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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 | ||
1393a485 | 16 | #include "qemu/osdep.h" |
f348b6d1 | 17 | #include "qemu/cutils.h" |
d49b6836 | 18 | #include "qemu/error-report.h" |
6a1751b7 | 19 | #include "qemu/main-loop.h" |
caf71f86 | 20 | #include "migration/migration.h" |
0d82d0e8 | 21 | #include "migration/qemu-file.h" |
9c17d615 | 22 | #include "sysemu/sysemu.h" |
737e150e | 23 | #include "block/block.h" |
cc7a8ea7 | 24 | #include "qapi/qmp/qerror.h" |
6c595cde | 25 | #include "qapi/util.h" |
1de7afc9 | 26 | #include "qemu/sockets.h" |
ab28bd23 | 27 | #include "qemu/rcu.h" |
caf71f86 | 28 | #include "migration/block.h" |
e0b266f0 | 29 | #include "migration/postcopy-ram.h" |
766bd176 | 30 | #include "qemu/thread.h" |
791e7c82 | 31 | #include "qmp-commands.h" |
c09e5bb1 | 32 | #include "trace.h" |
598cd2bd | 33 | #include "qapi-event.h" |
070afca2 | 34 | #include "qom/cpu.h" |
6c595cde DDAG |
35 | #include "exec/memory.h" |
36 | #include "exec/address-spaces.h" | |
065e2813 | 37 | |
dc325627 | 38 | #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ |
5bb7910a | 39 | |
5b4e1eb7 JQ |
40 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled |
41 | * data. */ | |
42 | #define BUFFER_DELAY 100 | |
43 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
44 | ||
8706d2d5 LL |
45 | /* Default compression thread count */ |
46 | #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 | |
3fcb38c2 LL |
47 | /* Default decompression thread count, usually decompression is at |
48 | * least 4 times as fast as compression.*/ | |
49 | #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 | |
8706d2d5 LL |
50 | /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ |
51 | #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 | |
1626fee3 | 52 | /* Define default autoconverge cpu throttle migration parameters */ |
d85a31d1 JH |
53 | #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20 |
54 | #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10 | |
8706d2d5 | 55 | |
17ad9b35 OW |
56 | /* Migration XBZRLE default cache size */ |
57 | #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) | |
58 | ||
99a0db9b GH |
59 | static NotifierList migration_state_notifiers = |
60 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
61 | ||
adde220a DDAG |
62 | static bool deferred_incoming; |
63 | ||
093e3c42 DDAG |
64 | /* |
65 | * Current state of incoming postcopy; note this is not part of | |
66 | * MigrationIncomingState since it's state is used during cleanup | |
67 | * at the end as MIS is being freed. | |
68 | */ | |
69 | static PostcopyState incoming_postcopy_state; | |
70 | ||
17549e84 JQ |
71 | /* When we add fault tolerance, we could have several |
72 | migrations at once. For now we don't need to add | |
73 | dynamic creation of migration */ | |
74 | ||
bca7856a | 75 | /* For outgoing */ |
859bc756 | 76 | MigrationState *migrate_get_current(void) |
17549e84 | 77 | { |
6c595cde | 78 | static bool once; |
17549e84 | 79 | static MigrationState current_migration = { |
31194731 | 80 | .state = MIGRATION_STATUS_NONE, |
d0ae46c1 | 81 | .bandwidth_limit = MAX_THROTTLE, |
17ad9b35 | 82 | .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, |
7e114f8c | 83 | .mbps = -1, |
43c60a81 LL |
84 | .parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = |
85 | DEFAULT_MIGRATE_COMPRESS_LEVEL, | |
86 | .parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = | |
87 | DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT, | |
88 | .parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] = | |
89 | DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT, | |
d85a31d1 JH |
90 | .parameters[MIGRATION_PARAMETER_CPU_THROTTLE_INITIAL] = |
91 | DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL, | |
92 | .parameters[MIGRATION_PARAMETER_CPU_THROTTLE_INCREMENT] = | |
93 | DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT, | |
17549e84 JQ |
94 | }; |
95 | ||
6c595cde DDAG |
96 | if (!once) { |
97 | qemu_mutex_init(¤t_migration.src_page_req_mutex); | |
98 | once = true; | |
99 | } | |
17549e84 JQ |
100 | return ¤t_migration; |
101 | } | |
102 | ||
bca7856a DDAG |
103 | /* For incoming */ |
104 | static MigrationIncomingState *mis_current; | |
105 | ||
106 | MigrationIncomingState *migration_incoming_get_current(void) | |
107 | { | |
108 | return mis_current; | |
109 | } | |
110 | ||
111 | MigrationIncomingState *migration_incoming_state_new(QEMUFile* f) | |
112 | { | |
97f3ad35 | 113 | mis_current = g_new0(MigrationIncomingState, 1); |
42e2aa56 | 114 | mis_current->from_src_file = f; |
93d7af6f | 115 | mis_current->state = MIGRATION_STATUS_NONE; |
1a8f46f8 | 116 | QLIST_INIT(&mis_current->loadvm_handlers); |
6decec93 | 117 | qemu_mutex_init(&mis_current->rp_mutex); |
7b89bf27 | 118 | qemu_event_init(&mis_current->main_thread_load_event, false); |
bca7856a DDAG |
119 | |
120 | return mis_current; | |
121 | } | |
122 | ||
123 | void migration_incoming_state_destroy(void) | |
124 | { | |
7b89bf27 | 125 | qemu_event_destroy(&mis_current->main_thread_load_event); |
1a8f46f8 | 126 | loadvm_free_handlers(mis_current); |
bca7856a DDAG |
127 | g_free(mis_current); |
128 | mis_current = NULL; | |
129 | } | |
130 | ||
df4b1024 JQ |
131 | |
132 | typedef struct { | |
13d16814 | 133 | bool optional; |
df4b1024 JQ |
134 | uint32_t size; |
135 | uint8_t runstate[100]; | |
172c4356 JQ |
136 | RunState state; |
137 | bool received; | |
df4b1024 JQ |
138 | } GlobalState; |
139 | ||
140 | static GlobalState global_state; | |
141 | ||
560d027b | 142 | int global_state_store(void) |
df4b1024 JQ |
143 | { |
144 | if (!runstate_store((char *)global_state.runstate, | |
145 | sizeof(global_state.runstate))) { | |
146 | error_report("runstate name too big: %s", global_state.runstate); | |
147 | trace_migrate_state_too_big(); | |
148 | return -EINVAL; | |
149 | } | |
150 | return 0; | |
151 | } | |
152 | ||
c69adea4 AP |
153 | void global_state_store_running(void) |
154 | { | |
155 | const char *state = RunState_lookup[RUN_STATE_RUNNING]; | |
156 | strncpy((char *)global_state.runstate, | |
157 | state, sizeof(global_state.runstate)); | |
158 | } | |
159 | ||
172c4356 | 160 | static bool global_state_received(void) |
df4b1024 | 161 | { |
172c4356 JQ |
162 | return global_state.received; |
163 | } | |
164 | ||
165 | static RunState global_state_get_runstate(void) | |
166 | { | |
167 | return global_state.state; | |
df4b1024 JQ |
168 | } |
169 | ||
13d16814 JQ |
170 | void global_state_set_optional(void) |
171 | { | |
172 | global_state.optional = true; | |
173 | } | |
174 | ||
175 | static bool global_state_needed(void *opaque) | |
176 | { | |
177 | GlobalState *s = opaque; | |
178 | char *runstate = (char *)s->runstate; | |
179 | ||
180 | /* If it is not optional, it is mandatory */ | |
181 | ||
182 | if (s->optional == false) { | |
183 | return true; | |
184 | } | |
185 | ||
186 | /* If state is running or paused, it is not needed */ | |
187 | ||
188 | if (strcmp(runstate, "running") == 0 || | |
189 | strcmp(runstate, "paused") == 0) { | |
190 | return false; | |
191 | } | |
192 | ||
193 | /* for any other state it is needed */ | |
194 | return true; | |
195 | } | |
196 | ||
df4b1024 JQ |
197 | static int global_state_post_load(void *opaque, int version_id) |
198 | { | |
199 | GlobalState *s = opaque; | |
172c4356 JQ |
200 | Error *local_err = NULL; |
201 | int r; | |
df4b1024 JQ |
202 | char *runstate = (char *)s->runstate; |
203 | ||
172c4356 | 204 | s->received = true; |
df4b1024 JQ |
205 | trace_migrate_global_state_post_load(runstate); |
206 | ||
7fb1cf16 | 207 | r = qapi_enum_parse(RunState_lookup, runstate, RUN_STATE__MAX, |
df4b1024 JQ |
208 | -1, &local_err); |
209 | ||
172c4356 JQ |
210 | if (r == -1) { |
211 | if (local_err) { | |
212 | error_report_err(local_err); | |
df4b1024 | 213 | } |
172c4356 | 214 | return -EINVAL; |
df4b1024 | 215 | } |
172c4356 | 216 | s->state = r; |
df4b1024 | 217 | |
172c4356 | 218 | return 0; |
df4b1024 JQ |
219 | } |
220 | ||
221 | static void global_state_pre_save(void *opaque) | |
222 | { | |
223 | GlobalState *s = opaque; | |
224 | ||
225 | trace_migrate_global_state_pre_save((char *)s->runstate); | |
226 | s->size = strlen((char *)s->runstate) + 1; | |
227 | } | |
228 | ||
229 | static const VMStateDescription vmstate_globalstate = { | |
230 | .name = "globalstate", | |
231 | .version_id = 1, | |
232 | .minimum_version_id = 1, | |
233 | .post_load = global_state_post_load, | |
234 | .pre_save = global_state_pre_save, | |
13d16814 | 235 | .needed = global_state_needed, |
df4b1024 JQ |
236 | .fields = (VMStateField[]) { |
237 | VMSTATE_UINT32(size, GlobalState), | |
238 | VMSTATE_BUFFER(runstate, GlobalState), | |
239 | VMSTATE_END_OF_LIST() | |
240 | }, | |
241 | }; | |
242 | ||
243 | void register_global_state(void) | |
244 | { | |
245 | /* We would use it independently that we receive it */ | |
