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 | * |
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. |
14 | */ |
15 | |
16 | #include "qemu/osdep.h" |
17 | #include "qemu/cutils.h" |
18 | #include "qemu/error-report.h" |
19 | #include "qemu/main-loop.h" |
20 | #include "migration/blocker.h" |
21 | #include "exec.h" |
22 | #include "fd.h" |
23 | #include "socket.h" |
24 | #include "sysemu/runstate.h" |
25 | #include "sysemu/sysemu.h" |
26 | #include "rdma.h" |
27 | #include "ram.h" |
28 | #include "migration/global_state.h" |
29 | #include "migration/misc.h" |
30 | #include "migration.h" |
31 | #include "savevm.h" |
32 | #include "qemu-file-channel.h" |
33 | #include "qemu-file.h" |
34 | #include "migration/vmstate.h" |
35 | #include "block/block.h" |
36 | #include "qapi/error.h" |
37 | #include "qapi/clone-visitor.h" |
38 | #include "qapi/qapi-visit-sockets.h" |
39 | #include "qapi/qapi-commands-migration.h" |
40 | #include "qapi/qapi-events-migration.h" |
41 | #include "qapi/qmp/qerror.h" |
42 | #include "qapi/qmp/qnull.h" |
43 | #include "qemu/rcu.h" |
44 | #include "block.h" |
45 | #include "postcopy-ram.h" |
46 | #include "qemu/thread.h" |
47 | #include "trace.h" |
48 | #include "exec/target_page.h" |
49 | #include "io/channel-buffer.h" |
50 | #include "migration/colo.h" |
51 | #include "hw/boards.h" |
52 | #include "hw/qdev-properties.h" |
53 | #include "monitor/monitor.h" |
54 | #include "net/announce.h" |
55 | |
56 | #define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */ |
57 | |
58 | /* Amount of time to allocate to each "chunk" of bandwidth-throttled |
59 | * data. */ |
60 | #define BUFFER_DELAY 100 |
61 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) |
62 | |
63 | /* Time in milliseconds we are allowed to stop the source, |
64 | * for sending the last part */ |
65 | #define DEFAULT_MIGRATE_SET_DOWNTIME 300 |
66 | |
67 | /* Maximum migrate downtime set to 2000 seconds */ |
68 | #define MAX_MIGRATE_DOWNTIME_SECONDS 2000 |
69 | #define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000) |
70 | |
71 | /* Default compression thread count */ |
72 | #define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8 |
73 | /* Default decompression thread count, usually decompression is at |
74 | * least 4 times as fast as compression.*/ |
75 | #define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2 |
76 | /*0: means nocompress, 1: best speed, ... 9: best compress ratio */ |
77 | #define DEFAULT_MIGRATE_COMPRESS_LEVEL 1 |
78 | /* Define default autoconverge cpu throttle migration parameters */ |
79 | #define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20 |
80 | #define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10 |
81 | #define DEFAULT_MIGRATE_MAX_CPU_THROTTLE 99 |
82 | |
83 | /* Migration XBZRLE default cache size */ |
84 | #define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024) |
85 | |
86 | /* The delay time (in ms) between two COLO checkpoints */ |
87 | #define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY (200 * 100) |
88 | #define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2 |
89 | |
90 | /* Background transfer rate for postcopy, 0 means unlimited, note |
91 | * that page requests can still exceed this limit. |
92 | */ |
93 | #define DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH 0 |
94 | |
95 | /* |
96 | * Parameters for self_announce_delay giving a stream of RARP/ARP |
97 | * packets after migration. |
98 | */ |
99 | #define DEFAULT_MIGRATE_ANNOUNCE_INITIAL 50 |
100 | #define DEFAULT_MIGRATE_ANNOUNCE_MAX 550 |
101 | #define DEFAULT_MIGRATE_ANNOUNCE_ROUNDS 5 |
102 | #define DEFAULT_MIGRATE_ANNOUNCE_STEP 100 |
103 | |
104 | static NotifierList migration_state_notifiers = |
105 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); |
106 | |
107 | static bool deferred_incoming; |
108 | |
109 | /* Messages sent on the return path from destination to source */ |
110 | enum mig_rp_message_type { |
111 | MIG_RP_MSG_INVALID = 0, /* Must be 0 */ |
112 | MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */ |
113 | MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */ |
114 | |
115 | MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */ |
116 | MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */ |
117 | MIG_RP_MSG_RECV_BITMAP, /* send recved_bitmap back to source */ |
118 | MIG_RP_MSG_RESUME_ACK, /* tell source that we are ready to resume */ |
119 | |
120 | MIG_RP_MSG_MAX |
121 | }; |
122 | |
123 | /* When we add fault tolerance, we could have several |
124 | migrations at once. For now we don't need to add |
125 | dynamic creation of migration */ |
126 | |
127 | static MigrationState *current_migration; |
128 | static MigrationIncomingState *current_incoming; |
129 | |
130 | static bool migration_object_check(MigrationState *ms, Error **errp); |
131 | static int migration_maybe_pause(MigrationState *s, |
132 | int *current_active_state, |
133 | int new_state); |
134 | static void migrate_fd_cancel(MigrationState *s); |
135 | |
136 | void migration_object_init(void) |
137 | { |
138 | MachineState *ms = MACHINE(qdev_get_machine()); |
139 | Error *err = NULL; |
140 | |
141 | /* This can only be called once. */ |
142 | assert(!current_migration); |
143 | current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION)); |
144 | |
145 | /* |
146 | * Init the migrate incoming object as well no matter whether |
147 | * we'll use it or not. |
148 | */ |
149 | assert(!current_incoming); |
150 | current_incoming = g_new0(MigrationIncomingState, 1); |
151 | current_incoming->state = MIGRATION_STATUS_NONE; |
152 | current_incoming->postcopy_remote_fds = |
153 | g_array_new(FALSE, TRUE, sizeof(struct PostCopyFD)); |
154 | qemu_mutex_init(¤t_incoming->rp_mutex); |
155 | qemu_event_init(¤t_incoming->main_thread_load_event, false); |
156 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_dst, 0); |
157 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_fault, 0); |
158 | |
159 | init_dirty_bitmap_incoming_migration(); |
160 | |
161 | if (!migration_object_check(current_migration, &err)) { |
162 | error_report_err(err); |
163 | exit(1); |
164 | } |
165 | |
166 | /* |
167 | * We cannot really do this in migration_instance_init() since at |
168 | * that time global properties are not yet applied, then this |
169 | * value will be definitely replaced by something else. |
170 | */ |
171 | if (ms->enforce_config_section) { |
172 | current_migration->send_configuration = true; |
173 | } |
174 | } |
175 | |
176 | void migration_shutdown(void) |
177 | { |
178 | /* |
179 | * Cancel the current migration - that will (eventually) |
180 | * stop the migration using this structure |
181 | */ |
182 | migrate_fd_cancel(current_migration); |
183 | object_unref(OBJECT(current_migration)); |
184 | } |
185 | |
186 | /* For outgoing */ |
187 | MigrationState *migrate_get_current(void) |
188 | { |
189 | /* This can only be called after the object created. */ |
190 | assert(current_migration); |
191 | return current_migration; |
192 | } |
193 | |
194 | MigrationIncomingState *migration_incoming_get_current(void) |
195 | { |
196 | assert(current_incoming); |
197 | return current_incoming; |
198 | } |
199 | |
200 | void migration_incoming_state_destroy(void) |
201 | { |
202 | struct MigrationIncomingState *mis = migration_incoming_get_current(); |
203 | |
204 | if (mis->to_src_file) { |
205 | /* Tell source that we are done */ |
206 | migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0); |
207 | qemu_fclose(mis->to_src_file); |
208 | mis->to_src_file = NULL; |
209 | } |
210 | |
211 | if (mis->from_src_file) { |
212 | qemu_fclose(mis->from_src_file); |
213 | mis->from_src_file = NULL; |
214 | } |
215 | if (mis->postcopy_remote_fds) { |
216 | g_array_free(mis->postcopy_remote_fds, TRUE); |
217 | mis->postcopy_remote_fds = NULL; |
218 | } |
219 | |
220 | qemu_event_reset(&mis->main_thread_load_event); |
221 | |
222 | if (mis->socket_address_list) { |
223 | qapi_free_SocketAddressList(mis->socket_address_list); |
224 | mis->socket_address_list = NULL; |
225 | } |
226 | } |
227 | |
228 | static void migrate_generate_event(int new_state) |
229 | { |
230 | if (migrate_use_events()) { |
231 | qapi_event_send_migration(new_state); |
232 | } |
233 | } |
234 | |
235 | static bool migrate_late_block_activate(void) |
236 | { |
237 | MigrationState *s; |
238 | |
239 | s = migrate_get_current(); |
240 | |
241 | return s->enabled_capabilities[ |
242 | MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE]; |
243 | } |
244 | |
245 | /* |
246 | * Called on -incoming with a defer: uri. |
247 | * The migration can be started later after any parameters have been |
248 | * changed. |
249 | */ |
250 | static void deferred_incoming_migration(Error **errp) |
251 | { |
252 | if (deferred_incoming) { |
253 | error_setg(errp, "Incoming migration already deferred" ); |
254 | } |
255 | deferred_incoming = true; |
256 | } |
257 | |
258 | /* |
259 | * Send a message on the return channel back to the source |
260 | * of the migration. |
261 | */ |
262 | static int migrate_send_rp_message(MigrationIncomingState *mis, |
263 | enum mig_rp_message_type message_type, |
264 | uint16_t len, void *data) |
265 | { |
266 | int ret = 0; |
267 | |
268 | trace_migrate_send_rp_message((int)message_type, len); |
269 | qemu_mutex_lock(&mis->rp_mutex); |
270 | |
271 | /* |
272 | * It's possible that the file handle got lost due to network |
273 | * failures. |
274 | */ |
275 | if (!mis->to_src_file) { |
276 | ret = -EIO; |
277 | goto error; |
278 | } |
279 | |
280 | qemu_put_be16(mis->to_src_file, (unsigned int)message_type); |
281 | qemu_put_be16(mis->to_src_file, len); |
282 | qemu_put_buffer(mis->to_src_file, data, len); |
283 | qemu_fflush(mis->to_src_file); |
284 | |
285 | /* It's possible that qemu file got error during sending */ |
286 | ret = qemu_file_get_error(mis->to_src_file); |
287 | |
288 | error: |
289 | qemu_mutex_unlock(&mis->rp_mutex); |
290 | return ret; |
291 | } |
292 | |
293 | /* Request a range of pages from the source VM at the given |
294 | * start address. |
295 | * rbname: Name of the RAMBlock to request the page in, if NULL it's the same |
296 | * as the last request (a name must have been given previously) |
297 | * Start: Address offset within the RB |
298 | * Len: Length in bytes required - must be a multiple of pagesize |
299 | */ |
300 | int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname, |
301 | ram_addr_t start, size_t len) |
302 | { |
303 | uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ |
304 | size_t msglen = 12; /* start + len */ |
305 | enum mig_rp_message_type msg_type; |
306 | |
307 | *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); |
308 | *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); |
309 | |
310 | if (rbname) { |
311 | int rbname_len = strlen(rbname); |
312 | assert(rbname_len < 256); |
313 | |
314 | bufc[msglen++] = rbname_len; |
315 | memcpy(bufc + msglen, rbname, rbname_len); |
316 | msglen += rbname_len; |
317 | msg_type = MIG_RP_MSG_REQ_PAGES_ID; |
318 | } else { |
319 | msg_type = MIG_RP_MSG_REQ_PAGES; |
320 | } |
321 | |
322 | return migrate_send_rp_message(mis, msg_type, msglen, bufc); |
323 | } |
324 | |
325 | static bool migration_colo_enabled; |
326 | bool migration_incoming_colo_enabled(void) |
327 | { |
328 | return migration_colo_enabled; |
329 | } |
330 | |
331 | void migration_incoming_disable_colo(void) |
332 | { |
333 | migration_colo_enabled = false; |
334 | } |
335 | |
336 | void migration_incoming_enable_colo(void) |
337 | { |
338 | migration_colo_enabled = true; |
339 | } |
340 | |
341 | void migrate_add_address(SocketAddress *address) |
342 | { |
343 | MigrationIncomingState *mis = migration_incoming_get_current(); |
344 | SocketAddressList *addrs; |
345 | |
346 | addrs = g_new0(SocketAddressList, 1); |
347 | addrs->next = mis->socket_address_list; |
348 | mis->socket_address_list = addrs; |
349 | addrs->value = QAPI_CLONE(SocketAddress, address); |
350 | } |
351 | |
352 | void qemu_start_incoming_migration(const char *uri, Error **errp) |
353 | { |
354 | const char *p; |
355 | |
356 | qapi_event_send_migration(MIGRATION_STATUS_SETUP); |
357 | if (!strcmp(uri, "defer" )) { |
358 | deferred_incoming_migration(errp); |
359 | } else if (strstart(uri, "tcp:" , &p)) { |
360 | tcp_start_incoming_migration(p, errp); |
361 | #ifdef CONFIG_RDMA |
362 | } else if (strstart(uri, "rdma:" , &p)) { |
363 | rdma_start_incoming_migration(p, errp); |
364 | #endif |
365 | } else if (strstart(uri, "exec:" , &p)) { |
366 | exec_start_incoming_migration(p, errp); |
367 | } else if (strstart(uri, "unix:" , &p)) { |
368 | unix_start_incoming_migration(p, errp); |
369 | } else if (strstart(uri, "fd:" , &p)) { |
370 | fd_start_incoming_migration(p, errp); |
371 | } else { |
372 | error_setg(errp, "unknown migration protocol: %s" , uri); |
373 | } |
374 | } |
375 | |
376 | static void process_incoming_migration_bh(void *opaque) |
377 | { |
378 | Error *local_err = NULL; |
379 | MigrationIncomingState *mis = opaque; |
380 | |
381 | /* If capability late_block_activate is set: |
382 | * Only fire up the block code now if we're going to restart the |
383 | * VM, else 'cont' will do it. |
384 | * This causes file locking to happen; so we don't want it to happen |
385 | * unless we really are starting the VM. |
386 | */ |
387 | if (!migrate_late_block_activate() || |
388 | (autostart && (!global_state_received() || |
389 | global_state_get_runstate() == RUN_STATE_RUNNING))) { |
390 | /* Make sure all file formats flush their mutable metadata. |
391 | * If we get an error here, just don't restart the VM yet. */ |
392 | bdrv_invalidate_cache_all(&local_err); |
393 | if (local_err) { |
394 | error_report_err(local_err); |
395 | local_err = NULL; |
396 | autostart = false; |
397 | } |
398 | } |
399 | |
400 | /* |
401 | * This must happen after all error conditions are dealt with and |
402 | * we're sure the VM is going to be running on this host. |
403 | */ |
404 | qemu_announce_self(&mis->announce_timer, migrate_announce_params()); |
405 | |
406 | if (multifd_load_cleanup(&local_err) != 0) { |
407 | error_report_err(local_err); |
408 | autostart = false; |
409 | } |
410 | /* If global state section was not received or we are in running |
411 | state, we need to obey autostart. Any other state is set with |
412 | runstate_set. */ |
413 | |
414 | dirty_bitmap_mig_before_vm_start(); |
415 | |
416 | if (!global_state_received() || |
417 | global_state_get_runstate() == RUN_STATE_RUNNING) { |
418 | if (autostart) { |
419 | vm_start(); |
420 | } else { |
421 | runstate_set(RUN_STATE_PAUSED); |
422 | } |
423 | } else if (migration_incoming_colo_enabled()) { |
424 | migration_incoming_disable_colo(); |
425 | vm_start(); |
426 | } else { |
427 | runstate_set(global_state_get_runstate()); |
428 | } |
429 | /* |
430 | * This must happen after any state changes since as soon as an external |
431 | * observer sees this event they might start to prod at the VM assuming |
432 | * it's ready to use. |
433 | */ |
434 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, |
435 | MIGRATION_STATUS_COMPLETED); |
436 | qemu_bh_delete(mis->bh); |
437 | migration_incoming_state_destroy(); |
438 | } |
439 | |
440 | static void process_incoming_migration_co(void *opaque) |
441 | { |
442 | MigrationIncomingState *mis = migration_incoming_get_current(); |
443 | PostcopyState ps; |
444 | int ret; |
445 | Error *local_err = NULL; |
446 | |
447 | assert(mis->from_src_file); |
448 | mis->migration_incoming_co = qemu_coroutine_self(); |
