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/error.h"
34 #include "qapi/qapi-commands-migration.h"
35 #include "qapi/qapi-events-migration.h"
36 #include "qapi/qmp/qerror.h"
37 #include "qapi/qmp/qnull.h"
40 #include "postcopy-ram.h"
41 #include "qemu/thread.h"
43 #include "exec/target_page.h"
44 #include "io/channel-buffer.h"
45 #include "migration/colo.h"
46 #include "hw/boards.h"
47 #include "monitor/monitor.h"
49 #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */
51 /* Amount of time to allocate to each "chunk" of bandwidth-throttled
53 #define BUFFER_DELAY 100
54 #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
56 /* Time in milliseconds we are allowed to stop the source,
57 * for sending the last part */
58 #define DEFAULT_MIGRATE_SET_DOWNTIME 300
60 /* Maximum migrate downtime set to 2000 seconds */
61 #define MAX_MIGRATE_DOWNTIME_SECONDS 2000
62 #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
64 /* Default compression thread count */
65 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
66 /* Default decompression thread count, usually decompression is at
67 * least 4 times as fast as compression.*/
68 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
69 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */
70 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
71 /* Define default autoconverge cpu throttle migration parameters */
72 #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
73 #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
75 /* Migration XBZRLE default cache size */
76 #define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
78 /* The delay time (in ms) between two COLO checkpoints
79 * Note: Please change this default value to 10000 when we support hybrid mode.
81 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200
82 #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
83 #define DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT 16
85 static NotifierList migration_state_notifiers
=
86 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers
);
88 static bool deferred_incoming
;
90 /* Messages sent on the return path from destination to source */
91 enum mig_rp_message_type
{
92 MIG_RP_MSG_INVALID
= 0, /* Must be 0 */
93 MIG_RP_MSG_SHUT
, /* sibling will not send any more RP messages */
94 MIG_RP_MSG_PONG
, /* Response to a PING; data (seq: be32 ) */
96 MIG_RP_MSG_REQ_PAGES_ID
, /* data (start: be64, len: be32, id: string) */
97 MIG_RP_MSG_REQ_PAGES
, /* data (start: be64, len: be32) */
98 MIG_RP_MSG_RECV_BITMAP
, /* send recved_bitmap back to source */
99 MIG_RP_MSG_RESUME_ACK
, /* tell source that we are ready to resume */
104 /* When we add fault tolerance, we could have several
105 migrations at once. For now we don't need to add
106 dynamic creation of migration */
108 static MigrationState
*current_migration
;
110 static bool migration_object_check(MigrationState
*ms
, Error
**errp
);
111 static int migration_maybe_pause(MigrationState
*s
,
112 int *current_active_state
,
115 void migration_object_init(void)
117 MachineState
*ms
= MACHINE(qdev_get_machine());
120 /* This can only be called once. */
121 assert(!current_migration
);
122 current_migration
= MIGRATION_OBJ(object_new(TYPE_MIGRATION
));
124 if (!migration_object_check(current_migration
, &err
)) {
125 error_report_err(err
);
130 * We cannot really do this in migration_instance_init() since at
131 * that time global properties are not yet applied, then this
132 * value will be definitely replaced by something else.
134 if (ms
->enforce_config_section
) {
135 current_migration
->send_configuration
= true;
139 void migration_object_finalize(void)
141 object_unref(OBJECT(current_migration
));
145 MigrationState
*migrate_get_current(void)
147 /* This can only be called after the object created. */
148 assert(current_migration
);
149 return current_migration
;
152 MigrationIncomingState
*migration_incoming_get_current(void)
155 static MigrationIncomingState mis_current
;
158 mis_current
.state
= MIGRATION_STATUS_NONE
;
159 memset(&mis_current
, 0, sizeof(MigrationIncomingState
));
160 mis_current
.postcopy_remote_fds
= g_array_new(FALSE
, TRUE
,
161 sizeof(struct PostCopyFD
));
162 qemu_mutex_init(&mis_current
.rp_mutex
);
163 qemu_event_init(&mis_current
.main_thread_load_event
, false);
164 qemu_sem_init(&mis_current
.postcopy_pause_sem_dst
, 0);
165 qemu_sem_init(&mis_current
.postcopy_pause_sem_fault
, 0);
167 init_dirty_bitmap_incoming_migration();
174 void migration_incoming_state_destroy(void)
176 struct MigrationIncomingState
*mis
= migration_incoming_get_current();
178 if (mis
->to_src_file
) {
179 /* Tell source that we are done */
180 migrate_send_rp_shut(mis
, qemu_file_get_error(mis
->from_src_file
) != 0);
181 qemu_fclose(mis
->to_src_file
);
182 mis
->to_src_file
= NULL
;
185 if (mis
->from_src_file
) {
186 qemu_fclose(mis
->from_src_file
);
187 mis
->from_src_file
= NULL
;
189 if (mis
->postcopy_remote_fds
) {
190 g_array_free(mis
->postcopy_remote_fds
, TRUE
);
191 mis
->postcopy_remote_fds
= NULL
;
194 qemu_event_reset(&mis
->main_thread_load_event
);
197 static void migrate_generate_event(int new_state
)
199 if (migrate_use_events()) {
200 qapi_event_send_migration(new_state
, &error_abort
);
205 * Called on -incoming with a defer: uri.
206 * The migration can be started later after any parameters have been
209 static void deferred_incoming_migration(Error
**errp
)
211 if (deferred_incoming
) {
212 error_setg(errp
, "Incoming migration already deferred");
214 deferred_incoming
= true;
218 * Send a message on the return channel back to the source
221 static int migrate_send_rp_message(MigrationIncomingState
*mis
,
222 enum mig_rp_message_type message_type
,
223 uint16_t len
, void *data
)
227 trace_migrate_send_rp_message((int)message_type
, len
);
228 qemu_mutex_lock(&mis
->rp_mutex
);
231 * It's possible that the file handle got lost due to network
234 if (!mis
->to_src_file
) {
239 qemu_put_be16(mis
->to_src_file
, (unsigned int)message_type
);
240 qemu_put_be16(mis
->to_src_file
, len
);
241 qemu_put_buffer(mis
->to_src_file
, data
, len
);
242 qemu_fflush(mis
->to_src_file
);
244 /* It's possible that qemu file got error during sending */
245 ret
= qemu_file_get_error(mis
->to_src_file
);
248 qemu_mutex_unlock(&mis
->rp_mutex
);
252 /* Request a range of pages from the source VM at the given
254 * rbname: Name of the RAMBlock to request the page in, if NULL it's the same
255 * as the last request (a name must have been given previously)
256 * Start: Address offset within the RB
257 * Len: Length in bytes required - must be a multiple of pagesize
259 int migrate_send_rp_req_pages(MigrationIncomingState
*mis
, const char *rbname
,
260 ram_addr_t start
, size_t len
)
262 uint8_t bufc
[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */
263 size_t msglen
= 12; /* start + len */
264 enum mig_rp_message_type msg_type
;
266 *(uint64_t *)bufc
= cpu_to_be64((uint64_t)start
);
267 *(uint32_t *)(bufc
+ 8) = cpu_to_be32((uint32_t)len
);
270 int rbname_len
= strlen(rbname
);
271 assert(rbname_len
< 256);
273 bufc
[msglen
++] = rbname_len
;
274 memcpy(bufc
+ msglen
, rbname
, rbname_len
);
275 msglen
+= rbname_len
;
276 msg_type
= MIG_RP_MSG_REQ_PAGES_ID
;
278 msg_type
= MIG_RP_MSG_REQ_PAGES
;
281 return migrate_send_rp_message(mis
, msg_type
, msglen
, bufc
);
284 void qemu_start_incoming_migration(const char *uri
, Error
**errp
)
288 qapi_event_send_migration(MIGRATION_STATUS_SETUP
, &error_abort
);
289 if (!strcmp(uri
, "defer")) {
290 deferred_incoming_migration(errp
);
291 } else if (strstart(uri
, "tcp:", &p
)) {
292 tcp_start_incoming_migration(p
, errp
);
294 } else if (strstart(uri
, "rdma:", &p
)) {
295 rdma_start_incoming_migration(p
, errp
);
297 } else if (strstart(uri
, "exec:", &p
)) {
298 exec_start_incoming_migration(p
, errp
);
299 } else if (strstart(uri
, "unix:", &p
)) {
300 unix_start_incoming_migration(p
, errp
);
301 } else if (strstart(uri
, "fd:", &p
)) {
302 fd_start_incoming_migration(p
, errp
);
304 error_setg(errp
, "unknown migration protocol: %s", uri
);
308 static void process_incoming_migration_bh(void *opaque
)
310 Error
*local_err
= NULL
;
311 MigrationIncomingState
*mis
= opaque
;
313 /* Make sure all file formats flush their mutable metadata.
314 * If we get an error here, just don't restart the VM yet. */
315 bdrv_invalidate_cache_all(&local_err
);
317 error_report_err(local_err
);
323 * This must happen after all error conditions are dealt with and
324 * we're sure the VM is going to be running on this host.
326 qemu_announce_self();
328 if (multifd_load_cleanup(&local_err
) != 0) {
329 error_report_err(local_err
);
332 /* If global state section was not received or we are in running
333 state, we need to obey autostart. Any other state is set with
336 dirty_bitmap_mig_before_vm_start();
338 if (!global_state_received() ||
339 global_state_get_runstate() == RUN_STATE_RUNNING
) {
343 runstate_set(RUN_STATE_PAUSED
);
346 runstate_set(global_state_get_runstate());
349 * This must happen after any state changes since as soon as an external
350 * observer sees this event they might start to prod at the VM assuming
353 migrate_set_state(&mis
->state
, MIGRATION_STATUS_ACTIVE
,
354 MIGRATION_STATUS_COMPLETED
);
355 qemu_bh_delete(mis
->bh
);
356 migration_incoming_state_destroy();
359 static void process_incoming_migration_co(void *opaque
)
361 MigrationIncomingState
*mis
= migration_incoming_get_current();
365 assert(mis
->from_src_file
);
366 mis
->largest_page_size
= qemu_ram_pagesize_largest();
367 postcopy_state_set(POSTCOPY_INCOMING_NONE
);
368 migrate_set_state(&mis
->state
, MIGRATION_STATUS_NONE
,
369 MIGRATION_STATUS_ACTIVE
);
370 ret
= qemu_loadvm_state(mis
->from_src_file
);
372 ps
= postcopy_state_get();
373 trace_process_incoming_migration_co_end(ret
, ps
);
374 if (ps
!= POSTCOPY_INCOMING_NONE
) {
375 if (ps
== POSTCOPY_INCOMING_ADVISE
) {
377 * Where a migration had postcopy enabled (and thus went to advise)
378 * but managed to complete within the precopy period, we can use
381 postcopy_ram_incoming_cleanup(mis
);
382 } else if (ret
>= 0) {
384 * Postcopy was started, cleanup should happen at the end of the
387 trace_process_incoming_migration_co_postcopy_end_main();
390 /* Else if something went wrong then just fall out of the normal exit */
393 /* we get COLO info, and know if we are in COLO mode */
394 if (!ret
&& migration_incoming_enable_colo()) {
395 mis
->migration_incoming_co
= qemu_coroutine_self();
396 qemu_thread_create(&mis
->colo_incoming_thread
, "COLO incoming",
397 colo_process_incoming_thread
, mis
, QEMU_THREAD_JOINABLE
);
398 mis
->have_colo_incoming_thread
= true;
399 qemu_coroutine_yield();
401 /* Wait checkpoint incoming thread exit before free resource */
402 qemu_thread_join(&mis
->colo_incoming_thread
);
406 Error
*local_err
= NULL
;
408 migrate_set_state(&mis
->state
, MIGRATION_STATUS_ACTIVE
,
409 MIGRATION_STATUS_FAILED
);
410 error_report("load of migration failed: %s", strerror(-ret
));
411 qemu_fclose(mis
->from_src_file
);
412 if (multifd_load_cleanup(&local_err
) != 0) {
413 error_report_err(local_err
);
417 mis
->bh
= qemu_bh_new(process_incoming_migration_bh
, mis
);
418 qemu_bh_schedule(mis
->bh
);
421 static void migration_incoming_setup(QEMUFile
*f
)
423 MigrationIncomingState
*mis
= migration_incoming_get_current();
425 if (multifd_load_setup() != 0) {
426 /* We haven't been able to create multifd threads
427 nothing better to do */
431 if (!mis
->from_src_file
) {
432 mis
->from_src_file
= f
;
434 qemu_file_set_blocking(f
, false);
437 void migration_incoming_process(void)
439 Coroutine
*co
= qemu_coroutine_create(process_incoming_migration_co
, NULL
);
440 qemu_coroutine_enter(co
);
443 void migration_fd_process_incoming(QEMUFile
*f
)
445 MigrationIncomingState
*mis
= migration_incoming_get_current();
447 if (mis
->state
== MIGRATION_STATUS_POSTCOPY_PAUSED
) {
448 /* Resumed from a paused postcopy migration */
450 mis
->from_src_file
= f
;
451 /* Postcopy has standalone thread to do vm load */
452 qemu_file_set_blocking(f
, true);
454 /* Re-configure the return path */
455 mis
->to_src_file
= qemu_file_get_return_path(f
);
457 migrate_set_state(&mis
->state
, MIGRATION_STATUS_POSTCOPY_PAUSED
,
458 MIGRATION_STATUS_POSTCOPY_RECOVER
);
461 * Here, we only wake up the main loading thread (while the
462 * fault thread will still be waiting), so that we can receive
463 * commands from source now, and answer it if needed. The
464 * fault thread will be woken up afterwards until we are sure
465 * that source is ready to reply to page requests.
