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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 DEBUG_MIGRATION | |
30 | ||
31 | #ifdef DEBUG_MIGRATION | |
32 | #define DPRINTF(fmt, ...) \ | |
33 | do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) | |
34 | #else | |
35 | #define DPRINTF(fmt, ...) \ | |
36 | do { } while (0) | |
37 | #endif | |
38 | ||
39 | enum { | |
40 | MIG_STATE_ERROR = -1, | |
41 | MIG_STATE_NONE, | |
42 | MIG_STATE_SETUP, | |
43 | MIG_STATE_CANCELLED, | |
44 | MIG_STATE_ACTIVE, | |
45 | MIG_STATE_COMPLETED, | |
46 | }; | |
47 | ||
48 | #define MAX_THROTTLE (32 << 20) /* Migration speed throttling */ | |
49 | ||
50 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled | |
51 | * data. */ | |
52 | #define BUFFER_DELAY 100 | |
53 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
54 | ||
55 | /* Migration XBZRLE default cache size */ | |
56 | #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) | |
57 | ||
58 | static NotifierList migration_state_notifiers = | |
59 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
60 | ||
61 | /* When we add fault tolerance, we could have several | |
62 | migrations at once. For now we don't need to add | |
63 | dynamic creation of migration */ | |
64 | ||
65 | MigrationState *migrate_get_current(void) | |
66 | { | |
67 | static MigrationState current_migration = { | |
68 | .state = MIG_STATE_NONE, | |
69 | .bandwidth_limit = MAX_THROTTLE, | |
70 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, | |
71 | .mbps = -1, | |
72 | }; | |
73 | ||
74 | return ¤t_migration; | |
75 | } | |
76 | ||
77 | void qemu_start_incoming_migration(const char *uri, Error **errp) | |
78 | { | |
79 | const char *p; | |
80 | ||
81 | if (strstart(uri, "tcp:", &p)) | |
82 | tcp_start_incoming_migration(p, errp); | |
83 | #ifdef CONFIG_RDMA | |
84 | else if (strstart(uri, "x-rdma:", &p)) | |
85 | rdma_start_incoming_migration(p, errp); | |
86 | #endif | |
87 | #if !defined(WIN32) | |
88 | else if (strstart(uri, "exec:", &p)) | |
89 | exec_start_incoming_migration(p, errp); | |
90 | else if (strstart(uri, "unix:", &p)) | |
91 | unix_start_incoming_migration(p, errp); | |
92 | else if (strstart(uri, "fd:", &p)) | |
93 | fd_start_incoming_migration(p, errp); | |
94 | #endif | |
95 | else { | |
96 | error_setg(errp, "unknown migration protocol: %s", uri); | |
97 | } | |
98 | } | |
99 | ||
100 | static void process_incoming_migration_co(void *opaque) | |
101 | { | |
102 | QEMUFile *f = opaque; | |
103 | int ret; | |
104 | ||
105 | ret = qemu_loadvm_state(f); | |
106 | qemu_fclose(f); | |
107 | if (ret < 0) { | |
108 | fprintf(stderr, "load of migration failed\n"); | |
109 | exit(EXIT_FAILURE); | |
110 | } | |
111 | qemu_announce_self(); | |
112 | DPRINTF("successfully loaded vm state\n"); | |
113 | ||
114 | bdrv_clear_incoming_migration_all(); | |
115 | /* Make sure all file formats flush their mutable metadata */ | |
116 | bdrv_invalidate_cache_all(); | |
117 | ||
118 | if (autostart) { | |
119 | vm_start(); | |
120 | } else { | |
121 | runstate_set(RUN_STATE_PAUSED); | |
122 | } | |
123 | } | |
124 | ||
125 | void process_incoming_migration(QEMUFile *f) | |
126 | { | |
127 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); | |
128 | int fd = qemu_get_fd(f); | |
129 | ||
130 | assert(fd != -1); | |
131 | qemu_set_nonblock(fd); | |
132 | qemu_coroutine_enter(co, f); | |
133 | } | |
134 | ||
135 | /* amount of nanoseconds we are willing to wait for migration to be down. | |
136 | * the choice of nanoseconds is because it is the maximum resolution that | |
137 | * get_clock() can achieve. It is an internal measure. All user-visible | |
138 | * units must be in seconds */ | |
139 | static uint64_t max_downtime = 30000000; | |
140 | ||
141 | uint64_t migrate_max_downtime(void) | |
142 | { | |
143 | return max_downtime; | |
144 | } | |
145 | ||
146 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) | |
147 | { | |
148 | MigrationCapabilityStatusList *head = NULL; | |
149 | MigrationCapabilityStatusList *caps; | |