246 | strcpy((char *)&global_state.runstate, ""); | |
172c4356 | 247 | global_state.received = false; |
df4b1024 JQ |
248 | vmstate_register(NULL, 0, &vmstate_globalstate, &global_state); |
249 | } | |
250 | ||
b05dc723 JQ |
251 | static void migrate_generate_event(int new_state) |
252 | { | |
253 | if (migrate_use_events()) { | |
254 | qapi_event_send_migration(new_state, &error_abort); | |
b05dc723 JQ |
255 | } |
256 | } | |
257 | ||
adde220a DDAG |
258 | /* |
259 | * Called on -incoming with a defer: uri. | |
260 | * The migration can be started later after any parameters have been | |
261 | * changed. | |
262 | */ | |
263 | static void deferred_incoming_migration(Error **errp) | |
264 | { | |
265 | if (deferred_incoming) { | |
266 | error_setg(errp, "Incoming migration already deferred"); | |
267 | } | |
268 | deferred_incoming = true; | |
269 | } | |
270 | ||
1e2d90eb DDAG |
271 | /* Request a range of pages from the source VM at the given |
272 | * start address. | |
273 | * rbname: Name of the RAMBlock to request the page in, if NULL it's the same | |
274 | * as the last request (a name must have been given previously) | |
275 | * Start: Address offset within the RB | |
276 | * Len: Length in bytes required - must be a multiple of pagesize | |
277 | */ | |
278 | void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname, | |
279 | ram_addr_t start, size_t len) | |
280 | { | |
cb8d4c8f | 281 | uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ |
1e2d90eb DDAG |
282 | size_t msglen = 12; /* start + len */ |
283 | ||
284 | *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); | |
285 | *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); | |
286 | ||
287 | if (rbname) { | |
288 | int rbname_len = strlen(rbname); | |
289 | assert(rbname_len < 256); | |
290 | ||
291 | bufc[msglen++] = rbname_len; | |
292 | memcpy(bufc + msglen, rbname, rbname_len); | |
293 | msglen += rbname_len; | |
294 | migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc); | |
295 | } else { | |
296 | migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc); | |
297 | } | |
298 | } | |
299 | ||
43eaae28 | 300 | void qemu_start_incoming_migration(const char *uri, Error **errp) |
5bb7910a | 301 | { |
34c9dd8e AL |
302 | const char *p; |
303 | ||
7cf1fe6d | 304 | qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort); |
adde220a DDAG |
305 | if (!strcmp(uri, "defer")) { |
306 | deferred_incoming_migration(errp); | |
307 | } else if (strstart(uri, "tcp:", &p)) { | |
43eaae28 | 308 | tcp_start_incoming_migration(p, errp); |
2da776db | 309 | #ifdef CONFIG_RDMA |
adde220a | 310 | } else if (strstart(uri, "rdma:", &p)) { |
2da776db MH |
311 | rdma_start_incoming_migration(p, errp); |
312 | #endif | |
065e2813 | 313 | #if !defined(WIN32) |
adde220a | 314 | } else if (strstart(uri, "exec:", &p)) { |
43eaae28 | 315 | exec_start_incoming_migration(p, errp); |
adde220a | 316 | } else if (strstart(uri, "unix:", &p)) { |
43eaae28 | 317 | unix_start_incoming_migration(p, errp); |
adde220a | 318 | } else if (strstart(uri, "fd:", &p)) { |
43eaae28 | 319 | fd_start_incoming_migration(p, errp); |
065e2813 | 320 | #endif |
adde220a | 321 | } else { |
312fd5f2 | 322 | error_setg(errp, "unknown migration protocol: %s", uri); |
8ca5e801 | 323 | } |
5bb7910a AL |
324 | } |
325 | ||
0aa6aefc DL |
326 | static void process_incoming_migration_bh(void *opaque) |
327 | { | |
328 | Error *local_err = NULL; | |
329 | MigrationIncomingState *mis = opaque; | |
330 | ||
331 | /* Make sure all file formats flush their mutable metadata */ | |
332 | bdrv_invalidate_cache_all(&local_err); | |
333 | if (local_err) { | |
334 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
335 | MIGRATION_STATUS_FAILED); | |
336 | error_report_err(local_err); | |
337 | migrate_decompress_threads_join(); | |
338 | exit(EXIT_FAILURE); | |
339 | } | |
340 | ||
341 | /* | |
342 | * This must happen after all error conditions are dealt with and | |
343 | * we're sure the VM is going to be running on this host. | |
344 | */ | |
345 | qemu_announce_self(); | |
346 | ||
347 | /* If global state section was not received or we are in running | |
348 | state, we need to obey autostart. Any other state is set with | |
349 | runstate_set. */ | |
350 | ||
351 | if (!global_state_received() || | |
352 | global_state_get_runstate() == RUN_STATE_RUNNING) { | |
353 | if (autostart) { | |
354 | vm_start(); | |
355 | } else { | |
356 | runstate_set(RUN_STATE_PAUSED); | |
357 | } | |
358 | } else { | |
359 | runstate_set(global_state_get_runstate()); | |
360 | } | |
361 | migrate_decompress_threads_join(); | |
362 | /* | |
363 | * This must happen after any state changes since as soon as an external | |
364 | * observer sees this event they might start to prod at the VM assuming | |
365 | * it's ready to use. | |
366 | */ | |
367 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
368 | MIGRATION_STATUS_COMPLETED); | |
369 | qemu_bh_delete(mis->bh); | |
370 | migration_incoming_state_destroy(); | |
371 | } | |
372 | ||
82a4da79 | 373 | static void process_incoming_migration_co(void *opaque) |
511c0231 | 374 | { |
82a4da79 | 375 | QEMUFile *f = opaque; |
e9bef235 DDAG |
376 | MigrationIncomingState *mis; |
377 | PostcopyState ps; | |
1c12e1f5 PB |
378 | int ret; |
379 | ||
e9bef235 | 380 | mis = migration_incoming_state_new(f); |
093e3c42 | 381 | postcopy_state_set(POSTCOPY_INCOMING_NONE); |
93d7af6f HZ |
382 | migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, |
383 | MIGRATION_STATUS_ACTIVE); | |
1c12e1f5 | 384 | ret = qemu_loadvm_state(f); |
bca7856a | 385 | |
e9bef235 DDAG |
386 | ps = postcopy_state_get(); |
387 | trace_process_incoming_migration_co_end(ret, ps); | |
388 | if (ps != POSTCOPY_INCOMING_NONE) { | |
389 | if (ps == POSTCOPY_INCOMING_ADVISE) { | |
390 | /* | |
391 | * Where a migration had postcopy enabled (and thus went to advise) | |
392 | * but managed to complete within the precopy period, we can use | |
393 | * the normal exit. | |
394 | */ | |
395 | postcopy_ram_incoming_cleanup(mis); | |
396 | } else if (ret >= 0) { | |
397 | /* | |
398 | * Postcopy was started, cleanup should happen at the end of the | |
399 | * postcopy thread. | |
400 | */ | |
401 | trace_process_incoming_migration_co_postcopy_end_main(); | |
402 | return; | |
403 | } | |
404 | /* Else if something went wrong then just fall out of the normal exit */ | |
405 | } | |
406 | ||
1c12e1f5 | 407 | qemu_fclose(f); |
905f26f2 | 408 | free_xbzrle_decoded_buf(); |
bca7856a | 409 | |
1c12e1f5 | 410 | if (ret < 0) { |
93d7af6f HZ |
411 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, |
412 | MIGRATION_STATUS_FAILED); | |
db80face | 413 | error_report("load of migration failed: %s", strerror(-ret)); |
3fcb38c2 | 414 | migrate_decompress_threads_join(); |
4aead692 | 415 | exit(EXIT_FAILURE); |
511c0231 | 416 | } |
511c0231 | 417 | |
0aa6aefc DL |
418 | mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); |
419 | qemu_bh_schedule(mis->bh); | |
511c0231 JQ |
420 | } |
421 | ||
82a4da79 PB |
422 | void process_incoming_migration(QEMUFile *f) |
423 | { | |
424 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); | |
425 | int fd = qemu_get_fd(f); | |
426 | ||
427 | assert(fd != -1); | |
3fcb38c2 | 428 | migrate_decompress_threads_create(); |
f9e8cacc | 429 | qemu_set_nonblock(fd); |
82a4da79 PB |
430 | qemu_coroutine_enter(co, f); |
431 | } | |
432 | ||
6decec93 DDAG |
433 | /* |
434 | * Send a message on the return channel back to the source | |
435 | * of the migration. | |
436 | */ | |
437 | void migrate_send_rp_message(MigrationIncomingState *mis, | |
438 | enum mig_rp_message_type message_type, | |
439 | uint16_t len, void *data) | |
440 | { | |
441 | trace_migrate_send_rp_message((int)message_type, len); | |
442 | qemu_mutex_lock(&mis->rp_mutex); | |
443 | qemu_put_be16(mis->to_src_file, (unsigned int)message_type); | |
444 | qemu_put_be16(mis->to_src_file, len); | |
445 | qemu_put_buffer(mis->to_src_file, data, len); | |
446 | qemu_fflush(mis->to_src_file); | |
447 | qemu_mutex_unlock(&mis->rp_mutex); | |
448 | } | |
449 | ||
450 | /* | |
451 | * Send a 'SHUT' message on the return channel with the given value | |
452 | * to indicate that we've finished with the RP. Non-0 value indicates | |
453 | * error. | |
454 | */ | |
455 | void migrate_send_rp_shut(MigrationIncomingState *mis, | |
456 | uint32_t value) | |
457 | { | |
458 | uint32_t buf; | |
459 | ||
460 | buf = cpu_to_be32(value); | |
461 | migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); | |
462 | } | |
463 | ||
464 | /* | |
465 | * Send a 'PONG' message on the return channel with the given value | |
466 | * (normally in response to a 'PING') | |
467 | */ | |
468 | void migrate_send_rp_pong(MigrationIncomingState *mis, | |
469 | uint32_t value) | |
470 | { | |
471 | uint32_t buf; | |
472 | ||
473 | buf = cpu_to_be32(value); | |
474 | migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); | |
