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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-common.h" | |
17 | #include "qemu/main-loop.h" | |
18 | #include "migration/migration.h" | |
19 | #include "monitor/monitor.h" | |
20 | #include "migration/qemu-file.h" | |
21 | #include "sysemu/sysemu.h" | |
22 | #include "block/block.h" | |
23 | #include "qemu/sockets.h" | |
24 | #include "migration/block.h" | |
25 | #include "qemu/thread.h" | |
26 | #include "qmp-commands.h" | |
27 | #include "trace.h" | |
28 | ||
29 | enum { | |
30 | MIG_STATE_ERROR = -1, | |
31 | MIG_STATE_NONE, | |
32 | MIG_STATE_SETUP, | |
33 | MIG_STATE_CANCELLING, | |
34 | MIG_STATE_CANCELLED, | |
35 | MIG_STATE_ACTIVE, | |
36 | MIG_STATE_COMPLETED, | |
37 | }; | |
38 | ||
39 | #define MAX_THROTTLE (32 << 20) /* Migration speed throttling */ | |
40 | ||
41 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled | |
42 | * data. */ | |
43 | #define BUFFER_DELAY 100 | |
44 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
45 | ||
46 | /* Migration XBZRLE default cache size */ | |
47 | #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) | |
48 | ||
49 | static NotifierList migration_state_notifiers = | |
50 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
51 | ||
52 | /* When we add fault tolerance, we could have several | |
53 | migrations at once. For now we don't need to add | |
54 | dynamic creation of migration */ | |
55 | ||
56 | MigrationState *migrate_get_current(void) | |
57 | { | |
58 | static MigrationState current_migration = { | |
59 | .state = MIG_STATE_NONE, | |
60 | .bandwidth_limit = MAX_THROTTLE, | |
61 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, | |
62 | .mbps = -1, | |
63 | }; | |
64 | ||
65 | return ¤t_migration; | |
66 | } | |
67 | ||
68 | void qemu_start_incoming_migration(const char *uri, Error **errp) | |
69 | { | |
70 | const char *p; | |
71 | ||
72 | if (strstart(uri, "tcp:", &p)) | |
73 | tcp_start_incoming_migration(p, errp); | |
74 | #ifdef CONFIG_RDMA | |
75 | else if (strstart(uri, "rdma:", &p)) | |
76 | rdma_start_incoming_migration(p, errp); | |
77 | #endif | |
78 | #if !defined(WIN32) | |
79 | else if (strstart(uri, "exec:", &p)) | |
80 | exec_start_incoming_migration(p, errp); | |
81 | else if (strstart(uri, "unix:", &p)) | |
82 | unix_start_incoming_migration(p, errp); | |
83 | else if (strstart(uri, "fd:", &p)) | |
84 | fd_start_incoming_migration(p, errp); | |
85 | #endif | |
86 | else { | |
87 | error_setg(errp, "unknown migration protocol: %s", uri); | |
88 | } | |
89 | } | |
90 | ||
91 | static void process_incoming_migration_co(void *opaque) | |
92 | { | |
93 | QEMUFile *f = opaque; | |
94 | Error *local_err = NULL; | |
95 | int ret; | |
96 | ||
97 | ret = qemu_loadvm_state(f); | |
98 | qemu_fclose(f); | |
99 | free_xbzrle_decoded_buf(); | |
100 | if (ret < 0) { | |
101 | error_report("load of migration failed: %s", strerror(-ret)); | |
102 | exit(EXIT_FAILURE); | |
103 | } | |
104 | qemu_announce_self(); | |
105 | ||
106 | bdrv_clear_incoming_migration_all(); | |
107 | /* Make sure all file formats flush their mutable metadata */ | |
108 | bdrv_invalidate_cache_all(&local_err); | |
109 | if (local_err) { | |
110 | qerror_report_err(local_err); | |
111 | error_free(local_err); | |
112 | exit(EXIT_FAILURE); | |
113 | } | |
114 | ||
115 | if (autostart) { | |
116 | vm_start(); | |
117 | } else { | |
118 | runstate_set(RUN_STATE_PAUSED); | |
119 | } | |
120 | } | |
121 | ||
122 | void process_incoming_migration(QEMUFile *f) | |
123 | { | |
124 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); | |
125 | int fd = qemu_get_fd(f); | |
126 | ||
127 | assert(fd != -1); | |
128 | qemu_set_nonblock(fd); | |
129 | qemu_coroutine_enter(co, f); | |
130 | } | |
131 | ||
132 | /* amount of nanoseconds we are willing to wait for migration to be down. | |
