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 "qemu/main-loop.h"
20 #include "migration/blocker.h"
24 #include "sysemu/runstate.h"
25 #include "sysemu/sysemu.h"
28 #include "migration/global_state.h"
29 #include "migration/misc.h"
30 #include "migration.h"
32 #include "qemu-file-channel.h"
33 #include "qemu-file.h"
34 #include "migration/vmstate.h"
35 #include "block/block.h"
36 #include "qapi/error.h"
37 #include "qapi/clone-visitor.h"
38 #include "qapi/qapi-visit-sockets.h"
39 #include "qapi/qapi-commands-migration.h"
40 #include "qapi/qapi-events-migration.h"
41 #include "qapi/qmp/qerror.h"
42 #include "qapi/qmp/qnull.h"
45 #include "postcopy-ram.h"
46 #include "qemu/thread.h"
48 #include "exec/target_page.h"
49 #include "io/channel-buffer.h"
50 #include "migration/colo.h"
51 #include "hw/boards.h"
52 #include "hw/qdev-properties.h"
53 #include "monitor/monitor.h"
54 #include "net/announce.h"
55 #include "qemu/queue.h"
58 #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */
60 /* Amount of time to allocate to each "chunk" of bandwidth-throttled
62 #define BUFFER_DELAY 100
63 #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
65 /* Time in milliseconds we are allowed to stop the source,
66 * for sending the last part */
67 #define DEFAULT_MIGRATE_SET_DOWNTIME 300
69 /* Maximum migrate downtime set to 2000 seconds */
70 #define MAX_MIGRATE_DOWNTIME_SECONDS 2000
71 #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
73 /* Default compression thread count */
74 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
75 /* Default decompression thread count, usually decompression is at
76 * least 4 times as fast as compression.*/
77 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
78 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */
79 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
80 /* Define default autoconverge cpu throttle migration parameters */
81 #define DEFAULT_MIGRATE_THROTTLE_TRIGGER_THRESHOLD 50
82 #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
83 #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
84 #define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99
86 /* Migration XBZRLE default cache size */
87 #define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
89 /* The delay time (in ms) between two COLO checkpoints */
90 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100)
91 #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
92 #define DEFAULT_MIGRATE_MULTIFD_COMPRESSION MULTIFD_COMPRESSION_NONE
93 /* 0: means nocompress, 1: best speed, ... 9: best compress ratio */
94 #define DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL 1
95 /* 0: means nocompress, 1: best speed, ... 20: best compress ratio */
96 #define DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL 1
98 /* Background transfer rate for postcopy, 0 means unlimited, note
99 * that page requests can still exceed this limit.
101 #define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0
104 * Parameters for self_announce_delay giving a stream of RARP/ARP
105 * packets after migration.
107 #define DEFAULT_MIGRATE_ANNOUNCE_INITIAL 50
108 #define DEFAULT_MIGRATE_ANNOUNCE_MAX 550
109 #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5
110 #define DEFAULT_MIGRATE_ANNOUNCE_STEP 100
112 static NotifierList migration_state_notifiers
=
113 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers
);
115 static bool deferred_incoming
;
117 /* Messages sent on the return path from destination to source */
118 enum mig_rp_message_type
{
119 MIG_RP_MSG_INVALID
= 0, /* Must be 0 */
120 MIG_RP_MSG_SHUT
, /* sibling will not send any more RP messages */
121 MIG_RP_MSG_PONG
, /* Response to a PING; data (seq: be32 ) */
123 MIG_RP_MSG_REQ_PAGES_ID
, /* data (start: be64, len: be32, id: string) */
124 MIG_RP_MSG_REQ_PAGES
, /* data (start: be64, len: be32) */
125 MIG_RP_MSG_RECV_BITMAP
, /* send recved_bitmap back to source */
126 MIG_RP_MSG_RESUME_ACK
, /* tell source that we are ready to resume */
131 /* When we add fault tolerance, we could have several
132 migrations at once. For now we don't need to add
133 dynamic creation of migration */
135 static MigrationState
*current_migration
;
136 static MigrationIncomingState
*current_incoming
;
138 static bool migration_object_check(MigrationState
*ms
, Error
**errp
);
139 static int migration_maybe_pause(MigrationState
*s
,
140 int *current_active_state
,
142 static void migrate_fd_cancel(MigrationState
*s
);
144 void migration_object_init(void)
146 MachineState
*ms
= MACHINE(qdev_get_machine());
149 /* This can only be called once. */
150 assert(!current_migration
);
151 current_migration
= MIGRATION_OBJ(object_new(TYPE_MIGRATION
));
154 * Init the migrate incoming object as well no matter whether
155 * we'll use it or not.
157 assert(!current_incoming
);
158 current_incoming
= g_new0(MigrationIncomingState
, 1);
159 current_incoming
->state
= MIGRATION_STATUS_NONE
;
160 current_incoming
->postcopy_remote_fds
=
161 g_array_new(FALSE
, TRUE
, sizeof(struct PostCopyFD
));
162 qemu_mutex_init(¤t_incoming
->rp_mutex
);
163 qemu_event_init(¤t_incoming
->main_thread_load_event
, false);
164 qemu_sem_init(¤t_incoming
->postcopy_pause_sem_dst
, 0);
165 qemu_sem_init(¤t_incoming
->postcopy_pause_sem_fault
, 0);
167 init_dirty_bitmap_incoming_migration();
169 if (!migration_object_check(current_migration
, &err
)) {
170 error_report_err(err
);
175 * We cannot really do this in migration_instance_init() since at
176 * that time global properties are not yet applied, then this
177 * value will be definitely replaced by something else.
179 if (ms
->enforce_config_section
) {
180 current_migration
->send_configuration
= true;
184 void migration_shutdown(void)
187 * Cancel the current migration - that will (eventually)
188 * stop the migration using this structure
190 migrate_fd_cancel(current_migration
);
191 object_unref(OBJECT(current_migration
));
195 MigrationState
*migrate_get_current(void)
197 /* This can only be called after the object created. */
198 assert(current_migration
);
199 return current_migration
;
202 MigrationIncomingState
*migration_incoming_get_current(void)
204 assert(current_incoming
);
205 return current_incoming
;
208 void migration_incoming_state_destroy(void)
210 struct MigrationIncomingState
*mis
= migration_incoming_get_current();
212 if (mis
->to_src_file
) {
213 /* Tell source that we are done */
214 migrate_send_rp_shut(mis
, qemu_file_get_error(mis
->from_src_file
) != 0);
215 qemu_fclose(mis
->to_src_file
);
216 mis
->to_src_file
= NULL
;
219 if (mis
->from_src_file
) {
220 qemu_fclose(mis
->from_src_file
);
221 mis
->from_src_file
= NULL
;
223 if (mis
->postcopy_remote_fds
) {
224 g_array_free(mis
->postcopy_remote_fds
, TRUE
);
225 mis
->postcopy_remote_fds
= NULL
;
228 qemu_event_reset(&mis
->main_thread_load_event
);
230 if (mis
->socket_address_list
) {
231 qapi_free_SocketAddressList(mis
->socket_address_list
);
232 mis
->socket_address_list
= NULL
;
236 static void migrate_generate_event(int new_state
)
238 if (migrate_use_events()) {
239 qapi_event_send_migration(new_state
);
243 static bool migrate_late_block_activate(void)
247 s
= migrate_get_current();
249 return s
->enabled_capabilities
[
250 MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE
];
254 * Called on -incoming with a defer: uri.
255 * The migration can be started later after any parameters have been
258 static void deferred_incoming_migration(Error
**errp
)
260 if (deferred_incoming
) {
261 error_setg(errp
, "Incoming migration already deferred");
263 deferred_incoming
= true;
267 * Send a message on the return channel back to the source
270 static int migrate_send_rp_message(MigrationIncomingState
*mis
,
271 enum mig_rp_message_type message_type
,
272 uint16_t len
, void *data
)
276 trace_migrate_send_rp_message((int)message_type
, len
);
277 qemu_mutex_lock(&mis
->rp_mutex
);
280 * It's possible that the file handle got lost due to network
283 if (!mis
->to_src_file
) {
288 qemu_put_be16(mis
->to_src_file
, (unsigned int)message_type
);
289 qemu_put_be16(mis
->to_src_file
, len
);
290 qemu_put_buffer(mis
->to_src_file
, data
, len
);
291 qemu_fflush(mis
->to_src_file
);
293 /* It's possible that qemu file got error during sending */
294 ret
= qemu_file_get_error(mis
->to_src_file
);
297 qemu_mutex_unlock(&mis
->rp_mutex
);
301 /* Request a range of pages from the source VM at the given
303 * rbname: Name of the RAMBlock to request the page in, if NULL it's the same
304 * as the last request (a name must have been given previously)
305 * Start: Address offset within the RB
306 * Len: Length in bytes required - must be a multiple of pagesize
308 int migrate_send_rp_req_pages(MigrationIncomingState
*mis
, const char *rbname
,
309 ram_addr_t start
, size_t len
)
311 uint8_t bufc
[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */
312 size_t msglen
= 12; /* start + len */
313 enum mig_rp_message_type msg_type
;
315 *(uint64_t *)bufc
= cpu_to_be64((uint64_t)start
);
316 *(uint32_t *)(bufc
+ 8) = cpu_to_be32((uint32_t)len
);
319 int rbname_len
= strlen(rbname
);
320 assert(rbname_len
< 256);
322 bufc
[msglen
++] = rbname_len
;
323 memcpy(bufc
+ msglen
, rbname
, rbname_len
);
324 msglen
+= rbname_len
;
325 msg_type
= MIG_RP_MSG_REQ_PAGES_ID
;
327 msg_type
= MIG_RP_MSG_REQ_PAGES
;
330 return migrate_send_rp_message(mis
, msg_type
, msglen
, bufc
);
333 static bool migration_colo_enabled
;
334 bool migration_incoming_colo_enabled(void)
336 return migration_colo_enabled
;
339 void migration_incoming_disable_colo(void)
341 migration_colo_enabled
= false;
344 void migration_incoming_enable_colo(void)
346 migration_colo_enabled
= true;
349 void migrate_add_address(SocketAddress
*address
)
351 MigrationIncomingState
*mis
= migration_incoming_get_current();
352 SocketAddressList
*addrs
;
354 addrs
= g_new0(SocketAddressList
, 1);
355 addrs
->next
= mis
->socket_address_list
;
356 mis
->socket_address_list
= addrs
;
357 addrs
->value
= QAPI_CLONE(SocketAddress
, address
);
360 void qemu_start_incoming_migration(const char *uri
, Error
**errp
)
364 qapi_event_send_migration(MIGRATION_STATUS_SETUP
);
365 if (!strcmp(uri
, "defer")) {
366 deferred_incoming_migration(errp
);
367 } else if (strstart(uri
, "tcp:", &p
)) {
368 tcp_start_incoming_migration(p
, errp
);
370 } else if (strstart(uri
, "rdma:", &p
)) {
371 rdma_start_incoming_migration(p
, errp
);
373 } else if (strstart(uri
, "exec:", &p
)) {
374 exec_start_incoming_migration(p
, errp
);
375 } else if (strstart(uri
, "unix:", &p
)) {
376 unix_start_incoming_migration(p
, errp
);
377 } else if (strstart(uri
, "fd:", &p
)) {
378 fd_start_incoming_migration(p
, errp
);
380 error_setg(errp
, "unknown migration protocol: %s", uri
);
384 static void process_incoming_migration_bh(void *opaque
)
386 Error
*local_err
= NULL
;
387 MigrationIncomingState
*mis
= opaque
;
389 /* If capability late_block_activate is set:
390 * Only fire up the block code now if we're going to restart the
391 * VM, else 'cont' will do it.
392 * This causes file locking to happen; so we don't want it to happen
393 * unless we really are starting the VM.
395 if (!migrate_late_block_activate() ||
396 (autostart
&& (!global_state_received() ||
397 global_state_get_runstate() == RUN_STATE_RUNNING
))) {
398 /* Make sure all file formats flush their mutable metadata.
399 * If we get an error here, just don't restart the VM yet. */
400 bdrv_invalidate_cache_all(&local_err
);
402 error_report_err(local_err
);
409 * This must happen after all error conditions are dealt with and
410 * we're sure the VM is going to be running on this host.
