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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/osdep.h" | |
17 | #include "qemu-common.h" | |
18 | #include "qemu/error-report.h" | |
19 | #include "qemu/main-loop.h" | |
20 | #include "migration/migration.h" | |
21 | #include "migration/qemu-file.h" | |
22 | #include "sysemu/sysemu.h" | |
23 | #include "block/block.h" | |
24 | #include "qapi/qmp/qerror.h" | |
25 | #include "qapi/util.h" | |
26 | #include "qemu/sockets.h" | |
27 | #include "qemu/rcu.h" | |
28 | #include "migration/block.h" | |
29 | #include "migration/postcopy-ram.h" | |
30 | #include "qemu/thread.h" | |
31 | #include "qmp-commands.h" | |
32 | #include "trace.h" | |
33 | #include "qapi-event.h" | |
34 | #include "qom/cpu.h" | |
35 | #include "exec/memory.h" | |
36 | #include "exec/address-spaces.h" | |
37 | ||
38 | #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ | |
39 | ||
40 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled | |
41 | * data. */ | |
42 | #define BUFFER_DELAY 100 | |
43 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
44 | ||
45 | /* Default compression thread count */ | |
46 | #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 | |
47 | /* Default decompression thread count, usually decompression is at | |
48 | * least 4 times as fast as compression.*/ | |
49 | #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 | |
50 | /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ | |
51 | #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 | |
52 | /* Define default autoconverge cpu throttle migration parameters */ | |
53 | #define DEFAULT_MIGRATE_X_CPU_THROTTLE_INITIAL 20 | |
54 | #define DEFAULT_MIGRATE_X_CPU_THROTTLE_INCREMENT 10 | |
55 | ||
56 | /* Migration XBZRLE default cache size */ | |
57 | #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) | |
58 | ||
59 | static NotifierList migration_state_notifiers = | |
60 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
61 | ||
62 | static bool deferred_incoming; | |
63 | ||
64 | /* | |
65 | * Current state of incoming postcopy; note this is not part of | |
66 | * MigrationIncomingState since it's state is used during cleanup | |
67 | * at the end as MIS is being freed. | |
68 | */ | |
69 | static PostcopyState incoming_postcopy_state; | |
70 | ||
71 | /* When we add fault tolerance, we could have several | |
72 | migrations at once. For now we don't need to add | |
73 | dynamic creation of migration */ | |
74 | ||
75 | /* For outgoing */ | |
76 | MigrationState *migrate_get_current(void) | |
77 | { | |
78 | static bool once; | |
79 | static MigrationState current_migration = { | |
80 | .state = MIGRATION_STATUS_NONE, | |
81 | .bandwidth_limit = MAX_THROTTLE, | |
82 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, | |
83 | .mbps = -1, | |
84 | .parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = | |
85 | DEFAULT_MIGRATE_COMPRESS_LEVEL, | |
86 | .parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = | |
87 | DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT, | |
88 | .parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] = | |
89 | DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT, | |
90 | .parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] = | |
91 | DEFAULT_MIGRATE_X_CPU_THROTTLE_INITIAL, | |
92 | .parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] = | |
93 | DEFAULT_MIGRATE_X_CPU_THROTTLE_INCREMENT, | |
94 | }; | |
95 | ||
96 | if (!once) { | |
97 | qemu_mutex_init(¤t_migration.src_page_req_mutex); | |
98 | once = true; | |
99 | } | |
100 | return ¤t_migration; | |
101 | } | |
102 | ||
103 | /* For incoming */ | |
104 | static MigrationIncomingState *mis_current; | |
105 | ||
106 | MigrationIncomingState *migration_incoming_get_current(void) | |
107 | { | |
108 | return mis_current; | |
109 | } | |
110 | ||
111 | MigrationIncomingState *migration_incoming_state_new(QEMUFile* f) | |
112 | { | |
113 | mis_current = g_new0(MigrationIncomingState, 1); | |
114 | mis_current->from_src_file = f; | |
115 | mis_current->state = MIGRATION_STATUS_NONE; | |
116 | QLIST_INIT(&mis_current->loadvm_handlers); | |
117 | qemu_mutex_init(&mis_current->rp_mutex); | |
118 | qemu_event_init(&mis_current->main_thread_load_event, false); | |
119 | ||
120 | return mis_current; | |
121 | } | |
122 | ||
123 | void migration_incoming_state_destroy(void) | |
124 | { | |
125 | qemu_event_destroy(&mis_current->main_thread_load_event); | |
126 | loadvm_free_handlers(mis_current); | |
127 | g_free(mis_current); | |
128 | mis_current = NULL; | |
129 | } | |
130 | ||
131 | ||
132 | typedef struct { | |
133 | bool optional; | |
134 | uint32_t size; | |
135 | uint8_t runstate[100]; | |
136 | RunState state; | |
137 | bool received; | |
138 | } GlobalState; | |
139 | ||
140 | static GlobalState global_state; | |
141 | ||
142 | int global_state_store(void) | |
143 | { | |
144 | if (!runstate_store((char *)global_state.runstate, | |
145 | sizeof(global_state.runstate))) { | |
146 | error_report("runstate name too big: %s", global_state.runstate); | |
147 | trace_migrate_state_too_big(); | |
148 | return -EINVAL; | |
149 | } | |
150 | return 0; | |
151 | } | |
152 | ||
153 | void global_state_store_running(void) | |
154 | { | |
155 | const char *state = RunState_lookup[RUN_STATE_RUNNING]; | |
156 | strncpy((char *)global_state.runstate, | |
157 | state, sizeof(global_state.runstate)); | |
158 | } | |
159 | ||
160 | static bool global_state_received(void) | |
161 | { | |
162 | return global_state.received; | |
163 | } | |
164 | ||
165 | static RunState global_state_get_runstate(void) | |
166 | { | |
167 | return global_state.state; | |
168 | } | |
169 | ||
170 | void global_state_set_optional(void) | |
171 | { | |
172 | global_state.optional = true; | |
173 | } | |
174 | ||
175 | static bool global_state_needed(void *opaque) | |
176 | { | |
177 | GlobalState *s = opaque; | |
178 | char *runstate = (char *)s->runstate; | |
179 | ||
180 | /* If it is not optional, it is mandatory */ | |
181 | ||
182 | if (s->optional == false) { | |
183 | return true; | |
184 | } | |
185 | ||
186 | /* If state is running or paused, it is not needed */ | |
187 | ||
188 | if (strcmp(runstate, "running") == 0 || | |
189 | strcmp(runstate, "paused") == 0) { | |
190 | return false; | |
191 | } | |
192 | ||
193 | /* for any other state it is needed */ | |
194 | return true; | |
195 | } | |
196 | ||
197 | static int global_state_post_load(void *opaque, int version_id) | |
198 | { | |
199 | GlobalState *s = opaque; | |
200 | Error *local_err = NULL; | |
201 | int r; | |
202 | char *runstate = (char *)s->runstate; | |
203 | ||
204 | s->received = true; | |
205 | trace_migrate_global_state_post_load(runstate); | |
206 | ||
207 | r = qapi_enum_parse(RunState_lookup, runstate, RUN_STATE__MAX, | |
208 | -1, &local_err); | |
209 | ||
210 | if (r == -1) { | |
211 | if (local_err) { | |
212 | error_report_err(local_err); | |
213 | } | |
214 | return -EINVAL; | |
215 | } | |
216 | s->state = r; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static void global_state_pre_save(void *opaque) | |
222 | { | |
223 | GlobalState *s = opaque; | |
224 | ||
225 | trace_migrate_global_state_pre_save((char *)s->runstate); | |
226 | s->size = strlen((char *)s->runstate) + 1; | |
227 | } | |
228 | ||
229 | static const VMStateDescription vmstate_globalstate = { | |
230 | .name = "globalstate", | |
231 | .version_id = 1, | |
232 | .minimum_version_id = 1, | |
233 | .post_load = global_state_post_load, | |
234 | .pre_save = global_state_pre_save, | |
235 | .needed = global_state_needed, | |
236 | .fields = (VMStateField[]) { | |
237 | VMSTATE_UINT32(size, GlobalState), | |
238 | VMSTATE_BUFFER(runstate, GlobalState), | |
239 | VMSTATE_END_OF_LIST() | |
240 | }, | |
241 | }; | |
242 | ||
243 | void register_global_state(void) | |
244 | { | |
245 | /* We would use it independently that we receive it */ | |
246 | strcpy((char *)&global_state.runstate, ""); | |
247 | global_state.received = false; | |
