]>
Commit | Line | Data |
---|---|---|
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/cutils.h" | |
18 | #include "qemu/error-report.h" | |
19 | #include "qemu/main-loop.h" | |
20 | #include "migration/blocker.h" | |
21 | #include "migration/migration.h" | |
22 | #include "qemu-file-channel.h" | |
23 | #include "migration/qemu-file.h" | |
24 | #include "sysemu/sysemu.h" | |
25 | #include "block/block.h" | |
26 | #include "qapi/qmp/qerror.h" | |
27 | #include "qapi/util.h" | |
28 | #include "qemu/sockets.h" | |
29 | #include "qemu/rcu.h" | |
30 | #include "migration/block.h" | |
31 | #include "postcopy-ram.h" | |
32 | #include "qemu/thread.h" | |
33 | #include "qmp-commands.h" | |
34 | #include "trace.h" | |
35 | #include "qapi-event.h" | |
36 | #include "qom/cpu.h" | |
37 | #include "exec/memory.h" | |
38 | #include "exec/address-spaces.h" | |
39 | #include "io/channel-buffer.h" | |
40 | #include "io/channel-tls.h" | |
41 | #include "migration/colo.h" | |
42 | ||
43 | #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ | |
44 | ||
45 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled | |
46 | * data. */ | |
47 | #define BUFFER_DELAY 100 | |
48 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
49 | ||
50 | /* Time in milliseconds we are allowed to stop the source, | |
51 | * for sending the last part */ | |
52 | #define DEFAULT_MIGRATE_SET_DOWNTIME 300 | |
53 | ||
54 | /* Maximum migrate downtime set to 2000 seconds */ | |
55 | #define MAX_MIGRATE_DOWNTIME_SECONDS 2000 | |
56 | #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000) | |
57 | ||
58 | /* Default compression thread count */ | |
59 | #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 | |
60 | /* Default decompression thread count, usually decompression is at | |
61 | * least 4 times as fast as compression.*/ | |
62 | #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 | |
63 | /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ | |
64 | #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 | |
65 | /* Define default autoconverge cpu throttle migration parameters */ | |
66 | #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20 | |
67 | #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10 | |
68 | ||
69 | /* Migration XBZRLE default cache size */ | |
70 | #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) | |
71 | ||
72 | /* The delay time (in ms) between two COLO checkpoints | |
73 | * Note: Please change this default value to 10000 when we support hybrid mode. | |
74 | */ | |
75 | #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200 | |
76 | ||
77 | static NotifierList migration_state_notifiers = | |
78 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
79 | ||
80 | static bool deferred_incoming; | |
81 | ||
82 | /* When we add fault tolerance, we could have several | |
83 | migrations at once. For now we don't need to add | |
84 | dynamic creation of migration */ | |
85 | ||
86 | /* For outgoing */ | |
87 | MigrationState *migrate_get_current(void) | |
88 | { | |
89 | static bool once; | |
90 | static MigrationState current_migration = { | |
91 | .state = MIGRATION_STATUS_NONE, | |
92 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, | |
93 | .mbps = -1, | |
94 | .parameters = { | |
95 | .compress_level = DEFAULT_MIGRATE_COMPRESS_LEVEL, | |
96 | .compress_threads = DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT, | |
97 | .decompress_threads = DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT, | |
98 | .cpu_throttle_initial = DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL, | |
99 | .cpu_throttle_increment = DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT, | |
100 | .max_bandwidth = MAX_THROTTLE, | |
101 | .downtime_limit = DEFAULT_MIGRATE_SET_DOWNTIME, | |
102 | .x_checkpoint_delay = DEFAULT_MIGRATE_X_CHECKPOINT_DELAY, | |
103 | }, | |
104 | }; | |
105 | ||
106 | if (!once) { | |
107 | current_migration.parameters.tls_creds = g_strdup(""); | |
108 | current_migration.parameters.tls_hostname = g_strdup(""); | |
109 | once = true; | |
110 | } | |
111 | return ¤t_migration; | |
112 | } | |
113 | ||
114 | MigrationIncomingState *migration_incoming_get_current(void) | |
115 | { | |
116 | static bool once; | |
117 | static MigrationIncomingState mis_current; | |
118 | ||
119 | if (!once) { | |
120 | mis_current.state = MIGRATION_STATUS_NONE; | |
121 | memset(&mis_current, 0, sizeof(MigrationIncomingState)); | |
122 | QLIST_INIT(&mis_current.loadvm_handlers); | |
123 | qemu_mutex_init(&mis_current.rp_mutex); | |
124 | qemu_event_init(&mis_current.main_thread_load_event, false); | |
125 | once = true; | |
126 | } | |
127 | return &mis_current; | |
128 | } | |
129 | ||
130 | void migration_incoming_state_destroy(void) | |
131 | { | |
132 | struct MigrationIncomingState *mis = migration_incoming_get_current(); | |
133 | ||
134 | qemu_event_destroy(&mis->main_thread_load_event); | |
135 | loadvm_free_handlers(mis); | |
136 | } | |
137 | ||
138 | ||
139 | typedef struct { | |
140 | bool optional; | |
141 | uint32_t size; | |
142 | uint8_t runstate[100]; | |
143 | RunState state; | |
144 | bool received; | |
145 | } GlobalState; | |
146 | ||
147 | static GlobalState global_state; | |
148 | ||
149 | int global_state_store(void) | |
150 | { | |
151 | if (!runstate_store((char *)global_state.runstate, | |
152 | sizeof(global_state.runstate))) { | |
153 | error_report("runstate name too big: %s", global_state.runstate); | |
154 | trace_migrate_state_too_big(); | |
155 | return -EINVAL; | |
156 | } | |
157 | return 0; | |
158 | } | |
159 | ||
160 | void global_state_store_running(void) | |
161 | { | |
162 | const char *state = RunState_lookup[RUN_STATE_RUNNING]; | |
163 | strncpy((char *)global_state.runstate, | |
164 | state, sizeof(global_state.runstate)); | |
165 | } | |
166 | ||
167 | static bool global_state_received(void) | |
168 | { | |
169 | return global_state.received; | |
170 | } | |
171 | ||
172 | static RunState global_state_get_runstate(void) | |
173 | { | |
174 | return global_state.state; | |
175 | } | |
176 | ||
177 | void global_state_set_optional(void) | |
178 | { | |
179 | global_state.optional = true; | |
180 | } | |
181 | ||
182 | static bool global_state_needed(void *opaque) | |
183 | { | |
184 | GlobalState *s = opaque; | |
185 | char *runstate = (char *)s->runstate; | |
186 | ||
187 | /* If it is not optional, it is mandatory */ | |
188 | ||
189 | if (s->optional == false) { | |
190 | return true; | |
191 | } | |
192 | ||
193 | /* If state is running or paused, it is not needed */ | |
194 | ||
195 | if (strcmp(runstate, "running") == 0 || | |
196 | strcmp(runstate, "paused") == 0) { | |
197 | return false; | |
198 | } | |
199 | ||
200 | /* for any other state it is needed */ | |
201 | return true; | |
202 | } | |
203 | ||
204 | static int global_state_post_load(void *opaque, int version_id) | |
205 | { | |
206 | GlobalState *s = opaque; | |
207 | Error *local_err = NULL; | |
208 | int r; | |
209 | char *runstate = (char *)s->runstate; | |
210 | ||
211 | s->received = true; | |
212 | trace_migrate_global_state_post_load(runstate); | |
213 | ||
214 | r = qapi_enum_parse(RunState_lookup, runstate, RUN_STATE__MAX, | |
215 | -1, &local_err); | |
216 | ||
217 | if (r == -1) { | |
218 | if (local_err) { | |
219 | error_report_err(local_err); | |
220 | } | |
221 | return -EINVAL; | |
222 | } | |
223 | s->state = r; | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static void global_state_pre_save(void *opaque) | |
229 | { | |
230 | GlobalState *s = opaque; | |
231 | ||
232 | trace_migrate_global_state_pre_save((char *)s->runstate); | |
233 | s->size = strlen((char *)s->runstate) + 1; | |
234 | } | |
235 | ||
236 | static const VMStateDescription vmstate_globalstate = { | |
237 | .name = "globalstate", | |
238 | .version_id = 1, | |
239 | .minimum_version_id = 1, | |
240 | .post_load = global_state_post_load, | |
241 | .pre_save = global_state_pre_save, | |
242 | .needed = global_state_needed, | |
243 | .fields = (VMStateField[]) { | |
244 | VMSTATE_UINT32(size, GlobalState), | |
245 | VMSTATE_BUFFER(runstate, GlobalState), | |
246 | VMSTATE_END_OF_LIST() | |
247 | }, | |
248 | }; | |
249 | ||
250 | void register_global_state(void) | |
251 | { | |
252 | /* We would use it independently that we receive it */ | |
253 | strcpy((char *)&global_state.runstate, ""); | |
254 | global_state.received = false; | |
255 | vmstate_register(NULL, 0, &vmstate_globalstate, &global_state); | |
256 | } | |
257 | ||
258 | static void migrate_generate_event(int new_state) | |
259 | { | |
260 | if (migrate_use_events()) { | |
261 | qapi_event_send_migration(new_state, &error_abort); | |
262 | } | |
263 | } | |
264 | ||
265 | /* | |
266 | * Called on -incoming with a defer: uri. | |
267 | * The migration can be started later after any parameters have been | |
268 | * changed. | |
269 | */ | |
270 | static void deferred_incoming_migration(Error **errp) | |
271 | { | |
272 | if (deferred_incoming) { | |
273 | error_setg(errp, "Incoming migration already deferred"); | |
274 | } | |
275 | deferred_incoming = true; | |
276 | } | |
277 | ||
278 | /* Request a range of pages from the source VM at the given | |
279 | * start address. | |
280 | * rbname: Name of the RAMBlock to request the page in, if NULL it's the same | |
281 | * as the last request (a name must have been given previously) | |
282 | * Start: Address offset within the RB | |