449 | mis->largest_page_size = qemu_ram_pagesize_largest(); |
450 | postcopy_state_set(POSTCOPY_INCOMING_NONE); |
451 | migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, |
452 | MIGRATION_STATUS_ACTIVE); |
453 | ret = qemu_loadvm_state(mis->from_src_file); |
454 | |
455 | ps = postcopy_state_get(); |
456 | trace_process_incoming_migration_co_end(ret, ps); |
457 | if (ps != POSTCOPY_INCOMING_NONE) { |
458 | if (ps == POSTCOPY_INCOMING_ADVISE) { |
459 | /* |
460 | * Where a migration had postcopy enabled (and thus went to advise) |
461 | * but managed to complete within the precopy period, we can use |
462 | * the normal exit. |
463 | */ |
464 | postcopy_ram_incoming_cleanup(mis); |
465 | } else if (ret >= 0) { |
466 | /* |
467 | * Postcopy was started, cleanup should happen at the end of the |
468 | * postcopy thread. |
469 | */ |
470 | trace_process_incoming_migration_co_postcopy_end_main(); |
471 | return; |
472 | } |
473 | /* Else if something went wrong then just fall out of the normal exit */ |
474 | } |
475 | |
476 | /* we get COLO info, and know if we are in COLO mode */ |
477 | if (!ret && migration_incoming_colo_enabled()) { |
478 | /* Make sure all file formats flush their mutable metadata */ |
479 | bdrv_invalidate_cache_all(&local_err); |
480 | if (local_err) { |
481 | error_report_err(local_err); |
482 | goto fail; |
483 | } |
484 | |
485 | if (colo_init_ram_cache() < 0) { |
486 | error_report("Init ram cache failed" ); |
487 | goto fail; |
488 | } |
489 | |
490 | qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming" , |
491 | colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE); |
492 | mis->have_colo_incoming_thread = true; |
493 | qemu_coroutine_yield(); |
494 | |
495 | /* Wait checkpoint incoming thread exit before free resource */ |
496 | qemu_thread_join(&mis->colo_incoming_thread); |
497 | /* We hold the global iothread lock, so it is safe here */ |
498 | colo_release_ram_cache(); |
499 | } |
500 | |
501 | if (ret < 0) { |
502 | error_report("load of migration failed: %s" , strerror(-ret)); |
503 | goto fail; |
504 | } |
505 | mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); |
506 | qemu_bh_schedule(mis->bh); |
507 | mis->migration_incoming_co = NULL; |
508 | return; |
509 | fail: |
510 | local_err = NULL; |
511 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, |
512 | MIGRATION_STATUS_FAILED); |
513 | qemu_fclose(mis->from_src_file); |
514 | if (multifd_load_cleanup(&local_err) != 0) { |
515 | error_report_err(local_err); |
516 | } |
517 | exit(EXIT_FAILURE); |
518 | } |
519 | |
520 | static void migration_incoming_setup(QEMUFile *f) |
521 | { |
522 | MigrationIncomingState *mis = migration_incoming_get_current(); |
523 | |
524 | if (multifd_load_setup() != 0) { |
525 | /* We haven't been able to create multifd threads |
526 | nothing better to do */ |
527 | exit(EXIT_FAILURE); |
528 | } |
529 | |
530 | if (!mis->from_src_file) { |
531 | mis->from_src_file = f; |
532 | } |
533 | qemu_file_set_blocking(f, false); |
534 | } |
535 | |
536 | void migration_incoming_process(void) |
537 | { |
538 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL); |
539 | qemu_coroutine_enter(co); |
540 | } |
541 | |
542 | /* Returns true if recovered from a paused migration, otherwise false */ |
543 | static bool postcopy_try_recover(QEMUFile *f) |
544 | { |
545 | MigrationIncomingState *mis = migration_incoming_get_current(); |
546 | |
547 | if (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { |
548 | /* Resumed from a paused postcopy migration */ |
549 | |
550 | mis->from_src_file = f; |
551 | /* Postcopy has standalone thread to do vm load */ |
552 | qemu_file_set_blocking(f, true); |
553 | |
554 | /* Re-configure the return path */ |
555 | mis->to_src_file = qemu_file_get_return_path(f); |
556 | |
557 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_PAUSED, |
558 | MIGRATION_STATUS_POSTCOPY_RECOVER); |
559 | |
560 | /* |
561 | * Here, we only wake up the main loading thread (while the |
562 | * fault thread will still be waiting), so that we can receive |
563 | * commands from source now, and answer it if needed. The |
564 | * fault thread will be woken up afterwards until we are sure |
565 | * that source is ready to reply to page requests. |
566 | */ |
567 | qemu_sem_post(&mis->postcopy_pause_sem_dst); |
568 | return true; |
569 | } |
570 | |
571 | return false; |
572 | } |
573 | |
574 | void migration_fd_process_incoming(QEMUFile *f) |
575 | { |
576 | if (postcopy_try_recover(f)) { |
577 | return; |
578 | } |
579 | |
580 | migration_incoming_setup(f); |
581 | migration_incoming_process(); |
582 | } |
583 | |
584 | void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp) |
585 | { |
586 | MigrationIncomingState *mis = migration_incoming_get_current(); |
587 | bool start_migration; |
588 | |
589 | if (!mis->from_src_file) { |
590 | /* The first connection (multifd may have multiple) */ |
591 | QEMUFile *f = qemu_fopen_channel_input(ioc); |
592 | |
593 | /* If it's a recovery, we're done */ |
594 | if (postcopy_try_recover(f)) { |
595 | return; |
596 | } |
597 | |
598 | migration_incoming_setup(f); |
599 | |
600 | /* |
601 | * Common migration only needs one channel, so we can start |
602 | * right now. Multifd needs more than one channel, we wait. |
603 | */ |
604 | start_migration = !migrate_use_multifd(); |
605 | } else { |
606 | Error *local_err = NULL; |
607 | /* Multiple connections */ |
608 | assert(migrate_use_multifd()); |
609 | start_migration = multifd_recv_new_channel(ioc, &local_err); |
610 | if (local_err) { |
611 | error_propagate(errp, local_err); |
612 | return; |
613 | } |
614 | } |
615 | |
616 | if (start_migration) { |
617 | migration_incoming_process(); |
618 | } |
619 | } |
620 | |
621 | /** |
622 | * @migration_has_all_channels: We have received all channels that we need |
623 | * |
624 | * Returns true when we have got connections to all the channels that |
625 | * we need for migration. |
626 | */ |
627 | bool migration_has_all_channels(void) |
628 | { |
629 | MigrationIncomingState *mis = migration_incoming_get_current(); |
630 | bool all_channels; |
631 | |
632 | all_channels = multifd_recv_all_channels_created(); |
633 | |
634 | return all_channels && mis->from_src_file != NULL; |
635 | } |
636 | |
637 | /* |
638 | * Send a 'SHUT' message on the return channel with the given value |
639 | * to indicate that we've finished with the RP. Non-0 value indicates |
640 | * error. |
641 | */ |
642 | void migrate_send_rp_shut(MigrationIncomingState *mis, |
643 | uint32_t value) |
644 | { |
645 | uint32_t buf; |
646 | |
647 | buf = cpu_to_be32(value); |
648 | migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); |
649 | } |
650 | |
651 | /* |
652 | * Send a 'PONG' message on the return channel with the given value |
653 | * (normally in response to a 'PING') |
654 | */ |
655 | void migrate_send_rp_pong(MigrationIncomingState *mis, |
656 | uint32_t value) |
657 | { |
658 | uint32_t buf; |
659 | |
660 | buf = cpu_to_be32(value); |
661 | migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); |
662 | } |
663 | |
664 | void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis, |
665 | char *block_name) |
666 | { |
667 | char buf[512]; |
668 | int len; |
669 | int64_t res; |
670 | |
671 | /* |
672 | * First, we send the header part. It contains only the len of |
673 | * idstr, and the idstr itself. |
674 | */ |
675 | len = strlen(block_name); |
676 | buf[0] = len; |
677 | memcpy(buf + 1, block_name, len); |
678 | |
679 | if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) { |
680 | error_report("%s: MSG_RP_RECV_BITMAP only used for recovery" , |
681 | __func__); |
682 | return; |
683 | } |
684 | |
685 | migrate_send_rp_message(mis, MIG_RP_MSG_RECV_BITMAP, len + 1, buf); |
686 | |
687 | /* |
688 | * Next, we dump the received bitmap to the stream. |
689 | * |
690 | * TODO: currently we are safe since we are the only one that is |
691 | * using the to_src_file handle (fault thread is still paused), |
692 | * and it's ok even not taking the mutex. However the best way is |
693 | * to take the lock before sending the message header, and release |
694 | * the lock after sending the bitmap. |
695 | */ |
696 | qemu_mutex_lock(&mis->rp_mutex); |
697 | res = ramblock_recv_bitmap_send(mis->to_src_file, block_name); |
698 | qemu_mutex_unlock(&mis->rp_mutex); |
699 | |
700 | trace_migrate_send_rp_recv_bitmap(block_name, res); |
701 | } |
702 | |
703 | void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value) |
704 | { |
705 | uint32_t buf; |
706 | |
707 | buf = cpu_to_be32(value); |
708 | migrate_send_rp_message(mis, MIG_RP_MSG_RESUME_ACK, sizeof(buf), &buf); |
709 | } |
710 | |
711 | MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) |
712 | { |
713 | MigrationCapabilityStatusList *head = NULL; |
714 | MigrationCapabilityStatusList *caps; |
715 | MigrationState *s = migrate_get_current(); |
716 | int i; |
717 | |
718 | caps = NULL; /* silence compiler warning */ |
719 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { |
720 | #ifndef CONFIG_LIVE_BLOCK_MIGRATION |
721 | if (i == MIGRATION_CAPABILITY_BLOCK) { |
722 | continue; |
723 | } |
724 | #endif |
725 | if (head == NULL) { |
726 | head = g_malloc0(sizeof(*caps)); |
727 | caps = head; |
728 | } else { |
729 | caps->next = g_malloc0(sizeof(*caps)); |
730 | caps = caps->next; |
731 | } |
732 | caps->value = |
733 | g_malloc(sizeof(*caps->value)); |
734 | caps->value->capability = i; |
735 | caps->value->state = s->enabled_capabilities[i]; |
736 | } |
737 | |
738 | return head; |
739 | } |
740 | |
741 | MigrationParameters *qmp_query_migrate_parameters(Error **errp) |
742 | { |
743 | MigrationParameters *params; |
744 | MigrationState *s = migrate_get_current(); |
745 | |
746 | /* TODO use QAPI_CLONE() instead of duplicating it inline */ |
747 | params = g_malloc0(sizeof(*params)); |
748 | params->has_compress_level = true; |
749 | params->compress_level = s->parameters.compress_level; |
750 | params->has_compress_threads = true; |
751 | params->compress_threads = s->parameters.compress_threads; |
752 | params->has_compress_wait_thread = true; |
753 | params->compress_wait_thread = s->parameters.compress_wait_thread; |
754 | params->has_decompress_threads = true; |
755 | params->decompress_threads = s->parameters.decompress_threads; |
756 | params->has_cpu_throttle_initial = true; |
757 | params->cpu_throttle_initial = s->parameters.cpu_throttle_initial; |
758 | params->has_cpu_throttle_increment = true; |
759 | params->cpu_throttle_increment = s->parameters.cpu_throttle_increment; |
760 | params->has_tls_creds = true; |
761 | params->tls_creds = g_strdup(s->parameters.tls_creds); |
762 | params->has_tls_hostname = true; |
763 | params->tls_hostname = g_strdup(s->parameters.tls_hostname); |
764 | params->has_tls_authz = true; |
765 | params->tls_authz = g_strdup(s->parameters.tls_authz); |
766 | params->has_max_bandwidth = true; |
767 | params->max_bandwidth = s->parameters.max_bandwidth; |
768 | params->has_downtime_limit = true; |
769 | params->downtime_limit = s->parameters.downtime_limit; |
770 | params->has_x_checkpoint_delay = true; |
771 | params->x_checkpoint_delay = s->parameters.x_checkpoint_delay; |
772 | params->has_block_incremental = true; |
773 | params->block_incremental = s->parameters.block_incremental; |
774 | params->has_multifd_channels = true; |
775 | params->multifd_channels = s->parameters.multifd_channels; |
776 | params->has_xbzrle_cache_size = true; |
777 | params->xbzrle_cache_size = s->parameters.xbzrle_cache_size; |
778 | params->has_max_postcopy_bandwidth = true; |
779 | params->max_postcopy_bandwidth = s->parameters.max_postcopy_bandwidth; |
780 | params->has_max_cpu_throttle = true; |
781 | params->max_cpu_throttle = s->parameters.max_cpu_throttle; |
782 | params->has_announce_initial = true; |
783 | params->announce_initial = s->parameters.announce_initial; |
784 | params->has_announce_max = true; |
785 | params->announce_max = s->parameters.announce_max; |
786 | params->has_announce_rounds = true; |
787 | params->announce_rounds = s->parameters.announce_rounds; |
788 | params->has_announce_step = true; |
789 | params->announce_step = s->parameters.announce_step; |
790 | |
791 | return params; |
792 | } |
793 | |
794 | AnnounceParameters *migrate_announce_params(void) |
795 | { |
796 | static AnnounceParameters ap; |
797 | |
798 | MigrationState *s = migrate_get_current(); |
799 | |
800 | ap.initial = s->parameters.announce_initial; |
801 | ap.max = s->parameters.announce_max; |
802 | ap.rounds = s->parameters.announce_rounds; |
803 | ap.step = s->parameters.announce_step; |
804 | |
805 | return ≈ |
806 | } |
807 | |
808 | /* |
809 | * Return true if we're already in the middle of a migration |
810 | * (i.e. any of the active or setup states) |
811 | */ |
812 | bool migration_is_setup_or_active(int state) |
813 | { |
814 | switch (state) { |
815 | case MIGRATION_STATUS_ACTIVE: |
816 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
817 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
818 | case MIGRATION_STATUS_POSTCOPY_RECOVER: |
819 | case MIGRATION_STATUS_SETUP: |
820 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
821 | case MIGRATION_STATUS_DEVICE: |
822 | return true; |
823 | |
824 | default: |
825 | return false; |
826 | |
827 | } |
828 | } |
829 | |
830 | static void populate_time_info(MigrationInfo *info, MigrationState *s) |
831 | { |
832 | info->has_status = true; |
833 | info->has_setup_time = true; |
834 | info->setup_time = s->setup_time; |
835 | if (s->state == MIGRATION_STATUS_COMPLETED) { |
836 | info->has_total_time = true; |
837 | info->total_time = s->total_time; |
838 | info->has_downtime = true; |
839 | info->downtime = s->downtime; |
840 | } else { |
841 | info->has_total_time = true; |
842 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - |
843 | s->start_time; |
844 | info->has_expected_downtime = true; |
845 | info->expected_downtime = s->expected_downtime; |
846 | } |
847 | } |
848 | |
849 | static void populate_ram_info(MigrationInfo *info, MigrationState *s) |
850 | { |
851 | info->has_ram = true; |
852 | info->ram = g_malloc0(sizeof(*info->ram)); |
853 | info->ram->transferred = ram_counters.transferred; |
854 | info->ram->total = ram_bytes_total(); |
855 | info->ram->duplicate = ram_counters.duplicate; |
856 | /* legacy value. It is not used anymore */ |
857 | info->ram->skipped = 0; |
858 | info->ram->normal = ram_counters.normal; |
859 | info->ram->normal_bytes = ram_counters.normal * |
860 | qemu_target_page_size(); |
861 | info->ram->mbps = s->mbps; |
862 | info->ram->dirty_sync_count = ram_counters.dirty_sync_count; |
863 | info->ram->postcopy_requests = ram_counters.postcopy_requests; |
864 | info->ram->page_size = qemu_target_page_size(); |
865 | info->ram->multifd_bytes = ram_counters.multifd_bytes; |
866 | info->ram->pages_per_second = s->pages_per_second; |
867 | |
868 | if (migrate_use_xbzrle()) { |
869 | info->has_xbzrle_cache = true; |
870 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); |
871 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); |
872 | info->xbzrle_cache->bytes = xbzrle_counters.bytes; |
873 | info->xbzrle_cache->pages = xbzrle_counters.pages; |
874 | info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss; |
875 | info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate; |
876 | info->xbzrle_cache->overflow = xbzrle_counters.overflow; |
877 | } |
878 | |
879 | if (migrate_use_compression()) { |
