]> git.proxmox.com Git - mirror_qemu.git/blame - migration/colo.c
migration/ram.c: Remove the qemu_mutex_lock in colo_flush_ram_cache.
[mirror_qemu.git] / migration / colo.c
CommitLineData
35a6ed4f
HZ
1/*
2 * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
3 * (a.k.a. Fault Tolerance or Continuous Replication)
4 *
5 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
6 * Copyright (c) 2016 FUJITSU LIMITED
7 * Copyright (c) 2016 Intel Corporation
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2 or
10 * later. See the COPYING file in the top-level directory.
11 */
12
13#include "qemu/osdep.h"
0b827d5e 14#include "sysemu/sysemu.h"
e688df6b 15#include "qapi/error.h"
9af23989 16#include "qapi/qapi-commands-migration.h"
40014d81 17#include "qemu-file-channel.h"
6666c96a 18#include "migration.h"
08a0aee1 19#include "qemu-file.h"
20a519a0 20#include "savevm.h"
35a6ed4f 21#include "migration/colo.h"
2c9e6fec 22#include "block.h"
a91246c9 23#include "io/channel-buffer.h"
0b827d5e 24#include "trace.h"
56ba83d2 25#include "qemu/error-report.h"
db725815 26#include "qemu/main-loop.h"
d4842052 27#include "qemu/rcu.h"
d89e666e 28#include "migration/failover.h"
0393031a 29#include "migration/ram.h"
335d10cd 30#ifdef CONFIG_REPLICATION
b0262955 31#include "block/replication.h"
335d10cd 32#endif
131b2153
ZC
33#include "net/colo-compare.h"
34#include "net/colo.h"
8e48ac95 35#include "block/block.h"
9ecff6d6 36#include "qapi/qapi-events-migration.h"
f56c0065 37#include "qapi/qmp/qerror.h"
3f6df99d 38#include "sysemu/cpus.h"
54d31236 39#include "sysemu/runstate.h"
7b343530 40#include "net/filter.h"
35a6ed4f 41
a8664ba5 42static bool vmstate_loading;
131b2153 43static Notifier packets_compare_notifier;
a8664ba5 44
5ed0deca
ZC
45/* User need to know colo mode after COLO failover */
46static COLOMode last_colo_mode;
47
a91246c9
HZ
48#define COLO_BUFFER_BASE_SIZE (4 * 1024 * 1024)
49
0b827d5e
HZ
50bool migration_in_colo_state(void)
51{
52 MigrationState *s = migrate_get_current();
53
54 return (s->state == MIGRATION_STATUS_COLO);
55}
56
25d0c16f
HZ
57bool migration_incoming_in_colo_state(void)
58{
59 MigrationIncomingState *mis = migration_incoming_get_current();
60
61 return mis && (mis->state == MIGRATION_STATUS_COLO);
62}
63
b3f7f0c5
HZ
64static bool colo_runstate_is_stopped(void)
65{
66 return runstate_check(RUN_STATE_COLO) || !runstate_is_running();
67}
68
9d2db376
HZ
69static void secondary_vm_do_failover(void)
70{
3ebb9c4f
ZC
71/* COLO needs enable block-replication */
72#ifdef CONFIG_REPLICATION
9d2db376
HZ
73 int old_state;
74 MigrationIncomingState *mis = migration_incoming_get_current();
8e48ac95 75 Error *local_err = NULL;
9d2db376 76
a8664ba5
HZ
77 /* Can not do failover during the process of VM's loading VMstate, Or
78 * it will break the secondary VM.
79 */
80 if (vmstate_loading) {
81 old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
82 FAILOVER_STATUS_RELAUNCH);
83 if (old_state != FAILOVER_STATUS_ACTIVE) {
84 error_report("Unknown error while do failover for secondary VM,"
977c736f 85 "old_state: %s", FailoverStatus_str(old_state));
a8664ba5
HZ
86 }
87 return;
88 }
89
9d2db376
HZ
90 migrate_set_state(&mis->state, MIGRATION_STATUS_COLO,
91 MIGRATION_STATUS_COMPLETED);
92
8e48ac95
ZC
93 replication_stop_all(true, &local_err);
94 if (local_err) {
95 error_report_err(local_err);
27d07fcf 96 local_err = NULL;
8e48ac95
ZC
97 }
98
7b343530
HZ
99 /* Notify all filters of all NIC to do checkpoint */
100 colo_notify_filters_event(COLO_EVENT_FAILOVER, &local_err);
101 if (local_err) {
102 error_report_err(local_err);
103 }
104
9d2db376
HZ
105 if (!autostart) {
106 error_report("\"-S\" qemu option will be ignored in secondary side");
107 /* recover runstate to normal migration finish state */
108 autostart = true;
109 }
c937b9a6
HZ
110 /*
111 * Make sure COLO incoming thread not block in recv or send,
112 * If mis->from_src_file and mis->to_src_file use the same fd,
113 * The second shutdown() will return -1, we ignore this value,
114 * It is harmless.