283 | * Len: Length in bytes required - must be a multiple of pagesize | |
284 | */ | |
285 | void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname, | |
286 | ram_addr_t start, size_t len) | |
287 | { | |
288 | uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ | |
289 | size_t msglen = 12; /* start + len */ | |
290 | ||
291 | *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); | |
292 | *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); | |
293 | ||
294 | if (rbname) { | |
295 | int rbname_len = strlen(rbname); | |
296 | assert(rbname_len < 256); | |
297 | ||
298 | bufc[msglen++] = rbname_len; | |
299 | memcpy(bufc + msglen, rbname, rbname_len); | |
300 | msglen += rbname_len; | |
301 | migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc); | |
302 | } else { | |
303 | migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc); | |
304 | } | |
305 | } | |
306 | ||
307 | void qemu_start_incoming_migration(const char *uri, Error **errp) | |
308 | { | |
309 | const char *p; | |
310 | ||
311 | qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort); | |
312 | if (!strcmp(uri, "defer")) { | |
313 | deferred_incoming_migration(errp); | |
314 | } else if (strstart(uri, "tcp:", &p)) { | |
315 | tcp_start_incoming_migration(p, errp); | |
316 | #ifdef CONFIG_RDMA | |
317 | } else if (strstart(uri, "rdma:", &p)) { | |
318 | rdma_start_incoming_migration(p, errp); | |
319 | #endif | |
320 | } else if (strstart(uri, "exec:", &p)) { | |
321 | exec_start_incoming_migration(p, errp); | |
322 | } else if (strstart(uri, "unix:", &p)) { | |
323 | unix_start_incoming_migration(p, errp); | |
324 | } else if (strstart(uri, "fd:", &p)) { | |
325 | fd_start_incoming_migration(p, errp); | |
326 | } else { | |
327 | error_setg(errp, "unknown migration protocol: %s", uri); | |
328 | } | |
329 | } | |
330 | ||
331 | static void process_incoming_migration_bh(void *opaque) | |
332 | { | |
333 | Error *local_err = NULL; | |
334 | MigrationIncomingState *mis = opaque; | |
335 | ||
336 | /* Make sure all file formats flush their mutable metadata. | |
337 | * If we get an error here, just don't restart the VM yet. */ | |
338 | bdrv_invalidate_cache_all(&local_err); | |
339 | if (local_err) { | |
340 | error_report_err(local_err); | |
341 | local_err = NULL; | |
342 | autostart = false; | |
343 | } | |
344 | ||
345 | /* | |
346 | * This must happen after all error conditions are dealt with and | |
347 | * we're sure the VM is going to be running on this host. | |
348 | */ | |
349 | qemu_announce_self(); | |
350 | ||
351 | /* If global state section was not received or we are in running | |
352 | state, we need to obey autostart. Any other state is set with | |
353 | runstate_set. */ | |
354 | ||
355 | if (!global_state_received() || | |
356 | global_state_get_runstate() == RUN_STATE_RUNNING) { | |
357 | if (autostart) { | |
358 | vm_start(); | |
359 | } else { | |
360 | runstate_set(RUN_STATE_PAUSED); | |
361 | } | |
362 | } else { | |
363 | runstate_set(global_state_get_runstate()); | |
364 | } | |
365 | migrate_decompress_threads_join(); | |
366 | /* | |
367 | * This must happen after any state changes since as soon as an external | |
368 | * observer sees this event they might start to prod at the VM assuming | |
369 | * it's ready to use. | |
370 | */ | |
371 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
372 | MIGRATION_STATUS_COMPLETED); | |
373 | qemu_bh_delete(mis->bh); | |
374 | migration_incoming_state_destroy(); | |
375 | } | |
376 | ||
377 | static void process_incoming_migration_co(void *opaque) | |
378 | { | |
379 | QEMUFile *f = opaque; | |
380 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
381 | PostcopyState ps; | |
382 | int ret; | |
383 | ||
384 | mis->from_src_file = f; | |
385 | mis->largest_page_size = qemu_ram_pagesize_largest(); | |
386 | postcopy_state_set(POSTCOPY_INCOMING_NONE); | |
387 | migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, | |
388 | MIGRATION_STATUS_ACTIVE); | |
389 | ret = qemu_loadvm_state(f); | |
390 | ||
391 | ps = postcopy_state_get(); | |
392 | trace_process_incoming_migration_co_end(ret, ps); | |
393 | if (ps != POSTCOPY_INCOMING_NONE) { | |
394 | if (ps == POSTCOPY_INCOMING_ADVISE) { | |
395 | /* | |
396 | * Where a migration had postcopy enabled (and thus went to advise) | |
397 | * but managed to complete within the precopy period, we can use | |
398 | * the normal exit. | |
399 | */ | |
400 | postcopy_ram_incoming_cleanup(mis); | |
401 | } else if (ret >= 0) { | |
402 | /* | |
403 | * Postcopy was started, cleanup should happen at the end of the | |
404 | * postcopy thread. | |
405 | */ | |
406 | trace_process_incoming_migration_co_postcopy_end_main(); | |
407 | return; | |
408 | } | |
409 | /* Else if something went wrong then just fall out of the normal exit */ | |
410 | } | |
411 | ||
412 | /* we get COLO info, and know if we are in COLO mode */ | |
413 | if (!ret && migration_incoming_enable_colo()) { | |
414 | mis->migration_incoming_co = qemu_coroutine_self(); | |
415 | qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming", | |
416 | colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE); | |
417 | mis->have_colo_incoming_thread = true; | |
418 | qemu_coroutine_yield(); | |
419 | ||
420 | /* Wait checkpoint incoming thread exit before free resource */ | |
421 | qemu_thread_join(&mis->colo_incoming_thread); | |
422 | } | |
423 | ||
424 | if (ret < 0) { | |
425 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
426 | MIGRATION_STATUS_FAILED); | |
427 | error_report("load of migration failed: %s", strerror(-ret)); | |
428 | migrate_decompress_threads_join(); | |
429 | exit(EXIT_FAILURE); | |
430 | } | |
431 | ||
432 | qemu_fclose(f); | |
433 | free_xbzrle_decoded_buf(); | |
434 | ||
435 | mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); | |
436 | qemu_bh_schedule(mis->bh); | |
437 | } | |
438 | ||
439 | void migration_fd_process_incoming(QEMUFile *f) | |
440 | { | |
441 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, f); | |
442 | ||
443 | migrate_decompress_threads_create(); | |
444 | qemu_file_set_blocking(f, false); | |
445 | qemu_coroutine_enter(co); | |
446 | } | |
447 | ||
448 | /* | |
449 | * Send a message on the return channel back to the source | |
450 | * of the migration. | |
451 | */ | |
452 | void migrate_send_rp_message(MigrationIncomingState *mis, | |
453 | enum mig_rp_message_type message_type, | |
454 | uint16_t len, void *data) | |
455 | { | |
456 | trace_migrate_send_rp_message((int)message_type, len); | |
457 | qemu_mutex_lock(&mis->rp_mutex); | |
458 | qemu_put_be16(mis->to_src_file, (unsigned int)message_type); | |
459 | qemu_put_be16(mis->to_src_file, len); | |
460 | qemu_put_buffer(mis->to_src_file, data, len); | |
461 | qemu_fflush(mis->to_src_file); | |
462 | qemu_mutex_unlock(&mis->rp_mutex); | |
463 | } | |
464 | ||
465 | /* | |
466 | * Send a 'SHUT' message on the return channel with the given value | |
467 | * to indicate that we've finished with the RP. Non-0 value indicates | |
468 | * error. | |
469 | */ | |
470 | void migrate_send_rp_shut(MigrationIncomingState *mis, | |
471 | uint32_t value) | |
472 | { | |
473 | uint32_t buf; | |
474 | ||
475 | buf = cpu_to_be32(value); | |
476 | migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); | |
477 | } | |
478 | ||
479 | /* | |
480 | * Send a 'PONG' message on the return channel with the given value | |
481 | * (normally in response to a 'PING') | |
482 | */ | |
483 | void migrate_send_rp_pong(MigrationIncomingState *mis, | |
484 | uint32_t value) | |
485 | { | |
486 | uint32_t buf; | |
487 | ||
488 | buf = cpu_to_be32(value); | |
489 | migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); | |
490 | } | |
491 | ||
492 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) | |
493 | { | |
494 | MigrationCapabilityStatusList *head = NULL; | |
495 | MigrationCapabilityStatusList *caps; | |
496 | MigrationState *s = migrate_get_current(); | |
497 | int i; | |
498 | ||
499 | caps = NULL; /* silence compiler warning */ | |
500 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { | |
501 | #ifndef CONFIG_LIVE_BLOCK_MIGRATION | |
502 | if (i == MIGRATION_CAPABILITY_BLOCK) { | |
503 | continue; | |
504 | } | |
505 | #endif | |
506 | if (i == MIGRATION_CAPABILITY_X_COLO && !colo_supported()) { | |
507 | continue; | |
508 | } | |
509 | if (head == NULL) { | |
510 | head = g_malloc0(sizeof(*caps)); | |
511 | caps = head; | |
512 | } else { | |
513 | caps->next = g_malloc0(sizeof(*caps)); | |
514 | caps = caps->next; | |
515 | } | |
516 | caps->value = | |
517 | g_malloc(sizeof(*caps->value)); | |
518 | caps->value->capability = i; | |
519 | caps->value->state = s->enabled_capabilities[i]; | |
520 | } | |
521 | ||
522 | return head; | |
523 | } | |
524 | ||
525 | MigrationParameters *qmp_query_migrate_parameters(Error **errp) | |
526 | { | |
527 | MigrationParameters *params; | |
528 | MigrationState *s = migrate_get_current(); | |
529 | ||
530 | params = g_malloc0(sizeof(*params)); | |
531 | params->has_compress_level = true; | |
532 | params->compress_level = s->parameters.compress_level; | |
533 | params->has_compress_threads = true; | |
534 | params->compress_threads = s->parameters.compress_threads; | |
535 | params->has_decompress_threads = true; | |
536 | params->decompress_threads = s->parameters.decompress_threads; | |
537 | params->has_cpu_throttle_initial = true; | |