133 | * the choice of nanoseconds is because it is the maximum resolution that | |
134 | * get_clock() can achieve. It is an internal measure. All user-visible | |
135 | * units must be in seconds */ | |
136 | static uint64_t max_downtime = 300000000; | |
137 | ||
138 | uint64_t migrate_max_downtime(void) | |
139 | { | |
140 | return max_downtime; | |
141 | } | |
142 | ||
143 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) | |
144 | { | |
145 | MigrationCapabilityStatusList *head = NULL; | |
146 | MigrationCapabilityStatusList *caps; | |
147 | MigrationState *s = migrate_get_current(); | |
148 | int i; | |
149 | ||
150 | caps = NULL; /* silence compiler warning */ | |
151 | for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) { | |
152 | if (head == NULL) { | |
153 | head = g_malloc0(sizeof(*caps)); | |
154 | caps = head; | |
155 | } else { | |
156 | caps->next = g_malloc0(sizeof(*caps)); | |
157 | caps = caps->next; | |
158 | } | |
159 | caps->value = | |
160 | g_malloc(sizeof(*caps->value)); | |
161 | caps->value->capability = i; | |
162 | caps->value->state = s->enabled_capabilities[i]; | |
163 | } | |
164 | ||
165 | return head; | |
166 | } | |
167 | ||
168 | static void get_xbzrle_cache_stats(MigrationInfo *info) | |
169 | { | |
170 | if (migrate_use_xbzrle()) { | |
171 | info->has_xbzrle_cache = true; | |
172 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
173 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
174 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
175 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
176 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
177 | info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate(); | |
178 | info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); | |
179 | } | |
180 | } | |
181 | ||
182 | MigrationInfo *qmp_query_migrate(Error **errp) | |
183 | { | |
184 | MigrationInfo *info = g_malloc0(sizeof(*info)); | |
185 | MigrationState *s = migrate_get_current(); | |
186 | ||
187 | switch (s->state) { | |
188 | case MIG_STATE_NONE: | |
189 | /* no migration has happened ever */ | |
190 | break; | |
191 | case MIG_STATE_SETUP: | |
192 | info->has_status = true; | |
193 | info->status = g_strdup("setup"); | |
194 | info->has_total_time = false; | |
195 | break; | |
196 | case MIG_STATE_ACTIVE: | |
197 | case MIG_STATE_CANCELLING: | |
198 | info->has_status = true; | |
199 | info->status = g_strdup("active"); | |
200 | info->has_total_time = true; | |
201 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
202 | - s->total_time; | |
203 | info->has_expected_downtime = true; | |
204 | info->expected_downtime = s->expected_downtime; | |
205 | info->has_setup_time = true; | |
206 | info->setup_time = s->setup_time; | |
207 | ||
208 | info->has_ram = true; | |
209 | info->ram = g_malloc0(sizeof(*info->ram)); | |
210 | info->ram->transferred = ram_bytes_transferred(); | |
211 | info->ram->remaining = ram_bytes_remaining(); | |
212 | info->ram->total = ram_bytes_total(); | |
213 | info->ram->duplicate = dup_mig_pages_transferred(); | |
214 | info->ram->skipped = skipped_mig_pages_transferred(); | |
215 | info->ram->normal = norm_mig_pages_transferred(); | |
216 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
217 | info->ram->dirty_pages_rate = s->dirty_pages_rate; | |
218 | info->ram->mbps = s->mbps; | |
219 | info->ram->dirty_sync_count = s->dirty_sync_count; | |
220 | ||
221 | if (blk_mig_active()) { | |
222 | info->has_disk = true; | |
223 | info->disk = g_malloc0(sizeof(*info->disk)); | |
224 | info->disk->transferred = blk_mig_bytes_transferred(); | |
225 | info->disk->remaining = blk_mig_bytes_remaining(); | |
226 | info->disk->total = blk_mig_bytes_total(); | |
227 | } | |
228 | ||
229 | get_xbzrle_cache_stats(info); | |
230 | break; | |
231 | case MIG_STATE_COMPLETED: | |