467 qemu_sem_post(&mis
->postcopy_pause_sem_dst
);
469 /* New incoming migration */
470 migration_incoming_setup(f
);
471 migration_incoming_process();
475 void migration_ioc_process_incoming(QIOChannel
*ioc
)
477 MigrationIncomingState
*mis
= migration_incoming_get_current();
479 if (!mis
->from_src_file
) {
480 QEMUFile
*f
= qemu_fopen_channel_input(ioc
);
481 migration_incoming_setup(f
);
484 multifd_recv_new_channel(ioc
);
488 * @migration_has_all_channels: We have received all channels that we need
490 * Returns true when we have got connections to all the channels that
491 * we need for migration.
493 bool migration_has_all_channels(void)
497 all_channels
= multifd_recv_all_channels_created();
503 * Send a 'SHUT' message on the return channel with the given value
504 * to indicate that we've finished with the RP. Non-0 value indicates
507 void migrate_send_rp_shut(MigrationIncomingState
*mis
,
512 buf
= cpu_to_be32(value
);
513 migrate_send_rp_message(mis
, MIG_RP_MSG_SHUT
, sizeof(buf
), &buf
);
517 * Send a 'PONG' message on the return channel with the given value
518 * (normally in response to a 'PING')
520 void migrate_send_rp_pong(MigrationIncomingState
*mis
,
525 buf
= cpu_to_be32(value
);
526 migrate_send_rp_message(mis
, MIG_RP_MSG_PONG
, sizeof(buf
), &buf
);
529 void migrate_send_rp_recv_bitmap(MigrationIncomingState
*mis
,
537 * First, we send the header part. It contains only the len of
538 * idstr, and the idstr itself.
540 len
= strlen(block_name
);
542 memcpy(buf
+ 1, block_name
, len
);
544 if (mis
->state
!= MIGRATION_STATUS_POSTCOPY_RECOVER
) {
545 error_report("%s: MSG_RP_RECV_BITMAP only used for recovery",
550 migrate_send_rp_message(mis
, MIG_RP_MSG_RECV_BITMAP
, len
+ 1, buf
);
553 * Next, we dump the received bitmap to the stream.
555 * TODO: currently we are safe since we are the only one that is
556 * using the to_src_file handle (fault thread is still paused),
557 * and it's ok even not taking the mutex. However the best way is
558 * to take the lock before sending the message header, and release
559 * the lock after sending the bitmap.
561 qemu_mutex_lock(&mis
->rp_mutex
);
562 res
= ramblock_recv_bitmap_send(mis
->to_src_file
, block_name
);
563 qemu_mutex_unlock(&mis
->rp_mutex
);
565 trace_migrate_send_rp_recv_bitmap(block_name
, res
);
568 void migrate_send_rp_resume_ack(MigrationIncomingState
*mis
, uint32_t value
)
572 buf
= cpu_to_be32(value
);
573 migrate_send_rp_message(mis
, MIG_RP_MSG_RESUME_ACK
, sizeof(buf
), &buf
);
576 MigrationCapabilityStatusList
*qmp_query_migrate_capabilities(Error
**errp
)
578 MigrationCapabilityStatusList
*head
= NULL
;
579 MigrationCapabilityStatusList
*caps
;
580 MigrationState
*s
= migrate_get_current();
583 caps
= NULL
; /* silence compiler warning */
584 for (i
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
585 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
586 if (i
== MIGRATION_CAPABILITY_BLOCK
) {
591 head
= g_malloc0(sizeof(*caps
));
594 caps
->next
= g_malloc0(sizeof(*caps
));
598 g_malloc(sizeof(*caps
->value
));
599 caps
->value
->capability
= i
;
600 caps
->value
->state
= s
->enabled_capabilities
[i
];
606 MigrationParameters
*qmp_query_migrate_parameters(Error
**errp
)
608 MigrationParameters
*params
;
609 MigrationState
*s
= migrate_get_current();
611 /* TODO use QAPI_CLONE() instead of duplicating it inline */
612 params
= g_malloc0(sizeof(*params
));
613 params
->has_compress_level
= true;
614 params
->compress_level
= s
->parameters
.compress_level
;
615 params
->has_compress_threads
= true;
616 params
->compress_threads
= s
->parameters
.compress_threads
;
617 params
->has_decompress_threads
= true;
618 params
->decompress_threads
= s
->parameters
.decompress_threads
;
619 params
->has_cpu_throttle_initial
= true;
620 params
->cpu_throttle_initial
= s
->parameters
.cpu_throttle_initial
;
621 params
->has_cpu_throttle_increment
= true;
622 params
->cpu_throttle_increment
= s
->parameters
.cpu_throttle_increment
;
623 params
->has_tls_creds
= true;
624 params
->tls_creds
= g_strdup(s
->parameters
.tls_creds
);
625 params
->has_tls_hostname
= true;
626 params
->tls_hostname
= g_strdup(s
->parameters
.tls_hostname
);
627 params
->has_max_bandwidth
= true;
628 params
->max_bandwidth
= s
->parameters
.max_bandwidth
;
629 params
->has_downtime_limit
= true;
630 params
->downtime_limit
= s
->parameters
.downtime_limit
;
631 params
->has_x_checkpoint_delay
= true;
632 params
->x_checkpoint_delay
= s
->parameters
.x_checkpoint_delay
;
633 params
->has_block_incremental
= true;
634 params
->block_incremental
= s
->parameters
.block_incremental
;
635 params
->has_x_multifd_channels
= true;
636 params
->x_multifd_channels
= s
->parameters
.x_multifd_channels
;
637 params
->has_x_multifd_page_count
= true;
638 params
->x_multifd_page_count
= s
->parameters
.x_multifd_page_count
;
639 params
->has_xbzrle_cache_size
= true;
640 params
->xbzrle_cache_size
= s
->parameters
.xbzrle_cache_size
;
646 * Return true if we're already in the middle of a migration
647 * (i.e. any of the active or setup states)
649 static bool migration_is_setup_or_active(int state
)
652 case MIGRATION_STATUS_ACTIVE
:
653 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
654 case MIGRATION_STATUS_POSTCOPY_PAUSED
:
655 case MIGRATION_STATUS_POSTCOPY_RECOVER
:
656 case MIGRATION_STATUS_SETUP
:
657 case MIGRATION_STATUS_PRE_SWITCHOVER
:
658 case MIGRATION_STATUS_DEVICE
:
667 static void populate_ram_info(MigrationInfo
*info
, MigrationState
*s
)
669 info
->has_ram
= true;
670 info
->ram
= g_malloc0(sizeof(*info
->ram
));
671 info
->ram
->transferred
= ram_counters
.transferred
;
672 info
->ram
->total
= ram_bytes_total();
673 info
->ram
->duplicate
= ram_counters
.duplicate
;
674 /* legacy value. It is not used anymore */
675 info
->ram
->skipped
= 0;
676 info
->ram
->normal
= ram_counters
.normal
;
677 info
->ram
->normal_bytes
= ram_counters
.normal
*
678 qemu_target_page_size();
679 info
->ram
->mbps
= s
->mbps
;
680 info
->ram
->dirty_sync_count
= ram_counters
.dirty_sync_count
;
681 info
->ram
->postcopy_requests
= ram_counters
.postcopy_requests
;
682 info
->ram
->page_size
= qemu_target_page_size();
684 if (migrate_use_xbzrle()) {
685 info
->has_xbzrle_cache
= true;
686 info
->xbzrle_cache
= g_malloc0(sizeof(*info
->xbzrle_cache
));
687 info
->xbzrle_cache
->cache_size
= migrate_xbzrle_cache_size();
688 info
->xbzrle_cache
->bytes
= xbzrle_counters
.bytes
;
689 info
->xbzrle_cache
->pages
= xbzrle_counters
.pages
;
690 info
->xbzrle_cache
->cache_miss
= xbzrle_counters
.cache_miss
;
691 info
->xbzrle_cache
->cache_miss_rate
= xbzrle_counters
.cache_miss_rate
;
692 info
->xbzrle_cache
->overflow
= xbzrle_counters
.overflow
;
695 if (cpu_throttle_active()) {
696 info
->has_cpu_throttle_percentage
= true;
697 info
->cpu_throttle_percentage
= cpu_throttle_get_percentage();
700 if (s
->state
!= MIGRATION_STATUS_COMPLETED
) {
701 info
->ram
->remaining
= ram_bytes_remaining();
702 info
->ram
->dirty_pages_rate
= ram_counters
.dirty_pages_rate
;
706 static void populate_disk_info(MigrationInfo
*info
)
708 if (blk_mig_active()) {
709 info
->has_disk
= true;
710 info
->disk
= g_malloc0(sizeof(*info
->disk
));
711 info
->disk
->transferred
= blk_mig_bytes_transferred();
712 info
->disk
->remaining
= blk_mig_bytes_remaining();
713 info
->disk
->total
= blk_mig_bytes_total();
717 static void fill_source_migration_info(MigrationInfo
*info
)
719 MigrationState
*s
= migrate_get_current();
722 case MIGRATION_STATUS_NONE
:
723 /* no migration has happened ever */
724 /* do not overwrite destination migration status */
727 case MIGRATION_STATUS_SETUP
:
728 info
->has_status
= true;
729 info
->has_total_time
= false;
731 case MIGRATION_STATUS_ACTIVE
:
732 case MIGRATION_STATUS_CANCELLING
:
733 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
734 case MIGRATION_STATUS_PRE_SWITCHOVER
:
735 case MIGRATION_STATUS_DEVICE
:
736 case MIGRATION_STATUS_POSTCOPY_PAUSED
:
737 case MIGRATION_STATUS_POSTCOPY_RECOVER
:
738 /* TODO add some postcopy stats */
739 info
->has_status
= true;
740 info
->has_total_time
= true;
741 info
->total_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
)
743 info
->has_expected_downtime
= true;
744 info
->expected_downtime
= s
->expected_downtime
;
745 info
->has_setup_time
= true;
746 info
->setup_time
= s
->setup_time
;
748 populate_ram_info(info
, s
);
749 populate_disk_info(info
);
751 case MIGRATION_STATUS_COLO
:
752 info
->has_status
= true;
753 /* TODO: display COLO specific information (checkpoint info etc.) */
755 case MIGRATION_STATUS_COMPLETED
:
756 info
->has_status
= true;
757 info
->has_total_time
= true;
758 info
->total_time
= s
->total_time
;
759 info
->has_downtime
= true;
760 info
->downtime
= s
->downtime
;
761 info
->has_setup_time
= true;
762 info
->setup_time
= s
->setup_time
;
764 populate_ram_info(info
, s
);
766 case MIGRATION_STATUS_FAILED
:
767 info
->has_status
= true;
769 info
->has_error_desc
= true;
770 info
->error_desc
= g_strdup(error_get_pretty(s
->error
));
773 case MIGRATION_STATUS_CANCELLED
:
774 info
->has_status
= true;
777 info
->status
= s
->state
;
781 * @migration_caps_check - check capability validity
783 * @cap_list: old capability list, array of bool
784 * @params: new capabilities to be applied soon
785 * @errp: set *errp if the check failed, with reason
787 * Returns true if check passed, otherwise false.