880 | info->has_compression = true; |
881 | info->compression = g_malloc0(sizeof(*info->compression)); |
882 | info->compression->pages = compression_counters.pages; |
883 | info->compression->busy = compression_counters.busy; |
884 | info->compression->busy_rate = compression_counters.busy_rate; |
885 | info->compression->compressed_size = |
886 | compression_counters.compressed_size; |
887 | info->compression->compression_rate = |
888 | compression_counters.compression_rate; |
889 | } |
890 | |
891 | if (cpu_throttle_active()) { |
892 | info->has_cpu_throttle_percentage = true; |
893 | info->cpu_throttle_percentage = cpu_throttle_get_percentage(); |
894 | } |
895 | |
896 | if (s->state != MIGRATION_STATUS_COMPLETED) { |
897 | info->ram->remaining = ram_bytes_remaining(); |
898 | info->ram->dirty_pages_rate = ram_counters.dirty_pages_rate; |
899 | } |
900 | } |
901 | |
902 | static void populate_disk_info(MigrationInfo *info) |
903 | { |
904 | if (blk_mig_active()) { |
905 | info->has_disk = true; |
906 | info->disk = g_malloc0(sizeof(*info->disk)); |
907 | info->disk->transferred = blk_mig_bytes_transferred(); |
908 | info->disk->remaining = blk_mig_bytes_remaining(); |
909 | info->disk->total = blk_mig_bytes_total(); |
910 | } |
911 | } |
912 | |
913 | static void fill_source_migration_info(MigrationInfo *info) |
914 | { |
915 | MigrationState *s = migrate_get_current(); |
916 | |
917 | switch (s->state) { |
918 | case MIGRATION_STATUS_NONE: |
919 | /* no migration has happened ever */ |
920 | /* do not overwrite destination migration status */ |
921 | return; |
922 | break; |
923 | case MIGRATION_STATUS_SETUP: |
924 | info->has_status = true; |
925 | info->has_total_time = false; |
926 | break; |
927 | case MIGRATION_STATUS_ACTIVE: |
928 | case MIGRATION_STATUS_CANCELLING: |
929 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
930 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
931 | case MIGRATION_STATUS_DEVICE: |
932 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
933 | case MIGRATION_STATUS_POSTCOPY_RECOVER: |
934 | /* TODO add some postcopy stats */ |
935 | populate_time_info(info, s); |
936 | populate_ram_info(info, s); |
937 | populate_disk_info(info); |
938 | break; |
939 | case MIGRATION_STATUS_COLO: |
940 | info->has_status = true; |
941 | /* TODO: display COLO specific information (checkpoint info etc.) */ |
942 | break; |
943 | case MIGRATION_STATUS_COMPLETED: |
944 | populate_time_info(info, s); |
945 | populate_ram_info(info, s); |
946 | break; |
947 | case MIGRATION_STATUS_FAILED: |
948 | info->has_status = true; |
949 | if (s->error) { |
950 | info->has_error_desc = true; |
951 | info->error_desc = g_strdup(error_get_pretty(s->error)); |
952 | } |
953 | break; |
954 | case MIGRATION_STATUS_CANCELLED: |
955 | info->has_status = true; |
956 | break; |
957 | } |
958 | info->status = s->state; |
959 | } |
960 | |
961 | /** |
962 | * @migration_caps_check - check capability validity |
963 | * |
964 | * @cap_list: old capability list, array of bool |
965 | * @params: new capabilities to be applied soon |
966 | * @errp: set *errp if the check failed, with reason |
967 | * |
968 | * Returns true if check passed, otherwise false. |
969 | */ |
970 | static bool migrate_caps_check(bool *cap_list, |
971 | MigrationCapabilityStatusList *params, |
972 | Error **errp) |
973 | { |
974 | MigrationCapabilityStatusList *cap; |
975 | bool old_postcopy_cap; |
976 | MigrationIncomingState *mis = migration_incoming_get_current(); |
977 | |
978 | old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]; |
979 | |
980 | for (cap = params; cap; cap = cap->next) { |
981 | cap_list[cap->value->capability] = cap->value->state; |
982 | } |
983 | |
984 | #ifndef CONFIG_LIVE_BLOCK_MIGRATION |
985 | if (cap_list[MIGRATION_CAPABILITY_BLOCK]) { |
986 | error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) " |
987 | "block migration" ); |
988 | error_append_hint(errp, "Use drive_mirror+NBD instead.\n" ); |
989 | return false; |
990 | } |
991 | #endif |
992 | |
993 | #ifndef CONFIG_REPLICATION |
994 | if (cap_list[MIGRATION_CAPABILITY_X_COLO]) { |
995 | error_setg(errp, "QEMU compiled without replication module" |
996 | " can't enable COLO" ); |
997 | error_append_hint(errp, "Please enable replication before COLO.\n" ); |
998 | return false; |
999 | } |
1000 | #endif |
1001 | |
1002 | if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) { |
1003 | if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) { |
1004 | /* The decompression threads asynchronously write into RAM |
1005 | * rather than use the atomic copies needed to avoid |
1006 | * userfaulting. It should be possible to fix the decompression |
1007 | * threads for compatibility in future. |
1008 | */ |
1009 | error_setg(errp, "Postcopy is not currently compatible " |
1010 | "with compression" ); |
1011 | return false; |
1012 | } |
1013 | |
1014 | /* This check is reasonably expensive, so only when it's being |
1015 | * set the first time, also it's only the destination that needs |
1016 | * special support. |
1017 | */ |
1018 | if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) && |
1019 | !postcopy_ram_supported_by_host(mis)) { |
1020 | /* postcopy_ram_supported_by_host will have emitted a more |
1021 | * detailed message |
1022 | */ |
1023 | error_setg(errp, "Postcopy is not supported" ); |
1024 | return false; |
1025 | } |
1026 | |
1027 | if (cap_list[MIGRATION_CAPABILITY_X_IGNORE_SHARED]) { |
1028 | error_setg(errp, "Postcopy is not compatible with ignore-shared" ); |
1029 | return false; |
1030 | } |
1031 | } |
1032 | |
1033 | return true; |
1034 | } |
1035 | |
1036 | static void fill_destination_migration_info(MigrationInfo *info) |
1037 | { |
1038 | MigrationIncomingState *mis = migration_incoming_get_current(); |
1039 | |
1040 | if (mis->socket_address_list) { |
1041 | info->has_socket_address = true; |
1042 | info->socket_address = |
1043 | QAPI_CLONE(SocketAddressList, mis->socket_address_list); |
1044 | } |
1045 | |
1046 | switch (mis->state) { |
1047 | case MIGRATION_STATUS_NONE: |
1048 | return; |
1049 | break; |
1050 | case MIGRATION_STATUS_SETUP: |
1051 | case MIGRATION_STATUS_CANCELLING: |
1052 | case MIGRATION_STATUS_CANCELLED: |
1053 | case MIGRATION_STATUS_ACTIVE: |
1054 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
1055 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
1056 | case MIGRATION_STATUS_POSTCOPY_RECOVER: |
1057 | case MIGRATION_STATUS_FAILED: |
1058 | case MIGRATION_STATUS_COLO: |
1059 | info->has_status = true; |
1060 | break; |
1061 | case MIGRATION_STATUS_COMPLETED: |
1062 | info->has_status = true; |
1063 | fill_destination_postcopy_migration_info(info); |
1064 | break; |
1065 | } |
1066 | info->status = mis->state; |
1067 | } |
1068 | |
1069 | MigrationInfo *qmp_query_migrate(Error **errp) |
1070 | { |
1071 | MigrationInfo *info = g_malloc0(sizeof(*info)); |
1072 | |
1073 | fill_destination_migration_info(info); |
1074 | fill_source_migration_info(info); |
1075 | |
1076 | return info; |
1077 | } |
1078 | |
1079 | void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, |
1080 | Error **errp) |
1081 | { |
1082 | MigrationState *s = migrate_get_current(); |
1083 | MigrationCapabilityStatusList *cap; |
1084 | bool cap_list[MIGRATION_CAPABILITY__MAX]; |
1085 | |
1086 | if (migration_is_setup_or_active(s->state)) { |
1087 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
1088 | return; |
1089 | } |
1090 | |
1091 | memcpy(cap_list, s->enabled_capabilities, sizeof(cap_list)); |
1092 | if (!migrate_caps_check(cap_list, params, errp)) { |
1093 | return; |
1094 | } |
1095 | |
1096 | for (cap = params; cap; cap = cap->next) { |
1097 | s->enabled_capabilities[cap->value->capability] = cap->value->state; |
1098 | } |
1099 | } |
1100 | |
1101 | /* |
1102 | * Check whether the parameters are valid. Error will be put into errp |
1103 | * (if provided). Return true if valid, otherwise false. |
1104 | */ |
1105 | static bool migrate_params_check(MigrationParameters *params, Error **errp) |
1106 | { |
1107 | if (params->has_compress_level && |
1108 | (params->compress_level > 9)) { |
1109 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level" , |
1110 | "is invalid, it should be in the range of 0 to 9" ); |
1111 | return false; |
1112 | } |
1113 | |
1114 | if (params->has_compress_threads && (params->compress_threads < 1)) { |
1115 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1116 | "compress_threads" , |
1117 | "is invalid, it should be in the range of 1 to 255" ); |
1118 | return false; |
1119 | } |
1120 | |
1121 | if (params->has_decompress_threads && (params->decompress_threads < 1)) { |
1122 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1123 | "decompress_threads" , |
1124 | "is invalid, it should be in the range of 1 to 255" ); |
1125 | return false; |
1126 | } |
1127 | |
1128 | if (params->has_cpu_throttle_initial && |
1129 | (params->cpu_throttle_initial < 1 || |
1130 | params->cpu_throttle_initial > 99)) { |
1131 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1132 | "cpu_throttle_initial" , |
1133 | "an integer in the range of 1 to 99" ); |
1134 | return false; |
1135 | } |
1136 | |
1137 | if (params->has_cpu_throttle_increment && |
1138 | (params->cpu_throttle_increment < 1 || |
1139 | params->cpu_throttle_increment > 99)) { |
1140 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1141 | "cpu_throttle_increment" , |
1142 | "an integer in the range of 1 to 99" ); |
1143 | return false; |
1144 | } |
1145 | |
1146 | if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) { |
1147 | error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the" |
1148 | " range of 0 to %zu bytes/second" , SIZE_MAX); |
1149 | return false; |
1150 | } |
1151 | |
1152 | if (params->has_downtime_limit && |
1153 | (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) { |
1154 | error_setg(errp, "Parameter 'downtime_limit' expects an integer in " |
1155 | "the range of 0 to %d milliseconds" , |
1156 | MAX_MIGRATE_DOWNTIME); |
1157 | return false; |
1158 | } |
1159 | |
1160 | /* x_checkpoint_delay is now always positive */ |
1161 | |
1162 | if (params->has_multifd_channels && (params->multifd_channels < 1)) { |
1163 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1164 | "multifd_channels" , |
1165 | "is invalid, it should be in the range of 1 to 255" ); |
1166 | return false; |
1167 | } |
1168 | |
1169 | if (params->has_xbzrle_cache_size && |
1170 | (params->xbzrle_cache_size < qemu_target_page_size() || |
1171 | !is_power_of_2(params->xbzrle_cache_size))) { |
1172 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1173 | "xbzrle_cache_size" , |
1174 | "is invalid, it should be bigger than target page size" |
1175 | " and a power of two" ); |
1176 | return false; |
1177 | } |
1178 | |
1179 | if (params->has_max_cpu_throttle && |
1180 | (params->max_cpu_throttle < params->cpu_throttle_initial || |
1181 | params->max_cpu_throttle > 99)) { |
1182 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1183 | "max_cpu_throttle" , |
1184 | "an integer in the range of cpu_throttle_initial to 99" ); |
1185 | return false; |
1186 | } |
1187 | |
1188 | if (params->has_announce_initial && |
1189 | params->announce_initial > 100000) { |
1190 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1191 | "announce_initial" , |
1192 | "is invalid, it must be less than 100000 ms" ); |
1193 | return false; |
1194 | } |
1195 | if (params->has_announce_max && |
1196 | params->announce_max > 100000) { |
1197 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1198 | "announce_max" , |
1199 | "is invalid, it must be less than 100000 ms" ); |
1200 | return false; |
1201 | } |
1202 | if (params->has_announce_rounds && |
1203 | params->announce_rounds > 1000) { |
1204 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1205 | "announce_rounds" , |
1206 | "is invalid, it must be in the range of 0 to 1000" ); |
1207 | return false; |
1208 | } |
1209 | if (params->has_announce_step && |
1210 | (params->announce_step < 1 || |
1211 | params->announce_step > 10000)) { |
1212 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, |
1213 | "announce_step" , |
1214 | "is invalid, it must be in the range of 1 to 10000 ms" ); |
1215 | return false; |
1216 | } |
1217 | return true; |
1218 | } |
1219 | |
1220 | static void migrate_params_test_apply(MigrateSetParameters *params, |
1221 | MigrationParameters *dest) |
1222 | { |
1223 | *dest = migrate_get_current()->parameters; |
1224 | |
1225 | /* TODO use QAPI_CLONE() instead of duplicating it inline */ |
1226 | |
1227 | if (params->has_compress_level) { |
1228 | dest->compress_level = params->compress_level; |
1229 | } |
1230 | |
1231 | if (params->has_compress_threads) { |
1232 | dest->compress_threads = params->compress_threads; |
1233 | } |
1234 | |
1235 | if (params->has_compress_wait_thread) { |
1236 | dest->compress_wait_thread = params->compress_wait_thread; |
1237 | } |
1238 | |
1239 | if (params->has_decompress_threads) { |
1240 | dest->decompress_threads = params->decompress_threads; |
1241 | } |
1242 | |
1243 | if (params->has_cpu_throttle_initial) { |
1244 | dest->cpu_throttle_initial = params->cpu_throttle_initial; |
1245 | } |
1246 | |
1247 | if (params->has_cpu_throttle_increment) { |
1248 | dest->cpu_throttle_increment = params->cpu_throttle_increment; |
1249 | } |
1250 | |
1251 | if (params->has_tls_creds) { |
1252 | assert(params->tls_creds->type == QTYPE_QSTRING); |
1253 | dest->tls_creds = g_strdup(params->tls_creds->u.s); |
1254 | } |
1255 | |
1256 | if (params->has_tls_hostname) { |
1257 | assert(params->tls_hostname->type == QTYPE_QSTRING); |
1258 | dest->tls_hostname = g_strdup(params->tls_hostname->u.s); |
1259 | } |
1260 | |
1261 | if (params->has_max_bandwidth) { |
1262 | dest->max_bandwidth = params->max_bandwidth; |
1263 | } |
1264 | |
1265 | if (params->has_downtime_limit) { |
1266 | dest->downtime_limit = params->downtime_limit; |
1267 | } |
1268 | |
1269 | if (params->has_x_checkpoint_delay) { |
1270 | dest->x_checkpoint_delay = params->x_checkpoint_delay; |
1271 | } |
1272 | |
1273 | if (params->has_block_incremental) { |
1274 | dest->block_incremental = params->block_incremental; |
1275 | } |
1276 | if (params->has_multifd_channels) { |
1277 | dest->multifd_channels = params->multifd_channels; |
1278 | } |
1279 | if (params->has_xbzrle_cache_size) { |
1280 | dest->xbzrle_cache_size = params->xbzrle_cache_size; |
1281 | } |
1282 | if (params->has_max_postcopy_bandwidth) { |
1283 | dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth; |
1284 | } |
1285 | if (params->has_max_cpu_throttle) { |
1286 | dest->max_cpu_throttle = params->max_cpu_throttle; |
1287 | } |
1288 | if (params->has_announce_initial) { |
1289 | dest->announce_initial = params->announce_initial; |
1290 | } |
1291 | if (params->has_announce_max) { |
1292 | dest->announce_max = params->announce_max; |
1293 | } |
1294 | if (params->has_announce_rounds) { |
1295 | dest->announce_rounds = params->announce_rounds; |
1296 | } |
1297 | if (params->has_announce_step) { |
1298 | dest->announce_step = params->announce_step; |
1299 | } |
1300 | } |
1301 | |
1302 | static void migrate_params_apply(MigrateSetParameters *params, Error **errp) |
1303 | { |
1304 | MigrationState *s = migrate_get_current(); |
1305 | |
1306 | /* TODO use QAPI_CLONE() instead of duplicating it inline */ |
1307 | |
1308 | if (params->has_compress_level) { |
1309 | s->parameters.compress_level = params->compress_level; |
1310 | } |
1311 | |
