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-common.h"
17 #include "qemu/error-report.h"
18 #include "qemu/main-loop.h"
19 #include "migration/migration.h"
20 #include "migration/qemu-file.h"
21 #include "sysemu/sysemu.h"
22 #include "block/block.h"
23 #include "qapi/qmp/qerror.h"
24 #include "qemu/sockets.h"
25 #include "migration/block.h"
26 #include "qemu/thread.h"
27 #include "qmp-commands.h"
29 #include "qapi/util.h"
30 #include "qapi-event.h"
32 #define MAX_THROTTLE (32 << 20) /* Migration speed throttling */
34 /* Amount of time to allocate to each "chunk" of bandwidth-throttled
36 #define BUFFER_DELAY 100
37 #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
39 /* Default compression thread count */
40 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
41 /* Default decompression thread count, usually decompression is at
42 * least 4 times as fast as compression.*/
43 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
44 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */
45 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
47 /* Migration XBZRLE default cache size */
48 #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
50 static NotifierList migration_state_notifiers
=
51 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers
);
53 static bool deferred_incoming
;
55 /* When we add fault tolerance, we could have several
56 migrations at once. For now we don't need to add
57 dynamic creation of migration */
60 MigrationState
*migrate_get_current(void)
62 static MigrationState current_migration
= {
63 .state
= MIGRATION_STATUS_NONE
,
64 .bandwidth_limit
= MAX_THROTTLE
,
65 .xbzrle_cache_size
= DEFAULT_MIGRATE_CACHE_SIZE
,
67 .parameters
[MIGRATION_PARAMETER_COMPRESS_LEVEL
] =
68 DEFAULT_MIGRATE_COMPRESS_LEVEL
,
69 .parameters
[MIGRATION_PARAMETER_COMPRESS_THREADS
] =
70 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT
,
71 .parameters
[MIGRATION_PARAMETER_DECOMPRESS_THREADS
] =
72 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT
,
75 return ¤t_migration
;
79 static MigrationIncomingState
*mis_current
;
81 MigrationIncomingState
*migration_incoming_get_current(void)
86 MigrationIncomingState
*migration_incoming_state_new(QEMUFile
* f
)
88 mis_current
= g_malloc0(sizeof(MigrationIncomingState
));
89 mis_current
->file
= f
;
90 QLIST_INIT(&mis_current
->loadvm_handlers
);
95 void migration_incoming_state_destroy(void)
97 loadvm_free_handlers(mis_current
);
106 uint8_t runstate
[100];
111 static GlobalState global_state
;
113 int global_state_store(void)
115 if (!runstate_store((char *)global_state
.runstate
,
116 sizeof(global_state
.runstate
))) {
117 error_report("runstate name too big: %s", global_state
.runstate
);
118 trace_migrate_state_too_big();
124 static bool global_state_received(void)
126 return global_state
.received
;
129 static RunState
global_state_get_runstate(void)
131 return global_state
.state
;
134 void global_state_set_optional(void)
136 global_state
.optional
= true;
139 static bool global_state_needed(void *opaque
)
141 GlobalState
*s
= opaque
;
142 char *runstate
= (char *)s
->runstate
;
144 /* If it is not optional, it is mandatory */
146 if (s
->optional
== false) {
150 /* If state is running or paused, it is not needed */
152 if (strcmp(runstate
, "running") == 0 ||
153 strcmp(runstate
, "paused") == 0) {
157 /* for any other state it is needed */
161 static int global_state_post_load(void *opaque
, int version_id
)
163 GlobalState
*s
= opaque
;
164 Error
*local_err
= NULL
;
166 char *runstate
= (char *)s
->runstate
;
169 trace_migrate_global_state_post_load(runstate
);
171 r
= qapi_enum_parse(RunState_lookup
, runstate
, RUN_STATE_MAX
,
176 error_report_err(local_err
);
185 static void global_state_pre_save(void *opaque
)
187 GlobalState
*s
= opaque
;
189 trace_migrate_global_state_pre_save((char *)s
->runstate
);
190 s
->size
= strlen((char *)s
->runstate
) + 1;
193 static const VMStateDescription vmstate_globalstate
= {
194 .name
= "globalstate",
196 .minimum_version_id
= 1,
197 .post_load
= global_state_post_load
,
198 .pre_save
= global_state_pre_save
,
199 .needed
= global_state_needed
,
200 .fields
= (VMStateField
[]) {
201 VMSTATE_UINT32(size
, GlobalState
),
202 VMSTATE_BUFFER(runstate
, GlobalState
),
203 VMSTATE_END_OF_LIST()
207 void register_global_state(void)
209 /* We would use it independently that we receive it */
210 strcpy((char *)&global_state
.runstate
, "");
211 global_state
.received
= false;
212 vmstate_register(NULL
, 0, &vmstate_globalstate
, &global_state
);
215 static void migrate_generate_event(int new_state
)
217 if (migrate_use_events()) {
218 qapi_event_send_migration(new_state
, &error_abort
);
223 * Called on -incoming with a defer: uri.