789 static bool migrate_caps_check(bool *cap_list
,
790 MigrationCapabilityStatusList
*params
,
793 MigrationCapabilityStatusList
*cap
;
794 bool old_postcopy_cap
;
795 MigrationIncomingState
*mis
= migration_incoming_get_current();
797 old_postcopy_cap
= cap_list
[MIGRATION_CAPABILITY_POSTCOPY_RAM
];
799 for (cap
= params
; cap
; cap
= cap
->next
) {
800 cap_list
[cap
->value
->capability
] = cap
->value
->state
;
803 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
804 if (cap_list
[MIGRATION_CAPABILITY_BLOCK
]) {
805 error_setg(errp
, "QEMU compiled without old-style (blk/-b, inc/-i) "
807 error_append_hint(errp
, "Use drive_mirror+NBD instead.\n");
812 if (cap_list
[MIGRATION_CAPABILITY_POSTCOPY_RAM
]) {
813 if (cap_list
[MIGRATION_CAPABILITY_COMPRESS
]) {
814 /* The decompression threads asynchronously write into RAM
815 * rather than use the atomic copies needed to avoid
816 * userfaulting. It should be possible to fix the decompression
817 * threads for compatibility in future.
819 error_setg(errp
, "Postcopy is not currently compatible "
824 /* This check is reasonably expensive, so only when it's being
825 * set the first time, also it's only the destination that needs
828 if (!old_postcopy_cap
&& runstate_check(RUN_STATE_INMIGRATE
) &&
829 !postcopy_ram_supported_by_host(mis
)) {
830 /* postcopy_ram_supported_by_host will have emitted a more
833 error_setg(errp
, "Postcopy is not supported");
841 static void fill_destination_migration_info(MigrationInfo
*info
)
843 MigrationIncomingState
*mis
= migration_incoming_get_current();
845 switch (mis
->state
) {
846 case MIGRATION_STATUS_NONE
:
849 case MIGRATION_STATUS_SETUP
:
850 case MIGRATION_STATUS_CANCELLING
:
851 case MIGRATION_STATUS_CANCELLED
:
852 case MIGRATION_STATUS_ACTIVE
:
853 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
854 case MIGRATION_STATUS_FAILED
:
855 case MIGRATION_STATUS_COLO
:
856 info
->has_status
= true;
858 case MIGRATION_STATUS_COMPLETED
:
859 info
->has_status
= true;
860 fill_destination_postcopy_migration_info(info
);
863 info
->status
= mis
->state
;
866 MigrationInfo
*qmp_query_migrate(Error
**errp
)
868 MigrationInfo
*info
= g_malloc0(sizeof(*info
));
870 fill_destination_migration_info(info
);
871 fill_source_migration_info(info
);
876 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList
*params
,
879 MigrationState
*s
= migrate_get_current();
880 MigrationCapabilityStatusList
*cap
;
881 bool cap_list
[MIGRATION_CAPABILITY__MAX
];
883 if (migration_is_setup_or_active(s
->state
)) {
884 error_setg(errp
, QERR_MIGRATION_ACTIVE
);
888 memcpy(cap_list
, s
->enabled_capabilities
, sizeof(cap_list
));
889 if (!migrate_caps_check(cap_list
, params
, errp
)) {
893 for (cap
= params
; cap
; cap
= cap
->next
) {
894 s
->enabled_capabilities
[cap
->value
->capability
] = cap
->value
->state
;
899 * Check whether the parameters are valid. Error will be put into errp
900 * (if provided). Return true if valid, otherwise false.
902 static bool migrate_params_check(MigrationParameters
*params
, Error
**errp
)
904 if (params
->has_compress_level
&&
905 (params
->compress_level
> 9)) {
906 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "compress_level",
907 "is invalid, it should be in the range of 0 to 9");
911 if (params
->has_compress_threads
&& (params
->compress_threads
< 1)) {
912 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
914 "is invalid, it should be in the range of 1 to 255");
918 if (params
->has_decompress_threads
&& (params
->decompress_threads
< 1)) {
919 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
920 "decompress_threads",
921 "is invalid, it should be in the range of 1 to 255");
925 if (params
->has_cpu_throttle_initial
&&
926 (params
->cpu_throttle_initial
< 1 ||
927 params
->cpu_throttle_initial
> 99)) {
928 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
929 "cpu_throttle_initial",
930 "an integer in the range of 1 to 99");
934 if (params
->has_cpu_throttle_increment
&&
935 (params
->cpu_throttle_increment
< 1 ||
936 params
->cpu_throttle_increment
> 99)) {
937 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
938 "cpu_throttle_increment",
939 "an integer in the range of 1 to 99");
943 if (params
->has_max_bandwidth
&& (params
->max_bandwidth
> SIZE_MAX
)) {
944 error_setg(errp
, "Parameter 'max_bandwidth' expects an integer in the"
945 " range of 0 to %zu bytes/second", SIZE_MAX
);
949 if (params
->has_downtime_limit
&&
950 (params
->downtime_limit
> MAX_MIGRATE_DOWNTIME
)) {
951 error_setg(errp
, "Parameter 'downtime_limit' expects an integer in "
952 "the range of 0 to %d milliseconds",
953 MAX_MIGRATE_DOWNTIME
);
957 /* x_checkpoint_delay is now always positive */
959 if (params
->has_x_multifd_channels
&& (params
->x_multifd_channels
< 1)) {
960 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
962 "is invalid, it should be in the range of 1 to 255");
965 if (params
->has_x_multifd_page_count
&&
966 (params
->x_multifd_page_count
< 1 ||
967 params
->x_multifd_page_count
> 10000)) {
968 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
969 "multifd_page_count",
970 "is invalid, it should be in the range of 1 to 10000");
974 if (params
->has_xbzrle_cache_size
&&
975 (params
->xbzrle_cache_size
< qemu_target_page_size() ||
976 !is_power_of_2(params
->xbzrle_cache_size
))) {
977 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
979 "is invalid, it should be bigger than target page size"
980 " and a power of two");
987 static void migrate_params_test_apply(MigrateSetParameters
*params
,
988 MigrationParameters
*dest
)
990 *dest
= migrate_get_current()->parameters
;
992 /* TODO use QAPI_CLONE() instead of duplicating it inline */
994 if (params
->has_compress_level
) {
995 dest
->compress_level
= params
->compress_level
;
998 if (params
->has_compress_threads
) {
999 dest
->compress_threads
= params
->compress_threads
;
1002 if (params
->has_decompress_threads
) {
1003 dest
->decompress_threads
= params
->decompress_threads
;
1006 if (params
->has_cpu_throttle_initial
) {
1007 dest
->cpu_throttle_initial
= params
->cpu_throttle_initial
;
1010 if (params
->has_cpu_throttle_increment
) {
1011 dest
->cpu_throttle_increment
= params
->cpu_throttle_increment
;
1014 if (params
->has_tls_creds
) {
1015 assert(params
->tls_creds
->type
== QTYPE_QSTRING
);
1016 dest
->tls_creds
= g_strdup(params
->tls_creds
->u
.s
);
1019 if (params
->has_tls_hostname
) {
1020 assert(params
->tls_hostname
->type
== QTYPE_QSTRING
);
1021 dest
->tls_hostname
= g_strdup(params
->tls_hostname
->u
.s
);
1024 if (params
->has_max_bandwidth
) {
1025 dest
->max_bandwidth
= params
->max_bandwidth
;
1028 if (params
->has_downtime_limit
) {
1029 dest
->downtime_limit
= params
->downtime_limit
;
1032 if (params
->has_x_checkpoint_delay
) {
1033 dest
->x_checkpoint_delay
= params
->x_checkpoint_delay
;
1036 if (params
->has_block_incremental
) {
1037 dest
->block_incremental
= params
->block_incremental
;
1039 if (params
->has_x_multifd_channels
) {
1040 dest
->x_multifd_channels
= params
->x_multifd_channels
;
1042 if (params
->has_x_multifd_page_count
) {
1043 dest
->x_multifd_page_count
= params
->x_multifd_page_count
;
1045 if (params
->has_xbzrle_cache_size
) {
1046 dest
->xbzrle_cache_size
= params
->xbzrle_cache_size
;
1050 static void migrate_params_apply(MigrateSetParameters
*params
, Error
**errp
)
1052 MigrationState
*s
= migrate_get_current();
1054 /* TODO use QAPI_CLONE() instead of duplicating it inline */
1056 if (params
->has_compress_level
) {
1057 s
->parameters
.compress_level
= params
->compress_level
;
1060 if (params
->has_compress_threads
) {
1061 s
->parameters
.compress_threads
= params
->compress_threads
;
1064 if (params
->has_decompress_threads
) {
1065 s
->parameters
.decompress_threads
= params
->decompress_threads
;
1068 if (params
->has_cpu_throttle_initial
) {
1069 s
->parameters
.cpu_throttle_initial
= params
->cpu_throttle_initial
;
1072 if (params
->has_cpu_throttle_increment
) {
1073 s
->parameters
.cpu_throttle_increment
= params
->cpu_throttle_increment
;
1076 if (params
->has_tls_creds
) {
1077 g_free(s
->parameters
.tls_creds
);
1078 assert(params
->tls_creds
->type
== QTYPE_QSTRING
);
1079 s
->parameters
.tls_creds
= g_strdup(params
->tls_creds
->u
.s
);
1082 if (params
->has_tls_hostname
) {
1083 g_free(s
->parameters
.tls_hostname
);
1084 assert(params
->tls_hostname
->type
== QTYPE_QSTRING
);
1085 s
->parameters
.tls_hostname
= g_strdup(params
->tls_hostname
->u
.s
);
1088 if (params
->has_max_bandwidth
) {
1089 s
->parameters
.max_bandwidth
= params
->max_bandwidth
;
1090 if (s
->to_dst_file
) {
1091 qemu_file_set_rate_limit(s
->to_dst_file
,
1092 s
->parameters
.max_bandwidth
/ XFER_LIMIT_RATIO
);
1096 if (params
->has_downtime_limit
) {
1097 s
->parameters
.downtime_limit
= params
->downtime_limit
;
1100 if (params
->has_x_checkpoint_delay
) {
1101 s
->parameters
.x_checkpoint_delay
= params
->x_checkpoint_delay
;
1102 if (migration_in_colo_state()) {
1103 colo_checkpoint_notify(s
);
1107 if (params
->has_block_incremental
) {
1108 s
->parameters
.block_incremental
= params
->block_incremental
;
1110 if (params
->has_x_multifd_channels
) {
1111 s
->parameters
.x_multifd_channels
= params
->x_multifd_channels
;
1113 if (params
->has_x_multifd_page_count
) {
1114 s
->parameters
.x_multifd_page_count
= params
->x_multifd_page_count
;
1116 if (params
->has_xbzrle_cache_size
) {
1117 s
->parameters
.xbzrle_cache_size
= params
->xbzrle_cache_size
;
1118 xbzrle_cache_resize(params
->xbzrle_cache_size
, errp
);
1122 void qmp_migrate_set_parameters(MigrateSetParameters
*params
, Error
**errp
)
1124 MigrationParameters tmp
;
1126 /* TODO Rewrite "" to null instead */
1127 if (params
->has_tls_creds
1128 && params
->tls_creds
->type
== QTYPE_QNULL
) {
1129 qobject_unref(params
->tls_creds
->u
.n
);
1130 params
->tls_creds
->type
= QTYPE_QSTRING
;
1131 params
->tls_creds
->u
.s
= strdup("");
1133 /* TODO Rewrite "" to null instead */
1134 if (params
->has_tls_hostname
1135 && params
->tls_hostname
->type
== QTYPE_QNULL
) {
1136 qobject_unref(params
->tls_hostname
->u
.n
);
1137 params
->tls_hostname
->type
= QTYPE_QSTRING
;
1138 params
->tls_hostname
->u
.s
= strdup("");
1141 migrate_params_test_apply(params
, &tmp
);
1143 if (!migrate_params_check(&tmp
, errp
)) {
1144 /* Invalid parameter */
1148 migrate_params_apply(params
, errp
);
1152 void qmp_migrate_start_postcopy(Error
**errp
)
1154 MigrationState
*s
= migrate_get_current();
1156 if (!migrate_postcopy()) {
1157 error_setg(errp
, "Enable postcopy with migrate_set_capability before"
1158 " the start of migration");
1162 if (s
->state
== MIGRATION_STATUS_NONE
) {
1163 error_setg(errp
, "Postcopy must be started after migration has been"
1168 * we don't error if migration has finished since that would be racy
1169 * with issuing this command.
