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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 "migration/migration.h" | |
18 | #include "monitor/monitor.h" | |
19 | #include "migration/qemu-file.h" | |
20 | #include "sysemu/sysemu.h" | |
21 | #include "block/block.h" | |
22 | #include "qemu/sockets.h" | |
23 | #include "migration/block.h" | |
24 | #include "qemu/thread.h" | |
25 | #include "qmp-commands.h" | |
26 | #include "trace.h" | |
27 | ||
28 | //#define DEBUG_MIGRATION | |
29 | ||
30 | #ifdef DEBUG_MIGRATION | |
31 | #define DPRINTF(fmt, ...) \ | |
32 | do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) | |
33 | #else | |
34 | #define DPRINTF(fmt, ...) \ | |
35 | do { } while (0) | |
36 | #endif | |
37 | ||
38 | enum { | |
39 | MIG_STATE_ERROR = -1, | |
40 | MIG_STATE_NONE, | |
41 | MIG_STATE_SETUP, | |
42 | MIG_STATE_CANCELLED, | |
43 | MIG_STATE_ACTIVE, | |
44 | MIG_STATE_COMPLETED, | |
45 | }; | |
46 | ||
47 | #define MAX_THROTTLE (32 << 20) /* Migration 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 | /* Migration XBZRLE default cache size */ | |
55 | #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) | |
56 | ||
57 | static NotifierList migration_state_notifiers = | |
58 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
59 | ||
60 | /* When we add fault tolerance, we could have several | |
61 | migrations at once. For now we don't need to add | |
62 | dynamic creation of migration */ | |
63 | ||
64 | MigrationState *migrate_get_current(void) | |
65 | { | |
66 | static MigrationState current_migration = { | |
67 | .state = MIG_STATE_NONE, | |
68 | .bandwidth_limit = MAX_THROTTLE, | |
69 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, | |
70 | .mbps = -1, | |
71 | }; | |
72 | ||
73 | return ¤t_migration; | |
74 | } | |
75 | ||
76 | void qemu_start_incoming_migration(const char *uri, Error **errp) | |
77 | { | |
78 | const char *p; | |
79 | ||
80 | if (strstart(uri, "tcp:", &p)) | |
81 | tcp_start_incoming_migration(p, errp); | |
82 | #ifdef CONFIG_RDMA | |
83 | else if (strstart(uri, "x-rdma:", &p)) | |
84 | rdma_start_incoming_migration(p, errp); | |
85 | #endif | |
86 | #if !defined(WIN32) | |
87 | else if (strstart(uri, "exec:", &p)) | |
88 | exec_start_incoming_migration(p, errp); | |
89 | else if (strstart(uri, "unix:", &p)) | |
90 | unix_start_incoming_migration(p, errp); | |
91 | else if (strstart(uri, "fd:", &p)) | |
92 | fd_start_incoming_migration(p, errp); | |
93 | #endif | |
94 | else { | |
95 | error_setg(errp, "unknown migration protocol: %s", uri); | |
96 | } | |
97 | } | |
98 | ||
99 | static void process_incoming_migration_co(void *opaque) | |
100 | { | |
101 | QEMUFile *f = opaque; | |
102 | int ret; | |
103 | ||
104 | ret = qemu_loadvm_state(f); | |
105 | qemu_fclose(f); | |
106 | if (ret < 0) { | |
107 | fprintf(stderr, "load of migration failed\n"); | |
108 | exit(EXIT_FAILURE); | |
109 | } | |
110 | qemu_announce_self(); | |
111 | DPRINTF("successfully loaded vm state\n"); | |
112 | ||
113 | bdrv_clear_incoming_migration_all(); | |
114 | /* Make sure all file formats flush their mutable metadata */ | |
115 | bdrv_invalidate_cache_all(); | |
116 | ||
117 | if (autostart) { | |
118 | vm_start(); | |
119 | } else { | |
120 | runstate_set(RUN_STATE_PAUSED); | |
121 | } | |
122 | } | |
123 | ||
124 | void process_incoming_migration(QEMUFile *f) | |
125 | { | |
126 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); | |
127 | int fd = qemu_get_fd(f); | |
