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Commit | Line | Data |
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5bb7910a AL |
1 | /* |
2 | * QEMU live migration | |
3 | * | |
4 | * Copyright IBM, Corp. 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
6b620ca3 PB |
12 | * Contributions after 2012-01-13 are licensed under the terms of the |
13 | * GNU GPL, version 2 or (at your option) any later version. | |
5bb7910a AL |
14 | */ |
15 | ||
1393a485 | 16 | #include "qemu/osdep.h" |
f348b6d1 | 17 | #include "qemu/cutils.h" |
d49b6836 | 18 | #include "qemu/error-report.h" |
db725815 | 19 | #include "qemu/main-loop.h" |
795c40b8 | 20 | #include "migration/blocker.h" |
f4dbe1bf | 21 | #include "exec.h" |
7fcac4a2 | 22 | #include "fd.h" |
2a9e2e59 | 23 | #include "file.h" |
61e8b148 | 24 | #include "socket.h" |
54d31236 | 25 | #include "sysemu/runstate.h" |
46517dd4 | 26 | #include "sysemu/sysemu.h" |
b0c3cf94 | 27 | #include "sysemu/cpu-throttle.h" |
e1a3ecee | 28 | #include "rdma.h" |
7b1e1a22 | 29 | #include "ram.h" |
c323518a | 30 | #include "ram-compress.h" |
84a899de | 31 | #include "migration/global_state.h" |
c4b63b7c | 32 | #include "migration/misc.h" |
6666c96a | 33 | #include "migration.h" |
947701cc | 34 | #include "migration-stats.h" |
20a519a0 | 35 | #include "savevm.h" |
08a0aee1 | 36 | #include "qemu-file.h" |
6720c2b3 | 37 | #include "channel.h" |
987772d9 | 38 | #include "migration/vmstate.h" |
737e150e | 39 | #include "block/block.h" |
e688df6b | 40 | #include "qapi/error.h" |
9aca82ba | 41 | #include "qapi/clone-visitor.h" |
31e4c354 | 42 | #include "qapi/qapi-visit-migration.h" |
9aca82ba | 43 | #include "qapi/qapi-visit-sockets.h" |
9af23989 MA |
44 | #include "qapi/qapi-commands-migration.h" |
45 | #include "qapi/qapi-events-migration.h" | |
cc7a8ea7 | 46 | #include "qapi/qmp/qerror.h" |
15280c36 | 47 | #include "qapi/qmp/qnull.h" |
ab28bd23 | 48 | #include "qemu/rcu.h" |
2c9e6fec | 49 | #include "block.h" |
be07b0ac | 50 | #include "postcopy-ram.h" |
766bd176 | 51 | #include "qemu/thread.h" |
c09e5bb1 | 52 | #include "trace.h" |
51180423 | 53 | #include "exec/target_page.h" |
61b67d47 | 54 | #include "io/channel-buffer.h" |
85a8578e | 55 | #include "io/channel-tls.h" |
35a6ed4f | 56 | #include "migration/colo.h" |
4ffdb337 | 57 | #include "hw/boards.h" |
9d18af93 | 58 | #include "monitor/monitor.h" |
50510ea2 | 59 | #include "net/announce.h" |
c7e0acd5 | 60 | #include "qemu/queue.h" |
d32ca5ad | 61 | #include "multifd.h" |
1b1f4ab6 | 62 | #include "threadinfo.h" |
b5eea99e | 63 | #include "qemu/yank.h" |
6e8c25b4 | 64 | #include "sysemu/cpus.h" |
39675fff | 65 | #include "yank_functions.h" |
1b529d90 | 66 | #include "sysemu/qtest.h" |
1f0776f1 | 67 | #include "options.h" |
15699cf5 | 68 | #include "sysemu/dirtylimit.h" |
065e2813 | 69 | |
99a0db9b GH |
70 | static NotifierList migration_state_notifiers = |
71 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
72 | ||
da6f1790 JQ |
73 | /* Messages sent on the return path from destination to source */ |
74 | enum mig_rp_message_type { | |
75 | MIG_RP_MSG_INVALID = 0, /* Must be 0 */ | |
76 | MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */ | |
77 | MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */ | |
78 | ||
79 | MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */ | |
80 | MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */ | |
a335debb | 81 | MIG_RP_MSG_RECV_BITMAP, /* send recved_bitmap back to source */ |
13955b89 | 82 | MIG_RP_MSG_RESUME_ACK, /* tell source that we are ready to resume */ |
1b4adb10 | 83 | MIG_RP_MSG_SWITCHOVER_ACK, /* Tell source it's OK to do switchover */ |
da6f1790 JQ |
84 | |
85 | MIG_RP_MSG_MAX | |
86 | }; | |
87 | ||
17549e84 JQ |
88 | /* When we add fault tolerance, we could have several |
89 | migrations at once. For now we don't need to add | |
90 | dynamic creation of migration */ | |
91 | ||
e5cb7e76 | 92 | static MigrationState *current_migration; |
e1b1b1bc | 93 | static MigrationIncomingState *current_incoming; |
e5cb7e76 | 94 | |
3af8554b DDAG |
95 | static GSList *migration_blockers; |
96 | ||
8b0b29dc | 97 | static bool migration_object_check(MigrationState *ms, Error **errp); |
0331c8ca DDAG |
98 | static int migration_maybe_pause(MigrationState *s, |
99 | int *current_active_state, | |
100 | int new_state); | |
892ae715 | 101 | static void migrate_fd_cancel(MigrationState *s); |
d7f5a043 | 102 | static int close_return_path_on_source(MigrationState *s); |
8b0b29dc | 103 | |
e22ffad0 PX |
104 | static void migration_downtime_start(MigrationState *s) |
105 | { | |
3e5f3bcd | 106 | trace_vmstate_downtime_checkpoint("src-downtime-start"); |
e22ffad0 PX |
107 | s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
108 | } | |
109 | ||
110 | static void migration_downtime_end(MigrationState *s) | |
111 | { | |
112 | int64_t now = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
113 | ||
114 | /* | |
115 | * If downtime already set, should mean that postcopy already set it, | |
116 | * then that should be the real downtime already. | |
117 | */ | |
118 | if (!s->downtime) { | |
119 | s->downtime = now - s->downtime_start; | |
120 | } | |
3e5f3bcd PX |
121 | |
122 | trace_vmstate_downtime_checkpoint("src-downtime-end"); | |
e22ffad0 PX |
123 | } |
124 | ||
d6f74fd1 PX |
125 | static bool migration_needs_multiple_sockets(void) |
126 | { | |
51b07548 | 127 | return migrate_multifd() || migrate_postcopy_preempt(); |
d6f74fd1 | 128 | } |
f444eeda | 129 | |
d6f74fd1 | 130 | static bool uri_supports_multi_channels(const char *uri) |
f444eeda | 131 | { |
d6f74fd1 PX |
132 | return strstart(uri, "tcp:", NULL) || strstart(uri, "unix:", NULL) || |
133 | strstart(uri, "vsock:", NULL); | |
f444eeda PX |
134 | } |
135 | ||
d6f74fd1 PX |
136 | static bool |
137 | migration_channels_and_uri_compatible(const char *uri, Error **errp) | |
f444eeda | 138 | { |
d6f74fd1 PX |
139 | if (migration_needs_multiple_sockets() && |
140 | !uri_supports_multi_channels(uri)) { | |
141 | error_setg(errp, "Migration requires multi-channel URIs (e.g. tcp)"); | |
142 | return false; | |
143 | } | |
144 | ||
145 | return true; | |
f444eeda PX |
146 | } |
147 | ||
8f8bfffc PX |
148 | static gint page_request_addr_cmp(gconstpointer ap, gconstpointer bp) |
149 | { | |
150 | uintptr_t a = (uintptr_t) ap, b = (uintptr_t) bp; | |
151 | ||
152 | return (a > b) - (a < b); | |
153 | } | |
154 | ||
93bdf888 PX |
155 | int migration_stop_vm(RunState state) |
156 | { | |
3e5f3bcd PX |
157 | int ret = vm_stop_force_state(state); |
158 | ||
159 | trace_vmstate_downtime_checkpoint("src-vm-stopped"); | |
160 | ||
161 | return ret; | |
93bdf888 PX |
162 | } |
163 | ||
e5cb7e76 PX |
164 | void migration_object_init(void) |
165 | { | |
166 | /* This can only be called once. */ | |
167 | assert(!current_migration); | |
168 | current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION)); | |
4ffdb337 | 169 | |
e1b1b1bc PX |
170 | /* |
171 | * Init the migrate incoming object as well no matter whether | |
172 | * we'll use it or not. | |
173 | */ | |
174 | assert(!current_incoming); | |
175 | current_incoming = g_new0(MigrationIncomingState, 1); | |
176 | current_incoming->state = MIGRATION_STATUS_NONE; | |
177 | current_incoming->postcopy_remote_fds = | |
178 | g_array_new(FALSE, TRUE, sizeof(struct PostCopyFD)); | |
179 | qemu_mutex_init(¤t_incoming->rp_mutex); | |
60bb3c58 | 180 | qemu_mutex_init(¤t_incoming->postcopy_prio_thread_mutex); |
e1b1b1bc PX |
181 | qemu_event_init(¤t_incoming->main_thread_load_event, false); |
182 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_dst, 0); | |
183 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_fault, 0); | |
60bb3c58 | 184 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_fast_load, 0); |
5655aab0 PX |
185 | qemu_sem_init(¤t_incoming->postcopy_qemufile_dst_done, 0); |
186 | ||
8f8bfffc | 187 | qemu_mutex_init(¤t_incoming->page_request_mutex); |
cf02f29e | 188 | qemu_cond_init(¤t_incoming->page_request_cond); |
8f8bfffc | 189 | current_incoming->page_requested = g_tree_new(page_request_addr_cmp); |
e1b1b1bc | 190 | |
f9734d5d | 191 | migration_object_check(current_migration, &error_fatal); |
e0d17dfd PB |
192 | |
193 | blk_mig_init(); | |
194 | ram_mig_init(); | |
195 | dirty_bitmap_mig_init(); | |
e5cb7e76 PX |
196 | } |
197 | ||
458fecca | 198 | void migration_cancel(const Error *error) |
c7c0e724 | 199 | { |
458fecca LV |
200 | if (error) { |
201 | migrate_set_error(current_migration, error); | |
202 | } | |
acac51ba HH |
203 | if (migrate_dirty_limit()) { |
204 | qmp_cancel_vcpu_dirty_limit(false, -1, NULL); | |
205 | } | |
c7c0e724 DH |
206 | migrate_fd_cancel(current_migration); |
207 | } | |
208 | ||
892ae715 | 209 | void migration_shutdown(void) |
1f895604 | 210 | { |
795969ab RL |
211 | /* |
212 | * When the QEMU main thread exit, the COLO thread | |
213 | * may wait a semaphore. So, we should wakeup the | |
214 | * COLO thread before migration shutdown. | |
215 | */ | |
216 | colo_shutdown(); | |
892ae715 DDAG |
217 | /* |
218 | * Cancel the current migration - that will (eventually) | |
219 | * stop the migration using this structure | |
220 | */ | |
458fecca | 221 | migration_cancel(NULL); |
1f895604 | 222 | object_unref(OBJECT(current_migration)); |
1499ab09 VSO |
223 | |
224 | /* | |
225 | * Cancel outgoing migration of dirty bitmaps. It should | |
226 | * at least unref used block nodes. | |
227 | */ | |
228 | dirty_bitmap_mig_cancel_outgoing(); | |
229 | ||
230 | /* | |
231 | * Cancel incoming migration of dirty bitmaps. Dirty bitmaps | |
232 | * are non-critical data, and their loss never considered as | |
233 | * something serious. | |
234 | */ | |
235 | dirty_bitmap_mig_cancel_incoming(); | |
1f895604 VSO |
236 | } |
237 | ||
bca7856a | 238 | /* For outgoing */ |
859bc756 | 239 | MigrationState *migrate_get_current(void) |
17549e84 | 240 | { |
e5cb7e76 PX |
241 | /* This can only be called after the object created. */ |
242 | assert(current_migration); | |
243 | return current_migration; | |
17549e84 JQ |
244 | } |
245 | ||
bca7856a DDAG |
246 | MigrationIncomingState *migration_incoming_get_current(void) |
247 | { | |
e1b1b1bc PX |
248 | assert(current_incoming); |
249 | return current_incoming; | |
bca7856a DDAG |
250 | } |
251 | ||
e031149c PX |
252 | void migration_incoming_transport_cleanup(MigrationIncomingState *mis) |
253 | { | |
254 | if (mis->socket_address_list) { | |
255 | qapi_free_SocketAddressList(mis->socket_address_list); | |
256 | mis->socket_address_list = NULL; | |
257 | } | |
258 | ||
259 | if (mis->transport_cleanup) { | |
260 | mis->transport_cleanup(mis->transport_data); | |
261 | mis->transport_data = mis->transport_cleanup = NULL; | |
262 | } | |
263 | } | |
264 | ||
bca7856a DDAG |
265 | void migration_incoming_state_destroy(void) |
266 | { | |
b4b076da JQ |
267 | struct MigrationIncomingState *mis = migration_incoming_get_current(); |
268 | ||
cfc3bcf3 | 269 | multifd_load_cleanup(); |
c323518a | 270 | compress_threads_load_cleanup(); |
cfc3bcf3 | 271 | |
3482655b | 272 | if (mis->to_src_file) { |
660819b1 PX |
273 | /* Tell source that we are done */ |
274 | migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0); | |
3482655b PX |
275 | qemu_fclose(mis->to_src_file); |
276 | mis->to_src_file = NULL; | |
277 | } | |
278 | ||
660819b1 | 279 | if (mis->from_src_file) { |
39675fff | 280 | migration_ioc_unregister_yank_from_file(mis->from_src_file); |
660819b1 PX |
281 | qemu_fclose(mis->from_src_file); |
282 | mis->from_src_file = NULL; | |
283 | } | |
00fa4fc8 DDAG |
284 | if (mis->postcopy_remote_fds) { |
285 | g_array_free(mis->postcopy_remote_fds, TRUE); | |
286 | mis->postcopy_remote_fds = NULL; | |
287 | } | |
660819b1 | 288 | |
e031149c | 289 | migration_incoming_transport_cleanup(mis); |
1783c00f DDAG |
290 | qemu_event_reset(&mis->main_thread_load_event); |
291 | ||
8f8bfffc PX |
292 | if (mis->page_requested) { |
293 | g_tree_destroy(mis->page_requested); | |
294 | mis->page_requested = NULL; | |
295 | } | |
296 | ||
36f62f11 PX |
297 | if (mis->postcopy_qemufile_dst) { |
298 | migration_ioc_unregister_yank_from_file(mis->postcopy_qemufile_dst); | |
299 | qemu_fclose(mis->postcopy_qemufile_dst); | |
300 | mis->postcopy_qemufile_dst = NULL; | |
301 | } | |
302 | ||
b5eea99e | 303 | yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
bca7856a DDAG |
304 | } |
305 | ||
b05dc723 JQ |
306 | static void migrate_generate_event(int new_state) |
307 | { | |
b890902c | 308 | if (migrate_events()) { |
3ab72385 | 309 | qapi_event_send_migration(new_state); |
b05dc723 JQ |
310 | } |
311 | } | |
312 | ||
da6f1790 JQ |
313 | /* |
314 | * Send a message on the return channel back to the source | |
315 | * of the migration. | |
316 | */ | |
d6208e35 PX |
317 | static int migrate_send_rp_message(MigrationIncomingState *mis, |
318 | enum mig_rp_message_type message_type, | |
319 | uint16_t len, void *data) | |
da6f1790 | 320 | { |
d6208e35 PX |
321 | int ret = 0; |
322 | ||
da6f1790 | 323 | trace_migrate_send_rp_message((int)message_type, len); |
37396950 | 324 | QEMU_LOCK_GUARD(&mis->rp_mutex); |
d6208e35 PX |
325 | |
326 | /* | |
327 | * It's possible that the file handle got lost due to network | |
328 | * failures. | |
329 | */ | |
330 | if (!mis->to_src_file) { | |
331 | ret = -EIO; | |
37396950 | 332 | return ret; |
d6208e35 PX |
333 | } |
334 | ||
da6f1790 JQ |
335 | qemu_put_be16(mis->to_src_file, (unsigned int)message_type); |
336 | qemu_put_be16(mis->to_src_file, len); | |
337 | qemu_put_buffer(mis->to_src_file, data, len); | |
be07a0ed | 338 | return qemu_fflush(mis->to_src_file); |
da6f1790 JQ |
339 | } |
340 | ||
2e2bce16 PX |
341 | /* Request one page from the source VM at the given start address. |
342 | * rb: the RAMBlock to request the page in | |
1e2d90eb DDAG |
343 | * Start: Address offset within the RB |
344 | * Len: Length in bytes required - must be a multiple of pagesize | |
345 | */ | |
7a267fc4 PX |
346 | int migrate_send_rp_message_req_pages(MigrationIncomingState *mis, |
347 | RAMBlock *rb, ram_addr_t start) | |
1e2d90eb | 348 | { |
cb8d4c8f | 349 | uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ |
1e2d90eb | 350 | size_t msglen = 12; /* start + len */ |
2e2bce16 | 351 | size_t len = qemu_ram_pagesize(rb); |
d6208e35 | 352 | enum mig_rp_message_type msg_type; |
2e2bce16 PX |
353 | const char *rbname; |
354 | int rbname_len; | |
1e2d90eb DDAG |
355 | |
356 | *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); | |
357 | *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); | |
358 | ||
2e2bce16 PX |
359 | /* |
360 | * We maintain the last ramblock that we requested for page. Note that we | |
361 | * don't need locking because this function will only be called within the | |
362 | * postcopy ram fault thread. | |
363 | */ | |
364 | if (rb != mis->last_rb) { | |
365 | mis->last_rb = rb; | |
366 | ||
367 | rbname = qemu_ram_get_idstr(rb); | |
368 | rbname_len = strlen(rbname); | |
369 | ||
1e2d90eb DDAG |
370 | assert(rbname_len < 256); |
371 | ||
372 | bufc[msglen++] = rbname_len; | |
373 | memcpy(bufc + msglen, rbname, rbname_len); | |
374 | msglen += rbname_len; | |
d6208e35 | 375 | msg_type = MIG_RP_MSG_REQ_PAGES_ID; |
1e2d90eb | 376 | } else { |
d6208e35 | 377 | msg_type = MIG_RP_MSG_REQ_PAGES; |
1e2d90eb | 378 | } |
d6208e35 PX |
379 | |
380 | return migrate_send_rp_message(mis, msg_type, msglen, bufc); | |
1e2d90eb DDAG |
381 | } |
382 | ||
7a267fc4 | 383 | int migrate_send_rp_req_pages(MigrationIncomingState *mis, |
8f8bfffc | 384 | RAMBlock *rb, ram_addr_t start, uint64_t haddr) |
7a267fc4 | 385 | { |
7648297d | 386 | void *aligned = (void *)(uintptr_t)ROUND_DOWN(haddr, qemu_ram_pagesize(rb)); |
a2429283 | 387 | bool received = false; |
8f8bfffc PX |
388 | |
389 | WITH_QEMU_LOCK_GUARD(&mis->page_request_mutex) { | |
390 | received = ramblock_recv_bitmap_test_byte_offset(rb, start); | |
391 | if (!received && !g_tree_lookup(mis->page_requested, aligned)) { | |
392 | /* | |
393 | * The page has not been received, and it's not yet in the page | |
394 | * request list. Queue it. Set the value of element to 1, so that | |
395 | * things like g_tree_lookup() will return TRUE (1) when found. | |
396 | */ | |
397 | g_tree_insert(mis->page_requested, aligned, (gpointer)1); | |
cf02f29e | 398 | qatomic_inc(&mis->page_requested_count); |
8f8bfffc PX |
399 | trace_postcopy_page_req_add(aligned, mis->page_requested_count); |
400 | } | |
401 | } | |
402 | ||
403 | /* | |
404 | * If the page is there, skip sending the message. We don't even need the | |
405 | * lock because as long as the page arrived, it'll be there forever. | |
406 | */ | |
407 | if (received) { | |
408 | return 0; | |
409 | } | |
410 | ||
7a267fc4 PX |
411 | return migrate_send_rp_message_req_pages(mis, rb, start); |
412 | } | |
413 | ||
aad555c2 ZC |
414 | static bool migration_colo_enabled; |
415 | bool migration_incoming_colo_enabled(void) | |
416 | { | |
417 | return migration_colo_enabled; | |
418 | } | |
419 | ||
420 | void migration_incoming_disable_colo(void) | |
421 | { | |
18b1d3c9 | 422 | ram_block_discard_disable(false); |
aad555c2 ZC |
423 | migration_colo_enabled = false; |
424 | } | |
425 | ||
18b1d3c9 | 426 | int migration_incoming_enable_colo(void) |
aad555c2 | 427 | { |
51e47cf8 VSO |
428 | #ifndef CONFIG_REPLICATION |
429 | error_report("ENABLE_COLO command come in migration stream, but COLO " | |