115 */
116 if (mis->from_src_file) {
117 qemu_file_shutdown(mis->from_src_file);
118 }
119 if (mis->to_src_file) {
120 qemu_file_shutdown(mis->to_src_file);
121 }
9d2db376
HZ
122
123 old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
124 FAILOVER_STATUS_COMPLETED);
125 if (old_state != FAILOVER_STATUS_ACTIVE) {
126 error_report("Incorrect state (%s) while doing failover for "
977c736f 127 "secondary VM", FailoverStatus_str(old_state));
9d2db376
HZ
128 return;
129 }
c937b9a6
HZ
130 /* Notify COLO incoming thread that failover work is finished */
131 qemu_sem_post(&mis->colo_incoming_sem);
1fe6ab26 132
9d2db376
HZ
133 /* For Secondary VM, jump to incoming co */
134 if (mis->migration_incoming_co) {
135 qemu_coroutine_enter(mis->migration_incoming_co);
136 }
3ebb9c4f
ZC
137#else
138 abort();
139#endif
9d2db376
HZ
140}
141
b3f7f0c5
HZ
142static void primary_vm_do_failover(void)
143{
3ebb9c4f 144#ifdef CONFIG_REPLICATION
b3f7f0c5
HZ
145 MigrationState *s = migrate_get_current();
146 int old_state;
8e48ac95 147 Error *local_err = NULL;
b3f7f0c5
HZ
148
149 migrate_set_state(&s->state, MIGRATION_STATUS_COLO,
150 MIGRATION_STATUS_COMPLETED);
2518aec1
HZ
151 /*
152 * kick COLO thread which might wait at
153 * qemu_sem_wait(&s->colo_checkpoint_sem).
154 */
ae4c2099 155 colo_checkpoint_notify(s);
b3f7f0c5 156
c937b9a6
HZ
157 /*
158 * Wake up COLO thread which may blocked in recv() or send(),
159 * The s->rp_state.from_dst_file and s->to_dst_file may use the
160 * same fd, but we still shutdown the fd for twice, it is harmless.
161 */
162 if (s->to_dst_file) {
163 qemu_file_shutdown(s->to_dst_file);
164 }
165 if (s->rp_state.from_dst_file) {
166 qemu_file_shutdown(s->rp_state.from_dst_file);
167 }
168
b3f7f0c5
HZ
169 old_state = failover_set_state(FAILOVER_STATUS_ACTIVE,
170 FAILOVER_STATUS_COMPLETED);
171 if (old_state != FAILOVER_STATUS_ACTIVE) {
172 error_report("Incorrect state (%s) while doing failover for Primary VM",
977c736f 173 FailoverStatus_str(old_state));
b3f7f0c5
HZ
174 return;
175 }
8e48ac95
ZC
176
177 replication_stop_all(true, &local_err);
178 if (local_err) {
179 error_report_err(local_err);
180 local_err = NULL;
181 }
182
c937b9a6
HZ
183 /* Notify COLO thread that failover work is finished */
184 qemu_sem_post(&s->colo_exit_sem);
3ebb9c4f
ZC
185#else
186 abort();
187#endif
b3f7f0c5
HZ
188}
189
aad555c2
ZC
190COLOMode get_colo_mode(void)
191{
192 if (migration_in_colo_state()) {
193 return COLO_MODE_PRIMARY;
194 } else if (migration_incoming_in_colo_state()) {
195 return COLO_MODE_SECONDARY;
196 } else {
41b6b779 197 return COLO_MODE_NONE;
aad555c2
ZC
198 }
199}
200
c0913d1d 201void colo_do_failover(void)
b3f7f0c5
HZ
202{
203 /* Make sure VM stopped while failover happened. */
204 if (!colo_runstate_is_stopped()) {
205 vm_stop_force_state(RUN_STATE_COLO);
206 }
207
2b9f6bf3 208 switch (last_colo_mode = get_colo_mode()) {
82cd368c 209 case COLO_MODE_PRIMARY:
b3f7f0c5 210 primary_vm_do_failover();
82cd368c
ZC
211 break;
212 case COLO_MODE_SECONDARY:
9d2db376 213 secondary_vm_do_failover();
82cd368c
ZC
214 break;
215 default:
216 error_report("colo_do_failover failed because the colo mode"
217 " could not be obtained");
