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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" |
795c40b8 | 19 | #include "migration/blocker.h" |
f4dbe1bf | 20 | #include "exec.h" |
7fcac4a2 | 21 | #include "fd.h" |
61e8b148 | 22 | #include "socket.h" |
e1a3ecee | 23 | #include "rdma.h" |
7b1e1a22 | 24 | #include "ram.h" |
84a899de | 25 | #include "migration/global_state.h" |
c4b63b7c | 26 | #include "migration/misc.h" |
6666c96a | 27 | #include "migration.h" |
20a519a0 | 28 | #include "savevm.h" |
40014d81 | 29 | #include "qemu-file-channel.h" |
08a0aee1 | 30 | #include "qemu-file.h" |
987772d9 | 31 | #include "migration/vmstate.h" |
737e150e | 32 | #include "block/block.h" |
e688df6b | 33 | #include "qapi/error.h" |
9af23989 MA |
34 | #include "qapi/qapi-commands-migration.h" |
35 | #include "qapi/qapi-events-migration.h" | |
cc7a8ea7 | 36 | #include "qapi/qmp/qerror.h" |
15280c36 | 37 | #include "qapi/qmp/qnull.h" |
ab28bd23 | 38 | #include "qemu/rcu.h" |
2c9e6fec | 39 | #include "block.h" |
be07b0ac | 40 | #include "postcopy-ram.h" |
766bd176 | 41 | #include "qemu/thread.h" |
c09e5bb1 | 42 | #include "trace.h" |
51180423 | 43 | #include "exec/target_page.h" |
61b67d47 | 44 | #include "io/channel-buffer.h" |
35a6ed4f | 45 | #include "migration/colo.h" |
4ffdb337 | 46 | #include "hw/boards.h" |
9d18af93 | 47 | #include "monitor/monitor.h" |
065e2813 | 48 | |
dc325627 | 49 | #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ |
5bb7910a | 50 | |
5b4e1eb7 JQ |
51 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled |
52 | * data. */ | |
53 | #define BUFFER_DELAY 100 | |
54 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) | |
55 | ||
2ff30257 AA |
56 | /* Time in milliseconds we are allowed to stop the source, |
57 | * for sending the last part */ | |
58 | #define DEFAULT_MIGRATE_SET_DOWNTIME 300 | |
59 | ||
87c9cc1c DHB |
60 | /* Maximum migrate downtime set to 2000 seconds */ |
61 | #define MAX_MIGRATE_DOWNTIME_SECONDS 2000 | |
62 | #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000) | |
63 | ||
8706d2d5 LL |
64 | /* Default compression thread count */ |
65 | #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 | |
3fcb38c2 LL |
66 | /* Default decompression thread count, usually decompression is at |
67 | * least 4 times as fast as compression.*/ | |
68 | #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 | |
8706d2d5 LL |
69 | /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ |
70 | #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 | |
1626fee3 | 71 | /* Define default autoconverge cpu throttle migration parameters */ |
d85a31d1 JH |
72 | #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20 |
73 | #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10 | |
4cbc9c7f | 74 | #define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99 |
8706d2d5 | 75 | |
17ad9b35 | 76 | /* Migration XBZRLE default cache size */ |
73af8dd8 | 77 | #define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024) |
17ad9b35 | 78 | |
131b2153 ZC |
79 | /* The delay time (in ms) between two COLO checkpoints */ |
80 | #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100) | |
4075fb1c | 81 | #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2 |
0fb86605 | 82 | #define DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT 16 |
68b53591 | 83 | |
7e555c6c DDAG |
84 | /* Background transfer rate for postcopy, 0 means unlimited, note |
85 | * that page requests can still exceed this limit. | |
86 | */ | |
87 | #define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0 | |
88 | ||
99a0db9b GH |
89 | static NotifierList migration_state_notifiers = |
90 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
91 | ||
adde220a DDAG |
92 | static bool deferred_incoming; |
93 | ||
da6f1790 JQ |
94 | /* Messages sent on the return path from destination to source */ |
95 | enum mig_rp_message_type { | |
96 | MIG_RP_MSG_INVALID = 0, /* Must be 0 */ | |
97 | MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */ | |
98 | MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */ | |
99 | ||
100 | MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */ | |
101 | MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */ | |
a335debb | 102 | MIG_RP_MSG_RECV_BITMAP, /* send recved_bitmap back to source */ |
13955b89 | 103 | MIG_RP_MSG_RESUME_ACK, /* tell source that we are ready to resume */ |
da6f1790 JQ |
104 | |
105 | MIG_RP_MSG_MAX | |
106 | }; | |
107 | ||
17549e84 JQ |
108 | /* When we add fault tolerance, we could have several |
109 | migrations at once. For now we don't need to add | |
110 | dynamic creation of migration */ | |
111 | ||
e5cb7e76 | 112 | static MigrationState *current_migration; |
e1b1b1bc | 113 | static MigrationIncomingState *current_incoming; |
e5cb7e76 | 114 | |
8b0b29dc | 115 | static bool migration_object_check(MigrationState *ms, Error **errp); |
0331c8ca DDAG |
116 | static int migration_maybe_pause(MigrationState *s, |
117 | int *current_active_state, | |
118 | int new_state); | |
8b0b29dc | 119 | |
e5cb7e76 PX |
120 | void migration_object_init(void) |
121 | { | |
4ffdb337 | 122 | MachineState *ms = MACHINE(qdev_get_machine()); |
8b0b29dc | 123 | Error *err = NULL; |
4ffdb337 | 124 | |
e5cb7e76 PX |
125 | /* This can only be called once. */ |
126 | assert(!current_migration); | |
127 | current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION)); | |
4ffdb337 | 128 | |
e1b1b1bc PX |
129 | /* |
130 | * Init the migrate incoming object as well no matter whether | |
131 | * we'll use it or not. | |
132 | */ | |
133 | assert(!current_incoming); | |
134 | current_incoming = g_new0(MigrationIncomingState, 1); | |
135 | current_incoming->state = MIGRATION_STATUS_NONE; | |
136 | current_incoming->postcopy_remote_fds = | |
137 | g_array_new(FALSE, TRUE, sizeof(struct PostCopyFD)); | |
138 | qemu_mutex_init(¤t_incoming->rp_mutex); | |
139 | qemu_event_init(¤t_incoming->main_thread_load_event, false); | |
140 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_dst, 0); | |
141 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_fault, 0); | |
142 | ||
143 | init_dirty_bitmap_incoming_migration(); | |
144 | ||
8b0b29dc PX |
145 | if (!migration_object_check(current_migration, &err)) { |
146 | error_report_err(err); | |
147 | exit(1); | |
148 | } | |
149 | ||
4ffdb337 PX |
150 | /* |
151 | * We cannot really do this in migration_instance_init() since at | |
152 | * that time global properties are not yet applied, then this | |
153 | * value will be definitely replaced by something else. | |
154 | */ | |
155 | if (ms->enforce_config_section) { | |
156 | current_migration->send_configuration = true; | |
157 | } | |
e5cb7e76 PX |
158 | } |
159 | ||
1f895604 VSO |
160 | void migration_object_finalize(void) |
161 | { | |
162 | object_unref(OBJECT(current_migration)); | |
163 | } | |
164 | ||
bca7856a | 165 | /* For outgoing */ |
859bc756 | 166 | MigrationState *migrate_get_current(void) |
17549e84 | 167 | { |
e5cb7e76 PX |
168 | /* This can only be called after the object created. */ |
169 | assert(current_migration); | |
170 | return current_migration; | |
17549e84 JQ |
171 | } |
172 | ||
bca7856a DDAG |
173 | MigrationIncomingState *migration_incoming_get_current(void) |
174 | { | |
e1b1b1bc PX |
175 | assert(current_incoming); |
176 | return current_incoming; | |
bca7856a DDAG |
177 | } |
178 | ||
179 | void migration_incoming_state_destroy(void) | |
180 | { | |
b4b076da JQ |
181 | struct MigrationIncomingState *mis = migration_incoming_get_current(); |
182 | ||
3482655b | 183 | if (mis->to_src_file) { |
660819b1 PX |
184 | /* Tell source that we are done */ |
185 | migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0); | |
3482655b PX |
186 | qemu_fclose(mis->to_src_file); |
187 | mis->to_src_file = NULL; | |
188 | } | |
189 | ||
660819b1 PX |
190 | if (mis->from_src_file) { |
191 | qemu_fclose(mis->from_src_file); | |
192 | mis->from_src_file = NULL; | |
193 | } | |
00fa4fc8 DDAG |
194 | if (mis->postcopy_remote_fds) { |
195 | g_array_free(mis->postcopy_remote_fds, TRUE); | |
196 | mis->postcopy_remote_fds = NULL; | |
197 | } | |
660819b1 | 198 | |
5089e186 | 199 | qemu_event_reset(&mis->main_thread_load_event); |
bca7856a DDAG |
200 | } |
201 | ||
b05dc723 JQ |
202 | static void migrate_generate_event(int new_state) |
203 | { | |
204 | if (migrate_use_events()) { | |
3ab72385 | 205 | qapi_event_send_migration(new_state); |
b05dc723 JQ |
206 | } |
207 | } | |
208 | ||
0f073f44 DDAG |
209 | static bool migrate_late_block_activate(void) |
210 | { | |
211 | MigrationState *s; | |
212 | ||
213 | s = migrate_get_current(); | |
214 | ||
215 | return s->enabled_capabilities[ | |
216 | MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE]; | |
217 | } | |
218 | ||
adde220a DDAG |
219 | /* |
220 | * Called on -incoming with a defer: uri. | |
221 | * The migration can be started later after any parameters have been | |
222 | * changed. | |
223 | */ | |
224 | static void deferred_incoming_migration(Error **errp) | |
225 | { | |
226 | if (deferred_incoming) { | |
227 | error_setg(errp, "Incoming migration already deferred"); | |
228 | } | |
229 | deferred_incoming = true; | |
230 | } | |
231 | ||
da6f1790 JQ |
232 | /* |
233 | * Send a message on the return channel back to the source | |
234 | * of the migration. | |
235 | */ | |
d6208e35 PX |
236 | static int migrate_send_rp_message(MigrationIncomingState *mis, |
237 | enum mig_rp_message_type message_type, | |
238 | uint16_t len, void *data) | |
da6f1790 | 239 | { |
d6208e35 PX |
240 | int ret = 0; |
241 | ||
da6f1790 JQ |
242 | trace_migrate_send_rp_message((int)message_type, len); |
243 | qemu_mutex_lock(&mis->rp_mutex); | |
d6208e35 PX |
244 | |
245 | /* | |
246 | * It's possible that the file handle got lost due to network | |
247 | * failures. | |
248 | */ | |
249 | if (!mis->to_src_file) { | |
250 | ret = -EIO; | |
251 | goto error; | |
252 | } | |
253 | ||
da6f1790 JQ |
254 | qemu_put_be16(mis->to_src_file, (unsigned int)message_type); |
255 | qemu_put_be16(mis->to_src_file, len); | |
256 | qemu_put_buffer(mis->to_src_file, data, len); | |
257 | qemu_fflush(mis->to_src_file); | |
d6208e35 PX |
258 | |
259 | /* It's possible that qemu file got error during sending */ | |
260 | ret = qemu_file_get_error(mis->to_src_file); | |
261 | ||
262 | error: | |
da6f1790 | 263 | qemu_mutex_unlock(&mis->rp_mutex); |
d6208e35 | 264 | return ret; |
da6f1790 JQ |
265 | } |
266 | ||
1e2d90eb DDAG |
267 | /* Request a range of pages from the source VM at the given |
268 | * start address. | |
269 | * rbname: Name of the RAMBlock to request the page in, if NULL it's the same | |
270 | * as the last request (a name must have been given previously) | |
271 | * Start: Address offset within the RB | |
272 | * Len: Length in bytes required - must be a multiple of pagesize | |
273 | */ | |
d6208e35 PX |
274 | int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname, |
275 | ram_addr_t start, size_t len) | |
1e2d90eb | 276 | { |
cb8d4c8f | 277 | uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ |
1e2d90eb | 278 | size_t msglen = 12; /* start + len */ |
d6208e35 | 279 | enum mig_rp_message_type msg_type; |
1e2d90eb DDAG |
280 | |
281 | *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); | |
282 | *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); | |
283 | ||
284 | if (rbname) { | |
285 | int rbname_len = strlen(rbname); | |
286 | assert(rbname_len < 256); | |
287 | ||
288 | bufc[msglen++] = rbname_len; | |
289 | memcpy(bufc + msglen, rbname, rbname_len); | |
290 | msglen += rbname_len; | |
d6208e35 | 291 | msg_type = MIG_RP_MSG_REQ_PAGES_ID; |
1e2d90eb | 292 | } else { |
d6208e35 | 293 | msg_type = MIG_RP_MSG_REQ_PAGES; |
1e2d90eb | 294 | } |
d6208e35 PX |
295 | |
296 | return migrate_send_rp_message(mis, msg_type, msglen, bufc); | |
1e2d90eb DDAG |
297 | } |
298 | ||
aad555c2 ZC |
299 | static bool migration_colo_enabled; |
300 | bool migration_incoming_colo_enabled(void) | |
301 | { | |
302 | return migration_colo_enabled; | |
303 | } | |
304 | ||
305 | void migration_incoming_disable_colo(void) | |
306 | { | |
307 | migration_colo_enabled = false; | |
308 | } | |
309 | ||
310 | void migration_incoming_enable_colo(void) | |
311 | { | |
312 | migration_colo_enabled = true; | |
313 | } | |
314 | ||
43eaae28 | 315 | void qemu_start_incoming_migration(const char *uri, Error **errp) |
5bb7910a | 316 | { |
34c9dd8e AL |
317 | const char *p; |
318 | ||
3ab72385 | 319 | qapi_event_send_migration(MIGRATION_STATUS_SETUP); |
adde220a DDAG |
320 | if (!strcmp(uri, "defer")) { |
321 | deferred_incoming_migration(errp); | |
322 | } else if (strstart(uri, "tcp:", &p)) { | |
43eaae28 | 323 | tcp_start_incoming_migration(p, errp); |
2da776db | 324 | #ifdef CONFIG_RDMA |
adde220a | 325 | } else if (strstart(uri, "rdma:", &p)) { |
2da776db MH |
326 | rdma_start_incoming_migration(p, errp); |
327 | #endif | |
adde220a | 328 | } else if (strstart(uri, "exec:", &p)) { |
43eaae28 | 329 | exec_start_incoming_migration(p, errp); |
adde220a | 330 | } else if (strstart(uri, "unix:", &p)) { |
43eaae28 | 331 | unix_start_incoming_migration(p, errp); |
adde220a | 332 | } else if (strstart(uri, "fd:", &p)) { |
43eaae28 | 333 | fd_start_incoming_migration(p, errp); |
adde220a | 334 | } else { |
312fd5f2 | 335 | error_setg(errp, "unknown migration protocol: %s", uri); |
8ca5e801 | 336 | } |
5bb7910a AL |
337 | } |
338 | ||
0aa6aefc DL |
339 | static void process_incoming_migration_bh(void *opaque) |
340 | { | |
341 | Error *local_err = NULL; | |
342 | MigrationIncomingState *mis = opaque; | |
343 | ||
0f073f44 DDAG |
344 | /* If capability late_block_activate is set: |
345 | * Only fire up the block code now if we're going to restart the | |
346 | * VM, else 'cont' will do it. | |
347 | * This causes file locking to happen; so we don't want it to happen | |
348 | * unless we really are starting the VM. | |
349 | */ | |
350 | if (!migrate_late_block_activate() || | |
351 | (autostart && (!global_state_received() || | |
352 | global_state_get_runstate() == RUN_STATE_RUNNING))) { | |
353 | /* Make sure all file formats flush their mutable metadata. | |
354 | * If we get an error here, just don't restart the VM yet. */ | |
355 | bdrv_invalidate_cache_all(&local_err); | |
356 | if (local_err) { | |
357 | error_report_err(local_err); | |
358 | local_err = NULL; | |
359 | autostart = false; | |
360 | } | |
d35ff5e6 KW |
361 | } |
362 | ||
0aa6aefc DL |
363 | /* |
364 | * This must happen after all error conditions are dealt with and | |
365 | * we're sure the VM is going to be running on this host. | |
366 | */ | |
367 | qemu_announce_self(); | |
368 | ||
f986c3d2 JQ |
369 | if (multifd_load_cleanup(&local_err) != 0) { |
370 | error_report_err(local_err); | |
371 | autostart = false; | |
372 | } | |
0aa6aefc DL |
373 | /* If global state section was not received or we are in running |
374 | state, we need to obey autostart. Any other state is set with | |
375 | runstate_set. */ | |
376 | ||
b35ebdf0 VSO |
377 | dirty_bitmap_mig_before_vm_start(); |
378 | ||
0aa6aefc DL |
379 | if (!global_state_received() || |
380 | global_state_get_runstate() == RUN_STATE_RUNNING) { | |
381 | if (autostart) { | |
382 | vm_start(); | |
383 | } else { | |
384 | runstate_set(RUN_STATE_PAUSED); | |
385 | } | |
386 | } else { | |
387 | runstate_set(global_state_get_runstate()); | |
388 | } | |
0aa6aefc DL |
389 | /* |
390 | * This must happen after any state changes since as soon as an external | |
391 | * observer sees this event they might start to prod at the VM assuming | |
392 | * it's ready to use. | |
393 | */ | |
394 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
395 | MIGRATION_STATUS_COMPLETED); | |
396 | qemu_bh_delete(mis->bh); | |
397 | migration_incoming_state_destroy(); | |
398 | } | |
399 | ||
82a4da79 | 400 | static void process_incoming_migration_co(void *opaque) |
511c0231 | 401 | { |
b4b076da | 402 | MigrationIncomingState *mis = migration_incoming_get_current(); |
e9bef235 | 403 | PostcopyState ps; |
1c12e1f5 | 404 | int ret; |
8e48ac95 | 405 | Error *local_err = NULL; |
1c12e1f5 | 406 | |
4f0fae7f | 407 | assert(mis->from_src_file); |
92370989 | 408 | mis->migration_incoming_co = qemu_coroutine_self(); |
67f11b5c | 409 | mis->largest_page_size = qemu_ram_pagesize_largest(); |
093e3c42 | 410 | postcopy_state_set(POSTCOPY_INCOMING_NONE); |
93d7af6f HZ |
411 | migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, |
412 | MIGRATION_STATUS_ACTIVE); | |
4f0fae7f | 413 | ret = qemu_loadvm_state(mis->from_src_file); |
bca7856a | 414 | |
e9bef235 DDAG |
415 | ps = postcopy_state_get(); |
416 | trace_process_incoming_migration_co_end(ret, ps); | |
417 | if (ps != POSTCOPY_INCOMING_NONE) { | |
418 | if (ps == POSTCOPY_INCOMING_ADVISE) { | |
419 | /* | |
420 | * Where a migration had postcopy enabled (and thus went to advise) | |
