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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" | |
caf71f86 | 17 | #include "migration/migration.h" |
83c9089e | 18 | #include "monitor/monitor.h" |
0d82d0e8 | 19 | #include "migration/qemu-file.h" |
9c17d615 | 20 | #include "sysemu/sysemu.h" |
737e150e | 21 | #include "block/block.h" |
1de7afc9 | 22 | #include "qemu/sockets.h" |
caf71f86 | 23 | #include "migration/block.h" |
766bd176 | 24 | #include "qemu/thread.h" |
791e7c82 | 25 | #include "qmp-commands.h" |
c09e5bb1 | 26 | #include "trace.h" |
065e2813 AL |
27 | |
28 | //#define DEBUG_MIGRATION | |
29 | ||
30 | #ifdef DEBUG_MIGRATION | |
d0f2c4c6 | 31 | #define DPRINTF(fmt, ...) \ |
065e2813 AL |
32 | do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) |
33 | #else | |
d0f2c4c6 | 34 | #define DPRINTF(fmt, ...) \ |
065e2813 AL |
35 | do { } while (0) |
36 | #endif | |
5bb7910a | 37 | |
7dc688ed JQ |
38 | enum { |
39 | MIG_STATE_ERROR, | |
40 | MIG_STATE_SETUP, | |
41 | MIG_STATE_CANCELLED, | |
42 | MIG_STATE_ACTIVE, | |
43 | MIG_STATE_COMPLETED, | |
44 | }; | |
5bb7910a | 45 | |
d0ae46c1 | 46 | #define MAX_THROTTLE (32 << 20) /* Migration speed throttling */ |
5bb7910a | 47 | |
5b4e1eb7 JQ |
48 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled |
49 | * data. */ | |
50 | #define BUFFER_DELAY 100 | |
51 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
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 | ||
17549e84 JQ |
59 | /* When we add fault tolerance, we could have several |
60 | migrations at once. For now we don't need to add | |
61 | dynamic creation of migration */ | |
62 | ||
859bc756 | 63 | MigrationState *migrate_get_current(void) |
17549e84 JQ |
64 | { |
65 | static MigrationState current_migration = { | |
66 | .state = MIG_STATE_SETUP, | |
d0ae46c1 | 67 | .bandwidth_limit = MAX_THROTTLE, |
17ad9b35 | 68 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, |
17549e84 JQ |
69 | }; |
70 | ||
71 | return ¤t_migration; | |
72 | } | |
73 | ||
43eaae28 | 74 | void qemu_start_incoming_migration(const char *uri, Error **errp) |
5bb7910a | 75 | { |
34c9dd8e AL |
76 | const char *p; |
77 | ||
78 | if (strstart(uri, "tcp:", &p)) | |
43eaae28 | 79 | tcp_start_incoming_migration(p, errp); |
065e2813 AL |
80 | #if !defined(WIN32) |
81 | else if (strstart(uri, "exec:", &p)) | |
43eaae28 | 82 | exec_start_incoming_migration(p, errp); |
4951f65b | 83 | else if (strstart(uri, "unix:", &p)) |
43eaae28 | 84 | unix_start_incoming_migration(p, errp); |
5ac1fad3 | 85 | else if (strstart(uri, "fd:", &p)) |
43eaae28 | 86 | fd_start_incoming_migration(p, errp); |
065e2813 | 87 | #endif |
8ca5e801 | 88 | else { |
312fd5f2 | 89 | error_setg(errp, "unknown migration protocol: %s", uri); |
8ca5e801 | 90 | } |
5bb7910a AL |
91 | } |
92 | ||
82a4da79 | 93 | static void process_incoming_migration_co(void *opaque) |
511c0231 | 94 | { |
82a4da79 | 95 | QEMUFile *f = opaque; |
1c12e1f5 PB |
96 | int ret; |
97 | ||
98 | ret = qemu_loadvm_state(f); | |
99 | qemu_fclose(f); | |
100 | if (ret < 0) { | |
511c0231 JQ |
101 | fprintf(stderr, "load of migration failed\n"); |
102 | exit(0); | |
103 | } | |
104 | qemu_announce_self(); | |
