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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" |
065e2813 AL |
26 | |
27 | //#define DEBUG_MIGRATION | |
28 | ||
29 | #ifdef DEBUG_MIGRATION | |
d0f2c4c6 | 30 | #define DPRINTF(fmt, ...) \ |
065e2813 AL |
31 | do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) |
32 | #else | |
d0f2c4c6 | 33 | #define DPRINTF(fmt, ...) \ |
065e2813 AL |
34 | do { } while (0) |
35 | #endif | |
5bb7910a | 36 | |
7dc688ed JQ |
37 | enum { |
38 | MIG_STATE_ERROR, | |
39 | MIG_STATE_SETUP, | |
40 | MIG_STATE_CANCELLED, | |
41 | MIG_STATE_ACTIVE, | |
42 | MIG_STATE_COMPLETED, | |
43 | }; | |
5bb7910a | 44 | |
d0ae46c1 | 45 | #define MAX_THROTTLE (32 << 20) /* Migration speed throttling */ |
5bb7910a | 46 | |
5b4e1eb7 JQ |
47 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled |
48 | * data. */ | |
49 | #define BUFFER_DELAY 100 | |
50 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
51 | ||
17ad9b35 OW |
52 | /* Migration XBZRLE default cache size */ |
53 | #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) | |
54 | ||
99a0db9b GH |
55 | static NotifierList migration_state_notifiers = |
56 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
57 | ||
17549e84 JQ |
58 | /* When we add fault tolerance, we could have several |
59 | migrations at once. For now we don't need to add | |
60 | dynamic creation of migration */ | |
61 | ||
859bc756 | 62 | MigrationState *migrate_get_current(void) |
17549e84 JQ |
63 | { |
64 | static MigrationState current_migration = { | |
65 | .state = MIG_STATE_SETUP, | |
d0ae46c1 | 66 | .bandwidth_limit = MAX_THROTTLE, |
17ad9b35 | 67 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, |
17549e84 JQ |
68 | }; |
69 | ||
70 | return ¤t_migration; | |
71 | } | |
72 | ||
43eaae28 | 73 | void qemu_start_incoming_migration(const char *uri, Error **errp) |
5bb7910a | 74 | { |
34c9dd8e AL |
75 | const char *p; |
76 | ||
77 | if (strstart(uri, "tcp:", &p)) | |
43eaae28 | 78 | tcp_start_incoming_migration(p, errp); |
065e2813 AL |
79 | #if !defined(WIN32) |
80 | else if (strstart(uri, "exec:", &p)) | |
43eaae28 | 81 | exec_start_incoming_migration(p, errp); |
4951f65b | 82 | else if (strstart(uri, "unix:", &p)) |
43eaae28 | 83 | unix_start_incoming_migration(p, errp); |
5ac1fad3 | 84 | else if (strstart(uri, "fd:", &p)) |
43eaae28 | 85 | fd_start_incoming_migration(p, errp); |
065e2813 | 86 | #endif |
8ca5e801 | 87 | else { |
312fd5f2 | 88 | error_setg(errp, "unknown migration protocol: %s", uri); |
8ca5e801 | 89 | } |
5bb7910a AL |
90 | } |
91 | ||
82a4da79 | 92 | static void process_incoming_migration_co(void *opaque) |
511c0231 | 93 | { |
82a4da79 | 94 | QEMUFile *f = opaque; |
1c12e1f5 PB |
95 | int ret; |
96 | ||
97 | ret = qemu_loadvm_state(f); | |
98 | qemu_fclose(f); | |
99 | if (ret < 0) { | |
511c0231 JQ |
100 | fprintf(stderr, "load of migration failed\n"); |
101 | exit(0); | |
102 | } | |
103 | qemu_announce_self(); | |
104 | DPRINTF("successfully loaded vm state\n"); | |
105 | ||
901862cb | 106 | bdrv_clear_incoming_migration_all(); |
0f15423c AL |
107 | /* Make sure all file formats flush their mutable metadata */ |
108 | bdrv_invalidate_cache_all(); | |
109 | ||
f5bbfba1 | 110 | if (autostart) { |
511c0231 | 111 | vm_start(); |
f5bbfba1 | 112 | } else { |
29ed72f1 | 113 | runstate_set(RUN_STATE_PAUSED); |