421 | * but managed to complete within the precopy period, we can use | |
422 | * the normal exit. | |
423 | */ | |
424 | postcopy_ram_incoming_cleanup(mis); | |
425 | } else if (ret >= 0) { | |
426 | /* | |
427 | * Postcopy was started, cleanup should happen at the end of the | |
428 | * postcopy thread. | |
429 | */ | |
430 | trace_process_incoming_migration_co_postcopy_end_main(); | |
431 | return; | |
432 | } | |
433 | /* Else if something went wrong then just fall out of the normal exit */ | |
434 | } | |
435 | ||
25d0c16f | 436 | /* we get COLO info, and know if we are in COLO mode */ |
aad555c2 | 437 | if (!ret && migration_incoming_colo_enabled()) { |
8e48ac95 ZC |
438 | /* Make sure all file formats flush their mutable metadata */ |
439 | bdrv_invalidate_cache_all(&local_err); | |
440 | if (local_err) { | |
8e48ac95 | 441 | error_report_err(local_err); |
6d99c2d4 | 442 | goto fail; |
8e48ac95 ZC |
443 | } |
444 | ||
13af18f2 ZC |
445 | if (colo_init_ram_cache() < 0) { |
446 | error_report("Init ram cache failed"); | |
6d99c2d4 | 447 | goto fail; |
13af18f2 ZC |
448 | } |
449 | ||
25d0c16f HZ |
450 | qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming", |
451 | colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE); | |
452 | mis->have_colo_incoming_thread = true; | |
453 | qemu_coroutine_yield(); | |
454 | ||
455 | /* Wait checkpoint incoming thread exit before free resource */ | |
456 | qemu_thread_join(&mis->colo_incoming_thread); | |
13af18f2 ZC |
457 | /* We hold the global iothread lock, so it is safe here */ |
458 | colo_release_ram_cache(); | |
25d0c16f HZ |
459 | } |
460 | ||
1c12e1f5 | 461 | if (ret < 0) { |
db80face | 462 | error_report("load of migration failed: %s", strerror(-ret)); |
6d99c2d4 | 463 | goto fail; |
511c0231 | 464 | } |
0aa6aefc DL |
465 | mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); |
466 | qemu_bh_schedule(mis->bh); | |
92370989 | 467 | mis->migration_incoming_co = NULL; |
6d99c2d4 FL |
468 | return; |
469 | fail: | |
470 | local_err = NULL; | |
471 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
472 | MIGRATION_STATUS_FAILED); | |
473 | qemu_fclose(mis->from_src_file); | |
474 | if (multifd_load_cleanup(&local_err) != 0) { | |
475 | error_report_err(local_err); | |
476 | } | |
477 | exit(EXIT_FAILURE); | |
511c0231 JQ |
478 | } |
479 | ||
e595a01a | 480 | static void migration_incoming_setup(QEMUFile *f) |
82a4da79 | 481 | { |
4f0fae7f | 482 | MigrationIncomingState *mis = migration_incoming_get_current(); |
82a4da79 | 483 | |
f986c3d2 JQ |
484 | if (multifd_load_setup() != 0) { |
485 | /* We haven't been able to create multifd threads | |
486 | nothing better to do */ | |
487 | exit(EXIT_FAILURE); | |
488 | } | |
489 | ||
4f0fae7f JQ |
490 | if (!mis->from_src_file) { |
491 | mis->from_src_file = f; | |
492 | } | |
06ad5135 | 493 | qemu_file_set_blocking(f, false); |
e595a01a JQ |
494 | } |
495 | ||
36c2f8be | 496 | void migration_incoming_process(void) |
e595a01a JQ |
497 | { |
498 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL); | |
0b8b8753 | 499 | qemu_coroutine_enter(co); |
82a4da79 PB |
500 | } |
501 | ||
884835fa PX |
502 | /* Returns true if recovered from a paused migration, otherwise false */ |
503 | static bool postcopy_try_recover(QEMUFile *f) | |
e595a01a | 504 | { |
d96c9e8d PX |
505 | MigrationIncomingState *mis = migration_incoming_get_current(); |
506 | ||
507 | if (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
508 | /* Resumed from a paused postcopy migration */ | |
509 | ||
510 | mis->from_src_file = f; | |
511 | /* Postcopy has standalone thread to do vm load */ | |
512 | qemu_file_set_blocking(f, true); | |
513 | ||
514 | /* Re-configure the return path */ | |
515 | mis->to_src_file = qemu_file_get_return_path(f); | |
516 | ||
517 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_PAUSED, | |
518 | MIGRATION_STATUS_POSTCOPY_RECOVER); | |
519 | ||
520 | /* | |
521 | * Here, we only wake up the main loading thread (while the | |
522 | * fault thread will still be waiting), so that we can receive | |
523 | * commands from source now, and answer it if needed. The | |
524 | * fault thread will be woken up afterwards until we are sure | |
525 | * that source is ready to reply to page requests. | |
526 | */ | |
527 | qemu_sem_post(&mis->postcopy_pause_sem_dst); | |
884835fa PX |
528 | return true; |
529 | } | |
530 | ||
531 | return false; | |
532 | } | |
533 | ||
534 | void migration_fd_process_incoming(QEMUFile *f) | |
535 | { | |
536 | if (postcopy_try_recover(f)) { | |
537 | return; | |
d96c9e8d | 538 | } |
884835fa PX |
539 | |
540 | migration_incoming_setup(f); | |
541 | migration_incoming_process(); | |
e595a01a JQ |
542 | } |
543 | ||
49ed0d24 | 544 | void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp) |
4f0fae7f JQ |
545 | { |
546 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
a429e7f4 | 547 | bool start_migration; |
4f0fae7f JQ |
548 | |
549 | if (!mis->from_src_file) { | |
a429e7f4 | 550 | /* The first connection (multifd may have multiple) */ |
4f0fae7f | 551 | QEMUFile *f = qemu_fopen_channel_input(ioc); |
a429e7f4 PX |
552 | |
553 | /* If it's a recovery, we're done */ | |
884835fa PX |
554 | if (postcopy_try_recover(f)) { |
555 | return; | |
556 | } | |
a429e7f4 | 557 | |
36c2f8be | 558 | migration_incoming_setup(f); |
a429e7f4 PX |
559 | |
560 | /* | |
561 | * Common migration only needs one channel, so we can start | |
562 | * right now. Multifd needs more than one channel, we wait. | |
563 | */ | |
564 | start_migration = !migrate_use_multifd(); | |
565 | } else { | |
49ed0d24 | 566 | Error *local_err = NULL; |
a429e7f4 PX |
567 | /* Multiple connections */ |
568 | assert(migrate_use_multifd()); | |
49ed0d24 FL |
569 | start_migration = multifd_recv_new_channel(ioc, &local_err); |
570 | if (local_err) { | |
571 | error_propagate(errp, local_err); | |
572 | return; | |
573 | } | |
4f0fae7f | 574 | } |
81e62053 | 575 | |
a429e7f4 | 576 | if (start_migration) { |
81e62053 PX |
577 | migration_incoming_process(); |
578 | } | |
4f0fae7f JQ |
579 | } |
580 | ||
428d8908 JQ |
581 | /** |
582 | * @migration_has_all_channels: We have received all channels that we need | |
583 | * | |
584 | * Returns true when we have got connections to all the channels that | |
585 | * we need for migration. | |
586 | */ | |
587 | bool migration_has_all_channels(void) | |
588 | { | |
ca273df3 | 589 | MigrationIncomingState *mis = migration_incoming_get_current(); |
62c1e0ca JQ |
590 | bool all_channels; |
591 | ||
592 | all_channels = multifd_recv_all_channels_created(); | |
593 | ||
ca273df3 | 594 | return all_channels && mis->from_src_file != NULL; |
428d8908 JQ |
595 | } |
596 | ||
6decec93 DDAG |
597 | /* |
598 | * Send a 'SHUT' message on the return channel with the given value | |
599 | * to indicate that we've finished with the RP. Non-0 value indicates | |
600 | * error. | |
601 | */ | |
602 | void migrate_send_rp_shut(MigrationIncomingState *mis, | |
603 | uint32_t value) | |
604 | { | |
605 | uint32_t buf; | |
606 | ||
607 | buf = cpu_to_be32(value); | |
608 | migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); | |
609 | } | |
610 | ||
611 | /* | |
612 | * Send a 'PONG' message on the return channel with the given value | |
613 | * (normally in response to a 'PING') | |
614 | */ | |
615 | void migrate_send_rp_pong(MigrationIncomingState *mis, | |
616 | uint32_t value) | |
617 | { | |
618 | uint32_t buf; | |
619 | ||
620 | buf = cpu_to_be32(value); | |
621 | migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); | |
622 | } | |
623 | ||
a335debb PX |
624 | void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis, |
625 | char *block_name) | |
626 | { | |
627 | char buf[512]; | |
628 | int len; | |
629 | int64_t res; | |
630 | ||
631 | /* | |
632 | * First, we send the header part. It contains only the len of | |
633 | * idstr, and the idstr itself. | |
634 | */ | |
635 | len = strlen(block_name); | |
636 | buf[0] = len; | |
637 | memcpy(buf + 1, block_name, len); | |
638 | ||
639 | if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
640 | error_report("%s: MSG_RP_RECV_BITMAP only used for recovery", | |
641 | __func__); | |
642 | return; | |
643 | } | |
644 | ||
645 | migrate_send_rp_message(mis, MIG_RP_MSG_RECV_BITMAP, len + 1, buf); | |
646 | ||
647 | /* | |
648 | * Next, we dump the received bitmap to the stream. | |
649 | * | |
650 | * TODO: currently we are safe since we are the only one that is | |
651 | * using the to_src_file handle (fault thread is still paused), | |
652 | * and it's ok even not taking the mutex. However the best way is | |
653 | * to take the lock before sending the message header, and release | |
654 | * the lock after sending the bitmap. | |
655 | */ | |
656 | qemu_mutex_lock(&mis->rp_mutex); | |
657 | res = ramblock_recv_bitmap_send(mis->to_src_file, block_name); | |
658 | qemu_mutex_unlock(&mis->rp_mutex); | |
659 | ||
660 | trace_migrate_send_rp_recv_bitmap(block_name, res); | |
661 | } | |
662 | ||
13955b89 PX |
663 | void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value) |
664 | { | |
665 | uint32_t buf; | |
666 | ||
667 | buf = cpu_to_be32(value); | |
668 | migrate_send_rp_message(mis, MIG_RP_MSG_RESUME_ACK, sizeof(buf), &buf); | |
669 | } | |
670 | ||
bbf6da32 OW |
671 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) |
672 | { | |
673 | MigrationCapabilityStatusList *head = NULL; | |
674 | MigrationCapabilityStatusList *caps; | |
675 | MigrationState *s = migrate_get_current(); | |
676 | int i; | |
677 | ||
387eedeb | 678 | caps = NULL; /* silence compiler warning */ |
7fb1cf16 | 679 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { |
ed1701c6 DDAG |
680 | #ifndef CONFIG_LIVE_BLOCK_MIGRATION |
681 | if (i == MIGRATION_CAPABILITY_BLOCK) { | |
682 | continue; | |
683 | } | |
684 | #endif | |
bbf6da32 OW |
685 | if (head == NULL) { |
686 | head = g_malloc0(sizeof(*caps)); | |
687 | caps = head; | |
688 | } else { | |
689 | caps->next = g_malloc0(sizeof(*caps)); | |
690 | caps = caps->next; | |
691 | } | |
692 | caps->value = | |
693 | g_malloc(sizeof(*caps->value)); | |
694 | caps->value->capability = i; | |
695 | caps->value->state = s->enabled_capabilities[i]; | |
696 | } | |
697 | ||
698 | return head; | |
699 | } | |
700 | ||
85de8323 LL |
701 | MigrationParameters *qmp_query_migrate_parameters(Error **errp) |
702 | { | |
703 | MigrationParameters *params; | |
704 | MigrationState *s = migrate_get_current(); | |
705 | ||
e87fae4c | 706 | /* TODO use QAPI_CLONE() instead of duplicating it inline */ |
85de8323 | 707 | params = g_malloc0(sizeof(*params)); |
de63ab61 | 708 | params->has_compress_level = true; |
2594f56d | 709 | params->compress_level = s->parameters.compress_level; |
de63ab61 | 710 | params->has_compress_threads = true; |
2594f56d | 711 | params->compress_threads = s->parameters.compress_threads; |
1d58872a XG |
712 | params->has_compress_wait_thread = true; |
713 | params->compress_wait_thread = s->parameters.compress_wait_thread; | |
de63ab61 | 714 | params->has_decompress_threads = true; |
2594f56d | 715 | params->decompress_threads = s->parameters.decompress_threads; |
de63ab61 | 716 | params->has_cpu_throttle_initial = true; |
2594f56d | 717 | params->cpu_throttle_initial = s->parameters.cpu_throttle_initial; |
de63ab61 | 718 | params->has_cpu_throttle_increment = true; |
2594f56d | 719 | params->cpu_throttle_increment = s->parameters.cpu_throttle_increment; |
8cc99dcd | 720 | params->has_tls_creds = true; |
69ef1f36 | 721 | params->tls_creds = g_strdup(s->parameters.tls_creds); |
8cc99dcd | 722 | params->has_tls_hostname = true; |
69ef1f36 | 723 | params->tls_hostname = g_strdup(s->parameters.tls_hostname); |
2ff30257 AA |
724 | params->has_max_bandwidth = true; |
725 | params->max_bandwidth = s->parameters.max_bandwidth; | |
726 | params->has_downtime_limit = true; | |
727 | params->downtime_limit = s->parameters.downtime_limit; | |
fe39a4d4 | 728 | params->has_x_checkpoint_delay = true; |
68b53591 | 729 | params->x_checkpoint_delay = s->parameters.x_checkpoint_delay; |
2833c59b JQ |
730 | params->has_block_incremental = true; |
731 | params->block_incremental = s->parameters.block_incremental; | |
4075fb1c JQ |
732 | params->has_x_multifd_channels = true; |
733 | params->x_multifd_channels = s->parameters.x_multifd_channels; | |
0fb86605 JQ |
734 | params->has_x_multifd_page_count = true; |
735 | params->x_multifd_page_count = s->parameters.x_multifd_page_count; | |
73af8dd8 JQ |
736 | params->has_xbzrle_cache_size = true; |
737 | params->xbzrle_cache_size = s->parameters.xbzrle_cache_size; | |
7e555c6c DDAG |
738 | params->has_max_postcopy_bandwidth = true; |
739 | params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth; | |
4cbc9c7f LQ |
740 | params->has_max_cpu_throttle = true; |
741 | params->max_cpu_throttle = s->parameters.max_cpu_throttle; | |
85de8323 LL |
742 | |
743 | return params; | |
744 | } | |
745 | ||
f6844b99 DDAG |
746 | /* |
747 | * Return true if we're already in the middle of a migration | |
748 | * (i.e. any of the active or setup states) | |
749 | */ | |
3d63da16 | 750 | bool migration_is_setup_or_active(int state) |
f6844b99 DDAG |
751 | { |
752 | switch (state) { | |
753 | case MIGRATION_STATUS_ACTIVE: | |
9ec055ae | 754 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
a688d2c1 | 755 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
135b87b4 | 756 | case MIGRATION_STATUS_POSTCOPY_RECOVER: |
f6844b99 | 757 | case MIGRATION_STATUS_SETUP: |
31e06077 DDAG |
758 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
759 | case MIGRATION_STATUS_DEVICE: | |
f6844b99 DDAG |
760 | return true; |
761 | ||
762 | default: | |
763 | return false; | |
764 | ||
765 | } | |
766 | } | |
767 | ||
a22463a5 DDAG |
768 | static void populate_ram_info(MigrationInfo *info, MigrationState *s) |
769 | { | |
770 | info->has_ram = true; | |
771 | info->ram = g_malloc0(sizeof(*info->ram)); | |
9360447d | 772 | info->ram->transferred = ram_counters.transferred; |
a22463a5 | 773 | info->ram->total = ram_bytes_total(); |
9360447d | 774 | info->ram->duplicate = ram_counters.duplicate; |
bedf53c1 JQ |
775 | /* legacy value. It is not used anymore */ |
776 | info->ram->skipped = 0; | |
9360447d JQ |
777 | info->ram->normal = ram_counters.normal; |
778 | info->ram->normal_bytes = ram_counters.normal * | |
20afaed9 | 779 | qemu_target_page_size(); |
a22463a5 | 780 | info->ram->mbps = s->mbps; |
9360447d JQ |
781 | info->ram->dirty_sync_count = ram_counters.dirty_sync_count; |
782 | info->ram->postcopy_requests = ram_counters.postcopy_requests; | |
030ce1f8 | 783 | info->ram->page_size = qemu_target_page_size(); |
a61c45bd | 784 | info->ram->multifd_bytes = ram_counters.multifd_bytes; |
a22463a5 | 785 | |
114f5aee JQ |
786 | if (migrate_use_xbzrle()) { |
787 | info->has_xbzrle_cache = true; | |
788 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); | |
789 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
9360447d JQ |
790 | info->xbzrle_cache->bytes = xbzrle_counters.bytes; |
791 | info->xbzrle_cache->pages = xbzrle_counters.pages; | |
792 | info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss; | |
793 | info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate; | |
794 | info->xbzrle_cache->overflow = xbzrle_counters.overflow; | |
114f5aee JQ |
795 | } |
796 | ||
76e03000 XG |
797 | if (migrate_use_compression()) { |
798 | info->has_compression = true; | |
799 | info->compression = g_malloc0(sizeof(*info->compression)); | |
800 | info->compression->pages = compression_counters.pages; | |
801 | info->compression->busy = compression_counters.busy; | |
802 | info->compression->busy_rate = compression_counters.busy_rate; | |
803 | info->compression->compressed_size = | |
804 | compression_counters.compressed_size; | |
805 | info->compression->compression_rate = | |
806 | compression_counters.compression_rate; | |
807 | } | |
808 | ||
338182c8 JQ |
809 | if (cpu_throttle_active()) { |
810 | info->has_cpu_throttle_percentage = true; | |
811 | info->cpu_throttle_percentage = cpu_throttle_get_percentage(); | |
812 | } | |
813 | ||
a22463a5 DDAG |
814 | if (s->state != MIGRATION_STATUS_COMPLETED) { |
815 | info->ram->remaining = ram_bytes_remaining(); | |
9360447d | 816 | info->ram->dirty_pages_rate = ram_counters.dirty_pages_rate; |
a22463a5 DDAG |
817 | } |
818 | } | |
819 | ||
930ac04c JQ |
820 | static void populate_disk_info(MigrationInfo *info) |
821 | { | |
822 | if (blk_mig_active()) { | |
823 | info->has_disk = true; | |
824 | info->disk = g_malloc0(sizeof(*info->disk)); | |
825 | info->disk->transferred = blk_mig_bytes_transferred(); | |
826 | info->disk->remaining = blk_mig_bytes_remaining(); | |
827 | info->disk->total = blk_mig_bytes_total(); | |
828 | } | |
829 | } | |
830 | ||
65ace060 | 831 | static void fill_source_migration_info(MigrationInfo *info) |
5bb7910a | 832 | { |
17549e84 JQ |