248 | vmstate_register(NULL, 0, &vmstate_globalstate, &global_state); | |
249 | } | |
250 | ||
251 | static void migrate_generate_event(int new_state) | |
252 | { | |
253 | if (migrate_use_events()) { | |
254 | qapi_event_send_migration(new_state, &error_abort); | |
255 | } | |
256 | } | |
257 | ||
258 | /* | |
259 | * Called on -incoming with a defer: uri. | |
260 | * The migration can be started later after any parameters have been | |
261 | * changed. | |
262 | */ | |
263 | static void deferred_incoming_migration(Error **errp) | |
264 | { | |
265 | if (deferred_incoming) { | |
266 | error_setg(errp, "Incoming migration already deferred"); | |
267 | } | |
268 | deferred_incoming = true; | |
269 | } | |
270 | ||
271 | /* Request a range of pages from the source VM at the given | |
272 | * start address. | |
273 | * rbname: Name of the RAMBlock to request the page in, if NULL it's the same | |
274 | * as the last request (a name must have been given previously) | |
275 | * Start: Address offset within the RB | |
276 | * Len: Length in bytes required - must be a multiple of pagesize | |
277 | */ | |
278 | void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname, | |
279 | ram_addr_t start, size_t len) | |
280 | { | |
281 | uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname upto 256 */ | |
282 | size_t msglen = 12; /* start + len */ | |
283 | ||
284 | *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); | |
285 | *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); | |
286 | ||
287 | if (rbname) { | |
288 | int rbname_len = strlen(rbname); | |
289 | assert(rbname_len < 256); | |
290 | ||
291 | bufc[msglen++] = rbname_len; | |
292 | memcpy(bufc + msglen, rbname, rbname_len); | |
293 | msglen += rbname_len; | |
294 | migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc); | |
295 | } else { | |
296 | migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc); | |
297 | } | |
298 | } | |
299 | ||
300 | void qemu_start_incoming_migration(const char *uri, Error **errp) | |
301 | { | |
302 | const char *p; | |
303 | ||
304 | qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort); | |
305 | if (!strcmp(uri, "defer")) { | |
306 | deferred_incoming_migration(errp); | |
307 | } else if (strstart(uri, "tcp:", &p)) { | |
308 | tcp_start_incoming_migration(p, errp); | |
309 | #ifdef CONFIG_RDMA | |
310 | } else if (strstart(uri, "rdma:", &p)) { | |
311 | rdma_start_incoming_migration(p, errp); | |
312 | #endif | |
313 | #if !defined(WIN32) | |
314 | } else if (strstart(uri, "exec:", &p)) { | |
315 | exec_start_incoming_migration(p, errp); | |
316 | } else if (strstart(uri, "unix:", &p)) { | |
317 | unix_start_incoming_migration(p, errp); | |
318 | } else if (strstart(uri, "fd:", &p)) { | |
319 | fd_start_incoming_migration(p, errp); | |
320 | #endif | |
321 | } else { | |
322 | error_setg(errp, "unknown migration protocol: %s", uri); | |
323 | } | |
324 | } | |
325 | ||
326 | static void process_incoming_migration_bh(void *opaque) | |
327 | { | |
328 | Error *local_err = NULL; | |
329 | MigrationIncomingState *mis = opaque; | |
330 | ||
331 | /* Make sure all file formats flush their mutable metadata */ | |
332 | bdrv_invalidate_cache_all(&local_err); | |
333 | if (local_err) { | |
334 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
335 | MIGRATION_STATUS_FAILED); | |
336 | error_report_err(local_err); | |
337 | migrate_decompress_threads_join(); | |
338 | exit(EXIT_FAILURE); | |
339 | } | |
340 | ||
341 | /* | |
342 | * This must happen after all error conditions are dealt with and | |
343 | * we're sure the VM is going to be running on this host. | |
344 | */ | |
345 | qemu_announce_self(); | |
346 | ||
347 | /* If global state section was not received or we are in running | |
348 | state, we need to obey autostart. Any other state is set with | |
349 | runstate_set. */ | |
350 | ||
351 | if (!global_state_received() || | |
352 | global_state_get_runstate() == RUN_STATE_RUNNING) { | |
353 | if (autostart) { | |
354 | vm_start(); | |
355 | } else { | |
356 | runstate_set(RUN_STATE_PAUSED); | |
357 | } | |
358 | } else { | |
359 | runstate_set(global_state_get_runstate()); | |
360 | } | |
361 | migrate_decompress_threads_join(); | |
362 | /* | |
363 | * This must happen after any state changes since as soon as an external | |
364 | * observer sees this event they might start to prod at the VM assuming | |
365 | * it's ready to use. | |
366 | */ | |
367 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
368 | MIGRATION_STATUS_COMPLETED); | |
369 | qemu_bh_delete(mis->bh); | |
370 | migration_incoming_state_destroy(); | |
371 | } | |
372 | ||
373 | static void process_incoming_migration_co(void *opaque) | |
374 | { | |
375 | QEMUFile *f = opaque; | |
376 | MigrationIncomingState *mis; | |
377 | PostcopyState ps; | |
378 | int ret; | |
379 | ||
380 | mis = migration_incoming_state_new(f); | |
381 | postcopy_state_set(POSTCOPY_INCOMING_NONE); | |
382 | migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, | |
383 | MIGRATION_STATUS_ACTIVE); | |
384 | ret = qemu_loadvm_state(f); | |
385 | ||
386 | ps = postcopy_state_get(); | |
387 | trace_process_incoming_migration_co_end(ret, ps); | |
388 | if (ps != POSTCOPY_INCOMING_NONE) { | |
389 | if (ps == POSTCOPY_INCOMING_ADVISE) { | |
390 | /* | |
391 | * Where a migration had postcopy enabled (and thus went to advise) | |
392 | * but managed to complete within the precopy period, we can use | |
393 | * the normal exit. | |
394 | */ | |
395 | postcopy_ram_incoming_cleanup(mis); | |
396 | } else if (ret >= 0) { | |
397 | /* | |
398 | * Postcopy was started, cleanup should happen at the end of the | |
399 | * postcopy thread. | |
400 | */ | |
401 | trace_process_incoming_migration_co_postcopy_end_main(); | |
402 | return; | |
403 | } | |
404 | /* Else if something went wrong then just fall out of the normal exit */ | |
405 | } | |
406 | ||
407 | qemu_fclose(f); | |
408 | free_xbzrle_decoded_buf(); | |
409 | ||
410 | if (ret < 0) { | |
411 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
412 | MIGRATION_STATUS_FAILED); | |
413 | error_report("load of migration failed: %s", strerror(-ret)); | |
414 | migrate_decompress_threads_join(); | |
415 | exit(EXIT_FAILURE); | |
416 | } | |
417 | ||
418 | mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); | |
419 | qemu_bh_schedule(mis->bh); | |
420 | } | |
421 | ||
422 | void process_incoming_migration(QEMUFile *f) | |
423 | { | |
424 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); | |
425 | int fd = qemu_get_fd(f); | |
426 | ||
427 | assert(fd != -1); | |
428 | migrate_decompress_threads_create(); | |
429 | qemu_set_nonblock(fd); | |
430 | qemu_coroutine_enter(co, f); | |
431 | } | |
432 | ||
433 | /* | |
434 | * Send a message on the return channel back to the source | |
435 | * of the migration. | |
436 | */ | |
437 | void migrate_send_rp_message(MigrationIncomingState *mis, | |
438 | enum mig_rp_message_type message_type, | |
439 | uint16_t len, void *data) | |
440 | { | |
441 | trace_migrate_send_rp_message((int)message_type, len); | |
442 | qemu_mutex_lock(&mis->rp_mutex); | |
443 | qemu_put_be16(mis->to_src_file, (unsigned int)message_type); | |
444 | qemu_put_be16(mis->to_src_file, len); | |
445 | qemu_put_buffer(mis->to_src_file, data, len); | |
446 | qemu_fflush(mis->to_src_file); | |
447 | qemu_mutex_unlock(&mis->rp_mutex); | |
448 | } | |
449 | ||
450 | /* | |
451 | * Send a 'SHUT' message on the return channel with the given value | |
452 | * to indicate that we've finished with the RP. Non-0 value indicates | |
453 | * error. | |
454 | */ | |
455 | void migrate_send_rp_shut(MigrationIncomingState *mis, | |
456 | uint32_t value) | |
457 | { | |
458 | uint32_t buf; | |
459 | ||
460 | buf = cpu_to_be32(value); | |
461 | migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); | |
462 | } | |
463 | ||
464 | /* | |
465 | * Send a 'PONG' message on the return channel with the given value | |
466 | * (normally in response to a 'PING') | |
467 | */ | |
468 | void migrate_send_rp_pong(MigrationIncomingState *mis, | |