b3f7f0c5
HZ
218 }
219}
220
335d10cd 221#ifdef CONFIG_REPLICATION
2c9639ec
ZC
222void qmp_xen_set_replication(bool enable, bool primary,
223 bool has_failover, bool failover,
224 Error **errp)
225{
226 ReplicationMode mode = primary ?
227 REPLICATION_MODE_PRIMARY :
228 REPLICATION_MODE_SECONDARY;
229
230 if (has_failover && enable) {
231 error_setg(errp, "Parameter 'failover' is only for"
232 " stopping replication");
233 return;
234 }
235
236 if (enable) {
237 replication_start_all(mode, errp);
238 } else {
239 if (!has_failover) {
240 failover = NULL;
241 }
242 replication_stop_all(failover, failover ? NULL : errp);
243 }
244}
245
daa33c52
ZC
246ReplicationStatus *qmp_query_xen_replication_status(Error **errp)
247{
248 Error *err = NULL;
249 ReplicationStatus *s = g_new0(ReplicationStatus, 1);
250
251 replication_get_error_all(&err);
252 if (err) {
253 s->error = true;
254 s->has_desc = true;
255 s->desc = g_strdup(error_get_pretty(err));
256 } else {
257 s->error = false;
258 }
259
260 error_free(err);
261 return s;
262}
263
264void qmp_xen_colo_do_checkpoint(Error **errp)
265{
735527e1
MA
266 Error *err = NULL;
267
268 replication_do_checkpoint_all(&err);
269 if (err) {
270 error_propagate(errp, err);
271 return;
272 }
0e8818f0
ZC
273 /* Notify all filters of all NIC to do checkpoint */
274 colo_notify_filters_event(COLO_EVENT_CHECKPOINT, errp);
daa33c52 275}
335d10cd 276#endif
daa33c52 277
f56c0065
ZC
278COLOStatus *qmp_query_colo_status(Error **errp)
279{
280 COLOStatus *s = g_new0(COLOStatus, 1);
281
282 s->mode = get_colo_mode();
5ed0deca 283 s->last_mode = last_colo_mode;
f56c0065
ZC
284
285 switch (failover_get_state()) {
286 case FAILOVER_STATUS_NONE:
287 s->reason = COLO_EXIT_REASON_NONE;
288 break;
1fe6ab26 289 case FAILOVER_STATUS_COMPLETED:
f56c0065
ZC
290 s->reason = COLO_EXIT_REASON_REQUEST;
291 break;
292 default:
3a43ac47
ZC
293 if (migration_in_colo_state()) {
294 s->reason = COLO_EXIT_REASON_PROCESSING;
295 } else {
296 s->reason = COLO_EXIT_REASON_ERROR;
297 }
f56c0065
ZC
298 }
299
300 return s;
301}
302
4f97558e
HZ
303static void colo_send_message(QEMUFile *f, COLOMessage msg,
304 Error **errp)
305{
306 int ret;
307
308 if (msg >= COLO_MESSAGE__MAX) {
309 error_setg(errp, "%s: Invalid message", __func__);
310 return;
311 }
312 qemu_put_be32(f, msg);
313 qemu_fflush(f);
314
315 ret = qemu_file_get_error(f);
316 if (ret < 0) {
317 error_setg_errno(errp, -ret, "Can't send COLO message");
318 }
977c736f 319 trace_colo_send_message(COLOMessage_str(msg));
4f97558e
HZ
320}
321
a91246c9
HZ
322static void colo_send_message_value(QEMUFile *f, COLOMessage msg,
323 uint64_t value, Error **errp)
324{
325 Error *local_err = NULL;
326 int ret;
327
328 colo_send_message(f, msg, &local_err);
329 if (local_err) {
330 error_propagate(errp, local_err);
331 return;
332 }
333 qemu_put_be64(f, value);
334 qemu_fflush(f);
335
336 ret = qemu_file_get_error(f);
337 if (ret < 0) {
338 error_setg_errno(errp, -ret, "Failed to send value for message:%s",
977c736f 339 COLOMessage_str(msg));
a91246c9
HZ
340 }
341}
342
4f97558e
HZ
343static COLOMessage colo_receive_message(QEMUFile *f, Error **errp)
344{
345 COLOMessage msg;
346 int ret;
347
348 msg = qemu_get_be32(f);
349 ret = qemu_file_get_error(f);
350 if (ret < 0) {
351 error_setg_errno(errp, -ret, "Can't receive COLO message");