833 | MigrationState *s = migrate_get_current(); |
834 | ||
835 | switch (s->state) { | |
31194731 | 836 | case MIGRATION_STATUS_NONE: |
17549e84 | 837 | /* no migration has happened ever */ |
65ace060 AP |
838 | /* do not overwrite destination migration status */ |
839 | return; | |
17549e84 | 840 | break; |
31194731 | 841 | case MIGRATION_STATUS_SETUP: |
29ae8a41 | 842 | info->has_status = true; |
ed4fbd10 | 843 | info->has_total_time = false; |
29ae8a41 | 844 | break; |
31194731 HZ |
845 | case MIGRATION_STATUS_ACTIVE: |
846 | case MIGRATION_STATUS_CANCELLING: | |
9ec055ae | 847 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
31e06077 DDAG |
848 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
849 | case MIGRATION_STATUS_DEVICE: | |
a688d2c1 | 850 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
135b87b4 | 851 | case MIGRATION_STATUS_POSTCOPY_RECOVER: |
c8f9f4f4 | 852 | /* TODO add some postcopy stats */ |
9ec055ae DDAG |
853 | info->has_status = true; |
854 | info->has_total_time = true; | |
855 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) | |
4af246a3 | 856 | - s->start_time; |
9ec055ae DDAG |
857 | info->has_expected_downtime = true; |
858 | info->expected_downtime = s->expected_downtime; | |
859 | info->has_setup_time = true; | |
860 | info->setup_time = s->setup_time; | |
861 | ||
a22463a5 | 862 | populate_ram_info(info, s); |
930ac04c | 863 | populate_disk_info(info); |
17549e84 | 864 | break; |
0b827d5e HZ |
865 | case MIGRATION_STATUS_COLO: |
866 | info->has_status = true; | |
867 | /* TODO: display COLO specific information (checkpoint info etc.) */ | |
868 | break; | |
31194731 | 869 | case MIGRATION_STATUS_COMPLETED: |
791e7c82 | 870 | info->has_status = true; |
00c14997 | 871 | info->has_total_time = true; |
7aa939af | 872 | info->total_time = s->total_time; |
9c5a9fcf JQ |
873 | info->has_downtime = true; |
874 | info->downtime = s->downtime; | |
ed4fbd10 MH |
875 | info->has_setup_time = true; |
876 | info->setup_time = s->setup_time; | |
d5f8a570 | 877 | |
a22463a5 | 878 | populate_ram_info(info, s); |
17549e84 | 879 | break; |
31194731 | 880 | case MIGRATION_STATUS_FAILED: |
791e7c82 | 881 | info->has_status = true; |
d59ce6f3 DB |
882 | if (s->error) { |
883 | info->has_error_desc = true; | |
884 | info->error_desc = g_strdup(error_get_pretty(s->error)); | |
885 | } | |
17549e84 | 886 | break; |
31194731 | 887 | case MIGRATION_STATUS_CANCELLED: |
791e7c82 | 888 | info->has_status = true; |
17549e84 | 889 | break; |
5bb7910a | 890 | } |
cde63fbe | 891 | info->status = s->state; |
5bb7910a AL |
892 | } |
893 | ||
4a84214e PX |
894 | /** |
895 | * @migration_caps_check - check capability validity | |
896 | * | |
897 | * @cap_list: old capability list, array of bool | |
898 | * @params: new capabilities to be applied soon | |
899 | * @errp: set *errp if the check failed, with reason | |
900 | * | |
901 | * Returns true if check passed, otherwise false. | |
902 | */ | |
903 | static bool migrate_caps_check(bool *cap_list, | |
904 | MigrationCapabilityStatusList *params, | |
905 | Error **errp) | |
00458433 | 906 | { |
00458433 | 907 | MigrationCapabilityStatusList *cap; |
4a84214e | 908 | bool old_postcopy_cap; |
d7651f15 | 909 | MigrationIncomingState *mis = migration_incoming_get_current(); |
00458433 | 910 | |
4a84214e | 911 | old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]; |
00458433 OW |
912 | |
913 | for (cap = params; cap; cap = cap->next) { | |
4a84214e PX |
914 | cap_list[cap->value->capability] = cap->value->state; |
915 | } | |
916 | ||
ed1701c6 | 917 | #ifndef CONFIG_LIVE_BLOCK_MIGRATION |
4a84214e PX |
918 | if (cap_list[MIGRATION_CAPABILITY_BLOCK]) { |
919 | error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) " | |
920 | "block migration"); | |
921 | error_append_hint(errp, "Use drive_mirror+NBD instead.\n"); | |
922 | return false; | |
00458433 | 923 | } |
4a84214e | 924 | #endif |
53dd370c | 925 | |
7e934f5b ZC |
926 | #ifndef CONFIG_REPLICATION |
927 | if (cap_list[MIGRATION_CAPABILITY_X_COLO]) { | |
928 | error_setg(errp, "QEMU compiled without replication module" | |
929 | " can't enable COLO"); | |
930 | error_append_hint(errp, "Please enable replication before COLO.\n"); | |
931 | return false; | |
932 | } | |
933 | #endif | |
934 | ||
4a84214e PX |
935 | if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) { |
936 | if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) { | |
53dd370c DDAG |
937 | /* The decompression threads asynchronously write into RAM |
938 | * rather than use the atomic copies needed to avoid | |
939 | * userfaulting. It should be possible to fix the decompression | |
940 | * threads for compatibility in future. | |
941 | */ | |
4a84214e PX |
942 | error_setg(errp, "Postcopy is not currently compatible " |
943 | "with compression"); | |
944 | return false; | |
53dd370c | 945 | } |
4a84214e | 946 | |
096631bd DDAG |
947 | /* This check is reasonably expensive, so only when it's being |
948 | * set the first time, also it's only the destination that needs | |
949 | * special support. | |
950 | */ | |
951 | if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) && | |
d7651f15 | 952 | !postcopy_ram_supported_by_host(mis)) { |
096631bd DDAG |
953 | /* postcopy_ram_supported_by_host will have emitted a more |
954 | * detailed message | |
955 | */ | |
4a84214e PX |
956 | error_setg(errp, "Postcopy is not supported"); |
957 | return false; | |
096631bd | 958 | } |
53dd370c | 959 | } |
4a84214e PX |
960 | |
961 | return true; | |
962 | } | |
963 | ||
65ace060 AP |
964 | static void fill_destination_migration_info(MigrationInfo *info) |
965 | { | |
966 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
967 | ||
968 | switch (mis->state) { | |
969 | case MIGRATION_STATUS_NONE: | |
970 | return; | |
971 | break; | |
972 | case MIGRATION_STATUS_SETUP: | |
973 | case MIGRATION_STATUS_CANCELLING: | |
974 | case MIGRATION_STATUS_CANCELLED: | |
975 | case MIGRATION_STATUS_ACTIVE: | |
976 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
3c9928d9 PX |
977 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
978 | case MIGRATION_STATUS_POSTCOPY_RECOVER: | |
65ace060 AP |
979 | case MIGRATION_STATUS_FAILED: |
980 | case MIGRATION_STATUS_COLO: | |
981 | info->has_status = true; | |
982 | break; | |
983 | case MIGRATION_STATUS_COMPLETED: | |
984 | info->has_status = true; | |
985 | fill_destination_postcopy_migration_info(info); | |
986 | break; | |
987 | } | |
988 | info->status = mis->state; | |
989 | } | |
990 | ||
991 | MigrationInfo *qmp_query_migrate(Error **errp) | |
992 | { | |
993 | MigrationInfo *info = g_malloc0(sizeof(*info)); | |
994 | ||
995 | fill_destination_migration_info(info); | |
996 | fill_source_migration_info(info); | |
997 | ||
998 | return info; | |
999 | } | |
1000 | ||
4a84214e PX |
1001 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, |
1002 | Error **errp) | |
1003 | { | |
1004 | MigrationState *s = migrate_get_current(); | |
1005 | MigrationCapabilityStatusList *cap; | |
dd0ee30c | 1006 | bool cap_list[MIGRATION_CAPABILITY__MAX]; |
4a84214e PX |
1007 | |
1008 | if (migration_is_setup_or_active(s->state)) { | |
1009 | error_setg(errp, QERR_MIGRATION_ACTIVE); | |
1010 | return; | |
1011 | } | |
1012 | ||
dd0ee30c PX |
1013 | memcpy(cap_list, s->enabled_capabilities, sizeof(cap_list)); |
1014 | if (!migrate_caps_check(cap_list, params, errp)) { | |
4a84214e PX |
1015 | return; |
1016 | } | |
1017 | ||
1018 | for (cap = params; cap; cap = cap->next) { | |
1019 | s->enabled_capabilities[cap->value->capability] = cap->value->state; | |
1020 | } | |
00458433 OW |
1021 | } |
1022 | ||
16d063bc PX |
1023 | /* |
1024 | * Check whether the parameters are valid. Error will be put into errp | |
1025 | * (if provided). Return true if valid, otherwise false. | |
1026 | */ | |
1027 | static bool migrate_params_check(MigrationParameters *params, Error **errp) | |
85de8323 | 1028 | { |
7f375e04 | 1029 | if (params->has_compress_level && |
741d4086 | 1030 | (params->compress_level > 9)) { |
c6bd8c70 MA |
1031 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level", |
1032 | "is invalid, it should be in the range of 0 to 9"); | |
16d063bc | 1033 | return false; |
85de8323 | 1034 | } |
16d063bc | 1035 | |
741d4086 | 1036 | if (params->has_compress_threads && (params->compress_threads < 1)) { |
c6bd8c70 MA |
1037 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1038 | "compress_threads", | |
1039 | "is invalid, it should be in the range of 1 to 255"); | |
16d063bc | 1040 | return false; |
85de8323 | 1041 | } |
16d063bc | 1042 | |
741d4086 | 1043 | if (params->has_decompress_threads && (params->decompress_threads < 1)) { |
c6bd8c70 MA |
1044 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1045 | "decompress_threads", | |
1046 | "is invalid, it should be in the range of 1 to 255"); | |
16d063bc | 1047 | return false; |
85de8323 | 1048 | } |
16d063bc | 1049 | |
7f375e04 EB |
1050 | if (params->has_cpu_throttle_initial && |
1051 | (params->cpu_throttle_initial < 1 || | |
1052 | params->cpu_throttle_initial > 99)) { | |
1626fee3 | 1053 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
d85a31d1 | 1054 | "cpu_throttle_initial", |
1626fee3 | 1055 | "an integer in the range of 1 to 99"); |
16d063bc | 1056 | return false; |
1626fee3 | 1057 | } |
16d063bc | 1058 | |
7f375e04 EB |
1059 | if (params->has_cpu_throttle_increment && |
1060 | (params->cpu_throttle_increment < 1 || | |
1061 | params->cpu_throttle_increment > 99)) { | |
1626fee3 | 1062 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
d85a31d1 | 1063 | "cpu_throttle_increment", |
1626fee3 | 1064 | "an integer in the range of 1 to 99"); |
16d063bc | 1065 | return false; |
1626fee3 | 1066 | } |
16d063bc | 1067 | |
741d4086 | 1068 | if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) { |
2ff30257 AA |
1069 | error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the" |
1070 | " range of 0 to %zu bytes/second", SIZE_MAX); | |
16d063bc | 1071 | return false; |
2ff30257 | 1072 | } |
16d063bc | 1073 | |
2ff30257 | 1074 | if (params->has_downtime_limit && |
741d4086 | 1075 | (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) { |
87c9cc1c DHB |
1076 | error_setg(errp, "Parameter 'downtime_limit' expects an integer in " |
1077 | "the range of 0 to %d milliseconds", | |
1078 | MAX_MIGRATE_DOWNTIME); | |
16d063bc | 1079 | return false; |
2ff30257 | 1080 | } |
16d063bc | 1081 | |
741d4086 JQ |
1082 | /* x_checkpoint_delay is now always positive */ |
1083 | ||
1084 | if (params->has_x_multifd_channels && (params->x_multifd_channels < 1)) { | |
4075fb1c JQ |
1085 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1086 | "multifd_channels", | |
1087 | "is invalid, it should be in the range of 1 to 255"); | |
1088 | return false; | |
1089 | } | |
0fb86605 | 1090 | if (params->has_x_multifd_page_count && |
741d4086 JQ |
1091 | (params->x_multifd_page_count < 1 || |
1092 | params->x_multifd_page_count > 10000)) { | |
0fb86605 JQ |
1093 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1094 | "multifd_page_count", | |
1095 | "is invalid, it should be in the range of 1 to 10000"); | |
1096 | return false; | |
1097 | } | |
16d063bc | 1098 | |
73af8dd8 JQ |
1099 | if (params->has_xbzrle_cache_size && |
1100 | (params->xbzrle_cache_size < qemu_target_page_size() || | |
1101 | !is_power_of_2(params->xbzrle_cache_size))) { | |
1102 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
1103 | "xbzrle_cache_size", | |
1104 | "is invalid, it should be bigger than target page size" | |
1105 | " and a power of two"); | |
1106 | return false; | |
1107 | } | |
1108 | ||
4cbc9c7f LQ |
1109 | if (params->has_max_cpu_throttle && |
1110 | (params->max_cpu_throttle < params->cpu_throttle_initial || | |
1111 | params->max_cpu_throttle > 99)) { | |
1112 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, | |
1113 | "max_cpu_throttle", | |
1114 | "an integer in the range of cpu_throttle_initial to 99"); | |
1115 | return false; | |
1116 | } | |
1117 | ||
16d063bc PX |
1118 | return true; |
1119 | } | |
1120 | ||
1bda8b3c MA |
1121 | static void migrate_params_test_apply(MigrateSetParameters *params, |
1122 | MigrationParameters *dest) | |
1123 | { | |
1124 | *dest = migrate_get_current()->parameters; | |
1125 | ||
1126 | /* TODO use QAPI_CLONE() instead of duplicating it inline */ | |
1127 | ||
1128 | if (params->has_compress_level) { | |
1129 | dest->compress_level = params->compress_level; | |
1130 | } | |
1131 | ||
1132 | if (params->has_compress_threads) { | |
1133 | dest->compress_threads = params->compress_threads; | |
1134 | } | |
1135 | ||
1d58872a XG |
1136 | if (params->has_compress_wait_thread) { |
1137 | dest->compress_wait_thread = params->compress_wait_thread; | |
1138 | } | |
1139 | ||
1bda8b3c MA |
1140 | if (params->has_decompress_threads) { |
1141 | dest->decompress_threads = params->decompress_threads; | |
1142 | } | |
1143 | ||
1144 | if (params->has_cpu_throttle_initial) { | |
1145 | dest->cpu_throttle_initial = params->cpu_throttle_initial; | |
1146 | } | |
1147 | ||
1148 | if (params->has_cpu_throttle_increment) { | |
1149 | dest->cpu_throttle_increment = params->cpu_throttle_increment; | |
1150 | } | |
1151 | ||
1152 | if (params->has_tls_creds) { | |
01fa5598 MA |
1153 | assert(params->tls_creds->type == QTYPE_QSTRING); |
1154 | dest->tls_creds = g_strdup(params->tls_creds->u.s); | |
1bda8b3c MA |
1155 | } |
1156 | ||
1157 | if (params->has_tls_hostname) { | |
01fa5598 MA |
1158 | assert(params->tls_hostname->type == QTYPE_QSTRING); |
1159 | dest->tls_hostname = g_strdup(params->tls_hostname->u.s); | |
1bda8b3c MA |
1160 | } |
1161 | ||
1162 | if (params->has_max_bandwidth) { | |
1163 | dest->max_bandwidth = params->max_bandwidth; | |
1164 | } | |
1165 | ||
1166 | if (params->has_downtime_limit) { | |
1167 | dest->downtime_limit = params->downtime_limit; | |
1168 | } | |
1169 | ||
1170 | if (params->has_x_checkpoint_delay) { | |
1171 | dest->x_checkpoint_delay = params->x_checkpoint_delay; | |
1172 | } | |
1173 | ||
1174 | if (params->has_block_incremental) { | |
1175 | dest->block_incremental = params->block_incremental; | |
1176 | } | |
5e7577a1 JQ |
1177 | if (params->has_x_multifd_channels) { |
1178 | dest->x_multifd_channels = params->x_multifd_channels; | |
1179 | } | |
1180 | if (params->has_x_multifd_page_count) { | |
1181 | dest->x_multifd_page_count = params->x_multifd_page_count; | |
1182 | } | |
73af8dd8 JQ |
1183 | if (params->has_xbzrle_cache_size) { |
1184 | dest->xbzrle_cache_size = params->xbzrle_cache_size; | |
1185 | } | |
7e555c6c DDAG |
1186 | if (params->has_max_postcopy_bandwidth) { |
1187 | dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth; | |
1188 | } | |
4cbc9c7f LQ |
1189 | if (params->has_max_cpu_throttle) { |
1190 | dest->max_cpu_throttle = params->max_cpu_throttle; | |
1191 | } | |
1bda8b3c MA |
1192 | } |
1193 | ||
73af8dd8 | 1194 | static void migrate_params_apply(MigrateSetParameters *params, Error **errp) |
16d063bc PX |
1195 | { |
1196 | MigrationState *s = migrate_get_current(); | |
1197 | ||
e87fae4c MA |
1198 | /* TODO use QAPI_CLONE() instead of duplicating it inline */ |
1199 | ||
7f375e04 EB |
1200 | if (params->has_compress_level) { |
1201 | s->parameters.compress_level = params->compress_level; | |
85de8323 | 1202 | } |
476c72aa | 1203 | |
7f375e04 EB |
1204 | if (params->has_compress_threads) { |
1205 | s->parameters.compress_threads = params->compress_threads; | |
85de8323 | 1206 | } |
476c72aa | 1207 | |
1d58872a XG |
1208 | if (params->has_compress_wait_thread) { |
1209 | s->parameters.compress_wait_thread = params->compress_wait_thread; | |
1210 | } | |
1211 | ||
7f375e04 EB |
1212 | if (params->has_decompress_threads) { |
1213 | s->parameters.decompress_threads = params->decompress_threads; | |
85de8323 | 1214 | } |
476c72aa | 1215 | |
7f375e04 EB |
1216 | if (params->has_cpu_throttle_initial) { |
1217 | s->parameters.cpu_throttle_initial = params->cpu_throttle_initial; | |
1626fee3 | 1218 | } |
476c72aa | 1219 | |
7f375e04 EB |
1220 | if (params->has_cpu_throttle_increment) { |
1221 | s->parameters.cpu_throttle_increment = params->cpu_throttle_increment; | |
1626fee3 | 1222 | } |
476c72aa | 1223 | |
7f375e04 | 1224 | if (params->has_tls_creds) { |
69ef1f36 | 1225 | g_free(s->parameters.tls_creds); |
01fa5598 MA |
1226 | assert(params->tls_creds->type == QTYPE_QSTRING); |
1227 | s->parameters.tls_creds = g_strdup(params->tls_creds->u.s); | |
69ef1f36 | 1228 | } |
476c72aa | 1229 | |
7f375e04 | 1230 | if (params->has_tls_hostname) { |
69ef1f36 | 1231 | g_free(s->parameters.tls_hostname); |
01fa5598 MA |
1232 | assert(params->tls_hostname->type == QTYPE_QSTRING); |
1233 | s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s); | |
69ef1f36 | 1234 | } |
476c72aa | 1235 | |
2ff30257 AA |
1236 | if (params->has_max_bandwidth) { |
1237 | s->parameters.max_bandwidth = params->max_bandwidth; | |
