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Drop superfluous includes of qapi-types.h and test-qapi-types.h
[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
ee86981b 599MigrationInfo *qmp_query_migrate(Error **errp)
5bb7910a 600{
ee86981b 601 MigrationInfo *info = g_malloc0(sizeof(*info));
17549e84
JQ		 602 MigrationState *s = migrate_get_current();
603
604 switch (s->state) {
31194731 605 case MIGRATION_STATUS_NONE:
17549e84
JQ		 606 /* no migration has happened ever */
607 break;
31194731 608 case MIGRATION_STATUS_SETUP:
29ae8a41 609 info->has_status = true;
ed4fbd10 610 info->has_total_time = false;
29ae8a41 611 break;
31194731
HZ		 612 case MIGRATION_STATUS_ACTIVE:
613 case MIGRATION_STATUS_CANCELLING:
9ec055ae 614 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
31e06077
DDAG		 615 case MIGRATION_STATUS_PRE_SWITCHOVER:
616 case MIGRATION_STATUS_DEVICE:
c8f9f4f4 617 /* TODO add some postcopy stats */
9ec055ae
DDAG		 618 info->has_status = true;
619 info->has_total_time = true;
620 info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
4af246a3 621 - s->start_time;
9ec055ae
DDAG		 622 info->has_expected_downtime = true;
623 info->expected_downtime = s->expected_downtime;
624 info->has_setup_time = true;
625 info->setup_time = s->setup_time;
626
a22463a5 627 populate_ram_info(info, s);
930ac04c 628 populate_disk_info(info);
17549e84 629 break;
0b827d5e
HZ		 630 case MIGRATION_STATUS_COLO:
631 info->has_status = true;
632 /* TODO: display COLO specific information (checkpoint info etc.) */
633 break;
31194731 634 case MIGRATION_STATUS_COMPLETED:
791e7c82 635 info->has_status = true;
00c14997 636 info->has_total_time = true;
7aa939af 637 info->total_time = s->total_time;
9c5a9fcf
JQ		 638 info->has_downtime = true;
639 info->downtime = s->downtime;
ed4fbd10
MH		 640 info->has_setup_time = true;
641 info->setup_time = s->setup_time;
d5f8a570 642
a22463a5 643 populate_ram_info(info, s);
17549e84 644 break;
31194731 645 case MIGRATION_STATUS_FAILED:
791e7c82 646 info->has_status = true;
d59ce6f3
DB		 647 if (s->error) {
648 info->has_error_desc = true;
649 info->error_desc = g_strdup(error_get_pretty(s->error));
650 }
17549e84 651 break;
31194731 652 case MIGRATION_STATUS_CANCELLED:
791e7c82 653 info->has_status = true;
17549e84 654 break;
5bb7910a 655 }
cde63fbe 656 info->status = s->state;
ee86981b
PM		 657
658 return info;
5bb7910a
AL		 659}
660
4a84214e
PX		 661/**
662 * @migration_caps_check - check capability validity
663 *
664 * @cap_list: old capability list, array of bool
665 * @params: new capabilities to be applied soon
666 * @errp: set *errp if the check failed, with reason
667 *
668 * Returns true if check passed, otherwise false.
669 */
670static bool migrate_caps_check(bool *cap_list,
671 MigrationCapabilityStatusList *params,
672 Error **errp)
00458433 673{
00458433 674 MigrationCapabilityStatusList *cap;
4a84214e 675 bool old_postcopy_cap;
d7651f15 676 MigrationIncomingState *mis = migration_incoming_get_current();
00458433 677
4a84214e 678 old_postcopy_cap = cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM];
00458433
OW		 679
680 for (cap = params; cap; cap = cap->next) {
4a84214e
PX		 681 cap_list[cap->value->capability] = cap->value->state;
682 }
683
ed1701c6 684#ifndef CONFIG_LIVE_BLOCK_MIGRATION
4a84214e
PX		 685 if (cap_list[MIGRATION_CAPABILITY_BLOCK]) {
686 error_setg(errp, "QEMU compiled without old-style (blk/-b, inc/-i) "
687 "block migration");
688 error_append_hint(errp, "Use drive_mirror+NBD instead.\n");
689 return false;
00458433 690 }
4a84214e 691#endif
53dd370c 692
4a84214e
PX		 693 if (cap_list[MIGRATION_CAPABILITY_POSTCOPY_RAM]) {
694 if (cap_list[MIGRATION_CAPABILITY_COMPRESS]) {
53dd370c
DDAG		 695 /* The decompression threads asynchronously write into RAM
696 * rather than use the atomic copies needed to avoid
697 * userfaulting. It should be possible to fix the decompression
698 * threads for compatibility in future.
699 */
4a84214e
PX		 700 error_setg(errp, "Postcopy is not currently compatible "
701 "with compression");
702 return false;
53dd370c 703 }
4a84214e 704
096631bd
DDAG		 705 /* This check is reasonably expensive, so only when it's being
706 * set the first time, also it's only the destination that needs
707 * special support.
708 */
709 if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) &&
d7651f15 710 !postcopy_ram_supported_by_host(mis)) {
096631bd
DDAG		 711 /* postcopy_ram_supported_by_host will have emitted a more
712 * detailed message
713 */
4a84214e
PX		 714 error_setg(errp, "Postcopy is not supported");
715 return false;
096631bd 716 }
53dd370c 717 }
4a84214e
PX		 718
719 return true;
720}
721
722void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
723 Error **errp)
724{
725 MigrationState *s = migrate_get_current();
726 MigrationCapabilityStatusList *cap;
727
728 if (migration_is_setup_or_active(s->state)) {
729 error_setg(errp, QERR_MIGRATION_ACTIVE);
730 return;
731 }
732
733 if (!migrate_caps_check(s->enabled_capabilities, params, errp)) {
734 return;
735 }
736
737 for (cap = params; cap; cap = cap->next) {
738 s->enabled_capabilities[cap->value->capability] = cap->value->state;
739 }
00458433
OW		 740}
741
16d063bc
PX		 742/*
743 * Check whether the parameters are valid. Error will be put into errp
744 * (if provided). Return true if valid, otherwise false.
745 */
746static bool migrate_params_check(MigrationParameters *params, Error **errp)
85de8323 747{
7f375e04 748 if (params->has_compress_level &&
741d4086 749 (params->compress_level > 9)) {
c6bd8c70
MA		 750 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
751 "is invalid, it should be in the range of 0 to 9");
16d063bc 752 return false;
85de8323 753 }
16d063bc 754
741d4086 755 if (params->has_compress_threads && (params->compress_threads < 1)) {
c6bd8c70
MA		 756 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
757 "compress_threads",
758 "is invalid, it should be in the range of 1 to 255");
16d063bc 759 return false;
85de8323 760 }
16d063bc 761
741d4086 762 if (params->has_decompress_threads && (params->decompress_threads < 1)) {
c6bd8c70
MA		 763 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
764 "decompress_threads",
765 "is invalid, it should be in the range of 1 to 255");
16d063bc 766 return false;
85de8323 767 }
16d063bc 768
7f375e04
EB		 769 if (params->has_cpu_throttle_initial &&
770 (params->cpu_throttle_initial < 1 ||
771 params->cpu_throttle_initial > 99)) {
1626fee3 772 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
d85a31d1 773 "cpu_throttle_initial",
1626fee3 774 "an integer in the range of 1 to 99");
16d063bc 775 return false;
1626fee3 776 }
16d063bc 777
7f375e04
EB		 778 if (params->has_cpu_throttle_increment &&
779 (params->cpu_throttle_increment < 1 ||
780 params->cpu_throttle_increment > 99)) {
1626fee3 781 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
d85a31d1 782 "cpu_throttle_increment",
1626fee3 783 "an integer in the range of 1 to 99");
16d063bc 784 return false;
1626fee3 785 }
16d063bc 786
741d4086 787 if (params->has_max_bandwidth && (params->max_bandwidth > SIZE_MAX)) {
2ff30257
AA		 788 error_setg(errp, "Parameter 'max_bandwidth' expects an integer in the"
789 " range of 0 to %zu bytes/second", SIZE_MAX);
16d063bc 790 return false;
2ff30257 791 }
16d063bc 792
2ff30257 793 if (params->has_downtime_limit &&
741d4086 794 (params->downtime_limit > MAX_MIGRATE_DOWNTIME)) {
87c9cc1c
DHB		 795 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
796 "the range of 0 to %d milliseconds",
797 MAX_MIGRATE_DOWNTIME);
16d063bc 798 return false;
2ff30257 799 }
16d063bc 800
741d4086
JQ		 801 /* x_checkpoint_delay is now always positive */
802
803 if (params->has_x_multifd_channels && (params->x_multifd_channels < 1)) {
4075fb1c
JQ		 804 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
805 "multifd_channels",
806 "is invalid, it should be in the range of 1 to 255");
807 return false;
808 }
0fb86605 809 if (params->has_x_multifd_page_count &&
741d4086
JQ		 810 (params->x_multifd_page_count < 1 ||
811 params->x_multifd_page_count > 10000)) {
0fb86605
JQ		 812 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
813 "multifd_page_count",
814 "is invalid, it should be in the range of 1 to 10000");
815 return false;
816 }
16d063bc 817
73af8dd8
JQ		 818 if (params->has_xbzrle_cache_size &&
819 (params->xbzrle_cache_size < qemu_target_page_size() ||
820 !is_power_of_2(params->xbzrle_cache_size))) {
821 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
822 "xbzrle_cache_size",
823 "is invalid, it should be bigger than target page size"
824 " and a power of two");
825 return false;
826 }
827
16d063bc
PX		 828 return true;
829}
830
1bda8b3c
MA		 831static void migrate_params_test_apply(MigrateSetParameters *params,
832 MigrationParameters *dest)
833{
834 *dest = migrate_get_current()->parameters;
835
836 /* TODO use QAPI_CLONE() instead of duplicating it inline */
837
838 if (params->has_compress_level) {
839 dest->compress_level = params->compress_level;
840 }
841
842 if (params->has_compress_threads) {
843 dest->compress_threads = params->compress_threads;
844 }
845
846 if (params->has_decompress_threads) {
847 dest->decompress_threads = params->decompress_threads;
848 }
849
850 if (params->has_cpu_throttle_initial) {
851 dest->cpu_throttle_initial = params->cpu_throttle_initial;
852 }
853
854 if (params->has_cpu_throttle_increment) {
855 dest->cpu_throttle_increment = params->cpu_throttle_increment;
856 }
857
858 if (params->has_tls_creds) {
01fa5598
MA		 859 assert(params->tls_creds->type == QTYPE_QSTRING);
860 dest->tls_creds = g_strdup(params->tls_creds->u.s);
1bda8b3c
MA		 861 }
862
863 if (params->has_tls_hostname) {
01fa5598
MA		 864 assert(params->tls_hostname->type == QTYPE_QSTRING);
865 dest->tls_hostname = g_strdup(params->tls_hostname->u.s);
1bda8b3c
MA		 866 }
867
868 if (params->has_max_bandwidth) {