128 | ||
129 | assert(fd != -1); | |
130 | qemu_set_nonblock(fd); | |
131 | qemu_coroutine_enter(co, f); | |
132 | } | |
133 | ||
134 | /* amount of nanoseconds we are willing to wait for migration to be down. | |
135 | * the choice of nanoseconds is because it is the maximum resolution that | |
136 | * get_clock() can achieve. It is an internal measure. All user-visible | |
137 | * units must be in seconds */ | |
138 | static uint64_t max_downtime = 30000000; | |
139 | ||
140 | uint64_t migrate_max_downtime(void) | |
141 | { | |
142 | return max_downtime; | |
143 | } | |
144 | ||
145 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) | |
146 | { | |
147 | MigrationCapabilityStatusList *head = NULL; | |
148 | MigrationCapabilityStatusList *caps; | |
149 | MigrationState *s = migrate_get_current(); | |
150 | int i; | |
151 | ||
152 | for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) { | |
153 | if (head == NULL) { | |
154 | head = g_malloc0(sizeof(*caps)); | |
155 | caps = head; | |
156 | } else { | |
157 | caps->next = g_malloc0(sizeof(*caps)); | |
158 | caps = caps->next; | |
159 | } | |
160 | caps->value = | |
161 | g_malloc(sizeof(*caps->value)); | |
162 | caps->value->capability = i; | |
163 | caps->value->state = s->enabled_capabilities[i]; | |
164 | } | |
165 | ||
166 | return head; | |
167 | } | |
168 | ||
169 | static void get_xbzrle_cache_stats(MigrationInfo *info) | |
170 | { | |
171 | if (migrate_use_xbzrle()) { | |
172 | info->has_xbzrle_cache = true; | |
173 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
174 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
175 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
176 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
177 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
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 | info->has_status = true; | |
198 | info->status = g_strdup("active"); | |
199 | info->has_total_time = true; | |
200 | info->total_time = qemu_get_clock_ms(rt_clock) | |
201 | - s->total_time; | |
202 | info->has_expected_downtime = true; | |
203 | info->expected_downtime = s->expected_downtime; | |
204 | info->has_setup_time = true; | |
205 | info->setup_time = s->setup_time; | |
206 | ||
207 | info->has_ram = true; | |
208 | info->ram = g_malloc0(sizeof(*info->ram)); | |
209 | info->ram->transferred = ram_bytes_transferred(); | |
210 | info->ram->remaining = ram_bytes_remaining(); | |
211 | info->ram->total = ram_bytes_total(); | |
212 | info->ram->duplicate = dup_mig_pages_transferred(); | |
213 | info->ram->skipped = skipped_mig_pages_transferred(); | |
214 | info->ram->normal = norm_mig_pages_transferred(); | |
215 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
216 | info->ram->dirty_pages_rate = s->dirty_pages_rate; | |
217 | info->ram->mbps = s->mbps; | |
218 | ||
219 | if (blk_mig_active()) { | |
220 | info->has_disk = true; | |
221 | info->disk = g_malloc0(sizeof(*info->disk)); | |
222 | info->disk->transferred = blk_mig_bytes_transferred(); | |
223 | info->disk->remaining = blk_mig_bytes_remaining(); | |
224 | info->disk->total = blk_mig_bytes_total(); | |
225 | } | |
226 | ||
227 | get_xbzrle_cache_stats(info); | |
228 | break; | |
229 | case MIG_STATE_COMPLETED: | |
230 | get_xbzrle_cache_stats(info); | |
231 | ||
232 | info->has_status = true; | |
233 | info->status = g_strdup("completed"); | |
234 | info->total_time = s->total_time; | |
235 | info->has_downtime = true; | |