150 | MigrationState *s = migrate_get_current(); | |
151 | int i; | |
152 | ||
153 | caps = NULL; /* silence compiler warning */ | |
154 | for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) { | |
155 | if (head == NULL) { | |
156 | head = g_malloc0(sizeof(*caps)); | |
157 | caps = head; | |
158 | } else { | |
159 | caps->next = g_malloc0(sizeof(*caps)); | |
160 | caps = caps->next; | |
161 | } | |
162 | caps->value = | |
163 | g_malloc(sizeof(*caps->value)); | |
164 | caps->value->capability = i; | |
165 | caps->value->state = s->enabled_capabilities[i]; | |
166 | } | |
167 | ||
168 | return head; | |
169 | } | |
170 | ||
171 | static void get_xbzrle_cache_stats(MigrationInfo *info) | |
172 | { | |
173 | if (migrate_use_xbzrle()) { | |
174 | info->has_xbzrle_cache = true; | |
175 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
176 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
177 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
178 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
179 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
180 | info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); | |
181 | } | |
182 | } | |
183 | ||
184 | MigrationInfo *qmp_query_migrate(Error **errp) | |
185 | { | |
186 | MigrationInfo *info = g_malloc0(sizeof(*info)); | |
187 | MigrationState *s = migrate_get_current(); | |
188 | ||
189 | switch (s->state) { | |
190 | case MIG_STATE_NONE: | |
191 | /* no migration has happened ever */ | |
192 | break; | |
193 | case MIG_STATE_SETUP: | |
194 | info->has_status = true; | |
195 | info->status = g_strdup("setup"); | |
196 | info->has_total_time = false; | |
197 | break; | |
198 | case MIG_STATE_ACTIVE: | |
199 | info->has_status = true; | |
200 | info->status = g_strdup("active"); | |
201 | info->has_total_time = true; | |
202 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
203 | - s->total_time; | |
204 | info->has_expected_downtime = true; | |
205 | info->expected_downtime = s->expected_downtime; | |
206 | info->has_setup_time = true; | |
207 | info->setup_time = s->setup_time; | |
208 | ||
209 | info->has_ram = true; | |
210 | info->ram = g_malloc0(sizeof(*info->ram)); | |
211 | info->ram->transferred = ram_bytes_transferred(); | |
212 | info->ram->remaining = ram_bytes_remaining(); | |
213 | info->ram->total = ram_bytes_total(); | |
214 | info->ram->duplicate = dup_mig_pages_transferred(); | |
215 | info->ram->skipped = skipped_mig_pages_transferred(); | |
216 | info->ram->normal = norm_mig_pages_transferred(); | |
217 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
218 | info->ram->dirty_pages_rate = s->dirty_pages_rate; | |
219 | info->ram->mbps = s->mbps; | |
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 | break; | |
254 | case MIG_STATE_ERROR: | |
255 | info->has_status = true; | |
256 | info->status = g_strdup("failed"); | |
257 | break; | |
258 | case MIG_STATE_CANCELLED: | |
259 | info->has_status = true; | |
260 | info->status = g_strdup("cancelled"); | |
261 | break; | |
262 | } | |
263 | ||
264 | return info; | |
265 | } | |
266 | ||
267 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, | |
268 | Error **errp) | |
269 | { | |
270 | MigrationState *s = migrate_get_current(); | |
271 | MigrationCapabilityStatusList *cap; | |
272 | ||
273 | if (s->state == MIG_STATE_ACTIVE || s->state == MIG_STATE_SETUP) { | |
274 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
275 | return; | |
276 | } | |
277 | ||
278 | for (cap = params; cap; cap = cap->next) { | |
279 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
280 | } | |
281 | } | |
282 | ||
283 | /* shared migration helpers */ | |
284 | ||
285 | static void migrate_fd_cleanup(void *opaque) | |
286 | { | |
287 | MigrationState *s = opaque; | |
288 | ||
289 | qemu_bh_delete(s->cleanup_bh); | |
290 | s->cleanup_bh = NULL; | |
291 | ||
292 | if (s->file) { | |
293 | DPRINTF("closing file\n"); | |
294 | qemu_mutex_unlock_iothread(); | |
295 | qemu_thread_join(&s->thread); | |
296 | qemu_mutex_lock_iothread(); | |
297 | ||