105 | DPRINTF("successfully loaded vm state\n"); | |
106 | ||
901862cb | 107 | bdrv_clear_incoming_migration_all(); |
0f15423c AL |
108 | /* Make sure all file formats flush their mutable metadata */ |
109 | bdrv_invalidate_cache_all(); | |
110 | ||
f5bbfba1 | 111 | if (autostart) { |
511c0231 | 112 | vm_start(); |
f5bbfba1 | 113 | } else { |
29ed72f1 | 114 | runstate_set(RUN_STATE_PAUSED); |
f5bbfba1 | 115 | } |
511c0231 JQ |
116 | } |
117 | ||
82a4da79 PB |
118 | void process_incoming_migration(QEMUFile *f) |
119 | { | |
120 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); | |
121 | int fd = qemu_get_fd(f); | |
122 | ||
123 | assert(fd != -1); | |
124 | socket_set_nonblock(fd); | |
82a4da79 PB |
125 | qemu_coroutine_enter(co, f); |
126 | } | |
127 | ||
a0a3fd60 GC |
128 | /* amount of nanoseconds we are willing to wait for migration to be down. |
129 | * the choice of nanoseconds is because it is the maximum resolution that | |
130 | * get_clock() can achieve. It is an internal measure. All user-visible | |
131 | * units must be in seconds */ | |
132 | static uint64_t max_downtime = 30000000; | |
133 | ||
134 | uint64_t migrate_max_downtime(void) | |
135 | { | |
136 | return max_downtime; | |
137 | } | |
138 | ||
bbf6da32 OW |
139 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) |
140 | { | |
141 | MigrationCapabilityStatusList *head = NULL; | |
142 | MigrationCapabilityStatusList *caps; | |
143 | MigrationState *s = migrate_get_current(); | |
144 | int i; | |
145 | ||
146 | for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) { | |
147 | if (head == NULL) { | |
148 | head = g_malloc0(sizeof(*caps)); | |
149 | caps = head; | |
150 | } else { | |
151 | caps->next = g_malloc0(sizeof(*caps)); | |
152 | caps = caps->next; | |
153 | } | |
154 | caps->value = | |
155 | g_malloc(sizeof(*caps->value)); | |
156 | caps->value->capability = i; | |
157 | caps->value->state = s->enabled_capabilities[i]; | |
158 | } | |
159 | ||
160 | return head; | |
161 | } | |
162 | ||
f36d55af OW |
163 | static void get_xbzrle_cache_stats(MigrationInfo *info) |
164 | { | |
165 | if (migrate_use_xbzrle()) { | |
166 | info->has_xbzrle_cache = true; | |
167 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
168 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
169 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
170 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
171 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
172 | info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); | |
173 | } | |
174 | } | |
175 | ||
791e7c82 | 176 | MigrationInfo *qmp_query_migrate(Error **errp) |
5bb7910a | 177 | { |
791e7c82 | 178 | MigrationInfo *info = g_malloc0(sizeof(*info)); |
17549e84 JQ |
179 | MigrationState *s = migrate_get_current(); |
180 | ||
181 | switch (s->state) { | |
182 | case MIG_STATE_SETUP: | |
183 | /* no migration has happened ever */ | |
184 | break; | |
185 | case MIG_STATE_ACTIVE: | |
791e7c82 LC |
186 | info->has_status = true; |
187 | info->status = g_strdup("active"); | |
7aa939af JQ |
188 | info->has_total_time = true; |
189 | info->total_time = qemu_get_clock_ms(rt_clock) | |
190 | - s->total_time; | |