469 | uint32_t value) | |
470 | { | |
471 | uint32_t buf; | |
472 | ||
473 | buf = cpu_to_be32(value); | |
474 | migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); | |
475 | } | |
476 | ||
477 | /* amount of nanoseconds we are willing to wait for migration to be down. | |
478 | * the choice of nanoseconds is because it is the maximum resolution that | |
479 | * get_clock() can achieve. It is an internal measure. All user-visible | |
480 | * units must be in seconds */ | |
481 | static uint64_t max_downtime = 300000000; | |
482 | ||
483 | uint64_t migrate_max_downtime(void) | |
484 | { | |
485 | return max_downtime; | |
486 | } | |
487 | ||
488 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) | |
489 | { | |
490 | MigrationCapabilityStatusList *head = NULL; | |
491 | MigrationCapabilityStatusList *caps; | |
492 | MigrationState *s = migrate_get_current(); | |
493 | int i; | |
494 | ||
495 | caps = NULL; /* silence compiler warning */ | |
496 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { | |
497 | if (head == NULL) { | |
498 | head = g_malloc0(sizeof(*caps)); | |
499 | caps = head; | |
500 | } else { | |
501 | caps->next = g_malloc0(sizeof(*caps)); | |
502 | caps = caps->next; | |
503 | } | |
504 | caps->value = | |
505 | g_malloc(sizeof(*caps->value)); | |
506 | caps->value->capability = i; | |
507 | caps->value->state = s->enabled_capabilities[i]; | |
508 | } | |
509 | ||
510 | return head; | |
511 | } | |
512 | ||
513 | MigrationParameters *qmp_query_migrate_parameters(Error **errp) | |
514 | { | |
515 | MigrationParameters *params; | |
516 | MigrationState *s = migrate_get_current(); | |
517 | ||
518 | params = g_malloc0(sizeof(*params)); | |
519 | params->compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL]; | |
520 | params->compress_threads = | |
521 | s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS]; | |
522 | params->decompress_threads = | |
523 | s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS]; | |
524 | params->x_cpu_throttle_initial = | |
525 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL]; | |
526 | params->x_cpu_throttle_increment = | |
527 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT]; | |
528 | ||
529 | return params; | |
530 | } | |
531 | ||
532 | /* | |
533 | * Return true if we're already in the middle of a migration | |
534 | * (i.e. any of the active or setup states) | |
535 | */ | |
536 | static bool migration_is_setup_or_active(int state) | |
537 | { | |
538 | switch (state) { | |
539 | case MIGRATION_STATUS_ACTIVE: | |
540 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
541 | case MIGRATION_STATUS_SETUP: | |
542 | return true; | |
543 | ||
544 | default: | |
545 | return false; | |
546 | ||
547 | } | |
548 | } | |
549 | ||
550 | static void get_xbzrle_cache_stats(MigrationInfo *info) | |
551 | { | |
552 | if (migrate_use_xbzrle()) { | |
553 | info->has_xbzrle_cache = true; | |
554 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
555 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
556 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
557 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
558 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
559 | info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate(); | |
560 | info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); | |
561 | } | |
562 | } | |
563 | ||
564 | MigrationInfo *qmp_query_migrate(Error **errp) | |
565 | { | |
566 | MigrationInfo *info = g_malloc0(sizeof(*info)); | |
567 | MigrationState *s = migrate_get_current(); | |
568 | ||
569 | switch (s->state) { | |
570 | case MIGRATION_STATUS_NONE: | |
571 | /* no migration has happened ever */ | |
572 | break; | |
573 | case MIGRATION_STATUS_SETUP: | |
574 | info->has_status = true; | |
575 | info->has_total_time = false; | |
576 | break; | |
577 | case MIGRATION_STATUS_ACTIVE: | |
578 | case MIGRATION_STATUS_CANCELLING: | |
579 | info->has_status = true; | |
580 | info->has_total_time = true; | |
581 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
582 | - s->total_time; | |
583 | info->has_expected_downtime = true; | |
584 | info->expected_downtime = s->expected_downtime; | |
585 | info->has_setup_time = true; | |
586 | info->setup_time = s->setup_time; | |
587 | ||
588 | info->has_ram = true; | |
589 | info->ram = g_malloc0(sizeof(*info->ram)); | |
590 | info->ram->transferred = ram_bytes_transferred(); | |
591 | info->ram->remaining = ram_bytes_remaining(); | |
592 | info->ram->total = ram_bytes_total(); | |
593 | info->ram->duplicate = dup_mig_pages_transferred(); | |
594 | info->ram->skipped = skipped_mig_pages_transferred(); | |
595 | info->ram->normal = norm_mig_pages_transferred(); | |
596 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
597 | info->ram->dirty_pages_rate = s->dirty_pages_rate; | |
598 | info->ram->mbps = s->mbps; | |
599 | info->ram->dirty_sync_count = s->dirty_sync_count; | |
600 | ||
601 | if (blk_mig_active()) { | |
602 | info->has_disk = true; | |
603 | info->disk = g_malloc0(sizeof(*info->disk)); | |
604 | info->disk->transferred = blk_mig_bytes_transferred(); | |
605 | info->disk->remaining = blk_mig_bytes_remaining(); | |
606 | info->disk->total = blk_mig_bytes_total(); | |
607 | } | |
608 | ||
609 | if (cpu_throttle_active()) { | |
610 | info->has_x_cpu_throttle_percentage = true; | |
611 | info->x_cpu_throttle_percentage = cpu_throttle_get_percentage(); | |
612 | } | |
613 | ||
614 | get_xbzrle_cache_stats(info); | |
615 | break; | |
616 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
617 | /* Mostly the same as active; TODO add some postcopy stats */ | |
618 | info->has_status = true; | |
619 | info->has_total_time = true; | |
620 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
621 | - s->total_time; | |
622 | info->has_expected_downtime = true; | |
623 | info->expected_downtime = s->expected_downtime; | |
624 | info->has_setup_time = true; | |
625 | info->setup_time = s->setup_time; | |
626 | ||
627 | info->has_ram = true; | |
628 | info->ram = g_malloc0(sizeof(*info->ram)); | |
629 | info->ram->transferred = ram_bytes_transferred(); | |
630 | info->ram->remaining = ram_bytes_remaining(); | |
631 | info->ram->total = ram_bytes_total(); | |
632 | info->ram->duplicate = dup_mig_pages_transferred(); | |
633 | info->ram->skipped = skipped_mig_pages_transferred(); | |
634 | info->ram->normal = norm_mig_pages_transferred(); | |
635 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
636 | info->ram->dirty_pages_rate = s->dirty_pages_rate; | |
637 | info->ram->mbps = s->mbps; | |
638 | info->ram->dirty_sync_count = s->dirty_sync_count; | |
639 | ||
640 | if (blk_mig_active()) { | |
641 | info->has_disk = true; | |
642 | info->disk = g_malloc0(sizeof(*info->disk)); | |
643 | info->disk->transferred = blk_mig_bytes_transferred(); | |
644 | info->disk->remaining = blk_mig_bytes_remaining(); | |
645 | info->disk->total = blk_mig_bytes_total(); | |
646 | } | |
647 | ||
648 | get_xbzrle_cache_stats(info); | |
649 | break; | |
650 | case MIGRATION_STATUS_COMPLETED: | |
651 | get_xbzrle_cache_stats(info); | |
652 | ||
653 | info->has_status = true; | |
654 | info->has_total_time = true; | |
655 | info->total_time = s->total_time; | |
656 | info->has_downtime = true; | |
657 | info->downtime = s->downtime; | |
658 | info->has_setup_time = true; | |
659 | info->setup_time = s->setup_time; | |
660 | ||
661 | info->has_ram = true; | |
662 | info->ram = g_malloc0(sizeof(*info->ram)); | |
663 | info->ram->transferred = ram_bytes_transferred(); | |
664 | info->ram->remaining = 0; | |
665 | info->ram->total = ram_bytes_total(); | |
666 | info->ram->duplicate = dup_mig_pages_transferred(); | |
667 | info->ram->skipped = skipped_mig_pages_transferred(); | |
668 | info->ram->normal = norm_mig_pages_transferred(); | |
669 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
670 | info->ram->mbps = s->mbps; | |
671 | info->ram->dirty_sync_count = s->dirty_sync_count; | |
672 | break; | |
673 | case MIGRATION_STATUS_FAILED: | |
