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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 | #define MAX_THROTTLE (32 << 20) /* Migration speed throttling */ | |
30 | ||
31 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled | |
32 | * data. */ | |
33 | #define BUFFER_DELAY 100 | |
34 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
35 | ||
36 | /* Default compression thread count */ | |
37 | #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 | |
38 | /* Default decompression thread count, usually decompression is at | |
39 | * least 4 times as fast as compression.*/ | |
40 | #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 | |
41 | /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ | |
42 | #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 | |
43 | ||
44 | /* Migration XBZRLE default cache size */ | |
45 | #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) | |
46 | ||
47 | static NotifierList migration_state_notifiers = | |
48 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
49 | ||
50 | static bool deferred_incoming; | |
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 = MIGRATION_STATUS_NONE, | |
60 | .bandwidth_limit = MAX_THROTTLE, | |
61 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, | |
62 | .mbps = -1, | |
63 | .compress_thread_count = DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT, | |
64 | .decompress_thread_count = DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT, | |
65 | .compress_level = DEFAULT_MIGRATE_COMPRESS_LEVEL, | |
66 | }; | |
67 | ||
68 | return ¤t_migration; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Called on -incoming with a defer: uri. | |
73 | * The migration can be started later after any parameters have been | |
74 | * changed. | |
75 | */ | |
76 | static void deferred_incoming_migration(Error **errp) | |
77 | { | |
78 | if (deferred_incoming) { | |
79 | error_setg(errp, "Incoming migration already deferred"); | |
80 | } | |
81 | deferred_incoming = true; | |
82 | } | |
83 | ||
84 | void qemu_start_incoming_migration(const char *uri, Error **errp) | |
85 | { | |
86 | const char *p; | |
87 | ||
88 | if (!strcmp(uri, "defer")) { | |
89 | deferred_incoming_migration(errp); | |
90 | } else if (strstart(uri, "tcp:", &p)) { | |
91 | tcp_start_incoming_migration(p, errp); | |
92 | #ifdef CONFIG_RDMA | |
93 | } else if (strstart(uri, "rdma:", &p)) { | |
94 | rdma_start_incoming_migration(p, errp); | |
95 | #endif | |
96 | #if !defined(WIN32) | |
97 | } else if (strstart(uri, "exec:", &p)) { | |
98 | exec_start_incoming_migration(p, errp); | |
99 | } else if (strstart(uri, "unix:", &p)) { | |
100 | unix_start_incoming_migration(p, errp); | |
101 | } else if (strstart(uri, "fd:", &p)) { | |
102 | fd_start_incoming_migration(p, errp); | |
103 | #endif | |
104 | } else { | |
105 | error_setg(errp, "unknown migration protocol: %s", uri); | |
106 | } | |
107 | } | |
108 | ||
109 | static void process_incoming_migration_co(void *opaque) | |
110 | { | |
111 | QEMUFile *f = opaque; | |
112 | Error *local_err = NULL; | |
113 | int ret; | |
114 | ||
115 | ret = qemu_loadvm_state(f); | |
116 | qemu_fclose(f); | |
117 | free_xbzrle_decoded_buf(); | |
118 | if (ret < 0) { | |
119 | error_report("load of migration failed: %s", strerror(-ret)); | |
120 | migrate_decompress_threads_join(); | |
121 | exit(EXIT_FAILURE); | |
122 | } | |
123 | qemu_announce_self(); | |
124 | ||
125 | /* Make sure all file formats flush their mutable metadata */ | |
126 | bdrv_invalidate_cache_all(&local_err); | |
127 | if (local_err) { | |
128 | error_report_err(local_err); | |
129 | migrate_decompress_threads_join(); | |
130 | exit(EXIT_FAILURE); | |
131 | } | |
