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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" |
61e8b148 | 23 | #include "socket.h" |
54d31236 | 24 | #include "sysemu/runstate.h" |
46517dd4 | 25 | #include "sysemu/sysemu.h" |
b0c3cf94 | 26 | #include "sysemu/cpu-throttle.h" |
e1a3ecee | 27 | #include "rdma.h" |
7b1e1a22 | 28 | #include "ram.h" |
84a899de | 29 | #include "migration/global_state.h" |
c4b63b7c | 30 | #include "migration/misc.h" |
6666c96a | 31 | #include "migration.h" |
20a519a0 | 32 | #include "savevm.h" |
08a0aee1 | 33 | #include "qemu-file.h" |
6720c2b3 | 34 | #include "channel.h" |
987772d9 | 35 | #include "migration/vmstate.h" |
737e150e | 36 | #include "block/block.h" |
e688df6b | 37 | #include "qapi/error.h" |
9aca82ba | 38 | #include "qapi/clone-visitor.h" |
31e4c354 | 39 | #include "qapi/qapi-visit-migration.h" |
9aca82ba | 40 | #include "qapi/qapi-visit-sockets.h" |
9af23989 MA |
41 | #include "qapi/qapi-commands-migration.h" |
42 | #include "qapi/qapi-events-migration.h" | |
cc7a8ea7 | 43 | #include "qapi/qmp/qerror.h" |
15280c36 | 44 | #include "qapi/qmp/qnull.h" |
ab28bd23 | 45 | #include "qemu/rcu.h" |
2c9e6fec | 46 | #include "block.h" |
be07b0ac | 47 | #include "postcopy-ram.h" |
766bd176 | 48 | #include "qemu/thread.h" |
c09e5bb1 | 49 | #include "trace.h" |
51180423 | 50 | #include "exec/target_page.h" |
61b67d47 | 51 | #include "io/channel-buffer.h" |
85a8578e | 52 | #include "io/channel-tls.h" |
35a6ed4f | 53 | #include "migration/colo.h" |
4ffdb337 | 54 | #include "hw/boards.h" |
9d18af93 | 55 | #include "monitor/monitor.h" |
50510ea2 | 56 | #include "net/announce.h" |
c7e0acd5 | 57 | #include "qemu/queue.h" |
d32ca5ad | 58 | #include "multifd.h" |
1b1f4ab6 | 59 | #include "threadinfo.h" |
b5eea99e | 60 | #include "qemu/yank.h" |
6e8c25b4 | 61 | #include "sysemu/cpus.h" |
39675fff | 62 | #include "yank_functions.h" |
1b529d90 | 63 | #include "sysemu/qtest.h" |
1f0776f1 | 64 | #include "options.h" |
065e2813 | 65 | |
99a0db9b GH |
66 | static NotifierList migration_state_notifiers = |
67 | NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); | |
68 | ||
da6f1790 JQ |
69 | /* Messages sent on the return path from destination to source */ |
70 | enum mig_rp_message_type { | |
71 | MIG_RP_MSG_INVALID = 0, /* Must be 0 */ | |
72 | MIG_RP_MSG_SHUT, /* sibling will not send any more RP messages */ | |
73 | MIG_RP_MSG_PONG, /* Response to a PING; data (seq: be32 ) */ | |
74 | ||
75 | MIG_RP_MSG_REQ_PAGES_ID, /* data (start: be64, len: be32, id: string) */ | |
76 | MIG_RP_MSG_REQ_PAGES, /* data (start: be64, len: be32) */ | |
a335debb | 77 | MIG_RP_MSG_RECV_BITMAP, /* send recved_bitmap back to source */ |
13955b89 | 78 | MIG_RP_MSG_RESUME_ACK, /* tell source that we are ready to resume */ |
da6f1790 JQ |
79 | |
80 | MIG_RP_MSG_MAX | |
81 | }; | |
82 | ||
17549e84 JQ |
83 | /* When we add fault tolerance, we could have several |
84 | migrations at once. For now we don't need to add | |
85 | dynamic creation of migration */ | |
86 | ||
e5cb7e76 | 87 | static MigrationState *current_migration; |
e1b1b1bc | 88 | static MigrationIncomingState *current_incoming; |
e5cb7e76 | 89 | |
3af8554b DDAG |
90 | static GSList *migration_blockers; |
91 | ||
8b0b29dc | 92 | static bool migration_object_check(MigrationState *ms, Error **errp); |
0331c8ca DDAG |
93 | static int migration_maybe_pause(MigrationState *s, |
94 | int *current_active_state, | |
95 | int new_state); | |
892ae715 | 96 | static void migrate_fd_cancel(MigrationState *s); |
8b0b29dc | 97 | |
d6f74fd1 PX |
98 | static bool migration_needs_multiple_sockets(void) |
99 | { | |
51b07548 | 100 | return migrate_multifd() || migrate_postcopy_preempt(); |
d6f74fd1 | 101 | } |
f444eeda | 102 | |
d6f74fd1 | 103 | static bool uri_supports_multi_channels(const char *uri) |
f444eeda | 104 | { |
d6f74fd1 PX |
105 | return strstart(uri, "tcp:", NULL) || strstart(uri, "unix:", NULL) || |
106 | strstart(uri, "vsock:", NULL); | |
f444eeda PX |
107 | } |
108 | ||
d6f74fd1 PX |
109 | static bool |
110 | migration_channels_and_uri_compatible(const char *uri, Error **errp) | |
f444eeda | 111 | { |
d6f74fd1 PX |
112 | if (migration_needs_multiple_sockets() && |
113 | !uri_supports_multi_channels(uri)) { | |
114 | error_setg(errp, "Migration requires multi-channel URIs (e.g. tcp)"); | |
115 | return false; | |
116 | } | |
117 | ||
118 | return true; | |
f444eeda PX |
119 | } |
120 | ||
8f8bfffc PX |
121 | static gint page_request_addr_cmp(gconstpointer ap, gconstpointer bp) |
122 | { | |
123 | uintptr_t a = (uintptr_t) ap, b = (uintptr_t) bp; | |
124 | ||
125 | return (a > b) - (a < b); | |
126 | } | |
127 | ||
e5cb7e76 PX |
128 | void migration_object_init(void) |
129 | { | |
130 | /* This can only be called once. */ | |
131 | assert(!current_migration); | |
132 | current_migration = MIGRATION_OBJ(object_new(TYPE_MIGRATION)); | |
4ffdb337 | 133 | |
e1b1b1bc PX |
134 | /* |
135 | * Init the migrate incoming object as well no matter whether | |
136 | * we'll use it or not. | |
137 | */ | |
138 | assert(!current_incoming); | |
139 | current_incoming = g_new0(MigrationIncomingState, 1); | |
140 | current_incoming->state = MIGRATION_STATUS_NONE; | |
141 | current_incoming->postcopy_remote_fds = | |
142 | g_array_new(FALSE, TRUE, sizeof(struct PostCopyFD)); | |
143 | qemu_mutex_init(¤t_incoming->rp_mutex); | |
60bb3c58 | 144 | qemu_mutex_init(¤t_incoming->postcopy_prio_thread_mutex); |
e1b1b1bc PX |
145 | qemu_event_init(¤t_incoming->main_thread_load_event, false); |
146 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_dst, 0); | |
147 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_fault, 0); | |
60bb3c58 | 148 | qemu_sem_init(¤t_incoming->postcopy_pause_sem_fast_load, 0); |
5655aab0 PX |
149 | qemu_sem_init(¤t_incoming->postcopy_qemufile_dst_done, 0); |
150 | ||
8f8bfffc PX |
151 | qemu_mutex_init(¤t_incoming->page_request_mutex); |
