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migration: introduce downtime_start
[mirror_qemu.git] / migration / migration.c
CommitLineData
5bb7910a
AL		 1/*
2 * QEMU live migration
3 *
4 * Copyright IBM, Corp. 2008
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
6b620ca3
PB		 12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
5bb7910a
AL		 14 */
15
1393a485 16#include "qemu/osdep.h"
f348b6d1 17#include "qemu/cutils.h"
d49b6836 18#include "qemu/error-report.h"
795c40b8 19#include "migration/blocker.h"
f4dbe1bf 20#include "exec.h"
7fcac4a2 21#include "fd.h"
61e8b148 22#include "socket.h"
e1a3ecee 23#include "rdma.h"
7b1e1a22 24#include "ram.h"
84a899de 25#include "migration/global_state.h"
c4b63b7c 26#include "migration/misc.h"
6666c96a 27#include "migration.h"
20a519a0 28#include "savevm.h"
40014d81 29#include "qemu-file-channel.h"
08a0aee1 30#include "qemu-file.h"
987772d9 31#include "migration/vmstate.h"
737e150e 32#include "block/block.h"
cc7a8ea7 33#include "qapi/qmp/qerror.h"
ab28bd23 34#include "qemu/rcu.h"
2c9e6fec 35#include "block.h"
be07b0ac 36#include "postcopy-ram.h"
766bd176 37#include "qemu/thread.h"
791e7c82 38#include "qmp-commands.h"
c09e5bb1 39#include "trace.h"
598cd2bd 40#include "qapi-event.h"
51180423 41#include "exec/target_page.h"
61b67d47 42#include "io/channel-buffer.h"
35a6ed4f 43#include "migration/colo.h"
4ffdb337 44#include "hw/boards.h"
9d18af93 45#include "monitor/monitor.h"
065e2813 46
dc325627 47#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */
5bb7910a 48
5b4e1eb7
JQ		 49/* Amount of time to allocate to each "chunk" of bandwidth-throttled
50 * data. */
51#define BUFFER_DELAY 100
52#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
53
2ff30257
AA		 54/* Time in milliseconds we are allowed to stop the source,
55 * for sending the last part */
56#define DEFAULT_MIGRATE_SET_DOWNTIME 300
57
87c9cc1c
DHB		 58/* Maximum migrate downtime set to 2000 seconds */
59#define MAX_MIGRATE_DOWNTIME_SECONDS 2000
60#define MAX_MIGRATE_DOWNTIME (MAX_MIGRATE_DOWNTIME_SECONDS * 1000)
61
8706d2d5
LL		 62/* Default compression thread count */
63#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
3fcb38c2
LL		 64/* Default decompression thread count, usually decompression is at
65 * least 4 times as fast as compression.*/
66#define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
8706d2d5
LL		 67/*0: means nocompress, 1: best speed, ... 9: best compress ratio */
68#define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
1626fee3 69/* Define default autoconverge cpu throttle migration parameters */
d85a31d1
JH		 70#define DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL 20
71#define DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT 10
8706d2d5 72
17ad9b35 73/* Migration XBZRLE default cache size */
73af8dd8 74#define DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE (64 * 1024 * 1024)
17ad9b35 75
68b53591
HZ		 76/* The delay time (in ms) between two COLO checkpoints
77 * Note: Please change this default value to 10000 when we support hybrid mode.
78 */
79#define DEFAULT_MIGRATE_X_CHECKPOINT_DELAY 200
4075fb1c 80#define DEFAULT_MIGRATE_MULTIFD_CHANNELS 2
0fb86605 81#define DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT 16
68b53591 82
99a0db9b
GH		 83static NotifierList migration_state_notifiers =
84 NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
85
adde220a
DDAG		 86static bool deferred_incoming;
87
da6f1790
JQ		 88/* Messages sent on the return path from destination to source */
89enum mig_rp_message_type {
90 MIG_RP_MSG_INVALID = 0, /* Must be 0 */
91 MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */
92 MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */
93
94 MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */
95 MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */
96
97 MIG_RP_MSG_MAX
98};
99
17549e84
JQ		 100/* When we add fault tolerance, we could have several
101 migrations at once. For now we don't need to add
102 dynamic creation of migration */
103
e5cb7e76
PX		 104static MigrationState *current_migration;
105
8b0b29dc 106static bool migration_object_check(MigrationState *ms, Error **errp);
0331c8ca
DDAG		 107static int migration_maybe_pause(MigrationState *s,
108 int *current_active_state,
109 int new_state);
8b0b29dc 110
e5cb7e76
PX		 111void migration_object_init(void)
112{
4ffdb337 113 MachineState *ms = MACHINE(qdev_get_machine());
8b0b29dc 114 Error *err = NULL;
4ffdb337 115
e5cb7e76
PX		 116 /* This can only be called once. */
117 assert(!current_migration);
118 current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION));
4ffdb337 119
8b0b29dc
PX		 120 if (!migration_object_check(current_migration, &err)) {
121 error_report_err(err);
122 exit(1);
123 }
124
4ffdb337
PX		 125 /*
126 * We cannot really do this in migration_instance_init() since at
127 * that time global properties are not yet applied, then this
128 * value will be definitely replaced by something else.
129 */
130 if (ms->enforce_config_section) {
131 current_migration->send_configuration = true;
132 }
e5cb7e76
PX		 133}
134
1f895604
VSO		 135void migration_object_finalize(void)
136{
137 object_unref(OBJECT(current_migration));
138}
139
bca7856a 140/* For outgoing */
859bc756 141MigrationState *migrate_get_current(void)
17549e84 142{
e5cb7e76
PX		 143 /* This can only be called after the object created. */
144 assert(current_migration);
145 return current_migration;
17549e84
JQ		 146}
147
bca7856a
DDAG		 148MigrationIncomingState *migration_incoming_get_current(void)
149{
b4b076da
JQ		 150 static bool once;
151 static MigrationIncomingState mis_current;
bca7856a 152
b4b076da
JQ		 153 if (!once) {
154 mis_current.state = MIGRATION_STATUS_NONE;
155 memset(&mis_current, 0, sizeof(MigrationIncomingState));
b4b076da
JQ		 156 qemu_mutex_init(&mis_current.rp_mutex);
157 qemu_event_init(&mis_current.main_thread_load_event, false);
158 once = true;
159 }
160 return &mis_current;
bca7856a
DDAG		 161}
162
163void migration_incoming_state_destroy(void)
164{
b4b076da
JQ		 165 struct MigrationIncomingState *mis = migration_incoming_get_current();
166
3482655b 167 if (mis->to_src_file) {
660819b1
PX		 168 /* Tell source that we are done */
169 migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0);
3482655b
PX		 170 qemu_fclose(mis->to_src_file);
171 mis->to_src_file = NULL;
172 }
173
660819b1
PX		 174 if (mis->from_src_file) {
175 qemu_fclose(mis->from_src_file);
176 mis->from_src_file = NULL;
177 }
178
5089e186 179 qemu_event_reset(&mis->main_thread_load_event);
bca7856a
DDAG		 180}
181
b05dc723
JQ		 182static void migrate_generate_event(int new_state)
183{
184 if (migrate_use_events()) {
185 qapi_event_send_migration(new_state, &error_abort);
b05dc723
JQ		 186 }
187}
188
adde220a
DDAG		 189/*
190 * Called on -incoming with a defer: uri.
191 * The migration can be started later after any parameters have been
192 * changed.
193 */
194static void deferred_incoming_migration(Error **errp)
195{
196 if (deferred_incoming) {
197 error_setg(errp, "Incoming migration already deferred");
198 }
199 deferred_incoming = true;
200}
201
da6f1790
JQ		 202/*
203 * Send a message on the return channel back to the source
204 * of the migration.
205 */
206static void migrate_send_rp_message(MigrationIncomingState *mis,
207 enum mig_rp_message_type message_type,
208 uint16_t len, void *data)
209{
210 trace_migrate_send_rp_message((int)message_type, len);
211 qemu_mutex_lock(&mis->rp_mutex);
212 qemu_put_be16(mis->to_src_file, (unsigned int)message_type);
213 qemu_put_be16(mis->to_src_file, len);
214 qemu_put_buffer(mis->to_src_file, data, len);
215 qemu_fflush(mis->to_src_file);
216 qemu_mutex_unlock(&mis->rp_mutex);
217}
218
1e2d90eb
DDAG		 219/* Request a range of pages from the source VM at the given
220 * start address.
221 * rbname: Name of the RAMBlock to request the page in, if NULL it's the same
222 * as the last request (a name must have been given previously)
223 * Start: Address offset within the RB
224 * Len: Length in bytes required - must be a multiple of pagesize
225 */
226void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
227 ram_addr_t start, size_t len)
228{
cb8d4c8f 229 uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */
1e2d90eb
DDAG		 230 size_t msglen = 12; /* start + len */
231
232 *(uint64_t *)bufc = cpu_to_be64((uint64_t)start);
233 *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len);
234
235 if (rbname) {
236 int rbname_len = strlen(rbname);
237 assert(rbname_len < 256);
238
239 bufc[msglen++] = rbname_len;
240 memcpy(bufc + msglen, rbname, rbname_len);
241 msglen += rbname_len;
242 migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc);
243 } else {
244 migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc);
245 }
246}
247
43eaae28 248void qemu_start_incoming_migration(const char *uri, Error **errp)
5bb7910a 249{
34c9dd8e
AL		 250 const char *p;
251
7cf1fe6d 252 qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort);
adde220a
DDAG		 253 if (!strcmp(uri, "defer")) {
254 deferred_incoming_migration(errp);
255 } else if (strstart(uri, "tcp:", &p)) {
43eaae28 256 tcp_start_incoming_migration(p, errp);
2da776db 257#ifdef CONFIG_RDMA
adde220a 258 } else if (strstart(uri, "rdma:", &p)) {
2da776db
MH		 259 rdma_start_incoming_migration(p, errp);
260#endif
adde220a 261 } else if (strstart(uri, "exec:", &p)) {
43eaae28 262 exec_start_incoming_migration(p, errp);
adde220a 263 } else if (strstart(uri, "unix:", &p)) {
43eaae28 264 unix_start_incoming_migration(p, errp);
adde220a 265 } else if (strstart(uri, "fd:", &p)) {
43eaae28 266 fd_start_incoming_migration(p, errp);
adde220a 267 } else {
312fd5f2 268 error_setg(errp, "unknown migration protocol: %s", uri);
8ca5e801 269 }
5bb7910a
AL		 270}
271
0aa6aefc
DL		 272static void process_incoming_migration_bh(void *opaque)
273{
274 Error *local_err = NULL;
275 MigrationIncomingState *mis = opaque;
276
ace21a58
KW		 277 /* Make sure all file formats flush their mutable metadata.
278 * If we get an error here, just don't restart the VM yet. */
0aa6aefc 279 bdrv_invalidate_cache_all(&local_err);
d35ff5e6 280 if (local_err) {
ace21a58 281 error_report_err(local_err);
d35ff5e6
KW		 282 local_err = NULL;
283 autostart = false;
284 }
285
0aa6aefc
DL		 286 /*
287 * This must happen after all error conditions are dealt with and
288 * we're sure the VM is going to be running on this host.
289 */
290 qemu_announce_self();
291
f986c3d2
JQ		 292 if (multifd_load_cleanup(&local_err) != 0) {
293 error_report_err(local_err);
294 autostart = false;
295 }
0aa6aefc
DL		 296 /* If global state section was not received or we are in running
297 state, we need to obey autostart. Any other state is set with
298 runstate_set. */
299
300 if (!global_state_received() ||
301 global_state_get_runstate() == RUN_STATE_RUNNING) {
302 if (autostart) {
303 vm_start();
304 } else {
305 runstate_set(RUN_STATE_PAUSED);
306 }
307 } else {
308 runstate_set(global_state_get_runstate());
309 }
0aa6aefc
DL		 310 /*
311 * This must happen after any state changes since as soon as an external
312 * observer sees this event they might start to prod at the VM assuming
313 * it's ready to use.