674 | info->has_status = true; | |
675 | break; | |
676 | case MIGRATION_STATUS_CANCELLED: | |
677 | info->has_status = true; | |
678 | break; | |
679 | } | |
680 | info->status = s->state; | |
681 | ||
682 | return info; | |
683 | } | |
684 | ||
685 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, | |
686 | Error **errp) | |
687 | { | |
688 | MigrationState *s = migrate_get_current(); | |
689 | MigrationCapabilityStatusList *cap; | |
690 | ||
691 | if (migration_is_setup_or_active(s->state)) { | |
692 | error_setg(errp, QERR_MIGRATION_ACTIVE); | |
693 | return; | |
694 | } | |
695 | ||
696 | for (cap = params; cap; cap = cap->next) { | |
697 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
698 | } | |
699 | ||
700 | if (migrate_postcopy_ram()) { | |
701 | if (migrate_use_compression()) { | |
702 | /* The decompression threads asynchronously write into RAM | |
703 | * rather than use the atomic copies needed to avoid | |
704 | * userfaulting. It should be possible to fix the decompression | |
705 | * threads for compatibility in future. | |
706 | */ | |
707 | error_report("Postcopy is not currently compatible with " | |
708 | "compression"); | |
709 | s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = | |
710 | false; | |
711 | } | |
712 | } | |
713 | } | |
714 | ||
715 | void qmp_migrate_set_parameters(bool has_compress_level, | |
716 | int64_t compress_level, | |
717 | bool has_compress_threads, | |
718 | int64_t compress_threads, | |
719 | bool has_decompress_threads, | |
720 | int64_t decompress_threads, | |
721 | bool has_x_cpu_throttle_initial, | |
722 | int64_t x_cpu_throttle_initial, | |
723 | bool has_x_cpu_throttle_increment, | |
724 | int64_t x_cpu_throttle_increment, Error **errp) | |
725 | { | |
726 | MigrationState *s = migrate_get_current(); | |
727 | ||
728 | if (has_compress_level && (compress_level < 0 || compress_level > 9)) { | |
729 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level", | |
730 | "is invalid, it should be in the range of 0 to 9"); | |
731 | return; | |
732 | } | |
733 | if (has_compress_threads && | |
734 | (compress_threads < 1 || compress_threads > 255)) { | |
735 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
736 | "compress_threads", | |
737 | "is invalid, it should be in the range of 1 to 255"); | |
738 | return; | |
739 | } | |
740 | if (has_decompress_threads && | |
741 | (decompress_threads < 1 || decompress_threads > 255)) { | |
742 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
743 | "decompress_threads", | |
744 | "is invalid, it should be in the range of 1 to 255"); | |
745 | return; | |
746 | } | |
747 | if (has_x_cpu_throttle_initial && | |
748 | (x_cpu_throttle_initial < 1 || x_cpu_throttle_initial > 99)) { | |
749 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
750 | "x_cpu_throttle_initial", | |
751 | "an integer in the range of 1 to 99"); | |
752 | } | |
753 | if (has_x_cpu_throttle_increment && | |
754 | (x_cpu_throttle_increment < 1 || x_cpu_throttle_increment > 99)) { | |
755 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
756 | "x_cpu_throttle_increment", | |
757 | "an integer in the range of 1 to 99"); | |
758 | } | |
759 | ||
760 | if (has_compress_level) { | |
761 | s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level; | |
762 | } | |
763 | if (has_compress_threads) { | |
764 | s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = compress_threads; | |
765 | } | |
766 | if (has_decompress_threads) { | |
767 | s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] = | |
768 | decompress_threads; | |
769 | } | |
770 | if (has_x_cpu_throttle_initial) { | |
771 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] = | |
772 | x_cpu_throttle_initial; | |
773 | } | |
774 | ||
775 | if (has_x_cpu_throttle_increment) { | |
776 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] = | |
777 | x_cpu_throttle_increment; | |
778 | } | |
779 | } | |
780 | ||
781 | void qmp_migrate_start_postcopy(Error **errp) | |
782 | { | |
783 | MigrationState *s = migrate_get_current(); | |
784 | ||
785 | if (!migrate_postcopy_ram()) { | |
786 | error_setg(errp, "Enable postcopy with migrate_set_capability before" | |
787 | " the start of migration"); | |
788 | return; | |
789 | } | |
790 | ||
791 | if (s->state == MIGRATION_STATUS_NONE) { | |
792 | error_setg(errp, "Postcopy must be started after migration has been" | |
793 | " started"); | |
794 | return; | |
795 | } | |
796 | /* | |
797 | * we don't error if migration has finished since that would be racy | |
798 | * with issuing this command. | |
799 | */ | |
800 | atomic_set(&s->start_postcopy, true); | |
801 | } | |
802 | ||
803 | /* shared migration helpers */ | |
804 | ||
805 | void migrate_set_state(int *state, int old_state, int new_state) | |
806 | { | |
807 | if (atomic_cmpxchg(state, old_state, new_state) == old_state) { | |
808 | trace_migrate_set_state(new_state); | |
809 | migrate_generate_event(new_state); | |
810 | } | |
811 | } | |
812 | ||
813 | static void migrate_fd_cleanup(void *opaque) | |
814 | { | |
815 | MigrationState *s = opaque; | |
816 | ||
817 | qemu_bh_delete(s->cleanup_bh); | |
818 | s->cleanup_bh = NULL; | |
819 | ||
820 | flush_page_queue(s); | |
821 | ||
822 | if (s->to_dst_file) { | |
823 | trace_migrate_fd_cleanup(); | |
824 | qemu_mutex_unlock_iothread(); | |
825 | if (s->migration_thread_running) { | |
826 | qemu_thread_join(&s->thread); | |
827 | s->migration_thread_running = false; | |
828 | } | |
829 | qemu_mutex_lock_iothread(); | |
830 | ||
831 | migrate_compress_threads_join(); | |
832 | qemu_fclose(s->to_dst_file); | |
833 | s->to_dst_file = NULL; | |
834 | } | |
835 | ||
836 | assert((s->state != MIGRATION_STATUS_ACTIVE) && | |
837 | (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE)); | |
838 | ||
839 | if (s->state == MIGRATION_STATUS_CANCELLING) { | |
840 | migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, | |
841 | MIGRATION_STATUS_CANCELLED); | |
842 | } | |
843 | ||
844 | notifier_list_notify(&migration_state_notifiers, s); | |
845 | } | |
846 | ||
847 | void migrate_fd_error(MigrationState *s) | |
848 | { | |
849 | trace_migrate_fd_error(); | |
850 | assert(s->to_dst_file == NULL); | |
851 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, | |
852 | MIGRATION_STATUS_FAILED); | |
853 | notifier_list_notify(&migration_state_notifiers, s); | |
854 | } | |
855 | ||
856 | static void migrate_fd_cancel(MigrationState *s) | |
857 | { | |
858 | int old_state ; | |
859 | QEMUFile *f = migrate_get_current()->to_dst_file; | |
860 | trace_migrate_fd_cancel(); | |
861 | ||
862 | if (s->rp_state.from_dst_file) { | |
863 | /* shutdown the rp socket, so causing the rp thread to shutdown */ | |
864 | qemu_file_shutdown(s->rp_state.from_dst_file); | |
865 | } | |
866 | ||
867 | do { | |
868 | old_state = s->state; | |
869 | if (!migration_is_setup_or_active(old_state)) { | |
870 | break; | |
871 | } | |
872 | migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); | |
873 | } while (s->state != MIGRATION_STATUS_CANCELLING); | |
874 | ||
875 | /* | |
876 | * If we're unlucky the migration code might be stuck somewhere in a | |
877 | * send/write while the network has failed and is waiting to timeout; | |
878 | * if we've got shutdown(2) available then we can force it to quit. | |
879 | * The outgoing qemu file gets closed in migrate_fd_cleanup that is | |
880 | * called in a bh, so there is no race against this cancel. | |
881 | */ | |
882 | if (s->state == MIGRATION_STATUS_CANCELLING && f) { | |
883 | qemu_file_shutdown(f); | |
884 | } | |
885 | } | |
886 | ||
887 | void add_migration_state_change_notifier(Notifier *notify) | |
888 | { | |
889 | notifier_list_add(&migration_state_notifiers, notify); | |
890 | } | |
891 | ||
892 | void remove_migration_state_change_notifier(Notifier *notify) | |
893 | { | |
894 | notifier_remove(notify); | |
895 | } | |
896 | ||
897 | bool migration_in_setup(MigrationState *s) | |
898 | { | |
899 | return s->state == MIGRATION_STATUS_SETUP; | |
900 | } | |
901 | ||