352 return msg;
353 }
354 if (msg >= COLO_MESSAGE__MAX) {
355 error_setg(errp, "%s: Invalid message", __func__);
356 return msg;
357 }
977c736f 358 trace_colo_receive_message(COLOMessage_str(msg));
4f97558e
HZ
359 return msg;
360}
361
362static void colo_receive_check_message(QEMUFile *f, COLOMessage expect_msg,
363 Error **errp)
364{
365 COLOMessage msg;
366 Error *local_err = NULL;
367
368 msg = colo_receive_message(f, &local_err);
369 if (local_err) {
370 error_propagate(errp, local_err);
371 return;
372 }
373 if (msg != expect_msg) {
374 error_setg(errp, "Unexpected COLO message %d, expected %d",
375 msg, expect_msg);
376 }
377}
378
4291d372
HZ
379static uint64_t colo_receive_message_value(QEMUFile *f, uint32_t expect_msg,
380 Error **errp)
381{
382 Error *local_err = NULL;
383 uint64_t value;
384 int ret;
385
386 colo_receive_check_message(f, expect_msg, &local_err);
387 if (local_err) {
388 error_propagate(errp, local_err);
389 return 0;
390 }
391
392 value = qemu_get_be64(f);
393 ret = qemu_file_get_error(f);
394 if (ret < 0) {
395 error_setg_errno(errp, -ret, "Failed to get value for COLO message: %s",
977c736f 396 COLOMessage_str(expect_msg));
4291d372
HZ
397 }
398 return value;
399}
400
a91246c9
HZ
401static int colo_do_checkpoint_transaction(MigrationState *s,
402 QIOChannelBuffer *bioc,
403 QEMUFile *fb)
4f97558e
HZ
404{
405 Error *local_err = NULL;
a91246c9 406 int ret = -1;
4f97558e
HZ
407
408 colo_send_message(s->to_dst_file, COLO_MESSAGE_CHECKPOINT_REQUEST,
409 &local_err);
410 if (local_err) {
411 goto out;
412 }
413
414 colo_receive_check_message(s->rp_state.from_dst_file,
415 COLO_MESSAGE_CHECKPOINT_REPLY, &local_err);
416 if (local_err) {
417 goto out;
418 }
a91246c9
HZ
419 /* Reset channel-buffer directly */
420 qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
421 bioc->usage = 0;
4f97558e 422
a91246c9 423 qemu_mutex_lock_iothread();
b3f7f0c5
HZ
424 if (failover_get_state() != FAILOVER_STATUS_NONE) {
425 qemu_mutex_unlock_iothread();
426 goto out;
427 }
a91246c9
HZ
428 vm_stop_force_state(RUN_STATE_COLO);
429 qemu_mutex_unlock_iothread();
430 trace_colo_vm_state_change("run", "stop");
b3f7f0c5
HZ
431 /*
432 * Failover request bh could be called after vm_stop_force_state(),
433 * So we need check failover_request_is_active() again.
434 */
435 if (failover_get_state() != FAILOVER_STATUS_NONE) {
436 goto out;
437 }
a91246c9 438 qemu_mutex_lock_iothread();
3ebb9c4f
ZC
439
440#ifdef CONFIG_REPLICATION
8e48ac95
ZC
441 replication_do_checkpoint_all(&local_err);
442 if (local_err) {
443 qemu_mutex_unlock_iothread();
444 goto out;
445 }
3ebb9c4f
ZC
446#else
447 abort();
448#endif
4f97558e
HZ
449
450 colo_send_message(s->to_dst_file, COLO_MESSAGE_VMSTATE_SEND, &local_err);
451 if (local_err) {
3f6df99d
ZC
452 qemu_mutex_unlock_iothread();
453 goto out;
454 }
455 /* Note: device state is saved into buffer */
456 ret = qemu_save_device_state(fb);
457
458 qemu_mutex_unlock_iothread();
459 if (ret < 0) {
4f97558e
HZ
460 goto out;
461 }
91fe9a8d
RL
462
463 if (migrate_auto_converge()) {
464 mig_throttle_counter_reset();
465 }
3f6df99d
ZC
466 /*
467 * Only save VM's live state, which not including device state.
468 * TODO: We may need a timeout mechanism to prevent COLO process
469 * to be blocked here.