1312 | if (params->has_compress_threads) { |
1313 | s->parameters.compress_threads = params->compress_threads; |
1314 | } |
1315 | |
1316 | if (params->has_compress_wait_thread) { |
1317 | s->parameters.compress_wait_thread = params->compress_wait_thread; |
1318 | } |
1319 | |
1320 | if (params->has_decompress_threads) { |
1321 | s->parameters.decompress_threads = params->decompress_threads; |
1322 | } |
1323 | |
1324 | if (params->has_cpu_throttle_initial) { |
1325 | s->parameters.cpu_throttle_initial = params->cpu_throttle_initial; |
1326 | } |
1327 | |
1328 | if (params->has_cpu_throttle_increment) { |
1329 | s->parameters.cpu_throttle_increment = params->cpu_throttle_increment; |
1330 | } |
1331 | |
1332 | if (params->has_tls_creds) { |
1333 | g_free(s->parameters.tls_creds); |
1334 | assert(params->tls_creds->type == QTYPE_QSTRING); |
1335 | s->parameters.tls_creds = g_strdup(params->tls_creds->u.s); |
1336 | } |
1337 | |
1338 | if (params->has_tls_hostname) { |
1339 | g_free(s->parameters.tls_hostname); |
1340 | assert(params->tls_hostname->type == QTYPE_QSTRING); |
1341 | s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s); |
1342 | } |
1343 | |
1344 | if (params->has_tls_authz) { |
1345 | g_free(s->parameters.tls_authz); |
1346 | assert(params->tls_authz->type == QTYPE_QSTRING); |
1347 | s->parameters.tls_authz = g_strdup(params->tls_authz->u.s); |
1348 | } |
1349 | |
1350 | if (params->has_max_bandwidth) { |
1351 | s->parameters.max_bandwidth = params->max_bandwidth; |
1352 | if (s->to_dst_file && !migration_in_postcopy()) { |
1353 | qemu_file_set_rate_limit(s->to_dst_file, |
1354 | s->parameters.max_bandwidth / XFER_LIMIT_RATIO); |
1355 | } |
1356 | } |
1357 | |
1358 | if (params->has_downtime_limit) { |
1359 | s->parameters.downtime_limit = params->downtime_limit; |
1360 | } |
1361 | |
1362 | if (params->has_x_checkpoint_delay) { |
1363 | s->parameters.x_checkpoint_delay = params->x_checkpoint_delay; |
1364 | if (migration_in_colo_state()) { |
1365 | colo_checkpoint_notify(s); |
1366 | } |
1367 | } |
1368 | |
1369 | if (params->has_block_incremental) { |
1370 | s->parameters.block_incremental = params->block_incremental; |
1371 | } |
1372 | if (params->has_multifd_channels) { |
1373 | s->parameters.multifd_channels = params->multifd_channels; |
1374 | } |
1375 | if (params->has_xbzrle_cache_size) { |
1376 | s->parameters.xbzrle_cache_size = params->xbzrle_cache_size; |
1377 | xbzrle_cache_resize(params->xbzrle_cache_size, errp); |
1378 | } |
1379 | if (params->has_max_postcopy_bandwidth) { |
1380 | s->parameters.max_postcopy_bandwidth = params->max_postcopy_bandwidth; |
1381 | if (s->to_dst_file && migration_in_postcopy()) { |
1382 | qemu_file_set_rate_limit(s->to_dst_file, |
1383 | s->parameters.max_postcopy_bandwidth / XFER_LIMIT_RATIO); |
1384 | } |
1385 | } |
1386 | if (params->has_max_cpu_throttle) { |
1387 | s->parameters.max_cpu_throttle = params->max_cpu_throttle; |
1388 | } |
1389 | if (params->has_announce_initial) { |
1390 | s->parameters.announce_initial = params->announce_initial; |
1391 | } |
1392 | if (params->has_announce_max) { |
1393 | s->parameters.announce_max = params->announce_max; |
1394 | } |
1395 | if (params->has_announce_rounds) { |
1396 | s->parameters.announce_rounds = params->announce_rounds; |
1397 | } |
1398 | if (params->has_announce_step) { |
1399 | s->parameters.announce_step = params->announce_step; |
1400 | } |
1401 | } |
1402 | |
1403 | void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp) |
1404 | { |
1405 | MigrationParameters tmp; |
1406 | |
1407 | /* TODO Rewrite "" to null instead */ |
1408 | if (params->has_tls_creds |
1409 | && params->tls_creds->type == QTYPE_QNULL) { |
1410 | qobject_unref(params->tls_creds->u.n); |
1411 | params->tls_creds->type = QTYPE_QSTRING; |
1412 | params->tls_creds->u.s = strdup("" ); |
1413 | } |
1414 | /* TODO Rewrite "" to null instead */ |
1415 | if (params->has_tls_hostname |
1416 | && params->tls_hostname->type == QTYPE_QNULL) { |
1417 | qobject_unref(params->tls_hostname->u.n); |
1418 | params->tls_hostname->type = QTYPE_QSTRING; |
1419 | params->tls_hostname->u.s = strdup("" ); |
1420 | } |
1421 | |
1422 | migrate_params_test_apply(params, &tmp); |
1423 | |
1424 | if (!migrate_params_check(&tmp, errp)) { |
1425 | /* Invalid parameter */ |
1426 | return; |
1427 | } |
1428 | |
1429 | migrate_params_apply(params, errp); |
1430 | } |
1431 | |
1432 | |
1433 | void qmp_migrate_start_postcopy(Error **errp) |
1434 | { |
1435 | MigrationState *s = migrate_get_current(); |
1436 | |
1437 | if (!migrate_postcopy()) { |
1438 | error_setg(errp, "Enable postcopy with migrate_set_capability before" |
1439 | " the start of migration" ); |
1440 | return; |
1441 | } |
1442 | |
1443 | if (s->state == MIGRATION_STATUS_NONE) { |
1444 | error_setg(errp, "Postcopy must be started after migration has been" |
1445 | " started" ); |
1446 | return; |
1447 | } |
1448 | /* |
1449 | * we don't error if migration has finished since that would be racy |
1450 | * with issuing this command. |
1451 | */ |
1452 | atomic_set(&s->start_postcopy, true); |
1453 | } |
1454 | |
1455 | /* shared migration helpers */ |
1456 | |
1457 | void migrate_set_state(int *state, int old_state, int new_state) |
1458 | { |
1459 | assert(new_state < MIGRATION_STATUS__MAX); |
1460 | if (atomic_cmpxchg(state, old_state, new_state) == old_state) { |
1461 | trace_migrate_set_state(MigrationStatus_str(new_state)); |
1462 | migrate_generate_event(new_state); |
1463 | } |
1464 | } |
1465 | |
1466 | static MigrationCapabilityStatusList *migrate_cap_add( |
1467 | MigrationCapabilityStatusList *list, |
1468 | MigrationCapability index, |
1469 | bool state) |
1470 | { |
1471 | MigrationCapabilityStatusList *cap; |
1472 | |
1473 | cap = g_new0(MigrationCapabilityStatusList, 1); |
1474 | cap->value = g_new0(MigrationCapabilityStatus, 1); |
1475 | cap->value->capability = index; |
1476 | cap->value->state = state; |
1477 | cap->next = list; |
1478 | |
1479 | return cap; |
1480 | } |
1481 | |
1482 | void migrate_set_block_enabled(bool value, Error **errp) |
1483 | { |
1484 | MigrationCapabilityStatusList *cap; |
1485 | |
1486 | cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value); |
1487 | qmp_migrate_set_capabilities(cap, errp); |
1488 | qapi_free_MigrationCapabilityStatusList(cap); |
1489 | } |
1490 | |
1491 | static void migrate_set_block_incremental(MigrationState *s, bool value) |
1492 | { |
1493 | s->parameters.block_incremental = value; |
1494 | } |
1495 | |
1496 | static void block_cleanup_parameters(MigrationState *s) |
1497 | { |
1498 | if (s->must_remove_block_options) { |
1499 | /* setting to false can never fail */ |
1500 | migrate_set_block_enabled(false, &error_abort); |
1501 | migrate_set_block_incremental(s, false); |
1502 | s->must_remove_block_options = false; |
1503 | } |
1504 | } |
1505 | |
1506 | static void migrate_fd_cleanup(MigrationState *s) |
1507 | { |
1508 | qemu_bh_delete(s->cleanup_bh); |
1509 | s->cleanup_bh = NULL; |
1510 | |
1511 | qemu_savevm_state_cleanup(); |
1512 | |
1513 | if (s->to_dst_file) { |
1514 | QEMUFile *tmp; |
1515 | |
1516 | trace_migrate_fd_cleanup(); |
1517 | qemu_mutex_unlock_iothread(); |
1518 | if (s->migration_thread_running) { |
1519 | qemu_thread_join(&s->thread); |
1520 | s->migration_thread_running = false; |
1521 | } |
1522 | qemu_mutex_lock_iothread(); |
1523 | |
1524 | multifd_save_cleanup(); |
1525 | qemu_mutex_lock(&s->qemu_file_lock); |
1526 | tmp = s->to_dst_file; |
1527 | s->to_dst_file = NULL; |
1528 | qemu_mutex_unlock(&s->qemu_file_lock); |
1529 | /* |
1530 | * Close the file handle without the lock to make sure the |
1531 | * critical section won't block for long. |
1532 | */ |
1533 | qemu_fclose(tmp); |
1534 | } |
1535 | |
1536 | assert((s->state != MIGRATION_STATUS_ACTIVE) && |
1537 | (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE)); |
1538 | |
1539 | if (s->state == MIGRATION_STATUS_CANCELLING) { |
1540 | migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, |
1541 | MIGRATION_STATUS_CANCELLED); |
1542 | } |
1543 | |
1544 | if (s->error) { |
1545 | /* It is used on info migrate. We can't free it */ |
1546 | error_report_err(error_copy(s->error)); |
1547 | } |
1548 | notifier_list_notify(&migration_state_notifiers, s); |
1549 | block_cleanup_parameters(s); |
1550 | } |
1551 | |
1552 | static void migrate_fd_cleanup_schedule(MigrationState *s) |
1553 | { |
1554 | /* |
1555 | * Ref the state for bh, because it may be called when |
1556 | * there're already no other refs |
1557 | */ |
1558 | object_ref(OBJECT(s)); |
1559 | qemu_bh_schedule(s->cleanup_bh); |
1560 | } |
1561 | |
1562 | static void migrate_fd_cleanup_bh(void *opaque) |
1563 | { |
1564 | MigrationState *s = opaque; |
1565 | migrate_fd_cleanup(s); |
1566 | object_unref(OBJECT(s)); |
1567 | } |
1568 | |
1569 | void migrate_set_error(MigrationState *s, const Error *error) |
1570 | { |
1571 | qemu_mutex_lock(&s->error_mutex); |
1572 | if (!s->error) { |
1573 | s->error = error_copy(error); |
1574 | } |
1575 | qemu_mutex_unlock(&s->error_mutex); |
1576 | } |
1577 | |
1578 | void migrate_fd_error(MigrationState *s, const Error *error) |
1579 | { |
1580 | trace_migrate_fd_error(error_get_pretty(error)); |
1581 | assert(s->to_dst_file == NULL); |
1582 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1583 | MIGRATION_STATUS_FAILED); |
1584 | migrate_set_error(s, error); |
1585 | } |
1586 | |
1587 | static void migrate_fd_cancel(MigrationState *s) |
1588 | { |
1589 | int old_state ; |
1590 | QEMUFile *f = migrate_get_current()->to_dst_file; |
1591 | trace_migrate_fd_cancel(); |
1592 | |
1593 | if (s->rp_state.from_dst_file) { |
1594 | /* shutdown the rp socket, so causing the rp thread to shutdown */ |
1595 | qemu_file_shutdown(s->rp_state.from_dst_file); |
1596 | } |
1597 | |
1598 | do { |
1599 | old_state = s->state; |
1600 | if (!migration_is_setup_or_active(old_state)) { |
1601 | break; |
1602 | } |
1603 | /* If the migration is paused, kick it out of the pause */ |
1604 | if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) { |
1605 | qemu_sem_post(&s->pause_sem); |
1606 | } |
1607 | migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); |
1608 | } while (s->state != MIGRATION_STATUS_CANCELLING); |
1609 | |
1610 | /* |
1611 | * If we're unlucky the migration code might be stuck somewhere in a |
1612 | * send/write while the network has failed and is waiting to timeout; |
1613 | * if we've got shutdown(2) available then we can force it to quit. |
1614 | * The outgoing qemu file gets closed in migrate_fd_cleanup that is |
1615 | * called in a bh, so there is no race against this cancel. |
1616 | */ |
1617 | if (s->state == MIGRATION_STATUS_CANCELLING && f) { |
1618 | qemu_file_shutdown(f); |
1619 | } |
1620 | if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) { |
1621 | Error *local_err = NULL; |
1622 | |
1623 | bdrv_invalidate_cache_all(&local_err); |
1624 | if (local_err) { |
1625 | error_report_err(local_err); |
1626 | } else { |
1627 | s->block_inactive = false; |
1628 | } |
1629 | } |
1630 | } |
1631 | |
1632 | void add_migration_state_change_notifier(Notifier *notify) |
1633 | { |
1634 | notifier_list_add(&migration_state_notifiers, notify); |
1635 | } |
1636 | |
1637 | void remove_migration_state_change_notifier(Notifier *notify) |
1638 | { |
1639 | notifier_remove(notify); |
1640 | } |
1641 | |
1642 | bool migration_in_setup(MigrationState *s) |
1643 | { |
1644 | return s->state == MIGRATION_STATUS_SETUP; |
1645 | } |
1646 | |
1647 | bool migration_has_finished(MigrationState *s) |
1648 | { |
1649 | return s->state == MIGRATION_STATUS_COMPLETED; |
1650 | } |
1651 | |
1652 | bool migration_has_failed(MigrationState *s) |
1653 | { |
1654 | return (s->state == MIGRATION_STATUS_CANCELLED || |
1655 | s->state == MIGRATION_STATUS_FAILED); |
1656 | } |
1657 | |
1658 | bool migration_in_postcopy(void) |
1659 | { |
1660 | MigrationState *s = migrate_get_current(); |
1661 | |
1662 | return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); |
1663 | } |
1664 | |
1665 | bool migration_in_postcopy_after_devices(MigrationState *s) |
1666 | { |
1667 | return migration_in_postcopy() && s->postcopy_after_devices; |
1668 | } |
1669 | |
1670 | bool migration_is_idle(void) |
1671 | { |
1672 | MigrationState *s = current_migration; |
1673 | |
1674 | if (!s) { |
1675 | return true; |
1676 | } |
1677 | |
1678 | switch (s->state) { |
1679 | case MIGRATION_STATUS_NONE: |
1680 | case MIGRATION_STATUS_CANCELLED: |
1681 | case MIGRATION_STATUS_COMPLETED: |
1682 | case MIGRATION_STATUS_FAILED: |
1683 | return true; |
1684 | case MIGRATION_STATUS_SETUP: |
1685 | case MIGRATION_STATUS_CANCELLING: |
1686 | case MIGRATION_STATUS_ACTIVE: |
1687 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
1688 | case MIGRATION_STATUS_COLO: |
1689 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
1690 | case MIGRATION_STATUS_DEVICE: |
1691 | return false; |
1692 | case MIGRATION_STATUS__MAX: |
1693 | g_assert_not_reached(); |
1694 | } |
1695 | |
1696 | return false; |
1697 | } |
1698 | |
1699 | void migrate_init(MigrationState *s) |
1700 | { |
1701 | /* |
1702 | * Reinitialise all migration state, except |
1703 | * parameters/capabilities that the user set, and |
1704 | * locks. |
1705 | */ |
1706 | s->cleanup_bh = 0; |
1707 | s->to_dst_file = NULL; |
1708 | s->state = MIGRATION_STATUS_NONE; |
1709 | s->rp_state.from_dst_file = NULL; |
1710 | s->rp_state.error = false; |
1711 | s->mbps = 0.0; |
1712 | s->pages_per_second = 0.0; |
1713 | s->downtime = 0; |
1714 | s->expected_downtime = 0; |
1715 | s->setup_time = 0; |
1716 | s->start_postcopy = false; |
1717 | s->postcopy_after_devices = false; |
1718 | s->migration_thread_running = false; |
1719 | error_free(s->error); |
1720 | s->error = NULL; |
1721 | |
1722 | migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); |
1723 | |
1724 | s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
1725 | s->total_time = 0; |
1726 | s->vm_was_running = false; |
1727 | s->iteration_initial_bytes = 0; |
1728 | s->threshold_size = 0; |
1729 | } |
1730 | |
1731 | static GSList *migration_blockers; |
1732 | |
1733 | int migrate_add_blocker(Error *reason, Error **errp) |
1734 | { |
1735 | if (only_migratable) { |
1736 | error_propagate_prepend(errp, error_copy(reason), |
1737 | "disallowing migration blocker " |
1738 | "(--only-migratable) for: " ); |
1739 | return -EACCES; |
1740 | } |
1741 | |
1742 | if (migration_is_idle()) { |
1743 | migration_blockers = g_slist_prepend(migration_blockers, reason); |
1744 | return 0; |
1745 | } |
1746 | |
1747 | error_propagate_prepend(errp, error_copy(reason), |
1748 | "disallowing migration blocker " |
1749 | "(migration in progress) for: " ); |
1750 | return -EBUSY; |
1751 | } |
1752 | |
1753 | void migrate_del_blocker(Error *reason) |
1754 | { |
1755 | migration_blockers = g_slist_remove(migration_blockers, reason); |
1756 | } |
1757 | |
1758 | void qmp_migrate_incoming(const char *uri, Error **errp) |
1759 | { |
1760 | Error *local_err = NULL; |
1761 | static bool once = true; |
1762 | |
1763 | if (!deferred_incoming) { |
1764 | error_setg(errp, "For use with '-incoming defer'" ); |
1765 | return; |
1766 | } |
1767 | if (!once) { |
1768 | error_setg(errp, "The incoming migration has already been started" ); |
1769 | } |
1770 | |
1771 | qemu_start_incoming_migration(uri, &local_err); |
1772 | |
1773 | if (local_err) { |
1774 | error_propagate(errp, local_err); |
1775 | return; |
1776 | } |
1777 | |
1778 | once = false; |
1779 | } |
1780 | |