412 qemu_announce_self(&mis
->announce_timer
, migrate_announce_params());
414 if (multifd_load_cleanup(&local_err
) != 0) {
415 error_report_err(local_err
);
418 /* If global state section was not received or we are in running
419 state, we need to obey autostart. Any other state is set with
422 dirty_bitmap_mig_before_vm_start();
424 if (!global_state_received() ||
425 global_state_get_runstate() == RUN_STATE_RUNNING
) {
429 runstate_set(RUN_STATE_PAUSED
);
431 } else if (migration_incoming_colo_enabled()) {
432 migration_incoming_disable_colo();
435 runstate_set(global_state_get_runstate());
438 * This must happen after any state changes since as soon as an external
439 * observer sees this event they might start to prod at the VM assuming
442 migrate_set_state(&mis
->state
, MIGRATION_STATUS_ACTIVE
,
443 MIGRATION_STATUS_COMPLETED
);
444 qemu_bh_delete(mis
->bh
);
445 migration_incoming_state_destroy();
448 static void process_incoming_migration_co(void *opaque
)
450 MigrationIncomingState
*mis
= migration_incoming_get_current();
453 Error
*local_err
= NULL
;
455 assert(mis
->from_src_file
);
456 mis
->migration_incoming_co
= qemu_coroutine_self();
457 mis
->largest_page_size
= qemu_ram_pagesize_largest();
458 postcopy_state_set(POSTCOPY_INCOMING_NONE
);
459 migrate_set_state(&mis
->state
, MIGRATION_STATUS_NONE
,
460 MIGRATION_STATUS_ACTIVE
);
461 ret
= qemu_loadvm_state(mis
->from_src_file
);
463 ps
= postcopy_state_get();
464 trace_process_incoming_migration_co_end(ret
, ps
);
465 if (ps
!= POSTCOPY_INCOMING_NONE
) {
466 if (ps
== POSTCOPY_INCOMING_ADVISE
) {
468 * Where a migration had postcopy enabled (and thus went to advise)
469 * but managed to complete within the precopy period, we can use
472 postcopy_ram_incoming_cleanup(mis
);
473 } else if (ret
>= 0) {
475 * Postcopy was started, cleanup should happen at the end of the
478 trace_process_incoming_migration_co_postcopy_end_main();
481 /* Else if something went wrong then just fall out of the normal exit */
484 /* we get COLO info, and know if we are in COLO mode */
485 if (!ret
&& migration_incoming_colo_enabled()) {
486 /* Make sure all file formats flush their mutable metadata */
487 bdrv_invalidate_cache_all(&local_err
);
489 error_report_err(local_err
);
493 qemu_thread_create(&mis
->colo_incoming_thread
, "COLO incoming",
494 colo_process_incoming_thread
, mis
, QEMU_THREAD_JOINABLE
);
495 mis
->have_colo_incoming_thread
= true;
496 qemu_coroutine_yield();
498 /* Wait checkpoint incoming thread exit before free resource */
499 qemu_thread_join(&mis
->colo_incoming_thread
);
500 /* We hold the global iothread lock, so it is safe here */
501 colo_release_ram_cache();
505 error_report("load of migration failed: %s", strerror(-ret
));
508 mis
->bh
= qemu_bh_new(process_incoming_migration_bh
, mis
);
509 qemu_bh_schedule(mis
->bh
);
510 mis
->migration_incoming_co
= NULL
;
514 migrate_set_state(&mis
->state
, MIGRATION_STATUS_ACTIVE
,
515 MIGRATION_STATUS_FAILED
);
516 qemu_fclose(mis
->from_src_file
);
517 if (multifd_load_cleanup(&local_err
) != 0) {
518 error_report_err(local_err
);
524 * @migration_incoming_setup: Setup incoming migration
526 * Returns 0 for no error or 1 for error
528 * @f: file for main migration channel
529 * @errp: where to put errors
531 static int migration_incoming_setup(QEMUFile
*f
, Error
**errp
)
533 MigrationIncomingState
*mis
= migration_incoming_get_current();
534 Error
*local_err
= NULL
;
536 if (multifd_load_setup(&local_err
) != 0) {
537 /* We haven't been able to create multifd threads
538 nothing better to do */
539 error_report_err(local_err
);
543 if (!mis
->from_src_file
) {
544 mis
->from_src_file
= f
;
546 qemu_file_set_blocking(f
, false);
550 void migration_incoming_process(void)
552 Coroutine
*co
= qemu_coroutine_create(process_incoming_migration_co
, NULL
);
553 qemu_coroutine_enter(co
);
556 /* Returns true if recovered from a paused migration, otherwise false */
557 static bool postcopy_try_recover(QEMUFile
*f
)
559 MigrationIncomingState
*mis
= migration_incoming_get_current();
561 if (mis
->state
== MIGRATION_STATUS_POSTCOPY_PAUSED
) {
562 /* Resumed from a paused postcopy migration */
564 mis
->from_src_file
= f
;
565 /* Postcopy has standalone thread to do vm load */
566 qemu_file_set_blocking(f
, true);
568 /* Re-configure the return path */
569 mis
->to_src_file
= qemu_file_get_return_path(f
);
571 migrate_set_state(&mis
->state
, MIGRATION_STATUS_POSTCOPY_PAUSED
,
572 MIGRATION_STATUS_POSTCOPY_RECOVER
);
575 * Here, we only wake up the main loading thread (while the
576 * fault thread will still be waiting), so that we can receive
577 * commands from source now, and answer it if needed. The
578 * fault thread will be woken up afterwards until we are sure
579 * that source is ready to reply to page requests.
581 qemu_sem_post(&mis
->postcopy_pause_sem_dst
);
588 void migration_fd_process_incoming(QEMUFile
*f
, Error
**errp
)
590 Error
*local_err
= NULL
;
592 if (postcopy_try_recover(f
)) {
596 if (migration_incoming_setup(f
, &local_err
)) {
598 error_propagate(errp
, local_err
);
602 migration_incoming_process();
605 void migration_ioc_process_incoming(QIOChannel
*ioc
, Error
**errp
)
607 MigrationIncomingState
*mis
= migration_incoming_get_current();
608 Error
*local_err
= NULL
;
609 bool start_migration
;
611 if (!mis
->from_src_file
) {
612 /* The first connection (multifd may have multiple) */
613 QEMUFile
*f
= qemu_fopen_channel_input(ioc
);
615 /* If it's a recovery, we're done */
616 if (postcopy_try_recover(f
)) {
620 if (migration_incoming_setup(f
, &local_err
)) {
622 error_propagate(errp
, local_err
);
628 * Common migration only needs one channel, so we can start
629 * right now. Multifd needs more than one channel, we wait.
631 start_migration
= !migrate_use_multifd();
633 /* Multiple connections */
634 assert(migrate_use_multifd());
635 start_migration
= multifd_recv_new_channel(ioc
, &local_err
);
637 error_propagate(errp
, local_err
);
642 if (start_migration
) {
643 migration_incoming_process();
648 * @migration_has_all_channels: We have received all channels that we need
650 * Returns true when we have got connections to all the channels that
651 * we need for migration.
653 bool migration_has_all_channels(void)
655 MigrationIncomingState
*mis
= migration_incoming_get_current();
658 all_channels
= multifd_recv_all_channels_created();
660 return all_channels
&& mis
->from_src_file
!= NULL
;
664 * Send a 'SHUT' message on the return channel with the given value
665 * to indicate that we've finished with the RP. Non-0 value indicates
668 void migrate_send_rp_shut(MigrationIncomingState
*mis
,
673 buf
= cpu_to_be32(value
);
674 migrate_send_rp_message(mis
, MIG_RP_MSG_SHUT
, sizeof(buf
), &buf
);
678 * Send a 'PONG' message on the return channel with the given value
679 * (normally in response to a 'PING')
681 void migrate_send_rp_pong(MigrationIncomingState
*mis
,
686 buf
= cpu_to_be32(value
);
687 migrate_send_rp_message(mis
, MIG_RP_MSG_PONG
, sizeof(buf
), &buf
);
690 void migrate_send_rp_recv_bitmap(MigrationIncomingState
*mis
,
698 * First, we send the header part. It contains only the len of
699 * idstr, and the idstr itself.
701 len
= strlen(block_name
);
703 memcpy(buf
+ 1, block_name
, len
);
705 if (mis
->state
!= MIGRATION_STATUS_POSTCOPY_RECOVER
) {
706 error_report("%s: MSG_RP_RECV_BITMAP only used for recovery",
711 migrate_send_rp_message(mis
, MIG_RP_MSG_RECV_BITMAP
, len
+ 1, buf
);
714 * Next, we dump the received bitmap to the stream.
716 * TODO: currently we are safe since we are the only one that is
717 * using the to_src_file handle (fault thread is still paused),
718 * and it's ok even not taking the mutex. However the best way is
719 * to take the lock before sending the message header, and release
720 * the lock after sending the bitmap.
722 qemu_mutex_lock(&mis
->rp_mutex
);
723 res
= ramblock_recv_bitmap_send(mis
->to_src_file
, block_name
);
724 qemu_mutex_unlock(&mis
->rp_mutex
);
726 trace_migrate_send_rp_recv_bitmap(block_name
, res
);
729 void migrate_send_rp_resume_ack(MigrationIncomingState
*mis
, uint32_t value
)
733 buf
= cpu_to_be32(value
);
734 migrate_send_rp_message(mis
, MIG_RP_MSG_RESUME_ACK
, sizeof(buf
), &buf
);
737 MigrationCapabilityStatusList
*qmp_query_migrate_capabilities(Error
**errp
)
739 MigrationCapabilityStatusList
*head
= NULL
;
740 MigrationCapabilityStatusList
*caps
;
741 MigrationState
*s
= migrate_get_current();
744 caps
= NULL
; /* silence compiler warning */
745 for (i
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
746 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
747 if (i
== MIGRATION_CAPABILITY_BLOCK
) {
752 head
= g_malloc0(sizeof(*caps
));
755 caps
->next
= g_malloc0(sizeof(*caps
));
759 g_malloc(sizeof(*caps
->value
));
760 caps
->value
->capability
= i
;
761 caps
->value
->state
= s
->enabled_capabilities
[i
];
767 MigrationParameters
*qmp_query_migrate_parameters(Error
**errp
)
769 MigrationParameters
*params
;
770 MigrationState
*s
= migrate_get_current();
772 /* TODO use QAPI_CLONE() instead of duplicating it inline */
773 params
= g_malloc0(sizeof(*params
));
774 params
->has_compress_level
= true;
775 params
->compress_level
= s
->parameters
.compress_level
;
776 params
->has_compress_threads
= true;
777 params
->compress_threads
= s
->parameters
.compress_threads
;
778 params
->has_compress_wait_thread
= true;
779 params
->compress_wait_thread
= s
->parameters
.compress_wait_thread
;
780 params
->has_decompress_threads
= true;
781 params
->decompress_threads
= s
->parameters
.decompress_threads
;
782 params
->has_throttle_trigger_threshold
= true;
783 params
->throttle_trigger_threshold
= s
->parameters
.throttle_trigger_threshold
;
784 params
->has_cpu_throttle_initial
= true;
785 params
->cpu_throttle_initial
= s
->parameters
.cpu_throttle_initial
;
786 params
->has_cpu_throttle_increment
= true;
787 params
->cpu_throttle_increment
= s
->parameters
.cpu_throttle_increment
;
788 params
->has_tls_creds
= true;
789 params
->tls_creds
= g_strdup(s
->parameters
.tls_creds
);
790 params
->has_tls_hostname
= true;
791 params
->tls_hostname
= g_strdup(s
->parameters
.tls_hostname
);
792 params
->has_tls_authz
= true;
793 params
->tls_authz
= g_strdup(s
->parameters
.tls_authz
?
794 s
->parameters
.tls_authz
: "");
795 params
->has_max_bandwidth
= true;
796 params
->max_bandwidth
= s
->parameters
.max_bandwidth
;
797 params
->has_downtime_limit
= true;
798 params
->downtime_limit
= s
->parameters
.downtime_limit
;
799 params
->has_x_checkpoint_delay
= true;
800 params
->x_checkpoint_delay
= s
->parameters
.x_checkpoint_delay
;
801 params
->has_block_incremental
= true;
802 params
->block_incremental
= s
->parameters
.block_incremental
;
803 params
->has_multifd_channels
= true;
804 params
->multifd_channels
= s
->parameters
.multifd_channels
;
805 params
->has_multifd_compression
= true;
806 params
->multifd_compression
= s
->parameters
.multifd_compression
;
807 params
->has_multifd_zlib_level
= true;
808 params
->multifd_zlib_level
= s
->parameters
.multifd_zlib_level
;
809 params
->has_multifd_zstd_level
= true;
810 params
->multifd_zstd_level
= s
->parameters
.multifd_zstd_level
;
811 params
->has_xbzrle_cache_size
= true;
812 params
->xbzrle_cache_size
= s
->parameters
.xbzrle_cache_size
;
813 params
->has_max_postcopy_bandwidth
= true;
814 params
->max_postcopy_bandwidth
= s
->parameters
.max_postcopy_bandwidth
;
815 params
->has_max_cpu_throttle
= true;
816 params
->max_cpu_throttle
= s
->parameters
.max_cpu_throttle
;
817 params
->has_announce_initial
= true;
818 params
->announce_initial
= s
->parameters
.announce_initial
;
819 params
->has_announce_max
= true;
820 params
->announce_max
= s
->parameters
.announce_max
;
821 params
->has_announce_rounds
= true;
822 params
->announce_rounds
= s
->parameters
.announce_rounds
;
823 params
->has_announce_step
= true;
824 params
->announce_step
= s
->parameters
.announce_step
;
829 AnnounceParameters
*migrate_announce_params(void)
831 static AnnounceParameters ap
;
833 MigrationState
*s
= migrate_get_current();
835 ap
.initial
= s
->parameters
.announce_initial
;
836 ap
.max
= s
->parameters
.announce_max
;
837 ap
.rounds
= s
->parameters
.announce_rounds
;
838 ap
.step
= s
->parameters
.announce_step
;
844 * Return true if we're already in the middle of a migration
845 * (i.e. any of the active or setup states)
847 bool migration_is_setup_or_active(int state
)
850 case MIGRATION_STATUS_ACTIVE
:
851 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
852 case MIGRATION_STATUS_POSTCOPY_PAUSED
:
853 case MIGRATION_STATUS_POSTCOPY_RECOVER
:
854 case MIGRATION_STATUS_SETUP
:
855 case MIGRATION_STATUS_PRE_SWITCHOVER
:
856 case MIGRATION_STATUS_DEVICE
:
857 case MIGRATION_STATUS_WAIT_UNPLUG
:
858 case MIGRATION_STATUS_COLO
:
867 bool migration_is_running(int state
)
870 case MIGRATION_STATUS_ACTIVE
:
871 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
872 case MIGRATION_STATUS_POSTCOPY_PAUSED
:
873 case MIGRATION_STATUS_POSTCOPY_RECOVER
:
874 case MIGRATION_STATUS_SETUP
:
875 case MIGRATION_STATUS_PRE_SWITCHOVER
:
876 case MIGRATION_STATUS_DEVICE
:
877 case MIGRATION_STATUS_WAIT_UNPLUG
:
878 case MIGRATION_STATUS_CANCELLING
:
887 static void populate_time_info(MigrationInfo
*info
, MigrationState
*s
)
889 info
->has_status
= true;
890 info
->has_setup_time
= true;
891 info
->setup_time
= s
->setup_time
;
892 if (s
->state
== MIGRATION_STATUS_COMPLETED
) {
893 info
->has_total_time
= true;
894 info
->total_time
= s
->total_time
;
895 info
->has_downtime
= true;
896 info
->downtime
= s
->downtime
;
898 info
->has_total_time
= true;
899 info
->total_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
) -
901 info
->has_expected_downtime
= true;
902 info
->expected_downtime
= s
->expected_downtime
;
906 static void populate_ram_info(MigrationInfo
*info
, MigrationState
*s
)
908 info
->has_ram
= true;
909 info
->ram
= g_malloc0(sizeof(*info
->ram
));
910 info
->ram
->transferred
= ram_counters
.transferred
;
911 info
->ram
->total
= ram_bytes_total();
912 info
->ram
->duplicate
= ram_counters
.duplicate
;
913 /* legacy value. It is not used anymore */
914 info
->ram
->skipped
= 0;
915 info
->ram
->normal
= ram_counters
.normal
;
916 info
->ram
->normal_bytes
= ram_counters
.normal
*
917 qemu_target_page_size();
918 info
->ram
->mbps
= s
->mbps
;
919 info
->ram
->dirty_sync_count
= ram_counters
.dirty_sync_count
;
920 info
->ram
->postcopy_requests
= ram_counters
.postcopy_requests
;
921 info
->ram
->page_size
= qemu_target_page_size();
922 info
->ram
->multifd_bytes
= ram_counters
.multifd_bytes
;
923 info
->ram
->pages_per_second
= s
->pages_per_second
;
925 if (migrate_use_xbzrle()) {
926 info
->has_xbzrle_cache
= true;
927 info
->xbzrle_cache
= g_malloc0(sizeof(*info
->xbzrle_cache
));
928 info
->xbzrle_cache
->cache_size
= migrate_xbzrle_cache_size();
929 info
->xbzrle_cache
->bytes
= xbzrle_counters
.bytes
;
930 info
->xbzrle_cache
->pages
= xbzrle_counters
.pages
;
931 info
->xbzrle_cache
->cache_miss
= xbzrle_counters
.cache_miss
;
932 info
->xbzrle_cache
->cache_miss_rate
= xbzrle_counters
.cache_miss_rate
;
933 info
->xbzrle_cache
->overflow
= xbzrle_counters
.overflow
;
936 if (migrate_use_compression()) {
937 info
->has_compression
= true;
938 info
->compression
= g_malloc0(sizeof(*info
->compression
));
939 info
->compression
->pages
= compression_counters
.pages
;
940 info
->compression
->busy
= compression_counters
.busy
;
941 info
->compression
->busy_rate
= compression_counters
.busy_rate
;
942 info
->compression
->compressed_size
=
943 compression_counters
.compressed_size
;
944 info
->compression
->compression_rate
=
945 compression_counters
.compression_rate
;
948 if (cpu_throttle_active()) {
949 info
->has_cpu_throttle_percentage
= true;
950 info
->cpu_throttle_percentage
= cpu_throttle_get_percentage();
953 if (s
->state
!= MIGRATION_STATUS_COMPLETED
) {
954 info
->ram
->remaining
= ram_bytes_remaining();
955 info
->ram
->dirty_pages_rate
= ram_counters
.dirty_pages_rate
;
959 static void populate_disk_info(MigrationInfo
*info
)
961 if (blk_mig_active()) {
962 info
->has_disk
= true;
963 info
->disk
= g_malloc0(sizeof(*info
->disk
));
964 info
->disk
->transferred
= blk_mig_bytes_transferred();
965 info
->disk
->remaining
= blk_mig_bytes_remaining();
966 info
->disk
->total
= blk_mig_bytes_total();
970 static void fill_source_migration_info(MigrationInfo
*info
)
972 MigrationState
*s
= migrate_get_current();
975 case MIGRATION_STATUS_NONE
:
976 /* no migration has happened ever */
977 /* do not overwrite destination migration status */
980 case MIGRATION_STATUS_SETUP
:
981 info
->has_status
= true;
982 info
->has_total_time
= false;
984 case MIGRATION_STATUS_ACTIVE
:
985 case MIGRATION_STATUS_CANCELLING
:
986 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
987 case MIGRATION_STATUS_PRE_SWITCHOVER
:
988 case MIGRATION_STATUS_DEVICE
:
989 case MIGRATION_STATUS_POSTCOPY_PAUSED
:
990 case MIGRATION_STATUS_POSTCOPY_RECOVER
:
991 /* TODO add some postcopy stats */
992 populate_time_info(info
, s
);
993 populate_ram_info(info
, s
);
994 populate_disk_info(info
);
996 case MIGRATION_STATUS_COLO
:
997 info
->has_status
= true;
998 /* TODO: display COLO specific information (checkpoint info etc.) */
1000 case MIGRATION_STATUS_COMPLETED
:
1001 populate_time_info(info
, s
);
1002 populate_ram_info(info
, s
);
1004 case MIGRATION_STATUS_FAILED
:
1005 info
->has_status
= true;
1007 info
->has_error_desc
= true;
1008 info
->error_desc
= g_strdup(error_get_pretty(s
->error
));
1011 case MIGRATION_STATUS_CANCELLED
:
1012 info
->has_status
= true;
1014 case MIGRATION_STATUS_WAIT_UNPLUG
:
1015 info
->has_status
= true;
1018 info
->status
= s
->state
;
1022 * @migration_caps_check - check capability validity
1024 * @cap_list: old capability list, array of bool
1025 * @params: new capabilities to be applied soon
1026 * @errp: set *errp if the check failed, with reason
1028 * Returns true if check passed, otherwise false.
