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Commit | Line | Data |
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5bb7910a AL |
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 | * | |
6b620ca3 PB |
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. | |
5bb7910a AL |
14 | */ |
15 | ||
16 | #include "qemu-common.h" | |
d49b6836 | 17 | #include "qemu/error-report.h" |
6a1751b7 | 18 | #include "qemu/main-loop.h" |
caf71f86 | 19 | #include "migration/migration.h" |
0d82d0e8 | 20 | #include "migration/qemu-file.h" |
9c17d615 | 21 | #include "sysemu/sysemu.h" |
737e150e | 22 | #include "block/block.h" |
cc7a8ea7 | 23 | #include "qapi/qmp/qerror.h" |
1de7afc9 | 24 | #include "qemu/sockets.h" |
ab28bd23 | 25 | #include "qemu/rcu.h" |
caf71f86 | 26 | #include "migration/block.h" |
e0b266f0 | 27 | #include "migration/postcopy-ram.h" |
766bd176 | 28 | #include "qemu/thread.h" |
791e7c82 | 29 | #include "qmp-commands.h" |
c09e5bb1 | 30 | #include "trace.h" |
df4b1024 | 31 | #include "qapi/util.h" |
598cd2bd | 32 | #include "qapi-event.h" |
070afca2 | 33 | #include "qom/cpu.h" |
065e2813 | 34 | |
dc325627 | 35 | #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ |
5bb7910a | 36 | |
5b4e1eb7 JQ |
37 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled |
38 | * data. */ | |
39 | #define BUFFER_DELAY 100 | |
40 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
41 | ||
8706d2d5 LL |
42 | /* Default compression thread count */ |
43 | #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 | |
3fcb38c2 LL |
44 | /* Default decompression thread count, usually decompression is at |
45 | * least 4 times as fast as compression.*/ | |
46 | #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 | |
8706d2d5 LL |
47 | /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ |
48 | #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 | |
1626fee3 JH |
49 | /* Define default autoconverge cpu throttle migration parameters */ |
50 | #define DEFAULT_MIGRATE_X_CPU_THROTTLE_INITIAL 20 | |
51 | #define DEFAULT_MIGRATE_X_CPU_THROTTLE_INCREMENT 10 | |
8706d2d5 | 52 | |
17ad9b35 OW |
53 | /* Migration XBZRLE default cache size */ |
54 | #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) | |
55 | ||
99a0db9b GH |
56 | static NotifierList migration_state_notifiers = |
57 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
58 | ||
adde220a DDAG |
59 | static bool deferred_incoming; |
60 | ||
093e3c42 DDAG |
61 | /* |
62 | * Current state of incoming postcopy; note this is not part of | |
63 | * MigrationIncomingState since it's state is used during cleanup | |
64 | * at the end as MIS is being freed. | |
65 | */ | |
66 | static PostcopyState incoming_postcopy_state; | |
67 | ||
17549e84 JQ |
68 | /* When we add fault tolerance, we could have several |
69 | migrations at once. For now we don't need to add | |
70 | dynamic creation of migration */ | |
71 | ||
bca7856a | 72 | /* For outgoing */ |
859bc756 | 73 | MigrationState *migrate_get_current(void) |
17549e84 JQ |
74 | { |
75 | static MigrationState current_migration = { | |
31194731 | 76 | .state = MIGRATION_STATUS_NONE, |
d0ae46c1 | 77 | .bandwidth_limit = MAX_THROTTLE, |
17ad9b35 | 78 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, |
7e114f8c | 79 | .mbps = -1, |
43c60a81 LL |
80 | .parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = |
81 | DEFAULT_MIGRATE_COMPRESS_LEVEL, | |
82 | .parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = | |
83 | DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT, | |
84 | .parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] = | |
85 | DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT, | |
1626fee3 JH |
86 | .parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] = |
87 | DEFAULT_MIGRATE_X_CPU_THROTTLE_INITIAL, | |
88 | .parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] = | |
89 | DEFAULT_MIGRATE_X_CPU_THROTTLE_INCREMENT, | |
17549e84 JQ |
90 | }; |
91 | ||
92 | return ¤t_migration; | |
93 | } | |
94 | ||
bca7856a DDAG |
95 | /* For incoming */ |
96 | static MigrationIncomingState *mis_current; | |
97 | ||
98 | MigrationIncomingState *migration_incoming_get_current(void) | |
99 | { | |
100 | return mis_current; | |
101 | } | |
102 | ||
103 | MigrationIncomingState *migration_incoming_state_new(QEMUFile* f) | |
104 | { | |
97f3ad35 | 105 | mis_current = g_new0(MigrationIncomingState, 1); |
42e2aa56 | 106 | mis_current->from_src_file = f; |
1a8f46f8 | 107 | QLIST_INIT(&mis_current->loadvm_handlers); |
6decec93 | 108 | qemu_mutex_init(&mis_current->rp_mutex); |
7b89bf27 | 109 | qemu_event_init(&mis_current->main_thread_load_event, false); |
bca7856a DDAG |
110 | |
111 | return mis_current; | |
112 | } | |
113 | ||
114 | void migration_incoming_state_destroy(void) | |
115 | { | |
7b89bf27 | 116 | qemu_event_destroy(&mis_current->main_thread_load_event); |
1a8f46f8 | 117 | loadvm_free_handlers(mis_current); |
bca7856a DDAG |
118 | g_free(mis_current); |
119 | mis_current = NULL; | |
120 | } | |
121 | ||
df4b1024 JQ |
122 | |
123 | typedef struct { | |
13d16814 | 124 | bool optional; |
df4b1024 JQ |
125 | uint32_t size; |
126 | uint8_t runstate[100]; | |
172c4356 JQ |
127 | RunState state; |
128 | bool received; | |
df4b1024 JQ |
129 | } GlobalState; |
130 | ||
131 | static GlobalState global_state; | |
132 | ||
560d027b | 133 | int global_state_store(void) |
df4b1024 JQ |
134 | { |
135 | if (!runstate_store((char *)global_state.runstate, | |
136 | sizeof(global_state.runstate))) { | |
137 | error_report("runstate name too big: %s", global_state.runstate); | |
138 | trace_migrate_state_too_big(); | |
139 | return -EINVAL; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
c69adea4 AP |
144 | void global_state_store_running(void) |
145 | { | |
146 | const char *state = RunState_lookup[RUN_STATE_RUNNING]; | |
147 | strncpy((char *)global_state.runstate, | |
148 | state, sizeof(global_state.runstate)); | |
149 | } | |
150 | ||
172c4356 | 151 | static bool global_state_received(void) |
df4b1024 | 152 | { |
172c4356 JQ |
153 | return global_state.received; |
154 | } | |
155 | ||
156 | static RunState global_state_get_runstate(void) | |
157 | { | |
158 | return global_state.state; | |
df4b1024 JQ |
159 | } |
160 | ||
13d16814 JQ |
161 | void global_state_set_optional(void) |
162 | { | |
163 | global_state.optional = true; | |
164 | } | |
165 | ||
166 | static bool global_state_needed(void *opaque) | |
167 | { | |
168 | GlobalState *s = opaque; | |
169 | char *runstate = (char *)s->runstate; | |
170 | ||
171 | /* If it is not optional, it is mandatory */ | |
172 | ||
173 | if (s->optional == false) { | |
174 | return true; | |
175 | } | |
176 | ||
177 | /* If state is running or paused, it is not needed */ | |
178 | ||
179 | if (strcmp(runstate, "running") == 0 || | |
180 | strcmp(runstate, "paused") == 0) { | |
181 | return false; | |
182 | } | |
183 | ||
184 | /* for any other state it is needed */ | |
185 | return true; | |
186 | } | |
187 | ||
df4b1024 JQ |
188 | static int global_state_post_load(void *opaque, int version_id) |
189 | { | |
190 | GlobalState *s = opaque; | |
172c4356 JQ |
191 | Error *local_err = NULL; |