869 dest->max_bandwidth = params->max_bandwidth;
870 }
871
872 if (params->has_downtime_limit) {
873 dest->downtime_limit = params->downtime_limit;
874 }
875
876 if (params->has_x_checkpoint_delay) {
877 dest->x_checkpoint_delay = params->x_checkpoint_delay;
878 }
879
880 if (params->has_block_incremental) {
881 dest->block_incremental = params->block_incremental;
882 }
5e7577a1
JQ		 883 if (params->has_x_multifd_channels) {
884 dest->x_multifd_channels = params->x_multifd_channels;
885 }
886 if (params->has_x_multifd_page_count) {
887 dest->x_multifd_page_count = params->x_multifd_page_count;
888 }
73af8dd8
JQ		 889 if (params->has_xbzrle_cache_size) {
890 dest->xbzrle_cache_size = params->xbzrle_cache_size;
891 }
1bda8b3c
MA		 892}
893
73af8dd8 894static void migrate_params_apply(MigrateSetParameters *params, Error **errp)
16d063bc
PX		 895{
896 MigrationState *s = migrate_get_current();
897
e87fae4c
MA		 898 /* TODO use QAPI_CLONE() instead of duplicating it inline */
899
7f375e04
EB		 900 if (params->has_compress_level) {
901 s->parameters.compress_level = params->compress_level;
85de8323 902 }
476c72aa 903
7f375e04
EB		 904 if (params->has_compress_threads) {
905 s->parameters.compress_threads = params->compress_threads;
85de8323 906 }
476c72aa 907
7f375e04
EB		 908 if (params->has_decompress_threads) {
909 s->parameters.decompress_threads = params->decompress_threads;
85de8323 910 }
476c72aa 911
7f375e04
EB		 912 if (params->has_cpu_throttle_initial) {
913 s->parameters.cpu_throttle_initial = params->cpu_throttle_initial;
1626fee3 914 }
476c72aa 915
7f375e04
EB		 916 if (params->has_cpu_throttle_increment) {
917 s->parameters.cpu_throttle_increment = params->cpu_throttle_increment;
1626fee3 918 }
476c72aa 919
7f375e04 920 if (params->has_tls_creds) {
69ef1f36 921 g_free(s->parameters.tls_creds);
01fa5598
MA		 922 assert(params->tls_creds->type == QTYPE_QSTRING);
923 s->parameters.tls_creds = g_strdup(params->tls_creds->u.s);
69ef1f36 924 }
476c72aa 925
7f375e04 926 if (params->has_tls_hostname) {
69ef1f36 927 g_free(s->parameters.tls_hostname);
01fa5598
MA		 928 assert(params->tls_hostname->type == QTYPE_QSTRING);
929 s->parameters.tls_hostname = g_strdup(params->tls_hostname->u.s);
69ef1f36 930 }
476c72aa 931
2ff30257
AA		 932 if (params->has_max_bandwidth) {
933 s->parameters.max_bandwidth = params->max_bandwidth;
934 if (s->to_dst_file) {
935 qemu_file_set_rate_limit(s->to_dst_file,
936 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
937 }
938 }
476c72aa 939
2ff30257
AA		 940 if (params->has_downtime_limit) {
941 s->parameters.downtime_limit = params->downtime_limit;
942 }
68b53591
HZ		 943
944 if (params->has_x_checkpoint_delay) {
945 s->parameters.x_checkpoint_delay = params->x_checkpoint_delay;
479125d5
HZ		 946 if (migration_in_colo_state()) {
947 colo_checkpoint_notify(s);
948 }
68b53591 949 }
476c72aa 950
2833c59b
JQ		 951 if (params->has_block_incremental) {
952 s->parameters.block_incremental = params->block_incremental;
953 }
4075fb1c
JQ		 954 if (params->has_x_multifd_channels) {
955 s->parameters.x_multifd_channels = params->x_multifd_channels;
956 }
0fb86605
JQ		 957 if (params->has_x_multifd_page_count) {
958 s->parameters.x_multifd_page_count = params->x_multifd_page_count;
959 }
73af8dd8
JQ		 960 if (params->has_xbzrle_cache_size) {
961 s->parameters.xbzrle_cache_size = params->xbzrle_cache_size;
962 xbzrle_cache_resize(params->xbzrle_cache_size, errp);
963 }
85de8323
LL		 964}
965
1bda8b3c 966void qmp_migrate_set_parameters(MigrateSetParameters *params, Error **errp)
476c72aa 967{
1bda8b3c
MA		 968 MigrationParameters tmp;
969
01fa5598
MA		 970 /* TODO Rewrite "" to null instead */
971 if (params->has_tls_creds
972 && params->tls_creds->type == QTYPE_QNULL) {
973 QDECREF(params->tls_creds->u.n);
974 params->tls_creds->type = QTYPE_QSTRING;
975 params->tls_creds->u.s = strdup("");
976 }
977 /* TODO Rewrite "" to null instead */
978 if (params->has_tls_hostname
979 && params->tls_hostname->type == QTYPE_QNULL) {
980 QDECREF(params->tls_hostname->u.n);
981 params->tls_hostname->type = QTYPE_QSTRING;
982 params->tls_hostname->u.s = strdup("");
983 }
984
1bda8b3c
MA		 985 migrate_params_test_apply(params, &tmp);
986
987 if (!migrate_params_check(&tmp, errp)) {
476c72aa
PX		 988 /* Invalid parameter */
989 return;
990 }
991
73af8dd8 992 migrate_params_apply(params, errp);
476c72aa
PX		 993}
994
2594f56d 995
4886a1bc
DDAG		 996void qmp_migrate_start_postcopy(Error **errp)
997{
998 MigrationState *s = migrate_get_current();
999
1000 if (!migrate_postcopy_ram()) {
a54d340b 1001 error_setg(errp, "Enable postcopy with migrate_set_capability before"
4886a1bc
DDAG		 1002 " the start of migration");
1003 return;
1004 }
1005
1006 if (s->state == MIGRATION_STATUS_NONE) {
1007 error_setg(errp, "Postcopy must be started after migration has been"
1008 " started");
1009 return;
1010 }
1011 /*
1012 * we don't error if migration has finished since that would be racy
1013 * with issuing this command.
1014 */
1015 atomic_set(&s->start_postcopy, true);
1016}
1017
065e2813
AL		 1018/* shared migration helpers */
1019
48781e5b 1020void migrate_set_state(int *state, int old_state, int new_state)
51cf4c1a 1021{
a31fedee 1022 assert(new_state < MIGRATION_STATUS__MAX);
48781e5b 1023 if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
a31fedee 1024 trace_migrate_set_state(MigrationStatus_str(new_state));
b05dc723 1025 migrate_generate_event(new_state);
51cf4c1a
Z		 1026 }
1027}
1028
4e4a3d3a
PX		 1029static MigrationCapabilityStatusList *migrate_cap_add(
1030 MigrationCapabilityStatusList *list,
1031 MigrationCapability index,
1032 bool state)
2833c59b
JQ		 1033{
1034 MigrationCapabilityStatusList *cap;
1035
1036 cap = g_new0(MigrationCapabilityStatusList, 1);
1037 cap->value = g_new0(MigrationCapabilityStatus, 1);
4e4a3d3a
PX		 1038 cap->value->capability = index;
1039 cap->value->state = state;
1040 cap->next = list;
1041
1042 return cap;
1043}
1044
1045void migrate_set_block_enabled(bool value, Error **errp)
1046{
1047 MigrationCapabilityStatusList *cap;
1048
1049 cap = migrate_cap_add(NULL, MIGRATION_CAPABILITY_BLOCK, value);
2833c59b
JQ		 1050 qmp_migrate_set_capabilities(cap, errp);
1051 qapi_free_MigrationCapabilityStatusList(cap);
1052}
1053
1054static void migrate_set_block_incremental(MigrationState *s, bool value)
1055{
1056 s->parameters.block_incremental = value;
1057}
1058
1059static void block_cleanup_parameters(MigrationState *s)
1060{
1061 if (s->must_remove_block_options) {
1062 /* setting to false can never fail */
1063 migrate_set_block_enabled(false, &error_abort);
1064 migrate_set_block_incremental(s, false);
1065 s->must_remove_block_options = false;
1066 }
1067}
1068
bb1fadc4 1069static void migrate_fd_cleanup(void *opaque)
065e2813 1070{
bb1fadc4
PB		 1071 MigrationState *s = opaque;
1072
1073 qemu_bh_delete(s->cleanup_bh);
1074 s->cleanup_bh = NULL;
1075
0ceccd85
PX		 1076 qemu_savevm_state_cleanup();
1077
89a02a9f 1078 if (s->to_dst_file) {
f986c3d2
JQ		 1079 Error *local_err = NULL;
1080
9013dca5 1081 trace_migrate_fd_cleanup();
404a7c05 1082 qemu_mutex_unlock_iothread();
1d34e4bf
DDAG		 1083 if (s->migration_thread_running) {
1084 qemu_thread_join(&s->thread);
1085 s->migration_thread_running = false;
1086 }
404a7c05
PB		 1087 qemu_mutex_lock_iothread();
1088
f986c3d2
JQ		 1089 if (multifd_save_cleanup(&local_err) != 0) {
1090 error_report_err(local_err);
1091 }
89a02a9f
HZ		 1092 qemu_fclose(s->to_dst_file);
1093 s->to_dst_file = NULL;
065e2813
AL		 1094 }
1095
9ec055ae
DDAG		 1096 assert((s->state != MIGRATION_STATUS_ACTIVE) &&
1097 (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE));
7a2c1721 1098
94f5a437 1099 if (s->state == MIGRATION_STATUS_CANCELLING) {
48781e5b 1100 migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING,
94f5a437 1101 MIGRATION_STATUS_CANCELLED);
7a2c1721 1102 }
a3fa1d78 1103
87db1a7d
JQ		 1104 if (s->error) {
1105 /* It is used on info migrate. We can't free it */
1106 error_report_err(error_copy(s->error));
1107 }
a3fa1d78 1108 notifier_list_notify(&migration_state_notifiers, s);
2833c59b 1109 block_cleanup_parameters(s);
065e2813
AL		 1110}
1111
87db1a7d
JQ		 1112void migrate_set_error(MigrationState *s, const Error *error)
1113{
1114 qemu_mutex_lock(&s->error_mutex);
1115 if (!s->error) {
1116 s->error = error_copy(error);
1117 }
1118 qemu_mutex_unlock(&s->error_mutex);
1119}
1120
d59ce6f3 1121void migrate_fd_error(MigrationState *s, const Error *error)
065e2813 1122{
25174055 1123 trace_migrate_fd_error(error_get_pretty(error));
89a02a9f 1124 assert(s->to_dst_file == NULL);
48781e5b
HZ		 1125 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1126 MIGRATION_STATUS_FAILED);
87db1a7d 1127 migrate_set_error(s, error);
458cf28e
JQ		 1128}
1129
0edda1c4 1130static void migrate_fd_cancel(MigrationState *s)
065e2813 1131{
6f2b811a 1132 int old_state ;
89a02a9f 1133 QEMUFile *f = migrate_get_current()->to_dst_file;
9013dca5 1134 trace_migrate_fd_cancel();
065e2813 1135
70b20477
DDAG		 1136 if (s->rp_state.from_dst_file) {
1137 /* shutdown the rp socket, so causing the rp thread to shutdown */
1138 qemu_file_shutdown(s->rp_state.from_dst_file);
1139 }
1140
6f2b811a
Z		 1141 do {
1142 old_state = s->state;
f6844b99 1143 if (!migration_is_setup_or_active(old_state)) {
6f2b811a
Z		 1144 break;
1145 }
a7b36b48
DDAG		 1146 /* If the migration is paused, kick it out of the pause */
1147 if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) {
1148 qemu_sem_post(&s->pause_sem);
1149 }
48781e5b 1150 migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
31194731 1151 } while (s->state != MIGRATION_STATUS_CANCELLING);
a26ba26e
DDAG		 1152
1153 /*
1154 * If we're unlucky the migration code might be stuck somewhere in a
1155 * send/write while the network has failed and is waiting to timeout;
1156 * if we've got shutdown(2) available then we can force it to quit.
