcopy dirty bitmaps
123 * format is the same as for postcopy RAM only
125 * - postcopy dirty bitmaps only
126 * Nothing. Command length field is 0.
128 * Be careful: adding a new postcopy entity with some other parameters should
129 * not break format self-description ability. Good way is to introduce some
130 * generic extendable format with an exception for two old entities.
133 /***********************************************************/
134 /* savevm/loadvm support */
136 static QEMUFile
*qemu_fopen_bdrv(BlockDriverState
*bs
, int is_writable
)
139 return qemu_file_new_output(QIO_CHANNEL(qio_channel_block_new(bs
)));
141 return qemu_file_new_input(QIO_CHANNEL(qio_channel_block_new(bs
)));
146 /* QEMUFile timer support.
147 * Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c
150 void timer_put(QEMUFile
*f
, QEMUTimer
*ts
)
152 uint64_t expire_time
;
154 expire_time
= timer_expire_time_ns(ts
);
155 qemu_put_be64(f
, expire_time
);
158 void timer_get(QEMUFile
*f
, QEMUTimer
*ts
)
160 uint64_t expire_time
;
162 expire_time
= qemu_get_be64(f
);
163 if (expire_time
!= -1) {
164 timer_mod_ns(ts
, expire_time
);
171 /* VMState timer support.
172 * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c
175 static int get_timer(QEMUFile
*f
, void *pv
, size_t size
,
176 const VMStateField
*field
)
183 static int put_timer(QEMUFile
*f
, void *pv
, size_t size
,
184 const VMStateField
*field
, JSONWriter
*vmdesc
)
192 const VMStateInfo vmstate_info_timer
= {
199 typedef struct CompatEntry
{
204 typedef struct SaveStateEntry
{
205 QTAILQ_ENTRY(SaveStateEntry
) entry
;
207 uint32_t instance_id
;
210 /* version id read from the stream */
213 /* section id read from the stream */
215 const SaveVMHandlers
*ops
;
216 const VMStateDescription
*vmsd
;
222 typedef struct SaveState
{
223 QTAILQ_HEAD(, SaveStateEntry
) handlers
;
224 SaveStateEntry
*handler_pri_head
[MIG_PRI_MAX
+ 1];
225 int global_section_id
;
228 uint32_t target_page_bits
;
230 MigrationCapability
*capabilities
;
234 static SaveState savevm_state
= {
235 .handlers
= QTAILQ_HEAD_INITIALIZER(savevm_state
.handlers
),
236 .handler_pri_head
= { [MIG_PRI_DEFAULT
... MIG_PRI_MAX
] = NULL
},
237 .global_section_id
= 0,
240 static bool should_validate_capability(int capability
)
242 assert(capability
>= 0 && capability
< MIGRATION_CAPABILITY__MAX
);
243 /* Validate only new capabilities to keep compatibility. */
244 switch (capability
) {
245 case MIGRATION_CAPABILITY_X_IGNORE_SHARED
:
252 static uint32_t get_validatable_capabilities_count(void)
254 MigrationState
*s
= migrate_get_current();
257 for (i
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
258 if (should_validate_capability(i
) && s
->capabilities
[i
]) {
265 static int configuration_pre_save(void *opaque
)
267 SaveState
*state
= opaque
;
268 const char *current_name
= MACHINE_GET_CLASS(current_machine
)->name
;
269 MigrationState
*s
= migrate_get_current();
272 state
->len
= strlen(current_name
);
273 state
->name
= current_name
;
274 state
->target_page_bits
= qemu_target_page_bits();
276 state
->caps_count
= get_validatable_capabilities_count();
277 state
->capabilities
= g_renew(MigrationCapability
, state
->capabilities
,
279 for (i
= j
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
280 if (should_validate_capability(i
) && s
->capabilities
[i
]) {
281 state
->capabilities
[j
++] = i
;
284 state
->uuid
= qemu_uuid
;
289 static int configuration_post_save(void *opaque
)
291 SaveState
*state
= opaque
;
293 g_free(state
->capabilities
);
294 state
->capabilities
= NULL
;
295 state
->caps_count
= 0;
299 static int configuration_pre_load(void *opaque
)
301 SaveState
*state
= opaque
;
303 /* If there is no target-page-bits subsection it means the source
304 * predates the variable-target-page-bits support and is using the
305 * minimum possible value for this CPU.
307 state
->target_page_bits
= qemu_target_page_bits_min();
311 static bool configuration_validate_capabilities(SaveState
*state
)
314 MigrationState
*s
= migrate_get_current();
315 unsigned long *source_caps_bm
;
318 source_caps_bm
= bitmap_new(MIGRATION_CAPABILITY__MAX
);
319 for (i
= 0; i
< state
->caps_count
; i
++) {
320 MigrationCapability capability
= state
->capabilities
[i
];
321 set_bit(capability
, source_caps_bm
);
324 for (i
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
325 bool source_state
, target_state
;
326 if (!should_validate_capability(i
)) {
329 source_state
= test_bit(i
, source_caps_bm
);
330 target_state
= s
->capabilities
[i
];
331 if (source_state
!= target_state
) {
332 error_report("Capability %s is %s, but received capability is %s",
333 MigrationCapability_str(i
),
334 target_state
? "on" : "off",
335 source_state
? "on" : "off");
337 /* Don't break here to report all failed capabilities */
341 g_free(source_caps_bm
);
345 static int configuration_post_load(void *opaque
, int version_id
)
347 SaveState
*state
= opaque
;
348 const char *current_name
= MACHINE_GET_CLASS(current_machine
)->name
;
351 if (strncmp(state
->name
, current_name
, state
->len
) != 0) {
352 error_report("Machine type received is '%.*s' and local is '%s'",
353 (int) state
->len
, state
->name
, current_name
);
358 if (state
->target_page_bits
!= qemu_target_page_bits()) {
359 error_report("Received TARGET_PAGE_BITS is %d but local is %d",
360 state
->target_page_bits
, qemu_target_page_bits());
365 if (!configuration_validate_capabilities(state
)) {
371 g_free((void *)state
->name
);
374 g_free(state
->capabilities
);
375 state
->capabilities
= NULL
;
376 state
->caps_count
= 0;
381 static int get_capability(QEMUFile
*f
, void *pv
, size_t size
,
382 const VMStateField
*field
)
384 MigrationCapability
*capability
= pv
;
385 char capability_str
[UINT8_MAX
+ 1];
389 len
= qemu_get_byte(f
);
390 qemu_get_buffer(f
, (uint8_t *)capability_str
, len
);
391 capability_str
[len
] = '\0';
392 for (i
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
393 if (!strcmp(MigrationCapability_str(i
), capability_str
)) {
398 error_report("Received unknown capability %s", capability_str
);
402 static int put_capability(QEMUFile
*f
, void *pv
, size_t size
,
403 const VMStateField
*field
, JSONWriter
*vmdesc
)
405 MigrationCapability
*capability
= pv
;
406 const char *capability_str
= MigrationCapability_str(*capability
);
407 size_t len
= strlen(capability_str
);
408 assert(len
<= UINT8_MAX
);
410 qemu_put_byte(f
, len
);
411 qemu_put_buffer(f
, (uint8_t *)capability_str
, len
);
415 static const VMStateInfo vmstate_info_capability
= {
416 .name
= "capability",
417 .get
= get_capability
,
418 .put
= put_capability
,
421 /* The target-page-bits subsection is present only if the
422 * target page size is not the same as the default (ie the
423 * minimum page size for a variable-page-size guest CPU).
424 * If it is present then it contains the actual target page
425 * bits for the machine, and migration will fail if the
426 * two ends don't agree about it.
428 static bool vmstate_target_page_bits_needed(void *opaque
)
430 return qemu_target_page_bits()
431 > qemu_target_page_bits_min();
434 static const VMStateDescription vmstate_target_page_bits
= {
435 .name
= "configuration/target-page-bits",
437 .minimum_version_id
= 1,
438 .needed
= vmstate_target_page_bits_needed
,
439 .fields
= (VMStateField
[]) {
440 VMSTATE_UINT32(target_page_bits
, SaveState
),
441 VMSTATE_END_OF_LIST()
445 static bool vmstate_capabilites_needed(void *opaque
)
447 return get_validatable_capabilities_count() > 0;
450 static const VMStateDescription vmstate_capabilites
= {
451 .name
= "configuration/capabilities",
453 .minimum_version_id
= 1,
454 .needed
= vmstate_capabilites_needed
,
455 .fields
= (VMStateField
[]) {
456 VMSTATE_UINT32_V(caps_count
, SaveState
, 1),
457 VMSTATE_VARRAY_UINT32_ALLOC(capabilities
, SaveState
, caps_count
, 1,
458 vmstate_info_capability
,
459 MigrationCapability
),
460 VMSTATE_END_OF_LIST()
464 static bool vmstate_uuid_needed(void *opaque
)
466 return qemu_uuid_set
&& migrate_validate_uuid();
469 static int vmstate_uuid_post_load(void *opaque
, int version_id
)
471 SaveState
*state
= opaque
;
472 char uuid_src
[UUID_FMT_LEN
+ 1];
473 char uuid_dst
[UUID_FMT_LEN
+ 1];
475 if (!qemu_uuid_set
) {
477 * It's warning because user might not know UUID in some cases,
478 * e.g. load an old snapshot
480 qemu_uuid_unparse(&state
->uuid
, uuid_src
);
481 warn_report("UUID is received %s, but local uuid isn't set",
485 if (!qemu_uuid_is_equal(&state
->uuid
, &qemu_uuid
)) {
486 qemu_uuid_unparse(&state
->uuid
, uuid_src
);
487 qemu_uuid_unparse(&qemu_uuid
, uuid_dst
);
488 error_report("UUID received is %s and local is %s", uuid_src
, uuid_dst
);
494 static const VMStateDescription vmstate_uuid
= {
495 .name
= "configuration/uuid",
497 .minimum_version_id
= 1,
498 .needed
= vmstate_uuid_needed
,
499 .post_load
= vmstate_uuid_post_load
,
500 .fields
= (VMStateField