314 */
315 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
316 MIGRATION_STATUS_COMPLETED);
317 qemu_bh_delete(mis->bh);
318 migration_incoming_state_destroy();
319}
320
82a4da79 321static void process_incoming_migration_co(void *opaque)
511c0231 322{
b4b076da 323 MigrationIncomingState *mis = migration_incoming_get_current();
e9bef235 324 PostcopyState ps;
1c12e1f5
PB		 325 int ret;
326
4f0fae7f 327 assert(mis->from_src_file);
67f11b5c 328 mis->largest_page_size = qemu_ram_pagesize_largest();
093e3c42 329 postcopy_state_set(POSTCOPY_INCOMING_NONE);
93d7af6f
HZ		 330 migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
331 MIGRATION_STATUS_ACTIVE);
4f0fae7f 332 ret = qemu_loadvm_state(mis->from_src_file);
bca7856a 333
e9bef235
DDAG		 334 ps = postcopy_state_get();
335 trace_process_incoming_migration_co_end(ret, ps);
336 if (ps != POSTCOPY_INCOMING_NONE) {
337 if (ps == POSTCOPY_INCOMING_ADVISE) {
338 /*
339 * Where a migration had postcopy enabled (and thus went to advise)
340 * but managed to complete within the precopy period, we can use
341 * the normal exit.
342 */
343 postcopy_ram_incoming_cleanup(mis);
344 } else if (ret >= 0) {
345 /*
346 * Postcopy was started, cleanup should happen at the end of the
347 * postcopy thread.
348 */
349 trace_process_incoming_migration_co_postcopy_end_main();
350 return;
351 }
352 /* Else if something went wrong then just fall out of the normal exit */
353 }
354
25d0c16f
HZ		 355 /* we get COLO info, and know if we are in COLO mode */
356 if (!ret && migration_incoming_enable_colo()) {
357 mis->migration_incoming_co = qemu_coroutine_self();
358 qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming",
359 colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE);
360 mis->have_colo_incoming_thread = true;
361 qemu_coroutine_yield();
362
363 /* Wait checkpoint incoming thread exit before free resource */
364 qemu_thread_join(&mis->colo_incoming_thread);
365 }
366
1c12e1f5 367 if (ret < 0) {
f986c3d2
JQ		 368 Error *local_err = NULL;
369
93d7af6f
HZ		 370 migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
371 MIGRATION_STATUS_FAILED);
db80face 372 error_report("load of migration failed: %s", strerror(-ret));
3a0f2cea 373 qemu_fclose(mis->from_src_file);
f986c3d2
JQ		 374 if (multifd_load_cleanup(&local_err) != 0) {
375 error_report_err(local_err);
376 }
4aead692 377 exit(EXIT_FAILURE);
511c0231 378 }
0aa6aefc
DL		 379 mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
380 qemu_bh_schedule(mis->bh);
511c0231
JQ		 381}
382
e595a01a 383static void migration_incoming_setup(QEMUFile *f)
82a4da79 384{
4f0fae7f 385 MigrationIncomingState *mis = migration_incoming_get_current();
82a4da79 386
f986c3d2
JQ		 387 if (multifd_load_setup() != 0) {
388 /* We haven't been able to create multifd threads
389 nothing better to do */
390 exit(EXIT_FAILURE);
391 }
392
4f0fae7f
JQ		 393 if (!mis->from_src_file) {
394 mis->from_src_file = f;
395 }
06ad5135 396 qemu_file_set_blocking(f, false);
e595a01a
JQ		 397}
398
399static void migration_incoming_process(void)
400{
401 Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL);
0b8b8753 402 qemu_coroutine_enter(co);
82a4da79
PB		 403}
404
e595a01a
JQ		 405void migration_fd_process_incoming(QEMUFile *f)
406{
407 migration_incoming_setup(f);
408 migration_incoming_process();
409}
410
4f0fae7f
JQ		 411void migration_ioc_process_incoming(QIOChannel *ioc)
412{
413 MigrationIncomingState *mis = migration_incoming_get_current();
414
415 if (!mis->from_src_file) {
416 QEMUFile *f = qemu_fopen_channel_input(ioc);
417 migration_fd_process_incoming(f);
418 }
419 /* We still only have a single channel. Nothing to do here yet */
420}
421
428d8908
JQ		 422/**
423 * @migration_has_all_channels: We have received all channels that we need
424 *
425 * Returns true when we have got connections to all the channels that
426 * we need for migration.
427 */
428bool migration_has_all_channels(void)
429{
430 return true;
431}
432
6decec93
DDAG		 433/*
434 * Send a 'SHUT' message on the return channel with the given value
435 * to indicate that we've finished with the RP. Non-0 value indicates
436 * error.
437 */
438void migrate_send_rp_shut(MigrationIncomingState *mis,
439 uint32_t value)
440{
441 uint32_t buf;
442
443 buf = cpu_to_be32(value);
444 migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf);
445}
446
447/*
448 * Send a 'PONG' message on the return channel with the given value
449 * (normally in response to a 'PING')
450 */
451void migrate_send_rp_pong(MigrationIncomingState *mis,
452 uint32_t value)
453{
454 uint32_t buf;
455
456 buf = cpu_to_be32(value);
457 migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf);
458}
459
bbf6da32
OW		 460MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
461{
462 MigrationCapabilityStatusList *head = NULL;
463 MigrationCapabilityStatusList *caps;
464 MigrationState *s = migrate_get_current();
465 int i;
466
387eedeb 467 caps = NULL; /* silence compiler warning */
7fb1cf16 468 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
ed1701c6
DDAG		 469#ifndef CONFIG_LIVE_BLOCK_MIGRATION
470 if (i == MIGRATION_CAPABILITY_BLOCK) {
471 continue;
472 }
473#endif
bbf6da32
OW		 474 if (head == NULL) {
475 head = g_malloc0(sizeof(*caps));
476 caps = head;
477 } else {
478 caps->next = g_malloc0(sizeof(*caps));
479 caps = caps->next;
480 }
481 caps->value =
482 g_malloc(sizeof(*caps->value));
483 caps->value->capability = i;
484 caps->value->state = s->enabled_capabilities[i];
485 }
486
487 return head;
488}
489
85de8323
LL		 490MigrationParameters *qmp_query_migrate_parameters(Error **errp)
491{
492 MigrationParameters *params;
493 MigrationState *s = migrate_get_current();
494
e87fae4c 495 /* TODO use QAPI_CLONE() instead of duplicating it inline */
85de8323 496 params = g_malloc0(sizeof(*params));
de63ab61 497 params->has_compress_level = true;
2594f56d 498 params->compress_level = s->parameters.compress_level;
de63ab61 499 params->has_compress_threads = true;
2594f56d 500 params->compress_threads = s->parameters.compress_threads;
de63ab61 501 params->has_decompress_threads = true;
2594f56d 502 params->decompress_threads = s->parameters.decompress_threads;
de63ab61 503 params->has_cpu_throttle_initial = true;
2594f56d 504 params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
de63ab61 505 params->has_cpu_throttle_increment = true;
2594f56d 506 params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
8cc99dcd 507 params->has_tls_creds = true;
69ef1f36 508 params->tls_creds = g_strdup(s->parameters.tls_creds);
8cc99dcd 509 params->has_tls_hostname = true;
69ef1f36 510 params->tls_hostname = g_strdup(s->parameters.tls_hostname);
2ff30257
AA		 511 params->has_max_bandwidth = true;
512 params->max_bandwidth = s->parameters.max_bandwidth;
513 params->has_downtime_limit = true;
514 params->downtime_limit = s->parameters.downtime_limit;
fe39a4d4 515 params->has_x_checkpoint_delay = true;
68b53591 516 params->x_checkpoint_delay = s->parameters.x_checkpoint_delay;
2833c59b
JQ		 517 params->has_block_incremental = true;
518 params->block_incremental = s->parameters.block_incremental;
4075fb1c
JQ		 519 params->has_x_multifd_channels = true;
520 params->x_multifd_channels = s->parameters.x_multifd_channels;
0fb86605
JQ		 521 params->has_x_multifd_page_count = true;
522 params->x_multifd_page_count = s->parameters.x_multifd_page_count;
73af8dd8
JQ		 523 params->has_xbzrle_cache_size = true;
524 params->xbzrle_cache_size = s->parameters.xbzrle_cache_size;
85de8323
LL		 525
526 return params;
527}
528
f6844b99
DDAG		 529/*
530 * Return true if we're already in the middle of a migration
531 * (i.e. any of the active or setup states)
532 */
533static bool migration_is_setup_or_active(int state)
534{
535 switch (state) {
536 case MIGRATION_STATUS_ACTIVE:
9ec055ae 537 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
f6844b99 538 case MIGRATION_STATUS_SETUP:
31e06077
DDAG		 539 case MIGRATION_STATUS_PRE_SWITCHOVER:
540 case MIGRATION_STATUS_DEVICE:
f6844b99
DDAG		 541 return true;
542
543 default:
544 return false;
545
546 }
547}
548
a22463a5
DDAG		 549static void populate_ram_info(MigrationInfo *info, MigrationState *s)
550{
551 info->has_ram = true;
552 info->ram = g_malloc0(sizeof(*info->ram));
9360447d 553 info->ram->transferred = ram_counters.transferred;
a22463a5 554 info->ram->total = ram_bytes_total();
9360447d 555 info->ram->duplicate = ram_counters.duplicate;
bedf53c1
JQ		 556 /* legacy value. It is not used anymore */
557 info->ram->skipped = 0;
9360447d
JQ		 558 info->ram->normal = ram_counters.normal;
559 info->ram->normal_bytes = ram_counters.normal *
20afaed9 560 qemu_target_page_size();
a22463a5 561 info->ram->mbps = s->mbps;
9360447d
JQ		 562 info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
563 info->ram->postcopy_requests = ram_counters.postcopy_requests;
030ce1f8 564 info->ram->page_size = qemu_target_page_size();
a22463a5 565
114f5aee
JQ		 566 if (migrate_use_xbzrle()) {
567 info->has_xbzrle_cache = true;
568 info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
569 info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
9360447d
JQ		 570 info->xbzrle_cache->bytes = xbzrle_counters.bytes;
571 info->xbzrle_cache->pages = xbzrle_counters.pages;
572 info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss;
573 info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate;
574 info->xbzrle_cache->overflow = xbzrle_counters.overflow;
114f5aee
JQ		 575 }
576
338182c8
JQ		 577 if (cpu_throttle_active()) {
578 info->has_cpu_throttle_percentage = true;
579 info->cpu_throttle_percentage = cpu_throttle_get_percentage();
580 }
581
a22463a5
DDAG		 582 if (s->state != MIGRATION_STATUS_COMPLETED) {
583 info->ram->remaining = ram_bytes_remaining();
9360447d 584 info->ram->dirty_pages_rate = ram_counters.dirty_pages_rate;
a22463a5
DDAG		 585 }
586}
587
930ac04c
JQ		 588static void populate_disk_info(MigrationInfo *info)
589{
590 if (blk_mig_active()) {
591 info->has_disk = true;
592 info->disk = g_malloc0(sizeof(*info->disk));
593 info->disk->transferred = blk_mig_bytes_transferred();
594 info->disk->remaining = blk_mig_bytes_remaining();
595 info->disk->total = blk_mig_bytes_total();
596 }
597}
598
ca6011c2 599static void fill_source_migration_info(MigrationInfo *info)
5bb7910a 600{
17549e84
JQ		 601 MigrationState *s = migrate_get_current();
602
603 switch (s->state) {
31194731 604 case MIGRATION_STATUS_NONE:
17549e84 605 /* no migration has happened ever */
ca6011c2
AP		 606 /* do not overwrite destination migration status */
607 return;
17549e84 608 break;
31194731 609 case MIGRATION_STATUS_SETUP:
29ae8a41 610 info->has_status = true;
ed4fbd10 611 info->has_total_time = false;
29ae8a41 612 break;
31194731
HZ		 613 case MIGRATION_STATUS_ACTIVE:
614 case MIGRATION_STATUS_CANCELLING:
9ec055ae 615 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
31e06077
DDAG		 616 case MIGRATION_STATUS_PRE_SWITCHOVER:
617 case MIGRATION_STATUS_DEVICE:
c8f9f4f4 618 /* TODO add some postcopy stats */
9ec055ae
DDAG		 619 info->has_status = true;
620 info->has_total_time = true;
621 info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
4af246a3 622 - s->start_time;
9ec055ae
DDAG		 623 info->has_expected_downtime = true;
624 info->expected_downtime = s->expected_downtime;
625 info->has_setup_time = true;
626 info->setup_time = s->setup_time;
627
a22463a5 628 populate_ram_info(info, s);
930ac04c 629 populate_disk_info(info);
17549e84 630 break;
0b827d5e
HZ		 631 case MIGRATION_STATUS_COLO:
632 info->has_status = true;
633 /* TODO: display COLO specific information (checkpoint info etc.) */
634 break;
31194731 635 case MIGRATION_STATUS_COMPLETED:
791e7c82 636 info->has_status = true;
00c14997 637 info->has_total_time = true;
7aa939af 638 info->total_time = s->total_time;
9c5a9fcf
JQ		 639 info->has_downtime = true;
640 info->downtime = s->downtime;
ed4fbd10
MH		 641 info->has_setup_time = true;
642 info->setup_time = s->setup_time;
d5f8a570 643
a22463a5 644 populate_ram_info(info, s);
17549e84 645 break;
31194731 646 case MIGRATION_STATUS_FAILED:
791e7c82 647 info->has_status = true;
d59ce6f3
DB		 648 if (s->error) {
649 info->has_error_desc = true;
650 info->error_desc = g_strdup(error_get_pretty(s->error));
651 }
17549e84 652 break;
31194731 653 case MIGRATION_STATUS_CANCELLED:
791e7c82 654 info->has_status = true;
17549e84 655 break;
5bb7910a 656 }
cde63fbe 657 info->status = s->state;
5bb7910a
AL		 658}
659
4a84214e
PX		 660/**
661 * @migration_caps_check - check capability validity
662 *
663 * @cap_list: old capability list, array of bool
664 * @params: new capabilities to be applied soon
665 * @errp: set *errp if the check failed, with reason
666 *
667 * Returns true if check passed, otherwise false.