f5bbfba1 | 114 | } |
511c0231 JQ |
115 | } |
116 | ||
82a4da79 PB |
117 | void process_incoming_migration(QEMUFile *f) |
118 | { | |
119 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); | |
120 | int fd = qemu_get_fd(f); | |
121 | ||
122 | assert(fd != -1); | |
123 | socket_set_nonblock(fd); | |
82a4da79 PB |
124 | qemu_coroutine_enter(co, f); |
125 | } | |
126 | ||
a0a3fd60 GC |
127 | /* amount of nanoseconds we are willing to wait for migration to be down. |
128 | * the choice of nanoseconds is because it is the maximum resolution that | |
129 | * get_clock() can achieve. It is an internal measure. All user-visible | |
130 | * units must be in seconds */ | |
131 | static uint64_t max_downtime = 30000000; | |
132 | ||
133 | uint64_t migrate_max_downtime(void) | |
134 | { | |
135 | return max_downtime; | |
136 | } | |
137 | ||
bbf6da32 OW |
138 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) |
139 | { | |
140 | MigrationCapabilityStatusList *head = NULL; | |
141 | MigrationCapabilityStatusList *caps; | |
142 | MigrationState *s = migrate_get_current(); | |
143 | int i; | |
144 | ||
145 | for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) { | |
146 | if (head == NULL) { | |
147 | head = g_malloc0(sizeof(*caps)); | |
148 | caps = head; | |
149 | } else { | |
150 | caps->next = g_malloc0(sizeof(*caps)); | |
151 | caps = caps->next; | |
152 | } | |
153 | caps->value = | |
154 | g_malloc(sizeof(*caps->value)); | |
155 | caps->value->capability = i; | |
156 | caps->value->state = s->enabled_capabilities[i]; | |
157 | } | |
158 | ||
159 | return head; | |
160 | } | |
161 | ||
f36d55af OW |
162 | static void get_xbzrle_cache_stats(MigrationInfo *info) |
163 | { | |
164 | if (migrate_use_xbzrle()) { | |
165 | info->has_xbzrle_cache = true; | |
166 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
167 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
168 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
169 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
170 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
171 | info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); | |
172 | } | |
173 | } | |
174 | ||
791e7c82 | 175 | MigrationInfo *qmp_query_migrate(Error **errp) |
5bb7910a | 176 | { |
791e7c82 | 177 | MigrationInfo *info = g_malloc0(sizeof(*info)); |
17549e84 JQ |
178 | MigrationState *s = migrate_get_current(); |
179 | ||
180 | switch (s->state) { | |
181 | case MIG_STATE_SETUP: | |
182 | /* no migration has happened ever */ | |
183 | break; | |
184 | case MIG_STATE_ACTIVE: | |
791e7c82 LC |
185 | info->has_status = true; |
186 | info->status = g_strdup("active"); | |
7aa939af JQ |
187 | info->has_total_time = true; |
188 | info->total_time = qemu_get_clock_ms(rt_clock) | |
189 | - s->total_time; | |
2c52ddf1 JQ |
190 | info->has_expected_downtime = true; |
191 | info->expected_downtime = s->expected_downtime; | |
17549e84 | 192 | |
791e7c82 LC |
193 | info->has_ram = true; |
194 | info->ram = g_malloc0(sizeof(*info->ram)); | |
195 | info->ram->transferred = ram_bytes_transferred(); | |
196 | info->ram->remaining = ram_bytes_remaining(); | |
197 | info->ram->total = ram_bytes_total(); | |
004d4c10 OW |
198 | info->ram->duplicate = dup_mig_pages_transferred(); |
199 | info->ram->normal = norm_mig_pages_transferred(); | |