[]) {
501 VMSTATE_UINT8_ARRAY_V(uuid
.data
, SaveState
, sizeof(QemuUUID
), 1),
502 VMSTATE_END_OF_LIST()
506 static const VMStateDescription vmstate_configuration
= {
507 .name
= "configuration",
509 .pre_load
= configuration_pre_load
,
510 .post_load
= configuration_post_load
,
511 .pre_save
= configuration_pre_save
,
512 .post_save
= configuration_post_save
,
513 .fields
= (VMStateField
[]) {
514 VMSTATE_UINT32(len
, SaveState
),
515 VMSTATE_VBUFFER_ALLOC_UINT32(name
, SaveState
, 0, NULL
, len
),
516 VMSTATE_END_OF_LIST()
518 .subsections
= (const VMStateDescription
*[]) {
519 &vmstate_target_page_bits
,
520 &vmstate_capabilites
,
526 static void dump_vmstate_vmsd(FILE *out_file
,
527 const VMStateDescription
*vmsd
, int indent
,
530 static void dump_vmstate_vmsf(FILE *out_file
, const VMStateField
*field
,
533 fprintf(out_file
, "%*s{\n", indent
, "");
535 fprintf(out_file
, "%*s\"field\": \"%s\",\n", indent
, "", field
->name
);
536 fprintf(out_file
, "%*s\"version_id\": %d,\n", indent
, "",
538 fprintf(out_file
, "%*s\"field_exists\": %s,\n", indent
, "",
539 field
->field_exists
? "true" : "false");
540 if (field
->flags
& VMS_ARRAY
) {
541 fprintf(out_file
, "%*s\"num\": %d,\n", indent
, "", field
->num
);
543 fprintf(out_file
, "%*s\"size\": %zu", indent
, "", field
->size
);
544 if (field
->vmsd
!= NULL
) {
545 fprintf(out_file
, ",\n");
546 dump_vmstate_vmsd(out_file
, field
->vmsd
, indent
, false);
548 fprintf(out_file
, "\n%*s}", indent
- 2, "");
551 static void dump_vmstate_vmss(FILE *out_file
,
552 const VMStateDescription
**subsection
,
555 if (*subsection
!= NULL
) {
556 dump_vmstate_vmsd(out_file
, *subsection
, indent
, true);
560 static void dump_vmstate_vmsd(FILE *out_file
,
561 const VMStateDescription
*vmsd
, int indent
,
565 fprintf(out_file
, "%*s{\n", indent
, "");
567 fprintf(out_file
, "%*s\"%s\": {\n", indent
, "", "Description");
570 fprintf(out_file
, "%*s\"name\": \"%s\",\n", indent
, "", vmsd
->name
);
571 fprintf(out_file
, "%*s\"version_id\": %d,\n", indent
, "",
573 fprintf(out_file
, "%*s\"minimum_version_id\": %d", indent
, "",
574 vmsd
->minimum_version_id
);
575 if (vmsd
->fields
!= NULL
) {
576 const VMStateField
*field
= vmsd
->fields
;
579 fprintf(out_file
, ",\n%*s\"Fields\": [\n", indent
, "");
581 while (field
->name
!= NULL
) {
582 if (field
->flags
& VMS_MUST_EXIST
) {
583 /* Ignore VMSTATE_VALIDATE bits; these don't get migrated */
588 fprintf(out_file
, ",\n");
590 dump_vmstate_vmsf(out_file
, field
, indent
+ 2);
594 assert(field
->flags
== VMS_END
);
595 fprintf(out_file
, "\n%*s]", indent
, "");
597 if (vmsd
->subsections
!= NULL
) {
598 const VMStateDescription
**subsection
= vmsd
->subsections
;
601 fprintf(out_file
, ",\n%*s\"Subsections\": [\n", indent
, "");
603 while (*subsection
!= NULL
) {
605 fprintf(out_file
, ",\n");
607 dump_vmstate_vmss(out_file
, subsection
, indent
+ 2);
611 fprintf(out_file
, "\n%*s]", indent
, "");
613 fprintf(out_file
, "\n%*s}", indent
- 2, "");
616 static void dump_machine_type(FILE *out_file
)
620 mc
= MACHINE_GET_CLASS(current_machine
);
622 fprintf(out_file
, " \"vmschkmachine\": {\n");
623 fprintf(out_file
, " \"Name\": \"%s\"\n", mc
->name
);
624 fprintf(out_file
, " },\n");
627 void dump_vmstate_json_to_file(FILE *out_file
)
632 fprintf(out_file
, "{\n");
633 dump_machine_type(out_file
);
636 list
= object_class_get_list(TYPE_DEVICE
, true);
637 for (elt
= list
; elt
; elt
= elt
->next
) {
638 DeviceClass
*dc
= OBJECT_CLASS_CHECK(DeviceClass
, elt
->data
,
648 fprintf(out_file
, ",\n");
650 name
= object_class_get_name(OBJECT_CLASS(dc
));
651 fprintf(out_file
, "%*s\"%s\": {\n", indent
, "", name
);
653 fprintf(out_file
, "%*s\"Name\": \"%s\",\n", indent
, "", name
);
654 fprintf(out_file
, "%*s\"version_id\": %d,\n", indent
, "",
655 dc
->vmsd
->version_id
);
656 fprintf(out_file
, "%*s\"minimum_version_id\": %d,\n", indent
, "",
657 dc
->vmsd
->minimum_version_id
);
659 dump_vmstate_vmsd(out_file
, dc
->vmsd
, indent
, false);
661 fprintf(out_file
, "\n%*s}", indent
- 2, "");
664 fprintf(out_file
, "\n}\n");
669 static uint32_t calculate_new_instance_id(const char *idstr
)
672 uint32_t instance_id
= 0;
674 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
675 if (strcmp(idstr
, se
->idstr
) == 0
676 && instance_id
<= se
->instance_id
) {
677 instance_id
= se
->instance_id
+ 1;
680 /* Make sure we never loop over without being noticed */
681 assert(instance_id
!= VMSTATE_INSTANCE_ID_ANY
);
685 static int calculate_compat_instance_id(const char *idstr
)
690 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
695 if (strcmp(idstr
, se
->compat
->idstr
) == 0
696 && instance_id
<= se
->compat
->instance_id
) {
697 instance_id
= se
->compat
->instance_id
+ 1;
703 static inline MigrationPriority
save_state_priority(SaveStateEntry
*se
)
706 return se
->vmsd
->priority
;
708 return MIG_PRI_DEFAULT
;
711 static void savevm_state_handler_insert(SaveStateEntry
*nse
)
713 MigrationPriority priority
= save_state_priority(nse
);
717 assert(priority
<= MIG_PRI_MAX
);
719 for (i
= priority
- 1; i
>= 0; i
--) {
720 se
= savevm_state
.handler_pri_head
[i
];
722 assert(save_state_priority(se
) < priority
);
728 QTAILQ_INSERT_BEFORE(se
, nse
, entry
);
730 QTAILQ_INSERT_TAIL(&savevm_state
.handlers
, nse
, entry
);
733 if (savevm_state
.handler_pri_head
[priority
] == NULL
) {
734 savevm_state
.handler_pri_head
[priority
] = nse
;
738 static void savevm_state_handler_remove(SaveStateEntry
*se
)
740 SaveStateEntry
*next
;
741 MigrationPriority priority
= save_state_priority(se
);
743 if (se
== savevm_state
.handler_pri_head
[priority
]) {
744 next
= QTAILQ_NEXT(se
, entry
);
745 if (next
!= NULL
&& save_state_priority(next
) == priority
) {
746 savevm_state
.handler_pri_head
[priority
] = next
;
748 savevm_state
.handler_pri_head
[priority
] = NULL
;
751 QTAILQ_REMOVE(&savevm_state
.handlers
, se
, entry
);
754 /* TODO: Individual devices generally have very little idea about the rest
755 of the system, so instance_id should be removed/replaced.
756 Meanwhile pass -1 as instance_id if you do not already have a clearly
757 distinguishing id for all instances of your device class. */
758 int register_savevm_live(const char *idstr
,
759 uint32_t instance_id
,
761 const SaveVMHandlers
*ops
,
766 se
= g_new0(SaveStateEntry
, 1);
767 se
->version_id
= version_id
;
768 se
->section_id
= savevm_state
.global_section_id
++;
772 /* if this is a live_savem then set is_ram */
773 if (ops
->save_setup
!= NULL
) {
777 pstrcat(se
->idstr
, sizeof(se
->idstr
), idstr
);
779 if (instance_id
== VMSTATE_INSTANCE_ID_ANY
) {
780 se
->instance_id
= calculate_new_instance_id(se
->idstr
);
782 se
->instance_id
= instance_id
;
784 assert(!se
->compat
|| se
->instance_id
== 0);
785 savevm_state_handler_insert(se
);
789 void unregister_savevm(VMStateIf
*obj
, const char *idstr
, void *opaque
)
791 SaveStateEntry
*se
, *new_se
;
795 char *oid
= vmstate_if_get_id(obj
);
797 pstrcpy(id
, sizeof(id
), oid
);
798 pstrcat(id
, sizeof(id
), "/");
802 pstrcat(id
, sizeof(id
), idstr
);
804 QTAILQ_FOREACH_SAFE(se
, &savevm_state
.handlers
, entry
, new_se
) {
805 if (strcmp(se
->idstr
, id
) == 0 && se
->opaque
== opaque
) {
806 savevm_state_handler_remove(se
);
814 * Perform some basic checks on vmsd's at registration
817 static void vmstate_check(const VMStateDescription
*vmsd
)
819 const VMStateField
*field
= vmsd
->fields
;
820 const VMStateDescription
**subsection
= vmsd
->subsections
;
823 while (field
->name
) {
824 if (field
->flags
& (VMS_STRUCT
| VMS_VSTRUCT
)) {
825 /* Recurse to sub structures */
826 vmstate_check(field
->vmsd
);
831 /* Check for the end of field list canary */
832 if (field
->flags
!= VMS_END
) {
833 error_report("VMSTATE not ending with VMS_END: %s", vmsd
->name
);
834 g_assert_not_reached();
838 while (subsection
&& *subsection
) {
840 * The name of a subsection should start with the name of the
843 assert(!strncmp(vmsd
->name
, (*subsection
)->name
, strlen(vmsd
->name
)));
844 vmstate_check(*subsection
);
849 int vmstate_register_with_alias_id(VMStateIf
*obj
, uint32_t instance_id
,
850 const VMStateDescription
*vmsd
,
851 void *opaque
, int alias_id
,
852 int required_for_version
,
857 /* If this triggers, alias support can be dropped for the vmsd. */
858 assert(alias_id
== -1 || required_for_version
>= vmsd
->minimum_version_id
);
860 se
= g_new0(SaveStateEntry
, 1);
861 se
->version_id
= vmsd
->version_id
;
862 se
->section_id
= savevm_state
.global_section_id
++;
865 se
->alias_id
= alias_id
;
868 char *id
= vmstate_if_get_id(obj
);
870 if (snprintf(se
->idstr
, sizeof(se
->idstr
), "%s/", id
) >=
872 error_setg(errp
, "Path too long for VMState (%s)", id
);
880 se
->compat
= g_new0(CompatEntry
, 1);
881 pstrcpy(se
->compat
->idstr
, sizeof(se
->compat
->idstr
), vmsd
->name
);
882 se
->compat
->instance_id
= instance_id
== VMSTATE_INSTANCE_ID_ANY
?