224 * The migration can be started later after any parameters have been
227 static void deferred_incoming_migration(Error
**errp
)
229 if (deferred_incoming
) {
230 error_setg(errp
, "Incoming migration already deferred");
232 deferred_incoming
= true;
235 void qemu_start_incoming_migration(const char *uri
, Error
**errp
)
239 qapi_event_send_migration(MIGRATION_STATUS_SETUP
, &error_abort
);
240 if (!strcmp(uri
, "defer")) {
241 deferred_incoming_migration(errp
);
242 } else if (strstart(uri
, "tcp:", &p
)) {
243 tcp_start_incoming_migration(p
, errp
);
245 } else if (strstart(uri
, "rdma:", &p
)) {
246 rdma_start_incoming_migration(p
, errp
);
249 } else if (strstart(uri
, "exec:", &p
)) {
250 exec_start_incoming_migration(p
, errp
);
251 } else if (strstart(uri
, "unix:", &p
)) {
252 unix_start_incoming_migration(p
, errp
);
253 } else if (strstart(uri
, "fd:", &p
)) {
254 fd_start_incoming_migration(p
, errp
);
257 error_setg(errp
, "unknown migration protocol: %s", uri
);
261 static void process_incoming_migration_co(void *opaque
)
263 QEMUFile
*f
= opaque
;
264 Error
*local_err
= NULL
;
267 migration_incoming_state_new(f
);
268 migrate_generate_event(MIGRATION_STATUS_ACTIVE
);
269 ret
= qemu_loadvm_state(f
);
272 free_xbzrle_decoded_buf();
273 migration_incoming_state_destroy();
276 migrate_generate_event(MIGRATION_STATUS_FAILED
);
277 error_report("load of migration failed: %s", strerror(-ret
));
278 migrate_decompress_threads_join();
281 migrate_generate_event(MIGRATION_STATUS_COMPLETED
);
282 qemu_announce_self();
284 /* Make sure all file formats flush their mutable metadata */
285 bdrv_invalidate_cache_all(&local_err
);
287 error_report_err(local_err
);
288 migrate_decompress_threads_join();
292 /* If global state section was not received or we are in running
293 state, we need to obey autostart. Any other state is set with
296 if (!global_state_received() ||
297 global_state_get_runstate() == RUN_STATE_RUNNING
) {
301 runstate_set(RUN_STATE_PAUSED
);
304 runstate_set(global_state_get_runstate());
306 migrate_decompress_threads_join();
309 void process_incoming_migration(QEMUFile
*f
)
311 Coroutine
*co
= qemu_coroutine_create(process_incoming_migration_co
);
312 int fd
= qemu_get_fd(f
);
315 migrate_decompress_threads_create();
316 qemu_set_nonblock(fd
);
317 qemu_coroutine_enter(co
, f
);
320 /* amount of nanoseconds we are willing to wait for migration to be down.