2c52ddf1 JQ |
191 | info->has_expected_downtime = true; |
192 | info->expected_downtime = s->expected_downtime; | |
17549e84 | 193 | |
791e7c82 LC |
194 | info->has_ram = true; |
195 | info->ram = g_malloc0(sizeof(*info->ram)); | |
196 | info->ram->transferred = ram_bytes_transferred(); | |
197 | info->ram->remaining = ram_bytes_remaining(); | |
198 | info->ram->total = ram_bytes_total(); | |
004d4c10 OW |
199 | info->ram->duplicate = dup_mig_pages_transferred(); |
200 | info->ram->normal = norm_mig_pages_transferred(); | |
201 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
8d017193 JQ |
202 | info->ram->dirty_pages_rate = s->dirty_pages_rate; |
203 | ||
17549e84 JQ |
204 | |
205 | if (blk_mig_active()) { | |
791e7c82 LC |
206 | info->has_disk = true; |
207 | info->disk = g_malloc0(sizeof(*info->disk)); | |
208 | info->disk->transferred = blk_mig_bytes_transferred(); | |
209 | info->disk->remaining = blk_mig_bytes_remaining(); | |
210 | info->disk->total = blk_mig_bytes_total(); | |
ff8d81d8 | 211 | } |
f36d55af OW |
212 | |
213 | get_xbzrle_cache_stats(info); | |
17549e84 JQ |
214 | break; |
215 | case MIG_STATE_COMPLETED: | |
f36d55af OW |
216 | get_xbzrle_cache_stats(info); |
217 | ||
791e7c82 LC |
218 | info->has_status = true; |
219 | info->status = g_strdup("completed"); | |
7aa939af | 220 | info->total_time = s->total_time; |
9c5a9fcf JQ |
221 | info->has_downtime = true; |
222 | info->downtime = s->downtime; | |
d5f8a570 JQ |
223 | |
224 | info->has_ram = true; | |
225 | info->ram = g_malloc0(sizeof(*info->ram)); | |
226 | info->ram->transferred = ram_bytes_transferred(); | |
227 | info->ram->remaining = 0; | |
228 | info->ram->total = ram_bytes_total(); | |
004d4c10 OW |
229 | info->ram->duplicate = dup_mig_pages_transferred(); |
230 | info->ram->normal = norm_mig_pages_transferred(); | |
231 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
17549e84 JQ |
232 | break; |
233 | case MIG_STATE_ERROR: | |
791e7c82 LC |
234 | info->has_status = true; |
235 | info->status = g_strdup("failed"); | |
17549e84 JQ |
236 | break; |
237 | case MIG_STATE_CANCELLED: | |
791e7c82 LC |
238 | info->has_status = true; |
239 | info->status = g_strdup("cancelled"); | |
17549e84 | 240 | break; |
5bb7910a | 241 | } |
791e7c82 LC |
242 | |
243 | return info; | |
5bb7910a AL |
244 | } |
245 | ||
00458433 OW |
246 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, |
247 | Error **errp) | |
248 | { | |
249 | MigrationState *s = migrate_get_current(); | |
250 | MigrationCapabilityStatusList *cap; | |
251 | ||
252 | if (s->state == MIG_STATE_ACTIVE) { | |
253 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
254 | return; | |
255 | } | |
256 | ||
257 | for (cap = params; cap; cap = cap->next) { | |
258 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
259 | } | |
260 | } | |
261 | ||
065e2813 AL |
262 | /* shared migration helpers */ |
263 | ||
bb1fadc4 | 264 | static void migrate_fd_cleanup(void *opaque) |
065e2813 | 265 | { |
bb1fadc4 PB |
266 | MigrationState *s = opaque; |
267 | ||
268 | qemu_bh_delete(s->cleanup_bh); | |
269 | s->cleanup_bh = NULL; | |
270 | ||
065e2813 | 271 | if (s->file) { |
d0f2c4c6 | 272 | DPRINTF("closing file\n"); |