883 calculate_compat_instance_id(vmsd
->name
) : instance_id
;
884 instance_id
= VMSTATE_INSTANCE_ID_ANY
;
887 pstrcat(se
->idstr
, sizeof(se
->idstr
), vmsd
->name
);
889 if (instance_id
== VMSTATE_INSTANCE_ID_ANY
) {
890 se
->instance_id
= calculate_new_instance_id(se
->idstr
);
892 se
->instance_id
= instance_id
;
895 /* Perform a recursive sanity check during the test runs */
896 if (qtest_enabled()) {
899 assert(!se
->compat
|| se
->instance_id
== 0);
900 savevm_state_handler_insert(se
);
904 void vmstate_unregister(VMStateIf
*obj
, const VMStateDescription
*vmsd
,
907 SaveStateEntry
*se
, *new_se
;
909 QTAILQ_FOREACH_SAFE(se
, &savevm_state
.handlers
, entry
, new_se
) {
910 if (se
->vmsd
== vmsd
&& se
->opaque
== opaque
) {
911 savevm_state_handler_remove(se
);
918 static int vmstate_load(QEMUFile
*f
, SaveStateEntry
*se
)
920 trace_vmstate_load(se
->idstr
, se
->vmsd
? se
->vmsd
->name
: "(old)");
921 if (!se
->vmsd
) { /* Old style */
922 return se
->ops
->load_state(f
, se
->opaque
, se
->load_version_id
);
924 return vmstate_load_state(f
, se
->vmsd
, se
->opaque
, se
->load_version_id
);
927 static void vmstate_save_old_style(QEMUFile
*f
, SaveStateEntry
*se
,
930 int64_t old_offset
, size
;
932 old_offset
= qemu_file_total_transferred_fast(f
);
933 se
->ops
->save_state(f
, se
->opaque
);
934 size
= qemu_file_total_transferred_fast(f
) - old_offset
;
937 json_writer_int64(vmdesc
, "size", size
);
938 json_writer_start_array(vmdesc
, "fields");
939 json_writer_start_object(vmdesc
, NULL
);
940 json_writer_str(vmdesc
, "name", "data");
941 json_writer_int64(vmdesc
, "size", size
);
942 json_writer_str(vmdesc
, "type", "buffer");
943 json_writer_end_object(vmdesc
);
944 json_writer_end_array(vmdesc
);
949 * Write the header for device section (QEMU_VM_SECTION START/END/PART/FULL)
951 static void save_section_header(QEMUFile
*f
, SaveStateEntry
*se
,
952 uint8_t section_type
)
954 qemu_put_byte(f
, section_type
);
955 qemu_put_be32(f
, se
->section_id
);
957 if (section_type
== QEMU_VM_SECTION_FULL
||
958 section_type
== QEMU_VM_SECTION_START
) {
960 size_t len
= strlen(se
->idstr
);
961 qemu_put_byte(f
, len
);
962 qemu_put_buffer(f
, (uint8_t *)se
->idstr
, len
);
964 qemu_put_be32(f
, se
->instance_id
);
965 qemu_put_be32(f
, se
->version_id
);
970 * Write a footer onto device sections that catches cases misformatted device
973 static void save_section_footer(QEMUFile
*f
, SaveStateEntry
*se
)
975 if (migrate_get_current()->send_section_footer
) {
976 qemu_put_byte(f
, QEMU_VM_SECTION_FOOTER
);
977 qemu_put_be32(f
, se
->section_id
);
981 static int vmstate_save(QEMUFile
*f
, SaveStateEntry
*se
, JSONWriter
*vmdesc
)
985 if ((!se
->ops
|| !se
->ops
->save_state
) && !se
->vmsd
) {
988 if (se
->vmsd
&& !vmstate_save_needed(se
->vmsd
, se
->opaque
)) {
989 trace_savevm_section_skip(se
->idstr
, se
->section_id
);
993 trace_savevm_section_start(se
->idstr
, se
->section_id
);
994 save_section_header(f
, se
, QEMU_VM_SECTION_FULL
);
996 json_writer_start_object(vmdesc
, NULL
);
997 json_writer_str(vmdesc
, "name", se
->idstr
);
998 json_writer_int64(vmdesc
, "instance_id", se
->instance_id
);
1001 trace_vmstate_save(se
->idstr
, se
->vmsd
? se
->vmsd
->name
: "(old)");
1003 vmstate_save_old_style(f
, se
, vmdesc
);
1005 ret
= vmstate_save_state(f
, se
->vmsd
, se
->opaque
, vmdesc
);
1011 trace_savevm_section_end(se
->idstr
, se
->section_id
, 0);
1012 save_section_footer(f
, se
);
1014 json_writer_end_object(vmdesc
);
1019 * qemu_savevm_command_send: Send a 'QEMU_VM_COMMAND' type element with the
1020 * command and associated data.
1022 * @f: File to send command on
1023 * @command: Command type to send
1024 * @len: Length of associated data
1025 * @data: Data associated with command.
1027 static void qemu_savevm_command_send(QEMUFile
*f
,
1028 enum qemu_vm_cmd command
,
1032 trace_savevm_command_send(command
, len
);
1033 qemu_put_byte(f
, QEMU_VM_COMMAND
);
1034 qemu_put_be16(f
, (uint16_t)command
);
1035 qemu_put_be16(f
, len
);
1036 qemu_put_buffer(f
, data
, len
);
1040 void qemu_savevm_send_colo_enable(QEMUFile
*f
)
1042 trace_savevm_send_colo_enable();
1043 qemu_savevm_command_send(f
, MIG_CMD_ENABLE_COLO
, 0, NULL
);
1046 void qemu_savevm_send_ping(QEMUFile
*f
, uint32_t value
)
1050 trace_savevm_send_ping(value
);
1051 buf
= cpu_to_be32(value
);
1052 qemu_savevm_command_send(f
, MIG_CMD_PING
, sizeof(value
), (uint8_t *)&buf
);
1055 void qemu_savevm_send_open_return_path(QEMUFile
*f
)
1057 trace_savevm_send_open_return_path();
1058 qemu_savevm_command_send(f
, MIG_CMD_OPEN_RETURN_PATH
, 0, NULL
);
1061 /* We have a buffer of data to send; we don't want that all to be loaded
1062 * by the command itself, so the command contains just the length of the
1063 * extra buffer that we then send straight after it.
1064 * TODO: Must be a better way to organise that
1070 int qemu_savevm_send_packaged(QEMUFile
*f
, const uint8_t *buf
, size_t len
)
1074 if (len
> MAX_VM_CMD_PACKAGED_SIZE
) {
1075 error_report("%s: Unreasonably large packaged state: %zu",
1080 tmp
= cpu_to_be32(len
);
1082 trace_qemu_savevm_send_packaged();
1083 qemu_savevm_command_send(f
, MIG_CMD_PACKAGED
, 4, (uint8_t *)&tmp
);
1085 qemu_put_buffer(f
, buf
, len
);
1090 /* Send prior to any postcopy transfer */
1091 void qemu_savevm_send_postcopy_advise(QEMUFile
*f
)
1093 if (migrate_postcopy_ram()) {
1095 tmp
[0] = cpu_to_be64(ram_pagesize_summary());
1096 tmp
[1] = cpu_to_be64(qemu_target_page_size());
1098 trace_qemu_savevm_send_postcopy_advise();
1099 qemu_savevm_command_send(f
, MIG_CMD_POSTCOPY_ADVISE
,
1100 16, (uint8_t *)tmp
);
1102 qemu_savevm_command_send(f
, MIG_CMD_POSTCOPY_ADVISE
, 0, NULL
);
1106 /* Sent prior to starting the destination running in postcopy, discard pages
1107 * that have already been sent but redirtied on the source.
1108 * CMD_POSTCOPY_RAM_DISCARD consist of:
1110 * byte Length of name field (not including 0)
1111 * n x byte RAM block name
1112 * byte 0 terminator (just for safety)
1113 * n x Byte ranges within the named RAMBlock
1114 * be64 Start of the range
1117 * name: RAMBlock name that these entries are part of
1118 * len: Number of page entries
1119 * start_list: 'len' addresses
1120 * length_list: 'len' addresses
1123 void qemu_savevm_send_postcopy_ram_discard(QEMUFile
*f
, const char *name
,
1125 uint64_t *start_list
,
1126 uint64_t *length_list
)
1131 size_t name_len
= strlen(name
);
1133 trace_qemu_savevm_send_postcopy_ram_discard(name
, len
);
1134 assert(name_len
< 256);
1135 buf
= g_malloc0(1 + 1 + name_len
+ 1 + (8 + 8) * len
);
1136 buf
[0] = postcopy_ram_discard_version
;
1138 memcpy(buf
+ 2, name
, name_len
);
1139 tmplen
= 2 + name_len
;
1140 buf
[tmplen
++] = '\0';
1142 for (t
= 0; t
< len
; t
++) {
1143 stq_be_p(buf
+ tmplen
, start_list
[t
]);
1145 stq_be_p(buf
+ tmplen
, length_list
[t
]);
1148 qemu_savevm_command_send(f
, MIG_CMD_POSTCOPY_RAM_DISCARD
, tmplen
, buf
);
1152 /* Get the destination into a state where it can receive postcopy data. */
1153 void qemu_savevm_send_postcopy_listen(QEMUFile
*f
)
1155 trace_savevm_send_postcopy_listen();
1156 qemu_savevm_command_send(f
, MIG_CMD_POSTCOPY_LISTEN
, 0, NULL
);
1159 /* Kick the destination into running */
1160 void qemu_savevm_send_postcopy_run(QEMUFile
*f
)
1162 trace_savevm_send_postcopy_run();
1163 qemu_savevm_command_send(f
, MIG_CMD_POSTCOPY_RUN
, 0, NULL
);
1166 void qemu_savevm_send_postcopy_resume(QEMUFile
*f
)
1168 trace_savevm_send_postcopy_resume();
1169 qemu_savevm_command_send(f
, MIG_CMD_POSTCOPY_RESUME
, 0, NULL
);
1172 void qemu_savevm_send_recv_bitmap(QEMUFile
*f
, char *block_name
)
1177 trace_savevm_send_recv_bitmap(block_name
);
1179 buf
[0] = len
= strlen(block_name
);
1180 memcpy(buf
+ 1, block_name
, len
);
1182 qemu_savevm_command_send(f
, MIG_CMD_RECV_BITMAP
, len
+ 1, (uint8_t *)buf
);
1185 bool qemu_savevm_state_blocked(Error
**errp
)
1189 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1190 if (se
->vmsd
&& se
->vmsd
->unmigratable
) {
1191 error_setg(errp
, "State blocked by non-migratable device '%s'",
1199 void qemu_savevm_non_migratable_list(strList
**reasons
)
1203 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1204 if (se
->vmsd
&& se
->vmsd
->unmigratable
) {
1205 QAPI_LIST_PREPEND(*reasons
,
1206 g_strdup_printf("non-migratable device: %s",
1212 void qemu_savevm_state_header(QEMUFile
*f
)
1214 trace_savevm_state_header();
1215 qemu_put_be32(f
, QEMU_VM_FILE_MAGIC
);
1216 qemu_put_be32(f
, QEMU_VM_FILE_VERSION
);
1218 if (migrate_get_current()->send_configuration
) {
1219 qemu_put_byte(f
, QEMU_VM_CONFIGURATION
);
1220 vmstate_save_state(f
, &vmstate_configuration
, &savevm_state
, 0);
1224 bool qemu_savevm_state_guest_unplug_pending(void)
1228 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1229 if (se
->vmsd
&& se
->vmsd
->dev_unplug_pending
&&
1230 se
->vmsd
->dev_unplug_pending(se
->opaque
)) {
1238 void qemu_savevm_state_setup(QEMUFile
*f
)
1240 MigrationState
*ms
= migrate_get_current();
1242 Error
*local_err
= NULL
;
1245 ms
->vmdesc
= json_writer_new(false);
1246 json_writer_start_object(ms
->vmdesc
, NULL
);
1247 json_writer_int64(ms
->vmdesc
, "page_size", qemu_target_page_size());
1248 json_writer_start_array(ms
->vmdesc
, "devices");
1250 trace_savevm_state_setup();
1251 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1252 if (se
->vmsd
&& se
->vmsd
->early_setup
) {
1253 ret
= vmstate_save(f
, se
, ms
->vmdesc
);
1255 qemu_file_set_error(f
, ret
);
1261 if (!se
->ops
|| !se
->ops
->save_setup
) {
1264 if (se
->ops
->is_active
) {
1265 if (!se
->ops
->is_active(se
->opaque
)) {
1269 save_section_header(f
, se
, QEMU_VM_SECTION_START
);
1271 ret
= se
->ops
->save_setup(f
, se
->opaque
);
1272 save_section_footer(f
, se
);
1274 qemu_file_set_error(f
, ret
);
1279 if (precopy_notify(PRECOPY_NOTIFY_SETUP
, &local_err
)) {
1280 error_report_err(local_err
);
1284 int qemu_savevm_state_resume_prepare(MigrationState
*s
)
1289 trace_savevm_state_resume_prepare();
1291 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1292 if (!se
->ops
|| !se
->ops
->resume_prepare
) {
1295 if (se
->ops
->is_active
) {
1296 if (!se
->ops
->is_active(se
->opaque
)) {
1300 ret
= se
->ops
->resume_prepare(s
, se
->opaque
);
1310 * this function has three return values:
1311 * negative: there was one error, and we have -errno.