668 */
669static bool migrate_caps_check(bool *cap_list,
670 MigrationCapabilityStatusList *params,
671 Error **errp)
00458433 672{
00458433 673 MigrationCapabilityStatusList *cap;
4a84214e 674 bool old_postcopy_cap;
d7651f15 675 MigrationIncomingState *mis = migration_incoming_get_current();
00458433 676
4a84214e 677 old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM];
00458433
OW		 678
679 for (cap = params; cap; cap = cap->next) {
4a84214e
PX		 680 cap_list[cap->value->capability] = cap->value->state;
681 }
682
ed1701c6 683#ifndef CONFIG_LIVE_BLOCK_MIGRATION
4a84214e
PX		 684 if (cap_list[MIGRATION_CAPABILITY_BLOCK]) {
685 error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
686 "block migration");
687 error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
688 return false;
00458433 689 }
4a84214e 690#endif
53dd370c 691
4a84214e
PX		 692 if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
693 if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
53dd370c
DDAG		 694 /* The decompression threads asynchronously write into RAM
695 * rather than use the atomic copies needed to avoid
696 * userfaulting. It should be possible to fix the decompression
697 * threads for compatibility in future.
698 */
4a84214e
PX		 699 error_setg(errp, "Postcopy is not currently compatible "
700 "with compression");
701 return false;
53dd370c 702 }
4a84214e 703
096631bd
DDAG		 704 /* This check is reasonably expensive, so only when it's being
705 * set the first time, also it's only the destination that needs
706 * special support.
707 */
708 if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) &&
d7651f15 709 !postcopy_ram_supported_by_host(mis)) {
096631bd
DDAG		 710 /* postcopy_ram_supported_by_host will have emitted a more
711 * detailed message
712 */
4a84214e
PX		 713 error_setg(errp, "Postcopy is not supported");
714 return false;
096631bd 715 }
53dd370c 716 }
4a84214e
PX		 717
718 return true;
719}
720
ca6011c2
AP		 721static void fill_destination_migration_info(MigrationInfo *info)
722{
723 MigrationIncomingState *mis = migration_incoming_get_current();
724
725 switch (mis->state) {
726 case MIGRATION_STATUS_NONE:
727 return;
728 break;
729 case MIGRATION_STATUS_SETUP:
730 case MIGRATION_STATUS_CANCELLING:
731 case MIGRATION_STATUS_CANCELLED:
732 case MIGRATION_STATUS_ACTIVE:
733 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
734 case MIGRATION_STATUS_FAILED:
735 case MIGRATION_STATUS_COLO:
736 info->has_status = true;
737 break;
738 case MIGRATION_STATUS_COMPLETED:
739 info->has_status = true;
740 fill_destination_postcopy_migration_info(info);
741 break;
742 }
743 info->status = mis->state;
744}
745
746MigrationInfo *qmp_query_migrate(Error **errp)
747{
748 MigrationInfo *info = g_malloc0(sizeof(*info));
749
750 fill_destination_migration_info(info);
751 fill_source_migration_info(info);
752
753 return info;
754}
755
4a84214e
PX		 756void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
757 Error **errp)
758{
759 MigrationState *s = migrate_get_current();
760 MigrationCapabilityStatusList *cap;
761
762 if (migration_is_setup_or_active(s->state)) {
763 error_setg(errp, QERR_MIGRATION_ACTIVE);
764 return;
765 }
766
767 if (!migrate_caps_check(s->enabled_capabilities, params, errp)) {
768 return;
769 }
770
771 for (cap = params; cap; cap = cap->next) {
772 s->enabled_capabilities[cap->value->capability] = cap->value->state;
773 }
00458433
OW		 774}
775
16d063bc
PX		 776/*
777 * Check whether the parameters are valid. Error will be put into errp
778 * (if provided). Return true if valid, otherwise false.
779 */
780static bool migrate_params_check(MigrationParameters *params, Error **errp)
85de8323 781{
7f375e04 782 if (params->has_compress_level &&
741d4086 783 (params->compress_level > 9)) {
c6bd8c70
MA		 784 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
785 "is invalid, it should be in the range of 0 to 9");
16d063bc 786 return false;
85de8323 787 }
16d063bc 788
741d4086 789 if (params->has_compress_threads && (params->compress_threads < 1)) {
c6bd8c70
MA		 790 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
791 "compress_threads",
792 "is invalid, it should be in the range of 1 to 255");
16d063bc 793 return false;
85de8323 794 }
16d063bc 795
741d4086 796 if (params->has_decompress_threads && (params->decompress_threads < 1)) {
c6bd8c70
MA		 797 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
798 "decompress_threads",
799 "is invalid, it should be in the range of 1 to 255");
16d063bc 800 return false;
85de8323 801 }
16d063bc 802
7f375e04
EB		 803 if (params->has_cpu_throttle_initial &&
804 (params->cpu_throttle_initial < 1 ||
805 params->cpu_throttle_initial > 99)) {
1626fee3 806 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
d85a31d1 807 "cpu_throttle_initial",
1626fee3 808 "an integer in the range of 1 to 99");
16d063bc 809 return false;
1626fee3 810 }
16d063bc 811
7f375e04
EB		 812 if (params->has_cpu_throttle_increment &&
813 (params->cpu_throttle_increment < 1 ||
814 params->cpu_throttle_increment > 99)) {
1626fee3 815 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
d85a31d1 816 "cpu_throttle_increment",
1626fee3 817 "an integer in the range of 1 to 99");
16d063bc 818 return false;
1626fee3 819 }
16d063bc 820
741d4086 821 if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
2ff30257
AA		 822 error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the"
823 " range of 0 to %zu bytes/second", SIZE_MAX);
16d063bc 824 return false;
2ff30257 825 }
16d063bc 826
2ff30257 827 if (params->has_downtime_limit &&
741d4086 828 (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
87c9cc1c
DHB		 829 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
830 "the range of 0 to %d milliseconds",
831 MAX_MIGRATE_DOWNTIME);
16d063bc 832 return false;
2ff30257 833 }
16d063bc 834
741d4086
JQ		 835 /* x_checkpoint_delay is now always positive */
836
837 if (params->has_x_multifd_channels && (params->x_multifd_channels < 1)) {
4075fb1c
JQ		 838 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
839 "multifd_channels",
840 "is invalid, it should be in the range of 1 to 255");
841 return false;
842 }
0fb86605 843 if (params->has_x_multifd_page_count &&
741d4086
JQ		 844 (params->x_multifd_page_count < 1 ||
845 params->x_multifd_page_count > 10000)) {
0fb86605
JQ		 846 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
847 "multifd_page_count",
848 "is invalid, it should be in the range of 1 to 10000");
849 return false;
850 }
16d063bc 851
73af8dd8
JQ		 852 if (params->has_xbzrle_cache_size &&
853 (params->xbzrle_cache_size < qemu_target_page_size() ||
854 !is_power_of_2(params->xbzrle_cache_size))) {
855 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
856 "xbzrle_cache_size",
857 "is invalid, it should be bigger than target page size"
858 " and a power of two");
859 return false;
860 }
861
16d063bc
PX		 862 return true;
863}
864
1bda8b3c
MA		 865static void migrate_params_test_apply(MigrateSetParameters *params,
866 MigrationParameters *dest)
867{
868 *dest = migrate_get_current()->parameters;
869
870 /* TODO use QAPI_CLONE() instead of duplicating it inline */
871
872 if (params->has_compress_level) {
873 dest->compress_level = params->compress_level;
874 }
875
876 if (params->has_compress_threads) {
877 dest->compress_threads = params->compress_threads;
878 }
879
880 if (params->has_decompress_threads) {
881 dest->decompress_threads = params->decompress_threads;
882 }
883
884 if (params->has_cpu_throttle_initial) {
885 dest->cpu_throttle_initial = params->cpu_throttle_initial;
886 }
887
888 if (params->has_cpu_throttle_increment) {
889 dest->cpu_throttle_increment = params->cpu_throttle_increment;
890 }
891
892 if (params->has_tls_creds) {
01fa5598
MA		 893 assert(params->tls_creds->type == QTYPE_QSTRING);
894 dest->tls_creds = g_strdup(params->tls_creds->u.s);
1bda8b3c
MA		 895 }
896
897 if (params->has_tls_hostname) {
01fa5598
MA		 898 assert(params->tls_hostname->type == QTYPE_QSTRING);
899 dest->tls_hostname = g_strdup(params->tls_hostname->u.s);
1bda8b3c
MA		 900 }
901
902 if (params->has_max_bandwidth) {
903 dest->max_bandwidth = params->max_bandwidth;
904 }
905
906 if (params->has_downtime_limit) {
907 dest->downtime_limit = params->downtime_limit;
908 }
909
910 if (params->has_x_checkpoint_delay) {
911 dest->x_checkpoint_delay = params->x_checkpoint_delay;
912 }
913
914 if (params->has_block_incremental) {
915 dest->block_incremental = params->block_incremental;
916 }
5e7577a1
JQ		 917 if (params->has_x_multifd_channels) {
918 dest->x_multifd_channels = params->x_multifd_channels;
919 }
920 if (params->has_x_multifd_page_count) {
921 dest->x_multifd_page_count = params->x_multifd_page_count;
922 }
73af8dd8
JQ		 923 if (params->has_xbzrle_cache_size) {
924 dest->xbzrle_cache_size = params->xbzrle_cache_size;
925 }
1bda8b3c
MA		 926}
927
73af8dd8 928static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
16d063bc
PX		 929{
930 MigrationState *s = migrate_get_current();
931
e87fae4c
MA		 932 /* TODO use QAPI_CLONE() instead of duplicating it inline */
933
7f375e04
EB		 934 if (params->has_compress_level) {
935 s->parameters.compress_level = params->compress_level;
85de8323 936 }
476c72aa 937
7f375e04
EB		 938 if (params->has_compress_threads) {
939 s->parameters.compress_threads = params->compress_threads;
85de8323 940 }
476c72aa 941
7f375e04
EB		 942 if (params->has_decompress_threads) {
943 s->parameters.decompress_threads = params->decompress_threads;
85de8323 944 }
476c72aa 945
7f375e04
EB		 946 if (params->has_cpu_throttle_initial) {
947 s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
1626fee3 948 }
476c72aa 949
7f375e04
EB		 950 if (params->has_cpu_throttle_increment) {
951 s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
1626fee3 952 }
476c72aa 953
7f375e04 954 if (params->has_tls_creds) {
69ef1f36 955 g_free(s->parameters.tls_creds);
01fa5598
MA		 956 assert(params->tls_creds->type == QTYPE_QSTRING);
957 s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
69ef1f36 958 }
476c72aa 959
7f375e04 960 if (params->has_tls_hostname) {
69ef1f36 961 g_free(s->parameters.tls_hostname);
01fa5598
MA		 962 assert(params->tls_hostname->type == QTYPE_QSTRING);
963 s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
69ef1f36 964 }
476c72aa 965
2ff30257
AA		 966 if (params->has_max_bandwidth) {
967 s->parameters.max_bandwidth = params->max_bandwidth;
968 if (s->to_dst_file) {
969 qemu_file_set_rate_limit(s->to_dst_file,
970 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
971 }
972 }
476c72aa 973
2ff30257
AA		 974 if (params->has_downtime_limit) {
975 s->parameters.downtime_limit = params->downtime_limit;
976 }
68b53591
HZ		 977
978 if (params->has_x_checkpoint_delay) {
979 s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
479125d5
HZ		 980 if (migration_in_colo_state()) {
981 colo_checkpoint_notify(s);
982 }
68b53591 983 }
476c72aa 984
2833c59b
JQ		 985 if (params->has_block_incremental) {
986 s->parameters.block_incremental = params->block_incremental;
987 }
4075fb1c
JQ		 988 if (params->has_x_multifd_channels) {
989 s->parameters.x_multifd_channels = params->x_multifd_channels;
990 }
0fb86605
JQ		 991 if (params->has_x_multifd_page_count) {
992 s->parameters.x_multifd_page_count = params->x_multifd_page_count;
993 }
73af8dd8
JQ		 994 if (params->has_xbzrle_cache_size) {
995 s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
996 xbzrle_cache_resize(params->xbzrle_cache_size, errp);
997 }
85de8323
LL		 998}
999
1bda8b3c 1000void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
476c72aa 1001{
1bda8b3c
MA		 1002 MigrationParameters tmp;
1003
01fa5598
MA		 1004 /* TODO Rewrite "" to null instead */
1005 if (params->has_tls_creds
1006 && params->tls_creds->type == QTYPE_QNULL) {
1007 QDECREF(params->tls_creds->u.n);
1008 params->tls_creds->type = QTYPE_QSTRING;
1009 params->tls_creds->u.s = strdup("");
1010 }
1011 /* TODO Rewrite "" to null instead */
1012 if (params->has_tls_hostname
1013 && params->tls_hostname->type == QTYPE_QNULL) {
1014 QDECREF(params->tls_hostname->u.n);
1015 params->tls_hostname->type = QTYPE_QSTRING;
1016 params->tls_hostname->u.s = strdup("");
1017 }
1018
1bda8b3c
MA		 1019 migrate_params_test_apply(params, &tmp);
1020
1021 if (!migrate_params_check(&tmp, errp)) {
476c72aa
PX		 1022 /* Invalid parameter */
1023 return;
1024 }
1025
73af8dd8 1026 migrate_params_apply(params, errp);
476c72aa
PX		 1027}
1028
2594f56d 1029
4886a1bc
DDAG		 1030void qmp_migrate_start_postcopy(Error **errp)
1031{
1032 MigrationState *s = migrate_get_current();
1033
1034 if (!migrate_postcopy_ram()) {
a54d340b 1035 error_setg(errp, "Enable postcopy with migrate_set_capability before"
4886a1bc
DDAG		 1036 " the start of migration");
1037 return;
1038 }
1039
1040 if (s->state == MIGRATION_STATUS_NONE) {
1041 error_setg(errp, "Postcopy must be started after migration has been"
1042 " started");
1043 return;
1044 }
1045 /*
1046 * we don't error if migration has finished since that would be racy
1047 * with issuing this command.