470 */
471 qemu_savevm_live_state(s->to_dst_file);
472
473 qemu_fflush(fb);
474
a91246c9
HZ
475 /*
476 * We need the size of the VMstate data in Secondary side,
477 * With which we can decide how much data should be read.
478 */
479 colo_send_message_value(s->to_dst_file, COLO_MESSAGE_VMSTATE_SIZE,
480 bioc->usage, &local_err);
481 if (local_err) {
482 goto out;
483 }
4f97558e 484
a91246c9
HZ
485 qemu_put_buffer(s->to_dst_file, bioc->data, bioc->usage);
486 qemu_fflush(s->to_dst_file);
487 ret = qemu_file_get_error(s->to_dst_file);
488 if (ret < 0) {
489 goto out;
490 }
4f97558e
HZ
491
492 colo_receive_check_message(s->rp_state.from_dst_file,
493 COLO_MESSAGE_VMSTATE_RECEIVED, &local_err);
494 if (local_err) {
495 goto out;
496 }
497
4fa8ed25
LS
498 qemu_event_reset(&s->colo_checkpoint_event);
499 colo_notify_compares_event(NULL, COLO_EVENT_CHECKPOINT, &local_err);
500 if (local_err) {
501 goto out;
502 }
503
4f97558e
HZ
504 colo_receive_check_message(s->rp_state.from_dst_file,
505 COLO_MESSAGE_VMSTATE_LOADED, &local_err);
506 if (local_err) {
507 goto out;
508 }
509
a91246c9
HZ
510 ret = 0;
511
512 qemu_mutex_lock_iothread();
513 vm_start();
514 qemu_mutex_unlock_iothread();
515 trace_colo_vm_state_change("stop", "run");
4f97558e 516
4f97558e
HZ
517out:
518 if (local_err) {
519 error_report_err(local_err);
520 }
a91246c9 521 return ret;
4f97558e
HZ
522}
523
131b2153
ZC
524static void colo_compare_notify_checkpoint(Notifier *notifier, void *data)
525{
526 colo_checkpoint_notify(data);
527}
528
0b827d5e
HZ
529static void colo_process_checkpoint(MigrationState *s)
530{
a91246c9
HZ
531 QIOChannelBuffer *bioc;
532 QEMUFile *fb = NULL;
479125d5 533 int64_t current_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
4f97558e
HZ
534 Error *local_err = NULL;
535 int ret;
536
2b9f6bf3 537 if (get_colo_mode() != COLO_MODE_PRIMARY) {
5ed0deca
ZC
538 error_report("COLO mode must be COLO_MODE_PRIMARY");
539 return;
540 }
541
aef06085
HZ
542 failover_init_state();
543
56ba83d2
HZ
544 s->rp_state.from_dst_file = qemu_file_get_return_path(s->to_dst_file);
545 if (!s->rp_state.from_dst_file) {
546 error_report("Open QEMUFile from_dst_file failed");
547 goto out;
548 }
549
131b2153
ZC
550 packets_compare_notifier.notify = colo_compare_notify_checkpoint;
551 colo_compare_register_notifier(&packets_compare_notifier);
552
4f97558e
HZ
553 /*
554 * Wait for Secondary finish loading VM states and enter COLO
555 * restore.
556 */
557 colo_receive_check_message(s->rp_state.from_dst_file,
558 COLO_MESSAGE_CHECKPOINT_READY, &local_err);
559 if (local_err) {
560 goto out;
561 }
a91246c9
HZ
562 bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
563 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
564 object_unref(OBJECT(bioc));
4f97558e 565
0b827d5e 566 qemu_mutex_lock_iothread();
3ebb9c4f 567#ifdef CONFIG_REPLICATION
8e48ac95
ZC
568 replication_start_all(REPLICATION_MODE_PRIMARY, &local_err);
569 if (local_err) {
570 qemu_mutex_unlock_iothread();
571 goto out;
572 }
3ebb9c4f
ZC
573#else
574 abort();
575#endif
8e48ac95 576
0b827d5e
HZ
577 vm_start();
578 qemu_mutex_unlock_iothread();
579 trace_colo_vm_state_change("stop", "run");
580
479125d5
HZ
581 timer_mod(s->colo_delay_timer,
582 current_time + s->parameters.x_checkpoint_delay);
583
4f97558e 584 while (s->state == MIGRATION_STATUS_COLO) {
b3f7f0c5
HZ
585 if (failover_get_state() != FAILOVER_STATUS_NONE) {
586 error_report("failover request");
587 goto out;
588 }
589
bb70b66e 590 qemu_event_wait(&s->colo_checkpoint_event);
18cc23d7 591
2518aec1
HZ
592 if (s->state != MIGRATION_STATUS_COLO) {
593 goto out;
594 }
a91246c9 595 ret = colo_do_checkpoint_transaction(s, bioc, fb);
4f97558e
HZ
596 if (ret < 0) {
597 goto out;
598 }
599 }
0b827d5e 600
56ba83d2 601out:
4f97558e
HZ
602 /* Throw the unreported error message after exited from loop */
603 if (local_err) {
604 error_report_err(local_err);
605 }
606
a91246c9
HZ
607 if (fb) {
608 qemu_fclose(fb);
609 }
610
9ecff6d6
HZ
611 /*
612 * There are only two reasons we can get here, some error happened
613 * or the user triggered failover.