192 | int r; | |
df4b1024 JQ |
193 | char *runstate = (char *)s->runstate; |
194 | ||
172c4356 | 195 | s->received = true; |
df4b1024 JQ |
196 | trace_migrate_global_state_post_load(runstate); |
197 | ||
172c4356 | 198 | r = qapi_enum_parse(RunState_lookup, runstate, RUN_STATE_MAX, |
df4b1024 JQ |
199 | -1, &local_err); |
200 | ||
172c4356 JQ |
201 | if (r == -1) { |
202 | if (local_err) { | |
203 | error_report_err(local_err); | |
df4b1024 | 204 | } |
172c4356 | 205 | return -EINVAL; |
df4b1024 | 206 | } |
172c4356 | 207 | s->state = r; |
df4b1024 | 208 | |
172c4356 | 209 | return 0; |
df4b1024 JQ |
210 | } |
211 | ||
212 | static void global_state_pre_save(void *opaque) | |
213 | { | |
214 | GlobalState *s = opaque; | |
215 | ||
216 | trace_migrate_global_state_pre_save((char *)s->runstate); | |
217 | s->size = strlen((char *)s->runstate) + 1; | |
218 | } | |
219 | ||
220 | static const VMStateDescription vmstate_globalstate = { | |
221 | .name = "globalstate", | |
222 | .version_id = 1, | |
223 | .minimum_version_id = 1, | |
224 | .post_load = global_state_post_load, | |
225 | .pre_save = global_state_pre_save, | |
13d16814 | 226 | .needed = global_state_needed, |
df4b1024 JQ |
227 | .fields = (VMStateField[]) { |
228 | VMSTATE_UINT32(size, GlobalState), | |
229 | VMSTATE_BUFFER(runstate, GlobalState), | |
230 | VMSTATE_END_OF_LIST() | |
231 | }, | |
232 | }; | |
233 | ||
234 | void register_global_state(void) | |
235 | { | |
236 | /* We would use it independently that we receive it */ | |
237 | strcpy((char *)&global_state.runstate, ""); | |
172c4356 | 238 | global_state.received = false; |
df4b1024 JQ |
239 | vmstate_register(NULL, 0, &vmstate_globalstate, &global_state); |
240 | } | |
241 | ||
b05dc723 JQ |
242 | static void migrate_generate_event(int new_state) |
243 | { | |
244 | if (migrate_use_events()) { | |
245 | qapi_event_send_migration(new_state, &error_abort); | |
b05dc723 JQ |
246 | } |
247 | } | |
248 | ||
adde220a DDAG |
249 | /* |
250 | * Called on -incoming with a defer: uri. | |
251 | * The migration can be started later after any parameters have been | |
252 | * changed. | |
253 | */ | |
254 | static void deferred_incoming_migration(Error **errp) | |
255 | { | |
256 | if (deferred_incoming) { | |
257 | error_setg(errp, "Incoming migration already deferred"); | |
258 | } | |
259 | deferred_incoming = true; | |
260 | } | |
261 | ||
43eaae28 | 262 | void qemu_start_incoming_migration(const char *uri, Error **errp) |
5bb7910a | 263 | { |
34c9dd8e AL |
264 | const char *p; |
265 | ||
7cf1fe6d | 266 | qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort); |
adde220a DDAG |
267 | if (!strcmp(uri, "defer")) { |
268 | deferred_incoming_migration(errp); | |
269 | } else if (strstart(uri, "tcp:", &p)) { | |
43eaae28 | 270 | tcp_start_incoming_migration(p, errp); |
2da776db | 271 | #ifdef CONFIG_RDMA |
adde220a | 272 | } else if (strstart(uri, "rdma:", &p)) { |
2da776db MH |
273 | rdma_start_incoming_migration(p, errp); |
274 | #endif | |
065e2813 | 275 | #if !defined(WIN32) |
adde220a | 276 | } else if (strstart(uri, "exec:", &p)) { |
43eaae28 | 277 | exec_start_incoming_migration(p, errp); |
adde220a | 278 | } else if (strstart(uri, "unix:", &p)) { |
43eaae28 | 279 | unix_start_incoming_migration(p, errp); |
adde220a | 280 | } else if (strstart(uri, "fd:", &p)) { |
43eaae28 | 281 | fd_start_incoming_migration(p, errp); |
065e2813 | 282 | #endif |
adde220a | 283 | } else { |
312fd5f2 | 284 | error_setg(errp, "unknown migration protocol: %s", uri); |
8ca5e801 | 285 | } |
5bb7910a AL |
286 | } |
287 | ||
82a4da79 | 288 | static void process_incoming_migration_co(void *opaque) |
511c0231 | 289 | { |
82a4da79 | 290 | QEMUFile *f = opaque; |
5a8a30db | 291 | Error *local_err = NULL; |
1c12e1f5 PB |
292 | int ret; |
293 | ||
bca7856a | 294 | migration_incoming_state_new(f); |
093e3c42 | 295 | postcopy_state_set(POSTCOPY_INCOMING_NONE); |
7cf1fe6d | 296 | migrate_generate_event(MIGRATION_STATUS_ACTIVE); |
1c12e1f5 | 297 | ret = qemu_loadvm_state(f); |
bca7856a | 298 | |
1c12e1f5 | 299 | qemu_fclose(f); |
905f26f2 | 300 | free_xbzrle_decoded_buf(); |
bca7856a DDAG |
301 | migration_incoming_state_destroy(); |
302 | ||
1c12e1f5 | 303 | if (ret < 0) { |
7cf1fe6d | 304 | migrate_generate_event(MIGRATION_STATUS_FAILED); |
db80face | 305 | error_report("load of migration failed: %s", strerror(-ret)); |
3fcb38c2 | 306 | migrate_decompress_threads_join(); |
4aead692 | 307 | exit(EXIT_FAILURE); |
511c0231 | 308 | } |
511c0231 | 309 | |
0f15423c | 310 | /* Make sure all file formats flush their mutable metadata */ |
5a8a30db KW |
311 | bdrv_invalidate_cache_all(&local_err); |
312 | if (local_err) { | |
ed1f3e00 | 313 | migrate_generate_event(MIGRATION_STATUS_FAILED); |
97baf9d9 | 314 | error_report_err(local_err); |
3fcb38c2 | 315 | migrate_decompress_threads_join(); |
5a8a30db KW |
316 | exit(EXIT_FAILURE); |
317 | } | |
0f15423c | 318 | |
92e37622 AS |
319 | /* |
320 | * This must happen after all error conditions are dealt with and | |
321 | * we're sure the VM is going to be running on this host. | |
322 | */ | |
323 | qemu_announce_self(); | |
324 | ||
172c4356 JQ |
325 | /* If global state section was not received or we are in running |
326 | state, we need to obey autostart. Any other state is set with | |
327 | runstate_set. */ | |
df4b1024 | 328 | |
172c4356 JQ |
329 | if (!global_state_received() || |
330 | global_state_get_runstate() == RUN_STATE_RUNNING) { | |
df4b1024 JQ |
331 | if (autostart) { |
332 | vm_start(); | |
333 | } else { | |
334 | runstate_set(RUN_STATE_PAUSED); | |
335 | } | |
172c4356 JQ |
336 | } else { |
337 | runstate_set(global_state_get_runstate()); | |
f5bbfba1 | 338 | } |
3fcb38c2 | 339 | migrate_decompress_threads_join(); |
ed1f3e00 DDAG |
340 | /* |
341 | * This must happen after any state changes since as soon as an external | |
342 | * observer sees this event they might start to prod at the VM assuming | |
343 | * it's ready to use. | |
344 | */ | |
345 | migrate_generate_event(MIGRATION_STATUS_COMPLETED); | |
511c0231 JQ |
346 | } |
347 | ||
82a4da79 PB |
348 | void process_incoming_migration(QEMUFile *f) |
349 | { | |
350 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); | |
351 | int fd = qemu_get_fd(f); | |
352 | ||
353 | assert(fd != -1); | |
3fcb38c2 | 354 | migrate_decompress_threads_create(); |
f9e8cacc | 355 | qemu_set_nonblock(fd); |
82a4da79 PB |
356 | qemu_coroutine_enter(co, f); |
357 | } | |
358 | ||
6decec93 DDAG |
359 | /* |
360 | * Send a message on the return channel back to the source | |
361 | * of the migration. | |
362 | */ | |
363 | void migrate_send_rp_message(MigrationIncomingState *mis, | |
364 | enum mig_rp_message_type message_type, | |
365 | uint16_t len, void *data) | |
366 | { | |
367 | trace_migrate_send_rp_message((int)message_type, len); | |
368 | qemu_mutex_lock(&mis->rp_mutex); | |
369 | qemu_put_be16(mis->to_src_file, (unsigned int)message_type); | |
370 | qemu_put_be16(mis->to_src_file, len); | |
371 | qemu_put_buffer(mis->to_src_file, data, len); | |
372 | qemu_fflush(mis->to_src_file); | |
373 | qemu_mutex_unlock(&mis->rp_mutex); | |
374 | } | |