1030 static bool migrate_caps_check(bool *cap_list
,
1031 MigrationCapabilityStatusList
*params
,
1034 MigrationCapabilityStatusList
*cap
;
1035 bool old_postcopy_cap
;
1036 MigrationIncomingState
*mis
= migration_incoming_get_current();
1038 old_postcopy_cap
= cap_list
[MIGRATION_CAPABILITY_POSTCOPY_RAM
];
1040 for (cap
= params
; cap
; cap
= cap
->next
) {
1041 cap_list
[cap
->value
->capability
] = cap
->value
->state
;
1044 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
1045 if (cap_list
[MIGRATION_CAPABILITY_BLOCK
]) {
1046 error_setg(errp
, "QEMU compiled without old-style (blk/-b, inc/-i) "
1048 error_append_hint(errp
, "Use drive_mirror+NBD instead.\n");
1053 #ifndef CONFIG_REPLICATION
1054 if (cap_list
[MIGRATION_CAPABILITY_X_COLO
]) {
1055 error_setg(errp
, "QEMU compiled without replication module"
1056 " can't enable COLO");
1057 error_append_hint(errp
, "Please enable replication before COLO.\n");
1062 if (cap_list
[MIGRATION_CAPABILITY_POSTCOPY_RAM
]) {
1063 /* This check is reasonably expensive, so only when it's being
1064 * set the first time, also it's only the destination that needs
1067 if (!old_postcopy_cap
&& runstate_check(RUN_STATE_INMIGRATE
) &&
1068 !postcopy_ram_supported_by_host(mis
)) {
1069 /* postcopy_ram_supported_by_host will have emitted a more
1072 error_setg(errp
, "Postcopy is not supported");
1076 if (cap_list
[MIGRATION_CAPABILITY_X_IGNORE_SHARED
]) {
1077 error_setg(errp
, "Postcopy is not compatible with ignore-shared");
1085 static void fill_destination_migration_info(MigrationInfo
*info
)
1087 MigrationIncomingState
*mis
= migration_incoming_get_current();
1089 if (mis
->socket_address_list
) {
1090 info
->has_socket_address
= true;
1091 info
->socket_address
=
1092 QAPI_CLONE(SocketAddressList
, mis
->socket_address_list
);
1095 switch (mis
->state
) {
1096 case MIGRATION_STATUS_NONE
:
1099 case MIGRATION_STATUS_SETUP
:
1100 case MIGRATION_STATUS_CANCELLING
:
1101 case MIGRATION_STATUS_CANCELLED
:
1102 case MIGRATION_STATUS_ACTIVE
:
1103 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
1104 case MIGRATION_STATUS_POSTCOPY_PAUSED
:
1105 case MIGRATION_STATUS_POSTCOPY_RECOVER
:
1106 case MIGRATION_STATUS_FAILED
:
1107 case MIGRATION_STATUS_COLO
:
1108 info
->has_status
= true;
1110 case MIGRATION_STATUS_COMPLETED
:
1111 info
->has_status
= true;
1112 fill_destination_postcopy_migration_info(info
);
1115 info
->status
= mis
->state
;
1118 MigrationInfo
*qmp_query_migrate(Error
**errp
)
1120 MigrationInfo
*info
= g_malloc0(sizeof(*info
));
1122 fill_destination_migration_info(info
);
1123 fill_source_migration_info(info
);
1128 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList
*params
,
1131 MigrationState
*s
= migrate_get_current();
1132 MigrationCapabilityStatusList
*cap
;
1133 bool cap_list
[MIGRATION_CAPABILITY__MAX
];
1135 if (migration_is_running(s
->state
)) {
1136 error_setg(errp
, QERR_MIGRATION_ACTIVE
);
1140 memcpy(cap_list
, s
->enabled_capabilities
, sizeof(cap_list
));
1141 if (!migrate_caps_check(cap_list
, params
, errp
)) {
1145 for (cap
= params
; cap
; cap
= cap
->next
) {
1146 s
->enabled_capabilities
[cap
->value
->capability
] = cap
->value
->state
;
1151 * Check whether the parameters are valid. Error will be put into errp
1152 * (if provided). Return true if valid, otherwise false.
1154 static bool migrate_params_check(MigrationParameters
*params
, Error
**errp
)
1156 if (params
->has_compress_level
&&
1157 (params
->compress_level
> 9)) {
1158 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "compress_level",
1159 "is invalid, it should be in the range of 0 to 9");
1163 if (params
->has_compress_threads
&& (params
->compress_threads
< 1)) {
1164 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1166 "is invalid, it should be in the range of 1 to 255");
1170 if (params
->has_decompress_threads
&& (params
->decompress_threads
< 1)) {
1171 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1172 "decompress_threads",
1173 "is invalid, it should be in the range of 1 to 255");
1177 if (params
->has_throttle_trigger_threshold
&&
1178 (params
->throttle_trigger_threshold
< 1 ||
1179 params
->throttle_trigger_threshold
> 100)) {
1180 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1181 "throttle_trigger_threshold",
1182 "an integer in the range of 1 to 100");
1186 if (params
->has_cpu_throttle_initial
&&
1187 (params
->cpu_throttle_initial
< 1 ||
1188 params
->cpu_throttle_initial
> 99)) {
1189 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1190 "cpu_throttle_initial",
1191 "an integer in the range of 1 to 99");
1195 if (params
->has_cpu_throttle_increment
&&
1196 (params
->cpu_throttle_increment
< 1 ||
1197 params
->cpu_throttle_increment
> 99)) {
1198 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1199 "cpu_throttle_increment",
1200 "an integer in the range of 1 to 99");
1204 if (params
->has_max_bandwidth
&& (params
->max_bandwidth
> SIZE_MAX
)) {
1205 error_setg(errp
, "Parameter 'max_bandwidth' expects an integer in the"
1206 " range of 0 to %zu bytes/second", SIZE_MAX
);
1210 if (params
->has_downtime_limit
&&
1211 (params
->downtime_limit
> MAX_MIGRATE_DOWNTIME
)) {
1212 error_setg(errp
, "Parameter 'downtime_limit' expects an integer in "
1213 "the range of 0 to %d milliseconds",
1214 MAX_MIGRATE_DOWNTIME
);
1218 /* x_checkpoint_delay is now always positive */
1220 if (params
->has_multifd_channels
&& (params
->multifd_channels
< 1)) {
1221 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1223 "is invalid, it should be in the range of 1 to 255");
1227 if (params
->has_multifd_zlib_level
&&
1228 (params
->multifd_zlib_level
> 9)) {
1229 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "multifd_zlib_level",
1230 "is invalid, it should be in the range of 0 to 9");
1234 if (params
->has_multifd_zstd_level
&&
1235 (params
->multifd_zstd_level
> 20)) {
1236 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "multifd_zstd_level",
1237 "is invalid, it should be in the range of 0 to 20");
1241 if (params
->has_xbzrle_cache_size
&&
1242 (params
->xbzrle_cache_size
< qemu_target_page_size() ||
1243 !is_power_of_2(params
->xbzrle_cache_size
))) {
1244 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1245 "xbzrle_cache_size",
1246 "is invalid, it should be bigger than target page size"
1247 " and a power of 2");
1251 if (params
->has_max_cpu_throttle
&&
1252 (params
->max_cpu_throttle
< params
->cpu_throttle_initial
||
1253 params
->max_cpu_throttle
> 99)) {
1254 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1256 "an integer in the range of cpu_throttle_initial to 99");
1260 if (params
->has_announce_initial
&&
1261 params
->announce_initial
> 100000) {
1262 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1264 "is invalid, it must be less than 100000 ms");
1267 if (params
->has_announce_max
&&
1268 params
->announce_max
> 100000) {
1269 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1271 "is invalid, it must be less than 100000 ms");
1274 if (params
->has_announce_rounds
&&
1275 params
->announce_rounds
> 1000) {
1276 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1278 "is invalid, it must be in the range of 0 to 1000");
1281 if (params
->has_announce_step
&&
1282 (params
->announce_step
< 1 ||
1283 params
->announce_step
> 10000)) {
1284 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
,
1286 "is invalid, it must be in the range of 1 to 10000 ms");
1292 static void migrate_params_test_apply(MigrateSetParameters
*params
,
1293 MigrationParameters
*dest
)
1295 *dest
= migrate_get_current()->parameters
;
1297 /* TODO use QAPI_CLONE() instead of duplicating it inline */
1299 if (params
->has_compress_level
) {
1300 dest
->compress_level
= params
->compress_level
;
1303 if (params
->has_compress_threads
) {
1304 dest
->compress_threads
= params
->compress_threads
;
1307 if (params
->has_compress_wait_thread
) {
1308 dest
->compress_wait_thread
= params
->compress_wait_thread
;
1311 if (params
->has_decompress_threads
) {
1312 dest
->decompress_threads
= params
->decompress_threads
;
1315 if (params
->has_throttle_trigger_threshold
) {
1316 dest
->throttle_trigger_threshold
= params
->throttle_trigger_threshold
;
1319 if (params
->has_cpu_throttle_initial
) {
1320 dest
->cpu_throttle_initial
= params
->cpu_throttle_initial
;
1323 if (params
->has_cpu_throttle_increment
) {
1324 dest
->cpu_throttle_increment
= params
->cpu_throttle_increment
;
1327 if (params
->has_tls_creds
) {
1328 assert(params
->tls_creds
->type
== QTYPE_QSTRING
);
1329 dest
->tls_creds
= g_strdup(params
->tls_creds
->u
.s
);
1332 if (params
->has_tls_hostname
) {
1333 assert(params
->tls_hostname
->type
== QTYPE_QSTRING
);
1334 dest
->tls_hostname
= g_strdup(params
->tls_hostname
->u
.s
);
1337 if (params
->has_max_bandwidth
) {
1338 dest
->max_bandwidth
= params
->max_bandwidth
;
1341 if (params
->has_downtime_limit
) {
1342 dest
->downtime_limit
= params
->downtime_limit
;
1345 if (params
->has_x_checkpoint_delay
) {
1346 dest
->x_checkpoint_delay
= params
->x_checkpoint_delay
;
1349 if (params
->has_block_incremental
) {
1350 dest
->block_incremental
= params
->block_incremental
;
1352 if (params
->has_multifd_channels
) {
1353 dest
->multifd_channels
= params
->multifd_channels
;
1355 if (params
->has_multifd_compression
) {
1356 dest
->multifd_compression
= params
->multifd_compression
;
1358 if (params
->has_xbzrle_cache_size
) {
1359 dest
->xbzrle_cache_size
= params
->xbzrle_cache_size
;
1361 if (params
->has_max_postcopy_bandwidth
) {
1362 dest
->max_postcopy_bandwidth
= params
->max_postcopy_bandwidth
;
1364 if (params
->has_max_cpu_throttle
) {
1365 dest
->max_cpu_throttle
= params
->max_cpu_throttle
;
1367 if (params
->has_announce_initial
) {
1368 dest
->announce_initial
= params
->announce_initial
;
1370 if (params
->has_announce_max
) {
1371 dest
->announce_max
= params
->announce_max
;
1373 if (params
->has_announce_rounds
) {
1374 dest
->announce_rounds
= params
->announce_rounds
;
1376 if (params
->has_announce_step
) {
1377 dest
->announce_step
= params
->announce_step
;
1381 static void migrate_params_apply(MigrateSetParameters
*params
, Error
**errp
)
1383 MigrationState
*s
= migrate_get_current();
1385 /* TODO use QAPI_CLONE() instead of duplicating it inline */
1387 if (params
->has_compress_level
) {
1388 s
->parameters
.compress_level
= params
->compress_level
;
1391 if (params
->has_compress_threads
) {
1392 s
->parameters
.compress_threads
= params
->compress_threads
;
1395 if (params
->has_compress_wait_thread
) {
1396 s
->parameters
.compress_wait_thread
= params
->compress_wait_thread
;
1399 if (params
->has_decompress_threads
) {
1400 s
->parameters
.decompress_threads
= params
->decompress_threads
;
1403 if (params
->has_throttle_trigger_threshold
) {
1404 s
->parameters
.throttle_trigger_threshold
= params
->throttle_trigger_threshold
;
1407 if (params
->has_cpu_throttle_initial
) {
1408 s
->parameters
.cpu_throttle_initial
= params
->cpu_throttle_initial
;
1411 if (params
->has_cpu_throttle_increment
) {
1412 s
->parameters
.cpu_throttle_increment
= params
->cpu_throttle_increment
;
1415 if (params
->has_tls_creds
) {
1416 g_free(s
->parameters
.tls_creds
);
1417 assert(params
->tls_creds
->type
== QTYPE_QSTRING
);
1418 s
->parameters
.tls_creds
= g_strdup(params
->tls_creds
->u
.s
);
1421 if (params
->has_tls_hostname
) {
1422 g_free(s
->parameters
.tls_hostname
);
1423 assert(params
->tls_hostname
->type
== QTYPE_QSTRING
);
1424 s
->parameters
.tls_hostname
= g_strdup(params
->tls_hostname
->u
.s
);
1427 if (params
->has_tls_authz
) {
1428 g_free(s
->parameters
.tls_authz
);
1429 assert(params
->tls_authz
->type
== QTYPE_QSTRING
);
1430 s
->parameters
.tls_authz
= g_strdup(params
->tls_authz
->u
.s
);
1433 if (params
->has_max_bandwidth
) {
1434 s
->parameters
.max_bandwidth
= params
->max_bandwidth
;
1435 if (s
->to_dst_file
&& !migration_in_postcopy()) {