1238 | if (s->to_dst_file) { | |
1239 | qemu_file_set_rate_limit(s->to_dst_file, | |
1240 | s->parameters.max_bandwidth / XFER_LIMIT_RATIO); | |
1241 | } | |
1242 | } | |
476c72aa | 1243 | |
2ff30257 AA |
1244 | if (params->has_downtime_limit) { |
1245 | s->parameters.downtime_limit = params->downtime_limit; | |
1246 | } | |
68b53591 HZ |
1247 | |
1248 | if (params->has_x_checkpoint_delay) { | |
1249 | s->parameters.x_checkpoint_delay = params->x_checkpoint_delay; | |
479125d5 HZ |
1250 | if (migration_in_colo_state()) { |
1251 | colo_checkpoint_notify(s); | |
1252 | } | |
68b53591 | 1253 | } |
476c72aa | 1254 | |
2833c59b JQ |
1255 | if (params->has_block_incremental) { |
1256 | s->parameters.block_incremental = params->block_incremental; | |
1257 | } | |
4075fb1c JQ |
1258 | if (params->has_x_multifd_channels) { |
1259 | s->parameters.x_multifd_channels = params->x_multifd_channels; | |
1260 | } | |
0fb86605 JQ |
1261 | if (params->has_x_multifd_page_count) { |
1262 | s->parameters.x_multifd_page_count = params->x_multifd_page_count; | |
1263 | } | |
73af8dd8 JQ |
1264 | if (params->has_xbzrle_cache_size) { |
1265 | s->parameters.xbzrle_cache_size = params->xbzrle_cache_size; | |
1266 | xbzrle_cache_resize(params->xbzrle_cache_size, errp); | |
1267 | } | |
7e555c6c DDAG |
1268 | if (params->has_max_postcopy_bandwidth) { |
1269 | s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth; | |
1270 | } | |
4cbc9c7f LQ |
1271 | if (params->has_max_cpu_throttle) { |
1272 | s->parameters.max_cpu_throttle = params->max_cpu_throttle; | |
1273 | } | |
85de8323 LL |
1274 | } |
1275 | ||
1bda8b3c | 1276 | void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp) |
476c72aa | 1277 | { |
1bda8b3c MA |
1278 | MigrationParameters tmp; |
1279 | ||
01fa5598 MA |
1280 | /* TODO Rewrite "" to null instead */ |
1281 | if (params->has_tls_creds | |
1282 | && params->tls_creds->type == QTYPE_QNULL) { | |
cb3e7f08 | 1283 | qobject_unref(params->tls_creds->u.n); |
01fa5598 MA |
1284 | params->tls_creds->type = QTYPE_QSTRING; |
1285 | params->tls_creds->u.s = strdup(""); | |
1286 | } | |
1287 | /* TODO Rewrite "" to null instead */ | |
1288 | if (params->has_tls_hostname | |
1289 | && params->tls_hostname->type == QTYPE_QNULL) { | |
cb3e7f08 | 1290 | qobject_unref(params->tls_hostname->u.n); |
01fa5598 MA |
1291 | params->tls_hostname->type = QTYPE_QSTRING; |
1292 | params->tls_hostname->u.s = strdup(""); | |
1293 | } | |
1294 | ||
1bda8b3c MA |
1295 | migrate_params_test_apply(params, &tmp); |
1296 | ||
1297 | if (!migrate_params_check(&tmp, errp)) { | |
476c72aa PX |
1298 | /* Invalid parameter */ |
1299 | return; | |
1300 | } | |
1301 | ||
73af8dd8 | 1302 | migrate_params_apply(params, errp); |
476c72aa PX |
1303 | } |
1304 | ||
2594f56d | 1305 | |
4886a1bc DDAG |
1306 | void qmp_migrate_start_postcopy(Error **errp) |
1307 | { | |
1308 | MigrationState *s = migrate_get_current(); | |
1309 | ||
16b0fd32 | 1310 | if (!migrate_postcopy()) { |
a54d340b | 1311 | error_setg(errp, "Enable postcopy with migrate_set_capability before" |
4886a1bc DDAG |
1312 | " the start of migration"); |
1313 | return; | |
1314 | } | |
1315 | ||
1316 | if (s->state == MIGRATION_STATUS_NONE) { | |
1317 | error_setg(errp, "Postcopy must be started after migration has been" | |
1318 | " started"); | |
1319 | return; | |
1320 | } | |
1321 | /* | |
1322 | * we don't error if migration has finished since that would be racy | |
1323 | * with issuing this command. | |
1324 | */ | |
1325 | atomic_set(&s->start_postcopy, true); | |
1326 | } | |
1327 | ||
065e2813 AL |
1328 | /* shared migration helpers */ |
1329 | ||
48781e5b | 1330 | void migrate_set_state(int *state, int old_state, int new_state) |
51cf4c1a | 1331 | { |
a31fedee | 1332 | assert(new_state < MIGRATION_STATUS__MAX); |
48781e5b | 1333 | if (atomic_cmpxchg(state, old_state, new_state) == old_state) { |
a31fedee | 1334 | trace_migrate_set_state(MigrationStatus_str(new_state)); |
b05dc723 | 1335 | migrate_generate_event(new_state); |
51cf4c1a Z |
1336 | } |
1337 | } | |
1338 | ||
4e4a3d3a PX |
1339 | static MigrationCapabilityStatusList *migrate_cap_add( |
1340 | MigrationCapabilityStatusList *list, | |
1341 | MigrationCapability index, | |
1342 | bool state) | |
2833c59b JQ |
1343 | { |
1344 | MigrationCapabilityStatusList *cap; | |
1345 | ||
1346 | cap = g_new0(MigrationCapabilityStatusList, 1); | |
1347 | cap->value = g_new0(MigrationCapabilityStatus, 1); | |
4e4a3d3a PX |
1348 | cap->value->capability = index; |
1349 | cap->value->state = state; | |
1350 | cap->next = list; | |
1351 | ||
1352 | return cap; | |
1353 | } | |
1354 | ||
1355 | void migrate_set_block_enabled(bool value, Error **errp) | |
1356 | { | |
1357 | MigrationCapabilityStatusList *cap; | |
1358 | ||
1359 | cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value); | |
2833c59b JQ |
1360 | qmp_migrate_set_capabilities(cap, errp); |
1361 | qapi_free_MigrationCapabilityStatusList(cap); | |
1362 | } | |
1363 | ||
1364 | static void migrate_set_block_incremental(MigrationState *s, bool value) | |
1365 | { | |
1366 | s->parameters.block_incremental = value; | |
1367 | } | |
1368 | ||
1369 | static void block_cleanup_parameters(MigrationState *s) | |
1370 | { | |
1371 | if (s->must_remove_block_options) { | |
1372 | /* setting to false can never fail */ | |
1373 | migrate_set_block_enabled(false, &error_abort); | |
1374 | migrate_set_block_incremental(s, false); | |
1375 | s->must_remove_block_options = false; | |
1376 | } | |
1377 | } | |
1378 | ||
bb1fadc4 | 1379 | static void migrate_fd_cleanup(void *opaque) |
065e2813 | 1380 | { |
bb1fadc4 PB |
1381 | MigrationState *s = opaque; |
1382 | ||
1383 | qemu_bh_delete(s->cleanup_bh); | |
1384 | s->cleanup_bh = NULL; | |
1385 | ||
0ceccd85 PX |
1386 | qemu_savevm_state_cleanup(); |
1387 | ||
89a02a9f | 1388 | if (s->to_dst_file) { |
62df066f | 1389 | QEMUFile *tmp; |
f986c3d2 | 1390 | |
9013dca5 | 1391 | trace_migrate_fd_cleanup(); |
404a7c05 | 1392 | qemu_mutex_unlock_iothread(); |
1d34e4bf DDAG |
1393 | if (s->migration_thread_running) { |
1394 | qemu_thread_join(&s->thread); | |
1395 | s->migration_thread_running = false; | |
1396 | } | |
404a7c05 PB |
1397 | qemu_mutex_lock_iothread(); |
1398 | ||
1398b2e3 | 1399 | multifd_save_cleanup(); |
62df066f PX |
1400 | qemu_mutex_lock(&s->qemu_file_lock); |
1401 | tmp = s->to_dst_file; | |
89a02a9f | 1402 | s->to_dst_file = NULL; |
62df066f PX |
1403 | qemu_mutex_unlock(&s->qemu_file_lock); |
1404 | /* | |
1405 | * Close the file handle without the lock to make sure the | |
1406 | * critical section won't block for long. | |
1407 | */ | |
1408 | qemu_fclose(tmp); | |
065e2813 AL |
1409 | } |
1410 | ||
9ec055ae DDAG |
1411 | assert((s->state != MIGRATION_STATUS_ACTIVE) && |
1412 | (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE)); | |
7a2c1721 | 1413 | |
94f5a437 | 1414 | if (s->state == MIGRATION_STATUS_CANCELLING) { |
48781e5b | 1415 | migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, |
94f5a437 | 1416 | MIGRATION_STATUS_CANCELLED); |
7a2c1721 | 1417 | } |
a3fa1d78 | 1418 | |
87db1a7d JQ |
1419 | if (s->error) { |
1420 | /* It is used on info migrate. We can't free it */ | |
1421 | error_report_err(error_copy(s->error)); | |
1422 | } | |
a3fa1d78 | 1423 | notifier_list_notify(&migration_state_notifiers, s); |
2833c59b | 1424 | block_cleanup_parameters(s); |
065e2813 AL |
1425 | } |
1426 | ||
87db1a7d JQ |
1427 | void migrate_set_error(MigrationState *s, const Error *error) |
1428 | { | |
1429 | qemu_mutex_lock(&s->error_mutex); | |
1430 | if (!s->error) { | |
1431 | s->error = error_copy(error); | |
1432 | } | |
1433 | qemu_mutex_unlock(&s->error_mutex); | |
1434 | } | |
1435 | ||
d59ce6f3 | 1436 | void migrate_fd_error(MigrationState *s, const Error *error) |
065e2813 | 1437 | { |
25174055 | 1438 | trace_migrate_fd_error(error_get_pretty(error)); |
89a02a9f | 1439 | assert(s->to_dst_file == NULL); |
48781e5b HZ |
1440 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1441 | MIGRATION_STATUS_FAILED); | |
87db1a7d | 1442 | migrate_set_error(s, error); |
458cf28e JQ |
1443 | } |
1444 | ||
0edda1c4 | 1445 | static void migrate_fd_cancel(MigrationState *s) |
065e2813 | 1446 | { |
6f2b811a | 1447 | int old_state ; |
89a02a9f | 1448 | QEMUFile *f = migrate_get_current()->to_dst_file; |
9013dca5 | 1449 | trace_migrate_fd_cancel(); |
065e2813 | 1450 | |
70b20477 DDAG |
1451 | if (s->rp_state.from_dst_file) { |
1452 | /* shutdown the rp socket, so causing the rp thread to shutdown */ | |
1453 | qemu_file_shutdown(s->rp_state.from_dst_file); | |
1454 | } | |
1455 | ||
6f2b811a Z |
1456 | do { |
1457 | old_state = s->state; | |
f6844b99 | 1458 | if (!migration_is_setup_or_active(old_state)) { |
6f2b811a Z |
1459 | break; |
1460 | } | |
a7b36b48 DDAG |
1461 | /* If the migration is paused, kick it out of the pause */ |
1462 | if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) { | |
1463 | qemu_sem_post(&s->pause_sem); | |
1464 | } | |
48781e5b | 1465 | migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); |
31194731 | 1466 | } while (s->state != MIGRATION_STATUS_CANCELLING); |
a26ba26e DDAG |
1467 | |
1468 | /* | |
1469 | * If we're unlucky the migration code might be stuck somewhere in a | |
1470 | * send/write while the network has failed and is waiting to timeout; | |
1471 | * if we've got shutdown(2) available then we can force it to quit. | |
1472 | * The outgoing qemu file gets closed in migrate_fd_cleanup that is | |
1473 | * called in a bh, so there is no race against this cancel. | |
1474 | */ | |
31194731 | 1475 | if (s->state == MIGRATION_STATUS_CANCELLING && f) { |
a26ba26e DDAG |
1476 | qemu_file_shutdown(f); |
1477 | } | |
1d2acc31 HZ |
1478 | if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) { |
1479 | Error *local_err = NULL; | |
1480 | ||
1481 | bdrv_invalidate_cache_all(&local_err); | |
1482 | if (local_err) { | |
1483 | error_report_err(local_err); | |
1484 | } else { | |
1485 | s->block_inactive = false; | |
1486 | } | |
1487 | } | |
065e2813 AL |
1488 | } |
1489 | ||
99a0db9b GH |
1490 | void add_migration_state_change_notifier(Notifier *notify) |
1491 | { | |
1492 | notifier_list_add(&migration_state_notifiers, notify); | |
1493 | } | |
1494 | ||
1495 | void remove_migration_state_change_notifier(Notifier *notify) | |
1496 | { | |
31552529 | 1497 | notifier_remove(notify); |
99a0db9b GH |
1498 | } |
1499 | ||
02edd2e7 | 1500 | bool migration_in_setup(MigrationState *s) |
afe2df69 | 1501 | { |
31194731 | 1502 | return s->state == MIGRATION_STATUS_SETUP; |
afe2df69 GH |
1503 | } |
1504 | ||
7073693b | 1505 | bool migration_has_finished(MigrationState *s) |
99a0db9b | 1506 | { |
31194731 | 1507 | return s->state == MIGRATION_STATUS_COMPLETED; |
99a0db9b | 1508 | } |
0edda1c4 | 1509 | |
afe2df69 GH |
1510 | bool migration_has_failed(MigrationState *s) |
1511 | { | |
31194731 HZ |
1512 | return (s->state == MIGRATION_STATUS_CANCELLED || |
1513 | s->state == MIGRATION_STATUS_FAILED); | |
afe2df69 GH |
1514 | } |
1515 | ||
5727309d | 1516 | bool migration_in_postcopy(void) |
9ec055ae | 1517 | { |
5727309d JQ |
1518 | MigrationState *s = migrate_get_current(); |
1519 | ||
9ec055ae DDAG |
1520 | return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); |
1521 | } | |
1522 | ||
b82fc321 DDAG |
1523 | bool migration_in_postcopy_after_devices(MigrationState *s) |
1524 | { | |
5727309d | 1525 | return migration_in_postcopy() && s->postcopy_after_devices; |
b82fc321 DDAG |
1526 | } |
1527 | ||
fab35005 | 1528 | bool migration_is_idle(void) |
fe44dc91 | 1529 | { |
fab35005 | 1530 | MigrationState *s = migrate_get_current(); |
fe44dc91 AA |
1531 | |
1532 | switch (s->state) { | |
1533 | case MIGRATION_STATUS_NONE: | |
1534 | case MIGRATION_STATUS_CANCELLED: | |
1535 | case MIGRATION_STATUS_COMPLETED: | |
1536 | case MIGRATION_STATUS_FAILED: | |
1537 | return true; | |
1538 | case MIGRATION_STATUS_SETUP: | |
1539 | case MIGRATION_STATUS_CANCELLING: | |
1540 | case MIGRATION_STATUS_ACTIVE: | |
1541 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
1542 | case MIGRATION_STATUS_COLO: | |
31e06077 DDAG |
1543 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
1544 | case MIGRATION_STATUS_DEVICE: | |
fe44dc91 AA |
1545 | return false; |
1546 | case MIGRATION_STATUS__MAX: | |
1547 | g_assert_not_reached(); | |
1548 | } | |
1549 | ||
1550 | return false; | |
1551 | } | |
1552 | ||
3e0c8050 | 1553 | void migrate_init(MigrationState *s) |
0edda1c4 | 1554 | { |
389775d1 DDAG |
1555 | /* |
1556 | * Reinitialise all migration state, except | |
1557 | * parameters/capabilities that the user set, and | |
1558 | * locks. | |
1559 | */ | |
1560 | s->bytes_xfer = 0; | |
1561 | s->xfer_limit = 0; | |
1562 | s->cleanup_bh = 0; | |
89a02a9f | 1563 | s->to_dst_file = NULL; |
389775d1 | 1564 | s->state = MIGRATION_STATUS_NONE; |
389775d1 DDAG |
1565 | s->rp_state.from_dst_file = NULL; |
1566 | s->rp_state.error = false; | |
1567 | s->mbps = 0.0; | |
1568 | s->downtime = 0; | |
1569 | s->expected_downtime = 0; | |
389775d1 | 1570 | s->setup_time = 0; |
389775d1 | 1571 | s->start_postcopy = false; |
b82fc321 | 1572 | s->postcopy_after_devices = false; |
389775d1 | 1573 | s->migration_thread_running = false; |
d59ce6f3 DB |
1574 | error_free(s->error); |
1575 | s->error = NULL; | |
389775d1 | 1576 | |
48781e5b | 1577 | migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); |
0edda1c4 | 1578 | |
4af246a3 PX |
1579 | s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
1580 | s->total_time = 0; | |
7287cbd4 | 1581 | s->vm_was_running = false; |
b15df1ae PX |
1582 | s->iteration_initial_bytes = 0; |
1583 | s->threshold_size = 0; | |
0edda1c4 | 1584 | } |
cab30143 | 1585 | |
fa2756b7 AL |
1586 | static GSList *migration_blockers; |
1587 | ||
fe44dc91 | 1588 | int migrate_add_blocker(Error *reason, Error **errp) |
fa2756b7 | 1589 | { |
3df663e5 | 1590 | if (migrate_get_current()->only_migratable) { |
4b576648 MA |
1591 | error_propagate_prepend(errp, error_copy(reason), |
1592 | "disallowing migration blocker " | |
1593 | "(--only_migratable) for: "); | |
b67b8c3a AA |
1594 | return -EACCES; |
1595 | } | |
1596 | ||
fab35005 | 1597 | if (migration_is_idle()) { |
fe44dc91 AA |
1598 | migration_blockers = g_slist_prepend(migration_blockers, reason); |
1599 | return 0; | |
1600 | } | |
1601 | ||
4b576648 MA |
1602 | error_propagate_prepend(errp, error_copy(reason), |
1603 | "disallowing migration blocker " | |
1604 | "(migration in progress) for: "); | |
fe44dc91 | 1605 | return -EBUSY; |
fa2756b7 AL |
1606 | } |
1607 | ||
1608 | void migrate_del_blocker(Error *reason) | |
1609 | { | |
1610 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
1611 | } | |
1612 | ||
bf1ae1f4 DDAG |
1613 | void qmp_migrate_incoming(const char *uri, Error **errp) |
1614 | { | |
1615 | Error *local_err = NULL; | |
4debb5f5 | 1616 | static bool once = true; |
bf1ae1f4 DDAG |
1617 | |
1618 | if (!deferred_incoming) { | |
4debb5f5 | 1619 | error_setg(errp, "For use with '-incoming defer'"); |
bf1ae1f4 DDAG |
1620 | return; |
1621 | } | |
4debb5f5 DDAG |
1622 | if (!once) { |
1623 | error_setg(errp, "The incoming migration has already been started"); | |
1624 | } | |
bf1ae1f4 DDAG |
1625 | |
1626 | qemu_start_incoming_migration(uri, &local_err); | |
1627 | ||
1628 | if (local_err) { | |
1629 | error_propagate(errp, local_err); | |
1630 | return; | |
1631 | } | |
1632 | ||
4debb5f5 | 1633 | once = false; |
bf1ae1f4 DDAG |
1634 | } |
1635 | ||
02affd41 PX |
1636 | void qmp_migrate_recover(const char *uri, Error **errp) |
1637 | { | |
1638 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
1639 | ||
1640 | if (mis->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
1641 | error_setg(errp, "Migrate recover can only be run " | |
1642 | "when postcopy is paused."); | |
1643 | return; | |
1644 | } | |
1645 | ||
1646 | if (atomic_cmpxchg(&mis->postcopy_recover_triggered, | |
1647 | false, true) == true) { | |
1648 | error_setg(errp, "Migrate recovery is triggered already"); | |
1649 | return; | |
1650 | } | |
1651 | ||
1652 | /* | |
1653 | * Note that this call will never start a real migration; it will | |
1654 | * only re-setup the migration stream and poke existing migration | |
1655 | * to continue using that newly established channel. | |
1656 | */ | |
1657 | qemu_start_incoming_migration(uri, errp); | |
1658 | } | |
1659 | ||
bfbf89c2 PX |
1660 | void qmp_migrate_pause(Error **errp) |
1661 | { | |
1662 | MigrationState *ms = migrate_get_current(); | |
1663 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
1664 | int ret; | |
1665 | ||
1666 | if (ms->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1667 | /* Source side, during postcopy */ | |
1668 | qemu_mutex_lock(&ms->qemu_file_lock); | |
1669 | ret = qemu_file_shutdown(ms->to_dst_file); | |
1670 | qemu_mutex_unlock(&ms->qemu_file_lock); | |
1671 | if (ret) { | |