1157 * The outgoing qemu file gets closed in migrate_fd_cleanup that is
1158 * called in a bh, so there is no race against this cancel.
1159 */
31194731 1160 if (s->state == MIGRATION_STATUS_CANCELLING && f) {
a26ba26e
DDAG		 1161 qemu_file_shutdown(f);
1162 }
1d2acc31
HZ		 1163 if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) {
1164 Error *local_err = NULL;
1165
1166 bdrv_invalidate_cache_all(&local_err);
1167 if (local_err) {
1168 error_report_err(local_err);
1169 } else {
1170 s->block_inactive = false;
1171 }
1172 }
065e2813
AL		 1173}
1174
99a0db9b
GH		 1175void add_migration_state_change_notifier(Notifier *notify)
1176{
1177 notifier_list_add(&migration_state_notifiers, notify);
1178}
1179
1180void remove_migration_state_change_notifier(Notifier *notify)
1181{
31552529 1182 notifier_remove(notify);
99a0db9b
GH		 1183}
1184
02edd2e7 1185bool migration_in_setup(MigrationState *s)
afe2df69 1186{
31194731 1187 return s->state == MIGRATION_STATUS_SETUP;
afe2df69
GH		 1188}
1189
7073693b 1190bool migration_has_finished(MigrationState *s)
99a0db9b 1191{
31194731 1192 return s->state == MIGRATION_STATUS_COMPLETED;
99a0db9b 1193}
0edda1c4 1194
afe2df69
GH		 1195bool migration_has_failed(MigrationState *s)
1196{
31194731
HZ		 1197 return (s->state == MIGRATION_STATUS_CANCELLED ||
1198 s->state == MIGRATION_STATUS_FAILED);
afe2df69
GH		 1199}
1200
5727309d 1201bool migration_in_postcopy(void)
9ec055ae 1202{
5727309d
JQ		 1203 MigrationState *s = migrate_get_current();
1204
9ec055ae
DDAG		 1205 return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
1206}
1207
b82fc321
DDAG		 1208bool migration_in_postcopy_after_devices(MigrationState *s)
1209{
5727309d 1210 return migration_in_postcopy() && s->postcopy_after_devices;
b82fc321
DDAG		 1211}
1212
fab35005 1213bool migration_is_idle(void)
fe44dc91 1214{
fab35005 1215 MigrationState *s = migrate_get_current();
fe44dc91
AA		 1216
1217 switch (s->state) {
1218 case MIGRATION_STATUS_NONE:
1219 case MIGRATION_STATUS_CANCELLED:
1220 case MIGRATION_STATUS_COMPLETED:
1221 case MIGRATION_STATUS_FAILED:
1222 return true;
1223 case MIGRATION_STATUS_SETUP:
1224 case MIGRATION_STATUS_CANCELLING:
1225 case MIGRATION_STATUS_ACTIVE:
1226 case MIGRATION_STATUS_POSTCOPY_ACTIVE:
1227 case MIGRATION_STATUS_COLO:
31e06077
DDAG		 1228 case MIGRATION_STATUS_PRE_SWITCHOVER:
1229 case MIGRATION_STATUS_DEVICE:
fe44dc91
AA		 1230 return false;
1231 case MIGRATION_STATUS__MAX:
1232 g_assert_not_reached();
1233 }
1234
1235 return false;
1236}
1237
a0762d9e 1238MigrationState *migrate_init(void)
0edda1c4 1239{
17549e84 1240 MigrationState *s = migrate_get_current();
bbf6da32 1241
389775d1
DDAG		 1242 /*
1243 * Reinitialise all migration state, except
1244 * parameters/capabilities that the user set, and
1245 * locks.
1246 */
1247 s->bytes_xfer = 0;
1248 s->xfer_limit = 0;
1249 s->cleanup_bh = 0;
89a02a9f 1250 s->to_dst_file = NULL;
389775d1 1251 s->state = MIGRATION_STATUS_NONE;
389775d1
DDAG		 1252 s->rp_state.from_dst_file = NULL;
1253 s->rp_state.error = false;
1254 s->mbps = 0.0;
1255 s->downtime = 0;
1256 s->expected_downtime = 0;
389775d1 1257 s->setup_time = 0;
389775d1 1258 s->start_postcopy = false;
b82fc321 1259 s->postcopy_after_devices = false;
389775d1 1260 s->migration_thread_running = false;
d59ce6f3
DB		 1261 error_free(s->error);
1262 s->error = NULL;
389775d1 1263
48781e5b 1264 migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
0edda1c4 1265
4af246a3
PX		 1266 s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
1267 s->total_time = 0;
7287cbd4 1268 s->vm_was_running = false;
b15df1ae
PX		 1269 s->iteration_initial_bytes = 0;
1270 s->threshold_size = 0;
0edda1c4
JQ		 1271 return s;
1272}
cab30143 1273
fa2756b7
AL		 1274static GSList *migration_blockers;
1275
fe44dc91 1276int migrate_add_blocker(Error *reason, Error **errp)
fa2756b7 1277{
3df663e5 1278 if (migrate_get_current()->only_migratable) {
b67b8c3a
AA		 1279 error_propagate(errp, error_copy(reason));
1280 error_prepend(errp, "disallowing migration blocker "
1281 "(--only_migratable) for: ");
1282 return -EACCES;
1283 }
1284
fab35005 1285 if (migration_is_idle()) {
fe44dc91
AA		 1286 migration_blockers = g_slist_prepend(migration_blockers, reason);
1287 return 0;
1288 }
1289
1290 error_propagate(errp, error_copy(reason));
1291 error_prepend(errp, "disallowing migration blocker (migration in "
1292 "progress) for: ");
1293 return -EBUSY;
fa2756b7
AL		 1294}
1295
1296void migrate_del_blocker(Error *reason)
1297{
1298 migration_blockers = g_slist_remove(migration_blockers, reason);
1299}
1300
bf1ae1f4
DDAG		 1301void qmp_migrate_incoming(const char *uri, Error **errp)
1302{
1303 Error *local_err = NULL;
4debb5f5 1304 static bool once = true;
bf1ae1f4
DDAG		 1305
1306 if (!deferred_incoming) {
4debb5f5 1307 error_setg(errp, "For use with '-incoming defer'");
bf1ae1f4
DDAG		 1308 return;
1309 }
4debb5f5
DDAG		 1310 if (!once) {
1311 error_setg(errp, "The incoming migration has already been started");
1312 }
bf1ae1f4
DDAG		 1313
1314 qemu_start_incoming_migration(uri, &local_err);
1315
1316 if (local_err) {
1317 error_propagate(errp, local_err);
1318 return;
1319 }
1320
4debb5f5 1321 once = false;
bf1ae1f4
DDAG		 1322}
1323
24f3902b
GK		 1324bool migration_is_blocked(Error **errp)
1325{
1326 if (qemu_savevm_state_blocked(errp)) {
1327 return true;
1328 }
1329
1330 if (migration_blockers) {
250561e1 1331 error_propagate(errp, error_copy(migration_blockers->data));
24f3902b
GK		 1332 return true;
1333 }
1334
1335 return false;
1336}
1337
e1c37d0e
LC		 1338void qmp_migrate(const char *uri, bool has_blk, bool blk,
1339 bool has_inc, bool inc, bool has_detach, bool detach,
1340 Error **errp)
cab30143 1341{
be7059cd 1342 Error *local_err = NULL;
17549e84 1343 MigrationState *s = migrate_get_current();
cab30143 1344 const char *p;
cab30143 1345
f6844b99 1346 if (migration_is_setup_or_active(s->state) ||
0b827d5e
HZ		 1347 s->state == MIGRATION_STATUS_CANCELLING ||
1348 s->state == MIGRATION_STATUS_COLO) {
c6bd8c70 1349 error_setg(errp, QERR_MIGRATION_ACTIVE);
e1c37d0e 1350 return;
cab30143 1351 }
ca99993a
DDAG		 1352 if (runstate_check(RUN_STATE_INMIGRATE)) {
1353 error_setg(errp, "Guest is waiting for an incoming migration");
1354 return;
1355 }
1356
24f3902b 1357 if (migration_is_blocked(errp)) {
e1c37d0e 1358 return;
fa2756b7
AL		 1359 }
1360
2833c59b
JQ		 1361 if ((has_blk && blk) || (has_inc && inc)) {
1362 if (migrate_use_block() || migrate_use_block_incremental()) {
1363 error_setg(errp, "Command options are incompatible with "
1364 "current migration capabilities");
1365 return;
1366 }
1367 migrate_set_block_enabled(true, &local_err);
1368 if (local_err) {
1369 error_propagate(errp, local_err);
1370 return;
1371 }
1372 s->must_remove_block_options = true;
1373 }
1374
1375 if (has_inc && inc) {
1376 migrate_set_block_incremental(s, true);
1377 }
1378
a0762d9e 1379 s = migrate_init();
cab30143
JQ		 1380
1381 if (strstart(uri, "tcp:", &p)) {
f37afb5a 1382 tcp_start_outgoing_migration(s, p, &local_err);
2da776db 1383#ifdef CONFIG_RDMA
41310c68 1384 } else if (strstart(uri, "rdma:", &p)) {
2da776db
MH		 1385 rdma_start_outgoing_migration(s, p, &local_err);
1386#endif
cab30143 1387 } else if (strstart(uri, "exec:", &p)) {
f37afb5a 1388 exec_start_outgoing_migration(s, p, &local_err);