475 | } | |
476 | ||
a0a3fd60 GC |
477 | /* amount of nanoseconds we are willing to wait for migration to be down. |
478 | * the choice of nanoseconds is because it is the maximum resolution that | |
479 | * get_clock() can achieve. It is an internal measure. All user-visible | |
480 | * units must be in seconds */ | |
f7cd55a0 | 481 | static uint64_t max_downtime = 300000000; |
a0a3fd60 GC |
482 | |
483 | uint64_t migrate_max_downtime(void) | |
484 | { | |
485 | return max_downtime; | |
486 | } | |
487 | ||
bbf6da32 OW |
488 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) |
489 | { | |
490 | MigrationCapabilityStatusList *head = NULL; | |
491 | MigrationCapabilityStatusList *caps; | |
492 | MigrationState *s = migrate_get_current(); | |
493 | int i; | |
494 | ||
387eedeb | 495 | caps = NULL; /* silence compiler warning */ |
7fb1cf16 | 496 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { |
bbf6da32 OW |
497 | if (head == NULL) { |
498 | head = g_malloc0(sizeof(*caps)); | |
499 | caps = head; | |
500 | } else { | |
501 | caps->next = g_malloc0(sizeof(*caps)); | |
502 | caps = caps->next; | |
503 | } | |
504 | caps->value = | |
505 | g_malloc(sizeof(*caps->value)); | |
506 | caps->value->capability = i; | |
507 | caps->value->state = s->enabled_capabilities[i]; | |
508 | } | |
509 | ||
510 | return head; | |
511 | } | |
512 | ||
85de8323 LL |
513 | MigrationParameters *qmp_query_migrate_parameters(Error **errp) |
514 | { | |
515 | MigrationParameters *params; | |
516 | MigrationState *s = migrate_get_current(); | |
517 | ||
518 | params = g_malloc0(sizeof(*params)); | |
519 | params->compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL]; | |
520 | params->compress_threads = | |
521 | s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS]; | |
522 | params->decompress_threads = | |
523 | s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS]; | |
d85a31d1 JH |
524 | params->cpu_throttle_initial = |
525 | s->parameters[MIGRATION_PARAMETER_CPU_THROTTLE_INITIAL]; | |
526 | params->cpu_throttle_increment = | |
527 | s->parameters[MIGRATION_PARAMETER_CPU_THROTTLE_INCREMENT]; | |
85de8323 LL |
528 | |
529 | return params; | |
530 | } | |
531 | ||
f6844b99 DDAG |
532 | /* |
533 | * Return true if we're already in the middle of a migration | |
534 | * (i.e. any of the active or setup states) | |
535 | */ | |
536 | static bool migration_is_setup_or_active(int state) | |
537 | { | |
538 | switch (state) { | |
539 | case MIGRATION_STATUS_ACTIVE: | |
9ec055ae | 540 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
f6844b99 DDAG |
541 | case MIGRATION_STATUS_SETUP: |
542 | return true; | |
543 | ||
544 | default: | |
545 | return false; | |
546 | ||
547 | } | |
548 | } | |
549 | ||
f36d55af OW |
550 | static void get_xbzrle_cache_stats(MigrationInfo *info) |
551 | { | |
552 | if (migrate_use_xbzrle()) { | |
553 | info->has_xbzrle_cache = true; | |
554 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
555 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
556 | info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); | |
557 | info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); | |
558 | info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); | |
8bc39233 | 559 | info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate(); |
f36d55af OW |
560 | info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); |
561 | } | |
562 | } | |
563 | ||
791e7c82 | 564 | MigrationInfo *qmp_query_migrate(Error **errp) |
5bb7910a | 565 | { |
791e7c82 | 566 | MigrationInfo *info = g_malloc0(sizeof(*info)); |
17549e84 JQ |
567 | MigrationState *s = migrate_get_current(); |
568 | ||
569 | switch (s->state) { | |
31194731 | 570 | case MIGRATION_STATUS_NONE: |
17549e84 JQ |
571 | /* no migration has happened ever */ |
572 | break; | |
31194731 | 573 | case MIGRATION_STATUS_SETUP: |
29ae8a41 | 574 | info->has_status = true; |
ed4fbd10 | 575 | info->has_total_time = false; |
29ae8a41 | 576 | break; |
31194731 HZ |
577 | case MIGRATION_STATUS_ACTIVE: |
578 | case MIGRATION_STATUS_CANCELLING: | |
791e7c82 | 579 | info->has_status = true; |
7aa939af | 580 | info->has_total_time = true; |
bc72ad67 | 581 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) |
7aa939af | 582 | - s->total_time; |
2c52ddf1 JQ |
583 | info->has_expected_downtime = true; |
584 | info->expected_downtime = s->expected_downtime; | |
ed4fbd10 MH |
585 | info->has_setup_time = true; |
586 | info->setup_time = s->setup_time; | |
17549e84 | 587 | |
791e7c82 LC |
588 | info->has_ram = true; |
589 | info->ram = g_malloc0(sizeof(*info->ram)); | |
590 | info->ram->transferred = ram_bytes_transferred(); | |
591 | info->ram->remaining = ram_bytes_remaining(); | |
592 | info->ram->total = ram_bytes_total(); | |
004d4c10 | 593 | info->ram->duplicate = dup_mig_pages_transferred(); |
f1c72795 | 594 | info->ram->skipped = skipped_mig_pages_transferred(); |
004d4c10 OW |
595 | info->ram->normal = norm_mig_pages_transferred(); |
596 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
8d017193 | 597 | info->ram->dirty_pages_rate = s->dirty_pages_rate; |
7e114f8c | 598 | info->ram->mbps = s->mbps; |
58570ed8 | 599 | info->ram->dirty_sync_count = s->dirty_sync_count; |
8d017193 | 600 | |
17549e84 | 601 | if (blk_mig_active()) { |
791e7c82 LC |
602 | info->has_disk = true; |
603 | info->disk = g_malloc0(sizeof(*info->disk)); | |
604 | info->disk->transferred = blk_mig_bytes_transferred(); | |
605 | info->disk->remaining = blk_mig_bytes_remaining(); | |
606 | info->disk->total = blk_mig_bytes_total(); | |
ff8d81d8 | 607 | } |
f36d55af | 608 | |
4782893e | 609 | if (cpu_throttle_active()) { |
d85a31d1 JH |
610 | info->has_cpu_throttle_percentage = true; |
611 | info->cpu_throttle_percentage = cpu_throttle_get_percentage(); | |
4782893e JH |
612 | } |
613 | ||
9ec055ae DDAG |
614 | get_xbzrle_cache_stats(info); |
615 | break; | |
616 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
617 | /* Mostly the same as active; TODO add some postcopy stats */ | |
618 | info->has_status = true; | |
619 | info->has_total_time = true; | |
620 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
621 | - s->total_time; | |
622 | info->has_expected_downtime = true; | |
623 | info->expected_downtime = s->expected_downtime; | |
624 | info->has_setup_time = true; | |
625 | info->setup_time = s->setup_time; | |
626 | ||
627 | info->has_ram = true; | |
628 | info->ram = g_malloc0(sizeof(*info->ram)); | |
629 | info->ram->transferred = ram_bytes_transferred(); | |
630 | info->ram->remaining = ram_bytes_remaining(); | |
631 | info->ram->total = ram_bytes_total(); | |
632 | info->ram->duplicate = dup_mig_pages_transferred(); | |
633 | info->ram->skipped = skipped_mig_pages_transferred(); | |
634 | info->ram->normal = norm_mig_pages_transferred(); | |
635 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
636 | info->ram->dirty_pages_rate = s->dirty_pages_rate; | |
637 | info->ram->mbps = s->mbps; | |
614e8018 | 638 | info->ram->dirty_sync_count = s->dirty_sync_count; |
9ec055ae DDAG |
639 | |
640 | if (blk_mig_active()) { | |
641 | info->has_disk = true; | |
642 | info->disk = g_malloc0(sizeof(*info->disk)); | |
643 | info->disk->transferred = blk_mig_bytes_transferred(); | |
644 | info->disk->remaining = blk_mig_bytes_remaining(); | |
645 | info->disk->total = blk_mig_bytes_total(); | |
646 | } | |
647 | ||
f36d55af | 648 | get_xbzrle_cache_stats(info); |
17549e84 | 649 | break; |
31194731 | 650 | case MIGRATION_STATUS_COMPLETED: |
f36d55af OW |
651 | get_xbzrle_cache_stats(info); |
652 | ||
791e7c82 | 653 | info->has_status = true; |
00c14997 | 654 | info->has_total_time = true; |
7aa939af | 655 | info->total_time = s->total_time; |
9c5a9fcf JQ |
656 | info->has_downtime = true; |
657 | info->downtime = s->downtime; | |
ed4fbd10 MH |
658 | info->has_setup_time = true; |
659 | info->setup_time = s->setup_time; | |
d5f8a570 JQ |
660 | |
661 | info->has_ram = true; | |
662 | info->ram = g_malloc0(sizeof(*info->ram)); | |
663 | info->ram->transferred = ram_bytes_transferred(); | |
664 | info->ram->remaining = 0; | |
665 | info->ram->total = ram_bytes_total(); | |
004d4c10 | 666 | info->ram->duplicate = dup_mig_pages_transferred(); |
f1c72795 | 667 | info->ram->skipped = skipped_mig_pages_transferred(); |
004d4c10 OW |
668 | info->ram->normal = norm_mig_pages_transferred(); |
669 | info->ram->normal_bytes = norm_mig_bytes_transferred(); | |
7e114f8c | 670 | info->ram->mbps = s->mbps; |
58570ed8 | 671 | info->ram->dirty_sync_count = s->dirty_sync_count; |
17549e84 | 672 | break; |
31194731 | 673 | case MIGRATION_STATUS_FAILED: |
791e7c82 | 674 | info->has_status = true; |
17549e84 | 675 | break; |
31194731 | 676 | case MIGRATION_STATUS_CANCELLED: |
791e7c82 | 677 | info->has_status = true; |
17549e84 | 678 | break; |
5bb7910a | 679 | } |
cde63fbe | 680 | info->status = s->state; |
791e7c82 LC |
681 | |
682 | return info; | |
5bb7910a AL |
683 | } |