152 | current_incoming->page_requested = g_tree_new(page_request_addr_cmp); | |
e1b1b1bc | 153 | |
f9734d5d | 154 | migration_object_check(current_migration, &error_fatal); |
e0d17dfd PB |
155 | |
156 | blk_mig_init(); | |
157 | ram_mig_init(); | |
158 | dirty_bitmap_mig_init(); | |
e5cb7e76 PX |
159 | } |
160 | ||
458fecca | 161 | void migration_cancel(const Error *error) |
c7c0e724 | 162 | { |
458fecca LV |
163 | if (error) { |
164 | migrate_set_error(current_migration, error); | |
165 | } | |
c7c0e724 DH |
166 | migrate_fd_cancel(current_migration); |
167 | } | |
168 | ||
892ae715 | 169 | void migration_shutdown(void) |
1f895604 | 170 | { |
795969ab RL |
171 | /* |
172 | * When the QEMU main thread exit, the COLO thread | |
173 | * may wait a semaphore. So, we should wakeup the | |
174 | * COLO thread before migration shutdown. | |
175 | */ | |
176 | colo_shutdown(); | |
892ae715 DDAG |
177 | /* |
178 | * Cancel the current migration - that will (eventually) | |
179 | * stop the migration using this structure | |
180 | */ | |
458fecca | 181 | migration_cancel(NULL); |
1f895604 | 182 | object_unref(OBJECT(current_migration)); |
1499ab09 VSO |
183 | |
184 | /* | |
185 | * Cancel outgoing migration of dirty bitmaps. It should | |
186 | * at least unref used block nodes. | |
187 | */ | |
188 | dirty_bitmap_mig_cancel_outgoing(); | |
189 | ||
190 | /* | |
191 | * Cancel incoming migration of dirty bitmaps. Dirty bitmaps | |
192 | * are non-critical data, and their loss never considered as | |
193 | * something serious. | |
194 | */ | |
195 | dirty_bitmap_mig_cancel_incoming(); | |
1f895604 VSO |
196 | } |
197 | ||
bca7856a | 198 | /* For outgoing */ |
859bc756 | 199 | MigrationState *migrate_get_current(void) |
17549e84 | 200 | { |
e5cb7e76 PX |
201 | /* This can only be called after the object created. */ |
202 | assert(current_migration); | |
203 | return current_migration; | |
17549e84 JQ |
204 | } |
205 | ||
bca7856a DDAG |
206 | MigrationIncomingState *migration_incoming_get_current(void) |
207 | { | |
e1b1b1bc PX |
208 | assert(current_incoming); |
209 | return current_incoming; | |
bca7856a DDAG |
210 | } |
211 | ||
e031149c PX |
212 | void migration_incoming_transport_cleanup(MigrationIncomingState *mis) |
213 | { | |
214 | if (mis->socket_address_list) { | |
215 | qapi_free_SocketAddressList(mis->socket_address_list); | |
216 | mis->socket_address_list = NULL; | |
217 | } | |
218 | ||
219 | if (mis->transport_cleanup) { | |
220 | mis->transport_cleanup(mis->transport_data); | |
221 | mis->transport_data = mis->transport_cleanup = NULL; | |
222 | } | |
223 | } | |
224 | ||
bca7856a DDAG |
225 | void migration_incoming_state_destroy(void) |
226 | { | |
b4b076da JQ |
227 | struct MigrationIncomingState *mis = migration_incoming_get_current(); |
228 | ||
cfc3bcf3 LB |
229 | multifd_load_cleanup(); |
230 | ||
3482655b | 231 | if (mis->to_src_file) { |
660819b1 PX |
232 | /* Tell source that we are done */ |
233 | migrate_send_rp_shut(mis, qemu_file_get_error(mis->from_src_file) != 0); | |
3482655b PX |
234 | qemu_fclose(mis->to_src_file); |
235 | mis->to_src_file = NULL; | |
236 | } | |
237 | ||
660819b1 | 238 | if (mis->from_src_file) { |
39675fff | 239 | migration_ioc_unregister_yank_from_file(mis->from_src_file); |
660819b1 PX |
240 | qemu_fclose(mis->from_src_file); |
241 | mis->from_src_file = NULL; | |
242 | } | |
00fa4fc8 DDAG |
243 | if (mis->postcopy_remote_fds) { |
244 | g_array_free(mis->postcopy_remote_fds, TRUE); | |
245 | mis->postcopy_remote_fds = NULL; | |
246 | } | |
660819b1 | 247 | |
e031149c | 248 | migration_incoming_transport_cleanup(mis); |
1783c00f DDAG |
249 | qemu_event_reset(&mis->main_thread_load_event); |
250 | ||
8f8bfffc PX |
251 | if (mis->page_requested) { |
252 | g_tree_destroy(mis->page_requested); | |
253 | mis->page_requested = NULL; | |
254 | } | |
255 | ||
36f62f11 PX |
256 | if (mis->postcopy_qemufile_dst) { |
257 | migration_ioc_unregister_yank_from_file(mis->postcopy_qemufile_dst); | |
258 | qemu_fclose(mis->postcopy_qemufile_dst); | |
259 | mis->postcopy_qemufile_dst = NULL; | |
260 | } | |
261 | ||
b5eea99e | 262 | yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
bca7856a DDAG |
263 | } |
264 | ||
b05dc723 JQ |
265 | static void migrate_generate_event(int new_state) |
266 | { | |
b890902c | 267 | if (migrate_events()) { |
3ab72385 | 268 | qapi_event_send_migration(new_state); |
b05dc723 JQ |
269 | } |
270 | } | |
271 | ||
da6f1790 JQ |
272 | /* |
273 | * Send a message on the return channel back to the source | |
274 | * of the migration. | |
275 | */ | |
d6208e35 PX |
276 | static int migrate_send_rp_message(MigrationIncomingState *mis, |
277 | enum mig_rp_message_type message_type, | |
278 | uint16_t len, void *data) | |
da6f1790 | 279 | { |
d6208e35 PX |
280 | int ret = 0; |
281 | ||
da6f1790 | 282 | trace_migrate_send_rp_message((int)message_type, len); |
37396950 | 283 | QEMU_LOCK_GUARD(&mis->rp_mutex); |
d6208e35 PX |
284 | |
285 | /* | |
286 | * It's possible that the file handle got lost due to network | |
287 | * failures. | |
288 | */ | |
289 | if (!mis->to_src_file) { | |
290 | ret = -EIO; | |
37396950 | 291 | return ret; |
d6208e35 PX |
292 | } |
293 | ||
da6f1790 JQ |
294 | qemu_put_be16(mis->to_src_file, (unsigned int)message_type); |
295 | qemu_put_be16(mis->to_src_file, len); | |
296 | qemu_put_buffer(mis->to_src_file, data, len); | |
297 | qemu_fflush(mis->to_src_file); | |
d6208e35 PX |
298 | |
299 | /* It's possible that qemu file got error during sending */ | |
300 | ret = qemu_file_get_error(mis->to_src_file); | |
301 | ||
d6208e35 | 302 | return ret; |
da6f1790 JQ |
303 | } |
304 | ||
2e2bce16 PX |
305 | /* Request one page from the source VM at the given start address. |
306 | * rb: the RAMBlock to request the page in | |
1e2d90eb DDAG |
307 | * Start: Address offset within the RB |
308 | * Len: Length in bytes required - must be a multiple of pagesize | |
309 | */ | |