1436 qemu_file_set_rate_limit(s
->to_dst_file
,
1437 s
->parameters
.max_bandwidth
/ XFER_LIMIT_RATIO
);
1441 if (params
->has_downtime_limit
) {
1442 s
->parameters
.downtime_limit
= params
->downtime_limit
;
1445 if (params
->has_x_checkpoint_delay
) {
1446 s
->parameters
.x_checkpoint_delay
= params
->x_checkpoint_delay
;
1447 if (migration_in_colo_state()) {
1448 colo_checkpoint_notify(s
);
1452 if (params
->has_block_incremental
) {
1453 s
->parameters
.block_incremental
= params
->block_incremental
;
1455 if (params
->has_multifd_channels
) {
1456 s
->parameters
.multifd_channels
= params
->multifd_channels
;
1458 if (params
->has_multifd_compression
) {
1459 s
->parameters
.multifd_compression
= params
->multifd_compression
;
1461 if (params
->has_xbzrle_cache_size
) {
1462 s
->parameters
.xbzrle_cache_size
= params
->xbzrle_cache_size
;
1463 xbzrle_cache_resize(params
->xbzrle_cache_size
, errp
);
1465 if (params
->has_max_postcopy_bandwidth
) {
1466 s
->parameters
.max_postcopy_bandwidth
= params
->max_postcopy_bandwidth
;
1467 if (s
->to_dst_file
&& migration_in_postcopy()) {
1468 qemu_file_set_rate_limit(s
->to_dst_file
,
1469 s
->parameters
.max_postcopy_bandwidth
/ XFER_LIMIT_RATIO
);
1472 if (params
->has_max_cpu_throttle
) {
1473 s
->parameters
.max_cpu_throttle
= params
->max_cpu_throttle
;
1475 if (params
->has_announce_initial
) {
1476 s
->parameters
.announce_initial
= params
->announce_initial
;
1478 if (params
->has_announce_max
) {
1479 s
->parameters
.announce_max
= params
->announce_max
;
1481 if (params
->has_announce_rounds
) {
1482 s
->parameters
.announce_rounds
= params
->announce_rounds
;
1484 if (params
->has_announce_step
) {
1485 s
->parameters
.announce_step
= params
->announce_step
;
1489 void qmp_migrate_set_parameters(MigrateSetParameters
*params
, Error
**errp
)
1491 MigrationParameters tmp
;
1493 /* TODO Rewrite "" to null instead */
1494 if (params
->has_tls_creds
1495 && params
->tls_creds
->type
== QTYPE_QNULL
) {
1496 qobject_unref(params
->tls_creds
->u
.n
);
1497 params
->tls_creds
->type
= QTYPE_QSTRING
;
1498 params
->tls_creds
->u
.s
= strdup("");
1500 /* TODO Rewrite "" to null instead */
1501 if (params
->has_tls_hostname
1502 && params
->tls_hostname
->type
== QTYPE_QNULL
) {
1503 qobject_unref(params
->tls_hostname
->u
.n
);
1504 params
->tls_hostname
->type
= QTYPE_QSTRING
;
1505 params
->tls_hostname
->u
.s
= strdup("");
1508 migrate_params_test_apply(params
, &tmp
);
1510 if (!migrate_params_check(&tmp
, errp
)) {
1511 /* Invalid parameter */
1515 migrate_params_apply(params
, errp
);
1519 void qmp_migrate_start_postcopy(Error
**errp
)
1521 MigrationState
*s
= migrate_get_current();
1523 if (!migrate_postcopy()) {
1524 error_setg(errp
, "Enable postcopy with migrate_set_capability before"
1525 " the start of migration");
1529 if (s
->state
== MIGRATION_STATUS_NONE
) {
1530 error_setg(errp
, "Postcopy must be started after migration has been"
1535 * we don't error if migration has finished since that would be racy
1536 * with issuing this command.
1538 atomic_set(&s
->start_postcopy
, true);
1541 /* shared migration helpers */
1543 void migrate_set_state(int *state
, int old_state
, int new_state
)
1545 assert(new_state
< MIGRATION_STATUS__MAX
);
1546 if (atomic_cmpxchg(state
, old_state
, new_state
) == old_state
) {
1547 trace_migrate_set_state(MigrationStatus_str(new_state
));
1548 migrate_generate_event(new_state
);
1552 static MigrationCapabilityStatusList
*migrate_cap_add(
1553 MigrationCapabilityStatusList
*list
,
1554 MigrationCapability index
,
1557 MigrationCapabilityStatusList
*cap
;
1559 cap
= g_new0(MigrationCapabilityStatusList
, 1);
1560 cap
->value
= g_new0(MigrationCapabilityStatus
, 1);
1561 cap
->value
->capability
= index
;
1562 cap
->value
->state
= state
;
1568 void migrate_set_block_enabled(bool value
, Error
**errp
)
1570 MigrationCapabilityStatusList
*cap
;
1572 cap
= migrate_cap_add(NULL
, MIGRATION_CAPABILITY_BLOCK
, value
);
1573 qmp_migrate_set_capabilities(cap
, errp
);
1574 qapi_free_MigrationCapabilityStatusList(cap
);
1577 static void migrate_set_block_incremental(MigrationState
*s
, bool value
)
1579 s
->parameters
.block_incremental
= value
;
1582 static void block_cleanup_parameters(MigrationState
*s
)
1584 if (s
->must_remove_block_options
) {
1585 /* setting to false can never fail */
1586 migrate_set_block_enabled(false, &error_abort
);
1587 migrate_set_block_incremental(s
, false);
1588 s
->must_remove_block_options
= false;
1592 static void migrate_fd_cleanup(MigrationState
*s
)
1594 qemu_bh_delete(s
->cleanup_bh
);
1595 s
->cleanup_bh
= NULL
;
1597 qemu_savevm_state_cleanup();
1599 if (s
->to_dst_file
) {
1602 trace_migrate_fd_cleanup();
1603 qemu_mutex_unlock_iothread();
1604 if (s
->migration_thread_running
) {
1605 qemu_thread_join(&s
->thread
);
1606 s
->migration_thread_running
= false;
1608 qemu_mutex_lock_iothread();
1610 multifd_save_cleanup();
1611 qemu_mutex_lock(&s
->qemu_file_lock
);
1612 tmp
= s
->to_dst_file
;
1613 s
->to_dst_file
= NULL
;
1614 qemu_mutex_unlock(&s
->qemu_file_lock
);
1616 * Close the file handle without the lock to make sure the
1617 * critical section won't block for long.
1622 assert(!migration_is_active(s
));
1624 if (s
->state
== MIGRATION_STATUS_CANCELLING
) {
1625 migrate_set_state(&s
->state
, MIGRATION_STATUS_CANCELLING
,
1626 MIGRATION_STATUS_CANCELLED
);
1630 /* It is used on info migrate. We can't free it */
1631 error_report_err(error_copy(s
->error
));
1633 notifier_list_notify(&migration_state_notifiers
, s
);
1634 block_cleanup_parameters(s
);
1637 static void migrate_fd_cleanup_schedule(MigrationState
*s
)
1640 * Ref the state for bh, because it may be called when
1641 * there're already no other refs
1643 object_ref(OBJECT(s
));
1644 qemu_bh_schedule(s
->cleanup_bh
);
1647 static void migrate_fd_cleanup_bh(void *opaque
)
1649 MigrationState
*s
= opaque
;
1650 migrate_fd_cleanup(s
);
1651 object_unref(OBJECT(s
));
1654 void migrate_set_error(MigrationState
*s
, const Error
*error
)
1656 qemu_mutex_lock(&s
->error_mutex
);
1658 s
->error
= error_copy(error
);
1660 qemu_mutex_unlock(&s
->error_mutex
);
1663 void migrate_fd_error(MigrationState
*s
, const Error
*error
)
1665 trace_migrate_fd_error(error_get_pretty(error
));
1666 assert(s
->to_dst_file
== NULL
);
1667 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
1668 MIGRATION_STATUS_FAILED
);
1669 migrate_set_error(s
, error
);
1672 static void migrate_fd_cancel(MigrationState
*s
)
1675 QEMUFile
*f
= migrate_get_current()->to_dst_file
;
1676 trace_migrate_fd_cancel();
1678 if (s
->rp_state
.from_dst_file
) {
1679 /* shutdown the rp socket, so causing the rp thread to shutdown */
1680 qemu_file_shutdown(s
->rp_state
.from_dst_file
);
1684 old_state
= s
->state
;
1685 if (!migration_is_running(old_state
)) {
1688 /* If the migration is paused, kick it out of the pause */
1689 if (old_state
== MIGRATION_STATUS_PRE_SWITCHOVER
) {
1690 qemu_sem_post(&s
->pause_sem
);
1692 migrate_set_state(&s
->state
, old_state
, MIGRATION_STATUS_CANCELLING
);
1693 } while (s
->state
!= MIGRATION_STATUS_CANCELLING
);
1696 * If we're unlucky the migration code might be stuck somewhere in a
1697 * send/write while the network has failed and is waiting to timeout;
1698 * if we've got shutdown(2) available then we can force it to quit.
1699 * The outgoing qemu file gets closed in migrate_fd_cleanup that is
1700 * called in a bh, so there is no race against this cancel.
1702 if (s
->state
== MIGRATION_STATUS_CANCELLING
&& f
) {
1703 qemu_file_shutdown(f
);
1705 if (s
->state
== MIGRATION_STATUS_CANCELLING
&& s
->block_inactive
) {
1706 Error
*local_err
= NULL
;
1708 bdrv_invalidate_cache_all(&local_err
);
1710 error_report_err(local_err
);
1712 s
->block_inactive
= false;
1717 void add_migration_state_change_notifier(Notifier
*notify
)
1719 notifier_list_add(&migration_state_notifiers
, notify
);
1722 void remove_migration_state_change_notifier(Notifier
*notify
)
1724 notifier_remove(notify
);
1727 bool migration_in_setup(MigrationState
*s
)
1729 return s
->state
== MIGRATION_STATUS_SETUP
;
1732 bool migration_has_finished(MigrationState
*s
)
1734 return s
->state
== MIGRATION_STATUS_COMPLETED
;
1737 bool migration_has_failed(MigrationState
*s
)
1739 return (s
->state
== MIGRATION_STATUS_CANCELLED
||
1740 s
->state
== MIGRATION_STATUS_FAILED
);
1743 bool migration_in_postcopy(void)
1745 MigrationState
*s
= migrate_get_current();
1748 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
1749 case MIGRATION_STATUS_POSTCOPY_PAUSED
:
1750 case MIGRATION_STATUS_POSTCOPY_RECOVER
:
1757 bool migration_in_postcopy_after_devices(MigrationState
*s
)
1759 return migration_in_postcopy() && s
->postcopy_after_devices
;
1762 bool migration_is_idle(void)
1764 MigrationState
*s
= current_migration
;
1771 case MIGRATION_STATUS_NONE
:
1772 case MIGRATION_STATUS_CANCELLED
:
1773 case MIGRATION_STATUS_COMPLETED
:
1774 case MIGRATION_STATUS_FAILED
:
1776 case MIGRATION_STATUS_SETUP
:
1777 case MIGRATION_STATUS_CANCELLING
:
1778 case MIGRATION_STATUS_ACTIVE
:
1779 case MIGRATION_STATUS_POSTCOPY_ACTIVE
:
1780 case MIGRATION_STATUS_COLO
:
1781 case MIGRATION_STATUS_PRE_SWITCHOVER
:
1782 case MIGRATION_STATUS_DEVICE
:
1783 case MIGRATION_STATUS_WAIT_UNPLUG
:
1785 case MIGRATION_STATUS__MAX
:
1786 g_assert_not_reached();
1792 bool migration_is_active(MigrationState
*s
)
1794 return (s
->state
== MIGRATION_STATUS_ACTIVE
||
1795 s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
);
1798 void migrate_init(MigrationState
*s
)
1801 * Reinitialise all migration state, except
1802 * parameters/capabilities that the user set, and
1806 s
->to_dst_file
= NULL
;
1807 s
->state
= MIGRATION_STATUS_NONE
;
1808 s
->rp_state
.from_dst_file
= NULL
;
1809 s
->rp_state
.error
= false;
1811 s
->pages_per_second
= 0.0;
1813 s
->expected_downtime
= 0;
1815 s
->start_postcopy
= false;
1816 s
->postcopy_after_devices
= false;
1817 s
->migration_thread_running
= false;
1818 error_free(s
->error
);
1821 migrate_set_state(&s
->state
, MIGRATION_STATUS_NONE
, MIGRATION_STATUS_SETUP
);
1823 s
->start_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
1825 s
->vm_was_running
= false;
1826 s
->iteration_initial_bytes
= 0;
1827 s
->threshold_size
= 0;
1830 static GSList
*migration_blockers
;
1832 int migrate_add_blocker(Error
*reason
, Error
**errp
)
1834 if (only_migratable
) {
1835 error_propagate_prepend(errp
, error_copy(reason
),
1836 "disallowing migration blocker "
1837 "(--only-migratable) for: ");
1841 if (migration_is_idle()) {
1842 migration_blockers
= g_slist_prepend(migration_blockers
, reason
);
1846 error_propagate_prepend(errp
, error_copy(reason
),
1847 "disallowing migration blocker "
1848 "(migration in progress) for: ");
1852 void migrate_del_blocker(Error
*reason
)
1854 migration_blockers
= g_slist_remove(migration_blockers
, reason
);
1857 void qmp_migrate_incoming(const char *uri
, Error
**errp
)
1859 Error
*local_err
= NULL
;
1860 static bool once
= true;
1862 if (!deferred_incoming
) {
1863 error_setg(errp
, "For use with '-incoming defer'");
1867 error_setg(errp
, "The incoming migration has already been started");
1871 qemu_start_incoming_migration(uri
, &local_err
);
1874 error_propagate(errp
, local_err
);
1881 void qmp_migrate_recover(const char *uri
, Error
**errp
)
1883 MigrationIncomingState
*mis
= migration_incoming_get_current();
1885 if (mis
->state
!= MIGRATION_STATUS_POSTCOPY_PAUSED
) {
1886 error_setg(errp
, "Migrate recover can only be run "
1887 "when postcopy is paused.");
1891 if (atomic_cmpxchg(&mis
->postcopy_recover_triggered
,
1892 false, true) == true) {
1893 error_setg(errp
, "Migrate recovery is triggered already");
1898 * Note that this call will never start a real migration; it will
1899 * only re-setup the migration stream and poke existing migration
1900 * to continue using that newly established channel.