132 | ||
133 | if (autostart) { | |
134 | vm_start(); | |
135 | } else { | |
136 | runstate_set(RUN_STATE_PAUSED); | |
137 | } | |
138 | migrate_decompress_threads_join(); | |
139 | } | |
140 | ||
141 | void process_incoming_migration(QEMUFile *f) | |
142 | { | |
143 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); | |
144 | int fd = qemu_get_fd(f); | |
145 | ||
146 | assert(fd != -1); | |
147 | migrate_decompress_threads_create(); | |
148 | qemu_set_nonblock(fd); | |
149 | qemu_coroutine_enter(co, f); | |
150 | } | |
151 | ||
152 | /* amount of nanoseconds we are willing to wait for migration to be down. | |
153 | * the choice of nanoseconds is because it is the maximum resolution that | |
154 | * get_clock() can achieve. It is an internal measure. All user-visible | |
155 | * units must be in seconds */ | |
156 | static uint64_t max_downtime = 300000000; | |
157 | ||
158 | uint64_t migrate_max_downtime(void) | |
159 | { | |
160 | return max_downtime; | |
161 | } | |
162 | ||
163 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) | |
164 | { | |
165 | MigrationCapabilityStatusList *head = NULL; | |
166 | MigrationCapabilityStatusList *caps; | |
167 | MigrationState *s = migrate_get_current(); | |
168 | int i; | |
169 | ||
170 | caps = NULL; /* silence compiler warning */ | |
171 | for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) { | |
172 | if (head == NULL) { | |
173 | head = g_malloc0(sizeof(*caps)); | |
174 | caps = head; | |
175 | } else { | |
176 | caps->next = g_malloc0(sizeof(*caps)); | |
177 | caps = caps->next; | |
178 | } | |
179 | caps->value = | |
180 | g_malloc(sizeof(*caps->value)); | |
181 | caps->value->capability = i; | |
182 | caps->value->state = s->enabled_capabilities[i]; | |
183 | } | |
184 | ||
185 | return head; | |
186 | } | |
187 | ||
188 | static void get_xbzrle_cache_stats(MigrationInfo *info) | |
189 | { | |
190 | if (migrate_use_xbzrle()) { | |
191 | info->has_xbzrle_cache = true; | |
192 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
193 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
194 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
195 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
196 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
197 | info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate(); | |
198 | info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); | |
199 | } | |
200 | } | |
201 | ||
202 | MigrationInfo *qmp_query_migrate(Error **errp) | |
203 | { | |
204 | MigrationInfo *info = g_malloc0(sizeof(*info)); | |
205 | MigrationState *s = migrate_get_current(); | |
206 | ||
207 | switch (s->state) { | |
208 | case MIGRATION_STATUS_NONE: | |
209 | /* no migration has happened ever */ | |
210 | break; | |
211 | case MIGRATION_STATUS_SETUP: | |
212 | info->has_status = true; | |
213 | info->has_total_time = false; | |
214 | break; | |
215 | case MIGRATION_STATUS_ACTIVE: | |
216 | case MIGRATION_STATUS_CANCELLING: | |
217 | info->has_status = true; | |
218 | info->has_total_time = true; | |
219 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
220 | - s->total_time; | |
221 | info->has_expected_downtime = true; | |
222 | info->expected_downtime = s->expected_downtime; | |
223 | info->has_setup_time = true; | |
224 | info->setup_time = s->setup_time; | |
225 | ||
226 | info->has_ram = true; | |
227 | info->ram = g_malloc0(sizeof(*info->ram)); | |
228 | info->ram->transferred = ram_bytes_transferred(); | |
229 | info->ram->remaining = ram_bytes_remaining(); | |
230 | info->ram->total = ram_bytes_total(); | |
231 | info->ram->duplicate = dup_mig_pages_transferred(); | |
232 | info->ram->skipped = skipped_mig_pages_transferred(); | |