200 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
8d017193 JQ |
201 | info->ram->dirty_pages_rate = s->dirty_pages_rate; |
202 | ||
17549e84 JQ |
203 | |
204 | if (blk_mig_active()) { | |
791e7c82 LC |
205 | info->has_disk = true; |
206 | info->disk = g_malloc0(sizeof(*info->disk)); | |
207 | info->disk->transferred = blk_mig_bytes_transferred(); | |
208 | info->disk->remaining = blk_mig_bytes_remaining(); | |
209 | info->disk->total = blk_mig_bytes_total(); | |
ff8d81d8 | 210 | } |
f36d55af OW |
211 | |
212 | get_xbzrle_cache_stats(info); | |
17549e84 JQ |
213 | break; |
214 | case MIG_STATE_COMPLETED: | |
f36d55af OW |
215 | get_xbzrle_cache_stats(info); |
216 | ||
791e7c82 LC |
217 | info->has_status = true; |
218 | info->status = g_strdup("completed"); | |
7aa939af | 219 | info->total_time = s->total_time; |
9c5a9fcf JQ |
220 | info->has_downtime = true; |
221 | info->downtime = s->downtime; | |
d5f8a570 JQ |
222 | |
223 | info->has_ram = true; | |
224 | info->ram = g_malloc0(sizeof(*info->ram)); | |
225 | info->ram->transferred = ram_bytes_transferred(); | |
226 | info->ram->remaining = 0; | |
227 | info->ram->total = ram_bytes_total(); | |
004d4c10 OW |
228 | info->ram->duplicate = dup_mig_pages_transferred(); |
229 | info->ram->normal = norm_mig_pages_transferred(); | |
230 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
17549e84 JQ |
231 | break; |
232 | case MIG_STATE_ERROR: | |
791e7c82 LC |
233 | info->has_status = true; |
234 | info->status = g_strdup("failed"); | |
17549e84 JQ |
235 | break; |
236 | case MIG_STATE_CANCELLED: | |
791e7c82 LC |
237 | info->has_status = true; |
238 | info->status = g_strdup("cancelled"); | |
17549e84 | 239 | break; |
5bb7910a | 240 | } |
791e7c82 LC |
241 | |
242 | return info; | |
5bb7910a AL |
243 | } |
244 | ||
00458433 OW |
245 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, |
246 | Error **errp) | |
247 | { | |
248 | MigrationState *s = migrate_get_current(); | |
249 | MigrationCapabilityStatusList *cap; | |
250 | ||
251 | if (s->state == MIG_STATE_ACTIVE) { | |
252 | error_set(errp, QERR_MIGRATION_ACTIVE); | |
253 | return; | |
254 | } | |
255 | ||
256 | for (cap = params; cap; cap = cap->next) { | |
257 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
258 | } | |
259 | } | |
260 | ||
065e2813 AL |
261 | /* shared migration helpers */ |
262 | ||
7a2c1721 | 263 | static void migrate_fd_cleanup(MigrationState *s) |
065e2813 | 264 | { |
41ef56e6 AL |
265 | int ret = 0; |
266 | ||
065e2813 | 267 | if (s->file) { |
d0f2c4c6 | 268 | DPRINTF("closing file\n"); |
a6d34a94 | 269 | ret = qemu_fclose(s->file); |
5d39c799 | 270 | s->file = NULL; |
065e2813 AL |
271 | } |
272 | ||
24ea1e4b | 273 | assert(s->fd == -1); |
7a2c1721 PB |
274 | if (ret < 0 && s->state == MIG_STATE_ACTIVE) { |
275 | s->state = MIG_STATE_ERROR; | |
276 | } | |
277 | ||
278 | if (s->state != MIG_STATE_ACTIVE) { | |
279 | qemu_savevm_state_cancel(); | |
280 | } | |
065e2813 AL |
281 | } |
282 | ||
8b6b99b3 | 283 | void migrate_fd_error(MigrationState *s) |
065e2813 | 284 | { |
8b6b99b3 JQ |
285 | DPRINTF("setting error state\n"); |
286 | s->state = MIG_STATE_ERROR; | |
e0eb7390 | 287 | notifier_list_notify(&migration_state_notifiers, s); |
8b6b99b3 JQ |
288 | migrate_fd_cleanup(s); |
289 | } | |
290 | ||
458cf28e JQ |