902 | bool migration_has_finished(MigrationState *s) | |
903 | { | |
904 | return s->state == MIGRATION_STATUS_COMPLETED; | |
905 | } | |
906 | ||
907 | bool migration_has_failed(MigrationState *s) | |
908 | { | |
909 | return (s->state == MIGRATION_STATUS_CANCELLED || | |
910 | s->state == MIGRATION_STATUS_FAILED); | |
911 | } | |
912 | ||
913 | bool migration_in_postcopy(MigrationState *s) | |
914 | { | |
915 | return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
916 | } | |
917 | ||
918 | bool migration_in_postcopy_after_devices(MigrationState *s) | |
919 | { | |
920 | return migration_in_postcopy(s) && s->postcopy_after_devices; | |
921 | } | |
922 | ||
923 | MigrationState *migrate_init(const MigrationParams *params) | |
924 | { | |
925 | MigrationState *s = migrate_get_current(); | |
926 | ||
927 | /* | |
928 | * Reinitialise all migration state, except | |
929 | * parameters/capabilities that the user set, and | |
930 | * locks. | |
931 | */ | |
932 | s->bytes_xfer = 0; | |
933 | s->xfer_limit = 0; | |
934 | s->cleanup_bh = 0; | |
935 | s->to_dst_file = NULL; | |
936 | s->state = MIGRATION_STATUS_NONE; | |
937 | s->params = *params; | |
938 | s->rp_state.from_dst_file = NULL; | |
939 | s->rp_state.error = false; | |
940 | s->mbps = 0.0; | |
941 | s->downtime = 0; | |
942 | s->expected_downtime = 0; | |
943 | s->dirty_pages_rate = 0; | |
944 | s->dirty_bytes_rate = 0; | |
945 | s->setup_time = 0; | |
946 | s->dirty_sync_count = 0; | |
947 | s->start_postcopy = false; | |
948 | s->postcopy_after_devices = false; | |
949 | s->migration_thread_running = false; | |
950 | s->last_req_rb = NULL; | |
951 | ||
952 | migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); | |
953 | ||
954 | QSIMPLEQ_INIT(&s->src_page_requests); | |
955 | ||
956 | s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
957 | return s; | |
958 | } | |
959 | ||
960 | static GSList *migration_blockers; | |
961 | ||
962 | void migrate_add_blocker(Error *reason) | |
963 | { | |
964 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
965 | } | |
966 | ||
967 | void migrate_del_blocker(Error *reason) | |
968 | { | |
969 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
970 | } | |
971 | ||
972 | void qmp_migrate_incoming(const char *uri, Error **errp) | |
973 | { | |
974 | Error *local_err = NULL; | |
975 | static bool once = true; | |
976 | ||
977 | if (!deferred_incoming) { | |
978 | error_setg(errp, "For use with '-incoming defer'"); | |
979 | return; | |
980 | } | |
981 | if (!once) { | |
982 | error_setg(errp, "The incoming migration has already been started"); | |
983 | } | |
984 | ||
985 | qemu_start_incoming_migration(uri, &local_err); | |
986 | ||
987 | if (local_err) { | |
988 | error_propagate(errp, local_err); | |
989 | return; | |
990 | } | |
991 | ||
992 | once = false; | |
993 | } | |
994 | ||
995 | void qmp_migrate(const char *uri, bool has_blk, bool blk, | |
996 | bool has_inc, bool inc, bool has_detach, bool detach, | |
997 | Error **errp) | |
998 | { | |
999 | Error *local_err = NULL; | |
1000 | MigrationState *s = migrate_get_current(); | |
1001 | MigrationParams params; | |
1002 | const char *p; | |
1003 | ||
1004 | params.blk = has_blk && blk; | |
1005 | params.shared = has_inc && inc; | |
1006 | ||
1007 | if (migration_is_setup_or_active(s->state) || | |
1008 | s->state == MIGRATION_STATUS_CANCELLING) { | |
1009 | error_setg(errp, QERR_MIGRATION_ACTIVE); | |
1010 | return; | |
1011 | } | |
1012 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
1013 | error_setg(errp, "Guest is waiting for an incoming migration"); | |
1014 | return; | |
1015 | } | |
1016 | ||
1017 | if (qemu_savevm_state_blocked(errp)) { | |
1018 | return; | |
1019 | } | |
1020 | ||
1021 | if (migration_blockers) { | |
1022 | *errp = error_copy(migration_blockers->data); | |
1023 | return; | |
1024 | } | |
1025 | ||
1026 | s = migrate_init(¶ms); | |
1027 | ||
1028 | if (strstart(uri, "tcp:", &p)) { | |
1029 | tcp_start_outgoing_migration(s, p, &local_err); | |
1030 | #ifdef CONFIG_RDMA | |
1031 | } else if (strstart(uri, "rdma:", &p)) { | |
1032 | rdma_start_outgoing_migration(s, p, &local_err); | |
1033 | #endif | |
1034 | #if !defined(WIN32) | |
1035 | } else if (strstart(uri, "exec:", &p)) { | |
1036 | exec_start_outgoing_migration(s, p, &local_err); | |
1037 | } else if (strstart(uri, "unix:", &p)) { | |
1038 | unix_start_outgoing_migration(s, p, &local_err); | |
1039 | } else if (strstart(uri, "fd:", &p)) { | |
1040 | fd_start_outgoing_migration(s, p, &local_err); | |
1041 | #endif | |
1042 | } else { | |
1043 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri", | |
1044 | "a valid migration protocol"); | |
1045 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, | |
1046 | MIGRATION_STATUS_FAILED); | |
1047 | return; | |
1048 | } | |
1049 | ||
1050 | if (local_err) { | |
1051 | migrate_fd_error(s); | |
1052 | error_propagate(errp, local_err); | |
1053 | return; | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | void qmp_migrate_cancel(Error **errp) | |
1058 | { | |
1059 | migrate_fd_cancel(migrate_get_current()); | |
1060 | } | |
1061 | ||
1062 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) | |
1063 | { | |
1064 | MigrationState *s = migrate_get_current(); | |
1065 | int64_t new_size; | |
1066 | ||
1067 | /* Check for truncation */ | |
1068 | if (value != (size_t)value) { | |
1069 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
1070 | "exceeding address space"); | |
1071 | return; | |
1072 | } | |
1073 | ||
1074 | /* Cache should not be larger than guest ram size */ | |
1075 | if (value > ram_bytes_total()) { | |
1076 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
1077 | "exceeds guest ram size "); | |
1078 | return; | |
1079 | } | |
1080 | ||
1081 | new_size = xbzrle_cache_resize(value); | |
1082 | if (new_size < 0) { | |
1083 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
1084 | "is smaller than page size"); | |
1085 | return; | |
1086 | } | |
1087 | ||
1088 | s->xbzrle_cache_size = new_size; | |
1089 | } | |
1090 | ||
1091 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
1092 | { | |
1093 | return migrate_xbzrle_cache_size(); | |
1094 | } | |
1095 | ||
1096 | void qmp_migrate_set_speed(int64_t value, Error **errp) | |
1097 | { | |
1098 | MigrationState *s; | |
1099 | ||
1100 | if (value < 0) { | |
1101 | value = 0; | |
1102 | } | |
1103 | if (value > SIZE_MAX) { | |
1104 | value = SIZE_MAX; | |
1105 | } | |
1106 | ||
1107 | s = migrate_get_current(); | |
1108 | s->bandwidth_limit = value; | |
1109 | if (s->to_dst_file) { | |
1110 | qemu_file_set_rate_limit(s->to_dst_file, | |
1111 | s->bandwidth_limit / XFER_LIMIT_RATIO); | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | void qmp_migrate_set_downtime(double value, Error **errp) | |
1116 | { | |
1117 | value *= 1e9; | |
1118 | value = MAX(0, MIN(UINT64_MAX, value)); | |
1119 | max_downtime = (uint64_t)value; | |
1120 | } | |
1121 | ||
1122 | bool migrate_postcopy_ram(void) | |
1123 | { | |
1124 | MigrationState *s; | |
1125 | ||
1126 | s = migrate_get_current(); | |
1127 | ||
1128 | return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM]; | |
1129 | } | |
1130 | ||
1131 | bool migrate_auto_converge(void) | |
1132 | { | |
1133 | MigrationState *s; | |
1134 | ||
1135 | s = migrate_get_current(); | |
1136 | ||
1137 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; | |
1138 | } | |
1139 | ||
1140 | bool migrate_zero_blocks(void) | |
1141 | { | |
1142 | MigrationState *s; | |
1143 | ||
1144 | s = migrate_get_current(); | |
1145 | ||
1146 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; | |
1147 | } | |
1148 | ||
1149 | bool migrate_use_compression(void) | |
1150 | { | |
1151 | MigrationState *s; | |
1152 | ||
1153 | s = migrate_get_current(); | |
1154 | ||
1155 | return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS]; | |
1156 | } | |
1157 | ||
1158 | int migrate_compress_level(void) | |
1159 | { | |
1160 | MigrationState *s; | |
1161 | ||
1162 | s = migrate_get_current(); | |
1163 | ||