232 | get_xbzrle_cache_stats(info); | |
233 | ||
234 | info->has_status = true; | |
235 | info->status = g_strdup("completed"); | |
236 | info->has_total_time = true; | |
237 | info->total_time = s->total_time; | |
238 | info->has_downtime = true; | |
239 | info->downtime = s->downtime; | |
240 | info->has_setup_time = true; | |
241 | info->setup_time = s->setup_time; | |
242 | ||
243 | info->has_ram = true; | |
244 | info->ram = g_malloc0(sizeof(*info->ram)); | |
245 | info->ram->transferred = ram_bytes_transferred(); | |
246 | info->ram->remaining = 0; | |
247 | info->ram->total = ram_bytes_total(); | |
248 | info->ram->duplicate = dup_mig_pages_transferred(); | |
249 | info->ram->skipped = skipped_mig_pages_transferred(); | |
250 | info->ram->normal = norm_mig_pages_transferred(); | |
251 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
252 | info->ram->mbps = s->mbps; | |
253 | info->ram->dirty_sync_count = s->dirty_sync_count; | |
254 | break; | |
255 | case MIG_STATE_ERROR: | |
256 | info->has_status = true; | |
257 | info->status = g_strdup("failed"); | |
258 | break; | |
259 | case MIG_STATE_CANCELLED: | |
260 | info->has_status = true; | |
261 | info->status = g_strdup("cancelled"); | |
262 | break; | |
263 | } | |
264 | ||
265 | return info; | |
266 | } | |
267 | ||
268 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, | |
269 | Error **errp) | |
270 | { | |
271 | MigrationState *s = migrate_get_current(); | |
272 | MigrationCapabilityStatusList *cap; | |
273 | ||
274 | if (s->state == MIG_STATE_ACTIVE || s->state == MIG_STATE_SETUP) { | |
275 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
276 | return; | |
277 | } | |
278 | ||
279 | for (cap = params; cap; cap = cap->next) { | |
280 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
281 | } | |
282 | } | |
283 | ||
284 | /* shared migration helpers */ | |
285 | ||
286 | static void migrate_set_state(MigrationState *s, int old_state, int new_state) | |
287 | { | |
288 | if (atomic_cmpxchg(&s->state, old_state, new_state) == new_state) { | |
289 | trace_migrate_set_state(new_state); | |
290 | } | |
291 | } | |
292 | ||
293 | static void migrate_fd_cleanup(void *opaque) | |
294 | { | |
295 | MigrationState *s = opaque; | |
296 | ||
297 | qemu_bh_delete(s->cleanup_bh); | |
298 | s->cleanup_bh = NULL; | |
299 | ||
300 | if (s->file) { | |
301 | trace_migrate_fd_cleanup(); | |
302 | qemu_mutex_unlock_iothread(); | |
303 | qemu_thread_join(&s->thread); | |
304 | qemu_mutex_lock_iothread(); | |
305 | ||
306 | qemu_fclose(s->file); | |
307 | s->file = NULL; | |
308 | } | |
309 | ||
310 | assert(s->state != MIG_STATE_ACTIVE); | |
311 | ||
312 | if (s->state != MIG_STATE_COMPLETED) { | |
313 | qemu_savevm_state_cancel(); | |
314 | if (s->state == MIG_STATE_CANCELLING) { | |
315 | migrate_set_state(s, MIG_STATE_CANCELLING, MIG_STATE_CANCELLED); | |
316 | } | |
317 | } | |
318 | ||
319 | notifier_list_notify(&migration_state_notifiers, s); | |
320 | } | |
321 | ||
322 | void migrate_fd_error(MigrationState *s) | |
323 | { | |
324 | trace_migrate_fd_error(); | |
325 | assert(s->file == NULL); | |
326 | s->state = MIG_STATE_ERROR; | |
327 | trace_migrate_set_state(MIG_STATE_ERROR); | |
328 | notifier_list_notify(&migration_state_notifiers, s); | |
329 | } | |
330 | ||
331 | static void migrate_fd_cancel(MigrationState *s) | |
332 | { | |
333 | int old_state ; | |
334 | trace_migrate_fd_cancel(); | |
335 | ||
336 | do { | |
337 | old_state = s->state; | |
338 | if (old_state != MIG_STATE_SETUP && old_state != MIG_STATE_ACTIVE) { | |
339 | break; | |
340 | } | |
341 | migrate_set_state(s, old_state, MIG_STATE_CANCELLING); | |
342 | } while (s->state != MIG_STATE_CANCELLING); | |
343 | } | |
344 | ||
345 | void add_migration_state_change_notifier(Notifier *notify) | |
346 | { | |
347 | notifier_list_add(&migration_state_notifiers, notify); | |