291 | static void migrate_fd_completed(MigrationState *s) |
292 | { | |
293 | DPRINTF("setting completed state\n"); | |
7a2c1721 PB |
294 | migrate_fd_cleanup(s); |
295 | if (s->state == MIG_STATE_ACTIVE) { | |
458cf28e JQ |
296 | s->state = MIG_STATE_COMPLETED; |
297 | runstate_set(RUN_STATE_POSTMIGRATE); | |
298 | } | |
e0eb7390 | 299 | notifier_list_notify(&migration_state_notifiers, s); |
458cf28e JQ |
300 | } |
301 | ||
b9c961a8 PB |
302 | static ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data, |
303 | size_t size) | |
065e2813 | 304 | { |
065e2813 AL |
305 | ssize_t ret; |
306 | ||
fdbecb5d JQ |
307 | if (s->state != MIG_STATE_ACTIVE) { |
308 | return -EIO; | |
309 | } | |
310 | ||
065e2813 AL |
311 | do { |
312 | ret = s->write(s, data, size); | |
95b134ea | 313 | } while (ret == -1 && ((s->get_error(s)) == EINTR)); |
065e2813 AL |
314 | |
315 | if (ret == -1) | |
316 | ret = -(s->get_error(s)); | |
317 | ||
065e2813 AL |
318 | return ret; |
319 | } | |
320 | ||
0edda1c4 | 321 | static void migrate_fd_cancel(MigrationState *s) |
065e2813 | 322 | { |
065e2813 AL |
323 | if (s->state != MIG_STATE_ACTIVE) |
324 | return; | |
325 | ||
d0f2c4c6 | 326 | DPRINTF("cancelling migration\n"); |
065e2813 AL |
327 | |
328 | s->state = MIG_STATE_CANCELLED; | |
e0eb7390 | 329 | notifier_list_notify(&migration_state_notifiers, s); |
065e2813 AL |
330 | |
331 | migrate_fd_cleanup(s); | |
332 | } | |
333 | ||
11c76741 | 334 | int migrate_fd_close(MigrationState *s) |
065e2813 | 335 | { |
8dc592e6 PB |
336 | int rc = 0; |
337 | if (s->fd != -1) { | |
8dc592e6 PB |
338 | rc = s->close(s); |
339 | s->fd = -1; | |
340 | } | |
341 | return rc; | |
065e2813 | 342 | } |
99a0db9b GH |
343 | |
344 | void add_migration_state_change_notifier(Notifier *notify) | |
345 | { | |
346 | notifier_list_add(&migration_state_notifiers, notify); | |
347 | } | |
348 | ||
349 | void remove_migration_state_change_notifier(Notifier *notify) | |
350 | { | |
31552529 | 351 | notifier_remove(notify); |
99a0db9b GH |
352 | } |
353 | ||
afe2df69 GH |
354 | bool migration_is_active(MigrationState *s) |
355 | { | |
356 | return s->state == MIG_STATE_ACTIVE; | |
357 | } | |
358 | ||
7073693b | 359 | bool migration_has_finished(MigrationState *s) |
99a0db9b | 360 | { |
7073693b | 361 | return s->state == MIG_STATE_COMPLETED; |
99a0db9b | 362 | } |
0edda1c4 | 363 | |
afe2df69 GH |
364 | bool migration_has_failed(MigrationState *s) |
365 | { | |
366 | return (s->state == MIG_STATE_CANCELLED || | |
367 | s->state == MIG_STATE_ERROR); | |
368 | } | |
369 | ||
6607ae23 | 370 | static MigrationState *migrate_init(const MigrationParams *params) |
0edda1c4 | 371 | { |
17549e84 | 372 | MigrationState *s = migrate_get_current(); |
d0ae46c1 | 373 | int64_t bandwidth_limit = s->bandwidth_limit; |
bbf6da32 | 374 | bool enabled_capabilities[MIGRATION_CAPABILITY_MAX]; |
17ad9b35 | 375 | int64_t xbzrle_cache_size = s->xbzrle_cache_size; |
bbf6da32 OW |
376 | |
377 | memcpy(enabled_capabilities, s->enabled_capabilities, | |
378 | sizeof(enabled_capabilities)); | |
0edda1c4 | 379 | |
17549e84 | 380 | memset(s, 0, sizeof(*s)); |
d0ae46c1 | 381 | s->bandwidth_limit = bandwidth_limit; |
6607ae23 | 382 | s->params = *params; |
bbf6da32 OW |
383 | memcpy(s->enabled_capabilities, enabled_capabilities, |
384 | sizeof(enabled_capabilities)); | |