1164 | return s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL]; | |
1165 | } | |
1166 | ||
1167 | int migrate_compress_threads(void) | |
1168 | { | |
1169 | MigrationState *s; | |
1170 | ||
1171 | s = migrate_get_current(); | |
1172 | ||
1173 | return s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS]; | |
1174 | } | |
1175 | ||
1176 | int migrate_decompress_threads(void) | |
1177 | { | |
1178 | MigrationState *s; | |
1179 | ||
1180 | s = migrate_get_current(); | |
1181 | ||
1182 | return s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS]; | |
1183 | } | |
1184 | ||
1185 | bool migrate_use_events(void) | |
1186 | { | |
1187 | MigrationState *s; | |
1188 | ||
1189 | s = migrate_get_current(); | |
1190 | ||
1191 | return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS]; | |
1192 | } | |
1193 | ||
1194 | int migrate_use_xbzrle(void) | |
1195 | { | |
1196 | MigrationState *s; | |
1197 | ||
1198 | s = migrate_get_current(); | |
1199 | ||
1200 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
1201 | } | |
1202 | ||
1203 | int64_t migrate_xbzrle_cache_size(void) | |
1204 | { | |
1205 | MigrationState *s; | |
1206 | ||
1207 | s = migrate_get_current(); | |
1208 | ||
1209 | return s->xbzrle_cache_size; | |
1210 | } | |
1211 | ||
1212 | /* migration thread support */ | |
1213 | /* | |
1214 | * Something bad happened to the RP stream, mark an error | |
1215 | * The caller shall print or trace something to indicate why | |
1216 | */ | |
1217 | static void mark_source_rp_bad(MigrationState *s) | |
1218 | { | |
1219 | s->rp_state.error = true; | |
1220 | } | |
1221 | ||
1222 | static struct rp_cmd_args { | |
1223 | ssize_t len; /* -1 = variable */ | |
1224 | const char *name; | |
1225 | } rp_cmd_args[] = { | |
1226 | [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, | |
1227 | [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, | |
1228 | [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, | |
1229 | [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, | |
1230 | [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, | |
1231 | [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, | |
1232 | }; | |
1233 | ||
1234 | /* | |
1235 | * Process a request for pages received on the return path, | |
1236 | * We're allowed to send more than requested (e.g. to round to our page size) | |
1237 | * and we don't need to send pages that have already been sent. | |
1238 | */ | |
1239 | static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, | |
1240 | ram_addr_t start, size_t len) | |
1241 | { | |
1242 | long our_host_ps = getpagesize(); | |
1243 | ||
1244 | trace_migrate_handle_rp_req_pages(rbname, start, len); | |
1245 | ||
1246 | /* | |
1247 | * Since we currently insist on matching page sizes, just sanity check | |
1248 | * we're being asked for whole host pages. | |
1249 | */ | |
1250 | if (start & (our_host_ps-1) || | |
1251 | (len & (our_host_ps-1))) { | |
1252 | error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT | |
1253 | " len: %zd", __func__, start, len); | |
1254 | mark_source_rp_bad(ms); | |
1255 | return; | |
1256 | } | |
1257 | ||
1258 | if (ram_save_queue_pages(ms, rbname, start, len)) { | |
1259 | mark_source_rp_bad(ms); | |
1260 | } | |
1261 | } | |
1262 | ||
1263 | /* | |
1264 | * Handles messages sent on the return path towards the source VM | |
1265 | * | |
1266 | */ | |
1267 | static void *source_return_path_thread(void *opaque) | |
1268 | { | |
1269 | MigrationState *ms = opaque; | |
1270 | QEMUFile *rp = ms->rp_state.from_dst_file; | |
1271 | uint16_t header_len, header_type; | |
1272 | uint8_t buf[512]; | |
1273 | uint32_t tmp32, sibling_error; | |
1274 | ram_addr_t start = 0; /* =0 to silence warning */ | |
1275 | size_t len = 0, expected_len; | |
1276 | int res; | |
1277 | ||
1278 | trace_source_return_path_thread_entry(); | |
1279 | while (!ms->rp_state.error && !qemu_file_get_error(rp) && | |
1280 | migration_is_setup_or_active(ms->state)) { | |
1281 | trace_source_return_path_thread_loop_top(); | |
1282 | header_type = qemu_get_be16(rp); | |
1283 | header_len = qemu_get_be16(rp); | |
1284 | ||
1285 | if (header_type >= MIG_RP_MSG_MAX || | |
1286 | header_type == MIG_RP_MSG_INVALID) { | |
1287 | error_report("RP: Received invalid message 0x%04x length 0x%04x", | |
1288 | header_type, header_len); | |
1289 | mark_source_rp_bad(ms); | |
1290 | goto out; | |
1291 | } | |
1292 | ||
1293 | if ((rp_cmd_args[header_type].len != -1 && | |
1294 | header_len != rp_cmd_args[header_type].len) || | |
1295 | header_len > sizeof(buf)) { | |
1296 | error_report("RP: Received '%s' message (0x%04x) with" | |
1297 | "incorrect length %d expecting %zu", | |
1298 | rp_cmd_args[header_type].name, header_type, header_len, | |
1299 | (size_t)rp_cmd_args[header_type].len); | |
1300 | mark_source_rp_bad(ms); | |
1301 | goto out; | |
1302 | } | |
1303 | ||
1304 | /* We know we've got a valid header by this point */ | |
1305 | res = qemu_get_buffer(rp, buf, header_len); | |
1306 | if (res != header_len) { | |
1307 | error_report("RP: Failed reading data for message 0x%04x" | |
1308 | " read %d expected %d", | |
1309 | header_type, res, header_len); | |
1310 | mark_source_rp_bad(ms); | |
1311 | goto out; | |
1312 | } | |
1313 | ||
1314 | /* OK, we have the message and the data */ | |
1315 | switch (header_type) { | |
1316 | case MIG_RP_MSG_SHUT: | |
1317 | sibling_error = be32_to_cpup((uint32_t *)buf); | |
1318 | trace_source_return_path_thread_shut(sibling_error); | |
1319 | if (sibling_error) { | |
1320 | error_report("RP: Sibling indicated error %d", sibling_error); | |
1321 | mark_source_rp_bad(ms); | |
1322 | } | |
1323 | /* | |
1324 | * We'll let the main thread deal with closing the RP | |
1325 | * we could do a shutdown(2) on it, but we're the only user | |
1326 | * anyway, so there's nothing gained. | |
1327 | */ | |
1328 | goto out; | |
1329 | ||
1330 | case MIG_RP_MSG_PONG: | |
1331 | tmp32 = be32_to_cpup((uint32_t *)buf); | |
1332 | trace_source_return_path_thread_pong(tmp32); | |
1333 | break; | |
1334 | ||
1335 | case MIG_RP_MSG_REQ_PAGES: | |
1336 | start = be64_to_cpup((uint64_t *)buf); | |
1337 | len = be32_to_cpup((uint32_t *)(buf + 8)); | |
1338 | migrate_handle_rp_req_pages(ms, NULL, start, len); | |
1339 | break; | |
1340 | ||
1341 | case MIG_RP_MSG_REQ_PAGES_ID: | |
1342 | expected_len = 12 + 1; /* header + termination */ | |
1343 | ||
1344 | if (header_len >= expected_len) { | |
1345 | start = be64_to_cpup((uint64_t *)buf); | |
1346 | len = be32_to_cpup((uint32_t *)(buf + 8)); | |
1347 | /* Now we expect an idstr */ | |
1348 | tmp32 = buf[12]; /* Length of the following idstr */ | |
1349 | buf[13 + tmp32] = '\0'; | |
1350 | expected_len += tmp32; | |
1351 | } | |
1352 | if (header_len != expected_len) { | |
1353 | error_report("RP: Req_Page_id with length %d expecting %zd", | |
1354 | header_len, expected_len); | |
1355 | mark_source_rp_bad(ms); | |
1356 | goto out; | |
1357 | } | |
1358 | migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); | |
1359 | break; | |
1360 | ||
1361 | default: | |
1362 | break; | |
1363 | } | |
1364 | } | |
1365 | if (qemu_file_get_error(rp)) { | |
1366 | trace_source_return_path_thread_bad_end(); | |
1367 | mark_source_rp_bad(ms); | |
1368 | } | |
1369 | ||
1370 | trace_source_return_path_thread_end(); | |
1371 | out: | |
1372 | ms->rp_state.from_dst_file = NULL; | |
1373 | qemu_fclose(rp); | |
1374 | return NULL; | |
1375 | } | |
1376 | ||
1377 | static int open_return_path_on_source(MigrationState *ms) | |
1378 | { | |
1379 | ||
1380 | ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); | |
1381 | if (!ms->rp_state.from_dst_file) { | |
1382 | return -1; | |
1383 | } | |
1384 | ||
1385 | trace_open_return_path_on_source(); | |
1386 | qemu_thread_create(&ms->rp_state.rp_thread, "return path", | |
1387 | source_return_path_thread, ms, QEMU_THREAD_JOINABLE); | |
1388 | ||
1389 | trace_open_return_path_on_source_continue(); | |
1390 | ||
1391 | return 0; | |
1392 | } | |
1393 | ||
1394 | /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ | |
1395 | static int await_return_path_close_on_source(MigrationState *ms) | |
1396 | { | |
1397 | /* | |
1398 | * If this is a normal exit then the destination will send a SHUT and the | |
1399 | * rp_thread will exit, however if there's an error we need to cause | |
1400 | * it to exit. | |
1401 | */ | |
1402 | if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) { | |
1403 | /* | |
1404 | * shutdown(2), if we have it, will cause it to unblock if it's stuck | |
1405 | * waiting for the destination. | |
1406 | */ | |
1407 | qemu_file_shutdown(ms->rp_state.from_dst_file); | |
1408 | mark_source_rp_bad(ms); | |
1409 | } | |
1410 | trace_await_return_path_close_on_source_joining(); | |
1411 | qemu_thread_join(&ms->rp_state.rp_thread); | |
1412 | trace_await_return_path_close_on_source_close(); | |
1413 | return ms->rp_state.error; | |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * Switch from normal iteration to postcopy | |
1418 | * Returns non-0 on error | |
1419 | */ | |
1420 | static int postcopy_start(MigrationState *ms, bool *old_vm_running) | |
1421 | { | |
1422 | int ret; | |
1423 | const QEMUSizedBuffer *qsb; | |
1424 | int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1425 | migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, | |
1426 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
1427 | ||
1428 | trace_postcopy_start(); | |
1429 | qemu_mutex_lock_iothread(); | |
1430 | trace_postcopy_start_set_run(); | |
1431 | ||
1432 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
1433 | *old_vm_running = runstate_is_running(); | |
1434 | global_state_store(); | |
1435 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
1436 | if (ret < 0) { | |
1437 | goto fail; | |
1438 | } | |
1439 | ||
1440 | ret = bdrv_inactivate_all(); | |
1441 | if (ret < 0) { | |
1442 | goto fail; | |
1443 | } | |
1444 | ||
1445 | /* | |
1446 | * Cause any non-postcopiable, but iterative devices to | |
1447 | * send out their final data. | |
1448 | */ | |
1449 | qemu_savevm_state_complete_precopy(ms->to_dst_file, true); | |
1450 | ||
1451 | /* | |
1452 | * in Finish migrate and with the io-lock held everything should | |
1453 | * be quiet, but we've potentially still got dirty pages and we | |
1454 | * need to tell the destination to throw any pages it's already received | |
1455 | * that are dirty | |
1456 | */ | |
1457 | if (ram_postcopy_send_discard_bitmap(ms)) { | |
1458 | error_report("postcopy send discard bitmap failed"); | |
1459 | goto fail; | |
1460 | } | |
1461 | ||
1462 | /* | |
1463 | * send rest of state - note things that are doing postcopy | |
1464 | * will notice we're in POSTCOPY_ACTIVE and not actually | |
1465 | * wrap their state up here | |
1466 | */ | |
1467 | qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX); | |
1468 | /* Ping just for debugging, helps line traces up */ | |
1469 | qemu_savevm_send_ping(ms->to_dst_file, 2); | |
1470 | ||
1471 | /* | |
1472 | * While loading the device state we may trigger page transfer | |
1473 | * requests and the fd must be free to process those, and thus | |
1474 | * the destination must read the whole device state off the fd before | |
1475 | * it starts processing it. Unfortunately the ad-hoc migration format | |
1476 | * doesn't allow the destination to know the size to read without fully | |
1477 | * parsing it through each devices load-state code (especially the open | |
1478 | * coded devices that use get/put). | |
1479 | * So we wrap the device state up in a package with a length at the start; | |
1480 | * to do this we use a qemu_buf to hold the whole of the device state. | |
1481 | */ | |
1482 | QEMUFile *fb = qemu_bufopen("w", NULL); | |
1483 | if (!fb) { | |
1484 | error_report("Failed to create buffered file"); | |
1485 | goto fail; | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Make sure the receiver can get incoming pages before we send the rest | |
1490 | * of the state | |
1491 | */ | |
1492 | qemu_savevm_send_postcopy_listen(fb); | |
1493 | ||
1494 | qemu_savevm_state_complete_precopy(fb, false); | |
1495 | qemu_savevm_send_ping(fb, 3); | |
1496 | ||
1497 | qemu_savevm_send_postcopy_run(fb); | |
1498 | ||
1499 | /* <><> end of stuff going into the package */ | |
1500 | qsb = qemu_buf_get(fb); | |
1501 | ||
1502 | /* Now send that blob */ | |
1503 | if (qemu_savevm_send_packaged(ms->to_dst_file, qsb)) { | |
1504 | goto fail_closefb; | |
1505 | } | |
1506 | qemu_fclose(fb); | |
1507 | ||
1508 | /* Send a notify to give a chance for anything that needs to happen | |
1509 | * at the transition to postcopy and after the device state; in particular | |
1510 | * spice needs to trigger a transition now | |
1511 | */ | |
1512 | ms->postcopy_after_devices = true; | |
1513 | notifier_list_notify(&migration_state_notifiers, ms); | |
1514 | ||
1515 | ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop; | |
1516 | ||
1517 | qemu_mutex_unlock_iothread(); | |
1518 | ||
1519 | /* | |
1520 | * Although this ping is just for debug, it could potentially be | |
1521 | * used for getting a better measurement of downtime at the source. | |
1522 | */ | |
1523 | qemu_savevm_send_ping(ms->to_dst_file, 4); | |
1524 | ||
1525 | ret = qemu_file_get_error(ms->to_dst_file); | |
1526 | if (ret) { | |
1527 | error_report("postcopy_start: Migration stream errored"); | |
1528 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, | |
1529 | MIGRATION_STATUS_FAILED); | |
1530 | } | |
1531 | ||
1532 | return ret; | |
1533 | ||
1534 | fail_closefb: | |
1535 | qemu_fclose(fb); | |
1536 | fail: | |
1537 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, | |
1538 | MIGRATION_STATUS_FAILED); | |
1539 | qemu_mutex_unlock_iothread(); | |
1540 | return -1; | |
1541 | } | |
1542 | ||
1543 | /** | |
1544 | * migration_completion: Used by migration_thread when there's not much left. | |
1545 | * The caller 'breaks' the loop when this returns. | |
1546 | * | |
1547 | * @s: Current migration state | |
1548 | * @current_active_state: The migration state we expect to be in | |
1549 | * @*old_vm_running: Pointer to old_vm_running flag | |
1550 | * @*start_time: Pointer to time to update | |
1551 | */ | |
1552 | static void migration_completion(MigrationState *s, int current_active_state, | |
1553 | bool *old_vm_running, | |
1554 | int64_t *start_time) | |
1555 | { | |
1556 | int ret; | |
1557 | ||
1558 | if (s->state == MIGRATION_STATUS_ACTIVE) { | |
1559 | qemu_mutex_lock_iothread(); | |
1560 | *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1561 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
1562 | *old_vm_running = runstate_is_running(); | |
1563 | ret = global_state_store(); | |
1564 | ||
1565 | if (!ret) { | |
1566 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
1567 | if (ret >= 0) { | |
1568 | ret = bdrv_inactivate_all(); | |
1569 | } | |
1570 | if (ret >= 0) { | |
1571 | qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); | |
1572 | qemu_savevm_state_complete_precopy(s->to_dst_file, false); | |
1573 | } | |
1574 | } | |
1575 | qemu_mutex_unlock_iothread(); | |
1576 | ||
1577 | if (ret < 0) { | |
1578 | goto fail; | |
1579 | } | |
1580 | } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1581 | trace_migration_completion_postcopy_end(); | |
1582 | ||
1583 | qemu_savevm_state_complete_postcopy(s->to_dst_file); | |
1584 | trace_migration_completion_postcopy_end_after_complete(); | |
1585 | } | |
1586 | ||
1587 | /* | |
1588 | * If rp was opened we must clean up the thread before | |
1589 | * cleaning everything else up (since if there are no failures | |
1590 | * it will wait for the destination to send it's status in | |
1591 | * a SHUT command). | |
1592 | * Postcopy opens rp if enabled (even if it's not avtivated) | |
1593 | */ | |
1594 | if (migrate_postcopy_ram()) { | |
1595 | int rp_error; | |
1596 | trace_migration_completion_postcopy_end_before_rp(); | |
1597 | rp_error = await_return_path_close_on_source(s); | |
1598 | trace_migration_completion_postcopy_end_after_rp(rp_error); | |
1599 | if (rp_error) { | |