430 | "module is not built in"); | |
431 | return -ENOTSUP; | |
432 | #endif | |
433 | ||
121ccedc VSO |
434 | if (!migrate_colo()) { |
435 | error_report("ENABLE_COLO command come in migration stream, but c-colo " | |
436 | "capability is not set"); | |
437 | return -EINVAL; | |
438 | } | |
439 | ||
18b1d3c9 DH |
440 | if (ram_block_discard_disable(true)) { |
441 | error_report("COLO: cannot disable RAM discard"); | |
442 | return -EBUSY; | |
443 | } | |
aad555c2 | 444 | migration_colo_enabled = true; |
18b1d3c9 | 445 | return 0; |
aad555c2 ZC |
446 | } |
447 | ||
9aca82ba JQ |
448 | void migrate_add_address(SocketAddress *address) |
449 | { | |
450 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
9aca82ba | 451 | |
54aa3de7 EB |
452 | QAPI_LIST_PREPEND(mis->socket_address_list, |
453 | QAPI_CLONE(SocketAddress, address)); | |
9aca82ba JQ |
454 | } |
455 | ||
e69d50d6 | 456 | static void qemu_start_incoming_migration(const char *uri, Error **errp) |
5bb7910a | 457 | { |
d658f65c | 458 | const char *p = NULL; |
4111a732 | 459 | MigrationIncomingState *mis = migration_incoming_get_current(); |
34c9dd8e | 460 | |
d6f74fd1 PX |
461 | /* URI is not suitable for migration? */ |
462 | if (!migration_channels_and_uri_compatible(uri, errp)) { | |
463 | return; | |
464 | } | |
465 | ||
4111a732 FR |
466 | migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, |
467 | MIGRATION_STATUS_SETUP); | |
468 | ||
e69d50d6 PB |
469 | if (strstart(uri, "tcp:", &p) || |
470 | strstart(uri, "unix:", NULL) || | |
471 | strstart(uri, "vsock:", NULL)) { | |
d658f65c | 472 | socket_start_incoming_migration(p ? p : uri, errp); |
2da776db | 473 | #ifdef CONFIG_RDMA |
adde220a | 474 | } else if (strstart(uri, "rdma:", &p)) { |
b88a3306 JQ |
475 | if (migrate_compress()) { |
476 | error_setg(errp, "RDMA and compression can't be used together"); | |
477 | return; | |
478 | } | |
479 | if (migrate_xbzrle()) { | |
480 | error_setg(errp, "RDMA and XBZRLE can't be used together"); | |
481 | return; | |
482 | } | |
483 | if (migrate_multifd()) { | |
484 | error_setg(errp, "RDMA and multifd can't be used together"); | |
485 | return; | |
486 | } | |
2da776db MH |
487 | rdma_start_incoming_migration(p, errp); |
488 | #endif | |
adde220a | 489 | } else if (strstart(uri, "exec:", &p)) { |
43eaae28 | 490 | exec_start_incoming_migration(p, errp); |
adde220a | 491 | } else if (strstart(uri, "fd:", &p)) { |
43eaae28 | 492 | fd_start_incoming_migration(p, errp); |
2a9e2e59 SS |
493 | } else if (strstart(uri, "file:", &p)) { |
494 | file_start_incoming_migration(p, errp); | |
adde220a | 495 | } else { |
312fd5f2 | 496 | error_setg(errp, "unknown migration protocol: %s", uri); |
8ca5e801 | 497 | } |
5bb7910a AL |
498 | } |
499 | ||
0aa6aefc DL |
500 | static void process_incoming_migration_bh(void *opaque) |
501 | { | |
502 | Error *local_err = NULL; | |
503 | MigrationIncomingState *mis = opaque; | |
504 | ||
3e5f3bcd PX |
505 | trace_vmstate_downtime_checkpoint("dst-precopy-bh-enter"); |
506 | ||
0f073f44 DDAG |
507 | /* If capability late_block_activate is set: |
508 | * Only fire up the block code now if we're going to restart the | |
509 | * VM, else 'cont' will do it. | |
510 | * This causes file locking to happen; so we don't want it to happen | |
511 | * unless we really are starting the VM. | |
512 | */ | |
513 | if (!migrate_late_block_activate() || | |
514 | (autostart && (!global_state_received() || | |
515 | global_state_get_runstate() == RUN_STATE_RUNNING))) { | |
3b717194 | 516 | /* Make sure all file formats throw away their mutable metadata. |
0f073f44 | 517 | * If we get an error here, just don't restart the VM yet. */ |
3b717194 | 518 | bdrv_activate_all(&local_err); |
0f073f44 DDAG |
519 | if (local_err) { |
520 | error_report_err(local_err); | |
521 | local_err = NULL; | |
522 | autostart = false; | |
523 | } | |
d35ff5e6 KW |
524 | } |
525 | ||
0aa6aefc DL |
526 | /* |
527 | * This must happen after all error conditions are dealt with and | |
528 | * we're sure the VM is going to be running on this host. | |
529 | */ | |
7659505c | 530 | qemu_announce_self(&mis->announce_timer, migrate_announce_params()); |
0aa6aefc | 531 | |
3e5f3bcd PX |
532 | trace_vmstate_downtime_checkpoint("dst-precopy-bh-announced"); |
533 | ||
cfc3bcf3 | 534 | multifd_load_shutdown(); |
0aa6aefc | 535 | |
b35ebdf0 VSO |
536 | dirty_bitmap_mig_before_vm_start(); |
537 | ||
0aa6aefc DL |
538 | if (!global_state_received() || |
539 | global_state_get_runstate() == RUN_STATE_RUNNING) { | |
540 | if (autostart) { | |
541 | vm_start(); | |
542 | } else { | |
543 | runstate_set(RUN_STATE_PAUSED); | |
544 | } | |
db009729 ZC |
545 | } else if (migration_incoming_colo_enabled()) { |
546 | migration_incoming_disable_colo(); | |
547 | vm_start(); | |
0aa6aefc DL |
548 | } else { |
549 | runstate_set(global_state_get_runstate()); | |
550 | } | |
3e5f3bcd | 551 | trace_vmstate_downtime_checkpoint("dst-precopy-bh-vm-started"); |
0aa6aefc DL |
552 | /* |
553 | * This must happen after any state changes since as soon as an external | |
554 | * observer sees this event they might start to prod at the VM assuming | |
555 | * it's ready to use. | |
556 | */ | |
557 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
558 | MIGRATION_STATUS_COMPLETED); | |
559 | qemu_bh_delete(mis->bh); | |
560 | migration_incoming_state_destroy(); | |
561 | } | |
562 | ||
38e8f9af MAL |
563 | static void coroutine_fn |
564 | process_incoming_migration_co(void *opaque) | |
511c0231 | 565 | { |
b4b076da | 566 | MigrationIncomingState *mis = migration_incoming_get_current(); |
e9bef235 | 567 | PostcopyState ps; |
1c12e1f5 PB |
568 | int ret; |
569 | ||
4f0fae7f | 570 | assert(mis->from_src_file); |
c323518a LS |
571 | |
572 | if (compress_threads_load_setup(mis->from_src_file)) { | |
573 | error_report("Failed to setup decompress threads"); | |
574 | goto fail; | |
575 | } | |
576 | ||
67f11b5c | 577 | mis->largest_page_size = qemu_ram_pagesize_largest(); |
093e3c42 | 578 | postcopy_state_set(POSTCOPY_INCOMING_NONE); |
4111a732 | 579 | migrate_set_state(&mis->state, MIGRATION_STATUS_SETUP, |
93d7af6f | 580 | MIGRATION_STATUS_ACTIVE); |
dd42ce24 VSO |
581 | |
582 | mis->loadvm_co = qemu_coroutine_self(); | |
4f0fae7f | 583 | ret = qemu_loadvm_state(mis->from_src_file); |
dd42ce24 | 584 | mis->loadvm_co = NULL; |
bca7856a | 585 | |
3e5f3bcd PX |
586 | trace_vmstate_downtime_checkpoint("dst-precopy-loadvm-completed"); |
587 | ||
e9bef235 DDAG |
588 | ps = postcopy_state_get(); |
589 | trace_process_incoming_migration_co_end(ret, ps); | |
590 | if (ps != POSTCOPY_INCOMING_NONE) { | |
591 | if (ps == POSTCOPY_INCOMING_ADVISE) { | |
592 | /* | |
593 | * Where a migration had postcopy enabled (and thus went to advise) | |
594 | * but managed to complete within the precopy period, we can use | |
595 | * the normal exit. | |
596 | */ | |
597 | postcopy_ram_incoming_cleanup(mis); | |
598 | } else if (ret >= 0) { | |
599 | /* | |
600 | * Postcopy was started, cleanup should happen at the end of the | |
601 | * postcopy thread. | |
602 | */ | |
603 | trace_process_incoming_migration_co_postcopy_end_main(); | |
604 | return; | |
605 | } | |
606 | /* Else if something went wrong then just fall out of the normal exit */ | |
607 | } | |
608 | ||
ecbfec6d VSO |
609 | if (ret < 0) { |
610 | error_report("load of migration failed: %s", strerror(-ret)); | |
611 | goto fail; | |
612 | } | |
613 | ||
d0a14a2b VSO |
614 | if (colo_incoming_co() < 0) { |
615 | goto fail; | |
25d0c16f HZ |
616 | } |
617 | ||
0aa6aefc DL |
618 | mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); |
619 | qemu_bh_schedule(mis->bh); | |
6d99c2d4 FL |
620 | return; |
621 | fail: | |
6d99c2d4 FL |
622 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, |
623 | MIGRATION_STATUS_FAILED); | |
624 | qemu_fclose(mis->from_src_file); | |
e5bac1f5 LB |
625 | |
626 | multifd_load_cleanup(); | |
c323518a | 627 | compress_threads_load_cleanup(); |
e5bac1f5 | 628 | |
6d99c2d4 | 629 | exit(EXIT_FAILURE); |
511c0231 JQ |
630 | } |
631 | ||
b673eab4 | 632 | /** |
7d6f6933 | 633 | * migration_incoming_setup: Setup incoming migration |
b673eab4 JQ |
634 | * @f: file for main migration channel |
635 | * @errp: where to put errors | |
7d6f6933 MA |
636 | * |
637 | * Returns: %true on success, %false on error. | |
b673eab4 | 638 | */ |
7d6f6933 | 639 | static bool migration_incoming_setup(QEMUFile *f, Error **errp) |
82a4da79 | 640 | { |
4f0fae7f | 641 | MigrationIncomingState *mis = migration_incoming_get_current(); |
82a4da79 | 642 | |
4f0fae7f JQ |
643 | if (!mis->from_src_file) { |
644 | mis->from_src_file = f; | |
645 | } | |
06ad5135 | 646 | qemu_file_set_blocking(f, false); |
7d6f6933 | 647 | return true; |
e595a01a JQ |
648 | } |
649 | ||
36c2f8be | 650 | void migration_incoming_process(void) |
e595a01a JQ |
651 | { |
652 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL); | |
0b8b8753 | 653 | qemu_coroutine_enter(co); |
82a4da79 PB |
654 | } |
655 | ||
884835fa | 656 | /* Returns true if recovered from a paused migration, otherwise false */ |
a39e9339 | 657 | static bool postcopy_try_recover(void) |
e595a01a | 658 | { |
d96c9e8d PX |
659 | MigrationIncomingState *mis = migration_incoming_get_current(); |
660 | ||
661 | if (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
662 | /* Resumed from a paused postcopy migration */ | |
663 | ||
a39e9339 PX |
664 | /* This should be set already in migration_incoming_setup() */ |
665 | assert(mis->from_src_file); | |
d96c9e8d | 666 | /* Postcopy has standalone thread to do vm load */ |
a39e9339 | 667 | qemu_file_set_blocking(mis->from_src_file, true); |
d96c9e8d PX |
668 | |
669 | /* Re-configure the return path */ | |
a39e9339 | 670 | mis->to_src_file = qemu_file_get_return_path(mis->from_src_file); |
d96c9e8d PX |
671 | |
672 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_PAUSED, | |
673 | MIGRATION_STATUS_POSTCOPY_RECOVER); | |
674 | ||
675 | /* | |
676 | * Here, we only wake up the main loading thread (while the | |
60bb3c58 | 677 | * rest threads will still be waiting), so that we can receive |
d96c9e8d | 678 | * commands from source now, and answer it if needed. The |
60bb3c58 | 679 | * rest threads will be woken up afterwards until we are sure |
d96c9e8d PX |
680 | * that source is ready to reply to page requests. |
681 | */ | |
682 | qemu_sem_post(&mis->postcopy_pause_sem_dst); | |
884835fa PX |
683 | return true; |
684 | } | |
685 | ||
686 | return false; | |
687 | } | |
688 | ||
b673eab4 | 689 | void migration_fd_process_incoming(QEMUFile *f, Error **errp) |
884835fa | 690 | { |
a39e9339 | 691 | if (!migration_incoming_setup(f, errp)) { |
884835fa | 692 | return; |
d96c9e8d | 693 | } |
a39e9339 | 694 | if (postcopy_try_recover()) { |
b673eab4 JQ |
695 | return; |
696 | } | |
884835fa | 697 | migration_incoming_process(); |
e595a01a JQ |
698 | } |
699 | ||
5655aab0 PX |
700 | /* |
701 | * Returns true when we want to start a new incoming migration process, | |
702 | * false otherwise. | |
703 | */ | |
704 | static bool migration_should_start_incoming(bool main_channel) | |
705 | { | |
706 | /* Multifd doesn't start unless all channels are established */ | |
51b07548 | 707 | if (migrate_multifd()) { |
5655aab0 PX |
708 | return migration_has_all_channels(); |
709 | } | |
710 | ||
711 | /* Preempt channel only starts when the main channel is created */ | |
712 | if (migrate_postcopy_preempt()) { | |
713 | return main_channel; | |
714 | } | |
715 | ||
716 | /* | |
717 | * For all the rest types of migration, we should only reach here when | |
718 | * it's the main channel that's being created, and we should always | |
719 | * proceed with this channel. | |
720 | */ | |
721 | assert(main_channel); | |
722 | return true; | |
723 | } | |
724 | ||
49ed0d24 | 725 | void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp) |
4f0fae7f JQ |
726 | { |
727 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
b673eab4 | 728 | Error *local_err = NULL; |
36f62f11 | 729 | QEMUFile *f; |
6720c2b3 | 730 | bool default_channel = true; |
731 | uint32_t channel_magic = 0; | |
732 | int ret = 0; | |
4f0fae7f | 733 | |
51b07548 | 734 | if (migrate_multifd() && !migrate_postcopy_ram() && |
6720c2b3 | 735 | qio_channel_has_feature(ioc, QIO_CHANNEL_FEATURE_READ_MSG_PEEK)) { |
736 | /* | |
737 | * With multiple channels, it is possible that we receive channels | |
738 | * out of order on destination side, causing incorrect mapping of | |
739 | * source channels on destination side. Check channel MAGIC to | |
740 | * decide type of channel. Please note this is best effort, postcopy | |
741 | * preempt channel does not send any magic number so avoid it for | |
742 | * postcopy live migration. Also tls live migration already does | |
743 | * tls handshake while initializing main channel so with tls this | |
744 | * issue is not possible. | |
745 | */ | |
746 | ret = migration_channel_read_peek(ioc, (void *)&channel_magic, | |
747 | sizeof(channel_magic), &local_err); | |
748 | ||
749 | if (ret != 0) { | |
750 | error_propagate(errp, local_err); | |
751 | return; | |
752 | } | |
753 | ||
754 | default_channel = (channel_magic == cpu_to_be32(QEMU_VM_FILE_MAGIC)); | |
755 | } else { | |
756 | default_channel = !mis->from_src_file; | |
757 | } | |
758 | ||
759 | if (multifd_load_setup(errp) != 0) { | |
760 | error_setg(errp, "Failed to setup multifd channels"); | |
761 | return; | |
762 | } | |
763 | ||
764 | if (default_channel) { | |
36f62f11 | 765 | f = qemu_file_new_input(ioc); |
a429e7f4 | 766 | |
7d6f6933 | 767 | if (!migration_incoming_setup(f, errp)) { |
b673eab4 JQ |
768 | return; |
769 | } | |
a429e7f4 PX |
770 | } else { |
771 | /* Multiple connections */ | |
36f62f11 | 772 | assert(migration_needs_multiple_sockets()); |
51b07548 | 773 | if (migrate_multifd()) { |
6720c2b3 | 774 | multifd_recv_new_channel(ioc, &local_err); |
36f62f11 PX |
775 | } else { |
776 | assert(migrate_postcopy_preempt()); | |
777 | f = qemu_file_new_input(ioc); | |
6720c2b3 | 778 | postcopy_preempt_new_channel(mis, f); |
36f62f11 | 779 | } |
49ed0d24 FL |
780 | if (local_err) { |
781 | error_propagate(errp, local_err); | |
782 | return; | |
783 | } | |
4f0fae7f | 784 | } |
81e62053 | 785 | |
5655aab0 | 786 | if (migration_should_start_incoming(default_channel)) { |
a39e9339 PX |
787 | /* If it's a recovery, we're done */ |
788 | if (postcopy_try_recover()) { | |
789 | return; | |
790 | } | |
81e62053 PX |
791 | migration_incoming_process(); |
792 | } | |
4f0fae7f JQ |
793 | } |
794 | ||
428d8908 JQ |
795 | /** |
796 | * @migration_has_all_channels: We have received all channels that we need | |
797 | * | |
798 | * Returns true when we have got connections to all the channels that | |
799 | * we need for migration. | |
800 | */ | |
801 | bool migration_has_all_channels(void) | |
802 | { | |
ca273df3 | 803 | MigrationIncomingState *mis = migration_incoming_get_current(); |
62c1e0ca | 804 | |
36f62f11 PX |
805 | if (!mis->from_src_file) { |
806 | return false; | |
807 | } | |
62c1e0ca | 808 | |
51b07548 | 809 | if (migrate_multifd()) { |
36f62f11 PX |
810 | return multifd_recv_all_channels_created(); |
811 | } | |
812 | ||
813 | if (migrate_postcopy_preempt()) { | |
814 | return mis->postcopy_qemufile_dst != NULL; | |
815 | } | |
816 | ||
817 | return true; | |
428d8908 JQ |
818 | } |
819 | ||
1b4adb10 AH |
820 | int migrate_send_rp_switchover_ack(MigrationIncomingState *mis) |
821 | { | |
822 | return migrate_send_rp_message(mis, MIG_RP_MSG_SWITCHOVER_ACK, 0, NULL); | |
823 | } | |
824 | ||
6decec93 DDAG |
825 | /* |
826 | * Send a 'SHUT' message on the return channel with the given value | |
827 | * to indicate that we've finished with the RP. Non-0 value indicates | |
828 | * error. | |
829 | */ | |
830 | void migrate_send_rp_shut(MigrationIncomingState *mis, | |
831 | uint32_t value) | |
832 | { | |
833 | uint32_t buf; | |
834 | ||
835 | buf = cpu_to_be32(value); | |
836 | migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); | |
837 | } | |
838 | ||
839 | /* | |
840 | * Send a 'PONG' message on the return channel with the given value | |
841 | * (normally in response to a 'PING') | |
842 | */ | |
843 | void migrate_send_rp_pong(MigrationIncomingState *mis, | |
844 | uint32_t value) | |
845 | { | |
846 | uint32_t buf; | |
847 | ||
848 | buf = cpu_to_be32(value); | |
849 | migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); | |
850 | } | |
851 | ||
a335debb PX |
852 | void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis, |
853 | char *block_name) | |
854 | { | |
855 | char buf[512]; | |
856 | int len; | |
857 | int64_t res; | |
858 | ||
859 | /* | |
860 | * First, we send the header part. It contains only the len of | |
861 | * idstr, and the idstr itself. | |
862 | */ | |
863 | len = strlen(block_name); | |
864 | buf[0] = len; | |
865 | memcpy(buf + 1, block_name, len); | |
866 | ||
867 | if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
868 | error_report("%s: MSG_RP_RECV_BITMAP only used for recovery", | |
869 | __func__); | |
870 | return; | |
871 | } | |
872 | ||
873 | migrate_send_rp_message(mis, MIG_RP_MSG_RECV_BITMAP, len + 1, buf); | |
874 | ||
875 | /* | |
876 | * Next, we dump the received bitmap to the stream. | |
877 | * | |
878 | * TODO: currently we are safe since we are the only one that is | |
879 | * using the to_src_file handle (fault thread is still paused), | |
880 | * and it's ok even not taking the mutex. However the best way is | |