538 | params->cpu_throttle_initial = s->parameters.cpu_throttle_initial; | |
539 | params->has_cpu_throttle_increment = true; | |
540 | params->cpu_throttle_increment = s->parameters.cpu_throttle_increment; | |
541 | params->has_tls_creds = !!s->parameters.tls_creds; | |
542 | params->tls_creds = g_strdup(s->parameters.tls_creds); | |
543 | params->has_tls_hostname = !!s->parameters.tls_hostname; | |
544 | params->tls_hostname = g_strdup(s->parameters.tls_hostname); | |
545 | params->has_max_bandwidth = true; | |
546 | params->max_bandwidth = s->parameters.max_bandwidth; | |
547 | params->has_downtime_limit = true; | |
548 | params->downtime_limit = s->parameters.downtime_limit; | |
549 | params->has_x_checkpoint_delay = true; | |
550 | params->x_checkpoint_delay = s->parameters.x_checkpoint_delay; | |
551 | params->has_block_incremental = true; | |
552 | params->block_incremental = s->parameters.block_incremental; | |
553 | ||
554 | return params; | |
555 | } | |
556 | ||
557 | /* | |
558 | * Return true if we're already in the middle of a migration | |
559 | * (i.e. any of the active or setup states) | |
560 | */ | |
561 | static bool migration_is_setup_or_active(int state) | |
562 | { | |
563 | switch (state) { | |
564 | case MIGRATION_STATUS_ACTIVE: | |
565 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
566 | case MIGRATION_STATUS_SETUP: | |
567 | return true; | |
568 | ||
569 | default: | |
570 | return false; | |
571 | ||
572 | } | |
573 | } | |
574 | ||
575 | static void get_xbzrle_cache_stats(MigrationInfo *info) | |
576 | { | |
577 | if (migrate_use_xbzrle()) { | |
578 | info->has_xbzrle_cache = true; | |
579 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
580 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
581 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
582 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
583 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
584 | info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate(); | |
585 | info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); | |
586 | } | |
587 | } | |
588 | ||
589 | static void populate_ram_info(MigrationInfo *info, MigrationState *s) | |
590 | { | |
591 | info->has_ram = true; | |
592 | info->ram = g_malloc0(sizeof(*info->ram)); | |
593 | info->ram->transferred = ram_bytes_transferred(); | |
594 | info->ram->total = ram_bytes_total(); | |
595 | info->ram->duplicate = dup_mig_pages_transferred(); | |
596 | /* legacy value. It is not used anymore */ | |
597 | info->ram->skipped = 0; | |
598 | info->ram->normal = norm_mig_pages_transferred(); | |
599 | info->ram->normal_bytes = norm_mig_pages_transferred() * | |
600 | qemu_target_page_size(); | |
601 | info->ram->mbps = s->mbps; | |
602 | info->ram->dirty_sync_count = ram_dirty_sync_count(); | |
603 | info->ram->postcopy_requests = ram_postcopy_requests(); | |
604 | info->ram->page_size = qemu_target_page_size(); | |
605 | ||
606 | if (s->state != MIGRATION_STATUS_COMPLETED) { | |
607 | info->ram->remaining = ram_bytes_remaining(); | |
608 | info->ram->dirty_pages_rate = ram_dirty_pages_rate(); | |
609 | } | |
610 | } | |
611 | ||
612 | MigrationInfo *qmp_query_migrate(Error **errp) | |
613 | { | |
614 | MigrationInfo *info = g_malloc0(sizeof(*info)); | |
615 | MigrationState *s = migrate_get_current(); | |
616 | ||
617 | switch (s->state) { | |
618 | case MIGRATION_STATUS_NONE: | |
619 | /* no migration has happened ever */ | |
620 | break; | |
621 | case MIGRATION_STATUS_SETUP: | |
622 | info->has_status = true; | |
623 | info->has_total_time = false; | |
624 | break; | |
625 | case MIGRATION_STATUS_ACTIVE: | |
626 | case MIGRATION_STATUS_CANCELLING: | |
627 | info->has_status = true; | |
628 | info->has_total_time = true; | |
629 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
630 | - s->total_time; | |
631 | info->has_expected_downtime = true; | |
632 | info->expected_downtime = s->expected_downtime; | |
633 | info->has_setup_time = true; | |
634 | info->setup_time = s->setup_time; | |
635 | ||
636 | populate_ram_info(info, s); | |
637 | ||
638 | if (blk_mig_active()) { | |
639 | info->has_disk = true; | |
640 | info->disk = g_malloc0(sizeof(*info->disk)); | |
641 | info->disk->transferred = blk_mig_bytes_transferred(); | |
642 | info->disk->remaining = blk_mig_bytes_remaining(); | |
643 | info->disk->total = blk_mig_bytes_total(); | |
644 | } | |
645 | ||
646 | if (cpu_throttle_active()) { | |
647 | info->has_cpu_throttle_percentage = true; | |
648 | info->cpu_throttle_percentage = cpu_throttle_get_percentage(); | |
649 | } | |
650 | ||
651 | get_xbzrle_cache_stats(info); | |
652 | break; | |
653 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
654 | /* Mostly the same as active; TODO add some postcopy stats */ | |
655 | info->has_status = true; | |
656 | info->has_total_time = true; | |
657 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
658 | - s->total_time; | |
659 | info->has_expected_downtime = true; | |
660 | info->expected_downtime = s->expected_downtime; | |
661 | info->has_setup_time = true; | |
662 | info->setup_time = s->setup_time; | |
663 | ||
664 | populate_ram_info(info, s); | |
665 | ||
666 | if (blk_mig_active()) { | |
667 | info->has_disk = true; | |
668 | info->disk = g_malloc0(sizeof(*info->disk)); | |
669 | info->disk->transferred = blk_mig_bytes_transferred(); | |
670 | info->disk->remaining = blk_mig_bytes_remaining(); | |
671 | info->disk->total = blk_mig_bytes_total(); | |
672 | } | |
673 | ||
674 | get_xbzrle_cache_stats(info); | |
675 | break; | |
676 | case MIGRATION_STATUS_COLO: | |
677 | info->has_status = true; | |
678 | /* TODO: display COLO specific information (checkpoint info etc.) */ | |
679 | break; | |
680 | case MIGRATION_STATUS_COMPLETED: | |
681 | get_xbzrle_cache_stats(info); | |
682 | ||
683 | info->has_status = true; | |
684 | info->has_total_time = true; | |
685 | info->total_time = s->total_time; | |
686 | info->has_downtime = true; | |
687 | info->downtime = s->downtime; | |
688 | info->has_setup_time = true; | |
689 | info->setup_time = s->setup_time; | |
690 | ||
691 | populate_ram_info(info, s); | |
692 | break; | |
693 | case MIGRATION_STATUS_FAILED: | |
694 | info->has_status = true; | |
695 | if (s->error) { | |
696 | info->has_error_desc = true; | |
697 | info->error_desc = g_strdup(error_get_pretty(s->error)); | |
698 | } | |
699 | break; | |
700 | case MIGRATION_STATUS_CANCELLED: | |
701 | info->has_status = true; | |
702 | break; | |
703 | } | |
704 | info->status = s->state; | |
705 | ||
706 | return info; | |
707 | } | |
708 | ||
709 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, | |
710 | Error **errp) | |
711 | { | |
712 | MigrationState *s = migrate_get_current(); | |
713 | MigrationCapabilityStatusList *cap; | |
714 | bool old_postcopy_cap = migrate_postcopy_ram(); | |
715 | ||
716 | if (migration_is_setup_or_active(s->state)) { | |
717 | error_setg(errp, QERR_MIGRATION_ACTIVE); | |
718 | return; | |
719 | } | |
720 | ||
721 | for (cap = params; cap; cap = cap->next) { | |
722 | #ifndef CONFIG_LIVE_BLOCK_MIGRATION | |
723 | if (cap->value->capability == MIGRATION_CAPABILITY_BLOCK | |
724 | && cap->value->state) { | |
725 | error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) " | |
726 | "block migration"); | |
727 | error_append_hint(errp, "Use drive_mirror+NBD instead.\n"); | |
728 | continue; | |
729 | } | |
730 | #endif | |
731 | if (cap->value->capability == MIGRATION_CAPABILITY_X_COLO) { | |
732 | if (!colo_supported()) { | |
733 | error_setg(errp, "COLO is not currently supported, please" | |
734 | " configure with --enable-colo option in order to" | |
735 | " support COLO feature"); | |
736 | continue; | |
737 | } | |
738 | } | |
739 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
740 | } | |
741 | ||
742 | if (migrate_postcopy_ram()) { | |
743 | if (migrate_use_compression()) { | |
744 | /* The decompression threads asynchronously write into RAM | |
745 | * rather than use the atomic copies needed to avoid | |
746 | * userfaulting. It should be possible to fix the decompression | |
747 | * threads for compatibility in future. | |
748 | */ | |
749 | error_report("Postcopy is not currently compatible with " | |
750 | "compression"); | |
751 | s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = | |
752 | false; | |
753 | } | |
754 | /* This check is reasonably expensive, so only when it's being | |
755 | * set the first time, also it's only the destination that needs | |
756 | * special support. | |
757 | */ | |
758 | if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) && | |
759 | !postcopy_ram_supported_by_host()) { | |
760 | /* postcopy_ram_supported_by_host will have emitted a more | |
761 | * detailed message | |
762 | */ | |
763 | error_report("Postcopy is not supported"); | |
764 | s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = | |
765 | false; | |
766 | } | |
767 | } | |
768 | } | |
769 | ||
770 | void qmp_migrate_set_parameters(MigrationParameters *params, Error **errp) | |
771 | { | |
772 | MigrationState *s = migrate_get_current(); | |
773 | ||
774 | if (params->has_compress_level && | |
775 | (params->compress_level < 0 || params->compress_level > 9)) { | |
776 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level", | |
777 | "is invalid, it should be in the range of 0 to 9"); | |
778 | return; | |
779 | } | |
780 | if (params->has_compress_threads && | |