348 | } | |
349 | ||
350 | void remove_migration_state_change_notifier(Notifier *notify) | |
351 | { | |
352 | notifier_remove(notify); | |
353 | } | |
354 | ||
355 | bool migration_in_setup(MigrationState *s) | |
356 | { | |
357 | return s->state == MIG_STATE_SETUP; | |
358 | } | |
359 | ||
360 | bool migration_has_finished(MigrationState *s) | |
361 | { | |
362 | return s->state == MIG_STATE_COMPLETED; | |
363 | } | |
364 | ||
365 | bool migration_has_failed(MigrationState *s) | |
366 | { | |
367 | return (s->state == MIG_STATE_CANCELLED || | |
368 | s->state == MIG_STATE_ERROR); | |
369 | } | |
370 | ||
371 | static MigrationState *migrate_init(const MigrationParams *params) | |
372 | { | |
373 | MigrationState *s = migrate_get_current(); | |
374 | int64_t bandwidth_limit = s->bandwidth_limit; | |
375 | bool enabled_capabilities[MIGRATION_CAPABILITY_MAX]; | |
376 | int64_t xbzrle_cache_size = s->xbzrle_cache_size; | |
377 | ||
378 | memcpy(enabled_capabilities, s->enabled_capabilities, | |
379 | sizeof(enabled_capabilities)); | |
380 | ||
381 | memset(s, 0, sizeof(*s)); | |
382 | s->params = *params; | |
383 | memcpy(s->enabled_capabilities, enabled_capabilities, | |
384 | sizeof(enabled_capabilities)); | |
385 | s->xbzrle_cache_size = xbzrle_cache_size; | |
386 | ||
387 | s->bandwidth_limit = bandwidth_limit; | |
388 | s->state = MIG_STATE_SETUP; | |
389 | trace_migrate_set_state(MIG_STATE_SETUP); | |
390 | ||
391 | s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
392 | return s; | |
393 | } | |
394 | ||
395 | static GSList *migration_blockers; | |
396 | ||
397 | void migrate_add_blocker(Error *reason) | |
398 | { | |
399 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
400 | } | |
401 | ||
402 | void migrate_del_blocker(Error *reason) | |
403 | { | |
404 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
405 | } | |
406 | ||
407 | void qmp_migrate(const char *uri, bool has_blk, bool blk, | |
408 | bool has_inc, bool inc, bool has_detach, bool detach, | |
409 | Error **errp) | |
410 | { | |
411 | Error *local_err = NULL; | |
412 | MigrationState *s = migrate_get_current(); | |
413 | MigrationParams params; | |
414 | const char *p; | |
415 | ||
416 | params.blk = has_blk && blk; | |
417 | params.shared = has_inc && inc; | |
418 | ||
419 | if (s->state == MIG_STATE_ACTIVE || s->state == MIG_STATE_SETUP || | |
420 | s->state == MIG_STATE_CANCELLING) { | |
421 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
422 | return; | |
423 | } | |
424 | ||
425 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
426 | error_setg(errp, "Guest is waiting for an incoming migration"); | |
427 | return; | |
428 | } | |
429 | ||
430 | if (qemu_savevm_state_blocked(errp)) { | |
431 | return; | |
432 | } | |
433 | ||
434 | if (migration_blockers) { | |
435 | *errp = error_copy(migration_blockers->data); | |
436 | return; | |
437 | } | |
438 | ||
439 | s = migrate_init(¶ms); | |
440 | ||
441 | if (strstart(uri, "tcp:", &p)) { | |
442 | tcp_start_outgoing_migration(s, p, &local_err); | |
443 | #ifdef CONFIG_RDMA | |
444 | } else if (strstart(uri, "rdma:", &p)) { | |
445 | rdma_start_outgoing_migration(s, p, &local_err); | |
446 | #endif | |
447 | #if !defined(WIN32) | |
448 | } else if (strstart(uri, "exec:", &p)) { | |
449 | exec_start_outgoing_migration(s, p, &local_err); | |
450 | } else if (strstart(uri, "unix:", &p)) { | |
451 | unix_start_outgoing_migration(s, p, &local_err); | |
452 | } else if (strstart(uri, "fd:", &p)) { | |
453 | fd_start_outgoing_migration(s, p, &local_err); | |
454 | #endif | |
455 | } else { | |
456 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol"); | |
457 | s->state = MIG_STATE_ERROR; | |
458 | return; | |
459 | } | |
460 | ||
461 | if (local_err) { | |
462 | migrate_fd_error(s); | |
463 | error_propagate(errp, local_err); | |
464 | return; | |