cab30143 1389 } else if (strstart(uri, "unix:", &p)) {
f37afb5a 1390 unix_start_outgoing_migration(s, p, &local_err);
cab30143 1391 } else if (strstart(uri, "fd:", &p)) {
f37afb5a 1392 fd_start_outgoing_migration(s, p, &local_err);
99a0db9b 1393 } else {
c6bd8c70
MA		 1394 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
1395 "a valid migration protocol");
48781e5b
HZ		 1396 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1397 MIGRATION_STATUS_FAILED);
e1c37d0e 1398 return;
cab30143
JQ		 1399 }
1400
f37afb5a 1401 if (local_err) {
d59ce6f3 1402 migrate_fd_error(s, local_err);
f37afb5a 1403 error_propagate(errp, local_err);
e1c37d0e 1404 return;
1299c631 1405 }
cab30143
JQ		 1406}
1407
6cdedb07 1408void qmp_migrate_cancel(Error **errp)
cab30143 1409{
17549e84 1410 migrate_fd_cancel(migrate_get_current());
cab30143
JQ		 1411}
1412
89cfc02c
DDAG		 1413void qmp_migrate_continue(MigrationStatus state, Error **errp)
1414{
1415 MigrationState *s = migrate_get_current();
1416 if (s->state != state) {
1417 error_setg(errp, "Migration not in expected state: %s",
1418 MigrationStatus_str(s->state));
1419 return;
1420 }
1421 qemu_sem_post(&s->pause_sem);
1422}
1423
9e1ba4cc
OW		 1424void qmp_migrate_set_cache_size(int64_t value, Error **errp)
1425{
73af8dd8
JQ		 1426 MigrateSetParameters p = {
1427 .has_xbzrle_cache_size = true,
1428 .xbzrle_cache_size = value,
1429 };
c91e681a 1430
73af8dd8 1431 qmp_migrate_set_parameters(&p, errp);
9e1ba4cc
OW		 1432}
1433
1434int64_t qmp_query_migrate_cache_size(Error **errp)
1435{
1436 return migrate_xbzrle_cache_size();
1437}
1438
3dc85383 1439void qmp_migrate_set_speed(int64_t value, Error **errp)
cab30143 1440{
1bda8b3c 1441 MigrateSetParameters p = {
2ff30257
AA		 1442 .has_max_bandwidth = true,
1443 .max_bandwidth = value,
1444 };
cab30143 1445
2ff30257 1446 qmp_migrate_set_parameters(&p, errp);
cab30143
JQ		 1447}
1448
4f0a993b 1449void qmp_migrate_set_downtime(double value, Error **errp)
cab30143 1450{
87c9cc1c
DHB		 1451 if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) {
1452 error_setg(errp, "Parameter 'downtime_limit' expects an integer in "
1453 "the range of 0 to %d seconds",
1454 MAX_MIGRATE_DOWNTIME_SECONDS);
1455 return;
1456 }
1457
2ff30257
AA		 1458 value *= 1000; /* Convert to milliseconds */
1459 value = MAX(0, MIN(INT64_MAX, value));
1460
1bda8b3c 1461 MigrateSetParameters p = {
2ff30257
AA		 1462 .has_downtime_limit = true,
1463 .downtime_limit = value,
1464 };
1465
1466 qmp_migrate_set_parameters(&p, errp);
99a0db9b 1467}
17ad9b35 1468
53f09a10
PB		 1469bool migrate_release_ram(void)
1470{
1471 MigrationState *s;
1472
1473 s = migrate_get_current();
1474
1475 return s->enabled_capabilities[MIGRATION_CAPABILITY_RELEASE_RAM];
1476}
1477
53dd370c
DDAG		 1478bool migrate_postcopy_ram(void)
1479{
1480 MigrationState *s;
1481
1482 s = migrate_get_current();
1483
32c3db5b 1484 return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
53dd370c
DDAG		 1485}
1486
58110f0a
VSO		 1487bool migrate_postcopy(void)
1488{
1489 return migrate_postcopy_ram();
1490}
1491
bde1e2ec
CV		 1492bool migrate_auto_converge(void)
1493{
1494 MigrationState *s;
1495
1496 s = migrate_get_current();
1497
1498 return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
1499}
1500
323004a3
PL		 1501bool migrate_zero_blocks(void)
1502{
1503 MigrationState *s;
1504
1505 s = migrate_get_current();
1506
1507 return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
1508}
1509
8706d2d5
LL		 1510bool migrate_use_compression(void)
1511{
dde4e694
LL		 1512 MigrationState *s;
1513
1514 s = migrate_get_current();
1515
1516 return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
8706d2d5
LL		 1517}
1518
1519int migrate_compress_level(void)
1520{
1521 MigrationState *s;
1522
1523 s = migrate_get_current();
1524
2594f56d 1525 return s->parameters.compress_level;
8706d2d5
LL		 1526}
1527
1528int migrate_compress_threads(void)
1529{
1530 MigrationState *s;
1531
1532 s = migrate_get_current();
1533
2594f56d 1534 return s->parameters.compress_threads;
8706d2d5
LL		 1535}
1536
3fcb38c2
LL		 1537int migrate_decompress_threads(void)
1538{
1539 MigrationState *s;
1540
1541 s = migrate_get_current();
1542
2594f56d 1543 return s->parameters.decompress_threads;
3fcb38c2
LL		 1544}
1545
b05dc723
JQ		 1546bool migrate_use_events(void)
1547{
1548 MigrationState *s;
1549
1550 s = migrate_get_current();
1551
1552 return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
1553}
1554
30126bbf
JQ		 1555bool migrate_use_multifd(void)
1556{
1557 MigrationState *s;
1558
1559 s = migrate_get_current();
1560
1561 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_MULTIFD];
1562}
1563
93fbd031
DDAG		 1564bool migrate_pause_before_switchover(void)
1565{
1566 MigrationState *s;
1567
1568 s = migrate_get_current();
1569
1570 return s->enabled_capabilities[
1571 MIGRATION_CAPABILITY_PAUSE_BEFORE_SWITCHOVER];
1572}
1573
4075fb1c
JQ		 1574int migrate_multifd_channels(void)
1575{
1576 MigrationState *s;
1577
1578 s = migrate_get_current();
1579
1580 return s->parameters.x_multifd_channels;
1581}
1582
0fb86605
JQ		 1583int migrate_multifd_page_count(void)
1584{
1585 MigrationState *s;
1586
1587 s = migrate_get_current();
1588
1589 return s->parameters.x_multifd_page_count;
1590}
1591
17ad9b35
OW		 1592int migrate_use_xbzrle(void)
1593{
1594 MigrationState *s;
1595
1596 s = migrate_get_current();
1597
1598 return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
1599}
1600
1601int64_t migrate_xbzrle_cache_size(void)
1602{
1603 MigrationState *s;
1604
1605 s = migrate_get_current();
1606
73af8dd8 1607 return s->parameters.xbzrle_cache_size;
17ad9b35 1608}
0d82d0e8 1609
2833c59b
JQ		 1610bool migrate_use_block(void)
1611{
1612 MigrationState *s;
1613
1614 s = migrate_get_current();
1615
1616 return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK];
1617}
1618
c788ada8
PX		 1619bool migrate_use_return_path(void)
1620{
1621 MigrationState *s;
1622
1623 s = migrate_get_current();
1624
1625 return s->enabled_capabilities[MIGRATION_CAPABILITY_RETURN_PATH];
1626}
1627
2833c59b
JQ		 1628bool migrate_use_block_incremental(void)
1629{
1630 MigrationState *s;
1631
1632 s = migrate_get_current();
1633
1634 return s->parameters.block_incremental;
1635}
1636
70b20477
DDAG		 1637/* migration thread support */
1638/*
1639 * Something bad happened to the RP stream, mark an error
1640 * The caller shall print or trace something to indicate why
1641 */
1642static void mark_source_rp_bad(MigrationState *s)
1643{
1644 s->rp_state.error = true;
1645}
1646
1647static struct rp_cmd_args {
1648 ssize_t len; /* -1 = variable */
1649 const char *name;
1650} rp_cmd_args[] = {
1651 [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" },
1652 [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" },
1653 [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" },
1e2d90eb
DDAG		 1654 [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" },
1655 [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" },
70b20477
DDAG		 1656 [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" },
1657};
1658
1e2d90eb
DDAG		 1659/*
1660 * Process a request for pages received on the return path,
1661 * We're allowed to send more than requested (e.g. to round to our page size)
1662 * and we don't need to send pages that have already been sent.