781 | (params->compress_threads < 1 || params->compress_threads > 255)) { | |
782 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
783 | "compress_threads", | |
784 | "is invalid, it should be in the range of 1 to 255"); | |
785 | return; | |
786 | } | |
787 | if (params->has_decompress_threads && | |
788 | (params->decompress_threads < 1 || params->decompress_threads > 255)) { | |
789 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
790 | "decompress_threads", | |
791 | "is invalid, it should be in the range of 1 to 255"); | |
792 | return; | |
793 | } | |
794 | if (params->has_cpu_throttle_initial && | |
795 | (params->cpu_throttle_initial < 1 || | |
796 | params->cpu_throttle_initial > 99)) { | |
797 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
798 | "cpu_throttle_initial", | |
799 | "an integer in the range of 1 to 99"); | |
800 | return; | |
801 | } | |
802 | if (params->has_cpu_throttle_increment && | |
803 | (params->cpu_throttle_increment < 1 || | |
804 | params->cpu_throttle_increment > 99)) { | |
805 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
806 | "cpu_throttle_increment", | |
807 | "an integer in the range of 1 to 99"); | |
808 | return; | |
809 | } | |
810 | if (params->has_max_bandwidth && | |
811 | (params->max_bandwidth < 0 || params->max_bandwidth > SIZE_MAX)) { | |
812 | error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the" | |
813 | " range of 0 to %zu bytes/second", SIZE_MAX); | |
814 | return; | |
815 | } | |
816 | if (params->has_downtime_limit && | |
817 | (params->downtime_limit < 0 || | |
818 | params->downtime_limit > MAX_MIGRATE_DOWNTIME)) { | |
819 | error_setg(errp, "Parameter 'downtime_limit' expects an integer in " | |
820 | "the range of 0 to %d milliseconds", | |
821 | MAX_MIGRATE_DOWNTIME); | |
822 | return; | |
823 | } | |
824 | if (params->has_x_checkpoint_delay && (params->x_checkpoint_delay < 0)) { | |
825 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
826 | "x_checkpoint_delay", | |
827 | "is invalid, it should be positive"); | |
828 | } | |
829 | ||
830 | if (params->has_compress_level) { | |
831 | s->parameters.compress_level = params->compress_level; | |
832 | } | |
833 | if (params->has_compress_threads) { | |
834 | s->parameters.compress_threads = params->compress_threads; | |
835 | } | |
836 | if (params->has_decompress_threads) { | |
837 | s->parameters.decompress_threads = params->decompress_threads; | |
838 | } | |
839 | if (params->has_cpu_throttle_initial) { | |
840 | s->parameters.cpu_throttle_initial = params->cpu_throttle_initial; | |
841 | } | |
842 | if (params->has_cpu_throttle_increment) { | |
843 | s->parameters.cpu_throttle_increment = params->cpu_throttle_increment; | |
844 | } | |
845 | if (params->has_tls_creds) { | |
846 | g_free(s->parameters.tls_creds); | |
847 | s->parameters.tls_creds = g_strdup(params->tls_creds); | |
848 | } | |
849 | if (params->has_tls_hostname) { | |
850 | g_free(s->parameters.tls_hostname); | |
851 | s->parameters.tls_hostname = g_strdup(params->tls_hostname); | |
852 | } | |
853 | if (params->has_max_bandwidth) { | |
854 | s->parameters.max_bandwidth = params->max_bandwidth; | |
855 | if (s->to_dst_file) { | |
856 | qemu_file_set_rate_limit(s->to_dst_file, | |
857 | s->parameters.max_bandwidth / XFER_LIMIT_RATIO); | |
858 | } | |
859 | } | |
860 | if (params->has_downtime_limit) { | |
861 | s->parameters.downtime_limit = params->downtime_limit; | |
862 | } | |
863 | ||
864 | if (params->has_x_checkpoint_delay) { | |
865 | s->parameters.x_checkpoint_delay = params->x_checkpoint_delay; | |
866 | if (migration_in_colo_state()) { | |
867 | colo_checkpoint_notify(s); | |
868 | } | |
869 | } | |
870 | if (params->has_block_incremental) { | |
871 | s->parameters.block_incremental = params->block_incremental; | |
872 | } | |
873 | } | |
874 | ||
875 | ||
876 | void qmp_migrate_start_postcopy(Error **errp) | |
877 | { | |
878 | MigrationState *s = migrate_get_current(); | |
879 | ||
880 | if (!migrate_postcopy_ram()) { | |
881 | error_setg(errp, "Enable postcopy with migrate_set_capability before" | |
882 | " the start of migration"); | |
883 | return; | |
884 | } | |
885 | ||
886 | if (s->state == MIGRATION_STATUS_NONE) { | |
887 | error_setg(errp, "Postcopy must be started after migration has been" | |
888 | " started"); | |
889 | return; | |
890 | } | |
891 | /* | |
892 | * we don't error if migration has finished since that would be racy | |
893 | * with issuing this command. | |
894 | */ | |
895 | atomic_set(&s->start_postcopy, true); | |
896 | } | |
897 | ||
898 | /* shared migration helpers */ | |
899 | ||
900 | void migrate_set_state(int *state, int old_state, int new_state) | |
901 | { | |
902 | if (atomic_cmpxchg(state, old_state, new_state) == old_state) { | |
903 | trace_migrate_set_state(new_state); | |
904 | migrate_generate_event(new_state); | |
905 | } | |
906 | } | |
907 | ||
908 | void migrate_set_block_enabled(bool value, Error **errp) | |
909 | { | |
910 | MigrationCapabilityStatusList *cap; | |
911 | ||
912 | cap = g_new0(MigrationCapabilityStatusList, 1); | |
913 | cap->value = g_new0(MigrationCapabilityStatus, 1); | |
914 | cap->value->capability = MIGRATION_CAPABILITY_BLOCK; | |
915 | cap->value->state = value; | |
916 | qmp_migrate_set_capabilities(cap, errp); | |
917 | qapi_free_MigrationCapabilityStatusList(cap); | |
918 | } | |
919 | ||
920 | static void migrate_set_block_incremental(MigrationState *s, bool value) | |
921 | { | |
922 | s->parameters.block_incremental = value; | |
923 | } | |
924 | ||
925 | static void block_cleanup_parameters(MigrationState *s) | |
926 | { | |
927 | if (s->must_remove_block_options) { | |
928 | /* setting to false can never fail */ | |
929 | migrate_set_block_enabled(false, &error_abort); | |
930 | migrate_set_block_incremental(s, false); | |
931 | s->must_remove_block_options = false; | |
932 | } | |
933 | } | |
934 | ||
935 | static void migrate_fd_cleanup(void *opaque) | |
936 | { | |
937 | MigrationState *s = opaque; | |
938 | ||
939 | qemu_bh_delete(s->cleanup_bh); | |
940 | s->cleanup_bh = NULL; | |
941 | ||
942 | migration_page_queue_free(); | |
943 | ||
944 | if (s->to_dst_file) { | |
945 | trace_migrate_fd_cleanup(); | |
946 | qemu_mutex_unlock_iothread(); | |
947 | if (s->migration_thread_running) { | |
948 | qemu_thread_join(&s->thread); | |
949 | s->migration_thread_running = false; | |
950 | } | |
951 | qemu_mutex_lock_iothread(); | |
952 | ||
953 | migrate_compress_threads_join(); | |
954 | qemu_fclose(s->to_dst_file); | |
955 | s->to_dst_file = NULL; | |
956 | } | |
957 | ||
958 | assert((s->state != MIGRATION_STATUS_ACTIVE) && | |
959 | (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE)); | |
960 | ||
961 | if (s->state == MIGRATION_STATUS_CANCELLING) { | |
962 | migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, | |
963 | MIGRATION_STATUS_CANCELLED); | |
964 | } | |
965 | ||
966 | notifier_list_notify(&migration_state_notifiers, s); | |
967 | block_cleanup_parameters(s); | |
968 | } | |
969 | ||
970 | void migrate_fd_error(MigrationState *s, const Error *error) | |
971 | { | |
972 | trace_migrate_fd_error(error_get_pretty(error)); | |
973 | assert(s->to_dst_file == NULL); | |
974 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, | |
975 | MIGRATION_STATUS_FAILED); | |
976 | if (!s->error) { | |
977 | s->error = error_copy(error); | |
978 | } | |
979 | notifier_list_notify(&migration_state_notifiers, s); | |
980 | block_cleanup_parameters(s); | |
981 | } | |
982 | ||
983 | static void migrate_fd_cancel(MigrationState *s) | |
984 | { | |
985 | int old_state ; | |
986 | QEMUFile *f = migrate_get_current()->to_dst_file; | |
987 | trace_migrate_fd_cancel(); | |
988 | ||
989 | if (s->rp_state.from_dst_file) { | |
990 | /* shutdown the rp socket, so causing the rp thread to shutdown */ | |
991 | qemu_file_shutdown(s->rp_state.from_dst_file); | |
992 | } | |
993 | ||
994 | do { | |
995 | old_state = s->state; | |
996 | if (!migration_is_setup_or_active(old_state)) { | |
997 | break; | |
998 | } | |
999 | migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); | |
1000 | } while (s->state != MIGRATION_STATUS_CANCELLING); | |
1001 | ||
1002 | /* | |
1003 | * If we're unlucky the migration code might be stuck somewhere in a | |
1004 | * send/write while the network has failed and is waiting to timeout; | |
1005 | * if we've got shutdown(2) available then we can force it to quit. | |
1006 | * The outgoing qemu file gets closed in migrate_fd_cleanup that is | |
1007 | * called in a bh, so there is no race against this cancel. | |
1008 | */ | |
1009 | if (s->state == MIGRATION_STATUS_CANCELLING && f) { | |
1010 | qemu_file_shutdown(f); | |
1011 | } | |
1012 | if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) { | |
1013 | Error *local_err = NULL; | |
1014 | ||
1015 | bdrv_invalidate_cache_all(&local_err); | |
1016 | if (local_err) { | |
1017 | error_report_err(local_err); | |
1018 | } else { | |
1019 | s->block_inactive = false; | |
1020 | } | |
1021 | } | |
1022 | block_cleanup_parameters(s); | |
1023 | } | |
1024 | ||
1025 | void add_migration_state_change_notifier(Notifier *notify) | |
1026 | { | |
1027 | notifier_list_add(&migration_state_notifiers, notify); | |
1028 | } | |
1029 | ||
1030 | void remove_migration_state_change_notifier(Notifier *notify) | |
1031 | { | |
1032 | notifier_remove(notify); | |
1033 | } | |