1672 | error_setg(errp, "Failed to pause source migration"); | |
1673 | } | |
1674 | return; | |
1675 | } | |
1676 | ||
1677 | if (mis->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1678 | ret = qemu_file_shutdown(mis->from_src_file); | |
1679 | if (ret) { | |
1680 | error_setg(errp, "Failed to pause destination migration"); | |
1681 | } | |
1682 | return; | |
1683 | } | |
1684 | ||
1685 | error_setg(errp, "migrate-pause is currently only supported " | |
1686 | "during postcopy-active state"); | |
1687 | } | |
1688 | ||
24f3902b GK |
1689 | bool migration_is_blocked(Error **errp) |
1690 | { | |
1691 | if (qemu_savevm_state_blocked(errp)) { | |
1692 | return true; | |
1693 | } | |
1694 | ||
1695 | if (migration_blockers) { | |
250561e1 | 1696 | error_propagate(errp, error_copy(migration_blockers->data)); |
24f3902b GK |
1697 | return true; |
1698 | } | |
1699 | ||
1700 | return false; | |
1701 | } | |
1702 | ||
d3e35b8f PX |
1703 | /* Returns true if continue to migrate, or false if error detected */ |
1704 | static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc, | |
1705 | bool resume, Error **errp) | |
cab30143 | 1706 | { |
be7059cd | 1707 | Error *local_err = NULL; |
d3e35b8f PX |
1708 | |
1709 | if (resume) { | |
1710 | if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
1711 | error_setg(errp, "Cannot resume if there is no " | |
1712 | "paused migration"); | |
1713 | return false; | |
1714 | } | |
97ca211c PX |
1715 | |
1716 | /* | |
1717 | * Postcopy recovery won't work well with release-ram | |
1718 | * capability since release-ram will drop the page buffer as | |
1719 | * long as the page is put into the send buffer. So if there | |
1720 | * is a network failure happened, any page buffers that have | |
1721 | * not yet reached the destination VM but have already been | |
1722 | * sent from the source VM will be lost forever. Let's refuse | |
1723 | * the client from resuming such a postcopy migration. | |
1724 | * Luckily release-ram was designed to only be used when src | |
1725 | * and destination VMs are on the same host, so it should be | |
1726 | * fine. | |
1727 | */ | |
1728 | if (migrate_release_ram()) { | |
1729 | error_setg(errp, "Postcopy recovery cannot work " | |
1730 | "when release-ram capability is set"); | |
1731 | return false; | |
1732 | } | |
1733 | ||
d3e35b8f PX |
1734 | /* This is a resume, skip init status */ |
1735 | return true; | |
1736 | } | |
cab30143 | 1737 | |
f6844b99 | 1738 | if (migration_is_setup_or_active(s->state) || |
0b827d5e HZ |
1739 | s->state == MIGRATION_STATUS_CANCELLING || |
1740 | s->state == MIGRATION_STATUS_COLO) { | |
c6bd8c70 | 1741 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
d3e35b8f | 1742 | return false; |
cab30143 | 1743 | } |
d3e35b8f | 1744 | |
ca99993a DDAG |
1745 | if (runstate_check(RUN_STATE_INMIGRATE)) { |
1746 | error_setg(errp, "Guest is waiting for an incoming migration"); | |
d3e35b8f | 1747 | return false; |
ca99993a DDAG |
1748 | } |
1749 | ||
24f3902b | 1750 | if (migration_is_blocked(errp)) { |
d3e35b8f | 1751 | return false; |
fa2756b7 AL |
1752 | } |
1753 | ||
d3e35b8f | 1754 | if (blk || blk_inc) { |
2833c59b JQ |
1755 | if (migrate_use_block() || migrate_use_block_incremental()) { |
1756 | error_setg(errp, "Command options are incompatible with " | |
1757 | "current migration capabilities"); | |
d3e35b8f | 1758 | return false; |
2833c59b JQ |
1759 | } |
1760 | migrate_set_block_enabled(true, &local_err); | |
1761 | if (local_err) { | |
1762 | error_propagate(errp, local_err); | |
d3e35b8f | 1763 | return false; |
2833c59b JQ |
1764 | } |
1765 | s->must_remove_block_options = true; | |
1766 | } | |
1767 | ||
d3e35b8f | 1768 | if (blk_inc) { |
2833c59b JQ |
1769 | migrate_set_block_incremental(s, true); |
1770 | } | |
1771 | ||
3e0c8050 | 1772 | migrate_init(s); |
cab30143 | 1773 | |
d3e35b8f PX |
1774 | return true; |
1775 | } | |
1776 | ||
1777 | void qmp_migrate(const char *uri, bool has_blk, bool blk, | |
1778 | bool has_inc, bool inc, bool has_detach, bool detach, | |
1779 | bool has_resume, bool resume, Error **errp) | |
1780 | { | |
1781 | Error *local_err = NULL; | |
1782 | MigrationState *s = migrate_get_current(); | |
1783 | const char *p; | |
1784 | ||
1785 | if (!migrate_prepare(s, has_blk && blk, has_inc && inc, | |
1786 | has_resume && resume, errp)) { | |
1787 | /* Error detected, put into errp */ | |
1788 | return; | |
1789 | } | |
1790 | ||
cab30143 | 1791 | if (strstart(uri, "tcp:", &p)) { |
f37afb5a | 1792 | tcp_start_outgoing_migration(s, p, &local_err); |
2da776db | 1793 | #ifdef CONFIG_RDMA |
41310c68 | 1794 | } else if (strstart(uri, "rdma:", &p)) { |
2da776db MH |
1795 | rdma_start_outgoing_migration(s, p, &local_err); |
1796 | #endif | |
cab30143 | 1797 | } else if (strstart(uri, "exec:", &p)) { |
f37afb5a | 1798 | exec_start_outgoing_migration(s, p, &local_err); |
cab30143 | 1799 | } else if (strstart(uri, "unix:", &p)) { |
f37afb5a | 1800 | unix_start_outgoing_migration(s, p, &local_err); |
cab30143 | 1801 | } else if (strstart(uri, "fd:", &p)) { |
f37afb5a | 1802 | fd_start_outgoing_migration(s, p, &local_err); |
99a0db9b | 1803 | } else { |
c6bd8c70 MA |
1804 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri", |
1805 | "a valid migration protocol"); | |
48781e5b HZ |
1806 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1807 | MIGRATION_STATUS_FAILED); | |
09576e74 | 1808 | block_cleanup_parameters(s); |
e1c37d0e | 1809 | return; |
cab30143 JQ |
1810 | } |
1811 | ||
f37afb5a | 1812 | if (local_err) { |
d59ce6f3 | 1813 | migrate_fd_error(s, local_err); |
f37afb5a | 1814 | error_propagate(errp, local_err); |
e1c37d0e | 1815 | return; |
1299c631 | 1816 | } |
cab30143 JQ |
1817 | } |
1818 | ||
6cdedb07 | 1819 | void qmp_migrate_cancel(Error **errp) |
cab30143 | 1820 | { |
17549e84 | 1821 | migrate_fd_cancel(migrate_get_current()); |
cab30143 JQ |
1822 | } |
1823 | ||
89cfc02c DDAG |
1824 | void qmp_migrate_continue(MigrationStatus state, Error **errp) |
1825 | { | |
1826 | MigrationState *s = migrate_get_current(); | |
1827 | if (s->state != state) { | |
1828 | error_setg(errp, "Migration not in expected state: %s", | |
1829 | MigrationStatus_str(s->state)); | |
1830 | return; | |
1831 | } | |
1832 | qemu_sem_post(&s->pause_sem); | |
1833 | } | |
1834 | ||
9e1ba4cc OW |
1835 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) |
1836 | { | |
73af8dd8 JQ |
1837 | MigrateSetParameters p = { |
1838 | .has_xbzrle_cache_size = true, | |
1839 | .xbzrle_cache_size = value, | |
1840 | }; | |
c91e681a | 1841 | |
73af8dd8 | 1842 | qmp_migrate_set_parameters(&p, errp); |
9e1ba4cc OW |
1843 | } |
1844 | ||
1845 | int64_t qmp_query_migrate_cache_size(Error **errp) | |
1846 | { | |
1847 | return migrate_xbzrle_cache_size(); | |
1848 | } | |
1849 | ||
3dc85383 | 1850 | void qmp_migrate_set_speed(int64_t value, Error **errp) |
cab30143 | 1851 | { |
1bda8b3c | 1852 | MigrateSetParameters p = { |
2ff30257 AA |
1853 | .has_max_bandwidth = true, |
1854 | .max_bandwidth = value, | |
1855 | }; | |
cab30143 | 1856 | |
2ff30257 | 1857 | qmp_migrate_set_parameters(&p, errp); |
cab30143 JQ |
1858 | } |
1859 | ||
4f0a993b | 1860 | void qmp_migrate_set_downtime(double value, Error **errp) |
cab30143 | 1861 | { |
87c9cc1c DHB |
1862 | if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) { |
1863 | error_setg(errp, "Parameter 'downtime_limit' expects an integer in " | |
1864 | "the range of 0 to %d seconds", | |
1865 | MAX_MIGRATE_DOWNTIME_SECONDS); | |
1866 | return; | |
1867 | } | |
1868 | ||
2ff30257 AA |
1869 | value *= 1000; /* Convert to milliseconds */ |
1870 | value = MAX(0, MIN(INT64_MAX, value)); | |
1871 | ||
1bda8b3c | 1872 | MigrateSetParameters p = { |
2ff30257 AA |
1873 | .has_downtime_limit = true, |
1874 | .downtime_limit = value, | |
1875 | }; | |
1876 | ||
1877 | qmp_migrate_set_parameters(&p, errp); | |
99a0db9b | 1878 | } |
17ad9b35 | 1879 | |
53f09a10 PB |
1880 | bool migrate_release_ram(void) |
1881 | { | |
1882 | MigrationState *s; | |
1883 | ||
1884 | s = migrate_get_current(); | |
1885 | ||
1886 | return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM]; | |
1887 | } | |
1888 | ||
53dd370c DDAG |
1889 | bool migrate_postcopy_ram(void) |
1890 | { | |
1891 | MigrationState *s; | |
1892 | ||
1893 | s = migrate_get_current(); | |
1894 | ||
32c3db5b | 1895 | return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM]; |
53dd370c DDAG |
1896 | } |
1897 | ||
58110f0a VSO |
1898 | bool migrate_postcopy(void) |
1899 | { | |
dd6bb914 | 1900 | return migrate_postcopy_ram() || migrate_dirty_bitmaps(); |
58110f0a VSO |
1901 | } |
1902 | ||
bde1e2ec CV |
1903 | bool migrate_auto_converge(void) |
1904 | { | |
1905 | MigrationState *s; | |
1906 | ||
1907 | s = migrate_get_current(); | |
1908 | ||
1909 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; | |
1910 | } | |
1911 | ||
323004a3 PL |
1912 | bool migrate_zero_blocks(void) |
1913 | { | |
1914 | MigrationState *s; | |
1915 | ||
1916 | s = migrate_get_current(); | |
1917 | ||
1918 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; | |
1919 | } | |
1920 | ||
f22f928e AP |
1921 | bool migrate_postcopy_blocktime(void) |
1922 | { | |
1923 | MigrationState *s; | |
1924 | ||
1925 | s = migrate_get_current(); | |
1926 | ||
1927 | return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME]; | |
1928 | } | |
1929 | ||
8706d2d5 LL |
1930 | bool migrate_use_compression(void) |
1931 | { | |
dde4e694 LL |
1932 | MigrationState *s; |
1933 | ||
1934 | s = migrate_get_current(); | |
1935 | ||
1936 | return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS]; | |
8706d2d5 LL |
1937 | } |
1938 | ||
1939 | int migrate_compress_level(void) | |
1940 | { | |
1941 | MigrationState *s; | |
1942 | ||
1943 | s = migrate_get_current(); | |
1944 | ||
2594f56d | 1945 | return s->parameters.compress_level; |
8706d2d5 LL |
1946 | } |
1947 | ||
1948 | int migrate_compress_threads(void) | |
1949 | { | |
1950 | MigrationState *s; | |
1951 | ||
1952 | s = migrate_get_current(); | |
1953 | ||
2594f56d | 1954 | return s->parameters.compress_threads; |
8706d2d5 LL |
1955 | } |
1956 | ||
1d58872a XG |
1957 | int migrate_compress_wait_thread(void) |
1958 | { | |
1959 | MigrationState *s; | |
1960 | ||
1961 | s = migrate_get_current(); | |
1962 | ||
1963 | return s->parameters.compress_wait_thread; | |
1964 | } | |
1965 | ||
3fcb38c2 LL |
1966 | int migrate_decompress_threads(void) |
1967 | { | |
1968 | MigrationState *s; | |
1969 | ||
1970 | s = migrate_get_current(); | |
1971 | ||
2594f56d | 1972 | return s->parameters.decompress_threads; |
3fcb38c2 LL |
1973 | } |
1974 | ||
55efc8c2 VSO |
1975 | bool migrate_dirty_bitmaps(void) |
1976 | { | |
1977 | MigrationState *s; | |
1978 | ||
1979 | s = migrate_get_current(); | |
1980 | ||
1981 | return s->enabled_capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS]; | |
1982 | } | |
1983 | ||
b05dc723 JQ |
1984 | bool migrate_use_events(void) |
1985 | { | |
1986 | MigrationState *s; | |
1987 | ||
1988 | s = migrate_get_current(); | |
1989 | ||
1990 | return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS]; | |
1991 | } | |
1992 | ||
30126bbf JQ |
1993 | bool migrate_use_multifd(void) |
1994 | { | |
1995 | MigrationState *s; | |
1996 | ||
1997 | s = migrate_get_current(); | |
1998 | ||
1999 | return s->enabled_capabilities[MIGRATION_CAPABILITY_X_MULTIFD]; | |
2000 | } | |
2001 | ||
93fbd031 DDAG |
2002 | bool migrate_pause_before_switchover(void) |
2003 | { | |
2004 | MigrationState *s; | |
2005 | ||
2006 | s = migrate_get_current(); | |
2007 | ||
2008 | return s->enabled_capabilities[ | |
2009 | MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER]; | |
2010 | } | |
2011 | ||
4075fb1c JQ |
2012 | int migrate_multifd_channels(void) |
2013 | { | |
2014 | MigrationState *s; | |
2015 | ||
2016 | s = migrate_get_current(); | |
2017 | ||
2018 | return s->parameters.x_multifd_channels; | |
2019 | } | |
2020 | ||
0fb86605 JQ |
2021 | int migrate_multifd_page_count(void) |
2022 | { | |
2023 | MigrationState *s; | |
2024 | ||
2025 | s = migrate_get_current(); | |
2026 | ||
2027 | return s->parameters.x_multifd_page_count; | |
2028 | } | |
2029 | ||
17ad9b35 OW |
2030 | int migrate_use_xbzrle(void) |
2031 | { | |
2032 | MigrationState *s; | |
2033 | ||
2034 | s = migrate_get_current(); | |
2035 | ||
2036 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; | |
2037 | } | |
2038 | ||
2039 | int64_t migrate_xbzrle_cache_size(void) | |
2040 | { | |
2041 | MigrationState *s; | |
2042 | ||
2043 | s = migrate_get_current(); | |
2044 | ||
73af8dd8 | 2045 | return s->parameters.xbzrle_cache_size; |
17ad9b35 | 2046 | } |
0d82d0e8 | 2047 | |
7e555c6c DDAG |
2048 | static int64_t migrate_max_postcopy_bandwidth(void) |
2049 | { | |
2050 | MigrationState *s; | |
2051 | ||
2052 | s = migrate_get_current(); | |
2053 | ||
2054 | return s->parameters.max_postcopy_bandwidth; | |
2055 | } | |
2056 | ||
2833c59b JQ |
2057 | bool migrate_use_block(void) |
2058 | { | |
2059 | MigrationState *s; | |
2060 | ||
2061 | s = migrate_get_current(); | |
2062 | ||
2063 | return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK]; | |
2064 | } | |
2065 | ||
c788ada8 PX |
2066 | bool migrate_use_return_path(void) |
2067 | { | |
2068 | MigrationState *s; | |
2069 | ||
2070 | s = migrate_get_current(); | |
2071 | ||
2072 | return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH]; | |
2073 | } | |
2074 | ||
2833c59b JQ |
2075 | bool migrate_use_block_incremental(void) |
2076 | { | |
2077 | MigrationState *s; | |
2078 | ||
2079 | s = migrate_get_current(); | |
2080 | ||
2081 | return s->parameters.block_incremental; | |
2082 | } | |
2083 | ||
70b20477 DDAG |
2084 | /* migration thread support */ |
2085 | /* | |
2086 | * Something bad happened to the RP stream, mark an error | |
2087 | * The caller shall print or trace something to indicate why | |
2088 | */ | |
2089 | static void mark_source_rp_bad(MigrationState *s) | |
2090 | { | |
2091 | s->rp_state.error = true; | |
2092 | } | |
2093 | ||
2094 | static struct rp_cmd_args { | |
2095 | ssize_t len; /* -1 = variable */ | |
2096 | const char *name; | |
2097 | } rp_cmd_args[] = { | |
2098 | [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, | |
2099 | [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, | |
2100 | [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, | |
1e2d90eb DDAG |
2101 | [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, |
2102 | [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, | |
a335debb | 2103 | [MIG_RP_MSG_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" }, |
13955b89 | 2104 | [MIG_RP_MSG_RESUME_ACK] = { .len = 4, .name = "RESUME_ACK" }, |
70b20477 DDAG |
2105 | [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, |
2106 | }; | |
2107 | ||
1e2d90eb DDAG |
2108 | /* |
2109 | * Process a request for pages received on the return path, | |
2110 | * We're allowed to send more than requested (e.g. to round to our page size) | |
2111 | * and we don't need to send pages that have already been sent. | |
2112 | */ | |
2113 | static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, | |
2114 | ram_addr_t start, size_t len) | |
2115 | { | |
6c595cde DDAG |
2116 | long our_host_ps = getpagesize(); |
2117 | ||
1e2d90eb | 2118 | trace_migrate_handle_rp_req_pages(rbname, start, len); |
6c595cde DDAG |
2119 | |
2120 | /* | |
2121 | * Since we currently insist on matching page sizes, just sanity check | |
2122 | * we're being asked for whole host pages. | |
2123 | */ | |
2124 | if (start & (our_host_ps-1) || | |
2125 | (len & (our_host_ps-1))) { | |
2126 | error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT | |
2127 | " len: %zd", __func__, start, len); | |
2128 | mark_source_rp_bad(ms); | |
2129 | return; | |
2130 | } | |
2131 | ||
96506894 | 2132 | if (ram_save_queue_pages(rbname, start, len)) { |
6c595cde DDAG |
2133 | mark_source_rp_bad(ms); |
2134 | } | |
1e2d90eb DDAG |
2135 | } |
2136 | ||
14b1742e PX |
2137 | /* Return true to retry, false to quit */ |
2138 | static bool postcopy_pause_return_path_thread(MigrationState *s) | |
2139 | { | |
2140 | trace_postcopy_pause_return_path(); | |
2141 | ||
2142 | qemu_sem_wait(&s->postcopy_pause_rp_sem); | |
2143 | ||
2144 | trace_postcopy_pause_return_path_continued(); | |
2145 | ||
2146 | return true; | |
2147 | } | |
2148 | ||
a335debb PX |
2149 | static int migrate_handle_rp_recv_bitmap(MigrationState *s, char *block_name) |
2150 | { | |
2151 | RAMBlock *block = qemu_ram_block_by_name(block_name); | |
2152 | ||
2153 | if (!block) { | |
2154 | error_report("%s: invalid block name '%s'", __func__, block_name); | |
2155 | return -EINVAL; | |
2156 | } | |
2157 | ||
2158 | /* Fetch the received bitmap and refresh the dirty bitmap */ | |
2159 | return ram_dirty_bitmap_reload(s, block); | |
2160 | } | |
2161 | ||
13955b89 PX |
2162 | static int migrate_handle_rp_resume_ack(MigrationState *s, uint32_t value) |