7a267fc4 PX |
310 | int migrate_send_rp_message_req_pages(MigrationIncomingState *mis, |
311 | RAMBlock *rb, ram_addr_t start) | |
1e2d90eb | 312 | { |
cb8d4c8f | 313 | uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */ |
1e2d90eb | 314 | size_t msglen = 12; /* start + len */ |
2e2bce16 | 315 | size_t len = qemu_ram_pagesize(rb); |
d6208e35 | 316 | enum mig_rp_message_type msg_type; |
2e2bce16 PX |
317 | const char *rbname; |
318 | int rbname_len; | |
1e2d90eb DDAG |
319 | |
320 | *(uint64_t *)bufc = cpu_to_be64((uint64_t)start); | |
321 | *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len); | |
322 | ||
2e2bce16 PX |
323 | /* |
324 | * We maintain the last ramblock that we requested for page. Note that we | |
325 | * don't need locking because this function will only be called within the | |
326 | * postcopy ram fault thread. | |
327 | */ | |
328 | if (rb != mis->last_rb) { | |
329 | mis->last_rb = rb; | |
330 | ||
331 | rbname = qemu_ram_get_idstr(rb); | |
332 | rbname_len = strlen(rbname); | |
333 | ||
1e2d90eb DDAG |
334 | assert(rbname_len < 256); |
335 | ||
336 | bufc[msglen++] = rbname_len; | |
337 | memcpy(bufc + msglen, rbname, rbname_len); | |
338 | msglen += rbname_len; | |
d6208e35 | 339 | msg_type = MIG_RP_MSG_REQ_PAGES_ID; |
1e2d90eb | 340 | } else { |
d6208e35 | 341 | msg_type = MIG_RP_MSG_REQ_PAGES; |
1e2d90eb | 342 | } |
d6208e35 PX |
343 | |
344 | return migrate_send_rp_message(mis, msg_type, msglen, bufc); | |
1e2d90eb DDAG |
345 | } |
346 | ||
7a267fc4 | 347 | int migrate_send_rp_req_pages(MigrationIncomingState *mis, |
8f8bfffc | 348 | RAMBlock *rb, ram_addr_t start, uint64_t haddr) |
7a267fc4 | 349 | { |
7648297d | 350 | void *aligned = (void *)(uintptr_t)ROUND_DOWN(haddr, qemu_ram_pagesize(rb)); |
a2429283 | 351 | bool received = false; |
8f8bfffc PX |
352 | |
353 | WITH_QEMU_LOCK_GUARD(&mis->page_request_mutex) { | |
354 | received = ramblock_recv_bitmap_test_byte_offset(rb, start); | |
355 | if (!received && !g_tree_lookup(mis->page_requested, aligned)) { | |
356 | /* | |
357 | * The page has not been received, and it's not yet in the page | |
358 | * request list. Queue it. Set the value of element to 1, so that | |
359 | * things like g_tree_lookup() will return TRUE (1) when found. | |
360 | */ | |
361 | g_tree_insert(mis->page_requested, aligned, (gpointer)1); | |
362 | mis->page_requested_count++; | |
363 | trace_postcopy_page_req_add(aligned, mis->page_requested_count); | |
364 | } | |
365 | } | |
366 | ||
367 | /* | |
368 | * If the page is there, skip sending the message. We don't even need the | |
369 | * lock because as long as the page arrived, it'll be there forever. | |
370 | */ | |
371 | if (received) { | |
372 | return 0; | |
373 | } | |
374 | ||
7a267fc4 PX |
375 | return migrate_send_rp_message_req_pages(mis, rb, start); |
376 | } | |
377 | ||
aad555c2 ZC |
378 | static bool migration_colo_enabled; |
379 | bool migration_incoming_colo_enabled(void) | |
380 | { | |
381 | return migration_colo_enabled; | |
382 | } | |
383 | ||
384 | void migration_incoming_disable_colo(void) | |
385 | { | |
18b1d3c9 | 386 | ram_block_discard_disable(false); |
aad555c2 ZC |
387 | migration_colo_enabled = false; |
388 | } | |
389 | ||
18b1d3c9 | 390 | int migration_incoming_enable_colo(void) |
aad555c2 | 391 | { |
18b1d3c9 DH |
392 | if (ram_block_discard_disable(true)) { |
393 | error_report("COLO: cannot disable RAM discard"); | |
394 | return -EBUSY; | |
395 | } | |
aad555c2 | 396 | migration_colo_enabled = true; |
18b1d3c9 | 397 | return 0; |
aad555c2 ZC |
398 | } |
399 | ||
9aca82ba JQ |
400 | void migrate_add_address(SocketAddress *address) |
401 | { | |
402 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
9aca82ba | 403 | |
54aa3de7 EB |
404 | QAPI_LIST_PREPEND(mis->socket_address_list, |
405 | QAPI_CLONE(SocketAddress, address)); | |
9aca82ba JQ |
406 | } |
407 | ||
e69d50d6 | 408 | static void qemu_start_incoming_migration(const char *uri, Error **errp) |
5bb7910a | 409 | { |
d658f65c | 410 | const char *p = NULL; |
34c9dd8e | 411 | |
d6f74fd1 PX |
412 | /* URI is not suitable for migration? */ |
413 | if (!migration_channels_and_uri_compatible(uri, errp)) { | |
414 | return; | |
415 | } | |
416 | ||
3ab72385 | 417 | qapi_event_send_migration(MIGRATION_STATUS_SETUP); |
e69d50d6 PB |
418 | if (strstart(uri, "tcp:", &p) || |
419 | strstart(uri, "unix:", NULL) || | |
420 | strstart(uri, "vsock:", NULL)) { | |
d658f65c | 421 | socket_start_incoming_migration(p ? p : uri, errp); |
2da776db | 422 | #ifdef CONFIG_RDMA |
adde220a | 423 | } else if (strstart(uri, "rdma:", &p)) { |
2da776db MH |
424 | rdma_start_incoming_migration(p, errp); |
425 | #endif | |
adde220a | 426 | } else if (strstart(uri, "exec:", &p)) { |
43eaae28 | 427 | exec_start_incoming_migration(p, errp); |
adde220a | 428 | } else if (strstart(uri, "fd:", &p)) { |
43eaae28 | 429 | fd_start_incoming_migration(p, errp); |
adde220a | 430 | } else { |
312fd5f2 | 431 | error_setg(errp, "unknown migration protocol: %s", uri); |
8ca5e801 | 432 | } |
5bb7910a AL |
433 | } |
434 | ||
0aa6aefc DL |
435 | static void process_incoming_migration_bh(void *opaque) |
436 | { | |
437 | Error *local_err = NULL; | |
438 | MigrationIncomingState *mis = opaque; | |
439 | ||
0f073f44 DDAG |
440 | /* If capability late_block_activate is set: |
441 | * Only fire up the block code now if we're going to restart the | |
442 | * VM, else 'cont' will do it. | |
443 | * This causes file locking to happen; so we don't want it to happen | |
444 | * unless we really are starting the VM. | |
445 | */ | |
446 | if (!migrate_late_block_activate() || | |
447 | (autostart && (!global_state_received() || | |
448 | global_state_get_runstate() == RUN_STATE_RUNNING))) { | |
3b717194 | 449 | /* Make sure all file formats throw away their mutable metadata. |
0f073f44 | 450 | * If we get an error here, just don't restart the VM yet. */ |