375 | ||
376 | /* | |
377 | * Send a 'SHUT' message on the return channel with the given value | |
378 | * to indicate that we've finished with the RP. Non-0 value indicates | |
379 | * error. | |
380 | */ | |
381 | void migrate_send_rp_shut(MigrationIncomingState *mis, | |
382 | uint32_t value) | |
383 | { | |
384 | uint32_t buf; | |
385 | ||
386 | buf = cpu_to_be32(value); | |
387 | migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); | |
388 | } | |
389 | ||
390 | /* | |
391 | * Send a 'PONG' message on the return channel with the given value | |
392 | * (normally in response to a 'PING') | |
393 | */ | |
394 | void migrate_send_rp_pong(MigrationIncomingState *mis, | |
395 | uint32_t value) | |
396 | { | |
397 | uint32_t buf; | |
398 | ||
399 | buf = cpu_to_be32(value); | |
400 | migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); | |
401 | } | |
402 | ||
a0a3fd60 GC |
403 | /* amount of nanoseconds we are willing to wait for migration to be down. |
404 | * the choice of nanoseconds is because it is the maximum resolution that | |
405 | * get_clock() can achieve. It is an internal measure. All user-visible | |
406 | * units must be in seconds */ | |
f7cd55a0 | 407 | static uint64_t max_downtime = 300000000; |
a0a3fd60 GC |
408 | |
409 | uint64_t migrate_max_downtime(void) | |
410 | { | |
411 | return max_downtime; | |
412 | } | |
413 | ||
bbf6da32 OW |
414 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) |
415 | { | |
416 | MigrationCapabilityStatusList *head = NULL; | |
417 | MigrationCapabilityStatusList *caps; | |
418 | MigrationState *s = migrate_get_current(); | |
419 | int i; | |
420 | ||
387eedeb | 421 | caps = NULL; /* silence compiler warning */ |
bbf6da32 OW |
422 | for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) { |
423 | if (head == NULL) { | |
424 | head = g_malloc0(sizeof(*caps)); | |
425 | caps = head; | |
426 | } else { | |
427 | caps->next = g_malloc0(sizeof(*caps)); | |
428 | caps = caps->next; | |
429 | } | |
430 | caps->value = | |
431 | g_malloc(sizeof(*caps->value)); | |
432 | caps->value->capability = i; | |
433 | caps->value->state = s->enabled_capabilities[i]; | |
434 | } | |
435 | ||
436 | return head; | |
437 | } | |
438 | ||
85de8323 LL |
439 | MigrationParameters *qmp_query_migrate_parameters(Error **errp) |
440 | { | |
441 | MigrationParameters *params; | |
442 | MigrationState *s = migrate_get_current(); | |
443 | ||
444 | params = g_malloc0(sizeof(*params)); | |
445 | params->compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL]; | |
446 | params->compress_threads = | |
447 | s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS]; | |
448 | params->decompress_threads = | |
449 | s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS]; | |
1626fee3 JH |
450 | params->x_cpu_throttle_initial = |
451 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL]; | |
452 | params->x_cpu_throttle_increment = | |
453 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT]; | |
85de8323 LL |
454 | |
455 | return params; | |
456 | } | |
457 | ||
f6844b99 DDAG |
458 | /* |
459 | * Return true if we're already in the middle of a migration | |
460 | * (i.e. any of the active or setup states) | |
461 | */ | |
462 | static bool migration_is_setup_or_active(int state) | |
463 | { | |
464 | switch (state) { | |
465 | case MIGRATION_STATUS_ACTIVE: | |
9ec055ae | 466 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
f6844b99 DDAG |
467 | case MIGRATION_STATUS_SETUP: |
468 | return true; | |
469 | ||
470 | default: | |
471 | return false; | |
472 | ||
473 | } | |
474 | } | |
475 | ||
f36d55af OW |
476 | static void get_xbzrle_cache_stats(MigrationInfo *info) |
477 | { | |
478 | if (migrate_use_xbzrle()) { | |
479 | info->has_xbzrle_cache = true; | |
480 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
481 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
482 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
483 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
484 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
8bc39233 | 485 | info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate(); |
f36d55af OW |
486 | info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); |
487 | } | |
488 | } | |
489 | ||
791e7c82 | 490 | MigrationInfo *qmp_query_migrate(Error **errp) |
5bb7910a | 491 | { |
791e7c82 | 492 | MigrationInfo *info = g_malloc0(sizeof(*info)); |
17549e84 JQ |
493 | MigrationState *s = migrate_get_current(); |
494 | ||
495 | switch (s->state) { | |
31194731 | 496 | case MIGRATION_STATUS_NONE: |
17549e84 JQ |
497 | /* no migration has happened ever */ |
498 | break; | |
31194731 | 499 | case MIGRATION_STATUS_SETUP: |
29ae8a41 | 500 | info->has_status = true; |
ed4fbd10 | 501 | info->has_total_time = false; |
29ae8a41 | 502 | break; |
31194731 HZ |
503 | case MIGRATION_STATUS_ACTIVE: |
504 | case MIGRATION_STATUS_CANCELLING: | |
791e7c82 | 505 | info->has_status = true; |
7aa939af | 506 | info->has_total_time = true; |
bc72ad67 | 507 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) |
7aa939af | 508 | - s->total_time; |
2c52ddf1 JQ |
509 | info->has_expected_downtime = true; |
510 | info->expected_downtime = s->expected_downtime; | |
ed4fbd10 MH |
511 | info->has_setup_time = true; |
512 | info->setup_time = s->setup_time; | |
17549e84 | 513 | |
791e7c82 LC |
514 | info->has_ram = true; |
515 | info->ram = g_malloc0(sizeof(*info->ram)); | |
516 | info->ram->transferred = ram_bytes_transferred(); | |
517 | info->ram->remaining = ram_bytes_remaining(); | |
518 | info->ram->total = ram_bytes_total(); | |
004d4c10 | 519 | info->ram->duplicate = dup_mig_pages_transferred(); |
f1c72795 | 520 | info->ram->skipped = skipped_mig_pages_transferred(); |
004d4c10 OW |
521 | info->ram->normal = norm_mig_pages_transferred(); |
522 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
8d017193 | 523 | info->ram->dirty_pages_rate = s->dirty_pages_rate; |
7e114f8c | 524 | info->ram->mbps = s->mbps; |
58570ed8 | 525 | info->ram->dirty_sync_count = s->dirty_sync_count; |
8d017193 | 526 | |
17549e84 | 527 | if (blk_mig_active()) { |
791e7c82 LC |
528 | info->has_disk = true; |
529 | info->disk = g_malloc0(sizeof(*info->disk)); | |
530 | info->disk->transferred = blk_mig_bytes_transferred(); | |
531 | info->disk->remaining = blk_mig_bytes_remaining(); | |
532 | info->disk->total = blk_mig_bytes_total(); | |
ff8d81d8 | 533 | } |
f36d55af | 534 | |
4782893e JH |
535 | if (cpu_throttle_active()) { |
536 | info->has_x_cpu_throttle_percentage = true; | |
537 | info->x_cpu_throttle_percentage = cpu_throttle_get_percentage(); | |
538 | } | |
539 | ||
9ec055ae DDAG |
540 | get_xbzrle_cache_stats(info); |
541 | break; | |
542 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
543 | /* Mostly the same as active; TODO add some postcopy stats */ | |
544 | info->has_status = true; | |
545 | info->has_total_time = true; | |
546 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
547 | - s->total_time; | |
548 | info->has_expected_downtime = true; | |
549 | info->expected_downtime = s->expected_downtime; | |
550 | info->has_setup_time = true; | |
551 | info->setup_time = s->setup_time; | |