1781 | void qmp_migrate_recover(const char *uri, Error **errp) |
1782 | { |
1783 | MigrationIncomingState *mis = migration_incoming_get_current(); |
1784 | |
1785 | if (mis->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { |
1786 | error_setg(errp, "Migrate recover can only be run " |
1787 | "when postcopy is paused." ); |
1788 | return; |
1789 | } |
1790 | |
1791 | if (atomic_cmpxchg(&mis->postcopy_recover_triggered, |
1792 | false, true) == true) { |
1793 | error_setg(errp, "Migrate recovery is triggered already" ); |
1794 | return; |
1795 | } |
1796 | |
1797 | /* |
1798 | * Note that this call will never start a real migration; it will |
1799 | * only re-setup the migration stream and poke existing migration |
1800 | * to continue using that newly established channel. |
1801 | */ |
1802 | qemu_start_incoming_migration(uri, errp); |
1803 | } |
1804 | |
1805 | void qmp_migrate_pause(Error **errp) |
1806 | { |
1807 | MigrationState *ms = migrate_get_current(); |
1808 | MigrationIncomingState *mis = migration_incoming_get_current(); |
1809 | int ret; |
1810 | |
1811 | if (ms->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { |
1812 | /* Source side, during postcopy */ |
1813 | qemu_mutex_lock(&ms->qemu_file_lock); |
1814 | ret = qemu_file_shutdown(ms->to_dst_file); |
1815 | qemu_mutex_unlock(&ms->qemu_file_lock); |
1816 | if (ret) { |
1817 | error_setg(errp, "Failed to pause source migration" ); |
1818 | } |
1819 | return; |
1820 | } |
1821 | |
1822 | if (mis->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { |
1823 | ret = qemu_file_shutdown(mis->from_src_file); |
1824 | if (ret) { |
1825 | error_setg(errp, "Failed to pause destination migration" ); |
1826 | } |
1827 | return; |
1828 | } |
1829 | |
1830 | error_setg(errp, "migrate-pause is currently only supported " |
1831 | "during postcopy-active state" ); |
1832 | } |
1833 | |
1834 | bool migration_is_blocked(Error **errp) |
1835 | { |
1836 | if (qemu_savevm_state_blocked(errp)) { |
1837 | return true; |
1838 | } |
1839 | |
1840 | if (migration_blockers) { |
1841 | error_propagate(errp, error_copy(migration_blockers->data)); |
1842 | return true; |
1843 | } |
1844 | |
1845 | return false; |
1846 | } |
1847 | |
1848 | /* Returns true if continue to migrate, or false if error detected */ |
1849 | static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc, |
1850 | bool resume, Error **errp) |
1851 | { |
1852 | Error *local_err = NULL; |
1853 | |
1854 | if (resume) { |
1855 | if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { |
1856 | error_setg(errp, "Cannot resume if there is no " |
1857 | "paused migration" ); |
1858 | return false; |
1859 | } |
1860 | |
1861 | /* |
1862 | * Postcopy recovery won't work well with release-ram |
1863 | * capability since release-ram will drop the page buffer as |
1864 | * long as the page is put into the send buffer. So if there |
1865 | * is a network failure happened, any page buffers that have |
1866 | * not yet reached the destination VM but have already been |
1867 | * sent from the source VM will be lost forever. Let's refuse |
1868 | * the client from resuming such a postcopy migration. |
1869 | * Luckily release-ram was designed to only be used when src |
1870 | * and destination VMs are on the same host, so it should be |
1871 | * fine. |
1872 | */ |
1873 | if (migrate_release_ram()) { |
1874 | error_setg(errp, "Postcopy recovery cannot work " |
1875 | "when release-ram capability is set" ); |
1876 | return false; |
1877 | } |
1878 | |
1879 | /* This is a resume, skip init status */ |
1880 | return true; |
1881 | } |
1882 | |
1883 | if (migration_is_setup_or_active(s->state) || |
1884 | s->state == MIGRATION_STATUS_CANCELLING || |
1885 | s->state == MIGRATION_STATUS_COLO) { |
1886 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
1887 | return false; |
1888 | } |
1889 | |
1890 | if (runstate_check(RUN_STATE_INMIGRATE)) { |
1891 | error_setg(errp, "Guest is waiting for an incoming migration" ); |
1892 | return false; |
1893 | } |
1894 | |
1895 | if (migration_is_blocked(errp)) { |
1896 | return false; |
1897 | } |
1898 | |
1899 | if (blk || blk_inc) { |
1900 | if (migrate_use_block() || migrate_use_block_incremental()) { |
1901 | error_setg(errp, "Command options are incompatible with " |
1902 | "current migration capabilities" ); |
1903 | return false; |
1904 | } |
1905 | migrate_set_block_enabled(true, &local_err); |
1906 | if (local_err) { |
1907 | error_propagate(errp, local_err); |
1908 | return false; |
1909 | } |
1910 | s->must_remove_block_options = true; |
1911 | } |
1912 | |
1913 | if (blk_inc) { |
1914 | migrate_set_block_incremental(s, true); |
1915 | } |
1916 | |
1917 | migrate_init(s); |
1918 | /* |
1919 | * set ram_counters memory to zero for a |
1920 | * new migration |
1921 | */ |
1922 | memset(&ram_counters, 0, sizeof(ram_counters)); |
1923 | |
1924 | return true; |
1925 | } |
1926 | |
1927 | void qmp_migrate(const char *uri, bool has_blk, bool blk, |
1928 | bool has_inc, bool inc, bool has_detach, bool detach, |
1929 | bool has_resume, bool resume, Error **errp) |
1930 | { |
1931 | Error *local_err = NULL; |
1932 | MigrationState *s = migrate_get_current(); |
1933 | const char *p; |
1934 | |
1935 | if (!migrate_prepare(s, has_blk && blk, has_inc && inc, |
1936 | has_resume && resume, errp)) { |
1937 | /* Error detected, put into errp */ |
1938 | return; |
1939 | } |
1940 | |
1941 | if (strstart(uri, "tcp:" , &p)) { |
1942 | tcp_start_outgoing_migration(s, p, &local_err); |
1943 | #ifdef CONFIG_RDMA |
1944 | } else if (strstart(uri, "rdma:" , &p)) { |
1945 | rdma_start_outgoing_migration(s, p, &local_err); |
1946 | #endif |
1947 | } else if (strstart(uri, "exec:" , &p)) { |
1948 | exec_start_outgoing_migration(s, p, &local_err); |
1949 | } else if (strstart(uri, "unix:" , &p)) { |
1950 | unix_start_outgoing_migration(s, p, &local_err); |
1951 | } else if (strstart(uri, "fd:" , &p)) { |
1952 | fd_start_outgoing_migration(s, p, &local_err); |
1953 | } else { |
1954 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri" , |
1955 | "a valid migration protocol" ); |
1956 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1957 | MIGRATION_STATUS_FAILED); |
1958 | block_cleanup_parameters(s); |
1959 | return; |
1960 | } |
1961 | |
1962 | if (local_err) { |
1963 | migrate_fd_error(s, local_err); |
1964 | error_propagate(errp, local_err); |
1965 | return; |
1966 | } |
1967 | } |
1968 | |
1969 | void qmp_migrate_cancel(Error **errp) |
1970 | { |
1971 | migrate_fd_cancel(migrate_get_current()); |
1972 | } |
1973 | |
1974 | void qmp_migrate_continue(MigrationStatus state, Error **errp) |
1975 | { |
1976 | MigrationState *s = migrate_get_current(); |
1977 | if (s->state != state) { |
1978 | error_setg(errp, "Migration not in expected state: %s" , |
1979 | MigrationStatus_str(s->state)); |
1980 | return; |
1981 | } |
1982 | qemu_sem_post(&s->pause_sem); |
1983 | } |
1984 | |
1985 | void qmp_migrate_set_cache_size(int64_t value, Error **errp) |
1986 | { |
1987 | MigrateSetParameters p = { |
1988 | .has_xbzrle_cache_size = true, |
1989 | .xbzrle_cache_size = value, |
1990 | }; |
1991 | |
1992 | qmp_migrate_set_parameters(&p, errp); |
1993 | } |
1994 | |
1995 | int64_t qmp_query_migrate_cache_size(Error **errp) |
1996 | { |
1997 | return migrate_xbzrle_cache_size(); |
1998 | } |
1999 | |
2000 | void qmp_migrate_set_speed(int64_t value, Error **errp) |
2001 | { |
2002 | MigrateSetParameters p = { |
2003 | .has_max_bandwidth = true, |
2004 | .max_bandwidth = value, |
2005 | }; |
2006 | |
2007 | qmp_migrate_set_parameters(&p, errp); |
2008 | } |
2009 | |
2010 | void qmp_migrate_set_downtime(double value, Error **errp) |
2011 | { |
2012 | if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) { |
2013 | error_setg(errp, "Parameter 'downtime_limit' expects an integer in " |
2014 | "the range of 0 to %d seconds" , |
2015 | MAX_MIGRATE_DOWNTIME_SECONDS); |
2016 | return; |
2017 | } |
2018 | |
2019 | value *= 1000; /* Convert to milliseconds */ |
2020 | value = MAX(0, MIN(INT64_MAX, value)); |
2021 | |
2022 | MigrateSetParameters p = { |
2023 | .has_downtime_limit = true, |
2024 | .downtime_limit = value, |
2025 | }; |
2026 | |
2027 | qmp_migrate_set_parameters(&p, errp); |
2028 | } |
2029 | |
2030 | bool migrate_release_ram(void) |
2031 | { |
2032 | MigrationState *s; |
2033 | |
2034 | s = migrate_get_current(); |
2035 | |
2036 | return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM]; |
2037 | } |
2038 | |
2039 | bool migrate_postcopy_ram(void) |
2040 | { |
2041 | MigrationState *s; |
2042 | |
2043 | s = migrate_get_current(); |
2044 | |
2045 | return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM]; |
2046 | } |
2047 | |
2048 | bool migrate_postcopy(void) |
2049 | { |
2050 | return migrate_postcopy_ram() || migrate_dirty_bitmaps(); |
2051 | } |
2052 | |
2053 | bool migrate_auto_converge(void) |
2054 | { |
2055 | MigrationState *s; |
2056 | |
2057 | s = migrate_get_current(); |
2058 | |
2059 | return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE]; |
2060 | } |
2061 | |
2062 | bool migrate_zero_blocks(void) |
2063 | { |
2064 | MigrationState *s; |
2065 | |
2066 | s = migrate_get_current(); |
2067 | |
2068 | return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS]; |
2069 | } |
2070 | |
2071 | bool migrate_postcopy_blocktime(void) |
2072 | { |
2073 | MigrationState *s; |
2074 | |
2075 | s = migrate_get_current(); |
2076 | |
2077 | return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME]; |
2078 | } |
2079 | |
2080 | bool migrate_use_compression(void) |
2081 | { |
2082 | MigrationState *s; |
2083 | |
2084 | s = migrate_get_current(); |
2085 | |
2086 | return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS]; |
2087 | } |
2088 | |
2089 | int migrate_compress_level(void) |
2090 | { |
2091 | MigrationState *s; |
2092 | |
2093 | s = migrate_get_current(); |
2094 | |
2095 | return s->parameters.compress_level; |
2096 | } |
2097 | |
2098 | int migrate_compress_threads(void) |
2099 | { |
2100 | MigrationState *s; |
2101 | |
2102 | s = migrate_get_current(); |
2103 | |
2104 | return s->parameters.compress_threads; |
2105 | } |
2106 | |
2107 | int migrate_compress_wait_thread(void) |
2108 | { |
2109 | MigrationState *s; |
2110 | |
2111 | s = migrate_get_current(); |
2112 | |
2113 | return s->parameters.compress_wait_thread; |
2114 | } |
2115 | |
2116 | int migrate_decompress_threads(void) |
2117 | { |
2118 | MigrationState *s; |
2119 | |
2120 | s = migrate_get_current(); |
2121 | |
2122 | return s->parameters.decompress_threads; |
2123 | } |
2124 | |
2125 | bool migrate_dirty_bitmaps(void) |
2126 | { |
2127 | MigrationState *s; |
2128 | |
2129 | s = migrate_get_current(); |
2130 | |
2131 | return s->enabled_capabilities[MIGRATION_CAPABILITY_DIRTY_BITMAPS]; |
2132 | } |
2133 | |
2134 | bool migrate_ignore_shared(void) |
2135 | { |
2136 | MigrationState *s; |
2137 | |
2138 | s = migrate_get_current(); |
2139 | |
2140 | return s->enabled_capabilities[MIGRATION_CAPABILITY_X_IGNORE_SHARED]; |
2141 | } |
2142 | |
2143 | bool migrate_use_events(void) |
2144 | { |
2145 | MigrationState *s; |
2146 | |
2147 | s = migrate_get_current(); |
2148 | |
2149 | return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS]; |
2150 | } |
2151 | |
2152 | bool migrate_use_multifd(void) |
2153 | { |
2154 | MigrationState *s; |
2155 | |
2156 | s = migrate_get_current(); |
2157 | |
2158 | return s->enabled_capabilities[MIGRATION_CAPABILITY_MULTIFD]; |
2159 | } |
2160 | |
2161 | bool migrate_pause_before_switchover(void) |
2162 | { |
2163 | MigrationState *s; |
2164 | |
2165 | s = migrate_get_current(); |
2166 | |
2167 | return s->enabled_capabilities[ |
2168 | MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER]; |
2169 | } |
2170 | |
2171 | int migrate_multifd_channels(void) |
2172 | { |
2173 | MigrationState *s; |
2174 | |
2175 | s = migrate_get_current(); |
2176 | |
2177 | return s->parameters.multifd_channels; |
2178 | } |
2179 | |
2180 | int migrate_use_xbzrle(void) |
2181 | { |
2182 | MigrationState *s; |
2183 | |
2184 | s = migrate_get_current(); |
2185 | |
2186 | return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE]; |
2187 | } |
2188 | |
2189 | int64_t migrate_xbzrle_cache_size(void) |
2190 | { |
2191 | MigrationState *s; |
2192 | |
2193 | s = migrate_get_current(); |
2194 | |
2195 | return s->parameters.xbzrle_cache_size; |
2196 | } |
2197 | |
2198 | static int64_t migrate_max_postcopy_bandwidth(void) |
2199 | { |
2200 | MigrationState *s; |
2201 | |
2202 | s = migrate_get_current(); |
2203 | |
2204 | return s->parameters.max_postcopy_bandwidth; |
2205 | } |
2206 | |
2207 | bool migrate_use_block(void) |
2208 | { |
2209 | MigrationState *s; |
2210 | |
2211 | s = migrate_get_current(); |
2212 | |
2213 | return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK]; |
2214 | } |
2215 | |
2216 | bool migrate_use_return_path(void) |
2217 | { |
2218 | MigrationState *s; |
2219 | |
2220 | s = migrate_get_current(); |
2221 | |
2222 | return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH]; |
2223 | } |
2224 | |
2225 | bool migrate_use_block_incremental(void) |
2226 | { |
2227 | MigrationState *s; |
2228 | |
2229 | s = migrate_get_current(); |
2230 | |
2231 | return s->parameters.block_incremental; |
2232 | } |
2233 | |
2234 | /* migration thread support */ |
2235 | /* |
2236 | * Something bad happened to the RP stream, mark an error |
2237 | * The caller shall print or trace something to indicate why |
2238 | */ |
2239 | static void mark_source_rp_bad(MigrationState *s) |
2240 | { |
2241 | s->rp_state.error = true; |
2242 | } |
2243 | |
2244 | static struct rp_cmd_args { |
2245 | ssize_t len; /* -1 = variable */ |
2246 | const char *name; |
2247 | } rp_cmd_args[] = { |
2248 | [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, |
2249 | [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, |
2250 | [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, |
2251 | [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, |
2252 | [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, |
2253 | [MIG_RP_MSG_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" }, |
2254 | [MIG_RP_MSG_RESUME_ACK] = { .len = 4, .name = "RESUME_ACK" }, |
2255 | [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, |
2256 | }; |
2257 | |
2258 | /* |
2259 | * Process a request for pages received on the return path, |
2260 | * We're allowed to send more than requested (e.g. to round to our page size) |
2261 | * and we don't need to send pages that have already been sent. |
2262 | */ |
2263 | static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, |
2264 | ram_addr_t start, size_t len) |
2265 | { |
2266 | long our_host_ps = getpagesize(); |
2267 | |
2268 | trace_migrate_handle_rp_req_pages(rbname, start, len); |
2269 | |
2270 | /* |
2271 | * Since we currently insist on matching page sizes, just sanity check |
2272 | * we're being asked for whole host pages. |
2273 | */ |
2274 | if (start & (our_host_ps-1) || |
2275 | (len & (our_host_ps-1))) { |
2276 | error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT |
2277 | " len: %zd" , __func__, start, len); |
2278 | mark_source_rp_bad(ms); |
2279 | return; |
2280 | } |
2281 | |
2282 | if (ram_save_queue_pages(rbname, start, len)) { |
2283 | mark_source_rp_bad(ms); |
2284 | } |
2285 | } |
2286 | |
2287 | /* Return true to retry, false to quit */ |
2288 | static bool postcopy_pause_return_path_thread(MigrationState *s) |
2289 | { |
2290 | trace_postcopy_pause_return_path(); |
2291 | |