3b717194 | 451 | bdrv_activate_all(&local_err); |
0f073f44 DDAG |
452 | if (local_err) { |
453 | error_report_err(local_err); | |
454 | local_err = NULL; | |
455 | autostart = false; | |
456 | } | |
d35ff5e6 KW |
457 | } |
458 | ||
0aa6aefc DL |
459 | /* |
460 | * This must happen after all error conditions are dealt with and | |
461 | * we're sure the VM is going to be running on this host. | |
462 | */ | |
7659505c | 463 | qemu_announce_self(&mis->announce_timer, migrate_announce_params()); |
0aa6aefc | 464 | |
cfc3bcf3 | 465 | multifd_load_shutdown(); |
0aa6aefc | 466 | |
b35ebdf0 VSO |
467 | dirty_bitmap_mig_before_vm_start(); |
468 | ||
0aa6aefc DL |
469 | if (!global_state_received() || |
470 | global_state_get_runstate() == RUN_STATE_RUNNING) { | |
471 | if (autostart) { | |
472 | vm_start(); | |
473 | } else { | |
474 | runstate_set(RUN_STATE_PAUSED); | |
475 | } | |
db009729 ZC |
476 | } else if (migration_incoming_colo_enabled()) { |
477 | migration_incoming_disable_colo(); | |
478 | vm_start(); | |
0aa6aefc DL |
479 | } else { |
480 | runstate_set(global_state_get_runstate()); | |
481 | } | |
0aa6aefc DL |
482 | /* |
483 | * This must happen after any state changes since as soon as an external | |
484 | * observer sees this event they might start to prod at the VM assuming | |
485 | * it's ready to use. | |
486 | */ | |
487 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
488 | MIGRATION_STATUS_COMPLETED); | |
489 | qemu_bh_delete(mis->bh); | |
490 | migration_incoming_state_destroy(); | |
491 | } | |
492 | ||
38e8f9af MAL |
493 | static void coroutine_fn |
494 | process_incoming_migration_co(void *opaque) | |
511c0231 | 495 | { |
b4b076da | 496 | MigrationIncomingState *mis = migration_incoming_get_current(); |
e9bef235 | 497 | PostcopyState ps; |
1c12e1f5 | 498 | int ret; |
8e48ac95 | 499 | Error *local_err = NULL; |
1c12e1f5 | 500 | |
4f0fae7f | 501 | assert(mis->from_src_file); |
92370989 | 502 | mis->migration_incoming_co = qemu_coroutine_self(); |
67f11b5c | 503 | mis->largest_page_size = qemu_ram_pagesize_largest(); |
093e3c42 | 504 | postcopy_state_set(POSTCOPY_INCOMING_NONE); |
93d7af6f HZ |
505 | migrate_set_state(&mis->state, MIGRATION_STATUS_NONE, |
506 | MIGRATION_STATUS_ACTIVE); | |
4f0fae7f | 507 | ret = qemu_loadvm_state(mis->from_src_file); |
bca7856a | 508 | |
e9bef235 DDAG |
509 | ps = postcopy_state_get(); |
510 | trace_process_incoming_migration_co_end(ret, ps); | |
511 | if (ps != POSTCOPY_INCOMING_NONE) { | |
512 | if (ps == POSTCOPY_INCOMING_ADVISE) { | |
513 | /* | |
514 | * Where a migration had postcopy enabled (and thus went to advise) | |
515 | * but managed to complete within the precopy period, we can use | |
516 | * the normal exit. | |
517 | */ | |
518 | postcopy_ram_incoming_cleanup(mis); | |
519 | } else if (ret >= 0) { | |
520 | /* | |
521 | * Postcopy was started, cleanup should happen at the end of the | |
522 | * postcopy thread. | |
523 | */ | |
524 | trace_process_incoming_migration_co_postcopy_end_main(); | |
525 | return; | |
526 | } | |
527 | /* Else if something went wrong then just fall out of the normal exit */ | |
528 | } | |
529 | ||
25d0c16f | 530 | /* we get COLO info, and know if we are in COLO mode */ |
aad555c2 | 531 | if (!ret && migration_incoming_colo_enabled()) { |
3b717194 EGE |
532 | /* Make sure all file formats throw away their mutable metadata */ |
533 | bdrv_activate_all(&local_err); | |
8e48ac95 | 534 | if (local_err) { |
8e48ac95 | 535 | error_report_err(local_err); |
6d99c2d4 | 536 | goto fail; |
8e48ac95 ZC |
537 | } |
538 | ||
25d0c16f HZ |
539 | qemu_thread_create(&mis->colo_incoming_thread, "COLO incoming", |
540 | colo_process_incoming_thread, mis, QEMU_THREAD_JOINABLE); | |
541 | mis->have_colo_incoming_thread = true; | |
542 | qemu_coroutine_yield(); | |
543 | ||
684bfd18 | 544 | qemu_mutex_unlock_iothread(); |
25d0c16f HZ |
545 | /* Wait checkpoint incoming thread exit before free resource */ |
546 | qemu_thread_join(&mis->colo_incoming_thread); | |
684bfd18 | 547 | qemu_mutex_lock_iothread(); |
13af18f2 ZC |
548 | /* We hold the global iothread lock, so it is safe here */ |
549 | colo_release_ram_cache(); | |
25d0c16f HZ |
550 | } |
551 | ||
1c12e1f5 | 552 | if (ret < 0) { |
db80face | 553 | error_report("load of migration failed: %s", strerror(-ret)); |
6d99c2d4 | 554 | goto fail; |
511c0231 | 555 | } |
0aa6aefc DL |
556 | mis->bh = qemu_bh_new(process_incoming_migration_bh, mis); |
557 | qemu_bh_schedule(mis->bh); | |
92370989 | 558 | mis->migration_incoming_co = NULL; |
6d99c2d4 FL |
559 | return; |
560 | fail: | |
561 | local_err = NULL; | |
562 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, | |
563 | MIGRATION_STATUS_FAILED); | |
564 | qemu_fclose(mis->from_src_file); | |
e5bac1f5 LB |
565 | |
566 | multifd_load_cleanup(); | |
567 | ||
6d99c2d4 | 568 | exit(EXIT_FAILURE); |
511c0231 JQ |
569 | } |
570 | ||
b673eab4 | 571 | /** |
7d6f6933 | 572 | * migration_incoming_setup: Setup incoming migration |
b673eab4 JQ |
573 | * @f: file for main migration channel |
574 | * @errp: where to put errors | |
7d6f6933 MA |
575 | * |
576 | * Returns: %true on success, %false on error. | |
b673eab4 | 577 | */ |
7d6f6933 | 578 | static bool migration_incoming_setup(QEMUFile *f, Error **errp) |
82a4da79 | 579 | { |
4f0fae7f | 580 | MigrationIncomingState *mis = migration_incoming_get_current(); |
82a4da79 | 581 | |
4f0fae7f JQ |
582 | if (!mis->from_src_file) { |
583 | mis->from_src_file = f; | |
584 | } | |
06ad5135 | 585 | qemu_file_set_blocking(f, false); |
7d6f6933 | 586 | return true; |
e595a01a JQ |
587 | } |
588 | ||
36c2f8be | 589 | void migration_incoming_process(void) |
e595a01a JQ |
590 | { |
591 | Coroutine *co = qemu_coroutine_create(process_incoming_migration_co, NULL); | |
0b8b8753 | 592 | qemu_coroutine_enter(co); |
82a4da79 PB |
593 | } |
594 | ||
884835fa | 595 | /* Returns true if recovered from a paused migration, otherwise false */ |