684 | ||
00458433 OW |
685 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, |
686 | Error **errp) | |
687 | { | |
688 | MigrationState *s = migrate_get_current(); | |
689 | MigrationCapabilityStatusList *cap; | |
690 | ||
f6844b99 | 691 | if (migration_is_setup_or_active(s->state)) { |
c6bd8c70 | 692 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
00458433 OW |
693 | return; |
694 | } | |
695 | ||
696 | for (cap = params; cap; cap = cap->next) { | |
697 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
698 | } | |
53dd370c DDAG |
699 | |
700 | if (migrate_postcopy_ram()) { | |
701 | if (migrate_use_compression()) { | |
702 | /* The decompression threads asynchronously write into RAM | |
703 | * rather than use the atomic copies needed to avoid | |
704 | * userfaulting. It should be possible to fix the decompression | |
705 | * threads for compatibility in future. | |
706 | */ | |
707 | error_report("Postcopy is not currently compatible with " | |
708 | "compression"); | |
32c3db5b | 709 | s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = |
53dd370c DDAG |
710 | false; |
711 | } | |
712 | } | |
00458433 OW |
713 | } |
714 | ||
85de8323 LL |
715 | void qmp_migrate_set_parameters(bool has_compress_level, |
716 | int64_t compress_level, | |
717 | bool has_compress_threads, | |
718 | int64_t compress_threads, | |
719 | bool has_decompress_threads, | |
1626fee3 | 720 | int64_t decompress_threads, |
d85a31d1 JH |
721 | bool has_cpu_throttle_initial, |
722 | int64_t cpu_throttle_initial, | |
723 | bool has_cpu_throttle_increment, | |
724 | int64_t cpu_throttle_increment, Error **errp) | |
85de8323 LL |
725 | { |
726 | MigrationState *s = migrate_get_current(); | |
727 | ||
728 | if (has_compress_level && (compress_level < 0 || compress_level > 9)) { | |
c6bd8c70 MA |
729 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level", |
730 | "is invalid, it should be in the range of 0 to 9"); | |
85de8323 LL |
731 | return; |
732 | } | |
733 | if (has_compress_threads && | |
734 | (compress_threads < 1 || compress_threads > 255)) { | |
c6bd8c70 MA |
735 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
736 | "compress_threads", | |
737 | "is invalid, it should be in the range of 1 to 255"); | |
85de8323 LL |
738 | return; |
739 | } | |
740 | if (has_decompress_threads && | |
741 | (decompress_threads < 1 || decompress_threads > 255)) { | |
c6bd8c70 MA |
742 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
743 | "decompress_threads", | |
744 | "is invalid, it should be in the range of 1 to 255"); | |
85de8323 LL |
745 | return; |
746 | } | |
d85a31d1 JH |
747 | if (has_cpu_throttle_initial && |
748 | (cpu_throttle_initial < 1 || cpu_throttle_initial > 99)) { | |
1626fee3 | 749 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
d85a31d1 | 750 | "cpu_throttle_initial", |
1626fee3 JH |
751 | "an integer in the range of 1 to 99"); |
752 | } | |
d85a31d1 JH |
753 | if (has_cpu_throttle_increment && |
754 | (cpu_throttle_increment < 1 || cpu_throttle_increment > 99)) { | |
1626fee3 | 755 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
d85a31d1 | 756 | "cpu_throttle_increment", |
1626fee3 JH |
757 | "an integer in the range of 1 to 99"); |
758 | } | |
85de8323 LL |
759 | |
760 | if (has_compress_level) { | |
761 | s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level; | |
762 | } | |
763 | if (has_compress_threads) { | |
764 | s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = compress_threads; | |
765 | } | |
766 | if (has_decompress_threads) { | |
767 | s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] = | |
768 | decompress_threads; | |
769 | } | |
d85a31d1 JH |
770 | if (has_cpu_throttle_initial) { |
771 | s->parameters[MIGRATION_PARAMETER_CPU_THROTTLE_INITIAL] = | |
772 | cpu_throttle_initial; | |
1626fee3 JH |
773 | } |
774 | ||
d85a31d1 JH |
775 | if (has_cpu_throttle_increment) { |
776 | s->parameters[MIGRATION_PARAMETER_CPU_THROTTLE_INCREMENT] = | |
777 | cpu_throttle_increment; | |
1626fee3 | 778 | } |
85de8323 LL |
779 | } |
780 | ||
4886a1bc DDAG |
781 | void qmp_migrate_start_postcopy(Error **errp) |
782 | { | |
783 | MigrationState *s = migrate_get_current(); | |
784 | ||
785 | if (!migrate_postcopy_ram()) { | |
a54d340b | 786 | error_setg(errp, "Enable postcopy with migrate_set_capability before" |
4886a1bc DDAG |
787 | " the start of migration"); |
788 | return; | |
789 | } | |
790 | ||
791 | if (s->state == MIGRATION_STATUS_NONE) { | |
792 | error_setg(errp, "Postcopy must be started after migration has been" | |
793 | " started"); | |
794 | return; | |
795 | } | |
796 | /* | |
797 | * we don't error if migration has finished since that would be racy | |
798 | * with issuing this command. | |
799 | */ | |
800 | atomic_set(&s->start_postcopy, true); | |
801 | } | |
802 | ||
065e2813 AL |
803 | /* shared migration helpers */ |
804 | ||
48781e5b | 805 | void migrate_set_state(int *state, int old_state, int new_state) |
51cf4c1a | 806 | { |
48781e5b | 807 | if (atomic_cmpxchg(state, old_state, new_state) == old_state) { |
4ba4bc5e | 808 | trace_migrate_set_state(new_state); |
b05dc723 | 809 | migrate_generate_event(new_state); |
51cf4c1a Z |
810 | } |
811 | } | |
812 | ||
bb1fadc4 | 813 | static void migrate_fd_cleanup(void *opaque) |
065e2813 | 814 | { |
bb1fadc4 PB |
815 | MigrationState *s = opaque; |
816 | ||
817 | qemu_bh_delete(s->cleanup_bh); | |
818 | s->cleanup_bh = NULL; | |
819 | ||
6c595cde DDAG |
820 | flush_page_queue(s); |
821 | ||
89a02a9f | 822 | if (s->to_dst_file) { |
9013dca5 | 823 | trace_migrate_fd_cleanup(); |
404a7c05 | 824 | qemu_mutex_unlock_iothread(); |
1d34e4bf DDAG |
825 | if (s->migration_thread_running) { |
826 | qemu_thread_join(&s->thread); | |
827 | s->migration_thread_running = false; | |
828 | } | |
404a7c05 PB |
829 | qemu_mutex_lock_iothread(); |
830 | ||
8706d2d5 | 831 | migrate_compress_threads_join(); |
89a02a9f HZ |
832 | qemu_fclose(s->to_dst_file); |
833 | s->to_dst_file = NULL; | |
065e2813 AL |
834 | } |
835 | ||
9ec055ae DDAG |
836 | assert((s->state != MIGRATION_STATUS_ACTIVE) && |
837 | (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE)); | |
7a2c1721 | 838 | |
94f5a437 | 839 | if (s->state == MIGRATION_STATUS_CANCELLING) { |
48781e5b | 840 | migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, |
94f5a437 | 841 | MIGRATION_STATUS_CANCELLED); |
7a2c1721 | 842 | } |
a3fa1d78 PB |
843 | |
844 | notifier_list_notify(&migration_state_notifiers, s); | |
065e2813 AL |
845 | } |
846 | ||
8b6b99b3 | 847 | void migrate_fd_error(MigrationState *s) |
065e2813 | 848 | { |
9013dca5 | 849 | trace_migrate_fd_error(); |
89a02a9f | 850 | assert(s->to_dst_file == NULL); |
48781e5b HZ |
851 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
852 | MIGRATION_STATUS_FAILED); | |
bb1fadc4 | 853 | notifier_list_notify(&migration_state_notifiers, s); |
458cf28e JQ |
854 | } |
855 | ||
0edda1c4 | 856 | static void migrate_fd_cancel(MigrationState *s) |
065e2813 | 857 | { |
6f2b811a | 858 | int old_state ; |
89a02a9f | 859 | QEMUFile *f = migrate_get_current()->to_dst_file; |
9013dca5 | 860 | trace_migrate_fd_cancel(); |
065e2813 | 861 | |
70b20477 DDAG |
862 | if (s->rp_state.from_dst_file) { |
863 | /* shutdown the rp socket, so causing the rp thread to shutdown */ | |
864 | qemu_file_shutdown(s->rp_state.from_dst_file); | |
865 | } | |
866 | ||
6f2b811a Z |
867 | do { |
868 | old_state = s->state; | |
f6844b99 | 869 | if (!migration_is_setup_or_active(old_state)) { |
6f2b811a Z |
870 | break; |
871 | } | |
48781e5b | 872 | migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); |
31194731 | 873 | } while (s->state != MIGRATION_STATUS_CANCELLING); |
a26ba26e DDAG |
874 | |
875 | /* | |
876 | * If we're unlucky the migration code might be stuck somewhere in a | |
877 | * send/write while the network has failed and is waiting to timeout; | |
878 | * if we've got shutdown(2) available then we can force it to quit. | |
879 | * The outgoing qemu file gets closed in migrate_fd_cleanup that is | |
880 | * called in a bh, so there is no race against this cancel. | |
881 | */ | |
31194731 | 882 | if (s->state == MIGRATION_STATUS_CANCELLING && f) { |
a26ba26e DDAG |
883 | qemu_file_shutdown(f); |
884 | } | |
065e2813 AL |
885 | } |
886 | ||
99a0db9b GH |
887 | void add_migration_state_change_notifier(Notifier *notify) |
888 | { | |
889 | notifier_list_add(&migration_state_notifiers, notify); | |
890 | } | |
891 | ||
892 | void remove_migration_state_change_notifier(Notifier *notify) | |
893 | { | |
31552529 | 894 | notifier_remove(notify); |
99a0db9b GH |
895 | } |
896 | ||
02edd2e7 | 897 | bool migration_in_setup(MigrationState *s) |
afe2df69 | 898 | { |
31194731 | 899 | return s->state == MIGRATION_STATUS_SETUP; |
afe2df69 GH |
900 | } |
901 | ||
7073693b | 902 | bool migration_has_finished(MigrationState *s) |
99a0db9b | 903 | { |
31194731 | 904 | return s->state == MIGRATION_STATUS_COMPLETED; |