233 | info->ram->normal = norm_mig_pages_transferred(); | |
234 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
235 | info->ram->dirty_pages_rate = s->dirty_pages_rate; | |
236 | info->ram->mbps = s->mbps; | |
237 | info->ram->dirty_sync_count = s->dirty_sync_count; | |
238 | ||
239 | if (blk_mig_active()) { | |
240 | info->has_disk = true; | |
241 | info->disk = g_malloc0(sizeof(*info->disk)); | |
242 | info->disk->transferred = blk_mig_bytes_transferred(); | |
243 | info->disk->remaining = blk_mig_bytes_remaining(); | |
244 | info->disk->total = blk_mig_bytes_total(); | |
245 | } | |
246 | ||
247 | get_xbzrle_cache_stats(info); | |
248 | break; | |
249 | case MIGRATION_STATUS_COMPLETED: | |
250 | get_xbzrle_cache_stats(info); | |
251 | ||
252 | info->has_status = true; | |
253 | info->has_total_time = true; | |
254 | info->total_time = s->total_time; | |
255 | info->has_downtime = true; | |
256 | info->downtime = s->downtime; | |
257 | info->has_setup_time = true; | |
258 | info->setup_time = s->setup_time; | |
259 | ||
260 | info->has_ram = true; | |
261 | info->ram = g_malloc0(sizeof(*info->ram)); | |
262 | info->ram->transferred = ram_bytes_transferred(); | |
263 | info->ram->remaining = 0; | |
264 | info->ram->total = ram_bytes_total(); | |
265 | info->ram->duplicate = dup_mig_pages_transferred(); | |
266 | info->ram->skipped = skipped_mig_pages_transferred(); | |
267 | info->ram->normal = norm_mig_pages_transferred(); | |
268 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
269 | info->ram->mbps = s->mbps; | |
270 | info->ram->dirty_sync_count = s->dirty_sync_count; | |
271 | break; | |
272 | case MIGRATION_STATUS_FAILED: | |
273 | info->has_status = true; | |
274 | break; | |
275 | case MIGRATION_STATUS_CANCELLED: | |
276 | info->has_status = true; | |
277 | break; | |
278 | } | |
279 | info->status = s->state; | |
280 | ||
281 | return info; | |
282 | } | |
283 | ||
284 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, | |
285 | Error **errp) | |
286 | { | |
287 | MigrationState *s = migrate_get_current(); | |
288 | MigrationCapabilityStatusList *cap; | |
289 | ||
290 | if (s->state == MIGRATION_STATUS_ACTIVE || | |
291 | s->state == MIGRATION_STATUS_SETUP) { | |
292 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
293 | return; | |
294 | } | |
295 | ||
296 | for (cap = params; cap; cap = cap->next) { | |
297 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
298 | } | |
299 | } | |
300 | ||
301 | /* shared migration helpers */ | |
302 | ||
303 | static void migrate_set_state(MigrationState *s, int old_state, int new_state) | |
304 | { | |
305 | if (atomic_cmpxchg(&s->state, old_state, new_state) == new_state) { | |
306 | trace_migrate_set_state(new_state); | |
307 | } | |
308 | } | |
309 | ||
310 | static void migrate_fd_cleanup(void *opaque) | |
311 | { | |
312 | MigrationState *s = opaque; | |
313 | ||
314 | qemu_bh_delete(s->cleanup_bh); | |
315 | s->cleanup_bh = NULL; | |
316 | ||
317 | if (s->file) { | |
318 | trace_migrate_fd_cleanup(); | |
319 | qemu_mutex_unlock_iothread(); | |
320 | qemu_thread_join(&s->thread); | |
321 | qemu_mutex_lock_iothread(); | |
322 | ||
323 | migrate_compress_threads_join(); | |
324 | qemu_fclose(s->file); | |
325 | s->file = NULL; | |
326 | } | |
327 | ||
328 | assert(s->state != MIGRATION_STATUS_ACTIVE); | |
329 | ||
330 | if (s->state != MIGRATION_STATUS_COMPLETED) { | |
331 | qemu_savevm_state_cancel(); | |
332 | if (s->state == MIGRATION_STATUS_CANCELLING) { | |
333 | migrate_set_state(s, MIGRATION_STATUS_CANCELLING, | |
334 | MIGRATION_STATUS_CANCELLED); | |
335 | } | |
336 | } | |
337 | ||
338 | notifier_list_notify(&migration_state_notifiers, s); | |
339 | } | |
340 | ||