a39e9339 | 596 | static bool postcopy_try_recover(void) |
e595a01a | 597 | { |
d96c9e8d PX |
598 | MigrationIncomingState *mis = migration_incoming_get_current(); |
599 | ||
600 | if (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
601 | /* Resumed from a paused postcopy migration */ | |
602 | ||
a39e9339 PX |
603 | /* This should be set already in migration_incoming_setup() */ |
604 | assert(mis->from_src_file); | |
d96c9e8d | 605 | /* Postcopy has standalone thread to do vm load */ |
a39e9339 | 606 | qemu_file_set_blocking(mis->from_src_file, true); |
d96c9e8d PX |
607 | |
608 | /* Re-configure the return path */ | |
a39e9339 | 609 | mis->to_src_file = qemu_file_get_return_path(mis->from_src_file); |
d96c9e8d PX |
610 | |
611 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_PAUSED, | |
612 | MIGRATION_STATUS_POSTCOPY_RECOVER); | |
613 | ||
614 | /* | |
615 | * Here, we only wake up the main loading thread (while the | |
60bb3c58 | 616 | * rest threads will still be waiting), so that we can receive |
d96c9e8d | 617 | * commands from source now, and answer it if needed. The |
60bb3c58 | 618 | * rest threads will be woken up afterwards until we are sure |
d96c9e8d PX |
619 | * that source is ready to reply to page requests. |
620 | */ | |
621 | qemu_sem_post(&mis->postcopy_pause_sem_dst); | |
884835fa PX |
622 | return true; |
623 | } | |
624 | ||
625 | return false; | |
626 | } | |
627 | ||
b673eab4 | 628 | void migration_fd_process_incoming(QEMUFile *f, Error **errp) |
884835fa | 629 | { |
a39e9339 | 630 | if (!migration_incoming_setup(f, errp)) { |
884835fa | 631 | return; |
d96c9e8d | 632 | } |
a39e9339 | 633 | if (postcopy_try_recover()) { |
b673eab4 JQ |
634 | return; |
635 | } | |
884835fa | 636 | migration_incoming_process(); |
e595a01a JQ |
637 | } |
638 | ||
5655aab0 PX |
639 | /* |
640 | * Returns true when we want to start a new incoming migration process, | |
641 | * false otherwise. | |
642 | */ | |
643 | static bool migration_should_start_incoming(bool main_channel) | |
644 | { | |
645 | /* Multifd doesn't start unless all channels are established */ | |
51b07548 | 646 | if (migrate_multifd()) { |
5655aab0 PX |
647 | return migration_has_all_channels(); |
648 | } | |
649 | ||
650 | /* Preempt channel only starts when the main channel is created */ | |
651 | if (migrate_postcopy_preempt()) { | |
652 | return main_channel; | |
653 | } | |
654 | ||
655 | /* | |
656 | * For all the rest types of migration, we should only reach here when | |
657 | * it's the main channel that's being created, and we should always | |
658 | * proceed with this channel. | |
659 | */ | |
660 | assert(main_channel); | |
661 | return true; | |
662 | } | |
663 | ||
49ed0d24 | 664 | void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp) |
4f0fae7f JQ |
665 | { |
666 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
b673eab4 | 667 | Error *local_err = NULL; |
36f62f11 | 668 | QEMUFile *f; |
6720c2b3 | 669 | bool default_channel = true; |
670 | uint32_t channel_magic = 0; | |
671 | int ret = 0; | |
4f0fae7f | 672 | |
51b07548 | 673 | if (migrate_multifd() && !migrate_postcopy_ram() && |
6720c2b3 | 674 | qio_channel_has_feature(ioc, QIO_CHANNEL_FEATURE_READ_MSG_PEEK)) { |
675 | /* | |
676 | * With multiple channels, it is possible that we receive channels | |
677 | * out of order on destination side, causing incorrect mapping of | |
678 | * source channels on destination side. Check channel MAGIC to | |
679 | * decide type of channel. Please note this is best effort, postcopy | |
680 | * preempt channel does not send any magic number so avoid it for | |
681 | * postcopy live migration. Also tls live migration already does | |
682 | * tls handshake while initializing main channel so with tls this | |
683 | * issue is not possible. | |
684 | */ | |
685 | ret = migration_channel_read_peek(ioc, (void *)&channel_magic, | |
686 | sizeof(channel_magic), &local_err); | |
687 | ||
688 | if (ret != 0) { | |
689 | error_propagate(errp, local_err); | |
690 | return; | |
691 | } | |
692 | ||
693 | default_channel = (channel_magic == cpu_to_be32(QEMU_VM_FILE_MAGIC)); | |
694 | } else { | |
695 | default_channel = !mis->from_src_file; | |
696 | } | |
697 | ||
698 | if (multifd_load_setup(errp) != 0) { | |
699 | error_setg(errp, "Failed to setup multifd channels"); | |
700 | return; | |
701 | } | |
702 | ||
703 | if (default_channel) { | |
36f62f11 | 704 | f = qemu_file_new_input(ioc); |
a429e7f4 | 705 | |
7d6f6933 | 706 | if (!migration_incoming_setup(f, errp)) { |
b673eab4 JQ |
707 | return; |
708 | } | |
a429e7f4 PX |
709 | } else { |
710 | /* Multiple connections */ | |
36f62f11 | 711 | assert(migration_needs_multiple_sockets()); |
51b07548 | 712 | if (migrate_multifd()) { |
6720c2b3 | 713 | multifd_recv_new_channel(ioc, &local_err); |
36f62f11 PX |
714 | } else { |
715 | assert(migrate_postcopy_preempt()); | |
716 | f = qemu_file_new_input(ioc); | |
6720c2b3 | 717 | postcopy_preempt_new_channel(mis, f); |
36f62f11 | 718 | } |
49ed0d24 FL |
719 | if (local_err) { |
720 | error_propagate(errp, local_err); | |
721 | return; | |
722 | } | |
4f0fae7f | 723 | } |
81e62053 | 724 | |
5655aab0 | 725 | if (migration_should_start_incoming(default_channel)) { |
a39e9339 PX |
726 | /* If it's a recovery, we're done */ |
727 | if (postcopy_try_recover()) { | |
728 | return; | |
729 | } | |
81e62053 PX |
730 | migration_incoming_process(); |
731 | } | |
4f0fae7f JQ |
732 | } |
733 | ||
428d8908 JQ |
734 | /** |
735 | * @migration_has_all_channels: We have received all channels that we need | |
736 | * | |
737 | * Returns true when we have got connections to all the channels that | |
738 | * we need for migration. | |
739 | */ | |
740 | bool migration_has_all_channels(void) | |
741 | { | |
ca273df3 | 742 | MigrationIncomingState *mis = migration_incoming_get_current(); |
62c1e0ca | 743 | |
36f62f11 PX |
744 | if (!mis->from_src_file) { |
745 | return false; | |