552 | ||
553 | info->has_ram = true; | |
554 | info->ram = g_malloc0(sizeof(*info->ram)); | |
555 | info->ram->transferred = ram_bytes_transferred(); | |
556 | info->ram->remaining = ram_bytes_remaining(); | |
557 | info->ram->total = ram_bytes_total(); | |
558 | info->ram->duplicate = dup_mig_pages_transferred(); | |
559 | info->ram->skipped = skipped_mig_pages_transferred(); | |
560 | info->ram->normal = norm_mig_pages_transferred(); | |
561 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
562 | info->ram->dirty_pages_rate = s->dirty_pages_rate; | |
563 | info->ram->mbps = s->mbps; | |
564 | ||
565 | if (blk_mig_active()) { | |
566 | info->has_disk = true; | |
567 | info->disk = g_malloc0(sizeof(*info->disk)); | |
568 | info->disk->transferred = blk_mig_bytes_transferred(); | |
569 | info->disk->remaining = blk_mig_bytes_remaining(); | |
570 | info->disk->total = blk_mig_bytes_total(); | |
571 | } | |
572 | ||
f36d55af | 573 | get_xbzrle_cache_stats(info); |
17549e84 | 574 | break; |
31194731 | 575 | case MIGRATION_STATUS_COMPLETED: |
f36d55af OW |
576 | get_xbzrle_cache_stats(info); |
577 | ||
791e7c82 | 578 | info->has_status = true; |
00c14997 | 579 | info->has_total_time = true; |
7aa939af | 580 | info->total_time = s->total_time; |
9c5a9fcf JQ |
581 | info->has_downtime = true; |
582 | info->downtime = s->downtime; | |
ed4fbd10 MH |
583 | info->has_setup_time = true; |
584 | info->setup_time = s->setup_time; | |
d5f8a570 JQ |
585 | |
586 | info->has_ram = true; | |
587 | info->ram = g_malloc0(sizeof(*info->ram)); | |
588 | info->ram->transferred = ram_bytes_transferred(); | |
589 | info->ram->remaining = 0; | |
590 | info->ram->total = ram_bytes_total(); | |
004d4c10 | 591 | info->ram->duplicate = dup_mig_pages_transferred(); |
f1c72795 | 592 | info->ram->skipped = skipped_mig_pages_transferred(); |
004d4c10 OW |
593 | info->ram->normal = norm_mig_pages_transferred(); |
594 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
7e114f8c | 595 | info->ram->mbps = s->mbps; |
58570ed8 | 596 | info->ram->dirty_sync_count = s->dirty_sync_count; |
17549e84 | 597 | break; |
31194731 | 598 | case MIGRATION_STATUS_FAILED: |
791e7c82 | 599 | info->has_status = true; |
17549e84 | 600 | break; |
31194731 | 601 | case MIGRATION_STATUS_CANCELLED: |
791e7c82 | 602 | info->has_status = true; |
17549e84 | 603 | break; |
5bb7910a | 604 | } |
cde63fbe | 605 | info->status = s->state; |
791e7c82 LC |
606 | |
607 | return info; | |
5bb7910a AL |
608 | } |
609 | ||
00458433 OW |
610 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, |
611 | Error **errp) | |
612 | { | |
613 | MigrationState *s = migrate_get_current(); | |
614 | MigrationCapabilityStatusList *cap; | |
615 | ||
f6844b99 | 616 | if (migration_is_setup_or_active(s->state)) { |
c6bd8c70 | 617 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
00458433 OW |
618 | return; |
619 | } | |
620 | ||
621 | for (cap = params; cap; cap = cap->next) { | |
622 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
623 | } | |
53dd370c DDAG |
624 | |
625 | if (migrate_postcopy_ram()) { | |
626 | if (migrate_use_compression()) { | |
627 | /* The decompression threads asynchronously write into RAM | |
628 | * rather than use the atomic copies needed to avoid | |
629 | * userfaulting. It should be possible to fix the decompression | |
630 | * threads for compatibility in future. | |
631 | */ | |
632 | error_report("Postcopy is not currently compatible with " | |
633 | "compression"); | |
634 | s->enabled_capabilities[MIGRATION_CAPABILITY_X_POSTCOPY_RAM] = | |
635 | false; | |
636 | } | |
637 | } | |
00458433 OW |
638 | } |
639 | ||
85de8323 LL |
640 | void qmp_migrate_set_parameters(bool has_compress_level, |
641 | int64_t compress_level, | |
642 | bool has_compress_threads, | |
643 | int64_t compress_threads, | |
644 | bool has_decompress_threads, | |
1626fee3 JH |
645 | int64_t decompress_threads, |
646 | bool has_x_cpu_throttle_initial, | |
647 | int64_t x_cpu_throttle_initial, | |
648 | bool has_x_cpu_throttle_increment, | |
649 | int64_t x_cpu_throttle_increment, Error **errp) | |
85de8323 LL |
650 | { |
651 | MigrationState *s = migrate_get_current(); | |
652 | ||
653 | if (has_compress_level && (compress_level < 0 || compress_level > 9)) { | |
c6bd8c70 MA |
654 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level", |
655 | "is invalid, it should be in the range of 0 to 9"); | |
85de8323 LL |
656 | return; |
657 | } | |
658 | if (has_compress_threads && | |
659 | (compress_threads < 1 || compress_threads > 255)) { | |
c6bd8c70 MA |
660 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
661 | "compress_threads", | |
662 | "is invalid, it should be in the range of 1 to 255"); | |
85de8323 LL |
663 | return; |
664 | } | |
665 | if (has_decompress_threads && | |
666 | (decompress_threads < 1 || decompress_threads > 255)) { | |
c6bd8c70 MA |
667 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
668 | "decompress_threads", | |
669 | "is invalid, it should be in the range of 1 to 255"); | |
85de8323 LL |
670 | return; |
671 | } | |
1626fee3 JH |
672 | if (has_x_cpu_throttle_initial && |
673 | (x_cpu_throttle_initial < 1 || x_cpu_throttle_initial > 99)) { | |
674 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
675 | "x_cpu_throttle_initial", | |
676 | "an integer in the range of 1 to 99"); | |
677 | } | |
678 | if (has_x_cpu_throttle_increment && | |
679 | (x_cpu_throttle_increment < 1 || x_cpu_throttle_increment > 99)) { | |
680 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
681 | "x_cpu_throttle_increment", | |
682 | "an integer in the range of 1 to 99"); | |
683 | } | |
85de8323 LL |
684 | |
685 | if (has_compress_level) { | |
686 | s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level; | |
687 | } | |
688 | if (has_compress_threads) { | |
689 | s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = compress_threads; | |
690 | } | |
691 | if (has_decompress_threads) { | |
692 | s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] = | |
693 | decompress_threads; | |
694 | } | |
1626fee3 JH |
695 | if (has_x_cpu_throttle_initial) { |
696 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] = | |
697 | x_cpu_throttle_initial; | |
698 | } | |
699 | ||
700 | if (has_x_cpu_throttle_increment) { | |
701 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] = | |
702 | x_cpu_throttle_increment; | |
703 | } | |
85de8323 LL |
704 | } |
705 | ||
4886a1bc DDAG |
706 | void qmp_migrate_start_postcopy(Error **errp) |
707 | { | |
708 | MigrationState *s = migrate_get_current(); | |
709 | ||
710 | if (!migrate_postcopy_ram()) { | |
711 | error_setg(errp, "Enable postcopy with migration_set_capability before" | |
712 | " the start of migration"); | |
713 | return; | |
714 | } | |
715 | ||
716 | if (s->state == MIGRATION_STATUS_NONE) { | |
717 | error_setg(errp, "Postcopy must be started after migration has been" | |
718 | " started"); | |
719 | return; | |
720 | } | |
721 | /* | |
722 | * we don't error if migration has finished since that would be racy | |
723 | * with issuing this command. | |
724 | */ | |
725 | atomic_set(&s->start_postcopy, true); | |
726 | } | |