881 | * to take the lock before sending the message header, and release | |
882 | * the lock after sending the bitmap. | |
883 | */ | |
884 | qemu_mutex_lock(&mis->rp_mutex); | |
885 | res = ramblock_recv_bitmap_send(mis->to_src_file, block_name); | |
886 | qemu_mutex_unlock(&mis->rp_mutex); | |
887 | ||
888 | trace_migrate_send_rp_recv_bitmap(block_name, res); | |
889 | } | |
890 | ||
13955b89 PX |
891 | void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value) |
892 | { | |
893 | uint32_t buf; | |
894 | ||
895 | buf = cpu_to_be32(value); | |
896 | migrate_send_rp_message(mis, MIG_RP_MSG_RESUME_ACK, sizeof(buf), &buf); | |
897 | } | |
898 | ||
f6844b99 DDAG |
899 | /* |
900 | * Return true if we're already in the middle of a migration | |
901 | * (i.e. any of the active or setup states) | |
902 | */ | |
3d63da16 | 903 | bool migration_is_setup_or_active(int state) |
f6844b99 DDAG |
904 | { |
905 | switch (state) { | |
906 | case MIGRATION_STATUS_ACTIVE: | |
9ec055ae | 907 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
a688d2c1 | 908 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
135b87b4 | 909 | case MIGRATION_STATUS_POSTCOPY_RECOVER: |
f6844b99 | 910 | case MIGRATION_STATUS_SETUP: |
31e06077 DDAG |
911 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
912 | case MIGRATION_STATUS_DEVICE: | |
c7e0acd5 | 913 | case MIGRATION_STATUS_WAIT_UNPLUG: |
19dd408a | 914 | case MIGRATION_STATUS_COLO: |
f6844b99 DDAG |
915 | return true; |
916 | ||
917 | default: | |
918 | return false; | |
919 | ||
920 | } | |
921 | } | |
922 | ||
392d87e2 JQ |
923 | bool migration_is_running(int state) |
924 | { | |
925 | switch (state) { | |
926 | case MIGRATION_STATUS_ACTIVE: | |
927 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
928 | case MIGRATION_STATUS_POSTCOPY_PAUSED: | |
929 | case MIGRATION_STATUS_POSTCOPY_RECOVER: | |
930 | case MIGRATION_STATUS_SETUP: | |
931 | case MIGRATION_STATUS_PRE_SWITCHOVER: | |
932 | case MIGRATION_STATUS_DEVICE: | |
933 | case MIGRATION_STATUS_WAIT_UNPLUG: | |
934 | case MIGRATION_STATUS_CANCELLING: | |
392d87e2 JQ |
935 | return true; |
936 | ||
937 | default: | |
938 | return false; | |
939 | ||
940 | } | |
941 | } | |
942 | ||
db18dee7 PX |
943 | static bool migrate_show_downtime(MigrationState *s) |
944 | { | |
945 | return (s->state == MIGRATION_STATUS_COMPLETED) || migration_in_postcopy(); | |
946 | } | |
947 | ||
640dfb14 WY |
948 | static void populate_time_info(MigrationInfo *info, MigrationState *s) |
949 | { | |
950 | info->has_status = true; | |
951 | info->has_setup_time = true; | |
952 | info->setup_time = s->setup_time; | |
db18dee7 | 953 | |
640dfb14 WY |
954 | if (s->state == MIGRATION_STATUS_COMPLETED) { |
955 | info->has_total_time = true; | |
956 | info->total_time = s->total_time; | |
640dfb14 WY |
957 | } else { |
958 | info->has_total_time = true; | |
959 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - | |
960 | s->start_time; | |
db18dee7 PX |
961 | } |
962 | ||
963 | if (migrate_show_downtime(s)) { | |
964 | info->has_downtime = true; | |
965 | info->downtime = s->downtime; | |
966 | } else { | |
640dfb14 WY |
967 | info->has_expected_downtime = true; |
968 | info->expected_downtime = s->expected_downtime; | |
969 | } | |
970 | } | |
971 | ||
a22463a5 DDAG |
972 | static void populate_ram_info(MigrationInfo *info, MigrationState *s) |
973 | { | |
144fa06b JQ |
974 | size_t page_size = qemu_target_page_size(); |
975 | ||
a22463a5 | 976 | info->ram = g_malloc0(sizeof(*info->ram)); |
897fd8bd | 977 | info->ram->transferred = migration_transferred_bytes(); |
a22463a5 | 978 | info->ram->total = ram_bytes_total(); |
aff3f660 | 979 | info->ram->duplicate = stat64_get(&mig_stats.zero_pages); |
bedf53c1 JQ |
980 | /* legacy value. It is not used anymore */ |
981 | info->ram->skipped = 0; | |
aff3f660 | 982 | info->ram->normal = stat64_get(&mig_stats.normal_pages); |
23b7576d | 983 | info->ram->normal_bytes = info->ram->normal * page_size; |
a22463a5 | 984 | info->ram->mbps = s->mbps; |
536b5a4e | 985 | info->ram->dirty_sync_count = |
aff3f660 | 986 | stat64_get(&mig_stats.dirty_sync_count); |
cf20c897 | 987 | info->ram->dirty_sync_missed_zero_copy = |
aff3f660 | 988 | stat64_get(&mig_stats.dirty_sync_missed_zero_copy); |
3c764f9b | 989 | info->ram->postcopy_requests = |
aff3f660 | 990 | stat64_get(&mig_stats.postcopy_requests); |
144fa06b | 991 | info->ram->page_size = page_size; |
aff3f660 | 992 | info->ram->multifd_bytes = stat64_get(&mig_stats.multifd_bytes); |
aecbfe9c | 993 | info->ram->pages_per_second = s->pages_per_second; |
aff3f660 JQ |
994 | info->ram->precopy_bytes = stat64_get(&mig_stats.precopy_bytes); |
995 | info->ram->downtime_bytes = stat64_get(&mig_stats.downtime_bytes); | |
996 | info->ram->postcopy_bytes = stat64_get(&mig_stats.postcopy_bytes); | |
a22463a5 | 997 | |
87dca0c9 | 998 | if (migrate_xbzrle()) { |
114f5aee JQ |
999 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); |
1000 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
9360447d JQ |
1001 | info->xbzrle_cache->bytes = xbzrle_counters.bytes; |
1002 | info->xbzrle_cache->pages = xbzrle_counters.pages; | |
1003 | info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss; | |
1004 | info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate; | |
e460a4b1 | 1005 | info->xbzrle_cache->encoding_rate = xbzrle_counters.encoding_rate; |
9360447d | 1006 | info->xbzrle_cache->overflow = xbzrle_counters.overflow; |
114f5aee JQ |
1007 | } |
1008 | ||
6f609005 | 1009 | populate_compress(info); |
76e03000 | 1010 | |
338182c8 JQ |
1011 | if (cpu_throttle_active()) { |
1012 | info->has_cpu_throttle_percentage = true; | |
1013 | info->cpu_throttle_percentage = cpu_throttle_get_percentage(); | |
1014 | } | |
1015 | ||
a22463a5 DDAG |
1016 | if (s->state != MIGRATION_STATUS_COMPLETED) { |
1017 | info->ram->remaining = ram_bytes_remaining(); | |
72f8e587 | 1018 | info->ram->dirty_pages_rate = |
aff3f660 | 1019 | stat64_get(&mig_stats.dirty_pages_rate); |
a22463a5 | 1020 | } |
15699cf5 HH |
1021 | |
1022 | if (migrate_dirty_limit() && dirtylimit_in_service()) { | |
1023 | info->has_dirty_limit_throttle_time_per_round = true; | |
1024 | info->dirty_limit_throttle_time_per_round = | |
1025 | dirtylimit_throttle_time_per_round(); | |
1026 | ||
1027 | info->has_dirty_limit_ring_full_time = true; | |
1028 | info->dirty_limit_ring_full_time = dirtylimit_ring_full_time(); | |
1029 | } | |
a22463a5 DDAG |
1030 | } |
1031 | ||
930ac04c JQ |
1032 | static void populate_disk_info(MigrationInfo *info) |
1033 | { | |
1034 | if (blk_mig_active()) { | |
930ac04c JQ |
1035 | info->disk = g_malloc0(sizeof(*info->disk)); |
1036 | info->disk->transferred = blk_mig_bytes_transferred(); | |
1037 | info->disk->remaining = blk_mig_bytes_remaining(); | |
1038 | info->disk->total = blk_mig_bytes_total(); | |
1039 | } | |
1040 | } | |
1041 | ||
65ace060 | 1042 | static void fill_source_migration_info(MigrationInfo *info) |
5bb7910a | 1043 | { |
17549e84 | 1044 | MigrationState *s = migrate_get_current(); |
552de79b | 1045 | int state = qatomic_read(&s->state); |
372043f3 | 1046 | GSList *cur_blocker = migration_blockers; |
17549e84 | 1047 | |
3af8554b | 1048 | info->blocked_reasons = NULL; |
3af8554b | 1049 | |
372043f3 MA |
1050 | /* |
1051 | * There are two types of reasons a migration might be blocked; | |
1052 | * a) devices marked in VMState as non-migratable, and | |
1053 | * b) Explicit migration blockers | |
1054 | * We need to add both of them here. | |
1055 | */ | |
1056 | qemu_savevm_non_migratable_list(&info->blocked_reasons); | |
3af8554b | 1057 | |
372043f3 MA |
1058 | while (cur_blocker) { |
1059 | QAPI_LIST_PREPEND(info->blocked_reasons, | |
1060 | g_strdup(error_get_pretty(cur_blocker->data))); | |
1061 | cur_blocker = g_slist_next(cur_blocker); | |
3af8554b | 1062 | } |
372043f3 | 1063 | info->has_blocked_reasons = info->blocked_reasons != NULL; |
3af8554b | 1064 | |
552de79b | 1065 | switch (state) { |
31194731 | 1066 | case MIGRATION_STATUS_NONE: |
17549e84 | 1067 | /* no migration has happened ever */ |
65ace060 AP |
1068 | /* do not overwrite destination migration status */ |
1069 | return; | |
31194731 | 1070 | case MIGRATION_STATUS_SETUP: |
29ae8a41 | 1071 | info->has_status = true; |
ed4fbd10 | 1072 | info->has_total_time = false; |
29ae8a41 | 1073 | break; |
31194731 HZ |
1074 | case MIGRATION_STATUS_ACTIVE: |
1075 | case MIGRATION_STATUS_CANCELLING: | |
9ec055ae | 1076 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
31e06077 DDAG |
1077 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
1078 | case MIGRATION_STATUS_DEVICE: | |
a688d2c1 | 1079 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
135b87b4 | 1080 | case MIGRATION_STATUS_POSTCOPY_RECOVER: |
640dfb14 WY |
1081 | /* TODO add some postcopy stats */ |
1082 | populate_time_info(info, s); | |
a22463a5 | 1083 | populate_ram_info(info, s); |
930ac04c | 1084 | populate_disk_info(info); |
38c482b4 | 1085 | migration_populate_vfio_info(info); |
17549e84 | 1086 | break; |
0b827d5e HZ |
1087 | case MIGRATION_STATUS_COLO: |
1088 | info->has_status = true; | |
1089 | /* TODO: display COLO specific information (checkpoint info etc.) */ | |
1090 | break; | |
31194731 | 1091 | case MIGRATION_STATUS_COMPLETED: |
640dfb14 | 1092 | populate_time_info(info, s); |
a22463a5 | 1093 | populate_ram_info(info, s); |
38c482b4 | 1094 | migration_populate_vfio_info(info); |
17549e84 | 1095 | break; |
31194731 | 1096 | case MIGRATION_STATUS_FAILED: |
791e7c82 | 1097 | info->has_status = true; |
17549e84 | 1098 | break; |
31194731 | 1099 | case MIGRATION_STATUS_CANCELLED: |
791e7c82 | 1100 | info->has_status = true; |
17549e84 | 1101 | break; |
c7e0acd5 JF |
1102 | case MIGRATION_STATUS_WAIT_UNPLUG: |
1103 | info->has_status = true; | |
1104 | break; | |
5bb7910a | 1105 | } |
552de79b | 1106 | info->status = state; |
c94143e5 PX |
1107 | |
1108 | QEMU_LOCK_GUARD(&s->error_mutex); | |
1109 | if (s->error) { | |
1110 | info->error_desc = g_strdup(error_get_pretty(s->error)); | |
1111 | } | |
5bb7910a AL |
1112 | } |
1113 | ||
65ace060 AP |
1114 | static void fill_destination_migration_info(MigrationInfo *info) |
1115 | { | |
1116 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
1117 | ||
9aca82ba JQ |
1118 | if (mis->socket_address_list) { |
1119 | info->has_socket_address = true; | |
1120 | info->socket_address = | |
1121 | QAPI_CLONE(SocketAddressList, mis->socket_address_list); | |
1122 | } | |
1123 | ||
65ace060 AP |
1124 | switch (mis->state) { |
1125 | case MIGRATION_STATUS_NONE: | |
1126 | return; | |
65ace060 AP |
1127 | case MIGRATION_STATUS_SETUP: |
1128 | case MIGRATION_STATUS_CANCELLING: | |
1129 | case MIGRATION_STATUS_CANCELLED: | |
1130 | case MIGRATION_STATUS_ACTIVE: | |
1131 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
3c9928d9 PX |
1132 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
1133 | case MIGRATION_STATUS_POSTCOPY_RECOVER: | |
65ace060 AP |
1134 | case MIGRATION_STATUS_FAILED: |
1135 | case MIGRATION_STATUS_COLO: | |
1136 | info->has_status = true; | |
1137 | break; | |
1138 | case MIGRATION_STATUS_COMPLETED: | |
1139 | info->has_status = true; | |
1140 | fill_destination_postcopy_migration_info(info); | |
1141 | break; | |
1142 | } | |
1143 | info->status = mis->state; | |
1144 | } | |
1145 | ||
1146 | MigrationInfo *qmp_query_migrate(Error **errp) | |
1147 | { | |
1148 | MigrationInfo *info = g_malloc0(sizeof(*info)); | |
1149 | ||
1150 | fill_destination_migration_info(info); | |
1151 | fill_source_migration_info(info); | |
1152 | ||
1153 | return info; | |
1154 | } | |
1155 | ||
4886a1bc DDAG |
1156 | void qmp_migrate_start_postcopy(Error **errp) |
1157 | { | |
1158 | MigrationState *s = migrate_get_current(); | |
1159 | ||
16b0fd32 | 1160 | if (!migrate_postcopy()) { |
a54d340b | 1161 | error_setg(errp, "Enable postcopy with migrate_set_capability before" |
4886a1bc DDAG |
1162 | " the start of migration"); |
1163 | return; | |
1164 | } | |
1165 | ||
1166 | if (s->state == MIGRATION_STATUS_NONE) { | |
1167 | error_setg(errp, "Postcopy must be started after migration has been" | |
1168 | " started"); | |
1169 | return; | |
1170 | } | |
1171 | /* | |
1172 | * we don't error if migration has finished since that would be racy | |
1173 | * with issuing this command. | |
1174 | */ | |
d73415a3 | 1175 | qatomic_set(&s->start_postcopy, true); |
4886a1bc DDAG |
1176 | } |
1177 | ||
065e2813 AL |
1178 | /* shared migration helpers */ |
1179 | ||
48781e5b | 1180 | void migrate_set_state(int *state, int old_state, int new_state) |
51cf4c1a | 1181 | { |
a31fedee | 1182 | assert(new_state < MIGRATION_STATUS__MAX); |
d73415a3 | 1183 | if (qatomic_cmpxchg(state, old_state, new_state) == old_state) { |
a31fedee | 1184 | trace_migrate_set_state(MigrationStatus_str(new_state)); |
b05dc723 | 1185 | migrate_generate_event(new_state); |
51cf4c1a Z |
1186 | } |
1187 | } | |
1188 | ||
fd392cfa | 1189 | static void migrate_fd_cleanup(MigrationState *s) |
065e2813 | 1190 | { |
bb1fadc4 PB |
1191 | qemu_bh_delete(s->cleanup_bh); |
1192 | s->cleanup_bh = NULL; | |
1193 | ||
83174765 PX |
1194 | g_free(s->hostname); |
1195 | s->hostname = NULL; | |
e3bf5e68 DH |
1196 | json_writer_free(s->vmdesc); |
1197 | s->vmdesc = NULL; | |
83174765 | 1198 | |
0ceccd85 PX |
1199 | qemu_savevm_state_cleanup(); |
1200 | ||
89a02a9f | 1201 | if (s->to_dst_file) { |
62df066f | 1202 | QEMUFile *tmp; |
f986c3d2 | 1203 | |
9013dca5 | 1204 | trace_migrate_fd_cleanup(); |
404a7c05 | 1205 | qemu_mutex_unlock_iothread(); |
1d34e4bf DDAG |
1206 | if (s->migration_thread_running) { |
1207 | qemu_thread_join(&s->thread); | |
1208 | s->migration_thread_running = false; | |
1209 | } | |
404a7c05 PB |
1210 | qemu_mutex_lock_iothread(); |
1211 | ||
1398b2e3 | 1212 | multifd_save_cleanup(); |
62df066f PX |
1213 | qemu_mutex_lock(&s->qemu_file_lock); |
1214 | tmp = s->to_dst_file; | |
89a02a9f | 1215 | s->to_dst_file = NULL; |
62df066f PX |
1216 | qemu_mutex_unlock(&s->qemu_file_lock); |
1217 | /* | |
1218 | * Close the file handle without the lock to make sure the | |
1219 | * critical section won't block for long. | |
1220 | */ | |
39675fff | 1221 | migration_ioc_unregister_yank_from_file(tmp); |
62df066f | 1222 | qemu_fclose(tmp); |
065e2813 AL |
1223 | } |
1224 | ||
36e9aab3 FR |
1225 | /* |
1226 | * We already cleaned up to_dst_file, so errors from the return | |
1227 | * path might be due to that, ignore them. | |
1228 | */ | |
d7f5a043 | 1229 | close_return_path_on_source(s); |
36e9aab3 | 1230 | |
8f8d528e | 1231 | assert(!migration_is_active(s)); |
7a2c1721 | 1232 | |
94f5a437 | 1233 | if (s->state == MIGRATION_STATUS_CANCELLING) { |
48781e5b | 1234 | migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, |
94f5a437 | 1235 | MIGRATION_STATUS_CANCELLED); |
7a2c1721 | 1236 | } |
a3fa1d78 | 1237 | |
87db1a7d JQ |
1238 | if (s->error) { |
1239 | /* It is used on info migrate. We can't free it */ | |
1240 | error_report_err(error_copy(s->error)); | |
1241 | } | |
d9cda213 | 1242 | migration_call_notifiers(s); |
b1a87956 | 1243 | block_cleanup_parameters(); |
b5eea99e | 1244 | yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
065e2813 AL |
1245 | } |
1246 | ||
fd392cfa YK |
1247 | static void migrate_fd_cleanup_schedule(MigrationState *s) |
1248 | { | |
1249 | /* | |
1250 | * Ref the state for bh, because it may be called when | |
1251 | * there're already no other refs | |
1252 | */ | |
1253 | object_ref(OBJECT(s)); | |
1254 | qemu_bh_schedule(s->cleanup_bh); | |
1255 | } | |
1256 | ||
1257 | static void migrate_fd_cleanup_bh(void *opaque) | |
1258 | { | |
1259 | MigrationState *s = opaque; | |
1260 | migrate_fd_cleanup(s); | |
1261 | object_unref(OBJECT(s)); | |
1262 | } | |
1263 | ||
87db1a7d JQ |
1264 | void migrate_set_error(MigrationState *s, const Error *error) |
1265 | { | |
6e8a355d | 1266 | QEMU_LOCK_GUARD(&s->error_mutex); |
87db1a7d JQ |
1267 | if (!s->error) { |
1268 | s->error = error_copy(error); | |
1269 | } | |
87db1a7d JQ |
1270 | } |
1271 | ||
2b2f6f41 PX |
1272 | bool migrate_has_error(MigrationState *s) |
1273 | { | |
1274 | /* The lock is not helpful here, but still follow the rule */ | |
1275 | QEMU_LOCK_GUARD(&s->error_mutex); | |
1276 | return qatomic_read(&s->error); | |
1277 | } | |
1278 | ||
ca7bd082 PX |
1279 | static void migrate_error_free(MigrationState *s) |
1280 | { | |
1281 | QEMU_LOCK_GUARD(&s->error_mutex); | |
1282 | if (s->error) { | |
1283 | error_free(s->error); | |
1284 | s->error = NULL; | |
1285 | } | |
1286 | } | |
1287 | ||
aaf26bd3 | 1288 | static void migrate_fd_error(MigrationState *s, const Error *error) |
065e2813 | 1289 | { |
25174055 | 1290 | trace_migrate_fd_error(error_get_pretty(error)); |
89a02a9f | 1291 | assert(s->to_dst_file == NULL); |
48781e5b HZ |
1292 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1293 | MIGRATION_STATUS_FAILED); | |
87db1a7d | 1294 | migrate_set_error(s, error); |
458cf28e JQ |
1295 | } |
1296 | ||
0edda1c4 | 1297 | static void migrate_fd_cancel(MigrationState *s) |
065e2813 | 1298 | { |
6f2b811a | 1299 | int old_state ; |
7478fb0d | 1300 | |
9013dca5 | 1301 | trace_migrate_fd_cancel(); |
065e2813 | 1302 | |
43044ac0 PX |
1303 | WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) { |
1304 | if (s->rp_state.from_dst_file) { | |
1305 | /* shutdown the rp socket, so causing the rp thread to shutdown */ | |