17ad9b35 | 385 | s->xbzrle_cache_size = xbzrle_cache_size; |
1299c631 | 386 | |
0edda1c4 | 387 | s->bandwidth_limit = bandwidth_limit; |
d5934dde | 388 | s->state = MIG_STATE_SETUP; |
d5f8a570 | 389 | s->total_time = qemu_get_clock_ms(rt_clock); |
0edda1c4 | 390 | |
0edda1c4 JQ |
391 | return s; |
392 | } | |
cab30143 | 393 | |
fa2756b7 AL |
394 | static GSList *migration_blockers; |
395 | ||
396 | void migrate_add_blocker(Error *reason) | |
397 | { | |
398 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
399 | } | |
400 | ||
401 | void migrate_del_blocker(Error *reason) | |
402 | { | |
403 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
404 | } | |
405 | ||
e1c37d0e LC |
406 | void qmp_migrate(const char *uri, bool has_blk, bool blk, |
407 | bool has_inc, bool inc, bool has_detach, bool detach, | |
408 | Error **errp) | |
cab30143 | 409 | { |
be7059cd | 410 | Error *local_err = NULL; |
17549e84 | 411 | MigrationState *s = migrate_get_current(); |
6607ae23 | 412 | MigrationParams params; |
cab30143 | 413 | const char *p; |
cab30143 | 414 | |
6607ae23 IY |
415 | params.blk = blk; |
416 | params.shared = inc; | |
417 | ||
17549e84 | 418 | if (s->state == MIG_STATE_ACTIVE) { |
e1c37d0e LC |
419 | error_set(errp, QERR_MIGRATION_ACTIVE); |
420 | return; | |
cab30143 JQ |
421 | } |
422 | ||
e1c37d0e LC |
423 | if (qemu_savevm_state_blocked(errp)) { |
424 | return; | |
cab30143 JQ |
425 | } |
426 | ||
fa2756b7 | 427 | if (migration_blockers) { |
e1c37d0e LC |
428 | *errp = error_copy(migration_blockers->data); |
429 | return; | |
fa2756b7 AL |
430 | } |
431 | ||
6607ae23 | 432 | s = migrate_init(¶ms); |
cab30143 JQ |
433 | |
434 | if (strstart(uri, "tcp:", &p)) { | |
f37afb5a | 435 | tcp_start_outgoing_migration(s, p, &local_err); |
cab30143 JQ |
436 | #if !defined(WIN32) |
437 | } else if (strstart(uri, "exec:", &p)) { | |
f37afb5a | 438 | exec_start_outgoing_migration(s, p, &local_err); |
cab30143 | 439 | } else if (strstart(uri, "unix:", &p)) { |
f37afb5a | 440 | unix_start_outgoing_migration(s, p, &local_err); |
cab30143 | 441 | } else if (strstart(uri, "fd:", &p)) { |
f37afb5a | 442 | fd_start_outgoing_migration(s, p, &local_err); |
cab30143 | 443 | #endif |
99a0db9b | 444 | } else { |
e1c37d0e LC |
445 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol"); |
446 | return; | |
cab30143 JQ |
447 | } |
448 | ||
f37afb5a | 449 | if (local_err) { |
342ab8d1 | 450 | migrate_fd_error(s); |
f37afb5a | 451 | error_propagate(errp, local_err); |
e1c37d0e | 452 | return; |
1299c631 | 453 | } |
cab30143 JQ |
454 | } |
455 | ||
6cdedb07 | 456 | void qmp_migrate_cancel(Error **errp) |
cab30143 | 457 | { |
17549e84 | 458 | migrate_fd_cancel(migrate_get_current()); |
cab30143 JQ |
459 | } |
460 | ||
9e1ba4cc OW |
461 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) |
462 | { | |
463 | MigrationState *s = migrate_get_current(); | |
464 | ||
465 | /* Check for truncation */ | |
466 | if (value != (size_t)value) { | |
467 | error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", | |
468 | "exceeding address space"); | |
469 | return; | |
470 | } | |
471 | ||
472 | s->xbzrle_cache_size = xbzrle_cache_resize(value); | |
473 | } | |
474 | ||
475 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
476 | { | |
477 | return migrate_xbzrle_cache_size(); | |
478 | } | |
