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target/arm: Register second AddressSpace for secure v8M CPUs
[qemu/kevin.git] / migration / migration.c
blob1a2b3ebd1a7c3b574ba35b07ac8c47848ffdb576
1 /*
2 * QEMU live migration
3 *
4 * Copyright IBM, Corp. 2008
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
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.
14 */
15
16 #include "qemu/osdep.h"
17 #include "qemu/cutils.h"
18 #include "qemu/error-report.h"
19 #include "migration/blocker.h"
20 #include "exec.h"
21 #include "fd.h"
22 #include "socket.h"
23 #include "rdma.h"
24 #include "ram.h"
25 #include "migration/global_state.h"
26 #include "migration/misc.h"
27 #include "migration.h"
28 #include "savevm.h"
29 #include "qemu-file-channel.h"
30 #include "qemu-file.h"
31 #include "migration/vmstate.h"
32 #include "block/block.h"
33 #include "qapi/qmp/qerror.h"
34 #include "qemu/rcu.h"
35 #include "block.h"
36 #include "postcopy-ram.h"
37 #include "qemu/thread.h"
38 #include "qmp-commands.h"
39 #include "trace.h"
40 #include "qapi-event.h"
41 #include "exec/target_page.h"
42 #include "io/channel-buffer.h"
43 #include "migration/colo.h"
44 #include "hw/boards.h"
45 #include "monitor/monitor.h"
46
47 #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */
48
49 /* Amount of time to allocate to each "chunk" of bandwidth-throttled
50 * data. */
51 #define BUFFER_DELAY 100
52 #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
53
54 /* Time in milliseconds we are allowed to stop the source,
55 * for sending the last part */
56 #define DEFAULT_MIGRATE_SET_DOWNTIME 300
57
58 /* Maximum migrate downtime set to 2000 seconds */
59 #define MAX_MIGRATE_DOWNTIME_SECONDS 2000
60 #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
61
62 /* Default compression thread count */
63 #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
64 /* Default decompression thread count, usually decompression is at
65 * least 4 times as fast as compression.*/
66 #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
67 /*0: means nocompress, 1: best speed, ... 9: best compress ratio */
68 #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
69 /* Define default autoconverge cpu throttle migration parameters */
70 #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
71 #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
72
73 /* Migration XBZRLE default cache size */
74 #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
75
76 /* The delay time (in ms) between two COLO checkpoints
77 * Note: Please change this default value to 10000 when we support hybrid mode.
78 */
79 #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200
80
81 static NotifierList migration_state_notifiers =
82 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
83
84 static bool deferred_incoming;
85
86 /* Messages sent on the return path from destination to source */
87 enum mig_rp_message_type {
88 MIG_RP_MSG_INVALID = 0, /* Must be 0 */
89 MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */
90 MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */
91
92 MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */
93 MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */
94
95 MIG_RP_MSG_MAX
96 };
97
98 /* When we add fault tolerance, we could have several
99 migrations at once. For now we don't need to add
100 dynamic creation of migration */
101
102 static MigrationState *current_migration;
103
104 static bool migration_object_check(MigrationState *ms, Error **errp);
105
106 void migration_object_init(void)
107 {
108 MachineState *ms = MACHINE(qdev_get_machine());
109 Error *err = NULL;
110
111 /* This can only be called once. */
112 assert(!current_migration);
113 current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION));
114
115 if (!migration_object_check(current_migration, &err)) {
116 error_report_err(err);
117 exit(1);
118 }
119
120 /*
121 * We cannot really do this in migration_instance_init() since at
122 * that time global properties are not yet applied, then this
123 * value will be definitely replaced by something else.
124 */
125 if (ms->enforce_config_section) {
126 current_migration->send_configuration = true;
127 }
128 }
129
130 /* For outgoing */
131 MigrationState *migrate_get_current(void)
132 {
133 /* This can only be called after the object created. */
134 assert(current_migration);
135 return current_migration;
136 }
137
138 MigrationIncomingState *migration_incoming_get_current(void)
139 {
140 static bool once;
141 static MigrationIncomingState mis_current;
142
143 if (!once) {
144 mis_current.state = MIGRATION_STATUS_NONE;
145 memset(&mis_current, 0, sizeof(MigrationIncomingState));
146 qemu_mutex_init(&mis_current.rp_mutex);
147 qemu_event_init(&mis_current.main_thread_load_event, false);
148 once = true;
149 }
150 return &mis_current;
151 }
152
153 void migration_incoming_state_destroy(void)
154 {
155 struct MigrationIncomingState *mis = migration_incoming_get_current();
156
157 if (mis->to_src_file) {
158 /* Tell source that we are done */
159 migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0);
160 qemu_fclose(mis->to_src_file);
161 mis->to_src_file = NULL;
162 }
163
164 if (mis->from_src_file) {
165 qemu_fclose(mis->from_src_file);
166 mis->from_src_file = NULL;
167 }
168
169 qemu_event_destroy(&mis->main_thread_load_event);
170 }
171
172 static void migrate_generate_event(int new_state)
173 {
174 if (migrate_use_events()) {
175 qapi_event_send_migration(new_state, &error_abort);
176 }
177 }
178
179 /*
180 * Called on -incoming with a defer: uri.
181 * The migration can be started later after any parameters have been
182 * changed.
183 */
184 static void deferred_incoming_migration(Error **errp)
185 {
186 if (deferred_incoming) {
187 error_setg(errp, "Incoming migration already deferred");
188 }
189 deferred_incoming = true;
190 }
191
192 /*
193 * Send a message on the return channel back to the source
194 * of the migration.
195 */
196 static void migrate_send_rp_message(MigrationIncomingState *mis,
197 enum mig_rp_message_type message_type,
198 uint16_t len, void *data)
199 {
200 trace_migrate_send_rp_message((int)message_type, len);
201 qemu_mutex_lock(&mis->rp_mutex);
202 qemu_put_be16(mis->to_src_file, (unsigned int)message_type);
203 qemu_put_be16(mis->to_src_file, len);
204 qemu_put_buffer(mis->to_src_file, data, len);
205 qemu_fflush(mis->to_src_file);
206 qemu_mutex_unlock(&mis->rp_mutex);
207 }
208
209 /* Request a range of pages from the source VM at the given
210 * start address.
211 * rbname: Name of the RAMBlock to request the page in, if NULL it's the same
212 * as the last request (a name must have been given previously)
213 * Start: Address offset within the RB
214 * Len: Length in bytes required - must be a multiple of pagesize
215 */
216 void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
217 ram_addr_t start, size_t len)
218 {
219 uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */
220 size_t msglen = 12; /* start + len */
221
222 *(uint64_t *)bufc = cpu_to_be64((uint64_t)start);
223 *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len);
224
225 if (rbname) {
226 int rbname_len = strlen(rbname);
227 assert(rbname_len < 256);
228
229 bufc[msglen++] = rbname_len;
230 memcpy(bufc + msglen, rbname, rbname_len);
231 msglen += rbname_len;
232 migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc);
233 } else {
234 migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc);
235 }
236 }
237
238 void qemu_start_incoming_migration(const char *uri, Error **errp)
239 {
240 const char *p;
241
242 qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort);
243 if (!strcmp(uri, "defer")) {
244 deferred_incoming_migration(errp);
245 } else if (strstart(uri, "tcp:", &p)) {
246 tcp_start_incoming_migration(p, errp);
247 #ifdef CONFIG_RDMA
248 } else if (strstart(uri, "rdma:", &p)) {
249 rdma_start_incoming_migration(p, errp);
250 #endif
251 } else if (strstart(uri, "exec:", &p)) {
252 exec_start_incoming_migration(p, errp);
253 } else if (strstart(uri, "unix:", &p)) {
254 unix_start_incoming_migration(p, errp);
255 } else if (strstart(uri, "fd:", &p)) {
256 fd_start_incoming_migration(p, errp);
257 } else {
258 error_setg(errp, "unknown migration protocol: %s", uri);
259 }
260 }
261
262 static void process_incoming_migration_bh(void *opaque)
263 {
264 Error *local_err = NULL;
265 MigrationIncomingState *mis = opaque;
266
267 /* Make sure all file formats flush their mutable metadata.
268 * If we get an error here, just don't restart the VM yet. */
269 bdrv_invalidate_cache_all(&local_err);
270 if (local_err) {
271 error_report_err(local_err);
272 local_err = NULL;
273 autostart = false;
274 }
275
276 /*
277 * This must happen after all error conditions are dealt with and
278 * we're sure the VM is going to be running on this host.
279 */
280 qemu_announce_self();
281
282 /* If global state section was not received or we are in running
283 state, we need to obey autostart. Any other state is set with
284 runstate_set. */
285
286 if (!global_state_received() ||
287 global_state_get_runstate() == RUN_STATE_RUNNING) {
288 if (autostart) {
289 vm_start();
290 } else {
291 runstate_set(RUN_STATE_PAUSED);
292 }
293 } else {
294 runstate_set(global_state_get_runstate());
295 }
296 /*
297 * This must happen after any state changes since as soon as an external
298 * observer sees this event they might start to prod at the VM assuming
299 * it's ready to use.