1306 | qemu_file_shutdown(s->rp_state.from_dst_file); | |
1307 | } | |
70b20477 DDAG |
1308 | } |
1309 | ||
6f2b811a Z |
1310 | do { |
1311 | old_state = s->state; | |
392d87e2 | 1312 | if (!migration_is_running(old_state)) { |
6f2b811a Z |
1313 | break; |
1314 | } | |
a7b36b48 DDAG |
1315 | /* If the migration is paused, kick it out of the pause */ |
1316 | if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) { | |
1317 | qemu_sem_post(&s->pause_sem); | |
1318 | } | |
48781e5b | 1319 | migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); |
31194731 | 1320 | } while (s->state != MIGRATION_STATUS_CANCELLING); |
a26ba26e DDAG |
1321 | |
1322 | /* | |
1323 | * If we're unlucky the migration code might be stuck somewhere in a | |
1324 | * send/write while the network has failed and is waiting to timeout; | |
1325 | * if we've got shutdown(2) available then we can force it to quit. | |
a26ba26e | 1326 | */ |
7478fb0d FR |
1327 | if (s->state == MIGRATION_STATUS_CANCELLING) { |
1328 | WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) { | |
1329 | if (s->to_dst_file) { | |
1330 | qemu_file_shutdown(s->to_dst_file); | |
1331 | } | |
1332 | } | |
a26ba26e | 1333 | } |
1d2acc31 HZ |
1334 | if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) { |
1335 | Error *local_err = NULL; | |
1336 | ||
3b717194 | 1337 | bdrv_activate_all(&local_err); |
1d2acc31 HZ |
1338 | if (local_err) { |
1339 | error_report_err(local_err); | |
1340 | } else { | |
1341 | s->block_inactive = false; | |
1342 | } | |
1343 | } | |
065e2813 AL |
1344 | } |
1345 | ||
d9cda213 SS |
1346 | void migration_add_notifier(Notifier *notify, |
1347 | void (*func)(Notifier *notifier, void *data)) | |
99a0db9b | 1348 | { |
d9cda213 | 1349 | notify->notify = func; |
99a0db9b GH |
1350 | notifier_list_add(&migration_state_notifiers, notify); |
1351 | } | |
1352 | ||
d9cda213 SS |
1353 | void migration_remove_notifier(Notifier *notify) |
1354 | { | |
1355 | if (notify->notify) { | |
1356 | notifier_remove(notify); | |
1357 | notify->notify = NULL; | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | void migration_call_notifiers(MigrationState *s) | |
99a0db9b | 1362 | { |
d9cda213 | 1363 | notifier_list_notify(&migration_state_notifiers, s); |
99a0db9b GH |
1364 | } |
1365 | ||
02edd2e7 | 1366 | bool migration_in_setup(MigrationState *s) |
afe2df69 | 1367 | { |
31194731 | 1368 | return s->state == MIGRATION_STATUS_SETUP; |
afe2df69 GH |
1369 | } |
1370 | ||
7073693b | 1371 | bool migration_has_finished(MigrationState *s) |
99a0db9b | 1372 | { |
31194731 | 1373 | return s->state == MIGRATION_STATUS_COMPLETED; |
99a0db9b | 1374 | } |
0edda1c4 | 1375 | |
afe2df69 GH |
1376 | bool migration_has_failed(MigrationState *s) |
1377 | { | |
31194731 HZ |
1378 | return (s->state == MIGRATION_STATUS_CANCELLED || |
1379 | s->state == MIGRATION_STATUS_FAILED); | |
afe2df69 GH |
1380 | } |
1381 | ||
5727309d | 1382 | bool migration_in_postcopy(void) |
9ec055ae | 1383 | { |
5727309d JQ |
1384 | MigrationState *s = migrate_get_current(); |
1385 | ||
3748fef9 DDAG |
1386 | switch (s->state) { |
1387 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
1388 | case MIGRATION_STATUS_POSTCOPY_PAUSED: | |
1389 | case MIGRATION_STATUS_POSTCOPY_RECOVER: | |
1390 | return true; | |
1391 | default: | |
1392 | return false; | |
1393 | } | |
9ec055ae DDAG |
1394 | } |
1395 | ||
b82fc321 DDAG |
1396 | bool migration_in_postcopy_after_devices(MigrationState *s) |
1397 | { | |
5727309d | 1398 | return migration_in_postcopy() && s->postcopy_after_devices; |
b82fc321 DDAG |
1399 | } |
1400 | ||
06df2e69 DH |
1401 | bool migration_in_incoming_postcopy(void) |
1402 | { | |
1403 | PostcopyState ps = postcopy_state_get(); | |
1404 | ||
1405 | return ps >= POSTCOPY_INCOMING_DISCARD && ps < POSTCOPY_INCOMING_END; | |
1406 | } | |
1407 | ||
80fe315c DH |
1408 | bool migration_incoming_postcopy_advised(void) |
1409 | { | |
1410 | PostcopyState ps = postcopy_state_get(); | |
1411 | ||
1412 | return ps >= POSTCOPY_INCOMING_ADVISE && ps < POSTCOPY_INCOMING_END; | |
1413 | } | |
1414 | ||
1a8e44a8 AG |
1415 | bool migration_in_bg_snapshot(void) |
1416 | { | |
1417 | MigrationState *s = migrate_get_current(); | |
1418 | ||
1419 | return migrate_background_snapshot() && | |
1420 | migration_is_setup_or_active(s->state); | |
1421 | } | |
1422 | ||
fab35005 | 1423 | bool migration_is_idle(void) |
fe44dc91 | 1424 | { |
daff7f0b MA |
1425 | MigrationState *s = current_migration; |
1426 | ||
1427 | if (!s) { | |
1428 | return true; | |
1429 | } | |
fe44dc91 AA |
1430 | |
1431 | switch (s->state) { | |
1432 | case MIGRATION_STATUS_NONE: | |
1433 | case MIGRATION_STATUS_CANCELLED: | |
1434 | case MIGRATION_STATUS_COMPLETED: | |
1435 | case MIGRATION_STATUS_FAILED: | |
1436 | return true; | |
1437 | case MIGRATION_STATUS_SETUP: | |
1438 | case MIGRATION_STATUS_CANCELLING: | |
1439 | case MIGRATION_STATUS_ACTIVE: | |
1440 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
1441 | case MIGRATION_STATUS_COLO: | |
31e06077 DDAG |
1442 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
1443 | case MIGRATION_STATUS_DEVICE: | |
c7e0acd5 | 1444 | case MIGRATION_STATUS_WAIT_UNPLUG: |
fe44dc91 AA |
1445 | return false; |
1446 | case MIGRATION_STATUS__MAX: | |
1447 | g_assert_not_reached(); | |
1448 | } | |
1449 | ||
1450 | return false; | |
1451 | } | |
1452 | ||
8f8d528e WY |
1453 | bool migration_is_active(MigrationState *s) |
1454 | { | |
1455 | return (s->state == MIGRATION_STATUS_ACTIVE || | |
1456 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
1457 | } | |
1458 | ||
08fc4cb5 | 1459 | int migrate_init(MigrationState *s, Error **errp) |
0edda1c4 | 1460 | { |
08fc4cb5 AH |
1461 | int ret; |
1462 | ||
1463 | ret = qemu_savevm_state_prepare(errp); | |
1464 | if (ret) { | |
1465 | return ret; | |
1466 | } | |
1467 | ||
389775d1 DDAG |
1468 | /* |
1469 | * Reinitialise all migration state, except | |
1470 | * parameters/capabilities that the user set, and | |
1471 | * locks. | |
1472 | */ | |
389775d1 | 1473 | s->cleanup_bh = 0; |
8518278a | 1474 | s->vm_start_bh = 0; |
89a02a9f | 1475 | s->to_dst_file = NULL; |
389775d1 | 1476 | s->state = MIGRATION_STATUS_NONE; |
389775d1 DDAG |
1477 | s->rp_state.from_dst_file = NULL; |
1478 | s->rp_state.error = false; | |
1479 | s->mbps = 0.0; | |
aecbfe9c | 1480 | s->pages_per_second = 0.0; |
389775d1 DDAG |
1481 | s->downtime = 0; |
1482 | s->expected_downtime = 0; | |
389775d1 | 1483 | s->setup_time = 0; |
389775d1 | 1484 | s->start_postcopy = false; |
b82fc321 | 1485 | s->postcopy_after_devices = false; |
389775d1 | 1486 | s->migration_thread_running = false; |
d59ce6f3 DB |
1487 | error_free(s->error); |
1488 | s->error = NULL; | |
d8053e73 | 1489 | s->hostname = NULL; |
2aae1eb8 | 1490 | s->vmdesc = NULL; |
389775d1 | 1491 | |
48781e5b | 1492 | migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); |
0edda1c4 | 1493 | |
4af246a3 PX |
1494 | s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
1495 | s->total_time = 0; | |
f4584076 | 1496 | s->vm_old_state = -1; |
b15df1ae PX |
1497 | s->iteration_initial_bytes = 0; |
1498 | s->threshold_size = 0; | |
1b4adb10 | 1499 | s->switchover_acked = false; |
27fd25b0 | 1500 | s->rdma_migration = false; |
f543aa22 | 1501 | /* |
809f188a | 1502 | * set mig_stats memory to zero for a new migration |
f543aa22 AH |
1503 | */ |
1504 | memset(&mig_stats, 0, sizeof(mig_stats)); | |
f543aa22 | 1505 | migration_reset_vfio_bytes_transferred(); |
08fc4cb5 AH |
1506 | |
1507 | return 0; | |
0edda1c4 | 1508 | } |
cab30143 | 1509 | |
c8a7fc51 | 1510 | int migrate_add_blocker_internal(Error **reasonp, Error **errp) |
fa2756b7 | 1511 | { |
4c170330 PX |
1512 | /* Snapshots are similar to migrations, so check RUN_STATE_SAVE_VM too. */ |
1513 | if (runstate_check(RUN_STATE_SAVE_VM) || !migration_is_idle()) { | |
c8a7fc51 | 1514 | error_propagate_prepend(errp, *reasonp, |
4c170330 PX |
1515 | "disallowing migration blocker " |
1516 | "(migration/snapshot in progress) for: "); | |
c8a7fc51 | 1517 | *reasonp = NULL; |
4c170330 | 1518 | return -EBUSY; |
fe44dc91 AA |
1519 | } |
1520 | ||
c8a7fc51 | 1521 | migration_blockers = g_slist_prepend(migration_blockers, *reasonp); |
4c170330 | 1522 | return 0; |
fa2756b7 AL |
1523 | } |
1524 | ||
c8a7fc51 | 1525 | int migrate_add_blocker(Error **reasonp, Error **errp) |
60fd6801 PX |
1526 | { |
1527 | if (only_migratable) { | |
c8a7fc51 | 1528 | error_propagate_prepend(errp, *reasonp, |
60fd6801 PX |
1529 | "disallowing migration blocker " |
1530 | "(--only-migratable) for: "); | |
c8a7fc51 | 1531 | *reasonp = NULL; |
60fd6801 PX |
1532 | return -EACCES; |
1533 | } | |
1534 | ||
c8a7fc51 | 1535 | return migrate_add_blocker_internal(reasonp, errp); |
60fd6801 PX |
1536 | } |
1537 | ||
c8a7fc51 | 1538 | void migrate_del_blocker(Error **reasonp) |
fa2756b7 | 1539 | { |
c8a7fc51 SS |
1540 | if (*reasonp) { |
1541 | migration_blockers = g_slist_remove(migration_blockers, *reasonp); | |
1542 | error_free(*reasonp); | |
1543 | *reasonp = NULL; | |
1544 | } | |
fa2756b7 AL |
1545 | } |
1546 | ||
bf1ae1f4 DDAG |
1547 | void qmp_migrate_incoming(const char *uri, Error **errp) |
1548 | { | |
1549 | Error *local_err = NULL; | |
4debb5f5 | 1550 | static bool once = true; |
bf1ae1f4 | 1551 | |
4debb5f5 DDAG |
1552 | if (!once) { |
1553 | error_setg(errp, "The incoming migration has already been started"); | |
603d5a42 | 1554 | return; |
4debb5f5 | 1555 | } |
e69d50d6 PB |
1556 | if (!runstate_check(RUN_STATE_INMIGRATE)) { |
1557 | error_setg(errp, "'-incoming' was not specified on the command line"); | |
1558 | return; | |
1559 | } | |
bf1ae1f4 | 1560 | |
cc48c587 PX |
1561 | if (!yank_register_instance(MIGRATION_YANK_INSTANCE, errp)) { |
1562 | return; | |
1563 | } | |
1564 | ||
bf1ae1f4 DDAG |
1565 | qemu_start_incoming_migration(uri, &local_err); |
1566 | ||
1567 | if (local_err) { | |
cc48c587 | 1568 | yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
bf1ae1f4 DDAG |
1569 | error_propagate(errp, local_err); |
1570 | return; | |
1571 | } | |
1572 | ||
4debb5f5 | 1573 | once = false; |
bf1ae1f4 DDAG |
1574 | } |
1575 | ||
02affd41 PX |
1576 | void qmp_migrate_recover(const char *uri, Error **errp) |
1577 | { | |
1578 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
1579 | ||
b7f9afd4 PX |
1580 | /* |
1581 | * Don't even bother to use ERRP_GUARD() as it _must_ always be set by | |
1582 | * callers (no one should ignore a recover failure); if there is, it's a | |
1583 | * programming error. | |
1584 | */ | |
1585 | assert(errp); | |
1586 | ||
02affd41 PX |
1587 | if (mis->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { |
1588 | error_setg(errp, "Migrate recover can only be run " | |
1589 | "when postcopy is paused."); | |
1590 | return; | |
1591 | } | |
1592 | ||
08401c04 PX |
1593 | /* If there's an existing transport, release it */ |
1594 | migration_incoming_transport_cleanup(mis); | |
02affd41 PX |
1595 | |
1596 | /* | |
1597 | * Note that this call will never start a real migration; it will | |
1598 | * only re-setup the migration stream and poke existing migration | |
1599 | * to continue using that newly established channel. | |
1600 | */ | |
1601 | qemu_start_incoming_migration(uri, errp); | |
1602 | } | |
1603 | ||
bfbf89c2 PX |
1604 | void qmp_migrate_pause(Error **errp) |
1605 | { | |
1606 | MigrationState *ms = migrate_get_current(); | |
1607 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
7478fb0d | 1608 | int ret = 0; |
bfbf89c2 PX |
1609 | |
1610 | if (ms->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1611 | /* Source side, during postcopy */ | |
1612 | qemu_mutex_lock(&ms->qemu_file_lock); | |
7478fb0d FR |
1613 | if (ms->to_dst_file) { |
1614 | ret = qemu_file_shutdown(ms->to_dst_file); | |
1615 | } | |
bfbf89c2 PX |
1616 | qemu_mutex_unlock(&ms->qemu_file_lock); |
1617 | if (ret) { | |
1618 | error_setg(errp, "Failed to pause source migration"); | |
1619 | } | |
1620 | return; | |
1621 | } | |
1622 | ||
1623 | if (mis->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1624 | ret = qemu_file_shutdown(mis->from_src_file); | |
1625 | if (ret) { | |
1626 | error_setg(errp, "Failed to pause destination migration"); | |
1627 | } | |
1628 | return; | |
1629 | } | |
1630 | ||
1631 | error_setg(errp, "migrate-pause is currently only supported " | |
1632 | "during postcopy-active state"); | |
1633 | } | |
1634 | ||
24f3902b GK |
1635 | bool migration_is_blocked(Error **errp) |
1636 | { | |
1637 | if (qemu_savevm_state_blocked(errp)) { | |
1638 | return true; | |
1639 | } | |
1640 | ||
1641 | if (migration_blockers) { | |
250561e1 | 1642 | error_propagate(errp, error_copy(migration_blockers->data)); |
24f3902b GK |
1643 | return true; |
1644 | } | |
1645 | ||
1646 | return false; | |
1647 | } | |
1648 | ||
d3e35b8f PX |
1649 | /* Returns true if continue to migrate, or false if error detected */ |
1650 | static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc, | |
1651 | bool resume, Error **errp) | |
cab30143 | 1652 | { |
be7059cd | 1653 | Error *local_err = NULL; |
d3e35b8f | 1654 | |
40101f32 JQ |
1655 | if (blk_inc) { |
1656 | warn_report("parameter 'inc' is deprecated;" | |
1657 | " use blockdev-mirror with NBD instead"); | |
1658 | } | |
1659 | ||
8846b5bf JQ |
1660 | if (blk) { |
1661 | warn_report("parameter 'blk' is deprecated;" | |
1662 | " use blockdev-mirror with NBD instead"); | |
1663 | } | |
1664 | ||
d3e35b8f PX |
1665 | if (resume) { |
1666 | if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
1667 | error_setg(errp, "Cannot resume if there is no " | |
1668 | "paused migration"); | |
1669 | return false; | |
1670 | } | |
97ca211c PX |
1671 | |
1672 | /* | |
1673 | * Postcopy recovery won't work well with release-ram | |
1674 | * capability since release-ram will drop the page buffer as | |
1675 | * long as the page is put into the send buffer. So if there | |
1676 | * is a network failure happened, any page buffers that have | |
1677 | * not yet reached the destination VM but have already been | |
1678 | * sent from the source VM will be lost forever. Let's refuse | |
1679 | * the client from resuming such a postcopy migration. | |
1680 | * Luckily release-ram was designed to only be used when src | |
1681 | * and destination VMs are on the same host, so it should be | |
1682 | * fine. | |
1683 | */ | |
1684 | if (migrate_release_ram()) { | |
1685 | error_setg(errp, "Postcopy recovery cannot work " | |
1686 | "when release-ram capability is set"); | |
1687 | return false; | |
1688 | } | |
1689 | ||
d3e35b8f PX |
1690 | /* This is a resume, skip init status */ |
1691 | return true; | |
1692 | } | |
cab30143 | 1693 | |
392d87e2 | 1694 | if (migration_is_running(s->state)) { |
c6bd8c70 | 1695 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
d3e35b8f | 1696 | return false; |
cab30143 | 1697 | } |
d3e35b8f | 1698 | |
ca99993a DDAG |
1699 | if (runstate_check(RUN_STATE_INMIGRATE)) { |
1700 | error_setg(errp, "Guest is waiting for an incoming migration"); | |
d3e35b8f | 1701 | return false; |
ca99993a DDAG |
1702 | } |
1703 | ||
36d0fe65 T |
1704 | if (runstate_check(RUN_STATE_POSTMIGRATE)) { |
1705 | error_setg(errp, "Can't migrate the vm that was paused due to " | |
1706 | "previous migration"); | |
1707 | return false; | |
1708 | } | |
1709 | ||
24f3902b | 1710 | if (migration_is_blocked(errp)) { |
d3e35b8f | 1711 | return false; |
fa2756b7 AL |
1712 | } |
1713 | ||
d3e35b8f | 1714 | if (blk || blk_inc) { |
5e804644 | 1715 | if (migrate_colo()) { |
3ba02445 RL |
1716 | error_setg(errp, "No disk migration is required in COLO mode"); |
1717 | return false; | |
1718 | } | |
6f8be708 | 1719 | if (migrate_block() || migrate_block_incremental()) { |
2833c59b JQ |
1720 | error_setg(errp, "Command options are incompatible with " |
1721 | "current migration capabilities"); | |
d3e35b8f | 1722 | return false; |
2833c59b | 1723 | } |
9eb1109c | 1724 | if (!migrate_cap_set(MIGRATION_CAPABILITY_BLOCK, true, &local_err)) { |
2833c59b | 1725 | error_propagate(errp, local_err); |
d3e35b8f | 1726 | return false; |
2833c59b JQ |
1727 | } |
1728 | s->must_remove_block_options = true; | |
1729 | } | |
1730 | ||
d3e35b8f | 1731 | if (blk_inc) { |
87c22901 | 1732 | migrate_set_block_incremental(true); |
2833c59b JQ |
1733 | } |
1734 | ||
08fc4cb5 AH |
1735 | if (migrate_init(s, errp)) { |
1736 | return false; | |
1737 | } | |
cab30143 | 1738 | |
d3e35b8f PX |
1739 | return true; |
1740 | } | |
1741 | ||
1742 | void qmp_migrate(const char *uri, bool has_blk, bool blk, | |
1743 | bool has_inc, bool inc, bool has_detach, bool detach, | |
1744 | bool has_resume, bool resume, Error **errp) | |
1745 | { | |
8c69ae9e | 1746 | bool resume_requested; |
d3e35b8f PX |
1747 | Error *local_err = NULL; |
1748 | MigrationState *s = migrate_get_current(); | |
d658f65c | 1749 | const char *p = NULL; |
d3e35b8f | 1750 | |
d6f74fd1 PX |
1751 | /* URI is not suitable for migration? */ |
1752 | if (!migration_channels_and_uri_compatible(uri, errp)) { | |
1753 | return; | |
1754 | } | |
1755 | ||
8c69ae9e | 1756 | resume_requested = has_resume && resume; |
d3e35b8f | 1757 | if (!migrate_prepare(s, has_blk && blk, has_inc && inc, |
8c69ae9e | 1758 | resume_requested, errp)) { |
d3e35b8f PX |
1759 | /* Error detected, put into errp */ |
1760 | return; | |
1761 | } | |
1762 | ||
8c69ae9e | 1763 | if (!resume_requested) { |
b5eea99e LS |
1764 | if (!yank_register_instance(MIGRATION_YANK_INSTANCE, errp)) { |
1765 | return; | |