746 | } | |
62c1e0ca | 747 | |
51b07548 | 748 | if (migrate_multifd()) { |
36f62f11 PX |
749 | return multifd_recv_all_channels_created(); |
750 | } | |
751 | ||
752 | if (migrate_postcopy_preempt()) { | |
753 | return mis->postcopy_qemufile_dst != NULL; | |
754 | } | |
755 | ||
756 | return true; | |
428d8908 JQ |
757 | } |
758 | ||
6decec93 DDAG |
759 | /* |
760 | * Send a 'SHUT' message on the return channel with the given value | |
761 | * to indicate that we've finished with the RP. Non-0 value indicates | |
762 | * error. | |
763 | */ | |
764 | void migrate_send_rp_shut(MigrationIncomingState *mis, | |
765 | uint32_t value) | |
766 | { | |
767 | uint32_t buf; | |
768 | ||
769 | buf = cpu_to_be32(value); | |
770 | migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf); | |
771 | } | |
772 | ||
773 | /* | |
774 | * Send a 'PONG' message on the return channel with the given value | |
775 | * (normally in response to a 'PING') | |
776 | */ | |
777 | void migrate_send_rp_pong(MigrationIncomingState *mis, | |
778 | uint32_t value) | |
779 | { | |
780 | uint32_t buf; | |
781 | ||
782 | buf = cpu_to_be32(value); | |
783 | migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf); | |
784 | } | |
785 | ||
a335debb PX |
786 | void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis, |
787 | char *block_name) | |
788 | { | |
789 | char buf[512]; | |
790 | int len; | |
791 | int64_t res; | |
792 | ||
793 | /* | |
794 | * First, we send the header part. It contains only the len of | |
795 | * idstr, and the idstr itself. | |
796 | */ | |
797 | len = strlen(block_name); | |
798 | buf[0] = len; | |
799 | memcpy(buf + 1, block_name, len); | |
800 | ||
801 | if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
802 | error_report("%s: MSG_RP_RECV_BITMAP only used for recovery", | |
803 | __func__); | |
804 | return; | |
805 | } | |
806 | ||
807 | migrate_send_rp_message(mis, MIG_RP_MSG_RECV_BITMAP, len + 1, buf); | |
808 | ||
809 | /* | |
810 | * Next, we dump the received bitmap to the stream. | |
811 | * | |
812 | * TODO: currently we are safe since we are the only one that is | |
813 | * using the to_src_file handle (fault thread is still paused), | |
814 | * and it's ok even not taking the mutex. However the best way is | |
815 | * to take the lock before sending the message header, and release | |
816 | * the lock after sending the bitmap. | |
817 | */ | |
818 | qemu_mutex_lock(&mis->rp_mutex); | |
819 | res = ramblock_recv_bitmap_send(mis->to_src_file, block_name); | |
820 | qemu_mutex_unlock(&mis->rp_mutex); | |
821 | ||
822 | trace_migrate_send_rp_recv_bitmap(block_name, res); | |
823 | } | |
824 | ||
13955b89 PX |
825 | void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value) |
826 | { | |
827 | uint32_t buf; | |
828 | ||
829 | buf = cpu_to_be32(value); | |
830 | migrate_send_rp_message(mis, MIG_RP_MSG_RESUME_ACK, sizeof(buf), &buf); | |
831 | } | |
832 | ||
f6844b99 DDAG |
833 | /* |
834 | * Return true if we're already in the middle of a migration | |
835 | * (i.e. any of the active or setup states) | |
836 | */ | |
3d63da16 | 837 | bool migration_is_setup_or_active(int state) |
f6844b99 DDAG |
838 | { |
839 | switch (state) { | |
840 | case MIGRATION_STATUS_ACTIVE: | |
9ec055ae | 841 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
a688d2c1 | 842 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
135b87b4 | 843 | case MIGRATION_STATUS_POSTCOPY_RECOVER: |
f6844b99 | 844 | case MIGRATION_STATUS_SETUP: |
31e06077 DDAG |
845 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
846 | case MIGRATION_STATUS_DEVICE: | |
c7e0acd5 | 847 | case MIGRATION_STATUS_WAIT_UNPLUG: |
19dd408a | 848 | case MIGRATION_STATUS_COLO: |
f6844b99 DDAG |
849 | return true; |
850 | ||
851 | default: | |
852 | return false; | |
853 | ||
854 | } | |
855 | } | |
856 | ||
392d87e2 JQ |
857 | bool migration_is_running(int state) |
858 | { | |
859 | switch (state) { | |
860 | case MIGRATION_STATUS_ACTIVE: | |
861 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
862 | case MIGRATION_STATUS_POSTCOPY_PAUSED: | |
863 | case MIGRATION_STATUS_POSTCOPY_RECOVER: | |
864 | case MIGRATION_STATUS_SETUP: | |
865 | case MIGRATION_STATUS_PRE_SWITCHOVER: | |
866 | case MIGRATION_STATUS_DEVICE: | |
867 | case MIGRATION_STATUS_WAIT_UNPLUG: | |
868 | case MIGRATION_STATUS_CANCELLING: | |
392d87e2 JQ |
869 | return true; |
870 | ||
871 | default: | |
872 | return false; | |
873 | ||
874 | } | |
875 | } | |
876 | ||
db18dee7 PX |
877 | static bool migrate_show_downtime(MigrationState *s) |
878 | { | |
879 | return (s->state == MIGRATION_STATUS_COMPLETED) || migration_in_postcopy(); | |
880 | } | |
881 | ||
640dfb14 WY |
882 | static void populate_time_info(MigrationInfo *info, MigrationState *s) |
883 | { | |
884 | info->has_status = true; | |
885 | info->has_setup_time = true; | |
886 | info->setup_time = s->setup_time; | |
db18dee7 | 887 | |
640dfb14 WY |
888 | if (s->state == MIGRATION_STATUS_COMPLETED) { |
889 | info->has_total_time = true; | |
890 | info->total_time = s->total_time; | |
640dfb14 WY |
891 | } else { |
892 | info->has_total_time = true; | |
893 | info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - | |
894 | s->start_time; | |
db18dee7 PX |
895 | } |
896 | ||
897 | if (migrate_show_downtime(s)) { | |
898 | info->has_downtime = true; | |
899 | info->downtime = s->downtime; | |
900 | } else { | |
640dfb14 WY |
901 | info->has_expected_downtime = true; |
902 | info->expected_downtime = s->expected_downtime; | |
903 | } | |
904 | } | |
905 | ||
a22463a5 DDAG |
906 | static void populate_ram_info(MigrationInfo *info, MigrationState *s) |
907 | { | |
144fa06b JQ |
908 | size_t page_size = qemu_target_page_size(); |
909 | ||
a22463a5 | 910 | info->ram = g_malloc0(sizeof(*info->ram)); |
abce5fa1 | 911 | info->ram->transferred = stat64_get(&ram_counters.transferred); |
a22463a5 | 912 | info->ram->total = ram_bytes_total(); |