1171 atomic_set(&s
->start_postcopy
, true);
1174 /* shared migration helpers */
1176 void migrate_set_state(int *state
, int old_state
, int new_state
)
1178 assert(new_state
< MIGRATION_STATUS__MAX
);
1179 if (atomic_cmpxchg(state
, old_state
, new_state
) == old_state
) {
1180 trace_migrate_set_state(MigrationStatus_str(new_state
));
1181 migrate_generate_event(new_state
);
1185 static MigrationCapabilityStatusList
*migrate_cap_add(
1186 MigrationCapabilityStatusList
*list
,
1187 MigrationCapability index
,
1190 MigrationCapabilityStatusList
*cap
;
1192 cap
= g_new0(MigrationCapabilityStatusList
, 1);
1193 cap
->value
= g_new0(MigrationCapabilityStatus
, 1);
1194 cap
->value
->capability
= index
;
1195 cap
->value
->state
= state
;
1201 void migrate_set_block_enabled(bool value
, Error
**errp
)
1203 MigrationCapabilityStatusList
*cap
;
1205 cap
= migrate_cap_add(NULL
, MIGRATION_CAPABILITY_BLOCK
, value
);
1206 qmp_migrate_set_capabilities(cap
, errp
);
1207 qapi_free_MigrationCapabilityStatusList(cap
);
1210 static void migrate_set_block_incremental(MigrationState
*s
, bool value
)
1212 s
->parameters
.block_incremental
= value
;
1215 static void block_cleanup_parameters(MigrationState
*s
)
1217 if (s
->must_remove_block_options
) {
1218 /* setting to false can never fail */
1219 migrate_set_block_enabled(false, &error_abort
);
1220 migrate_set_block_incremental(s
, false);
1221 s
->must_remove_block_options
= false;
1225 static void migrate_fd_cleanup(void *opaque
)
1227 MigrationState
*s
= opaque
;
1229 qemu_bh_delete(s
->cleanup_bh
);
1230 s
->cleanup_bh
= NULL
;
1232 qemu_savevm_state_cleanup();
1234 if (s
->to_dst_file
) {
1235 Error
*local_err
= NULL
;
1237 trace_migrate_fd_cleanup();
1238 qemu_mutex_unlock_iothread();
1239 if (s
->migration_thread_running
) {
1240 qemu_thread_join(&s
->thread
);
1241 s
->migration_thread_running
= false;
1243 qemu_mutex_lock_iothread();
1245 if (multifd_save_cleanup(&local_err
) != 0) {
1246 error_report_err(local_err
);
1248 qemu_fclose(s
->to_dst_file
);
1249 s
->to_dst_file
= NULL
;
1252 assert((s
->state
!= MIGRATION_STATUS_ACTIVE
) &&
1253 (s
->state
!= MIGRATION_STATUS_POSTCOPY_ACTIVE
));
1255 if (s
->state
== MIGRATION_STATUS_CANCELLING
) {
1256 migrate_set_state(&s
->state
, MIGRATION_STATUS_CANCELLING
,
1257 MIGRATION_STATUS_CANCELLED
);
1261 /* It is used on info migrate. We can't free it */
1262 error_report_err(error_copy(s
->error
));
1264 notifier_list_notify(&migration_state_notifiers
, s
);
1265 block_cleanup_parameters(s
);
1268 void migrate_set_error(MigrationState
*s
, const Error
*error
)
1270 qemu_mutex_lock(&s
->error_mutex
);
1272 s
->error
= error_copy(error
);
1274 qemu_mutex_unlock(&s
->error_mutex
);
1277 void migrate_fd_error(MigrationState
*s
, const Error
*error
)
1279 trace_migrate_fd_error(error_get_pretty(error
));
1280 assert(s
->to_dst_file
== NULL
);
1281 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
1282 MIGRATION_STATUS_FAILED
);
1283 migrate_set_error(s
, error
);
1286 static void migrate_fd_cancel(MigrationState
*s
)
1289 QEMUFile
*f
= migrate_get_current()->to_dst_file
;
1290 trace_migrate_fd_cancel();
1292 if (s
->rp_state
.from_dst_file
) {
1293 /* shutdown the rp socket, so causing the rp thread to shutdown */
1294 qemu_file_shutdown(s
->rp_state
.from_dst_file
);
1298 old_state
= s
->state
;
1299 if (!migration_is_setup_or_active(old_state
)) {
1302 /* If the migration is paused, kick it out of the pause */
1303 if (old_state
== MIGRATION_STATUS_PRE_SWITCHOVER
) {
1304 qemu_sem_post(&s
->pause_sem
);
1306 migrate_set_state(&s
->state
, old_state
, MIGRATION_STATUS_CANCELLING
);
1307 } while (s
->state
!= MIGRATION_STATUS_CANCELLING
);
1310 * If we're unlucky the migration code might be stuck somewhere in a
1311 * send/write while the network has failed and is waiting to timeout;
1312 * if we've got shutdown(2) available then we can force it to quit.
1313 * The outgoing qemu file gets closed in migrate_fd_cleanup that is
1314 * called in a bh, so there is no race against this cancel.
1316 if (s
->state
== MIGRATION_STATUS_CANCELLING
&& f
) {
1317 qemu_file_shutdown(f
);
1319 if (s
->state
== MIGRATION_STATUS_CANCELLING
&& s
->block_inactive
) {
1320 Error
*local_err
= NULL
;
1322 bdrv_invalidate_cache_all(&local_err
);
1324 error_report_err(local_err
);
1326 s
->block_inactive
= false;
1331 void add_migration_state_change_notifier(Notifier
*notify
)
1333 notifier_list_add(&migration_state_notifiers
, notify
);
1336 void remove_migration_state_change_notifier(Notifier
*notify
)
1338 notifier_remove(notify
);
1341 bool migration_in_setup(MigrationState
*s
)
1343 return s
->state
== MIGRATION_STATUS_SETUP
;
1346 bool migration_has_finished(MigrationState
*s
)
1348 return s
->state
== MIGRATION_STATUS_COMPLETED
;
1351 bool migration_has_failed(MigrationState
*s
)
1353 return (s
->state
== MIGRATION_STATUS_CANCELLED
||
1354 s
->state
== MIGRATION_STATUS_FAILED
);
1357 bool migration_in_postcopy(void)
1359 MigrationState
*s
= migrate_get_current();
1361 return (s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
);
1364 bool migration_in_postcopy_after_devices(MigrationState
*s
)
1366 return migration_in_postcopy() && s
->postcopy_after_devices
;
1369 bool migration_is_idle(void)
1371 MigrationState
*s
= migrate_get_current();
1374 case MIGRATION_STATUS_NONE
:
1375 case MIGRATION_STATUS_CANCELLED
:
1376 case MIGRATION_STATUS_COMPLETED
:
1377 case MIGRATION_STATUS_FAILED
:
1379 case MIGRATION_STATUS_SETUP
:
1380 case MIGRATION_STATUS_CANCELLING
:
1381 case MIGRATION_STATUS_ACTIVE
:
1382 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
1383 case MIGRATION_STATUS_COLO
:
1384 case MIGRATION_STATUS_PRE_SWITCHOVER
:
1385 case MIGRATION_STATUS_DEVICE
:
1387 case MIGRATION_STATUS__MAX
:
1388 g_assert_not_reached();
1394 void migrate_init(MigrationState
*s
)
1397 * Reinitialise all migration state, except
1398 * parameters/capabilities that the user set, and
1404 s
->to_dst_file
= NULL
;
1405 s
->state
= MIGRATION_STATUS_NONE
;
1406 s
->rp_state
.from_dst_file
= NULL
;
1407 s
->rp_state
.error
= false;
1410 s
->expected_downtime
= 0;
1412 s
->start_postcopy
= false;
1413 s
->postcopy_after_devices
= false;
1414 s
->migration_thread_running
= false;
1415 error_free(s
->error
);
1418 migrate_set_state(&s
->state
, MIGRATION_STATUS_NONE
, MIGRATION_STATUS_SETUP
);
1420 s
->start_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
1422 s
->vm_was_running
= false;
1423 s
->iteration_initial_bytes
= 0;
1424 s
->threshold_size
= 0;
1427 static GSList
*migration_blockers
;
1429 int migrate_add_blocker(Error
*reason
, Error
**errp
)
1431 if (migrate_get_current()->only_migratable
) {
1432 error_propagate(errp
, error_copy(reason
));
1433 error_prepend(errp
, "disallowing migration blocker "
1434 "(--only_migratable) for: ");
1438 if (migration_is_idle()) {
1439 migration_blockers
= g_slist_prepend(migration_blockers
, reason
);
1443 error_propagate(errp
, error_copy(reason
));
1444 error_prepend(errp
, "disallowing migration blocker (migration in "
1449 void migrate_del_blocker(Error
*reason
)
1451 migration_blockers
= g_slist_remove(migration_blockers
, reason
);
1454 void qmp_migrate_incoming(const char *uri
, Error
**errp
)
1456 Error
*local_err
= NULL
;
1457 static bool once
= true;
1459 if (!deferred_incoming
) {
1460 error_setg(errp
, "For use with '-incoming defer'");
1464 error_setg(errp
, "The incoming migration has already been started");
1467 qemu_start_incoming_migration(uri
, &local_err
);
1470 error_propagate(errp
, local_err
);
1477 bool migration_is_blocked(Error
**errp
)
1479 if (qemu_savevm_state_blocked(errp
)) {
1483 if (migration_blockers
) {
1484 error_propagate(errp
, error_copy(migration_blockers
->data
));
1491 /* Returns true if continue to migrate, or false if error detected */
1492 static bool migrate_prepare(MigrationState
*s
, bool blk
, bool blk_inc
,
1493 bool resume
, Error
**errp
)
1495 Error
*local_err
= NULL
;
1498 if (s
->state
!= MIGRATION_STATUS_POSTCOPY_PAUSED
) {
1499 error_setg(errp
, "Cannot resume if there is no "
1500 "paused migration");
1503 /* This is a resume, skip init status */
1507 if (migration_is_setup_or_active(s
->state
) ||
1508 s
->state
== MIGRATION_STATUS_CANCELLING
||
1509 s
->state
== MIGRATION_STATUS_COLO
) {
1510 error_setg(errp
, QERR_MIGRATION_ACTIVE
);
1514 if (runstate_check(RUN_STATE_INMIGRATE
)) {
1515 error_setg(errp
, "Guest is waiting for an incoming migration");
1519 if (migration_is_blocked(errp
)) {
1523 if (blk
|| blk_inc
) {
1524 if (migrate_use_block() || migrate_use_block_incremental()) {
1525 error_setg(errp
, "Command options are incompatible with "
1526 "current migration capabilities");
1529 migrate_set_block_enabled(true, &local_err
);
1531 error_propagate(errp
, local_err
);
1534 s
->must_remove_block_options
= true;
1538 migrate_set_block_incremental(s
, true);
1546 void qmp_migrate(const char *uri
, bool has_blk
, bool blk
,
1547 bool has_inc
, bool inc
, bool has_detach
, bool detach
,
1548 bool has_resume
, bool resume
, Error
**errp
)
1550 Error
*local_err
= NULL
;
1551 MigrationState
*s
= migrate_get_current();
1554 if (!migrate_prepare(s
, has_blk
&& blk
, has_inc
&& inc
,
1555 has_resume
&& resume
, errp
)) {
1556 /* Error detected, put into errp */
1560 if (strstart(uri
, "tcp:", &p
)) {
1561 tcp_start_outgoing_migration(s
, p
, &local_err
);
1563 } else if (strstart(uri
, "rdma:", &p
)) {
1564 rdma_start_outgoing_migration(s
, p
, &local_err
);
1566 } else if (strstart(uri
, "exec:", &p
)) {
1567 exec_start_outgoing_migration(s
, p
, &local_err
);