1902 qemu_start_incoming_migration(uri
, errp
);
1905 void qmp_migrate_pause(Error
**errp
)
1907 MigrationState
*ms
= migrate_get_current();
1908 MigrationIncomingState
*mis
= migration_incoming_get_current();
1911 if (ms
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
) {
1912 /* Source side, during postcopy */
1913 qemu_mutex_lock(&ms
->qemu_file_lock
);
1914 ret
= qemu_file_shutdown(ms
->to_dst_file
);
1915 qemu_mutex_unlock(&ms
->qemu_file_lock
);
1917 error_setg(errp
, "Failed to pause source migration");
1922 if (mis
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
) {
1923 ret
= qemu_file_shutdown(mis
->from_src_file
);
1925 error_setg(errp
, "Failed to pause destination migration");
1930 error_setg(errp
, "migrate-pause is currently only supported "
1931 "during postcopy-active state");
1934 bool migration_is_blocked(Error
**errp
)
1936 if (qemu_savevm_state_blocked(errp
)) {
1940 if (migration_blockers
) {
1941 error_propagate(errp
, error_copy(migration_blockers
->data
));
1948 /* Returns true if continue to migrate, or false if error detected */
1949 static bool migrate_prepare(MigrationState
*s
, bool blk
, bool blk_inc
,
1950 bool resume
, Error
**errp
)
1952 Error
*local_err
= NULL
;
1955 if (s
->state
!= MIGRATION_STATUS_POSTCOPY_PAUSED
) {
1956 error_setg(errp
, "Cannot resume if there is no "
1957 "paused migration");
1962 * Postcopy recovery won't work well with release-ram
1963 * capability since release-ram will drop the page buffer as
1964 * long as the page is put into the send buffer. So if there
1965 * is a network failure happened, any page buffers that have
1966 * not yet reached the destination VM but have already been
1967 * sent from the source VM will be lost forever. Let's refuse
1968 * the client from resuming such a postcopy migration.
1969 * Luckily release-ram was designed to only be used when src
1970 * and destination VMs are on the same host, so it should be
1973 if (migrate_release_ram()) {
1974 error_setg(errp
, "Postcopy recovery cannot work "
1975 "when release-ram capability is set");
1979 /* This is a resume, skip init status */
1983 if (migration_is_running(s
->state
)) {
1984 error_setg(errp
, QERR_MIGRATION_ACTIVE
);
1988 if (runstate_check(RUN_STATE_INMIGRATE
)) {
1989 error_setg(errp
, "Guest is waiting for an incoming migration");
1993 if (migration_is_blocked(errp
)) {
1997 if (blk
|| blk_inc
) {
1998 if (migrate_use_block() || migrate_use_block_incremental()) {
1999 error_setg(errp
, "Command options are incompatible with "
2000 "current migration capabilities");
2003 migrate_set_block_enabled(true, &local_err
);
2005 error_propagate(errp
, local_err
);
2008 s
->must_remove_block_options
= true;
2012 migrate_set_block_incremental(s
, true);
2017 * set ram_counters memory to zero for a
2020 memset(&ram_counters
, 0, sizeof(ram_counters
));
2025 void qmp_migrate(const char *uri
, bool has_blk
, bool blk
,
2026 bool has_inc
, bool inc
, bool has_detach
, bool detach
,
2027 bool has_resume
, bool resume
, Error
**errp
)
2029 Error
*local_err
= NULL
;
2030 MigrationState
*s
= migrate_get_current();
2033 if (!migrate_prepare(s
, has_blk
&& blk
, has_inc
&& inc
,
2034 has_resume
&& resume
, errp
)) {
2035 /* Error detected, put into errp */
2039 if (strstart(uri
, "tcp:", &p
)) {
2040 tcp_start_outgoing_migration(s
, p
, &local_err
);
2042 } else if (strstart(uri
, "rdma:", &p
)) {
2043 rdma_start_outgoing_migration(s
, p
, &local_err
);
2045 } else if (strstart(uri
, "exec:", &p
)) {
2046 exec_start_outgoing_migration(s
, p
, &local_err
);
2047 } else if (strstart(uri
, "unix:", &p
)) {
2048 unix_start_outgoing_migration(s
, p
, &local_err
);
2049 } else if (strstart(uri
, "fd:", &p
)) {
2050 fd_start_outgoing_migration(s
, p
, &local_err
);
2052 error_setg(errp
, QERR_INVALID_PARAMETER_VALUE
, "uri",
2053 "a valid migration protocol");
2054 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
2055 MIGRATION_STATUS_FAILED
);
2056 block_cleanup_parameters(s
);
2061 migrate_fd_error(s
, local_err
);
2062 error_propagate(errp
, local_err
);
2067 void qmp_migrate_cancel(Error
**errp
)
2069 migrate_fd_cancel(migrate_get_current());
2072 void qmp_migrate_continue(MigrationStatus state
, Error
**errp
)
2074 MigrationState
*s
= migrate_get_current();
2075 if (s
->state
!= state
) {
2076 error_setg(errp
, "Migration not in expected state: %s",
2077 MigrationStatus_str(s
->state
));
2080 qemu_sem_post(&s
->pause_sem
);
2083 void qmp_migrate_set_cache_size(int64_t value
, Error
**errp
)
2085 MigrateSetParameters p
= {
2086 .has_xbzrle_cache_size
= true,
2087 .xbzrle_cache_size
= value
,
2090 qmp_migrate_set_parameters(&p
, errp
);
2093 int64_t qmp_query_migrate_cache_size(Error
**errp
)
2095 return migrate_xbzrle_cache_size();
2098 void qmp_migrate_set_speed(int64_t value
, Error
**errp
)
2100 MigrateSetParameters p
= {
2101 .has_max_bandwidth
= true,
2102 .max_bandwidth
= value
,
2105 qmp_migrate_set_parameters(&p
, errp
);
2108 void qmp_migrate_set_downtime(double value
, Error
**errp
)
2110 if (value
< 0 || value
> MAX_MIGRATE_DOWNTIME_SECONDS
) {
2111 error_setg(errp
, "Parameter 'downtime_limit' expects an integer in "
2112 "the range of 0 to %d seconds",
2113 MAX_MIGRATE_DOWNTIME_SECONDS
);
2117 value
*= 1000; /* Convert to milliseconds */
2119 MigrateSetParameters p
= {
2120 .has_downtime_limit
= true,
2121 .downtime_limit
= (int64_t)value
,
2124 qmp_migrate_set_parameters(&p
, errp
);
2127 bool migrate_release_ram(void)
2131 s
= migrate_get_current();
2133 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_RELEASE_RAM
];
2136 bool migrate_postcopy_ram(void)
2140 s
= migrate_get_current();
2142 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_POSTCOPY_RAM
];
2145 bool migrate_postcopy(void)
2147 return migrate_postcopy_ram() || migrate_dirty_bitmaps();
2150 bool migrate_auto_converge(void)
2154 s
= migrate_get_current();
2156 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_AUTO_CONVERGE
];
2159 bool migrate_zero_blocks(void)
2163 s
= migrate_get_current();
2165 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_ZERO_BLOCKS
];
2168 bool migrate_postcopy_blocktime(void)
2172 s
= migrate_get_current();
2174 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME
];
2177 bool migrate_use_compression(void)
2181 s
= migrate_get_current();
2183 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_COMPRESS
];
2186 int migrate_compress_level(void)
2190 s
= migrate_get_current();
2192 return s
->parameters
.compress_level
;
2195 int migrate_compress_threads(void)
2199 s
= migrate_get_current();
2201 return s
->parameters
.compress_threads
;
2204 int migrate_compress_wait_thread(void)
2208 s
= migrate_get_current();
2210 return s
->parameters
.compress_wait_thread
;
2213 int migrate_decompress_threads(void)
2217 s
= migrate_get_current();
2219 return s
->parameters
.decompress_threads
;
2222 bool migrate_dirty_bitmaps(void)
2226 s
= migrate_get_current();
2228 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_DIRTY_BITMAPS
];
2231 bool migrate_ignore_shared(void)
2235 s
= migrate_get_current();
2237 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_X_IGNORE_SHARED
];
2240 bool migrate_validate_uuid(void)
2244 s
= migrate_get_current();
2246 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_VALIDATE_UUID
];
2249 bool migrate_use_events(void)
2253 s
= migrate_get_current();
2255 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_EVENTS
];
2258 bool migrate_use_multifd(void)
2262 s
= migrate_get_current();
2264 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_MULTIFD
];
2267 bool migrate_pause_before_switchover(void)
2271 s
= migrate_get_current();
2273 return s
->enabled_capabilities
[
2274 MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER
];
2277 int migrate_multifd_channels(void)
2281 s
= migrate_get_current();
2283 return s
->parameters
.multifd_channels
;
2286 MultiFDCompression
migrate_multifd_compression(void)
2290 s
= migrate_get_current();
2292 return s
->parameters
.multifd_compression
;
2295 int migrate_multifd_zlib_level(void)
2299 s
= migrate_get_current();
2301 return s
->parameters
.multifd_zlib_level
;
2304 int migrate_multifd_zstd_level(void)
2308 s
= migrate_get_current();
2310 return s
->parameters
.multifd_zstd_level
;
2313 int migrate_use_xbzrle(void)
2317 s
= migrate_get_current();
2319 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_XBZRLE
];
2322 int64_t migrate_xbzrle_cache_size(void)
2326 s
= migrate_get_current();
2328 return s
->parameters
.xbzrle_cache_size
;
2331 static int64_t migrate_max_postcopy_bandwidth(void)
2335 s
= migrate_get_current();
2337 return s
->parameters
.max_postcopy_bandwidth
;
2340 bool migrate_use_block(void)
2344 s
= migrate_get_current();
2346 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_BLOCK
];
2349 bool migrate_use_return_path(void)
2353 s
= migrate_get_current();
2355 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_RETURN_PATH
];
2358 bool migrate_use_block_incremental(void)
2362 s
= migrate_get_current();
2364 return s
->parameters
.block_incremental
;
2367 /* migration thread support */
2369 * Something bad happened to the RP stream, mark an error
2370 * The caller shall print or trace something to indicate why
2372 static void mark_source_rp_bad(MigrationState
*s
)
2374 s
->rp_state
.error
= true;
2377 static struct rp_cmd_args
{
2378 ssize_t len
; /* -1 = variable */
2381 [MIG_RP_MSG_INVALID
] = { .len
= -1, .name
= "INVALID" },
2382 [MIG_RP_MSG_SHUT
] = { .len
= 4, .name
= "SHUT" },
2383 [MIG_RP_MSG_PONG
] = { .len
= 4, .name
= "PONG" },
2384 [MIG_RP_MSG_REQ_PAGES
] = { .len
= 12, .name
= "REQ_PAGES" },
2385 [MIG_RP_MSG_REQ_PAGES_ID
] = { .len
= -1, .name
= "REQ_PAGES_ID" },
2386 [MIG_RP_MSG_RECV_BITMAP
] = { .len
= -1, .name
= "RECV_BITMAP" },
2387 [MIG_RP_MSG_RESUME_ACK
] = { .len
= 4, .name
= "RESUME_ACK" },
2388 [MIG_RP_MSG_MAX
] = { .len
= -1, .name
= "MAX" },
2392 * Process a request for pages received on the return path,
2393 * We're allowed to send more than requested (e.g. to round to our page size)
2394 * and we don't need to send pages that have already been sent.
2396 static void migrate_handle_rp_req_pages(MigrationState
*ms
, const char* rbname
,
2397 ram_addr_t start
, size_t len
)
2399 long our_host_ps
= qemu_real_host_page_size
;
2401 trace_migrate_handle_rp_req_pages(rbname
, start
, len
);
2404 * Since we currently insist on matching page sizes, just sanity check
2405 * we're being asked for whole host pages.