99a0db9b | 905 | } |
0edda1c4 | 906 | |
afe2df69 GH |
907 | bool migration_has_failed(MigrationState *s) |
908 | { | |
31194731 HZ |
909 | return (s->state == MIGRATION_STATUS_CANCELLED || |
910 | s->state == MIGRATION_STATUS_FAILED); | |
afe2df69 GH |
911 | } |
912 | ||
9ec055ae DDAG |
913 | bool migration_in_postcopy(MigrationState *s) |
914 | { | |
915 | return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
916 | } | |
917 | ||
b82fc321 DDAG |
918 | bool migration_in_postcopy_after_devices(MigrationState *s) |
919 | { | |
920 | return migration_in_postcopy(s) && s->postcopy_after_devices; | |
921 | } | |
922 | ||
aefeb18b | 923 | MigrationState *migrate_init(const MigrationParams *params) |
0edda1c4 | 924 | { |
17549e84 | 925 | MigrationState *s = migrate_get_current(); |
bbf6da32 | 926 | |
389775d1 DDAG |
927 | /* |
928 | * Reinitialise all migration state, except | |
929 | * parameters/capabilities that the user set, and | |
930 | * locks. | |
931 | */ | |
932 | s->bytes_xfer = 0; | |
933 | s->xfer_limit = 0; | |
934 | s->cleanup_bh = 0; | |
89a02a9f | 935 | s->to_dst_file = NULL; |
389775d1 | 936 | s->state = MIGRATION_STATUS_NONE; |
6607ae23 | 937 | s->params = *params; |
389775d1 DDAG |
938 | s->rp_state.from_dst_file = NULL; |
939 | s->rp_state.error = false; | |
940 | s->mbps = 0.0; | |
941 | s->downtime = 0; | |
942 | s->expected_downtime = 0; | |
943 | s->dirty_pages_rate = 0; | |
944 | s->dirty_bytes_rate = 0; | |
945 | s->setup_time = 0; | |
946 | s->dirty_sync_count = 0; | |
947 | s->start_postcopy = false; | |
b82fc321 | 948 | s->postcopy_after_devices = false; |
389775d1 DDAG |
949 | s->migration_thread_running = false; |
950 | s->last_req_rb = NULL; | |
951 | ||
48781e5b | 952 | migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); |
0edda1c4 | 953 | |
6c595cde DDAG |
954 | QSIMPLEQ_INIT(&s->src_page_requests); |
955 | ||
bc72ad67 | 956 | s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
0edda1c4 JQ |
957 | return s; |
958 | } | |
cab30143 | 959 | |
fa2756b7 AL |
960 | static GSList *migration_blockers; |
961 | ||
962 | void migrate_add_blocker(Error *reason) | |
963 | { | |
964 | migration_blockers = g_slist_prepend(migration_blockers, reason); | |
965 | } | |
966 | ||
967 | void migrate_del_blocker(Error *reason) | |
968 | { | |
969 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
970 | } | |
971 | ||
bf1ae1f4 DDAG |
972 | void qmp_migrate_incoming(const char *uri, Error **errp) |
973 | { | |
974 | Error *local_err = NULL; | |
4debb5f5 | 975 | static bool once = true; |
bf1ae1f4 DDAG |
976 | |
977 | if (!deferred_incoming) { | |
4debb5f5 | 978 | error_setg(errp, "For use with '-incoming defer'"); |
bf1ae1f4 DDAG |
979 | return; |
980 | } | |
4debb5f5 DDAG |
981 | if (!once) { |
982 | error_setg(errp, "The incoming migration has already been started"); | |
983 | } | |
bf1ae1f4 DDAG |
984 | |
985 | qemu_start_incoming_migration(uri, &local_err); | |
986 | ||
987 | if (local_err) { | |
988 | error_propagate(errp, local_err); | |
989 | return; | |
990 | } | |
991 | ||
4debb5f5 | 992 | once = false; |
bf1ae1f4 DDAG |
993 | } |
994 | ||
24f3902b GK |
995 | bool migration_is_blocked(Error **errp) |
996 | { | |
997 | if (qemu_savevm_state_blocked(errp)) { | |
998 | return true; | |
999 | } | |
1000 | ||
1001 | if (migration_blockers) { | |
1002 | *errp = error_copy(migration_blockers->data); | |
1003 | return true; | |
1004 | } | |
1005 | ||
1006 | return false; | |
1007 | } | |
1008 | ||
e1c37d0e LC |
1009 | void qmp_migrate(const char *uri, bool has_blk, bool blk, |
1010 | bool has_inc, bool inc, bool has_detach, bool detach, | |
1011 | Error **errp) | |
cab30143 | 1012 | { |
be7059cd | 1013 | Error *local_err = NULL; |
17549e84 | 1014 | MigrationState *s = migrate_get_current(); |
6607ae23 | 1015 | MigrationParams params; |
cab30143 | 1016 | const char *p; |
cab30143 | 1017 | |
8c0426ae PP |
1018 | params.blk = has_blk && blk; |
1019 | params.shared = has_inc && inc; | |
6607ae23 | 1020 | |
f6844b99 | 1021 | if (migration_is_setup_or_active(s->state) || |
31194731 | 1022 | s->state == MIGRATION_STATUS_CANCELLING) { |
c6bd8c70 | 1023 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
e1c37d0e | 1024 | return; |
cab30143 | 1025 | } |
ca99993a DDAG |
1026 | if (runstate_check(RUN_STATE_INMIGRATE)) { |
1027 | error_setg(errp, "Guest is waiting for an incoming migration"); | |
1028 | return; | |
1029 | } | |
1030 | ||
24f3902b | 1031 | if (migration_is_blocked(errp)) { |
e1c37d0e | 1032 | return; |
fa2756b7 AL |
1033 | } |
1034 | ||
6607ae23 | 1035 | s = migrate_init(¶ms); |
cab30143 JQ |
1036 | |
1037 | if (strstart(uri, "tcp:", &p)) { | |
f37afb5a | 1038 | tcp_start_outgoing_migration(s, p, &local_err); |
2da776db | 1039 | #ifdef CONFIG_RDMA |
41310c68 | 1040 | } else if (strstart(uri, "rdma:", &p)) { |
2da776db MH |
1041 | rdma_start_outgoing_migration(s, p, &local_err); |
1042 | #endif | |
cab30143 JQ |
1043 | #if !defined(WIN32) |
1044 | } else if (strstart(uri, "exec:", &p)) { | |
f37afb5a | 1045 | exec_start_outgoing_migration(s, p, &local_err); |
cab30143 | 1046 | } else if (strstart(uri, "unix:", &p)) { |
f37afb5a | 1047 | unix_start_outgoing_migration(s, p, &local_err); |
cab30143 | 1048 | } else if (strstart(uri, "fd:", &p)) { |
f37afb5a | 1049 | fd_start_outgoing_migration(s, p, &local_err); |
cab30143 | 1050 | #endif |
99a0db9b | 1051 | } else { |
c6bd8c70 MA |
1052 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri", |
1053 | "a valid migration protocol"); | |
48781e5b HZ |
1054 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1055 | MIGRATION_STATUS_FAILED); | |
e1c37d0e | 1056 | return; |
cab30143 JQ |
1057 | } |
1058 | ||
f37afb5a | 1059 | if (local_err) { |
342ab8d1 | 1060 | migrate_fd_error(s); |
f37afb5a | 1061 | error_propagate(errp, local_err); |
e1c37d0e | 1062 | return; |
1299c631 | 1063 | } |
cab30143 JQ |
1064 | } |
1065 | ||
6cdedb07 | 1066 | void qmp_migrate_cancel(Error **errp) |
cab30143 | 1067 | { |
17549e84 | 1068 | migrate_fd_cancel(migrate_get_current()); |
cab30143 JQ |
1069 | } |
1070 | ||
9e1ba4cc OW |
1071 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) |
1072 | { | |
1073 | MigrationState *s = migrate_get_current(); | |
c91e681a | 1074 | int64_t new_size; |
9e1ba4cc OW |
1075 | |
1076 | /* Check for truncation */ | |
1077 | if (value != (size_t)value) { | |
c6bd8c70 MA |
1078 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", |
1079 | "exceeding address space"); | |
9e1ba4cc OW |
1080 | return; |
1081 | } | |
1082 | ||
a5615b14 OW |
1083 | /* Cache should not be larger than guest ram size */ |
1084 | if (value > ram_bytes_total()) { | |
c6bd8c70 MA |
1085 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", |
1086 | "exceeds guest ram size "); | |
a5615b14 OW |
1087 | return; |
1088 | } | |
1089 | ||
c91e681a OW |
1090 | new_size = xbzrle_cache_resize(value); |
1091 | if (new_size < 0) { | |
c6bd8c70 MA |
1092 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", |
1093 | "is smaller than page size"); | |
c91e681a OW |
1094 | return; |
1095 | } | |
1096 | ||
1097 | s->xbzrle_cache_size = new_size; | |
9e1ba4cc OW |
1098 | } |
1099 | ||
1100 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
1101 | { | |
1102 | return migrate_xbzrle_cache_size(); | |
1103 | } | |
1104 | ||
3dc85383 | 1105 | void qmp_migrate_set_speed(int64_t value, Error **errp) |
cab30143 | 1106 | { |
cab30143 JQ |
1107 | MigrationState *s; |
1108 | ||
3dc85383 LC |
1109 | if (value < 0) { |
1110 | value = 0; | |
99a0db9b | 1111 | } |
442773ce PB |
1112 | if (value > SIZE_MAX) { |
1113 | value = SIZE_MAX; | |
1114 | } | |
cab30143 | 1115 | |
17549e84 | 1116 | s = migrate_get_current(); |
3dc85383 | 1117 | s->bandwidth_limit = value; |
89a02a9f HZ |
1118 | if (s->to_dst_file) { |
1119 | qemu_file_set_rate_limit(s->to_dst_file, | |
1120 | s->bandwidth_limit / XFER_LIMIT_RATIO); | |
442773ce | 1121 | } |
cab30143 JQ |
1122 | } |
1123 | ||
4f0a993b | 1124 | void qmp_migrate_set_downtime(double value, Error **errp) |
cab30143 | 1125 | { |
4f0a993b LC |
1126 | value *= 1e9; |
1127 | value = MAX(0, MIN(UINT64_MAX, value)); | |
1128 | max_downtime = (uint64_t)value; | |
99a0db9b | 1129 | } |
17ad9b35 | 1130 | |
53dd370c DDAG |
1131 | bool migrate_postcopy_ram(void) |
1132 | { | |
1133 | MigrationState *s; | |
1134 | ||
1135 | s = migrate_get_current(); | |
1136 | ||
32c3db5b | 1137 | return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM]; |
53dd370c DDAG |
1138 | } |
1139 | ||
bde1e2ec CV |
1140 | bool migrate_auto_converge(void) |
1141 | { | |
1142 | MigrationState *s; | |
1143 | ||
1144 | s = migrate_get_current(); | |
1145 | ||
1146 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; | |
1147 | } | |
1148 | ||
323004a3 PL |
1149 | bool migrate_zero_blocks(void) |
1150 | { | |
1151 | MigrationState *s; | |
1152 | ||
1153 | s = migrate_get_current(); | |
1154 | ||
1155 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; | |