1034 | ||
1035 | bool migration_in_setup(MigrationState *s) | |
1036 | { | |
1037 | return s->state == MIGRATION_STATUS_SETUP; | |
1038 | } | |
1039 | ||
1040 | bool migration_has_finished(MigrationState *s) | |
1041 | { | |
1042 | return s->state == MIGRATION_STATUS_COMPLETED; | |
1043 | } | |
1044 | ||
1045 | bool migration_has_failed(MigrationState *s) | |
1046 | { | |
1047 | return (s->state == MIGRATION_STATUS_CANCELLED || | |
1048 | s->state == MIGRATION_STATUS_FAILED); | |
1049 | } | |
1050 | ||
1051 | bool migration_in_postcopy(void) | |
1052 | { | |
1053 | MigrationState *s = migrate_get_current(); | |
1054 | ||
1055 | return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
1056 | } | |
1057 | ||
1058 | bool migration_in_postcopy_after_devices(MigrationState *s) | |
1059 | { | |
1060 | return migration_in_postcopy() && s->postcopy_after_devices; | |
1061 | } | |
1062 | ||
1063 | bool migration_is_idle(void) | |
1064 | { | |
1065 | MigrationState *s = migrate_get_current(); | |
1066 | ||
1067 | switch (s->state) { | |
1068 | case MIGRATION_STATUS_NONE: | |
1069 | case MIGRATION_STATUS_CANCELLED: | |
1070 | case MIGRATION_STATUS_COMPLETED: | |
1071 | case MIGRATION_STATUS_FAILED: | |
1072 | return true; | |
1073 | case MIGRATION_STATUS_SETUP: | |
1074 | case MIGRATION_STATUS_CANCELLING: | |
1075 | case MIGRATION_STATUS_ACTIVE: | |
1076 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
1077 | case MIGRATION_STATUS_COLO: | |
1078 | return false; | |
1079 | case MIGRATION_STATUS__MAX: | |
1080 | g_assert_not_reached(); | |
1081 | } | |
1082 | ||
1083 | return false; | |
1084 | } | |
1085 | ||
1086 | MigrationState *migrate_init(void) | |
1087 | { | |
1088 | MigrationState *s = migrate_get_current(); | |
1089 | ||
1090 | /* | |
1091 | * Reinitialise all migration state, except | |
1092 | * parameters/capabilities that the user set, and | |
1093 | * locks. | |
1094 | */ | |
1095 | s->bytes_xfer = 0; | |
1096 | s->xfer_limit = 0; | |
1097 | s->cleanup_bh = 0; | |
1098 | s->to_dst_file = NULL; | |
1099 | s->state = MIGRATION_STATUS_NONE; | |
1100 | s->rp_state.from_dst_file = NULL; | |
1101 | s->rp_state.error = false; | |
1102 | s->mbps = 0.0; | |
1103 | s->downtime = 0; | |
1104 | s->expected_downtime = 0; | |
1105 | s->setup_time = 0; | |
1106 | s->start_postcopy = false; | |
1107 | s->postcopy_after_devices = false; | |
1108 | s->migration_thread_running = false; | |
1109 | error_free(s->error); | |
1110 | s->error = NULL; | |
1111 | ||
1112 | migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); | |
1113 | ||
1114 | s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1115 | return s; | |
1116 | } | |
1117 | ||
1118 | static GSList *migration_blockers; | |
1119 | ||
1120 | int migrate_add_blocker(Error *reason, Error **errp) | |
1121 | { | |
1122 | if (only_migratable) { | |
1123 | error_propagate(errp, error_copy(reason)); | |
1124 | error_prepend(errp, "disallowing migration blocker " | |
1125 | "(--only_migratable) for: "); | |
1126 | return -EACCES; | |
1127 | } | |
1128 | ||
1129 | if (migration_is_idle()) { | |
1130 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | error_propagate(errp, error_copy(reason)); | |
1135 | error_prepend(errp, "disallowing migration blocker (migration in " | |
1136 | "progress) for: "); | |
1137 | return -EBUSY; | |
1138 | } | |
1139 | ||
1140 | void migrate_del_blocker(Error *reason) | |
1141 | { | |
1142 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
1143 | } | |
1144 | ||
1145 | void qmp_migrate_incoming(const char *uri, Error **errp) | |
1146 | { | |
1147 | Error *local_err = NULL; | |
1148 | static bool once = true; | |
1149 | ||
1150 | if (!deferred_incoming) { | |
1151 | error_setg(errp, "For use with '-incoming defer'"); | |
1152 | return; | |
1153 | } | |
1154 | if (!once) { | |
1155 | error_setg(errp, "The incoming migration has already been started"); | |
1156 | } | |
1157 | ||
1158 | qemu_start_incoming_migration(uri, &local_err); | |
1159 | ||
1160 | if (local_err) { | |
1161 | error_propagate(errp, local_err); | |
1162 | return; | |
1163 | } | |
1164 | ||
1165 | once = false; | |
1166 | } | |
1167 | ||
1168 | bool migration_is_blocked(Error **errp) | |
1169 | { | |
1170 | if (qemu_savevm_state_blocked(errp)) { | |
1171 | return true; | |
1172 | } | |
1173 | ||
1174 | if (migration_blockers) { | |
1175 | *errp = error_copy(migration_blockers->data); | |
1176 | return true; | |
1177 | } | |
1178 | ||
1179 | return false; | |
1180 | } | |
1181 | ||
1182 | void qmp_migrate(const char *uri, bool has_blk, bool blk, | |
1183 | bool has_inc, bool inc, bool has_detach, bool detach, | |
1184 | Error **errp) | |
1185 | { | |
1186 | Error *local_err = NULL; | |
1187 | MigrationState *s = migrate_get_current(); | |
1188 | const char *p; | |
1189 | ||
1190 | if (migration_is_setup_or_active(s->state) || | |
1191 | s->state == MIGRATION_STATUS_CANCELLING || | |
1192 | s->state == MIGRATION_STATUS_COLO) { | |
1193 | error_setg(errp, QERR_MIGRATION_ACTIVE); | |
1194 | return; | |
1195 | } | |
1196 | if (runstate_check(RUN_STATE_INMIGRATE)) { | |
1197 | error_setg(errp, "Guest is waiting for an incoming migration"); | |
1198 | return; | |
1199 | } | |
1200 | ||
1201 | if (migration_is_blocked(errp)) { | |
1202 | return; | |
1203 | } | |
1204 | ||
1205 | if ((has_blk && blk) || (has_inc && inc)) { | |
1206 | if (migrate_use_block() || migrate_use_block_incremental()) { | |
1207 | error_setg(errp, "Command options are incompatible with " | |
1208 | "current migration capabilities"); | |
1209 | return; | |
1210 | } | |
1211 | migrate_set_block_enabled(true, &local_err); | |
1212 | if (local_err) { | |
1213 | error_propagate(errp, local_err); | |
1214 | return; | |
1215 | } | |
1216 | s->must_remove_block_options = true; | |
1217 | } | |
1218 | ||
1219 | if (has_inc && inc) { | |
1220 | migrate_set_block_incremental(s, true); | |
1221 | } | |
1222 | ||
1223 | s = migrate_init(); | |
1224 | ||
1225 | if (strstart(uri, "tcp:", &p)) { | |
1226 | tcp_start_outgoing_migration(s, p, &local_err); | |
1227 | #ifdef CONFIG_RDMA | |
1228 | } else if (strstart(uri, "rdma:", &p)) { | |
1229 | rdma_start_outgoing_migration(s, p, &local_err); | |
1230 | #endif | |
1231 | } else if (strstart(uri, "exec:", &p)) { | |
1232 | exec_start_outgoing_migration(s, p, &local_err); | |
1233 | } else if (strstart(uri, "unix:", &p)) { | |
1234 | unix_start_outgoing_migration(s, p, &local_err); | |
1235 | } else if (strstart(uri, "fd:", &p)) { | |
1236 | fd_start_outgoing_migration(s, p, &local_err); | |
1237 | } else { | |
1238 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri", | |
1239 | "a valid migration protocol"); | |
1240 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, | |
1241 | MIGRATION_STATUS_FAILED); | |
1242 | return; | |
1243 | } | |
1244 | ||
1245 | if (local_err) { | |
1246 | migrate_fd_error(s, local_err); | |
1247 | error_propagate(errp, local_err); | |
1248 | return; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | void qmp_migrate_cancel(Error **errp) | |
1253 | { | |
1254 | migrate_fd_cancel(migrate_get_current()); | |
1255 | } | |
1256 | ||
1257 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) | |
1258 | { | |
1259 | MigrationState *s = migrate_get_current(); | |
1260 | int64_t new_size; | |
1261 | ||
1262 | /* Check for truncation */ | |
1263 | if (value != (size_t)value) { | |
1264 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
1265 | "exceeding address space"); | |
1266 | return; | |
1267 | } | |
1268 | ||
1269 | /* Cache should not be larger than guest ram size */ | |
1270 | if (value > ram_bytes_total()) { | |
1271 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
1272 | "exceeds guest ram size "); | |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | new_size = xbzrle_cache_resize(value); | |
1277 | if (new_size < 0) { | |
1278 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
1279 | "is smaller than page size"); | |
1280 | return; | |
1281 | } | |
1282 | ||
1283 | s->xbzrle_cache_size = new_size; | |
1284 | } | |
1285 | ||
1286 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
1287 | { | |
1288 | return migrate_xbzrle_cache_size(); | |
1289 | } | |
1290 | ||
1291 | void qmp_migrate_set_speed(int64_t value, Error **errp) | |
1292 | { | |
1293 | MigrationParameters p = { | |
1294 | .has_max_bandwidth = true, | |
1295 | .max_bandwidth = value, | |
1296 | }; | |
1297 | ||
1298 | qmp_migrate_set_parameters(&p, errp); | |
1299 | } | |
1300 | ||
1301 | void qmp_migrate_set_downtime(double value, Error **errp) | |
1302 | { | |
1303 | if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) { | |
1304 | error_setg(errp, "Parameter 'downtime_limit' expects an integer in " | |
1305 | "the range of 0 to %d seconds", | |
1306 | MAX_MIGRATE_DOWNTIME_SECONDS); | |
1307 | return; | |
1308 | } | |
1309 | ||
1310 | value *= 1000; /* Convert to milliseconds */ | |
1311 | value = MAX(0, MIN(INT64_MAX, value)); | |
1312 | ||
1313 | MigrationParameters p = { | |
1314 | .has_downtime_limit = true, | |
1315 | .downtime_limit = value, | |
1316 | }; | |
1317 | ||
1318 | qmp_migrate_set_parameters(&p, errp); | |
1319 | } | |
1320 | ||
1321 | bool migrate_release_ram(void) | |
1322 | { | |
1323 | MigrationState *s; | |
1324 | ||
1325 | s = migrate_get_current(); | |
1326 | ||
1327 | return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM]; | |
1328 | } | |
1329 | ||