465 | } | |
466 | } | |
467 | ||
468 | void qmp_migrate_cancel(Error **errp) | |
469 | { | |
470 | migrate_fd_cancel(migrate_get_current()); | |
471 | } | |
472 | ||
473 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) | |
474 | { | |
475 | MigrationState *s = migrate_get_current(); | |
476 | int64_t new_size; | |
477 | ||
478 | /* Check for truncation */ | |
479 | if (value != (size_t)value) { | |
480 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
481 | "exceeding address space"); | |
482 | return; | |
483 | } | |
484 | ||
485 | /* Cache should not be larger than guest ram size */ | |
486 | if (value > ram_bytes_total()) { | |
487 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
488 | "exceeds guest ram size "); | |
489 | return; | |
490 | } | |
491 | ||
492 | new_size = xbzrle_cache_resize(value); | |
493 | if (new_size < 0) { | |
494 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
495 | "is smaller than page size"); | |
496 | return; | |
497 | } | |
498 | ||
499 | s->xbzrle_cache_size = new_size; | |
500 | } | |
501 | ||
502 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
503 | { | |
504 | return migrate_xbzrle_cache_size(); | |
505 | } | |
506 | ||
507 | void qmp_migrate_set_speed(int64_t value, Error **errp) | |
508 | { | |
509 | MigrationState *s; | |
510 | ||
511 | if (value < 0) { | |
512 | value = 0; | |
513 | } | |
514 | if (value > SIZE_MAX) { | |
515 | value = SIZE_MAX; | |
516 | } | |
517 | ||
518 | s = migrate_get_current(); | |
519 | s->bandwidth_limit = value; | |
520 | if (s->file) { | |
521 | qemu_file_set_rate_limit(s->file, s->bandwidth_limit / XFER_LIMIT_RATIO); | |
522 | } | |
523 | } | |
524 | ||
525 | void qmp_migrate_set_downtime(double value, Error **errp) | |
526 | { | |
527 | value *= 1e9; | |
528 | value = MAX(0, MIN(UINT64_MAX, value)); | |
529 | max_downtime = (uint64_t)value; | |
530 | } | |
531 | ||
532 | bool migrate_rdma_pin_all(void) | |
533 | { | |
534 | MigrationState *s; | |
535 | ||
536 | s = migrate_get_current(); | |
537 | ||
538 | return s->enabled_capabilities[MIGRATION_CAPABILITY_RDMA_PIN_ALL]; | |
539 | } | |
540 | ||
541 | bool migrate_auto_converge(void) | |
542 | { | |
543 | MigrationState *s; | |
544 | ||
545 | s = migrate_get_current(); | |
546 | ||
547 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; | |
548 | } | |
549 | ||
550 | bool migrate_zero_blocks(void) | |
551 | { | |
552 | MigrationState *s; | |
553 | ||
554 | s = migrate_get_current(); | |
555 | ||
556 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; | |
557 | } | |
558 | ||
559 | int migrate_use_xbzrle(void) | |
560 | { | |
561 | MigrationState *s; | |
562 | ||
563 | s = migrate_get_current(); | |
564 | ||
565 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
566 | } | |
567 | ||
568 | int64_t migrate_xbzrle_cache_size(void) | |
569 | { | |
570 | MigrationState *s; | |
571 | ||
572 | s = migrate_get_current(); | |
573 | ||
574 | return s->xbzrle_cache_size; | |
575 | } | |
576 | ||
577 | /* migration thread support */ | |
578 | ||
579 | static void *migration_thread(void *opaque) | |
580 | { | |
581 | MigrationState *s = opaque; | |
582 | int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
583 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); | |
584 | int64_t initial_bytes = 0; | |
585 | int64_t max_size = 0; | |
586 | int64_t start_time = initial_time; | |
587 | bool old_vm_running = false; | |
588 | ||
589 | qemu_savevm_state_begin(s->file, &s->params); | |
590 | ||
591 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; | |
592 | migrate_set_state(s, MIG_STATE_SETUP, MIG_STATE_ACTIVE); | |
593 | ||
594 | while (s->state == MIG_STATE_ACTIVE) { | |
595 | int64_t current_time; | |
596 | uint64_t pending_size; | |
597 | ||
598 | if (!qemu_file_rate_limit(s->file)) { | |
599 | pending_size = qemu_savevm_state_pending(s->file, max_size); | |