2163 | { | |
2164 | trace_source_return_path_thread_resume_ack(value); | |
2165 | ||
2166 | if (value != MIGRATION_RESUME_ACK_VALUE) { | |
2167 | error_report("%s: illegal resume_ack value %"PRIu32, | |
2168 | __func__, value); | |
2169 | return -1; | |
2170 | } | |
2171 | ||
2172 | /* Now both sides are active. */ | |
2173 | migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_RECOVER, | |
2174 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
2175 | ||
94190696 PX |
2176 | /* Notify send thread that time to continue send pages */ |
2177 | qemu_sem_post(&s->rp_state.rp_sem); | |
13955b89 PX |
2178 | |
2179 | return 0; | |
2180 | } | |
2181 | ||
70b20477 DDAG |
2182 | /* |
2183 | * Handles messages sent on the return path towards the source VM | |
2184 | * | |
2185 | */ | |
2186 | static void *source_return_path_thread(void *opaque) | |
2187 | { | |
2188 | MigrationState *ms = opaque; | |
2189 | QEMUFile *rp = ms->rp_state.from_dst_file; | |
2190 | uint16_t header_len, header_type; | |
568b01ca | 2191 | uint8_t buf[512]; |
70b20477 | 2192 | uint32_t tmp32, sibling_error; |
1e2d90eb DDAG |
2193 | ram_addr_t start = 0; /* =0 to silence warning */ |
2194 | size_t len = 0, expected_len; | |
70b20477 DDAG |
2195 | int res; |
2196 | ||
2197 | trace_source_return_path_thread_entry(); | |
74637e6f | 2198 | rcu_register_thread(); |
14b1742e PX |
2199 | |
2200 | retry: | |
70b20477 DDAG |
2201 | while (!ms->rp_state.error && !qemu_file_get_error(rp) && |
2202 | migration_is_setup_or_active(ms->state)) { | |
2203 | trace_source_return_path_thread_loop_top(); | |
2204 | header_type = qemu_get_be16(rp); | |
2205 | header_len = qemu_get_be16(rp); | |
2206 | ||
7a9ddfbf PX |
2207 | if (qemu_file_get_error(rp)) { |
2208 | mark_source_rp_bad(ms); | |
2209 | goto out; | |
2210 | } | |
2211 | ||
70b20477 DDAG |
2212 | if (header_type >= MIG_RP_MSG_MAX || |
2213 | header_type == MIG_RP_MSG_INVALID) { | |
2214 | error_report("RP: Received invalid message 0x%04x length 0x%04x", | |
2215 | header_type, header_len); | |
2216 | mark_source_rp_bad(ms); | |
2217 | goto out; | |
2218 | } | |
2219 | ||
2220 | if ((rp_cmd_args[header_type].len != -1 && | |
2221 | header_len != rp_cmd_args[header_type].len) || | |
568b01ca | 2222 | header_len > sizeof(buf)) { |
70b20477 DDAG |
2223 | error_report("RP: Received '%s' message (0x%04x) with" |
2224 | "incorrect length %d expecting %zu", | |
2225 | rp_cmd_args[header_type].name, header_type, header_len, | |
2226 | (size_t)rp_cmd_args[header_type].len); | |
2227 | mark_source_rp_bad(ms); | |
2228 | goto out; | |
2229 | } | |
2230 | ||
2231 | /* We know we've got a valid header by this point */ | |
2232 | res = qemu_get_buffer(rp, buf, header_len); | |
2233 | if (res != header_len) { | |
2234 | error_report("RP: Failed reading data for message 0x%04x" | |
2235 | " read %d expected %d", | |
2236 | header_type, res, header_len); | |
2237 | mark_source_rp_bad(ms); | |
2238 | goto out; | |
2239 | } | |
2240 | ||
2241 | /* OK, we have the message and the data */ | |
2242 | switch (header_type) { | |
2243 | case MIG_RP_MSG_SHUT: | |
4d885131 | 2244 | sibling_error = ldl_be_p(buf); |
70b20477 DDAG |
2245 | trace_source_return_path_thread_shut(sibling_error); |
2246 | if (sibling_error) { | |
2247 | error_report("RP: Sibling indicated error %d", sibling_error); | |
2248 | mark_source_rp_bad(ms); | |
2249 | } | |
2250 | /* | |
2251 | * We'll let the main thread deal with closing the RP | |
2252 | * we could do a shutdown(2) on it, but we're the only user | |
2253 | * anyway, so there's nothing gained. | |
2254 | */ | |
2255 | goto out; | |
2256 | ||
2257 | case MIG_RP_MSG_PONG: | |
4d885131 | 2258 | tmp32 = ldl_be_p(buf); |
70b20477 DDAG |
2259 | trace_source_return_path_thread_pong(tmp32); |
2260 | break; | |
2261 | ||
1e2d90eb | 2262 | case MIG_RP_MSG_REQ_PAGES: |
4d885131 PM |
2263 | start = ldq_be_p(buf); |
2264 | len = ldl_be_p(buf + 8); | |
1e2d90eb DDAG |
2265 | migrate_handle_rp_req_pages(ms, NULL, start, len); |
2266 | break; | |
2267 | ||
2268 | case MIG_RP_MSG_REQ_PAGES_ID: | |
2269 | expected_len = 12 + 1; /* header + termination */ | |
2270 | ||
2271 | if (header_len >= expected_len) { | |
4d885131 PM |
2272 | start = ldq_be_p(buf); |
2273 | len = ldl_be_p(buf + 8); | |
1e2d90eb DDAG |
2274 | /* Now we expect an idstr */ |
2275 | tmp32 = buf[12]; /* Length of the following idstr */ | |
2276 | buf[13 + tmp32] = '\0'; | |
2277 | expected_len += tmp32; | |
2278 | } | |
2279 | if (header_len != expected_len) { | |
2280 | error_report("RP: Req_Page_id with length %d expecting %zd", | |
2281 | header_len, expected_len); | |
2282 | mark_source_rp_bad(ms); | |
2283 | goto out; | |
2284 | } | |
2285 | migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); | |
2286 | break; | |
2287 | ||
a335debb PX |
2288 | case MIG_RP_MSG_RECV_BITMAP: |
2289 | if (header_len < 1) { | |
2290 | error_report("%s: missing block name", __func__); | |
2291 | mark_source_rp_bad(ms); | |
2292 | goto out; | |
2293 | } | |
2294 | /* Format: len (1B) + idstr (<255B). This ends the idstr. */ | |
2295 | buf[buf[0] + 1] = '\0'; | |
2296 | if (migrate_handle_rp_recv_bitmap(ms, (char *)(buf + 1))) { | |
2297 | mark_source_rp_bad(ms); | |
2298 | goto out; | |
2299 | } | |
2300 | break; | |
2301 | ||
13955b89 PX |
2302 | case MIG_RP_MSG_RESUME_ACK: |
2303 | tmp32 = ldl_be_p(buf); | |
2304 | if (migrate_handle_rp_resume_ack(ms, tmp32)) { | |
2305 | mark_source_rp_bad(ms); | |
2306 | goto out; | |
2307 | } | |
2308 | break; | |
2309 | ||
70b20477 DDAG |
2310 | default: |
2311 | break; | |
2312 | } | |
2313 | } | |
14b1742e PX |
2314 | |
2315 | out: | |
2316 | res = qemu_file_get_error(rp); | |
2317 | if (res) { | |
2318 | if (res == -EIO) { | |
2319 | /* | |
2320 | * Maybe there is something we can do: it looks like a | |
2321 | * network down issue, and we pause for a recovery. | |
2322 | */ | |
2323 | if (postcopy_pause_return_path_thread(ms)) { | |
2324 | /* Reload rp, reset the rest */ | |
0284a2a8 MAL |
2325 | if (rp != ms->rp_state.from_dst_file) { |
2326 | qemu_fclose(rp); | |
2327 | rp = ms->rp_state.from_dst_file; | |
2328 | } | |
14b1742e PX |
2329 | ms->rp_state.error = false; |
2330 | goto retry; | |
2331 | } | |
2332 | } | |
2333 | ||
70b20477 DDAG |
2334 | trace_source_return_path_thread_bad_end(); |
2335 | mark_source_rp_bad(ms); | |
2336 | } | |
2337 | ||
2338 | trace_source_return_path_thread_end(); | |
70b20477 DDAG |
2339 | ms->rp_state.from_dst_file = NULL; |
2340 | qemu_fclose(rp); | |
74637e6f | 2341 | rcu_unregister_thread(); |
70b20477 DDAG |
2342 | return NULL; |
2343 | } | |
2344 | ||
d3e35b8f PX |
2345 | static int open_return_path_on_source(MigrationState *ms, |
2346 | bool create_thread) | |
70b20477 DDAG |
2347 | { |
2348 | ||
89a02a9f | 2349 | ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); |
70b20477 DDAG |
2350 | if (!ms->rp_state.from_dst_file) { |
2351 | return -1; | |
2352 | } | |
2353 | ||
2354 | trace_open_return_path_on_source(); | |
d3e35b8f PX |
2355 | |
2356 | if (!create_thread) { | |
2357 | /* We're done */ | |
2358 | return 0; | |
2359 | } | |
2360 | ||
70b20477 DDAG |
2361 | qemu_thread_create(&ms->rp_state.rp_thread, "return path", |
2362 | source_return_path_thread, ms, QEMU_THREAD_JOINABLE); | |
2363 | ||
2364 | trace_open_return_path_on_source_continue(); | |
2365 | ||
2366 | return 0; | |
2367 | } | |
2368 | ||
70b20477 DDAG |
2369 | /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ |
2370 | static int await_return_path_close_on_source(MigrationState *ms) | |
2371 | { | |
2372 | /* | |
2373 | * If this is a normal exit then the destination will send a SHUT and the | |
2374 | * rp_thread will exit, however if there's an error we need to cause | |
2375 | * it to exit. | |
2376 | */ | |
89a02a9f | 2377 | if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) { |
70b20477 DDAG |
2378 | /* |
2379 | * shutdown(2), if we have it, will cause it to unblock if it's stuck | |
2380 | * waiting for the destination. | |
2381 | */ | |
2382 | qemu_file_shutdown(ms->rp_state.from_dst_file); | |
2383 | mark_source_rp_bad(ms); | |
2384 | } | |
2385 | trace_await_return_path_close_on_source_joining(); | |
2386 | qemu_thread_join(&ms->rp_state.rp_thread); | |
2387 | trace_await_return_path_close_on_source_close(); | |
2388 | return ms->rp_state.error; | |
2389 | } | |
2390 | ||
1d34e4bf DDAG |
2391 | /* |
2392 | * Switch from normal iteration to postcopy | |
2393 | * Returns non-0 on error | |
2394 | */ | |
7287cbd4 | 2395 | static int postcopy_start(MigrationState *ms) |
1d34e4bf DDAG |
2396 | { |
2397 | int ret; | |
61b67d47 DB |
2398 | QIOChannelBuffer *bioc; |
2399 | QEMUFile *fb; | |
1d34e4bf | 2400 | int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
7e555c6c | 2401 | int64_t bandwidth = migrate_max_postcopy_bandwidth(); |
ef8d6488 | 2402 | bool restart_block = false; |
0331c8ca DDAG |
2403 | int cur_state = MIGRATION_STATUS_ACTIVE; |
2404 | if (!migrate_pause_before_switchover()) { | |
2405 | migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, | |
2406 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
2407 | } | |
1d34e4bf DDAG |
2408 | |
2409 | trace_postcopy_start(); | |
2410 | qemu_mutex_lock_iothread(); | |
2411 | trace_postcopy_start_set_run(); | |
2412 | ||
fb064112 | 2413 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); |
1d34e4bf DDAG |
2414 | global_state_store(); |
2415 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
76b1c7fe KW |
2416 | if (ret < 0) { |
2417 | goto fail; | |
2418 | } | |
1d34e4bf | 2419 | |
0331c8ca DDAG |
2420 | ret = migration_maybe_pause(ms, &cur_state, |
2421 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
2422 | if (ret < 0) { | |
2423 | goto fail; | |
2424 | } | |
2425 | ||
76b1c7fe | 2426 | ret = bdrv_inactivate_all(); |
1d34e4bf DDAG |
2427 | if (ret < 0) { |
2428 | goto fail; | |
2429 | } | |
ef8d6488 | 2430 | restart_block = true; |
1d34e4bf | 2431 | |
1c0d249d DDAG |
2432 | /* |
2433 | * Cause any non-postcopiable, but iterative devices to | |
2434 | * send out their final data. | |
2435 | */ | |
a1fbe750 | 2436 | qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false); |
1c0d249d | 2437 | |
1d34e4bf DDAG |
2438 | /* |
2439 | * in Finish migrate and with the io-lock held everything should | |
2440 | * be quiet, but we've potentially still got dirty pages and we | |
2441 | * need to tell the destination to throw any pages it's already received | |
2442 | * that are dirty | |
2443 | */ | |
58110f0a VSO |
2444 | if (migrate_postcopy_ram()) { |
2445 | if (ram_postcopy_send_discard_bitmap(ms)) { | |
2446 | error_report("postcopy send discard bitmap failed"); | |
2447 | goto fail; | |
2448 | } | |
1d34e4bf DDAG |
2449 | } |
2450 | ||
2451 | /* | |
2452 | * send rest of state - note things that are doing postcopy | |
2453 | * will notice we're in POSTCOPY_ACTIVE and not actually | |
2454 | * wrap their state up here | |
2455 | */ | |
7e555c6c DDAG |
2456 | /* 0 max-postcopy-bandwidth means unlimited */ |
2457 | if (!bandwidth) { | |
2458 | qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX); | |
2459 | } else { | |
2460 | qemu_file_set_rate_limit(ms->to_dst_file, bandwidth / XFER_LIMIT_RATIO); | |
2461 | } | |
58110f0a VSO |
2462 | if (migrate_postcopy_ram()) { |
2463 | /* Ping just for debugging, helps line traces up */ | |
2464 | qemu_savevm_send_ping(ms->to_dst_file, 2); | |
2465 | } | |
1d34e4bf DDAG |
2466 | |
2467 | /* | |
2468 | * While loading the device state we may trigger page transfer | |
2469 | * requests and the fd must be free to process those, and thus | |
2470 | * the destination must read the whole device state off the fd before | |
2471 | * it starts processing it. Unfortunately the ad-hoc migration format | |
2472 | * doesn't allow the destination to know the size to read without fully | |
2473 | * parsing it through each devices load-state code (especially the open | |
2474 | * coded devices that use get/put). | |
2475 | * So we wrap the device state up in a package with a length at the start; | |
2476 | * to do this we use a qemu_buf to hold the whole of the device state. | |
2477 | */ | |
61b67d47 | 2478 | bioc = qio_channel_buffer_new(4096); |
6f01f136 | 2479 | qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer"); |
61b67d47 DB |
2480 | fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc)); |
2481 | object_unref(OBJECT(bioc)); | |
1d34e4bf | 2482 | |
c76201ab DDAG |
2483 | /* |
2484 | * Make sure the receiver can get incoming pages before we send the rest | |
2485 | * of the state | |
2486 | */ | |
2487 | qemu_savevm_send_postcopy_listen(fb); | |
2488 | ||
a1fbe750 | 2489 | qemu_savevm_state_complete_precopy(fb, false, false); |
58110f0a VSO |
2490 | if (migrate_postcopy_ram()) { |
2491 | qemu_savevm_send_ping(fb, 3); | |
2492 | } | |
1d34e4bf DDAG |
2493 | |
2494 | qemu_savevm_send_postcopy_run(fb); | |
2495 | ||
2496 | /* <><> end of stuff going into the package */ | |
1d34e4bf | 2497 | |
ef8d6488 DDAG |
2498 | /* Last point of recovery; as soon as we send the package the destination |
2499 | * can open devices and potentially start running. | |
2500 | * Lets just check again we've not got any errors. | |
2501 | */ | |
2502 | ret = qemu_file_get_error(ms->to_dst_file); | |
2503 | if (ret) { | |
2504 | error_report("postcopy_start: Migration stream errored (pre package)"); | |
2505 | goto fail_closefb; | |
2506 | } | |
2507 | ||
2508 | restart_block = false; | |
2509 | ||
1d34e4bf | 2510 | /* Now send that blob */ |
61b67d47 | 2511 | if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) { |
1d34e4bf DDAG |
2512 | goto fail_closefb; |
2513 | } | |
2514 | qemu_fclose(fb); | |
b82fc321 DDAG |
2515 | |
2516 | /* Send a notify to give a chance for anything that needs to happen | |
2517 | * at the transition to postcopy and after the device state; in particular | |
2518 | * spice needs to trigger a transition now | |
2519 | */ | |
2520 | ms->postcopy_after_devices = true; | |
2521 | notifier_list_notify(&migration_state_notifiers, ms); | |
2522 | ||
1d34e4bf DDAG |
2523 | ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop; |
2524 | ||
2525 | qemu_mutex_unlock_iothread(); | |
2526 | ||
58110f0a VSO |
2527 | if (migrate_postcopy_ram()) { |
2528 | /* | |
2529 | * Although this ping is just for debug, it could potentially be | |
2530 | * used for getting a better measurement of downtime at the source. | |
2531 | */ | |
2532 | qemu_savevm_send_ping(ms->to_dst_file, 4); | |
2533 | } | |
1d34e4bf | 2534 | |
ced1c616 PB |
2535 | if (migrate_release_ram()) { |
2536 | ram_postcopy_migrated_memory_release(ms); | |
2537 | } | |
2538 | ||
89a02a9f | 2539 | ret = qemu_file_get_error(ms->to_dst_file); |
1d34e4bf DDAG |
2540 | if (ret) { |
2541 | error_report("postcopy_start: Migration stream errored"); | |
48781e5b | 2542 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1d34e4bf DDAG |
2543 | MIGRATION_STATUS_FAILED); |
2544 | } | |
2545 | ||
2546 | return ret; | |
2547 | ||
2548 | fail_closefb: | |
2549 | qemu_fclose(fb); | |
2550 | fail: | |
48781e5b | 2551 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1d34e4bf | 2552 | MIGRATION_STATUS_FAILED); |
ef8d6488 DDAG |
2553 | if (restart_block) { |
2554 | /* A failure happened early enough that we know the destination hasn't | |
2555 | * accessed block devices, so we're safe to recover. | |
2556 | */ | |
2557 | Error *local_err = NULL; | |
2558 | ||
2559 | bdrv_invalidate_cache_all(&local_err); | |
2560 | if (local_err) { | |
2561 | error_report_err(local_err); | |
2562 | } | |
2563 | } | |
1d34e4bf DDAG |
2564 | qemu_mutex_unlock_iothread(); |
2565 | return -1; | |
2566 | } | |
2567 | ||
e91d8951 DDAG |
2568 | /** |
2569 | * migration_maybe_pause: Pause if required to by | |
2570 | * migrate_pause_before_switchover called with the iothread locked | |
2571 | * Returns: 0 on success | |
2572 | */ | |
0331c8ca DDAG |
2573 | static int migration_maybe_pause(MigrationState *s, |
2574 | int *current_active_state, | |
2575 | int new_state) | |
e91d8951 DDAG |
2576 | { |
2577 | if (!migrate_pause_before_switchover()) { | |
2578 | return 0; | |
2579 | } | |
2580 | ||
2581 | /* Since leaving this state is not atomic with posting the semaphore | |
2582 | * it's possible that someone could have issued multiple migrate_continue | |
2583 | * and the semaphore is incorrectly positive at this point; | |
2584 | * the docs say it's undefined to reinit a semaphore that's already | |
2585 | * init'd, so use timedwait to eat up any existing posts. | |
2586 | */ | |
2587 | while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) { | |
2588 | /* This block intentionally left blank */ | |
2589 | } | |
2590 | ||
2591 | qemu_mutex_unlock_iothread(); | |
2592 | migrate_set_state(&s->state, *current_active_state, | |
2593 | MIGRATION_STATUS_PRE_SWITCHOVER); | |
2594 | qemu_sem_wait(&s->pause_sem); | |