300 */
301 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
302 MIGRATION_STATUS_COMPLETED);
303 qemu_bh_delete(mis->bh);
304 migration_incoming_state_destroy();
305 }
306
307 static void process_incoming_migration_co(void *opaque)
308 {
309 QEMUFile *f = opaque;
310 MigrationIncomingState *mis = migration_incoming_get_current();
311 PostcopyState ps;
312 int ret;
313
314 mis->from_src_file = f;
315 mis->largest_page_size = qemu_ram_pagesize_largest();
316 postcopy_state_set(POSTCOPY_INCOMING_NONE);
317 migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
318 MIGRATION_STATUS_ACTIVE);
319 ret = qemu_loadvm_state(f);
320
321 ps = postcopy_state_get();
322 trace_process_incoming_migration_co_end(ret, ps);
323 if (ps != POSTCOPY_INCOMING_NONE) {
324 if (ps == POSTCOPY_INCOMING_ADVISE) {
325 /*
326 * Where a migration had postcopy enabled (and thus went to advise)
327 * but managed to complete within the precopy period, we can use
328 * the normal exit.
329 */
330 postcopy_ram_incoming_cleanup(mis);
331 } else if (ret >= 0) {
332 /*
333 * Postcopy was started, cleanup should happen at the end of the
334 * postcopy thread.
335 */
336 trace_process_incoming_migration_co_postcopy_end_main();
337 return;
338 }
339 /* Else if something went wrong then just fall out of the normal exit */
340 }
341
342 /* we get COLO info, and know if we are in COLO mode */
343 if (!ret && migration_incoming_enable_colo()) {
344 mis->migration_incoming_co = qemu_coroutine_self();
345 qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming",
346 colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE);
347 mis->have_colo_incoming_thread = true;
348 qemu_coroutine_yield();
349
350 /* Wait checkpoint incoming thread exit before free resource */
351 qemu_thread_join(&mis->colo_incoming_thread);
352 }
353
354 if (ret < 0) {
355 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
356 MIGRATION_STATUS_FAILED);
357 error_report("load of migration failed: %s", strerror(-ret));
358 qemu_fclose(mis->from_src_file);
359 exit(EXIT_FAILURE);
360 }
361 mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
362 qemu_bh_schedule(mis->bh);
363 }
364
365 void migration_fd_process_incoming(QEMUFile *f)
366 {
367 Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, f);
368
369 qemu_file_set_blocking(f, false);
370 qemu_coroutine_enter(co);
371 }
372
373 /*
374 * Send a 'SHUT' message on the return channel with the given value
375 * to indicate that we've finished with the RP. Non-0 value indicates
376 * error.
377 */
378 void migrate_send_rp_shut(MigrationIncomingState *mis,
379 uint32_t value)
380 {
381 uint32_t buf;
382
383 buf = cpu_to_be32(value);
384 migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf);
385 }
386
387 /*
388 * Send a 'PONG' message on the return channel with the given value
389 * (normally in response to a 'PING')
390 */
391 void migrate_send_rp_pong(MigrationIncomingState *mis,
392 uint32_t value)
393 {
394 uint32_t buf;
395
396 buf = cpu_to_be32(value);
397 migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf);
398 }
399
400 MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
401 {
402 MigrationCapabilityStatusList *head = NULL;
403 MigrationCapabilityStatusList *caps;
404 MigrationState *s = migrate_get_current();
405 int i;
406
407 caps = NULL; /* silence compiler warning */
408 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
409 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
410 if (i == MIGRATION_CAPABILITY_BLOCK) {
411 continue;
412 }
413 #endif
414 if (head == NULL) {
415 head = g_malloc0(sizeof(*caps));
416 caps = head;
417 } else {
418 caps->next = g_malloc0(sizeof(*caps));
419 caps = caps->next;
420 }
421 caps->value =
422 g_malloc(sizeof(*caps->value));
423 caps->value->capability = i;
424 caps->value->state = s->enabled_capabilities[i];
425 }
426
427 return head;
428 }
429
430 MigrationParameters *qmp_query_migrate_parameters(Error **errp)
431 {
432 MigrationParameters *params;
433 MigrationState *s = migrate_get_current();
434
435 /* TODO use QAPI_CLONE() instead of duplicating it inline */
436 params = g_malloc0(sizeof(*params));
437 params->has_compress_level = true;
438 params->compress_level = s->parameters.compress_level;
439 params->has_compress_threads = true;
440 params->compress_threads = s->parameters.compress_threads;
441 params->has_decompress_threads = true;
442 params->decompress_threads = s->parameters.decompress_threads;
443 params->has_cpu_throttle_initial = true;
444 params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
445 params->has_cpu_throttle_increment = true;
446 params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
447 params->has_tls_creds = true;
448 params->tls_creds = g_strdup(s->parameters.tls_creds);
449 params->has_tls_hostname = true;
450 params->tls_hostname = g_strdup(s->parameters.tls_hostname);
451 params->has_max_bandwidth = true;
452 params->max_bandwidth = s->parameters.max_bandwidth;
453 params->has_downtime_limit = true;
454 params->downtime_limit = s->parameters.downtime_limit;
455 params->has_x_checkpoint_delay = true;
456 params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
457 params->has_block_incremental = true;
458 params->block_incremental = s->parameters.block_incremental;
459
460 return params;
461 }
462
463 /*
464 * Return true if we're already in the middle of a migration
465 * (i.e. any of the active or setup states)
466 */
467 static bool migration_is_setup_or_active(int state)
468 {
469 switch (state) {
470 case MIGRATION_STATUS_ACTIVE:
471 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
472 case MIGRATION_STATUS_SETUP:
473 return true;
474
475 default:
476 return false;
477
478 }
479 }
480
481 static void populate_ram_info(MigrationInfo *info, MigrationState *s)
482 {
483 info->has_ram = true;
484 info->ram = g_malloc0(sizeof(*info->ram));
485 info->ram->transferred = ram_counters.transferred;
486 info->ram->total = ram_bytes_total();
487 info->ram->duplicate = ram_counters.duplicate;
488 /* legacy value. It is not used anymore */
489 info->ram->skipped = 0;
490 info->ram->normal = ram_counters.normal;
491 info->ram->normal_bytes = ram_counters.normal *
492 qemu_target_page_size();
493 info->ram->mbps = s->mbps;
494 info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
495 info->ram->postcopy_requests = ram_counters.postcopy_requests;
496 info->ram->page_size = qemu_target_page_size();
497
498 if (migrate_use_xbzrle()) {
499 info->has_xbzrle_cache = true;
500 info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
501 info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
502 info->xbzrle_cache->bytes = xbzrle_counters.bytes;
503 info->xbzrle_cache->pages = xbzrle_counters.pages;
504 info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss;
505 info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate;
506 info->xbzrle_cache->overflow = xbzrle_counters.overflow;
507 }
508
509 if (cpu_throttle_active()) {
510 info->has_cpu_throttle_percentage = true;
511 info->cpu_throttle_percentage = cpu_throttle_get_percentage();
512 }
513
514 if (s->state != MIGRATION_STATUS_COMPLETED) {
515 info->ram->remaining = ram_bytes_remaining();
516 info->ram->dirty_pages_rate = ram_counters.dirty_pages_rate;
517 }
518 }
519
520 static void populate_disk_info(MigrationInfo *info)
521 {
522 if (blk_mig_active()) {
523 info->has_disk = true;
524 info->disk = g_malloc0(sizeof(*info->disk));
525 info->disk->transferred = blk_mig_bytes_transferred();
526 info->disk->remaining = blk_mig_bytes_remaining();
527 info->disk->total = blk_mig_bytes_total();
528 }
529 }
530
531 MigrationInfo *qmp_query_migrate(Error **errp)
532 {
533 MigrationInfo *info = g_malloc0(sizeof(*info));
534 MigrationState *s = migrate_get_current();
535
536 switch (s->state) {
537 case MIGRATION_STATUS_NONE:
538 /* no migration has happened ever */
539 break;
540 case MIGRATION_STATUS_SETUP:
541 info->has_status = true;
542 info->has_total_time = false;
543 break;
544 case MIGRATION_STATUS_ACTIVE:
545 case MIGRATION_STATUS_CANCELLING:
546 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
547 /* TODO add some postcopy stats */
548 info->has_status = true;
549 info->has_total_time = true;
550 info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
551 - s->total_time;
552 info->has_expected_downtime = true;
553 info->expected_downtime = s->expected_downtime;
554 info->has_setup_time = true;
555 info->setup_time = s->setup_time;
556
557 populate_ram_info(info, s);
558 populate_disk_info(info);
559 break;
560 case MIGRATION_STATUS_COLO:
561 info->has_status = true;
562 /* TODO: display COLO specific information (checkpoint info etc.) */
563 break;
564 case MIGRATION_STATUS_COMPLETED:
565 info->has_status = true;
566 info->has_total_time = true;
567 info->total_time = s->total_time;
568 info->has_downtime = true;
569 info->downtime = s->downtime;
570 info->has_setup_time = true;
571 info->setup_time = s->setup_time;
572
573 populate_ram_info(info, s);
574 break;
575 case MIGRATION_STATUS_FAILED:
576 info->has_status = true;
577 if (s->error) {
578 info->has_error_desc = true;
579 info->error_desc = g_strdup(error_get_pretty(s->error));
580 }
581 break;
582 case MIGRATION_STATUS_CANCELLED:
583 info->has_status = true;
584 break;
585 }
586 info->status = s->state;
587
588 return info;
589 }
590
591 /**
592 * @migration_caps_check - check capability validity
593 *
594 * @cap_list: old capability list, array of bool
595 * @params: new capabilities to be applied soon
596 * @errp: set *errp if the check failed, with reason
597 *
598 * Returns true if check passed, otherwise false.