600 | trace_migrate_pending(pending_size, max_size); | |
601 | if (pending_size && pending_size >= max_size) { | |
602 | qemu_savevm_state_iterate(s->file); | |
603 | } else { | |
604 | int ret; | |
605 | ||
606 | qemu_mutex_lock_iothread(); | |
607 | start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
608 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
609 | old_vm_running = runstate_is_running(); | |
610 | ||
611 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
612 | if (ret >= 0) { | |
613 | qemu_file_set_rate_limit(s->file, INT64_MAX); | |
614 | qemu_savevm_state_complete(s->file); | |
615 | } | |
616 | qemu_mutex_unlock_iothread(); | |
617 | ||
618 | if (ret < 0) { | |
619 | migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR); | |
620 | break; | |
621 | } | |
622 | ||
623 | if (!qemu_file_get_error(s->file)) { | |
624 | migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_COMPLETED); | |
625 | break; | |
626 | } | |
627 | } | |
628 | } | |
629 | ||
630 | if (qemu_file_get_error(s->file)) { | |
631 | migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR); | |
632 | break; | |
633 | } | |
634 | current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
635 | if (current_time >= initial_time + BUFFER_DELAY) { | |
636 | uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes; | |
637 | uint64_t time_spent = current_time - initial_time; | |
638 | double bandwidth = transferred_bytes / time_spent; | |
639 | max_size = bandwidth * migrate_max_downtime() / 1000000; | |
640 | ||
641 | s->mbps = time_spent ? (((double) transferred_bytes * 8.0) / | |
642 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0 : -1; | |
643 | ||
644 | trace_migrate_transferred(transferred_bytes, time_spent, | |
645 | bandwidth, max_size); | |
646 | /* if we haven't sent anything, we don't want to recalculate | |
647 | 10000 is a small enough number for our purposes */ | |
648 | if (s->dirty_bytes_rate && transferred_bytes > 10000) { | |
649 | s->expected_downtime = s->dirty_bytes_rate / bandwidth; | |
650 | } | |
651 | ||
652 | qemu_file_reset_rate_limit(s->file); | |
653 | initial_time = current_time; | |
654 | initial_bytes = qemu_ftell(s->file); | |
655 | } | |
656 | if (qemu_file_rate_limit(s->file)) { | |
657 | /* usleep expects microseconds */ | |
658 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
659 | } | |
660 | } | |
661 | ||
662 | qemu_mutex_lock_iothread(); | |
663 | if (s->state == MIG_STATE_COMPLETED) { | |
664 | int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
665 | uint64_t transferred_bytes = qemu_ftell(s->file); | |
666 | s->total_time = end_time - s->total_time; | |
667 | s->downtime = end_time - start_time; | |
668 | if (s->total_time) { | |
669 | s->mbps = (((double) transferred_bytes * 8.0) / | |
670 | ((double) s->total_time)) / 1000; | |
671 | } | |
672 | runstate_set(RUN_STATE_POSTMIGRATE); | |
673 | } else { | |
674 | if (old_vm_running) { | |
675 | vm_start(); | |
676 | } | |
677 | } | |
678 | qemu_bh_schedule(s->cleanup_bh); | |
679 | qemu_mutex_unlock_iothread(); | |
680 | ||
681 | return NULL; | |
682 | } | |
683 | ||
684 | void migrate_fd_connect(MigrationState *s) | |
685 | { | |
686 | s->state = MIG_STATE_SETUP; | |
687 | trace_migrate_set_state(MIG_STATE_SETUP); | |
688 | ||
689 | /* This is a best 1st approximation. ns to ms */ | |
690 | s->expected_downtime = max_downtime/1000000; | |
691 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); | |
692 | ||
693 | qemu_file_set_rate_limit(s->file, | |
694 | s->bandwidth_limit / XFER_LIMIT_RATIO); | |
695 | ||
696 | /* Notify before starting migration thread */ | |
697 | notifier_list_notify(&migration_state_notifiers, s); | |
698 | ||
699 | qemu_thread_create(&s->thread, "migration", migration_thread, s, | |
700 | QEMU_THREAD_JOINABLE); | |
701 | } |