1330 | bool migrate_postcopy_ram(void) | |
1331 | { | |
1332 | MigrationState *s; | |
1333 | ||
1334 | s = migrate_get_current(); | |
1335 | ||
1336 | return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM]; | |
1337 | } | |
1338 | ||
1339 | bool migrate_auto_converge(void) | |
1340 | { | |
1341 | MigrationState *s; | |
1342 | ||
1343 | s = migrate_get_current(); | |
1344 | ||
1345 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; | |
1346 | } | |
1347 | ||
1348 | bool migrate_zero_blocks(void) | |
1349 | { | |
1350 | MigrationState *s; | |
1351 | ||
1352 | s = migrate_get_current(); | |
1353 | ||
1354 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; | |
1355 | } | |
1356 | ||
1357 | bool migrate_use_compression(void) | |
1358 | { | |
1359 | MigrationState *s; | |
1360 | ||
1361 | s = migrate_get_current(); | |
1362 | ||
1363 | return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS]; | |
1364 | } | |
1365 | ||
1366 | int migrate_compress_level(void) | |
1367 | { | |
1368 | MigrationState *s; | |
1369 | ||
1370 | s = migrate_get_current(); | |
1371 | ||
1372 | return s->parameters.compress_level; | |
1373 | } | |
1374 | ||
1375 | int migrate_compress_threads(void) | |
1376 | { | |
1377 | MigrationState *s; | |
1378 | ||
1379 | s = migrate_get_current(); | |
1380 | ||
1381 | return s->parameters.compress_threads; | |
1382 | } | |
1383 | ||
1384 | int migrate_decompress_threads(void) | |
1385 | { | |
1386 | MigrationState *s; | |
1387 | ||
1388 | s = migrate_get_current(); | |
1389 | ||
1390 | return s->parameters.decompress_threads; | |
1391 | } | |
1392 | ||
1393 | bool migrate_use_events(void) | |
1394 | { | |
1395 | MigrationState *s; | |
1396 | ||
1397 | s = migrate_get_current(); | |
1398 | ||
1399 | return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS]; | |
1400 | } | |
1401 | ||
1402 | int migrate_use_xbzrle(void) | |
1403 | { | |
1404 | MigrationState *s; | |
1405 | ||
1406 | s = migrate_get_current(); | |
1407 | ||
1408 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
1409 | } | |
1410 | ||
1411 | int64_t migrate_xbzrle_cache_size(void) | |
1412 | { | |
1413 | MigrationState *s; | |
1414 | ||
1415 | s = migrate_get_current(); | |
1416 | ||
1417 | return s->xbzrle_cache_size; | |
1418 | } | |
1419 | ||
1420 | bool migrate_use_block(void) | |
1421 | { | |
1422 | MigrationState *s; | |
1423 | ||
1424 | s = migrate_get_current(); | |
1425 | ||
1426 | return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK]; | |
1427 | } | |
1428 | ||
1429 | bool migrate_use_block_incremental(void) | |
1430 | { | |
1431 | MigrationState *s; | |
1432 | ||
1433 | s = migrate_get_current(); | |
1434 | ||
1435 | return s->parameters.block_incremental; | |
1436 | } | |
1437 | ||
1438 | /* migration thread support */ | |
1439 | /* | |
1440 | * Something bad happened to the RP stream, mark an error | |
1441 | * The caller shall print or trace something to indicate why | |
1442 | */ | |
1443 | static void mark_source_rp_bad(MigrationState *s) | |
1444 | { | |
1445 | s->rp_state.error = true; | |
1446 | } | |
1447 | ||
1448 | static struct rp_cmd_args { | |
1449 | ssize_t len; /* -1 = variable */ | |
1450 | const char *name; | |
1451 | } rp_cmd_args[] = { | |
1452 | [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, | |
1453 | [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, | |
1454 | [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, | |
1455 | [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, | |
1456 | [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, | |
1457 | [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, | |
1458 | }; | |
1459 | ||
1460 | /* | |
1461 | * Process a request for pages received on the return path, | |
1462 | * We're allowed to send more than requested (e.g. to round to our page size) | |
1463 | * and we don't need to send pages that have already been sent. | |
1464 | */ | |
1465 | static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, | |
1466 | ram_addr_t start, size_t len) | |
1467 | { | |
1468 | long our_host_ps = getpagesize(); | |
1469 | ||
1470 | trace_migrate_handle_rp_req_pages(rbname, start, len); | |
1471 | ||
1472 | /* | |
1473 | * Since we currently insist on matching page sizes, just sanity check | |
1474 | * we're being asked for whole host pages. | |
1475 | */ | |
1476 | if (start & (our_host_ps-1) || | |
1477 | (len & (our_host_ps-1))) { | |
1478 | error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT | |
1479 | " len: %zd", __func__, start, len); | |
1480 | mark_source_rp_bad(ms); | |
1481 | return; | |
1482 | } | |
1483 | ||
1484 | if (ram_save_queue_pages(rbname, start, len)) { | |
1485 | mark_source_rp_bad(ms); | |
1486 | } | |
1487 | } | |
1488 | ||
1489 | /* | |
1490 | * Handles messages sent on the return path towards the source VM | |
1491 | * | |
1492 | */ | |
1493 | static void *source_return_path_thread(void *opaque) | |
1494 | { | |
1495 | MigrationState *ms = opaque; | |
1496 | QEMUFile *rp = ms->rp_state.from_dst_file; | |
1497 | uint16_t header_len, header_type; | |
1498 | uint8_t buf[512]; | |
1499 | uint32_t tmp32, sibling_error; | |
1500 | ram_addr_t start = 0; /* =0 to silence warning */ | |
1501 | size_t len = 0, expected_len; | |
1502 | int res; | |
1503 | ||
1504 | trace_source_return_path_thread_entry(); | |
1505 | while (!ms->rp_state.error && !qemu_file_get_error(rp) && | |
1506 | migration_is_setup_or_active(ms->state)) { | |
1507 | trace_source_return_path_thread_loop_top(); | |
1508 | header_type = qemu_get_be16(rp); | |
1509 | header_len = qemu_get_be16(rp); | |
1510 | ||
1511 | if (header_type >= MIG_RP_MSG_MAX || | |
1512 | header_type == MIG_RP_MSG_INVALID) { | |
1513 | error_report("RP: Received invalid message 0x%04x length 0x%04x", | |
1514 | header_type, header_len); | |
1515 | mark_source_rp_bad(ms); | |
1516 | goto out; | |
1517 | } | |
1518 | ||
1519 | if ((rp_cmd_args[header_type].len != -1 && | |
1520 | header_len != rp_cmd_args[header_type].len) || | |
1521 | header_len > sizeof(buf)) { | |
1522 | error_report("RP: Received '%s' message (0x%04x) with" | |
1523 | "incorrect length %d expecting %zu", | |
1524 | rp_cmd_args[header_type].name, header_type, header_len, | |
1525 | (size_t)rp_cmd_args[header_type].len); | |
1526 | mark_source_rp_bad(ms); | |
1527 | goto out; | |
1528 | } | |
1529 | ||
1530 | /* We know we've got a valid header by this point */ | |
1531 | res = qemu_get_buffer(rp, buf, header_len); | |
1532 | if (res != header_len) { | |
1533 | error_report("RP: Failed reading data for message 0x%04x" | |
1534 | " read %d expected %d", | |
1535 | header_type, res, header_len); | |
1536 | mark_source_rp_bad(ms); | |
1537 | goto out; | |
1538 | } | |
1539 | ||
1540 | /* OK, we have the message and the data */ | |
1541 | switch (header_type) { | |
1542 | case MIG_RP_MSG_SHUT: | |
1543 | sibling_error = ldl_be_p(buf); | |
1544 | trace_source_return_path_thread_shut(sibling_error); | |
1545 | if (sibling_error) { | |
1546 | error_report("RP: Sibling indicated error %d", sibling_error); | |
1547 | mark_source_rp_bad(ms); | |
1548 | } | |
1549 | /* | |
1550 | * We'll let the main thread deal with closing the RP | |
1551 | * we could do a shutdown(2) on it, but we're the only user | |
1552 | * anyway, so there's nothing gained. | |
1553 | */ | |
1554 | goto out; | |
1555 | ||
1556 | case MIG_RP_MSG_PONG: | |
1557 | tmp32 = ldl_be_p(buf); | |
1558 | trace_source_return_path_thread_pong(tmp32); | |
1559 | break; | |
1560 | ||
1561 | case MIG_RP_MSG_REQ_PAGES: | |
1562 | start = ldq_be_p(buf); | |
1563 | len = ldl_be_p(buf + 8); | |
1564 | migrate_handle_rp_req_pages(ms, NULL, start, len); | |
1565 | break; | |
1566 | ||
1567 | case MIG_RP_MSG_REQ_PAGES_ID: | |
1568 | expected_len = 12 + 1; /* header + termination */ | |
1569 | ||
1570 | if (header_len >= expected_len) { | |
1571 | start = ldq_be_p(buf); | |
1572 | len = ldl_be_p(buf + 8); | |
1573 | /* Now we expect an idstr */ | |
1574 | tmp32 = buf[12]; /* Length of the following idstr */ | |
1575 | buf[13 + tmp32] = '\0'; | |
1576 | expected_len += tmp32; | |
1577 | } | |
1578 | if (header_len != expected_len) { | |
1579 | error_report("RP: Req_Page_id with length %d expecting %zd", | |
1580 | header_len, expected_len); | |
1581 | mark_source_rp_bad(ms); | |
1582 | goto out; | |
1583 | } | |
1584 | migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); | |
1585 | break; | |
1586 | ||
1587 | default: | |
1588 | break; | |
1589 | } | |
1590 | } | |
1591 | if (qemu_file_get_error(rp)) { | |
1592 | trace_source_return_path_thread_bad_end(); | |
1593 | mark_source_rp_bad(ms); | |
1594 | } | |
1595 | ||
1596 | trace_source_return_path_thread_end(); | |
1597 | out: | |
1598 | ms->rp_state.from_dst_file = NULL; | |
1599 | qemu_fclose(rp); | |
1600 | return NULL; | |
1601 | } | |
1602 | ||
1603 | static int open_return_path_on_source(MigrationState *ms) | |
1604 | { | |
1605 | ||
1606 | ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); | |
1607 | if (!ms->rp_state.from_dst_file) { | |
1608 | return -1; | |
1609 | } | |
1610 | ||
1611 | trace_open_return_path_on_source(); | |
1612 | qemu_thread_create(&ms->rp_state.rp_thread, "return path", | |
1613 | source_return_path_thread, ms, QEMU_THREAD_JOINABLE); | |
1614 | ||
1615 | trace_open_return_path_on_source_continue(); | |
1616 | ||
1617 | return 0; | |
1618 | } | |
1619 | ||
1620 | /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ | |
1621 | static int await_return_path_close_on_source(MigrationState *ms) | |
1622 | { | |
1623 | /* | |
1624 | * If this is a normal exit then the destination will send a SHUT and the | |
1625 | * rp_thread will exit, however if there's an error we need to cause | |
1626 | * it to exit. | |
1627 | */ | |
1628 | if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) { | |
1629 | /* | |
1630 | * shutdown(2), if we have it, will cause it to unblock if it's stuck | |
1631 | * waiting for the destination. | |
1632 | */ | |
1633 | qemu_file_shutdown(ms->rp_state.from_dst_file); | |
1634 | mark_source_rp_bad(ms); | |
1635 | } | |
1636 | trace_await_return_path_close_on_source_joining(); | |
1637 | qemu_thread_join(&ms->rp_state.rp_thread); | |
1638 | trace_await_return_path_close_on_source_close(); | |
1639 | return ms->rp_state.error; | |
1640 | } | |
1641 | ||
1642 | /* | |
1643 | * Switch from normal iteration to postcopy | |
1644 | * Returns non-0 on error | |
1645 | */ | |
1646 | static int postcopy_start(MigrationState *ms, bool *old_vm_running) | |
1647 | { | |
1648 | int ret; | |
1649 | QIOChannelBuffer *bioc; | |
1650 | QEMUFile *fb; | |
1651 | int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1652 | bool restart_block = false; | |
1653 | migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, | |
1654 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
1655 | ||
1656 | trace_postcopy_start(); | |
1657 | qemu_mutex_lock_iothread(); | |
1658 | trace_postcopy_start_set_run(); | |
1659 | ||
1660 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
1661 | *old_vm_running = runstate_is_running(); | |
1662 | global_state_store(); | |
1663 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
1664 | if (ret < 0) { | |
1665 | goto fail; | |
1666 | } | |
1667 | ||
1668 | ret = bdrv_inactivate_all(); | |
1669 | if (ret < 0) { | |
1670 | goto fail; | |
1671 | } | |
1672 | restart_block = true; | |
1673 | ||
1674 | /* | |
1675 | * Cause any non-postcopiable, but iterative devices to | |
1676 | * send out their final data. | |
1677 | */ | |
1678 | qemu_savevm_state_complete_precopy(ms->to_dst_file, true); | |
1679 | ||
1680 | /* | |
1681 | * in Finish migrate and with the io-lock held everything should | |
1682 | * be quiet, but we've potentially still got dirty pages and we | |
1683 | * need to tell the destination to throw any pages it's already received | |
1684 | * that are dirty | |
1685 | */ | |
1686 | if (ram_postcopy_send_discard_bitmap(ms)) { | |
1687 | error_report("postcopy send discard bitmap failed"); | |
1688 | goto fail; | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * send rest of state - note things that are doing postcopy | |
1693 | * will notice we're in POSTCOPY_ACTIVE and not actually | |
1694 | * wrap their state up here | |
1695 | */ | |
1696 | qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX); | |
1697 | /* Ping just for debugging, helps line traces up */ | |
1698 | qemu_savevm_send_ping(ms->to_dst_file, 2); | |
1699 | ||
1700 | /* | |
1701 | * While loading the device state we may trigger page transfer | |
1702 | * requests and the fd must be free to process those, and thus | |
1703 | * the destination must read the whole device state off the fd before | |
1704 | * it starts processing it. Unfortunately the ad-hoc migration format | |
1705 | * doesn't allow the destination to know the size to read without fully | |
1706 | * parsing it through each devices load-state code (especially the open | |
1707 | * coded devices that use get/put). | |
1708 | * So we wrap the device state up in a package with a length at the start; | |
1709 | * to do this we use a qemu_buf to hold the whole of the device state. | |
1710 | */ | |
1711 | bioc = qio_channel_buffer_new(4096); | |
1712 | qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer"); | |
1713 | fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc)); | |
1714 | object_unref(OBJECT(bioc)); | |
1715 | ||
1716 | /* | |
1717 | * Make sure the receiver can get incoming pages before we send the rest | |
1718 | * of the state | |
1719 | */ | |
1720 | qemu_savevm_send_postcopy_listen(fb); | |
1721 | ||
1722 | qemu_savevm_state_complete_precopy(fb, false); | |
1723 | qemu_savevm_send_ping(fb, 3); | |
1724 | ||
1725 | qemu_savevm_send_postcopy_run(fb); | |
1726 | ||
1727 | /* <><> end of stuff going into the package */ | |
1728 | ||
1729 | /* Last point of recovery; as soon as we send the package the destination | |
1730 | * can open devices and potentially start running. | |
1731 | * Lets just check again we've not got any errors. | |
1732 | */ | |
1733 | ret = qemu_file_get_error(ms->to_dst_file); | |
1734 | if (ret) { | |
1735 | error_report("postcopy_start: Migration stream errored (pre package)"); | |
1736 | goto fail_closefb; | |
1737 | } | |
1738 | ||
1739 | restart_block = false; | |
1740 | ||
1741 | /* Now send that blob */ | |
1742 | if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) { | |
1743 | goto fail_closefb; | |
1744 | } | |
1745 | qemu_fclose(fb); | |
1746 | ||
1747 | /* Send a notify to give a chance for anything that needs to happen | |
1748 | * at the transition to postcopy and after the device state; in particular | |
1749 | * spice needs to trigger a transition now | |
1750 | */ | |
1751 | ms->postcopy_after_devices = true; | |
1752 | notifier_list_notify(&migration_state_notifiers, ms); | |
1753 | ||
1754 | ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop; | |
1755 | ||
1756 | qemu_mutex_unlock_iothread(); | |
1757 | ||
1758 | /* | |
1759 | * Although this ping is just for debug, it could potentially be | |
1760 | * used for getting a better measurement of downtime at the source. | |
1761 | */ | |
1762 | qemu_savevm_send_ping(ms->to_dst_file, 4); | |
1763 | ||
1764 | if (migrate_release_ram()) { | |
1765 | ram_postcopy_migrated_memory_release(ms); | |
1766 | } | |
1767 | ||
1768 | ret = qemu_file_get_error(ms->to_dst_file); | |
1769 | if (ret) { | |
1770 | error_report("postcopy_start: Migration stream errored"); | |
1771 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, | |
1772 | MIGRATION_STATUS_FAILED); | |
1773 | } | |
1774 | ||
1775 | return ret; | |
1776 | ||
1777 | fail_closefb: | |
1778 | qemu_fclose(fb); | |
1779 | fail: | |
1780 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, | |
1781 | MIGRATION_STATUS_FAILED); | |
1782 | if (restart_block) { | |
1783 | /* A failure happened early enough that we know the destination hasn't | |
1784 | * accessed block devices, so we're safe to recover. | |
1785 | */ | |
1786 | Error *local_err = NULL; | |
1787 | ||
1788 | bdrv_invalidate_cache_all(&local_err); | |
1789 | if (local_err) { | |
1790 | error_report_err(local_err); | |
1791 | } | |
1792 | } | |
1793 | qemu_mutex_unlock_iothread(); | |
1794 | return -1; | |
1795 | } | |
1796 | ||
1797 | /** | |
1798 | * migration_completion: Used by migration_thread when there's not much left. | |
1799 | * The caller 'breaks' the loop when this returns. | |
1800 | * | |
1801 | * @s: Current migration state | |
1802 | * @current_active_state: The migration state we expect to be in | |
1803 | * @*old_vm_running: Pointer to old_vm_running flag | |
1804 | * @*start_time: Pointer to time to update | |
1805 | */ | |
1806 | static void migration_completion(MigrationState *s, int current_active_state, | |
1807 | bool *old_vm_running, | |
1808 | int64_t *start_time) | |
1809 | { | |
1810 | int ret; | |
1811 | ||
1812 | if (s->state == MIGRATION_STATUS_ACTIVE) { | |
1813 | qemu_mutex_lock_iothread(); | |
1814 | *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1815 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
1816 | *old_vm_running = runstate_is_running(); | |
1817 | ret = global_state_store(); | |
1818 | ||
1819 | if (!ret) { | |
1820 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
1821 | /* | |
1822 | * Don't mark the image with BDRV_O_INACTIVE flag if | |
1823 | * we will go into COLO stage later. | |
1824 | */ | |
1825 | if (ret >= 0 && !migrate_colo_enabled()) { | |
1826 | ret = bdrv_inactivate_all(); | |
1827 | } | |
1828 | if (ret >= 0) { | |
1829 | qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); | |
1830 | qemu_savevm_state_complete_precopy(s->to_dst_file, false); | |
1831 | s->block_inactive = true; | |
1832 | } | |
1833 | } | |
1834 | qemu_mutex_unlock_iothread(); | |
1835 | ||
1836 | if (ret < 0) { | |
1837 | goto fail; | |
1838 | } | |
1839 | } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1840 | trace_migration_completion_postcopy_end(); | |
1841 | ||
1842 | qemu_savevm_state_complete_postcopy(s->to_dst_file); | |
1843 | trace_migration_completion_postcopy_end_after_complete(); | |
1844 | } | |
1845 | ||
1846 | /* | |
1847 | * If rp was opened we must clean up the thread before | |
1848 | * cleaning everything else up (since if there are no failures | |
1849 | * it will wait for the destination to send it's status in | |
1850 | * a SHUT command). | |
1851 | * Postcopy opens rp if enabled (even if it's not avtivated) | |
1852 | */ | |
1853 | if (migrate_postcopy_ram()) { | |
1854 | int rp_error; | |
1855 | trace_migration_completion_postcopy_end_before_rp(); | |
1856 | rp_error = await_return_path_close_on_source(s); | |
1857 | trace_migration_completion_postcopy_end_after_rp(rp_error); | |
1858 | if (rp_error) { | |
1859 | goto fail_invalidate; | |
1860 | } | |
1861 | } | |
1862 | ||