599 */
600 static bool migrate_caps_check(bool *cap_list,
601 MigrationCapabilityStatusList *params,
602 Error **errp)
603 {
604 MigrationCapabilityStatusList *cap;
605 bool old_postcopy_cap;
606
607 old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM];
608
609 for (cap = params; cap; cap = cap->next) {
610 cap_list[cap->value->capability] = cap->value->state;
611 }
612
613 #ifndef CONFIG_LIVE_BLOCK_MIGRATION
614 if (cap_list[MIGRATION_CAPABILITY_BLOCK]) {
615 error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
616 "block migration");
617 error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
618 return false;
619 }
620 #endif
621
622 if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
623 if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
624 /* The decompression threads asynchronously write into RAM
625 * rather than use the atomic copies needed to avoid
626 * userfaulting. It should be possible to fix the decompression
627 * threads for compatibility in future.
628 */
629 error_setg(errp, "Postcopy is not currently compatible "
630 "with compression");
631 return false;
632 }
633
634 /* This check is reasonably expensive, so only when it's being
635 * set the first time, also it's only the destination that needs
636 * special support.
637 */
638 if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) &&
639 !postcopy_ram_supported_by_host()) {
640 /* postcopy_ram_supported_by_host will have emitted a more
641 * detailed message
642 */
643 error_setg(errp, "Postcopy is not supported");
644 return false;
645 }
646 }
647
648 return true;
649 }
650
651 void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
652 Error **errp)
653 {
654 MigrationState *s = migrate_get_current();
655 MigrationCapabilityStatusList *cap;
656
657 if (migration_is_setup_or_active(s->state)) {
658 error_setg(errp, QERR_MIGRATION_ACTIVE);
659 return;
660 }
661
662 if (!migrate_caps_check(s->enabled_capabilities, params, errp)) {
663 return;
664 }
665
666 for (cap = params; cap; cap = cap->next) {
667 s->enabled_capabilities[cap->value->capability] = cap->value->state;
668 }
669 }
670
671 /*
672 * Check whether the parameters are valid. Error will be put into errp
673 * (if provided). Return true if valid, otherwise false.
674 */
675 static bool migrate_params_check(MigrationParameters *params, Error **errp)
676 {
677 if (params->has_compress_level &&
678 (params->compress_level < 0 || params->compress_level > 9)) {
679 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
680 "is invalid, it should be in the range of 0 to 9");
681 return false;
682 }
683
684 if (params->has_compress_threads &&
685 (params->compress_threads < 1 || params->compress_threads > 255)) {
686 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
687 "compress_threads",
688 "is invalid, it should be in the range of 1 to 255");
689 return false;
690 }
691
692 if (params->has_decompress_threads &&
693 (params->decompress_threads < 1 || params->decompress_threads > 255)) {
694 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
695 "decompress_threads",
696 "is invalid, it should be in the range of 1 to 255");
697 return false;
698 }
699
700 if (params->has_cpu_throttle_initial &&
701 (params->cpu_throttle_initial < 1 ||
702 params->cpu_throttle_initial > 99)) {
703 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
704 "cpu_throttle_initial",
705 "an integer in the range of 1 to 99");
706 return false;
707 }
708
709 if (params->has_cpu_throttle_increment &&
710 (params->cpu_throttle_increment < 1 ||
711 params->cpu_throttle_increment > 99)) {
712 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
713 "cpu_throttle_increment",
714 "an integer in the range of 1 to 99");
715 return false;
716 }
717
718 if (params->has_max_bandwidth &&
719 (params->max_bandwidth < 0 || params->max_bandwidth > SIZE_MAX)) {
720 error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the"
721 " range of 0 to %zu bytes/second", SIZE_MAX);
722 return false;
723 }
724
725 if (params->has_downtime_limit &&
726 (params->downtime_limit < 0 ||
727 params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
728 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
729 "the range of 0 to %d milliseconds",
730 MAX_MIGRATE_DOWNTIME);
731 return false;
732 }
733
734 if (params->has_x_checkpoint_delay && (params->x_checkpoint_delay < 0)) {
735 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
736 "x_checkpoint_delay",
737 "is invalid, it should be positive");
738 return false;
739 }
740
741 return true;
742 }
743
744 static void migrate_params_test_apply(MigrateSetParameters *params,
745 MigrationParameters *dest)
746 {
747 *dest = migrate_get_current()->parameters;
748
749 /* TODO use QAPI_CLONE() instead of duplicating it inline */
750
751 if (params->has_compress_level) {
752 dest->compress_level = params->compress_level;
753 }
754
755 if (params->has_compress_threads) {
756 dest->compress_threads = params->compress_threads;
757 }
758
759 if (params->has_decompress_threads) {
760 dest->decompress_threads = params->decompress_threads;
761 }
762
763 if (params->has_cpu_throttle_initial) {
764 dest->cpu_throttle_initial = params->cpu_throttle_initial;
765 }
766
767 if (params->has_cpu_throttle_increment) {
768 dest->cpu_throttle_increment = params->cpu_throttle_increment;
769 }
770
771 if (params->has_tls_creds) {
772 assert(params->tls_creds->type == QTYPE_QSTRING);
773 dest->tls_creds = g_strdup(params->tls_creds->u.s);
774 }
775
776 if (params->has_tls_hostname) {
777 assert(params->tls_hostname->type == QTYPE_QSTRING);
778 dest->tls_hostname = g_strdup(params->tls_hostname->u.s);
779 }
780
781 if (params->has_max_bandwidth) {
782 dest->max_bandwidth = params->max_bandwidth;
783 }
784
785 if (params->has_downtime_limit) {
786 dest->downtime_limit = params->downtime_limit;
787 }
788
789 if (params->has_x_checkpoint_delay) {
790 dest->x_checkpoint_delay = params->x_checkpoint_delay;
791 }
792
793 if (params->has_block_incremental) {
794 dest->block_incremental = params->block_incremental;
795 }
796 }
797
798 static void migrate_params_apply(MigrateSetParameters *params)
799 {
800 MigrationState *s = migrate_get_current();
801
802 /* TODO use QAPI_CLONE() instead of duplicating it inline */
803
804 if (params->has_compress_level) {
805 s->parameters.compress_level = params->compress_level;
806 }
807
808 if (params->has_compress_threads) {
809 s->parameters.compress_threads = params->compress_threads;
810 }
811
812 if (params->has_decompress_threads) {
813 s->parameters.decompress_threads = params->decompress_threads;
814 }
815
816 if (params->has_cpu_throttle_initial) {
817 s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
818 }
819
820 if (params->has_cpu_throttle_increment) {
821 s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
822 }
823
824 if (params->has_tls_creds) {
825 g_free(s->parameters.tls_creds);
826 assert(params->tls_creds->type == QTYPE_QSTRING);
827 s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
828 }
829
830 if (params->has_tls_hostname) {
831 g_free(s->parameters.tls_hostname);
832 assert(params->tls_hostname->type == QTYPE_QSTRING);
833 s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
834 }
835
836 if (params->has_max_bandwidth) {
837 s->parameters.max_bandwidth = params->max_bandwidth;
838 if (s->to_dst_file) {
839 qemu_file_set_rate_limit(s->to_dst_file,
840 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
841 }
842 }
843
844 if (params->has_downtime_limit) {
845 s->parameters.downtime_limit = params->downtime_limit;
846 }
847
848 if (params->has_x_checkpoint_delay) {
849 s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
850 if (migration_in_colo_state()) {
851 colo_checkpoint_notify(s);
852 }
853 }
854
855 if (params->has_block_incremental) {
856 s->parameters.block_incremental = params->block_incremental;
857 }
858 }
859
860 void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
861 {
862 MigrationParameters tmp;
863
864 /* TODO Rewrite "" to null instead */
865 if (params->has_tls_creds
866 && params->tls_creds->type == QTYPE_QNULL) {
867 QDECREF(params->tls_creds->u.n);
868 params->tls_creds->type = QTYPE_QSTRING;
869 params->tls_creds->u.s = strdup("");
870 }
871 /* TODO Rewrite "" to null instead */
872 if (params->has_tls_hostname
873 && params->tls_hostname->type == QTYPE_QNULL) {
874 QDECREF(params->tls_hostname->u.n);
875 params->tls_hostname->type = QTYPE_QSTRING;
876 params->tls_hostname->u.s = strdup("");
877 }
878
879 migrate_params_test_apply(params, &tmp);
880
881 if (!migrate_params_check(&tmp, errp)) {
882 /* Invalid parameter */
883 return;
884 }
885
886 migrate_params_apply(params);
887 }
888
889
890 void qmp_migrate_start_postcopy(Error **errp)
891 {
892 MigrationState *s = migrate_get_current();
893
894 if (!migrate_postcopy_ram()) {
895 error_setg(errp, "Enable postcopy with migrate_set_capability before"
896 " the start of migration");
897 return;
898 }
899
900 if (s->state == MIGRATION_STATUS_NONE) {
901 error_setg(errp, "Postcopy must be started after migration has been"
902 " started");
903 return;
904 }
905 /*
906 * we don't error if migration has finished since that would be racy
907 * with issuing this command.