321 * the choice of nanoseconds is because it is the maximum resolution that
322 * get_clock() can achieve. It is an internal measure. All user-visible
323 * units must be in seconds */
324 static uint64_t max_downtime
= 300000000;
326 uint64_t migrate_max_downtime(void)
331 MigrationCapabilityStatusList
*qmp_query_migrate_capabilities(Error
**errp
)
333 MigrationCapabilityStatusList
*head
= NULL
;
334 MigrationCapabilityStatusList
*caps
;
335 MigrationState
*s
= migrate_get_current();
338 caps
= NULL
; /* silence compiler warning */
339 for (i
= 0; i
< MIGRATION_CAPABILITY_MAX
; i
++) {
341 head
= g_malloc0(sizeof(*caps
));
344 caps
->next
= g_malloc0(sizeof(*caps
));
348 g_malloc(sizeof(*caps
->value
));
349 caps
->value
->capability
= i
;
350 caps
->value
->state
= s
->enabled_capabilities
[i
];
356 MigrationParameters
*qmp_query_migrate_parameters(Error
**errp
)
358 MigrationParameters
*params
;
359 MigrationState
*s
= migrate_get_current();
361 params
= g_malloc0(sizeof(*params
));
362 params
->compress_level
= s
->parameters
[MIGRATION_PARAMETER_COMPRESS_LEVEL
];
363 params
->compress_threads
=
364 s
->parameters
[MIGRATION_PARAMETER_COMPRESS_THREADS
];
365 params
->decompress_threads
=
366 s
->parameters
[MIGRATION_PARAMETER_DECOMPRESS_THREADS
];
371 static void get_xbzrle_cache_stats(MigrationInfo
*info
)
373 if (migrate_use_xbzrle()) {
374 info
->has_xbzrle_cache
= true;
375 info
->xbzrle_cache
= g_malloc0(sizeof(*info
->xbzrle_cache
));
376 info
->xbzrle_cache
->cache_size
= migrate_xbzrle_cache_size();
377 info
->xbzrle_cache
->bytes
= xbzrle_mig_bytes_transferred();
378 info
->xbzrle_cache
->pages
= xbzrle_mig_pages_transferred();
379 info
->xbzrle_cache
->cache_miss
= xbzrle_mig_pages_cache_miss();
380 info
->xbzrle_cache
->cache_miss_rate
= xbzrle_mig_cache_miss_rate();
381 info
->xbzrle_cache
->overflow
= xbzrle_mig_pages_overflow();
385 MigrationInfo
*qmp_query_migrate(Error
**errp
)
387 MigrationInfo
*info
= g_malloc0(sizeof(*info
));
388 MigrationState
*s
= migrate_get_current();
391 case MIGRATION_STATUS_NONE
:
392 /* no migration has happened ever */
394 case MIGRATION_STATUS_SETUP
:
395 info
->has_status
= true;
396 info
->has_total_time
= false;
398 case MIGRATION_STATUS_ACTIVE
:
399 case MIGRATION_STATUS_CANCELLING
:
400 info
->has_status
= true;
401 info
->has_total_time
= true;
402 info
->total_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
)
404 info
->has_expected_downtime
= true;
405 info
->expected_downtime
= s
->expected_downtime
;
406 info
->has_setup_time
= true;
407 info
->setup_time
= s
->setup_time
;
409 info
->has_ram
= true;
410 info
->ram
= g_malloc0(sizeof(*info
->ram
));
411 info
->ram
->transferred
= ram_bytes_transferred();
412 info
->ram
->remaining
= ram_bytes_remaining();
413 info
->ram
->total
= ram_bytes_total();
414 info
->ram
->duplicate
= dup_mig_pages_transferred();
415 info
->ram
->skipped
= skipped_mig_pages_transferred();
416 info
->ram
->normal
= norm_mig_pages_transferred();
417 info
->ram
->normal_bytes
= norm_mig_bytes_transferred();
418 info
->ram
->dirty_pages_rate
= s
->dirty_pages_rate
;
419 info
->ram
->mbps
= s
->mbps
;
420 info