479 | ||
3dc85383 | 480 | void qmp_migrate_set_speed(int64_t value, Error **errp) |
cab30143 | 481 | { |
cab30143 JQ |
482 | MigrationState *s; |
483 | ||
3dc85383 LC |
484 | if (value < 0) { |
485 | value = 0; | |
99a0db9b | 486 | } |
cab30143 | 487 | |
17549e84 | 488 | s = migrate_get_current(); |
3dc85383 | 489 | s->bandwidth_limit = value; |
d0ae46c1 | 490 | qemu_file_set_rate_limit(s->file, s->bandwidth_limit); |
cab30143 JQ |
491 | } |
492 | ||
4f0a993b | 493 | void qmp_migrate_set_downtime(double value, Error **errp) |
cab30143 | 494 | { |
4f0a993b LC |
495 | value *= 1e9; |
496 | value = MAX(0, MIN(UINT64_MAX, value)); | |
497 | max_downtime = (uint64_t)value; | |
99a0db9b | 498 | } |
17ad9b35 OW |
499 | |
500 | int migrate_use_xbzrle(void) | |
501 | { | |
502 | MigrationState *s; | |
503 | ||
504 | s = migrate_get_current(); | |
505 | ||
506 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
507 | } | |
508 | ||
509 | int64_t migrate_xbzrle_cache_size(void) | |
510 | { | |
511 | MigrationState *s; | |
512 | ||
513 | s = migrate_get_current(); | |
514 | ||
515 | return s->xbzrle_cache_size; | |
516 | } | |
0d82d0e8 JQ |
517 | |
518 | /* migration thread support */ | |
519 | ||
9848a404 | 520 | |
63dfbd7e | 521 | static void buffered_flush(MigrationState *s) |
0d82d0e8 JQ |
522 | { |
523 | size_t offset = 0; | |
524 | ssize_t ret = 0; | |
525 | ||
526 | DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size); | |
527 | ||
dba433c0 PB |
528 | if (qemu_file_get_error(s->file)) { |
529 | s->buffer_size = 0; | |
530 | return; | |
531 | } | |
f5821518 PB |
532 | qemu_fflush(s->file); |
533 | ||
0d82d0e8 JQ |
534 | while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) { |
535 | size_t to_send = MIN(s->buffer_size - offset, s->xfer_limit - s->bytes_xfer); | |
9848a404 | 536 | ret = migrate_fd_put_buffer(s, s->buffer + offset, to_send); |
0d82d0e8 JQ |
537 | if (ret <= 0) { |
538 | DPRINTF("error flushing data, %zd\n", ret); | |
539 | break; | |
540 | } else { | |
541 | DPRINTF("flushed %zd byte(s)\n", ret); | |
542 | offset += ret; | |
543 | s->bytes_xfer += ret; | |
544 | } | |
545 | } | |
546 | ||
547 | DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size); | |
548 | memmove(s->buffer, s->buffer + offset, s->buffer_size - offset); | |
549 | s->buffer_size -= offset; | |
550 | ||
551 | if (ret < 0) { | |
63dfbd7e | 552 | qemu_file_set_error(s->file, ret); |
0d82d0e8 | 553 | } |
0d82d0e8 JQ |
554 | } |
555 | ||
556 | static int buffered_put_buffer(void *opaque, const uint8_t *buf, | |
557 | int64_t pos, int size) | |
558 | { | |
9848a404 | 559 | MigrationState *s = opaque; |
0d82d0e8 JQ |
560 | ssize_t error; |
561 | ||
562 | DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos); | |
563 | ||
564 | error = qemu_file_get_error(s->file); | |
565 | if (error) { | |
566 | DPRINTF("flush when error, bailing: %s\n", strerror(-error)); | |
567 | return error; | |
568 | } | |
569 | ||
570 | if (size <= 0) { | |
571 | return size; | |
572 | } | |
573 | ||
574 | if (size > (s->buffer_capacity - s->buffer_size)) { | |
575 | DPRINTF("increasing buffer capacity from %zu by %zu\n", | |
576 | s->buffer_capacity, size + 1024); | |
577 | ||
578 | s->buffer_capacity += size + 1024; | |
579 | ||
580 | s->buffer = g_realloc(s->buffer, s->buffer_capacity); | |
581 | } | |