727 | ||
065e2813 AL |
728 | /* shared migration helpers */ |
729 | ||
51cf4c1a Z |
730 | static void migrate_set_state(MigrationState *s, int old_state, int new_state) |
731 | { | |
a5c17b5f | 732 | if (atomic_cmpxchg(&s->state, old_state, new_state) == old_state) { |
4ba4bc5e | 733 | trace_migrate_set_state(new_state); |
b05dc723 | 734 | migrate_generate_event(new_state); |
51cf4c1a Z |
735 | } |
736 | } | |
737 | ||
bb1fadc4 | 738 | static void migrate_fd_cleanup(void *opaque) |
065e2813 | 739 | { |
bb1fadc4 PB |
740 | MigrationState *s = opaque; |
741 | ||
742 | qemu_bh_delete(s->cleanup_bh); | |
743 | s->cleanup_bh = NULL; | |
744 | ||
065e2813 | 745 | if (s->file) { |
9013dca5 | 746 | trace_migrate_fd_cleanup(); |
404a7c05 PB |
747 | qemu_mutex_unlock_iothread(); |
748 | qemu_thread_join(&s->thread); | |
749 | qemu_mutex_lock_iothread(); | |
750 | ||
8706d2d5 | 751 | migrate_compress_threads_join(); |
6f190a06 PB |
752 | qemu_fclose(s->file); |
753 | s->file = NULL; | |
065e2813 AL |
754 | } |
755 | ||
9ec055ae DDAG |
756 | assert((s->state != MIGRATION_STATUS_ACTIVE) && |
757 | (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE)); | |
7a2c1721 | 758 | |
94f5a437 LL |
759 | if (s->state == MIGRATION_STATUS_CANCELLING) { |
760 | migrate_set_state(s, MIGRATION_STATUS_CANCELLING, | |
761 | MIGRATION_STATUS_CANCELLED); | |
7a2c1721 | 762 | } |
a3fa1d78 PB |
763 | |
764 | notifier_list_notify(&migration_state_notifiers, s); | |
065e2813 AL |
765 | } |
766 | ||
8b6b99b3 | 767 | void migrate_fd_error(MigrationState *s) |
065e2813 | 768 | { |
9013dca5 | 769 | trace_migrate_fd_error(); |
bb1fadc4 | 770 | assert(s->file == NULL); |
7844337d | 771 | migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_FAILED); |
bb1fadc4 | 772 | notifier_list_notify(&migration_state_notifiers, s); |
458cf28e JQ |
773 | } |
774 | ||
0edda1c4 | 775 | static void migrate_fd_cancel(MigrationState *s) |
065e2813 | 776 | { |
6f2b811a | 777 | int old_state ; |
a26ba26e | 778 | QEMUFile *f = migrate_get_current()->file; |
9013dca5 | 779 | trace_migrate_fd_cancel(); |
065e2813 | 780 | |
70b20477 DDAG |
781 | if (s->rp_state.from_dst_file) { |
782 | /* shutdown the rp socket, so causing the rp thread to shutdown */ | |
783 | qemu_file_shutdown(s->rp_state.from_dst_file); | |
784 | } | |
785 | ||
6f2b811a Z |
786 | do { |
787 | old_state = s->state; | |
f6844b99 | 788 | if (!migration_is_setup_or_active(old_state)) { |
6f2b811a Z |
789 | break; |
790 | } | |
31194731 HZ |
791 | migrate_set_state(s, old_state, MIGRATION_STATUS_CANCELLING); |
792 | } while (s->state != MIGRATION_STATUS_CANCELLING); | |
a26ba26e DDAG |
793 | |
794 | /* | |
795 | * If we're unlucky the migration code might be stuck somewhere in a | |
796 | * send/write while the network has failed and is waiting to timeout; | |
797 | * if we've got shutdown(2) available then we can force it to quit. | |
798 | * The outgoing qemu file gets closed in migrate_fd_cleanup that is | |
799 | * called in a bh, so there is no race against this cancel. | |
800 | */ | |
31194731 | 801 | if (s->state == MIGRATION_STATUS_CANCELLING && f) { |
a26ba26e DDAG |
802 | qemu_file_shutdown(f); |
803 | } | |
065e2813 AL |
804 | } |
805 | ||
99a0db9b GH |
806 | void add_migration_state_change_notifier(Notifier *notify) |
807 | { | |
808 | notifier_list_add(&migration_state_notifiers, notify); | |
809 | } | |
810 | ||
811 | void remove_migration_state_change_notifier(Notifier *notify) | |
812 | { | |
31552529 | 813 | notifier_remove(notify); |
99a0db9b GH |
814 | } |
815 | ||
02edd2e7 | 816 | bool migration_in_setup(MigrationState *s) |
afe2df69 | 817 | { |
31194731 | 818 | return s->state == MIGRATION_STATUS_SETUP; |
afe2df69 GH |
819 | } |
820 | ||
7073693b | 821 | bool migration_has_finished(MigrationState *s) |
99a0db9b | 822 | { |
31194731 | 823 | return s->state == MIGRATION_STATUS_COMPLETED; |
99a0db9b | 824 | } |
0edda1c4 | 825 | |
afe2df69 GH |
826 | bool migration_has_failed(MigrationState *s) |
827 | { | |
31194731 HZ |
828 | return (s->state == MIGRATION_STATUS_CANCELLED || |
829 | s->state == MIGRATION_STATUS_FAILED); | |
afe2df69 GH |
830 | } |
831 | ||
9ec055ae DDAG |
832 | bool migration_in_postcopy(MigrationState *s) |
833 | { | |
834 | return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
835 | } | |
836 | ||
aefeb18b | 837 | MigrationState *migrate_init(const MigrationParams *params) |
0edda1c4 | 838 | { |
17549e84 | 839 | MigrationState *s = migrate_get_current(); |
d0ae46c1 | 840 | int64_t bandwidth_limit = s->bandwidth_limit; |
bbf6da32 | 841 | bool enabled_capabilities[MIGRATION_CAPABILITY_MAX]; |
17ad9b35 | 842 | int64_t xbzrle_cache_size = s->xbzrle_cache_size; |
43c60a81 LL |
843 | int compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL]; |
844 | int compress_thread_count = | |
845 | s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS]; | |
846 | int decompress_thread_count = | |
847 | s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS]; | |
1626fee3 JH |
848 | int x_cpu_throttle_initial = |
849 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL]; | |
850 | int x_cpu_throttle_increment = | |
851 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT]; | |
bbf6da32 OW |
852 | |
853 | memcpy(enabled_capabilities, s->enabled_capabilities, | |
854 | sizeof(enabled_capabilities)); | |
0edda1c4 | 855 | |
17549e84 | 856 | memset(s, 0, sizeof(*s)); |
6607ae23 | 857 | s->params = *params; |
bbf6da32 OW |
858 | memcpy(s->enabled_capabilities, enabled_capabilities, |
859 | sizeof(enabled_capabilities)); | |
17ad9b35 | 860 | s->xbzrle_cache_size = xbzrle_cache_size; |
1299c631 | 861 | |
43c60a81 LL |
862 | s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level; |
863 | s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = | |
864 | compress_thread_count; | |
865 | s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] = | |
866 | decompress_thread_count; | |
1626fee3 JH |
867 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] = |
868 | x_cpu_throttle_initial; | |
869 | s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] = | |
870 | x_cpu_throttle_increment; | |
0edda1c4 | 871 | s->bandwidth_limit = bandwidth_limit; |
7844337d | 872 | migrate_set_state(s, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); |
0edda1c4 | 873 | |
bc72ad67 | 874 | s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
0edda1c4 JQ |
875 | return s; |
876 | } | |
cab30143 | 877 | |
fa2756b7 AL |
878 | static GSList *migration_blockers; |
879 | ||
880 | void migrate_add_blocker(Error *reason) | |
881 | { | |
882 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
883 | } | |
884 | ||
885 | void migrate_del_blocker(Error *reason) | |
886 | { | |
887 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
888 | } | |
889 | ||
bf1ae1f4 DDAG |
890 | void qmp_migrate_incoming(const char *uri, Error **errp) |
891 | { | |
892 | Error *local_err = NULL; | |
4debb5f5 | 893 | static bool once = true; |
bf1ae1f4 DDAG |
894 | |
895 | if (!deferred_incoming) { | |
4debb5f5 | 896 | error_setg(errp, "For use with '-incoming defer'"); |
bf1ae1f4 DDAG |
897 | return; |
898 | } | |
4debb5f5 DDAG |