1766 | } | |
1767 | } | |
1768 | ||
d658f65c | 1769 | if (strstart(uri, "tcp:", &p) || |
9ba3b2ba LM |
1770 | strstart(uri, "unix:", NULL) || |
1771 | strstart(uri, "vsock:", NULL)) { | |
d658f65c | 1772 | socket_start_outgoing_migration(s, p ? p : uri, &local_err); |
2da776db | 1773 | #ifdef CONFIG_RDMA |
41310c68 | 1774 | } else if (strstart(uri, "rdma:", &p)) { |
2da776db MH |
1775 | rdma_start_outgoing_migration(s, p, &local_err); |
1776 | #endif | |
cab30143 | 1777 | } else if (strstart(uri, "exec:", &p)) { |
f37afb5a | 1778 | exec_start_outgoing_migration(s, p, &local_err); |
cab30143 | 1779 | } else if (strstart(uri, "fd:", &p)) { |
f37afb5a | 1780 | fd_start_outgoing_migration(s, p, &local_err); |
2a9e2e59 SS |
1781 | } else if (strstart(uri, "file:", &p)) { |
1782 | file_start_outgoing_migration(s, p, &local_err); | |
99a0db9b | 1783 | } else { |
908927db | 1784 | error_setg(&local_err, QERR_INVALID_PARAMETER_VALUE, "uri", |
c6bd8c70 | 1785 | "a valid migration protocol"); |
48781e5b HZ |
1786 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1787 | MIGRATION_STATUS_FAILED); | |
b1a87956 | 1788 | block_cleanup_parameters(); |
cab30143 JQ |
1789 | } |
1790 | ||
f37afb5a | 1791 | if (local_err) { |
8c69ae9e | 1792 | if (!resume_requested) { |
b5eea99e LS |
1793 | yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
1794 | } | |
d59ce6f3 | 1795 | migrate_fd_error(s, local_err); |
f37afb5a | 1796 | error_propagate(errp, local_err); |
e1c37d0e | 1797 | return; |
1299c631 | 1798 | } |
cab30143 JQ |
1799 | } |
1800 | ||
6cdedb07 | 1801 | void qmp_migrate_cancel(Error **errp) |
cab30143 | 1802 | { |
458fecca | 1803 | migration_cancel(NULL); |
cab30143 JQ |
1804 | } |
1805 | ||
89cfc02c DDAG |
1806 | void qmp_migrate_continue(MigrationStatus state, Error **errp) |
1807 | { | |
1808 | MigrationState *s = migrate_get_current(); | |
1809 | if (s->state != state) { | |
1810 | error_setg(errp, "Migration not in expected state: %s", | |
1811 | MigrationStatus_str(s->state)); | |
1812 | return; | |
1813 | } | |
1814 | qemu_sem_post(&s->pause_sem); | |
1815 | } | |
1816 | ||
70b20477 DDAG |
1817 | /* migration thread support */ |
1818 | /* | |
1819 | * Something bad happened to the RP stream, mark an error | |
1820 | * The caller shall print or trace something to indicate why | |
1821 | */ | |
1822 | static void mark_source_rp_bad(MigrationState *s) | |
1823 | { | |
1824 | s->rp_state.error = true; | |
1825 | } | |
1826 | ||
5e79a4bf PX |
1827 | void migration_rp_wait(MigrationState *s) |
1828 | { | |
1829 | qemu_sem_wait(&s->rp_state.rp_sem); | |
1830 | } | |
1831 | ||
1832 | void migration_rp_kick(MigrationState *s) | |
1833 | { | |
1834 | qemu_sem_post(&s->rp_state.rp_sem); | |
1835 | } | |
1836 | ||
70b20477 DDAG |
1837 | static struct rp_cmd_args { |
1838 | ssize_t len; /* -1 = variable */ | |
1839 | const char *name; | |
1840 | } rp_cmd_args[] = { | |
1841 | [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, | |
1842 | [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, | |
1843 | [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, | |
1e2d90eb DDAG |
1844 | [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, |
1845 | [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, | |
a335debb | 1846 | [MIG_RP_MSG_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" }, |
13955b89 | 1847 | [MIG_RP_MSG_RESUME_ACK] = { .len = 4, .name = "RESUME_ACK" }, |
1b4adb10 | 1848 | [MIG_RP_MSG_SWITCHOVER_ACK] = { .len = 0, .name = "SWITCHOVER_ACK" }, |
70b20477 DDAG |
1849 | [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, |
1850 | }; | |
1851 | ||
1e2d90eb DDAG |
1852 | /* |
1853 | * Process a request for pages received on the return path, | |
1854 | * We're allowed to send more than requested (e.g. to round to our page size) | |
1855 | * and we don't need to send pages that have already been sent. | |
1856 | */ | |
1857 | static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, | |
1858 | ram_addr_t start, size_t len) | |
1859 | { | |
8e3b0cbb | 1860 | long our_host_ps = qemu_real_host_page_size(); |
6c595cde | 1861 | |
1e2d90eb | 1862 | trace_migrate_handle_rp_req_pages(rbname, start, len); |
6c595cde DDAG |
1863 | |
1864 | /* | |
1865 | * Since we currently insist on matching page sizes, just sanity check | |
1866 | * we're being asked for whole host pages. | |
1867 | */ | |
7648297d DH |
1868 | if (!QEMU_IS_ALIGNED(start, our_host_ps) || |
1869 | !QEMU_IS_ALIGNED(len, our_host_ps)) { | |
6c595cde DDAG |
1870 | error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT |
1871 | " len: %zd", __func__, start, len); | |
1872 | mark_source_rp_bad(ms); | |
1873 | return; | |
1874 | } | |
1875 | ||
96506894 | 1876 | if (ram_save_queue_pages(rbname, start, len)) { |
6c595cde DDAG |
1877 | mark_source_rp_bad(ms); |
1878 | } | |
1e2d90eb DDAG |
1879 | } |
1880 | ||
a335debb PX |
1881 | static int migrate_handle_rp_recv_bitmap(MigrationState *s, char *block_name) |
1882 | { | |
1883 | RAMBlock *block = qemu_ram_block_by_name(block_name); | |
1884 | ||
1885 | if (!block) { | |
1886 | error_report("%s: invalid block name '%s'", __func__, block_name); | |
1887 | return -EINVAL; | |
1888 | } | |
1889 | ||
1890 | /* Fetch the received bitmap and refresh the dirty bitmap */ | |
1891 | return ram_dirty_bitmap_reload(s, block); | |
1892 | } | |
1893 | ||
13955b89 PX |
1894 | static int migrate_handle_rp_resume_ack(MigrationState *s, uint32_t value) |
1895 | { | |
1896 | trace_source_return_path_thread_resume_ack(value); | |
1897 | ||
1898 | if (value != MIGRATION_RESUME_ACK_VALUE) { | |
1899 | error_report("%s: illegal resume_ack value %"PRIu32, | |
1900 | __func__, value); | |
1901 | return -1; | |
1902 | } | |
1903 | ||
1904 | /* Now both sides are active. */ | |
1905 | migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_RECOVER, | |
1906 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
1907 | ||
94190696 | 1908 | /* Notify send thread that time to continue send pages */ |
5e79a4bf | 1909 | migration_rp_kick(s); |
13955b89 PX |
1910 | |
1911 | return 0; | |
1912 | } | |
1913 | ||
93589827 PX |
1914 | /* |
1915 | * Release ms->rp_state.from_dst_file (and postcopy_qemufile_src if | |
1916 | * existed) in a safe way. | |
1917 | */ | |
1918 | static void migration_release_dst_files(MigrationState *ms) | |
43044ac0 PX |
1919 | { |
1920 | QEMUFile *file; | |
1921 | ||
1922 | WITH_QEMU_LOCK_GUARD(&ms->qemu_file_lock) { | |
1923 | /* | |
1924 | * Reset the from_dst_file pointer first before releasing it, as we | |
1925 | * can't block within lock section | |
1926 | */ | |
1927 | file = ms->rp_state.from_dst_file; | |
1928 | ms->rp_state.from_dst_file = NULL; | |
1929 | } | |
1930 | ||
93589827 PX |
1931 | /* |
1932 | * Do the same to postcopy fast path socket too if there is. No | |
1933 | * locking needed because this qemufile should only be managed by | |
1934 | * return path thread. | |
1935 | */ | |
1936 | if (ms->postcopy_qemufile_src) { | |
1937 | migration_ioc_unregister_yank_from_file(ms->postcopy_qemufile_src); | |
1938 | qemu_file_shutdown(ms->postcopy_qemufile_src); | |
1939 | qemu_fclose(ms->postcopy_qemufile_src); | |
1940 | ms->postcopy_qemufile_src = NULL; | |
1941 | } | |
1942 | ||
43044ac0 PX |
1943 | qemu_fclose(file); |
1944 | } | |
1945 | ||
70b20477 DDAG |
1946 | /* |
1947 | * Handles messages sent on the return path towards the source VM | |
1948 | * | |
1949 | */ | |
1950 | static void *source_return_path_thread(void *opaque) | |
1951 | { | |
1952 | MigrationState *ms = opaque; | |
1953 | QEMUFile *rp = ms->rp_state.from_dst_file; | |
1954 | uint16_t header_len, header_type; | |
568b01ca | 1955 | uint8_t buf[512]; |
70b20477 | 1956 | uint32_t tmp32, sibling_error; |
1e2d90eb DDAG |
1957 | ram_addr_t start = 0; /* =0 to silence warning */ |
1958 | size_t len = 0, expected_len; | |
70b20477 DDAG |
1959 | int res; |
1960 | ||
1961 | trace_source_return_path_thread_entry(); | |
74637e6f | 1962 | rcu_register_thread(); |
14b1742e | 1963 | |
70b20477 DDAG |
1964 | while (!ms->rp_state.error && !qemu_file_get_error(rp) && |
1965 | migration_is_setup_or_active(ms->state)) { | |
1966 | trace_source_return_path_thread_loop_top(); | |
1967 | header_type = qemu_get_be16(rp); | |
1968 | header_len = qemu_get_be16(rp); | |
1969 | ||
7a9ddfbf PX |
1970 | if (qemu_file_get_error(rp)) { |
1971 | mark_source_rp_bad(ms); | |
1972 | goto out; | |
1973 | } | |
1974 | ||
70b20477 DDAG |
1975 | if (header_type >= MIG_RP_MSG_MAX || |
1976 | header_type == MIG_RP_MSG_INVALID) { | |
1977 | error_report("RP: Received invalid message 0x%04x length 0x%04x", | |
ed8b2828 | 1978 | header_type, header_len); |
70b20477 DDAG |
1979 | mark_source_rp_bad(ms); |
1980 | goto out; | |
1981 | } | |
1982 | ||
1983 | if ((rp_cmd_args[header_type].len != -1 && | |
1984 | header_len != rp_cmd_args[header_type].len) || | |
568b01ca | 1985 | header_len > sizeof(buf)) { |
70b20477 | 1986 | error_report("RP: Received '%s' message (0x%04x) with" |
ed8b2828 MZ |
1987 | "incorrect length %d expecting %zu", |
1988 | rp_cmd_args[header_type].name, header_type, header_len, | |
1989 | (size_t)rp_cmd_args[header_type].len); | |
70b20477 DDAG |
1990 | mark_source_rp_bad(ms); |
1991 | goto out; | |
1992 | } | |
1993 | ||
1994 | /* We know we've got a valid header by this point */ | |
1995 | res = qemu_get_buffer(rp, buf, header_len); | |
1996 | if (res != header_len) { | |
1997 | error_report("RP: Failed reading data for message 0x%04x" | |
1998 | " read %d expected %d", | |
1999 | header_type, res, header_len); | |
2000 | mark_source_rp_bad(ms); | |
2001 | goto out; | |
2002 | } | |
2003 | ||
2004 | /* OK, we have the message and the data */ | |
2005 | switch (header_type) { | |
2006 | case MIG_RP_MSG_SHUT: | |
4d885131 | 2007 | sibling_error = ldl_be_p(buf); |
70b20477 DDAG |
2008 | trace_source_return_path_thread_shut(sibling_error); |
2009 | if (sibling_error) { | |
2010 | error_report("RP: Sibling indicated error %d", sibling_error); | |
2011 | mark_source_rp_bad(ms); | |
2012 | } | |
2013 | /* | |
2014 | * We'll let the main thread deal with closing the RP | |
2015 | * we could do a shutdown(2) on it, but we're the only user | |
2016 | * anyway, so there's nothing gained. | |
2017 | */ | |
2018 | goto out; | |
2019 | ||
2020 | case MIG_RP_MSG_PONG: | |
4d885131 | 2021 | tmp32 = ldl_be_p(buf); |
70b20477 | 2022 | trace_source_return_path_thread_pong(tmp32); |
b28fb582 | 2023 | qemu_sem_post(&ms->rp_state.rp_pong_acks); |
70b20477 DDAG |
2024 | break; |
2025 | ||
1e2d90eb | 2026 | case MIG_RP_MSG_REQ_PAGES: |
4d885131 PM |
2027 | start = ldq_be_p(buf); |
2028 | len = ldl_be_p(buf + 8); | |
1e2d90eb DDAG |
2029 | migrate_handle_rp_req_pages(ms, NULL, start, len); |
2030 | break; | |
2031 | ||
2032 | case MIG_RP_MSG_REQ_PAGES_ID: | |
2033 | expected_len = 12 + 1; /* header + termination */ | |
2034 | ||
2035 | if (header_len >= expected_len) { | |
4d885131 PM |
2036 | start = ldq_be_p(buf); |
2037 | len = ldl_be_p(buf + 8); | |
1e2d90eb DDAG |
2038 | /* Now we expect an idstr */ |
2039 | tmp32 = buf[12]; /* Length of the following idstr */ | |
2040 | buf[13 + tmp32] = '\0'; | |
2041 | expected_len += tmp32; | |
2042 | } | |
2043 | if (header_len != expected_len) { | |
2044 | error_report("RP: Req_Page_id with length %d expecting %zd", | |
ed8b2828 | 2045 | header_len, expected_len); |
1e2d90eb DDAG |
2046 | mark_source_rp_bad(ms); |
2047 | goto out; | |
2048 | } | |
2049 | migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); | |
2050 | break; | |
2051 | ||
a335debb PX |
2052 | case MIG_RP_MSG_RECV_BITMAP: |
2053 | if (header_len < 1) { | |
2054 | error_report("%s: missing block name", __func__); | |
2055 | mark_source_rp_bad(ms); | |
2056 | goto out; | |
2057 | } | |
2058 | /* Format: len (1B) + idstr (<255B). This ends the idstr. */ | |
2059 | buf[buf[0] + 1] = '\0'; | |
2060 | if (migrate_handle_rp_recv_bitmap(ms, (char *)(buf + 1))) { | |
2061 | mark_source_rp_bad(ms); | |
2062 | goto out; | |
2063 | } | |
2064 | break; | |
2065 | ||
13955b89 PX |
2066 | case MIG_RP_MSG_RESUME_ACK: |
2067 | tmp32 = ldl_be_p(buf); | |
2068 | if (migrate_handle_rp_resume_ack(ms, tmp32)) { | |
2069 | mark_source_rp_bad(ms); | |
2070 | goto out; | |
2071 | } | |
2072 | break; | |
2073 | ||
1b4adb10 AH |
2074 | case MIG_RP_MSG_SWITCHOVER_ACK: |
2075 | ms->switchover_acked = true; | |
2076 | trace_source_return_path_thread_switchover_acked(); | |
2077 | break; | |
2078 | ||
70b20477 DDAG |
2079 | default: |
2080 | break; | |
2081 | } | |
2082 | } | |
14b1742e PX |
2083 | |
2084 | out: | |
ef796ee9 | 2085 | if (qemu_file_get_error(rp)) { |
70b20477 DDAG |
2086 | trace_source_return_path_thread_bad_end(); |
2087 | mark_source_rp_bad(ms); | |
2088 | } | |
2089 | ||
2090 | trace_source_return_path_thread_end(); | |
74637e6f | 2091 | rcu_unregister_thread(); |
70b20477 DDAG |
2092 | return NULL; |
2093 | } | |
2094 | ||
ef796ee9 | 2095 | static int open_return_path_on_source(MigrationState *ms) |
70b20477 | 2096 | { |
89a02a9f | 2097 | ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); |
70b20477 DDAG |
2098 | if (!ms->rp_state.from_dst_file) { |
2099 | return -1; | |
2100 | } | |
2101 | ||
2102 | trace_open_return_path_on_source(); | |
d3e35b8f | 2103 | |
70b20477 DDAG |
2104 | qemu_thread_create(&ms->rp_state.rp_thread, "return path", |
2105 | source_return_path_thread, ms, QEMU_THREAD_JOINABLE); | |
53021ea1 | 2106 | ms->rp_state.rp_thread_created = true; |
70b20477 DDAG |
2107 | |
2108 | trace_open_return_path_on_source_continue(); | |
2109 | ||
2110 | return 0; | |
2111 | } | |
2112 | ||
d7f5a043 | 2113 | static int close_return_path_on_source(MigrationState *ms) |
70b20477 | 2114 | { |
d50f5dc0 FR |
2115 | int ret; |
2116 | ||
2117 | if (!ms->rp_state.rp_thread_created) { | |
2118 | return 0; | |
2119 | } | |
2120 | ||
2121 | trace_migration_return_path_end_before(); | |
2122 | ||
70b20477 | 2123 | /* |
639decf5 FR |
2124 | * If this is a normal exit then the destination will send a SHUT |
2125 | * and the rp_thread will exit, however if there's an error we | |
2126 | * need to cause it to exit. shutdown(2), if we have it, will | |
2127 | * cause it to unblock if it's stuck waiting for the destination. | |
70b20477 | 2128 | */ |
639decf5 FR |
2129 | WITH_QEMU_LOCK_GUARD(&ms->qemu_file_lock) { |
2130 | if (ms->to_dst_file && ms->rp_state.from_dst_file && | |
2131 | qemu_file_get_error(ms->to_dst_file)) { | |
2132 | qemu_file_shutdown(ms->rp_state.from_dst_file); | |
2133 | } | |
70b20477 | 2134 | } |
639decf5 | 2135 | |
70b20477 DDAG |
2136 | trace_await_return_path_close_on_source_joining(); |
2137 | qemu_thread_join(&ms->rp_state.rp_thread); | |
53021ea1 | 2138 | ms->rp_state.rp_thread_created = false; |
70b20477 | 2139 | trace_await_return_path_close_on_source_close(); |
d50f5dc0 FR |
2140 | |
2141 | ret = ms->rp_state.error; | |
ef796ee9 | 2142 | ms->rp_state.error = false; |
36e9aab3 FR |
2143 | |
2144 | migration_release_dst_files(ms); | |
2145 | ||
d50f5dc0 FR |
2146 | trace_migration_return_path_end_after(ret); |
2147 | return ret; | |
70b20477 DDAG |
2148 | } |
2149 | ||
5655aab0 PX |
2150 | static inline void |
2151 | migration_wait_main_channel(MigrationState *ms) | |
2152 | { | |
2153 | /* Wait until one PONG message received */ | |
2154 | qemu_sem_wait(&ms->rp_state.rp_pong_acks); | |
2155 | } | |
2156 | ||
1d34e4bf DDAG |
2157 | /* |
2158 | * Switch from normal iteration to postcopy | |
2159 | * Returns non-0 on error | |
2160 | */ | |
908927db | 2161 | static int postcopy_start(MigrationState *ms, Error **errp) |
1d34e4bf DDAG |
2162 | { |
2163 | int ret; | |
61b67d47 DB |
2164 | QIOChannelBuffer *bioc; |
2165 | QEMUFile *fb; | |
52033349 | 2166 | uint64_t bandwidth = migrate_max_postcopy_bandwidth(); |
ef8d6488 | 2167 | bool restart_block = false; |
0331c8ca | 2168 | int cur_state = MIGRATION_STATUS_ACTIVE; |
d0edb8a1 | 2169 | |
5655aab0 PX |
2170 | if (migrate_postcopy_preempt()) { |
2171 | migration_wait_main_channel(ms); | |
2172 | if (postcopy_preempt_establish_channel(ms)) { | |
2173 | migrate_set_state(&ms->state, ms->state, MIGRATION_STATUS_FAILED); | |
2174 | return -1; | |
2175 | } | |
d0edb8a1 PX |
2176 | } |
2177 | ||
0331c8ca DDAG |
2178 | if (!migrate_pause_before_switchover()) { |
2179 | migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, | |
2180 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
2181 | } | |
1d34e4bf DDAG |
2182 | |
2183 | trace_postcopy_start(); | |
2184 | qemu_mutex_lock_iothread(); | |
2185 | trace_postcopy_start_set_run(); | |
2186 | ||
e22ffad0 | 2187 | migration_downtime_start(ms); |
62f5da7d | 2188 | |
fb064112 | 2189 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); |
1d34e4bf | 2190 | global_state_store(); |
93bdf888 | 2191 | ret = migration_stop_vm(RUN_STATE_FINISH_MIGRATE); |
76b1c7fe KW |
2192 | if (ret < 0) { |
2193 | goto fail; | |
2194 | } | |
1d34e4bf | 2195 | |
0331c8ca DDAG |
2196 | ret = migration_maybe_pause(ms, &cur_state, |
2197 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
2198 | if (ret < 0) { | |
2199 | goto fail; | |
2200 | } | |
2201 | ||
76b1c7fe | 2202 | ret = bdrv_inactivate_all(); |
1d34e4bf DDAG |
2203 | if (ret < 0) { |
2204 | goto fail; | |
2205 | } | |
ef8d6488 | 2206 | restart_block = true; |
1d34e4bf | 2207 | |
1c0d249d DDAG |
2208 | /* |
2209 | * Cause any non-postcopiable, but iterative devices to | |
2210 | * send out their final data. | |
2211 | */ | |