1663 */
1664static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
1665 ram_addr_t start, size_t len)
1666{
6c595cde
DDAG		 1667 long our_host_ps = getpagesize();
1668
1e2d90eb 1669 trace_migrate_handle_rp_req_pages(rbname, start, len);
6c595cde
DDAG		 1670
1671 /*
1672 * Since we currently insist on matching page sizes, just sanity check
1673 * we're being asked for whole host pages.
1674 */
1675 if (start & (our_host_ps-1) ||
1676 (len & (our_host_ps-1))) {
1677 error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
1678 " len: %zd", __func__, start, len);
1679 mark_source_rp_bad(ms);
1680 return;
1681 }
1682
96506894 1683 if (ram_save_queue_pages(rbname, start, len)) {
6c595cde
DDAG		 1684 mark_source_rp_bad(ms);
1685 }
1e2d90eb
DDAG		 1686}
1687
70b20477
DDAG		 1688/*
1689 * Handles messages sent on the return path towards the source VM
1690 *
1691 */
1692static void *source_return_path_thread(void *opaque)
1693{
1694 MigrationState *ms = opaque;
1695 QEMUFile *rp = ms->rp_state.from_dst_file;
1696 uint16_t header_len, header_type;
568b01ca 1697 uint8_t buf[512];
70b20477 1698 uint32_t tmp32, sibling_error;
1e2d90eb
DDAG		 1699 ram_addr_t start = 0; /* =0 to silence warning */
1700 size_t len = 0, expected_len;
70b20477
DDAG		 1701 int res;
1702
1703 trace_source_return_path_thread_entry();
1704 while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
1705 migration_is_setup_or_active(ms->state)) {
1706 trace_source_return_path_thread_loop_top();
1707 header_type = qemu_get_be16(rp);
1708 header_len = qemu_get_be16(rp);
1709
1710 if (header_type >= MIG_RP_MSG_MAX ||
1711 header_type == MIG_RP_MSG_INVALID) {
1712 error_report("RP: Received invalid message 0x%04x length 0x%04x",
1713 header_type, header_len);
1714 mark_source_rp_bad(ms);
1715 goto out;
1716 }
1717
1718 if ((rp_cmd_args[header_type].len != -1 &&
1719 header_len != rp_cmd_args[header_type].len) ||
568b01ca 1720 header_len > sizeof(buf)) {
70b20477
DDAG		 1721 error_report("RP: Received '%s' message (0x%04x) with"
1722 "incorrect length %d expecting %zu",
1723 rp_cmd_args[header_type].name, header_type, header_len,
1724 (size_t)rp_cmd_args[header_type].len);
1725 mark_source_rp_bad(ms);
1726 goto out;
1727 }
1728
1729 /* We know we've got a valid header by this point */
1730 res = qemu_get_buffer(rp, buf, header_len);
1731 if (res != header_len) {
1732 error_report("RP: Failed reading data for message 0x%04x"
1733 " read %d expected %d",
1734 header_type, res, header_len);
1735 mark_source_rp_bad(ms);
1736 goto out;
1737 }
1738
1739 /* OK, we have the message and the data */
1740 switch (header_type) {
1741 case MIG_RP_MSG_SHUT:
4d885131 1742 sibling_error = ldl_be_p(buf);
70b20477
DDAG		 1743 trace_source_return_path_thread_shut(sibling_error);
1744 if (sibling_error) {
1745 error_report("RP: Sibling indicated error %d", sibling_error);
1746 mark_source_rp_bad(ms);
1747 }
1748 /*
1749 * We'll let the main thread deal with closing the RP
1750 * we could do a shutdown(2) on it, but we're the only user
1751 * anyway, so there's nothing gained.
1752 */
1753 goto out;
1754
1755 case MIG_RP_MSG_PONG:
4d885131 1756 tmp32 = ldl_be_p(buf);
70b20477
DDAG		 1757 trace_source_return_path_thread_pong(tmp32);
1758 break;
1759
1e2d90eb 1760 case MIG_RP_MSG_REQ_PAGES:
4d885131
PM		 1761 start = ldq_be_p(buf);
1762 len = ldl_be_p(buf + 8);
1e2d90eb
DDAG		 1763 migrate_handle_rp_req_pages(ms, NULL, start, len);
1764 break;
1765
1766 case MIG_RP_MSG_REQ_PAGES_ID:
1767 expected_len = 12 + 1; /* header + termination */
1768
1769 if (header_len >= expected_len) {
4d885131
PM		 1770 start = ldq_be_p(buf);
1771 len = ldl_be_p(buf + 8);
1e2d90eb
DDAG		 1772 /* Now we expect an idstr */
1773 tmp32 = buf[12]; /* Length of the following idstr */
1774 buf[13 + tmp32] = '\0';
1775 expected_len += tmp32;
1776 }
1777 if (header_len != expected_len) {
1778 error_report("RP: Req_Page_id with length %d expecting %zd",
1779 header_len, expected_len);
1780 mark_source_rp_bad(ms);
1781 goto out;
1782 }
1783 migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len);
1784 break;
1785
70b20477
DDAG		 1786 default:
1787 break;
1788 }
1789 }
5df5416e 1790 if (qemu_file_get_error(rp)) {
70b20477
DDAG		 1791 trace_source_return_path_thread_bad_end();
1792 mark_source_rp_bad(ms);
1793 }
1794
1795 trace_source_return_path_thread_end();
1796out:
1797 ms->rp_state.from_dst_file = NULL;
1798 qemu_fclose(rp);
1799 return NULL;
1800}
1801
70b20477
DDAG		 1802static int open_return_path_on_source(MigrationState *ms)
1803{
1804
89a02a9f 1805 ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file);
70b20477
DDAG		 1806 if (!ms->rp_state.from_dst_file) {
1807 return -1;
1808 }
1809
1810 trace_open_return_path_on_source();
1811 qemu_thread_create(&ms->rp_state.rp_thread, "return path",
1812 source_return_path_thread, ms, QEMU_THREAD_JOINABLE);
1813
1814 trace_open_return_path_on_source_continue();
1815
1816 return 0;
1817}
1818
70b20477
DDAG		 1819/* Returns 0 if the RP was ok, otherwise there was an error on the RP */
1820static int await_return_path_close_on_source(MigrationState *ms)
1821{
1822 /*
1823 * If this is a normal exit then the destination will send a SHUT and the
1824 * rp_thread will exit, however if there's an error we need to cause
1825 * it to exit.
1826 */
89a02a9f 1827 if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) {
70b20477
DDAG		 1828 /*
1829 * shutdown(2), if we have it, will cause it to unblock if it's stuck
1830 * waiting for the destination.
1831 */
1832 qemu_file_shutdown(ms->rp_state.from_dst_file);
1833 mark_source_rp_bad(ms);
1834 }
1835 trace_await_return_path_close_on_source_joining();
1836 qemu_thread_join(&ms->rp_state.rp_thread);
1837 trace_await_return_path_close_on_source_close();
1838 return ms->rp_state.error;
1839}
1840
1d34e4bf
DDAG		 1841/*
1842 * Switch from normal iteration to postcopy
1843 * Returns non-0 on error
1844 */
7287cbd4 1845static int postcopy_start(MigrationState *ms)
1d34e4bf
DDAG		 1846{
1847 int ret;
61b67d47
DB		 1848 QIOChannelBuffer *bioc;
1849 QEMUFile *fb;
1d34e4bf 1850 int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
ef8d6488 1851 bool restart_block = false;
0331c8ca
DDAG		 1852 int cur_state = MIGRATION_STATUS_ACTIVE;
1853 if (!migrate_pause_before_switchover()) {
1854 migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
1855 MIGRATION_STATUS_POSTCOPY_ACTIVE);
1856 }
1d34e4bf
DDAG		 1857
1858 trace_postcopy_start();
1859 qemu_mutex_lock_iothread();
1860 trace_postcopy_start_set_run();
1861
1862 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
1d34e4bf
DDAG		 1863 global_state_store();
1864 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
76b1c7fe
KW		 1865 if (ret < 0) {
1866 goto fail;
1867 }
1d34e4bf 1868
0331c8ca
DDAG		 1869 ret = migration_maybe_pause(ms, &cur_state,
1870 MIGRATION_STATUS_POSTCOPY_ACTIVE);
1871 if (ret < 0) {
1872 goto fail;
1873 }
1874
76b1c7fe 1875 ret = bdrv_inactivate_all();
1d34e4bf
DDAG		 1876 if (ret < 0) {
1877 goto fail;
1878 }
ef8d6488 1879 restart_block = true;
1d34e4bf 1880
1c0d249d
DDAG		 1881 /*
1882 * Cause any non-postcopiable, but iterative devices to
1883 * send out their final data.
1884 */
a1fbe750 1885 qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false);
1c0d249d 1886
1d34e4bf
DDAG		 1887 /*
1888 * in Finish migrate and with the io-lock held everything should
1889 * be quiet, but we've potentially still got dirty pages and we
1890 * need to tell the destination to throw any pages it's already received
1891 * that are dirty
1892 */
58110f0a
VSO		 1893 if (migrate_postcopy_ram()) {
1894 if (ram_postcopy_send_discard_bitmap(ms)) {
1895 error_report("postcopy send discard bitmap failed");
1896 goto fail;
1897 }
1d34e4bf
DDAG		 1898 }
1899
1900 /*
1901 * send rest of state - note things that are doing postcopy
1902 * will notice we're in POSTCOPY_ACTIVE and not actually
1903 * wrap their state up here
1904 */
89a02a9f 1905 qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
58110f0a
VSO		 1906 if (migrate_postcopy_ram()) {
1907 /* Ping just for debugging, helps line traces up */
1908 qemu_savevm_send_ping(ms->to_dst_file, 2);
1909 }
1d34e4bf
DDAG		 1910
1911 /*
1912 * While loading the device state we may trigger page transfer
1913 * requests and the fd must be free to process those, and thus
1914 * the destination must read the whole device state off the fd before
1915 * it starts processing it. Unfortunately the ad-hoc migration format
1916 * doesn't allow the destination to know the size to read without fully
1917 * parsing it through each devices load-state code (especially the open
1918 * coded devices that use get/put).
1919 * So we wrap the device state up in a package with a length at the start;
1920 * to do this we use a qemu_buf to hold the whole of the device state.