a3fa1d78 | 273 | qemu_fclose(s->file); |
5d39c799 | 274 | s->file = NULL; |
065e2813 AL |
275 | } |
276 | ||
f8bbc128 | 277 | assert(s->migration_file == NULL); |
a3fa1d78 | 278 | assert(s->state != MIG_STATE_ACTIVE); |
7a2c1721 | 279 | |
a3fa1d78 | 280 | if (s->state != MIG_STATE_COMPLETED) { |
7a2c1721 PB |
281 | qemu_savevm_state_cancel(); |
282 | } | |
a3fa1d78 PB |
283 | |
284 | notifier_list_notify(&migration_state_notifiers, s); | |
065e2813 AL |
285 | } |
286 | ||
f4410a5d PB |
287 | static void migrate_finish_set_state(MigrationState *s, int new_state) |
288 | { | |
289 | if (__sync_val_compare_and_swap(&s->state, MIG_STATE_ACTIVE, | |
290 | new_state) == new_state) { | |
291 | trace_migrate_set_state(new_state); | |
292 | } | |
293 | } | |
294 | ||
8b6b99b3 | 295 | void migrate_fd_error(MigrationState *s) |
065e2813 | 296 | { |
8b6b99b3 | 297 | DPRINTF("setting error state\n"); |
bb1fadc4 PB |
298 | assert(s->file == NULL); |
299 | s->state = MIG_STATE_ERROR; | |
300 | trace_migrate_set_state(MIG_STATE_ERROR); | |
301 | notifier_list_notify(&migration_state_notifiers, s); | |
458cf28e JQ |
302 | } |
303 | ||
0edda1c4 | 304 | static void migrate_fd_cancel(MigrationState *s) |
065e2813 | 305 | { |
d0f2c4c6 | 306 | DPRINTF("cancelling migration\n"); |
065e2813 | 307 | |
f4410a5d | 308 | migrate_finish_set_state(s, MIG_STATE_CANCELLED); |
065e2813 AL |
309 | } |
310 | ||
11c76741 | 311 | int migrate_fd_close(MigrationState *s) |
065e2813 | 312 | { |
8dc592e6 | 313 | int rc = 0; |
f8bbc128 PB |
314 | if (s->migration_file != NULL) { |
315 | rc = qemu_fclose(s->migration_file); | |
316 | s->migration_file = NULL; | |
8dc592e6 PB |
317 | } |
318 | return rc; | |
065e2813 | 319 | } |
99a0db9b GH |
320 | |
321 | void add_migration_state_change_notifier(Notifier *notify) | |
322 | { | |
323 | notifier_list_add(&migration_state_notifiers, notify); | |
324 | } | |
325 | ||
326 | void remove_migration_state_change_notifier(Notifier *notify) | |
327 | { | |
31552529 | 328 | notifier_remove(notify); |
99a0db9b GH |
329 | } |
330 | ||
afe2df69 GH |
331 | bool migration_is_active(MigrationState *s) |
332 | { | |
333 | return s->state == MIG_STATE_ACTIVE; | |
334 | } | |
335 | ||
7073693b | 336 | bool migration_has_finished(MigrationState *s) |
99a0db9b | 337 | { |
7073693b | 338 | return s->state == MIG_STATE_COMPLETED; |
99a0db9b | 339 | } |
0edda1c4 | 340 | |
afe2df69 GH |
341 | bool migration_has_failed(MigrationState *s) |
342 | { | |
343 | return (s->state == MIG_STATE_CANCELLED || | |
344 | s->state == MIG_STATE_ERROR); | |
345 | } | |
346 | ||
6607ae23 | 347 | static MigrationState *migrate_init(const MigrationParams *params) |
0edda1c4 | 348 | { |
17549e84 | 349 | MigrationState *s = migrate_get_current(); |
d0ae46c1 | 350 | int64_t bandwidth_limit = s->bandwidth_limit; |
bbf6da32 | 351 | bool enabled_capabilities[MIGRATION_CAPABILITY_MAX]; |
17ad9b35 | 352 | int64_t xbzrle_cache_size = s->xbzrle_cache_size; |
bbf6da32 OW |
353 | |
354 | memcpy(enabled_capabilities, s->enabled_capabilities, | |
355 | sizeof(enabled_capabilities)); | |
0edda1c4 | 356 | |
17549e84 | 357 | memset(s, 0, sizeof(*s)); |