1568 } else if (strstart(uri
, "unix:", &p
)) {
1569 unix_start_outgoing_migration(s
, p
, &local_err
);
1570 } else if (strstart(uri
, "fd:", &p
)) {
1571 fd_start_outgoing_migration(s
, p
, &local_err
);
1573 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "uri",
1574 "a valid migration protocol");
1575 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
1576 MIGRATION_STATUS_FAILED
);
1577 block_cleanup_parameters(s
);
1582 migrate_fd_error(s
, local_err
);
1583 error_propagate(errp
, local_err
);
1588 void qmp_migrate_cancel(Error
**errp
)
1590 migrate_fd_cancel(migrate_get_current());
1593 void qmp_migrate_continue(MigrationStatus state
, Error
**errp
)
1595 MigrationState
*s
= migrate_get_current();
1596 if (s
->state
!= state
) {
1597 error_setg(errp
, "Migration not in expected state: %s",
1598 MigrationStatus_str(s
->state
));
1601 qemu_sem_post(&s
->pause_sem
);
1604 void qmp_migrate_set_cache_size(int64_t value
, Error
**errp
)
1606 MigrateSetParameters p
= {
1607 .has_xbzrle_cache_size
= true,
1608 .xbzrle_cache_size
= value
,
1611 qmp_migrate_set_parameters(&p
, errp
);
1614 int64_t qmp_query_migrate_cache_size(Error
**errp
)
1616 return migrate_xbzrle_cache_size();
1619 void qmp_migrate_set_speed(int64_t value
, Error
**errp
)
1621 MigrateSetParameters p
= {
1622 .has_max_bandwidth
= true,
1623 .max_bandwidth
= value
,
1626 qmp_migrate_set_parameters(&p
, errp
);
1629 void qmp_migrate_set_downtime(double value
, Error
**errp
)
1631 if (value
< 0 || value
> MAX_MIGRATE_DOWNTIME_SECONDS
) {
1632 error_setg(errp
, "Parameter 'downtime_limit' expects an integer in "
1633 "the range of 0 to %d seconds",
1634 MAX_MIGRATE_DOWNTIME_SECONDS
);
1638 value
*= 1000; /* Convert to milliseconds */
1639 value
= MAX(0, MIN(INT64_MAX
, value
));
1641 MigrateSetParameters p
= {
1642 .has_downtime_limit
= true,
1643 .downtime_limit
= value
,
1646 qmp_migrate_set_parameters(&p
, errp
);
1649 bool migrate_release_ram(void)
1653 s
= migrate_get_current();
1655 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_RELEASE_RAM
];
1658 bool migrate_postcopy_ram(void)
1662 s
= migrate_get_current();
1664 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_POSTCOPY_RAM
];
1667 bool migrate_postcopy(void)
1669 return migrate_postcopy_ram() || migrate_dirty_bitmaps();
1672 bool migrate_auto_converge(void)
1676 s
= migrate_get_current();
1678 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_AUTO_CONVERGE
];
1681 bool migrate_zero_blocks(void)
1685 s
= migrate_get_current();
1687 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_ZERO_BLOCKS
];
1690 bool migrate_postcopy_blocktime(void)
1694 s
= migrate_get_current();
1696 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME
];
1699 bool migrate_use_compression(void)
1703 s
= migrate_get_current();
1705 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_COMPRESS
];
1708 int migrate_compress_level(void)
1712 s
= migrate_get_current();
1714 return s
->parameters
.compress_level
;
1717 int migrate_compress_threads(void)
1721 s
= migrate_get_current();
1723 return s
->parameters
.compress_threads
;
1726 int migrate_decompress_threads(void)
1730 s
= migrate_get_current();
1732 return s
->parameters
.decompress_threads
;
1735 bool migrate_dirty_bitmaps(void)
1739 s
= migrate_get_current();
1741 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_DIRTY_BITMAPS
];
1744 bool migrate_use_events(void)
1748 s
= migrate_get_current();
1750 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_EVENTS
];
1753 bool migrate_use_multifd(void)
1757 s
= migrate_get_current();
1759 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_X_MULTIFD
];
1762 bool migrate_pause_before_switchover(void)
1766 s
= migrate_get_current();
1768 return s
->enabled_capabilities
[
1769 MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER
];
1772 int migrate_multifd_channels(void)
1776 s
= migrate_get_current();
1778 return s
->parameters
.x_multifd_channels
;
1781 int migrate_multifd_page_count(void)
1785 s
= migrate_get_current();
1787 return s
->parameters
.x_multifd_page_count
;
1790 int migrate_use_xbzrle(void)
1794 s
= migrate_get_current();
1796 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_XBZRLE
];
1799 int64_t migrate_xbzrle_cache_size(void)
1803 s
= migrate_get_current();
1805 return s
->parameters
.xbzrle_cache_size
;
1808 bool migrate_use_block(void)
1812 s
= migrate_get_current();
1814 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_BLOCK
];
1817 bool migrate_use_return_path(void)
1821 s
= migrate_get_current();
1823 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_RETURN_PATH
];
1826 bool migrate_use_block_incremental(void)
1830 s
= migrate_get_current();
1832 return s
->parameters
.block_incremental
;
1835 /* migration thread support */
1837 * Something bad happened to the RP stream, mark an error
1838 * The caller shall print or trace something to indicate why
1840 static void mark_source_rp_bad(MigrationState
*s
)
1842 s
->rp_state
.error
= true;
1845 static struct rp_cmd_args
{
1846 ssize_t len
; /* -1 = variable */
1849 [MIG_RP_MSG_INVALID
] = { .len
= -1, .name
= "INVALID" },
1850 [MIG_RP_MSG_SHUT
] = { .len
= 4, .name
= "SHUT" },
1851 [MIG_RP_MSG_PONG
] = { .len
= 4, .name
= "PONG" },
1852 [MIG_RP_MSG_REQ_PAGES
] = { .len
= 12, .name
= "REQ_PAGES" },
1853 [MIG_RP_MSG_REQ_PAGES_ID
] = { .len
= -1, .name
= "REQ_PAGES_ID" },
1854 [MIG_RP_MSG_RECV_BITMAP
] = { .len
= -1, .name
= "RECV_BITMAP" },
1855 [MIG_RP_MSG_RESUME_ACK
] = { .len
= 4, .name
= "RESUME_ACK" },
1856 [MIG_RP_MSG_MAX
] = { .len
= -1, .name
= "MAX" },
1860 * Process a request for pages received on the return path,
1861 * We're allowed to send more than requested (e.g. to round to our page size)
1862 * and we don't need to send pages that have already been sent.
1864 static void migrate_handle_rp_req_pages(MigrationState
*ms
, const char* rbname
,
1865 ram_addr_t start
, size_t len
)
1867 long our_host_ps
= getpagesize();
1869 trace_migrate_handle_rp_req_pages(rbname
, start
, len
);
1872 * Since we currently insist on matching page sizes, just sanity check
1873 * we're being asked for whole host pages.
1875 if (start
& (our_host_ps
-1) ||
1876 (len
& (our_host_ps
-1))) {
1877 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
1878 " len: %zd", __func__
, start
, len
);
1879 mark_source_rp_bad(ms
);
1883 if (ram_save_queue_pages(rbname
, start
, len
)) {
1884 mark_source_rp_bad(ms
);
1888 /* Return true to retry, false to quit */
1889 static bool postcopy_pause_return_path_thread(MigrationState
*s
)
1891 trace_postcopy_pause_return_path();
1893 qemu_sem_wait(&s
->postcopy_pause_rp_sem
);
1895 trace_postcopy_pause_return_path_continued();
1900 static int migrate_handle_rp_recv_bitmap(MigrationState
*s
, char *block_name
)
1902 RAMBlock
*block
= qemu_ram_block_by_name(block_name
);
1905 error_report("%s: invalid block name '%s'", __func__
, block_name
);
1909 /* Fetch the received bitmap and refresh the dirty bitmap */
1910 return ram_dirty_bitmap_reload(s
, block
);
1913 static int migrate_handle_rp_resume_ack(MigrationState
*s
, uint32_t value
)
1915 trace_source_return_path_thread_resume_ack(value
);
1917 if (value
!= MIGRATION_RESUME_ACK_VALUE
) {
1918 error_report("%s: illegal resume_ack value %"PRIu32
,
1923 /* Now both sides are active. */
1924 migrate_set_state(&s
->state
, MIGRATION_STATUS_POSTCOPY_RECOVER
,
1925 MIGRATION_STATUS_POSTCOPY_ACTIVE
);
1927 /* TODO: notify send thread that time to continue send pages */
1933 * Handles messages sent on the return path towards the source VM
1936 static void *source_return_path_thread(void *opaque
)
1938 MigrationState
*ms
= opaque
;
1939 QEMUFile
*rp
= ms
->rp_state
.from_dst_file
;
1940 uint16_t header_len
, header_type
;
1942 uint32_t tmp32
, sibling_error
;
1943 ram_addr_t start
= 0; /* =0 to silence warning */
1944 size_t len
= 0, expected_len
;
1947 trace_source_return_path_thread_entry();
1950 while (!ms
->rp_state
.error
&& !qemu_file_get_error(rp
) &&
1951 migration_is_setup_or_active(ms
->state
)) {
1952 trace_source_return_path_thread_loop_top();
1953 header_type
= qemu_get_be16(rp
);
1954 header_len
= qemu_get_be16(rp
);
1956 if (qemu_file_get_error(rp
)) {
1957 mark_source_rp_bad(ms
);
1961 if (header_type
>= MIG_RP_MSG_MAX
||
1962 header_type
== MIG_RP_MSG_INVALID
) {
1963 error_report("RP: Received invalid message 0x%04x length 0x%04x",
1964 header_type
, header_len
);
1965 mark_source_rp_bad(ms
);
1969 if ((rp_cmd_args
[header_type
].len
!= -1 &&
1970 header_len
!= rp_cmd_args
[header_type
].len
) ||
1971 header_len
> sizeof(buf
)) {
1972 error_report("RP: Received '%s' message (0x%04x) with"
1973 "incorrect length %d expecting %zu",
1974 rp_cmd_args
[header_type
].name
, header_type
, header_len
,
1975 (size_t)rp_cmd_args
[header_type
].len
);
1976 mark_source_rp_bad(ms
);
1980 /* We know we've got a valid header by this point */
1981 res
= qemu_get_buffer(rp
, buf
, header_len
);
1982 if (res
!= header_len
) {
1983 error_report("RP: Failed reading data for message 0x%04x"
1984 " read %d expected %d",
1985 header_type
, res
, header_len
);
1986 mark_source_rp_bad(ms
);
1990 /* OK, we have the message and the data */
1991 switch (header_type
) {
1992 case MIG_RP_MSG_SHUT
:
1993 sibling_error
= ldl_be_p(buf
);
1994 trace_source_return_path_thread_shut(sibling_error
);
1995 if (sibling_error
) {
1996 error_report("RP: Sibling indicated error %d", sibling_error
);
1997 mark_source_rp_bad(ms
);
2000 * We'll let the main thread deal with closing the RP
2001 * we could do a shutdown(2) on it, but we're the only user
2002 * anyway, so there's nothing gained.