582 | ||
583 | memcpy(s->buffer + s->buffer_size, buf, size); | |
584 | s->buffer_size += size; | |
585 | ||
586 | return size; | |
587 | } | |
588 | ||
589 | static int buffered_close(void *opaque) | |
590 | { | |
9848a404 | 591 | MigrationState *s = opaque; |
0d82d0e8 JQ |
592 | |
593 | DPRINTF("closing\n"); | |
594 | ||
595 | s->xfer_limit = INT_MAX; | |
596 | while (!qemu_file_get_error(s->file) && s->buffer_size) { | |
63dfbd7e | 597 | buffered_flush(s); |
0d82d0e8 | 598 | } |
63dfbd7e | 599 | return migrate_fd_close(s); |
0d82d0e8 JQ |
600 | } |
601 | ||
602 | static int buffered_get_fd(void *opaque) | |
603 | { | |
9848a404 | 604 | MigrationState *s = opaque; |
0d82d0e8 | 605 | |
9848a404 | 606 | return s->fd; |
0d82d0e8 JQ |
607 | } |
608 | ||
609 | /* | |
610 | * The meaning of the return values is: | |
611 | * 0: We can continue sending | |
612 | * 1: Time to stop | |
613 | * negative: There has been an error | |
614 | */ | |
615 | static int buffered_rate_limit(void *opaque) | |
616 | { | |
9848a404 | 617 | MigrationState *s = opaque; |
0d82d0e8 JQ |
618 | int ret; |
619 | ||
620 | ret = qemu_file_get_error(s->file); | |
621 | if (ret) { | |
622 | return ret; | |
623 | } | |
624 | ||
1e973051 | 625 | if (s->bytes_xfer >= s->xfer_limit) { |
0d82d0e8 JQ |
626 | return 1; |
627 | } | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
632 | static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate) | |
633 | { | |
9848a404 | 634 | MigrationState *s = opaque; |
0d82d0e8 JQ |
635 | if (qemu_file_get_error(s->file)) { |
636 | goto out; | |
637 | } | |
638 | if (new_rate > SIZE_MAX) { | |
639 | new_rate = SIZE_MAX; | |
640 | } | |
641 | ||
f65a8747 | 642 | s->xfer_limit = new_rate / XFER_LIMIT_RATIO; |
0d82d0e8 JQ |
643 | |
644 | out: | |
645 | return s->xfer_limit; | |
646 | } | |
647 | ||
648 | static int64_t buffered_get_rate_limit(void *opaque) | |
649 | { | |
9848a404 | 650 | MigrationState *s = opaque; |
0d82d0e8 JQ |
651 | |
652 | return s->xfer_limit; | |
653 | } | |
654 | ||
0d82d0e8 JQ |
655 | static void *buffered_file_thread(void *opaque) |
656 | { | |
9848a404 | 657 | MigrationState *s = opaque; |
0d82d0e8 | 658 | int64_t initial_time = qemu_get_clock_ms(rt_clock); |
7161082c | 659 | int64_t sleep_time = 0; |
0d82d0e8 JQ |
660 | int64_t max_size = 0; |
661 | bool last_round = false; | |
76f5933a JQ |
662 | |
663 | qemu_mutex_lock_iothread(); | |
664 | DPRINTF("beginning savevm\n"); | |
dba433c0 | 665 | qemu_savevm_state_begin(s->file, &s->params); |
0d82d0e8 | 666 | |
dba433c0 | 667 | while (s->state == MIG_STATE_ACTIVE) { |
a3e879cd | 668 | int64_t current_time; |
c369f40d | 669 | uint64_t pending_size; |
0d82d0e8 | 670 | |
c369f40d JQ |
671 | if (s->bytes_xfer < s->xfer_limit) { |
672 | DPRINTF("iterate\n"); | |
673 | pending_size = qemu_savevm_state_pending(s->file, max_size); | |
674 | DPRINTF("pending size %lu max %lu\n", pending_size, max_size); | |
b22ff1fb | 675 | if (pending_size && pending_size >= max_size) { |
dba433c0 | 676 | qemu_savevm_state_iterate(s->file); |
c369f40d JQ |
677 | } else { |
678 | int old_vm_running = runstate_is_running(); | |
679 | int64_t start_time, end_time; | |
680 | ||
681 | DPRINTF("done iterating\n"); | |
682 | start_time = qemu_get_clock_ms(rt_clock); | |
683 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