1048 */
1049 atomic_set(&s->start_postcopy, true);
1050}
1051
065e2813
AL		 1052/* shared migration helpers */
1053
48781e5b 1054void migrate_set_state(int *state, int old_state, int new_state)
51cf4c1a 1055{
a31fedee 1056 assert(new_state < MIGRATION_STATUS__MAX);
48781e5b 1057 if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
a31fedee 1058 trace_migrate_set_state(MigrationStatus_str(new_state));
b05dc723 1059 migrate_generate_event(new_state);
51cf4c1a
Z		 1060 }
1061}
1062
4e4a3d3a
PX		 1063static MigrationCapabilityStatusList *migrate_cap_add(
1064 MigrationCapabilityStatusList *list,
1065 MigrationCapability index,
1066 bool state)
2833c59b
JQ		 1067{
1068 MigrationCapabilityStatusList *cap;
1069
1070 cap = g_new0(MigrationCapabilityStatusList, 1);
1071 cap->value = g_new0(MigrationCapabilityStatus, 1);
4e4a3d3a
PX		 1072 cap->value->capability = index;
1073 cap->value->state = state;
1074 cap->next = list;
1075
1076 return cap;
1077}
1078
1079void migrate_set_block_enabled(bool value, Error **errp)
1080{
1081 MigrationCapabilityStatusList *cap;
1082
1083 cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value);
2833c59b
JQ		 1084 qmp_migrate_set_capabilities(cap, errp);
1085 qapi_free_MigrationCapabilityStatusList(cap);
1086}
1087
1088static void migrate_set_block_incremental(MigrationState *s, bool value)
1089{
1090 s->parameters.block_incremental = value;
1091}
1092
1093static void block_cleanup_parameters(MigrationState *s)
1094{
1095 if (s->must_remove_block_options) {
1096 /* setting to false can never fail */
1097 migrate_set_block_enabled(false, &error_abort);
1098 migrate_set_block_incremental(s, false);
1099 s->must_remove_block_options = false;
1100 }
1101}
1102
bb1fadc4 1103static void migrate_fd_cleanup(void *opaque)
065e2813 1104{
bb1fadc4
PB		 1105 MigrationState *s = opaque;
1106
1107 qemu_bh_delete(s->cleanup_bh);
1108 s->cleanup_bh = NULL;
1109
0ceccd85
PX		 1110 qemu_savevm_state_cleanup();
1111
89a02a9f 1112 if (s->to_dst_file) {
f986c3d2
JQ		 1113 Error *local_err = NULL;
1114
9013dca5 1115 trace_migrate_fd_cleanup();
404a7c05 1116 qemu_mutex_unlock_iothread();
1d34e4bf
DDAG		 1117 if (s->migration_thread_running) {
1118 qemu_thread_join(&s->thread);
1119 s->migration_thread_running = false;
1120 }
404a7c05
PB		 1121 qemu_mutex_lock_iothread();
1122
f986c3d2
JQ		 1123 if (multifd_save_cleanup(&local_err) != 0) {
1124 error_report_err(local_err);
1125 }
89a02a9f
HZ		 1126 qemu_fclose(s->to_dst_file);
1127 s->to_dst_file = NULL;
065e2813
AL		 1128 }
1129
9ec055ae
DDAG		 1130 assert((s->state != MIGRATION_STATUS_ACTIVE) &&
1131 (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE));
7a2c1721 1132
94f5a437 1133 if (s->state == MIGRATION_STATUS_CANCELLING) {
48781e5b 1134 migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING,
94f5a437 1135 MIGRATION_STATUS_CANCELLED);
7a2c1721 1136 }
a3fa1d78 1137
87db1a7d
JQ		 1138 if (s->error) {
1139 /* It is used on info migrate. We can't free it */
1140 error_report_err(error_copy(s->error));
1141 }
a3fa1d78 1142 notifier_list_notify(&migration_state_notifiers, s);
2833c59b 1143 block_cleanup_parameters(s);
065e2813
AL		 1144}
1145
87db1a7d
JQ		 1146void migrate_set_error(MigrationState *s, const Error *error)
1147{
1148 qemu_mutex_lock(&s->error_mutex);
1149 if (!s->error) {
1150 s->error = error_copy(error);
1151 }
1152 qemu_mutex_unlock(&s->error_mutex);
1153}
1154
d59ce6f3 1155void migrate_fd_error(MigrationState *s, const Error *error)
065e2813 1156{
25174055 1157 trace_migrate_fd_error(error_get_pretty(error));
89a02a9f 1158 assert(s->to_dst_file == NULL);
48781e5b
HZ		 1159 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1160 MIGRATION_STATUS_FAILED);
87db1a7d 1161 migrate_set_error(s, error);
bb1fadc4 1162 notifier_list_notify(&migration_state_notifiers, s);
2833c59b 1163 block_cleanup_parameters(s);
458cf28e
JQ		 1164}
1165
0edda1c4 1166static void migrate_fd_cancel(MigrationState *s)
065e2813 1167{
6f2b811a 1168 int old_state ;
89a02a9f 1169 QEMUFile *f = migrate_get_current()->to_dst_file;
9013dca5 1170 trace_migrate_fd_cancel();
065e2813 1171
70b20477
DDAG		 1172 if (s->rp_state.from_dst_file) {
1173 /* shutdown the rp socket, so causing the rp thread to shutdown */
1174 qemu_file_shutdown(s->rp_state.from_dst_file);
1175 }
1176
6f2b811a
Z		 1177 do {
1178 old_state = s->state;
f6844b99 1179 if (!migration_is_setup_or_active(old_state)) {
6f2b811a
Z		 1180 break;
1181 }
a7b36b48
DDAG		 1182 /* If the migration is paused, kick it out of the pause */
1183 if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) {
1184 qemu_sem_post(&s->pause_sem);
1185 }
48781e5b 1186 migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
31194731 1187 } while (s->state != MIGRATION_STATUS_CANCELLING);
a26ba26e
DDAG		 1188
1189 /*
1190 * If we're unlucky the migration code might be stuck somewhere in a
1191 * send/write while the network has failed and is waiting to timeout;
1192 * if we've got shutdown(2) available then we can force it to quit.
1193 * The outgoing qemu file gets closed in migrate_fd_cleanup that is
1194 * called in a bh, so there is no race against this cancel.
1195 */
31194731 1196 if (s->state == MIGRATION_STATUS_CANCELLING && f) {
a26ba26e
DDAG		 1197 qemu_file_shutdown(f);
1198 }
1d2acc31
HZ		 1199 if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) {
1200 Error *local_err = NULL;
1201
1202 bdrv_invalidate_cache_all(&local_err);
1203 if (local_err) {
1204 error_report_err(local_err);
1205 } else {
1206 s->block_inactive = false;
1207 }
1208 }
2833c59b 1209 block_cleanup_parameters(s);
065e2813
AL		 1210}
1211
99a0db9b
GH		 1212void add_migration_state_change_notifier(Notifier *notify)
1213{
1214 notifier_list_add(&migration_state_notifiers, notify);
1215}
1216
1217void remove_migration_state_change_notifier(Notifier *notify)
1218{
31552529 1219 notifier_remove(notify);
99a0db9b
GH		 1220}
1221
02edd2e7 1222bool migration_in_setup(MigrationState *s)
afe2df69 1223{
31194731 1224 return s->state == MIGRATION_STATUS_SETUP;
afe2df69
GH		 1225}
1226
7073693b 1227bool migration_has_finished(MigrationState *s)
99a0db9b 1228{
31194731 1229 return s->state == MIGRATION_STATUS_COMPLETED;
99a0db9b 1230}
0edda1c4 1231
afe2df69
GH		 1232bool migration_has_failed(MigrationState *s)
1233{
31194731
HZ		 1234 return (s->state == MIGRATION_STATUS_CANCELLED ||
1235 s->state == MIGRATION_STATUS_FAILED);
afe2df69
GH		 1236}
1237
5727309d 1238bool migration_in_postcopy(void)
9ec055ae 1239{
5727309d
JQ		 1240 MigrationState *s = migrate_get_current();
1241
9ec055ae
DDAG		 1242 return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
1243}
1244
b82fc321
DDAG		 1245bool migration_in_postcopy_after_devices(MigrationState *s)
1246{
5727309d 1247 return migration_in_postcopy() && s->postcopy_after_devices;
b82fc321
DDAG		 1248}
1249
fab35005 1250bool migration_is_idle(void)
fe44dc91 1251{
fab35005 1252 MigrationState *s = migrate_get_current();
fe44dc91
AA		 1253
1254 switch (s->state) {
1255 case MIGRATION_STATUS_NONE:
1256 case MIGRATION_STATUS_CANCELLED:
1257 case MIGRATION_STATUS_COMPLETED:
1258 case MIGRATION_STATUS_FAILED:
1259 return true;
1260 case MIGRATION_STATUS_SETUP:
1261 case MIGRATION_STATUS_CANCELLING:
1262 case MIGRATION_STATUS_ACTIVE:
1263 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
1264 case MIGRATION_STATUS_COLO:
31e06077
DDAG		 1265 case MIGRATION_STATUS_PRE_SWITCHOVER:
1266 case MIGRATION_STATUS_DEVICE:
fe44dc91
AA		 1267 return false;
1268 case MIGRATION_STATUS__MAX:
1269 g_assert_not_reached();
1270 }
1271
1272 return false;
1273}
1274
a0762d9e 1275MigrationState *migrate_init(void)
0edda1c4 1276{
17549e84 1277 MigrationState *s = migrate_get_current();
bbf6da32 1278
389775d1
DDAG		 1279 /*
1280 * Reinitialise all migration state, except
1281 * parameters/capabilities that the user set, and
1282 * locks.