2006 case MIG_RP_MSG_PONG
:
2007 tmp32
= ldl_be_p(buf
);
2008 trace_source_return_path_thread_pong(tmp32
);
2011 case MIG_RP_MSG_REQ_PAGES
:
2012 start
= ldq_be_p(buf
);
2013 len
= ldl_be_p(buf
+ 8);
2014 migrate_handle_rp_req_pages(ms
, NULL
, start
, len
);
2017 case MIG_RP_MSG_REQ_PAGES_ID
:
2018 expected_len
= 12 + 1; /* header + termination */
2020 if (header_len
>= expected_len
) {
2021 start
= ldq_be_p(buf
);
2022 len
= ldl_be_p(buf
+ 8);
2023 /* Now we expect an idstr */
2024 tmp32
= buf
[12]; /* Length of the following idstr */
2025 buf
[13 + tmp32
] = '\0';
2026 expected_len
+= tmp32
;
2028 if (header_len
!= expected_len
) {
2029 error_report("RP: Req_Page_id with length %d expecting %zd",
2030 header_len
, expected_len
);
2031 mark_source_rp_bad(ms
);
2034 migrate_handle_rp_req_pages(ms
, (char *)&buf
[13], start
, len
);
2037 case MIG_RP_MSG_RECV_BITMAP
:
2038 if (header_len
< 1) {
2039 error_report("%s: missing block name", __func__
);
2040 mark_source_rp_bad(ms
);
2043 /* Format: len (1B) + idstr (<255B). This ends the idstr. */
2044 buf
[buf
[0] + 1] = '\0';
2045 if (migrate_handle_rp_recv_bitmap(ms
, (char *)(buf
+ 1))) {
2046 mark_source_rp_bad(ms
);
2051 case MIG_RP_MSG_RESUME_ACK
:
2052 tmp32
= ldl_be_p(buf
);
2053 if (migrate_handle_rp_resume_ack(ms
, tmp32
)) {
2054 mark_source_rp_bad(ms
);
2065 res
= qemu_file_get_error(rp
);
2069 * Maybe there is something we can do: it looks like a
2070 * network down issue, and we pause for a recovery.
2072 if (postcopy_pause_return_path_thread(ms
)) {
2073 /* Reload rp, reset the rest */
2074 rp
= ms
->rp_state
.from_dst_file
;
2075 ms
->rp_state
.error
= false;
2080 trace_source_return_path_thread_bad_end();
2081 mark_source_rp_bad(ms
);
2084 trace_source_return_path_thread_end();
2085 ms
->rp_state
.from_dst_file
= NULL
;
2090 static int open_return_path_on_source(MigrationState
*ms
,
2094 ms
->rp_state
.from_dst_file
= qemu_file_get_return_path(ms
->to_dst_file
);
2095 if (!ms
->rp_state
.from_dst_file
) {
2099 trace_open_return_path_on_source();
2101 if (!create_thread
) {
2106 qemu_thread_create(&ms
->rp_state
.rp_thread
, "return path",
2107 source_return_path_thread
, ms
, QEMU_THREAD_JOINABLE
);
2109 trace_open_return_path_on_source_continue();
2114 /* Returns 0 if the RP was ok, otherwise there was an error on the RP */
2115 static int await_return_path_close_on_source(MigrationState
*ms
)
2118 * If this is a normal exit then the destination will send a SHUT and the
2119 * rp_thread will exit, however if there's an error we need to cause
2122 if (qemu_file_get_error(ms
->to_dst_file
) && ms
->rp_state
.from_dst_file
) {
2124 * shutdown(2), if we have it, will cause it to unblock if it's stuck
2125 * waiting for the destination.
2127 qemu_file_shutdown(ms
->rp_state
.from_dst_file
);
2128 mark_source_rp_bad(ms
);
2130 trace_await_return_path_close_on_source_joining();
2131 qemu_thread_join(&ms
->rp_state
.rp_thread
);
2132 trace_await_return_path_close_on_source_close();
2133 return ms
->rp_state
.error
;
2137 * Switch from normal iteration to postcopy
2138 * Returns non-0 on error
2140 static int postcopy_start(MigrationState
*ms
)
2143 QIOChannelBuffer
*bioc
;
2145 int64_t time_at_stop
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2146 bool restart_block
= false;
2147 int cur_state
= MIGRATION_STATUS_ACTIVE
;
2148 if (!migrate_pause_before_switchover()) {
2149 migrate_set_state(&ms
->state
, MIGRATION_STATUS_ACTIVE
,
2150 MIGRATION_STATUS_POSTCOPY_ACTIVE
);
2153 trace_postcopy_start();
2154 qemu_mutex_lock_iothread();
2155 trace_postcopy_start_set_run();
2157 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER
);
2158 global_state_store();
2159 ret
= vm_stop_force_state(RUN_STATE_FINISH_MIGRATE
);
2164 ret
= migration_maybe_pause(ms
, &cur_state
,
2165 MIGRATION_STATUS_POSTCOPY_ACTIVE
);
2170 ret
= bdrv_inactivate_all();
2174 restart_block
= true;
2177 * Cause any non-postcopiable, but iterative devices to
2178 * send out their final data.
2180 qemu_savevm_state_complete_precopy(ms
->to_dst_file
, true, false);
2183 * in Finish migrate and with the io-lock held everything should
2184 * be quiet, but we've potentially still got dirty pages and we
2185 * need to tell the destination to throw any pages it's already received
2188 if (migrate_postcopy_ram()) {
2189 if (ram_postcopy_send_discard_bitmap(ms
)) {
2190 error_report("postcopy send discard bitmap failed");
2196 * send rest of state - note things that are doing postcopy
2197 * will notice we're in POSTCOPY_ACTIVE and not actually
2198 * wrap their state up here
2200 qemu_file_set_rate_limit(ms
->to_dst_file
, INT64_MAX
);
2201 if (migrate_postcopy_ram()) {
2202 /* Ping just for debugging, helps line traces up */
2203 qemu_savevm_send_ping(ms
->to_dst_file
, 2);
2207 * While loading the device state we may trigger page transfer
2208 * requests and the fd must be free to process those, and thus
2209 * the destination must read the whole device state off the fd before
2210 * it starts processing it. Unfortunately the ad-hoc migration format
2211 * doesn't allow the destination to know the size to read without fully
2212 * parsing it through each devices load-state code (especially the open
2213 * coded devices that use get/put).
2214 * So we wrap the device state up in a package with a length at the start;
2215 * to do this we use a qemu_buf to hold the whole of the device state.
2217 bioc
= qio_channel_buffer_new(4096);
2218 qio_channel_set_name(QIO_CHANNEL(bioc
), "migration-postcopy-buffer");
2219 fb
= qemu_fopen_channel_output(QIO_CHANNEL(bioc
));
2220 object_unref(OBJECT(bioc
));
2223 * Make sure the receiver can get incoming pages before we send the rest
2226 qemu_savevm_send_postcopy_listen(fb
);
2228 qemu_savevm_state_complete_precopy(fb
, false, false);
2229 if (migrate_postcopy_ram()) {
2230 qemu_savevm_send_ping(fb
, 3);
2233 qemu_savevm_send_postcopy_run(fb
);
2235 /* <><> end of stuff going into the package */
2237 /* Last point of recovery; as soon as we send the package the destination
2238 * can open devices and potentially start running.
2239 * Lets just check again we've not got any errors.
2241 ret
= qemu_file_get_error(ms
->to_dst_file
);
2243 error_report("postcopy_start: Migration stream errored (pre package)");
2247 restart_block
= false;
2249 /* Now send that blob */
2250 if (qemu_savevm_send_packaged(ms
->to_dst_file
, bioc
->data
, bioc
->usage
)) {
2255 /* Send a notify to give a chance for anything that needs to happen
2256 * at the transition to postcopy and after the device state; in particular
2257 * spice needs to trigger a transition now
2259 ms
->postcopy_after_devices
= true;
2260 notifier_list_notify(&migration_state_notifiers
, ms
);
2262 ms
->downtime
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
) - time_at_stop
;
2264 qemu_mutex_unlock_iothread();
2266 if (migrate_postcopy_ram()) {
2268 * Although this ping is just for debug, it could potentially be
2269 * used for getting a better measurement of downtime at the source.
2271 qemu_savevm_send_ping(ms
->to_dst_file
, 4);
2274 if (migrate_release_ram()) {
2275 ram_postcopy_migrated_memory_release(ms
);
2278 ret
= qemu_file_get_error(ms
->to_dst_file
);
2280 error_report("postcopy_start: Migration stream errored");
2281 migrate_set_state(&ms
->state
, MIGRATION_STATUS_POSTCOPY_ACTIVE
,
2282 MIGRATION_STATUS_FAILED
);
2290 migrate_set_state(&ms
->state
, MIGRATION_STATUS_POSTCOPY_ACTIVE
,
2291 MIGRATION_STATUS_FAILED
);
2292 if (restart_block
) {
2293 /* A failure happened early enough that we know the destination hasn't
2294 * accessed block devices, so we're safe to recover.
2296 Error
*local_err
= NULL
;
2298 bdrv_invalidate_cache_all(&local_err
);
2300 error_report_err(local_err
);
2303 qemu_mutex_unlock_iothread();
2308 * migration_maybe_pause: Pause if required to by
2309 * migrate_pause_before_switchover called with the iothread locked
2310 * Returns: 0 on success
2312 static int migration_maybe_pause(MigrationState
*s
,
2313 int *current_active_state
,
2316 if (!migrate_pause_before_switchover()) {
2320 /* Since leaving this state is not atomic with posting the semaphore
2321 * it's possible that someone could have issued multiple migrate_continue
2322 * and the semaphore is incorrectly positive at this point;
2323 * the docs say it's undefined to reinit a semaphore that's already
2324 * init'd, so use timedwait to eat up any existing posts.