a1fbe750 | 2212 | qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false); |
1c0d249d | 2213 | |
1d34e4bf DDAG |
2214 | /* |
2215 | * in Finish migrate and with the io-lock held everything should | |
2216 | * be quiet, but we've potentially still got dirty pages and we | |
2217 | * need to tell the destination to throw any pages it's already received | |
2218 | * that are dirty | |
2219 | */ | |
58110f0a | 2220 | if (migrate_postcopy_ram()) { |
739fcc1b | 2221 | ram_postcopy_send_discard_bitmap(ms); |
1d34e4bf DDAG |
2222 | } |
2223 | ||
2224 | /* | |
2225 | * send rest of state - note things that are doing postcopy | |
2226 | * will notice we're in POSTCOPY_ACTIVE and not actually | |
2227 | * wrap their state up here | |
2228 | */ | |
e1fde0e0 | 2229 | migration_rate_set(bandwidth); |
58110f0a VSO |
2230 | if (migrate_postcopy_ram()) { |
2231 | /* Ping just for debugging, helps line traces up */ | |
2232 | qemu_savevm_send_ping(ms->to_dst_file, 2); | |
2233 | } | |
1d34e4bf DDAG |
2234 | |
2235 | /* | |
2236 | * While loading the device state we may trigger page transfer | |
2237 | * requests and the fd must be free to process those, and thus | |
2238 | * the destination must read the whole device state off the fd before | |
2239 | * it starts processing it. Unfortunately the ad-hoc migration format | |
2240 | * doesn't allow the destination to know the size to read without fully | |
2241 | * parsing it through each devices load-state code (especially the open | |
2242 | * coded devices that use get/put). | |
2243 | * So we wrap the device state up in a package with a length at the start; | |
2244 | * to do this we use a qemu_buf to hold the whole of the device state. | |
2245 | */ | |
61b67d47 | 2246 | bioc = qio_channel_buffer_new(4096); |
6f01f136 | 2247 | qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer"); |
77ef2dc1 | 2248 | fb = qemu_file_new_output(QIO_CHANNEL(bioc)); |
61b67d47 | 2249 | object_unref(OBJECT(bioc)); |
1d34e4bf | 2250 | |
c76201ab DDAG |
2251 | /* |
2252 | * Make sure the receiver can get incoming pages before we send the rest | |
2253 | * of the state | |
2254 | */ | |
2255 | qemu_savevm_send_postcopy_listen(fb); | |
2256 | ||
a1fbe750 | 2257 | qemu_savevm_state_complete_precopy(fb, false, false); |
58110f0a VSO |
2258 | if (migrate_postcopy_ram()) { |
2259 | qemu_savevm_send_ping(fb, 3); | |
2260 | } | |
1d34e4bf DDAG |
2261 | |
2262 | qemu_savevm_send_postcopy_run(fb); | |
2263 | ||
2264 | /* <><> end of stuff going into the package */ | |
1d34e4bf | 2265 | |
ef8d6488 DDAG |
2266 | /* Last point of recovery; as soon as we send the package the destination |
2267 | * can open devices and potentially start running. | |
2268 | * Lets just check again we've not got any errors. | |
2269 | */ | |
2270 | ret = qemu_file_get_error(ms->to_dst_file); | |
2271 | if (ret) { | |
908927db | 2272 | error_setg(errp, "postcopy_start: Migration stream errored (pre package)"); |
ef8d6488 DDAG |
2273 | goto fail_closefb; |
2274 | } | |
2275 | ||
2276 | restart_block = false; | |
2277 | ||
1d34e4bf | 2278 | /* Now send that blob */ |
61b67d47 | 2279 | if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) { |
1d34e4bf DDAG |
2280 | goto fail_closefb; |
2281 | } | |
2282 | qemu_fclose(fb); | |
b82fc321 DDAG |
2283 | |
2284 | /* Send a notify to give a chance for anything that needs to happen | |
2285 | * at the transition to postcopy and after the device state; in particular | |
2286 | * spice needs to trigger a transition now | |
2287 | */ | |
2288 | ms->postcopy_after_devices = true; | |
d9cda213 | 2289 | migration_call_notifiers(ms); |
b82fc321 | 2290 | |
e22ffad0 | 2291 | migration_downtime_end(ms); |
1d34e4bf DDAG |
2292 | |
2293 | qemu_mutex_unlock_iothread(); | |
2294 | ||
58110f0a VSO |
2295 | if (migrate_postcopy_ram()) { |
2296 | /* | |
2297 | * Although this ping is just for debug, it could potentially be | |
2298 | * used for getting a better measurement of downtime at the source. | |
2299 | */ | |
2300 | qemu_savevm_send_ping(ms->to_dst_file, 4); | |
2301 | } | |
1d34e4bf | 2302 | |
ced1c616 PB |
2303 | if (migrate_release_ram()) { |
2304 | ram_postcopy_migrated_memory_release(ms); | |
2305 | } | |
2306 | ||
89a02a9f | 2307 | ret = qemu_file_get_error(ms->to_dst_file); |
1d34e4bf | 2308 | if (ret) { |
908927db | 2309 | error_setg(errp, "postcopy_start: Migration stream errored"); |
48781e5b | 2310 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1d34e4bf DDAG |
2311 | MIGRATION_STATUS_FAILED); |
2312 | } | |
2313 | ||
c01b16ed PX |
2314 | trace_postcopy_preempt_enabled(migrate_postcopy_preempt()); |
2315 | ||
1d34e4bf DDAG |
2316 | return ret; |
2317 | ||
2318 | fail_closefb: | |
2319 | qemu_fclose(fb); | |
2320 | fail: | |
48781e5b | 2321 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1d34e4bf | 2322 | MIGRATION_STATUS_FAILED); |
ef8d6488 DDAG |
2323 | if (restart_block) { |
2324 | /* A failure happened early enough that we know the destination hasn't | |
2325 | * accessed block devices, so we're safe to recover. | |
2326 | */ | |
2327 | Error *local_err = NULL; | |
2328 | ||
3b717194 | 2329 | bdrv_activate_all(&local_err); |
ef8d6488 DDAG |
2330 | if (local_err) { |
2331 | error_report_err(local_err); | |
2332 | } | |
2333 | } | |
1d34e4bf DDAG |
2334 | qemu_mutex_unlock_iothread(); |
2335 | return -1; | |
2336 | } | |
2337 | ||
e91d8951 DDAG |
2338 | /** |
2339 | * migration_maybe_pause: Pause if required to by | |
2340 | * migrate_pause_before_switchover called with the iothread locked | |
2341 | * Returns: 0 on success | |
2342 | */ | |
0331c8ca DDAG |
2343 | static int migration_maybe_pause(MigrationState *s, |
2344 | int *current_active_state, | |
2345 | int new_state) | |
e91d8951 DDAG |
2346 | { |
2347 | if (!migrate_pause_before_switchover()) { | |
2348 | return 0; | |
2349 | } | |
2350 | ||
2351 | /* Since leaving this state is not atomic with posting the semaphore | |
2352 | * it's possible that someone could have issued multiple migrate_continue | |
2353 | * and the semaphore is incorrectly positive at this point; | |
2354 | * the docs say it's undefined to reinit a semaphore that's already | |
2355 | * init'd, so use timedwait to eat up any existing posts. | |
2356 | */ | |
2357 | while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) { | |
2358 | /* This block intentionally left blank */ | |
2359 | } | |
2360 | ||
8958338b ZF |
2361 | /* |
2362 | * If the migration is cancelled when it is in the completion phase, | |
2363 | * the migration state is set to MIGRATION_STATUS_CANCELLING. | |
2364 | * So we don't need to wait a semaphore, otherwise we would always | |
2365 | * wait for the 'pause_sem' semaphore. | |
2366 | */ | |
2367 | if (s->state != MIGRATION_STATUS_CANCELLING) { | |
2368 | qemu_mutex_unlock_iothread(); | |
2369 | migrate_set_state(&s->state, *current_active_state, | |
2370 | MIGRATION_STATUS_PRE_SWITCHOVER); | |
2371 | qemu_sem_wait(&s->pause_sem); | |
2372 | migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER, | |
2373 | new_state); | |
2374 | *current_active_state = new_state; | |
2375 | qemu_mutex_lock_iothread(); | |
2376 | } | |
e91d8951 | 2377 | |
0331c8ca | 2378 | return s->state == new_state ? 0 : -EINVAL; |
e91d8951 DDAG |
2379 | } |
2380 | ||
d7f5a043 WW |
2381 | static int migration_completion_precopy(MigrationState *s, |
2382 | int *current_active_state) | |
09f6c85e DDAG |
2383 | { |
2384 | int ret; | |
2385 | ||
d7f5a043 | 2386 | qemu_mutex_lock_iothread(); |
e22ffad0 | 2387 | migration_downtime_start(s); |
d7f5a043 | 2388 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); |
f4584076 | 2389 | |
d7f5a043 WW |
2390 | s->vm_old_state = runstate_get(); |
2391 | global_state_store(); | |
c33f1829 | 2392 | |
93bdf888 | 2393 | ret = migration_stop_vm(RUN_STATE_FINISH_MIGRATE); |
d7f5a043 WW |
2394 | trace_migration_completion_vm_stop(ret); |
2395 | if (ret < 0) { | |
2396 | goto out_unlock; | |
2397 | } | |
c33f1829 | 2398 | |
d7f5a043 WW |
2399 | ret = migration_maybe_pause(s, current_active_state, |
2400 | MIGRATION_STATUS_DEVICE); | |
2401 | if (ret < 0) { | |
2402 | goto out_unlock; | |
2403 | } | |
09f6c85e | 2404 | |
d7f5a043 WW |
2405 | /* |
2406 | * Inactivate disks except in COLO, and track that we have done so in order | |
2407 | * to remember to reactivate them if migration fails or is cancelled. | |
2408 | */ | |
2409 | s->block_inactive = !migrate_colo(); | |
2410 | migration_rate_set(RATE_LIMIT_DISABLED); | |
2411 | ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false, | |
2412 | s->block_inactive); | |
2413 | out_unlock: | |
2414 | qemu_mutex_unlock_iothread(); | |
2415 | return ret; | |
2416 | } | |
b10ac0c4 | 2417 | |
d7f5a043 WW |
2418 | static void migration_completion_postcopy(MigrationState *s) |
2419 | { | |
2420 | trace_migration_completion_postcopy_end(); | |
2421 | ||
2422 | qemu_mutex_lock_iothread(); | |
2423 | qemu_savevm_state_complete_postcopy(s->to_dst_file); | |
2424 | qemu_mutex_unlock_iothread(); | |
2425 | ||
2426 | /* | |
2427 | * Shutdown the postcopy fast path thread. This is only needed when dest | |
2428 | * QEMU binary is old (7.1/7.2). QEMU 8.0+ doesn't need this. | |
2429 | */ | |
2430 | if (migrate_postcopy_preempt() && s->preempt_pre_7_2) { | |
2431 | postcopy_preempt_shutdown_file(s); | |
2432 | } | |
68b88468 | 2433 | |
d7f5a043 WW |
2434 | trace_migration_completion_postcopy_end_after_complete(); |
2435 | } | |
2436 | ||
2437 | static void migration_completion_failed(MigrationState *s, | |
2438 | int current_active_state) | |
2439 | { | |
2440 | if (s->block_inactive && (s->state == MIGRATION_STATUS_ACTIVE || | |
2441 | s->state == MIGRATION_STATUS_DEVICE)) { | |
6621883f | 2442 | /* |
d7f5a043 WW |
2443 | * If not doing postcopy, vm_start() will be called: let's |
2444 | * regain control on images. | |
6621883f | 2445 | */ |
d7f5a043 WW |
2446 | Error *local_err = NULL; |
2447 | ||
2448 | qemu_mutex_lock_iothread(); | |
2449 | bdrv_activate_all(&local_err); | |
2450 | if (local_err) { | |
2451 | error_report_err(local_err); | |
2452 | } else { | |
2453 | s->block_inactive = false; | |
36f62f11 | 2454 | } |
d7f5a043 WW |
2455 | qemu_mutex_unlock_iothread(); |
2456 | } | |
2457 | ||
2458 | migrate_set_state(&s->state, current_active_state, | |
2459 | MIGRATION_STATUS_FAILED); | |
2460 | } | |
36f62f11 | 2461 | |
d7f5a043 WW |
2462 | /** |
2463 | * migration_completion: Used by migration_thread when there's not much left. | |
2464 | * The caller 'breaks' the loop when this returns. | |
2465 | * | |
2466 | * @s: Current migration state | |
2467 | */ | |
2468 | static void migration_completion(MigrationState *s) | |
2469 | { | |
2470 | int ret = 0; | |
2471 | int current_active_state = s->state; | |
2472 | ||
2473 | if (s->state == MIGRATION_STATUS_ACTIVE) { | |
2474 | ret = migration_completion_precopy(s, ¤t_active_state); | |
2475 | } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
2476 | migration_completion_postcopy(s); | |
444252b9 | 2477 | } else { |
d7f5a043 WW |
2478 | ret = -1; |
2479 | } | |
2480 | ||
2481 | if (ret < 0) { | |
6ba11211 | 2482 | goto fail; |
09f6c85e | 2483 | } |
09f6c85e | 2484 | |
d7f5a043 | 2485 | if (close_return_path_on_source(s)) { |
d50f5dc0 | 2486 | goto fail; |
09f6c85e DDAG |
2487 | } |
2488 | ||
89a02a9f | 2489 | if (qemu_file_get_error(s->to_dst_file)) { |
09f6c85e | 2490 | trace_migration_completion_file_err(); |
6dab4c93 | 2491 | goto fail; |
09f6c85e DDAG |
2492 | } |
2493 | ||
5e804644 | 2494 | if (migrate_colo() && s->state == MIGRATION_STATUS_ACTIVE) { |
eeeb48ee ZC |
2495 | /* COLO does not support postcopy */ |
2496 | migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE, | |
2497 | MIGRATION_STATUS_COLO); | |
2498 | } else { | |
0b827d5e HZ |
2499 | migrate_set_state(&s->state, current_active_state, |
2500 | MIGRATION_STATUS_COMPLETED); | |
2501 | } | |
2502 | ||
09f6c85e DDAG |
2503 | return; |
2504 | ||
6dab4c93 | 2505 | fail: |
d7f5a043 | 2506 | migration_completion_failed(s, current_active_state); |
09f6c85e DDAG |
2507 | } |
2508 | ||
8518278a AG |
2509 | /** |
2510 | * bg_migration_completion: Used by bg_migration_thread when after all the | |
2511 | * RAM has been saved. The caller 'breaks' the loop when this returns. | |
2512 | * | |
2513 | * @s: Current migration state | |
2514 | */ | |
2515 | static void bg_migration_completion(MigrationState *s) | |
2516 | { | |
2517 | int current_active_state = s->state; | |
2518 | ||
8518278a AG |
2519 | if (s->state == MIGRATION_STATUS_ACTIVE) { |
2520 | /* | |
2521 | * By this moment we have RAM content saved into the migration stream. | |
2522 | * The next step is to flush the non-RAM content (device state) | |
2523 | * right after the ram content. The device state has been stored into | |
2524 | * the temporary buffer before RAM saving started. | |
2525 | */ | |
2526 | qemu_put_buffer(s->to_dst_file, s->bioc->data, s->bioc->usage); | |
2527 | qemu_fflush(s->to_dst_file); | |
2528 | } else if (s->state == MIGRATION_STATUS_CANCELLING) { | |
2529 | goto fail; | |
2530 | } | |
2531 | ||
2532 | if (qemu_file_get_error(s->to_dst_file)) { | |
2533 | trace_migration_completion_file_err(); | |
2534 | goto fail; | |
2535 | } | |
2536 | ||
2537 | migrate_set_state(&s->state, current_active_state, | |
2538 | MIGRATION_STATUS_COMPLETED); | |
2539 | return; | |
2540 | ||
2541 | fail: | |
2542 | migrate_set_state(&s->state, current_active_state, | |
2543 | MIGRATION_STATUS_FAILED); | |
2544 | } | |
2545 | ||
b23c2ade PX |
2546 | typedef enum MigThrError { |
2547 | /* No error detected */ | |
2548 | MIG_THR_ERR_NONE = 0, | |
2549 | /* Detected error, but resumed successfully */ | |
2550 | MIG_THR_ERR_RECOVERED = 1, | |
2551 | /* Detected fatal error, need to exit */ | |
2552 | MIG_THR_ERR_FATAL = 2, | |
2553 | } MigThrError; | |
2554 | ||
94190696 PX |
2555 | static int postcopy_resume_handshake(MigrationState *s) |
2556 | { | |
2557 | qemu_savevm_send_postcopy_resume(s->to_dst_file); | |
2558 | ||
2559 | while (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
5e79a4bf | 2560 | migration_rp_wait(s); |
94190696 PX |
2561 | } |
2562 | ||
2563 | if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
2564 | return 0; | |
2565 | } | |
2566 | ||
2567 | return -1; | |
2568 | } | |
2569 | ||
135b87b4 PX |
2570 | /* Return zero if success, or <0 for error */ |
2571 | static int postcopy_do_resume(MigrationState *s) | |
2572 | { | |
d1b8eadb PX |
2573 | int ret; |
2574 | ||
2575 | /* | |
2576 | * Call all the resume_prepare() hooks, so that modules can be | |
2577 | * ready for the migration resume. | |
2578 | */ | |
2579 | ret = qemu_savevm_state_resume_prepare(s); | |
2580 | if (ret) { | |
2581 | error_report("%s: resume_prepare() failure detected: %d", | |
2582 | __func__, ret); | |
2583 | return ret; | |
2584 | } | |
2585 | ||
5655aab0 PX |
2586 | /* |
2587 | * If preempt is enabled, re-establish the preempt channel. Note that | |
2588 | * we do it after resume prepare to make sure the main channel will be | |
2589 | * created before the preempt channel. E.g. with weak network, the | |
2590 | * dest QEMU may get messed up with the preempt and main channels on | |
2591 | * the order of connection setup. This guarantees the correct order. | |
2592 | */ | |
2593 | ret = postcopy_preempt_establish_channel(s); | |
2594 | if (ret) { | |
2595 | error_report("%s: postcopy_preempt_establish_channel(): %d", | |
2596 | __func__, ret); | |
2597 | return ret; | |
2598 | } | |
2599 | ||
d1b8eadb | 2600 | /* |
94190696 PX |
2601 | * Last handshake with destination on the resume (destination will |
2602 | * switch to postcopy-active afterwards) | |
d1b8eadb | 2603 | */ |
94190696 PX |
2604 | ret = postcopy_resume_handshake(s); |
2605 | if (ret) { | |
2606 | error_report("%s: handshake failed: %d", __func__, ret); | |
2607 | return ret; | |
2608 | } | |
d1b8eadb | 2609 | |
135b87b4 PX |
2610 | return 0; |
2611 | } | |
2612 | ||
b23c2ade PX |
2613 | /* |
2614 | * We don't return until we are in a safe state to continue current | |
2615 | * postcopy migration. Returns MIG_THR_ERR_RECOVERED if recovered, or | |
2616 | * MIG_THR_ERR_FATAL if unrecovery failure happened. | |
2617 | */ | |
2618 | static MigThrError postcopy_pause(MigrationState *s) | |
2619 | { | |
2620 | assert(s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
b23c2ade | 2621 | |
135b87b4 | 2622 | while (true) { |
62df066f PX |
2623 | QEMUFile *file; |
2624 | ||
39675fff PX |
2625 | /* |
2626 | * Current channel is possibly broken. Release it. Note that this is | |
2627 | * guaranteed even without lock because to_dst_file should only be | |
2628 | * modified by the migration thread. That also guarantees that the | |
2629 | * unregister of yank is safe too without the lock. It should be safe | |
2630 | * even to be within the qemu_file_lock, but we didn't do that to avoid | |
2631 | * taking more mutex (yank_lock) within qemu_file_lock. TL;DR: we make | |
2632 | * the qemu_file_lock critical section as small as possible. | |
2633 | */ | |
135b87b4 | 2634 | assert(s->to_dst_file); |
39675fff | 2635 | migration_ioc_unregister_yank_from_file(s->to_dst_file); |
62df066f PX |
2636 | qemu_mutex_lock(&s->qemu_file_lock); |
2637 | file = s->to_dst_file; | |
135b87b4 | 2638 | s->to_dst_file = NULL; |
62df066f PX |
2639 | qemu_mutex_unlock(&s->qemu_file_lock); |
2640 | ||
2641 | qemu_file_shutdown(file); | |
2642 | qemu_fclose(file); | |
b23c2ade | 2643 | |