1921 */
61b67d47 1922 bioc = qio_channel_buffer_new(4096);
6f01f136 1923 qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer");
61b67d47
DB		 1924 fb = qemu_fopen_channel_output(QIO_CHANNEL(bioc));
1925 object_unref(OBJECT(bioc));
1d34e4bf 1926
c76201ab
DDAG		 1927 /*
1928 * Make sure the receiver can get incoming pages before we send the rest
1929 * of the state
1930 */
1931 qemu_savevm_send_postcopy_listen(fb);
1932
a1fbe750 1933 qemu_savevm_state_complete_precopy(fb, false, false);
58110f0a
VSO		 1934 if (migrate_postcopy_ram()) {
1935 qemu_savevm_send_ping(fb, 3);
1936 }
1d34e4bf
DDAG		 1937
1938 qemu_savevm_send_postcopy_run(fb);
1939
1940 /* <><> end of stuff going into the package */
1d34e4bf 1941
ef8d6488
DDAG		 1942 /* Last point of recovery; as soon as we send the package the destination
1943 * can open devices and potentially start running.
1944 * Lets just check again we've not got any errors.
1945 */
1946 ret = qemu_file_get_error(ms->to_dst_file);
1947 if (ret) {
1948 error_report("postcopy_start: Migration stream errored (pre package)");
1949 goto fail_closefb;
1950 }
1951
1952 restart_block = false;
1953
1d34e4bf 1954 /* Now send that blob */
61b67d47 1955 if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) {
1d34e4bf
DDAG		 1956 goto fail_closefb;
1957 }
1958 qemu_fclose(fb);
b82fc321
DDAG		 1959
1960 /* Send a notify to give a chance for anything that needs to happen
1961 * at the transition to postcopy and after the device state; in particular
1962 * spice needs to trigger a transition now
1963 */
1964 ms->postcopy_after_devices = true;
1965 notifier_list_notify(&migration_state_notifiers, ms);
1966
1d34e4bf
DDAG		 1967 ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop;
1968
1969 qemu_mutex_unlock_iothread();
1970
58110f0a
VSO		 1971 if (migrate_postcopy_ram()) {
1972 /*
1973 * Although this ping is just for debug, it could potentially be
1974 * used for getting a better measurement of downtime at the source.
1975 */
1976 qemu_savevm_send_ping(ms->to_dst_file, 4);
1977 }
1d34e4bf 1978
ced1c616
PB		 1979 if (migrate_release_ram()) {
1980 ram_postcopy_migrated_memory_release(ms);
1981 }
1982
89a02a9f 1983 ret = qemu_file_get_error(ms->to_dst_file);
1d34e4bf
DDAG		 1984 if (ret) {
1985 error_report("postcopy_start: Migration stream errored");
48781e5b 1986 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
1d34e4bf
DDAG		 1987 MIGRATION_STATUS_FAILED);
1988 }
1989
1990 return ret;
1991
1992fail_closefb:
1993 qemu_fclose(fb);
1994fail:
48781e5b 1995 migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
1d34e4bf 1996 MIGRATION_STATUS_FAILED);
ef8d6488
DDAG		 1997 if (restart_block) {
1998 /* A failure happened early enough that we know the destination hasn't
1999 * accessed block devices, so we're safe to recover.
2000 */
2001 Error *local_err = NULL;
2002
2003 bdrv_invalidate_cache_all(&local_err);
2004 if (local_err) {
2005 error_report_err(local_err);
2006 }
2007 }
1d34e4bf
DDAG		 2008 qemu_mutex_unlock_iothread();
2009 return -1;
2010}
2011
e91d8951
DDAG		 2012/**
2013 * migration_maybe_pause: Pause if required to by
2014 * migrate_pause_before_switchover called with the iothread locked
2015 * Returns: 0 on success
2016 */
0331c8ca
DDAG		 2017static int migration_maybe_pause(MigrationState *s,
2018 int *current_active_state,
2019 int new_state)
e91d8951
DDAG		 2020{
2021 if (!migrate_pause_before_switchover()) {
2022 return 0;
2023 }
2024
2025 /* Since leaving this state is not atomic with posting the semaphore
2026 * it's possible that someone could have issued multiple migrate_continue
2027 * and the semaphore is incorrectly positive at this point;
2028 * the docs say it's undefined to reinit a semaphore that's already
2029 * init'd, so use timedwait to eat up any existing posts.
2030 */
2031 while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) {
2032 /* This block intentionally left blank */
2033 }
2034
2035 qemu_mutex_unlock_iothread();
2036 migrate_set_state(&s->state, *current_active_state,
2037 MIGRATION_STATUS_PRE_SWITCHOVER);
2038 qemu_sem_wait(&s->pause_sem);
2039 migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
0331c8ca
DDAG		 2040 new_state);
2041 *current_active_state = new_state;
e91d8951
DDAG		 2042 qemu_mutex_lock_iothread();
2043
0331c8ca 2044 return s->state == new_state ? 0 : -EINVAL;
e91d8951
DDAG		 2045}
2046
09f6c85e
DDAG		 2047/**
2048 * migration_completion: Used by migration_thread when there's not much left.
2049 * The caller 'breaks' the loop when this returns.
2050 *
2051 * @s: Current migration state
09f6c85e 2052 */
2ad87305 2053static void migration_completion(MigrationState *s)
09f6c85e
DDAG		 2054{
2055 int ret;
2ad87305 2056 int current_active_state = s->state;
09f6c85e 2057
b10ac0c4
DDAG		 2058 if (s->state == MIGRATION_STATUS_ACTIVE) {
2059 qemu_mutex_lock_iothread();
64909f97 2060 s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
b10ac0c4 2061 qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
7287cbd4 2062 s->vm_was_running = runstate_is_running();
b10ac0c4
DDAG		 2063 ret = global_state_store();
2064
2065 if (!ret) {
a1fbe750 2066 bool inactivate = !migrate_colo_enabled();
b10ac0c4 2067 ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
e91d8951 2068 if (ret >= 0) {
0331c8ca
DDAG		 2069 ret = migration_maybe_pause(s, &current_active_state,
2070 MIGRATION_STATUS_DEVICE);
e91d8951 2071 }
f07fa4cb
KW		 2072 if (ret >= 0) {
2073 qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
a1fbe750
FZ		 2074 ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
2075 inactivate);
f07fa4cb 2076 }
a1fbe750
FZ		 2077 if (inactivate && ret >= 0) {
2078 s->block_inactive = true;
b10ac0c4
DDAG		 2079 }
2080 }
2081 qemu_mutex_unlock_iothread();
09f6c85e 2082
b10ac0c4
DDAG		 2083 if (ret < 0) {
2084 goto fail;
09f6c85e 2085 }
b10ac0c4
DDAG		 2086 } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
2087 trace_migration_completion_postcopy_end();
2088
89a02a9f 2089 qemu_savevm_state_complete_postcopy(s->to_dst_file);
b10ac0c4 2090 trace_migration_completion_postcopy_end_after_complete();
09f6c85e 2091 }
09f6c85e 2092
b10ac0c4
DDAG		 2093 /*
2094 * If rp was opened we must clean up the thread before
2095 * cleaning everything else up (since if there are no failures
2096 * it will wait for the destination to send it's status in
2097 * a SHUT command).
b10ac0c4 2098 */
0425dc97 2099 if (s->rp_state.from_dst_file) {
b10ac0c4 2100 int rp_error;
0425dc97 2101 trace_migration_return_path_end_before();
b10ac0c4 2102 rp_error = await_return_path_close_on_source(s);
0425dc97 2103 trace_migration_return_path_end_after(rp_error);
b10ac0c4 2104 if (rp_error) {
fe904ea8 2105 goto fail_invalidate;
b10ac0c4 2106 }
09f6c85e
DDAG		 2107 }
2108
89a02a9f 2109 if (qemu_file_get_error(s->to_dst_file)) {
09f6c85e 2110 trace_migration_completion_file_err();
fe904ea8 2111 goto fail_invalidate;
09f6c85e
DDAG		 2112 }
2113
0b827d5e
HZ		 2114 if (!migrate_colo_enabled()) {
2115 migrate_set_state(&s->state, current_active_state,
2116 MIGRATION_STATUS_COMPLETED);
2117 }
2118
09f6c85e
DDAG		 2119 return;
2120
fe904ea8
GK		 2121fail_invalidate:
2122 /* If not doing postcopy, vm_start() will be called: let's regain
2123 * control on images.
2124 */
6039dd5b
DDAG		 2125 if (s->state == MIGRATION_STATUS_ACTIVE ||
2126 s->state == MIGRATION_STATUS_DEVICE) {
fe904ea8
GK		 2127 Error *local_err = NULL;
2128
1d2acc31 2129 qemu_mutex_lock_iothread();
fe904ea8
GK		 2130 bdrv_invalidate_cache_all(&local_err);
2131 if (local_err) {
2132 error_report_err(local_err);
1d2acc31
HZ		 2133 } else {
2134 s->block_inactive = false;
fe904ea8 2135 }
1d2acc31 2136 qemu_mutex_unlock_iothread();
fe904ea8
GK		 2137 }
2138
09f6c85e 2139fail:
48781e5b
HZ		 2140 migrate_set_state(&s->state, current_active_state,
2141 MIGRATION_STATUS_FAILED);
09f6c85e
DDAG		 2142}
2143
35a6ed4f
HZ		 2144bool migrate_colo_enabled(void)
2145{
2146 MigrationState *s = migrate_get_current();
2147 return s->enabled_capabilities[MIGRATION_CAPABILITY_X_COLO];
2148}
2149
cf011f08
PX		 2150static void migration_calculate_complete(MigrationState *s)
2151{
2152 uint64_t bytes = qemu_ftell(s->to_dst_file);
2153 int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2154
2155 s->total_time = end_time - s->start_time;
2156 if (!s->downtime) {
2157 /*
2158 * It's still not set, so we are precopy migration. For
2159 * postcopy, downtime is calculated during postcopy_start().