->ram
->dirty_sync_count
= s
->dirty_sync_count
;
422 if (blk_mig_active()) {
423 info
->has_disk
= true;
424 info
->disk
= g_malloc0(sizeof(*info
->disk
));
425 info
->disk
->transferred
= blk_mig_bytes_transferred();
426 info
->disk
->remaining
= blk_mig_bytes_remaining();
427 info
->disk
->total
= blk_mig_bytes_total();
430 get_xbzrle_cache_stats(info
);
432 case MIGRATION_STATUS_COMPLETED
:
433 get_xbzrle_cache_stats(info
);
435 info
->has_status
= true;
436 info
->has_total_time
= true;
437 info
->total_time
= s
->total_time
;
438 info
->has_downtime
= true;
439 info
->downtime
= s
->downtime
;
440 info
->has_setup_time
= true;
441 info
->setup_time
= s
->setup_time
;
443 info
->has_ram
= true;
444 info
->ram
= g_malloc0(sizeof(*info
->ram
));
445 info
->ram
->transferred
= ram_bytes_transferred();
446 info
->ram
->remaining
= 0;
447 info
->ram
->total
= ram_bytes_total();
448 info
->ram
->duplicate
= dup_mig_pages_transferred();
449 info
->ram
->skipped
= skipped_mig_pages_transferred();
450 info
->ram
->normal
= norm_mig_pages_transferred();
451 info
->ram
->normal_bytes
= norm_mig_bytes_transferred();
452 info
->ram
->mbps
= s
->mbps
;
453 info
->ram
->dirty_sync_count
= s
->dirty_sync_count
;
455 case MIGRATION_STATUS_FAILED
:
456 info
->has_status
= true;
458 case MIGRATION_STATUS_CANCELLED
:
459 info
->has_status
= true;
462 info
->status
= s
->state
;
467 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList
*params
,
470 MigrationState
*s
= migrate_get_current();
471 MigrationCapabilityStatusList
*cap
;
473 if (s
->state
== MIGRATION_STATUS_ACTIVE
||
474 s
->state
== MIGRATION_STATUS_SETUP
) {
475 error_setg(errp
, QERR_MIGRATION_ACTIVE
);
479 for (cap
= params
; cap
; cap
= cap
->next
) {
480 s
->enabled_capabilities
[cap
->value
->capability
] = cap
->value
->state
;
484 void qmp_migrate_set_parameters(bool has_compress_level
,
485 int64_t compress_level
,
486 bool has_compress_threads
,
487 int64_t compress_threads
,
488 bool has_decompress_threads
,
489 int64_t decompress_threads
, Error
**errp
)
491 MigrationState
*s
= migrate_get_current();
493 if (has_compress_level
&& (compress_level
< 0 || compress_level
> 9)) {
494 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "compress_level",
495 "is invalid, it should be in the range of 0 to 9");
498 if (has_compress_threads
&&
499 (compress_threads
< 1 || compress_threads
> 255)) {
500 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
502 "is invalid, it should be in the range of 1 to 255");
505 if (has_decompress_threads
&&
506 (decompress_threads
< 1 || decompress_threads
> 255)) {
507 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
508 "decompress_threads",
509 "is invalid, it should be in the range of 1 to 255");
513 if (has_compress_level
) {
514 s
->parameters
[MIGRATION_PARAMETER_COMPRESS_LEVEL
] = compress_level
;
516 if (has_compress_threads
) {
517 s
->parameters
[MIGRATION_PARAMETER_COMPRESS_THREADS
] = compress_threads
;
519 if (has_decompress_threads
) {
520 s
->parameters
[MIGRATION_PARAMETER_DECOMPRESS_THREADS
] =
525 /* shared migration helpers */
527 static void migrate_set_state(MigrationState
*s
, int old_state
