4 * Copyright IBM, Corp. 2008
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
16 #include "qemu/osdep.h"
17 #include "qemu/cutils.h"
18 #include "qemu/error-report.h"
19 #include "migration/blocker.h"
25 #include "migration/global_state.h"
26 #include "migration/misc.h"
27 #include "migration.h"
29 #include "qemu-file-channel.h"
30 #include "qemu-file.h"
31 #include "migration/vmstate.h"
32 #include "block/block.h"
33 #include "qapi/qmp/qerror.h"
34 #include "qapi/util.h"
37 #include "postcopy-ram.h"
38 #include "qemu/thread.h"
39 #include "qmp-commands.h"
41 #include "qapi-event.h"
42 #include "exec/target_page.h"
43 #include "io/channel-buffer.h"
44 #include "migration/colo.h"
45 #include "hw/boards.h"
46 #include "monitor/monitor.h"
48 #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */
50 /* Amount of time to allocate to each "chunk" of bandwidth-throttled
52 #define BUFFER_DELAY 100
53 #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
55 /* Time in milliseconds we are allowed to stop the source,
56 * for sending the last part */
57 #define DEFAULT_MIGRATE_SET_DOWNTIME 300
59 /* Maximum migrate downtime set to 2000 seconds */
60 #define MAX_MIGRATE_DOWNTIME_SECONDS 2000
61 #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
63 /* Default compression thread count */
64 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
65 /* Default decompression thread count, usually decompression is at
66 * least 4 times as fast as compression.*/
67 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
68 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */
69 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
70 /* Define default autoconverge cpu throttle migration parameters */
71 #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
72 #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
74 /* Migration XBZRLE default cache size */
75 #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
77 /* The delay time (in ms) between two COLO checkpoints
78 * Note: Please change this default value to 10000 when we support hybrid mode.
80 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200
82 static NotifierList migration_state_notifiers
=
83 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers
);
85 static bool deferred_incoming
;
87 /* Messages sent on the return path from destination to source */
88 enum mig_rp_message_type
{
89 MIG_RP_MSG_INVALID
= 0, /* Must be 0 */
90 MIG_RP_MSG_SHUT
, /* sibling will not send any more RP messages */
91 MIG_RP_MSG_PONG
, /* Response to a PING; data (seq: be32 ) */
93 MIG_RP_MSG_REQ_PAGES_ID
, /* data (start: be64, len: be32, id: string) */
94 MIG_RP_MSG_REQ_PAGES
, /* data (start: be64, len: be32) */
99 /* When we add fault tolerance, we could have several
100 migrations at once. For now we don't need to add
101 dynamic creation of migration */
103 static MigrationState
*current_migration
;
105 static bool migration_object_check(MigrationState
*ms
, Error
**errp
);
107 void migration_object_init(void)
109 MachineState
*ms
= MACHINE(qdev_get_machine());
112 /* This can only be called once. */
113 assert(!current_migration
);
114 current_migration
= MIGRATION_OBJ(object_new(TYPE_MIGRATION
));
116 if (!migration_object_check(current_migration
, &err
)) {
117 error_report_err(err
);
122 * We cannot really do this in migration_instance_init() since at
123 * that time global properties are not yet applied, then this
124 * value will be definitely replaced by something else.
126 if (ms
->enforce_config_section
) {
127 current_migration
->send_configuration
= true;
132 MigrationState
*migrate_get_current(void)
134 /* This can only be called after the object created. */
135 assert(current_migration
);
136 return current_migration
;
139 MigrationIncomingState
*migration_incoming_get_current(void)
142 static MigrationIncomingState mis_current
;
145 mis_current
.state
= MIGRATION_STATUS_NONE
;
146 memset(&mis_current
, 0, sizeof(MigrationIncomingState
));
147 qemu_mutex_init(&mis_current
.rp_mutex
);
148 qemu_event_init(&mis_current
.main_thread_load_event
, false);
154 void migration_incoming_state_destroy(void)
156 struct MigrationIncomingState
*mis
= migration_incoming_get_current();
158 if (mis
->to_src_file
) {
159 /* Tell source that we are done */
160 migrate_send_rp_shut(mis
, qemu_file_get_error(mis
->from_src_file
) != 0);
161 qemu_fclose(mis
->to_src_file
);
162 mis
->to_src_file
= NULL
;
165 if (mis
->from_src_file
) {
166 qemu_fclose(mis
->from_src_file
);
167 mis
->from_src_file
= NULL
;
170 qemu_event_destroy(&mis
->main_thread_load_event
);
173 static void migrate_generate_event(int new_state
)
175 if (migrate_use_events()) {
176 qapi_event_send_migration(new_state
, &error_abort
);
181 * Called on -incoming with a defer: uri.
182 * The migration can be started later after any parameters have been
185 static void deferred_incoming_migration(Error
**errp
)
187 if (deferred_incoming
) {
188 error_setg(errp
, "Incoming migration already deferred");
190 deferred_incoming
= true;
194 * Send a message on the return channel back to the source
197 static void migrate_send_rp_message(MigrationIncomingState
*mis
,
198 enum mig_rp_message_type message_type
,
199 uint16_t len
, void *data
)
201 trace_migrate_send_rp_message((int)message_type
, len
);
202 qemu_mutex_lock(&mis
->rp_mutex
);
203 qemu_put_be16(mis
->to_src_file
, (unsigned int)message_type
);
204 qemu_put_be16(mis
->to_src_file
, len
);
205 qemu_put_buffer(mis
->to_src_file
, data
, len
);
206 qemu_fflush(mis
->to_src_file
);
207 qemu_mutex_unlock(&mis
->rp_mutex
);
210 /* Request a range of pages from the source VM at the given
212 * rbname: Name of the RAMBlock to request the page in, if NULL it's the same
213 * as the last request (a name must have been given previously)
214 * Start: Address offset within the RB
215 * Len: Length in bytes required - must be a multiple of pagesize
217 void migrate_send_rp_req_pages(MigrationIncomingState
*mis
, const char *rbname
,
218 ram_addr_t start
, size_t len
)
220 uint8_t bufc
[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */
221 size_t msglen
= 12; /* start + len */
223 *(uint64_t *)bufc
= cpu_to_be64((uint64_t)start
);
224 *(uint32_t *)(bufc
+ 8) = cpu_to_be32((uint32_t)len
);
227 int rbname_len
= strlen(rbname
);
228 assert(rbname_len
< 256);
230 bufc
[msglen
++] = rbname_len
;
231 memcpy(bufc
+ msglen
, rbname
, rbname_len
);
232 msglen
+= rbname_len
;
233 migrate_send_rp_message(mis
, MIG_RP_MSG_REQ_PAGES_ID
, msglen
, bufc
);
235 migrate_send_rp_message(mis
, MIG_RP_MSG_REQ_PAGES
, msglen
, bufc
);
239 void qemu_start_incoming_migration(const char *uri
, Error
**errp
)
243 qapi_event_send_migration(MIGRATION_STATUS_SETUP
, &error_abort
);
244 if (!strcmp(uri
, "defer")) {
245 deferred_incoming_migration(errp
);
246 } else if (strstart(uri
, "tcp:", &p
)) {
247 tcp_start_incoming_migration(p
, errp
);
249 } else if (strstart(uri
, "rdma:", &p
)) {
250 rdma_start_incoming_migration(p
, errp
);
252 } else if (strstart(uri
, "exec:", &p
)) {
253 exec_start_incoming_migration(p
, errp
);
254 } else if (strstart(uri
, "unix:", &p
)) {
255 unix_start_incoming_migration(p
, errp
);
256 } else if (strstart(uri
, "fd:", &p
)) {
257 fd_start_incoming_migration(p
, errp
);
259 error_setg(errp
, "unknown migration protocol: %s", uri
);
263 static void process_incoming_migration_bh(void *opaque
)
265 Error
*local_err
= NULL
;
266 MigrationIncomingState
*mis
= opaque
;
268 /* Make sure all file formats flush their mutable metadata.
269 * If we get an error here, just don't restart the VM yet. */
270 bdrv_invalidate_cache_all(&local_err
);
272 error_report_err(local_err
);
278 * This must happen after all error conditions are dealt with and
279 * we're sure the VM is going to be running on this host.