2160 */
2161 s->downtime = end_time - s->downtime_start;
2162 }
2163
2164 if (s->total_time) {
2165 s->mbps = ((double) bytes * 8.0) / s->total_time / 1000;
2166 }
2167}
2168
b15df1ae
PX		 2169static void migration_update_counters(MigrationState *s,
2170 int64_t current_time)
2171{
2172 uint64_t transferred, time_spent;
b15df1ae
PX		 2173 double bandwidth;
2174
2175 if (current_time < s->iteration_start_time + BUFFER_DELAY) {
2176 return;
2177 }
2178
2179 transferred = qemu_ftell(s->to_dst_file) - s->iteration_initial_bytes;
2180 time_spent = current_time - s->iteration_start_time;
2181 bandwidth = (double)transferred / time_spent;
0781c1ed 2182 s->threshold_size = bandwidth * s->parameters.downtime_limit;
b15df1ae
PX		 2183
2184 s->mbps = (((double) transferred * 8.0) /
2185 ((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
2186
2187 /*
2188 * if we haven't sent anything, we don't want to
2189 * recalculate. 10000 is a small enough number for our purposes
2190 */
2191 if (ram_counters.dirty_pages_rate && transferred > 10000) {
2192 s->expected_downtime = ram_counters.dirty_pages_rate *
2193 qemu_target_page_size() / bandwidth;
2194 }
2195
2196 qemu_file_reset_rate_limit(s->to_dst_file);
2197
2198 s->iteration_start_time = current_time;
2199 s->iteration_initial_bytes = qemu_ftell(s->to_dst_file);
2200
2201 trace_migrate_transferred(transferred, time_spent,
0781c1ed 2202 bandwidth, s->threshold_size);
b15df1ae
PX		 2203}
2204
2ad87305
PX		 2205/* Migration thread iteration status */
2206typedef enum {
2207 MIG_ITERATE_RESUME, /* Resume current iteration */
2208 MIG_ITERATE_SKIP, /* Skip current iteration */
2209 MIG_ITERATE_BREAK, /* Break the loop */
2210} MigIterateState;
2211
2212/*
2213 * Return true if continue to the next iteration directly, false
2214 * otherwise.
2215 */
2216static MigIterateState migration_iteration_run(MigrationState *s)
2217{
2218 uint64_t pending_size, pend_post, pend_nonpost;
2219 bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE;
2220
2221 qemu_savevm_state_pending(s->to_dst_file, s->threshold_size,
2222 &pend_nonpost, &pend_post);
2223 pending_size = pend_nonpost + pend_post;
2224
2225 trace_migrate_pending(pending_size, s->threshold_size,
2226 pend_post, pend_nonpost);
2227
2228 if (pending_size && pending_size >= s->threshold_size) {
2229 /* Still a significant amount to transfer */
2230 if (migrate_postcopy() && !in_postcopy &&
2231 pend_nonpost <= s->threshold_size &&
2232 atomic_read(&s->start_postcopy)) {
2233 if (postcopy_start(s)) {
2234 error_report("%s: postcopy failed to start", __func__);
2235 }
2236 return MIG_ITERATE_SKIP;
2237 }
2238 /* Just another iteration step */
2239 qemu_savevm_state_iterate(s->to_dst_file,
2240 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
2241 } else {
2242 trace_migration_thread_low_pending(pending_size);
2243 migration_completion(s);
2244 return MIG_ITERATE_BREAK;
2245 }
2246
2247 return MIG_ITERATE_RESUME;
2248}
2249
199aa6d4
PX		 2250static void migration_iteration_finish(MigrationState *s)
2251{
2252 /* If we enabled cpu throttling for auto-converge, turn it off. */
2253 cpu_throttle_stop();
2254
2255 qemu_mutex_lock_iothread();
2256 switch (s->state) {
2257 case MIGRATION_STATUS_COMPLETED:
2258 migration_calculate_complete(s);
2259 runstate_set(RUN_STATE_POSTMIGRATE);
2260 break;
2261
2262 case MIGRATION_STATUS_ACTIVE:
2263 /*
2264 * We should really assert here, but since it's during
2265 * migration, let's try to reduce the usage of assertions.
2266 */
2267 if (!migrate_colo_enabled()) {
2268 error_report("%s: critical error: calling COLO code without "
2269 "COLO enabled", __func__);
2270 }
2271 migrate_start_colo_process(s);
2272 /*
2273 * Fixme: we will run VM in COLO no matter its old running state.
2274 * After exited COLO, we will keep running.
2275 */
2276 s->vm_was_running = true;
2277 /* Fallthrough */
2278 case MIGRATION_STATUS_FAILED:
2279 case MIGRATION_STATUS_CANCELLED:
2280 if (s->vm_was_running) {
2281 vm_start();
2282 } else {
2283 if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
2284 runstate_set(RUN_STATE_POSTMIGRATE);
2285 }
2286 }
2287 break;
2288
2289 default:
2290 /* Should not reach here, but if so, forgive the VM. */
2291 error_report("%s: Unknown ending state %d", __func__, s->state);
2292 break;
2293 }
2294 qemu_bh_schedule(s->cleanup_bh);
2295 qemu_mutex_unlock_iothread();
2296}
2297
70b20477
DDAG		 2298/*
2299 * Master migration thread on the source VM.
2300 * It drives the migration and pumps the data down the outgoing channel.
2301 */
5f496a1b 2302static void *migration_thread(void *opaque)
0d82d0e8 2303{
9848a404 2304 MigrationState *s = opaque;
bc72ad67 2305 int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
76f5933a 2306
ab28bd23
PB		 2307 rcu_register_thread();
2308
b15df1ae
PX		 2309 s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
2310
89a02a9f 2311 qemu_savevm_state_header(s->to_dst_file);
1d34e4bf 2312
62a02658
PX		 2313 /*
2314 * If we opened the return path, we need to make sure dst has it
2315 * opened as well.
2316 */
2317 if (s->rp_state.from_dst_file) {
1d34e4bf 2318 /* Now tell the dest that it should open its end so it can reply */
89a02a9f 2319 qemu_savevm_send_open_return_path(s->to_dst_file);
1d34e4bf
DDAG		 2320
2321 /* And do a ping that will make stuff easier to debug */
89a02a9f 2322 qemu_savevm_send_ping(s->to_dst_file, 1);
0425dc97 2323 }
1d34e4bf 2324
58110f0a 2325 if (migrate_postcopy()) {
1d34e4bf
DDAG		 2326 /*
2327 * Tell the destination that we *might* want to do postcopy later;
2328 * if the other end can't do postcopy it should fail now, nice and
2329 * early.
2330 */
89a02a9f 2331 qemu_savevm_send_postcopy_advise(s->to_dst_file);
1d34e4bf
DDAG		 2332 }
2333
9907e842 2334 qemu_savevm_state_setup(s->to_dst_file);
0d82d0e8 2335
bc72ad67 2336 s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
48781e5b
HZ		 2337 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
2338 MIGRATION_STATUS_ACTIVE);
29ae8a41 2339
9ec055ae
DDAG		 2340 trace_migration_thread_setup_complete();
2341
2342 while (s->state == MIGRATION_STATUS_ACTIVE ||
2343 s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
a3e879cd 2344 int64_t current_time;
0d82d0e8 2345
89a02a9f 2346 if (!qemu_file_rate_limit(s->to_dst_file)) {
2ad87305
PX		 2347 MigIterateState iter_state = migration_iteration_run(s);
2348 if (iter_state == MIG_ITERATE_SKIP) {
2349 continue;
2350 } else if (iter_state == MIG_ITERATE_BREAK) {
09f6c85e 2351 break;
c369f40d
JQ		 2352 }
2353 }
f4410a5d 2354
89a02a9f 2355 if (qemu_file_get_error(s->to_dst_file)) {
2ad87305
PX		 2356 if (migration_is_setup_or_active(s->state)) {
2357 migrate_set_state(&s->state, s->state,
2358 MIGRATION_STATUS_FAILED);
2359 }
1d34e4bf 2360 trace_migration_thread_file_err();
fd45ee2c
PB		 2361 break;
2362 }
b15df1ae 2363
bc72ad67 2364 current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
0d82d0e8 2365
b15df1ae
PX		 2366 migration_update_counters(s, current_time);
2367
89a02a9f 2368 if (qemu_file_rate_limit(s->to_dst_file)) {
0d82d0e8 2369 /* usleep expects microseconds */
b15df1ae
PX		 2370 g_usleep((s->iteration_start_time + BUFFER_DELAY -
2371 current_time) * 1000);
0d82d0e8 2372 }
a3fa1d78
PB		 2373 }
2374
1d34e4bf 2375 trace_migration_thread_after_loop();
199aa6d4 2376 migration_iteration_finish(s);
ab28bd23 2377 rcu_unregister_thread();
0d82d0e8
JQ		 2378 return NULL;
2379}
2380
cce8040b 2381void migrate_fd_connect(MigrationState *s, Error *error_in)
0d82d0e8 2382{
2ff30257 2383 s->expected_downtime = s->parameters.downtime_limit;
bb1fadc4 2384 s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
cce8040b
DDAG		 2385 if (error_in) {
2386 migrate_fd_error(s, error_in);
2387 migrate_fd_cleanup(s);
2388 return;
2389 }
0d82d0e8 2390
9e4d2b98 2391 qemu_file_set_blocking(s->to_dst_file, true);
89a02a9f 2392 qemu_file_set_rate_limit(s->to_dst_file,
2ff30257 2393 s->parameters.max_bandwidth / XFER_LIMIT_RATIO);
442773ce 2394
9287ac27
SH		 2395 /* Notify before starting migration thread */
2396 notifier_list_notify(&migration_state_notifiers, s);
2397
1d34e4bf 2398 /*
c788ada8
PX		 2399 * Open the return path. For postcopy, it is used exclusively. For
2400 * precopy, only if user specified "return-path" capability would
2401 * QEMU uses the return path.