1156 | } | |
1157 | ||
8706d2d5 LL |
1158 | bool migrate_use_compression(void) |
1159 | { | |
dde4e694 LL |
1160 | MigrationState *s; |
1161 | ||
1162 | s = migrate_get_current(); | |
1163 | ||
1164 | return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS]; | |
8706d2d5 LL |
1165 | } |
1166 | ||
1167 | int migrate_compress_level(void) | |
1168 | { | |
1169 | MigrationState *s; | |
1170 | ||
1171 | s = migrate_get_current(); | |
1172 | ||
43c60a81 | 1173 | return s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL]; |
8706d2d5 LL |
1174 | } |
1175 | ||
1176 | int migrate_compress_threads(void) | |
1177 | { | |
1178 | MigrationState *s; | |
1179 | ||
1180 | s = migrate_get_current(); | |
1181 | ||
43c60a81 | 1182 | return s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS]; |
8706d2d5 LL |
1183 | } |
1184 | ||
3fcb38c2 LL |
1185 | int migrate_decompress_threads(void) |
1186 | { | |
1187 | MigrationState *s; | |
1188 | ||
1189 | s = migrate_get_current(); | |
1190 | ||
43c60a81 | 1191 | return s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS]; |
3fcb38c2 LL |
1192 | } |
1193 | ||
b05dc723 JQ |
1194 | bool migrate_use_events(void) |
1195 | { | |
1196 | MigrationState *s; | |
1197 | ||
1198 | s = migrate_get_current(); | |
1199 | ||
1200 | return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS]; | |
1201 | } | |
1202 | ||
17ad9b35 OW |
1203 | int migrate_use_xbzrle(void) |
1204 | { | |
1205 | MigrationState *s; | |
1206 | ||
1207 | s = migrate_get_current(); | |
1208 | ||
1209 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
1210 | } | |
1211 | ||
1212 | int64_t migrate_xbzrle_cache_size(void) | |
1213 | { | |
1214 | MigrationState *s; | |
1215 | ||
1216 | s = migrate_get_current(); | |
1217 | ||
1218 | return s->xbzrle_cache_size; | |
1219 | } | |
0d82d0e8 | 1220 | |
70b20477 DDAG |
1221 | /* migration thread support */ |
1222 | /* | |
1223 | * Something bad happened to the RP stream, mark an error | |
1224 | * The caller shall print or trace something to indicate why | |
1225 | */ | |
1226 | static void mark_source_rp_bad(MigrationState *s) | |
1227 | { | |
1228 | s->rp_state.error = true; | |
1229 | } | |
1230 | ||
1231 | static struct rp_cmd_args { | |
1232 | ssize_t len; /* -1 = variable */ | |
1233 | const char *name; | |
1234 | } rp_cmd_args[] = { | |
1235 | [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, | |
1236 | [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, | |
1237 | [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, | |
1e2d90eb DDAG |
1238 | [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, |
1239 | [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, | |
70b20477 DDAG |
1240 | [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, |
1241 | }; | |
1242 | ||
1e2d90eb DDAG |
1243 | /* |
1244 | * Process a request for pages received on the return path, | |
1245 | * We're allowed to send more than requested (e.g. to round to our page size) | |
1246 | * and we don't need to send pages that have already been sent. | |
1247 | */ | |
1248 | static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, | |
1249 | ram_addr_t start, size_t len) | |
1250 | { | |
6c595cde DDAG |
1251 | long our_host_ps = getpagesize(); |
1252 | ||
1e2d90eb | 1253 | trace_migrate_handle_rp_req_pages(rbname, start, len); |
6c595cde DDAG |
1254 | |
1255 | /* | |
1256 | * Since we currently insist on matching page sizes, just sanity check | |
1257 | * we're being asked for whole host pages. | |
1258 | */ | |
1259 | if (start & (our_host_ps-1) || | |
1260 | (len & (our_host_ps-1))) { | |
1261 | error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT | |
1262 | " len: %zd", __func__, start, len); | |
1263 | mark_source_rp_bad(ms); | |
1264 | return; | |
1265 | } | |
1266 | ||
1267 | if (ram_save_queue_pages(ms, rbname, start, len)) { | |
1268 | mark_source_rp_bad(ms); | |
1269 | } | |
1e2d90eb DDAG |
1270 | } |
1271 | ||
70b20477 DDAG |
1272 | /* |
1273 | * Handles messages sent on the return path towards the source VM | |
1274 | * | |
1275 | */ | |
1276 | static void *source_return_path_thread(void *opaque) | |
1277 | { | |
1278 | MigrationState *ms = opaque; | |
1279 | QEMUFile *rp = ms->rp_state.from_dst_file; | |
1280 | uint16_t header_len, header_type; | |
568b01ca | 1281 | uint8_t buf[512]; |
70b20477 | 1282 | uint32_t tmp32, sibling_error; |
1e2d90eb DDAG |
1283 | ram_addr_t start = 0; /* =0 to silence warning */ |
1284 | size_t len = 0, expected_len; | |
70b20477 DDAG |
1285 | int res; |
1286 | ||
1287 | trace_source_return_path_thread_entry(); | |
1288 | while (!ms->rp_state.error && !qemu_file_get_error(rp) && | |
1289 | migration_is_setup_or_active(ms->state)) { | |
1290 | trace_source_return_path_thread_loop_top(); | |
1291 | header_type = qemu_get_be16(rp); | |
1292 | header_len = qemu_get_be16(rp); | |
1293 | ||
1294 | if (header_type >= MIG_RP_MSG_MAX || | |
1295 | header_type == MIG_RP_MSG_INVALID) { | |
1296 | error_report("RP: Received invalid message 0x%04x length 0x%04x", | |
1297 | header_type, header_len); | |
1298 | mark_source_rp_bad(ms); | |
1299 | goto out; | |
1300 | } | |
1301 | ||
1302 | if ((rp_cmd_args[header_type].len != -1 && | |
1303 | header_len != rp_cmd_args[header_type].len) || | |
568b01ca | 1304 | header_len > sizeof(buf)) { |
70b20477 DDAG |
1305 | error_report("RP: Received '%s' message (0x%04x) with" |
1306 | "incorrect length %d expecting %zu", | |
1307 | rp_cmd_args[header_type].name, header_type, header_len, | |
1308 | (size_t)rp_cmd_args[header_type].len); | |
1309 | mark_source_rp_bad(ms); | |
1310 | goto out; | |
1311 | } | |
1312 | ||
1313 | /* We know we've got a valid header by this point */ | |
1314 | res = qemu_get_buffer(rp, buf, header_len); | |
1315 | if (res != header_len) { | |
1316 | error_report("RP: Failed reading data for message 0x%04x" | |
1317 | " read %d expected %d", | |
1318 | header_type, res, header_len); | |
1319 | mark_source_rp_bad(ms); | |
1320 | goto out; | |
1321 | } | |
1322 | ||
1323 | /* OK, we have the message and the data */ | |
1324 | switch (header_type) { | |
1325 | case MIG_RP_MSG_SHUT: | |
1326 | sibling_error = be32_to_cpup((uint32_t *)buf); | |
1327 | trace_source_return_path_thread_shut(sibling_error); | |
1328 | if (sibling_error) { | |
1329 | error_report("RP: Sibling indicated error %d", sibling_error); | |
1330 | mark_source_rp_bad(ms); | |
1331 | } | |
1332 | /* | |
1333 | * We'll let the main thread deal with closing the RP | |
1334 | * we could do a shutdown(2) on it, but we're the only user | |
1335 | * anyway, so there's nothing gained. | |
1336 | */ | |
1337 | goto out; | |
1338 | ||
1339 | case MIG_RP_MSG_PONG: | |
1340 | tmp32 = be32_to_cpup((uint32_t *)buf); | |
1341 | trace_source_return_path_thread_pong(tmp32); | |
1342 | break; | |
1343 | ||
1e2d90eb DDAG |
1344 | case MIG_RP_MSG_REQ_PAGES: |
1345 | start = be64_to_cpup((uint64_t *)buf); | |
1346 | len = be32_to_cpup((uint32_t *)(buf + 8)); | |
1347 | migrate_handle_rp_req_pages(ms, NULL, start, len); | |
1348 | break; | |
1349 | ||
1350 | case MIG_RP_MSG_REQ_PAGES_ID: | |
1351 | expected_len = 12 + 1; /* header + termination */ | |
1352 | ||
1353 | if (header_len >= expected_len) { | |
1354 | start = be64_to_cpup((uint64_t *)buf); | |
1355 | len = be32_to_cpup((uint32_t *)(buf + 8)); | |
1356 | /* Now we expect an idstr */ | |
1357 | tmp32 = buf[12]; /* Length of the following idstr */ | |
1358 | buf[13 + tmp32] = '\0'; | |
1359 | expected_len += tmp32; | |
1360 | } | |
1361 | if (header_len != expected_len) { | |
1362 | error_report("RP: Req_Page_id with length %d expecting %zd", | |
1363 | header_len, expected_len); | |
1364 | mark_source_rp_bad(ms); | |
1365 | goto out; | |
1366 | } | |
1367 | migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); | |
1368 | break; | |
1369 | ||
70b20477 DDAG |
1370 | default: |
1371 | break; | |
1372 | } | |
1373 | } | |
5df5416e | 1374 | if (qemu_file_get_error(rp)) { |
70b20477 DDAG |
1375 | trace_source_return_path_thread_bad_end(); |
1376 | mark_source_rp_bad(ms); | |
1377 | } | |
1378 | ||
1379 | trace_source_return_path_thread_end(); | |
1380 | out: | |
1381 | ms->rp_state.from_dst_file = NULL; | |
1382 | qemu_fclose(rp); | |
1383 | return NULL; | |
1384 | } | |
1385 | ||
70b20477 DDAG |
1386 | static int open_return_path_on_source(MigrationState *ms) |
1387 | { | |
1388 | ||
89a02a9f | 1389 | ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); |
70b20477 DDAG |
1390 | if (!ms->rp_state.from_dst_file) { |
1391 | return -1; | |
1392 | } | |
1393 | ||
1394 | trace_open_return_path_on_source(); | |
1395 | qemu_thread_create(&ms->rp_state.rp_thread, "return path", | |
1396 | source_return_path_thread, ms, QEMU_THREAD_JOINABLE); | |
1397 | ||
1398 | trace_open_return_path_on_source_continue(); | |
1399 | ||
1400 | return 0; | |
1401 | } | |
1402 | ||
70b20477 DDAG |
1403 | /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ |
1404 | static int await_return_path_close_on_source(MigrationState *ms) | |
1405 | { | |
1406 | /* | |
1407 | * If this is a normal exit then the destination will send a SHUT and the | |
1408 | * rp_thread will exit, however if there's an error we need to cause | |
1409 | * it to exit. | |
1410 | */ | |
89a02a9f | 1411 | if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) { |
70b20477 DDAG |
1412 | /* |
1413 | * shutdown(2), if we have it, will cause it to unblock if it's stuck | |
1414 | * waiting for the destination. | |
1415 | */ | |
1416 | qemu_file_shutdown(ms->rp_state.from_dst_file); | |
1417 | mark_source_rp_bad(ms); | |
1418 | } | |
1419 | trace_await_return_path_close_on_source_joining(); | |
1420 | qemu_thread_join(&ms->rp_state.rp_thread); | |
1421 | trace_await_return_path_close_on_source_close(); | |
1422 | return ms->rp_state.error; | |
1423 | } | |
1424 | ||
1d34e4bf DDAG |
1425 | /* |
1426 | * Switch from normal iteration to postcopy | |
1427 | * Returns non-0 on error | |
1428 | */ | |
1429 | static int postcopy_start(MigrationState *ms, bool *old_vm_running) | |
1430 | { | |
1431 | int ret; | |
1432 | const QEMUSizedBuffer *qsb; | |
1433 | int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
48781e5b | 1434 | migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, |
1d34e4bf DDAG |
1435 | MIGRATION_STATUS_POSTCOPY_ACTIVE); |
1436 | ||
1437 | trace_postcopy_start(); | |
1438 | qemu_mutex_lock_iothread(); | |
1439 | trace_postcopy_start_set_run(); | |
1440 | ||
1441 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
1442 | *old_vm_running = runstate_is_running(); | |
1443 | global_state_store(); | |
1444 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
76b1c7fe KW |
1445 | if (ret < 0) { |
1446 | goto fail; | |
1447 | } | |
1d34e4bf | 1448 | |
76b1c7fe | 1449 | ret = bdrv_inactivate_all(); |
1d34e4bf DDAG |
1450 | if (ret < 0) { |
1451 | goto fail; | |
1452 | } | |
1453 | ||
1c0d249d DDAG |
1454 | /* |
1455 | * Cause any non-postcopiable, but iterative devices to | |
1456 | * send out their final data. | |
1457 | */ | |
89a02a9f | 1458 | qemu_savevm_state_complete_precopy(ms->to_dst_file, true); |
1c0d249d | 1459 | |
1d34e4bf DDAG |
1460 | /* |
1461 | * in Finish migrate and with the io-lock held everything should | |
1462 | * be quiet, but we've potentially still got dirty pages and we | |
1463 | * need to tell the destination to throw any pages it's already received | |
1464 | * that are dirty | |
1465 | */ | |
1466 | if (ram_postcopy_send_discard_bitmap(ms)) { | |
1467 | error_report("postcopy send discard bitmap failed"); | |
1468 | goto fail; | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * send rest of state - note things that are doing postcopy | |
1473 | * will notice we're in POSTCOPY_ACTIVE and not actually | |
1474 | * wrap their state up here | |
1475 | */ | |
89a02a9f | 1476 | qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX); |
1d34e4bf | 1477 | /* Ping just for debugging, helps line traces up */ |
89a02a9f | 1478 | qemu_savevm_send_ping(ms->to_dst_file, 2); |
1d34e4bf DDAG |
1479 | |
1480 | /* | |
1481 | * While loading the device state we may trigger page transfer | |
1482 | * requests and the fd must be free to process those, and thus | |
1483 | * the destination must read the whole device state off the fd before | |
1484 | * it starts processing it. Unfortunately the ad-hoc migration format | |
1485 | * doesn't allow the destination to know the size to read without fully | |
1486 | * parsing it through each devices load-state code (especially the open | |
1487 | * coded devices that use get/put). | |
1488 | * So we wrap the device state up in a package with a length at the start; | |
1489 | * to do this we use a qemu_buf to hold the whole of the device state. | |
1490 | */ | |
1491 | QEMUFile *fb = qemu_bufopen("w", NULL); | |
1492 | if (!fb) { | |
1493 | error_report("Failed to create buffered file"); | |
1494 | goto fail; | |
1495 | } | |
1496 | ||
c76201ab DDAG |
1497 | /* |
1498 | * Make sure the receiver can get incoming pages before we send the rest | |
1499 | * of the state | |
1500 | */ | |
1501 | qemu_savevm_send_postcopy_listen(fb); | |
1502 | ||
1c0d249d | 1503 | qemu_savevm_state_complete_precopy(fb, false); |
1d34e4bf DDAG |
1504 | qemu_savevm_send_ping(fb, 3); |
1505 | ||
1506 | qemu_savevm_send_postcopy_run(fb); | |
1507 | ||
1508 | /* <><> end of stuff going into the package */ | |
1509 | qsb = qemu_buf_get(fb); | |
1510 | ||
1511 | /* Now send that blob */ | |
89a02a9f | 1512 | if (qemu_savevm_send_packaged(ms->to_dst_file, qsb)) { |
1d34e4bf DDAG |
1513 | goto fail_closefb; |
1514 | } | |
1515 | qemu_fclose(fb); | |
b82fc321 DDAG |
1516 | |
1517 | /* Send a notify to give a chance for anything that needs to happen | |
1518 | * at the transition to postcopy and after the device state; in particular | |
1519 | * spice needs to trigger a transition now | |
1520 | */ | |
1521 | ms->postcopy_after_devices = true; | |
1522 | notifier_list_notify(&migration_state_notifiers, ms); | |
1523 | ||
1d34e4bf DDAG |
1524 | ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop; |
1525 | ||
1526 | qemu_mutex_unlock_iothread(); | |
1527 | ||
1528 | /* | |
1529 | * Although this ping is just for debug, it could potentially be | |
1530 | * used for getting a better measurement of downtime at the source. | |
1531 | */ | |
89a02a9f | 1532 | qemu_savevm_send_ping(ms->to_dst_file, 4); |
1d34e4bf | 1533 | |
89a02a9f | 1534 | ret = qemu_file_get_error(ms->to_dst_file); |
1d34e4bf DDAG |
1535 | if (ret) { |
1536 | error_report("postcopy_start: Migration stream errored"); | |
48781e5b | 1537 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1d34e4bf DDAG |
1538 | MIGRATION_STATUS_FAILED); |
1539 | } | |
1540 | ||
1541 | return ret; | |
1542 | ||
1543 | fail_closefb: | |
1544 | qemu_fclose(fb); | |
1545 | fail: | |
48781e5b | 1546 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1d34e4bf DDAG |
1547 | MIGRATION_STATUS_FAILED); |
1548 | qemu_mutex_unlock_iothread(); | |
1549 | return -1; | |
1550 | } | |
1551 | ||
09f6c85e DDAG |
1552 | /** |
1553 | * migration_completion: Used by migration_thread when there's not much left. | |
1554 | * The caller 'breaks' the loop when this returns. | |
1555 | * | |
1556 | * @s: Current migration state | |
36f48567 | 1557 | * @current_active_state: The migration state we expect to be in |
09f6c85e DDAG |
1558 | * @*old_vm_running: Pointer to old_vm_running flag |
1559 | * @*start_time: Pointer to time to update | |
1560 | */ | |
36f48567 DDAG |
1561 | static void migration_completion(MigrationState *s, int current_active_state, |
1562 | bool *old_vm_running, | |
09f6c85e DDAG |
1563 | int64_t *start_time) |
1564 | { | |
1565 | int ret; | |
1566 | ||
b10ac0c4 DDAG |
1567 | if (s->state == MIGRATION_STATUS_ACTIVE) { |
1568 | qemu_mutex_lock_iothread(); | |
1569 | *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
1570 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); | |
1571 | *old_vm_running = runstate_is_running(); | |
1572 | ret = global_state_store(); | |
1573 | ||
1574 | if (!ret) { | |
1575 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
76b1c7fe KW |
1576 | if (ret >= 0) { |
1577 | ret = bdrv_inactivate_all(); | |
1578 | } | |
b10ac0c4 | 1579 | if (ret >= 0) { |
89a02a9f HZ |
1580 | qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); |
1581 | qemu_savevm_state_complete_precopy(s->to_dst_file, false); | |
b10ac0c4 DDAG |
1582 | } |
1583 | } | |
1584 | qemu_mutex_unlock_iothread(); | |
09f6c85e | 1585 | |
b10ac0c4 DDAG |
1586 | if (ret < 0) { |
1587 | goto fail; | |
09f6c85e | 1588 | } |
b10ac0c4 DDAG |
1589 | } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { |
1590 | trace_migration_completion_postcopy_end(); | |
1591 | ||
89a02a9f | 1592 | qemu_savevm_state_complete_postcopy(s->to_dst_file); |
b10ac0c4 | 1593 | trace_migration_completion_postcopy_end_after_complete(); |
09f6c85e | 1594 | } |
09f6c85e | 1595 | |
b10ac0c4 DDAG |
1596 | /* |
1597 | * If rp was opened we must clean up the thread before | |
1598 | * cleaning everything else up (since if there are no failures | |
1599 | * it will wait for the destination to send it's status in | |
1600 | * a SHUT command). | |
1601 | * Postcopy opens rp if enabled (even if it's not avtivated) | |
1602 | */ | |
1603 | if (migrate_postcopy_ram()) { | |
1604 | int rp_error; | |
1605 | trace_migration_completion_postcopy_end_before_rp(); | |
1606 | rp_error = await_return_path_close_on_source(s); | |
1607 | trace_migration_completion_postcopy_end_after_rp(rp_error); | |
1608 | if (rp_error) { | |
1609 | goto fail; | |
1610 | } | |
09f6c85e DDAG |
1611 | } |
1612 | ||
89a02a9f | 1613 | if (qemu_file_get_error(s->to_dst_file)) { |
09f6c85e DDAG |
1614 | trace_migration_completion_file_err(); |
1615 | goto fail; | |
1616 | } | |
1617 | ||
48781e5b HZ |
1618 | migrate_set_state(&s->state, current_active_state, |