281 qemu_announce_self();
283 /* If global state section was not received or we are in running
284 state, we need to obey autostart. Any other state is set with
287 if (!global_state_received() ||
288 global_state_get_runstate() == RUN_STATE_RUNNING
) {
292 runstate_set(RUN_STATE_PAUSED
);
295 runstate_set(global_state_get_runstate());
298 * This must happen after any state changes since as soon as an external
299 * observer sees this event they might start to prod at the VM assuming
302 migrate_set_state(&mis
->state
, MIGRATION_STATUS_ACTIVE
,
303 MIGRATION_STATUS_COMPLETED
);
304 qemu_bh_delete(mis
->bh
);
305 migration_incoming_state_destroy();
308 static void process_incoming_migration_co(void *opaque
)
310 QEMUFile
*f
= opaque
;
311 MigrationIncomingState
*mis
= migration_incoming_get_current();
315 mis
->from_src_file
= f
;
316 mis
->largest_page_size
= qemu_ram_pagesize_largest();
317 postcopy_state_set(POSTCOPY_INCOMING_NONE
);
318 migrate_set_state(&mis
->state
, MIGRATION_STATUS_NONE
,
319 MIGRATION_STATUS_ACTIVE
);
320 ret
= qemu_loadvm_state(f
);
322 ps
= postcopy_state_get();
323 trace_process_incoming_migration_co_end(ret
, ps
);
324 if (ps
!= POSTCOPY_INCOMING_NONE
) {
325 if (ps
== POSTCOPY_INCOMING_ADVISE
) {
327 * Where a migration had postcopy enabled (and thus went to advise)
328 * but managed to complete within the precopy period, we can use
331 postcopy_ram_incoming_cleanup(mis
);
332 } else if (ret
>= 0) {
334 * Postcopy was started, cleanup should happen at the end of the
337 trace_process_incoming_migration_co_postcopy_end_main();
340 /* Else if something went wrong then just fall out of the normal exit */
343 /* we get COLO info, and know if we are in COLO mode */
344 if (!ret
&& migration_incoming_enable_colo()) {
345 mis
->migration_incoming_co
= qemu_coroutine_self();
346 qemu_thread_create(&mis
->colo_incoming_thread
, "COLO incoming",
347 colo_process_incoming_thread
, mis
, QEMU_THREAD_JOINABLE
);
348 mis
->have_colo_incoming_thread
= true;
349 qemu_coroutine_yield();
351 /* Wait checkpoint incoming thread exit before free resource */
352 qemu_thread_join(&mis
->colo_incoming_thread
);
356 migrate_set_state(&mis
->state
, MIGRATION_STATUS_ACTIVE
,
357 MIGRATION_STATUS_FAILED
);
358 error_report("load of migration failed: %s", strerror(-ret
));
359 qemu_fclose(mis
->from_src_file
);
362 mis
->bh
= qemu_bh_new(process_incoming_migration_bh
, mis
);
363 qemu_bh_schedule(mis
->bh
);
366 void migration_fd_process_incoming(QEMUFile
*f
)
368 Coroutine
*co
= qemu_coroutine_create(process_incoming_migration_co
, f
);
370 qemu_file_set_blocking(f
, false);
371 qemu_coroutine_enter(co
);
375 * Send a 'SHUT' message on the return channel with the given value
376 * to indicate that we've finished with the RP. Non-0 value indicates
379 void migrate_send_rp_shut(MigrationIncomingState
*mis
,
384 buf
= cpu_to_be32(value
);
385 migrate_send_rp_message(mis
, MIG_RP_MSG_SHUT
, sizeof(buf
), &buf
);
389 * Send a 'PONG' message on the return channel with the given value
390 * (normally in response to a 'PING')
392 void migrate_send_rp_pong(MigrationIncomingState
*mis
,
397 buf
= cpu_to_be32(value
);
398 migrate_send_rp_message(mis
, MIG_RP_MSG_PONG
, sizeof(buf
), &buf
);
401 MigrationCapabilityStatusList
*qmp_query_migrate_capabilities(Error
**errp
)
403 MigrationCapabilityStatusList
*head
= NULL
;
404 MigrationCapabilityStatusList
*caps
;
405 MigrationState
*s
= migrate_get_current();
408 caps
= NULL
; /* silence compiler warning */
409 for (i
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
410 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
411 if (i
== MIGRATION_CAPABILITY_BLOCK
) {
416 head
= g_malloc0(sizeof(*caps
));
419 caps
->next
= g_malloc0(sizeof(*caps
));
423 g_malloc(sizeof(*caps
->value
));
424 caps
->value
->capability
= i
;
425 caps
->value
->state
= s
->enabled_capabilities
[i
];
431 MigrationParameters
*qmp_query_migrate_parameters(Error
**errp
)
433 MigrationParameters
*params
;
434 MigrationState
*s
= migrate_get_current();
436 /* TODO use QAPI_CLONE() instead of duplicating it inline */
437 params
= g_malloc0(sizeof(*params
));
438 params
->has_compress_level
= true;
439 params
->compress_level
= s
->parameters
.compress_level
;
440 params
->has_compress_threads
= true;
441 params
->compress_threads
= s
->parameters
.compress_threads
;
442 params
->has_decompress_threads
= true;
443 params
->decompress_threads
= s
->parameters
.decompress_threads
;
444 params
->has_cpu_throttle_initial
= true;
445 params
->cpu_throttle_initial
= s
->parameters
.cpu_throttle_initial
;
446 params
->has_cpu_throttle_increment
= true;
447 params
->cpu_throttle_increment
= s
->parameters
.cpu_throttle_increment
;
448 params
->has_tls_creds
= true;
449 params
->tls_creds
= g_strdup(s
->parameters
.tls_creds
);
450 params
->has_tls_hostname
= true;
451 params
->tls_hostname
= g_strdup(s
->parameters
.tls_hostname
);
452 params
->has_max_bandwidth
= true;
453 params
->max_bandwidth
= s
->parameters
.max_bandwidth
;
454 params
->has_downtime_limit
= true;
455 params
->downtime_limit
= s
->parameters
.downtime_limit
;
456 params
->has_x_checkpoint_delay
= true;
457 params
->x_checkpoint_delay
= s
->parameters
.x_checkpoint_delay
;
458 params
->has_block_incremental
= true;
459 params
->block_incremental
= s
->parameters
.block_incremental
;
465 * Return true if we're already in the middle of a migration
466 * (i.e. any of the active or setup states)
468 static bool migration_is_setup_or_active(int state
)
471 case MIGRATION_STATUS_ACTIVE
:
472 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
473 case MIGRATION_STATUS_SETUP
:
482 static void populate_ram_info(MigrationInfo
*info
, MigrationState
*s
)
484 info
->has_ram
= true;
485 info
->ram
= g_malloc0(sizeof(*info
->ram
));
486 info
->ram
->transferred
= ram_counters
.transferred
;
487 info
->ram
->total
= ram_bytes_total();
488 info
->ram
->duplicate
= ram_counters
.duplicate
;
489 /* legacy value. It is not used anymore */
490 info
->ram
->skipped
= 0;
491 info
->ram
->normal
= ram_counters
.normal
;
492 info
->ram
->normal_bytes
= ram_counters
.normal
*
493 qemu_target_page_size();
494 info
->ram
->mbps
= s
->mbps
;
495 info
->ram
->dirty_sync_count
= ram_counters
.dirty_sync_count
;
496 info
->ram
->postcopy_requests
= ram_counters
.postcopy_requests
;
497 info
->ram
->page_size
= qemu_target_page_size();
499 if (migrate_use_xbzrle()) {
500 info
->has_xbzrle_cache
= true;
501 info
->xbzrle_cache
= g_malloc0(sizeof(*info
->xbzrle_cache
));
502 info
->xbzrle_cache
->cache_size
= migrate_xbzrle_cache_size();
503 info
->xbzrle_cache
->bytes
= xbzrle_counters
.bytes
;
504 info
->xbzrle_cache
->pages
= xbzrle_counters
.pages
;
505 info
->xbzrle_cache
->cache_miss
= xbzrle_counters
.cache_miss
;
506 info
->xbzrle_cache
->cache_miss_rate
= xbzrle_counters
.cache_miss_rate
;
507 info
->xbzrle_cache
->overflow
= xbzrle_counters
.overflow
;
510 if (cpu_throttle_active()) {
511 info
->has_cpu_throttle_percentage
= true;
512 info
->cpu_throttle_percentage
= cpu_throttle_get_percentage();
515 if (s
->state
!= MIGRATION_STATUS_COMPLETED
) {
516 info
->ram
->remaining
= ram_bytes_remaining();
517 info
->ram
->dirty_pages_rate
= ram_counters
.dirty_pages_rate
;
521 static void populate_disk_info(MigrationInfo
*info
)
523 if (blk_mig_active()) {
524 info
->has_disk
= true;
525 info
->disk
= g_malloc0(sizeof(*info
->disk
));
526 info
->disk
->transferred
= blk_mig_bytes_transferred();
527 info
->disk
->remaining
= blk_mig_bytes_remaining();
528 info
->disk
->total
= blk_mig_bytes_total();
532 MigrationInfo
*qmp_query_migrate(Error
**errp
)
534 MigrationInfo
*info
= g_malloc0(sizeof(*info
));
535 MigrationState
*s
= migrate_get_current();
538 case MIGRATION_STATUS_NONE
:
539 /* no migration has happened ever */
541 case MIGRATION_STATUS_SETUP
:
542 info
->has_status
= true;
543 info
->has_total_time
= false;
545 case MIGRATION_STATUS_ACTIVE
:
546 case MIGRATION_STATUS_CANCELLING
:
547 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
548 /* TODO add some postcopy stats */
549 info
->has_status
= true;
550 info
->has_total_time
= true;
551 info
->total_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
)
553 info
->has_expected_downtime
= true;
554 info
->expected_downtime
= s
->expected_downtime
;
555 info
->has_setup_time
= true;
556 info
->setup_time
= s
->setup_time
;
558 populate_ram_info(info
, s
);
559 populate_disk_info(info
);
561 case MIGRATION_STATUS_COLO
:
562 info
->has_status
= true;
563 /* TODO: display COLO specific information (checkpoint info etc.) */
565 case MIGRATION_STATUS_COMPLETED
:
566 info
->has_status
= true;
567 info
->has_total_time
= true;
568 info
->total_time
= s
->total_time
;
569 info
->has_downtime
= true;
570 info
->downtime
= s
->downtime
;
571 info
->has_setup_time
= true;
572 info
->setup_time
= s
->setup_time
;
574 populate_ram_info(info
, s
);
576 case MIGRATION_STATUS_FAILED
:
577 info
->has_status
= true;
579 info
->has_error_desc
= true;
580 info
->error_desc
= g_strdup(error_get_pretty(s
->error
));
583 case MIGRATION_STATUS_CANCELLED
:
584 info
->has_status
= true;
587 info
->status
= s
->state
;
593 * @migration_caps_check - check capability validity
595 * @cap_list: old capability list, array of bool
596 * @params: new capabilities to be applied soon
597 * @errp: set *errp if the check failed, with reason
599 * Returns true if check passed, otherwise false.