2326 while (qemu_sem_timedwait(&s
->pause_sem
, 1) == 0) {
2327 /* This block intentionally left blank */
2330 qemu_mutex_unlock_iothread();
2331 migrate_set_state(&s
->state
, *current_active_state
,
2332 MIGRATION_STATUS_PRE_SWITCHOVER
);
2333 qemu_sem_wait(&s
->pause_sem
);
2334 migrate_set_state(&s
->state
, MIGRATION_STATUS_PRE_SWITCHOVER
,
2336 *current_active_state
= new_state
;
2337 qemu_mutex_lock_iothread();
2339 return s
->state
== new_state
? 0 : -EINVAL
;
2343 * migration_completion: Used by migration_thread when there's not much left.
2344 * The caller 'breaks' the loop when this returns.
2346 * @s: Current migration state
2348 static void migration_completion(MigrationState
*s
)
2351 int current_active_state
= s
->state
;
2353 if (s
->state
== MIGRATION_STATUS_ACTIVE
) {
2354 qemu_mutex_lock_iothread();
2355 s
->downtime_start
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2356 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER
);
2357 s
->vm_was_running
= runstate_is_running();
2358 ret
= global_state_store();
2361 bool inactivate
= !migrate_colo_enabled();
2362 ret
= vm_stop_force_state(RUN_STATE_FINISH_MIGRATE
);
2364 ret
= migration_maybe_pause(s
, ¤t_active_state
,
2365 MIGRATION_STATUS_DEVICE
);
2368 qemu_file_set_rate_limit(s
->to_dst_file
, INT64_MAX
);
2369 ret
= qemu_savevm_state_complete_precopy(s
->to_dst_file
, false,
2372 if (inactivate
&& ret
>= 0) {
2373 s
->block_inactive
= true;
2376 qemu_mutex_unlock_iothread();
2381 } else if (s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
) {
2382 trace_migration_completion_postcopy_end();
2384 qemu_savevm_state_complete_postcopy(s
->to_dst_file
);
2385 trace_migration_completion_postcopy_end_after_complete();
2389 * If rp was opened we must clean up the thread before
2390 * cleaning everything else up (since if there are no failures
2391 * it will wait for the destination to send it's status in
2394 if (s
->rp_state
.from_dst_file
) {
2396 trace_migration_return_path_end_before();
2397 rp_error
= await_return_path_close_on_source(s
);
2398 trace_migration_return_path_end_after(rp_error
);
2400 goto fail_invalidate
;
2404 if (qemu_file_get_error(s
->to_dst_file
)) {
2405 trace_migration_completion_file_err();
2406 goto fail_invalidate
;
2409 if (!migrate_colo_enabled()) {
2410 migrate_set_state(&s
->state
, current_active_state
,
2411 MIGRATION_STATUS_COMPLETED
);
2417 /* If not doing postcopy, vm_start() will be called: let's regain
2418 * control on images.
2420 if (s
->state
== MIGRATION_STATUS_ACTIVE
||
2421 s
->state
== MIGRATION_STATUS_DEVICE
) {
2422 Error
*local_err
= NULL
;
2424 qemu_mutex_lock_iothread();
2425 bdrv_invalidate_cache_all(&local_err
);
2427 error_report_err(local_err
);
2429 s
->block_inactive
= false;
2431 qemu_mutex_unlock_iothread();
2435 migrate_set_state(&s
->state
, current_active_state
,
2436 MIGRATION_STATUS_FAILED
);
2439 bool migrate_colo_enabled(void)
2441 MigrationState
*s
= migrate_get_current();
2442 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_X_COLO
];
2445 typedef enum MigThrError
{
2446 /* No error detected */
2447 MIG_THR_ERR_NONE
= 0,
2448 /* Detected error, but resumed successfully */
2449 MIG_THR_ERR_RECOVERED
= 1,
2450 /* Detected fatal error, need to exit */
2451 MIG_THR_ERR_FATAL
= 2,
2454 /* Return zero if success, or <0 for error */
2455 static int postcopy_do_resume(MigrationState
*s
)
2457 /* TODO: do the resume logic */
2462 * We don't return until we are in a safe state to continue current
2463 * postcopy migration. Returns MIG_THR_ERR_RECOVERED if recovered, or
2464 * MIG_THR_ERR_FATAL if unrecovery failure happened.
2466 static MigThrError
postcopy_pause(MigrationState
*s
)
2468 assert(s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
);
2471 migrate_set_state(&s
->state
, s
->state
,
2472 MIGRATION_STATUS_POSTCOPY_PAUSED
);
2474 /* Current channel is possibly broken. Release it. */
2475 assert(s
->to_dst_file
);
2476 qemu_file_shutdown(s
->to_dst_file
);
2477 qemu_fclose(s
->to_dst_file
);
2478 s
->to_dst_file
= NULL
;
2480 error_report("Detected IO failure for postcopy. "
2481 "Migration paused.");
2484 * We wait until things fixed up. Then someone will setup the
2485 * status back for us.
2487 while (s
->state
== MIGRATION_STATUS_POSTCOPY_PAUSED
) {
2488 qemu_sem_wait(&s
->postcopy_pause_sem
);
2491 if (s
->state
== MIGRATION_STATUS_POSTCOPY_RECOVER
) {
2492 /* Woken up by a recover procedure. Give it a shot */
2495 * Firstly, let's wake up the return path now, with a new
2496 * return path channel.
2498 qemu_sem_post(&s
->postcopy_pause_rp_sem
);
2500 /* Do the resume logic */
2501 if (postcopy_do_resume(s
) == 0) {
2502 /* Let's continue! */
2503 trace_postcopy_pause_continued();
2504 return MIG_THR_ERR_RECOVERED
;
2507 * Something wrong happened during the recovery, let's
2508 * pause again. Pause is always better than throwing
2514 /* This is not right... Time to quit. */
2515 return MIG_THR_ERR_FATAL
;
2520 static MigThrError
migration_detect_error(MigrationState
*s
)
2524 /* Try to detect any file errors */
2525 ret
= qemu_file_get_error(s
->to_dst_file
);
2528 /* Everything is fine */
2529 return MIG_THR_ERR_NONE
;
2532 if (s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
&& ret
== -EIO
) {
2534 * For postcopy, we allow the network to be down for a
2535 * while. After that, it can be continued by a
2538 return postcopy_pause(s
);
2541 * For precopy (or postcopy with error outside IO), we fail
2544 migrate_set_state(&s
->state
, s
->state
, MIGRATION_STATUS_FAILED
);
2545 trace_migration_thread_file_err();
2547 /* Time to stop the migration, now. */
2548 return MIG_THR_ERR_FATAL
;
2552 static void migration_calculate_complete(MigrationState
*s
)
2554 uint64_t bytes
= qemu_ftell(s
->to_dst_file
);
2555 int64_t end_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2557 s
->total_time
= end_time
- s
->start_time
;
2560 * It's still not set, so we are precopy migration. For
2561 * postcopy, downtime is calculated during postcopy_start().
2563 s
->downtime
= end_time
- s
->downtime_start
;
2566 if (s
->total_time
) {
2567 s
->mbps
= ((double) bytes
* 8.0) / s
->total_time
/ 1000;
2571 static void migration_update_counters(MigrationState
*s
,
2572 int64_t current_time
)
2574 uint64_t transferred
, time_spent
;
2577 if (current_time
< s
->iteration_start_time
+ BUFFER_DELAY
) {
2581 transferred
= qemu_ftell(s
->to_dst_file
) - s
->iteration_initial_bytes
;
2582 time_spent
= current_time
- s
->iteration_start_time
;
2583 bandwidth
= (double)transferred
/ time_spent
;
2584 s
->threshold_size
= bandwidth
* s
->parameters
.downtime_limit
;
2586 s
->mbps
= (((double) transferred
* 8.0) /
2587 ((double) time_spent
/ 1000.0)) / 1000.0 / 1000.0;
2590 * if we haven't sent anything, we don't want to
2591 * recalculate. 10000 is a small enough number for our purposes
2593 if (ram_counters
.dirty_pages_rate
&& transferred
> 10000) {
2594 s
->expected_downtime
= ram_counters
.dirty_pages_rate
*
2595 qemu_target_page_size() / bandwidth
;
2598 qemu_file_reset_rate_limit(s
->to_dst_file
);
2600 s
->iteration_start_time
= current_time
;
2601 s
->iteration_initial_bytes
= qemu_ftell(s
->to_dst_file
);
2603 trace_migrate_transferred(transferred
, time_spent
,
2604 bandwidth
, s
->threshold_size
);
2607 /* Migration thread iteration status */
2609 MIG_ITERATE_RESUME
, /* Resume current iteration */
2610 MIG_ITERATE_SKIP
, /* Skip current iteration */
2611 MIG_ITERATE_BREAK
, /* Break the loop */
2615 * Return true if continue to the next iteration directly, false
2618 static MigIterateState
migration_iteration_run(MigrationState
*s
)
2620 uint64_t pending_size
, pend_pre
, pend_compat
, pend_post
;
2621 bool in_postcopy
= s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
;
2623 qemu_savevm_state_pending(s
->to_dst_file
, s
->threshold_size
, &pend_pre
,
2624 &pend_compat
, &pend_post
);
2625 pending_size
= pend_pre
+ pend_compat
+ pend_post
;
2627 trace_migrate_pending(pending_size
, s
->threshold_size
,
2628 pend_pre
, pend_compat
, pend_post
);
2630 if (pending_size
&& pending_size
>= s
->threshold_size
) {
2631 /* Still a significant amount to transfer */
2632 if (migrate_postcopy() && !in_postcopy
&&
2633 pend_pre
<= s
->threshold_size
&&
2634 atomic_read(&s
->start_postcopy
)) {
2635 if (postcopy_start(s
)) {
2636 error_report("%s: postcopy failed to start", __func__
);
2638 return MIG_ITERATE_SKIP
;
2640 /* Just another iteration step */
2641 qemu_savevm_state_iterate(s
->to_dst_file
,
2642 s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
);
2644 trace_migration_thread_low_pending(pending_size
);
2645 migration_completion(s
);
2646 return MIG_ITERATE_BREAK
;
2649 return MIG_ITERATE_RESUME
;
2652 static void migration_iteration_finish(MigrationState
*s
)
2654 /* If we enabled cpu throttling for auto-converge, turn it off. */
2655 cpu_throttle_stop();
2657 qemu_mutex_lock_iothread();
2659 case MIGRATION_STATUS_COMPLETED
:
2660 migration_calculate_complete(s
);
2661 runstate_set(RUN_STATE_POSTMIGRATE
);
2664 case MIGRATION_STATUS_ACTIVE
:
2666 * We should really assert here, but since it's during
2667 * migration, let's try to reduce the usage of assertions.
2669 if (!migrate_colo_enabled()) {
2670 error_report("%s: critical error: calling COLO code without "
2671 "COLO enabled", __func__
);
2673 migrate_start_colo_process(s
);
2675 * Fixme: we will run VM in COLO no matter its old running state.
2676 * After exited COLO, we will keep running.
2678 s
->vm_was_running
= true;
2680 case MIGRATION_STATUS_FAILED
:
2681 case MIGRATION_STATUS_CANCELLED
:
2682 if (s
->vm_was_running
) {
2685 if (runstate_check(RUN_STATE_FINISH_MIGRATE
)) {
2686 runstate_set(RUN_STATE_POSTMIGRATE
);
2692 /* Should not reach here, but if so, forgive the VM. */
2693 error_report("%s: Unknown ending state %d", __func__
, s
->state
);
2696 qemu_bh_schedule(s
->cleanup_bh
);
2697 qemu_mutex_unlock_iothread();
2701 * Master migration thread on the source VM.
2702 * It drives the migration and pumps the data down the outgoing channel.