908 */
909 atomic_set(&s->start_postcopy, true);
910 }
911
912 /* shared migration helpers */
913
914 void migrate_set_state(int *state, int old_state, int new_state)
915 {
916 if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
917 trace_migrate_set_state(new_state);
918 migrate_generate_event(new_state);
919 }
920 }
921
922 static MigrationCapabilityStatusList *migrate_cap_add(
923 MigrationCapabilityStatusList *list,
924 MigrationCapability index,
925 bool state)
926 {
927 MigrationCapabilityStatusList *cap;
928
929 cap = g_new0(MigrationCapabilityStatusList, 1);
930 cap->value = g_new0(MigrationCapabilityStatus, 1);
931 cap->value->capability = index;
932 cap->value->state = state;
933 cap->next = list;
934
935 return cap;
936 }
937
938 void migrate_set_block_enabled(bool value, Error **errp)
939 {
940 MigrationCapabilityStatusList *cap;
941
942 cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value);
943 qmp_migrate_set_capabilities(cap, errp);
944 qapi_free_MigrationCapabilityStatusList(cap);
945 }
946
947 static void migrate_set_block_incremental(MigrationState *s, bool value)
948 {
949 s->parameters.block_incremental = value;
950 }
951
952 static void block_cleanup_parameters(MigrationState *s)
953 {
954 if (s->must_remove_block_options) {
955 /* setting to false can never fail */
956 migrate_set_block_enabled(false, &error_abort);
957 migrate_set_block_incremental(s, false);
958 s->must_remove_block_options = false;
959 }
960 }
961
962 static void migrate_fd_cleanup(void *opaque)
963 {
964 MigrationState *s = opaque;
965
966 qemu_bh_delete(s->cleanup_bh);
967 s->cleanup_bh = NULL;
968
969 if (s->to_dst_file) {
970 trace_migrate_fd_cleanup();
971 qemu_mutex_unlock_iothread();
972 if (s->migration_thread_running) {
973 qemu_thread_join(&s->thread);
974 s->migration_thread_running = false;
975 }
976 qemu_mutex_lock_iothread();
977
978 qemu_fclose(s->to_dst_file);
979 s->to_dst_file = NULL;
980 }
981
982 assert((s->state != MIGRATION_STATUS_ACTIVE) &&
983 (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE));
984
985 if (s->state == MIGRATION_STATUS_CANCELLING) {
986 migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING,
987 MIGRATION_STATUS_CANCELLED);
988 }
989
990 notifier_list_notify(&migration_state_notifiers, s);
991 block_cleanup_parameters(s);
992 }
993
994 void migrate_fd_error(MigrationState *s, const Error *error)
995 {
996 trace_migrate_fd_error(error_get_pretty(error));
997 assert(s->to_dst_file == NULL);
998 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
999 MIGRATION_STATUS_FAILED);
1000 if (!s->error) {
1001 s->error = error_copy(error);
1002 }
1003 notifier_list_notify(&migration_state_notifiers, s);
1004 block_cleanup_parameters(s);
1005 }
1006
1007 static void migrate_fd_cancel(MigrationState *s)
1008 {
1009 int old_state ;
1010 QEMUFile *f = migrate_get_current()->to_dst_file;
1011 trace_migrate_fd_cancel();
1012
1013 if (s->rp_state.from_dst_file) {
1014 /* shutdown the rp socket, so causing the rp thread to shutdown */
1015 qemu_file_shutdown(s->rp_state.from_dst_file);
1016 }
1017
1018 do {
1019 old_state = s->state;
1020 if (!migration_is_setup_or_active(old_state)) {
1021 break;
1022 }
1023 migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
1024 } while (s->state != MIGRATION_STATUS_CANCELLING);
1025
1026 /*
1027 * If we're unlucky the migration code might be stuck somewhere in a
1028 * send/write while the network has failed and is waiting to timeout;
1029 * if we've got shutdown(2) available then we can force it to quit.
1030 * The outgoing qemu file gets closed in migrate_fd_cleanup that is
1031 * called in a bh, so there is no race against this cancel.
1032 */
1033 if (s->state == MIGRATION_STATUS_CANCELLING && f) {
1034 qemu_file_shutdown(f);
1035 }
1036 if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) {
1037 Error *local_err = NULL;
1038
1039 bdrv_invalidate_cache_all(&local_err);
1040 if (local_err) {
1041 error_report_err(local_err);
1042 } else {
1043 s->block_inactive = false;
1044 }
1045 }
1046 block_cleanup_parameters(s);
1047 }
1048
1049 void add_migration_state_change_notifier(Notifier *notify)
1050 {
1051 notifier_list_add(&migration_state_notifiers, notify);
1052 }
1053
1054 void remove_migration_state_change_notifier(Notifier *notify)
1055 {
1056 notifier_remove(notify);
1057 }
1058
1059 bool migration_in_setup(MigrationState *s)
1060 {
1061 return s->state == MIGRATION_STATUS_SETUP;
1062 }
1063
1064 bool migration_has_finished(MigrationState *s)
1065 {
1066 return s->state == MIGRATION_STATUS_COMPLETED;
1067 }
1068
1069 bool migration_has_failed(MigrationState *s)
1070 {
1071 return (s->state == MIGRATION_STATUS_CANCELLED ||
1072 s->state == MIGRATION_STATUS_FAILED);
1073 }
1074
1075 bool migration_in_postcopy(void)
1076 {
1077 MigrationState *s = migrate_get_current();
1078
1079 return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
1080 }
1081
1082 bool migration_in_postcopy_after_devices(MigrationState *s)
1083 {
1084 return migration_in_postcopy() && s->postcopy_after_devices;
1085 }
1086
1087 bool migration_is_idle(void)
1088 {
1089 MigrationState *s = migrate_get_current();
1090
1091 switch (s->state) {
1092 case MIGRATION_STATUS_NONE:
1093 case MIGRATION_STATUS_CANCELLED:
1094 case MIGRATION_STATUS_COMPLETED:
1095 case MIGRATION_STATUS_FAILED:
1096 return true;
1097 case MIGRATION_STATUS_SETUP:
1098 case MIGRATION_STATUS_CANCELLING:
1099 case MIGRATION_STATUS_ACTIVE:
1100 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
1101 case MIGRATION_STATUS_COLO:
1102 return false;
1103 case MIGRATION_STATUS__MAX:
1104 g_assert_not_reached();
1105 }
1106
1107 return false;
1108 }
1109
1110 MigrationState *migrate_init(void)
1111 {
1112 MigrationState *s = migrate_get_current();
1113
1114 /*
1115 * Reinitialise all migration state, except
1116 * parameters/capabilities that the user set, and
1117 * locks.