, int new_state
)
529 if (atomic_cmpxchg(&s
->state
, old_state
, new_state
) == old_state
) {
530 trace_migrate_set_state(new_state
);
531 migrate_generate_event(new_state
);
535 static void migrate_fd_cleanup(void *opaque
)
537 MigrationState
*s
= opaque
;
539 qemu_bh_delete(s
->cleanup_bh
);
540 s
->cleanup_bh
= NULL
;
543 trace_migrate_fd_cleanup();
544 qemu_mutex_unlock_iothread();
545 qemu_thread_join(&s
->thread
);
546 qemu_mutex_lock_iothread();
548 migrate_compress_threads_join();
549 qemu_fclose(s
->file
);
553 assert(s
->state
!= MIGRATION_STATUS_ACTIVE
);
555 if (s
->state
!= MIGRATION_STATUS_COMPLETED
) {
556 qemu_savevm_state_cancel();
557 if (s
->state
== MIGRATION_STATUS_CANCELLING
) {
558 migrate_set_state(s
, MIGRATION_STATUS_CANCELLING
,
559 MIGRATION_STATUS_CANCELLED
);
563 notifier_list_notify(&migration_state_notifiers
, s
);
566 void migrate_fd_error(MigrationState
*s
)
568 trace_migrate_fd_error();
569 assert(s
->file
== NULL
);
570 migrate_set_state(s
, MIGRATION_STATUS_SETUP
, MIGRATION_STATUS_FAILED
);
571 notifier_list_notify(&migration_state_notifiers
, s
);
574 static void migrate_fd_cancel(MigrationState
*s
)
577 QEMUFile
*f
= migrate_get_current()->file
;
578 trace_migrate_fd_cancel();
581 old_state
= s
->state
;
582 if (old_state
!= MIGRATION_STATUS_SETUP
&&
583 old_state
!= MIGRATION_STATUS_ACTIVE
) {
586 migrate_set_state(s
, old_state
, MIGRATION_STATUS_CANCELLING
);
587 } while (s
->state
!= MIGRATION_STATUS_CANCELLING
);
590 * If we're unlucky the migration code might be stuck somewhere in a
591 * send/write while the network has failed and is waiting to timeout;
592 * if we've got shutdown(2) available then we can force it to quit.
593 * The outgoing qemu file gets closed in migrate_fd_cleanup that is
594 * called in a bh, so there is no race against this cancel.
596 if (s
->state
== MIGRATION_STATUS_CANCELLING
&& f
) {
597 qemu_file_shutdown(f
);
601 void add_migration_state_change_notifier(Notifier
*notify
)
603 notifier_list_add(&migration_state_notifiers
, notify
);
606 void remove_migration_state_change_notifier(Notifier
*notify
)
608 notifier_remove(notify
);
611 bool migration_in_setup(MigrationState
*s
)
613 return s
->state
== MIGRATION_STATUS_SETUP
;
616 bool migration_has_finished(MigrationState
*s
)
618 return s
->state
== MIGRATION_STATUS_COMPLETED
;
621 bool migration_has_failed(MigrationState
*s
)
623 return (s
->state
== MIGRATION_STATUS_CANCELLED
||
624 s
->state
== MIGRATION_STATUS_FAILED
);
627 static MigrationState
*migrate_init(const MigrationParams
*params
)
629 MigrationState
*s
= migrate_get_current();
630 int64_t bandwidth_limit
= s
->bandwidth_limit
;
631 bool enabled_capabilities
[MIGRATION_CAPABILITY_MAX
];
632 int64_t xbzrle_cache_size
= s
->xbzrle_cache_size
;
633 int compress_level
= s
->parameters
[MIGRATION_PARAMETER_COMPRESS_LEVEL
];
634 int compress_thread_count
=
635 s
->parameters
[MIGRATION_PARAMETER_COMPRESS_THREADS
];
636 int decompress_thread_count
=
637 s
->parameters
[MIGRATION_PARAMETER_DECOMPRESS_THREADS
];
639 memcpy(enabled_capabilities
, s
->enabled_capabilities
,
640 sizeof(enabled_capabilities
));
642 memset(s