1600 | goto fail; | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | if (qemu_file_get_error(s->to_dst_file)) { | |
1605 | trace_migration_completion_file_err(); | |
1606 | goto fail; | |
1607 | } | |
1608 | ||
1609 | migrate_set_state(&s->state, current_active_state, | |
1610 | MIGRATION_STATUS_COMPLETED); | |
1611 | return; | |
1612 | ||
1613 | fail: | |
1614 | migrate_set_state(&s->state, current_active_state, | |
1615 | MIGRATION_STATUS_FAILED); | |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | * Master migration thread on the source VM. | |
1620 | * It drives the migration and pumps the data down the outgoing channel. | |
1621 | */ | |
1622 | static void *migration_thread(void *opaque) | |
1623 | { | |
1624 | MigrationState *s = opaque; | |
1625 | /* Used by the bandwidth calcs, updated later */ | |
1626 | int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1627 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); | |
1628 | int64_t initial_bytes = 0; | |
1629 | int64_t max_size = 0; | |
1630 | int64_t start_time = initial_time; | |
1631 | int64_t end_time; | |
1632 | bool old_vm_running = false; | |
1633 | bool entered_postcopy = false; | |
1634 | /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */ | |
1635 | enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE; | |
1636 | ||
1637 | rcu_register_thread(); | |
1638 | ||
1639 | qemu_savevm_state_header(s->to_dst_file); | |
1640 | ||
1641 | if (migrate_postcopy_ram()) { | |
1642 | /* Now tell the dest that it should open its end so it can reply */ | |
1643 | qemu_savevm_send_open_return_path(s->to_dst_file); | |
1644 | ||
1645 | /* And do a ping that will make stuff easier to debug */ | |
1646 | qemu_savevm_send_ping(s->to_dst_file, 1); | |
1647 | ||
1648 | /* | |
1649 | * Tell the destination that we *might* want to do postcopy later; | |
1650 | * if the other end can't do postcopy it should fail now, nice and | |
1651 | * early. | |
1652 | */ | |
1653 | qemu_savevm_send_postcopy_advise(s->to_dst_file); | |
1654 | } | |
1655 | ||
1656 | qemu_savevm_state_begin(s->to_dst_file, &s->params); | |
1657 | ||
1658 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; | |
1659 | current_active_state = MIGRATION_STATUS_ACTIVE; | |
1660 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, | |
1661 | MIGRATION_STATUS_ACTIVE); | |
1662 | ||
1663 | trace_migration_thread_setup_complete(); | |
1664 | ||
1665 | while (s->state == MIGRATION_STATUS_ACTIVE || | |
1666 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1667 | int64_t current_time; | |
1668 | uint64_t pending_size; | |
1669 | ||
1670 | if (!qemu_file_rate_limit(s->to_dst_file)) { | |
1671 | uint64_t pend_post, pend_nonpost; | |
1672 | ||
1673 | qemu_savevm_state_pending(s->to_dst_file, max_size, &pend_nonpost, | |
1674 | &pend_post); | |
1675 | pending_size = pend_nonpost + pend_post; | |
1676 | trace_migrate_pending(pending_size, max_size, | |
1677 | pend_post, pend_nonpost); | |
1678 | if (pending_size && pending_size >= max_size) { | |
1679 | /* Still a significant amount to transfer */ | |
1680 | ||
1681 | if (migrate_postcopy_ram() && | |
1682 | s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE && | |
1683 | pend_nonpost <= max_size && | |
1684 | atomic_read(&s->start_postcopy)) { | |
1685 | ||
1686 | if (!postcopy_start(s, &old_vm_running)) { | |
1687 | current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE; | |
1688 | entered_postcopy = true; | |
1689 | } | |
1690 | ||
1691 | continue; | |
1692 | } | |
1693 | /* Just another iteration step */ | |
1694 | qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy); | |
1695 | } else { | |
1696 | trace_migration_thread_low_pending(pending_size); | |
1697 | migration_completion(s, current_active_state, | |
1698 | &old_vm_running, &start_time); | |
1699 | break; | |
1700 | } | |
1701 | } | |
1702 | ||
1703 | if (qemu_file_get_error(s->to_dst_file)) { | |
1704 | migrate_set_state(&s->state, current_active_state, | |
1705 | MIGRATION_STATUS_FAILED); | |
1706 | trace_migration_thread_file_err(); | |
1707 | break; | |
1708 | } | |
1709 | current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1710 | if (current_time >= initial_time + BUFFER_DELAY) { | |
1711 | uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) - | |
1712 | initial_bytes; | |
1713 | uint64_t time_spent = current_time - initial_time; | |
1714 | double bandwidth = (double)transferred_bytes / time_spent; | |
1715 | max_size = bandwidth * migrate_max_downtime() / 1000000; | |
1716 | ||
1717 | s->mbps = (((double) transferred_bytes * 8.0) / | |
1718 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; | |
1719 | ||
1720 | trace_migrate_transferred(transferred_bytes, time_spent, | |
1721 | bandwidth, max_size); | |
1722 | /* if we haven't sent anything, we don't want to recalculate | |
1723 | 10000 is a small enough number for our purposes */ | |
1724 | if (s->dirty_bytes_rate && transferred_bytes > 10000) { | |
1725 | s->expected_downtime = s->dirty_bytes_rate / bandwidth; | |
1726 | } | |
1727 | ||
1728 | qemu_file_reset_rate_limit(s->to_dst_file); | |
1729 | initial_time = current_time; | |
1730 | initial_bytes = qemu_ftell(s->to_dst_file); | |
1731 | } | |
1732 | if (qemu_file_rate_limit(s->to_dst_file)) { | |
1733 | /* usleep expects microseconds */ | |
1734 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
1735 | } | |
1736 | } | |
1737 | ||
1738 | trace_migration_thread_after_loop(); | |
1739 | /* If we enabled cpu throttling for auto-converge, turn it off. */ | |
1740 | cpu_throttle_stop(); | |
1741 | end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1742 | ||
1743 | qemu_mutex_lock_iothread(); | |
1744 | qemu_savevm_state_cleanup(); | |
1745 | if (s->state == MIGRATION_STATUS_COMPLETED) { | |
1746 | uint64_t transferred_bytes = qemu_ftell(s->to_dst_file); | |
1747 | s->total_time = end_time - s->total_time; | |
1748 | if (!entered_postcopy) { | |
1749 | s->downtime = end_time - start_time; | |
1750 | } | |
1751 | if (s->total_time) { | |
1752 | s->mbps = (((double) transferred_bytes * 8.0) / | |
1753 | ((double) s->total_time)) / 1000; | |
1754 | } | |
1755 | runstate_set(RUN_STATE_POSTMIGRATE); | |
1756 | } else { | |
1757 | if (old_vm_running && !entered_postcopy) { | |
1758 | vm_start(); | |
1759 | } | |
1760 | } | |
1761 | qemu_bh_schedule(s->cleanup_bh); | |
1762 | qemu_mutex_unlock_iothread(); | |
1763 | ||
1764 | rcu_unregister_thread(); | |
1765 | return NULL; | |
1766 | } | |
1767 | ||
1768 | void migrate_fd_connect(MigrationState *s) | |
1769 | { | |
1770 | /* This is a best 1st approximation. ns to ms */ | |
1771 | s->expected_downtime = max_downtime/1000000; | |
1772 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); | |
1773 | ||
1774 | qemu_file_set_rate_limit(s->to_dst_file, | |
1775 | s->bandwidth_limit / XFER_LIMIT_RATIO); | |
1776 | ||
1777 | /* Notify before starting migration thread */ | |
1778 | notifier_list_notify(&migration_state_notifiers, s); | |
1779 | ||
1780 | /* | |
1781 | * Open the return path; currently for postcopy but other things might | |
1782 | * also want it. | |
1783 | */ | |
1784 | if (migrate_postcopy_ram()) { | |
1785 | if (open_return_path_on_source(s)) { | |
1786 | error_report("Unable to open return-path for postcopy"); | |
1787 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, | |
1788 | MIGRATION_STATUS_FAILED); | |
1789 | migrate_fd_cleanup(s); | |
1790 | return; | |
1791 | } | |
1792 | } | |
1793 | ||
1794 | migrate_compress_threads_create(); | |
1795 | qemu_thread_create(&s->thread, "migration", migration_thread, s, | |
1796 | QEMU_THREAD_JOINABLE); | |
1797 | s->migration_thread_running = true; | |
1798 | } | |
1799 | ||
1800 | PostcopyState postcopy_state_get(void) | |
1801 | { | |
1802 | return atomic_mb_read(&incoming_postcopy_state); | |
1803 | } | |
1804 | ||
1805 | /* Set the state and return the old state */ | |
1806 | PostcopyState postcopy_state_set(PostcopyState new_state) | |
1807 | { | |
1808 | return atomic_xchg(&incoming_postcopy_state, new_state); | |
1809 | } | |
1810 |