1283 */
1284 s->bytes_xfer = 0;
1285 s->xfer_limit = 0;
1286 s->cleanup_bh = 0;
89a02a9f 1287 s->to_dst_file = NULL;
389775d1 1288 s->state = MIGRATION_STATUS_NONE;
389775d1
DDAG		 1289 s->rp_state.from_dst_file = NULL;
1290 s->rp_state.error = false;
1291 s->mbps = 0.0;
1292 s->downtime = 0;
1293 s->expected_downtime = 0;
389775d1 1294 s->setup_time = 0;
389775d1 1295 s->start_postcopy = false;
b82fc321 1296 s->postcopy_after_devices = false;
389775d1 1297 s->migration_thread_running = false;
d59ce6f3
DB		 1298 error_free(s->error);
1299 s->error = NULL;
389775d1 1300
48781e5b 1301 migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
0edda1c4 1302
4af246a3
PX		 1303 s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
1304 s->total_time = 0;
7287cbd4 1305 s->vm_was_running = false;
0edda1c4
JQ		 1306 return s;
1307}
cab30143 1308
fa2756b7
AL		 1309static GSList *migration_blockers;
1310
fe44dc91 1311int migrate_add_blocker(Error *reason, Error **errp)
fa2756b7 1312{
3df663e5 1313 if (migrate_get_current()->only_migratable) {
b67b8c3a
AA		 1314 error_propagate(errp, error_copy(reason));
1315 error_prepend(errp, "disallowing migration blocker "
1316 "(--only_migratable) for: ");
1317 return -EACCES;
1318 }
1319
fab35005 1320 if (migration_is_idle()) {
fe44dc91
AA		 1321 migration_blockers = g_slist_prepend(migration_blockers, reason);
1322 return 0;
1323 }
1324
1325 error_propagate(errp, error_copy(reason));
1326 error_prepend(errp, "disallowing migration blocker (migration in "
1327 "progress) for: ");
1328 return -EBUSY;
fa2756b7
AL		 1329}
1330
1331void migrate_del_blocker(Error *reason)
1332{
1333 migration_blockers = g_slist_remove(migration_blockers, reason);
1334}
1335
bf1ae1f4
DDAG		 1336void qmp_migrate_incoming(const char *uri, Error **errp)
1337{
1338 Error *local_err = NULL;
4debb5f5 1339 static bool once = true;
bf1ae1f4
DDAG		 1340
1341 if (!deferred_incoming) {
4debb5f5 1342 error_setg(errp, "For use with '-incoming defer'");
bf1ae1f4
DDAG		 1343 return;
1344 }
4debb5f5
DDAG		 1345 if (!once) {
1346 error_setg(errp, "The incoming migration has already been started");
1347 }
bf1ae1f4
DDAG		 1348
1349 qemu_start_incoming_migration(uri, &local_err);
1350
1351 if (local_err) {
1352 error_propagate(errp, local_err);
1353 return;
1354 }
1355
4debb5f5 1356 once = false;
bf1ae1f4
DDAG		 1357}
1358
24f3902b
GK		 1359bool migration_is_blocked(Error **errp)
1360{
1361 if (qemu_savevm_state_blocked(errp)) {
1362 return true;
1363 }
1364
1365 if (migration_blockers) {
250561e1 1366 error_propagate(errp, error_copy(migration_blockers->data));
24f3902b
GK		 1367 return true;
1368 }
1369
1370 return false;
1371}
1372
e1c37d0e
LC		 1373void qmp_migrate(const char *uri, bool has_blk, bool blk,
1374 bool has_inc, bool inc, bool has_detach, bool detach,
1375 Error **errp)
cab30143 1376{
be7059cd 1377 Error *local_err = NULL;
17549e84 1378 MigrationState *s = migrate_get_current();
cab30143 1379 const char *p;
cab30143 1380
f6844b99 1381 if (migration_is_setup_or_active(s->state) ||
0b827d5e
HZ		 1382 s->state == MIGRATION_STATUS_CANCELLING ||
1383 s->state == MIGRATION_STATUS_COLO) {
c6bd8c70 1384 error_setg(errp, QERR_MIGRATION_ACTIVE);
e1c37d0e 1385 return;
cab30143 1386 }
ca99993a
DDAG		 1387 if (runstate_check(RUN_STATE_INMIGRATE)) {
1388 error_setg(errp, "Guest is waiting for an incoming migration");
1389 return;
1390 }
1391
24f3902b 1392 if (migration_is_blocked(errp)) {
e1c37d0e 1393 return;
fa2756b7
AL		 1394 }
1395
2833c59b
JQ		 1396 if ((has_blk && blk) || (has_inc && inc)) {
1397 if (migrate_use_block() || migrate_use_block_incremental()) {
1398 error_setg(errp, "Command options are incompatible with "
1399 "current migration capabilities");
1400 return;
1401 }
1402 migrate_set_block_enabled(true, &local_err);
1403 if (local_err) {
1404 error_propagate(errp, local_err);
1405 return;
1406 }
1407 s->must_remove_block_options = true;
1408 }
1409
1410 if (has_inc && inc) {
1411 migrate_set_block_incremental(s, true);
1412 }
1413
a0762d9e 1414 s = migrate_init();
cab30143
JQ		 1415
1416 if (strstart(uri, "tcp:", &p)) {
f37afb5a 1417 tcp_start_outgoing_migration(s, p, &local_err);
2da776db 1418#ifdef CONFIG_RDMA
41310c68 1419 } else if (strstart(uri, "rdma:", &p)) {
2da776db
MH		 1420 rdma_start_outgoing_migration(s, p, &local_err);
1421#endif
cab30143 1422 } else if (strstart(uri, "exec:", &p)) {
f37afb5a 1423 exec_start_outgoing_migration(s, p, &local_err);
cab30143 1424 } else if (strstart(uri, "unix:", &p)) {
f37afb5a 1425 unix_start_outgoing_migration(s, p, &local_err);
cab30143 1426 } else if (strstart(uri, "fd:", &p)) {
f37afb5a 1427 fd_start_outgoing_migration(s, p, &local_err);
99a0db9b 1428 } else {
c6bd8c70
MA		 1429 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
1430 "a valid migration protocol");
48781e5b
HZ		 1431 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1432 MIGRATION_STATUS_FAILED);
e1c37d0e 1433 return;
cab30143
JQ		 1434 }
1435
f37afb5a 1436 if (local_err) {
d59ce6f3 1437 migrate_fd_error(s, local_err);
f37afb5a 1438 error_propagate(errp, local_err);
e1c37d0e 1439 return;
1299c631 1440 }
cab30143
JQ		 1441}
1442
6cdedb07 1443void qmp_migrate_cancel(Error **errp)
cab30143 1444{
17549e84 1445 migrate_fd_cancel(migrate_get_current());
cab30143
JQ		 1446}
1447
89cfc02c
DDAG		 1448void qmp_migrate_continue(MigrationStatus state, Error **errp)
1449{
1450 MigrationState *s = migrate_get_current();
1451 if (s->state != state) {
1452 error_setg(errp, "Migration not in expected state: %s",
1453 MigrationStatus_str(s->state));
1454 return;
1455 }
1456 qemu_sem_post(&s->pause_sem);
1457}
1458
9e1ba4cc
OW		 1459void qmp_migrate_set_cache_size(int64_t value, Error **errp)
1460{
73af8dd8
JQ		 1461 MigrateSetParameters p = {
1462 .has_xbzrle_cache_size = true,
1463 .xbzrle_cache_size = value,
1464 };
c91e681a 1465
73af8dd8 1466 qmp_migrate_set_parameters(&p, errp);
9e1ba4cc
OW		 1467}
1468
1469int64_t qmp_query_migrate_cache_size(Error **errp)
1470{
1471 return migrate_xbzrle_cache_size();
1472}
1473
3dc85383 1474void qmp_migrate_set_speed(int64_t value, Error **errp)
cab30143 1475{
1bda8b3c 1476 MigrateSetParameters p = {
2ff30257
AA		 1477 .has_max_bandwidth = true,
1478 .max_bandwidth = value,
1479 };
cab30143 1480
2ff30257 1481 qmp_migrate_set_parameters(&p, errp);
cab30143
JQ		 1482}
1483
4f0a993b 1484void qmp_migrate_set_downtime(double value, Error **errp)
cab30143 1485{
87c9cc1c
DHB		 1486 if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) {
1487 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
1488 "the range of 0 to %d seconds",
1489 MAX_MIGRATE_DOWNTIME_SECONDS);
1490 return;
1491 }
1492
2ff30257
AA		 1493 value *= 1000; /* Convert to milliseconds */
1494 value = MAX(0, MIN(INT64_MAX, value));
1495
1bda8b3c 1496 MigrateSetParameters p = {
2ff30257
AA		 1497 .has_downtime_limit = true,
1498 .downtime_limit = value,
1499 };
1500
1501 qmp_migrate_set_parameters(&p, errp);
99a0db9b 1502}
17ad9b35 1503
53f09a10
PB		 1504bool migrate_release_ram(void)
1505{
1506 MigrationState *s;
1507
1508 s = migrate_get_current();
1509
1510 return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
1511}
1512
53dd370c
DDAG		 1513bool migrate_postcopy_ram(void)
1514{
1515 MigrationState *s;
1516
1517 s = migrate_get_current();
1518
32c3db5b 1519 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
53dd370c
DDAG		 1520}
1521
58110f0a
VSO		 1522bool migrate_postcopy(void)
1523{
1524 return migrate_postcopy_ram();
1525}
1526
bde1e2ec
CV		 1527bool migrate_auto_converge(void)
1528{
1529 MigrationState *s;
1530
1531 s = migrate_get_current();
1532
1533 return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
1534}
1535
323004a3
PL		 1536bool migrate_zero_blocks(void)
1537{
1538 MigrationState *s;
1539
1540 s = migrate_get_current();
1541
1542 return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
1543}
1544
31bf06a9
AP		 1545bool migrate_postcopy_blocktime(void)
1546{
1547 MigrationState *s;
1548
1549 s = migrate_get_current();
1550
1551 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_BLOCKTIME];
1552}
1553
8706d2d5
LL		 1554bool migrate_use_compression(void)
1555{
dde4e694
LL		 1556 MigrationState *s;
1557
1558 s = migrate_get_current();
1559
1560 return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
8706d2d5
LL		 1561}
1562
1563int migrate_compress_level(void)
1564{
1565 MigrationState *s;
1566
1567 s = migrate_get_current();
1568
2594f56d 1569 return s->parameters.compress_level;
8706d2d5
LL		 1570}
1571
1572int migrate_compress_threads(void)
1573{
1574 MigrationState *s;
1575
1576 s = migrate_get_current();
1577
2594f56d 1578 return s->parameters.compress_threads;
8706d2d5
LL		 1579}
1580
3fcb38c2
LL		 1581int migrate_decompress_threads(void)
1582{
1583 MigrationState *s;
1584
1585 s = migrate_get_current();
1586
2594f56d 1587 return s->parameters.decompress_threads;
3fcb38c2
LL		 1588}
1589
b05dc723
JQ		 1590bool migrate_use_events(void)
1591{
1592 MigrationState *s;
1593
1594 s = migrate_get_current();
1595
1596 return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
1597}
1598
30126bbf
JQ		 1599bool migrate_use_multifd(void)
1600{
1601 MigrationState *s;
1602
1603 s = migrate_get_current();
1604
1605 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_MULTIFD];
1606}
1607
93fbd031
DDAG		 1608bool migrate_pause_before_switchover(void)
1609{
1610 MigrationState *s;
1611
1612 s = migrate_get_current();
1613
1614 return s->enabled_capabilities[
1615 MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
1616}
1617
4075fb1c
JQ		 1618int migrate_multifd_channels(void)
1619{
1620 MigrationState *s;
1621
1622 s = migrate_get_current();
1623
1624 return s->parameters.x_multifd_channels;
1625}
1626
0fb86605
JQ		 1627int migrate_multifd_page_count(void)
1628{
1629 MigrationState *s;
1630
1631 s = migrate_get_current();
1632
1633 return s->parameters.x_multifd_page_count;
1634}
1635
17ad9b35
OW		 1636int migrate_use_xbzrle(void)
1637{
1638 MigrationState *s;
1639
1640 s = migrate_get_current();
1641
1642 return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
1643}
1644
1645int64_t migrate_xbzrle_cache_size(void)
1646{
1647 MigrationState *s;
1648
1649 s = migrate_get_current();
1650
73af8dd8 1651 return s->parameters.xbzrle_cache_size;
17ad9b35 1652}
0d82d0e8 1653
2833c59b
JQ		 1654bool migrate_use_block(void)
1655{
1656 MigrationState *s;
1657
1658 s = migrate_get_current();
1659
1660 return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK];
1661}
1662
c788ada8
PX		 1663bool migrate_use_return_path(void)
1664{
1665 MigrationState *s;
1666
1667 s = migrate_get_current();
1668
1669 return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
1670}
1671
2833c59b
JQ		 1672bool migrate_use_block_incremental(void)
1673{
1674 MigrationState *s;
1675
1676 s = migrate_get_current();
1677
1678 return s->parameters.block_incremental;
1679}
1680
70b20477
DDAG		 1681/* migration thread support */
1682/*
1683 * Something bad happened to the RP stream, mark an error
1684 * The caller shall print or trace something to indicate why
1685 */
1686static void mark_source_rp_bad(MigrationState *s)
1687{
1688 s->rp_state.error = true;
1689}
1690
1691static struct rp_cmd_args {
1692 ssize_t len; /* -1 = variable */
1693 const char *name;
1694} rp_cmd_args[] = {
1695 [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" },
1696 [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" },
1697 [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" },
1e2d90eb
DDAG		 1698 [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" },
1699 [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" },
70b20477
DDAG		 1700 [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" },
1701};
1702
1e2d90eb
DDAG		 1703/*
1704 * Process a request for pages received on the return path,
1705 * We're allowed to send more than requested (e.g. to round to our page size)
1706 * and we don't need to send pages that have already been sent.