2407 if (start
& (our_host_ps
-1) ||
2408 (len
& (our_host_ps
-1))) {
2409 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
2410 " len: %zd", __func__
, start
, len
);
2411 mark_source_rp_bad(ms
);
2415 if (ram_save_queue_pages(rbname
, start
, len
)) {
2416 mark_source_rp_bad(ms
);
2420 /* Return true to retry, false to quit */
2421 static bool postcopy_pause_return_path_thread(MigrationState
*s
)
2423 trace_postcopy_pause_return_path();
2425 qemu_sem_wait(&s
->postcopy_pause_rp_sem
);
2427 trace_postcopy_pause_return_path_continued();
2432 static int migrate_handle_rp_recv_bitmap(MigrationState
*s
, char *block_name
)
2434 RAMBlock
*block
= qemu_ram_block_by_name(block_name
);
2437 error_report("%s: invalid block name '%s'", __func__
, block_name
);
2441 /* Fetch the received bitmap and refresh the dirty bitmap */
2442 return ram_dirty_bitmap_reload(s
, block
);
2445 static int migrate_handle_rp_resume_ack(MigrationState
*s
, uint32_t value
)
2447 trace_source_return_path_thread_resume_ack(value
);
2449 if (value
!= MIGRATION_RESUME_ACK_VALUE
) {
2450 error_report("%s: illegal resume_ack value %"PRIu32
,
2455 /* Now both sides are active. */
2456 migrate_set_state(&s
->state
, MIGRATION_STATUS_POSTCOPY_RECOVER
,
2457 MIGRATION_STATUS_POSTCOPY_ACTIVE
);
2459 /* Notify send thread that time to continue send pages */
2460 qemu_sem_post(&s
->rp_state
.rp_sem
);
2466 * Handles messages sent on the return path towards the source VM
2469 static void *source_return_path_thread(void *opaque
)
2471 MigrationState
*ms
= opaque
;
2472 QEMUFile
*rp
= ms
->rp_state
.from_dst_file
;
2473 uint16_t header_len
, header_type
;
2475 uint32_t tmp32
, sibling_error
;
2476 ram_addr_t start
= 0; /* =0 to silence warning */
2477 size_t len
= 0, expected_len
;
2480 trace_source_return_path_thread_entry();
2481 rcu_register_thread();
2484 while (!ms
->rp_state
.error
&& !qemu_file_get_error(rp
) &&
2485 migration_is_setup_or_active(ms
->state
)) {
2486 trace_source_return_path_thread_loop_top();
2487 header_type
= qemu_get_be16(rp
);
2488 header_len
= qemu_get_be16(rp
);
2490 if (qemu_file_get_error(rp
)) {
2491 mark_source_rp_bad(ms
);
2495 if (header_type
>= MIG_RP_MSG_MAX
||
2496 header_type
== MIG_RP_MSG_INVALID
) {
2497 error_report("RP: Received invalid message 0x%04x length 0x%04x",
2498 header_type
, header_len
);
2499 mark_source_rp_bad(ms
);
2503 if ((rp_cmd_args
[header_type
].len
!= -1 &&
2504 header_len
!= rp_cmd_args
[header_type
].len
) ||
2505 header_len
> sizeof(buf
)) {
2506 error_report("RP: Received '%s' message (0x%04x) with"
2507 "incorrect length %d expecting %zu",
2508 rp_cmd_args
[header_type
].name
, header_type
, header_len
,
2509 (size_t)rp_cmd_args
[header_type
].len
);
2510 mark_source_rp_bad(ms
);
2514 /* We know we've got a valid header by this point */
2515 res
= qemu_get_buffer(rp
, buf
, header_len
);
2516 if (res
!= header_len
) {
2517 error_report("RP: Failed reading data for message 0x%04x"
2518 " read %d expected %d",
2519 header_type
, res
, header_len
);
2520 mark_source_rp_bad(ms
);
2524 /* OK, we have the message and the data */
2525 switch (header_type
) {
2526 case MIG_RP_MSG_SHUT
:
2527 sibling_error
= ldl_be_p(buf
);
2528 trace_source_return_path_thread_shut(sibling_error
);
2529 if (sibling_error
) {
2530 error_report("RP: Sibling indicated error %d", sibling_error
);
2531 mark_source_rp_bad(ms
);
2534 * We'll let the main thread deal with closing the RP
2535 * we could do a shutdown(2) on it, but we're the only user
2536 * anyway, so there's nothing gained.
2540 case MIG_RP_MSG_PONG
:
2541 tmp32
= ldl_be_p(buf
);
2542 trace_source_return_path_thread_pong(tmp32
);
2545 case MIG_RP_MSG_REQ_PAGES
:
2546 start
= ldq_be_p(buf
);
2547 len
= ldl_be_p(buf
+ 8);
2548 migrate_handle_rp_req_pages(ms
, NULL
, start
, len
);
2551 case MIG_RP_MSG_REQ_PAGES_ID
:
2552 expected_len
= 12 + 1; /* header + termination */
2554 if (header_len
>= expected_len
) {
2555 start
= ldq_be_p(buf
);
2556 len
= ldl_be_p(buf
+ 8);
2557 /* Now we expect an idstr */
2558 tmp32
= buf
[12]; /* Length of the following idstr */
2559 buf
[13 + tmp32
] = '\0';
2560 expected_len
+= tmp32
;
2562 if (header_len
!= expected_len
) {
2563 error_report("RP: Req_Page_id with length %d expecting %zd",
2564 header_len
, expected_len
);
2565 mark_source_rp_bad(ms
);
2568 migrate_handle_rp_req_pages(ms
, (char *)&buf
[13], start
, len
);
2571 case MIG_RP_MSG_RECV_BITMAP
:
2572 if (header_len
< 1) {
2573 error_report("%s: missing block name", __func__
);
2574 mark_source_rp_bad(ms
);
2577 /* Format: len (1B) + idstr (<255B). This ends the idstr. */
2578 buf
[buf
[0] + 1] = '\0';
2579 if (migrate_handle_rp_recv_bitmap(ms
, (char *)(buf
+ 1))) {
2580 mark_source_rp_bad(ms
);
2585 case MIG_RP_MSG_RESUME_ACK
:
2586 tmp32
= ldl_be_p(buf
);
2587 if (migrate_handle_rp_resume_ack(ms
, tmp32
)) {
2588 mark_source_rp_bad(ms
);
2599 res
= qemu_file_get_error(rp
);
2601 if (res
== -EIO
&& migration_in_postcopy()) {
2603 * Maybe there is something we can do: it looks like a
2604 * network down issue, and we pause for a recovery.
2606 if (postcopy_pause_return_path_thread(ms
)) {
2607 /* Reload rp, reset the rest */
2608 if (rp
!= ms
->rp_state
.from_dst_file
) {
2610 rp
= ms
->rp_state
.from_dst_file
;
2612 ms
->rp_state
.error
= false;
2617 trace_source_return_path_thread_bad_end();
2618 mark_source_rp_bad(ms
);
2621 trace_source_return_path_thread_end();
2622 ms
->rp_state
.from_dst_file
= NULL
;
2624 rcu_unregister_thread();
2628 static int open_return_path_on_source(MigrationState
*ms
,
2632 ms
->rp_state
.from_dst_file
= qemu_file_get_return_path(ms
->to_dst_file
);
2633 if (!ms
->rp_state
.from_dst_file
) {
2637 trace_open_return_path_on_source();
2639 if (!create_thread
) {
2644 qemu_thread_create(&ms
->rp_state
.rp_thread
, "return path",
2645 source_return_path_thread
, ms
, QEMU_THREAD_JOINABLE
);
2647 trace_open_return_path_on_source_continue();
2652 /* Returns 0 if the RP was ok, otherwise there was an error on the RP */
2653 static int await_return_path_close_on_source(MigrationState
*ms
)
2656 * If this is a normal exit then the destination will send a SHUT and the
2657 * rp_thread will exit, however if there's an error we need to cause
2660 if (qemu_file_get_error(ms
->to_dst_file
) && ms
->rp_state
.from_dst_file
) {
2662 * shutdown(2), if we have it, will cause it to unblock if it's stuck
2663 * waiting for the destination.
2665 qemu_file_shutdown(ms
->rp_state
.from_dst_file
);
2666 mark_source_rp_bad(ms
);
2668 trace_await_return_path_close_on_source_joining();
2669 qemu_thread_join(&ms
->rp_state
.rp_thread
);
2670 trace_await_return_path_close_on_source_close();
2671 return ms
->rp_state
.error
;
2675 * Switch from normal iteration to postcopy
2676 * Returns non-0 on error
2678 static int postcopy_start(MigrationState
*ms
)
2681 QIOChannelBuffer
*bioc
;
2683 int64_t time_at_stop
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2684 int64_t bandwidth
= migrate_max_postcopy_bandwidth();
2685 bool restart_block
= false;
2686 int cur_state
= MIGRATION_STATUS_ACTIVE
;
2687 if (!migrate_pause_before_switchover()) {
2688 migrate_set_state(&ms
->state
, MIGRATION_STATUS_ACTIVE
,
2689 MIGRATION_STATUS_POSTCOPY_ACTIVE
);
2692 trace_postcopy_start();
2693 qemu_mutex_lock_iothread();
2694 trace_postcopy_start_set_run();
2696 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER
, NULL
);
2697 global_state_store();
2698 ret
= vm_stop_force_state(RUN_STATE_FINISH_MIGRATE
);
2703 ret
= migration_maybe_pause(ms
, &cur_state
,
2704 MIGRATION_STATUS_POSTCOPY_ACTIVE
);
2709 ret
= bdrv_inactivate_all();
2713 restart_block
= true;
2716 * Cause any non-postcopiable, but iterative devices to
2717 * send out their final data.
2719 qemu_savevm_state_complete_precopy(ms
->to_dst_file
, true, false);
2722 * in Finish migrate and with the io-lock held everything should
2723 * be quiet, but we've potentially still got dirty pages and we
2724 * need to tell the destination to throw any pages it's already received
2727 if (migrate_postcopy_ram()) {
2728 if (ram_postcopy_send_discard_bitmap(ms
)) {
2729 error_report("postcopy send discard bitmap failed");
2735 * send rest of state - note things that are doing postcopy
2736 * will notice we're in POSTCOPY_ACTIVE and not actually
2737 * wrap their state up here
2739 /* 0 max-postcopy-bandwidth means unlimited */
2741 qemu_file_set_rate_limit(ms
->to_dst_file
, INT64_MAX
);
2743 qemu_file_set_rate_limit(ms
->to_dst_file
, bandwidth
/ XFER_LIMIT_RATIO
);
2745 if (migrate_postcopy_ram()) {
2746 /* Ping just for debugging, helps line traces up */
2747 qemu_savevm_send_ping(ms
->to_dst_file
, 2);
2751 * While loading the device state we may trigger page transfer
2752 * requests and the fd must be free to process those, and thus
2753 * the destination must read the whole device state off the fd before
2754 * it starts processing it. Unfortunately the ad-hoc migration format
2755 * doesn't allow the destination to know the size to read without fully
2756 * parsing it through each devices load-state code (especially the open
2757 * coded devices that use get/put).
2758 * So we wrap the device state up in a package with a length at the start;
2759 * to do this we use a qemu_buf to hold the whole of the device state.
2761 bioc
= qio_channel_buffer_new(4096);
2762 qio_channel_set_name(QIO_CHANNEL(bioc
), "migration-postcopy-buffer");
2763 fb
= qemu_fopen_channel_output(QIO_CHANNEL(bioc
));
2764 object_unref(OBJECT(bioc
));
2767 * Make sure the receiver can get incoming pages before we send the rest
2770 qemu_savevm_send_postcopy_listen(fb
);
2772 qemu_savevm_state_complete_precopy(fb
, false, false);
2773 if (migrate_postcopy_ram()) {
2774 qemu_savevm_send_ping(fb
, 3);
2777 qemu_savevm_send_postcopy_run(fb
);
2779 /* <><> end of stuff going into the package */
2781 /* Last point of recovery; as soon as we send the package the destination
2782 * can open devices and potentially start running.
2783 * Lets just check again we've not got any errors.
2785 ret
= qemu_file_get_error(ms
->to_dst_file
);
2787 error_report("postcopy_start: Migration stream errored (pre package)");
2791 restart_block
= false;
2793 /* Now send that blob */
2794 if (qemu_savevm_send_packaged(ms
->to_dst_file
, bioc
->data
, bioc
->usage
)) {
2799 /* Send a notify to give a chance for anything that needs to happen
2800 * at the transition to postcopy and after the device state; in particular
2801 * spice needs to trigger a transition now
2803 ms
->postcopy_after_devices
= true;
2804 notifier_list_notify(&migration_state_notifiers
, ms
);
2806 ms
->downtime
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
) - time_at_stop
;
2808 qemu_mutex_unlock_iothread();
2810 if (migrate_postcopy_ram()) {
2812 * Although this ping is just for debug, it could potentially be
2813 * used for getting a better measurement of downtime at the source.
2815 qemu_savevm_send_ping(ms
->to_dst_file
, 4);
2818 if (migrate_release_ram()) {
2819 ram_postcopy_migrated_memory_release(ms
);
2822 ret
= qemu_file_get_error(ms
->to_dst_file
);
2824 error_report("postcopy_start: Migration stream errored");
2825 migrate_set_state(&ms
->state
, MIGRATION_STATUS_POSTCOPY_ACTIVE
,
2826 MIGRATION_STATUS_FAILED
);
2834 migrate_set_state(&ms
->state
, MIGRATION_STATUS_POSTCOPY_ACTIVE
,
2835 MIGRATION_STATUS_FAILED
);
2836 if (restart_block
) {
2837 /* A failure happened early enough that we know the destination hasn't
2838 * accessed block devices, so we're safe to recover.
2840 Error
*local_err
= NULL
;
2842 bdrv_invalidate_cache_all(&local_err
);
2844 error_report_err(local_err
);
2847 qemu_mutex_unlock_iothread();
2852 * migration_maybe_pause: Pause if required to by
2853 * migrate_pause_before_switchover called with the iothread locked
2854 * Returns: 0 on success
2856 static int migration_maybe_pause(MigrationState
*s
,
2857 int *current_active_state
,
2860 if (!migrate_pause_before_switchover()) {
2864 /* Since leaving this state is not atomic with posting the semaphore
2865 * it's possible that someone could have issued multiple migrate_continue
2866 * and the semaphore is incorrectly positive at this point;
2867 * the docs say it's undefined to reinit a semaphore that's already
2868 * init'd, so use timedwait to eat up any existing posts.
2870 while (qemu_sem_timedwait(&s
->pause_sem
, 1) == 0) {
2871 /* This block intentionally left blank */
2875 * If the migration is cancelled when it is in the completion phase,
2876 * the migration state is set to MIGRATION_STATUS_CANCELLING.
2877 * So we don't need to wait a semaphore, otherwise we would always
2878 * wait for the 'pause_sem' semaphore.
2880 if (s
->state
!= MIGRATION_STATUS_CANCELLING
) {
2881 qemu_mutex_unlock_iothread();
2882 migrate_set_state(&s
->state
, *current_active_state
,
2883 MIGRATION_STATUS_PRE_SWITCHOVER
);
2884 qemu_sem_wait(&s
->pause_sem
);
2885 migrate_set_state(&s
->state
, MIGRATION_STATUS_PRE_SWITCHOVER
,
2887 *current_active_state
= new_state
;
2888 qemu_mutex_lock_iothread();
2891 return s
->state
== new_state
? 0 : -EINVAL
;
2895 * migration_completion: Used by migration_thread when there's not much left.
2896 * The caller 'breaks' the loop when this returns.