298 | qemu_fclose(s->file); | |
299 | s->file = NULL; | |
300 | } | |
301 | ||
302 | assert(s->state != MIG_STATE_ACTIVE); | |
303 | ||
304 | if (s->state != MIG_STATE_COMPLETED) { | |
305 | qemu_savevm_state_cancel(); | |
306 | } | |
307 | ||
308 | notifier_list_notify(&migration_state_notifiers, s); | |
309 | } | |
310 | ||
311 | static void migrate_set_state(MigrationState *s, int old_state, int new_state) | |
312 | { | |
313 | if (atomic_cmpxchg(&s->state, old_state, new_state) == new_state) { | |
314 | trace_migrate_set_state(new_state); | |
315 | } | |
316 | } | |
317 | ||
318 | void migrate_fd_error(MigrationState *s) | |
319 | { | |
320 | DPRINTF("setting error state\n"); | |
321 | assert(s->file == NULL); | |
322 | s->state = MIG_STATE_ERROR; | |
323 | trace_migrate_set_state(MIG_STATE_ERROR); | |
324 | notifier_list_notify(&migration_state_notifiers, s); | |
325 | } | |
326 | ||
327 | static void migrate_fd_cancel(MigrationState *s) | |
328 | { | |
329 | DPRINTF("cancelling migration\n"); | |
330 | ||
331 | migrate_set_state(s, s->state, MIG_STATE_CANCELLED); | |
332 | } | |
333 | ||
334 | void add_migration_state_change_notifier(Notifier *notify) | |
335 | { | |
336 | notifier_list_add(&migration_state_notifiers, notify); | |
337 | } | |
338 | ||
339 | void remove_migration_state_change_notifier(Notifier *notify) | |
340 | { | |
341 | notifier_remove(notify); | |
342 | } | |
343 | ||
344 | bool migration_in_setup(MigrationState *s) | |
345 | { | |
346 | return s->state == MIG_STATE_SETUP; | |
347 | } | |
348 | ||
349 | bool migration_has_finished(MigrationState *s) | |
350 | { | |
351 | return s->state == MIG_STATE_COMPLETED; | |
352 | } | |
353 | ||
354 | bool migration_has_failed(MigrationState *s) | |
355 | { | |
356 | return (s->state == MIG_STATE_CANCELLED || | |
357 | s->state == MIG_STATE_ERROR); | |
358 | } | |
359 | ||
360 | static MigrationState *migrate_init(const MigrationParams *params) | |
361 | { | |
362 | MigrationState *s = migrate_get_current(); | |
363 | int64_t bandwidth_limit = s->bandwidth_limit; | |
364 | bool enabled_capabilities[MIGRATION_CAPABILITY_MAX]; | |
365 | int64_t xbzrle_cache_size = s->xbzrle_cache_size; | |
366 | ||
367 | memcpy(enabled_capabilities, s->enabled_capabilities, | |
368 | sizeof(enabled_capabilities)); | |
369 | ||
370 | memset(s, 0, sizeof(*s)); | |
371 | s->params = *params; | |
372 | memcpy(s->enabled_capabilities, enabled_capabilities, | |
373 | sizeof(enabled_capabilities)); | |
374 | s->xbzrle_cache_size = xbzrle_cache_size; | |
375 | ||
376 | s->bandwidth_limit = bandwidth_limit; | |
377 | s->state = MIG_STATE_SETUP; | |
378 | trace_migrate_set_state(MIG_STATE_SETUP); | |
379 | ||
380 | s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
381 | return s; | |
382 | } | |
383 | ||
384 | static GSList *migration_blockers; | |
385 | ||
386 | void migrate_add_blocker(Error *reason) | |
387 | { | |
388 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
389 | } | |
390 | ||
391 | void migrate_del_blocker(Error *reason) | |
392 | { | |
393 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
394 | } | |
395 | ||
396 | void qmp_migrate(const char *uri, bool has_blk, bool blk, | |
397 | bool has_inc, bool inc, bool has_detach, bool detach, | |
398 | Error **errp) | |
399 | { | |
400 | Error *local_err = NULL; | |
401 | MigrationState *s = migrate_get_current(); | |
402 | MigrationParams params; | |
403 | const char *p; | |
404 | ||
405 | params.blk = has_blk && blk; | |
406 | params.shared = has_inc && inc; | |
407 | ||
408 | if (s->state == MIG_STATE_ACTIVE || s->state == MIG_STATE_SETUP) { | |
409 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
410 | return; | |
411 | } | |
412 | ||
413 | if (qemu_savevm_state_blocked(errp)) { | |
414 | return; | |
415 | } | |
416 | ||
417 | if (migration_blockers) { | |
418 | *errp = error_copy(migration_blockers->data); | |
419 | return; | |
420 | } | |
421 | ||
422 | s = migrate_init(¶ms); | |
423 | ||
424 | if (strstart(uri, "tcp:", &p)) { | |
425 | tcp_start_outgoing_migration(s, p, &local_err); | |