341 | void migrate_fd_error(MigrationState *s) | |
342 | { | |
343 | trace_migrate_fd_error(); | |
344 | assert(s->file == NULL); | |
345 | s->state = MIGRATION_STATUS_FAILED; | |
346 | trace_migrate_set_state(MIGRATION_STATUS_FAILED); | |
347 | notifier_list_notify(&migration_state_notifiers, s); | |
348 | } | |
349 | ||
350 | static void migrate_fd_cancel(MigrationState *s) | |
351 | { | |
352 | int old_state ; | |
353 | QEMUFile *f = migrate_get_current()->file; | |
354 | trace_migrate_fd_cancel(); | |
355 | ||
356 | do { | |
357 | old_state = s->state; | |
358 | if (old_state != MIGRATION_STATUS_SETUP && | |
359 | old_state != MIGRATION_STATUS_ACTIVE) { | |
360 | break; | |
361 | } | |
362 | migrate_set_state(s, old_state, MIGRATION_STATUS_CANCELLING); | |
363 | } while (s->state != MIGRATION_STATUS_CANCELLING); | |
364 | ||
365 | /* | |
366 | * If we're unlucky the migration code might be stuck somewhere in a | |
367 | * send/write while the network has failed and is waiting to timeout; | |
368 | * if we've got shutdown(2) available then we can force it to quit. | |
369 | * The outgoing qemu file gets closed in migrate_fd_cleanup that is | |
370 | * called in a bh, so there is no race against this cancel. | |
371 | */ | |
372 | if (s->state == MIGRATION_STATUS_CANCELLING && f) { | |
373 | qemu_file_shutdown(f); | |
374 | } | |
375 | } | |
376 | ||
377 | void add_migration_state_change_notifier(Notifier *notify) | |
378 | { | |
379 | notifier_list_add(&migration_state_notifiers, notify); | |
380 | } | |
381 | ||
382 | void remove_migration_state_change_notifier(Notifier *notify) | |
383 | { | |
384 | notifier_remove(notify); | |
385 | } | |
386 | ||
387 | bool migration_in_setup(MigrationState *s) | |
388 | { | |
389 | return s->state == MIGRATION_STATUS_SETUP; | |
390 | } | |
391 | ||
392 | bool migration_has_finished(MigrationState *s) | |
393 | { | |
394 | return s->state == MIGRATION_STATUS_COMPLETED; | |
395 | } | |
396 | ||
397 | bool migration_has_failed(MigrationState *s) | |
398 | { | |
399 | return (s->state == MIGRATION_STATUS_CANCELLED || | |
400 | s->state == MIGRATION_STATUS_FAILED); | |
401 | } | |
402 | ||
403 | static MigrationState *migrate_init(const MigrationParams *params) | |
404 | { | |
405 | MigrationState *s = migrate_get_current(); | |
406 | int64_t bandwidth_limit = s->bandwidth_limit; | |
407 | bool enabled_capabilities[MIGRATION_CAPABILITY_MAX]; | |
408 | int64_t xbzrle_cache_size = s->xbzrle_cache_size; | |
409 | int compress_level = s->compress_level; | |
410 | int compress_thread_count = s->compress_thread_count; | |
411 | int decompress_thread_count = s->decompress_thread_count; | |
412 | ||
413 | memcpy(enabled_capabilities, s->enabled_capabilities, | |
414 | sizeof(enabled_capabilities)); | |
415 | ||
416 | memset(s, 0, sizeof(*s)); | |
417 | s->params = *params; | |
418 | memcpy(s->enabled_capabilities, enabled_capabilities, | |
419 | sizeof(enabled_capabilities)); | |
420 | s->xbzrle_cache_size = xbzrle_cache_size; | |
421 | ||
422 | s->compress_level = compress_level; | |
423 | s->compress_thread_count = compress_thread_count; | |
424 | s->decompress_thread_count = decompress_thread_count; | |
425 | s->bandwidth_limit = bandwidth_limit; | |
426 | s->state = MIGRATION_STATUS_SETUP; | |
427 | trace_migrate_set_state(MIGRATION_STATUS_SETUP); | |
428 | ||
429 | s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
430 | return s; | |
431 | } | |
432 | ||
433 | static GSList *migration_blockers; | |
434 | ||
435 | void migrate_add_blocker(Error *reason) | |
436 | { | |
437 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
438 | } | |
439 | ||
440 | void migrate_del_blocker(Error *reason) | |
441 | { | |