601 static bool migrate_caps_check(bool *cap_list
,
602 MigrationCapabilityStatusList
*params
,
605 MigrationCapabilityStatusList
*cap
;
606 bool old_postcopy_cap
;
608 old_postcopy_cap
= cap_list
[MIGRATION_CAPABILITY_POSTCOPY_RAM
];
610 for (cap
= params
; cap
; cap
= cap
->next
) {
611 cap_list
[cap
->value
->capability
] = cap
->value
->state
;
614 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
615 if (cap_list
[MIGRATION_CAPABILITY_BLOCK
]) {
616 error_setg(errp
, "QEMU compiled without old-style (blk/-b, inc/-i) "
618 error_append_hint(errp
, "Use drive_mirror+NBD instead.\n");
623 if (cap_list
[MIGRATION_CAPABILITY_POSTCOPY_RAM
]) {
624 if (cap_list
[MIGRATION_CAPABILITY_COMPRESS
]) {
625 /* The decompression threads asynchronously write into RAM
626 * rather than use the atomic copies needed to avoid
627 * userfaulting. It should be possible to fix the decompression
628 * threads for compatibility in future.
630 error_setg(errp
, "Postcopy is not currently compatible "
635 /* This check is reasonably expensive, so only when it's being
636 * set the first time, also it's only the destination that needs
639 if (!old_postcopy_cap
&& runstate_check(RUN_STATE_INMIGRATE
) &&
640 !postcopy_ram_supported_by_host()) {
641 /* postcopy_ram_supported_by_host will have emitted a more
644 error_setg(errp
, "Postcopy is not supported");
652 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList
*params
,
655 MigrationState
*s
= migrate_get_current();
656 MigrationCapabilityStatusList
*cap
;
658 if (migration_is_setup_or_active(s
->state
)) {
659 error_setg(errp
, QERR_MIGRATION_ACTIVE
);
663 if (!migrate_caps_check(s
->enabled_capabilities
, params
, errp
)) {
667 for (cap
= params
; cap
; cap
= cap
->next
) {
668 s
->enabled_capabilities
[cap
->value
->capability
] = cap
->value
->state
;
673 * Check whether the parameters are valid. Error will be put into errp
674 * (if provided). Return true if valid, otherwise false.
676 static bool migrate_params_check(MigrationParameters
*params
, Error
**errp
)
678 if (params
->has_compress_level
&&
679 (params
->compress_level
< 0 || params
->compress_level
> 9)) {
680 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "compress_level",
681 "is invalid, it should be in the range of 0 to 9");
685 if (params
->has_compress_threads
&&
686 (params
->compress_threads
< 1 || params
->compress_threads
> 255)) {
687 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
689 "is invalid, it should be in the range of 1 to 255");
693 if (params
->has_decompress_threads
&&
694 (params
->decompress_threads
< 1 || params
->decompress_threads
> 255)) {
695 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
696 "decompress_threads",
697 "is invalid, it should be in the range of 1 to 255");
701 if (params
->has_cpu_throttle_initial
&&
702 (params
->cpu_throttle_initial
< 1 ||
703 params
->cpu_throttle_initial
> 99)) {
704 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
705 "cpu_throttle_initial",
706 "an integer in the range of 1 to 99");
710 if (params
->has_cpu_throttle_increment
&&
711 (params
->cpu_throttle_increment
< 1 ||
712 params
->cpu_throttle_increment
> 99)) {
713 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
714 "cpu_throttle_increment",
715 "an integer in the range of 1 to 99");
719 if (params
->has_max_bandwidth
&&
720 (params
->max_bandwidth
< 0 || params
->max_bandwidth
> SIZE_MAX
)) {
721 error_setg(errp
, "Parameter 'max_bandwidth' expects an integer in the"
722 " range of 0 to %zu bytes/second", SIZE_MAX
);
726 if (params
->has_downtime_limit
&&
727 (params
->downtime_limit
< 0 ||
728 params
->downtime_limit
> MAX_MIGRATE_DOWNTIME
)) {
729 error_setg(errp
, "Parameter 'downtime_limit' expects an integer in "
730 "the range of 0 to %d milliseconds",
731 MAX_MIGRATE_DOWNTIME
);
735 if (params
->has_x_checkpoint_delay
&& (params
->x_checkpoint_delay
< 0)) {
736 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
737 "x_checkpoint_delay",
738 "is invalid, it should be positive");
745 static void migrate_params_test_apply(MigrateSetParameters
*params
,
746 MigrationParameters
*dest
)
748 *dest
= migrate_get_current()->parameters
;
750 /* TODO use QAPI_CLONE() instead of duplicating it inline */
752 if (params
->has_compress_level
) {
753 dest
->compress_level
= params
->compress_level
;
756 if (params
->has_compress_threads
) {
757 dest
->compress_threads
= params
->compress_threads
;
760 if (params
->has_decompress_threads
) {
761 dest
->decompress_threads
= params
->decompress_threads
;
764 if (params
->has_cpu_throttle_initial
) {
765 dest
->cpu_throttle_initial
= params
->cpu_throttle_initial
;
768 if (params
->has_cpu_throttle_increment
) {
769 dest
->cpu_throttle_increment
= params
->cpu_throttle_increment
;
772 if (params
->has_tls_creds
) {
773 dest
->tls_creds
= g_strdup(params
->tls_creds
);
776 if (params
->has_tls_hostname
) {
777 dest
->tls_hostname
= g_strdup(params
->tls_hostname
);
780 if (params
->has_max_bandwidth
) {
781 dest
->max_bandwidth
= params
->max_bandwidth
;
784 if (params
->has_downtime_limit
) {
785 dest
->downtime_limit
= params
->downtime_limit
;
788 if (params
->has_x_checkpoint_delay
) {
789 dest
->x_checkpoint_delay
= params
->x_checkpoint_delay
;
792 if (params
->has_block_incremental
) {
793 dest
->block_incremental
= params
->block_incremental
;
797 static void migrate_params_apply(MigrateSetParameters
*params
)
799 MigrationState
*s
= migrate_get_current();
801 /* TODO use QAPI_CLONE() instead of duplicating it inline */
803 if (params
->has_compress_level
) {
804 s
->parameters
.compress_level
= params
->compress_level
;
807 if (params
->has_compress_threads
) {
808 s
->parameters
.compress_threads
= params
->compress_threads
;
811 if (params
->has_decompress_threads
) {
812 s
->parameters
.decompress_threads
= params
->decompress_threads
;
815 if (params
->has_cpu_throttle_initial
) {
816 s
->parameters
.cpu_throttle_initial
= params
->cpu_throttle_initial
;
819 if (params
->has_cpu_throttle_increment
) {
820 s
->parameters
.cpu_throttle_increment
= params
->cpu_throttle_increment
;
823 if (params
->has_tls_creds
) {
824 g_free(s
->parameters
.tls_creds
);
825 s
->parameters
.tls_creds
= g_strdup(params
->tls_creds
);
828 if (params
->has_tls_hostname
) {
829 g_free(s
->parameters
.tls_hostname
);
830 s
->parameters
.tls_hostname
= g_strdup(params
->tls_hostname
);
833 if (params
->has_max_bandwidth
) {
834 s
->parameters
.max_bandwidth
= params
->max_bandwidth
;
835 if (s
->to_dst_file
) {
836 qemu_file_set_rate_limit(s
->to_dst_file
,
837 s
->parameters
.max_bandwidth
/ XFER_LIMIT_RATIO
);
841 if (params
->has_downtime_limit
) {
842 s
->parameters
.downtime_limit
= params
->downtime_limit
;
845 if (params
->has_x_checkpoint_delay
) {
846 s
->parameters
.x_checkpoint_delay
= params
->x_checkpoint_delay
;
847 if (migration_in_colo_state()) {
848 colo_checkpoint_notify(s
);
852 if (params
->has_block_incremental
) {
853 s
->parameters
.block_incremental
= params
->block_incremental
;
857 void qmp_migrate_set_parameters(MigrateSetParameters
*params
, Error
**errp
)
859 MigrationParameters tmp
;
861 migrate_params_test_apply(params
, &tmp
);
863 if (!migrate_params_check(&tmp
, errp
)) {
864 /* Invalid parameter */
868 migrate_params_apply(params
);
872 void qmp_migrate_start_postcopy(Error
**errp
)
874 MigrationState
*s
= migrate_get_current();
876 if (!migrate_postcopy_ram()) {
877 error_setg(errp
, "Enable postcopy with migrate_set_capability before"
878 " the start of migration");
882 if (s
->state
== MIGRATION_STATUS_NONE
) {
883 error_setg(errp
, "Postcopy must be started after migration has been"
888 * we don't error if migration has finished since that would be racy
889 * with issuing this command.