2704 static void *migration_thread(void *opaque
)
2706 MigrationState
*s
= opaque
;
2707 int64_t setup_start
= qemu_clock_get_ms(QEMU_CLOCK_HOST
);
2708 MigThrError thr_error
;
2710 rcu_register_thread();
2712 s
->iteration_start_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2714 qemu_savevm_state_header(s
->to_dst_file
);
2717 * If we opened the return path, we need to make sure dst has it
2720 if (s
->rp_state
.from_dst_file
) {
2721 /* Now tell the dest that it should open its end so it can reply */
2722 qemu_savevm_send_open_return_path(s
->to_dst_file
);
2724 /* And do a ping that will make stuff easier to debug */
2725 qemu_savevm_send_ping(s
->to_dst_file
, 1);
2728 if (migrate_postcopy()) {
2730 * Tell the destination that we *might* want to do postcopy later;
2731 * if the other end can't do postcopy it should fail now, nice and
2734 qemu_savevm_send_postcopy_advise(s
->to_dst_file
);
2737 qemu_savevm_state_setup(s
->to_dst_file
);
2739 s
->setup_time
= qemu_clock_get_ms(QEMU_CLOCK_HOST
) - setup_start
;
2740 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
2741 MIGRATION_STATUS_ACTIVE
);
2743 trace_migration_thread_setup_complete();
2745 while (s
->state
== MIGRATION_STATUS_ACTIVE
||
2746 s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
) {
2747 int64_t current_time
;
2749 if (!qemu_file_rate_limit(s
->to_dst_file
)) {
2750 MigIterateState iter_state
= migration_iteration_run(s
);
2751 if (iter_state
== MIG_ITERATE_SKIP
) {
2753 } else if (iter_state
== MIG_ITERATE_BREAK
) {
2759 * Try to detect any kind of failures, and see whether we
2760 * should stop the migration now.
2762 thr_error
= migration_detect_error(s
);
2763 if (thr_error
== MIG_THR_ERR_FATAL
) {
2764 /* Stop migration */
2766 } else if (thr_error
== MIG_THR_ERR_RECOVERED
) {
2768 * Just recovered from a e.g. network failure, reset all
2769 * the local variables. This is important to avoid
2770 * breaking transferred_bytes and bandwidth calculation
2772 s
->iteration_start_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2773 s
->iteration_initial_bytes
= 0;
2776 current_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2778 migration_update_counters(s
, current_time
);
2780 if (qemu_file_rate_limit(s
->to_dst_file
)) {
2781 /* usleep expects microseconds */
2782 g_usleep((s
->iteration_start_time
+ BUFFER_DELAY
-
2783 current_time
) * 1000);
2787 trace_migration_thread_after_loop();
2788 migration_iteration_finish(s
);
2789 rcu_unregister_thread();
2793 void migrate_fd_connect(MigrationState
*s
, Error
*error_in
)
2796 bool resume
= s
->state
== MIGRATION_STATUS_POSTCOPY_PAUSED
;
2798 s
->expected_downtime
= s
->parameters
.downtime_limit
;
2799 s
->cleanup_bh
= qemu_bh_new(migrate_fd_cleanup
, s
);
2801 migrate_fd_error(s
, error_in
);
2802 migrate_fd_cleanup(s
);
2807 /* This is a resumed migration */
2808 rate_limit
= INT64_MAX
;
2810 /* This is a fresh new migration */
2811 rate_limit
= s
->parameters
.max_bandwidth
/ XFER_LIMIT_RATIO
;
2812 s
->expected_downtime
= s
->parameters
.downtime_limit
;
2813 s
->cleanup_bh
= qemu_bh_new(migrate_fd_cleanup
, s
);
2815 /* Notify before starting migration thread */
2816 notifier_list_notify(&migration_state_notifiers
, s
);
2819 qemu_file_set_rate_limit(s
->to_dst_file
, rate_limit
);
2820 qemu_file_set_blocking(s
->to_dst_file
, true);
2823 * Open the return path. For postcopy, it is used exclusively. For
2824 * precopy, only if user specified "return-path" capability would
2825 * QEMU uses the return path.
2827 if (migrate_postcopy_ram() || migrate_use_return_path()) {
2828 if (open_return_path_on_source(s
, !resume
)) {
2829 error_report("Unable to open return-path for postcopy");
2830 migrate_set_state(&s
->state
, s
->state
, MIGRATION_STATUS_FAILED
);
2831 migrate_fd_cleanup(s
);
2837 /* Wakeup the main migration thread to do the recovery */
2838 migrate_set_state(&s
->state
, MIGRATION_STATUS_POSTCOPY_PAUSED
,
2839 MIGRATION_STATUS_POSTCOPY_RECOVER
);
2840 qemu_sem_post(&s
->postcopy_pause_sem
);
2844 if (multifd_save_setup() != 0) {
2845 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
2846 MIGRATION_STATUS_FAILED
);
2847 migrate_fd_cleanup(s
);
2850 qemu_thread_create(&s
->thread
, "live_migration", migration_thread
, s
,
2851 QEMU_THREAD_JOINABLE
);
2852 s
->migration_thread_running
= true;
2855 void migration_global_dump(Monitor
*mon
)
2857 MigrationState
*ms
= migrate_get_current();
2859 monitor_printf(mon
, "globals:\n");
2860 monitor_printf(mon
, "store-global-state: %s\n",
2861 ms
->store_global_state
? "on" : "off");
2862 monitor_printf(mon
, "only-migratable: %s\n",
2863 ms
->only_migratable
? "on" : "off");
2864 monitor_printf(mon
, "send-configuration: %s\n",
2865 ms
->send_configuration
? "on" : "off");
2866 monitor_printf(mon
, "send-section-footer: %s\n",
2867 ms
->send_section_footer
? "on" : "off");
2870 #define DEFINE_PROP_MIG_CAP(name, x) \
2871 DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
2873 static Property migration_properties
[] = {
2874 DEFINE_PROP_BOOL("store-global-state", MigrationState
,
2875 store_global_state
, true),
2876 DEFINE_PROP_BOOL("only-migratable", MigrationState
, only_migratable
, false),
2877 DEFINE_PROP_BOOL("send-configuration", MigrationState
,
2878 send_configuration
, true),
2879 DEFINE_PROP_BOOL("send-section-footer", MigrationState
,
2880 send_section_footer
, true),
2882 /* Migration parameters */
2883 DEFINE_PROP_UINT8("x-compress-level", MigrationState
,
2884 parameters
.compress_level
,
2885 DEFAULT_MIGRATE_COMPRESS_LEVEL
),
2886 DEFINE_PROP_UINT8("x-compress-threads", MigrationState
,
2887 parameters
.compress_threads
,
2888 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT
),
2889 DEFINE_PROP_UINT8("x-decompress-threads", MigrationState
,
2890 parameters
.decompress_threads
,
2891 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT
),
2892 DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState
,
2893 parameters
.cpu_throttle_initial
,
2894 DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL
),
2895 DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState
,
2896 parameters
.cpu_throttle_increment
,
2897 DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT
),
2898 DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState
,
2899 parameters
.max_bandwidth
, MAX_THROTTLE
),
2900 DEFINE_PROP_UINT64("x-downtime-limit", MigrationState
,
2901 parameters
.downtime_limit
,
2902 DEFAULT_MIGRATE_SET_DOWNTIME
),
2903 DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState
,
2904 parameters
.x_checkpoint_delay
,
2905 DEFAULT_MIGRATE_X_CHECKPOINT_DELAY
),
2906 DEFINE_PROP_UINT8("x-multifd-channels", MigrationState
,
2907 parameters
.x_multifd_channels
,
2908 DEFAULT_MIGRATE_MULTIFD_CHANNELS
),
2909 DEFINE_PROP_UINT32("x-multifd-page-count", MigrationState
,
2910 parameters
.x_multifd_page_count
,
2911 DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT
),
2912 DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState
,
2913 parameters
.xbzrle_cache_size
,
2914 DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE
),
2916 /* Migration capabilities */
2917 DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE
),
2918 DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL
),
2919 DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE
),
2920 DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS
),
2921 DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS
),
2922 DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS
),
2923 DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM
),
2924 DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO
),
2925 DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM
),
2926 DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK
),
2927 DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH
),
2928 DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_X_MULTIFD
),
2930 DEFINE_PROP_END_OF_LIST(),
2933 static void migration_class_init(ObjectClass
*klass
, void *data
)
2935 DeviceClass
*dc
= DEVICE_CLASS(klass
);
2937 dc
->user_creatable
= false;
2938 dc
->props
= migration_properties
;
2941 static void migration_instance_finalize(Object
*obj
)
2943 MigrationState
*ms
= MIGRATION_OBJ(obj
);
2944 MigrationParameters
*params
= &ms
->parameters
;
2946 qemu_mutex_destroy(&ms
->error_mutex
);
2947 g_free(params
->tls_hostname
);
2948 g_free(params
->tls_creds
);
2949 qemu_sem_destroy(&ms
->pause_sem
);
2950 qemu_sem_destroy(&ms
->postcopy_pause_sem
);
2951 qemu_sem_destroy(&ms
->postcopy_pause_rp_sem
);
2952 error_free(ms
->error
);
2955 static void migration_instance_init(Object
*obj
)
2957 MigrationState
*ms
= MIGRATION_OBJ(obj
);
2958 MigrationParameters
*params
= &ms
->parameters
;
2960 ms
->state
= MIGRATION_STATUS_NONE
;
2962 qemu_sem_init(&ms
->pause_sem
, 0);
2963 qemu_mutex_init(&ms
->error_mutex
);
2965 params
->tls_hostname
= g_strdup("");
2966 params
->tls_creds
= g_strdup("");
2968 /* Set has_* up only for parameter checks */
2969 params
->has_compress_level
= true;
2970 params
->has_compress_threads
= true;
2971 params
->has_decompress_threads
= true;
2972 params
->has_cpu_throttle_initial
= true;
2973 params
->has_cpu_throttle_increment
= true;
2974 params
->has_max_bandwidth
= true;
2975 params
->has_downtime_limit
= true;
2976 params
->has_x_checkpoint_delay
= true;
2977 params
->has_block_incremental
= true;
2978 params
->has_x_multifd_channels
= true;
2979 params
->has_x_multifd_page_count
= true;
2980 params
->has_xbzrle_cache_size
= true;
2982 qemu_sem_init(&ms
->postcopy_pause_sem
, 0);
2983 qemu_sem_init(&ms
->postcopy_pause_rp_sem
, 0);
2987 * Return true if check pass, false otherwise. Error will be put
2988 * inside errp if provided.
2990 static bool migration_object_check(MigrationState
*ms
, Error
**errp
)
2992 MigrationCapabilityStatusList
*head
= NULL
;
2993 /* Assuming all off */
2994 bool cap_list
[MIGRATION_CAPABILITY__MAX
] = { 0 }, ret
;
2997 if (!migrate_params_check(&ms
->parameters
, errp
)) {
3001 for (i
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
3002 if (ms
->enabled_capabilities
[i
]) {
3003 head
= migrate_cap_add(head
, i
, true);
3007 ret
= migrate_caps_check(cap_list
, head
, errp
);
3009 /* It works with head == NULL */
3010 qapi_free_MigrationCapabilityStatusList(head
);
3015 static const TypeInfo migration_type
= {
3016 .name
= TYPE_MIGRATION
,
3018 * NOTE: TYPE_MIGRATION is not really a device, as the object is
3019 * not created using qdev_create(), it is not attached to the qdev
3020 * device tree, and it is never realized.
3022 * TODO: Make this TYPE_OBJECT once QOM provides something like
3023 * TYPE_DEVICE's "-global" properties.
3025 .parent
= TYPE_DEVICE
,
3026 .class_init
= migration_class_init
,
3027 .class_size
= sizeof(MigrationClass
),
3028 .instance_size
= sizeof(MigrationState
),
3029 .instance_init
= migration_instance_init
,
3030 .instance_finalize
= migration_instance_finalize
,
3033 static void register_migration_types(void)
3035 type_register_static(&migration_type
);
3038 type_init(register_migration_types
);