899 | if (!once) { |
900 | error_setg(errp, "The incoming migration has already been started"); | |
901 | } | |
bf1ae1f4 DDAG |
902 | |
903 | qemu_start_incoming_migration(uri, &local_err); | |
904 | ||
905 | if (local_err) { | |
906 | error_propagate(errp, local_err); | |
907 | return; | |
908 | } | |
909 | ||
4debb5f5 | 910 | once = false; |
bf1ae1f4 DDAG |
911 | } |
912 | ||
e1c37d0e LC |
913 | void qmp_migrate(const char *uri, bool has_blk, bool blk, |
914 | bool has_inc, bool inc, bool has_detach, bool detach, | |
915 | Error **errp) | |
cab30143 | 916 | { |
be7059cd | 917 | Error *local_err = NULL; |
17549e84 | 918 | MigrationState *s = migrate_get_current(); |
6607ae23 | 919 | MigrationParams params; |
cab30143 | 920 | const char *p; |
cab30143 | 921 | |
8c0426ae PP |
922 | params.blk = has_blk && blk; |
923 | params.shared = has_inc && inc; | |
6607ae23 | 924 | |
f6844b99 | 925 | if (migration_is_setup_or_active(s->state) || |
31194731 | 926 | s->state == MIGRATION_STATUS_CANCELLING) { |
c6bd8c70 | 927 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
e1c37d0e | 928 | return; |
cab30143 | 929 | } |
ca99993a DDAG |
930 | if (runstate_check(RUN_STATE_INMIGRATE)) { |
931 | error_setg(errp, "Guest is waiting for an incoming migration"); | |
932 | return; | |
933 | } | |
934 | ||
e1c37d0e LC |
935 | if (qemu_savevm_state_blocked(errp)) { |
936 | return; | |
cab30143 JQ |
937 | } |
938 | ||
fa2756b7 | 939 | if (migration_blockers) { |
e1c37d0e LC |
940 | *errp = error_copy(migration_blockers->data); |
941 | return; | |
fa2756b7 AL |
942 | } |
943 | ||
656a2334 JQ |
944 | /* We are starting a new migration, so we want to start in a clean |
945 | state. This change is only needed if previous migration | |
946 | failed/was cancelled. We don't use migrate_set_state() because | |
947 | we are setting the initial state, not changing it. */ | |
948 | s->state = MIGRATION_STATUS_NONE; | |
949 | ||
6607ae23 | 950 | s = migrate_init(¶ms); |
cab30143 JQ |
951 | |
952 | if (strstart(uri, "tcp:", &p)) { | |
f37afb5a | 953 | tcp_start_outgoing_migration(s, p, &local_err); |
2da776db | 954 | #ifdef CONFIG_RDMA |
41310c68 | 955 | } else if (strstart(uri, "rdma:", &p)) { |
2da776db MH |
956 | rdma_start_outgoing_migration(s, p, &local_err); |
957 | #endif | |
cab30143 JQ |
958 | #if !defined(WIN32) |
959 | } else if (strstart(uri, "exec:", &p)) { | |
f37afb5a | 960 | exec_start_outgoing_migration(s, p, &local_err); |
cab30143 | 961 | } else if (strstart(uri, "unix:", &p)) { |
f37afb5a | 962 | unix_start_outgoing_migration(s, p, &local_err); |
cab30143 | 963 | } else if (strstart(uri, "fd:", &p)) { |
f37afb5a | 964 | fd_start_outgoing_migration(s, p, &local_err); |
cab30143 | 965 | #endif |
99a0db9b | 966 | } else { |
c6bd8c70 MA |
967 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri", |
968 | "a valid migration protocol"); | |
7844337d | 969 | migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_FAILED); |
e1c37d0e | 970 | return; |
cab30143 JQ |
971 | } |
972 | ||
f37afb5a | 973 | if (local_err) { |
342ab8d1 | 974 | migrate_fd_error(s); |
f37afb5a | 975 | error_propagate(errp, local_err); |
e1c37d0e | 976 | return; |
1299c631 | 977 | } |
cab30143 JQ |
978 | } |
979 | ||
6cdedb07 | 980 | void qmp_migrate_cancel(Error **errp) |
cab30143 | 981 | { |
17549e84 | 982 | migrate_fd_cancel(migrate_get_current()); |
cab30143 JQ |
983 | } |
984 | ||
9e1ba4cc OW |
985 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) |
986 | { | |
987 | MigrationState *s = migrate_get_current(); | |
c91e681a | 988 | int64_t new_size; |
9e1ba4cc OW |
989 | |
990 | /* Check for truncation */ | |
991 | if (value != (size_t)value) { | |
c6bd8c70 MA |
992 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", |
993 | "exceeding address space"); | |
9e1ba4cc OW |
994 | return; |
995 | } | |
996 | ||
a5615b14 OW |
997 | /* Cache should not be larger than guest ram size */ |
998 | if (value > ram_bytes_total()) { | |
c6bd8c70 MA |
999 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", |
1000 | "exceeds guest ram size "); | |
a5615b14 OW |
1001 | return; |
1002 | } | |
1003 | ||
c91e681a OW |
1004 | new_size = xbzrle_cache_resize(value); |
1005 | if (new_size < 0) { | |
c6bd8c70 MA |
1006 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", |
1007 | "is smaller than page size"); | |
c91e681a OW |
1008 | return; |
1009 | } | |
1010 | ||
1011 | s->xbzrle_cache_size = new_size; | |
9e1ba4cc OW |
1012 | } |
1013 | ||
1014 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
1015 | { | |
1016 | return migrate_xbzrle_cache_size(); | |
1017 | } | |
1018 | ||
3dc85383 | 1019 | void qmp_migrate_set_speed(int64_t value, Error **errp) |
cab30143 | 1020 | { |
cab30143 JQ |
1021 | MigrationState *s; |
1022 | ||
3dc85383 LC |
1023 | if (value < 0) { |
1024 | value = 0; | |
99a0db9b | 1025 | } |
442773ce PB |
1026 | if (value > SIZE_MAX) { |
1027 | value = SIZE_MAX; | |
1028 | } | |
cab30143 | 1029 | |
17549e84 | 1030 | s = migrate_get_current(); |
3dc85383 | 1031 | s->bandwidth_limit = value; |
442773ce PB |
1032 | if (s->file) { |
1033 | qemu_file_set_rate_limit(s->file, s->bandwidth_limit / XFER_LIMIT_RATIO); | |
1034 | } | |
cab30143 JQ |
1035 | } |
1036 | ||
4f0a993b | 1037 | void qmp_migrate_set_downtime(double value, Error **errp) |
cab30143 | 1038 | { |
4f0a993b LC |
1039 | value *= 1e9; |
1040 | value = MAX(0, MIN(UINT64_MAX, value)); | |
1041 | max_downtime = (uint64_t)value; | |
99a0db9b | 1042 | } |
17ad9b35 | 1043 | |
53dd370c DDAG |
1044 | bool migrate_postcopy_ram(void) |
1045 | { | |
1046 | MigrationState *s; | |
1047 | ||
1048 | s = migrate_get_current(); | |
1049 | ||
1050 | return s->enabled_capabilities[MIGRATION_CAPABILITY_X_POSTCOPY_RAM]; | |
1051 | } | |
1052 | ||
bde1e2ec CV |
1053 | bool migrate_auto_converge(void) |
1054 | { | |
1055 | MigrationState *s; | |
1056 | ||
1057 | s = migrate_get_current(); | |
1058 | ||
1059 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; | |
1060 | } | |
1061 | ||
323004a3 PL |
1062 | bool migrate_zero_blocks(void) |
1063 | { | |
1064 | MigrationState *s; | |
1065 | ||
1066 | s = migrate_get_current(); | |
1067 | ||
1068 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; | |
1069 | } | |
1070 | ||
8706d2d5 LL |
1071 | bool migrate_use_compression(void) |
1072 | { | |
dde4e694 LL |
1073 | MigrationState *s; |
1074 | ||
1075 | s = migrate_get_current(); | |
1076 | ||
1077 | return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS]; | |
8706d2d5 LL |
1078 | } |
1079 | ||
1080 | int migrate_compress_level(void) | |
1081 | { | |
1082 | MigrationState *s; | |
1083 | ||
1084 | s = migrate_get_current(); | |
1085 | ||
43c60a81 | 1086 | return s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL]; |
8706d2d5 LL |
1087 | } |
1088 | ||
1089 | int migrate_compress_threads(void) | |
1090 | { | |
1091 | MigrationState *s; | |
1092 | ||
1093 | s = migrate_get_current(); | |
1094 | ||
43c60a81 | 1095 | return s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS]; |
8706d2d5 LL |
1096 | } |
1097 | ||
3fcb38c2 LL |
1098 | int migrate_decompress_threads(void) |
1099 | { | |
1100 | MigrationState *s; | |
1101 | ||