891 atomic_set(&s
->start_postcopy
, true);
894 /* shared migration helpers */
896 void migrate_set_state(int *state
, int old_state
, int new_state
)
898 if (atomic_cmpxchg(state
, old_state
, new_state
) == old_state
) {
899 trace_migrate_set_state(new_state
);
900 migrate_generate_event(new_state
);
904 static MigrationCapabilityStatusList
*migrate_cap_add(
905 MigrationCapabilityStatusList
*list
,
906 MigrationCapability index
,
909 MigrationCapabilityStatusList
*cap
;
911 cap
= g_new0(MigrationCapabilityStatusList
, 1);
912 cap
->value
= g_new0(MigrationCapabilityStatus
, 1);
913 cap
->value
->capability
= index
;
914 cap
->value
->state
= state
;
920 void migrate_set_block_enabled(bool value
, Error
**errp
)
922 MigrationCapabilityStatusList
*cap
;
924 cap
= migrate_cap_add(NULL
, MIGRATION_CAPABILITY_BLOCK
, value
);
925 qmp_migrate_set_capabilities(cap
, errp
);
926 qapi_free_MigrationCapabilityStatusList(cap
);
929 static void migrate_set_block_incremental(MigrationState
*s
, bool value
)
931 s
->parameters
.block_incremental
= value
;
934 static void block_cleanup_parameters(MigrationState
*s
)
936 if (s
->must_remove_block_options
) {
937 /* setting to false can never fail */
938 migrate_set_block_enabled(false, &error_abort
);
939 migrate_set_block_incremental(s
, false);
940 s
->must_remove_block_options
= false;
944 static void migrate_fd_cleanup(void *opaque
)
946 MigrationState
*s
= opaque
;
948 qemu_bh_delete(s
->cleanup_bh
);
949 s
->cleanup_bh
= NULL
;
951 if (s
->to_dst_file
) {
952 trace_migrate_fd_cleanup();
953 qemu_mutex_unlock_iothread();
954 if (s
->migration_thread_running
) {
955 qemu_thread_join(&s
->thread
);
956 s
->migration_thread_running
= false;
958 qemu_mutex_lock_iothread();
960 qemu_fclose(s
->to_dst_file
);
961 s
->to_dst_file
= NULL
;
964 assert((s
->state
!= MIGRATION_STATUS_ACTIVE
) &&
965 (s
->state
!= MIGRATION_STATUS_POSTCOPY_ACTIVE
));
967 if (s
->state
== MIGRATION_STATUS_CANCELLING
) {
968 migrate_set_state(&s
->state
, MIGRATION_STATUS_CANCELLING
,
969 MIGRATION_STATUS_CANCELLED
);
972 notifier_list_notify(&migration_state_notifiers
, s
);
973 block_cleanup_parameters(s
);
976 void migrate_fd_error(MigrationState
*s
, const Error
*error
)
978 trace_migrate_fd_error(error_get_pretty(error
));
979 assert(s
->to_dst_file
== NULL
);
980 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
981 MIGRATION_STATUS_FAILED
);
983 s
->error
= error_copy(error
);
985 notifier_list_notify(&migration_state_notifiers
, s
);
986 block_cleanup_parameters(s
);
989 static void migrate_fd_cancel(MigrationState
*s
)
992 QEMUFile
*f
= migrate_get_current()->to_dst_file
;
993 trace_migrate_fd_cancel();
995 if (s
->rp_state
.from_dst_file
) {
996 /* shutdown the rp socket, so causing the rp thread to shutdown */
997 qemu_file_shutdown(s
->rp_state
.from_dst_file
);
1001 old_state
= s
->state
;
1002 if (!migration_is_setup_or_active(old_state
)) {
1005 migrate_set_state(&s
->state
, old_state
, MIGRATION_STATUS_CANCELLING
);
1006 } while (s
->state
!= MIGRATION_STATUS_CANCELLING
);
1009 * If we're unlucky the migration code might be stuck somewhere in a
1010 * send/write while the network has failed and is waiting to timeout;
1011 * if we've got shutdown(2) available then we can force it to quit.
1012 * The outgoing qemu file gets closed in migrate_fd_cleanup that is
1013 * called in a bh, so there is no race against this cancel.
1015 if (s
->state
== MIGRATION_STATUS_CANCELLING
&& f
) {
1016 qemu_file_shutdown(f
);
1018 if (s
->state
== MIGRATION_STATUS_CANCELLING
&& s
->block_inactive
) {
1019 Error
*local_err
= NULL
;
1021 bdrv_invalidate_cache_all(&local_err
);
1023 error_report_err(local_err
);
1025 s
->block_inactive
= false;
1028 block_cleanup_parameters(s
);
1031 void add_migration_state_change_notifier(Notifier
*notify
)
1033 notifier_list_add(&migration_state_notifiers
, notify
);
1036 void remove_migration_state_change_notifier(Notifier
*notify
)
1038 notifier_remove(notify
);
1041 bool migration_in_setup(MigrationState
*s
)
1043 return s
->state
== MIGRATION_STATUS_SETUP
;
1046 bool migration_has_finished(MigrationState
*s
)
1048 return s
->state
== MIGRATION_STATUS_COMPLETED
;
1051 bool migration_has_failed(MigrationState
*s
)
1053 return (s
->state
== MIGRATION_STATUS_CANCELLED
||
1054 s
->state
== MIGRATION_STATUS_FAILED
);
1057 bool migration_in_postcopy(void)
1059 MigrationState
*s
= migrate_get_current();
1061 return (s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
);
1064 bool migration_in_postcopy_after_devices(MigrationState
*s
)
1066 return migration_in_postcopy() && s
->postcopy_after_devices
;
1069 bool migration_is_idle(void)
1071 MigrationState
*s
= migrate_get_current();
1074 case MIGRATION_STATUS_NONE
:
1075 case MIGRATION_STATUS_CANCELLED
:
1076 case MIGRATION_STATUS_COMPLETED
:
1077 case MIGRATION_STATUS_FAILED
:
1079 case MIGRATION_STATUS_SETUP
:
1080 case MIGRATION_STATUS_CANCELLING
:
1081 case MIGRATION_STATUS_ACTIVE
:
1082 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
1083 case MIGRATION_STATUS_COLO
:
1085 case MIGRATION_STATUS__MAX
:
1086 g_assert_not_reached();
1092 MigrationState
*migrate_init(void)
1094 MigrationState
*s
= migrate_get_current();
1097 * Reinitialise all migration state, except
1098 * parameters/capabilities that the user set, and
1104 s
->to_dst_file
= NULL
;
1105 s
->state
= MIGRATION_STATUS_NONE
;
1106 s
->rp_state
.from_dst_file
= NULL
;
1107 s
->rp_state
.error
= false;
1110 s
->expected_downtime
= 0;
1112 s
->start_postcopy
= false;
1113 s
->postcopy_after_devices
= false;
1114 s
->migration_thread_running
= false;
1115 error_free(s
->error
);
1118 migrate_set_state(&s
->state
, MIGRATION_STATUS_NONE
, MIGRATION_STATUS_SETUP
);
1120 s
->total_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
1124 static GSList
*migration_blockers
;
1126 int migrate_add_blocker(Error
*reason
, Error
**errp
)
1128 if (migrate_get_current()->only_migratable
) {
1129 error_propagate(errp
, error_copy(reason
));
1130 error_prepend(errp
, "disallowing migration blocker "
1131 "(--only_migratable) for: ");
1135 if (migration_is_idle()) {
1136 migration_blockers
= g_slist_prepend(migration_blockers
, reason
);
1140 error_propagate(errp
, error_copy(reason
));
1141 error_prepend(errp
, "disallowing migration blocker (migration in "
1146 void migrate_del_blocker(Error
*reason
)
1148 migration_blockers
= g_slist_remove(migration_blockers
, reason
);
1151 void qmp_migrate_incoming(const char *uri
, Error
**errp
)
1153 Error
*local_err
= NULL
;
1154 static bool once
= true;
1156 if (!deferred_incoming
) {
1157 error_setg(errp
, "For use with '-incoming defer'");
1161 error_setg(errp
, "The incoming migration has already been started");