426 | #ifdef CONFIG_RDMA | |
427 | } else if (strstart(uri, "x-rdma:", &p)) { | |
428 | rdma_start_outgoing_migration(s, p, &local_err); | |
429 | #endif | |
430 | #if !defined(WIN32) | |
431 | } else if (strstart(uri, "exec:", &p)) { | |
432 | exec_start_outgoing_migration(s, p, &local_err); | |
433 | } else if (strstart(uri, "unix:", &p)) { | |
434 | unix_start_outgoing_migration(s, p, &local_err); | |
435 | } else if (strstart(uri, "fd:", &p)) { | |
436 | fd_start_outgoing_migration(s, p, &local_err); | |
437 | #endif | |
438 | } else { | |
439 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol"); | |
440 | return; | |
441 | } | |
442 | ||
443 | if (local_err) { | |
444 | migrate_fd_error(s); | |
445 | error_propagate(errp, local_err); | |
446 | return; | |
447 | } | |
448 | } | |
449 | ||
450 | void qmp_migrate_cancel(Error **errp) | |
451 | { | |
452 | migrate_fd_cancel(migrate_get_current()); | |
453 | } | |
454 | ||
455 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) | |
456 | { | |
457 | MigrationState *s = migrate_get_current(); | |
458 | ||
459 | /* Check for truncation */ | |
460 | if (value != (size_t)value) { | |
461 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
462 | "exceeding address space"); | |
463 | return; | |
464 | } | |
465 | ||
466 | s->xbzrle_cache_size = xbzrle_cache_resize(value); | |
467 | } | |
468 | ||
469 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
470 | { | |
471 | return migrate_xbzrle_cache_size(); | |
472 | } | |
473 | ||
474 | void qmp_migrate_set_speed(int64_t value, Error **errp) | |
475 | { | |
476 | MigrationState *s; | |
477 | ||
478 | if (value < 0) { | |
479 | value = 0; | |
480 | } | |
481 | if (value > SIZE_MAX) { | |
482 | value = SIZE_MAX; | |
483 | } | |
484 | ||
485 | s = migrate_get_current(); | |
486 | s->bandwidth_limit = value; | |
487 | if (s->file) { | |
488 | qemu_file_set_rate_limit(s->file, s->bandwidth_limit / XFER_LIMIT_RATIO); | |
489 | } | |
490 | } | |
491 | ||
492 | void qmp_migrate_set_downtime(double value, Error **errp) | |
493 | { | |
494 | value *= 1e9; | |
495 | value = MAX(0, MIN(UINT64_MAX, value)); | |
496 | max_downtime = (uint64_t)value; | |
497 | } | |
498 | ||
499 | bool migrate_rdma_pin_all(void) | |
500 | { | |
501 | MigrationState *s; | |
502 | ||
503 | s = migrate_get_current(); | |
504 | ||
505 | return s->enabled_capabilities[MIGRATION_CAPABILITY_X_RDMA_PIN_ALL]; | |
506 | } | |
507 | ||
508 | bool migrate_auto_converge(void) | |
509 | { | |
510 | MigrationState *s; | |
511 | ||
512 | s = migrate_get_current(); | |
513 | ||
514 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; | |
515 | } | |
516 | ||
517 | bool migrate_zero_blocks(void) | |
518 | { | |
519 | MigrationState *s; | |
520 | ||
521 | s = migrate_get_current(); | |
522 | ||
523 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; | |
524 | } | |
525 | ||
526 | int migrate_use_xbzrle(void) | |
527 | { | |
528 | MigrationState *s; | |
529 | ||
530 | s = migrate_get_current(); | |
531 | ||
532 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
533 | } | |
534 | ||
535 | int64_t migrate_xbzrle_cache_size(void) | |
536 | { | |
537 | MigrationState *s; | |
538 | ||
539 | s = migrate_get_current(); | |
540 | ||
541 | return s->xbzrle_cache_size; | |
542 | } | |
543 | ||
544 | /* migration thread support */ | |
545 | ||
546 | static void *migration_thread(void *opaque) | |
547 | { | |
548 | MigrationState *s = opaque; | |
549 | int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
550 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); | |
551 | int64_t initial_bytes = 0; | |
552 | int64_t max_size = 0; | |
553 | int64_t start_time = initial_time; | |
554 | bool old_vm_running = false; | |
555 | ||
556 | DPRINTF("beginning savevm\n"); | |
557 | qemu_savevm_state_begin(s->file, &s->params); | |
558 | ||
559 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; | |
560 | migrate_set_state(s, MIG_STATE_SETUP, MIG_STATE_ACTIVE); | |
561 | ||
562 | DPRINTF("setup complete\n"); | |