2595 | migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER, | |
0331c8ca DDAG |
2596 | new_state); |
2597 | *current_active_state = new_state; | |
e91d8951 DDAG |
2598 | qemu_mutex_lock_iothread(); |
2599 | ||
0331c8ca | 2600 | return s->state == new_state ? 0 : -EINVAL; |
e91d8951 DDAG |
2601 | } |
2602 | ||
09f6c85e DDAG |
2603 | /** |
2604 | * migration_completion: Used by migration_thread when there's not much left. | |
2605 | * The caller 'breaks' the loop when this returns. | |
2606 | * | |
2607 | * @s: Current migration state | |
09f6c85e | 2608 | */ |
2ad87305 | 2609 | static void migration_completion(MigrationState *s) |
09f6c85e DDAG |
2610 | { |
2611 | int ret; | |
2ad87305 | 2612 | int current_active_state = s->state; |
09f6c85e | 2613 | |
b10ac0c4 DDAG |
2614 | if (s->state == MIGRATION_STATUS_ACTIVE) { |
2615 | qemu_mutex_lock_iothread(); | |
64909f97 | 2616 | s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
fb064112 | 2617 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); |
7287cbd4 | 2618 | s->vm_was_running = runstate_is_running(); |
b10ac0c4 DDAG |
2619 | ret = global_state_store(); |
2620 | ||
2621 | if (!ret) { | |
a1fbe750 | 2622 | bool inactivate = !migrate_colo_enabled(); |
b10ac0c4 | 2623 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); |
e91d8951 | 2624 | if (ret >= 0) { |
0331c8ca DDAG |
2625 | ret = migration_maybe_pause(s, ¤t_active_state, |
2626 | MIGRATION_STATUS_DEVICE); | |
e91d8951 | 2627 | } |
f07fa4cb KW |
2628 | if (ret >= 0) { |
2629 | qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); | |
a1fbe750 FZ |
2630 | ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false, |
2631 | inactivate); | |
f07fa4cb | 2632 | } |
a1fbe750 FZ |
2633 | if (inactivate && ret >= 0) { |
2634 | s->block_inactive = true; | |
b10ac0c4 DDAG |
2635 | } |
2636 | } | |
2637 | qemu_mutex_unlock_iothread(); | |
09f6c85e | 2638 | |
b10ac0c4 DDAG |
2639 | if (ret < 0) { |
2640 | goto fail; | |
09f6c85e | 2641 | } |
b10ac0c4 DDAG |
2642 | } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { |
2643 | trace_migration_completion_postcopy_end(); | |
2644 | ||
89a02a9f | 2645 | qemu_savevm_state_complete_postcopy(s->to_dst_file); |
b10ac0c4 | 2646 | trace_migration_completion_postcopy_end_after_complete(); |
09f6c85e | 2647 | } |
09f6c85e | 2648 | |
b10ac0c4 DDAG |
2649 | /* |
2650 | * If rp was opened we must clean up the thread before | |
2651 | * cleaning everything else up (since if there are no failures | |
2652 | * it will wait for the destination to send it's status in | |
2653 | * a SHUT command). | |
b10ac0c4 | 2654 | */ |
0425dc97 | 2655 | if (s->rp_state.from_dst_file) { |
b10ac0c4 | 2656 | int rp_error; |
0425dc97 | 2657 | trace_migration_return_path_end_before(); |
b10ac0c4 | 2658 | rp_error = await_return_path_close_on_source(s); |
0425dc97 | 2659 | trace_migration_return_path_end_after(rp_error); |
b10ac0c4 | 2660 | if (rp_error) { |
fe904ea8 | 2661 | goto fail_invalidate; |
b10ac0c4 | 2662 | } |
09f6c85e DDAG |
2663 | } |
2664 | ||
89a02a9f | 2665 | if (qemu_file_get_error(s->to_dst_file)) { |
09f6c85e | 2666 | trace_migration_completion_file_err(); |
fe904ea8 | 2667 | goto fail_invalidate; |
09f6c85e DDAG |
2668 | } |
2669 | ||
0b827d5e HZ |
2670 | if (!migrate_colo_enabled()) { |
2671 | migrate_set_state(&s->state, current_active_state, | |
2672 | MIGRATION_STATUS_COMPLETED); | |
2673 | } | |
2674 | ||
09f6c85e DDAG |
2675 | return; |
2676 | ||
fe904ea8 GK |
2677 | fail_invalidate: |
2678 | /* If not doing postcopy, vm_start() will be called: let's regain | |
2679 | * control on images. | |
2680 | */ | |
6039dd5b DDAG |
2681 | if (s->state == MIGRATION_STATUS_ACTIVE || |
2682 | s->state == MIGRATION_STATUS_DEVICE) { | |
fe904ea8 GK |
2683 | Error *local_err = NULL; |
2684 | ||
1d2acc31 | 2685 | qemu_mutex_lock_iothread(); |
fe904ea8 GK |
2686 | bdrv_invalidate_cache_all(&local_err); |
2687 | if (local_err) { | |
2688 | error_report_err(local_err); | |
1d2acc31 HZ |
2689 | } else { |
2690 | s->block_inactive = false; | |
fe904ea8 | 2691 | } |
1d2acc31 | 2692 | qemu_mutex_unlock_iothread(); |
fe904ea8 GK |
2693 | } |
2694 | ||
09f6c85e | 2695 | fail: |
48781e5b HZ |
2696 | migrate_set_state(&s->state, current_active_state, |
2697 | MIGRATION_STATUS_FAILED); | |
09f6c85e DDAG |
2698 | } |
2699 | ||
35a6ed4f HZ |
2700 | bool migrate_colo_enabled(void) |
2701 | { | |
2702 | MigrationState *s = migrate_get_current(); | |
2703 | return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO]; | |
2704 | } | |
2705 | ||
b23c2ade PX |
2706 | typedef enum MigThrError { |
2707 | /* No error detected */ | |
2708 | MIG_THR_ERR_NONE = 0, | |
2709 | /* Detected error, but resumed successfully */ | |
2710 | MIG_THR_ERR_RECOVERED = 1, | |
2711 | /* Detected fatal error, need to exit */ | |
2712 | MIG_THR_ERR_FATAL = 2, | |
2713 | } MigThrError; | |
2714 | ||
94190696 PX |
2715 | static int postcopy_resume_handshake(MigrationState *s) |
2716 | { | |
2717 | qemu_savevm_send_postcopy_resume(s->to_dst_file); | |
2718 | ||
2719 | while (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
2720 | qemu_sem_wait(&s->rp_state.rp_sem); | |
2721 | } | |
2722 | ||
2723 | if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
2724 | return 0; | |
2725 | } | |
2726 | ||
2727 | return -1; | |
2728 | } | |
2729 | ||
135b87b4 PX |
2730 | /* Return zero if success, or <0 for error */ |
2731 | static int postcopy_do_resume(MigrationState *s) | |
2732 | { | |
d1b8eadb PX |
2733 | int ret; |
2734 | ||
2735 | /* | |
2736 | * Call all the resume_prepare() hooks, so that modules can be | |
2737 | * ready for the migration resume. | |
2738 | */ | |
2739 | ret = qemu_savevm_state_resume_prepare(s); | |
2740 | if (ret) { | |
2741 | error_report("%s: resume_prepare() failure detected: %d", | |
2742 | __func__, ret); | |
2743 | return ret; | |
2744 | } | |
2745 | ||
2746 | /* | |
94190696 PX |
2747 | * Last handshake with destination on the resume (destination will |
2748 | * switch to postcopy-active afterwards) | |
d1b8eadb | 2749 | */ |
94190696 PX |
2750 | ret = postcopy_resume_handshake(s); |
2751 | if (ret) { | |
2752 | error_report("%s: handshake failed: %d", __func__, ret); | |
2753 | return ret; | |
2754 | } | |
d1b8eadb | 2755 | |
135b87b4 PX |
2756 | return 0; |
2757 | } | |
2758 | ||
b23c2ade PX |
2759 | /* |
2760 | * We don't return until we are in a safe state to continue current | |
2761 | * postcopy migration. Returns MIG_THR_ERR_RECOVERED if recovered, or | |
2762 | * MIG_THR_ERR_FATAL if unrecovery failure happened. | |
2763 | */ | |
2764 | static MigThrError postcopy_pause(MigrationState *s) | |
2765 | { | |
2766 | assert(s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
b23c2ade | 2767 | |
135b87b4 | 2768 | while (true) { |
62df066f PX |
2769 | QEMUFile *file; |
2770 | ||
135b87b4 PX |
2771 | migrate_set_state(&s->state, s->state, |
2772 | MIGRATION_STATUS_POSTCOPY_PAUSED); | |
b23c2ade | 2773 | |
135b87b4 PX |
2774 | /* Current channel is possibly broken. Release it. */ |
2775 | assert(s->to_dst_file); | |
62df066f PX |
2776 | qemu_mutex_lock(&s->qemu_file_lock); |
2777 | file = s->to_dst_file; | |
135b87b4 | 2778 | s->to_dst_file = NULL; |
62df066f PX |
2779 | qemu_mutex_unlock(&s->qemu_file_lock); |
2780 | ||
2781 | qemu_file_shutdown(file); | |
2782 | qemu_fclose(file); | |
b23c2ade | 2783 | |
135b87b4 PX |
2784 | error_report("Detected IO failure for postcopy. " |
2785 | "Migration paused."); | |
b23c2ade | 2786 | |
135b87b4 PX |
2787 | /* |
2788 | * We wait until things fixed up. Then someone will setup the | |
2789 | * status back for us. | |
2790 | */ | |
2791 | while (s->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
2792 | qemu_sem_wait(&s->postcopy_pause_sem); | |
2793 | } | |
2794 | ||
2795 | if (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
2796 | /* Woken up by a recover procedure. Give it a shot */ | |
b23c2ade | 2797 | |
135b87b4 PX |
2798 | /* |
2799 | * Firstly, let's wake up the return path now, with a new | |
2800 | * return path channel. | |
2801 | */ | |
2802 | qemu_sem_post(&s->postcopy_pause_rp_sem); | |
2803 | ||
2804 | /* Do the resume logic */ | |
2805 | if (postcopy_do_resume(s) == 0) { | |
2806 | /* Let's continue! */ | |
2807 | trace_postcopy_pause_continued(); | |
2808 | return MIG_THR_ERR_RECOVERED; | |
2809 | } else { | |
2810 | /* | |
2811 | * Something wrong happened during the recovery, let's | |
2812 | * pause again. Pause is always better than throwing | |
2813 | * data away. | |
2814 | */ | |
2815 | continue; | |
2816 | } | |
2817 | } else { | |
2818 | /* This is not right... Time to quit. */ | |
2819 | return MIG_THR_ERR_FATAL; | |
2820 | } | |
2821 | } | |
b23c2ade PX |
2822 | } |
2823 | ||
2824 | static MigThrError migration_detect_error(MigrationState *s) | |
2825 | { | |
2826 | int ret; | |
2827 | ||
2828 | /* Try to detect any file errors */ | |
2829 | ret = qemu_file_get_error(s->to_dst_file); | |
2830 | ||
2831 | if (!ret) { | |
2832 | /* Everything is fine */ | |
2833 | return MIG_THR_ERR_NONE; | |
2834 | } | |
2835 | ||
2836 | if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE && ret == -EIO) { | |
2837 | /* | |
2838 | * For postcopy, we allow the network to be down for a | |
2839 | * while. After that, it can be continued by a | |
2840 | * recovery phase. | |
2841 | */ | |
2842 | return postcopy_pause(s); | |
2843 | } else { | |
2844 | /* | |
2845 | * For precopy (or postcopy with error outside IO), we fail | |
2846 | * with no time. | |
2847 | */ | |
2848 | migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED); | |
2849 | trace_migration_thread_file_err(); | |
2850 | ||
2851 | /* Time to stop the migration, now. */ | |
2852 | return MIG_THR_ERR_FATAL; | |
2853 | } | |
2854 | } | |
2855 | ||
0c8f0efd JQ |
2856 | /* How many bytes have we transferred since the beggining of the migration */ |
2857 | static uint64_t migration_total_bytes(MigrationState *s) | |
2858 | { | |
b9ee2f7d | 2859 | return qemu_ftell(s->to_dst_file) + ram_counters.multifd_bytes; |
0c8f0efd JQ |
2860 | } |
2861 | ||
cf011f08 PX |
2862 | static void migration_calculate_complete(MigrationState *s) |
2863 | { | |
0c8f0efd | 2864 | uint64_t bytes = migration_total_bytes(s); |
cf011f08 | 2865 | int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
6cde6fbe | 2866 | int64_t transfer_time; |
cf011f08 PX |
2867 | |
2868 | s->total_time = end_time - s->start_time; | |
2869 | if (!s->downtime) { | |
2870 | /* | |
2871 | * It's still not set, so we are precopy migration. For | |
2872 | * postcopy, downtime is calculated during postcopy_start(). | |
2873 | */ | |
2874 | s->downtime = end_time - s->downtime_start; | |
2875 | } | |
2876 | ||
6cde6fbe JQ |
2877 | transfer_time = s->total_time - s->setup_time; |
2878 | if (transfer_time) { | |
2879 | s->mbps = ((double) bytes * 8.0) / transfer_time / 1000; | |
cf011f08 PX |
2880 | } |
2881 | } | |
2882 | ||
b15df1ae PX |
2883 | static void migration_update_counters(MigrationState *s, |
2884 | int64_t current_time) | |
2885 | { | |
2886 | uint64_t transferred, time_spent; | |
0c8f0efd | 2887 | uint64_t current_bytes; /* bytes transferred since the beginning */ |
b15df1ae PX |
2888 | double bandwidth; |
2889 | ||
2890 | if (current_time < s->iteration_start_time + BUFFER_DELAY) { | |
2891 | return; | |
2892 | } | |
2893 | ||
0c8f0efd JQ |
2894 | current_bytes = migration_total_bytes(s); |
2895 | transferred = current_bytes - s->iteration_initial_bytes; | |
b15df1ae PX |
2896 | time_spent = current_time - s->iteration_start_time; |
2897 | bandwidth = (double)transferred / time_spent; | |
0781c1ed | 2898 | s->threshold_size = bandwidth * s->parameters.downtime_limit; |
b15df1ae PX |
2899 | |
2900 | s->mbps = (((double) transferred * 8.0) / | |
2901 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; | |
2902 | ||
2903 | /* | |
2904 | * if we haven't sent anything, we don't want to | |
2905 | * recalculate. 10000 is a small enough number for our purposes | |
2906 | */ | |
2907 | if (ram_counters.dirty_pages_rate && transferred > 10000) { | |
650af890 | 2908 | s->expected_downtime = ram_counters.remaining / bandwidth; |
b15df1ae PX |
2909 | } |
2910 | ||
2911 | qemu_file_reset_rate_limit(s->to_dst_file); | |
2912 | ||
2913 | s->iteration_start_time = current_time; | |
0c8f0efd | 2914 | s->iteration_initial_bytes = current_bytes; |
b15df1ae PX |
2915 | |
2916 | trace_migrate_transferred(transferred, time_spent, | |
0781c1ed | 2917 | bandwidth, s->threshold_size); |
b15df1ae PX |
2918 | } |
2919 | ||
2ad87305 PX |
2920 | /* Migration thread iteration status */ |
2921 | typedef enum { | |
2922 | MIG_ITERATE_RESUME, /* Resume current iteration */ | |
2923 | MIG_ITERATE_SKIP, /* Skip current iteration */ | |
2924 | MIG_ITERATE_BREAK, /* Break the loop */ | |
2925 | } MigIterateState; | |
2926 | ||
2927 | /* | |
2928 | * Return true if continue to the next iteration directly, false | |
2929 | * otherwise. | |
2930 | */ | |
2931 | static MigIterateState migration_iteration_run(MigrationState *s) | |
2932 | { | |
47995026 | 2933 | uint64_t pending_size, pend_pre, pend_compat, pend_post; |
2ad87305 PX |
2934 | bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE; |
2935 | ||
47995026 VSO |
2936 | qemu_savevm_state_pending(s->to_dst_file, s->threshold_size, &pend_pre, |
2937 | &pend_compat, &pend_post); | |
2938 | pending_size = pend_pre + pend_compat + pend_post; | |
2ad87305 PX |
2939 | |
2940 | trace_migrate_pending(pending_size, s->threshold_size, | |
47995026 | 2941 | pend_pre, pend_compat, pend_post); |
2ad87305 PX |
2942 | |
2943 | if (pending_size && pending_size >= s->threshold_size) { | |
2944 | /* Still a significant amount to transfer */ | |
2945 | if (migrate_postcopy() && !in_postcopy && | |
47995026 | 2946 | pend_pre <= s->threshold_size && |
2ad87305 PX |
2947 | atomic_read(&s->start_postcopy)) { |
2948 | if (postcopy_start(s)) { | |
2949 | error_report("%s: postcopy failed to start", __func__); | |
2950 | } | |
2951 | return MIG_ITERATE_SKIP; | |
2952 | } | |
2953 | /* Just another iteration step */ | |
2954 | qemu_savevm_state_iterate(s->to_dst_file, | |
2955 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
2956 | } else { | |
2957 | trace_migration_thread_low_pending(pending_size); | |
2958 | migration_completion(s); | |
2959 | return MIG_ITERATE_BREAK; | |
2960 | } | |
2961 | ||
2962 | return MIG_ITERATE_RESUME; | |
2963 | } | |
2964 | ||
199aa6d4 PX |
2965 | static void migration_iteration_finish(MigrationState *s) |
2966 | { | |
2967 | /* If we enabled cpu throttling for auto-converge, turn it off. */ | |
2968 | cpu_throttle_stop(); | |
2969 | ||
2970 | qemu_mutex_lock_iothread(); | |
2971 | switch (s->state) { | |
2972 | case MIGRATION_STATUS_COMPLETED: | |
2973 | migration_calculate_complete(s); | |
2974 | runstate_set(RUN_STATE_POSTMIGRATE); | |
2975 | break; | |
2976 | ||
2977 | case MIGRATION_STATUS_ACTIVE: | |
2978 | /* | |
2979 | * We should really assert here, but since it's during | |
2980 | * migration, let's try to reduce the usage of assertions. | |
2981 | */ | |
2982 | if (!migrate_colo_enabled()) { | |
2983 | error_report("%s: critical error: calling COLO code without " | |
2984 | "COLO enabled", __func__); | |
2985 | } | |
2986 | migrate_start_colo_process(s); | |
2987 | /* | |
2988 | * Fixme: we will run VM in COLO no matter its old running state. | |
2989 | * After exited COLO, we will keep running. | |
2990 | */ | |
2991 | s->vm_was_running = true; | |
2992 | /* Fallthrough */ | |
2993 | case MIGRATION_STATUS_FAILED: | |
2994 | case MIGRATION_STATUS_CANCELLED: | |
57225e5f | 2995 | case MIGRATION_STATUS_CANCELLING: |
199aa6d4 PX |
2996 | if (s->vm_was_running) { |
2997 | vm_start(); | |
2998 | } else { | |
2999 | if (runstate_check(RUN_STATE_FINISH_MIGRATE)) { | |
3000 | runstate_set(RUN_STATE_POSTMIGRATE); | |
3001 | } | |
3002 | } | |
3003 | break; | |
3004 | ||
3005 | default: | |
3006 | /* Should not reach here, but if so, forgive the VM. */ | |
3007 | error_report("%s: Unknown ending state %d", __func__, s->state); | |
3008 | break; | |
3009 | } | |
3010 | qemu_bh_schedule(s->cleanup_bh); | |
3011 | qemu_mutex_unlock_iothread(); | |
3012 | } | |
3013 | ||
ad767bed DDAG |
3014 | void migration_make_urgent_request(void) |
3015 | { | |
3016 | qemu_sem_post(&migrate_get_current()->rate_limit_sem); | |
3017 | } | |
3018 | ||
3019 | void migration_consume_urgent_request(void) | |
3020 | { | |
3021 | qemu_sem_wait(&migrate_get_current()->rate_limit_sem); | |
3022 | } | |
3023 | ||
70b20477 DDAG |
3024 | /* |
3025 | * Master migration thread on the source VM. | |
3026 | * It drives the migration and pumps the data down the outgoing channel. | |
3027 | */ | |
5f496a1b | 3028 | static void *migration_thread(void *opaque) |
0d82d0e8 | 3029 | { |
9848a404 | 3030 | MigrationState *s = opaque; |
bc72ad67 | 3031 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); |
b23c2ade | 3032 | MigThrError thr_error; |