1118 */
1119 s->bytes_xfer = 0;
1120 s->xfer_limit = 0;
1121 s->cleanup_bh = 0;
1122 s->to_dst_file = NULL;
1123 s->state = MIGRATION_STATUS_NONE;
1124 s->rp_state.from_dst_file = NULL;
1125 s->rp_state.error = false;
1126 s->mbps = 0.0;
1127 s->downtime = 0;
1128 s->expected_downtime = 0;
1129 s->setup_time = 0;
1130 s->start_postcopy = false;
1131 s->postcopy_after_devices = false;
1132 s->migration_thread_running = false;
1133 error_free(s->error);
1134 s->error = NULL;
1135
1136 migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
1137
1138 s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
1139 return s;
1140 }
1141
1142 static GSList *migration_blockers;
1143
1144 int migrate_add_blocker(Error *reason, Error **errp)
1145 {
1146 if (migrate_get_current()->only_migratable) {
1147 error_propagate(errp, error_copy(reason));
1148 error_prepend(errp, "disallowing migration blocker "
1149 "(--only_migratable) for: ");
1150 return -EACCES;
1151 }
1152
1153 if (migration_is_idle()) {
1154 migration_blockers = g_slist_prepend(migration_blockers, reason);
1155 return 0;
1156 }
1157
1158 error_propagate(errp, error_copy(reason));
1159 error_prepend(errp, "disallowing migration blocker (migration in "
1160 "progress) for: ");
1161 return -EBUSY;
1162 }
1163
1164 void migrate_del_blocker(Error *reason)
1165 {
1166 migration_blockers = g_slist_remove(migration_blockers, reason);
1167 }
1168
1169 void qmp_migrate_incoming(const char *uri, Error **errp)
1170 {
1171 Error *local_err = NULL;
1172 static bool once = true;
1173
1174 if (!deferred_incoming) {
1175 error_setg(errp, "For use with '-incoming defer'");
1176 return;
1177 }
1178 if (!once) {
1179 error_setg(errp, "The incoming migration has already been started");
1180 }
1181
1182 qemu_start_incoming_migration(uri, &local_err);
1183
1184 if (local_err) {
1185 error_propagate(errp, local_err);
1186 return;
1187 }
1188
1189 once = false;
1190 }
1191
1192 bool migration_is_blocked(Error **errp)
1193 {
1194 if (qemu_savevm_state_blocked(errp)) {
1195 return true;
1196 }
1197
1198 if (migration_blockers) {
1199 error_propagate(errp, error_copy(migration_blockers->data));
1200 return true;
1201 }
1202
1203 return false;
1204 }
1205
1206 void qmp_migrate(const char *uri, bool has_blk, bool blk,
1207 bool has_inc, bool inc, bool has_detach, bool detach,
1208 Error **errp)
1209 {
1210 Error *local_err = NULL;
1211 MigrationState *s = migrate_get_current();
1212 const char *p;
1213
1214 if (migration_is_setup_or_active(s->state) ||
1215 s->state == MIGRATION_STATUS_CANCELLING ||
1216 s->state == MIGRATION_STATUS_COLO) {
1217 error_setg(errp, QERR_MIGRATION_ACTIVE);
1218 return;
1219 }
1220 if (runstate_check(RUN_STATE_INMIGRATE)) {
1221 error_setg(errp, "Guest is waiting for an incoming migration");
1222 return;
1223 }
1224
1225 if (migration_is_blocked(errp)) {
1226 return;
1227 }
1228
1229 if ((has_blk && blk) || (has_inc && inc)) {
1230 if (migrate_use_block() || migrate_use_block_incremental()) {
1231 error_setg(errp, "Command options are incompatible with "
1232 "current migration capabilities");
1233 return;
1234 }
1235 migrate_set_block_enabled(true, &local_err);
1236 if (local_err) {
1237 error_propagate(errp, local_err);
1238 return;
1239 }
1240 s->must_remove_block_options = true;
1241 }
1242
1243 if (has_inc && inc) {
1244 migrate_set_block_incremental(s, true);
1245 }
1246
1247 s = migrate_init();
1248
1249 if (strstart(uri, "tcp:", &p)) {
1250 tcp_start_outgoing_migration(s, p, &local_err);
1251 #ifdef CONFIG_RDMA
1252 } else if (strstart(uri, "rdma:", &p)) {
1253 rdma_start_outgoing_migration(s, p, &local_err);
1254 #endif
1255 } else if (strstart(uri, "exec:", &p)) {
1256 exec_start_outgoing_migration(s, p, &local_err);
1257 } else if (strstart(uri, "unix:", &p)) {
1258 unix_start_outgoing_migration(s, p, &local_err);
1259 } else if (strstart(uri, "fd:", &p)) {
1260 fd_start_outgoing_migration(s, p, &local_err);
1261 } else {
1262 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
1263 "a valid migration protocol");
1264 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1265 MIGRATION_STATUS_FAILED);
1266 return;
1267 }
1268
1269 if (local_err) {
1270 migrate_fd_error(s, local_err);
1271 error_propagate(errp, local_err);
1272 return;
1273 }
1274 }
1275
1276 void qmp_migrate_cancel(Error **errp)
1277 {
1278 migrate_fd_cancel(migrate_get_current());
1279 }
1280
1281 void qmp_migrate_set_cache_size(int64_t value, Error **errp)
1282 {
1283 MigrationState *s = migrate_get_current();
1284 int64_t new_size;
1285
1286 /* Check for truncation */
1287 if (value != (size_t)value) {
1288 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
1289 "exceeding address space");
1290 return;
1291 }
1292
1293 /* Cache should not be larger than guest ram size */
1294 if (value > ram_bytes_total()) {
1295 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
1296 "exceeds guest ram size ");
1297 return;
1298 }
1299
1300 new_size = xbzrle_cache_resize(value);
1301 if (new_size < 0) {
1302 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
1303 "is smaller than page size");
1304 return;
1305 }
1306
1307 s->xbzrle_cache_size = new_size;
1308 }
1309
1310 int64_t qmp_query_migrate_cache_size(Error **errp)
1311 {
1312 return migrate_xbzrle_cache_size();
1313 }
1314
1315 void qmp_migrate_set_speed(int64_t value, Error **errp)
1316 {
1317 MigrateSetParameters p = {
1318 .has_max_bandwidth = true,
1319 .max_bandwidth = value,
1320 };
1321
1322 qmp_migrate_set_parameters(&p, errp);
1323 }
1324
1325 void qmp_migrate_set_downtime(double value, Error **errp)
1326 {
1327 if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) {
1328 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
1329 "the range of 0 to %d seconds",
1330 MAX_MIGRATE_DOWNTIME_SECONDS);
1331 return;
1332 }
1333
1334 value *= 1000; /* Convert to milliseconds */
1335 value = MAX(0, MIN(INT64_MAX, value));
1336
1337 MigrateSetParameters p = {
1338 .has_downtime_limit = true,
1339 .downtime_limit = value,
1340 };
1341
1342 qmp_migrate_set_parameters(&p, errp);
1343 }
1344
1345 bool migrate_release_ram(void)
1346 {
1347 MigrationState *s;
1348
1349 s = migrate_get_current();
1350
1351 return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
1352 }
1353
1354 bool migrate_postcopy_ram(void)
1355 {
1356 MigrationState *s;
1357
1358 s = migrate_get_current();
1359
1360 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
1361 }
1362
1363 bool migrate_auto_converge(void)
1364 {
1365 MigrationState *s;
1366
1367 s = migrate_get_current();
1368
1369 return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
1370 }
1371
1372 bool migrate_zero_blocks(void)
1373 {
1374 MigrationState *s;
1375
1376 s = migrate_get_current();
1377
1378 return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
1379 }
1380
1381 bool migrate_use_compression(void)
1382 {
1383 MigrationState *s;
1384
1385 s = migrate_get_current();
1386
1387 return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
1388 }
1389
1390 int migrate_compress_level(void)
1391 {
1392 MigrationState *s;
1393
1394 s = migrate_get_current();
1395
1396 return s->parameters.compress_level;
1397 }
1398
1399 int migrate_compress_threads(void)
1400 {
1401 MigrationState *s;
1402
1403 s = migrate_get_current();
1404
1405 return s->parameters.compress_threads;
1406 }
1407
1408 int migrate_decompress_threads(void)
1409 {
1410 MigrationState *s;
1411
1412 s = migrate_get_current();
1413
1414 return s->parameters.decompress_threads;
1415 }
1416
1417 bool migrate_use_events(void)
1418 {
1419 MigrationState *s;
1420
1421 s = migrate_get_current();
1422
1423 return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
1424 }
1425
1426 int migrate_use_xbzrle(void)
1427 {
1428 MigrationState *s;
1429
1430 s = migrate_get_current();
1431
1432 return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
1433 }
1434
1435 int64_t migrate_xbzrle_cache_size(void)
1436 {
1437 MigrationState *s;
1438
1439 s = migrate_get_current();
1440
1441 return s->xbzrle_cache_size;
1442 }
1443
1444 bool migrate_use_block(void)
1445 {
1446 MigrationState *s;
1447
1448 s = migrate_get_current();
1449
1450 return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK];
1451 }
1452
1453 bool migrate_use_return_path(void)
1454 {
1455 MigrationState *s;
1456
1457 s = migrate_get_current();
1458
1459 return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
1460 }
1461
1462 bool migrate_use_block_incremental(void)
1463 {
1464 MigrationState *s;
1465
1466 s = migrate_get_current();
1467
1468 return s->parameters.block_incremental;
1469 }
1470
1471 /* migration thread support */
1472 /*
1473 * Something bad happened to the RP stream, mark an error
1474 * The caller shall print or trace something to indicate why
1475 */
1476 static void mark_source_rp_bad(MigrationState *s)
1477 {
1478 s->rp_state.error = true;
1479 }
1480
1481 static struct rp_cmd_args {
1482 ssize_t len; /* -1 = variable */
1483 const char *name;
1484 } rp_cmd_args[] = {
1485 [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" },
1486 [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" },
1487 [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" },
1488 [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" },
1489 [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" },
1490 [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" },
1491 };
1492
1493 /*
1494 * Process a request for pages received on the return path,
1495 * We're allowed to send more than requested (e.g. to round to our page size)
1496 * and we don't need to send pages that have already been sent.
1497 */
1498 static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
1499 ram_addr_t start, size_t len)
1500 {
1501 long our_host_ps = getpagesize();
1502
1503 trace_migrate_handle_rp_req_pages(rbname, start, len);
1504
1505 /*
1506 * Since we currently insist on matching page sizes, just sanity check
1507 * we're being asked for whole host pages.