1312 * 0 : We haven't finished, caller have to go again
1313 * 1 : We have finished, we can go to complete phase
1315 int qemu_savevm_state_iterate(QEMUFile
*f
, bool postcopy
)
1320 trace_savevm_state_iterate();
1321 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1322 if (!se
->ops
|| !se
->ops
->save_live_iterate
) {
1325 if (se
->ops
->is_active
&&
1326 !se
->ops
->is_active(se
->opaque
)) {
1329 if (se
->ops
->is_active_iterate
&&
1330 !se
->ops
->is_active_iterate(se
->opaque
)) {
1334 * In the postcopy phase, any device that doesn't know how to
1335 * do postcopy should have saved it's state in the _complete
1336 * call that's already run, it might get confused if we call
1337 * iterate afterwards.
1340 !(se
->ops
->has_postcopy
&& se
->ops
->has_postcopy(se
->opaque
))) {
1343 if (qemu_file_rate_limit(f
)) {
1346 trace_savevm_section_start(se
->idstr
, se
->section_id
);
1348 save_section_header(f
, se
, QEMU_VM_SECTION_PART
);
1350 ret
= se
->ops
->save_live_iterate(f
, se
->opaque
);
1351 trace_savevm_section_end(se
->idstr
, se
->section_id
, ret
);
1352 save_section_footer(f
, se
);
1355 error_report("failed to save SaveStateEntry with id(name): "
1357 se
->section_id
, se
->idstr
, ret
);
1358 qemu_file_set_error(f
, ret
);
1361 /* Do not proceed to the next vmstate before this one reported
1362 completion of the current stage. This serializes the migration
1363 and reduces the probability that a faster changing state is
1364 synchronized over and over again. */
1371 static bool should_send_vmdesc(void)
1373 MachineState
*machine
= MACHINE(qdev_get_machine());
1374 bool in_postcopy
= migration_in_postcopy();
1375 return !machine
->suppress_vmdesc
&& !in_postcopy
;
1379 * Calls the save_live_complete_postcopy methods
1380 * causing the last few pages to be sent immediately and doing any associated
1382 * Note postcopy also calls qemu_savevm_state_complete_precopy to complete
1383 * all the other devices, but that happens at the point we switch to postcopy.
1385 void qemu_savevm_state_complete_postcopy(QEMUFile
*f
)
1390 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1391 if (!se
->ops
|| !se
->ops
->save_live_complete_postcopy
) {
1394 if (se
->ops
->is_active
) {
1395 if (!se
->ops
->is_active(se
->opaque
)) {
1399 trace_savevm_section_start(se
->idstr
, se
->section_id
);
1401 qemu_put_byte(f
, QEMU_VM_SECTION_END
);
1402 qemu_put_be32(f
, se
->section_id
);
1404 ret
= se
->ops
->save_live_complete_postcopy(f
, se
->opaque
);
1405 trace_savevm_section_end(se
->idstr
, se
->section_id
, ret
);
1406 save_section_footer(f
, se
);
1408 qemu_file_set_error(f
, ret
);
1413 qemu_put_byte(f
, QEMU_VM_EOF
);
1418 int qemu_savevm_state_complete_precopy_iterable(QEMUFile
*f
, bool in_postcopy
)
1423 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1425 (in_postcopy
&& se
->ops
->has_postcopy
&&
1426 se
->ops
->has_postcopy(se
->opaque
)) ||
1427 !se
->ops
->save_live_complete_precopy
) {
1431 if (se
->ops
->is_active
) {
1432 if (!se
->ops
->is_active(se
->opaque
)) {
1436 trace_savevm_section_start(se
->idstr
, se
->section_id
);
1438 save_section_header(f
, se
, QEMU_VM_SECTION_END
);
1440 ret
= se
->ops
->save_live_complete_precopy(f
, se
->opaque
);
1441 trace_savevm_section_end(se
->idstr
, se
->section_id
, ret
);
1442 save_section_footer(f
, se
);
1444 qemu_file_set_error(f
, ret
);
1452 int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile
*f
,
1454 bool inactivate_disks
)
1456 MigrationState
*ms
= migrate_get_current();
1457 JSONWriter
*vmdesc
= ms
->vmdesc
;
1462 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1463 if (se
->vmsd
&& se
->vmsd
->early_setup
) {
1464 /* Already saved during qemu_savevm_state_setup(). */
1468 ret
= vmstate_save(f
, se
, vmdesc
);
1470 qemu_file_set_error(f
, ret
);
1475 if (inactivate_disks
) {
1476 /* Inactivate before sending QEMU_VM_EOF so that the
1477 * bdrv_activate_all() on the other end won't fail. */
1478 ret
= bdrv_inactivate_all();
1480 error_report("%s: bdrv_inactivate_all() failed (%d)",
1482 qemu_file_set_error(f
, ret
);
1487 /* Postcopy stream will still be going */
1488 qemu_put_byte(f
, QEMU_VM_EOF
);
1491 json_writer_end_array(vmdesc
);
1492 json_writer_end_object(vmdesc
);
1493 vmdesc_len
= strlen(json_writer_get(vmdesc
));
1495 if (should_send_vmdesc()) {
1496 qemu_put_byte(f
, QEMU_VM_VMDESCRIPTION
);
1497 qemu_put_be32(f
, vmdesc_len
);
1498 qemu_put_buffer(f
, (uint8_t *)json_writer_get(vmdesc
), vmdesc_len
);
1501 /* Free it now to detect any inconsistencies. */
1502 json_writer_free(vmdesc
);
1508 int qemu_savevm_state_complete_precopy(QEMUFile
*f
, bool iterable_only
,
1509 bool inactivate_disks
)
1512 Error
*local_err
= NULL
;
1513 bool in_postcopy
= migration_in_postcopy();
1515 if (precopy_notify(PRECOPY_NOTIFY_COMPLETE
, &local_err
)) {
1516 error_report_err(local_err
);
1519 trace_savevm_state_complete_precopy();
1521 cpu_synchronize_all_states();
1523 if (!in_postcopy
|| iterable_only
) {
1524 ret
= qemu_savevm_state_complete_precopy_iterable(f
, in_postcopy
);
1530 if (iterable_only
) {
1534 ret
= qemu_savevm_state_complete_precopy_non_iterable(f
, in_postcopy
,
1545 /* Give an estimate of the amount left to be transferred,
1546 * the result is split into the amount for units that can and
1547 * for units that can't do postcopy.
1549 void qemu_savevm_state_pending_estimate(uint64_t *must_precopy
,
1550 uint64_t *can_postcopy
)
1557 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1558 if (!se
->ops
|| !se
->ops
->state_pending_estimate
) {
1561 if (se
->ops
->is_active
) {
1562 if (!se
->ops
->is_active(se
->opaque
)) {
1566 se
->ops
->state_pending_estimate(se
->opaque
, must_precopy
, can_postcopy
);
1570 void qemu_savevm_state_pending_exact(uint64_t *must_precopy
,
1571 uint64_t *can_postcopy
)
1578 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1579 if (!se
->ops
|| !se
->ops
->state_pending_exact
) {
1582 if (se
->ops
->is_active
) {
1583 if (!se
->ops
->is_active(se
->opaque
)) {
1587 se
->ops
->state_pending_exact(se
->opaque
, must_precopy
, can_postcopy
);
1591 void qemu_savevm_state_cleanup(void)
1594 Error
*local_err
= NULL
;
1596 if (precopy_notify(PRECOPY_NOTIFY_CLEANUP
, &local_err
)) {
1597 error_report_err(local_err
);
1600 trace_savevm_state_cleanup();
1601 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1602 if (se
->ops
&& se
->ops
->save_cleanup
) {
1603 se
->ops
->save_cleanup(se
->opaque
);
1608 static int qemu_savevm_state(QEMUFile
*f
, Error
**errp
)
1611 MigrationState
*ms
= migrate_get_current();
1612 MigrationStatus status
;
1614 if (migration_is_running(ms
->state
)) {
1615 error_setg(errp
, QERR_MIGRATION_ACTIVE
);
1619 if (migrate_block()) {
1620 error_setg(errp
, "Block migration and snapshots are incompatible");
1625 memset(&mig_stats
, 0, sizeof(mig_stats
));
1626 memset(&compression_counters
, 0, sizeof(compression_counters
));
1627 ms
->to_dst_file
= f
;
1629 qemu_mutex_unlock_iothread();
1630 qemu_savevm_state_header(f
);
1631 qemu_savevm_state_setup(f
);
1632 qemu_mutex_lock_iothread();
1634 while (qemu_file_get_error(f
) == 0) {
1635 if (qemu_savevm_state_iterate(f
, false) > 0) {
1640 ret
= qemu_file_get_error(f
);
1642 qemu_savevm_state_complete_precopy(f
, false, false);
1643 ret
= qemu_file_get_error(f
);
1645 qemu_savevm_state_cleanup();
1647 error_setg_errno(errp
, -ret
, "Error while writing VM state");
1651 status
= MIGRATION_STATUS_FAILED
;
1653 status
= MIGRATION_STATUS_COMPLETED
;
1655 migrate_set_state(&ms
->state
, MIGRATION_STATUS_SETUP
, status
);
1657 /* f is outer parameter, it should not stay in global migration state after
1658 * this function finished */
1659 ms
->to_dst_file
= NULL
;
1664 void qemu_savevm_live_state(QEMUFile
*f
)
1666 /* save QEMU_VM_SECTION_END section */
1667 qemu_savevm_state_complete_precopy(f
, true, false);
1668 qemu_put_byte(f
, QEMU_VM_EOF
);
1671 int qemu_save_device_state(QEMUFile
*f
)
1675 if (!migration_in_colo_state()) {
1676 qemu_put_be32(f
, QEMU_VM_FILE_MAGIC
);
1677 qemu_put_be32(f
, QEMU_VM_FILE_VERSION
);
1679 cpu_synchronize_all_states();
1681 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1687 ret
= vmstate_save(f
, se
, NULL
);
1693 qemu_put_byte(f
, QEMU_VM_EOF
);
1695 return qemu_file_get_error(f
);
1698 static SaveStateEntry
*find_se(const char *idstr
, uint32_t instance_id
)
1702 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
1703 if (!strcmp(se
->idstr
, idstr
) &&
1704 (instance_id
== se
->instance_id
||
1705 instance_id
== se
->alias_id
))
1707 /* Migrating from an older version? */
1708 if (strstr(se
->idstr
, idstr
) && se
->compat
) {
1709 if (!strcmp(se
->compat
->idstr
, idstr
) &&
1710 (instance_id
== se
->compat
->instance_id
||
1711 instance_id
== se
->alias_id
))
1718 enum LoadVMExitCodes
{
1719 /* Allow a command to quit all layers of nested loadvm loops */
1723 /* ------ incoming postcopy messages ------ */
1724 /* 'advise' arrives before any transfers just to tell us that a postcopy
1725 * *might* happen - it might be skipped if precopy transferred everything
1728 static int loadvm_postcopy_handle_advise(MigrationIncomingState
*mis
,
1731 PostcopyState ps
= postcopy_state_set(POSTCOPY_INCOMING_ADVISE
);
1732 uint64_t remote_pagesize_summary
, local_pagesize_summary
, remote_tps
;
1733 size_t page_size
= qemu_target_page_size();
1734 Error
*local_err
= NULL
;
1736 trace_loadvm_postcopy_handle_advise();
1737 if (ps
!= POSTCOPY_INCOMING_NONE
) {
1738 error_report("CMD_POSTCOPY_ADVISE in wrong postcopy state (%d)", ps
);
1744 if (migrate_postcopy_ram()) {
1745 error_report("RAM postcopy is enabled but have 0 byte advise");
1750 if (!migrate_postcopy_ram()) {
1751 error_report("RAM postcopy is disabled but have 16 byte advise");
1756 error_report("CMD_POSTCOPY_ADVISE invalid length (%d)", len
);
1760 if (!postcopy_ram_supported_by_host(mis
, &local_err
)) {
1761 error_report_err(local_err
);
1762 postcopy_state_set(POSTCOPY_INCOMING_NONE
);
1766 remote_pagesize_summary
= qemu_get_be64(mis
->from_src_file
);
1767 local_pagesize_summary
= ram_pagesize_summary();
1769 if (remote_pagesize_summary
!= local_pagesize_summary
) {
1771 * This detects two potential causes of mismatch:
1772 * a) A mismatch in host page sizes
1773 * Some combinations of mismatch are probably possible but it gets
1774 * a bit more complicated. In particular we need to place whole
1775 * host pages on the dest at once, and we need to ensure that we
1776 * handle dirtying to make sure we never end up sending part of
1777 * a hostpage on it's own.