d0ae46c1 | 358 | s->bandwidth_limit = bandwidth_limit; |
6607ae23 | 359 | s->params = *params; |
bbf6da32 OW |
360 | memcpy(s->enabled_capabilities, enabled_capabilities, |
361 | sizeof(enabled_capabilities)); | |
17ad9b35 | 362 | s->xbzrle_cache_size = xbzrle_cache_size; |
1299c631 | 363 | |
0edda1c4 | 364 | s->bandwidth_limit = bandwidth_limit; |
d5934dde | 365 | s->state = MIG_STATE_SETUP; |
c09e5bb1 | 366 | trace_migrate_set_state(MIG_STATE_SETUP); |
0edda1c4 | 367 | |
c09e5bb1 | 368 | s->total_time = qemu_get_clock_ms(rt_clock); |
0edda1c4 JQ |
369 | return s; |
370 | } | |
cab30143 | 371 | |
fa2756b7 AL |
372 | static GSList *migration_blockers; |
373 | ||
374 | void migrate_add_blocker(Error *reason) | |
375 | { | |
376 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
377 | } | |
378 | ||
379 | void migrate_del_blocker(Error *reason) | |
380 | { | |
381 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
382 | } | |
383 | ||
e1c37d0e LC |
384 | void qmp_migrate(const char *uri, bool has_blk, bool blk, |
385 | bool has_inc, bool inc, bool has_detach, bool detach, | |
386 | Error **errp) | |
cab30143 | 387 | { |
be7059cd | 388 | Error *local_err = NULL; |
17549e84 | 389 | MigrationState *s = migrate_get_current(); |
6607ae23 | 390 | MigrationParams params; |
cab30143 | 391 | const char *p; |
cab30143 | 392 | |
6607ae23 IY |
393 | params.blk = blk; |
394 | params.shared = inc; | |
395 | ||
17549e84 | 396 | if (s->state == MIG_STATE_ACTIVE) { |
e1c37d0e LC |
397 | error_set(errp, QERR_MIGRATION_ACTIVE); |
398 | return; | |
cab30143 JQ |
399 | } |
400 | ||
e1c37d0e LC |
401 | if (qemu_savevm_state_blocked(errp)) { |
402 | return; | |
cab30143 JQ |
403 | } |
404 | ||
fa2756b7 | 405 | if (migration_blockers) { |
e1c37d0e LC |
406 | *errp = error_copy(migration_blockers->data); |
407 | return; | |
fa2756b7 AL |
408 | } |
409 | ||
6607ae23 | 410 | s = migrate_init(¶ms); |
cab30143 JQ |
411 | |
412 | if (strstart(uri, "tcp:", &p)) { | |
f37afb5a | 413 | tcp_start_outgoing_migration(s, p, &local_err); |
cab30143 JQ |
414 | #if !defined(WIN32) |
415 | } else if (strstart(uri, "exec:", &p)) { | |
f37afb5a | 416 | exec_start_outgoing_migration(s, p, &local_err); |
cab30143 | 417 | } else if (strstart(uri, "unix:", &p)) { |
f37afb5a | 418 | unix_start_outgoing_migration(s, p, &local_err); |
cab30143 | 419 | } else if (strstart(uri, "fd:", &p)) { |
f37afb5a | 420 | fd_start_outgoing_migration(s, p, &local_err); |
cab30143 | 421 | #endif |
99a0db9b | 422 | } else { |
e1c37d0e LC |
423 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol"); |
424 | return; | |
cab30143 JQ |
425 | } |
426 | ||
f37afb5a | 427 | if (local_err) { |
342ab8d1 | 428 | migrate_fd_error(s); |
f37afb5a | 429 | error_propagate(errp, local_err); |
e1c37d0e | 430 | return; |
1299c631 | 431 | } |
cab30143 JQ |
432 | } |
433 | ||
6cdedb07 | 434 | void qmp_migrate_cancel(Error **errp) |
cab30143 | 435 | { |
17549e84 | 436 | migrate_fd_cancel(migrate_get_current()); |
cab30143 JQ |
437 | } |
438 | ||
9e1ba4cc OW |
439 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) |
440 | { | |
441 | MigrationState *s = migrate_get_current(); | |
442 | ||
443 | /* Check for truncation */ | |