1619 | MIGRATION_STATUS_COMPLETED); | |
09f6c85e DDAG |
1620 | return; |
1621 | ||
1622 | fail: | |
48781e5b HZ |
1623 | migrate_set_state(&s->state, current_active_state, |
1624 | MIGRATION_STATUS_FAILED); | |
09f6c85e DDAG |
1625 | } |
1626 | ||
70b20477 DDAG |
1627 | /* |
1628 | * Master migration thread on the source VM. | |
1629 | * It drives the migration and pumps the data down the outgoing channel. | |
1630 | */ | |
5f496a1b | 1631 | static void *migration_thread(void *opaque) |
0d82d0e8 | 1632 | { |
9848a404 | 1633 | MigrationState *s = opaque; |
1d34e4bf | 1634 | /* Used by the bandwidth calcs, updated later */ |
bc72ad67 AB |
1635 | int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
1636 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); | |
be7172e2 | 1637 | int64_t initial_bytes = 0; |
0d82d0e8 | 1638 | int64_t max_size = 0; |
a3fa1d78 | 1639 | int64_t start_time = initial_time; |
94f5a437 | 1640 | int64_t end_time; |
a3fa1d78 | 1641 | bool old_vm_running = false; |
1d34e4bf DDAG |
1642 | bool entered_postcopy = false; |
1643 | /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */ | |
1644 | enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE; | |
76f5933a | 1645 | |
ab28bd23 PB |
1646 | rcu_register_thread(); |
1647 | ||
89a02a9f | 1648 | qemu_savevm_state_header(s->to_dst_file); |
1d34e4bf DDAG |
1649 | |
1650 | if (migrate_postcopy_ram()) { | |
1651 | /* Now tell the dest that it should open its end so it can reply */ | |
89a02a9f | 1652 | qemu_savevm_send_open_return_path(s->to_dst_file); |
1d34e4bf DDAG |
1653 | |
1654 | /* And do a ping that will make stuff easier to debug */ | |
89a02a9f | 1655 | qemu_savevm_send_ping(s->to_dst_file, 1); |
1d34e4bf DDAG |
1656 | |
1657 | /* | |
1658 | * Tell the destination that we *might* want to do postcopy later; | |
1659 | * if the other end can't do postcopy it should fail now, nice and | |
1660 | * early. | |
1661 | */ | |
89a02a9f | 1662 | qemu_savevm_send_postcopy_advise(s->to_dst_file); |
1d34e4bf DDAG |
1663 | } |
1664 | ||
89a02a9f | 1665 | qemu_savevm_state_begin(s->to_dst_file, &s->params); |
0d82d0e8 | 1666 | |
bc72ad67 | 1667 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; |
1d34e4bf | 1668 | current_active_state = MIGRATION_STATUS_ACTIVE; |
48781e5b HZ |
1669 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1670 | MIGRATION_STATUS_ACTIVE); | |
29ae8a41 | 1671 | |
9ec055ae DDAG |
1672 | trace_migration_thread_setup_complete(); |
1673 | ||
1674 | while (s->state == MIGRATION_STATUS_ACTIVE || | |
1675 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
a3e879cd | 1676 | int64_t current_time; |
c369f40d | 1677 | uint64_t pending_size; |
0d82d0e8 | 1678 | |
89a02a9f | 1679 | if (!qemu_file_rate_limit(s->to_dst_file)) { |
c31b098f DDAG |
1680 | uint64_t pend_post, pend_nonpost; |
1681 | ||
89a02a9f | 1682 | qemu_savevm_state_pending(s->to_dst_file, max_size, &pend_nonpost, |
c31b098f DDAG |
1683 | &pend_post); |
1684 | pending_size = pend_nonpost + pend_post; | |
1685 | trace_migrate_pending(pending_size, max_size, | |
1686 | pend_post, pend_nonpost); | |
b22ff1fb | 1687 | if (pending_size && pending_size >= max_size) { |
1d34e4bf DDAG |
1688 | /* Still a significant amount to transfer */ |
1689 | ||
1d34e4bf DDAG |
1690 | if (migrate_postcopy_ram() && |
1691 | s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE && | |
1692 | pend_nonpost <= max_size && | |
1693 | atomic_read(&s->start_postcopy)) { | |
1694 | ||
1695 | if (!postcopy_start(s, &old_vm_running)) { | |
1696 | current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE; | |
1697 | entered_postcopy = true; | |
1698 | } | |
1699 | ||
1700 | continue; | |
1701 | } | |
1702 | /* Just another iteration step */ | |
89a02a9f | 1703 | qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy); |
c369f40d | 1704 | } else { |
09f6c85e | 1705 | trace_migration_thread_low_pending(pending_size); |
1d34e4bf | 1706 | migration_completion(s, current_active_state, |
36f48567 | 1707 | &old_vm_running, &start_time); |
09f6c85e | 1708 | break; |
c369f40d JQ |
1709 | } |
1710 | } | |
f4410a5d | 1711 | |
89a02a9f | 1712 | if (qemu_file_get_error(s->to_dst_file)) { |
48781e5b HZ |
1713 | migrate_set_state(&s->state, current_active_state, |
1714 | MIGRATION_STATUS_FAILED); | |
1d34e4bf | 1715 | trace_migration_thread_file_err(); |
fd45ee2c PB |
1716 | break; |
1717 | } | |
bc72ad67 | 1718 | current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
0d82d0e8 | 1719 | if (current_time >= initial_time + BUFFER_DELAY) { |
89a02a9f HZ |
1720 | uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) - |
1721 | initial_bytes; | |
77417f10 | 1722 | uint64_t time_spent = current_time - initial_time; |
a694ee34 | 1723 | double bandwidth = (double)transferred_bytes / time_spent; |
0d82d0e8 JQ |
1724 | max_size = bandwidth * migrate_max_downtime() / 1000000; |
1725 | ||
5b648de0 WY |
1726 | s->mbps = (((double) transferred_bytes * 8.0) / |
1727 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; | |
7e114f8c | 1728 | |
9013dca5 AK |
1729 | trace_migrate_transferred(transferred_bytes, time_spent, |
1730 | bandwidth, max_size); | |
90f8ae72 JQ |
1731 | /* if we haven't sent anything, we don't want to recalculate |
1732 | 10000 is a small enough number for our purposes */ | |
1733 | if (s->dirty_bytes_rate && transferred_bytes > 10000) { | |
1734 | s->expected_downtime = s->dirty_bytes_rate / bandwidth; | |
1735 | } | |
0d82d0e8 | 1736 | |
89a02a9f | 1737 | qemu_file_reset_rate_limit(s->to_dst_file); |
0d82d0e8 | 1738 | initial_time = current_time; |
89a02a9f | 1739 | initial_bytes = qemu_ftell(s->to_dst_file); |
0d82d0e8 | 1740 | } |
89a02a9f | 1741 | if (qemu_file_rate_limit(s->to_dst_file)) { |
0d82d0e8 JQ |
1742 | /* usleep expects microseconds */ |
1743 | g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); | |
1744 | } | |
a3fa1d78 PB |
1745 | } |
1746 | ||
1d34e4bf | 1747 | trace_migration_thread_after_loop(); |
070afca2 JH |
1748 | /* If we enabled cpu throttling for auto-converge, turn it off. */ |
1749 | cpu_throttle_stop(); | |
94f5a437 | 1750 | end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
070afca2 | 1751 | |
f4410a5d | 1752 | qemu_mutex_lock_iothread(); |
ea7415fa | 1753 | qemu_savevm_state_cleanup(); |
31194731 | 1754 | if (s->state == MIGRATION_STATUS_COMPLETED) { |
89a02a9f | 1755 | uint64_t transferred_bytes = qemu_ftell(s->to_dst_file); |
a3fa1d78 | 1756 | s->total_time = end_time - s->total_time; |
1d34e4bf DDAG |
1757 | if (!entered_postcopy) { |
1758 | s->downtime = end_time - start_time; | |
1759 | } | |
d6ed7312 PL |
1760 | if (s->total_time) { |
1761 | s->mbps = (((double) transferred_bytes * 8.0) / | |
1762 | ((double) s->total_time)) / 1000; | |
1763 | } | |
a3fa1d78 PB |
1764 | runstate_set(RUN_STATE_POSTMIGRATE); |
1765 | } else { | |
1d34e4bf | 1766 | if (old_vm_running && !entered_postcopy) { |
a3fa1d78 | 1767 | vm_start(); |
dba433c0 | 1768 | } |
0d82d0e8 | 1769 | } |
bb1fadc4 | 1770 | qemu_bh_schedule(s->cleanup_bh); |
dba433c0 | 1771 | qemu_mutex_unlock_iothread(); |
f4410a5d | 1772 | |
ab28bd23 | 1773 | rcu_unregister_thread(); |
0d82d0e8 JQ |
1774 | return NULL; |
1775 | } | |
1776 | ||
9848a404 | 1777 | void migrate_fd_connect(MigrationState *s) |
0d82d0e8 | 1778 | { |
cc283e3b JQ |
1779 | /* This is a best 1st approximation. ns to ms */ |
1780 | s->expected_downtime = max_downtime/1000000; | |
bb1fadc4 | 1781 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); |
0d82d0e8 | 1782 | |
89a02a9f | 1783 | qemu_file_set_rate_limit(s->to_dst_file, |
442773ce PB |
1784 | s->bandwidth_limit / XFER_LIMIT_RATIO); |
1785 | ||
9287ac27 SH |
1786 | /* Notify before starting migration thread */ |
1787 | notifier_list_notify(&migration_state_notifiers, s); | |
1788 | ||
1d34e4bf DDAG |
1789 | /* |
1790 | * Open the return path; currently for postcopy but other things might | |
1791 | * also want it. | |
1792 | */ | |
1793 | if (migrate_postcopy_ram()) { | |
1794 | if (open_return_path_on_source(s)) { | |
1795 | error_report("Unable to open return-path for postcopy"); | |
48781e5b | 1796 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1d34e4bf DDAG |
1797 | MIGRATION_STATUS_FAILED); |
1798 | migrate_fd_cleanup(s); | |
1799 | return; | |
1800 | } | |
1801 | } | |
1802 | ||
8706d2d5 | 1803 | migrate_compress_threads_create(); |
4900116e | 1804 | qemu_thread_create(&s->thread, "migration", migration_thread, s, |
bb1fadc4 | 1805 | QEMU_THREAD_JOINABLE); |
1d34e4bf | 1806 | s->migration_thread_running = true; |
0d82d0e8 | 1807 | } |
093e3c42 DDAG |
1808 | |
1809 | PostcopyState postcopy_state_get(void) | |
1810 | { | |
1811 | return atomic_mb_read(&incoming_postcopy_state); | |
1812 | } | |
1813 | ||
1814 | /* Set the state and return the old state */ | |
1815 | PostcopyState postcopy_state_set(PostcopyState new_state) | |
1816 | { | |
1817 | return atomic_xchg(&incoming_postcopy_state, new_state); | |
1818 | } | |
1819 |