1164 qemu_start_incoming_migration(uri
, &local_err
);
1167 error_propagate(errp
, local_err
);
1174 bool migration_is_blocked(Error
**errp
)
1176 if (qemu_savevm_state_blocked(errp
)) {
1180 if (migration_blockers
) {
1181 error_propagate(errp
, error_copy(migration_blockers
->data
));
1188 void qmp_migrate(const char *uri
, bool has_blk
, bool blk
,
1189 bool has_inc
, bool inc
, bool has_detach
, bool detach
,
1192 Error
*local_err
= NULL
;
1193 MigrationState
*s
= migrate_get_current();
1196 if (migration_is_setup_or_active(s
->state
) ||
1197 s
->state
== MIGRATION_STATUS_CANCELLING
||
1198 s
->state
== MIGRATION_STATUS_COLO
) {
1199 error_setg(errp
, QERR_MIGRATION_ACTIVE
);
1202 if (runstate_check(RUN_STATE_INMIGRATE
)) {
1203 error_setg(errp
, "Guest is waiting for an incoming migration");
1207 if (migration_is_blocked(errp
)) {
1211 if ((has_blk
&& blk
) || (has_inc
&& inc
)) {
1212 if (migrate_use_block() || migrate_use_block_incremental()) {
1213 error_setg(errp
, "Command options are incompatible with "
1214 "current migration capabilities");
1217 migrate_set_block_enabled(true, &local_err
);
1219 error_propagate(errp
, local_err
);
1222 s
->must_remove_block_options
= true;
1225 if (has_inc
&& inc
) {
1226 migrate_set_block_incremental(s
, true);
1231 if (strstart(uri
, "tcp:", &p
)) {
1232 tcp_start_outgoing_migration(s
, p
, &local_err
);
1234 } else if (strstart(uri
, "rdma:", &p
)) {
1235 rdma_start_outgoing_migration(s
, p
, &local_err
);
1237 } else if (strstart(uri
, "exec:", &p
)) {
1238 exec_start_outgoing_migration(s
, p
, &local_err
);
1239 } else if (strstart(uri
, "unix:", &p
)) {
1240 unix_start_outgoing_migration(s
, p
, &local_err
);
1241 } else if (strstart(uri
, "fd:", &p
)) {
1242 fd_start_outgoing_migration(s
, p
, &local_err
);
1244 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "uri",
1245 "a valid migration protocol");
1246 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
1247 MIGRATION_STATUS_FAILED
);
1252 migrate_fd_error(s
, local_err
);
1253 error_propagate(errp
, local_err
);
1258 void qmp_migrate_cancel(Error
**errp
)
1260 migrate_fd_cancel(migrate_get_current());
1263 void qmp_migrate_set_cache_size(int64_t value
, Error
**errp
)
1265 MigrationState
*s
= migrate_get_current();
1268 /* Check for truncation */
1269 if (value
!= (size_t)value
) {
1270 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "cache size",
1271 "exceeding address space");
1275 /* Cache should not be larger than guest ram size */
1276 if (value
> ram_bytes_total()) {
1277 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "cache size",
1278 "exceeds guest ram size ");
1282 new_size
= xbzrle_cache_resize(value
);
1284 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "cache size",
1285 "is smaller than page size");
1289 s
->xbzrle_cache_size
= new_size
;
1292 int64_t qmp_query_migrate_cache_size(Error
**errp
)
1294 return migrate_xbzrle_cache_size();
1297 void qmp_migrate_set_speed(int64_t value
, Error
**errp
)
1299 MigrateSetParameters p
= {
1300 .has_max_bandwidth
= true,
1301 .max_bandwidth
= value
,
1304 qmp_migrate_set_parameters(&p
, errp
);
1307 void qmp_migrate_set_downtime(double value
, Error
**errp
)
1309 if (value
< 0 || value
> MAX_MIGRATE_DOWNTIME_SECONDS
) {
1310 error_setg(errp
, "Parameter 'downtime_limit' expects an integer in "
1311 "the range of 0 to %d seconds",
1312 MAX_MIGRATE_DOWNTIME_SECONDS
);
1316 value
*= 1000; /* Convert to milliseconds */
1317 value
= MAX(0, MIN(INT64_MAX
, value
));
1319 MigrateSetParameters p
= {
1320 .has_downtime_limit
= true,
1321 .downtime_limit
= value
,
1324 qmp_migrate_set_parameters(&p
, errp
);
1327 bool migrate_release_ram(void)
1331 s
= migrate_get_current();
1333 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_RELEASE_RAM
];
1336 bool migrate_postcopy_ram(void)
1340 s
= migrate_get_current();
1342 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_POSTCOPY_RAM
];
1345 bool migrate_auto_converge(void)
1349 s
= migrate_get_current();
1351 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_AUTO_CONVERGE
];
1354 bool migrate_zero_blocks(void)
1358 s
= migrate_get_current();
1360 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_ZERO_BLOCKS
];
1363 bool migrate_use_compression(void)
1367 s
= migrate_get_current();
1369 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_COMPRESS
];
1372 int migrate_compress_level(void)
1376 s
= migrate_get_current();
1378 return s
->parameters
.compress_level
;
1381 int migrate_compress_threads(void)
1385 s
= migrate_get_current();
1387 return s
->parameters
.compress_threads
;
1390 int migrate_decompress_threads(void)
1394 s
= migrate_get_current();
1396 return s
->parameters
.decompress_threads
;
1399 bool migrate_use_events(void)
1403 s
= migrate_get_current();
1405 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_EVENTS
];
1408 int migrate_use_xbzrle(void)
1412 s
= migrate_get_current();
1414 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_XBZRLE
];
1417 int64_t migrate_xbzrle_cache_size(void)
1421 s
= migrate_get_current();
1423 return s
->xbzrle_cache_size
;
1426 bool migrate_use_block(void)
1430 s
= migrate_get_current();
1432 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_BLOCK
];
1435 bool migrate_use_return_path(void)
1439 s
= migrate_get_current();
1441 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_RETURN_PATH
];
1444 bool migrate_use_block_incremental(void)
1448 s
= migrate_get_current();
1450 return s
->parameters
.block_incremental
;
1453 /* migration thread support */
1455 * Something bad happened to the RP stream, mark an error
1456 * The caller shall print or trace something to indicate why
1458 static void mark_source_rp_bad(MigrationState
*s
)
1460 s
->rp_state
.error
= true;
1463 static struct rp_cmd_args
{
1464 ssize_t len
; /* -1 = variable */
1467 [MIG_RP_MSG_INVALID
] = { .len
= -1, .name
= "INVALID" },
1468 [MIG_RP_MSG_SHUT
] = { .len
= 4, .name
= "SHUT" },
1469 [MIG_RP_MSG_PONG
] = { .len
= 4, .name
= "PONG" },
1470 [MIG_RP_MSG_REQ_PAGES
] = { .len
= 12, .name
= "REQ_PAGES" },
1471 [MIG_RP_MSG_REQ_PAGES_ID
] = { .len
= -1, .name
= "REQ_PAGES_ID" },
1472 [MIG_RP_MSG_MAX
] = { .len
= -1, .name
= "MAX" },
1476 * Process a request for pages received on the return path,
1477 * We're allowed to send more than requested (e.g. to round to our page size)
1478 * and we don't need to send pages that have already been sent.
1480 static void migrate_handle_rp_req_pages(MigrationState
*ms
, const char* rbname
,
1481 ram_addr_t start
, size_t len
)
1483 long our_host_ps
= getpagesize();
1485 trace_migrate_handle_rp_req_pages(rbname
, start
, len
);
1488 * Since we currently insist on matching page sizes, just sanity check
1489 * we're being asked for whole host pages.