1102 | s = migrate_get_current(); | |
1103 | ||
43c60a81 | 1104 | return s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS]; |
3fcb38c2 LL |
1105 | } |
1106 | ||
b05dc723 JQ |
1107 | bool migrate_use_events(void) |
1108 | { | |
1109 | MigrationState *s; | |
1110 | ||
1111 | s = migrate_get_current(); | |
1112 | ||
1113 | return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS]; | |
1114 | } | |
1115 | ||
17ad9b35 OW |
1116 | int migrate_use_xbzrle(void) |
1117 | { | |
1118 | MigrationState *s; | |
1119 | ||
1120 | s = migrate_get_current(); | |
1121 | ||
1122 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
1123 | } | |
1124 | ||
1125 | int64_t migrate_xbzrle_cache_size(void) | |
1126 | { | |
1127 | MigrationState *s; | |
1128 | ||
1129 | s = migrate_get_current(); | |
1130 | ||
1131 | return s->xbzrle_cache_size; | |
1132 | } | |
0d82d0e8 | 1133 | |
70b20477 DDAG |
1134 | /* migration thread support */ |
1135 | /* | |
1136 | * Something bad happened to the RP stream, mark an error | |
1137 | * The caller shall print or trace something to indicate why | |
1138 | */ | |
1139 | static void mark_source_rp_bad(MigrationState *s) | |
1140 | { | |
1141 | s->rp_state.error = true; | |
1142 | } | |
1143 | ||
1144 | static struct rp_cmd_args { | |
1145 | ssize_t len; /* -1 = variable */ | |
1146 | const char *name; | |
1147 | } rp_cmd_args[] = { | |
1148 | [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, | |
1149 | [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, | |
1150 | [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, | |
1151 | [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, | |
1152 | }; | |
1153 | ||
1154 | /* | |
1155 | * Handles messages sent on the return path towards the source VM | |
1156 | * | |
1157 | */ | |
1158 | static void *source_return_path_thread(void *opaque) | |
1159 | { | |
1160 | MigrationState *ms = opaque; | |
1161 | QEMUFile *rp = ms->rp_state.from_dst_file; | |
1162 | uint16_t header_len, header_type; | |
1163 | const int max_len = 512; | |
1164 | uint8_t buf[max_len]; | |
1165 | uint32_t tmp32, sibling_error; | |
1166 | int res; | |
1167 | ||
1168 | trace_source_return_path_thread_entry(); | |
1169 | while (!ms->rp_state.error && !qemu_file_get_error(rp) && | |
1170 | migration_is_setup_or_active(ms->state)) { | |
1171 | trace_source_return_path_thread_loop_top(); | |
1172 | header_type = qemu_get_be16(rp); | |
1173 | header_len = qemu_get_be16(rp); | |
1174 | ||
1175 | if (header_type >= MIG_RP_MSG_MAX || | |
1176 | header_type == MIG_RP_MSG_INVALID) { | |
1177 | error_report("RP: Received invalid message 0x%04x length 0x%04x", | |
1178 | header_type, header_len); | |
1179 | mark_source_rp_bad(ms); | |
1180 | goto out; | |
1181 | } | |
1182 | ||
1183 | if ((rp_cmd_args[header_type].len != -1 && | |
1184 | header_len != rp_cmd_args[header_type].len) || | |
1185 | header_len > max_len) { | |
1186 | error_report("RP: Received '%s' message (0x%04x) with" | |
1187 | "incorrect length %d expecting %zu", | |
1188 | rp_cmd_args[header_type].name, header_type, header_len, | |
1189 | (size_t)rp_cmd_args[header_type].len); | |
1190 | mark_source_rp_bad(ms); | |
1191 | goto out; | |
1192 | } | |
1193 | ||
1194 | /* We know we've got a valid header by this point */ | |
1195 | res = qemu_get_buffer(rp, buf, header_len); | |
1196 | if (res != header_len) { | |
1197 | error_report("RP: Failed reading data for message 0x%04x" | |
1198 | " read %d expected %d", | |
1199 | header_type, res, header_len); | |
1200 | mark_source_rp_bad(ms); | |
1201 | goto out; | |
1202 | } | |
1203 | ||
1204 | /* OK, we have the message and the data */ | |
1205 | switch (header_type) { | |
1206 | case MIG_RP_MSG_SHUT: | |
1207 | sibling_error = be32_to_cpup((uint32_t *)buf); | |
1208 | trace_source_return_path_thread_shut(sibling_error); | |
1209 | if (sibling_error) { | |
1210 | error_report("RP: Sibling indicated error %d", sibling_error); | |
1211 | mark_source_rp_bad(ms); | |
1212 | } | |
1213 | /* | |
1214 | * We'll let the main thread deal with closing the RP | |
1215 | * we could do a shutdown(2) on it, but we're the only user | |
1216 | * anyway, so there's nothing gained. | |
1217 | */ | |
1218 | goto out; | |
1219 | ||
1220 | case MIG_RP_MSG_PONG: | |
1221 | tmp32 = be32_to_cpup((uint32_t *)buf); | |
1222 | trace_source_return_path_thread_pong(tmp32); | |
1223 | break; | |
1224 | ||
1225 | default: | |
1226 | break; | |
1227 | } | |
1228 | } | |
1229 | if (rp && qemu_file_get_error(rp)) { | |
1230 | trace_source_return_path_thread_bad_end(); | |
1231 | mark_source_rp_bad(ms); | |
1232 | } | |
1233 | ||
1234 | trace_source_return_path_thread_end(); | |
1235 | out: | |
1236 | ms->rp_state.from_dst_file = NULL; | |
1237 | qemu_fclose(rp); | |
1238 | return NULL; | |
1239 | } | |
1240 | ||
1241 | __attribute__ (( unused )) /* Until later in patch series */ | |
1242 | static int open_return_path_on_source(MigrationState *ms) | |
1243 | { | |
1244 | ||
1245 | ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->file); | |
1246 | if (!ms->rp_state.from_dst_file) { | |
1247 | return -1; | |
1248 | } | |
1249 | ||
1250 | trace_open_return_path_on_source(); | |
1251 | qemu_thread_create(&ms->rp_state.rp_thread, "return path", | |
1252 | source_return_path_thread, ms, QEMU_THREAD_JOINABLE); | |
1253 | ||
1254 | trace_open_return_path_on_source_continue(); | |
1255 | ||
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | __attribute__ (( unused )) /* Until later in patch series */ | |
1260 | /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ | |
1261 | static int await_return_path_close_on_source(MigrationState *ms) | |
1262 | { | |
1263 | /* | |
1264 | * If this is a normal exit then the destination will send a SHUT and the | |
1265 | * rp_thread will exit, however if there's an error we need to cause | |
1266 | * it to exit. | |
1267 | */ | |
1268 | if (qemu_file_get_error(ms->file) && ms->rp_state.from_dst_file) { | |
1269 | /* | |
1270 | * shutdown(2), if we have it, will cause it to unblock if it's stuck | |
1271 | * waiting for the destination. | |
1272 | */ | |
1273 | qemu_file_shutdown(ms->rp_state.from_dst_file); | |
1274 | mark_source_rp_bad(ms); | |
1275 | } | |
1276 | trace_await_return_path_close_on_source_joining(); | |
1277 | qemu_thread_join(&ms->rp_state.rp_thread); | |
1278 | trace_await_return_path_close_on_source_close(); | |
1279 | return ms->rp_state.error; | |
1280 | } | |
1281 | ||
09f6c85e DDAG |
1282 | /** |
1283 | * migration_completion: Used by migration_thread when there's not much left. | |
1284 | * The caller 'breaks' the loop when this returns. | |
1285 | * | |
1286 | * @s: Current migration state | |
36f48567 | 1287 | * @current_active_state: The migration state we expect to be in |
09f6c85e DDAG |
1288 | * @*old_vm_running: Pointer to old_vm_running flag |
1289 | * @*start_time: Pointer to time to update | |
1290 | */ | |
36f48567 DDAG |
1291 | static void migration_completion(MigrationState *s, int current_active_state, |
1292 | bool *old_vm_running, | |
09f6c85e DDAG |
1293 | int64_t *start_time) |
1294 | { | |
1295 | int ret; | |
1296 | ||
1297 | qemu_mutex_lock_iothread(); | |