1707 */
1708static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
1709 ram_addr_t start, size_t len)
1710{
6c595cde
DDAG		 1711 long our_host_ps = getpagesize();
1712
1e2d90eb 1713 trace_migrate_handle_rp_req_pages(rbname, start, len);
6c595cde
DDAG		 1714
1715 /*
1716 * Since we currently insist on matching page sizes, just sanity check
1717 * we're being asked for whole host pages.
1718 */
1719 if (start & (our_host_ps-1) ||
1720 (len & (our_host_ps-1))) {
1721 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
1722 " len: %zd", __func__, start, len);
1723 mark_source_rp_bad(ms);
1724 return;
1725 }
1726
96506894 1727 if (ram_save_queue_pages(rbname, start, len)) {
6c595cde
DDAG		 1728 mark_source_rp_bad(ms);
1729 }
1e2d90eb
DDAG		 1730}
1731
70b20477
DDAG		 1732/*
1733 * Handles messages sent on the return path towards the source VM
1734 *
1735 */
1736static void *source_return_path_thread(void *opaque)
1737{
1738 MigrationState *ms = opaque;
1739 QEMUFile *rp = ms->rp_state.from_dst_file;
1740 uint16_t header_len, header_type;
568b01ca 1741 uint8_t buf[512];
70b20477 1742 uint32_t tmp32, sibling_error;
1e2d90eb
DDAG		 1743 ram_addr_t start = 0; /* =0 to silence warning */
1744 size_t len = 0, expected_len;
70b20477
DDAG		 1745 int res;
1746
1747 trace_source_return_path_thread_entry();
1748 while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
1749 migration_is_setup_or_active(ms->state)) {
1750 trace_source_return_path_thread_loop_top();
1751 header_type = qemu_get_be16(rp);
1752 header_len = qemu_get_be16(rp);
1753
1754 if (header_type >= MIG_RP_MSG_MAX ||
1755 header_type == MIG_RP_MSG_INVALID) {
1756 error_report("RP: Received invalid message 0x%04x length 0x%04x",
1757 header_type, header_len);
1758 mark_source_rp_bad(ms);
1759 goto out;
1760 }
1761
1762 if ((rp_cmd_args[header_type].len != -1 &&
1763 header_len != rp_cmd_args[header_type].len) ||
568b01ca 1764 header_len > sizeof(buf)) {
70b20477
DDAG		 1765 error_report("RP: Received '%s' message (0x%04x) with"
1766 "incorrect length %d expecting %zu",
1767 rp_cmd_args[header_type].name, header_type, header_len,
1768 (size_t)rp_cmd_args[header_type].len);
1769 mark_source_rp_bad(ms);
1770 goto out;
1771 }
1772
1773 /* We know we've got a valid header by this point */
1774 res = qemu_get_buffer(rp, buf, header_len);
1775 if (res != header_len) {
1776 error_report("RP: Failed reading data for message 0x%04x"
1777 " read %d expected %d",
1778 header_type, res, header_len);
1779 mark_source_rp_bad(ms);
1780 goto out;
1781 }
1782
1783 /* OK, we have the message and the data */
1784 switch (header_type) {
1785 case MIG_RP_MSG_SHUT:
4d885131 1786 sibling_error = ldl_be_p(buf);
70b20477
DDAG		 1787 trace_source_return_path_thread_shut(sibling_error);
1788 if (sibling_error) {
1789 error_report("RP: Sibling indicated error %d", sibling_error);
1790 mark_source_rp_bad(ms);
1791 }
1792 /*
1793 * We'll let the main thread deal with closing the RP
1794 * we could do a shutdown(2) on it, but we're the only user
1795 * anyway, so there's nothing gained.
1796 */
1797 goto out;
1798
1799 case MIG_RP_MSG_PONG:
4d885131 1800 tmp32 = ldl_be_p(buf);
70b20477
DDAG		 1801 trace_source_return_path_thread_pong(tmp32);
1802 break;
1803
1e2d90eb 1804 case MIG_RP_MSG_REQ_PAGES:
4d885131
PM		 1805 start = ldq_be_p(buf);
1806 len = ldl_be_p(buf + 8);
1e2d90eb
DDAG		 1807 migrate_handle_rp_req_pages(ms, NULL, start, len);
1808 break;
1809
1810 case MIG_RP_MSG_REQ_PAGES_ID:
1811 expected_len = 12 + 1; /* header + termination */
1812
1813 if (header_len >= expected_len) {
4d885131
PM		 1814 start = ldq_be_p(buf);
1815 len = ldl_be_p(buf + 8);
1e2d90eb
DDAG		 1816 /* Now we expect an idstr */
1817 tmp32 = buf[12]; /* Length of the following idstr */
1818 buf[13 + tmp32] = '\0';
1819 expected_len += tmp32;
1820 }
1821 if (header_len != expected_len) {
1822 error_report("RP: Req_Page_id with length %d expecting %zd",
1823 header_len, expected_len);
1824 mark_source_rp_bad(ms);
1825 goto out;
1826 }
1827 migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len);
1828 break;
1829
70b20477
DDAG		 1830 default:
1831 break;
1832 }
1833 }
5df5416e 1834 if (qemu_file_get_error(rp)) {
70b20477
DDAG		 1835 trace_source_return_path_thread_bad_end();
1836 mark_source_rp_bad(ms);
1837 }
1838
1839 trace_source_return_path_thread_end();
1840out:
1841 ms->rp_state.from_dst_file = NULL;
1842 qemu_fclose(rp);
1843 return NULL;
1844}
1845
70b20477
DDAG		 1846static int open_return_path_on_source(MigrationState *ms)
1847{
1848
89a02a9f 1849 ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file);
70b20477
DDAG		 1850 if (!ms->rp_state.from_dst_file) {
1851 return -1;
1852 }
1853
1854 trace_open_return_path_on_source();
1855 qemu_thread_create(&ms->rp_state.rp_thread, "return path",
1856 source_return_path_thread, ms, QEMU_THREAD_JOINABLE);
1857
1858 trace_open_return_path_on_source_continue();
1859
1860 return 0;
1861}
1862
70b20477
DDAG		 1863/* Returns 0 if the RP was ok, otherwise there was an error on the RP */
1864static int await_return_path_close_on_source(MigrationState *ms)
1865{
1866 /*
1867 * If this is a normal exit then the destination will send a SHUT and the
1868 * rp_thread will exit, however if there's an error we need to cause
1869 * it to exit.
1870 */
89a02a9f 1871 if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) {
70b20477
DDAG		 1872 /*
1873 * shutdown(2), if we have it, will cause it to unblock if it's stuck
1874 * waiting for the destination.
1875 */
1876 qemu_file_shutdown(ms->rp_state.from_dst_file);
1877 mark_source_rp_bad(ms);
1878 }
1879 trace_await_return_path_close_on_source_joining();
1880 qemu_thread_join(&ms->rp_state.rp_thread);
1881 trace_await_return_path_close_on_source_close();
1882 return ms->rp_state.error;
1883}
1884
1d34e4bf
DDAG		 1885/*
1886 * Switch from normal iteration to postcopy
1887 * Returns non-0 on error
1888 */
7287cbd4 1889static int postcopy_start(MigrationState *ms)
1d34e4bf
DDAG		 1890{
1891 int ret;
61b67d47
DB		 1892 QIOChannelBuffer *bioc;
1893 QEMUFile *fb;
1d34e4bf 1894 int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
ef8d6488 1895 bool restart_block = false;
0331c8ca
DDAG		 1896 int cur_state = MIGRATION_STATUS_ACTIVE;
1897 if (!migrate_pause_before_switchover()) {
1898 migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
1899 MIGRATION_STATUS_POSTCOPY_ACTIVE);
1900 }
1d34e4bf
DDAG		 1901
1902 trace_postcopy_start();
1903 qemu_mutex_lock_iothread();
1904 trace_postcopy_start_set_run();
1905
1906 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
1d34e4bf
DDAG		 1907 global_state_store();
1908 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
76b1c7fe
KW		 1909 if (ret < 0) {
1910 goto fail;
1911 }
1d34e4bf 1912
0331c8ca
DDAG		 1913 ret = migration_maybe_pause(ms, &cur_state,
1914 MIGRATION_STATUS_POSTCOPY_ACTIVE);
1915 if (ret < 0) {
1916 goto fail;
1917 }
1918
76b1c7fe 1919 ret = bdrv_inactivate_all();
1d34e4bf
DDAG		 1920 if (ret < 0) {
1921 goto fail;
1922 }
ef8d6488 1923 restart_block = true;
1d34e4bf 1924
1c0d249d
DDAG		 1925 /*
1926 * Cause any non-postcopiable, but iterative devices to
1927 * send out their final data.
1928 */
a1fbe750 1929 qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false);
1c0d249d 1930
1d34e4bf
DDAG		 1931 /*
1932 * in Finish migrate and with the io-lock held everything should
1933 * be quiet, but we've potentially still got dirty pages and we
1934 * need to tell the destination to throw any pages it's already received
1935 * that are dirty
1936 */
58110f0a
VSO		 1937 if (migrate_postcopy_ram()) {
1938 if (ram_postcopy_send_discard_bitmap(ms)) {
1939 error_report("postcopy send discard bitmap failed");
1940 goto fail;
1941 }
1d34e4bf
DDAG		 1942 }
1943
1944 /*
1945 * send rest of state - note things that are doing postcopy
1946 * will notice we're in POSTCOPY_ACTIVE and not actually
1947 * wrap their state up here
1948 */
89a02a9f 1949 qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
58110f0a
VSO		 1950 if (migrate_postcopy_ram()) {
1951 /* Ping just for debugging, helps line traces up */
1952 qemu_savevm_send_ping(ms->to_dst_file, 2);
1953 }
1d34e4bf
DDAG		 1954
1955 /*
1956 * While loading the device state we may trigger page transfer
1957 * requests and the fd must be free to process those, and thus
1958 * the destination must read the whole device state off the fd before
1959 * it starts processing it. Unfortunately the ad-hoc migration format
1960 * doesn't allow the destination to know the size to read without fully
1961 * parsing it through each devices load-state code (especially the open
1962 * coded devices that use get/put).
1963 * So we wrap the device state up in a package with a length at the start;
1964 * to do this we use a qemu_buf to hold the whole of the device state.
1965 */
61b67d47 1966 bioc = qio_channel_buffer_new(4096);
6f01f136 1967 qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer");
61b67d47
DB		 1968 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
1969 object_unref(OBJECT(bioc));
1d34e4bf 1970
c76201ab
DDAG		 1971 /*
1972 * Make sure the receiver can get incoming pages before we send the rest
1973 * of the state
1974 */
1975 qemu_savevm_send_postcopy_listen(fb);
1976
a1fbe750 1977 qemu_savevm_state_complete_precopy(fb, false, false);
58110f0a
VSO		 1978 if (migrate_postcopy_ram()) {
1979 qemu_savevm_send_ping(fb, 3);
1980 }
1d34e4bf
DDAG		 1981
1982 qemu_savevm_send_postcopy_run(fb);
1983
1984 /* <><> end of stuff going into the package */
1d34e4bf 1985
ef8d6488
DDAG		 1986 /* Last point of recovery; as soon as we send the package the destination
1987 * can open devices and potentially start running.
1988 * Lets just check again we've not got any errors.
1989 */
1990 ret = qemu_file_get_error(ms->to_dst_file);
1991 if (ret) {
1992 error_report("postcopy_start: Migration stream errored (pre package)");
1993 goto fail_closefb;
1994 }
1995
1996 restart_block = false;
1997
1d34e4bf 1998 /* Now send that blob */
61b67d47 1999 if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) {
1d34e4bf
DDAG		 2000 goto fail_closefb;
2001 }
2002 qemu_fclose(fb);
b82fc321
DDAG		 2003
2004 /* Send a notify to give a chance for anything that needs to happen
2005 * at the transition to postcopy and after the device state; in particular
2006 * spice needs to trigger a transition now
2007 */
2008 ms->postcopy_after_devices = true;
2009 notifier_list_notify(&migration_state_notifiers, ms);
2010
1d34e4bf
DDAG		 2011 ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop;
2012
2013 qemu_mutex_unlock_iothread();
2014
58110f0a
VSO		 2015 if (migrate_postcopy_ram()) {
2016 /*
2017 * Although this ping is just for debug, it could potentially be
2018 * used for getting a better measurement of downtime at the source.