614 */
615 switch (failover_get_state()) {
1fe6ab26 616 case FAILOVER_STATUS_COMPLETED:
9ecff6d6
HZ
617 qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
618 COLO_EXIT_REASON_REQUEST);
619 break;
620 default:
3a43ac47
ZC
621 qapi_event_send_colo_exit(COLO_MODE_PRIMARY,
622 COLO_EXIT_REASON_ERROR);
9ecff6d6
HZ
623 }
624
c937b9a6
HZ
625 /* Hope this not to be too long to wait here */
626 qemu_sem_wait(&s->colo_exit_sem);
627 qemu_sem_destroy(&s->colo_exit_sem);
131b2153
ZC
628
629 /*
630 * It is safe to unregister notifier after failover finished.
631 * Besides, colo_delay_timer and colo_checkpoint_sem can't be
3a4452d8 632 * released before unregister notifier, or there will be use-after-free
131b2153
ZC
633 * error.
634 */
635 colo_compare_unregister_notifier(&packets_compare_notifier);
131b2153 636 timer_free(s->colo_delay_timer);
bb70b66e 637 qemu_event_destroy(&s->colo_checkpoint_event);
131b2153 638
c937b9a6
HZ
639 /*
640 * Must be called after failover BH is completed,
641 * Or the failover BH may shutdown the wrong fd that
642 * re-used by other threads after we release here.
643 */
56ba83d2
HZ
644 if (s->rp_state.from_dst_file) {
645 qemu_fclose(s->rp_state.from_dst_file);
ac183dac 646 s->rp_state.from_dst_file = NULL;
56ba83d2 647 }
0b827d5e
HZ
648}
649
479125d5
HZ
650void colo_checkpoint_notify(void *opaque)
651{
652 MigrationState *s = opaque;
653 int64_t next_notify_time;
654
bb70b66e 655 qemu_event_set(&s->colo_checkpoint_event);
479125d5
HZ
656 s->colo_checkpoint_time = qemu_clock_get_ms(QEMU_CLOCK_HOST);
657 next_notify_time = s->colo_checkpoint_time +
658 s->parameters.x_checkpoint_delay;
659 timer_mod(s->colo_delay_timer, next_notify_time);
660}
661
0b827d5e
HZ
662void migrate_start_colo_process(MigrationState *s)
663{
664 qemu_mutex_unlock_iothread();
bb70b66e 665 qemu_event_init(&s->colo_checkpoint_event, false);
479125d5
HZ
666 s->colo_delay_timer = timer_new_ms(QEMU_CLOCK_HOST,
667 colo_checkpoint_notify, s);
668
c937b9a6 669 qemu_sem_init(&s->colo_exit_sem, 0);
0b827d5e
HZ
670 migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE,
671 MIGRATION_STATUS_COLO);
672 colo_process_checkpoint(s);
673 qemu_mutex_lock_iothread();
674}
25d0c16f 675
6ad8ad38
HZ
676static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
677 QEMUFile *fb, QIOChannelBuffer *bioc, Error **errp)
678{
679 uint64_t total_size;
680 uint64_t value;
681 Error *local_err = NULL;
682 int ret;
683
684 qemu_mutex_lock_iothread();
685 vm_stop_force_state(RUN_STATE_COLO);
686 trace_colo_vm_state_change("run", "stop");
687 qemu_mutex_unlock_iothread();
688
689 /* FIXME: This is unnecessary for periodic checkpoint mode */
690 colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_REPLY,
691 &local_err);
692 if (local_err) {
693 error_propagate(errp, local_err);
694 return;
695 }
696
697 colo_receive_check_message(mis->from_src_file,
698 COLO_MESSAGE_VMSTATE_SEND, &local_err);
699 if (local_err) {
700 error_propagate(errp, local_err);
701 return;
702 }
703
704 qemu_mutex_lock_iothread();
786d8b8e 705 cpu_synchronize_all_states();
6ad8ad38
HZ
706 ret = qemu_loadvm_state_main(mis->from_src_file, mis);
707 qemu_mutex_unlock_iothread();
708
709 if (ret < 0) {
710 error_setg(errp, "Load VM's live state (ram) error");
711 return;
712 }
713
714 value = colo_receive_message_value(mis->from_src_file,
715 COLO_MESSAGE_VMSTATE_SIZE, &local_err);
716 if (local_err) {
717 error_propagate(errp, local_err);
718 return;
719 }
720
721 /*
722 * Read VM device state data into channel buffer,
723 * It's better to re-use the memory allocated.