1778 * b) The use of different huge page sizes on source/destination
1779 * a more fine grain test is performed during RAM block migration
1780 * but this test here causes a nice early clear failure, and
1781 * also fails when passed to an older qemu that doesn't
1784 error_report("Postcopy needs matching RAM page sizes (s=%" PRIx64
1786 remote_pagesize_summary
, local_pagesize_summary
);
1790 remote_tps
= qemu_get_be64(mis
->from_src_file
);
1791 if (remote_tps
!= page_size
) {
1793 * Again, some differences could be dealt with, but for now keep it
1796 error_report("Postcopy needs matching target page sizes (s=%d d=%zd)",
1797 (int)remote_tps
, page_size
);
1801 if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_ADVISE
, &local_err
)) {
1802 error_report_err(local_err
);
1806 if (ram_postcopy_incoming_init(mis
)) {
1813 /* After postcopy we will be told to throw some pages away since they're
1814 * dirty and will have to be demand fetched. Must happen before CPU is
1816 * There can be 0..many of these messages, each encoding multiple pages.
1818 static int loadvm_postcopy_ram_handle_discard(MigrationIncomingState
*mis
,
1823 PostcopyState ps
= postcopy_state_get();
1825 trace_loadvm_postcopy_ram_handle_discard();
1828 case POSTCOPY_INCOMING_ADVISE
:
1830 tmp
= postcopy_ram_prepare_discard(mis
);
1836 case POSTCOPY_INCOMING_DISCARD
:
1837 /* Expected state */
1841 error_report("CMD_POSTCOPY_RAM_DISCARD in wrong postcopy state (%d)",
1845 /* We're expecting a
1847 * a RAM ID string (length byte, name, 0 term)
1848 * then at least 1 16 byte chunk
1850 if (len
< (1 + 1 + 1 + 1 + 2 * 8)) {
1851 error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len
);
1855 tmp
= qemu_get_byte(mis
->from_src_file
);
1856 if (tmp
!= postcopy_ram_discard_version
) {
1857 error_report("CMD_POSTCOPY_RAM_DISCARD invalid version (%d)", tmp
);
1861 if (!qemu_get_counted_string(mis
->from_src_file
, ramid
)) {
1862 error_report("CMD_POSTCOPY_RAM_DISCARD Failed to read RAMBlock ID");
1865 tmp
= qemu_get_byte(mis
->from_src_file
);
1867 error_report("CMD_POSTCOPY_RAM_DISCARD missing nil (%d)", tmp
);
1871 len
-= 3 + strlen(ramid
);
1873 error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len
);
1876 trace_loadvm_postcopy_ram_handle_discard_header(ramid
, len
);
1878 uint64_t start_addr
, block_length
;
1879 start_addr
= qemu_get_be64(mis
->from_src_file
);
1880 block_length
= qemu_get_be64(mis
->from_src_file
);
1883 int ret
= ram_discard_range(ramid
, start_addr
, block_length
);
1888 trace_loadvm_postcopy_ram_handle_discard_end();
1894 * Triggered by a postcopy_listen command; this thread takes over reading
1895 * the input stream, leaving the main thread free to carry on loading the rest
1896 * of the device state (from RAM).
1897 * (TODO:This could do with being in a postcopy file - but there again it's
1898 * just another input loop, not that postcopy specific)
1900 static void *postcopy_ram_listen_thread(void *opaque
)
1902 MigrationIncomingState
*mis
= migration_incoming_get_current();
1903 QEMUFile
*f
= mis
->from_src_file
;
1905 MigrationState
*migr
= migrate_get_current();
1907 object_ref(OBJECT(migr
));
1909 migrate_set_state(&mis
->state
, MIGRATION_STATUS_ACTIVE
,
1910 MIGRATION_STATUS_POSTCOPY_ACTIVE
);
1911 qemu_sem_post(&mis
->thread_sync_sem
);
1912 trace_postcopy_ram_listen_thread_start();
1914 rcu_register_thread();
1916 * Because we're a thread and not a coroutine we can't yield
1917 * in qemu_file, and thus we must be blocking now.
1919 qemu_file_set_blocking(f
, true);
1920 load_res
= qemu_loadvm_state_main(f
, mis
);
1923 * This is tricky, but, mis->from_src_file can change after it
1924 * returns, when postcopy recovery happened. In the future, we may
1925 * want a wrapper for the QEMUFile handle.
1927 f
= mis
->from_src_file
;
1929 /* And non-blocking again so we don't block in any cleanup */
1930 qemu_file_set_blocking(f
, false);
1932 trace_postcopy_ram_listen_thread_exit();
1934 qemu_file_set_error(f
, load_res
);
1935 dirty_bitmap_mig_cancel_incoming();
1936 if (postcopy_state_get() == POSTCOPY_INCOMING_RUNNING
&&
1937 !migrate_postcopy_ram() && migrate_dirty_bitmaps())
1939 error_report("%s: loadvm failed during postcopy: %d. All states "
1940 "are migrated except dirty bitmaps. Some dirty "
1941 "bitmaps may be lost, and present migrated dirty "
1942 "bitmaps are correctly migrated and valid.",
1943 __func__
, load_res
);
1944 load_res
= 0; /* prevent further exit() */
1946 error_report("%s: loadvm failed: %d", __func__
, load_res
);
1947 migrate_set_state(&mis
->state
, MIGRATION_STATUS_POSTCOPY_ACTIVE
,
1948 MIGRATION_STATUS_FAILED
);
1951 if (load_res
>= 0) {
1953 * This looks good, but it's possible that the device loading in the
1954 * main thread hasn't finished yet, and so we might not be in 'RUN'
1955 * state yet; wait for the end of the main thread.
1957 qemu_event_wait(&mis
->main_thread_load_event
);
1959 postcopy_ram_incoming_cleanup(mis
);
1963 * If something went wrong then we have a bad state so exit;
1964 * depending how far we got it might be possible at this point
1965 * to leave the guest running and fire MCEs for pages that never
1966 * arrived as a desperate recovery step.
1968 rcu_unregister_thread();
1972 migrate_set_state(&mis
->state
, MIGRATION_STATUS_POSTCOPY_ACTIVE
,
1973 MIGRATION_STATUS_COMPLETED
);
1975 * If everything has worked fine, then the main thread has waited
1976 * for us to start, and we're the last use of the mis.
1977 * (If something broke then qemu will have to exit anyway since it's
1978 * got a bad migration state).
1980 migration_incoming_state_destroy();
1981 qemu_loadvm_state_cleanup();
1983 rcu_unregister_thread();
1984 mis
->have_listen_thread
= false;
1985 postcopy_state_set(POSTCOPY_INCOMING_END
);
1987 object_unref(OBJECT(migr
));
1992 /* After this message we must be able to immediately receive postcopy data */
1993 static int loadvm_postcopy_handle_listen(MigrationIncomingState
*mis
)
1995 PostcopyState ps
= postcopy_state_set(POSTCOPY_INCOMING_LISTENING
);
1996 Error
*local_err
= NULL
;
1998 trace_loadvm_postcopy_handle_listen("enter");
2000 if (ps
!= POSTCOPY_INCOMING_ADVISE
&& ps
!= POSTCOPY_INCOMING_DISCARD
) {
2001 error_report("CMD_POSTCOPY_LISTEN in wrong postcopy state (%d)", ps
);
2004 if (ps
== POSTCOPY_INCOMING_ADVISE
) {
2006 * A rare case, we entered listen without having to do any discards,
2007 * so do the setup that's normally done at the time of the 1st discard.
2009 if (migrate_postcopy_ram()) {
2010 postcopy_ram_prepare_discard(mis
);
2014 trace_loadvm_postcopy_handle_listen("after discard");
2017 * Sensitise RAM - can now generate requests for blocks that don't exist
2018 * However, at this point the CPU shouldn't be running, and the IO
2019 * shouldn't be doing anything yet so don't actually expect requests
2021 if (migrate_postcopy_ram()) {
2022 if (postcopy_ram_incoming_setup(mis
)) {
2023 postcopy_ram_incoming_cleanup(mis
);
2028 trace_loadvm_postcopy_handle_listen("after uffd");
2030 if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_LISTEN
, &local_err
)) {
2031 error_report_err(local_err
);
2035 mis
->have_listen_thread
= true;
2036 postcopy_thread_create(mis
, &mis
->listen_thread
, "postcopy/listen",
2037 postcopy_ram_listen_thread
, QEMU_THREAD_DETACHED
);
2038 trace_loadvm_postcopy_handle_listen("return");
2043 static void loadvm_postcopy_handle_run_bh(void *opaque
)
2045 Error
*local_err
= NULL
;
2046 MigrationIncomingState
*mis
= opaque
;
2048 trace_loadvm_postcopy_handle_run_bh("enter");
2050 /* TODO we should move all of this lot into postcopy_ram.c or a shared code
2053 cpu_synchronize_all_post_init();
2055 trace_loadvm_postcopy_handle_run_bh("after cpu sync");
2057 qemu_announce_self(&mis
->announce_timer
, migrate_announce_params());
2059 trace_loadvm_postcopy_handle_run_bh("after announce");
2061 /* Make sure all file formats throw away their mutable metadata.
2062 * If we get an error here, just don't restart the VM yet. */
2063 bdrv_activate_all(&local_err
);
2065 error_report_err(local_err
);
2070 trace_loadvm_postcopy_handle_run_bh("after invalidate cache");
2072 dirty_bitmap_mig_before_vm_start();
2075 /* Hold onto your hats, starting the CPU */
2078 /* leave it paused and let management decide when to start the CPU */
2079 runstate_set(RUN_STATE_PAUSED
);
2082 qemu_bh_delete(mis
->bh
);
2084 trace_loadvm_postcopy_handle_run_bh("return");
2087 /* After all discards we can start running and asking for pages */
2088 static int loadvm_postcopy_handle_run(MigrationIncomingState
*mis
)
2090 PostcopyState ps
= postcopy_state_get();
2092 trace_loadvm_postcopy_handle_run();
2093 if (ps
!= POSTCOPY_INCOMING_LISTENING
) {
2094 error_report("CMD_POSTCOPY_RUN in wrong postcopy state (%d)", ps
);
2098 postcopy_state_set(POSTCOPY_INCOMING_RUNNING
);
2099 mis
->bh
= qemu_bh_new(loadvm_postcopy_handle_run_bh
, mis
);
2100 qemu_bh_schedule(mis
->bh
);
2102 /* We need to finish reading the stream from the package
2103 * and also stop reading anything more from the stream that loaded the
2104 * package (since it's now being read by the listener thread).
2105 * LOADVM_QUIT will quit all the layers of nested loadvm loops.
2110 /* We must be with page_request_mutex held */
2111 static gboolean
postcopy_sync_page_req(gpointer key
, gpointer value
,
2114 MigrationIncomingState
*mis
= data
;
2115 void *host_addr
= (void *) key
;
2116 ram_addr_t rb_offset
;
2120 rb
= qemu_ram_block_from_host(host_addr
, true, &rb_offset
);
2123 * This should _never_ happen. However be nice for a migrating VM to
2124 * not crash/assert. Post an error (note: intended to not use *_once
2125 * because we do want to see all the illegal addresses; and this can
2126 * never be triggered by the guest so we're safe) and move on next.