444 | if (value != (size_t)value) { | |
445 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
446 | "exceeding address space"); | |
447 | return; | |
448 | } | |
449 | ||
450 | s->xbzrle_cache_size = xbzrle_cache_resize(value); | |
451 | } | |
452 | ||
453 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
454 | { | |
455 | return migrate_xbzrle_cache_size(); | |
456 | } | |
457 | ||
3dc85383 | 458 | void qmp_migrate_set_speed(int64_t value, Error **errp) |
cab30143 | 459 | { |
cab30143 JQ |
460 | MigrationState *s; |
461 | ||
3dc85383 LC |
462 | if (value < 0) { |
463 | value = 0; | |
99a0db9b | 464 | } |
cab30143 | 465 | |
17549e84 | 466 | s = migrate_get_current(); |
3dc85383 | 467 | s->bandwidth_limit = value; |
d0ae46c1 | 468 | qemu_file_set_rate_limit(s->file, s->bandwidth_limit); |
cab30143 JQ |
469 | } |
470 | ||
4f0a993b | 471 | void qmp_migrate_set_downtime(double value, Error **errp) |
cab30143 | 472 | { |
4f0a993b LC |
473 | value *= 1e9; |
474 | value = MAX(0, MIN(UINT64_MAX, value)); | |
475 | max_downtime = (uint64_t)value; | |
99a0db9b | 476 | } |
17ad9b35 OW |
477 | |
478 | int migrate_use_xbzrle(void) | |
479 | { | |
480 | MigrationState *s; | |
481 | ||
482 | s = migrate_get_current(); | |
483 | ||
484 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
485 | } | |
486 | ||
487 | int64_t migrate_xbzrle_cache_size(void) | |
488 | { | |
489 | MigrationState *s; | |
490 | ||
491 | s = migrate_get_current(); | |
492 | ||
493 | return s->xbzrle_cache_size; | |
494 | } | |
0d82d0e8 JQ |
495 | |
496 | /* migration thread support */ | |
497 | ||
5f496a1b | 498 | static int migration_put_buffer(void *opaque, const uint8_t *buf, |
0d82d0e8 JQ |
499 | int64_t pos, int size) |
500 | { | |
9848a404 | 501 | MigrationState *s = opaque; |
e6a1cf21 | 502 | int ret; |
0d82d0e8 JQ |
503 | |
504 | DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos); | |
505 | ||
0d82d0e8 JQ |
506 | if (size <= 0) { |
507 | return size; | |
508 | } | |
509 | ||
e6a1cf21 PB |
510 | qemu_put_buffer(s->migration_file, buf, size); |
511 | ret = qemu_file_get_error(s->migration_file); | |
512 | if (ret) { | |
513 | return ret; | |
0d82d0e8 JQ |
514 | } |
515 | ||
e6a1cf21 PB |
516 | s->bytes_xfer += size; |
517 | return size; | |
0d82d0e8 JQ |
518 | } |
519 | ||
5f496a1b | 520 | static int migration_close(void *opaque) |
0d82d0e8 | 521 | { |
9848a404 | 522 | MigrationState *s = opaque; |
0d82d0e8 JQ |
523 | |
524 | DPRINTF("closing\n"); | |
525 | ||
bb1fadc4 PB |
526 | qemu_mutex_unlock_iothread(); |
527 | qemu_thread_join(&s->thread); | |
528 | qemu_mutex_lock_iothread(); | |
529 | assert(s->state != MIG_STATE_ACTIVE); | |
530 | ||
63dfbd7e | 531 | return migrate_fd_close(s); |
0d82d0e8 JQ |
532 | } |
533 | ||
5f496a1b | 534 | static int migration_get_fd(void *opaque) |
0d82d0e8 | 535 | { |
9848a404 | 536 | MigrationState *s = opaque; |
0d82d0e8 | 537 | |
e6a1cf21 | 538 | return qemu_get_fd(s->migration_file); |
0d82d0e8 JQ |
539 | } |
540 | ||
541 | /* | |
542 | * The meaning of the return values is: | |
543 | * 0: We can continue sending | |
544 | * 1: Time to stop | |
545 | * negative: There has been an error | |
546 | */ | |