2019 */
2020 qemu_savevm_send_ping(ms->to_dst_file, 4);
2021 }
1d34e4bf 2022
ced1c616
PB		 2023 if (migrate_release_ram()) {
2024 ram_postcopy_migrated_memory_release(ms);
2025 }
2026
89a02a9f 2027 ret = qemu_file_get_error(ms->to_dst_file);
1d34e4bf
DDAG		 2028 if (ret) {
2029 error_report("postcopy_start: Migration stream errored");
48781e5b 2030 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
1d34e4bf
DDAG		 2031 MIGRATION_STATUS_FAILED);
2032 }
2033
2034 return ret;
2035
2036fail_closefb:
2037 qemu_fclose(fb);
2038fail:
48781e5b 2039 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
1d34e4bf 2040 MIGRATION_STATUS_FAILED);
ef8d6488
DDAG		 2041 if (restart_block) {
2042 /* A failure happened early enough that we know the destination hasn't
2043 * accessed block devices, so we're safe to recover.
2044 */
2045 Error *local_err = NULL;
2046
2047 bdrv_invalidate_cache_all(&local_err);
2048 if (local_err) {
2049 error_report_err(local_err);
2050 }
2051 }
1d34e4bf
DDAG		 2052 qemu_mutex_unlock_iothread();
2053 return -1;
2054}
2055
e91d8951
DDAG		 2056/**
2057 * migration_maybe_pause: Pause if required to by
2058 * migrate_pause_before_switchover called with the iothread locked
2059 * Returns: 0 on success
2060 */
0331c8ca
DDAG		 2061static int migration_maybe_pause(MigrationState *s,
2062 int *current_active_state,
2063 int new_state)
e91d8951
DDAG		 2064{
2065 if (!migrate_pause_before_switchover()) {
2066 return 0;
2067 }
2068
2069 /* Since leaving this state is not atomic with posting the semaphore
2070 * it's possible that someone could have issued multiple migrate_continue
2071 * and the semaphore is incorrectly positive at this point;
2072 * the docs say it's undefined to reinit a semaphore that's already
2073 * init'd, so use timedwait to eat up any existing posts.
2074 */
2075 while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) {
2076 /* This block intentionally left blank */
2077 }
2078
2079 qemu_mutex_unlock_iothread();
2080 migrate_set_state(&s->state, *current_active_state,
2081 MIGRATION_STATUS_PRE_SWITCHOVER);
2082 qemu_sem_wait(&s->pause_sem);
2083 migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
0331c8ca
DDAG		 2084 new_state);
2085 *current_active_state = new_state;
e91d8951
DDAG		 2086 qemu_mutex_lock_iothread();
2087
0331c8ca 2088 return s->state == new_state ? 0 : -EINVAL;
e91d8951
DDAG		 2089}
2090
09f6c85e
DDAG		 2091/**
2092 * migration_completion: Used by migration_thread when there's not much left.
2093 * The caller 'breaks' the loop when this returns.
2094 *
2095 * @s: Current migration state
36f48567 2096 * @current_active_state: The migration state we expect to be in
09f6c85e 2097 */
64909f97 2098static void migration_completion(MigrationState *s, int current_active_state)
09f6c85e
DDAG		 2099{
2100 int ret;
2101
b10ac0c4
DDAG		 2102 if (s->state == MIGRATION_STATUS_ACTIVE) {
2103 qemu_mutex_lock_iothread();
64909f97 2104 s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
b10ac0c4 2105 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
7287cbd4 2106 s->vm_was_running = runstate_is_running();
b10ac0c4
DDAG		 2107 ret = global_state_store();
2108
2109 if (!ret) {
a1fbe750 2110 bool inactivate = !migrate_colo_enabled();
b10ac0c4 2111 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
e91d8951 2112 if (ret >= 0) {
0331c8ca
DDAG		 2113 ret = migration_maybe_pause(s, &current_active_state,
2114 MIGRATION_STATUS_DEVICE);
e91d8951 2115 }
f07fa4cb
KW		 2116 if (ret >= 0) {
2117 qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
a1fbe750
FZ		 2118 ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
2119 inactivate);
f07fa4cb 2120 }
a1fbe750
FZ		 2121 if (inactivate && ret >= 0) {
2122 s->block_inactive = true;
b10ac0c4
DDAG		 2123 }
2124 }
2125 qemu_mutex_unlock_iothread();
09f6c85e 2126
b10ac0c4
DDAG		 2127 if (ret < 0) {
2128 goto fail;
09f6c85e 2129 }
b10ac0c4
DDAG		 2130 } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
2131 trace_migration_completion_postcopy_end();
2132
89a02a9f 2133 qemu_savevm_state_complete_postcopy(s->to_dst_file);
b10ac0c4 2134 trace_migration_completion_postcopy_end_after_complete();
09f6c85e 2135 }
09f6c85e 2136
b10ac0c4
DDAG		 2137 /*
2138 * If rp was opened we must clean up the thread before
2139 * cleaning everything else up (since if there are no failures
2140 * it will wait for the destination to send it's status in
2141 * a SHUT command).
b10ac0c4 2142 */
0425dc97 2143 if (s->rp_state.from_dst_file) {
b10ac0c4 2144 int rp_error;
0425dc97 2145 trace_migration_return_path_end_before();
b10ac0c4 2146 rp_error = await_return_path_close_on_source(s);
0425dc97 2147 trace_migration_return_path_end_after(rp_error);
b10ac0c4 2148 if (rp_error) {
fe904ea8 2149 goto fail_invalidate;
b10ac0c4 2150 }
09f6c85e
DDAG		 2151 }
2152
89a02a9f 2153 if (qemu_file_get_error(s->to_dst_file)) {
09f6c85e 2154 trace_migration_completion_file_err();
fe904ea8 2155 goto fail_invalidate;
09f6c85e
DDAG		 2156 }
2157
0b827d5e
HZ		 2158 if (!migrate_colo_enabled()) {
2159 migrate_set_state(&s->state, current_active_state,
2160 MIGRATION_STATUS_COMPLETED);
2161 }
2162
09f6c85e
DDAG		 2163 return;
2164
fe904ea8
GK		 2165fail_invalidate:
2166 /* If not doing postcopy, vm_start() will be called: let's regain
2167 * control on images.
2168 */
2169 if (s->state == MIGRATION_STATUS_ACTIVE) {
2170 Error *local_err = NULL;
2171
1d2acc31 2172 qemu_mutex_lock_iothread();
fe904ea8
GK		 2173 bdrv_invalidate_cache_all(&local_err);
2174 if (local_err) {
2175 error_report_err(local_err);
1d2acc31
HZ		 2176 } else {
2177 s->block_inactive = false;
fe904ea8 2178 }
1d2acc31 2179 qemu_mutex_unlock_iothread();
fe904ea8
GK		 2180 }
2181
09f6c85e 2182fail:
48781e5b
HZ		 2183 migrate_set_state(&s->state, current_active_state,
2184 MIGRATION_STATUS_FAILED);
09f6c85e
DDAG		 2185}
2186
35a6ed4f
HZ		 2187bool migrate_colo_enabled(void)
2188{
2189 MigrationState *s = migrate_get_current();
2190 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO];
2191}
2192
70b20477
DDAG		 2193/*
2194 * Master migration thread on the source VM.
2195 * It drives the migration and pumps the data down the outgoing channel.
2196 */
5f496a1b 2197static void *migration_thread(void *opaque)
0d82d0e8 2198{
9848a404 2199 MigrationState *s = opaque;
1d34e4bf 2200 /* Used by the bandwidth calcs, updated later */
bc72ad67
AB		 2201 int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2202 int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
be7172e2 2203 int64_t initial_bytes = 0;
faec066a
PX		 2204 /*
2205 * The final stage happens when the remaining data is smaller than
2206 * this threshold; it's calculated from the requested downtime and
2207 * measured bandwidth
2208 */
2209 int64_t threshold_size = 0;
94f5a437 2210 int64_t end_time;
1d34e4bf
DDAG		 2211 bool entered_postcopy = false;
2212 /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */
2213 enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE;
76f5933a 2214
ab28bd23
PB		 2215 rcu_register_thread();
2216
89a02a9f 2217 qemu_savevm_state_header(s->to_dst_file);
1d34e4bf 2218
62a02658
PX		 2219 /*
2220 * If we opened the return path, we need to make sure dst has it
2221 * opened as well.
2222 */
2223 if (s->rp_state.from_dst_file) {
1d34e4bf 2224 /* Now tell the dest that it should open its end so it can reply */
89a02a9f 2225 qemu_savevm_send_open_return_path(s->to_dst_file);
1d34e4bf
DDAG		 2226
2227 /* And do a ping that will make stuff easier to debug */
89a02a9f 2228 qemu_savevm_send_ping(s->to_dst_file, 1);
0425dc97 2229 }
1d34e4bf 2230
58110f0a 2231 if (migrate_postcopy()) {
1d34e4bf
DDAG		 2232 /*
2233 * Tell the destination that we *might* want to do postcopy later;
2234 * if the other end can't do postcopy it should fail now, nice and
2235 * early.
2236 */
89a02a9f 2237 qemu_savevm_send_postcopy_advise(s->to_dst_file);
1d34e4bf
DDAG		 2238 }
2239
9907e842 2240 qemu_savevm_state_setup(s->to_dst_file);
0d82d0e8 2241
bc72ad67 2242 s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
48781e5b
HZ		 2243 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
2244 MIGRATION_STATUS_ACTIVE);
29ae8a41 2245
9ec055ae
DDAG		 2246 trace_migration_thread_setup_complete();
2247
2248 while (s->state == MIGRATION_STATUS_ACTIVE ||
2249 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
a3e879cd 2250 int64_t current_time;
c369f40d 2251 uint64_t pending_size;
0d82d0e8 2252
89a02a9f 2253 if (!qemu_file_rate_limit(s->to_dst_file)) {
c31b098f
DDAG		 2254 uint64_t pend_post, pend_nonpost;
2255
faec066a
PX		 2256 qemu_savevm_state_pending(s->to_dst_file, threshold_size,
2257 &pend_nonpost, &pend_post);
c31b098f 2258 pending_size = pend_nonpost + pend_post;
faec066a 2259 trace_migrate_pending(pending_size, threshold_size,
c31b098f 2260 pend_post, pend_nonpost);
faec066a 2261 if (pending_size && pending_size >= threshold_size) {
1d34e4bf
DDAG		 2262 /* Still a significant amount to transfer */
2263
58110f0a 2264 if (migrate_postcopy() &&
1d34e4bf 2265 s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE &&
faec066a 2266 pend_nonpost <= threshold_size &&
1d34e4bf
DDAG		 2267 atomic_read(&s->start_postcopy)) {
2268
7287cbd4 2269 if (!postcopy_start(s)) {
1d34e4bf
DDAG		 2270 current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE;
2271 entered_postcopy = true;
2272 }
2273
2274 continue;
2275 }
2276 /* Just another iteration step */
89a02a9f 2277 qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy);
c369f40d 2278 } else {
09f6c85e 2279 trace_migration_thread_low_pending(pending_size);
64909f97 2280 migration_completion(s, current_active_state);
09f6c85e 2281 break;
c369f40d
JQ		 2282 }
2283 }
f4410a5d 2284
89a02a9f 2285 if (qemu_file_get_error(s->to_dst_file)) {
48781e5b
HZ		 2286 migrate_set_state(&s->state, current_active_state,
2287 MIGRATION_STATUS_FAILED);
1d34e4bf 2288 trace_migration_thread_file_err();
fd45ee2c
PB		 2289 break;
2290 }
bc72ad67 2291 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
0d82d0e8 2292 if (current_time >= initial_time + BUFFER_DELAY) {
89a02a9f
HZ		 2293 uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) -
2294 initial_bytes;
77417f10 2295 uint64_t time_spent = current_time - initial_time;
a694ee34 2296 double bandwidth = (double)transferred_bytes / time_spent;
faec066a 2297 threshold_size = bandwidth * s->parameters.downtime_limit;
0d82d0e8 2298
5b648de0
WY		 2299 s->mbps = (((double) transferred_bytes * 8.0) /
2300 ((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
7e114f8c 2301
9013dca5 2302 trace_migrate_transferred(transferred_bytes, time_spent,
faec066a 2303 bandwidth, threshold_size);
90f8ae72
JQ		 2304 /* if we haven't sent anything, we don't want to recalculate
2305 10000 is a small enough number for our purposes */
9360447d
JQ		 2306 if (ram_counters.dirty_pages_rate && transferred_bytes > 10000) {
2307 s->expected_downtime = ram_counters.dirty_pages_rate *
20afaed9 2308 qemu_target_page_size() / bandwidth;
90f8ae72 2309 }
0d82d0e8 2310
89a02a9f 2311 qemu_file_reset_rate_limit(s->to_dst_file);
0d82d0e8 2312 initial_time = current_time;
89a02a9f 2313 initial_bytes = qemu_ftell(s->to_dst_file);
0d82d0e8 2314 }
89a02a9f 2315 if (qemu_file_rate_limit(s->to_dst_file)) {
0d82d0e8
JQ		 2316 /* usleep expects microseconds */
2317 g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
2318 }
a3fa1d78
PB		 2319 }
2320
1d34e4bf 2321 trace_migration_thread_after_loop();
070afca2
JH		 2322 /* If we enabled cpu throttling for auto-converge, turn it off. */
2323 cpu_throttle_stop();
94f5a437 2324 end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
070afca2 2325
f4410a5d 2326 qemu_mutex_lock_iothread();
31194731 2327 if (s->state == MIGRATION_STATUS_COMPLETED) {
89a02a9f 2328 uint64_t transferred_bytes = qemu_ftell(s->to_dst_file);
4af246a3 2329 s->total_time = end_time - s->start_time;
1d34e4bf 2330 if (!entered_postcopy) {
64909f97 2331 s->downtime = end_time - s->downtime_start;
1d34e4bf 2332 }
d6ed7312
PL		 2333 if (s->total_time) {
2334 s->mbps = (((double) transferred_bytes * 8.0) /
2335 ((double) s->total_time)) / 1000;
2336 }
a3fa1d78
PB		 2337 runstate_set(RUN_STATE_POSTMIGRATE);
2338 } else {
0d649a0e
PX		 2339 if (s->state == MIGRATION_STATUS_ACTIVE) {
2340 /*
2341 * We should really assert here, but since it's during
2342 * migration, let's try to reduce the usage of assertions.