236 | info->downtime = s->downtime; | |
237 | info->has_setup_time = true; | |
238 | info->setup_time = s->setup_time; | |
239 | ||
240 | info->has_ram = true; | |
241 | info->ram = g_malloc0(sizeof(*info->ram)); | |
242 | info->ram->transferred = ram_bytes_transferred(); | |
243 | info->ram->remaining = 0; | |
244 | info->ram->total = ram_bytes_total(); | |
245 | info->ram->duplicate = dup_mig_pages_transferred(); | |
246 | info->ram->skipped = skipped_mig_pages_transferred(); | |
247 | info->ram->normal = norm_mig_pages_transferred(); | |
248 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
249 | info->ram->mbps = s->mbps; | |
250 | break; | |
251 | case MIG_STATE_ERROR: | |
252 | info->has_status = true; | |
253 | info->status = g_strdup("failed"); | |
254 | break; | |
255 | case MIG_STATE_CANCELLED: | |
256 | info->has_status = true; | |
257 | info->status = g_strdup("cancelled"); | |
258 | break; | |
259 | } | |
260 | ||
261 | return info; | |
262 | } | |
263 | ||
264 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, | |
265 | Error **errp) | |
266 | { | |
267 | MigrationState *s = migrate_get_current(); | |
268 | MigrationCapabilityStatusList *cap; | |
269 | ||
270 | if (s->state == MIG_STATE_ACTIVE || s->state == MIG_STATE_SETUP) { | |
271 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
272 | return; | |
273 | } | |
274 | ||
275 | for (cap = params; cap; cap = cap->next) { | |
276 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
277 | } | |
278 | } | |
279 | ||
280 | /* shared migration helpers */ | |
281 | ||
282 | static void migrate_fd_cleanup(void *opaque) | |
283 | { | |
284 | MigrationState *s = opaque; | |
285 | ||
286 | qemu_bh_delete(s->cleanup_bh); | |
287 | s->cleanup_bh = NULL; | |
288 | ||
289 | if (s->file) { | |
290 | DPRINTF("closing file\n"); | |
291 | qemu_mutex_unlock_iothread(); | |
292 | qemu_thread_join(&s->thread); | |
293 | qemu_mutex_lock_iothread(); | |
294 | ||
295 | qemu_fclose(s->file); | |
296 | s->file = NULL; | |
297 | } | |
298 | ||
299 | assert(s->state != MIG_STATE_ACTIVE); | |
300 | ||
301 | if (s->state != MIG_STATE_COMPLETED) { | |
302 | qemu_savevm_state_cancel(); | |
303 | } | |
304 | ||
305 | notifier_list_notify(&migration_state_notifiers, s); | |
306 | } | |
307 | ||
308 | static void migrate_set_state(MigrationState *s, int old_state, int new_state) | |
309 | { | |
310 | if (atomic_cmpxchg(&s->state, old_state, new_state) == new_state) { | |
311 | trace_migrate_set_state(new_state); | |
312 | } | |
313 | } | |
314 | ||
315 | void migrate_fd_error(MigrationState *s) | |
316 | { | |
317 | DPRINTF("setting error state\n"); | |
318 | assert(s->file == NULL); | |
319 | s->state = MIG_STATE_ERROR; | |
320 | trace_migrate_set_state(MIG_STATE_ERROR); | |
321 | notifier_list_notify(&migration_state_notifiers, s); | |
322 | } | |
323 | ||
324 | static void migrate_fd_cancel(MigrationState *s) | |
325 | { | |
326 | DPRINTF("cancelling migration\n"); | |
327 | ||
328 | migrate_set_state(s, s->state, MIG_STATE_CANCELLED); | |
329 | } | |
330 | ||
331 | void add_migration_state_change_notifier(Notifier *notify) | |
332 | { | |
333 | notifier_list_add(&migration_state_notifiers, notify); | |
334 | } | |
335 | ||
336 | void remove_migration_state_change_notifier(Notifier *notify) | |
337 | { | |
338 | notifier_remove(notify); | |
339 | } | |
340 | ||
341 | bool migration_is_active(MigrationState *s) | |
342 | { | |
343 | return s->state == MIG_STATE_ACTIVE; | |
344 | } | |
345 | ||