724 * Here we need to handle the channel buffer directly.
725 */
726 if (value > bioc->capacity) {
727 bioc->capacity = value;
728 bioc->data = g_realloc(bioc->data, bioc->capacity);
729 }
730 total_size = qemu_get_buffer(mis->from_src_file, bioc->data, value);
731 if (total_size != value) {
732 error_setg(errp, "Got %" PRIu64 " VMState data, less than expected"
733 " %" PRIu64, total_size, value);
734 return;
735 }
736 bioc->usage = total_size;
737 qio_channel_io_seek(QIO_CHANNEL(bioc), 0, 0, NULL);
738
739 colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_RECEIVED,
740 &local_err);
741 if (local_err) {
742 error_propagate(errp, local_err);
743 return;
744 }
745
746 qemu_mutex_lock_iothread();
747 vmstate_loading = true;
24fa16f8 748 colo_flush_ram_cache();
6ad8ad38
HZ
749 ret = qemu_load_device_state(fb);
750 if (ret < 0) {
751 error_setg(errp, "COLO: load device state failed");
92c932de 752 vmstate_loading = false;
6ad8ad38
HZ
753 qemu_mutex_unlock_iothread();
754 return;
755 }
756
757#ifdef CONFIG_REPLICATION
758 replication_get_error_all(&local_err);
759 if (local_err) {
760 error_propagate(errp, local_err);
92c932de 761 vmstate_loading = false;
6ad8ad38
HZ
762 qemu_mutex_unlock_iothread();
763 return;
764 }
765
766 /* discard colo disk buffer */
767 replication_do_checkpoint_all(&local_err);
768 if (local_err) {
769 error_propagate(errp, local_err);
92c932de 770 vmstate_loading = false;
6ad8ad38
HZ
771 qemu_mutex_unlock_iothread();
772 return;
773 }
774#else
775 abort();
776#endif
777 /* Notify all filters of all NIC to do checkpoint */
778 colo_notify_filters_event(COLO_EVENT_CHECKPOINT, &local_err);
779
780 if (local_err) {
781 error_propagate(errp, local_err);
92c932de 782 vmstate_loading = false;
6ad8ad38
HZ
783 qemu_mutex_unlock_iothread();
784 return;
785 }
786
787 vmstate_loading = false;
788 vm_start();
789 trace_colo_vm_state_change("stop", "run");
790 qemu_mutex_unlock_iothread();
791
792 if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
6ad8ad38
HZ
793 return;
794 }
795
796 colo_send_message(mis->to_src_file, COLO_MESSAGE_VMSTATE_LOADED,
797 &local_err);
2155ceaf 798 error_propagate(errp, local_err);
6ad8ad38
HZ
799}
800
801static void colo_wait_handle_message(MigrationIncomingState *mis,
802 QEMUFile *fb, QIOChannelBuffer *bioc, Error **errp)
4f97558e
HZ
803{
804 COLOMessage msg;
805 Error *local_err = NULL;
806
6ad8ad38 807 msg = colo_receive_message(mis->from_src_file, &local_err);
4f97558e
HZ
808 if (local_err) {
809 error_propagate(errp, local_err);
810 return;
811 }
812
813 switch (msg) {
814 case COLO_MESSAGE_CHECKPOINT_REQUEST:
6ad8ad38 815 colo_incoming_process_checkpoint(mis, fb, bioc, errp);
4f97558e
HZ
816 break;
817 default:
4f97558e
HZ
818 error_setg(errp, "Got unknown COLO message: %d", msg);
819 break;
820 }
821}
822
25d0c16f
HZ
823void *colo_process_incoming_thread(void *opaque)
824{
825 MigrationIncomingState *mis = opaque;
4291d372
HZ
826 QEMUFile *fb = NULL;
827 QIOChannelBuffer *bioc = NULL; /* Cache incoming device state */
4f97558e 828 Error *local_err = NULL;