1a386e8d | 913 | info->ram->duplicate = stat64_get(&ram_counters.zero_pages); |
bedf53c1 JQ |
914 | /* legacy value. It is not used anymore */ |
915 | info->ram->skipped = 0; | |
8c0cda8f | 916 | info->ram->normal = stat64_get(&ram_counters.normal_pages); |
23b7576d | 917 | info->ram->normal_bytes = info->ram->normal * page_size; |
a22463a5 | 918 | info->ram->mbps = s->mbps; |
536b5a4e JQ |
919 | info->ram->dirty_sync_count = |
920 | stat64_get(&ram_counters.dirty_sync_count); | |
cf20c897 | 921 | info->ram->dirty_sync_missed_zero_copy = |
42918236 | 922 | stat64_get(&ram_counters.dirty_sync_missed_zero_copy); |
3c764f9b JQ |
923 | info->ram->postcopy_requests = |
924 | stat64_get(&ram_counters.postcopy_requests); | |
144fa06b | 925 | info->ram->page_size = page_size; |
cf671116 | 926 | info->ram->multifd_bytes = stat64_get(&ram_counters.multifd_bytes); |
aecbfe9c | 927 | info->ram->pages_per_second = s->pages_per_second; |
b013b5d1 | 928 | info->ram->precopy_bytes = stat64_get(&ram_counters.precopy_bytes); |
296a4ac2 | 929 | info->ram->downtime_bytes = stat64_get(&ram_counters.downtime_bytes); |
abce5fa1 | 930 | info->ram->postcopy_bytes = stat64_get(&ram_counters.postcopy_bytes); |
a22463a5 | 931 | |
87dca0c9 | 932 | if (migrate_xbzrle()) { |
114f5aee JQ |
933 | info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache)); |
934 | info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); | |
9360447d JQ |
935 | info->xbzrle_cache->bytes = xbzrle_counters.bytes; |
936 | info->xbzrle_cache->pages = xbzrle_counters.pages; | |
937 | info->xbzrle_cache->cache_miss = xbzrle_counters.cache_miss; | |
938 | info->xbzrle_cache->cache_miss_rate = xbzrle_counters.cache_miss_rate; | |
e460a4b1 | 939 | info->xbzrle_cache->encoding_rate = xbzrle_counters.encoding_rate; |
9360447d | 940 | info->xbzrle_cache->overflow = xbzrle_counters.overflow; |
114f5aee JQ |
941 | } |
942 | ||
a7a94d14 | 943 | if (migrate_compress()) { |
76e03000 XG |
944 | info->compression = g_malloc0(sizeof(*info->compression)); |
945 | info->compression->pages = compression_counters.pages; | |
946 | info->compression->busy = compression_counters.busy; | |
947 | info->compression->busy_rate = compression_counters.busy_rate; | |
948 | info->compression->compressed_size = | |
949 | compression_counters.compressed_size; | |
950 | info->compression->compression_rate = | |
951 | compression_counters.compression_rate; | |
952 | } | |
953 | ||
338182c8 JQ |
954 | if (cpu_throttle_active()) { |
955 | info->has_cpu_throttle_percentage = true; | |
956 | info->cpu_throttle_percentage = cpu_throttle_get_percentage(); | |
957 | } | |
958 | ||
a22463a5 DDAG |
959 | if (s->state != MIGRATION_STATUS_COMPLETED) { |
960 | info->ram->remaining = ram_bytes_remaining(); | |
72f8e587 JQ |
961 | info->ram->dirty_pages_rate = |
962 | stat64_get(&ram_counters.dirty_pages_rate); | |
a22463a5 DDAG |
963 | } |
964 | } | |
965 | ||
930ac04c JQ |
966 | static void populate_disk_info(MigrationInfo *info) |
967 | { | |
968 | if (blk_mig_active()) { | |
930ac04c JQ |
969 | info->disk = g_malloc0(sizeof(*info->disk)); |
970 | info->disk->transferred = blk_mig_bytes_transferred(); | |
971 | info->disk->remaining = blk_mig_bytes_remaining(); | |
972 | info->disk->total = blk_mig_bytes_total(); | |
973 | } | |
974 | } | |
975 | ||
65ace060 | 976 | static void fill_source_migration_info(MigrationInfo *info) |
5bb7910a | 977 | { |
17549e84 | 978 | MigrationState *s = migrate_get_current(); |
552de79b | 979 | int state = qatomic_read(&s->state); |
372043f3 | 980 | GSList *cur_blocker = migration_blockers; |
17549e84 | 981 | |
3af8554b | 982 | info->blocked_reasons = NULL; |
3af8554b | 983 | |
372043f3 MA |
984 | /* |
985 | * There are two types of reasons a migration might be blocked; | |
986 | * a) devices marked in VMState as non-migratable, and | |
987 | * b) Explicit migration blockers | |
988 | * We need to add both of them here. | |
989 | */ | |
990 | qemu_savevm_non_migratable_list(&info->blocked_reasons); | |
3af8554b | 991 | |
372043f3 MA |
992 | while (cur_blocker) { |
993 | QAPI_LIST_PREPEND(info->blocked_reasons, | |
994 | g_strdup(error_get_pretty(cur_blocker->data))); | |
995 | cur_blocker = g_slist_next(cur_blocker); | |
3af8554b | 996 | } |
372043f3 | 997 | info->has_blocked_reasons = info->blocked_reasons != NULL; |
3af8554b | 998 | |
552de79b | 999 | switch (state) { |
31194731 | 1000 | case MIGRATION_STATUS_NONE: |
17549e84 | 1001 | /* no migration has happened ever */ |
65ace060 AP |
1002 | /* do not overwrite destination migration status */ |
1003 | return; | |
31194731 | 1004 | case MIGRATION_STATUS_SETUP: |
29ae8a41 | 1005 | info->has_status = true; |
ed4fbd10 | 1006 | info->has_total_time = false; |
29ae8a41 | 1007 | break; |
31194731 HZ |
1008 | case MIGRATION_STATUS_ACTIVE: |
1009 | case MIGRATION_STATUS_CANCELLING: | |
9ec055ae | 1010 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: |
31e06077 DDAG |
1011 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
1012 | case MIGRATION_STATUS_DEVICE: | |
a688d2c1 | 1013 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
135b87b4 | 1014 | case MIGRATION_STATUS_POSTCOPY_RECOVER: |
640dfb14 WY |
1015 | /* TODO add some postcopy stats */ |
1016 | populate_time_info(info, s); | |
a22463a5 | 1017 | populate_ram_info(info, s); |
930ac04c | 1018 | populate_disk_info(info); |
3710586c | 1019 | populate_vfio_info(info); |
17549e84 | 1020 | break; |
0b827d5e HZ |
1021 | case MIGRATION_STATUS_COLO: |
1022 | info->has_status = true; | |
1023 | /* TODO: display COLO specific information (checkpoint info etc.) */ | |
1024 | break; | |
31194731 | 1025 | case MIGRATION_STATUS_COMPLETED: |
640dfb14 | 1026 | populate_time_info(info, s); |
a22463a5 | 1027 | populate_ram_info(info, s); |
3710586c | 1028 | populate_vfio_info(info); |
17549e84 | 1029 | break; |
31194731 | 1030 | case MIGRATION_STATUS_FAILED: |
791e7c82 | 1031 | info->has_status = true; |