346 | bool migration_has_finished(MigrationState *s) | |
347 | { | |
348 | return s->state == MIG_STATE_COMPLETED; | |
349 | } | |
350 | ||
351 | bool migration_has_failed(MigrationState *s) | |
352 | { | |
353 | return (s->state == MIG_STATE_CANCELLED || | |
354 | s->state == MIG_STATE_ERROR); | |
355 | } | |
356 | ||
357 | static MigrationState *migrate_init(const MigrationParams *params) | |
358 | { | |
359 | MigrationState *s = migrate_get_current(); | |
360 | int64_t bandwidth_limit = s->bandwidth_limit; | |
361 | bool enabled_capabilities[MIGRATION_CAPABILITY_MAX]; | |
362 | int64_t xbzrle_cache_size = s->xbzrle_cache_size; | |
363 | ||
364 | memcpy(enabled_capabilities, s->enabled_capabilities, | |
365 | sizeof(enabled_capabilities)); | |
366 | ||
367 | memset(s, 0, sizeof(*s)); | |
368 | s->params = *params; | |
369 | memcpy(s->enabled_capabilities, enabled_capabilities, | |
370 | sizeof(enabled_capabilities)); | |
371 | s->xbzrle_cache_size = xbzrle_cache_size; | |
372 | ||
373 | s->bandwidth_limit = bandwidth_limit; | |
374 | s->state = MIG_STATE_SETUP; | |
375 | trace_migrate_set_state(MIG_STATE_SETUP); | |
376 | ||
377 | s->total_time = qemu_get_clock_ms(rt_clock); | |
378 | return s; | |
379 | } | |
380 | ||
381 | static GSList *migration_blockers; | |
382 | ||
383 | void migrate_add_blocker(Error *reason) | |
384 | { | |
385 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
386 | } | |
387 | ||
388 | void migrate_del_blocker(Error *reason) | |
389 | { | |
390 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
391 | } | |
392 | ||
393 | void qmp_migrate(const char *uri, bool has_blk, bool blk, | |
394 | bool has_inc, bool inc, bool has_detach, bool detach, | |
395 | Error **errp) | |
396 | { | |
397 | Error *local_err = NULL; | |
398 | MigrationState *s = migrate_get_current(); | |
399 | MigrationParams params; | |
400 | const char *p; | |
401 | ||
402 | params.blk = blk; | |
403 | params.shared = inc; | |
404 | ||
405 | if (s->state == MIG_STATE_ACTIVE || s->state == MIG_STATE_SETUP) { | |
406 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
407 | return; | |
408 | } | |
409 | ||
410 | if (qemu_savevm_state_blocked(errp)) { | |
411 | return; | |
412 | } | |
413 | ||
414 | if (migration_blockers) { | |
415 | *errp = error_copy(migration_blockers->data); | |
416 | return; | |
417 | } | |
418 | ||
419 | s = migrate_init(¶ms); | |
420 | ||
421 | if (strstart(uri, "tcp:", &p)) { | |
422 | tcp_start_outgoing_migration(s, p, &local_err); | |
423 | #ifdef CONFIG_RDMA | |
424 | } else if (strstart(uri, "x-rdma:", &p)) { | |
425 | rdma_start_outgoing_migration(s, p, &local_err); | |
426 | #endif | |
427 | #if !defined(WIN32) | |
428 | } else if (strstart(uri, "exec:", &p)) { | |
429 | exec_start_outgoing_migration(s, p, &local_err); | |
430 | } else if (strstart(uri, "unix:", &p)) { | |
431 | unix_start_outgoing_migration(s, p, &local_err); | |
432 | } else if (strstart(uri, "fd:", &p)) { | |
433 | fd_start_outgoing_migration(s, p, &local_err); | |
434 | #endif | |
435 | } else { | |
436 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol"); | |
437 | return; | |
438 | } | |
439 | ||
440 | if (local_err) { | |
441 | migrate_fd_error(s); | |
442 | error_propagate(errp, local_err); | |
443 | return; | |
444 | } | |
445 | } | |
446 | ||
447 | void qmp_migrate_cancel(Error **errp) | |
448 | { | |
449 | migrate_fd_cancel(migrate_get_current()); | |
450 | } | |
451 | ||
452 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) | |