2292 | qemu_sem_wait(&s->postcopy_pause_rp_sem); |
2293 | |
2294 | trace_postcopy_pause_return_path_continued(); |
2295 | |
2296 | return true; |
2297 | } |
2298 | |
2299 | static int migrate_handle_rp_recv_bitmap(MigrationState *s, char *block_name) |
2300 | { |
2301 | RAMBlock *block = qemu_ram_block_by_name(block_name); |
2302 | |
2303 | if (!block) { |
2304 | error_report("%s: invalid block name '%s'" , __func__, block_name); |
2305 | return -EINVAL; |
2306 | } |
2307 | |
2308 | /* Fetch the received bitmap and refresh the dirty bitmap */ |
2309 | return ram_dirty_bitmap_reload(s, block); |
2310 | } |
2311 | |
2312 | static int migrate_handle_rp_resume_ack(MigrationState *s, uint32_t value) |
2313 | { |
2314 | trace_source_return_path_thread_resume_ack(value); |
2315 | |
2316 | if (value != MIGRATION_RESUME_ACK_VALUE) { |
2317 | error_report("%s: illegal resume_ack value %" PRIu32, |
2318 | __func__, value); |
2319 | return -1; |
2320 | } |
2321 | |
2322 | /* Now both sides are active. */ |
2323 | migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_RECOVER, |
2324 | MIGRATION_STATUS_POSTCOPY_ACTIVE); |
2325 | |
2326 | /* Notify send thread that time to continue send pages */ |
2327 | qemu_sem_post(&s->rp_state.rp_sem); |
2328 | |
2329 | return 0; |
2330 | } |
2331 | |
2332 | /* |
2333 | * Handles messages sent on the return path towards the source VM |
2334 | * |
2335 | */ |
2336 | static void *source_return_path_thread(void *opaque) |
2337 | { |
2338 | MigrationState *ms = opaque; |
2339 | QEMUFile *rp = ms->rp_state.from_dst_file; |
2340 | uint16_t , ; |
2341 | uint8_t buf[512]; |
2342 | uint32_t tmp32, sibling_error; |
2343 | ram_addr_t start = 0; /* =0 to silence warning */ |
2344 | size_t len = 0, expected_len; |
2345 | int res; |
2346 | |
2347 | trace_source_return_path_thread_entry(); |
2348 | rcu_register_thread(); |
2349 | |
2350 | retry: |
2351 | while (!ms->rp_state.error && !qemu_file_get_error(rp) && |
2352 | migration_is_setup_or_active(ms->state)) { |
2353 | trace_source_return_path_thread_loop_top(); |
2354 | header_type = qemu_get_be16(rp); |
2355 | header_len = qemu_get_be16(rp); |
2356 | |
2357 | if (qemu_file_get_error(rp)) { |
2358 | mark_source_rp_bad(ms); |
2359 | goto out; |
2360 | } |
2361 | |
2362 | if (header_type >= MIG_RP_MSG_MAX || |
2363 | header_type == MIG_RP_MSG_INVALID) { |
2364 | error_report("RP: Received invalid message 0x%04x length 0x%04x" , |
2365 | header_type, header_len); |
2366 | mark_source_rp_bad(ms); |
2367 | goto out; |
2368 | } |
2369 | |
2370 | if ((rp_cmd_args[header_type].len != -1 && |
2371 | header_len != rp_cmd_args[header_type].len) || |
2372 | header_len > sizeof(buf)) { |
2373 | error_report("RP: Received '%s' message (0x%04x) with" |
2374 | "incorrect length %d expecting %zu" , |
2375 | rp_cmd_args[header_type].name, header_type, header_len, |
2376 | (size_t)rp_cmd_args[header_type].len); |
2377 | mark_source_rp_bad(ms); |
2378 | goto out; |
2379 | } |
2380 | |
2381 | /* We know we've got a valid header by this point */ |
2382 | res = qemu_get_buffer(rp, buf, header_len); |
2383 | if (res != header_len) { |
2384 | error_report("RP: Failed reading data for message 0x%04x" |
2385 | " read %d expected %d" , |
2386 | header_type, res, header_len); |
2387 | mark_source_rp_bad(ms); |
2388 | goto out; |
2389 | } |
2390 | |
2391 | /* OK, we have the message and the data */ |
2392 | switch (header_type) { |
2393 | case MIG_RP_MSG_SHUT: |
2394 | sibling_error = ldl_be_p(buf); |
2395 | trace_source_return_path_thread_shut(sibling_error); |
2396 | if (sibling_error) { |
2397 | error_report("RP: Sibling indicated error %d" , sibling_error); |
2398 | mark_source_rp_bad(ms); |
2399 | } |
2400 | /* |
2401 | * We'll let the main thread deal with closing the RP |
2402 | * we could do a shutdown(2) on it, but we're the only user |
2403 | * anyway, so there's nothing gained. |
2404 | */ |
2405 | goto out; |
2406 | |
2407 | case MIG_RP_MSG_PONG: |
2408 | tmp32 = ldl_be_p(buf); |
2409 | trace_source_return_path_thread_pong(tmp32); |
2410 | break; |
2411 | |
2412 | case MIG_RP_MSG_REQ_PAGES: |
2413 | start = ldq_be_p(buf); |
2414 | len = ldl_be_p(buf + 8); |
2415 | migrate_handle_rp_req_pages(ms, NULL, start, len); |
2416 | break; |
2417 | |
2418 | case MIG_RP_MSG_REQ_PAGES_ID: |
2419 | expected_len = 12 + 1; /* header + termination */ |
2420 | |
2421 | if (header_len >= expected_len) { |
2422 | start = ldq_be_p(buf); |
2423 | len = ldl_be_p(buf + 8); |
2424 | /* Now we expect an idstr */ |
2425 | tmp32 = buf[12]; /* Length of the following idstr */ |
2426 | buf[13 + tmp32] = '\0'; |
2427 | expected_len += tmp32; |
2428 | } |
2429 | if (header_len != expected_len) { |
2430 | error_report("RP: Req_Page_id with length %d expecting %zd" , |
2431 | header_len, expected_len); |
2432 | mark_source_rp_bad(ms); |
2433 | goto out; |
2434 | } |
2435 | migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); |
2436 | break; |
2437 | |
2438 | case MIG_RP_MSG_RECV_BITMAP: |
2439 | if (header_len < 1) { |
2440 | error_report("%s: missing block name" , __func__); |
2441 | mark_source_rp_bad(ms); |
2442 | goto out; |
2443 | } |
2444 | /* Format: len (1B) + idstr (<255B). This ends the idstr. */ |
2445 | buf[buf[0] + 1] = '\0'; |
2446 | if (migrate_handle_rp_recv_bitmap(ms, (char *)(buf + 1))) { |
2447 | mark_source_rp_bad(ms); |
2448 | goto out; |
2449 | } |
2450 | break; |
2451 | |
2452 | case MIG_RP_MSG_RESUME_ACK: |
2453 | tmp32 = ldl_be_p(buf); |
2454 | if (migrate_handle_rp_resume_ack(ms, tmp32)) { |
2455 | mark_source_rp_bad(ms); |
2456 | goto out; |
2457 | } |
2458 | break; |
2459 | |
2460 | default: |
2461 | break; |
2462 | } |
2463 | } |
2464 | |
2465 | out: |
2466 | res = qemu_file_get_error(rp); |
2467 | if (res) { |
2468 | if (res == -EIO) { |
2469 | /* |
2470 | * Maybe there is something we can do: it looks like a |
2471 | * network down issue, and we pause for a recovery. |
2472 | */ |
2473 | if (postcopy_pause_return_path_thread(ms)) { |
2474 | /* Reload rp, reset the rest */ |
2475 | if (rp != ms->rp_state.from_dst_file) { |
2476 | qemu_fclose(rp); |
2477 | rp = ms->rp_state.from_dst_file; |
2478 | } |
2479 | ms->rp_state.error = false; |
2480 | goto retry; |
2481 | } |
2482 | } |
2483 | |
2484 | trace_source_return_path_thread_bad_end(); |
2485 | mark_source_rp_bad(ms); |
2486 | } |
2487 | |
2488 | trace_source_return_path_thread_end(); |
2489 | ms->rp_state.from_dst_file = NULL; |
2490 | qemu_fclose(rp); |
2491 | rcu_unregister_thread(); |
2492 | return NULL; |
2493 | } |
2494 | |
2495 | static int open_return_path_on_source(MigrationState *ms, |
2496 | bool create_thread) |
2497 | { |
2498 | |
2499 | ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); |
2500 | if (!ms->rp_state.from_dst_file) { |
2501 | return -1; |
2502 | } |
2503 | |
2504 | trace_open_return_path_on_source(); |
2505 | |
2506 | if (!create_thread) { |
2507 | /* We're done */ |
2508 | return 0; |
2509 | } |
2510 | |
2511 | qemu_thread_create(&ms->rp_state.rp_thread, "return path" , |
2512 | source_return_path_thread, ms, QEMU_THREAD_JOINABLE); |
2513 | |
2514 | trace_open_return_path_on_source_continue(); |
2515 | |
2516 | return 0; |
2517 | } |
2518 | |
2519 | /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ |
2520 | static int await_return_path_close_on_source(MigrationState *ms) |
2521 | { |
2522 | /* |
2523 | * If this is a normal exit then the destination will send a SHUT and the |
2524 | * rp_thread will exit, however if there's an error we need to cause |
2525 | * it to exit. |
2526 | */ |
2527 | if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) { |
2528 | /* |
2529 | * shutdown(2), if we have it, will cause it to unblock if it's stuck |
2530 | * waiting for the destination. |
2531 | */ |
2532 | qemu_file_shutdown(ms->rp_state.from_dst_file); |
2533 | mark_source_rp_bad(ms); |
2534 | } |
2535 | trace_await_return_path_close_on_source_joining(); |
2536 | qemu_thread_join(&ms->rp_state.rp_thread); |
2537 | trace_await_return_path_close_on_source_close(); |
2538 | return ms->rp_state.error; |
2539 | } |
2540 | |
2541 | /* |
2542 | * Switch from normal iteration to postcopy |
2543 | * Returns non-0 on error |
2544 | */ |
2545 | static int postcopy_start(MigrationState *ms) |
2546 | { |
2547 | int ret; |
2548 | QIOChannelBuffer *bioc; |
2549 | QEMUFile *fb; |
2550 | int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
2551 | int64_t bandwidth = migrate_max_postcopy_bandwidth(); |
2552 | bool restart_block = false; |
2553 | int cur_state = MIGRATION_STATUS_ACTIVE; |
2554 | if (!migrate_pause_before_switchover()) { |
2555 | migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, |
2556 | MIGRATION_STATUS_POSTCOPY_ACTIVE); |
2557 | } |
2558 | |
2559 | trace_postcopy_start(); |
2560 | qemu_mutex_lock_iothread(); |
2561 | trace_postcopy_start_set_run(); |
2562 | |
2563 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); |
2564 | global_state_store(); |
2565 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); |
2566 | if (ret < 0) { |
2567 | goto fail; |
2568 | } |
2569 | |
2570 | ret = migration_maybe_pause(ms, &cur_state, |
2571 | MIGRATION_STATUS_POSTCOPY_ACTIVE); |
2572 | if (ret < 0) { |
2573 | goto fail; |
2574 | } |
2575 | |
2576 | ret = bdrv_inactivate_all(); |
2577 | if (ret < 0) { |
2578 | goto fail; |
2579 | } |
2580 | restart_block = true; |
2581 | |
2582 | /* |
2583 | * Cause any non-postcopiable, but iterative devices to |
2584 | * send out their final data. |
2585 | */ |
2586 | qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false); |
2587 | |
2588 | /* |
2589 | * in Finish migrate and with the io-lock held everything should |
2590 | * be quiet, but we've potentially still got dirty pages and we |
2591 | * need to tell the destination to throw any pages it's already received |
2592 | * that are dirty |
2593 | */ |
2594 | if (migrate_postcopy_ram()) { |
2595 | if (ram_postcopy_send_discard_bitmap(ms)) { |
2596 | error_report("postcopy send discard bitmap failed" ); |
2597 | goto fail; |
2598 | } |
2599 | } |
2600 | |
2601 | /* |
2602 | * send rest of state - note things that are doing postcopy |
2603 | * will notice we're in POSTCOPY_ACTIVE and not actually |
2604 | * wrap their state up here |
2605 | */ |
2606 | /* 0 max-postcopy-bandwidth means unlimited */ |
2607 | if (!bandwidth) { |
2608 | qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX); |
2609 | } else { |
2610 | qemu_file_set_rate_limit(ms->to_dst_file, bandwidth / XFER_LIMIT_RATIO); |
2611 | } |
2612 | if (migrate_postcopy_ram()) { |
2613 | /* Ping just for debugging, helps line traces up */ |
2614 | qemu_savevm_send_ping(ms->to_dst_file, 2); |
2615 | } |
2616 | |
2617 | /* |
2618 | * While loading the device state we may trigger page transfer |
2619 | * requests and the fd must be free to process those, and thus |
2620 | * the destination must read the whole device state off the fd before |
2621 | * it starts processing it. Unfortunately the ad-hoc migration format |
2622 | * doesn't allow the destination to know the size to read without fully |
2623 | * parsing it through each devices load-state code (especially the open |
2624 | * coded devices that use get/put). |
2625 | * So we wrap the device state up in a package with a length at the start; |
2626 | * to do this we use a qemu_buf to hold the whole of the device state. |
2627 | */ |
2628 | bioc = qio_channel_buffer_new(4096); |
2629 | qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer" ); |
2630 | fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc)); |
2631 | object_unref(OBJECT(bioc)); |
2632 | |
2633 | /* |
2634 | * Make sure the receiver can get incoming pages before we send the rest |
2635 | * of the state |
2636 | */ |
2637 | qemu_savevm_send_postcopy_listen(fb); |
2638 | |
2639 | qemu_savevm_state_complete_precopy(fb, false, false); |
2640 | if (migrate_postcopy_ram()) { |
2641 | qemu_savevm_send_ping(fb, 3); |
2642 | } |
2643 | |
2644 | qemu_savevm_send_postcopy_run(fb); |
2645 | |
2646 | /* <><> end of stuff going into the package */ |
2647 | |
2648 | /* Last point of recovery; as soon as we send the package the destination |
2649 | * can open devices and potentially start running. |
2650 | * Lets just check again we've not got any errors. |
2651 | */ |
2652 | ret = qemu_file_get_error(ms->to_dst_file); |
2653 | if (ret) { |
2654 | error_report("postcopy_start: Migration stream errored (pre package)" ); |
2655 | goto fail_closefb; |
2656 | } |
2657 | |
2658 | restart_block = false; |
2659 | |
2660 | /* Now send that blob */ |
2661 | if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) { |
2662 | goto fail_closefb; |
2663 | } |
2664 | qemu_fclose(fb); |
2665 | |
2666 | /* Send a notify to give a chance for anything that needs to happen |
2667 | * at the transition to postcopy and after the device state; in particular |
2668 | * spice needs to trigger a transition now |
2669 | */ |
2670 | ms->postcopy_after_devices = true; |
2671 | notifier_list_notify(&migration_state_notifiers, ms); |
2672 | |
2673 | ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop; |
2674 | |
2675 | qemu_mutex_unlock_iothread(); |
2676 | |
2677 | if (migrate_postcopy_ram()) { |
2678 | /* |
2679 | * Although this ping is just for debug, it could potentially be |
2680 | * used for getting a better measurement of downtime at the source. |
2681 | */ |
2682 | qemu_savevm_send_ping(ms->to_dst_file, 4); |
2683 | } |
2684 | |
2685 | if (migrate_release_ram()) { |
2686 | ram_postcopy_migrated_memory_release(ms); |
2687 | } |
2688 | |
2689 | ret = qemu_file_get_error(ms->to_dst_file); |
2690 | if (ret) { |
2691 | error_report("postcopy_start: Migration stream errored" ); |
2692 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
2693 | MIGRATION_STATUS_FAILED); |
2694 | } |
2695 | |
2696 | return ret; |
2697 | |
2698 | fail_closefb: |
2699 | qemu_fclose(fb); |
2700 | fail: |
2701 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
2702 | MIGRATION_STATUS_FAILED); |
2703 | if (restart_block) { |
2704 | /* A failure happened early enough that we know the destination hasn't |
2705 | * accessed block devices, so we're safe to recover. |
2706 | */ |
2707 | Error *local_err = NULL; |
2708 | |
2709 | bdrv_invalidate_cache_all(&local_err); |
2710 | if (local_err) { |
2711 | error_report_err(local_err); |
2712 | } |
2713 | } |
2714 | qemu_mutex_unlock_iothread(); |
2715 | return -1; |
2716 | } |
2717 | |
2718 | /** |
2719 | * migration_maybe_pause: Pause if required to by |
2720 | * migrate_pause_before_switchover called with the iothread locked |
2721 | * Returns: 0 on success |
2722 | */ |
2723 | static int migration_maybe_pause(MigrationState *s, |
2724 | int *current_active_state, |
2725 | int new_state) |
2726 | { |
2727 | if (!migrate_pause_before_switchover()) { |
2728 | return 0; |
2729 | } |
2730 | |
2731 | /* Since leaving this state is not atomic with posting the semaphore |
2732 | * it's possible that someone could have issued multiple migrate_continue |
2733 | * and the semaphore is incorrectly positive at this point; |
2734 | * the docs say it's undefined to reinit a semaphore that's already |
2735 | * init'd, so use timedwait to eat up any existing posts. |
2736 | */ |
2737 | while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) { |
2738 | /* This block intentionally left blank */ |
2739 | } |
2740 | |
2741 | qemu_mutex_unlock_iothread(); |
2742 | migrate_set_state(&s->state, *current_active_state, |
2743 | MIGRATION_STATUS_PRE_SWITCHOVER); |
2744 | qemu_sem_wait(&s->pause_sem); |