1298 | *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1299 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
1300 | *old_vm_running = runstate_is_running(); | |
1301 | ||
1302 | ret = global_state_store(); | |
1303 | if (!ret) { | |
1304 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
1305 | if (ret >= 0) { | |
1306 | qemu_file_set_rate_limit(s->file, INT64_MAX); | |
a3e06c3d | 1307 | qemu_savevm_state_complete_precopy(s->file); |
09f6c85e DDAG |
1308 | } |
1309 | } | |
1310 | qemu_mutex_unlock_iothread(); | |
1311 | ||
1312 | if (ret < 0) { | |
1313 | goto fail; | |
1314 | } | |
1315 | ||
1316 | if (qemu_file_get_error(s->file)) { | |
1317 | trace_migration_completion_file_err(); | |
1318 | goto fail; | |
1319 | } | |
1320 | ||
36f48567 | 1321 | migrate_set_state(s, current_active_state, MIGRATION_STATUS_COMPLETED); |
09f6c85e DDAG |
1322 | return; |
1323 | ||
1324 | fail: | |
36f48567 | 1325 | migrate_set_state(s, current_active_state, MIGRATION_STATUS_FAILED); |
09f6c85e DDAG |
1326 | } |
1327 | ||
70b20477 DDAG |
1328 | /* |
1329 | * Master migration thread on the source VM. | |
1330 | * It drives the migration and pumps the data down the outgoing channel. | |
1331 | */ | |
5f496a1b | 1332 | static void *migration_thread(void *opaque) |
0d82d0e8 | 1333 | { |
9848a404 | 1334 | MigrationState *s = opaque; |
bc72ad67 AB |
1335 | int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
1336 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); | |
be7172e2 | 1337 | int64_t initial_bytes = 0; |
0d82d0e8 | 1338 | int64_t max_size = 0; |
a3fa1d78 | 1339 | int64_t start_time = initial_time; |
94f5a437 | 1340 | int64_t end_time; |
a3fa1d78 | 1341 | bool old_vm_running = false; |
76f5933a | 1342 | |
ab28bd23 PB |
1343 | rcu_register_thread(); |
1344 | ||
f796baa1 | 1345 | qemu_savevm_state_header(s->file); |
dba433c0 | 1346 | qemu_savevm_state_begin(s->file, &s->params); |
0d82d0e8 | 1347 | |
bc72ad67 | 1348 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; |
31194731 | 1349 | migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_ACTIVE); |
29ae8a41 | 1350 | |
9ec055ae DDAG |
1351 | trace_migration_thread_setup_complete(); |
1352 | ||
1353 | while (s->state == MIGRATION_STATUS_ACTIVE || | |
1354 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
a3e879cd | 1355 | int64_t current_time; |
c369f40d | 1356 | uint64_t pending_size; |
0d82d0e8 | 1357 | |
a0ff044b | 1358 | if (!qemu_file_rate_limit(s->file)) { |
c31b098f DDAG |
1359 | uint64_t pend_post, pend_nonpost; |
1360 | ||
1361 | qemu_savevm_state_pending(s->file, max_size, &pend_nonpost, | |
1362 | &pend_post); | |
1363 | pending_size = pend_nonpost + pend_post; | |
1364 | trace_migrate_pending(pending_size, max_size, | |
1365 | pend_post, pend_nonpost); | |
b22ff1fb | 1366 | if (pending_size && pending_size >= max_size) { |
dba433c0 | 1367 | qemu_savevm_state_iterate(s->file); |
c369f40d | 1368 | } else { |
09f6c85e | 1369 | trace_migration_thread_low_pending(pending_size); |
36f48567 DDAG |
1370 | migration_completion(s, MIGRATION_STATUS_ACTIVE, |
1371 | &old_vm_running, &start_time); | |
09f6c85e | 1372 | break; |
c369f40d JQ |
1373 | } |
1374 | } | |
f4410a5d | 1375 | |
fd45ee2c | 1376 | if (qemu_file_get_error(s->file)) { |
31194731 HZ |
1377 | migrate_set_state(s, MIGRATION_STATUS_ACTIVE, |
1378 | MIGRATION_STATUS_FAILED); | |
fd45ee2c PB |
1379 | break; |
1380 | } | |
bc72ad67 | 1381 | current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
0d82d0e8 | 1382 | if (current_time >= initial_time + BUFFER_DELAY) { |
be7172e2 | 1383 | uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes; |
77417f10 | 1384 | uint64_t time_spent = current_time - initial_time; |
0d82d0e8 JQ |
1385 | double bandwidth = transferred_bytes / time_spent; |
1386 | max_size = bandwidth * migrate_max_downtime() / 1000000; | |
1387 | ||
7e114f8c MH |
1388 | s->mbps = time_spent ? (((double) transferred_bytes * 8.0) / |
1389 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0 : -1; | |
1390 | ||
9013dca5 AK |
1391 | trace_migrate_transferred(transferred_bytes, time_spent, |
1392 | bandwidth, max_size); | |
90f8ae72 JQ |
1393 | /* if we haven't sent anything, we don't want to recalculate |
1394 | 10000 is a small enough number for our purposes */ | |
1395 | if (s->dirty_bytes_rate && transferred_bytes > 10000) { | |
1396 | s->expected_downtime = s->dirty_bytes_rate / bandwidth; | |
1397 | } | |
0d82d0e8 | 1398 | |
1964a397 | 1399 | qemu_file_reset_rate_limit(s->file); |
0d82d0e8 | 1400 | initial_time = current_time; |
be7172e2 | 1401 | initial_bytes = qemu_ftell(s->file); |
0d82d0e8 | 1402 | } |
a0ff044b | 1403 | if (qemu_file_rate_limit(s->file)) { |
0d82d0e8 JQ |
1404 | /* usleep expects microseconds */ |
1405 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
1406 | } | |
a3fa1d78 PB |
1407 | } |
1408 | ||
070afca2 JH |
1409 | /* If we enabled cpu throttling for auto-converge, turn it off. */ |
1410 | cpu_throttle_stop(); | |
94f5a437 | 1411 | end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
070afca2 | 1412 | |
f4410a5d | 1413 | qemu_mutex_lock_iothread(); |
ea7415fa | 1414 | qemu_savevm_state_cleanup(); |
31194731 | 1415 | if (s->state == MIGRATION_STATUS_COMPLETED) { |
d6ed7312 | 1416 | uint64_t transferred_bytes = qemu_ftell(s->file); |
a3fa1d78 PB |
1417 | s->total_time = end_time - s->total_time; |
1418 | s->downtime = end_time - start_time; | |
d6ed7312 PL |
1419 | if (s->total_time) { |
1420 | s->mbps = (((double) transferred_bytes * 8.0) / | |
1421 | ((double) s->total_time)) / 1000; | |
1422 | } | |
a3fa1d78 PB |
1423 | runstate_set(RUN_STATE_POSTMIGRATE); |
1424 | } else { | |
1425 | if (old_vm_running) { | |
a3fa1d78 | 1426 | vm_start(); |
dba433c0 | 1427 | } |
0d82d0e8 | 1428 | } |
bb1fadc4 | 1429 | qemu_bh_schedule(s->cleanup_bh); |
dba433c0 | 1430 | qemu_mutex_unlock_iothread(); |
f4410a5d | 1431 | |
ab28bd23 | 1432 | rcu_unregister_thread(); |
0d82d0e8 JQ |
1433 | return NULL; |
1434 | } | |
1435 | ||
9848a404 | 1436 | void migrate_fd_connect(MigrationState *s) |
0d82d0e8 | 1437 | { |
cc283e3b JQ |
1438 | /* This is a best 1st approximation. ns to ms */ |
1439 | s->expected_downtime = max_downtime/1000000; | |
bb1fadc4 | 1440 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); |
0d82d0e8 | 1441 | |
442773ce PB |
1442 | qemu_file_set_rate_limit(s->file, |
1443 | s->bandwidth_limit / XFER_LIMIT_RATIO); | |
1444 | ||
9287ac27 SH |
1445 | /* Notify before starting migration thread */ |
1446 | notifier_list_notify(&migration_state_notifiers, s); | |
1447 | ||
8706d2d5 | 1448 | migrate_compress_threads_create(); |
4900116e | 1449 | qemu_thread_create(&s->thread, "migration", migration_thread, s, |
bb1fadc4 | 1450 | QEMU_THREAD_JOINABLE); |
0d82d0e8 | 1451 | } |
093e3c42 DDAG |
1452 | |
1453 | PostcopyState postcopy_state_get(void) | |
1454 | { | |
1455 | return atomic_mb_read(&incoming_postcopy_state); | |
1456 | } | |
1457 | ||
1458 | /* Set the state and return the old state */ | |
1459 | PostcopyState postcopy_state_set(PostcopyState new_state) | |
1460 | { | |
1461 | return atomic_xchg(&incoming_postcopy_state, new_state); | |
1462 | } | |
1463 |