442 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
443 | } | |
444 | ||
445 | void qmp_migrate_incoming(const char *uri, Error **errp) | |
446 | { | |
447 | Error *local_err = NULL; | |
448 | static bool once = true; | |
449 | ||
450 | if (!deferred_incoming) { | |
451 | error_setg(errp, "For use with '-incoming defer'"); | |
452 | return; | |
453 | } | |
454 | if (!once) { | |
455 | error_setg(errp, "The incoming migration has already been started"); | |
456 | } | |
457 | ||
458 | qemu_start_incoming_migration(uri, &local_err); | |
459 | ||
460 | if (local_err) { | |
461 | error_propagate(errp, local_err); | |
462 | return; | |
463 | } | |
464 | ||
465 | once = false; | |
466 | } | |
467 | ||
468 | void qmp_migrate(const char *uri, bool has_blk, bool blk, | |
469 | bool has_inc, bool inc, bool has_detach, bool detach, | |
470 | Error **errp) | |
471 | { | |
472 | Error *local_err = NULL; | |
473 | MigrationState *s = migrate_get_current(); | |
474 | MigrationParams params; | |
475 | const char *p; | |
476 | ||
477 | params.blk = has_blk && blk; | |
478 | params.shared = has_inc && inc; | |
479 | ||
480 | if (s->state == MIGRATION_STATUS_ACTIVE || | |
481 | s->state == MIGRATION_STATUS_SETUP || | |
482 | s->state == MIGRATION_STATUS_CANCELLING) { | |
483 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
484 | return; | |
485 | } | |
486 | ||
487 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
488 | error_setg(errp, "Guest is waiting for an incoming migration"); | |
489 | return; | |
490 | } | |
491 | ||
492 | if (qemu_savevm_state_blocked(errp)) { | |
493 | return; | |
494 | } | |
495 | ||
496 | if (migration_blockers) { | |
497 | *errp = error_copy(migration_blockers->data); | |
498 | return; | |
499 | } | |
500 | ||
501 | s = migrate_init(¶ms); | |
502 | ||
503 | if (strstart(uri, "tcp:", &p)) { | |
504 | tcp_start_outgoing_migration(s, p, &local_err); | |
505 | #ifdef CONFIG_RDMA | |
506 | } else if (strstart(uri, "rdma:", &p)) { | |
507 | rdma_start_outgoing_migration(s, p, &local_err); | |
508 | #endif | |
509 | #if !defined(WIN32) | |
510 | } else if (strstart(uri, "exec:", &p)) { | |
511 | exec_start_outgoing_migration(s, p, &local_err); | |
512 | } else if (strstart(uri, "unix:", &p)) { | |
513 | unix_start_outgoing_migration(s, p, &local_err); | |
514 | } else if (strstart(uri, "fd:", &p)) { | |
515 | fd_start_outgoing_migration(s, p, &local_err); | |
516 | #endif | |
517 | } else { | |
518 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol"); | |
519 | s->state = MIGRATION_STATUS_FAILED; | |
520 | return; | |
521 | } | |
522 | ||
523 | if (local_err) { | |
524 | migrate_fd_error(s); | |
525 | error_propagate(errp, local_err); | |
526 | return; | |
527 | } | |
528 | } | |
529 | ||
530 | void qmp_migrate_cancel(Error **errp) | |
531 | { | |
532 | migrate_fd_cancel(migrate_get_current()); | |
533 | } | |
534 | ||
535 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) | |
536 | { | |
537 | MigrationState *s = migrate_get_current(); | |
538 | int64_t new_size; | |
539 | ||
540 | /* Check for truncation */ | |
541 | if (value != (size_t)value) { | |
542 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
543 | "exceeding address space"); | |
544 | return; | |
545 | } | |
546 | ||
547 | /* Cache should not be larger than guest ram size */ | |
548 | if (value > ram_bytes_total()) { | |
549 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
550 | "exceeds guest ram size "); | |
551 | return; | |
552 | } | |
553 | ||
554 | new_size = xbzrle_cache_resize(value); | |
555 | if (new_size < 0) { | |
556 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
557 | "is smaller than page size"); | |
558 | return; | |