, 0, sizeof(*s
));
644 memcpy(s
->enabled_capabilities
, enabled_capabilities
,
645 sizeof(enabled_capabilities
));
646 s
->xbzrle_cache_size
= xbzrle_cache_size
;
648 s
->parameters
[MIGRATION_PARAMETER_COMPRESS_LEVEL
] = compress_level
;
649 s
->parameters
[MIGRATION_PARAMETER_COMPRESS_THREADS
] =
650 compress_thread_count
;
651 s
->parameters
[MIGRATION_PARAMETER_DECOMPRESS_THREADS
] =
652 decompress_thread_count
;
653 s
->bandwidth_limit
= bandwidth_limit
;
654 migrate_set_state(s
, MIGRATION_STATUS_NONE
, MIGRATION_STATUS_SETUP
);
656 s
->total_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
660 static GSList
*migration_blockers
;
662 void migrate_add_blocker(Error
*reason
)
664 migration_blockers
= g_slist_prepend(migration_blockers
, reason
);
667 void migrate_del_blocker(Error
*reason
)
669 migration_blockers
= g_slist_remove(migration_blockers
, reason
);
672 void qmp_migrate_incoming(const char *uri
, Error
**errp
)
674 Error
*local_err
= NULL
;
675 static bool once
= true;
677 if (!deferred_incoming
) {
678 error_setg(errp
, "For use with '-incoming defer'");
682 error_setg(errp
, "The incoming migration has already been started");
685 qemu_start_incoming_migration(uri
, &local_err
);
688 error_propagate(errp
, local_err
);
695 void qmp_migrate(const char *uri
, bool has_blk
, bool blk
,
696 bool has_inc
, bool inc
, bool has_detach
, bool detach
,
699 Error
*local_err
= NULL
;
700 MigrationState
*s
= migrate_get_current();
701 MigrationParams params
;
704 params
.blk
= has_blk
&& blk
;
705 params
.shared
= has_inc
&& inc
;
707 if (s
->state
== MIGRATION_STATUS_ACTIVE
||
708 s
->state
== MIGRATION_STATUS_SETUP
||
709 s
->state
== MIGRATION_STATUS_CANCELLING
) {
710 error_setg(errp
, QERR_MIGRATION_ACTIVE
);
713 if (runstate_check(RUN_STATE_INMIGRATE
)) {
714 error_setg(errp
, "Guest is waiting for an incoming migration");
718 if (qemu_savevm_state_blocked(errp
)) {
722 if (migration_blockers
) {
723 *errp
= error_copy(migration_blockers
->data
);
727 /* We are starting a new migration, so we want to start in a clean
728 state. This change is only needed if previous migration
729 failed/was cancelled. We don't use migrate_set_state() because
730 we are setting the initial state, not changing it. */
731 s
->state
= MIGRATION_STATUS_NONE
;
733 s
= migrate_init(¶ms
);
735 if (strstart(uri
, "tcp:", &p
)) {
736 tcp_start_outgoing_migration(s
, p
, &local_err
);
738 } else if (strstart(uri
, "rdma:", &p
)) {
739 rdma_start_outgoing_migration(s
, p
, &local_err
);
742 } else if (strstart(uri
, "exec:", &p
)) {
743 exec_start_outgoing_migration(s
, p
, &local_err
);
744 } else if (strstart(uri
, "unix:", &p
)) {
745 unix_start_outgoing_migration(s
, p
, &local_err
);
746 } else if (strstart(uri
, "fd:", &p
)) {
747 fd_start_outgoing_migration(s
, p
, &local_err
);
750 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "uri",
751 "a valid migration protocol");
752 migrate_set_state(s
, MIGRATION_STATUS_SETUP
, MIGRATION_STATUS_FAILED
);
758 error_propagate(errp
, local_err
);
763 void qmp_migrate_cancel(Error
**errp
)
765 migrate_fd_cancel(migrate_get_current());
768 void qmp_migrate_set_cache_size(int64_t value