2128 error_report("%s: illegal host addr %p", __func__
, host_addr
);
2129 /* Try the next entry */
2133 ret
= migrate_send_rp_message_req_pages(mis
, rb
, rb_offset
);
2135 /* Please refer to above comment. */
2136 error_report("%s: send rp message failed for addr %p",
2137 __func__
, host_addr
);
2141 trace_postcopy_page_req_sync(host_addr
);
2146 static void migrate_send_rp_req_pages_pending(MigrationIncomingState
*mis
)
2148 WITH_QEMU_LOCK_GUARD(&mis
->page_request_mutex
) {
2149 g_tree_foreach(mis
->page_requested
, postcopy_sync_page_req
, mis
);
2153 static int loadvm_postcopy_handle_resume(MigrationIncomingState
*mis
)
2155 if (mis
->state
!= MIGRATION_STATUS_POSTCOPY_RECOVER
) {
2156 error_report("%s: illegal resume received", __func__
);
2157 /* Don't fail the load, only for this. */
2162 * Reset the last_rb before we resend any page req to source again, since
2163 * the source should have it reset already.
2165 mis
->last_rb
= NULL
;
2168 * This means source VM is ready to resume the postcopy migration.
2170 migrate_set_state(&mis
->state
, MIGRATION_STATUS_POSTCOPY_RECOVER
,
2171 MIGRATION_STATUS_POSTCOPY_ACTIVE
);
2173 trace_loadvm_postcopy_handle_resume();
2175 /* Tell source that "we are ready" */
2176 migrate_send_rp_resume_ack(mis
, MIGRATION_RESUME_ACK_VALUE
);
2179 * After a postcopy recovery, the source should have lost the postcopy
2180 * queue, or potentially the requested pages could have been lost during
2181 * the network down phase. Let's re-sync with the source VM by re-sending
2182 * all the pending pages that we eagerly need, so these threads won't get
2183 * blocked too long due to the recovery.
2185 * Without this procedure, the faulted destination VM threads (waiting for
2186 * page requests right before the postcopy is interrupted) can keep hanging
2187 * until the pages are sent by the source during the background copying of
2188 * pages, or another thread faulted on the same address accidentally.
2190 migrate_send_rp_req_pages_pending(mis
);
2193 * It's time to switch state and release the fault thread to continue
2194 * service page faults. Note that this should be explicitly after the
2195 * above call to migrate_send_rp_req_pages_pending(). In short:
2196 * migrate_send_rp_message_req_pages() is not thread safe, yet.
2198 qemu_sem_post(&mis
->postcopy_pause_sem_fault
);
2200 if (migrate_postcopy_preempt()) {
2202 * The preempt channel will be created in async manner, now let's
2203 * wait for it and make sure it's created.
2205 qemu_sem_wait(&mis
->postcopy_qemufile_dst_done
);
2206 assert(mis
->postcopy_qemufile_dst
);
2207 /* Kick the fast ram load thread too */
2208 qemu_sem_post(&mis
->postcopy_pause_sem_fast_load
);
2215 * Immediately following this command is a blob of data containing an embedded
2216 * chunk of migration stream; read it and load it.
2218 * @mis: Incoming state
2219 * @length: Length of packaged data to read
2221 * Returns: Negative values on error
2224 static int loadvm_handle_cmd_packaged(MigrationIncomingState
*mis
)
2228 QIOChannelBuffer
*bioc
;
2230 length
= qemu_get_be32(mis
->from_src_file
);
2231 trace_loadvm_handle_cmd_packaged(length
);
2233 if (length
> MAX_VM_CMD_PACKAGED_SIZE
) {
2234 error_report("Unreasonably large packaged state: %zu", length
);
2238 bioc
= qio_channel_buffer_new(length
);
2239 qio_channel_set_name(QIO_CHANNEL(bioc
), "migration-loadvm-buffer");
2240 ret
= qemu_get_buffer(mis
->from_src_file
,
2243 if (ret
!= length
) {
2244 object_unref(OBJECT(bioc
));
2245 error_report("CMD_PACKAGED: Buffer receive fail ret=%d length=%zu",
2247 return (ret
< 0) ? ret
: -EAGAIN
;
2249 bioc
->usage
+= length
;
2250 trace_loadvm_handle_cmd_packaged_received(ret
);
2252 QEMUFile
*packf
= qemu_file_new_input(QIO_CHANNEL(bioc
));
2254 ret
= qemu_loadvm_state_main(packf
, mis
);
2255 trace_loadvm_handle_cmd_packaged_main(ret
);
2257 object_unref(OBJECT(bioc
));
2263 * Handle request that source requests for recved_bitmap on
2264 * destination. Payload format:
2266 * len (1 byte) + ramblock_name (<255 bytes)
2268 static int loadvm_handle_recv_bitmap(MigrationIncomingState
*mis
,
2271 QEMUFile
*file
= mis
->from_src_file
;
2273 char block_name
[256];
2276 cnt
= qemu_get_counted_string(file
, block_name
);
2278 error_report("%s: failed to read block name", __func__
);
2282 /* Validate before using the data */
2283 if (qemu_file_get_error(file
)) {
2284 return qemu_file_get_error(file
);
2287 if (len
!= cnt
+ 1) {
2288 error_report("%s: invalid payload length (%d)", __func__
, len
);
2292 rb
= qemu_ram_block_by_name(block_name
);
2294 error_report("%s: block '%s' not found", __func__
, block_name
);
2298 migrate_send_rp_recv_bitmap(mis
, block_name
);
2300 trace_loadvm_handle_recv_bitmap(block_name
);
2305 static int loadvm_process_enable_colo(MigrationIncomingState
*mis
)
2307 int ret
= migration_incoming_enable_colo();
2310 ret
= colo_init_ram_cache();
2312 migration_incoming_disable_colo();
2319 * Process an incoming 'QEMU_VM_COMMAND'
2320 * 0 just a normal return
2321 * LOADVM_QUIT All good, but exit the loop
2324 static int loadvm_process_command(QEMUFile
*f
)
2326 MigrationIncomingState
*mis
= migration_incoming_get_current();
2331 cmd
= qemu_get_be16(f
);
2332 len
= qemu_get_be16(f
);
2334 /* Check validity before continue processing of cmds */
2335 if (qemu_file_get_error(f
)) {
2336 return qemu_file_get_error(f
);
2339 if (cmd
>= MIG_CMD_MAX
|| cmd
== MIG_CMD_INVALID
) {
2340 error_report("MIG_CMD 0x%x unknown (len 0x%x)", cmd
, len
);
2344 trace_loadvm_process_command(mig_cmd_args
[cmd
].name
, len
);
2346 if (mig_cmd_args
[cmd
].len
!= -1 && mig_cmd_args
[cmd
].len
!= len
) {
2347 error_report("%s received with bad length - expecting %zu, got %d",
2348 mig_cmd_args
[cmd
].name
,
2349 (size_t)mig_cmd_args
[cmd
].len
, len
);
2354 case MIG_CMD_OPEN_RETURN_PATH
:
2355 if (mis
->to_src_file
) {
2356 error_report("CMD_OPEN_RETURN_PATH called when RP already open");
2357 /* Not really a problem, so don't give up */
2360 mis
->to_src_file
= qemu_file_get_return_path(f
);
2361 if (!mis
->to_src_file
) {
2362 error_report("CMD_OPEN_RETURN_PATH failed");
2368 tmp32
= qemu_get_be32(f
);
2369 trace_loadvm_process_command_ping(tmp32
);
2370 if (!mis
->to_src_file
) {
2371 error_report("CMD_PING (0x%x) received with no return path",
2375 migrate_send_rp_pong(mis
, tmp32
);
2378 case MIG_CMD_PACKAGED
:
2379 return loadvm_handle_cmd_packaged(mis
);
2381 case MIG_CMD_POSTCOPY_ADVISE
:
2382 return loadvm_postcopy_handle_advise(mis
, len
);
2384 case MIG_CMD_POSTCOPY_LISTEN
:
2385 return loadvm_postcopy_handle_listen(mis
);
2387 case MIG_CMD_POSTCOPY_RUN
:
2388 return loadvm_postcopy_handle_run(mis
);
2390 case MIG_CMD_POSTCOPY_RAM_DISCARD
:
2391 return loadvm_postcopy_ram_handle_discard(mis
, len
);
2393 case MIG_CMD_POSTCOPY_RESUME
:
2394 return loadvm_postcopy_handle_resume(mis
);
2396 case MIG_CMD_RECV_BITMAP
:
2397 return loadvm_handle_recv_bitmap(mis
, len
);
2399 case MIG_CMD_ENABLE_COLO
:
2400 return loadvm_process_enable_colo(mis
);
2407 * Read a footer off the wire and check that it matches the expected section
2409 * Returns: true if the footer was good
2410 * false if there is a problem (and calls error_report to say why)
2412 static bool check_section_footer(QEMUFile
*f
, SaveStateEntry
*se
)
2416 uint32_t read_section_id
;
2418 if (!migrate_get_current()->send_section_footer
) {
2419 /* No footer to check */
2423 read_mark
= qemu_get_byte(f
);
2425 ret
= qemu_file_get_error(f
);
2427 error_report("%s: Read section footer failed: %d",
2432 if (read_mark
!= QEMU_VM_SECTION_FOOTER
) {
2433 error_report("Missing section footer for %s", se
->idstr
);
2437 read_section_id
= qemu_get_be32(f
);
2438 if (read_section_id
!= se
->load_section_id
) {
2439 error_report("Mismatched section id in footer for %s -"
2440 " read 0x%x expected 0x%x",
2441 se
->idstr
, read_section_id
, se
->load_section_id
);
2450 qemu_loadvm_section_start_full(QEMUFile
*f
, MigrationIncomingState
*mis
)
2452 uint32_t instance_id
, version_id
, section_id
;
2457 /* Read section start */
2458 section_id
= qemu_get_be32(f
);
2459 if (!qemu_get_counted_string(f
, idstr
)) {
2460 error_report("Unable to read ID string for section %u",
2464 instance_id
= qemu_get_be32(f
);
2465 version_id
= qemu_get_be32(f
);
2467 ret
= qemu_file_get_error(f
);
2469 error_report("%s: Failed to read instance/version ID: %d",
2474 trace_qemu_loadvm_state_section_startfull(section_id
, idstr
,
2475 instance_id
, version_id
);
2476 /* Find savevm section */
2477 se
= find_se(idstr
, instance_id
);
2479 error_report("Unknown savevm section or instance '%s' %"PRIu32
". "
2480 "Make sure that your current VM setup matches your "
2481 "saved VM setup, including any hotplugged devices",
2482 idstr
, instance_id
);
2486 /* Validate version */
2487 if (version_id
> se
->version_id
) {
2488 error_report("savevm: unsupported version %d for '%s' v%d",
2489 version_id
, idstr
, se
->version_id
);
2492 se
->load_version_id
= version_id
;
2493 se
->load_section_id
= section_id
;
2495 /* Validate if it is a device's state */
2496 if (xen_enabled() && se
->is_ram
) {
2497 error_report("loadvm: %s RAM loading not allowed on Xen", idstr
);
2501 ret
= vmstate_load(f
, se
);
2503 error_report("error while loading state for instance 0x%"PRIx32
" of"
2504 " device '%s'", instance_id
, idstr
);
2507 if (!check_section_footer(f
, se
)) {
2515 qemu_loadvm_section_part_end(QEMUFile
*f
, MigrationIncomingState
*mis
)
2517 uint32_t section_id
;
2521 section_id
= qemu_get_be32(f
);
2523 ret
= qemu_file_get_error(f
);
2525 error_report("%s: Failed to read section ID: %d",
2530 trace_qemu_loadvm_state_section_partend(section_id
);
2531 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
2532 if (se
->load_section_id
== section_id
) {
2537 error_report("Unknown savevm section %d", section_id
);
2541 ret
= vmstate_load(f
, se
);
2543 error_report("error while loading state section id %d(%s)",
2544 section_id
, se
->idstr
);
2547 if (!check_section_footer(f
, se
)) {
2554 static int qemu_loadvm_state_header(QEMUFile
*f
)
2559 v
= qemu_get_be32(f
);
2560 if (v
!= QEMU_VM_FILE_MAGIC
) {
2561 error_report("Not a migration stream");
2565 v
= qemu_get_be32(f
);
2566 if (v
== QEMU_VM_FILE_VERSION_COMPAT
) {
2567 error_report("SaveVM v2 format is obsolete and don't work anymore");
2570 if (v
!= QEMU_VM_FILE_VERSION
) {
2571 error_report("Unsupported migration stream version");
2575 if (migrate_get_current()->send_configuration
) {
2576 if (qemu_get_byte(f
) != QEMU_VM_CONFIGURATION
) {
2577 error_report("Configuration section missing");
2578 qemu_loadvm_state_cleanup();
2581 ret
= vmstate_load_state(f
, &vmstate_configuration
, &savevm_state
, 0);
2584 qemu_loadvm_state_cleanup();
2591 static int qemu_loadvm_state_setup(QEMUFile
*f
)
2596 trace_loadvm_state_setup();
2597 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
2598 if (!se
->ops
|| !se
->ops
->load_setup
) {
2601 if (se
->ops
->is_active
) {
2602 if (!se
->ops
->is_active(se
->opaque
)) {
2607 ret
= se
->ops
->load_setup(f
, se
->opaque
);
2609 qemu_file_set_error(f
, ret
);
2610 error_report("Load state of device %s failed", se
->idstr
);
2617 void qemu_loadvm_state_cleanup(void)
2621 trace_loadvm_state_cleanup();
2622 QTAILQ_FOREACH(se
, &savevm_state
.handlers
, entry
) {
2623 if (se
->ops
&& se
->ops
->load_cleanup
) {
2624 se
->ops
->load_cleanup(se
->opaque
);
2629 /* Return true if we should continue the migration, or false. */
2630 static bool postcopy_pause_incoming(MigrationIncomingState
*mis
)
2634 trace_postcopy_pause_incoming();
2636 assert(migrate_postcopy_ram());
2639 * Unregister yank with either from/to src would work, since ioc behind it
2642 migration_ioc_unregister_yank_from_file(mis
->from_src_file
);
2644 assert(mis
->from_src_file
);
2645 qemu_file_shutdown(mis
->from_src_file
);
2646 qemu_fclose(mis
->from_src_file
);
2647 mis
->from_src_file
= NULL
;
2649 assert(mis
->to_src_file
);
2650 qemu_file_shutdown(mis
->to_src_file
);
2651 qemu_mutex_lock(&mis
->rp_mutex
);
2652 qemu_fclose(mis
->to_src_file
);
2653 mis
->to_src_file
= NULL
;
2654 qemu_mutex_unlock(&mis
->rp_mutex
);
2657 * NOTE: this must happen before reset the PostcopyTmpPages below,
2658 * otherwise it's racy to reset those fields when the fast load thread
2659 * can be accessing it in parallel.