5f496a1b | 547 | static int migration_rate_limit(void *opaque) |
0d82d0e8 | 548 | { |
9848a404 | 549 | MigrationState *s = opaque; |
0d82d0e8 JQ |
550 | int ret; |
551 | ||
552 | ret = qemu_file_get_error(s->file); | |
553 | if (ret) { | |
554 | return ret; | |
555 | } | |
556 | ||
1e973051 | 557 | if (s->bytes_xfer >= s->xfer_limit) { |
0d82d0e8 JQ |
558 | return 1; |
559 | } | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
5f496a1b | 564 | static int64_t migration_set_rate_limit(void *opaque, int64_t new_rate) |
0d82d0e8 | 565 | { |
9848a404 | 566 | MigrationState *s = opaque; |
0d82d0e8 JQ |
567 | if (qemu_file_get_error(s->file)) { |
568 | goto out; | |
569 | } | |
570 | if (new_rate > SIZE_MAX) { | |
571 | new_rate = SIZE_MAX; | |
572 | } | |
573 | ||
f65a8747 | 574 | s->xfer_limit = new_rate / XFER_LIMIT_RATIO; |
0d82d0e8 JQ |
575 | |
576 | out: | |
577 | return s->xfer_limit; | |
578 | } | |
579 | ||
5f496a1b | 580 | static int64_t migration_get_rate_limit(void *opaque) |
0d82d0e8 | 581 | { |
9848a404 | 582 | MigrationState *s = opaque; |
0d82d0e8 JQ |
583 | |
584 | return s->xfer_limit; | |
585 | } | |
586 | ||
5f496a1b | 587 | static void *migration_thread(void *opaque) |
0d82d0e8 | 588 | { |
9848a404 | 589 | MigrationState *s = opaque; |
0d82d0e8 | 590 | int64_t initial_time = qemu_get_clock_ms(rt_clock); |
7161082c | 591 | int64_t sleep_time = 0; |
be7172e2 | 592 | int64_t initial_bytes = 0; |
0d82d0e8 | 593 | int64_t max_size = 0; |
a3fa1d78 PB |
594 | int64_t start_time = initial_time; |
595 | bool old_vm_running = false; | |
76f5933a | 596 | |
76f5933a | 597 | DPRINTF("beginning savevm\n"); |
dba433c0 | 598 | qemu_savevm_state_begin(s->file, &s->params); |
0d82d0e8 | 599 | |
dba433c0 | 600 | while (s->state == MIG_STATE_ACTIVE) { |
a3e879cd | 601 | int64_t current_time; |
c369f40d | 602 | uint64_t pending_size; |
0d82d0e8 | 603 | |
a0ff044b | 604 | if (!qemu_file_rate_limit(s->file)) { |
c369f40d JQ |
605 | DPRINTF("iterate\n"); |
606 | pending_size = qemu_savevm_state_pending(s->file, max_size); | |
607 | DPRINTF("pending size %lu max %lu\n", pending_size, max_size); | |
b22ff1fb | 608 | if (pending_size && pending_size >= max_size) { |
dba433c0 | 609 | qemu_savevm_state_iterate(s->file); |
c369f40d | 610 | } else { |
c369f40d | 611 | DPRINTF("done iterating\n"); |
32c835ba | 612 | qemu_mutex_lock_iothread(); |
c369f40d JQ |
613 | start_time = qemu_get_clock_ms(rt_clock); |
614 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
a3fa1d78 | 615 | old_vm_running = runstate_is_running(); |
891518ab | 616 | vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); |
a3fa1d78 | 617 | s->xfer_limit = INT_MAX; |
dba433c0 | 618 | qemu_savevm_state_complete(s->file); |
32c835ba | 619 | qemu_mutex_unlock_iothread(); |
059f896c PB |
620 | if (!qemu_file_get_error(s->file)) { |
621 | migrate_finish_set_state(s, MIG_STATE_COMPLETED); | |
622 | break; | |
623 | } | |
c369f40d JQ |
624 | } |
625 | } | |
f4410a5d | 626 | |
fd45ee2c PB |
627 | if (qemu_file_get_error(s->file)) { |
628 | migrate_finish_set_state(s, MIG_STATE_ERROR); | |
629 | break; | |
630 | } | |
a3e879cd | 631 | current_time = qemu_get_clock_ms(rt_clock); |