, Error
**errp
)
770 MigrationState
*s
= migrate_get_current();
773 /* Check for truncation */
774 if (value
!= (size_t)value
) {
775 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "cache size",
776 "exceeding address space");
780 /* Cache should not be larger than guest ram size */
781 if (value
> ram_bytes_total()) {
782 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "cache size",
783 "exceeds guest ram size ");
787 new_size
= xbzrle_cache_resize(value
);
789 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "cache size",
790 "is smaller than page size");
794 s
->xbzrle_cache_size
= new_size
;
797 int64_t qmp_query_migrate_cache_size(Error
**errp
)
799 return migrate_xbzrle_cache_size();
802 void qmp_migrate_set_speed(int64_t value
, Error
**errp
)
809 if (value
> SIZE_MAX
) {
813 s
= migrate_get_current();
814 s
->bandwidth_limit
= value
;
816 qemu_file_set_rate_limit(s
->file
, s
->bandwidth_limit
/ XFER_LIMIT_RATIO
);
820 void qmp_migrate_set_downtime(double value
, Error
**errp
)
823 value
= MAX(0, MIN(UINT64_MAX
, value
));
824 max_downtime
= (uint64_t)value
;
827 bool migrate_auto_converge(void)
831 s
= migrate_get_current();
833 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_AUTO_CONVERGE
];
836 bool migrate_zero_blocks(void)
840 s
= migrate_get_current();
842 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_ZERO_BLOCKS
];
845 bool migrate_use_compression(void)
849 s
= migrate_get_current();
851 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_COMPRESS
];
854 int migrate_compress_level(void)
858 s
= migrate_get_current();
860 return s
->parameters
[MIGRATION_PARAMETER_COMPRESS_LEVEL
];
863 int migrate_compress_threads(void)
867 s
= migrate_get_current();
869 return s
->parameters
[MIGRATION_PARAMETER_COMPRESS_THREADS
];
872 int migrate_decompress_threads(void)
876 s
= migrate_get_current();
878 return s
->parameters
[MIGRATION_PARAMETER_DECOMPRESS_THREADS
];
881 bool migrate_use_events(void)
885 s
= migrate_get_current();
887 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_EVENTS
];
890 int migrate_use_xbzrle(void)
894 s
= migrate_get_current();
896 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_XBZRLE
];
899 int64_t migrate_xbzrle_cache_size(void)
903 s
= migrate_get_current();
905 return s
->xbzrle_cache_size
;
908 /* migration thread support */
910 static void *migration_thread(void *opaque
)
912 MigrationState
*s
= opaque
;
913 int64_t initial_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
914 int64_t setup_start
= qemu_clock_get_ms(QEMU_CLOCK_HOST
);
915 int64_t initial_bytes
= 0;
916 int64_t max_size
= 0;
917 int64_t start_time
= initial_time
;
918 bool old_vm_running
= false;
920 qemu_savevm_state_header(s
->file
);
921 qemu_savevm_state_begin(s
->file
, &s
->params
);
923 s
->setup_time
= qemu_clock_get_ms(QEMU_CLOCK_HOST
) - setup_start
;
924 migrate_set_state(s
, MIGRATION_STATUS_SETUP
, MIGRATION_STATUS_ACTIVE
);
926 while (s
->state
== MIGRATION_STATUS_ACTIVE
) {
927 int64_t current_time
;
928 uint64_t pending_size
;
930 if (!qemu_file_rate_limit(s
->file
)) {
931 pending_size
= qemu_savevm_state_pending(s