2661 if (mis
->postcopy_qemufile_dst
) {
2662 qemu_file_shutdown(mis
->postcopy_qemufile_dst
);
2663 /* Take the mutex to make sure the fast ram load thread halted */
2664 qemu_mutex_lock(&mis
->postcopy_prio_thread_mutex
);
2665 migration_ioc_unregister_yank_from_file(mis
->postcopy_qemufile_dst
);
2666 qemu_fclose(mis
->postcopy_qemufile_dst
);
2667 mis
->postcopy_qemufile_dst
= NULL
;
2668 qemu_mutex_unlock(&mis
->postcopy_prio_thread_mutex
);
2671 migrate_set_state(&mis
->state
, MIGRATION_STATUS_POSTCOPY_ACTIVE
,
2672 MIGRATION_STATUS_POSTCOPY_PAUSED
);
2674 /* Notify the fault thread for the invalidated file handle */
2675 postcopy_fault_thread_notify(mis
);
2678 * If network is interrupted, any temp page we received will be useless
2679 * because we didn't mark them as "received" in receivedmap. After a
2680 * proper recovery later (which will sync src dirty bitmap with receivedmap
2681 * on dest) these cached small pages will be resent again.
2683 for (i
= 0; i
< mis
->postcopy_channels
; i
++) {
2684 postcopy_temp_page_reset(&mis
->postcopy_tmp_pages
[i
]);
2687 error_report("Detected IO failure for postcopy. "
2688 "Migration paused.");
2690 while (mis
->state
== MIGRATION_STATUS_POSTCOPY_PAUSED
) {
2691 qemu_sem_wait(&mis
->postcopy_pause_sem_dst
);
2694 trace_postcopy_pause_incoming_continued();
2699 int qemu_loadvm_state_main(QEMUFile
*f
, MigrationIncomingState
*mis
)
2701 uint8_t section_type
;
2706 section_type
= qemu_get_byte(f
);
2708 ret
= qemu_file_get_error_obj_any(f
, mis
->postcopy_qemufile_dst
, NULL
);
2713 trace_qemu_loadvm_state_section(section_type
);
2714 switch (section_type
) {
2715 case QEMU_VM_SECTION_START
:
2716 case QEMU_VM_SECTION_FULL
:
2717 ret
= qemu_loadvm_section_start_full(f
, mis
);
2722 case QEMU_VM_SECTION_PART
:
2723 case QEMU_VM_SECTION_END
:
2724 ret
= qemu_loadvm_section_part_end(f
, mis
);
2729 case QEMU_VM_COMMAND
:
2730 ret
= loadvm_process_command(f
);
2731 trace_qemu_loadvm_state_section_command(ret
);
2732 if ((ret
< 0) || (ret
== LOADVM_QUIT
)) {
2737 /* This is the end of migration */
2740 error_report("Unknown savevm section type %d", section_type
);
2748 qemu_file_set_error(f
, ret
);
2750 /* Cancel bitmaps incoming regardless of recovery */
2751 dirty_bitmap_mig_cancel_incoming();
2754 * If we are during an active postcopy, then we pause instead
2755 * of bail out to at least keep the VM's dirty data. Note
2756 * that POSTCOPY_INCOMING_LISTENING stage is still not enough,
2757 * during which we're still receiving device states and we
2758 * still haven't yet started the VM on destination.
2760 * Only RAM postcopy supports recovery. Still, if RAM postcopy is
2761 * enabled, canceled bitmaps postcopy will not affect RAM postcopy
2764 if (postcopy_state_get() == POSTCOPY_INCOMING_RUNNING
&&
2765 migrate_postcopy_ram() && postcopy_pause_incoming(mis
)) {
2766 /* Reset f to point to the newly created channel */
2767 f
= mis
->from_src_file
;
2774 int qemu_loadvm_state(QEMUFile
*f
)
2776 MigrationIncomingState
*mis
= migration_incoming_get_current();
2777 Error
*local_err
= NULL
;
2780 if (qemu_savevm_state_blocked(&local_err
)) {
2781 error_report_err(local_err
);
2785 ret
= qemu_loadvm_state_header(f
);
2790 if (qemu_loadvm_state_setup(f
) != 0) {
2794 cpu_synchronize_all_pre_loadvm();
2796 ret
= qemu_loadvm_state_main(f
, mis
);
2797 qemu_event_set(&mis
->main_thread_load_event
);
2799 trace_qemu_loadvm_state_post_main(ret
);
2801 if (mis
->have_listen_thread
) {
2802 /* Listen thread still going, can't clean up yet */
2807 ret
= qemu_file_get_error(f
);
2811 * Try to read in the VMDESC section as well, so that dumping tools that
2812 * intercept our migration stream have the chance to see it.
2815 /* We've got to be careful; if we don't read the data and just shut the fd
2816 * then the sender can error if we close while it's still sending.
2817 * We also mustn't read data that isn't there; some transports (RDMA)
2818 * will stall waiting for that data when the source has already closed.
2820 if (ret
== 0 && should_send_vmdesc()) {
2823 uint8_t section_type
= qemu_get_byte(f
);
2825 if (section_type
!= QEMU_VM_VMDESCRIPTION
) {
2826 error_report("Expected vmdescription section, but got %d",
2829 * It doesn't seem worth failing at this point since
2830 * we apparently have an otherwise valid VM state
2833 buf
= g_malloc(0x1000);
2834 size
= qemu_get_be32(f
);
2837 uint32_t read_chunk
= MIN(size
, 0x1000);
2838 qemu_get_buffer(f
, buf
, read_chunk
);
2845 qemu_loadvm_state_cleanup();
2846 cpu_synchronize_all_post_init();
2851 int qemu_load_device_state(QEMUFile
*f
)
2853 MigrationIncomingState
*mis
= migration_incoming_get_current();
2856 /* Load QEMU_VM_SECTION_FULL section */
2857 ret
= qemu_loadvm_state_main(f
, mis
);
2859 error_report("Failed to load device state: %d", ret
);
2863 cpu_synchronize_all_post_init();
2867 bool save_snapshot(const char *name
, bool overwrite
, const char *vmstate
,
2868 bool has_devices
, strList
*devices
, Error
**errp
)
2870 BlockDriverState
*bs
;
2871 QEMUSnapshotInfo sn1
, *sn
= &sn1
;
2874 int saved_vm_running
;
2875 uint64_t vm_state_size
;
2876 g_autoptr(GDateTime
) now
= g_date_time_new_now_local();
2877 AioContext
*aio_context
;
2879 GLOBAL_STATE_CODE();
2881 if (migration_is_blocked(errp
)) {
2885 if (!replay_can_snapshot()) {
2886 error_setg(errp
, "Record/replay does not allow making snapshot "
2887 "right now. Try once more later.");
2891 if (!bdrv_all_can_snapshot(has_devices
, devices
, errp
)) {
2895 /* Delete old snapshots of the same name */
2898 if (bdrv_all_delete_snapshot(name
, has_devices
,
2899 devices
, errp
) < 0) {
2903 ret2
= bdrv_all_has_snapshot(name
, has_devices
, devices
, errp
);
2909 "Snapshot '%s' already exists in one or more devices",
2916 bs
= bdrv_all_find_vmstate_bs(vmstate
, has_devices
, devices
, errp
);
2920 aio_context
= bdrv_get_aio_context(bs
);
2922 saved_vm_running
= runstate_is_running();
2924 ret
= global_state_store();
2926 error_setg(errp
, "Error saving global state");
2929 vm_stop(RUN_STATE_SAVE_VM
);
2931 bdrv_drain_all_begin();
2933 aio_context_acquire(aio_context
);
2935 memset(sn
, 0, sizeof(*sn
));
2937 /* fill auxiliary fields */
2938 sn
->date_sec
= g_date_time_to_unix(now
);
2939 sn
->date_nsec
= g_date_time_get_microsecond(now
) * 1000;
2940 sn
->vm_clock_nsec
= qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
);
2941 if (replay_mode
!= REPLAY_MODE_NONE
) {
2942 sn
->icount
= replay_get_current_icount();
2948 pstrcpy(sn
->name
, sizeof(sn
->name
), name
);
2950 g_autofree
char *autoname
= g_date_time_format(now
, "vm-%Y%m%d%H%M%S");
2951 pstrcpy(sn
->name
, sizeof(sn
->name
), autoname
);
2954 /* save the VM state */
2955 f
= qemu_fopen_bdrv(bs
, 1);
2957 error_setg(errp
, "Could not open VM state file");
2960 ret
= qemu_savevm_state(f
, errp
);
2961 vm_state_size
= qemu_file_total_transferred(f
);
2962 ret2
= qemu_fclose(f
);
2971 /* The bdrv_all_create_snapshot() call that follows acquires the AioContext
2972 * for itself. BDRV_POLL_WHILE() does not support nested locking because
2973 * it only releases the lock once. Therefore synchronous I/O will deadlock
2974 * unless we release the AioContext before bdrv_all_create_snapshot().