1863 | if (qemu_file_get_error(s->to_dst_file)) { | |
1864 | trace_migration_completion_file_err(); | |
1865 | goto fail_invalidate; | |
1866 | } | |
1867 | ||
1868 | if (!migrate_colo_enabled()) { | |
1869 | migrate_set_state(&s->state, current_active_state, | |
1870 | MIGRATION_STATUS_COMPLETED); | |
1871 | } | |
1872 | ||
1873 | return; | |
1874 | ||
1875 | fail_invalidate: | |
1876 | /* If not doing postcopy, vm_start() will be called: let's regain | |
1877 | * control on images. | |
1878 | */ | |
1879 | if (s->state == MIGRATION_STATUS_ACTIVE) { | |
1880 | Error *local_err = NULL; | |
1881 | ||
1882 | qemu_mutex_lock_iothread(); | |
1883 | bdrv_invalidate_cache_all(&local_err); | |
1884 | if (local_err) { | |
1885 | error_report_err(local_err); | |
1886 | } else { | |
1887 | s->block_inactive = false; | |
1888 | } | |
1889 | qemu_mutex_unlock_iothread(); | |
1890 | } | |
1891 | ||
1892 | fail: | |
1893 | migrate_set_state(&s->state, current_active_state, | |
1894 | MIGRATION_STATUS_FAILED); | |
1895 | } | |
1896 | ||
1897 | bool migrate_colo_enabled(void) | |
1898 | { | |
1899 | MigrationState *s = migrate_get_current(); | |
1900 | return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO]; | |
1901 | } | |
1902 | ||
1903 | /* | |
1904 | * Master migration thread on the source VM. | |
1905 | * It drives the migration and pumps the data down the outgoing channel. | |
1906 | */ | |
1907 | static void *migration_thread(void *opaque) | |
1908 | { | |
1909 | MigrationState *s = opaque; | |
1910 | /* Used by the bandwidth calcs, updated later */ | |
1911 | int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1912 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); | |
1913 | int64_t initial_bytes = 0; | |
1914 | /* | |
1915 | * The final stage happens when the remaining data is smaller than | |
1916 | * this threshold; it's calculated from the requested downtime and | |
1917 | * measured bandwidth | |
1918 | */ | |
1919 | int64_t threshold_size = 0; | |
1920 | int64_t start_time = initial_time; | |
1921 | int64_t end_time; | |
1922 | bool old_vm_running = false; | |
1923 | bool entered_postcopy = false; | |
1924 | /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */ | |
1925 | enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE; | |
1926 | bool enable_colo = migrate_colo_enabled(); | |
1927 | ||
1928 | rcu_register_thread(); | |
1929 | ||
1930 | qemu_savevm_state_header(s->to_dst_file); | |
1931 | ||
1932 | if (migrate_postcopy_ram()) { | |
1933 | /* Now tell the dest that it should open its end so it can reply */ | |
1934 | qemu_savevm_send_open_return_path(s->to_dst_file); | |
1935 | ||
1936 | /* And do a ping that will make stuff easier to debug */ | |
1937 | qemu_savevm_send_ping(s->to_dst_file, 1); | |
1938 | ||
1939 | /* | |
1940 | * Tell the destination that we *might* want to do postcopy later; | |
1941 | * if the other end can't do postcopy it should fail now, nice and | |
1942 | * early. | |
1943 | */ | |
1944 | qemu_savevm_send_postcopy_advise(s->to_dst_file); | |
1945 | } | |
1946 | ||
1947 | qemu_savevm_state_begin(s->to_dst_file); | |
1948 | ||
1949 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; | |
1950 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, | |
1951 | MIGRATION_STATUS_ACTIVE); | |
1952 | ||
1953 | trace_migration_thread_setup_complete(); | |
1954 | ||
1955 | while (s->state == MIGRATION_STATUS_ACTIVE || | |
1956 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1957 | int64_t current_time; | |
1958 | uint64_t pending_size; | |
1959 | ||
1960 | if (!qemu_file_rate_limit(s->to_dst_file)) { | |
1961 | uint64_t pend_post, pend_nonpost; | |
1962 | ||
1963 | qemu_savevm_state_pending(s->to_dst_file, threshold_size, | |
1964 | &pend_nonpost, &pend_post); | |
1965 | pending_size = pend_nonpost + pend_post; | |
1966 | trace_migrate_pending(pending_size, threshold_size, | |
1967 | pend_post, pend_nonpost); | |
1968 | if (pending_size && pending_size >= threshold_size) { | |
1969 | /* Still a significant amount to transfer */ | |
1970 | ||
1971 | if (migrate_postcopy_ram() && | |
1972 | s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE && | |
1973 | pend_nonpost <= threshold_size && | |
1974 | atomic_read(&s->start_postcopy)) { | |
1975 | ||
1976 | if (!postcopy_start(s, &old_vm_running)) { | |
1977 | current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE; | |
1978 | entered_postcopy = true; | |
1979 | } | |
1980 | ||
1981 | continue; | |
1982 | } | |
1983 | /* Just another iteration step */ | |
1984 | qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy); | |
1985 | } else { | |
1986 | trace_migration_thread_low_pending(pending_size); | |
1987 | migration_completion(s, current_active_state, | |
1988 | &old_vm_running, &start_time); | |
1989 | break; | |
1990 | } | |
1991 | } | |
1992 | ||
1993 | if (qemu_file_get_error(s->to_dst_file)) { | |
1994 | migrate_set_state(&s->state, current_active_state, | |
1995 | MIGRATION_STATUS_FAILED); | |
1996 | trace_migration_thread_file_err(); | |
1997 | break; | |
1998 | } | |
1999 | current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
2000 | if (current_time >= initial_time + BUFFER_DELAY) { | |
2001 | uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) - | |
2002 | initial_bytes; | |
2003 | uint64_t time_spent = current_time - initial_time; | |
2004 | double bandwidth = (double)transferred_bytes / time_spent; | |
2005 | threshold_size = bandwidth * s->parameters.downtime_limit; | |
2006 | ||
2007 | s->mbps = (((double) transferred_bytes * 8.0) / | |
2008 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; | |
2009 | ||
2010 | trace_migrate_transferred(transferred_bytes, time_spent, | |
2011 | bandwidth, threshold_size); | |
2012 | /* if we haven't sent anything, we don't want to recalculate | |
2013 | 10000 is a small enough number for our purposes */ | |
2014 | if (ram_dirty_pages_rate() && transferred_bytes > 10000) { | |
2015 | s->expected_downtime = ram_dirty_pages_rate() * | |
2016 | qemu_target_page_size() / bandwidth; | |
2017 | } | |
2018 | ||
2019 | qemu_file_reset_rate_limit(s->to_dst_file); | |
2020 | initial_time = current_time; | |
2021 | initial_bytes = qemu_ftell(s->to_dst_file); | |
2022 | } | |
2023 | if (qemu_file_rate_limit(s->to_dst_file)) { | |
2024 | /* usleep expects microseconds */ | |
2025 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
2026 | } | |
2027 | } | |
2028 | ||
2029 | trace_migration_thread_after_loop(); | |
2030 | /* If we enabled cpu throttling for auto-converge, turn it off. */ | |
2031 | cpu_throttle_stop(); | |
2032 | end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
2033 | ||
2034 | qemu_mutex_lock_iothread(); | |
2035 | /* | |
2036 | * The resource has been allocated by migration will be reused in COLO | |
2037 | * process, so don't release them. | |
2038 | */ | |
2039 | if (!enable_colo) { | |
2040 | qemu_savevm_state_cleanup(); | |
2041 | } | |
2042 | if (s->state == MIGRATION_STATUS_COMPLETED) { | |
2043 | uint64_t transferred_bytes = qemu_ftell(s->to_dst_file); | |
2044 | s->total_time = end_time - s->total_time; | |
2045 | if (!entered_postcopy) { | |
2046 | s->downtime = end_time - start_time; | |
2047 | } | |
2048 | if (s->total_time) { | |
2049 | s->mbps = (((double) transferred_bytes * 8.0) / | |
2050 | ((double) s->total_time)) / 1000; | |
2051 | } | |
2052 | runstate_set(RUN_STATE_POSTMIGRATE); | |
2053 | } else { | |
2054 | if (s->state == MIGRATION_STATUS_ACTIVE && enable_colo) { | |
2055 | migrate_start_colo_process(s); | |
2056 | qemu_savevm_state_cleanup(); | |
2057 | /* | |
2058 | * Fixme: we will run VM in COLO no matter its old running state. | |
2059 | * After exited COLO, we will keep running. | |
2060 | */ | |
2061 | old_vm_running = true; | |
2062 | } | |
2063 | if (old_vm_running && !entered_postcopy) { | |
2064 | vm_start(); | |
2065 | } else { | |
2066 | if (runstate_check(RUN_STATE_FINISH_MIGRATE)) { | |
2067 | runstate_set(RUN_STATE_POSTMIGRATE); | |
2068 | } | |
2069 | } | |
2070 | } | |
2071 | qemu_bh_schedule(s->cleanup_bh); | |
2072 | qemu_mutex_unlock_iothread(); | |
2073 | ||
2074 | rcu_unregister_thread(); | |
2075 | return NULL; | |
2076 | } | |
2077 | ||
2078 | void migrate_fd_connect(MigrationState *s) | |
2079 | { | |
2080 | s->expected_downtime = s->parameters.downtime_limit; | |
2081 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); | |
2082 | ||
2083 | qemu_file_set_blocking(s->to_dst_file, true); | |
2084 | qemu_file_set_rate_limit(s->to_dst_file, | |
2085 | s->parameters.max_bandwidth / XFER_LIMIT_RATIO); | |
2086 | ||
2087 | /* Notify before starting migration thread */ | |
2088 | notifier_list_notify(&migration_state_notifiers, s); | |
2089 | ||
2090 | /* | |
2091 | * Open the return path; currently for postcopy but other things might | |
2092 | * also want it. | |
2093 | */ | |
2094 | if (migrate_postcopy_ram()) { | |
2095 | if (open_return_path_on_source(s)) { | |
2096 | error_report("Unable to open return-path for postcopy"); | |
2097 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, | |
2098 | MIGRATION_STATUS_FAILED); | |
2099 | migrate_fd_cleanup(s); | |
2100 | return; | |
2101 | } | |
2102 | } | |
2103 | ||
2104 | migrate_compress_threads_create(); | |
2105 | qemu_thread_create(&s->thread, "live_migration", migration_thread, s, | |
2106 | QEMU_THREAD_JOINABLE); | |
2107 | s->migration_thread_running = true; | |
2108 | } | |
2109 |