25d0c16f 829
74637e6f 830 rcu_register_thread();
c937b9a6
HZ
831 qemu_sem_init(&mis->colo_incoming_sem, 0);
832
25d0c16f
HZ
833 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
834 MIGRATION_STATUS_COLO);
835
2b9f6bf3 836 if (get_colo_mode() != COLO_MODE_SECONDARY) {
5ed0deca
ZC
837 error_report("COLO mode must be COLO_MODE_SECONDARY");
838 return NULL;
839 }
840
aef06085
HZ
841 failover_init_state();
842
56ba83d2
HZ
843 mis->to_src_file = qemu_file_get_return_path(mis->from_src_file);
844 if (!mis->to_src_file) {
845 error_report("COLO incoming thread: Open QEMUFile to_src_file failed");
846 goto out;
847 }
848 /*
849 * Note: the communication between Primary side and Secondary side
850 * should be sequential, we set the fd to unblocked in migration incoming
851 * coroutine, and here we are in the COLO incoming thread, so it is ok to
852 * set the fd back to blocked.
853 */
854 qemu_file_set_blocking(mis->from_src_file, true);
855
0393031a
HZ
856 colo_incoming_start_dirty_log();
857
4291d372
HZ
858 bioc = qio_channel_buffer_new(COLO_BUFFER_BASE_SIZE);
859 fb = qemu_fopen_channel_input(QIO_CHANNEL(bioc));
860 object_unref(OBJECT(bioc));
861
131b2153 862 qemu_mutex_lock_iothread();
3ebb9c4f 863#ifdef CONFIG_REPLICATION
8e48ac95
ZC
864 replication_start_all(REPLICATION_MODE_SECONDARY, &local_err);
865 if (local_err) {
866 qemu_mutex_unlock_iothread();
867 goto out;
868 }
3ebb9c4f
ZC
869#else
870 abort();
871#endif
131b2153
ZC
872 vm_start();
873 trace_colo_vm_state_change("stop", "run");
874 qemu_mutex_unlock_iothread();
875
4f97558e
HZ
876 colo_send_message(mis->to_src_file, COLO_MESSAGE_CHECKPOINT_READY,
877 &local_err);
878 if (local_err) {
879 goto out;
880 }
881
882 while (mis->state == MIGRATION_STATUS_COLO) {
6ad8ad38 883 colo_wait_handle_message(mis, fb, bioc, &local_err);
4f97558e 884 if (local_err) {
6ad8ad38
HZ
885 error_report_err(local_err);
886 break;
4f97558e 887 }
92c932de
LS
888
889 if (failover_get_state() == FAILOVER_STATUS_RELAUNCH) {
890 failover_set_state(FAILOVER_STATUS_RELAUNCH,
891 FAILOVER_STATUS_NONE);
892 failover_request_active(NULL);
893 break;
894 }
895
9d2db376
HZ
896 if (failover_get_state() != FAILOVER_STATUS_NONE) {
897 error_report("failover request");
6ad8ad38 898 break;
4f97558e
HZ
899 }
900 }
25d0c16f 901
56ba83d2 902out:
3a43ac47
ZC
903 /*
904 * There are only two reasons we can get here, some error happened
905 * or the user triggered failover.
906 */
9ecff6d6 907 switch (failover_get_state()) {
1fe6ab26 908 case FAILOVER_STATUS_COMPLETED:
9ecff6d6
HZ
909 qapi_event_send_colo_exit(COLO_MODE_SECONDARY,
910 COLO_EXIT_REASON_REQUEST);
911 break;
912 default:
3a43ac47
ZC
913 qapi_event_send_colo_exit(COLO_MODE_SECONDARY,
914 COLO_EXIT_REASON_ERROR);
9ecff6d6
HZ
915 }
916
4291d372
HZ
917 if (fb) {
918 qemu_fclose(fb);
919 }
920
c937b9a6
HZ
921 /* Hope this not to be too long to loop here */
922 qemu_sem_wait(&mis->colo_incoming_sem);
923 qemu_sem_destroy(&mis->colo_incoming_sem);
25d0c16f 924
74637e6f 925 rcu_unregister_thread();
25d0c16f
HZ
926 return NULL;
927}