1d34e4bf 2402 */
c788ada8 2403 if (migrate_postcopy_ram() || migrate_use_return_path()) {
1d34e4bf
DDAG		 2404 if (open_return_path_on_source(s)) {
2405 error_report("Unable to open return-path for postcopy");
48781e5b 2406 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
1d34e4bf
DDAG		 2407 MIGRATION_STATUS_FAILED);
2408 migrate_fd_cleanup(s);
2409 return;
2410 }
2411 }
2412
f986c3d2
JQ		 2413 if (multifd_save_setup() != 0) {
2414 migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
2415 MIGRATION_STATUS_FAILED);
2416 migrate_fd_cleanup(s);
2417 return;
2418 }
009fad7f 2419 qemu_thread_create(&s->thread, "live_migration", migration_thread, s,
bb1fadc4 2420 QEMU_THREAD_JOINABLE);
1d34e4bf 2421 s->migration_thread_running = true;
0d82d0e8 2422}
093e3c42 2423
9d18af93
PX		 2424void migration_global_dump(Monitor *mon)
2425{
2426 MigrationState *ms = migrate_get_current();
2427
6f0f6428
JQ		 2428 monitor_printf(mon, "globals:\n");
2429 monitor_printf(mon, "store-global-state: %s\n",
2430 ms->store_global_state ? "on" : "off");
2431 monitor_printf(mon, "only-migratable: %s\n",
2432 ms->only_migratable ? "on" : "off");
2433 monitor_printf(mon, "send-configuration: %s\n",
2434 ms->send_configuration ? "on" : "off");
2435 monitor_printf(mon, "send-section-footer: %s\n",
2436 ms->send_section_footer ? "on" : "off");
9d18af93
PX		 2437}
2438
20814758
PX		 2439#define DEFINE_PROP_MIG_CAP(name, x) \
2440 DEFINE_PROP_BOOL(name, MigrationState, enabled_capabilities[x], false)
2441
5272298c
PX		 2442static Property migration_properties[] = {
2443 DEFINE_PROP_BOOL("store-global-state", MigrationState,
2444 store_global_state, true),
3df663e5 2445 DEFINE_PROP_BOOL("only-migratable", MigrationState, only_migratable, false),
71dd4c1a
PX		 2446 DEFINE_PROP_BOOL("send-configuration", MigrationState,
2447 send_configuration, true),
15c38503
PX		 2448 DEFINE_PROP_BOOL("send-section-footer", MigrationState,
2449 send_section_footer, true),
89632faf
PX		 2450
2451 /* Migration parameters */
741d4086 2452 DEFINE_PROP_UINT8("x-compress-level", MigrationState,
89632faf
PX		 2453 parameters.compress_level,
2454 DEFAULT_MIGRATE_COMPRESS_LEVEL),
741d4086 2455 DEFINE_PROP_UINT8("x-compress-threads", MigrationState,
89632faf
PX		 2456 parameters.compress_threads,
2457 DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT),
741d4086 2458 DEFINE_PROP_UINT8("x-decompress-threads", MigrationState,
89632faf
PX		 2459 parameters.decompress_threads,
2460 DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT),
741d4086 2461 DEFINE_PROP_UINT8("x-cpu-throttle-initial", MigrationState,
89632faf
PX		 2462 parameters.cpu_throttle_initial,
2463 DEFAULT_MIGRATE_CPU_THROTTLE_INITIAL),
741d4086 2464 DEFINE_PROP_UINT8("x-cpu-throttle-increment", MigrationState,
89632faf
PX		 2465 parameters.cpu_throttle_increment,
2466 DEFAULT_MIGRATE_CPU_THROTTLE_INCREMENT),
741d4086 2467 DEFINE_PROP_SIZE("x-max-bandwidth", MigrationState,
89632faf 2468 parameters.max_bandwidth, MAX_THROTTLE),
741d4086 2469 DEFINE_PROP_UINT64("x-downtime-limit", MigrationState,
89632faf
PX		 2470 parameters.downtime_limit,
2471 DEFAULT_MIGRATE_SET_DOWNTIME),
741d4086 2472 DEFINE_PROP_UINT32("x-checkpoint-delay", MigrationState,
89632faf
PX		 2473 parameters.x_checkpoint_delay,
2474 DEFAULT_MIGRATE_X_CHECKPOINT_DELAY),
741d4086 2475 DEFINE_PROP_UINT8("x-multifd-channels", MigrationState,
4075fb1c
JQ		 2476 parameters.x_multifd_channels,
2477 DEFAULT_MIGRATE_MULTIFD_CHANNELS),
741d4086 2478 DEFINE_PROP_UINT32("x-multifd-page-count", MigrationState,
0fb86605
JQ		 2479 parameters.x_multifd_page_count,
2480 DEFAULT_MIGRATE_MULTIFD_PAGE_COUNT),
73af8dd8
JQ		 2481 DEFINE_PROP_SIZE("xbzrle-cache-size", MigrationState,
2482 parameters.xbzrle_cache_size,
2483 DEFAULT_MIGRATE_XBZRLE_CACHE_SIZE),
20814758
PX		 2484
2485 /* Migration capabilities */
2486 DEFINE_PROP_MIG_CAP("x-xbzrle", MIGRATION_CAPABILITY_XBZRLE),
2487 DEFINE_PROP_MIG_CAP("x-rdma-pin-all", MIGRATION_CAPABILITY_RDMA_PIN_ALL),
2488 DEFINE_PROP_MIG_CAP("x-auto-converge", MIGRATION_CAPABILITY_AUTO_CONVERGE),
2489 DEFINE_PROP_MIG_CAP("x-zero-blocks", MIGRATION_CAPABILITY_ZERO_BLOCKS),
2490 DEFINE_PROP_MIG_CAP("x-compress", MIGRATION_CAPABILITY_COMPRESS),
2491 DEFINE_PROP_MIG_CAP("x-events", MIGRATION_CAPABILITY_EVENTS),
2492 DEFINE_PROP_MIG_CAP("x-postcopy-ram", MIGRATION_CAPABILITY_POSTCOPY_RAM),
2493 DEFINE_PROP_MIG_CAP("x-colo", MIGRATION_CAPABILITY_X_COLO),
2494 DEFINE_PROP_MIG_CAP("x-release-ram", MIGRATION_CAPABILITY_RELEASE_RAM),
2495 DEFINE_PROP_MIG_CAP("x-block", MIGRATION_CAPABILITY_BLOCK),
2496 DEFINE_PROP_MIG_CAP("x-return-path", MIGRATION_CAPABILITY_RETURN_PATH),
30126bbf 2497 DEFINE_PROP_MIG_CAP("x-multifd", MIGRATION_CAPABILITY_X_MULTIFD),
20814758 2498
5272298c
PX		 2499 DEFINE_PROP_END_OF_LIST(),
2500};
2501
e5cb7e76
PX		 2502static void migration_class_init(ObjectClass *klass, void *data)
2503{
2504 DeviceClass *dc = DEVICE_CLASS(klass);
2505
2506 dc->user_creatable = false;
5272298c 2507 dc->props = migration_properties;
e5cb7e76
PX		 2508}
2509
b91bf5e4
MAL		 2510static void migration_instance_finalize(Object *obj)
2511{
2512 MigrationState *ms = MIGRATION_OBJ(obj);
2513 MigrationParameters *params = &ms->parameters;
2514
87db1a7d 2515 qemu_mutex_destroy(&ms->error_mutex);
b91bf5e4
MAL		 2516 g_free(params->tls_hostname);
2517 g_free(params->tls_creds);
e91d8951 2518 qemu_sem_destroy(&ms->pause_sem);
b91bf5e4
MAL		 2519}
2520
e5cb7e76
PX		 2521static void migration_instance_init(Object *obj)
2522{
2523 MigrationState *ms = MIGRATION_OBJ(obj);
8b0b29dc 2524 MigrationParameters *params = &ms->parameters;
e5cb7e76
PX		 2525
2526 ms->state = MIGRATION_STATUS_NONE;
e5cb7e76 2527 ms->mbps = -1;
e91d8951 2528 qemu_sem_init(&ms->pause_sem, 0);
87db1a7d 2529 qemu_mutex_init(&ms->error_mutex);
8b0b29dc
PX		 2530
2531 params->tls_hostname = g_strdup("");
2532 params->tls_creds = g_strdup("");
2533
2534 /* Set has_* up only for parameter checks */
2535 params->has_compress_level = true;
2536 params->has_compress_threads = true;
2537 params->has_decompress_threads = true;
2538 params->has_cpu_throttle_initial = true;
2539 params->has_cpu_throttle_increment = true;
2540 params->has_max_bandwidth = true;
2541 params->has_downtime_limit = true;
2542 params->has_x_checkpoint_delay = true;
2543 params->has_block_incremental = true;
4075fb1c 2544 params->has_x_multifd_channels = true;
0fb86605 2545 params->has_x_multifd_page_count = true;
73af8dd8 2546 params->has_xbzrle_cache_size = true;
8b0b29dc
PX		 2547}
2548
2549/*
2550 * Return true if check pass, false otherwise. Error will be put
2551 * inside errp if provided.
2552 */
2553static bool migration_object_check(MigrationState *ms, Error **errp)
2554{
6b19a7d9
PX		 2555 MigrationCapabilityStatusList *head = NULL;
2556 /* Assuming all off */
2557 bool cap_list[MIGRATION_CAPABILITY__MAX] = { 0 }, ret;
2558 int i;
2559
8b0b29dc
PX		 2560 if (!migrate_params_check(&ms->parameters, errp)) {
2561 return false;
2562 }
2563
6b19a7d9
PX		 2564 for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
2565 if (ms->enabled_capabilities[i]) {
2566 head = migrate_cap_add(head, i, true);
2567 }
2568 }
2569
2570 ret = migrate_caps_check(cap_list, head, errp);
2571
2572 /* It works with head == NULL */
2573 qapi_free_MigrationCapabilityStatusList(head);
2574
2575 return ret;
e5cb7e76
PX		 2576}
2577
2578static const TypeInfo migration_type = {
2579 .name = TYPE_MIGRATION,
01f6e14c 2580 /*
c8d3ff38
PX		 2581 * NOTE: TYPE_MIGRATION is not really a device, as the object is
2582 * not created using qdev_create(), it is not attached to the qdev
2583 * device tree, and it is never realized.
2584 *
2585 * TODO: Make this TYPE_OBJECT once QOM provides something like
2586 * TYPE_DEVICE's "-global" properties.
01f6e14c 2587 */
e5cb7e76
PX		 2588 .parent = TYPE_DEVICE,
2589 .class_init = migration_class_init,
2590 .class_size = sizeof(MigrationClass),
2591 .instance_size = sizeof(MigrationState),
2592 .instance_init = migration_instance_init,
b91bf5e4 2593 .instance_finalize = migration_instance_finalize,
e5cb7e76
PX		 2594};
2595
2596static void register_migration_types(void)
2597{
2598 type_register_static(&migration_type);
2599}
2600
2601type_init(register_migration_types);
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