ef796ee9 FR |
2644 | /* |
2645 | * We're already pausing, so ignore any errors on the return | |
2646 | * path and just wait for the thread to finish. It will be | |
2647 | * re-created when we resume. | |
2648 | */ | |
d7f5a043 | 2649 | close_return_path_on_source(s); |
ef796ee9 | 2650 | |
d246ea50 PX |
2651 | migrate_set_state(&s->state, s->state, |
2652 | MIGRATION_STATUS_POSTCOPY_PAUSED); | |
2653 | ||
135b87b4 PX |
2654 | error_report("Detected IO failure for postcopy. " |
2655 | "Migration paused."); | |
b23c2ade | 2656 | |
135b87b4 PX |
2657 | /* |
2658 | * We wait until things fixed up. Then someone will setup the | |
2659 | * status back for us. | |
2660 | */ | |
2661 | while (s->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
2662 | qemu_sem_wait(&s->postcopy_pause_sem); | |
2663 | } | |
2664 | ||
2665 | if (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
2666 | /* Woken up by a recover procedure. Give it a shot */ | |
b23c2ade | 2667 | |
135b87b4 PX |
2668 | /* Do the resume logic */ |
2669 | if (postcopy_do_resume(s) == 0) { | |
2670 | /* Let's continue! */ | |
2671 | trace_postcopy_pause_continued(); | |
2672 | return MIG_THR_ERR_RECOVERED; | |
2673 | } else { | |
2674 | /* | |
2675 | * Something wrong happened during the recovery, let's | |
2676 | * pause again. Pause is always better than throwing | |
2677 | * data away. | |
2678 | */ | |
2679 | continue; | |
2680 | } | |
2681 | } else { | |
2682 | /* This is not right... Time to quit. */ | |
2683 | return MIG_THR_ERR_FATAL; | |
2684 | } | |
2685 | } | |
b23c2ade PX |
2686 | } |
2687 | ||
2688 | static MigThrError migration_detect_error(MigrationState *s) | |
2689 | { | |
2690 | int ret; | |
c3c5eae6 | 2691 | int state = s->state; |
3d661c8a | 2692 | Error *local_error = NULL; |
c3c5eae6 DDAG |
2693 | |
2694 | if (state == MIGRATION_STATUS_CANCELLING || | |
2695 | state == MIGRATION_STATUS_CANCELLED) { | |
2696 | /* End the migration, but don't set the state to failed */ | |
2697 | return MIG_THR_ERR_FATAL; | |
2698 | } | |
b23c2ade | 2699 | |
60bb3c58 PX |
2700 | /* |
2701 | * Try to detect any file errors. Note that postcopy_qemufile_src will | |
2702 | * be NULL when postcopy preempt is not enabled. | |
2703 | */ | |
2704 | ret = qemu_file_get_error_obj_any(s->to_dst_file, | |
2705 | s->postcopy_qemufile_src, | |
2706 | &local_error); | |
b23c2ade PX |
2707 | if (!ret) { |
2708 | /* Everything is fine */ | |
3d661c8a | 2709 | assert(!local_error); |
b23c2ade PX |
2710 | return MIG_THR_ERR_NONE; |
2711 | } | |
2712 | ||
3d661c8a YK |
2713 | if (local_error) { |
2714 | migrate_set_error(s, local_error); | |
2715 | error_free(local_error); | |
2716 | } | |
2717 | ||
d5c8f2af | 2718 | if (state == MIGRATION_STATUS_POSTCOPY_ACTIVE && ret) { |
b23c2ade PX |
2719 | /* |
2720 | * For postcopy, we allow the network to be down for a | |
2721 | * while. After that, it can be continued by a | |
2722 | * recovery phase. | |
2723 | */ | |
2724 | return postcopy_pause(s); | |
2725 | } else { | |
2726 | /* | |
2727 | * For precopy (or postcopy with error outside IO), we fail | |
2728 | * with no time. | |
2729 | */ | |
c3c5eae6 | 2730 | migrate_set_state(&s->state, state, MIGRATION_STATUS_FAILED); |
b23c2ade PX |
2731 | trace_migration_thread_file_err(); |
2732 | ||
2733 | /* Time to stop the migration, now. */ | |
2734 | return MIG_THR_ERR_FATAL; | |
2735 | } | |
2736 | } | |
2737 | ||
cf011f08 PX |
2738 | static void migration_calculate_complete(MigrationState *s) |
2739 | { | |
f57e5a6c | 2740 | uint64_t bytes = migration_transferred_bytes(); |
cf011f08 | 2741 | int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
6cde6fbe | 2742 | int64_t transfer_time; |
cf011f08 | 2743 | |
e22ffad0 | 2744 | migration_downtime_end(s); |
cf011f08 | 2745 | s->total_time = end_time - s->start_time; |
6cde6fbe JQ |
2746 | transfer_time = s->total_time - s->setup_time; |
2747 | if (transfer_time) { | |
2748 | s->mbps = ((double) bytes * 8.0) / transfer_time / 1000; | |
cf011f08 PX |
2749 | } |
2750 | } | |
2751 | ||
87f3bd87 IR |
2752 | static void update_iteration_initial_status(MigrationState *s) |
2753 | { | |
2754 | /* | |
2755 | * Update these three fields at the same time to avoid mismatch info lead | |
2756 | * wrong speed calculation. | |
2757 | */ | |
2758 | s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
f57e5a6c | 2759 | s->iteration_initial_bytes = migration_transferred_bytes(); |
87f3bd87 IR |
2760 | s->iteration_initial_pages = ram_get_total_transferred_pages(); |
2761 | } | |
2762 | ||
b15df1ae PX |
2763 | static void migration_update_counters(MigrationState *s, |
2764 | int64_t current_time) | |
2765 | { | |
aecbfe9c | 2766 | uint64_t transferred, transferred_pages, time_spent; |
0c8f0efd | 2767 | uint64_t current_bytes; /* bytes transferred since the beginning */ |
8b239597 PX |
2768 | uint64_t switchover_bw; |
2769 | /* Expected bandwidth when switching over to destination QEMU */ | |
2770 | double expected_bw_per_ms; | |
b15df1ae PX |
2771 | double bandwidth; |
2772 | ||
2773 | if (current_time < s->iteration_start_time + BUFFER_DELAY) { | |
2774 | return; | |
2775 | } | |
2776 | ||
8b239597 | 2777 | switchover_bw = migrate_avail_switchover_bandwidth(); |
f57e5a6c | 2778 | current_bytes = migration_transferred_bytes(); |
0c8f0efd | 2779 | transferred = current_bytes - s->iteration_initial_bytes; |
b15df1ae PX |
2780 | time_spent = current_time - s->iteration_start_time; |
2781 | bandwidth = (double)transferred / time_spent; | |
8b239597 PX |
2782 | |
2783 | if (switchover_bw) { | |
2784 | /* | |
2785 | * If the user specified a switchover bandwidth, let's trust the | |
2786 | * user so that can be more accurate than what we estimated. | |
2787 | */ | |
2788 | expected_bw_per_ms = switchover_bw / 1000; | |
2789 | } else { | |
2790 | /* If the user doesn't specify bandwidth, we use the estimated */ | |
2791 | expected_bw_per_ms = bandwidth; | |
2792 | } | |
2793 | ||
2794 | s->threshold_size = expected_bw_per_ms * migrate_downtime_limit(); | |
b15df1ae PX |
2795 | |
2796 | s->mbps = (((double) transferred * 8.0) / | |
2797 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; | |
2798 | ||
aecbfe9c XG |
2799 | transferred_pages = ram_get_total_transferred_pages() - |
2800 | s->iteration_initial_pages; | |
2801 | s->pages_per_second = (double) transferred_pages / | |
2802 | (((double) time_spent / 1000.0)); | |
2803 | ||
b15df1ae PX |
2804 | /* |
2805 | * if we haven't sent anything, we don't want to | |
2806 | * recalculate. 10000 is a small enough number for our purposes | |
2807 | */ | |
aff3f660 | 2808 | if (stat64_get(&mig_stats.dirty_pages_rate) && |
72f8e587 | 2809 | transferred > 10000) { |
73208a33 | 2810 | s->expected_downtime = |
8b239597 | 2811 | stat64_get(&mig_stats.dirty_bytes_last_sync) / expected_bw_per_ms; |
b15df1ae PX |
2812 | } |
2813 | ||
0743f41f | 2814 | migration_rate_reset(); |
b15df1ae | 2815 | |
87f3bd87 | 2816 | update_iteration_initial_status(s); |
b15df1ae PX |
2817 | |
2818 | trace_migrate_transferred(transferred, time_spent, | |
8b239597 PX |
2819 | /* Both in unit bytes/ms */ |
2820 | bandwidth, switchover_bw / 1000, | |
2821 | s->threshold_size); | |
b15df1ae PX |
2822 | } |
2823 | ||
1b4adb10 AH |
2824 | static bool migration_can_switchover(MigrationState *s) |
2825 | { | |
2826 | if (!migrate_switchover_ack()) { | |
2827 | return true; | |
2828 | } | |
2829 | ||
2830 | /* No reason to wait for switchover ACK if VM is stopped */ | |
2831 | if (!runstate_is_running()) { | |
2832 | return true; | |
2833 | } | |
2834 | ||
2835 | return s->switchover_acked; | |
2836 | } | |
2837 | ||
2ad87305 PX |
2838 | /* Migration thread iteration status */ |
2839 | typedef enum { | |
2840 | MIG_ITERATE_RESUME, /* Resume current iteration */ | |
2841 | MIG_ITERATE_SKIP, /* Skip current iteration */ | |
2842 | MIG_ITERATE_BREAK, /* Break the loop */ | |
2843 | } MigIterateState; | |
2844 | ||
2845 | /* | |
2846 | * Return true if continue to the next iteration directly, false | |
2847 | * otherwise. | |
2848 | */ | |
2849 | static MigIterateState migration_iteration_run(MigrationState *s) | |
2850 | { | |
24beea4e | 2851 | uint64_t must_precopy, can_postcopy; |
908927db | 2852 | Error *local_err = NULL; |
2ad87305 | 2853 | bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE; |
1b4adb10 | 2854 | bool can_switchover = migration_can_switchover(s); |
2ad87305 | 2855 | |
24beea4e JQ |
2856 | qemu_savevm_state_pending_estimate(&must_precopy, &can_postcopy); |
2857 | uint64_t pending_size = must_precopy + can_postcopy; | |
2ad87305 | 2858 | |
24beea4e | 2859 | trace_migrate_pending_estimate(pending_size, must_precopy, can_postcopy); |
c8df4a7a | 2860 | |
24beea4e JQ |
2861 | if (must_precopy <= s->threshold_size) { |
2862 | qemu_savevm_state_pending_exact(&must_precopy, &can_postcopy); | |
2863 | pending_size = must_precopy + can_postcopy; | |
2864 | trace_migrate_pending_exact(pending_size, must_precopy, can_postcopy); | |
c8df4a7a | 2865 | } |
2ad87305 | 2866 | |
1b4adb10 | 2867 | if ((!pending_size || pending_size < s->threshold_size) && can_switchover) { |
2ad87305 PX |
2868 | trace_migration_thread_low_pending(pending_size); |
2869 | migration_completion(s); | |
2870 | return MIG_ITERATE_BREAK; | |
2871 | } | |
2872 | ||
d9df9292 | 2873 | /* Still a significant amount to transfer */ |
1b4adb10 | 2874 | if (!in_postcopy && must_precopy <= s->threshold_size && can_switchover && |
d9df9292 | 2875 | qatomic_read(&s->start_postcopy)) { |
908927db TG |
2876 | if (postcopy_start(s, &local_err)) { |
2877 | migrate_set_error(s, local_err); | |
2878 | error_report_err(local_err); | |
d9df9292 JQ |
2879 | } |
2880 | return MIG_ITERATE_SKIP; | |
2881 | } | |
2882 | ||
2883 | /* Just another iteration step */ | |
2884 | qemu_savevm_state_iterate(s->to_dst_file, in_postcopy); | |
2ad87305 PX |
2885 | return MIG_ITERATE_RESUME; |
2886 | } | |
2887 | ||
199aa6d4 PX |
2888 | static void migration_iteration_finish(MigrationState *s) |
2889 | { | |
2890 | /* If we enabled cpu throttling for auto-converge, turn it off. */ | |
2891 | cpu_throttle_stop(); | |
2892 | ||
2893 | qemu_mutex_lock_iothread(); | |
2894 | switch (s->state) { | |
2895 | case MIGRATION_STATUS_COMPLETED: | |
2896 | migration_calculate_complete(s); | |
2897 | runstate_set(RUN_STATE_POSTMIGRATE); | |
2898 | break; | |
751fe4c6 | 2899 | case MIGRATION_STATUS_COLO: |
d70178a8 | 2900 | assert(migrate_colo()); |
199aa6d4 | 2901 | migrate_start_colo_process(s); |
f4584076 | 2902 | s->vm_old_state = RUN_STATE_RUNNING; |
199aa6d4 PX |
2903 | /* Fallthrough */ |
2904 | case MIGRATION_STATUS_FAILED: | |
2905 | case MIGRATION_STATUS_CANCELLED: | |
57225e5f | 2906 | case MIGRATION_STATUS_CANCELLING: |
f4584076 | 2907 | if (s->vm_old_state == RUN_STATE_RUNNING) { |
aa505f8e RL |
2908 | if (!runstate_check(RUN_STATE_SHUTDOWN)) { |
2909 | vm_start(); | |
2910 | } | |
199aa6d4 PX |
2911 | } else { |
2912 | if (runstate_check(RUN_STATE_FINISH_MIGRATE)) { | |
a4c6275a | 2913 | runstate_set(s->vm_old_state); |
199aa6d4 PX |
2914 | } |
2915 | } | |
2916 | break; | |
2917 | ||
2918 | default: | |
2919 | /* Should not reach here, but if so, forgive the VM. */ | |
2920 | error_report("%s: Unknown ending state %d", __func__, s->state); | |
2921 | break; | |
2922 | } | |
fd392cfa | 2923 | migrate_fd_cleanup_schedule(s); |
199aa6d4 PX |
2924 | qemu_mutex_unlock_iothread(); |
2925 | } | |
2926 | ||
8518278a AG |
2927 | static void bg_migration_iteration_finish(MigrationState *s) |
2928 | { | |
3a8b81f2 FE |
2929 | /* |
2930 | * Stop tracking RAM writes - un-protect memory, un-register UFFD | |
2931 | * memory ranges, flush kernel wait queues and wake up threads | |
2932 | * waiting for write fault to be resolved. | |
2933 | */ | |
2934 | ram_write_tracking_stop(); | |
2935 | ||
8518278a AG |
2936 | qemu_mutex_lock_iothread(); |
2937 | switch (s->state) { | |
2938 | case MIGRATION_STATUS_COMPLETED: | |
2939 | migration_calculate_complete(s); | |
2940 | break; | |
2941 | ||
2942 | case MIGRATION_STATUS_ACTIVE: | |
2943 | case MIGRATION_STATUS_FAILED: | |
2944 | case MIGRATION_STATUS_CANCELLED: | |
2945 | case MIGRATION_STATUS_CANCELLING: | |
2946 | break; | |
2947 | ||
2948 | default: | |
2949 | /* Should not reach here, but if so, forgive the VM. */ | |
2950 | error_report("%s: Unknown ending state %d", __func__, s->state); | |
2951 | break; | |
2952 | } | |
2953 | ||
2954 | migrate_fd_cleanup_schedule(s); | |
2955 | qemu_mutex_unlock_iothread(); | |
2956 | } | |
2957 | ||
2958 | /* | |
2959 | * Return true if continue to the next iteration directly, false | |
2960 | * otherwise. | |
2961 | */ | |
2962 | static MigIterateState bg_migration_iteration_run(MigrationState *s) | |
2963 | { | |
2964 | int res; | |
2965 | ||
2966 | res = qemu_savevm_state_iterate(s->to_dst_file, false); | |
2967 | if (res > 0) { | |
2968 | bg_migration_completion(s); | |
2969 | return MIG_ITERATE_BREAK; | |
2970 | } | |
2971 | ||
2972 | return MIG_ITERATE_RESUME; | |
2973 | } | |
2974 | ||
ad767bed DDAG |
2975 | void migration_make_urgent_request(void) |
2976 | { | |
2977 | qemu_sem_post(&migrate_get_current()->rate_limit_sem); | |
2978 | } | |
2979 | ||
2980 | void migration_consume_urgent_request(void) | |
2981 | { | |
2982 | qemu_sem_wait(&migrate_get_current()->rate_limit_sem); | |
2983 | } | |
2984 | ||
97e1e067 DDAG |
2985 | /* Returns true if the rate limiting was broken by an urgent request */ |
2986 | bool migration_rate_limit(void) | |
2987 | { | |
2988 | int64_t now = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
2989 | MigrationState *s = migrate_get_current(); | |
2990 | ||
2991 | bool urgent = false; | |
2992 | migration_update_counters(s, now); | |
e1fde0e0 | 2993 | if (migration_rate_exceeded(s->to_dst_file)) { |
77386127 LS |
2994 | |
2995 | if (qemu_file_get_error(s->to_dst_file)) { | |
2996 | return false; | |
2997 | } | |
97e1e067 DDAG |
2998 | /* |
2999 | * Wait for a delay to do rate limiting OR | |
3000 | * something urgent to post the semaphore. | |
3001 | */ | |
3002 | int ms = s->iteration_start_time + BUFFER_DELAY - now; | |
3003 | trace_migration_rate_limit_pre(ms); | |
3004 | if (qemu_sem_timedwait(&s->rate_limit_sem, ms) == 0) { | |
3005 | /* | |
3006 | * We were woken by one or more urgent things but | |
3007 | * the timedwait will have consumed one of them. | |
3008 | * The service routine for the urgent wake will dec | |
3009 | * the semaphore itself for each item it consumes, | |
3010 | * so add this one we just eat back. | |
3011 | */ | |
3012 | qemu_sem_post(&s->rate_limit_sem); | |
3013 | urgent = true; | |
3014 | } | |
3015 | trace_migration_rate_limit_post(urgent); | |
3016 | } | |
3017 | return urgent; | |
3018 | } | |
3019 | ||
fde93d99 LV |
3020 | /* |
3021 | * if failover devices are present, wait they are completely | |
3022 | * unplugged | |
3023 | */ | |
3024 | ||
3025 | static void qemu_savevm_wait_unplug(MigrationState *s, int old_state, | |
3026 | int new_state) | |
3027 | { | |
3028 | if (qemu_savevm_state_guest_unplug_pending()) { | |
3029 | migrate_set_state(&s->state, old_state, MIGRATION_STATUS_WAIT_UNPLUG); | |
3030 | ||
3031 | while (s->state == MIGRATION_STATUS_WAIT_UNPLUG && | |
3032 | qemu_savevm_state_guest_unplug_pending()) { | |
3033 | qemu_sem_timedwait(&s->wait_unplug_sem, 250); | |
3034 | } | |
944bc528 LV |
3035 | if (s->state != MIGRATION_STATUS_WAIT_UNPLUG) { |
3036 | int timeout = 120; /* 30 seconds */ | |
3037 | /* | |
3038 | * migration has been canceled | |
3039 | * but as we have started an unplug we must wait the end | |
3040 | * to be able to plug back the card | |
3041 | */ | |
3042 | while (timeout-- && qemu_savevm_state_guest_unplug_pending()) { | |
3043 | qemu_sem_timedwait(&s->wait_unplug_sem, 250); | |
3044 | } | |
1b529d90 LV |
3045 | if (qemu_savevm_state_guest_unplug_pending() && |
3046 | !qtest_enabled()) { | |
a51dcef0 LV |
3047 | warn_report("migration: partially unplugged device on " |
3048 | "failure"); | |
3049 | } | |
944bc528 | 3050 | } |
fde93d99 LV |
3051 | |
3052 | migrate_set_state(&s->state, MIGRATION_STATUS_WAIT_UNPLUG, new_state); | |
3053 | } else { | |
3054 | migrate_set_state(&s->state, old_state, new_state); | |
3055 | } | |
3056 | } | |
3057 | ||
70b20477 DDAG |
3058 | /* |
3059 | * Master migration thread on the source VM. | |
3060 | * It drives the migration and pumps the data down the outgoing channel. | |
3061 | */ | |
5f496a1b | 3062 | static void *migration_thread(void *opaque) |
0d82d0e8 | 3063 | { |
9848a404 | 3064 | MigrationState *s = opaque; |
1b1f4ab6 | 3065 | MigrationThread *thread = NULL; |
bc72ad67 | 3066 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); |
b23c2ade | 3067 | MigThrError thr_error; |
ad767bed | 3068 | bool urgent = false; |
76f5933a | 3069 | |
788fa680 | 3070 | thread = migration_threads_add("live_migration", qemu_get_thread_id()); |
1b1f4ab6 | 3071 | |
ab28bd23 PB |
3072 | rcu_register_thread(); |
3073 | ||
892ae715 | 3074 | object_ref(OBJECT(s)); |
87f3bd87 | 3075 | update_iteration_initial_status(s); |
b15df1ae | 3076 | |
930e239d | 3077 | qemu_mutex_lock_iothread(); |
89a02a9f | 3078 | qemu_savevm_state_header(s->to_dst_file); |
930e239d | 3079 | qemu_mutex_unlock_iothread(); |
1d34e4bf | 3080 | |
62a02658 PX |
3081 | /* |
3082 | * If we opened the return path, we need to make sure dst has it | |
3083 | * opened as well. | |
3084 | */ | |
43044ac0 | 3085 | if (s->rp_state.rp_thread_created) { |