1508 */
1509 if (start & (our_host_ps-1) ||
1510 (len & (our_host_ps-1))) {
1511 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
1512 " len: %zd", __func__, start, len);
1513 mark_source_rp_bad(ms);
1514 return;
1515 }
1516
1517 if (ram_save_queue_pages(rbname, start, len)) {
1518 mark_source_rp_bad(ms);
1519 }
1520 }
1521
1522 /*
1523 * Handles messages sent on the return path towards the source VM
1524 *
1525 */
1526 static void *source_return_path_thread(void *opaque)
1527 {
1528 MigrationState *ms = opaque;
1529 QEMUFile *rp = ms->rp_state.from_dst_file;
1530 uint16_t header_len, header_type;
1531 uint8_t buf[512];
1532 uint32_t tmp32, sibling_error;
1533 ram_addr_t start = 0; /* =0 to silence warning */
1534 size_t len = 0, expected_len;
1535 int res;
1536
1537 trace_source_return_path_thread_entry();
1538 while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
1539 migration_is_setup_or_active(ms->state)) {
1540 trace_source_return_path_thread_loop_top();
1541 header_type = qemu_get_be16(rp);
1542 header_len = qemu_get_be16(rp);
1543
1544 if (header_type >= MIG_RP_MSG_MAX ||
1545 header_type == MIG_RP_MSG_INVALID) {
1546 error_report("RP: Received invalid message 0x%04x length 0x%04x",
1547 header_type, header_len);
1548 mark_source_rp_bad(ms);
1549 goto out;
1550 }
1551
1552 if ((rp_cmd_args[header_type].len != -1 &&
1553 header_len != rp_cmd_args[header_type].len) ||
1554 header_len > sizeof(buf)) {
1555 error_report("RP: Received '%s' message (0x%04x) with"
1556 "incorrect length %d expecting %zu",
1557 rp_cmd_args[header_type].name, header_type, header_len,
1558 (size_t)rp_cmd_args[header_type].len);
1559 mark_source_rp_bad(ms);
1560 goto out;
1561 }
1562
1563 /* We know we've got a valid header by this point */
1564 res = qemu_get_buffer(rp, buf, header_len);
1565 if (res != header_len) {
1566 error_report("RP: Failed reading data for message 0x%04x"
1567 " read %d expected %d",
1568 header_type, res, header_len);
1569 mark_source_rp_bad(ms);
1570 goto out;
1571 }
1572
1573 /* OK, we have the message and the data */
1574 switch (header_type) {
1575 case MIG_RP_MSG_SHUT:
1576 sibling_error = ldl_be_p(buf);
1577 trace_source_return_path_thread_shut(sibling_error);
1578 if (sibling_error) {
1579 error_report("RP: Sibling indicated error %d", sibling_error);
1580 mark_source_rp_bad(ms);
1581 }
1582 /*
1583 * We'll let the main thread deal with closing the RP
1584 * we could do a shutdown(2) on it, but we're the only user
1585 * anyway, so there's nothing gained.
1586 */
1587 goto out;
1588
1589 case MIG_RP_MSG_PONG:
1590 tmp32 = ldl_be_p(buf);
1591 trace_source_return_path_thread_pong(tmp32);
1592 break;
1593
1594 case MIG_RP_MSG_REQ_PAGES:
1595 start = ldq_be_p(buf);
1596 len = ldl_be_p(buf + 8);
1597 migrate_handle_rp_req_pages(ms, NULL, start, len);
1598 break;
1599
1600 case MIG_RP_MSG_REQ_PAGES_ID:
1601 expected_len = 12 + 1; /* header + termination */
1602
1603 if (header_len >= expected_len) {
1604 start = ldq_be_p(buf);
1605 len = ldl_be_p(buf + 8);
1606 /* Now we expect an idstr */
1607 tmp32 = buf[12]; /* Length of the following idstr */
1608 buf[13 + tmp32] = '\0';
1609 expected_len += tmp32;
1610 }
1611 if (header_len != expected_len) {
1612 error_report("RP: Req_Page_id with length %d expecting %zd",
1613 header_len, expected_len);
1614 mark_source_rp_bad(ms);
1615 goto out;
1616 }
1617 migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len);
1618 break;
1619
1620 default:
1621 break;
1622 }
1623 }
1624 if (qemu_file_get_error(rp)) {
1625 trace_source_return_path_thread_bad_end();
1626 mark_source_rp_bad(ms);
1627 }
1628
1629 trace_source_return_path_thread_end();
1630 out:
1631 ms->rp_state.from_dst_file = NULL;
1632 qemu_fclose(rp);
1633 return NULL;
1634 }
1635
1636 static int open_return_path_on_source(MigrationState *ms)
1637 {
1638
1639 ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file);
1640 if (!ms->rp_state.from_dst_file) {
1641 return -1;
1642 }
1643
1644 trace_open_return_path_on_source();
1645 qemu_thread_create(&ms->rp_state.rp_thread, "return path",
1646 source_return_path_thread, ms, QEMU_THREAD_JOINABLE);
1647
1648 trace_open_return_path_on_source_continue();
1649
1650 return 0;
1651 }
1652
1653 /* Returns 0 if the RP was ok, otherwise there was an error on the RP */
1654 static int await_return_path_close_on_source(MigrationState *ms)
1655 {
1656 /*
1657 * If this is a normal exit then the destination will send a SHUT and the
1658 * rp_thread will exit, however if there's an error we need to cause
1659 * it to exit.
1660 */
1661 if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) {
1662 /*
1663 * shutdown(2), if we have it, will cause it to unblock if it's stuck
1664 * waiting for the destination.
1665 */
1666 qemu_file_shutdown(ms->rp_state.from_dst_file);
1667 mark_source_rp_bad(ms);
1668 }
1669 trace_await_return_path_close_on_source_joining();
1670 qemu_thread_join(&ms->rp_state.rp_thread);
1671 trace_await_return_path_close_on_source_close();
1672 return ms->rp_state.error;
1673 }
1674
1675 /*
1676 * Switch from normal iteration to postcopy
1677 * Returns non-0 on error
1678 */
1679 static int postcopy_start(MigrationState *ms, bool *old_vm_running)
1680 {
1681 int ret;
1682 QIOChannelBuffer *bioc;
1683 QEMUFile *fb;
1684 int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
1685 bool restart_block = false;
1686 migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
1687 MIGRATION_STATUS_POSTCOPY_ACTIVE);
1688
1689 trace_postcopy_start();
1690 qemu_mutex_lock_iothread();
1691 trace_postcopy_start_set_run();
1692
1693 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
1694 *old_vm_running = runstate_is_running();
1695 global_state_store();
1696 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
1697 if (ret < 0) {
1698 goto fail;
1699 }
1700
1701 ret = bdrv_inactivate_all();
1702 if (ret < 0) {
1703 goto fail;
1704 }
1705 restart_block = true;
1706
1707 /*
1708 * Cause any non-postcopiable, but iterative devices to
1709 * send out their final data.
1710 */
1711 qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false);
1712
1713 /*
1714 * in Finish migrate and with the io-lock held everything should
1715 * be quiet, but we've potentially still got dirty pages and we
1716 * need to tell the destination to throw any pages it's already received
1717 * that are dirty
1718 */
1719 if (ram_postcopy_send_discard_bitmap(ms)) {
1720 error_report("postcopy send discard bitmap failed");
1721 goto fail;
1722 }
1723
1724 /*
1725 * send rest of state - note things that are doing postcopy
1726 * will notice we're in POSTCOPY_ACTIVE and not actually
1727 * wrap their state up here
1728 */
1729 qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
1730 /* Ping just for debugging, helps line traces up */
1731 qemu_savevm_send_ping(ms->to_dst_file, 2);
1732
1733 /*
1734 * While loading the device state we may trigger page transfer
1735 * requests and the fd must be free to process those, and thus
1736 * the destination must read the whole device state off the fd before
1737 * it starts processing it. Unfortunately the ad-hoc migration format
1738 * doesn't allow the destination to know the size to read without fully
1739 * parsing it through each devices load-state code (especially the open
1740 * coded devices that use get/put).
1741 * So we wrap the device state up in a package with a length at the start;
1742 * to do this we use a qemu_buf to hold the whole of the device state.
1743 */
1744 bioc = qio_channel_buffer_new(4096);
1745 qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer");
1746 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
1747 object_unref(OBJECT(bioc));
1748
1749 /*
1750 * Make sure the receiver can get incoming pages before we send the rest
1751 * of the state
1752 */
1753 qemu_savevm_send_postcopy_listen(fb);
1754
1755 qemu_savevm_state_complete_precopy(fb, false, false);
1756 qemu_savevm_send_ping(fb, 3);
1757
1758 qemu_savevm_send_postcopy_run(fb);
1759
1760 /* <><> end of stuff going into the package */
1761
1762 /* Last point of recovery; as soon as we send the package the destination
1763 * can open devices and potentially start running.
1764 * Lets just check again we've not got any errors.