563 | ||
564 | while (s->state == MIG_STATE_ACTIVE) { | |
565 | int64_t current_time; | |
566 | uint64_t pending_size; | |
567 | ||
568 | if (!qemu_file_rate_limit(s->file)) { | |
569 | DPRINTF("iterate\n"); | |
570 | pending_size = qemu_savevm_state_pending(s->file, max_size); | |
571 | DPRINTF("pending size %" PRIu64 " max %" PRIu64 "\n", | |
572 | pending_size, max_size); | |
573 | if (pending_size && pending_size >= max_size) { | |
574 | qemu_savevm_state_iterate(s->file); | |
575 | } else { | |
576 | int ret; | |
577 | ||
578 | DPRINTF("done iterating\n"); | |
579 | qemu_mutex_lock_iothread(); | |
580 | start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
581 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
582 | old_vm_running = runstate_is_running(); | |
583 | ||
584 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
585 | if (ret >= 0) { | |
586 | qemu_file_set_rate_limit(s->file, INT_MAX); | |
587 | qemu_savevm_state_complete(s->file); | |
588 | } | |
589 | qemu_mutex_unlock_iothread(); | |
590 | ||
591 | if (ret < 0) { | |
592 | migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR); | |
593 | break; | |
594 | } | |
595 | ||
596 | if (!qemu_file_get_error(s->file)) { | |
597 | migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_COMPLETED); | |
598 | break; | |
599 | } | |
600 | } | |
601 | } | |
602 | ||
603 | if (qemu_file_get_error(s->file)) { | |
604 | migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR); | |
605 | break; | |
606 | } | |
607 | current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
608 | if (current_time >= initial_time + BUFFER_DELAY) { | |
609 | uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes; | |
610 | uint64_t time_spent = current_time - initial_time; | |
611 | double bandwidth = transferred_bytes / time_spent; | |
612 | max_size = bandwidth * migrate_max_downtime() / 1000000; | |
613 | ||
614 | s->mbps = time_spent ? (((double) transferred_bytes * 8.0) / | |
615 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0 : -1; | |
616 | ||
617 | DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64 | |
618 | " bandwidth %g max_size %" PRId64 "\n", | |
619 | transferred_bytes, time_spent, bandwidth, max_size); | |
620 | /* if we haven't sent anything, we don't want to recalculate | |
621 | 10000 is a small enough number for our purposes */ | |
622 | if (s->dirty_bytes_rate && transferred_bytes > 10000) { | |
623 | s->expected_downtime = s->dirty_bytes_rate / bandwidth; | |
624 | } | |
625 | ||
626 | qemu_file_reset_rate_limit(s->file); | |
627 | initial_time = current_time; | |
628 | initial_bytes = qemu_ftell(s->file); | |
629 | } | |
630 | if (qemu_file_rate_limit(s->file)) { | |
631 | /* usleep expects microseconds */ | |
632 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
633 | } | |
634 | } | |
635 | ||
636 | qemu_mutex_lock_iothread(); | |
637 | if (s->state == MIG_STATE_COMPLETED) { | |
638 | int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
639 | s->total_time = end_time - s->total_time; | |
640 | s->downtime = end_time - start_time; | |
641 | runstate_set(RUN_STATE_POSTMIGRATE); | |
642 | } else { | |
643 | if (old_vm_running) { | |
644 | vm_start(); | |
645 | } | |
646 | } | |
647 | qemu_bh_schedule(s->cleanup_bh); | |
648 | qemu_mutex_unlock_iothread(); | |
649 | ||
650 | return NULL; | |
651 | } | |
652 | ||
653 | void migrate_fd_connect(MigrationState *s) | |
654 | { | |
655 | s->state = MIG_STATE_SETUP; | |
656 | trace_migrate_set_state(MIG_STATE_SETUP); | |
657 | ||
658 | /* This is a best 1st approximation. ns to ms */ | |
659 | s->expected_downtime = max_downtime/1000000; | |
660 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); | |
661 | ||
662 | qemu_file_set_rate_limit(s->file, | |
663 | s->bandwidth_limit / XFER_LIMIT_RATIO); | |
664 | ||
665 | /* Notify before starting migration thread */ | |
666 | notifier_list_notify(&migration_state_notifiers, s); | |
667 | ||
668 | qemu_thread_create(&s->thread, migration_thread, s, | |
669 | QEMU_THREAD_JOINABLE); | |
670 | } |