559 | } | |
560 | ||
561 | s->xbzrle_cache_size = new_size; | |
562 | } | |
563 | ||
564 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
565 | { | |
566 | return migrate_xbzrle_cache_size(); | |
567 | } | |
568 | ||
569 | void qmp_migrate_set_speed(int64_t value, Error **errp) | |
570 | { | |
571 | MigrationState *s; | |
572 | ||
573 | if (value < 0) { | |
574 | value = 0; | |
575 | } | |
576 | if (value > SIZE_MAX) { | |
577 | value = SIZE_MAX; | |
578 | } | |
579 | ||
580 | s = migrate_get_current(); | |
581 | s->bandwidth_limit = value; | |
582 | if (s->file) { | |
583 | qemu_file_set_rate_limit(s->file, s->bandwidth_limit / XFER_LIMIT_RATIO); | |
584 | } | |
585 | } | |
586 | ||
587 | void qmp_migrate_set_downtime(double value, Error **errp) | |
588 | { | |
589 | value *= 1e9; | |
590 | value = MAX(0, MIN(UINT64_MAX, value)); | |
591 | max_downtime = (uint64_t)value; | |
592 | } | |
593 | ||
594 | bool migrate_auto_converge(void) | |
595 | { | |
596 | MigrationState *s; | |
597 | ||
598 | s = migrate_get_current(); | |
599 | ||
600 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; | |
601 | } | |
602 | ||
603 | bool migrate_zero_blocks(void) | |
604 | { | |
605 | MigrationState *s; | |
606 | ||
607 | s = migrate_get_current(); | |
608 | ||
609 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; | |
610 | } | |
611 | ||
612 | bool migrate_use_compression(void) | |
613 | { | |
614 | /* Disable compression before the patch series are applied */ | |
615 | return false; | |
616 | } | |
617 | ||
618 | int migrate_compress_level(void) | |
619 | { | |
620 | MigrationState *s; | |
621 | ||
622 | s = migrate_get_current(); | |
623 | ||
624 | return s->compress_level; | |
625 | } | |
626 | ||
627 | int migrate_compress_threads(void) | |
628 | { | |
629 | MigrationState *s; | |
630 | ||
631 | s = migrate_get_current(); | |
632 | ||
633 | return s->compress_thread_count; | |
634 | } | |
635 | ||
636 | int migrate_decompress_threads(void) | |
637 | { | |
638 | MigrationState *s; | |
639 | ||
640 | s = migrate_get_current(); | |
641 | ||
642 | return s->decompress_thread_count; | |
643 | } | |
644 | ||
645 | int migrate_use_xbzrle(void) | |
646 | { | |
647 | MigrationState *s; | |
648 | ||
649 | s = migrate_get_current(); | |
650 | ||
651 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
652 | } | |
653 | ||
654 | int64_t migrate_xbzrle_cache_size(void) | |
655 | { | |
656 | MigrationState *s; | |
657 | ||
658 | s = migrate_get_current(); | |
659 | ||
660 | return s->xbzrle_cache_size; | |
661 | } | |
662 | ||
663 | /* migration thread support */ | |
664 | ||
665 | static void *migration_thread(void *opaque) | |
666 | { | |
667 | MigrationState *s = opaque; | |
668 | int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
669 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); | |
670 | int64_t initial_bytes = 0; | |
671 | int64_t max_size = 0; | |
672 | int64_t start_time = initial_time; | |
673 | bool old_vm_running = false; | |
674 | ||
675 | qemu_savevm_state_begin(s->file, &s->params); | |
676 | ||
677 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; | |
678 | migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_ACTIVE); | |
679 | ||
680 | while (s->state == MIGRATION_STATUS_ACTIVE) { | |
681 | int64_t current_time; | |
682 | uint64_t pending_size; | |
683 | ||
684 | if (!qemu_file_rate_limit(s->file)) { | |
685 | pending_size = qemu_savevm_state_pending(s->file, max_size); | |
686 | trace_migrate_pending(pending_size, max_size); | |
687 | if (pending_size && pending_size >= max_size) { | |
688 | qemu_savevm_state_iterate(s->file); | |
689 | } else { | |
690 | int ret; | |
691 | ||
692 | qemu_mutex_lock_iothread(); | |