2898 * @s: Current migration state
2900 static void migration_completion(MigrationState
*s
)
2903 int current_active_state
= s
->state
;
2905 if (s
->state
== MIGRATION_STATUS_ACTIVE
) {
2906 qemu_mutex_lock_iothread();
2907 s
->downtime_start
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
2908 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER
, NULL
);
2909 s
->vm_was_running
= runstate_is_running();
2910 ret
= global_state_store();
2913 bool inactivate
= !migrate_colo_enabled();
2914 ret
= vm_stop_force_state(RUN_STATE_FINISH_MIGRATE
);
2916 ret
= migration_maybe_pause(s
, ¤t_active_state
,
2917 MIGRATION_STATUS_DEVICE
);
2920 qemu_file_set_rate_limit(s
->to_dst_file
, INT64_MAX
);
2921 ret
= qemu_savevm_state_complete_precopy(s
->to_dst_file
, false,
2924 if (inactivate
&& ret
>= 0) {
2925 s
->block_inactive
= true;
2928 qemu_mutex_unlock_iothread();
2933 } else if (s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
) {
2934 trace_migration_completion_postcopy_end();
2936 qemu_savevm_state_complete_postcopy(s
->to_dst_file
);
2937 trace_migration_completion_postcopy_end_after_complete();
2941 * If rp was opened we must clean up the thread before
2942 * cleaning everything else up (since if there are no failures
2943 * it will wait for the destination to send it's status in
2946 if (s
->rp_state
.from_dst_file
) {
2948 trace_migration_return_path_end_before();
2949 rp_error
= await_return_path_close_on_source(s
);
2950 trace_migration_return_path_end_after(rp_error
);
2952 goto fail_invalidate
;
2956 if (qemu_file_get_error(s
->to_dst_file
)) {
2957 trace_migration_completion_file_err();
2958 goto fail_invalidate
;
2961 if (!migrate_colo_enabled()) {
2962 migrate_set_state(&s
->state
, current_active_state
,
2963 MIGRATION_STATUS_COMPLETED
);
2969 /* If not doing postcopy, vm_start() will be called: let's regain
2970 * control on images.
2972 if (s
->state
== MIGRATION_STATUS_ACTIVE
||
2973 s
->state
== MIGRATION_STATUS_DEVICE
) {
2974 Error
*local_err
= NULL
;
2976 qemu_mutex_lock_iothread();
2977 bdrv_invalidate_cache_all(&local_err
);
2979 error_report_err(local_err
);
2981 s
->block_inactive
= false;
2983 qemu_mutex_unlock_iothread();
2987 migrate_set_state(&s
->state
, current_active_state
,
2988 MIGRATION_STATUS_FAILED
);
2991 bool migrate_colo_enabled(void)
2993 MigrationState
*s
= migrate_get_current();
2994 return s
->enabled_capabilities
[MIGRATION_CAPABILITY_X_COLO
];
2997 typedef enum MigThrError
{
2998 /* No error detected */
2999 MIG_THR_ERR_NONE
= 0,
3000 /* Detected error, but resumed successfully */
3001 MIG_THR_ERR_RECOVERED
= 1,
3002 /* Detected fatal error, need to exit */
3003 MIG_THR_ERR_FATAL
= 2,
3006 static int postcopy_resume_handshake(MigrationState
*s
)
3008 qemu_savevm_send_postcopy_resume(s
->to_dst_file
);
3010 while (s
->state
== MIGRATION_STATUS_POSTCOPY_RECOVER
) {
3011 qemu_sem_wait(&s
->rp_state
.rp_sem
);
3014 if (s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
) {
3021 /* Return zero if success, or <0 for error */
3022 static int postcopy_do_resume(MigrationState
*s
)
3027 * Call all the resume_prepare() hooks, so that modules can be
3028 * ready for the migration resume.
3030 ret
= qemu_savevm_state_resume_prepare(s
);
3032 error_report("%s: resume_prepare() failure detected: %d",
3038 * Last handshake with destination on the resume (destination will
3039 * switch to postcopy-active afterwards)
3041 ret
= postcopy_resume_handshake(s
);
3043 error_report("%s: handshake failed: %d", __func__
, ret
);
3051 * We don't return until we are in a safe state to continue current
3052 * postcopy migration. Returns MIG_THR_ERR_RECOVERED if recovered, or
3053 * MIG_THR_ERR_FATAL if unrecovery failure happened.
3055 static MigThrError
postcopy_pause(MigrationState
*s
)
3057 assert(s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
);
3062 migrate_set_state(&s
->state
, s
->state
,
3063 MIGRATION_STATUS_POSTCOPY_PAUSED
);
3065 /* Current channel is possibly broken. Release it. */
3066 assert(s
->to_dst_file
);
3067 qemu_mutex_lock(&s
->qemu_file_lock
);
3068 file
= s
->to_dst_file
;
3069 s
->to_dst_file
= NULL
;
3070 qemu_mutex_unlock(&s
->qemu_file_lock
);
3072 qemu_file_shutdown(file
);
3075 error_report("Detected IO failure for postcopy. "
3076 "Migration paused.");
3079 * We wait until things fixed up. Then someone will setup the
3080 * status back for us.
3082 while (s
->state
== MIGRATION_STATUS_POSTCOPY_PAUSED
) {
3083 qemu_sem_wait(&s
->postcopy_pause_sem
);
3086 if (s
->state
== MIGRATION_STATUS_POSTCOPY_RECOVER
) {
3087 /* Woken up by a recover procedure. Give it a shot */
3090 * Firstly, let's wake up the return path now, with a new
3091 * return path channel.
3093 qemu_sem_post(&s
->postcopy_pause_rp_sem
);
3095 /* Do the resume logic */
3096 if (postcopy_do_resume(s
) == 0) {
3097 /* Let's continue! */
3098 trace_postcopy_pause_continued();
3099 return MIG_THR_ERR_RECOVERED
;
3102 * Something wrong happened during the recovery, let's
3103 * pause again. Pause is always better than throwing
3109 /* This is not right... Time to quit. */
3110 return MIG_THR_ERR_FATAL
;
3115 static MigThrError
migration_detect_error(MigrationState
*s
)
3118 int state
= s
->state
;
3119 Error
*local_error
= NULL
;
3121 if (state
== MIGRATION_STATUS_CANCELLING
||
3122 state
== MIGRATION_STATUS_CANCELLED
) {
3123 /* End the migration, but don't set the state to failed */
3124 return MIG_THR_ERR_FATAL
;
3127 /* Try to detect any file errors */
3128 ret
= qemu_file_get_error_obj(s
->to_dst_file
, &local_error
);
3130 /* Everything is fine */
3131 assert(!local_error
);
3132 return MIG_THR_ERR_NONE
;
3136 migrate_set_error(s
, local_error
);
3137 error_free(local_error
);
3140 if (state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
&& ret
== -EIO
) {
3142 * For postcopy, we allow the network to be down for a
3143 * while. After that, it can be continued by a
3146 return postcopy_pause(s
);
3149 * For precopy (or postcopy with error outside IO), we fail
3152 migrate_set_state(&s
->state
, state
, MIGRATION_STATUS_FAILED
);
3153 trace_migration_thread_file_err();
3155 /* Time to stop the migration, now. */
3156 return MIG_THR_ERR_FATAL
;
3160 /* How many bytes have we transferred since the beginning of the migration */
3161 static uint64_t migration_total_bytes(MigrationState
*s
)
3163 return qemu_ftell(s
->to_dst_file
) + ram_counters
.multifd_bytes
;
3166 static void migration_calculate_complete(MigrationState
*s
)
3168 uint64_t bytes
= migration_total_bytes(s
);
3169 int64_t end_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
3170 int64_t transfer_time
;
3172 s
->total_time
= end_time
- s
->start_time
;
3175 * It's still not set, so we are precopy migration. For
3176 * postcopy, downtime is calculated during postcopy_start().
3178 s
->downtime
= end_time
- s
->downtime_start
;
3181 transfer_time
= s
->total_time
- s
->setup_time
;
3182 if (transfer_time
) {
3183 s
->mbps
= ((double) bytes
* 8.0) / transfer_time
/ 1000;
3187 static void update_iteration_initial_status(MigrationState
*s
)
3190 * Update these three fields at the same time to avoid mismatch info lead
3191 * wrong speed calculation.
3193 s
->iteration_start_time
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
3194 s
->iteration_initial_bytes
= migration_total_bytes(s
);
3195 s
->iteration_initial_pages
= ram_get_total_transferred_pages();
3198 static void migration_update_counters(MigrationState
*s
,
3199 int64_t current_time
)
3201 uint64_t transferred
, transferred_pages
, time_spent
;
3202 uint64_t current_bytes
; /* bytes transferred since the beginning */
3205 if (current_time
< s
->iteration_start_time
+ BUFFER_DELAY
) {
3209 current_bytes
= migration_total_bytes(s
);
3210 transferred
= current_bytes
- s
->iteration_initial_bytes
;
3211 time_spent
= current_time
- s
->iteration_start_time
;
3212 bandwidth
= (double)transferred
/ time_spent
;
3213 s
->threshold_size
= bandwidth
* s
->parameters
.downtime_limit
;
3215 s
->mbps
= (((double) transferred
* 8.0) /
3216 ((double) time_spent
/ 1000.0)) / 1000.0 / 1000.0;
3218 transferred_pages
= ram_get_total_transferred_pages() -
3219 s
->iteration_initial_pages
;
3220 s
->pages_per_second
= (double) transferred_pages
/
3221 (((double) time_spent
/ 1000.0));
3224 * if we haven't sent anything, we don't want to
3225 * recalculate. 10000 is a small enough number for our purposes
3227 if (ram_counters
.dirty_pages_rate
&& transferred
> 10000) {
3228 s
->expected_downtime
= ram_counters
.remaining
/ bandwidth
;
3231 qemu_file_reset_rate_limit(s
->to_dst_file
);
3233 update_iteration_initial_status(s
);
3235 trace_migrate_transferred(transferred
, time_spent
,
3236 bandwidth
, s
->threshold_size
);
3239 /* Migration thread iteration status */
3241 MIG_ITERATE_RESUME
, /* Resume current iteration */
3242 MIG_ITERATE_SKIP
, /* Skip current iteration */
3243 MIG_ITERATE_BREAK
, /* Break the loop */
3247 * Return true if continue to the next iteration directly, false
3250 static MigIterateState
migration_iteration_run(MigrationState
*s
)
3252 uint64_t pending_size
, pend_pre
, pend_compat
, pend_post
;
3253 bool in_postcopy
= s
->state
== MIGRATION_STATUS_POSTCOPY_ACTIVE
;
3255 qemu_savevm_state_pending(s
->to_dst_file
, s
->threshold_size
, &pend_pre
,
3256 &pend_compat
, &pend_post
);
3257 pending_size
= pend_pre
+ pend_compat
+ pend_post
;
3259 trace_migrate_pending(pending_size
, s
->threshold_size
,
3260 pend_pre
, pend_compat
, pend_post
);
3262 if (pending_size
&& pending_size
>= s
->threshold_size
) {
3263 /* Still a significant amount to transfer */
3264 if (!in_postcopy
&& pend_pre
<= s
->threshold_size
&&
3265 atomic_read(&s
->start_postcopy
)) {
3266 if (postcopy_start(s
)) {
3267 error_report("%s: postcopy failed to start", __func__
);
3269 return MIG_ITERATE_SKIP
;
3271 /* Just another iteration step */
3272 qemu_savevm_state_iterate(s
->to_dst_file
, in_postcopy
);
3274 trace_migration_thread_low_pending(pending_size
);
3275 migration_completion(s
);
3276 return MIG_ITERATE_BREAK
;
3279 return MIG_ITERATE_RESUME
;
3282 static void migration_iteration_finish(MigrationState
*s
)
3284 /* If we enabled cpu throttling for auto-converge, turn it off. */
3285 cpu_throttle_stop();
3287 qemu_mutex_lock_iothread();
3289 case MIGRATION_STATUS_COMPLETED
:
3290 migration_calculate_complete(s
);
3291 runstate_set(RUN_STATE_POSTMIGRATE
);
3294 case MIGRATION_STATUS_ACTIVE
:
3296 * We should really assert here, but since it's during
3297 * migration, let's try to reduce the usage of assertions.
3299 if (!migrate_colo_enabled()) {
3300 error_report("%s: critical error: calling COLO code without "
3301 "COLO enabled", __func__
);
3303 migrate_start_colo_process(s
);
3305 * Fixme: we will run VM in COLO no matter its old running state.
3306 * After exited COLO, we will keep running.
3308 s
->vm_was_running
= true;
3310 case MIGRATION_STATUS_FAILED
:
3311 case MIGRATION_STATUS_CANCELLED
:
3312 case MIGRATION_STATUS_CANCELLING
:
3313 if (s
->vm_was_running
) {
3316 if (runstate_check(RUN_STATE_FINISH_MIGRATE
)) {
3317 runstate_set(RUN_STATE_POSTMIGRATE
);
3323 /* Should not reach here, but if so, forgive the VM. */
3324 error_report("%s: Unknown ending state %d", __func__
, s
->state
);
3327 migrate_fd_cleanup_schedule(s
);
3328 qemu_mutex_unlock_iothread();
3331 void migration_make_urgent_request(void)
3333 qemu_sem_post(&migrate_get_current()->rate_limit_sem
);
3336 void migration_consume_urgent_request(void)
3338 qemu_sem_wait(&migrate_get_current()->rate_limit_sem
);
3341 /* Returns true if the rate limiting was broken by an urgent request */
3342 bool migration_rate_limit(void)
3344 int64_t now
= qemu_clock_get_ms(QEMU_CLOCK_REALTIME
);
3345 MigrationState
*s
= migrate_get_current();
3347 bool urgent
= false;
3348 migration_update_counters(s
, now
);
3349 if (qemu_file_rate_limit(s
->to_dst_file
)) {
3351 * Wait for a delay to do rate limiting OR
3352 * something urgent to post the semaphore.
3354 int ms
= s
->iteration_start_time
+ BUFFER_DELAY
- now
;
3355 trace_migration_rate_limit_pre(ms
);
3356 if (qemu_sem_timedwait(&s
->rate_limit_sem
, ms
) == 0) {
3358 * We were woken by one or more urgent things but
3359 * the timedwait will have consumed one of them.
3360 * The service routine for the urgent wake will dec
3361 * the semaphore itself for each item it consumes,
3362 * so add this one we just eat back.
3364 qemu_sem_post(&s
->rate_limit_sem
);
3367 trace_migration_rate_limit_post(urgent
);
3373 * Master migration thread on the source VM.
3374 * It drives the migration and pumps the data down the outgoing channel.
3376 static void *migration_thread(void *opaque
)
3378 MigrationState
*s
= opaque
;
3379 int64_t setup_start
= qemu_clock_get_ms(QEMU_CLOCK_HOST
);
3380 MigThrError thr_error
;
3381 bool urgent
= false;
3383 rcu_register_thread();
3385 object_ref(OBJECT(s
));
3386 update_iteration_initial_status(s
);
3388 qemu_savevm_state_header(s
->to_dst_file
);
3391 * If we opened the return path, we need to make sure dst has it
3394 if (s
->rp_state
.from_dst_file
) {
3395 /* Now tell the dest that it should open its end so it can reply */
3396 qemu_savevm_send_open_return_path(s
->to_dst_file
);
3398 /* And do a ping that will make stuff easier to debug */
3399 qemu_savevm_send_ping(s
->to_dst_file
, 1);
3402 if (migrate_postcopy()) {
3404 * Tell the destination that we *might* want to do postcopy later;
3405 * if the other end can't do postcopy it should fail now, nice and
3408 qemu_savevm_send_postcopy_advise(s
->to_dst_file
);
3411 if (migrate_colo_enabled()) {
3412 /* Notify migration destination that we enable COLO */
3413 qemu_savevm_send_colo_enable(s
->to_dst_file
);
3416 qemu_savevm_state_setup(s
->to_dst_file
);
3418 if (qemu_savevm_state_guest_unplug_pending()) {
3419 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
3420 MIGRATION_STATUS_WAIT_UNPLUG
);
3422 while (s
->state
== MIGRATION_STATUS_WAIT_UNPLUG
&&
3423 qemu_savevm_state_guest_unplug_pending()) {
3424 qemu_sem_timedwait(&s
->wait_unplug_sem
, 250);
3427 migrate_set_state(&s
->state
, MIGRATION_STATUS_WAIT_UNPLUG
,
3428 MIGRATION_STATUS_ACTIVE
);
3431 s
->setup_time
= qemu_clock_get_ms(QEMU_CLOCK_HOST
) - setup_start
;
3432 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
3433 MIGRATION_STATUS_ACTIVE
);
3435 trace_migration_thread_setup_complete();
3437 while (migration_is_active(s
)) {
3438 if (urgent
|| !qemu_file_rate_limit(s
->to_dst_file
)) {
3439 MigIterateState iter_state
= migration_iteration_run(s
);
3440 if (iter_state
== MIG_ITERATE_SKIP
) {
3442 } else if (iter_state
== MIG_ITERATE_BREAK
) {
3448 * Try to detect any kind of failures, and see whether we
3449 * should stop the migration now.