1491 if (start
& (our_host_ps
-1) ||
1492 (len
& (our_host_ps
-1))) {
1493 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
1494 " len: %zd", __func__
, start
, len
);
1495 mark_source_rp_bad(ms
);
1499 if (ram_save_queue_pages(rbname
, start
, len
)) {
1500 mark_source_rp_bad(ms
);
1505 * Handles messages sent on the return path towards the source VM
1508 static void *source_return_path_thread(void *opaque
)
1510 MigrationState
*ms
= opaque
;
1511 QEMUFile
*rp
= ms
->rp_state
.from_dst_file
;
1512 uint16_t header_len
, header_type
;
1514 uint32_t tmp32
, sibling_error
;
1515 ram_addr_t start
= 0; /* =0 to silence warning */
1516 size_t len
= 0, expected_len
;
1519 trace_source_return_path_thread_entry();
1520 while (!ms
->rp_state
.error
&& !qemu_file_get_error(rp
) &&
1521 migration_is_setup_or_active(ms
->state
)) {
1522 trace_source_return_path_thread_loop_top();
1523 header_type
= qemu_get_be16(rp
);
1524 header_len
= qemu_get_be16(rp
);
1526 if (header_type
>= MIG_RP_MSG_MAX
||
1527 header_type
== MIG_RP_MSG_INVALID
) {
1528 error_report("RP: Received invalid message 0x%04x length 0x%04x",
1529 header_type
, header_len
);
1530 mark_source_rp_bad(ms
);
1534 if ((rp_cmd_args
[header_type
].len
!= -1 &&
1535 header_len
!= rp_cmd_args
[header_type
].len
) ||
1536 header_len
> sizeof(buf
)) {
1537 error_report("RP: Received '%s' message (0x%04x) with"
1538 "incorrect length %d expecting %zu",
1539 rp_cmd_args
[header_type
].name
, header_type
, header_len
,
1540 (size_t)rp_cmd_args
[header_type
].len
);
1541 mark_source_rp_bad(ms
);
1545 /* We know we've got a valid header by this point */
1546 res
= qemu_get_buffer(rp
, buf
, header_len
);
1547 if (res
!= header_len
) {
1548 error_report("RP: Failed reading data for message 0x%04x"
1549 " read %d expected %d",
1550 header_type
, res
, header_len
);
1551 mark_source_rp_bad(ms
);
1555 /* OK, we have the message and the data */
1556 switch (header_type
) {
1557 case MIG_RP_MSG_SHUT
:
1558 sibling_error
= ldl_be_p(buf
);
1559 trace_source_return_path_thread_shut(sibling_error
);
1560 if (sibling_error
) {
1561 error_report("RP: Sibling indicated error %d", sibling_error
);
1562 mark_source_rp_bad(ms
);
1565 * We'll let the main thread deal with closing the RP
1566 * we could do a shutdown(2) on it, but we're the only user
1567 * anyway, so there's nothing gained.
1571 case MIG_RP_MSG_PONG
:
1572 tmp32
= ldl_be_p(buf
);
1573 trace_source_return_path_thread_pong(tmp32
);
1576 case MIG_RP_MSG_REQ_PAGES
:
1577 start
= ldq_be_p(buf
);
1578 len
= ldl_be_p(buf
+ 8);
1579 migrate_handle_rp_req_pages(ms
, NULL
, start
, len
);
1582 case MIG_RP_MSG_REQ_PAGES_ID
:
1583 expected_len
= 12 + 1; /* header + termination */
1585 if (header_len
>= expected_len
) {
1586 start
= ldq_be_p(buf
);
1587 len
= ldl_be_p(buf
+ 8);
1588 /* Now we expect an idstr */
1589 tmp32
= buf
[12]; /* Length of the following idstr */
1590 buf
[13 + tmp32
] = '\0';
1591 expected_len
+= tmp32
;
1593 if (header_len
!= expected_len
) {
1594 error_report("RP: Req_Page_id with length %d expecting %zd",
1595 header_len
, expected_len
);
1596 mark_source_rp_bad(ms
);
1599 migrate_handle_rp_req_pages(ms
, (char *)&buf
[13], start
, len
);
1606 if (qemu_file_get_error(rp
)) {
1607 trace_source_return_path_thread_bad_end();
1608 mark_source_rp_bad(ms
);
1611 trace_source_return_path_thread_end();
1613 ms
->rp_state
.from_dst_file
= NULL
;
1618 static int open_return_path_on_source(MigrationState
*ms
)
1621 ms
->rp_state
.from_dst_file
= qemu_file_get_return_path(ms
->to_dst_file
);
1622 if (!ms
->rp_state
.from_dst_file
) {
1626 trace_open_return_path_on_source();
1627 qemu_thread_create(&ms
->rp_state
.rp_thread
, "return path",
1628 source_return_path_thread
, ms
, QEMU_THREAD_JOINABLE
);
1630 trace_open_return_path_on_source_continue();
1635 /* Returns 0 if the RP was ok, otherwise there was an error on the RP */
1636 static int await_return_path_close_on_source(MigrationState
*ms
)
1639 * If this is a normal exit then the destination will send a SHUT and the
1640 * rp_thread will exit, however if there's an error we need to cause
1643 if (qemu_file_get_error(ms
->to_dst_file
) && ms
->rp_state
.from_dst_file
) {
1645 * shutdown(2), if we have it, will cause it to unblock if it's stuck
1646 * waiting for the destination.
1648 qemu_file_shutdown(ms
->rp_state
.from_dst_file
);
1649 mark_source_rp_bad(ms
);
1651 trace_await_return_path_close_on_source_joining();
1652 qemu_thread_join(&ms
->rp_state
.rp_thread
);
1653 trace_await_return_path_close_on_source_close();
1654 return ms
->rp_state
.error
;
1658 * Switch from normal iteration to postcopy
1659 * Returns non-0 on error
1661 static int postcopy_start(MigrationState
*ms
, bool *old_vm_running
)
1664 QIOChannelBuffer
*bioc
;
1666 int64_t time_at_stop
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
1667 bool restart_block
= false;
1668 migrate_set_state(&ms
->state
, MIGRATION_STATUS_ACTIVE
,
1669 MIGRATION_STATUS_POSTCOPY_ACTIVE
);
1671 trace_postcopy_start();
1672 qemu_mutex_lock_iothread();
1673 trace_postcopy_start_set_run();
1675 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER
);
1676 *old_vm_running
= runstate_is_running();
1677 global_state_store();
1678 ret
= vm_stop_force_state(RUN_STATE_FINISH_MIGRATE
);
1683 ret
= bdrv_inactivate_all();
1687 restart_block
= true;
1690 * Cause any non-postcopiable, but iterative devices to
1691 * send out their final data.
1693 qemu_savevm_state_complete_precopy(ms
->to_dst_file
, true, false);
1696 * in Finish migrate and with the io-lock held everything should
1697 * be quiet, but we've potentially still got dirty pages and we
1698 * need to tell the destination to throw any pages it's already received
1701 if (ram_postcopy_send_discard_bitmap(ms
)) {
1702 error_report("postcopy send discard bitmap failed");
1707 * send rest of state - note things that are doing postcopy
1708 * will notice we're in POSTCOPY_ACTIVE and not actually
1709 * wrap their state up here
1711 qemu_file_set_rate_limit(ms
->to_dst_file
, INT64_MAX
);
1712 /* Ping just for debugging, helps line traces up */
1713 qemu_savevm_send_ping(ms
->to_dst_file
, 2);
1716 * While loading the device state we may trigger page transfer
1717 * requests and the fd must be free to process those, and thus
1718 * the destination must read the whole device state off the fd before
1719 * it starts processing it. Unfortunately the ad-hoc migration format
1720 * doesn't allow the destination to know the size to read without fully
1721 * parsing it through each devices load-state code (especially the open
1722 * coded devices that use get/put).
1723 * So we wrap the device state up in a package with a length at the start;
1724 * to do this we use a qemu_buf to hold the whole of the device state.
1726 bioc
= qio_channel_buffer_new(4096);
1727 qio_channel_set_name(QIO_CHANNEL(bioc
), "migration-postcopy-buffer");
1728 fb
= qemu_fopen_channel_output(QIO_CHANNEL(bioc
));
1729 object_unref(OBJECT(bioc
));
1732 * Make sure the receiver can get incoming pages before we send the rest
1735 qemu_savevm_send_postcopy_listen(fb
);
1737 qemu_savevm_state_complete_precopy(fb
, false, false);
1738 qemu_savevm_send_ping(fb
, 3);
1740 qemu_savevm_send_postcopy_run(fb
);
1742 /* <><> end of stuff going into the package */
1744 /* Last point of recovery; as soon as we send the package the destination
1745 * can open devices and potentially start running.
1746 * Lets just check again we've not got any errors.
1748 ret
= qemu_file_get_error(ms
->to_dst_file
);
1750 error_report("postcopy_start: Migration stream errored (pre package)");
1754 restart_block
= false;
1756 /* Now send that blob */
1757 if (qemu_savevm_send_packaged(ms
->to_dst_file
, bioc
->data
, bioc
->usage
)) {
1762 /* Send a notify to give a chance for anything that needs to happen
1763 * at the transition to postcopy and after the device state; in particular
1764 * spice needs to trigger a transition now
1766 ms
->postcopy_after_devices
= true;
1767 notifier_list_notify(&migration_state_notifiers
, ms
);
1769 ms
->downtime
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
) - time_at_stop
;
1771 qemu_mutex_unlock_iothread();
1774 * Although this ping is just for debug, it could potentially be
1775 * used for getting a better measurement of downtime at the source.