2343 */
deb74fb6 2344 if (!migrate_colo_enabled()) {
0d649a0e
PX		 2345 error_report("%s: critical error: calling COLO code without "
2346 "COLO enabled", __func__);
2347 }
0b827d5e 2348 migrate_start_colo_process(s);
0b827d5e
HZ		 2349 /*
2350 * Fixme: we will run VM in COLO no matter its old running state.
2351 * After exited COLO, we will keep running.
2352 */
7287cbd4 2353 s->vm_was_running = true;
0b827d5e 2354 }
7287cbd4 2355 if (s->vm_was_running) {
a3fa1d78 2356 vm_start();
42da5550
DDAG		 2357 } else {
2358 if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
2359 runstate_set(RUN_STATE_POSTMIGRATE);
2360 }
dba433c0 2361 }
0d82d0e8 2362 }
bb1fadc4 2363 qemu_bh_schedule(s->cleanup_bh);
dba433c0 2364 qemu_mutex_unlock_iothread();
f4410a5d 2365
ab28bd23 2366 rcu_unregister_thread();
0d82d0e8
JQ		 2367 return NULL;
2368}
2369
9848a404 2370void migrate_fd_connect(MigrationState *s)
0d82d0e8 2371{
2ff30257 2372 s->expected_downtime = s->parameters.downtime_limit;
bb1fadc4 2373 s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
0d82d0e8 2374
9e4d2b98 2375 qemu_file_set_blocking(s->to_dst_file, true);
89a02a9f 2376 qemu_file_set_rate_limit(s->to_dst_file,
2ff30257 2377 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
442773ce 2378
9287ac27
SH		 2379 /* Notify before starting migration thread */
2380 notifier_list_notify(&migration_state_notifiers, s);
2381
1d34e4bf 2382 /*
c788ada8
PX		 2383 * Open the return path. For postcopy, it is used exclusively. For
2384 * precopy, only if user specified "return-path" capability would
2385 * QEMU uses the return path.
1d34e4bf 2386 */
c788ada8 2387 if (migrate_postcopy_ram() || migrate_use_return_path()) {
1d34e4bf
DDAG		 2388 if (open_return_path_on_source(s)) {
2389 error_report("Unable to open return-path for postcopy");
48781e5b 2390 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1d34e4bf
DDAG		 2391 MIGRATION_STATUS_FAILED);
2392 migrate_fd_cleanup(s);
2393 return;
2394 }
2395 }
2396
f986c3d2
JQ		 2397 if (multifd_save_setup() != 0) {
2398 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
2399 MIGRATION_STATUS_FAILED);
2400 migrate_fd_cleanup(s);
2401 return;
2402 }
009fad7f 2403 qemu_thread_create(&s->thread, "live_migration", migration_thread, s,
bb1fadc4 2404 QEMU_THREAD_JOINABLE);
1d34e4bf 2405 s->migration_thread_running = true;
0d82d0e8 2406}
093e3c42 2407
9d18af93
PX		 2408void migration_global_dump(Monitor *mon)
2409{
2410 MigrationState *ms = migrate_get_current();
2411
6f0f6428
JQ		 2412 monitor_printf(mon, "globals:\n");
2413 monitor_printf(mon, "store-global-state: %s\n",
2414 ms->store_global_state ? "on" : "off");
2415 monitor_printf(mon, "only-migratable: %s\n",
2416 ms->only_migratable ? "on" : "off");
2417 monitor_printf(mon, "send-configuration: %s\n",
2418 ms->send_configuration ? "on" : "off");
2419 monitor_printf(mon, "send-section-footer: %s\n",
2420 ms->send_section_footer ? "on" : "off");
9d18af93
PX		 2421}
2422
20814758
PX		 2423#define DEFINE_PROP_MIG_CAP(name, x) \
2424 DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
2425
5272298c
PX		 2426static Property migration_properties[] = {
2427 DEFINE_PROP_BOOL("store-global-state", MigrationState,
2428 store_global_state, true),
3df663e5 2429 DEFINE_PROP_BOOL("only-migratable", MigrationState, only_migratable, false),
71dd4c1a
PX		 2430 DEFINE_PROP_BOOL("send-configuration", MigrationState,
2431 send_configuration, true),
15c38503
PX		 2432 DEFINE_PROP_BOOL("send-section-footer", MigrationState,
2433 send_section_footer, true),
89632faf
PX		 2434
2435 /* Migration parameters */
741d4086 2436 DEFINE_PROP_UINT8("x-compress-level", MigrationState,
89632faf
PX		 2437 parameters.compress_level,
2438 DEFAULT_MIGRATE_COMPRESS_LEVEL),
741d4086 2439 DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
89632faf
PX		 2440 parameters.compress_threads,
2441 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
741d4086 2442 DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
89632faf
PX		 2443 parameters.decompress_threads,
2444 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
741d4086 2445 DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
89632faf
PX		 2446 parameters.cpu_throttle_initial,
2447 DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
741d4086 2448 DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
89632faf
PX		 2449 parameters.cpu_throttle_increment,
2450 DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
741d4086 2451 DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
89632faf 2452 parameters.max_bandwidth, MAX_THROTTLE),
741d4086 2453 DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
89632faf
PX		 2454 parameters.downtime_limit,
2455 DEFAULT_MIGRATE_SET_DOWNTIME),
741d4086 2456 DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
89632faf
PX		 2457 parameters.x_checkpoint_delay,
2458 DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
741d4086 2459 DEFINE_PROP_UINT8("x-multifd-channels", MigrationState,
4075fb1c
JQ		 2460 parameters.x_multifd_channels,
2461 DEFAULT_MIGRATE_MULTIFD_CHANNELS),
741d4086 2462 DEFINE_PROP_UINT32("x-multifd-page-count", MigrationState,
0fb86605
JQ		 2463 parameters.x_multifd_page_count,
2464 DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT),
73af8dd8
JQ		 2465 DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
2466 parameters.xbzrle_cache_size,
2467 DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
20814758
PX		 2468
2469 /* Migration capabilities */
2470 DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
2471 DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
2472 DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
2473 DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
2474 DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
2475 DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
2476 DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
2477 DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
2478 DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
2479 DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
2480 DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
30126bbf 2481 DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_X_MULTIFD),
20814758 2482
5272298c
PX		 2483 DEFINE_PROP_END_OF_LIST(),
2484};
2485
e5cb7e76
PX		 2486static void migration_class_init(ObjectClass *klass, void *data)
2487{
2488 DeviceClass *dc = DEVICE_CLASS(klass);
2489
2490 dc->user_creatable = false;
5272298c 2491 dc->props = migration_properties;
e5cb7e76
PX		 2492}
2493
b91bf5e4
MAL		 2494static void migration_instance_finalize(Object *obj)
2495{
2496 MigrationState *ms = MIGRATION_OBJ(obj);
2497 MigrationParameters *params = &ms->parameters;
2498
87db1a7d 2499 qemu_mutex_destroy(&ms->error_mutex);
b91bf5e4
MAL		 2500 g_free(params->tls_hostname);
2501 g_free(params->tls_creds);
e91d8951 2502 qemu_sem_destroy(&ms->pause_sem);
b91bf5e4
MAL		 2503}
2504
e5cb7e76
PX		 2505static void migration_instance_init(Object *obj)
2506{
2507 MigrationState *ms = MIGRATION_OBJ(obj);
8b0b29dc 2508 MigrationParameters *params = &ms->parameters;
e5cb7e76
PX		 2509
2510 ms->state = MIGRATION_STATUS_NONE;
e5cb7e76 2511 ms->mbps = -1;
e91d8951 2512 qemu_sem_init(&ms->pause_sem, 0);
87db1a7d 2513 qemu_mutex_init(&ms->error_mutex);
8b0b29dc
PX		 2514
2515 params->tls_hostname = g_strdup("");
2516 params->tls_creds = g_strdup("");
2517
2518 /* Set has_* up only for parameter checks */
2519 params->has_compress_level = true;
2520 params->has_compress_threads = true;
2521 params->has_decompress_threads = true;
2522 params->has_cpu_throttle_initial = true;
2523 params->has_cpu_throttle_increment = true;
2524 params->has_max_bandwidth = true;
2525 params->has_downtime_limit = true;
2526 params->has_x_checkpoint_delay = true;
2527 params->has_block_incremental = true;
4075fb1c 2528 params->has_x_multifd_channels = true;
0fb86605 2529 params->has_x_multifd_page_count = true;
73af8dd8 2530 params->has_xbzrle_cache_size = true;
8b0b29dc
PX		 2531}
2532
2533/*
2534 * Return true if check pass, false otherwise. Error will be put
2535 * inside errp if provided.
2536 */
2537static bool migration_object_check(MigrationState *ms, Error **errp)
2538{
6b19a7d9
PX		 2539 MigrationCapabilityStatusList *head = NULL;
2540 /* Assuming all off */
2541 bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret;
2542 int i;
2543
8b0b29dc
PX		 2544 if (!migrate_params_check(&ms->parameters, errp)) {
2545 return false;
2546 }
2547
6b19a7d9
PX		 2548 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
2549 if (ms->enabled_capabilities[i]) {
2550 head = migrate_cap_add(head, i, true);
2551 }
2552 }
2553
2554 ret = migrate_caps_check(cap_list, head, errp);
2555
2556 /* It works with head == NULL */
2557 qapi_free_MigrationCapabilityStatusList(head);
2558
2559 return ret;
e5cb7e76
PX		 2560}
2561
2562static const TypeInfo migration_type = {
2563 .name = TYPE_MIGRATION,
01f6e14c 2564 /*
c8d3ff38
PX		 2565 * NOTE: TYPE_MIGRATION is not really a device, as the object is
2566 * not created using qdev_create(), it is not attached to the qdev
2567 * device tree, and it is never realized.
2568 *
2569 * TODO: Make this TYPE_OBJECT once QOM provides something like
2570 * TYPE_DEVICE's "-global" properties.
01f6e14c 2571 */
e5cb7e76
PX		 2572 .parent = TYPE_DEVICE,
2573 .class_init = migration_class_init,
2574 .class_size = sizeof(MigrationClass),
2575 .instance_size = sizeof(MigrationState),
2576 .instance_init = migration_instance_init,
b91bf5e4 2577 .instance_finalize = migration_instance_finalize,
e5cb7e76
PX		 2578};
2579
2580static void register_migration_types(void)
2581{
2582 type_register_static(&migration_type);
2583}
2584
2585type_init(register_migration_types);
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