891518ab | 684 | vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); |
dba433c0 PB |
685 | qemu_savevm_state_complete(s->file); |
686 | migrate_fd_completed(s); | |
c369f40d JQ |
687 | end_time = qemu_get_clock_ms(rt_clock); |
688 | s->total_time = end_time - s->total_time; | |
689 | s->downtime = end_time - start_time; | |
690 | if (s->state != MIG_STATE_COMPLETED) { | |
691 | if (old_vm_running) { | |
692 | vm_start(); | |
693 | } | |
694 | } | |
695 | last_round = true; | |
696 | } | |
697 | } | |
7de6a690 | 698 | qemu_mutex_unlock_iothread(); |
a3e879cd | 699 | current_time = qemu_get_clock_ms(rt_clock); |
0d82d0e8 JQ |
700 | if (current_time >= initial_time + BUFFER_DELAY) { |
701 | uint64_t transferred_bytes = s->bytes_xfer; | |
7161082c | 702 | uint64_t time_spent = current_time - initial_time - sleep_time; |
0d82d0e8 JQ |
703 | double bandwidth = transferred_bytes / time_spent; |
704 | max_size = bandwidth * migrate_max_downtime() / 1000000; | |
705 | ||
706 | DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64 | |
707 | " bandwidth %g max_size %" PRId64 "\n", | |
708 | transferred_bytes, time_spent, bandwidth, max_size); | |
90f8ae72 JQ |
709 | /* if we haven't sent anything, we don't want to recalculate |
710 | 10000 is a small enough number for our purposes */ | |
711 | if (s->dirty_bytes_rate && transferred_bytes > 10000) { | |
712 | s->expected_downtime = s->dirty_bytes_rate / bandwidth; | |
713 | } | |
0d82d0e8 JQ |
714 | |
715 | s->bytes_xfer = 0; | |
7161082c | 716 | sleep_time = 0; |
0d82d0e8 JQ |
717 | initial_time = current_time; |
718 | } | |
719 | if (!last_round && (s->bytes_xfer >= s->xfer_limit)) { | |
720 | /* usleep expects microseconds */ | |
721 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
7161082c | 722 | sleep_time += qemu_get_clock_ms(rt_clock) - current_time; |
0d82d0e8 | 723 | } |
63dfbd7e | 724 | buffered_flush(s); |
dba433c0 PB |
725 | qemu_mutex_lock_iothread(); |
726 | if (qemu_file_get_error(s->file)) { | |
727 | migrate_fd_error(s); | |
728 | } | |
0d82d0e8 JQ |
729 | } |
730 | ||
dba433c0 | 731 | qemu_mutex_unlock_iothread(); |
0d82d0e8 | 732 | g_free(s->buffer); |
0d82d0e8 JQ |
733 | return NULL; |
734 | } | |
735 | ||
736 | static const QEMUFileOps buffered_file_ops = { | |
737 | .get_fd = buffered_get_fd, | |
738 | .put_buffer = buffered_put_buffer, | |
739 | .close = buffered_close, | |
740 | .rate_limit = buffered_rate_limit, | |
741 | .get_rate_limit = buffered_get_rate_limit, | |
742 | .set_rate_limit = buffered_set_rate_limit, | |
743 | }; | |
744 | ||
9848a404 | 745 | void migrate_fd_connect(MigrationState *s) |
0d82d0e8 | 746 | { |
9848a404 JQ |
747 | s->state = MIG_STATE_ACTIVE; |
748 | s->bytes_xfer = 0; | |
749 | s->buffer = NULL; | |
750 | s->buffer_size = 0; | |
751 | s->buffer_capacity = 0; | |
cc283e3b JQ |
752 | /* This is a best 1st approximation. ns to ms */ |
753 | s->expected_downtime = max_downtime/1000000; | |
0d82d0e8 | 754 | |
9848a404 | 755 | s->xfer_limit = s->bandwidth_limit / XFER_LIMIT_RATIO; |
0d82d0e8 JQ |
756 | |
757 | s->file = qemu_fopen_ops(s, &buffered_file_ops); | |
758 | ||
0d82d0e8 JQ |
759 | qemu_thread_create(&s->thread, buffered_file_thread, s, |
760 | QEMU_THREAD_DETACHED); | |
0d3b26f5 | 761 | notifier_list_notify(&migration_state_notifiers, s); |
0d82d0e8 | 762 | } |