1765 */
1766 ret = qemu_file_get_error(ms->to_dst_file);
1767 if (ret) {
1768 error_report("postcopy_start: Migration stream errored (pre package)");
1769 goto fail_closefb;
1770 }
1771
1772 restart_block = false;
1773
1774 /* Now send that blob */
1775 if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) {
1776 goto fail_closefb;
1777 }
1778 qemu_fclose(fb);
1779
1780 /* Send a notify to give a chance for anything that needs to happen
1781 * at the transition to postcopy and after the device state; in particular
1782 * spice needs to trigger a transition now
1783 */
1784 ms->postcopy_after_devices = true;
1785 notifier_list_notify(&migration_state_notifiers, ms);
1786
1787 ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop;
1788
1789 qemu_mutex_unlock_iothread();
1790
1791 /*
1792 * Although this ping is just for debug, it could potentially be
1793 * used for getting a better measurement of downtime at the source.
1794 */
1795 qemu_savevm_send_ping(ms->to_dst_file, 4);
1796
1797 if (migrate_release_ram()) {
1798 ram_postcopy_migrated_memory_release(ms);
1799 }
1800
1801 ret = qemu_file_get_error(ms->to_dst_file);
1802 if (ret) {
1803 error_report("postcopy_start: Migration stream errored");
1804 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
1805 MIGRATION_STATUS_FAILED);
1806 }
1807
1808 return ret;
1809
1810 fail_closefb:
1811 qemu_fclose(fb);
1812 fail:
1813 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
1814 MIGRATION_STATUS_FAILED);
1815 if (restart_block) {
1816 /* A failure happened early enough that we know the destination hasn't
1817 * accessed block devices, so we're safe to recover.
1818 */
1819 Error *local_err = NULL;
1820
1821 bdrv_invalidate_cache_all(&local_err);
1822 if (local_err) {
1823 error_report_err(local_err);
1824 }
1825 }
1826 qemu_mutex_unlock_iothread();
1827 return -1;
1828 }
1829
1830 /**
1831 * migration_completion: Used by migration_thread when there's not much left.
1832 * The caller 'breaks' the loop when this returns.
1833 *
1834 * @s: Current migration state
1835 * @current_active_state: The migration state we expect to be in
1836 * @*old_vm_running: Pointer to old_vm_running flag
1837 * @*start_time: Pointer to time to update
1838 */
1839 static void migration_completion(MigrationState *s, int current_active_state,
1840 bool *old_vm_running,
1841 int64_t *start_time)
1842 {
1843 int ret;
1844
1845 if (s->state == MIGRATION_STATUS_ACTIVE) {
1846 qemu_mutex_lock_iothread();
1847 *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
1848 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
1849 *old_vm_running = runstate_is_running();
1850 ret = global_state_store();
1851
1852 if (!ret) {
1853 bool inactivate = !migrate_colo_enabled();
1854 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
1855 if (ret >= 0) {
1856 qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
1857 ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
1858 inactivate);
1859 }
1860 if (inactivate && ret >= 0) {
1861 s->block_inactive = true;
1862 }
1863 }
1864 qemu_mutex_unlock_iothread();
1865
1866 if (ret < 0) {
1867 goto fail;
1868 }
1869 } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
1870 trace_migration_completion_postcopy_end();
1871
1872 qemu_savevm_state_complete_postcopy(s->to_dst_file);
1873 trace_migration_completion_postcopy_end_after_complete();
1874 }
1875
1876 /*
1877 * If rp was opened we must clean up the thread before
1878 * cleaning everything else up (since if there are no failures
1879 * it will wait for the destination to send it's status in
1880 * a SHUT command).
1881 */
1882 if (s->rp_state.from_dst_file) {
1883 int rp_error;
1884 trace_migration_return_path_end_before();
1885 rp_error = await_return_path_close_on_source(s);
1886 trace_migration_return_path_end_after(rp_error);
1887 if (rp_error) {
1888 goto fail_invalidate;
1889 }
1890 }
1891
1892 if (qemu_file_get_error(s->to_dst_file)) {
1893 trace_migration_completion_file_err();
1894 goto fail_invalidate;
1895 }
1896
1897 if (!migrate_colo_enabled()) {
1898 migrate_set_state(&s->state, current_active_state,
1899 MIGRATION_STATUS_COMPLETED);
1900 }
1901
1902 return;
1903
1904 fail_invalidate:
1905 /* If not doing postcopy, vm_start() will be called: let's regain
1906 * control on images.
1907 */
1908 if (s->state == MIGRATION_STATUS_ACTIVE) {
1909 Error *local_err = NULL;
1910
1911 qemu_mutex_lock_iothread();
1912 bdrv_invalidate_cache_all(&local_err);
1913 if (local_err) {
1914 error_report_err(local_err);
1915 } else {
1916 s->block_inactive = false;
1917 }
1918 qemu_mutex_unlock_iothread();
1919 }
1920
1921 fail:
1922 migrate_set_state(&s->state, current_active_state,
1923 MIGRATION_STATUS_FAILED);
1924 }
1925
1926 bool migrate_colo_enabled(void)
1927 {
1928 MigrationState *s = migrate_get_current();
1929 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO];
1930 }
1931
1932 /*
1933 * Master migration thread on the source VM.
1934 * It drives the migration and pumps the data down the outgoing channel.
1935 */
1936 static void *migration_thread(void *opaque)
1937 {
1938 MigrationState *s = opaque;
1939 /* Used by the bandwidth calcs, updated later */
1940 int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
1941 int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
1942 int64_t initial_bytes = 0;
1943 /*
1944 * The final stage happens when the remaining data is smaller than
1945 * this threshold; it's calculated from the requested downtime and
1946 * measured bandwidth
1947 */
1948 int64_t threshold_size = 0;
1949 int64_t start_time = initial_time;
1950 int64_t end_time;
1951 bool old_vm_running = false;
1952 bool entered_postcopy = false;
1953 /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */
1954 enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE;
1955 bool enable_colo = migrate_colo_enabled();
1956
1957 rcu_register_thread();
1958
1959 qemu_savevm_state_header(s->to_dst_file);
1960
1961 /*
1962 * If we opened the return path, we need to make sure dst has it
1963 * opened as well.
1964 */
1965 if (s->rp_state.from_dst_file) {
1966 /* Now tell the dest that it should open its end so it can reply */
1967 qemu_savevm_send_open_return_path(s->to_dst_file);
1968
1969 /* And do a ping that will make stuff easier to debug */
1970 qemu_savevm_send_ping(s->to_dst_file, 1);
1971 }
1972
1973 if (migrate_postcopy_ram()) {
1974 /*
1975 * Tell the destination that we *might* want to do postcopy later;
1976 * if the other end can't do postcopy it should fail now, nice and
1977 * early.
1978 */
1979 qemu_savevm_send_postcopy_advise(s->to_dst_file);
1980 }
1981
1982 qemu_savevm_state_setup(s->to_dst_file);
1983
1984 s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
1985 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1986 MIGRATION_STATUS_ACTIVE);
1987
1988 trace_migration_thread_setup_complete();
1989
1990 while (s->state == MIGRATION_STATUS_ACTIVE ||
1991 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
1992 int64_t current_time;
1993 uint64_t pending_size;
1994
1995 if (!qemu_file_rate_limit(s->to_dst_file)) {
1996 uint64_t pend_post, pend_nonpost;
1997
1998 qemu_savevm_state_pending(s->to_dst_file, threshold_size,
1999 &pend_nonpost, &pend_post);
2000 pending_size = pend_nonpost + pend_post;
2001 trace_migrate_pending(pending_size, threshold_size,
2002 pend_post, pend_nonpost);
2003 if (pending_size && pending_size >= threshold_size) {
2004 /* Still a significant amount to transfer */
2005
2006 if (migrate_postcopy_ram() &&
2007 s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE &&
2008 pend_nonpost <= threshold_size &&
2009 atomic_read(&s->start_postcopy)) {
2010
2011 if (!postcopy_start(s, &old_vm_running)) {
2012 current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE;
2013 entered_postcopy = true;
2014 }
2015
2016 continue;
2017 }
2018 /* Just another iteration step */
2019 qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy);
2020 } else {
2021 trace_migration_thread_low_pending(pending_size);
2022 migration_completion(s, current_active_state,
2023 &old_vm_running, &start_time);
2024 break;
2025 }
2026 }
2027
2028 if (qemu_file_get_error(s->to_dst_file)) {
2029 migrate_set_state(&s->state, current_active_state,
2030 MIGRATION_STATUS_FAILED);
2031 trace_migration_thread_file_err();
2032 break;
2033 }
2034 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2035 if (current_time >= initial_time + BUFFER_DELAY) {
2036 uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) -
2037 initial_bytes;
2038 uint64_t time_spent = current_time - initial_time;
2039 double bandwidth = (double)transferred_bytes / time_spent;
2040 threshold_size = bandwidth * s->parameters.downtime_limit;
2041
2042 s->mbps = (((double) transferred_bytes * 8.0) /
2043 ((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
2044
2045 trace_migrate_transferred(transferred_bytes, time_spent,
2046 bandwidth, threshold_size);
2047 /* if we haven't sent anything, we don't want to recalculate
2048 10000 is a small enough number for our purposes */
2049 if (ram_counters.dirty_pages_rate && transferred_bytes > 10000) {
2050 s->expected_downtime = ram_counters.dirty_pages_rate *
2051 qemu_target_page_size() / bandwidth;
2052 }
2053
2054 qemu_file_reset_rate_limit(s->to_dst_file);
2055 initial_time = current_time;
2056 initial_bytes = qemu_ftell(s->to_dst_file);
2057 }
2058 if (qemu_file_rate_limit(s->to_dst_file)) {
2059 /* usleep expects microseconds */
2060 g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
2061 }
2062 }
2063
2064 trace_migration_thread_after_loop();
2065 /* If we enabled cpu throttling for auto-converge, turn it off. */
2066 cpu_throttle_stop();
2067 end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2068
2069 qemu_mutex_lock_iothread();
2070 /*
2071 * The resource has been allocated by migration will be reused in COLO
2072 * process, so don't release them.