1777 qemu_savevm_send_ping(ms
->to_dst_file
, 4);
1779 if (migrate_release_ram()) {
1780 ram_postcopy_migrated_memory_release(ms
);
1783 ret
= qemu_file_get_error(ms
->to_dst_file
);
1785 error_report("postcopy_start: Migration stream errored");
1786 migrate_set_state(&ms
->state
, MIGRATION_STATUS_POSTCOPY_ACTIVE
,
1787 MIGRATION_STATUS_FAILED
);
1795 migrate_set_state(&ms
->state
, MIGRATION_STATUS_POSTCOPY_ACTIVE
,
1796 MIGRATION_STATUS_FAILED
);
1797 if (restart_block
) {
1798 /* A failure happened early enough that we know the destination hasn't
1799 * accessed block devices, so we're safe to recover.
1801 Error
*local_err
= NULL
;
1803 bdrv_invalidate_cache_all(&local_err
);
1805 error_report_err(local_err
);
1808 qemu_mutex_unlock_iothread();
1813 * migration_completion: Used by migration_thread when there's not much left.
1814 * The caller 'breaks' the loop when this returns.
1816 * @s: Current migration state
1817 * @current_active_state: The migration state we expect to be in
1818 * @*old_vm_running: Pointer to old_vm_running flag
1819 * @*start_time: Pointer to time to update
1821 static void migration_completion(MigrationState
*s
, int current_active_state
,
1822 bool *old_vm_running
,
1823 int64_t *start_time
)
1827 if (s
->state
== MIGRATION_STATUS_ACTIVE
) {
1828 qemu_mutex_lock_iothread();
1829 *start_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
1830 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER
);
1831 *old_vm_running
= runstate_is_running();
1832 ret
= global_state_store();
1835 bool inactivate
= !migrate_colo_enabled();
1836 ret
= vm_stop_force_state(RUN_STATE_FINISH_MIGRATE
);
1838 qemu_file_set_rate_limit(s
->to_dst_file
, INT64_MAX
);
1839 ret
= qemu_savevm_state_complete_precopy(s
->to_dst_file
, false,
1842 if (inactivate
&& ret
>= 0) {
1843 s
->block_inactive
= true;
1846 qemu_mutex_unlock_iothread();
1851 } else if (s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
) {
1852 trace_migration_completion_postcopy_end();
1854 qemu_savevm_state_complete_postcopy(s
->to_dst_file
);
1855 trace_migration_completion_postcopy_end_after_complete();
1859 * If rp was opened we must clean up the thread before
1860 * cleaning everything else up (since if there are no failures
1861 * it will wait for the destination to send it's status in
1864 if (s
->rp_state
.from_dst_file
) {
1866 trace_migration_return_path_end_before();
1867 rp_error
= await_return_path_close_on_source(s
);
1868 trace_migration_return_path_end_after(rp_error
);
1870 goto fail_invalidate
;
1874 if (qemu_file_get_error(s
->to_dst_file
)) {
1875 trace_migration_completion_file_err();
1876 goto fail_invalidate
;
1879 if (!migrate_colo_enabled()) {
1880 migrate_set_state(&s
->state
, current_active_state
,
1881 MIGRATION_STATUS_COMPLETED
);
1887 /* If not doing postcopy, vm_start() will be called: let's regain
1888 * control on images.
1890 if (s
->state
== MIGRATION_STATUS_ACTIVE
) {
1891 Error
*local_err
= NULL
;
1893 qemu_mutex_lock_iothread();
1894 bdrv_invalidate_cache_all(&local_err
);
1896 error_report_err(local_err
);
1898 s
->block_inactive
= false;
1900 qemu_mutex_unlock_iothread();
1904 migrate_set_state(&s
->state
, current_active_state
,
1905 MIGRATION_STATUS_FAILED
);
1908 bool migrate_colo_enabled(void)
1910 MigrationState
*s
= migrate_get_current();
1911 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_X_COLO
];
1915 * Master migration thread on the source VM.
1916 * It drives the migration and pumps the data down the outgoing channel.
1918 static void *migration_thread(void *opaque
)
1920 MigrationState
*s
= opaque
;
1921 /* Used by the bandwidth calcs, updated later */
1922 int64_t initial_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
1923 int64_t setup_start
= qemu_clock_get_ms(QEMU_CLOCK_HOST
);
1924 int64_t initial_bytes
= 0;
1926 * The final stage happens when the remaining data is smaller than
1927 * this threshold; it's calculated from the requested downtime and
1928 * measured bandwidth
1930 int64_t threshold_size
= 0;
1931 int64_t start_time
= initial_time
;
1933 bool old_vm_running
= false;
1934 bool entered_postcopy
= false;
1935 /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */
1936 enum MigrationStatus current_active_state
= MIGRATION_STATUS_ACTIVE
;
1937 bool enable_colo
= migrate_colo_enabled();
1939 rcu_register_thread();
1941 qemu_savevm_state_header(s
->to_dst_file
);
1944 * If we opened the return path, we need to make sure dst has it
1947 if (s
->rp_state
.from_dst_file
) {
1948 /* Now tell the dest that it should open its end so it can reply */
1949 qemu_savevm_send_open_return_path(s
->to_dst_file
);
1951 /* And do a ping that will make stuff easier to debug */
1952 qemu_savevm_send_ping(s
->to_dst_file
, 1);
1955 if (migrate_postcopy_ram()) {
1957 * Tell the destination that we *might* want to do postcopy later;
1958 * if the other end can't do postcopy it should fail now, nice and
1961 qemu_savevm_send_postcopy_advise(s
->to_dst_file
);
1964 qemu_savevm_state_setup(s
->to_dst_file
);
1966 s
->setup_time
= qemu_clock_get_ms(QEMU_CLOCK_HOST
) - setup_start
;
1967 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
1968 MIGRATION_STATUS_ACTIVE
);
1970 trace_migration_thread_setup_complete();
1972 while (s
->state
== MIGRATION_STATUS_ACTIVE
||
1973 s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
) {
1974 int64_t current_time
;
1975 uint64_t pending_size
;
1977 if (!qemu_file_rate_limit(s
->to_dst_file
)) {
1978 uint64_t pend_post
, pend_nonpost
;
1980 qemu_savevm_state_pending(s
->to_dst_file
, threshold_size
,
1981 &pend_nonpost
, &pend_post
);
1982 pending_size
= pend_nonpost
+ pend_post
;
1983 trace_migrate_pending(pending_size
, threshold_size
,
1984 pend_post
, pend_nonpost
);
1985 if (pending_size
&& pending_size
>= threshold_size
) {
1986 /* Still a significant amount to transfer */
1988 if (migrate_postcopy_ram() &&
1989 s
->state
!= MIGRATION_STATUS_POSTCOPY_ACTIVE
&&
1990 pend_nonpost
<= threshold_size
&&
1991 atomic_read(&s
->start_postcopy
)) {
1993 if (!postcopy_start(s
, &old_vm_running
)) {
1994 current_active_state
= MIGRATION_STATUS_POSTCOPY_ACTIVE
;
1995 entered_postcopy
= true;
2000 /* Just another iteration step */
2001 qemu_savevm_state_iterate(s
->to_dst_file
, entered_postcopy
);
2003 trace_migration_thread_low_pending(pending_size
);
2004 migration_completion(s
, current_active_state
,
2005 &old_vm_running
, &start_time
);
2010 if (qemu_file_get_error(s
->to_dst_file
)) {
2011 migrate_set_state(&s
->state
, current_active_state
,
2012 MIGRATION_STATUS_FAILED
);
2013 trace_migration_thread_file_err();
2016 current_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2017 if (current_time
>= initial_time
+ BUFFER_DELAY
) {
2018 uint64_t transferred_bytes
= qemu_ftell(s
->to_dst_file
) -
2020 uint64_t time_spent
= current_time
- initial_time
;
2021 double bandwidth
= (double)transferred_bytes
/ time_spent
;
2022 threshold_size
= bandwidth
* s
->parameters
.downtime_limit
;
2024 s
->mbps
= (((double) transferred_bytes
* 8.0) /
2025 ((double) time_spent
/ 1000.0)) / 1000.0 / 1000.0;
2027 trace_migrate_transferred(transferred_bytes
, time_spent
,
2028 bandwidth
, threshold_size
);
2029 /* if we haven't sent anything, we don't want to recalculate
2030 10000 is a small enough number for our purposes */
2031 if (ram_counters
.dirty_pages_rate
&& transferred_bytes
> 10000) {
2032 s
->expected_downtime
= ram_counters
.dirty_pages_rate
*
2033 qemu_target_page_size() / bandwidth
;
2036 qemu_file_reset_rate_limit(s
->to_dst_file
);
2037 initial_time
= current_time
;
2038 initial_bytes
= qemu_ftell(s
->to_dst_file
);
2040 if (qemu_file_rate_limit(s
->to_dst_file
)) {
2041 /* usleep expects microseconds */
2042 g_usleep((initial_time
+ BUFFER_DELAY
- current_time
)*1000);
2046 trace_migration_thread_after_loop();
2047 /* If we enabled cpu throttling for auto-converge, turn it off. */
2048 cpu_throttle_stop();
2049 end_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2051 qemu_mutex_lock_iothread();
2053 * The resource has been allocated by migration will be reused in COLO
2054 * process, so don't release them.