0d82d0e8 | 632 | if (current_time >= initial_time + BUFFER_DELAY) { |
be7172e2 | 633 | uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes; |
7161082c | 634 | uint64_t time_spent = current_time - initial_time - sleep_time; |
0d82d0e8 JQ |
635 | double bandwidth = transferred_bytes / time_spent; |
636 | max_size = bandwidth * migrate_max_downtime() / 1000000; | |
637 | ||
638 | DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64 | |
639 | " bandwidth %g max_size %" PRId64 "\n", | |
640 | transferred_bytes, time_spent, bandwidth, max_size); | |
90f8ae72 JQ |
641 | /* if we haven't sent anything, we don't want to recalculate |
642 | 10000 is a small enough number for our purposes */ | |
643 | if (s->dirty_bytes_rate && transferred_bytes > 10000) { | |
644 | s->expected_downtime = s->dirty_bytes_rate / bandwidth; | |
645 | } | |
0d82d0e8 JQ |
646 | |
647 | s->bytes_xfer = 0; | |
7161082c | 648 | sleep_time = 0; |
0d82d0e8 | 649 | initial_time = current_time; |
be7172e2 | 650 | initial_bytes = qemu_ftell(s->file); |
0d82d0e8 | 651 | } |
a0ff044b | 652 | if (qemu_file_rate_limit(s->file)) { |
0d82d0e8 JQ |
653 | /* usleep expects microseconds */ |
654 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
7161082c | 655 | sleep_time += qemu_get_clock_ms(rt_clock) - current_time; |
0d82d0e8 | 656 | } |
a3fa1d78 PB |
657 | } |
658 | ||
f4410a5d | 659 | qemu_mutex_lock_iothread(); |
a3fa1d78 PB |
660 | if (s->state == MIG_STATE_COMPLETED) { |
661 | int64_t end_time = qemu_get_clock_ms(rt_clock); | |
662 | s->total_time = end_time - s->total_time; | |
663 | s->downtime = end_time - start_time; | |
664 | runstate_set(RUN_STATE_POSTMIGRATE); | |
665 | } else { | |
666 | if (old_vm_running) { | |
a3fa1d78 | 667 | vm_start(); |
dba433c0 | 668 | } |
0d82d0e8 | 669 | } |
bb1fadc4 | 670 | qemu_bh_schedule(s->cleanup_bh); |
dba433c0 | 671 | qemu_mutex_unlock_iothread(); |
f4410a5d | 672 | |
0d82d0e8 JQ |
673 | return NULL; |
674 | } | |
675 | ||
5f496a1b JQ |
676 | static const QEMUFileOps migration_file_ops = { |
677 | .get_fd = migration_get_fd, | |
678 | .put_buffer = migration_put_buffer, | |
679 | .close = migration_close, | |
680 | .rate_limit = migration_rate_limit, | |
681 | .get_rate_limit = migration_get_rate_limit, | |
682 | .set_rate_limit = migration_set_rate_limit, | |
0d82d0e8 JQ |
683 | }; |
684 | ||
9848a404 | 685 | void migrate_fd_connect(MigrationState *s) |
0d82d0e8 | 686 | { |
9848a404 | 687 | s->state = MIG_STATE_ACTIVE; |
c09e5bb1 KS |
688 | trace_migrate_set_state(MIG_STATE_ACTIVE); |
689 | ||
9848a404 | 690 | s->bytes_xfer = 0; |
cc283e3b JQ |
691 | /* This is a best 1st approximation. ns to ms */ |
692 | s->expected_downtime = max_downtime/1000000; | |
0d82d0e8 | 693 | |
9848a404 | 694 | s->xfer_limit = s->bandwidth_limit / XFER_LIMIT_RATIO; |
0d82d0e8 | 695 | |
bb1fadc4 | 696 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); |
5f496a1b | 697 | s->file = qemu_fopen_ops(s, &migration_file_ops); |
0d82d0e8 | 698 | |
5f496a1b | 699 | qemu_thread_create(&s->thread, migration_thread, s, |
bb1fadc4 | 700 | QEMU_THREAD_JOINABLE); |
0d3b26f5 | 701 | notifier_list_notify(&migration_state_notifiers, s); |
0d82d0e8 | 702 | } |