1d34e4bf | 3086 | /* Now tell the dest that it should open its end so it can reply */ |
89a02a9f | 3087 | qemu_savevm_send_open_return_path(s->to_dst_file); |
1d34e4bf DDAG |
3088 | |
3089 | /* And do a ping that will make stuff easier to debug */ | |
89a02a9f | 3090 | qemu_savevm_send_ping(s->to_dst_file, 1); |
0425dc97 | 3091 | } |
1d34e4bf | 3092 | |
58110f0a | 3093 | if (migrate_postcopy()) { |
1d34e4bf DDAG |
3094 | /* |
3095 | * Tell the destination that we *might* want to do postcopy later; | |
3096 | * if the other end can't do postcopy it should fail now, nice and | |
3097 | * early. | |
3098 | */ | |
89a02a9f | 3099 | qemu_savevm_send_postcopy_advise(s->to_dst_file); |
1d34e4bf DDAG |
3100 | } |
3101 | ||
5e804644 | 3102 | if (migrate_colo()) { |
aad555c2 ZC |
3103 | /* Notify migration destination that we enable COLO */ |
3104 | qemu_savevm_send_colo_enable(s->to_dst_file); | |
3105 | } | |
3106 | ||
930e239d | 3107 | qemu_mutex_lock_iothread(); |
9907e842 | 3108 | qemu_savevm_state_setup(s->to_dst_file); |
930e239d | 3109 | qemu_mutex_unlock_iothread(); |
0d82d0e8 | 3110 | |
fde93d99 LV |
3111 | qemu_savevm_wait_unplug(s, MIGRATION_STATUS_SETUP, |
3112 | MIGRATION_STATUS_ACTIVE); | |
c7e0acd5 | 3113 | |
bc72ad67 | 3114 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; |
29ae8a41 | 3115 | |
9ec055ae DDAG |
3116 | trace_migration_thread_setup_complete(); |
3117 | ||
8f8d528e | 3118 | while (migration_is_active(s)) { |
e1fde0e0 | 3119 | if (urgent || !migration_rate_exceeded(s->to_dst_file)) { |
2ad87305 PX |
3120 | MigIterateState iter_state = migration_iteration_run(s); |
3121 | if (iter_state == MIG_ITERATE_SKIP) { | |
3122 | continue; | |
3123 | } else if (iter_state == MIG_ITERATE_BREAK) { | |
09f6c85e | 3124 | break; |
c369f40d JQ |
3125 | } |
3126 | } | |
f4410a5d | 3127 | |
b23c2ade PX |
3128 | /* |
3129 | * Try to detect any kind of failures, and see whether we | |
3130 | * should stop the migration now. | |
3131 | */ | |
3132 | thr_error = migration_detect_error(s); | |
3133 | if (thr_error == MIG_THR_ERR_FATAL) { | |
3134 | /* Stop migration */ | |
fd45ee2c | 3135 | break; |
b23c2ade PX |
3136 | } else if (thr_error == MIG_THR_ERR_RECOVERED) { |
3137 | /* | |
3138 | * Just recovered from a e.g. network failure, reset all | |
3139 | * the local variables. This is important to avoid | |
3140 | * breaking transferred_bytes and bandwidth calculation | |
3141 | */ | |
87f3bd87 | 3142 | update_iteration_initial_status(s); |
fd45ee2c | 3143 | } |
b15df1ae | 3144 | |
97e1e067 | 3145 | urgent = migration_rate_limit(); |
a3fa1d78 PB |
3146 | } |
3147 | ||
1d34e4bf | 3148 | trace_migration_thread_after_loop(); |
199aa6d4 | 3149 | migration_iteration_finish(s); |
892ae715 | 3150 | object_unref(OBJECT(s)); |
ab28bd23 | 3151 | rcu_unregister_thread(); |
788fa680 | 3152 | migration_threads_remove(thread); |
0d82d0e8 JQ |
3153 | return NULL; |
3154 | } | |
3155 | ||
8518278a AG |
3156 | static void bg_migration_vm_start_bh(void *opaque) |
3157 | { | |
3158 | MigrationState *s = opaque; | |
3159 | ||
3160 | qemu_bh_delete(s->vm_start_bh); | |
3161 | s->vm_start_bh = NULL; | |
3162 | ||
3163 | vm_start(); | |
e22ffad0 | 3164 | migration_downtime_end(s); |
8518278a AG |
3165 | } |
3166 | ||
3167 | /** | |
3168 | * Background snapshot thread, based on live migration code. | |
3169 | * This is an alternative implementation of live migration mechanism | |
3170 | * introduced specifically to support background snapshots. | |
3171 | * | |
3172 | * It takes advantage of userfault_fd write protection mechanism introduced | |
3173 | * in v5.7 kernel. Compared to existing dirty page logging migration much | |
3174 | * lesser stream traffic is produced resulting in smaller snapshot images, | |
3175 | * simply cause of no page duplicates can get into the stream. | |
3176 | * | |
3177 | * Another key point is that generated vmstate stream reflects machine state | |
3178 | * 'frozen' at the beginning of snapshot creation compared to dirty page logging | |
3179 | * mechanism, which effectively results in that saved snapshot is the state of VM | |
3180 | * at the end of the process. | |
3181 | */ | |
3182 | static void *bg_migration_thread(void *opaque) | |
3183 | { | |
3184 | MigrationState *s = opaque; | |
3185 | int64_t setup_start; | |
3186 | MigThrError thr_error; | |
3187 | QEMUFile *fb; | |
3188 | bool early_fail = true; | |
3189 | ||
3190 | rcu_register_thread(); | |
3191 | object_ref(OBJECT(s)); | |
3192 | ||
e1fde0e0 | 3193 | migration_rate_set(RATE_LIMIT_DISABLED); |
8518278a AG |
3194 | |
3195 | setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); | |
3196 | /* | |
3197 | * We want to save vmstate for the moment when migration has been | |
3198 | * initiated but also we want to save RAM content while VM is running. | |
3199 | * The RAM content should appear first in the vmstate. So, we first | |
3200 | * stash the non-RAM part of the vmstate to the temporary buffer, | |
3201 | * then write RAM part of the vmstate to the migration stream | |
3202 | * with vCPUs running and, finally, write stashed non-RAM part of | |
3203 | * the vmstate from the buffer to the migration stream. | |
3204 | */ | |
ecb23efe | 3205 | s->bioc = qio_channel_buffer_new(512 * 1024); |
8518278a | 3206 | qio_channel_set_name(QIO_CHANNEL(s->bioc), "vmstate-buffer"); |
77ef2dc1 | 3207 | fb = qemu_file_new_output(QIO_CHANNEL(s->bioc)); |
8518278a AG |
3208 | object_unref(OBJECT(s->bioc)); |
3209 | ||
3210 | update_iteration_initial_status(s); | |
3211 | ||
eeccb99c AG |
3212 | /* |
3213 | * Prepare for tracking memory writes with UFFD-WP - populate | |
3214 | * RAM pages before protecting. | |
3215 | */ | |
3216 | #ifdef __linux__ | |
3217 | ram_write_tracking_prepare(); | |
3218 | #endif | |
3219 | ||
930e239d | 3220 | qemu_mutex_lock_iothread(); |
8518278a AG |
3221 | qemu_savevm_state_header(s->to_dst_file); |
3222 | qemu_savevm_state_setup(s->to_dst_file); | |
930e239d | 3223 | qemu_mutex_unlock_iothread(); |
8518278a | 3224 | |
fde93d99 LV |
3225 | qemu_savevm_wait_unplug(s, MIGRATION_STATUS_SETUP, |
3226 | MIGRATION_STATUS_ACTIVE); | |
8518278a | 3227 | |
8518278a AG |
3228 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; |
3229 | ||
3230 | trace_migration_thread_setup_complete(); | |
e22ffad0 | 3231 | migration_downtime_start(s); |
8518278a AG |
3232 | |
3233 | qemu_mutex_lock_iothread(); | |
3234 | ||
3235 | /* | |
3236 | * If VM is currently in suspended state, then, to make a valid runstate | |
3237 | * transition in vm_stop_force_state() we need to wakeup it up. | |
3238 | */ | |
3239 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); | |
f4584076 | 3240 | s->vm_old_state = runstate_get(); |
8518278a | 3241 | |
c33f1829 | 3242 | global_state_store(); |
8518278a | 3243 | /* Forcibly stop VM before saving state of vCPUs and devices */ |
93bdf888 | 3244 | if (migration_stop_vm(RUN_STATE_PAUSED)) { |
8518278a AG |
3245 | goto fail; |
3246 | } | |
3247 | /* | |
3248 | * Put vCPUs in sync with shadow context structures, then | |
3249 | * save their state to channel-buffer along with devices. | |
3250 | */ | |
3251 | cpu_synchronize_all_states(); | |
3252 | if (qemu_savevm_state_complete_precopy_non_iterable(fb, false, false)) { | |
3253 | goto fail; | |
3254 | } | |
ecb23efe AG |
3255 | /* |
3256 | * Since we are going to get non-iterable state data directly | |
3257 | * from s->bioc->data, explicit flush is needed here. | |
3258 | */ | |
3259 | qemu_fflush(fb); | |
3260 | ||
8518278a AG |
3261 | /* Now initialize UFFD context and start tracking RAM writes */ |
3262 | if (ram_write_tracking_start()) { | |
3263 | goto fail; | |
3264 | } | |
3265 | early_fail = false; | |
3266 | ||
3267 | /* | |
3268 | * Start VM from BH handler to avoid write-fault lock here. | |
3269 | * UFFD-WP protection for the whole RAM is already enabled so | |
3270 | * calling VM state change notifiers from vm_start() would initiate | |
3271 | * writes to virtio VQs memory which is in write-protected region. | |
3272 | */ | |
3273 | s->vm_start_bh = qemu_bh_new(bg_migration_vm_start_bh, s); | |
3274 | qemu_bh_schedule(s->vm_start_bh); | |
3275 | ||
3276 | qemu_mutex_unlock_iothread(); | |
3277 | ||
3278 | while (migration_is_active(s)) { | |
3279 | MigIterateState iter_state = bg_migration_iteration_run(s); | |
3280 | if (iter_state == MIG_ITERATE_SKIP) { | |
3281 | continue; | |
3282 | } else if (iter_state == MIG_ITERATE_BREAK) { | |
3283 | break; | |
3284 | } | |
3285 | ||
3286 | /* | |
3287 | * Try to detect any kind of failures, and see whether we | |
3288 | * should stop the migration now. | |
3289 | */ | |
3290 | thr_error = migration_detect_error(s); | |
3291 | if (thr_error == MIG_THR_ERR_FATAL) { | |
3292 | /* Stop migration */ | |
3293 | break; | |
3294 | } | |
3295 | ||
3296 | migration_update_counters(s, qemu_clock_get_ms(QEMU_CLOCK_REALTIME)); | |
3297 | } | |
3298 | ||
3299 | trace_migration_thread_after_loop(); | |
3300 | ||
3301 | fail: | |
3302 | if (early_fail) { | |
3303 | migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE, | |
3304 | MIGRATION_STATUS_FAILED); | |
3305 | qemu_mutex_unlock_iothread(); | |
3306 | } | |
3307 | ||
3308 | bg_migration_iteration_finish(s); | |
3309 | ||
3310 | qemu_fclose(fb); | |
3311 | object_unref(OBJECT(s)); | |
3312 | rcu_unregister_thread(); | |
3313 | ||
3314 | return NULL; | |
3315 | } | |
3316 | ||
cce8040b | 3317 | void migrate_fd_connect(MigrationState *s, Error *error_in) |
0d82d0e8 | 3318 | { |
00f4b572 | 3319 | Error *local_err = NULL; |
52033349 | 3320 | uint64_t rate_limit; |
d3e35b8f PX |
3321 | bool resume = s->state == MIGRATION_STATUS_POSTCOPY_PAUSED; |
3322 | ||
ca7bd082 PX |
3323 | /* |
3324 | * If there's a previous error, free it and prepare for another one. | |
3325 | * Meanwhile if migration completes successfully, there won't have an error | |
3326 | * dumped when calling migrate_fd_cleanup(). | |
3327 | */ | |
3328 | migrate_error_free(s); | |
3329 | ||
f5da8ba4 | 3330 | s->expected_downtime = migrate_downtime_limit(); |
9cbc3649 MAL |
3331 | if (resume) { |
3332 | assert(s->cleanup_bh); | |
3333 | } else { | |
3334 | assert(!s->cleanup_bh); | |
3335 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup_bh, s); | |
3336 | } | |
cce8040b DDAG |
3337 | if (error_in) { |
3338 | migrate_fd_error(s, error_in); | |
ca30f24d PX |
3339 | if (resume) { |
3340 | /* | |
3341 | * Don't do cleanup for resume if channel is invalid, but only dump | |
3342 | * the error. We wait for another channel connect from the user. | |
3343 | * The error_report still gives HMP user a hint on what failed. | |
3344 | * It's normally done in migrate_fd_cleanup(), but call it here | |
3345 | * explicitly. | |
3346 | */ | |
3347 | error_report_err(error_copy(s->error)); | |
3348 | } else { | |
3349 | migrate_fd_cleanup(s); | |
3350 | } | |
cce8040b DDAG |
3351 | return; |
3352 | } | |
0d82d0e8 | 3353 | |
d3e35b8f PX |
3354 | if (resume) { |
3355 | /* This is a resumed migration */ | |
9d3ebbe2 | 3356 | rate_limit = migrate_max_postcopy_bandwidth(); |
d3e35b8f PX |
3357 | } else { |
3358 | /* This is a fresh new migration */ | |
9d3ebbe2 | 3359 | rate_limit = migrate_max_bandwidth(); |
442773ce | 3360 | |
d3e35b8f | 3361 | /* Notify before starting migration thread */ |
d9cda213 | 3362 | migration_call_notifiers(s); |
d3e35b8f PX |
3363 | } |
3364 | ||
e1fde0e0 | 3365 | migration_rate_set(rate_limit); |
d3e35b8f | 3366 | qemu_file_set_blocking(s->to_dst_file, true); |
9287ac27 | 3367 | |
1d34e4bf | 3368 | /* |
c788ada8 PX |
3369 | * Open the return path. For postcopy, it is used exclusively. For |
3370 | * precopy, only if user specified "return-path" capability would | |
3371 | * QEMU uses the return path. | |
1d34e4bf | 3372 | */ |
38ad1110 | 3373 | if (migrate_postcopy_ram() || migrate_return_path()) { |
ef796ee9 | 3374 | if (open_return_path_on_source(s)) { |
908927db | 3375 | error_setg(&local_err, "Unable to open return-path for postcopy"); |
d3e35b8f | 3376 | migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED); |
908927db TG |
3377 | migrate_set_error(s, local_err); |
3378 | error_report_err(local_err); | |
1d34e4bf DDAG |
3379 | migrate_fd_cleanup(s); |
3380 | return; | |
3381 | } | |
3382 | } | |
3383 | ||
06064a67 PX |
3384 | /* |
3385 | * This needs to be done before resuming a postcopy. Note: for newer | |
3386 | * QEMUs we will delay the channel creation until postcopy_start(), to | |
3387 | * avoid disorder of channel creations. | |
3388 | */ | |
3389 | if (migrate_postcopy_preempt() && s->preempt_pre_7_2) { | |
3390 | postcopy_preempt_setup(s); | |
3391 | } | |
3392 | ||
d3e35b8f | 3393 | if (resume) { |
135b87b4 PX |
3394 | /* Wakeup the main migration thread to do the recovery */ |
3395 | migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_PAUSED, | |
3396 | MIGRATION_STATUS_POSTCOPY_RECOVER); | |
3397 | qemu_sem_post(&s->postcopy_pause_sem); | |
d3e35b8f PX |
3398 | return; |
3399 | } | |
3400 | ||
00f4b572 | 3401 | if (multifd_save_setup(&local_err) != 0) { |
908927db | 3402 | migrate_set_error(s, local_err); |
00f4b572 | 3403 | error_report_err(local_err); |
f986c3d2 JQ |
3404 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
3405 | MIGRATION_STATUS_FAILED); | |
3406 | migrate_fd_cleanup(s); | |
3407 | return; | |
3408 | } | |
8518278a AG |
3409 | |
3410 | if (migrate_background_snapshot()) { | |
3411 | qemu_thread_create(&s->thread, "bg_snapshot", | |
3412 | bg_migration_thread, s, QEMU_THREAD_JOINABLE); | |
3413 | } else { | |
3414 | qemu_thread_create(&s->thread, "live_migration", | |
3415 | migration_thread, s, QEMU_THREAD_JOINABLE); | |
3416 | } | |
1d34e4bf | 3417 | s->migration_thread_running = true; |
0d82d0e8 | 3418 | } |
093e3c42 | 3419 | |
e5cb7e76 PX |
3420 | static void migration_class_init(ObjectClass *klass, void *data) |
3421 | { | |
3422 | DeviceClass *dc = DEVICE_CLASS(klass); | |
3423 | ||
3424 | dc->user_creatable = false; | |
4f67d30b | 3425 | device_class_set_props(dc, migration_properties); |
e5cb7e76 PX |
3426 | } |
3427 | ||
b91bf5e4 MAL |
3428 | static void migration_instance_finalize(Object *obj) |
3429 | { | |
3430 | MigrationState *ms = MIGRATION_OBJ(obj); | |
b91bf5e4 | 3431 | |
87db1a7d | 3432 | qemu_mutex_destroy(&ms->error_mutex); |
62df066f | 3433 | qemu_mutex_destroy(&ms->qemu_file_lock); |
c7e0acd5 | 3434 | qemu_sem_destroy(&ms->wait_unplug_sem); |
ad767bed | 3435 | qemu_sem_destroy(&ms->rate_limit_sem); |
e91d8951 | 3436 | qemu_sem_destroy(&ms->pause_sem); |
b23c2ade | 3437 | qemu_sem_destroy(&ms->postcopy_pause_sem); |
edd090c7 | 3438 | qemu_sem_destroy(&ms->rp_state.rp_sem); |
b28fb582 | 3439 | qemu_sem_destroy(&ms->rp_state.rp_pong_acks); |
d0edb8a1 | 3440 | qemu_sem_destroy(&ms->postcopy_qemufile_src_sem); |
ab105cc1 | 3441 | error_free(ms->error); |
b91bf5e4 MAL |
3442 | } |
3443 | ||
e5cb7e76 PX |
3444 | static void migration_instance_init(Object *obj) |
3445 | { | |
3446 | MigrationState *ms = MIGRATION_OBJ(obj); | |
3447 | ||
3448 | ms->state = MIGRATION_STATUS_NONE; | |
e5cb7e76 | 3449 | ms->mbps = -1; |
aecbfe9c | 3450 | ms->pages_per_second = -1; |
e91d8951 | 3451 | qemu_sem_init(&ms->pause_sem, 0); |
87db1a7d | 3452 | qemu_mutex_init(&ms->error_mutex); |
8b0b29dc | 3453 | |
61a174e2 | 3454 | migrate_params_init(&ms->parameters); |
b23c2ade PX |
3455 | |
3456 | qemu_sem_init(&ms->postcopy_pause_sem, 0); | |
edd090c7 | 3457 | qemu_sem_init(&ms->rp_state.rp_sem, 0); |
b28fb582 | 3458 | qemu_sem_init(&ms->rp_state.rp_pong_acks, 0); |
ad767bed | 3459 | qemu_sem_init(&ms->rate_limit_sem, 0); |
c7e0acd5 | 3460 | qemu_sem_init(&ms->wait_unplug_sem, 0); |
d0edb8a1 | 3461 | qemu_sem_init(&ms->postcopy_qemufile_src_sem, 0); |
62df066f | 3462 | qemu_mutex_init(&ms->qemu_file_lock); |
8b0b29dc PX |
3463 | } |
3464 | ||
3465 | /* | |
3466 | * Return true if check pass, false otherwise. Error will be put | |
3467 | * inside errp if provided. | |
3468 | */ | |
3469 | static bool migration_object_check(MigrationState *ms, Error **errp) | |
3470 | { | |
6b19a7d9 | 3471 | /* Assuming all off */ |
b02c7fc9 | 3472 | bool old_caps[MIGRATION_CAPABILITY__MAX] = { 0 }; |
6b19a7d9 | 3473 | |
8b0b29dc PX |
3474 | if (!migrate_params_check(&ms->parameters, errp)) { |
3475 | return false; | |
3476 | } | |
3477 | ||
b02c7fc9 | 3478 | return migrate_caps_check(old_caps, ms->capabilities, errp); |
e5cb7e76 PX |
3479 | } |
3480 | ||
3481 | static const TypeInfo migration_type = { | |
3482 | .name = TYPE_MIGRATION, | |
01f6e14c | 3483 | /* |
c8d3ff38 | 3484 | * NOTE: TYPE_MIGRATION is not really a device, as the object is |
2194abd6 | 3485 | * not created using qdev_new(), it is not attached to the qdev |
c8d3ff38 PX |
3486 | * device tree, and it is never realized. |
3487 | * | |
3488 | * TODO: Make this TYPE_OBJECT once QOM provides something like | |
3489 | * TYPE_DEVICE's "-global" properties. | |
01f6e14c | 3490 | */ |
e5cb7e76 PX |
3491 | .parent = TYPE_DEVICE, |
3492 | .class_init = migration_class_init, | |
3493 | .class_size = sizeof(MigrationClass), | |
3494 | .instance_size = sizeof(MigrationState), | |
3495 | .instance_init = migration_instance_init, | |
b91bf5e4 | 3496 | .instance_finalize = migration_instance_finalize, |
e5cb7e76 PX |
3497 | }; |
3498 | ||
3499 | static void register_migration_types(void) | |
3500 | { | |
3501 | type_register_static(&migration_type); | |
3502 | } | |
3503 | ||
3504 | type_init(register_migration_types); |