2745 | migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER, |
2746 | new_state); |
2747 | *current_active_state = new_state; |
2748 | qemu_mutex_lock_iothread(); |
2749 | |
2750 | return s->state == new_state ? 0 : -EINVAL; |
2751 | } |
2752 | |
2753 | /** |
2754 | * migration_completion: Used by migration_thread when there's not much left. |
2755 | * The caller 'breaks' the loop when this returns. |
2756 | * |
2757 | * @s: Current migration state |
2758 | */ |
2759 | static void migration_completion(MigrationState *s) |
2760 | { |
2761 | int ret; |
2762 | int current_active_state = s->state; |
2763 | |
2764 | if (s->state == MIGRATION_STATUS_ACTIVE) { |
2765 | qemu_mutex_lock_iothread(); |
2766 | s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
2767 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); |
2768 | s->vm_was_running = runstate_is_running(); |
2769 | ret = global_state_store(); |
2770 | |
2771 | if (!ret) { |
2772 | bool inactivate = !migrate_colo_enabled(); |
2773 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); |
2774 | if (ret >= 0) { |
2775 | ret = migration_maybe_pause(s, ¤t_active_state, |
2776 | MIGRATION_STATUS_DEVICE); |
2777 | } |
2778 | if (ret >= 0) { |
2779 | qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); |
2780 | ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false, |
2781 | inactivate); |
2782 | } |
2783 | if (inactivate && ret >= 0) { |
2784 | s->block_inactive = true; |
2785 | } |
2786 | } |
2787 | qemu_mutex_unlock_iothread(); |
2788 | |
2789 | if (ret < 0) { |
2790 | goto fail; |
2791 | } |
2792 | } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { |
2793 | trace_migration_completion_postcopy_end(); |
2794 | |
2795 | qemu_savevm_state_complete_postcopy(s->to_dst_file); |
2796 | trace_migration_completion_postcopy_end_after_complete(); |
2797 | } |
2798 | |
2799 | /* |
2800 | * If rp was opened we must clean up the thread before |
2801 | * cleaning everything else up (since if there are no failures |
2802 | * it will wait for the destination to send it's status in |
2803 | * a SHUT command). |
2804 | */ |
2805 | if (s->rp_state.from_dst_file) { |
2806 | int rp_error; |
2807 | trace_migration_return_path_end_before(); |
2808 | rp_error = await_return_path_close_on_source(s); |
2809 | trace_migration_return_path_end_after(rp_error); |
2810 | if (rp_error) { |
2811 | goto fail_invalidate; |
2812 | } |
2813 | } |
2814 | |
2815 | if (qemu_file_get_error(s->to_dst_file)) { |
2816 | trace_migration_completion_file_err(); |
2817 | goto fail_invalidate; |
2818 | } |
2819 | |
2820 | if (!migrate_colo_enabled()) { |
2821 | migrate_set_state(&s->state, current_active_state, |
2822 | MIGRATION_STATUS_COMPLETED); |
2823 | } |
2824 | |
2825 | return; |
2826 | |
2827 | fail_invalidate: |
2828 | /* If not doing postcopy, vm_start() will be called: let's regain |
2829 | * control on images. |
2830 | */ |
2831 | if (s->state == MIGRATION_STATUS_ACTIVE || |
2832 | s->state == MIGRATION_STATUS_DEVICE) { |
2833 | Error *local_err = NULL; |
2834 | |
2835 | qemu_mutex_lock_iothread(); |
2836 | bdrv_invalidate_cache_all(&local_err); |
2837 | if (local_err) { |
2838 | error_report_err(local_err); |
2839 | } else { |
2840 | s->block_inactive = false; |
2841 | } |
2842 | qemu_mutex_unlock_iothread(); |
2843 | } |
2844 | |
2845 | fail: |
2846 | migrate_set_state(&s->state, current_active_state, |
2847 | MIGRATION_STATUS_FAILED); |
2848 | } |
2849 | |
2850 | bool migrate_colo_enabled(void) |
2851 | { |
2852 | MigrationState *s = migrate_get_current(); |
2853 | return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO]; |
2854 | } |
2855 | |
2856 | typedef enum MigThrError { |
2857 | /* No error detected */ |
2858 | MIG_THR_ERR_NONE = 0, |
2859 | /* Detected error, but resumed successfully */ |
2860 | MIG_THR_ERR_RECOVERED = 1, |
2861 | /* Detected fatal error, need to exit */ |
2862 | MIG_THR_ERR_FATAL = 2, |
2863 | } MigThrError; |
2864 | |
2865 | static int postcopy_resume_handshake(MigrationState *s) |
2866 | { |
2867 | qemu_savevm_send_postcopy_resume(s->to_dst_file); |
2868 | |
2869 | while (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { |
2870 | qemu_sem_wait(&s->rp_state.rp_sem); |
2871 | } |
2872 | |
2873 | if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { |
2874 | return 0; |
2875 | } |
2876 | |
2877 | return -1; |
2878 | } |
2879 | |
2880 | /* Return zero if success, or <0 for error */ |
2881 | static int postcopy_do_resume(MigrationState *s) |
2882 | { |
2883 | int ret; |
2884 | |
2885 | /* |
2886 | * Call all the resume_prepare() hooks, so that modules can be |
2887 | * ready for the migration resume. |
2888 | */ |
2889 | ret = qemu_savevm_state_resume_prepare(s); |
2890 | if (ret) { |
2891 | error_report("%s: resume_prepare() failure detected: %d" , |
2892 | __func__, ret); |
2893 | return ret; |
2894 | } |
2895 | |
2896 | /* |
2897 | * Last handshake with destination on the resume (destination will |
2898 | * switch to postcopy-active afterwards) |
2899 | */ |
2900 | ret = postcopy_resume_handshake(s); |
2901 | if (ret) { |
2902 | error_report("%s: handshake failed: %d" , __func__, ret); |
2903 | return ret; |
2904 | } |
2905 | |
2906 | return 0; |
2907 | } |
2908 | |
2909 | /* |
2910 | * We don't return until we are in a safe state to continue current |
2911 | * postcopy migration. Returns MIG_THR_ERR_RECOVERED if recovered, or |
2912 | * MIG_THR_ERR_FATAL if unrecovery failure happened. |
2913 | */ |
2914 | static MigThrError postcopy_pause(MigrationState *s) |
2915 | { |
2916 | assert(s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); |
2917 | |
2918 | while (true) { |
2919 | QEMUFile *file; |
2920 | |
2921 | migrate_set_state(&s->state, s->state, |
2922 | MIGRATION_STATUS_POSTCOPY_PAUSED); |
2923 | |
2924 | /* Current channel is possibly broken. Release it. */ |
2925 | assert(s->to_dst_file); |
2926 | qemu_mutex_lock(&s->qemu_file_lock); |
2927 | file = s->to_dst_file; |
2928 | s->to_dst_file = NULL; |
2929 | qemu_mutex_unlock(&s->qemu_file_lock); |
2930 | |
2931 | qemu_file_shutdown(file); |
2932 | qemu_fclose(file); |
2933 | |
2934 | error_report("Detected IO failure for postcopy. " |
2935 | "Migration paused." ); |
2936 | |
2937 | /* |
2938 | * We wait until things fixed up. Then someone will setup the |
2939 | * status back for us. |
2940 | */ |
2941 | while (s->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { |
2942 | qemu_sem_wait(&s->postcopy_pause_sem); |
2943 | } |
2944 | |
2945 | if (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { |
2946 | /* Woken up by a recover procedure. Give it a shot */ |
2947 | |
2948 | /* |
2949 | * Firstly, let's wake up the return path now, with a new |
2950 | * return path channel. |
2951 | */ |
2952 | qemu_sem_post(&s->postcopy_pause_rp_sem); |
2953 | |
2954 | /* Do the resume logic */ |
2955 | if (postcopy_do_resume(s) == 0) { |
2956 | /* Let's continue! */ |
2957 | trace_postcopy_pause_continued(); |
2958 | return MIG_THR_ERR_RECOVERED; |
2959 | } else { |
2960 | /* |
2961 | * Something wrong happened during the recovery, let's |
2962 | * pause again. Pause is always better than throwing |
2963 | * data away. |
2964 | */ |
2965 | continue; |
2966 | } |
2967 | } else { |
2968 | /* This is not right... Time to quit. */ |
2969 | return MIG_THR_ERR_FATAL; |
2970 | } |
2971 | } |
2972 | } |
2973 | |
2974 | static MigThrError migration_detect_error(MigrationState *s) |
2975 | { |
2976 | int ret; |
2977 | int state = s->state; |
2978 | Error *local_error = NULL; |
2979 | |
2980 | if (state == MIGRATION_STATUS_CANCELLING || |
2981 | state == MIGRATION_STATUS_CANCELLED) { |
2982 | /* End the migration, but don't set the state to failed */ |
2983 | return MIG_THR_ERR_FATAL; |
2984 | } |
2985 | |
2986 | /* Try to detect any file errors */ |
2987 | ret = qemu_file_get_error_obj(s->to_dst_file, &local_error); |
2988 | if (!ret) { |
2989 | /* Everything is fine */ |
2990 | assert(!local_error); |
2991 | return MIG_THR_ERR_NONE; |
2992 | } |
2993 | |
2994 | if (local_error) { |
2995 | migrate_set_error(s, local_error); |
2996 | error_free(local_error); |
2997 | } |
2998 | |
2999 | if (state == MIGRATION_STATUS_POSTCOPY_ACTIVE && ret == -EIO) { |
3000 | /* |
3001 | * For postcopy, we allow the network to be down for a |
3002 | * while. After that, it can be continued by a |
3003 | * recovery phase. |
3004 | */ |
3005 | return postcopy_pause(s); |
3006 | } else { |
3007 | /* |
3008 | * For precopy (or postcopy with error outside IO), we fail |
3009 | * with no time. |
3010 | */ |
3011 | migrate_set_state(&s->state, state, MIGRATION_STATUS_FAILED); |
3012 | trace_migration_thread_file_err(); |
3013 | |
3014 | /* Time to stop the migration, now. */ |
3015 | return MIG_THR_ERR_FATAL; |
3016 | } |
3017 | } |
3018 | |
3019 | /* How many bytes have we transferred since the beggining of the migration */ |
3020 | static uint64_t migration_total_bytes(MigrationState *s) |
3021 | { |
3022 | return qemu_ftell(s->to_dst_file) + ram_counters.multifd_bytes; |
3023 | } |
3024 | |
3025 | static void migration_calculate_complete(MigrationState *s) |
3026 | { |
3027 | uint64_t bytes = migration_total_bytes(s); |
3028 | int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
3029 | int64_t transfer_time; |
3030 | |
3031 | s->total_time = end_time - s->start_time; |
3032 | if (!s->downtime) { |
3033 | /* |
3034 | * It's still not set, so we are precopy migration. For |
3035 | * postcopy, downtime is calculated during postcopy_start(). |
3036 | */ |
3037 | s->downtime = end_time - s->downtime_start; |
3038 | } |
3039 | |
3040 | transfer_time = s->total_time - s->setup_time; |
3041 | if (transfer_time) { |
3042 | s->mbps = ((double) bytes * 8.0) / transfer_time / 1000; |
3043 | } |
3044 | } |
3045 | |
3046 | static void update_iteration_initial_status(MigrationState *s) |
3047 | { |
3048 | /* |
3049 | * Update these three fields at the same time to avoid mismatch info lead |
3050 | * wrong speed calculation. |
3051 | */ |
3052 | s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
3053 | s->iteration_initial_bytes = migration_total_bytes(s); |
3054 | s->iteration_initial_pages = ram_get_total_transferred_pages(); |
3055 | } |
3056 | |
3057 | static void migration_update_counters(MigrationState *s, |
3058 | int64_t current_time) |
3059 | { |
3060 | uint64_t transferred, transferred_pages, time_spent; |
3061 | uint64_t current_bytes; /* bytes transferred since the beginning */ |
3062 | double bandwidth; |
3063 | |
3064 | if (current_time < s->iteration_start_time + BUFFER_DELAY) { |
3065 | return; |
3066 | } |
3067 | |
3068 | current_bytes = migration_total_bytes(s); |
3069 | transferred = current_bytes - s->iteration_initial_bytes; |
3070 | time_spent = current_time - s->iteration_start_time; |
3071 | bandwidth = (double)transferred / time_spent; |
3072 | s->threshold_size = bandwidth * s->parameters.downtime_limit; |
3073 | |
3074 | s->mbps = (((double) transferred * 8.0) / |
3075 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; |
3076 | |
3077 | transferred_pages = ram_get_total_transferred_pages() - |
3078 | s->iteration_initial_pages; |
3079 | s->pages_per_second = (double) transferred_pages / |
3080 | (((double) time_spent / 1000.0)); |
3081 | |
3082 | /* |
3083 | * if we haven't sent anything, we don't want to |
3084 | * recalculate. 10000 is a small enough number for our purposes |
3085 | */ |
3086 | if (ram_counters.dirty_pages_rate && transferred > 10000) { |
3087 | s->expected_downtime = ram_counters.remaining / bandwidth; |
3088 | } |
3089 | |
3090 | qemu_file_reset_rate_limit(s->to_dst_file); |
3091 | |
3092 | update_iteration_initial_status(s); |
3093 | |
3094 | trace_migrate_transferred(transferred, time_spent, |
3095 | bandwidth, s->threshold_size); |
3096 | } |
3097 | |
3098 | /* Migration thread iteration status */ |
3099 | typedef enum { |
3100 | MIG_ITERATE_RESUME, /* Resume current iteration */ |
3101 | MIG_ITERATE_SKIP, /* Skip current iteration */ |
3102 | MIG_ITERATE_BREAK, /* Break the loop */ |
3103 | } MigIterateState; |
3104 | |
3105 | /* |
3106 | * Return true if continue to the next iteration directly, false |
3107 | * otherwise. |
3108 | */ |
3109 | static MigIterateState migration_iteration_run(MigrationState *s) |
3110 | { |
3111 | uint64_t pending_size, pend_pre, pend_compat, pend_post; |
3112 | bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE; |
3113 | |
3114 | qemu_savevm_state_pending(s->to_dst_file, s->threshold_size, &pend_pre, |
3115 | &pend_compat, &pend_post); |
3116 | pending_size = pend_pre + pend_compat + pend_post; |
3117 | |
3118 | trace_migrate_pending(pending_size, s->threshold_size, |
3119 | pend_pre, pend_compat, pend_post); |
3120 | |
3121 | if (pending_size && pending_size >= s->threshold_size) { |
3122 | /* Still a significant amount to transfer */ |
3123 | if (!in_postcopy && pend_pre <= s->threshold_size && |
3124 | atomic_read(&s->start_postcopy)) { |
3125 | if (postcopy_start(s)) { |
3126 | error_report("%s: postcopy failed to start" , __func__); |
3127 | } |
3128 | return MIG_ITERATE_SKIP; |
3129 | } |
3130 | /* Just another iteration step */ |
3131 | qemu_savevm_state_iterate(s->to_dst_file, |
3132 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); |
3133 | } else { |
3134 | trace_migration_thread_low_pending(pending_size); |
3135 | migration_completion(s); |
3136 | return MIG_ITERATE_BREAK; |
3137 | } |
3138 | |
3139 | return MIG_ITERATE_RESUME; |
3140 | } |
3141 | |
3142 | static void migration_iteration_finish(MigrationState *s) |
3143 | { |
3144 | /* If we enabled cpu throttling for auto-converge, turn it off. */ |
3145 | cpu_throttle_stop(); |
3146 | |
3147 | qemu_mutex_lock_iothread(); |
3148 | switch (s->state) { |
3149 | case MIGRATION_STATUS_COMPLETED: |
3150 | migration_calculate_complete(s); |
3151 | runstate_set(RUN_STATE_POSTMIGRATE); |
3152 | break; |
3153 | |
3154 | case MIGRATION_STATUS_ACTIVE: |
3155 | /* |
3156 | * We should really assert here, but since it's during |
3157 | * migration, let's try to reduce the usage of assertions. |
3158 | */ |
3159 | if (!migrate_colo_enabled()) { |
3160 | error_report("%s: critical error: calling COLO code without " |
3161 | "COLO enabled" , __func__); |
3162 | } |
3163 | migrate_start_colo_process(s); |
3164 | /* |
3165 | * Fixme: we will run VM in COLO no matter its old running state. |
3166 | * After exited COLO, we will keep running. |
3167 | */ |
3168 | s->vm_was_running = true; |
3169 | /* Fallthrough */ |
3170 | case MIGRATION_STATUS_FAILED: |
3171 | case MIGRATION_STATUS_CANCELLED: |
3172 | case MIGRATION_STATUS_CANCELLING: |
3173 | if (s->vm_was_running) { |
3174 | vm_start(); |
3175 | } else { |
3176 | if (runstate_check(RUN_STATE_FINISH_MIGRATE)) { |
3177 | runstate_set(RUN_STATE_POSTMIGRATE); |
3178 | } |
3179 | } |
3180 | break; |
3181 | |
3182 | default: |
3183 | /* Should not reach here, but if so, forgive the VM. */ |
3184 | error_report("%s: Unknown ending state %d" , __func__, s->state); |
3185 | break; |
3186 | } |
3187 | migrate_fd_cleanup_schedule(s); |
3188 | qemu_mutex_unlock_iothread(); |
3189 | } |
3190 | |
3191 | void migration_make_urgent_request(void) |
3192 | { |
3193 | qemu_sem_post(&migrate_get_current()->rate_limit_sem); |
3194 | } |
3195 | |
3196 | void migration_consume_urgent_request(void) |
3197 | { |
3198 | qemu_sem_wait(&migrate_get_current()->rate_limit_sem); |
3199 | } |
3200 | |
3201 | /* |
3202 | * Master migration thread on the source VM. |
3203 | * It drives the migration and pumps the data down the outgoing channel. |
3204 | */ |