2073 */
2074 if (!enable_colo) {
2075 qemu_savevm_state_cleanup();
2076 }
2077 if (s->state == MIGRATION_STATUS_COMPLETED) {
2078 uint64_t transferred_bytes = qemu_ftell(s->to_dst_file);
2079 s->total_time = end_time - s->total_time;
2080 if (!entered_postcopy) {
2081 s->downtime = end_time - start_time;
2082 }
2083 if (s->total_time) {
2084 s->mbps = (((double) transferred_bytes * 8.0) /
2085 ((double) s->total_time)) / 1000;
2086 }
2087 runstate_set(RUN_STATE_POSTMIGRATE);
2088 } else {
2089 if (s->state == MIGRATION_STATUS_ACTIVE && enable_colo) {
2090 migrate_start_colo_process(s);
2091 qemu_savevm_state_cleanup();
2092 /*
2093 * Fixme: we will run VM in COLO no matter its old running state.
2094 * After exited COLO, we will keep running.
2095 */
2096 old_vm_running = true;
2097 }
2098 if (old_vm_running && !entered_postcopy) {
2099 vm_start();
2100 } else {
2101 if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
2102 runstate_set(RUN_STATE_POSTMIGRATE);
2103 }
2104 }
2105 }
2106 qemu_bh_schedule(s->cleanup_bh);
2107 qemu_mutex_unlock_iothread();
2108
2109 rcu_unregister_thread();
2110 return NULL;
2111 }
2112
2113 void migrate_fd_connect(MigrationState *s)
2114 {
2115 s->expected_downtime = s->parameters.downtime_limit;
2116 s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
2117
2118 qemu_file_set_blocking(s->to_dst_file, true);
2119 qemu_file_set_rate_limit(s->to_dst_file,
2120 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
2121
2122 /* Notify before starting migration thread */
2123 notifier_list_notify(&migration_state_notifiers, s);
2124
2125 /*
2126 * Open the return path. For postcopy, it is used exclusively. For
2127 * precopy, only if user specified "return-path" capability would
2128 * QEMU uses the return path.
2129 */
2130 if (migrate_postcopy_ram() || migrate_use_return_path()) {
2131 if (open_return_path_on_source(s)) {
2132 error_report("Unable to open return-path for postcopy");
2133 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
2134 MIGRATION_STATUS_FAILED);
2135 migrate_fd_cleanup(s);
2136 return;
2137 }
2138 }
2139
2140 qemu_thread_create(&s->thread, "live_migration", migration_thread, s,
2141 QEMU_THREAD_JOINABLE);
2142 s->migration_thread_running = true;
2143 }
2144
2145 void migration_global_dump(Monitor *mon)
2146 {
2147 MigrationState *ms = migrate_get_current();
2148
2149 monitor_printf(mon, "globals: store-global-state=%d, only_migratable=%d, "
2150 "send-configuration=%d, send-section-footer=%d\n",
2151 ms->store_global_state, ms->only_migratable,
2152 ms->send_configuration, ms->send_section_footer);
2153 }
2154
2155 #define DEFINE_PROP_MIG_CAP(name, x) \
2156 DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
2157
2158 static Property migration_properties[] = {
2159 DEFINE_PROP_BOOL("store-global-state", MigrationState,
2160 store_global_state, true),
2161 DEFINE_PROP_BOOL("only-migratable", MigrationState, only_migratable, false),
2162 DEFINE_PROP_BOOL("send-configuration", MigrationState,
2163 send_configuration, true),
2164 DEFINE_PROP_BOOL("send-section-footer", MigrationState,
2165 send_section_footer, true),
2166
2167 /* Migration parameters */
2168 DEFINE_PROP_INT64("x-compress-level", MigrationState,
2169 parameters.compress_level,
2170 DEFAULT_MIGRATE_COMPRESS_LEVEL),
2171 DEFINE_PROP_INT64("x-compress-threads", MigrationState,
2172 parameters.compress_threads,
2173 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
2174 DEFINE_PROP_INT64("x-decompress-threads", MigrationState,
2175 parameters.decompress_threads,
2176 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
2177 DEFINE_PROP_INT64("x-cpu-throttle-initial", MigrationState,
2178 parameters.cpu_throttle_initial,
2179 DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
2180 DEFINE_PROP_INT64("x-cpu-throttle-increment", MigrationState,
2181 parameters.cpu_throttle_increment,
2182 DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
2183 DEFINE_PROP_INT64("x-max-bandwidth", MigrationState,
2184 parameters.max_bandwidth, MAX_THROTTLE),
2185 DEFINE_PROP_INT64("x-downtime-limit", MigrationState,
2186 parameters.downtime_limit,
2187 DEFAULT_MIGRATE_SET_DOWNTIME),
2188 DEFINE_PROP_INT64("x-checkpoint-delay", MigrationState,
2189 parameters.x_checkpoint_delay,
2190 DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
2191
2192 /* Migration capabilities */
2193 DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
2194 DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
2195 DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
2196 DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
2197 DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
2198 DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
2199 DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
2200 DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
2201 DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
2202 DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
2203 DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
2204
2205 DEFINE_PROP_END_OF_LIST(),
2206 };
2207
2208 static void migration_class_init(ObjectClass *klass, void *data)
2209 {
2210 DeviceClass *dc = DEVICE_CLASS(klass);
2211
2212 dc->user_creatable = false;
2213 dc->props = migration_properties;
2214 }
2215
2216 static void migration_instance_finalize(Object *obj)
2217 {
2218 MigrationState *ms = MIGRATION_OBJ(obj);
2219 MigrationParameters *params = &ms->parameters;
2220
2221 g_free(params->tls_hostname);
2222 g_free(params->tls_creds);
2223 }
2224
2225 static void migration_instance_init(Object *obj)
2226 {
2227 MigrationState *ms = MIGRATION_OBJ(obj);
2228 MigrationParameters *params = &ms->parameters;
2229
2230 ms->state = MIGRATION_STATUS_NONE;
2231 ms->xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE;
2232 ms->mbps = -1;
2233
2234 params->tls_hostname = g_strdup("");
2235 params->tls_creds = g_strdup("");
2236
2237 /* Set has_* up only for parameter checks */
2238 params->has_compress_level = true;
2239 params->has_compress_threads = true;
2240 params->has_decompress_threads = true;
2241 params->has_cpu_throttle_initial = true;
2242 params->has_cpu_throttle_increment = true;
2243 params->has_max_bandwidth = true;
2244 params->has_downtime_limit = true;
2245 params->has_x_checkpoint_delay = true;
2246 params->has_block_incremental = true;
2247 }
2248
2249 /*
2250 * Return true if check pass, false otherwise. Error will be put
2251 * inside errp if provided.
2252 */
2253 static bool migration_object_check(MigrationState *ms, Error **errp)
2254 {
2255 MigrationCapabilityStatusList *head = NULL;
2256 /* Assuming all off */
2257 bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret;
2258 int i;
2259
2260 if (!migrate_params_check(&ms->parameters, errp)) {
2261 return false;
2262 }
2263
2264 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
2265 if (ms->enabled_capabilities[i]) {
2266 head = migrate_cap_add(head, i, true);
2267 }
2268 }
2269
2270 ret = migrate_caps_check(cap_list, head, errp);
2271
2272 /* It works with head == NULL */
2273 qapi_free_MigrationCapabilityStatusList(head);
2274
2275 return ret;
2276 }
2277
2278 static const TypeInfo migration_type = {
2279 .name = TYPE_MIGRATION,
2280 /*
2281 * NOTE: TYPE_MIGRATION is not really a device, as the object is
2282 * not created using qdev_create(), it is not attached to the qdev
2283 * device tree, and it is never realized.
2284 *
2285 * TODO: Make this TYPE_OBJECT once QOM provides something like
2286 * TYPE_DEVICE's "-global" properties.
2287 */
2288 .parent = TYPE_DEVICE,
2289 .class_init = migration_class_init,
2290 .class_size = sizeof(MigrationClass),
2291 .instance_size = sizeof(MigrationState),
2292 .instance_init = migration_instance_init,
2293 .instance_finalize = migration_instance_finalize,
2294 };
2295
2296 static void register_migration_types(void)
2297 {
2298 type_register_static(&migration_type);
2299 }
2300
2301 type_init(register_migration_types);
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