453 | { | |
454 | MigrationState *s = migrate_get_current(); | |
455 | ||
456 | /* Check for truncation */ | |
457 | if (value != (size_t)value) { | |
458 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
459 | "exceeding address space"); | |
460 | return; | |
461 | } | |
462 | ||
463 | s->xbzrle_cache_size = xbzrle_cache_resize(value); | |
464 | } | |
465 | ||
466 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
467 | { | |
468 | return migrate_xbzrle_cache_size(); | |
469 | } | |
470 | ||
471 | void qmp_migrate_set_speed(int64_t value, Error **errp) | |
472 | { | |
473 | MigrationState *s; | |
474 | ||
475 | if (value < 0) { | |
476 | value = 0; | |
477 | } | |
478 | if (value > SIZE_MAX) { | |
479 | value = SIZE_MAX; | |
480 | } | |
481 | ||
482 | s = migrate_get_current(); | |
483 | s->bandwidth_limit = value; | |
484 | if (s->file) { | |
485 | qemu_file_set_rate_limit(s->file, s->bandwidth_limit / XFER_LIMIT_RATIO); | |
486 | } | |
487 | } | |
488 | ||
489 | void qmp_migrate_set_downtime(double value, Error **errp) | |
490 | { | |
491 | value *= 1e9; | |
492 | value = MAX(0, MIN(UINT64_MAX, value)); | |
493 | max_downtime = (uint64_t)value; | |
494 | } | |
495 | ||
496 | bool migrate_rdma_pin_all(void) | |
497 | { | |
498 | MigrationState *s; | |
499 | ||
500 | s = migrate_get_current(); | |
501 | ||
502 | return s->enabled_capabilities[MIGRATION_CAPABILITY_X_RDMA_PIN_ALL]; | |
503 | } | |
504 | ||
505 | bool migrate_auto_converge(void) | |
506 | { | |
507 | MigrationState *s; | |
508 | ||
509 | s = migrate_get_current(); | |
510 | ||
511 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; | |
512 | } | |
513 | ||
514 | bool migrate_zero_blocks(void) | |
515 | { | |
516 | MigrationState *s; | |
517 | ||
518 | s = migrate_get_current(); | |
519 | ||
520 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; | |
521 | } | |
522 | ||
523 | int migrate_use_xbzrle(void) | |
524 | { | |
525 | MigrationState *s; | |
526 | ||
527 | s = migrate_get_current(); | |
528 | ||
529 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
530 | } | |
531 | ||
532 | int64_t migrate_xbzrle_cache_size(void) | |
533 | { | |
534 | MigrationState *s; | |
535 | ||
536 | s = migrate_get_current(); | |
537 | ||
538 | return s->xbzrle_cache_size; | |
539 | } | |
540 | ||
541 | /* migration thread support */ | |
542 | ||
543 | static void *migration_thread(void *opaque) | |
544 | { | |
545 | MigrationState *s = opaque; | |
546 | int64_t initial_time = qemu_get_clock_ms(rt_clock); | |
547 | int64_t setup_start = qemu_get_clock_ms(host_clock); | |
548 | int64_t initial_bytes = 0; | |
549 | int64_t max_size = 0; | |
550 | int64_t start_time = initial_time; | |
551 | bool old_vm_running = false; | |
552 | ||
553 | DPRINTF("beginning savevm\n"); | |
554 | qemu_savevm_state_begin(s->file, &s->params); | |
555 | ||
556 | s->setup_time = qemu_get_clock_ms(host_clock) - setup_start; | |
557 | migrate_set_state(s, MIG_STATE_SETUP, MIG_STATE_ACTIVE); | |
558 | ||
559 | DPRINTF("setup complete\n"); | |
560 | ||
561 | while (s->state == MIG_STATE_ACTIVE) { | |
562 | int64_t current_time; | |
563 | uint64_t pending_size; | |
564 | ||
565 | if (!qemu_file_rate_limit(s->file)) { | |
566 | DPRINTF("iterate\n"); | |
567 | pending_size = qemu_savevm_state_pending(s->file, max_size); | |
568 | DPRINTF("pending size %lu max %lu\n", pending_size, max_size); | |
569 | if (pending_size && pending_size >= max_size) { | |
570 | qemu_savevm_state_iterate(s->file); | |