2057 qemu_savevm_state_cleanup();
2059 if (s
->state
== MIGRATION_STATUS_COMPLETED
) {
2060 uint64_t transferred_bytes
= qemu_ftell(s
->to_dst_file
);
2061 s
->total_time
= end_time
- s
->total_time
;
2062 if (!entered_postcopy
) {
2063 s
->downtime
= end_time
- start_time
;
2065 if (s
->total_time
) {
2066 s
->mbps
= (((double) transferred_bytes
* 8.0) /
2067 ((double) s
->total_time
)) / 1000;
2069 runstate_set(RUN_STATE_POSTMIGRATE
);
2071 if (s
->state
== MIGRATION_STATUS_ACTIVE
&& enable_colo
) {
2072 migrate_start_colo_process(s
);
2073 qemu_savevm_state_cleanup();
2075 * Fixme: we will run VM in COLO no matter its old running state.
2076 * After exited COLO, we will keep running.
2078 old_vm_running
= true;
2080 if (old_vm_running
&& !entered_postcopy
) {
2083 if (runstate_check(RUN_STATE_FINISH_MIGRATE
)) {
2084 runstate_set(RUN_STATE_POSTMIGRATE
);
2088 qemu_bh_schedule(s
->cleanup_bh
);
2089 qemu_mutex_unlock_iothread();
2091 rcu_unregister_thread();
2095 void migrate_fd_connect(MigrationState
*s
)
2097 s
->expected_downtime
= s
->parameters
.downtime_limit
;
2098 s
->cleanup_bh
= qemu_bh_new(migrate_fd_cleanup
, s
);
2100 qemu_file_set_blocking(s
->to_dst_file
, true);
2101 qemu_file_set_rate_limit(s
->to_dst_file
,
2102 s
->parameters
.max_bandwidth
/ XFER_LIMIT_RATIO
);
2104 /* Notify before starting migration thread */
2105 notifier_list_notify(&migration_state_notifiers
, s
);
2108 * Open the return path. For postcopy, it is used exclusively. For
2109 * precopy, only if user specified "return-path" capability would
2110 * QEMU uses the return path.
2112 if (migrate_postcopy_ram() || migrate_use_return_path()) {
2113 if (open_return_path_on_source(s
)) {
2114 error_report("Unable to open return-path for postcopy");
2115 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
2116 MIGRATION_STATUS_FAILED
);
2117 migrate_fd_cleanup(s
);
2122 qemu_thread_create(&s
->thread
, "live_migration", migration_thread
, s
,
2123 QEMU_THREAD_JOINABLE
);
2124 s
->migration_thread_running
= true;
2127 void migration_global_dump(Monitor
*mon
)
2129 MigrationState
*ms
= migrate_get_current();
2131 monitor_printf(mon
, "globals: store-global-state=%d, only_migratable=%d, "
2132 "send-configuration=%d, send-section-footer=%d\n",
2133 ms
->store_global_state
, ms
->only_migratable
,
2134 ms
->send_configuration
, ms
->send_section_footer
);
2137 #define DEFINE_PROP_MIG_CAP(name, x) \
2138 DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
2140 static Property migration_properties
[] = {
2141 DEFINE_PROP_BOOL("store-global-state", MigrationState
,
2142 store_global_state
, true),
2143 DEFINE_PROP_BOOL("only-migratable", MigrationState
, only_migratable
, false),
2144 DEFINE_PROP_BOOL("send-configuration", MigrationState
,
2145 send_configuration
, true),
2146 DEFINE_PROP_BOOL("send-section-footer", MigrationState
,
2147 send_section_footer
, true),
2149 /* Migration parameters */
2150 DEFINE_PROP_INT64("x-compress-level", MigrationState
,
2151 parameters
.compress_level
,
2152 DEFAULT_MIGRATE_COMPRESS_LEVEL
),
2153 DEFINE_PROP_INT64("x-compress-threads", MigrationState
,
2154 parameters
.compress_threads
,
2155 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT
),
2156 DEFINE_PROP_INT64("x-decompress-threads", MigrationState
,
2157 parameters
.decompress_threads
,
2158 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT
),
2159 DEFINE_PROP_INT64("x-cpu-throttle-initial", MigrationState
,
2160 parameters
.cpu_throttle_initial
,
2161 DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL
),
2162 DEFINE_PROP_INT64("x-cpu-throttle-increment", MigrationState
,
2163 parameters
.cpu_throttle_increment
,
2164 DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT
),
2165 DEFINE_PROP_INT64("x-max-bandwidth", MigrationState
,
2166 parameters
.max_bandwidth
, MAX_THROTTLE
),
2167 DEFINE_PROP_INT64("x-downtime-limit", MigrationState
,
2168 parameters
.downtime_limit
,
2169 DEFAULT_MIGRATE_SET_DOWNTIME
),
2170 DEFINE_PROP_INT64("x-checkpoint-delay", MigrationState
,
2171 parameters
.x_checkpoint_delay
,
2172 DEFAULT_MIGRATE_X_CHECKPOINT_DELAY
),
2174 /* Migration capabilities */
2175 DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE
),
2176 DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL
),
2177 DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE
),
2178 DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS
),
2179 DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS
),
2180 DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS
),
2181 DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM
),
2182 DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO
),
2183 DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM
),
2184 DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK
),
2185 DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH
),
2187 DEFINE_PROP_END_OF_LIST(),
2190 static void migration_class_init(ObjectClass
*klass
, void *data
)
2192 DeviceClass
*dc
= DEVICE_CLASS(klass
);
2194 dc
->user_creatable
= false;
2195 dc
->props
= migration_properties
;
2198 static void migration_instance_init(Object
*obj
)
2200 MigrationState
*ms
= MIGRATION_OBJ(obj
);
2201 MigrationParameters
*params
= &ms
->parameters
;
2203 ms
->state
= MIGRATION_STATUS_NONE
;
2204 ms
->xbzrle_cache_size
= DEFAULT_MIGRATE_CACHE_SIZE
;
2207 params
->tls_hostname
= g_strdup("");
2208 params
->tls_creds
= g_strdup("");
2210 /* Set has_* up only for parameter checks */
2211 params
->has_compress_level
= true;
2212 params
->has_compress_threads
= true;
2213 params
->has_decompress_threads
= true;
2214 params
->has_cpu_throttle_initial
= true;
2215 params
->has_cpu_throttle_increment
= true;
2216 params
->has_max_bandwidth
= true;
2217 params
->has_downtime_limit
= true;
2218 params
->has_x_checkpoint_delay
= true;
2219 params
->has_block_incremental
= true;
2223 * Return true if check pass, false otherwise. Error will be put
2224 * inside errp if provided.
2226 static bool migration_object_check(MigrationState
*ms
, Error
**errp
)
2228 MigrationCapabilityStatusList
*head
= NULL
;
2229 /* Assuming all off */
2230 bool cap_list
[MIGRATION_CAPABILITY__MAX
] = { 0 }, ret
;
2233 if (!migrate_params_check(&ms
->parameters
, errp
)) {
2237 for (i
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
2238 if (ms
->enabled_capabilities
[i
]) {
2239 head
= migrate_cap_add(head
, i
, true);
2243 ret
= migrate_caps_check(cap_list
, head
, errp
);
2245 /* It works with head == NULL */
2246 qapi_free_MigrationCapabilityStatusList(head
);
2251 static const TypeInfo migration_type
= {
2252 .name
= TYPE_MIGRATION
,
2254 * NOTE: TYPE_MIGRATION is not really a device, as the object is
2255 * not created using qdev_create(), it is not attached to the qdev
2256 * device tree, and it is never realized.
2258 * TODO: Make this TYPE_OBJECT once QOM provides something like
2259 * TYPE_DEVICE's "-global" properties.
2261 .parent
= TYPE_DEVICE
,
2262 .class_init
= migration_class_init
,
2263 .class_size
= sizeof(MigrationClass
),
2264 .instance_size
= sizeof(MigrationState
),
2265 .instance_init
= migration_instance_init
,
2268 static void register_migration_types(void)
2270 type_register_static(&migration_type
);
2273 type_init(register_migration_types
);