->file
, max_size
);
932 trace_migrate_pending(pending_size
, max_size
);
933 if (pending_size
&& pending_size
>= max_size
) {
934 qemu_savevm_state_iterate(s
->file
);
938 qemu_mutex_lock_iothread();
939 start_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
940 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER
);
941 old_vm_running
= runstate_is_running();
943 ret
= global_state_store();
945 ret
= vm_stop_force_state(RUN_STATE_FINISH_MIGRATE
);
947 qemu_file_set_rate_limit(s
->file
, INT64_MAX
);
948 qemu_savevm_state_complete(s
->file
);
951 qemu_mutex_unlock_iothread();
954 migrate_set_state(s
, MIGRATION_STATUS_ACTIVE
,
955 MIGRATION_STATUS_FAILED
);
959 if (!qemu_file_get_error(s
->file
)) {
960 migrate_set_state(s
, MIGRATION_STATUS_ACTIVE
,
961 MIGRATION_STATUS_COMPLETED
);
967 if (qemu_file_get_error(s
->file
)) {
968 migrate_set_state(s
, MIGRATION_STATUS_ACTIVE
,
969 MIGRATION_STATUS_FAILED
);
972 current_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
973 if (current_time
>= initial_time
+ BUFFER_DELAY
) {
974 uint64_t transferred_bytes
= qemu_ftell(s
->file
) - initial_bytes
;
975 uint64_t time_spent
= current_time
- initial_time
;
976 double bandwidth
= transferred_bytes
/ time_spent
;
977 max_size
= bandwidth
* migrate_max_downtime() / 1000000;
979 s
->mbps
= time_spent
? (((double) transferred_bytes
* 8.0) /
980 ((double) time_spent
/ 1000.0)) / 1000.0 / 1000.0 : -1;
982 trace_migrate_transferred(transferred_bytes
, time_spent
,
983 bandwidth
, max_size
);
984 /* if we haven't sent anything, we don't want to recalculate
985 10000 is a small enough number for our purposes */
986 if (s
->dirty_bytes_rate
&& transferred_bytes
> 10000) {
987 s
->expected_downtime
= s
->dirty_bytes_rate
/ bandwidth
;
990 qemu_file_reset_rate_limit(s
->file
);
991 initial_time
= current_time
;
992 initial_bytes
= qemu_ftell(s
->file
);
994 if (qemu_file_rate_limit(s
->file
)) {
995 /* usleep expects microseconds */
996 g_usleep((initial_time
+ BUFFER_DELAY
- current_time
)*1000);
1000 qemu_mutex_lock_iothread();
1001 if (s
->state
== MIGRATION_STATUS_COMPLETED
) {
1002 int64_t end_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
1003 uint64_t transferred_bytes
= qemu_ftell(s
->file
);
1004 s
->total_time
= end_time
- s
->total_time
;
1005 s
->downtime
= end_time
- start_time
;
1006 if (s
->total_time
) {
1007 s
->mbps
= (((double) transferred_bytes
* 8.0) /
1008 ((double) s
->total_time
)) / 1000;
1010 runstate_set(RUN_STATE_POSTMIGRATE
);
1012 if (old_vm_running
) {
1016 qemu_bh_schedule(s
->cleanup_bh
);
1017 qemu_mutex_unlock_iothread();
1022 void migrate_fd_connect(MigrationState
*s
)
1024 /* This is a best 1st approximation. ns to ms */
1025 s
->expected_downtime
= max_downtime
/1000000;
1026 s
->cleanup_bh
= qemu_bh_new(migrate_fd_cleanup
, s
);
1028 qemu_file_set_rate_limit(s
->file
,
1029 s
->bandwidth_limit
/ XFER_LIMIT_RATIO
);
1031 /* Notify before starting migration thread */
1032 notifier_list_notify(&migration_state_notifiers
, s
);
1034 migrate_compress_threads_create();
1035 qemu_thread_create(&s
->thread
, "migration", migration_thread
, s
,
1036 QEMU_THREAD_JOINABLE
);