ad767bed | 3033 | bool urgent = false; |
76f5933a | 3034 | |
ab28bd23 PB |
3035 | rcu_register_thread(); |
3036 | ||
b15df1ae PX |
3037 | s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
3038 | ||
89a02a9f | 3039 | qemu_savevm_state_header(s->to_dst_file); |
1d34e4bf | 3040 | |
62a02658 PX |
3041 | /* |
3042 | * If we opened the return path, we need to make sure dst has it | |
3043 | * opened as well. | |
3044 | */ | |
3045 | if (s->rp_state.from_dst_file) { | |
1d34e4bf | 3046 | /* Now tell the dest that it should open its end so it can reply */ |
89a02a9f | 3047 | qemu_savevm_send_open_return_path(s->to_dst_file); |
1d34e4bf DDAG |
3048 | |
3049 | /* And do a ping that will make stuff easier to debug */ | |
89a02a9f | 3050 | qemu_savevm_send_ping(s->to_dst_file, 1); |
0425dc97 | 3051 | } |
1d34e4bf | 3052 | |
58110f0a | 3053 | if (migrate_postcopy()) { |
1d34e4bf DDAG |
3054 | /* |
3055 | * Tell the destination that we *might* want to do postcopy later; | |
3056 | * if the other end can't do postcopy it should fail now, nice and | |
3057 | * early. | |
3058 | */ | |
89a02a9f | 3059 | qemu_savevm_send_postcopy_advise(s->to_dst_file); |
1d34e4bf DDAG |
3060 | } |
3061 | ||
aad555c2 ZC |
3062 | if (migrate_colo_enabled()) { |
3063 | /* Notify migration destination that we enable COLO */ | |
3064 | qemu_savevm_send_colo_enable(s->to_dst_file); | |
3065 | } | |
3066 | ||
9907e842 | 3067 | qemu_savevm_state_setup(s->to_dst_file); |
0d82d0e8 | 3068 | |
bc72ad67 | 3069 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; |
48781e5b HZ |
3070 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
3071 | MIGRATION_STATUS_ACTIVE); | |
29ae8a41 | 3072 | |
9ec055ae DDAG |
3073 | trace_migration_thread_setup_complete(); |
3074 | ||
3075 | while (s->state == MIGRATION_STATUS_ACTIVE || | |
3076 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
a3e879cd | 3077 | int64_t current_time; |
0d82d0e8 | 3078 | |
ad767bed | 3079 | if (urgent || !qemu_file_rate_limit(s->to_dst_file)) { |
2ad87305 PX |
3080 | MigIterateState iter_state = migration_iteration_run(s); |
3081 | if (iter_state == MIG_ITERATE_SKIP) { | |
3082 | continue; | |
3083 | } else if (iter_state == MIG_ITERATE_BREAK) { | |
09f6c85e | 3084 | break; |
c369f40d JQ |
3085 | } |
3086 | } | |
f4410a5d | 3087 | |
b23c2ade PX |
3088 | /* |
3089 | * Try to detect any kind of failures, and see whether we | |
3090 | * should stop the migration now. | |
3091 | */ | |
3092 | thr_error = migration_detect_error(s); | |
3093 | if (thr_error == MIG_THR_ERR_FATAL) { | |
3094 | /* Stop migration */ | |
fd45ee2c | 3095 | break; |
b23c2ade PX |
3096 | } else if (thr_error == MIG_THR_ERR_RECOVERED) { |
3097 | /* | |
3098 | * Just recovered from a e.g. network failure, reset all | |
3099 | * the local variables. This is important to avoid | |
3100 | * breaking transferred_bytes and bandwidth calculation | |
3101 | */ | |
3102 | s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
3103 | s->iteration_initial_bytes = 0; | |
fd45ee2c | 3104 | } |
b15df1ae | 3105 | |
bc72ad67 | 3106 | current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
0d82d0e8 | 3107 | |
b15df1ae PX |
3108 | migration_update_counters(s, current_time); |
3109 | ||
ad767bed | 3110 | urgent = false; |
89a02a9f | 3111 | if (qemu_file_rate_limit(s->to_dst_file)) { |
ad767bed DDAG |
3112 | /* Wait for a delay to do rate limiting OR |
3113 | * something urgent to post the semaphore. | |
3114 | */ | |
3115 | int ms = s->iteration_start_time + BUFFER_DELAY - current_time; | |
3116 | trace_migration_thread_ratelimit_pre(ms); | |
3117 | if (qemu_sem_timedwait(&s->rate_limit_sem, ms) == 0) { | |
3118 | /* We were worken by one or more urgent things but | |
3119 | * the timedwait will have consumed one of them. | |
3120 | * The service routine for the urgent wake will dec | |
3121 | * the semaphore itself for each item it consumes, | |
3122 | * so add this one we just eat back. | |
3123 | */ | |
3124 | qemu_sem_post(&s->rate_limit_sem); | |
3125 | urgent = true; | |
3126 | } | |
3127 | trace_migration_thread_ratelimit_post(urgent); | |
0d82d0e8 | 3128 | } |
a3fa1d78 PB |
3129 | } |
3130 | ||
1d34e4bf | 3131 | trace_migration_thread_after_loop(); |
199aa6d4 | 3132 | migration_iteration_finish(s); |
ab28bd23 | 3133 | rcu_unregister_thread(); |
0d82d0e8 JQ |
3134 | return NULL; |
3135 | } | |
3136 | ||
cce8040b | 3137 | void migrate_fd_connect(MigrationState *s, Error *error_in) |
0d82d0e8 | 3138 | { |
d3e35b8f PX |
3139 | int64_t rate_limit; |
3140 | bool resume = s->state == MIGRATION_STATUS_POSTCOPY_PAUSED; | |
3141 | ||
2ff30257 | 3142 | s->expected_downtime = s->parameters.downtime_limit; |
bb1fadc4 | 3143 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s); |
cce8040b DDAG |
3144 | if (error_in) { |
3145 | migrate_fd_error(s, error_in); | |
3146 | migrate_fd_cleanup(s); | |
3147 | return; | |
3148 | } | |
0d82d0e8 | 3149 | |
d3e35b8f PX |
3150 | if (resume) { |
3151 | /* This is a resumed migration */ | |
3152 | rate_limit = INT64_MAX; | |
3153 | } else { | |
3154 | /* This is a fresh new migration */ | |
3155 | rate_limit = s->parameters.max_bandwidth / XFER_LIMIT_RATIO; | |
442773ce | 3156 | |
d3e35b8f PX |
3157 | /* Notify before starting migration thread */ |
3158 | notifier_list_notify(&migration_state_notifiers, s); | |
3159 | } | |
3160 | ||
3161 | qemu_file_set_rate_limit(s->to_dst_file, rate_limit); | |
3162 | qemu_file_set_blocking(s->to_dst_file, true); | |
9287ac27 | 3163 | |
1d34e4bf | 3164 | /* |
c788ada8 PX |
3165 | * Open the return path. For postcopy, it is used exclusively. For |
3166 | * precopy, only if user specified "return-path" capability would | |
3167 | * QEMU uses the return path. | |
1d34e4bf | 3168 | */ |
c788ada8 | 3169 | if (migrate_postcopy_ram() || migrate_use_return_path()) { |
d3e35b8f | 3170 | if (open_return_path_on_source(s, !resume)) { |
1d34e4bf | 3171 | error_report("Unable to open return-path for postcopy"); |
d3e35b8f | 3172 | migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED); |
1d34e4bf DDAG |
3173 | migrate_fd_cleanup(s); |
3174 | return; | |
3175 | } | |
3176 | } | |
3177 | ||
d3e35b8f | 3178 | if (resume) { |
135b87b4 PX |
3179 | /* Wakeup the main migration thread to do the recovery */ |
3180 | migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_PAUSED, | |
3181 | MIGRATION_STATUS_POSTCOPY_RECOVER); | |
3182 | qemu_sem_post(&s->postcopy_pause_sem); | |
d3e35b8f PX |
3183 | return; |
3184 | } | |
3185 | ||
f986c3d2 JQ |
3186 | if (multifd_save_setup() != 0) { |
3187 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, | |
3188 | MIGRATION_STATUS_FAILED); | |
3189 | migrate_fd_cleanup(s); | |
3190 | return; | |
3191 | } | |
009fad7f | 3192 | qemu_thread_create(&s->thread, "live_migration", migration_thread, s, |
bb1fadc4 | 3193 | QEMU_THREAD_JOINABLE); |
1d34e4bf | 3194 | s->migration_thread_running = true; |
0d82d0e8 | 3195 | } |
093e3c42 | 3196 | |
9d18af93 PX |
3197 | void migration_global_dump(Monitor *mon) |
3198 | { | |
3199 | MigrationState *ms = migrate_get_current(); | |
3200 | ||
6f0f6428 JQ |
3201 | monitor_printf(mon, "globals:\n"); |
3202 | monitor_printf(mon, "store-global-state: %s\n", | |
3203 | ms->store_global_state ? "on" : "off"); | |
3204 | monitor_printf(mon, "only-migratable: %s\n", | |
3205 | ms->only_migratable ? "on" : "off"); | |
3206 | monitor_printf(mon, "send-configuration: %s\n", | |
3207 | ms->send_configuration ? "on" : "off"); | |
3208 | monitor_printf(mon, "send-section-footer: %s\n", | |
3209 | ms->send_section_footer ? "on" : "off"); | |
f548222c XG |
3210 | monitor_printf(mon, "decompress-error-check: %s\n", |
3211 | ms->decompress_error_check ? "on" : "off"); | |
9d18af93 PX |
3212 | } |
3213 | ||
20814758 PX |
3214 | #define DEFINE_PROP_MIG_CAP(name, x) \ |
3215 | DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false) | |
3216 | ||
5272298c PX |
3217 | static Property migration_properties[] = { |
3218 | DEFINE_PROP_BOOL("store-global-state", MigrationState, | |
3219 | store_global_state, true), | |
3df663e5 | 3220 | DEFINE_PROP_BOOL("only-migratable", MigrationState, only_migratable, false), |
71dd4c1a PX |
3221 | DEFINE_PROP_BOOL("send-configuration", MigrationState, |
3222 | send_configuration, true), | |
15c38503 PX |
3223 | DEFINE_PROP_BOOL("send-section-footer", MigrationState, |
3224 | send_section_footer, true), | |
f548222c XG |
3225 | DEFINE_PROP_BOOL("decompress-error-check", MigrationState, |
3226 | decompress_error_check, true), | |
89632faf PX |
3227 | |
3228 | /* Migration parameters */ | |
741d4086 | 3229 | DEFINE_PROP_UINT8("x-compress-level", MigrationState, |
89632faf PX |
3230 | parameters.compress_level, |
3231 | DEFAULT_MIGRATE_COMPRESS_LEVEL), | |
741d4086 | 3232 | DEFINE_PROP_UINT8("x-compress-threads", MigrationState, |
89632faf PX |
3233 | parameters.compress_threads, |
3234 | DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT), | |
1d58872a XG |
3235 | DEFINE_PROP_BOOL("x-compress-wait-thread", MigrationState, |
3236 | parameters.compress_wait_thread, true), | |
741d4086 | 3237 | DEFINE_PROP_UINT8("x-decompress-threads", MigrationState, |
89632faf PX |
3238 | parameters.decompress_threads, |
3239 | DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT), | |
741d4086 | 3240 | DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState, |
89632faf PX |
3241 | parameters.cpu_throttle_initial, |
3242 | DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL), | |
741d4086 | 3243 | DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState, |
89632faf PX |
3244 | parameters.cpu_throttle_increment, |
3245 | DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT), | |
741d4086 | 3246 | DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState, |
89632faf | 3247 | parameters.max_bandwidth, MAX_THROTTLE), |
741d4086 | 3248 | DEFINE_PROP_UINT64("x-downtime-limit", MigrationState, |
89632faf PX |
3249 | parameters.downtime_limit, |
3250 | DEFAULT_MIGRATE_SET_DOWNTIME), | |
741d4086 | 3251 | DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState, |
89632faf PX |
3252 | parameters.x_checkpoint_delay, |
3253 | DEFAULT_MIGRATE_X_CHECKPOINT_DELAY), | |
741d4086 | 3254 | DEFINE_PROP_UINT8("x-multifd-channels", MigrationState, |
4075fb1c JQ |
3255 | parameters.x_multifd_channels, |
3256 | DEFAULT_MIGRATE_MULTIFD_CHANNELS), | |
741d4086 | 3257 | DEFINE_PROP_UINT32("x-multifd-page-count", MigrationState, |
0fb86605 JQ |
3258 | parameters.x_multifd_page_count, |
3259 | DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT), | |
73af8dd8 JQ |
3260 | DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState, |
3261 | parameters.xbzrle_cache_size, | |
3262 | DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE), | |
7e555c6c DDAG |
3263 | DEFINE_PROP_SIZE("max-postcopy-bandwidth", MigrationState, |
3264 | parameters.max_postcopy_bandwidth, | |
3265 | DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH), | |
4cbc9c7f LQ |
3266 | DEFINE_PROP_UINT8("max-cpu-throttle", MigrationState, |
3267 | parameters.max_cpu_throttle, | |
3268 | DEFAULT_MIGRATE_MAX_CPU_THROTTLE), | |
20814758 PX |
3269 | |
3270 | /* Migration capabilities */ | |
3271 | DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE), | |
3272 | DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL), | |
3273 | DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE), | |
3274 | DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS), | |
3275 | DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS), | |
3276 | DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS), | |
3277 | DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM), | |
3278 | DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO), | |
3279 | DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM), | |
3280 | DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK), | |
3281 | DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH), | |
30126bbf | 3282 | DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_X_MULTIFD), |
20814758 | 3283 | |
5272298c PX |
3284 | DEFINE_PROP_END_OF_LIST(), |
3285 | }; | |
3286 | ||
e5cb7e76 PX |
3287 | static void migration_class_init(ObjectClass *klass, void *data) |
3288 | { | |
3289 | DeviceClass *dc = DEVICE_CLASS(klass); | |
3290 | ||
3291 | dc->user_creatable = false; | |
5272298c | 3292 | dc->props = migration_properties; |
e5cb7e76 PX |
3293 | } |
3294 | ||
b91bf5e4 MAL |
3295 | static void migration_instance_finalize(Object *obj) |
3296 | { | |
3297 | MigrationState *ms = MIGRATION_OBJ(obj); | |
3298 | MigrationParameters *params = &ms->parameters; | |
3299 | ||
87db1a7d | 3300 | qemu_mutex_destroy(&ms->error_mutex); |
62df066f | 3301 | qemu_mutex_destroy(&ms->qemu_file_lock); |
b91bf5e4 MAL |
3302 | g_free(params->tls_hostname); |
3303 | g_free(params->tls_creds); | |
ad767bed | 3304 | qemu_sem_destroy(&ms->rate_limit_sem); |
e91d8951 | 3305 | qemu_sem_destroy(&ms->pause_sem); |
b23c2ade | 3306 | qemu_sem_destroy(&ms->postcopy_pause_sem); |
14b1742e | 3307 | qemu_sem_destroy(&ms->postcopy_pause_rp_sem); |
edd090c7 | 3308 | qemu_sem_destroy(&ms->rp_state.rp_sem); |
ab105cc1 | 3309 | error_free(ms->error); |
b91bf5e4 MAL |
3310 | } |
3311 | ||
e5cb7e76 PX |
3312 | static void migration_instance_init(Object *obj) |
3313 | { | |
3314 | MigrationState *ms = MIGRATION_OBJ(obj); | |
8b0b29dc | 3315 | MigrationParameters *params = &ms->parameters; |
e5cb7e76 PX |
3316 | |
3317 | ms->state = MIGRATION_STATUS_NONE; | |
e5cb7e76 | 3318 | ms->mbps = -1; |
e91d8951 | 3319 | qemu_sem_init(&ms->pause_sem, 0); |
87db1a7d | 3320 | qemu_mutex_init(&ms->error_mutex); |
8b0b29dc PX |
3321 | |
3322 | params->tls_hostname = g_strdup(""); | |
3323 | params->tls_creds = g_strdup(""); | |
3324 | ||
3325 | /* Set has_* up only for parameter checks */ | |
3326 | params->has_compress_level = true; | |
3327 | params->has_compress_threads = true; | |
3328 | params->has_decompress_threads = true; | |
3329 | params->has_cpu_throttle_initial = true; | |
3330 | params->has_cpu_throttle_increment = true; | |
3331 | params->has_max_bandwidth = true; | |
3332 | params->has_downtime_limit = true; | |
3333 | params->has_x_checkpoint_delay = true; | |
3334 | params->has_block_incremental = true; | |
4075fb1c | 3335 | params->has_x_multifd_channels = true; |
0fb86605 | 3336 | params->has_x_multifd_page_count = true; |
73af8dd8 | 3337 | params->has_xbzrle_cache_size = true; |
7e555c6c | 3338 | params->has_max_postcopy_bandwidth = true; |
4cbc9c7f | 3339 | params->has_max_cpu_throttle = true; |
b23c2ade PX |
3340 | |
3341 | qemu_sem_init(&ms->postcopy_pause_sem, 0); | |
14b1742e | 3342 | qemu_sem_init(&ms->postcopy_pause_rp_sem, 0); |
edd090c7 | 3343 | qemu_sem_init(&ms->rp_state.rp_sem, 0); |
ad767bed | 3344 | qemu_sem_init(&ms->rate_limit_sem, 0); |
62df066f | 3345 | qemu_mutex_init(&ms->qemu_file_lock); |
8b0b29dc PX |
3346 | } |
3347 | ||
3348 | /* | |
3349 | * Return true if check pass, false otherwise. Error will be put | |
3350 | * inside errp if provided. | |
3351 | */ | |
3352 | static bool migration_object_check(MigrationState *ms, Error **errp) | |
3353 | { | |
6b19a7d9 PX |
3354 | MigrationCapabilityStatusList *head = NULL; |
3355 | /* Assuming all off */ | |
3356 | bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret; | |
3357 | int i; | |
3358 | ||
8b0b29dc PX |
3359 | if (!migrate_params_check(&ms->parameters, errp)) { |
3360 | return false; | |
3361 | } | |
3362 | ||
6b19a7d9 PX |
3363 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { |
3364 | if (ms->enabled_capabilities[i]) { | |
3365 | head = migrate_cap_add(head, i, true); | |
3366 | } | |
3367 | } | |
3368 | ||
3369 | ret = migrate_caps_check(cap_list, head, errp); | |
3370 | ||
3371 | /* It works with head == NULL */ | |
3372 | qapi_free_MigrationCapabilityStatusList(head); | |
3373 | ||
3374 | return ret; | |
e5cb7e76 PX |
3375 | } |
3376 | ||
3377 | static const TypeInfo migration_type = { | |
3378 | .name = TYPE_MIGRATION, | |
01f6e14c | 3379 | /* |
c8d3ff38 PX |
3380 | * NOTE: TYPE_MIGRATION is not really a device, as the object is |
3381 | * not created using qdev_create(), it is not attached to the qdev | |
3382 | * device tree, and it is never realized. | |
3383 | * | |
3384 | * TODO: Make this TYPE_OBJECT once QOM provides something like | |
3385 | * TYPE_DEVICE's "-global" properties. | |
01f6e14c | 3386 | */ |
e5cb7e76 PX |
3387 | .parent = TYPE_DEVICE, |
3388 | .class_init = migration_class_init, | |
3389 | .class_size = sizeof(MigrationClass), | |
3390 | .instance_size = sizeof(MigrationState), | |
3391 | .instance_init = migration_instance_init, | |
b91bf5e4 | 3392 | .instance_finalize = migration_instance_finalize, |
e5cb7e76 PX |
3393 | }; |
3394 | ||
3395 | static void register_migration_types(void) | |
3396 | { | |
3397 | type_register_static(&migration_type); | |
3398 | } | |
3399 | ||
3400 | type_init(register_migration_types); |