693 | start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
694 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
695 | old_vm_running = runstate_is_running(); | |
696 | ||
697 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
698 | if (ret >= 0) { | |
699 | qemu_file_set_rate_limit(s->file, INT64_MAX); | |
700 | qemu_savevm_state_complete(s->file); | |
701 | } | |
702 | qemu_mutex_unlock_iothread(); | |
703 | ||
704 | if (ret < 0) { | |
705 | migrate_set_state(s, MIGRATION_STATUS_ACTIVE, | |
706 | MIGRATION_STATUS_FAILED); | |
707 | break; | |
708 | } | |
709 | ||
710 | if (!qemu_file_get_error(s->file)) { | |
711 | migrate_set_state(s, MIGRATION_STATUS_ACTIVE, | |
712 | MIGRATION_STATUS_COMPLETED); | |
713 | break; | |
714 | } | |
715 | } | |
716 | } | |
717 | ||
718 | if (qemu_file_get_error(s->file)) { | |
719 | migrate_set_state(s, MIGRATION_STATUS_ACTIVE, | |
720 | MIGRATION_STATUS_FAILED); | |
721 | break; | |
722 | } | |
723 | current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
724 | if (current_time >= initial_time + BUFFER_DELAY) { | |
725 | uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes; | |
726 | uint64_t time_spent = current_time - initial_time; | |
727 | double bandwidth = transferred_bytes / time_spent; | |
728 | max_size = bandwidth * migrate_max_downtime() / 1000000; | |
729 | ||
730 | s->mbps = time_spent ? (((double) transferred_bytes * 8.0) / | |
731 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0 : -1; | |
732 | ||
733 | trace_migrate_transferred(transferred_bytes, time_spent, | |
734 | bandwidth, max_size); | |
735 | /* if we haven't sent anything, we don't want to recalculate | |
736 | 10000 is a small enough number for our purposes */ | |
737 | if (s->dirty_bytes_rate && transferred_bytes > 10000) { | |
738 | s->expected_downtime = s->dirty_bytes_rate / bandwidth; | |
739 | } | |
740 | ||
741 | qemu_file_reset_rate_limit(s->file); | |
742 | initial_time = current_time; | |
743 | initial_bytes = qemu_ftell(s->file); | |
744 | } | |
745 | if (qemu_file_rate_limit(s->file)) { | |
746 | /* usleep expects microseconds */ | |
747 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
748 | } | |
749 | } | |
750 | ||
751 | qemu_mutex_lock_iothread(); | |
752 | if (s->state == MIGRATION_STATUS_COMPLETED) { | |
753 | int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
754 | uint64_t transferred_bytes = qemu_ftell(s->file); | |
755 | s->total_time = end_time - s->total_time; | |
756 | s->downtime = end_time - start_time; | |
757 | if (s->total_time) { | |
758 | s->mbps = (((double) transferred_bytes * 8.0) / | |
759 | ((double) s->total_time)) / 1000; | |
760 | } | |
761 | runstate_set(RUN_STATE_POSTMIGRATE); | |
762 | } else { | |
763 | if (old_vm_running) { | |
764 | vm_start(); | |
765 | } | |
766 | } | |
767 | qemu_bh_schedule(s->cleanup_bh); | |
768 | qemu_mutex_unlock_iothread(); | |
769 | ||
770 | return NULL; | |
771 | } | |
772 | ||
773 | void migrate_fd_connect(MigrationState *s) | |
774 | { | |
775 | s->state = MIGRATION_STATUS_SETUP; | |
776 | trace_migrate_set_state(MIGRATION_STATUS_SETUP); | |
777 | ||
778 | /* This is a best 1st approximation. ns to ms */ | |
779 | s->expected_downtime = max_downtime/1000000; | |
780 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); | |
781 | ||
782 | qemu_file_set_rate_limit(s->file, | |
783 | s->bandwidth_limit / XFER_LIMIT_RATIO); | |
784 | ||
785 | /* Notify before starting migration thread */ | |
786 | notifier_list_notify(&migration_state_notifiers, s); | |
787 | ||
788 | migrate_compress_threads_create(); | |
789 | qemu_thread_create(&s->thread, "migration", migration_thread, s, | |
790 | QEMU_THREAD_JOINABLE); | |
791 | } |