571 | } else { | |
572 | int ret; | |
573 | ||
574 | DPRINTF("done iterating\n"); | |
575 | qemu_mutex_lock_iothread(); | |
576 | start_time = qemu_get_clock_ms(rt_clock); | |
577 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
578 | old_vm_running = runstate_is_running(); | |
579 | ||
580 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
581 | if (ret >= 0) { | |
582 | qemu_file_set_rate_limit(s->file, INT_MAX); | |
583 | qemu_savevm_state_complete(s->file); | |
584 | } | |
585 | qemu_mutex_unlock_iothread(); | |
586 | ||
587 | if (ret < 0) { | |
588 | migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR); | |
589 | break; | |
590 | } | |
591 | ||
592 | if (!qemu_file_get_error(s->file)) { | |
593 | migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_COMPLETED); | |
594 | break; | |
595 | } | |
596 | } | |
597 | } | |
598 | ||
599 | if (qemu_file_get_error(s->file)) { | |
600 | migrate_set_state(s, MIG_STATE_ACTIVE, MIG_STATE_ERROR); | |
601 | break; | |
602 | } | |
603 | current_time = qemu_get_clock_ms(rt_clock); | |
604 | if (current_time >= initial_time + BUFFER_DELAY) { | |
605 | uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes; | |
606 | uint64_t time_spent = current_time - initial_time; | |
607 | double bandwidth = transferred_bytes / time_spent; | |
608 | max_size = bandwidth * migrate_max_downtime() / 1000000; | |
609 | ||
610 | s->mbps = time_spent ? (((double) transferred_bytes * 8.0) / | |
611 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0 : -1; | |
612 | ||
613 | DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64 | |
614 | " bandwidth %g max_size %" PRId64 "\n", | |
615 | transferred_bytes, time_spent, bandwidth, max_size); | |
616 | /* if we haven't sent anything, we don't want to recalculate | |
617 | 10000 is a small enough number for our purposes */ | |
618 | if (s->dirty_bytes_rate && transferred_bytes > 10000) { | |
619 | s->expected_downtime = s->dirty_bytes_rate / bandwidth; | |
620 | } | |
621 | ||
622 | qemu_file_reset_rate_limit(s->file); | |
623 | initial_time = current_time; | |
624 | initial_bytes = qemu_ftell(s->file); | |
625 | } | |
626 | if (qemu_file_rate_limit(s->file)) { | |
627 | /* usleep expects microseconds */ | |
628 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
629 | } | |
630 | } | |
631 | ||
632 | qemu_mutex_lock_iothread(); | |
633 | if (s->state == MIG_STATE_COMPLETED) { | |
634 | int64_t end_time = qemu_get_clock_ms(rt_clock); | |
635 | s->total_time = end_time - s->total_time; | |
636 | s->downtime = end_time - start_time; | |
637 | runstate_set(RUN_STATE_POSTMIGRATE); | |
638 | } else { | |
639 | if (old_vm_running) { | |
640 | vm_start(); | |
641 | } | |
642 | } | |
643 | qemu_bh_schedule(s->cleanup_bh); | |
644 | qemu_mutex_unlock_iothread(); | |
645 | ||
646 | return NULL; | |
647 | } | |
648 | ||
649 | void migrate_fd_connect(MigrationState *s) | |
650 | { | |
651 | s->state = MIG_STATE_SETUP; | |
652 | trace_migrate_set_state(MIG_STATE_SETUP); | |
653 | ||
654 | /* This is a best 1st approximation. ns to ms */ | |
655 | s->expected_downtime = max_downtime/1000000; | |
656 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); | |
657 | ||
658 | qemu_file_set_rate_limit(s->file, | |
659 | s->bandwidth_limit / XFER_LIMIT_RATIO); | |
660 | ||
661 | qemu_thread_create(&s->thread, migration_thread, s, | |
662 | QEMU_THREAD_JOINABLE); | |
663 | notifier_list_notify(&migration_state_notifiers, s); | |
664 | } |