3205 | static void *migration_thread(void *opaque) |
3206 | { |
3207 | MigrationState *s = opaque; |
3208 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); |
3209 | MigThrError thr_error; |
3210 | bool urgent = false; |
3211 | |
3212 | rcu_register_thread(); |
3213 | |
3214 | object_ref(OBJECT(s)); |
3215 | update_iteration_initial_status(s); |
3216 | |
3217 | qemu_savevm_state_header(s->to_dst_file); |
3218 | |
3219 | /* |
3220 | * If we opened the return path, we need to make sure dst has it |
3221 | * opened as well. |
3222 | */ |
3223 | if (s->rp_state.from_dst_file) { |
3224 | /* Now tell the dest that it should open its end so it can reply */ |
3225 | qemu_savevm_send_open_return_path(s->to_dst_file); |
3226 | |
3227 | /* And do a ping that will make stuff easier to debug */ |
3228 | qemu_savevm_send_ping(s->to_dst_file, 1); |
3229 | } |
3230 | |
3231 | if (migrate_postcopy()) { |
3232 | /* |
3233 | * Tell the destination that we *might* want to do postcopy later; |
3234 | * if the other end can't do postcopy it should fail now, nice and |
3235 | * early. |
3236 | */ |
3237 | qemu_savevm_send_postcopy_advise(s->to_dst_file); |
3238 | } |
3239 | |
3240 | if (migrate_colo_enabled()) { |
3241 | /* Notify migration destination that we enable COLO */ |
3242 | qemu_savevm_send_colo_enable(s->to_dst_file); |
3243 | } |
3244 | |
3245 | qemu_savevm_state_setup(s->to_dst_file); |
3246 | |
3247 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; |
3248 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
3249 | MIGRATION_STATUS_ACTIVE); |
3250 | |
3251 | trace_migration_thread_setup_complete(); |
3252 | |
3253 | while (s->state == MIGRATION_STATUS_ACTIVE || |
3254 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { |
3255 | int64_t current_time; |
3256 | |
3257 | if (urgent || !qemu_file_rate_limit(s->to_dst_file)) { |
3258 | MigIterateState iter_state = migration_iteration_run(s); |
3259 | if (iter_state == MIG_ITERATE_SKIP) { |
3260 | continue; |
3261 | } else if (iter_state == MIG_ITERATE_BREAK) { |
3262 | break; |
3263 | } |
3264 | } |
3265 | |
3266 | /* |
3267 | * Try to detect any kind of failures, and see whether we |
3268 | * should stop the migration now. |
3269 | */ |
3270 | thr_error = migration_detect_error(s); |
3271 | if (thr_error == MIG_THR_ERR_FATAL) { |
3272 | /* Stop migration */ |
3273 | break; |
3274 | } else if (thr_error == MIG_THR_ERR_RECOVERED) { |
3275 | /* |
3276 | * Just recovered from a e.g. network failure, reset all |
3277 | * the local variables. This is important to avoid |
3278 | * breaking transferred_bytes and bandwidth calculation |
3279 | */ |
3280 | update_iteration_initial_status(s); |
3281 | } |
3282 | |
3283 | current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
3284 | |
3285 | migration_update_counters(s, current_time); |
3286 | |
3287 | urgent = false; |
3288 | if (qemu_file_rate_limit(s->to_dst_file)) { |
3289 | /* Wait for a delay to do rate limiting OR |
3290 | * something urgent to post the semaphore. |
3291 | */ |
3292 | int ms = s->iteration_start_time + BUFFER_DELAY - current_time; |
3293 | trace_migration_thread_ratelimit_pre(ms); |
3294 | if (qemu_sem_timedwait(&s->rate_limit_sem, ms) == 0) { |
3295 | /* We were worken by one or more urgent things but |
3296 | * the timedwait will have consumed one of them. |
3297 | * The service routine for the urgent wake will dec |
3298 | * the semaphore itself for each item it consumes, |
3299 | * so add this one we just eat back. |
3300 | */ |
3301 | qemu_sem_post(&s->rate_limit_sem); |
3302 | urgent = true; |
3303 | } |
3304 | trace_migration_thread_ratelimit_post(urgent); |
3305 | } |
3306 | } |
3307 | |
3308 | trace_migration_thread_after_loop(); |
3309 | migration_iteration_finish(s); |
3310 | object_unref(OBJECT(s)); |
3311 | rcu_unregister_thread(); |
3312 | return NULL; |
3313 | } |
3314 | |
3315 | void migrate_fd_connect(MigrationState *s, Error *error_in) |
3316 | { |
3317 | int64_t rate_limit; |
3318 | bool resume = s->state == MIGRATION_STATUS_POSTCOPY_PAUSED; |
3319 | |
3320 | s->expected_downtime = s->parameters.downtime_limit; |
3321 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup_bh, s); |
3322 | if (error_in) { |
3323 | migrate_fd_error(s, error_in); |
3324 | migrate_fd_cleanup(s); |
3325 | return; |
3326 | } |
3327 | |
3328 | if (resume) { |
3329 | /* This is a resumed migration */ |
3330 | rate_limit = INT64_MAX; |
3331 | } else { |
3332 | /* This is a fresh new migration */ |
3333 | rate_limit = s->parameters.max_bandwidth / XFER_LIMIT_RATIO; |
3334 | |
3335 | /* Notify before starting migration thread */ |
3336 | notifier_list_notify(&migration_state_notifiers, s); |
3337 | } |
3338 | |
3339 | qemu_file_set_rate_limit(s->to_dst_file, rate_limit); |
3340 | qemu_file_set_blocking(s->to_dst_file, true); |
3341 | |
3342 | /* |
3343 | * Open the return path. For postcopy, it is used exclusively. For |
3344 | * precopy, only if user specified "return-path" capability would |
3345 | * QEMU uses the return path. |
3346 | */ |
3347 | if (migrate_postcopy_ram() || migrate_use_return_path()) { |
3348 | if (open_return_path_on_source(s, !resume)) { |
3349 | error_report("Unable to open return-path for postcopy" ); |
3350 | migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED); |
3351 | migrate_fd_cleanup(s); |
3352 | return; |
3353 | } |
3354 | } |
3355 | |
3356 | if (resume) { |
3357 | /* Wakeup the main migration thread to do the recovery */ |
3358 | migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_PAUSED, |
3359 | MIGRATION_STATUS_POSTCOPY_RECOVER); |
3360 | qemu_sem_post(&s->postcopy_pause_sem); |
3361 | return; |
3362 | } |
3363 | |
3364 | if (multifd_save_setup() != 0) { |
3365 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
3366 | MIGRATION_STATUS_FAILED); |
3367 | migrate_fd_cleanup(s); |
3368 | return; |
3369 | } |
3370 | qemu_thread_create(&s->thread, "live_migration" , migration_thread, s, |
3371 | QEMU_THREAD_JOINABLE); |
3372 | s->migration_thread_running = true; |
3373 | } |
3374 | |
3375 | void migration_global_dump(Monitor *mon) |
3376 | { |
3377 | MigrationState *ms = migrate_get_current(); |
3378 | |
3379 | monitor_printf(mon, "globals:\n" ); |
3380 | monitor_printf(mon, "store-global-state: %s\n" , |
3381 | ms->store_global_state ? "on" : "off" ); |
3382 | monitor_printf(mon, "only-migratable: %s\n" , |
3383 | only_migratable ? "on" : "off" ); |
3384 | monitor_printf(mon, "send-configuration: %s\n" , |
3385 | ms->send_configuration ? "on" : "off" ); |
3386 | monitor_printf(mon, "send-section-footer: %s\n" , |
3387 | ms->send_section_footer ? "on" : "off" ); |
3388 | monitor_printf(mon, "decompress-error-check: %s\n" , |
3389 | ms->decompress_error_check ? "on" : "off" ); |
3390 | monitor_printf(mon, "clear-bitmap-shift: %u\n" , |
3391 | ms->clear_bitmap_shift); |
3392 | } |
3393 | |
3394 | #define DEFINE_PROP_MIG_CAP(name, x) \ |
3395 | DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false) |
3396 | |
3397 | static Property migration_properties[] = { |
3398 | DEFINE_PROP_BOOL("store-global-state" , MigrationState, |
3399 | store_global_state, true), |
3400 | DEFINE_PROP_BOOL("send-configuration" , MigrationState, |
3401 | send_configuration, true), |
3402 | DEFINE_PROP_BOOL("send-section-footer" , MigrationState, |
3403 | send_section_footer, true), |
3404 | DEFINE_PROP_BOOL("decompress-error-check" , MigrationState, |
3405 | decompress_error_check, true), |
3406 | DEFINE_PROP_UINT8("x-clear-bitmap-shift" , MigrationState, |
3407 | clear_bitmap_shift, CLEAR_BITMAP_SHIFT_DEFAULT), |
3408 | |
3409 | /* Migration parameters */ |
3410 | DEFINE_PROP_UINT8("x-compress-level" , MigrationState, |
3411 | parameters.compress_level, |
3412 | DEFAULT_MIGRATE_COMPRESS_LEVEL), |
3413 | DEFINE_PROP_UINT8("x-compress-threads" , MigrationState, |
3414 | parameters.compress_threads, |
3415 | DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT), |
3416 | DEFINE_PROP_BOOL("x-compress-wait-thread" , MigrationState, |
3417 | parameters.compress_wait_thread, true), |
3418 | DEFINE_PROP_UINT8("x-decompress-threads" , MigrationState, |
3419 | parameters.decompress_threads, |
3420 | DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT), |
3421 | DEFINE_PROP_UINT8("x-cpu-throttle-initial" , MigrationState, |
3422 | parameters.cpu_throttle_initial, |
3423 | DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL), |
3424 | DEFINE_PROP_UINT8("x-cpu-throttle-increment" , MigrationState, |
3425 | parameters.cpu_throttle_increment, |
3426 | DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT), |
3427 | DEFINE_PROP_SIZE("x-max-bandwidth" , MigrationState, |
3428 | parameters.max_bandwidth, MAX_THROTTLE), |
3429 | DEFINE_PROP_UINT64("x-downtime-limit" , MigrationState, |
3430 | parameters.downtime_limit, |
3431 | DEFAULT_MIGRATE_SET_DOWNTIME), |
3432 | DEFINE_PROP_UINT32("x-checkpoint-delay" , MigrationState, |
3433 | parameters.x_checkpoint_delay, |
3434 | DEFAULT_MIGRATE_X_CHECKPOINT_DELAY), |
3435 | DEFINE_PROP_UINT8("multifd-channels" , MigrationState, |
3436 | parameters.multifd_channels, |
3437 | DEFAULT_MIGRATE_MULTIFD_CHANNELS), |
3438 | DEFINE_PROP_SIZE("xbzrle-cache-size" , MigrationState, |
3439 | parameters.xbzrle_cache_size, |
3440 | DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE), |
3441 | DEFINE_PROP_SIZE("max-postcopy-bandwidth" , MigrationState, |
3442 | parameters.max_postcopy_bandwidth, |
3443 | DEFAULT_MIGRATE_MAX_POSTCOPY_BANDWIDTH), |
3444 | DEFINE_PROP_UINT8("max-cpu-throttle" , MigrationState, |
3445 | parameters.max_cpu_throttle, |
3446 | DEFAULT_MIGRATE_MAX_CPU_THROTTLE), |
3447 | DEFINE_PROP_SIZE("announce-initial" , MigrationState, |
3448 | parameters.announce_initial, |
3449 | DEFAULT_MIGRATE_ANNOUNCE_INITIAL), |
3450 | DEFINE_PROP_SIZE("announce-max" , MigrationState, |
3451 | parameters.announce_max, |
3452 | DEFAULT_MIGRATE_ANNOUNCE_MAX), |
3453 | DEFINE_PROP_SIZE("announce-rounds" , MigrationState, |
3454 | parameters.announce_rounds, |
3455 | DEFAULT_MIGRATE_ANNOUNCE_ROUNDS), |
3456 | DEFINE_PROP_SIZE("announce-step" , MigrationState, |
3457 | parameters.announce_step, |
3458 | DEFAULT_MIGRATE_ANNOUNCE_STEP), |
3459 | |
3460 | /* Migration capabilities */ |
3461 | DEFINE_PROP_MIG_CAP("x-xbzrle" , MIGRATION_CAPABILITY_XBZRLE), |
3462 | DEFINE_PROP_MIG_CAP("x-rdma-pin-all" , MIGRATION_CAPABILITY_RDMA_PIN_ALL), |
3463 | DEFINE_PROP_MIG_CAP("x-auto-converge" , MIGRATION_CAPABILITY_AUTO_CONVERGE), |
3464 | DEFINE_PROP_MIG_CAP("x-zero-blocks" , MIGRATION_CAPABILITY_ZERO_BLOCKS), |
3465 | DEFINE_PROP_MIG_CAP("x-compress" , MIGRATION_CAPABILITY_COMPRESS), |
3466 | DEFINE_PROP_MIG_CAP("x-events" , MIGRATION_CAPABILITY_EVENTS), |
3467 | DEFINE_PROP_MIG_CAP("x-postcopy-ram" , MIGRATION_CAPABILITY_POSTCOPY_RAM), |
3468 | DEFINE_PROP_MIG_CAP("x-colo" , MIGRATION_CAPABILITY_X_COLO), |
3469 | DEFINE_PROP_MIG_CAP("x-release-ram" , MIGRATION_CAPABILITY_RELEASE_RAM), |
3470 | DEFINE_PROP_MIG_CAP("x-block" , MIGRATION_CAPABILITY_BLOCK), |
3471 | DEFINE_PROP_MIG_CAP("x-return-path" , MIGRATION_CAPABILITY_RETURN_PATH), |
3472 | DEFINE_PROP_MIG_CAP("x-multifd" , MIGRATION_CAPABILITY_MULTIFD), |
3473 | |
3474 | DEFINE_PROP_END_OF_LIST(), |
3475 | }; |
3476 | |
3477 | static void migration_class_init(ObjectClass *klass, void *data) |
3478 | { |
3479 | DeviceClass *dc = DEVICE_CLASS(klass); |
3480 | |
3481 | dc->user_creatable = false; |
3482 | dc->props = migration_properties; |
3483 | } |
3484 | |
3485 | static void migration_instance_finalize(Object *obj) |
3486 | { |
3487 | MigrationState *ms = MIGRATION_OBJ(obj); |
3488 | MigrationParameters *params = &ms->parameters; |
3489 | |
3490 | qemu_mutex_destroy(&ms->error_mutex); |
3491 | qemu_mutex_destroy(&ms->qemu_file_lock); |
3492 | g_free(params->tls_hostname); |
3493 | g_free(params->tls_creds); |
3494 | qemu_sem_destroy(&ms->rate_limit_sem); |
3495 | qemu_sem_destroy(&ms->pause_sem); |
3496 | qemu_sem_destroy(&ms->postcopy_pause_sem); |
3497 | qemu_sem_destroy(&ms->postcopy_pause_rp_sem); |
3498 | qemu_sem_destroy(&ms->rp_state.rp_sem); |
3499 | error_free(ms->error); |
3500 | } |
3501 | |
3502 | static void migration_instance_init(Object *obj) |
3503 | { |
3504 | MigrationState *ms = MIGRATION_OBJ(obj); |
3505 | MigrationParameters *params = &ms->parameters; |
3506 | |
3507 | ms->state = MIGRATION_STATUS_NONE; |
3508 | ms->mbps = -1; |
3509 | ms->pages_per_second = -1; |
3510 | qemu_sem_init(&ms->pause_sem, 0); |
3511 | qemu_mutex_init(&ms->error_mutex); |
3512 | |
3513 | params->tls_hostname = g_strdup("" ); |
3514 | params->tls_creds = g_strdup("" ); |
3515 | |
3516 | /* Set has_* up only for parameter checks */ |
3517 | params->has_compress_level = true; |
3518 | params->has_compress_threads = true; |
3519 | params->has_decompress_threads = true; |
3520 | params->has_cpu_throttle_initial = true; |
3521 | params->has_cpu_throttle_increment = true; |
3522 | params->has_max_bandwidth = true; |
3523 | params->has_downtime_limit = true; |
3524 | params->has_x_checkpoint_delay = true; |
3525 | params->has_block_incremental = true; |
3526 | params->has_multifd_channels = true; |
3527 | params->has_xbzrle_cache_size = true; |
3528 | params->has_max_postcopy_bandwidth = true; |
3529 | params->has_max_cpu_throttle = true; |
3530 | params->has_announce_initial = true; |
3531 | params->has_announce_max = true; |
3532 | params->has_announce_rounds = true; |
3533 | params->has_announce_step = true; |
3534 | |
3535 | qemu_sem_init(&ms->postcopy_pause_sem, 0); |
3536 | qemu_sem_init(&ms->postcopy_pause_rp_sem, 0); |
3537 | qemu_sem_init(&ms->rp_state.rp_sem, 0); |
3538 | qemu_sem_init(&ms->rate_limit_sem, 0); |
3539 | qemu_mutex_init(&ms->qemu_file_lock); |
3540 | } |
3541 | |
3542 | /* |
3543 | * Return true if check pass, false otherwise. Error will be put |
3544 | * inside errp if provided. |
3545 | */ |
3546 | static bool migration_object_check(MigrationState *ms, Error **errp) |
3547 | { |
3548 | MigrationCapabilityStatusList *head = NULL; |
3549 | /* Assuming all off */ |
3550 | bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret; |
3551 | int i; |
3552 | |
3553 | if (!migrate_params_check(&ms->parameters, errp)) { |
3554 | return false; |
3555 | } |
3556 | |
3557 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { |
3558 | if (ms->enabled_capabilities[i]) { |
3559 | head = migrate_cap_add(head, i, true); |
3560 | } |
3561 | } |
3562 | |
3563 | ret = migrate_caps_check(cap_list, head, errp); |
3564 | |
3565 | /* It works with head == NULL */ |
3566 | qapi_free_MigrationCapabilityStatusList(head); |
3567 | |
3568 | return ret; |
3569 | } |
3570 | |
3571 | static const TypeInfo migration_type = { |
3572 | .name = TYPE_MIGRATION, |
3573 | /* |
3574 | * NOTE: TYPE_MIGRATION is not really a device, as the object is |
3575 | * not created using qdev_create(), it is not attached to the qdev |
3576 | * device tree, and it is never realized. |
3577 | * |
3578 | * TODO: Make this TYPE_OBJECT once QOM provides something like |
3579 | * TYPE_DEVICE's "-global" properties. |
3580 | */ |
3581 | .parent = TYPE_DEVICE, |
3582 | .class_init = migration_class_init, |
3583 | .class_size = sizeof(MigrationClass), |
3584 | .instance_size = sizeof(MigrationState), |
3585 | .instance_init = migration_instance_init, |
3586 | .instance_finalize = migration_instance_finalize, |
3587 | }; |
3588 | |
3589 | static void register_migration_types(void) |
3590 | { |
3591 | type_register_static(&migration_type); |
3592 | } |
3593 | |
3594 | type_init(register_migration_types); |
3595 | |