3451 thr_error
= migration_detect_error(s
);
3452 if (thr_error
== MIG_THR_ERR_FATAL
) {
3453 /* Stop migration */
3455 } else if (thr_error
== MIG_THR_ERR_RECOVERED
) {
3457 * Just recovered from a e.g. network failure, reset all
3458 * the local variables. This is important to avoid
3459 * breaking transferred_bytes and bandwidth calculation
3461 update_iteration_initial_status(s
);
3464 urgent
= migration_rate_limit();
3467 trace_migration_thread_after_loop();
3468 migration_iteration_finish(s
);
3469 object_unref(OBJECT(s
));
3470 rcu_unregister_thread();
3474 void migrate_fd_connect(MigrationState
*s
, Error
*error_in
)
3476 Error
*local_err
= NULL
;
3478 bool resume
= s
->state
== MIGRATION_STATUS_POSTCOPY_PAUSED
;
3480 s
->expected_downtime
= s
->parameters
.downtime_limit
;
3481 s
->cleanup_bh
= qemu_bh_new(migrate_fd_cleanup_bh
, s
);
3483 migrate_fd_error(s
, error_in
);
3484 migrate_fd_cleanup(s
);
3489 /* This is a resumed migration */
3490 rate_limit
= s
->parameters
.max_postcopy_bandwidth
/
3493 /* This is a fresh new migration */
3494 rate_limit
= s
->parameters
.max_bandwidth
/ XFER_LIMIT_RATIO
;
3496 /* Notify before starting migration thread */
3497 notifier_list_notify(&migration_state_notifiers
, s
);
3500 qemu_file_set_rate_limit(s
->to_dst_file
, rate_limit
);
3501 qemu_file_set_blocking(s
->to_dst_file
, true);
3504 * Open the return path. For postcopy, it is used exclusively. For
3505 * precopy, only if user specified "return-path" capability would
3506 * QEMU uses the return path.
3508 if (migrate_postcopy_ram() || migrate_use_return_path()) {
3509 if (open_return_path_on_source(s
, !resume
)) {
3510 error_report("Unable to open return-path for postcopy");
3511 migrate_set_state(&s
->state
, s
->state
, MIGRATION_STATUS_FAILED
);
3512 migrate_fd_cleanup(s
);
3518 /* Wakeup the main migration thread to do the recovery */
3519 migrate_set_state(&s
->state
, MIGRATION_STATUS_POSTCOPY_PAUSED
,
3520 MIGRATION_STATUS_POSTCOPY_RECOVER
);
3521 qemu_sem_post(&s
->postcopy_pause_sem
);
3525 if (multifd_save_setup(&local_err
) != 0) {
3526 error_report_err(local_err
);
3527 migrate_set_state(&s
->state
, MIGRATION_STATUS_SETUP
,
3528 MIGRATION_STATUS_FAILED
);
3529 migrate_fd_cleanup(s
);
3532 qemu_thread_create(&s
->thread
, "live_migration", migration_thread
, s
,
3533 QEMU_THREAD_JOINABLE
);
3534 s
->migration_thread_running
= true;
3537 void migration_global_dump(Monitor
*mon
)
3539 MigrationState
*ms
= migrate_get_current();
3541 monitor_printf(mon
, "globals:\n");
3542 monitor_printf(mon
, "store-global-state: %s\n",
3543 ms
->store_global_state
? "on" : "off");
3544 monitor_printf(mon
, "only-migratable: %s\n",
3545 only_migratable
? "on" : "off");
3546 monitor_printf(mon
, "send-configuration: %s\n",
3547 ms
->send_configuration
? "on" : "off");
3548 monitor_printf(mon
, "send-section-footer: %s\n",
3549 ms
->send_section_footer
? "on" : "off");
3550 monitor_printf(mon
, "decompress-error-check: %s\n",
3551 ms
->decompress_error_check
? "on" : "off");
3552 monitor_printf(mon
, "clear-bitmap-shift: %u\n",
3553 ms
->clear_bitmap_shift
);
3556 #define DEFINE_PROP_MIG_CAP(name, x) \
3557 DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
3559 static Property migration_properties
[] = {
3560 DEFINE_PROP_BOOL("store-global-state", MigrationState
,
3561 store_global_state
, true),
3562 DEFINE_PROP_BOOL("send-configuration", MigrationState
,
3563 send_configuration
, true),
3564 DEFINE_PROP_BOOL("send-section-footer", MigrationState
,
3565 send_section_footer
, true),
3566 DEFINE_PROP_BOOL("decompress-error-check", MigrationState
,
3567 decompress_error_check
, true),
3568 DEFINE_PROP_UINT8("x-clear-bitmap-shift", MigrationState
,
3569 clear_bitmap_shift
, CLEAR_BITMAP_SHIFT_DEFAULT
),
3571 /* Migration parameters */
3572 DEFINE_PROP_UINT8("x-compress-level", MigrationState
,
3573 parameters
.compress_level
,
3574 DEFAULT_MIGRATE_COMPRESS_LEVEL
),
3575 DEFINE_PROP_UINT8("x-compress-threads", MigrationState
,
3576 parameters
.compress_threads
,
3577 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT
),
3578 DEFINE_PROP_BOOL("x-compress-wait-thread", MigrationState
,
3579 parameters
.compress_wait_thread
, true),
3580 DEFINE_PROP_UINT8("x-decompress-threads", MigrationState
,
3581 parameters
.decompress_threads
,
3582 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT
),
3583 DEFINE_PROP_UINT8("x-throttle-trigger-threshold", MigrationState
,
3584 parameters
.throttle_trigger_threshold
,
3585 DEFAULT_MIGRATE_THROTTLE_TRIGGER_THRESHOLD
),
3586 DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState
,
3587 parameters
.cpu_throttle_initial
,
3588 DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL
),
3589 DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState
,
3590 parameters
.cpu_throttle_increment
,
3591 DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT
),
3592 DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState
,
3593 parameters
.max_bandwidth
, MAX_THROTTLE
),
3594 DEFINE_PROP_UINT64("x-downtime-limit", MigrationState
,
3595 parameters
.downtime_limit
,
3596 DEFAULT_MIGRATE_SET_DOWNTIME
),
3597 DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState
,
3598 parameters
.x_checkpoint_delay
,
3599 DEFAULT_MIGRATE_X_CHECKPOINT_DELAY
),
3600 DEFINE_PROP_UINT8("multifd-channels", MigrationState
,
3601 parameters
.multifd_channels
,
3602 DEFAULT_MIGRATE_MULTIFD_CHANNELS
),
3603 DEFINE_PROP_MULTIFD_COMPRESSION("multifd-compression", MigrationState
,
3604 parameters
.multifd_compression
,
3605 DEFAULT_MIGRATE_MULTIFD_COMPRESSION
),
3606 DEFINE_PROP_UINT8("multifd-zlib-level", MigrationState
,
3607 parameters
.multifd_zlib_level
,
3608 DEFAULT_MIGRATE_MULTIFD_ZLIB_LEVEL
),
3609 DEFINE_PROP_UINT8("multifd-zstd-level", MigrationState
,
3610 parameters
.multifd_zstd_level
,
3611 DEFAULT_MIGRATE_MULTIFD_ZSTD_LEVEL
),
3612 DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState
,
3613 parameters
.xbzrle_cache_size
,
3614 DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE
),
3615 DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState
,
3616 parameters
.max_postcopy_bandwidth
,
3617 DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH
),
3618 DEFINE_PROP_UINT8("max-cpu-throttle", MigrationState
,
3619 parameters
.max_cpu_throttle
,
3620 DEFAULT_MIGRATE_MAX_CPU_THROTTLE
),
3621 DEFINE_PROP_SIZE("announce-initial", MigrationState
,
3622 parameters
.announce_initial
,
3623 DEFAULT_MIGRATE_ANNOUNCE_INITIAL
),
3624 DEFINE_PROP_SIZE("announce-max", MigrationState
,
3625 parameters
.announce_max
,
3626 DEFAULT_MIGRATE_ANNOUNCE_MAX
),
3627 DEFINE_PROP_SIZE("announce-rounds", MigrationState
,
3628 parameters
.announce_rounds
,
3629 DEFAULT_MIGRATE_ANNOUNCE_ROUNDS
),
3630 DEFINE_PROP_SIZE("announce-step", MigrationState
,
3631 parameters
.announce_step
,
3632 DEFAULT_MIGRATE_ANNOUNCE_STEP
),
3634 /* Migration capabilities */
3635 DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE
),
3636 DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL
),
3637 DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE
),
3638 DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS
),
3639 DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS
),
3640 DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS
),
3641 DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM
),
3642 DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO
),
3643 DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM
),
3644 DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK
),
3645 DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH
),
3646 DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_MULTIFD
),
3648 DEFINE_PROP_END_OF_LIST(),
3651 static void migration_class_init(ObjectClass
*klass
, void *data
)
3653 DeviceClass
*dc
= DEVICE_CLASS(klass
);
3655 dc
->user_creatable
= false;
3656 device_class_set_props(dc
, migration_properties
);
3659 static void migration_instance_finalize(Object
*obj
)
3661 MigrationState
*ms
= MIGRATION_OBJ(obj
);
3662 MigrationParameters
*params
= &ms
->parameters
;
3664 qemu_mutex_destroy(&ms
->error_mutex
);
3665 qemu_mutex_destroy(&ms
->qemu_file_lock
);
3666 g_free(params
->tls_hostname
);
3667 g_free(params
->tls_creds
);
3668 qemu_sem_destroy(&ms
->wait_unplug_sem
);
3669 qemu_sem_destroy(&ms
->rate_limit_sem
);
3670 qemu_sem_destroy(&ms
->pause_sem
);
3671 qemu_sem_destroy(&ms
->postcopy_pause_sem
);
3672 qemu_sem_destroy(&ms
->postcopy_pause_rp_sem
);
3673 qemu_sem_destroy(&ms
->rp_state
.rp_sem
);
3674 error_free(ms
->error
);
3677 static void migration_instance_init(Object
*obj
)
3679 MigrationState
*ms
= MIGRATION_OBJ(obj
);
3680 MigrationParameters
*params
= &ms
->parameters
;
3682 ms
->state
= MIGRATION_STATUS_NONE
;
3684 ms
->pages_per_second
= -1;
3685 qemu_sem_init(&ms
->pause_sem
, 0);
3686 qemu_mutex_init(&ms
->error_mutex
);
3688 params
->tls_hostname
= g_strdup("");
3689 params
->tls_creds
= g_strdup("");
3691 /* Set has_* up only for parameter checks */
3692 params
->has_compress_level
= true;
3693 params
->has_compress_threads
= true;
3694 params
->has_decompress_threads
= true;
3695 params
->has_throttle_trigger_threshold
= true;
3696 params
->has_cpu_throttle_initial
= true;
3697 params
->has_cpu_throttle_increment
= true;
3698 params
->has_max_bandwidth
= true;
3699 params
->has_downtime_limit
= true;
3700 params
->has_x_checkpoint_delay
= true;
3701 params
->has_block_incremental
= true;
3702 params
->has_multifd_channels
= true;
3703 params
->has_multifd_compression
= true;
3704 params
->has_multifd_zlib_level
= true;
3705 params
->has_multifd_zstd_level
= true;
3706 params
->has_xbzrle_cache_size
= true;
3707 params
->has_max_postcopy_bandwidth
= true;
3708 params
->has_max_cpu_throttle
= true;
3709 params
->has_announce_initial
= true;
3710 params
->has_announce_max
= true;
3711 params
->has_announce_rounds
= true;
3712 params
->has_announce_step
= true;
3714 qemu_sem_init(&ms
->postcopy_pause_sem
, 0);
3715 qemu_sem_init(&ms
->postcopy_pause_rp_sem
, 0);
3716 qemu_sem_init(&ms
->rp_state
.rp_sem
, 0);
3717 qemu_sem_init(&ms
->rate_limit_sem
, 0);
3718 qemu_sem_init(&ms
->wait_unplug_sem
, 0);
3719 qemu_mutex_init(&ms
->qemu_file_lock
);
3723 * Return true if check pass, false otherwise. Error will be put
3724 * inside errp if provided.
3726 static bool migration_object_check(MigrationState
*ms
, Error
**errp
)
3728 MigrationCapabilityStatusList
*head
= NULL
;
3729 /* Assuming all off */
3730 bool cap_list
[MIGRATION_CAPABILITY__MAX
] = { 0 }, ret
;
3733 if (!migrate_params_check(&ms
->parameters
, errp
)) {
3737 for (i
= 0; i
< MIGRATION_CAPABILITY__MAX
; i
++) {
3738 if (ms
->enabled_capabilities
[i
]) {
3739 head
= migrate_cap_add(head
, i
, true);
3743 ret
= migrate_caps_check(cap_list
, head
, errp
);
3745 /* It works with head == NULL */
3746 qapi_free_MigrationCapabilityStatusList(head
);
3751 static const TypeInfo migration_type
= {
3752 .name
= TYPE_MIGRATION
,
3754 * NOTE: TYPE_MIGRATION is not really a device, as the object is
3755 * not created using qdev_create(), it is not attached to the qdev
3756 * device tree, and it is never realized.
3758 * TODO: Make this TYPE_OBJECT once QOM provides something like
3759 * TYPE_DEVICE's "-global" properties.
3761 .parent
= TYPE_DEVICE
,
3762 .class_init
= migration_class_init
,
3763 .class_size
= sizeof(MigrationClass
),
3764 .instance_size
= sizeof(MigrationState
),
3765 .instance_init
= migration_instance_init
,
3766 .instance_finalize
= migration_instance_finalize
,
3769 static void register_migration_types(void)
3771 type_register_static(&migration_type
);
3774 type_init(register_migration_types
);