2976 aio_context_release(aio_context
);
2979 ret
= bdrv_all_create_snapshot(sn
, bs
, vm_state_size
,
2980 has_devices
, devices
, errp
);
2982 bdrv_all_delete_snapshot(sn
->name
, has_devices
, devices
, NULL
);
2990 aio_context_release(aio_context
);
2993 bdrv_drain_all_end();
2995 if (saved_vm_running
) {
3001 void qmp_xen_save_devices_state(const char *filename
, bool has_live
, bool live
,
3005 QIOChannelFile
*ioc
;
3006 int saved_vm_running
;
3010 /* live default to true so old version of Xen tool stack can have a
3011 * successful live migration */
3015 saved_vm_running
= runstate_is_running();
3016 vm_stop(RUN_STATE_SAVE_VM
);
3017 global_state_store_running();
3019 ioc
= qio_channel_file_new_path(filename
, O_WRONLY
| O_CREAT
| O_TRUNC
,
3024 qio_channel_set_name(QIO_CHANNEL(ioc
), "migration-xen-save-state");
3025 f
= qemu_file_new_output(QIO_CHANNEL(ioc
));
3026 object_unref(OBJECT(ioc
));
3027 ret
= qemu_save_device_state(f
);
3028 if (ret
< 0 || qemu_fclose(f
) < 0) {
3029 error_setg(errp
, QERR_IO_ERROR
);
3031 /* libxl calls the QMP command "stop" before calling
3032 * "xen-save-devices-state" and in case of migration failure, libxl
3033 * would call "cont".
3034 * So call bdrv_inactivate_all (release locks) here to let the other
3035 * side of the migration take control of the images.
3037 if (live
&& !saved_vm_running
) {
3038 ret
= bdrv_inactivate_all();
3040 error_setg(errp
, "%s: bdrv_inactivate_all() failed (%d)",
3047 if (saved_vm_running
) {
3052 void qmp_xen_load_devices_state(const char *filename
, Error
**errp
)
3055 QIOChannelFile
*ioc
;
3058 /* Guest must be paused before loading the device state; the RAM state
3059 * will already have been loaded by xc
3061 if (runstate_is_running()) {
3062 error_setg(errp
, "Cannot update device state while vm is running");
3065 vm_stop(RUN_STATE_RESTORE_VM
);
3067 ioc
= qio_channel_file_new_path(filename
, O_RDONLY
| O_BINARY
, 0, errp
);
3071 qio_channel_set_name(QIO_CHANNEL(ioc
), "migration-xen-load-state");
3072 f
= qemu_file_new_input(QIO_CHANNEL(ioc
));
3073 object_unref(OBJECT(ioc
));
3075 ret
= qemu_loadvm_state(f
);
3078 error_setg(errp
, QERR_IO_ERROR
);
3080 migration_incoming_state_destroy();
3083 bool load_snapshot(const char *name
, const char *vmstate
,
3084 bool has_devices
, strList
*devices
, Error
**errp
)
3086 BlockDriverState
*bs_vm_state
;
3087 QEMUSnapshotInfo sn
;
3090 AioContext
*aio_context
;
3091 MigrationIncomingState
*mis
= migration_incoming_get_current();
3093 if (!bdrv_all_can_snapshot(has_devices
, devices
, errp
)) {
3096 ret
= bdrv_all_has_snapshot(name
, has_devices
, devices
, errp
);
3101 error_setg(errp
, "Snapshot '%s' does not exist in one or more devices",
3106 bs_vm_state
= bdrv_all_find_vmstate_bs(vmstate
, has_devices
, devices
, errp
);
3110 aio_context
= bdrv_get_aio_context(bs_vm_state
);
3112 /* Don't even try to load empty VM states */
3113 aio_context_acquire(aio_context
);
3114 ret
= bdrv_snapshot_find(bs_vm_state
, &sn
, name
);
3115 aio_context_release(aio_context
);
3118 } else if (sn
.vm_state_size
== 0) {
3119 error_setg(errp
, "This is a disk-only snapshot. Revert to it "
3120 " offline using qemu-img");
3125 * Flush the record/replay queue. Now the VM state is going
3126 * to change. Therefore we don't need to preserve its consistency
3128 replay_flush_events();
3130 /* Flush all IO requests so they don't interfere with the new state. */
3131 bdrv_drain_all_begin();
3133 ret
= bdrv_all_goto_snapshot(name
, has_devices
, devices
, errp
);
3138 /* restore the VM state */
3139 f
= qemu_fopen_bdrv(bs_vm_state
, 0);
3141 error_setg(errp
, "Could not open VM state file");
3145 qemu_system_reset(SHUTDOWN_CAUSE_SNAPSHOT_LOAD
);
3146 mis
->from_src_file
= f
;
3148 if (!yank_register_instance(MIGRATION_YANK_INSTANCE
, errp
)) {
3152 aio_context_acquire(aio_context
);
3153 ret
= qemu_loadvm_state(f
);
3154 migration_incoming_state_destroy();
3155 aio_context_release(aio_context
);
3157 bdrv_drain_all_end();
3160 error_setg(errp
, "Error %d while loading VM state", ret
);
3167 bdrv_drain_all_end();
3171 bool delete_snapshot(const char *name
, bool has_devices
,
3172 strList
*devices
, Error
**errp
)
3174 if (!bdrv_all_can_snapshot(has_devices
, devices
, errp
)) {
3178 if (bdrv_all_delete_snapshot(name
, has_devices
, devices
, errp
) < 0) {
3185 void vmstate_register_ram(MemoryRegion
*mr
, DeviceState
*dev
)
3187 qemu_ram_set_idstr(mr
->ram_block
,
3188 memory_region_name(mr
), dev
);
3189 qemu_ram_set_migratable(mr
->ram_block
);
3192 void vmstate_unregister_ram(MemoryRegion
*mr
, DeviceState
*dev
)
3194 qemu_ram_unset_idstr(mr
->ram_block
);
3195 qemu_ram_unset_migratable(mr
->ram_block
);
3198 void vmstate_register_ram_global(MemoryRegion
*mr
)
3200 vmstate_register_ram(mr
, NULL
);
3203 bool vmstate_check_only_migratable(const VMStateDescription
*vmsd
)
3205 /* check needed if --only-migratable is specified */
3206 if (!only_migratable
) {
3210 return !(vmsd
&& vmsd
->unmigratable
);
3213 typedef struct SnapshotJob
{
3223 static void qmp_snapshot_job_free(SnapshotJob
*s
)
3227 qapi_free_strList(s
->devices
);
3231 static void snapshot_load_job_bh(void *opaque
)
3234 SnapshotJob
*s
= container_of(job
, SnapshotJob
, common
);
3235 int orig_vm_running
;
3237 job_progress_set_remaining(&s
->common
, 1);
3239 orig_vm_running
= runstate_is_running();
3240 vm_stop(RUN_STATE_RESTORE_VM
);
3242 s
->ret
= load_snapshot(s
->tag
, s
->vmstate
, true, s
->devices
, s
->errp
);
3243 if (s
->ret
&& orig_vm_running
) {
3247 job_progress_update(&s
->common
, 1);
3249 qmp_snapshot_job_free(s
);
3253 static void snapshot_save_job_bh(void *opaque
)
3256 SnapshotJob
*s
= container_of(job
, SnapshotJob
, common
);
3258 job_progress_set_remaining(&s
->common
, 1);
3259 s
->ret
= save_snapshot(s
->tag
, false, s
->vmstate
,
3260 true, s
->devices
, s
->errp
);
3261 job_progress_update(&s
->common
, 1);
3263 qmp_snapshot_job_free(s
);
3267 static void snapshot_delete_job_bh(void *opaque
)
3270 SnapshotJob
*s
= container_of(job
, SnapshotJob
, common
);
3272 job_progress_set_remaining(&s
->common
, 1);
3273 s
->ret
= delete_snapshot(s
->tag
, true, s
->devices
, s
->errp
);
3274 job_progress_update(&s
->common
, 1);
3276 qmp_snapshot_job_free(s
);
3280 static int coroutine_fn
snapshot_save_job_run(Job
*job
, Error
**errp
)
3282 SnapshotJob
*s
= container_of(job
, SnapshotJob
, common
);
3284 s
->co
= qemu_coroutine_self();
3285 aio_bh_schedule_oneshot(qemu_get_aio_context(),
3286 snapshot_save_job_bh
, job
);
3287 qemu_coroutine_yield();
3288 return s
->ret
? 0 : -1;
3291 static int coroutine_fn
snapshot_load_job_run(Job
*job
, Error
**errp
)
3293 SnapshotJob
*s
= container_of(job
, SnapshotJob
, common
);
3295 s
->co
= qemu_coroutine_self();
3296 aio_bh_schedule_oneshot(qemu_get_aio_context(),
3297 snapshot_load_job_bh
, job
);
3298 qemu_coroutine_yield();
3299 return s
->ret
? 0 : -1;
3302 static int coroutine_fn
snapshot_delete_job_run(Job
*job
, Error
**errp
)
3304 SnapshotJob
*s
= container_of(job
, SnapshotJob
, common
);
3306 s
->co
= qemu_coroutine_self();
3307 aio_bh_schedule_oneshot(qemu_get_aio_context(),
3308 snapshot_delete_job_bh
, job
);
3309 qemu_coroutine_yield();
3310 return s
->ret
? 0 : -1;
3314 static const JobDriver snapshot_load_job_driver
= {
3315 .instance_size
= sizeof(SnapshotJob
),
3316 .job_type
= JOB_TYPE_SNAPSHOT_LOAD
,
3317 .run
= snapshot_load_job_run
,
3320 static const JobDriver snapshot_save_job_driver
= {
3321 .instance_size
= sizeof(SnapshotJob
),
3322 .job_type
= JOB_TYPE_SNAPSHOT_SAVE
,
3323 .run
= snapshot_save_job_run
,
3326 static const JobDriver snapshot_delete_job_driver
= {
3327 .instance_size
= sizeof(SnapshotJob
),
3328 .job_type
= JOB_TYPE_SNAPSHOT_DELETE
,
3329 .run
= snapshot_delete_job_run
,
3333 void qmp_snapshot_save(const char *job_id
,
3335 const char *vmstate
,
3341 s
= job_create(job_id
, &snapshot_save_job_driver
, NULL
,
3342 qemu_get_aio_context(), JOB_MANUAL_DISMISS
,
3348 s
->tag
= g_strdup(tag
);
3349 s
->vmstate
= g_strdup(vmstate
);
3350 s
->devices
= QAPI_CLONE(strList
, devices
);
3352 job_start(&s
->common
);
3355 void qmp_snapshot_load(const char *job_id
,
3357 const char *vmstate
,
3363 s
= job_create(job_id
, &snapshot_load_job_driver
, NULL
,
3364 qemu_get_aio_context(), JOB_MANUAL_DISMISS
,
3370 s
->tag
= g_strdup(tag
);
3371 s
->vmstate
= g_strdup(vmstate
);
3372 s
->devices
= QAPI_CLONE(strList
, devices
);
3374 job_start(&s
->common
);
3377 void qmp_snapshot_delete(const char *job_id
,
3384 s
= job_create(job_id
, &snapshot_delete_job_driver
, NULL
,
3385 qemu_get_aio_context(), JOB_MANUAL_DISMISS
,
3391 s
->tag
= g_strdup(tag
);
3392 s
->devices
= QAPI_CLONE(strList
, devices
);
3394 job_start(&s
->common
);