d59ce6f3 | 1032 | if (s->error) { |
d59ce6f3 DB |
1033 | info->error_desc = g_strdup(error_get_pretty(s->error)); |
1034 | } | |
17549e84 | 1035 | break; |
31194731 | 1036 | case MIGRATION_STATUS_CANCELLED: |
791e7c82 | 1037 | info->has_status = true; |
17549e84 | 1038 | break; |
c7e0acd5 JF |
1039 | case MIGRATION_STATUS_WAIT_UNPLUG: |
1040 | info->has_status = true; | |
1041 | break; | |
5bb7910a | 1042 | } |
552de79b | 1043 | info->status = state; |
5bb7910a AL |
1044 | } |
1045 | ||
65ace060 AP |
1046 | static void fill_destination_migration_info(MigrationInfo *info) |
1047 | { | |
1048 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
1049 | ||
9aca82ba JQ |
1050 | if (mis->socket_address_list) { |
1051 | info->has_socket_address = true; | |
1052 | info->socket_address = | |
1053 | QAPI_CLONE(SocketAddressList, mis->socket_address_list); | |
1054 | } | |
1055 | ||
65ace060 AP |
1056 | switch (mis->state) { |
1057 | case MIGRATION_STATUS_NONE: | |
1058 | return; | |
65ace060 AP |
1059 | case MIGRATION_STATUS_SETUP: |
1060 | case MIGRATION_STATUS_CANCELLING: | |
1061 | case MIGRATION_STATUS_CANCELLED: | |
1062 | case MIGRATION_STATUS_ACTIVE: | |
1063 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
3c9928d9 PX |
1064 | case MIGRATION_STATUS_POSTCOPY_PAUSED: |
1065 | case MIGRATION_STATUS_POSTCOPY_RECOVER: | |
65ace060 AP |
1066 | case MIGRATION_STATUS_FAILED: |
1067 | case MIGRATION_STATUS_COLO: | |
1068 | info->has_status = true; | |
1069 | break; | |
1070 | case MIGRATION_STATUS_COMPLETED: | |
1071 | info->has_status = true; | |
1072 | fill_destination_postcopy_migration_info(info); | |
1073 | break; | |
1074 | } | |
1075 | info->status = mis->state; | |
1076 | } | |
1077 | ||
1078 | MigrationInfo *qmp_query_migrate(Error **errp) | |
1079 | { | |
1080 | MigrationInfo *info = g_malloc0(sizeof(*info)); | |
1081 | ||
1082 | fill_destination_migration_info(info); | |
1083 | fill_source_migration_info(info); | |
1084 | ||
1085 | return info; | |
1086 | } | |
1087 | ||
4886a1bc DDAG |
1088 | void qmp_migrate_start_postcopy(Error **errp) |
1089 | { | |
1090 | MigrationState *s = migrate_get_current(); | |
1091 | ||
16b0fd32 | 1092 | if (!migrate_postcopy()) { |
a54d340b | 1093 | error_setg(errp, "Enable postcopy with migrate_set_capability before" |
4886a1bc DDAG |
1094 | " the start of migration"); |
1095 | return; | |
1096 | } | |
1097 | ||
1098 | if (s->state == MIGRATION_STATUS_NONE) { | |
1099 | error_setg(errp, "Postcopy must be started after migration has been" | |
1100 | " started"); | |
1101 | return; | |
1102 | } | |
1103 | /* | |
1104 | * we don't error if migration has finished since that would be racy | |
1105 | * with issuing this command. | |
1106 | */ | |
d73415a3 | 1107 | qatomic_set(&s->start_postcopy, true); |
4886a1bc DDAG |
1108 | } |
1109 | ||
065e2813 AL |
1110 | /* shared migration helpers */ |
1111 | ||
48781e5b | 1112 | void migrate_set_state(int *state, int old_state, int new_state) |
51cf4c1a | 1113 | { |
a31fedee | 1114 | assert(new_state < MIGRATION_STATUS__MAX); |
d73415a3 | 1115 | if (qatomic_cmpxchg(state, old_state, new_state) == old_state) { |
a31fedee | 1116 | trace_migrate_set_state(MigrationStatus_str(new_state)); |
b05dc723 | 1117 | migrate_generate_event(new_state); |
51cf4c1a Z |
1118 | } |
1119 | } | |
1120 | ||
fd392cfa | 1121 | static void migrate_fd_cleanup(MigrationState *s) |
065e2813 | 1122 | { |
bb1fadc4 PB |
1123 | qemu_bh_delete(s->cleanup_bh); |
1124 | s->cleanup_bh = NULL; | |
1125 | ||
83174765 PX |
1126 | g_free(s->hostname); |
1127 | s->hostname = NULL; | |
e3bf5e68 DH |
1128 | json_writer_free(s->vmdesc); |
1129 | s->vmdesc = NULL; | |
83174765 | 1130 | |
0ceccd85 PX |
1131 | qemu_savevm_state_cleanup(); |
1132 | ||
89a02a9f | 1133 | if (s->to_dst_file) { |
62df066f | 1134 | QEMUFile *tmp; |
f986c3d2 | 1135 | |
9013dca5 | 1136 | trace_migrate_fd_cleanup(); |
404a7c05 | 1137 | qemu_mutex_unlock_iothread(); |
1d34e4bf DDAG |
1138 | if (s->migration_thread_running) { |
1139 | qemu_thread_join(&s->thread); | |
1140 | s->migration_thread_running = false; | |
1141 | } | |
404a7c05 PB |
1142 | qemu_mutex_lock_iothread(); |
1143 | ||
1398b2e3 | 1144 | multifd_save_cleanup(); |
62df066f PX |
1145 | qemu_mutex_lock(&s->qemu_file_lock); |
1146 | tmp = s->to_dst_file; | |
89a02a9f | 1147 | s->to_dst_file = NULL; |
62df066f PX |
1148 | qemu_mutex_unlock(&s->qemu_file_lock); |
1149 | /* | |
1150 | * Close the file handle without the lock to make sure the | |
1151 | * critical section won't block for long. | |
1152 | */ | |
39675fff | 1153 | migration_ioc_unregister_yank_from_file(tmp); |
62df066f | 1154 | qemu_fclose(tmp); |
065e2813 AL |
1155 | } |
1156 | ||
36f62f11 PX |
1157 | if (s->postcopy_qemufile_src) { |
1158 | migration_ioc_unregister_yank_from_file(s->postcopy_qemufile_src); | |
1159 | qemu_fclose(s->postcopy_qemufile_src); | |
1160 | s->postcopy_qemufile_src = NULL; | |
1161 | } | |
1162 | ||
8f8d528e | 1163 | assert(!migration_is_active(s)); |
7a2c1721 | 1164 | |
94f5a437 | 1165 | if (s->state == MIGRATION_STATUS_CANCELLING) { |
48781e5b | 1166 | migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING, |
94f5a437 | 1167 | MIGRATION_STATUS_CANCELLED); |
7a2c1721 | 1168 | } |
a3fa1d78 | 1169 | |
87db1a7d JQ |
1170 | if (s->error) { |
1171 | /* It is used on info migrate. We can't free it */ | |
1172 | error_report_err(error_copy(s->error)); | |
1173 | } | |
a3fa1d78 | 1174 | notifier_list_notify(&migration_state_notifiers, s); |
b1a87956 | 1175 | block_cleanup_parameters(); |
b5eea99e | 1176 | yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
065e2813 AL |
1177 | } |
1178 | ||
fd392cfa YK |
1179 | static void migrate_fd_cleanup_schedule(MigrationState *s) |
1180 | { | |
1181 | /* | |
1182 | * Ref the state for bh, because it may be called when | |
1183 | * there're already no other refs | |
1184 | */ | |
1185 | object_ref(OBJECT(s)); | |
1186 | qemu_bh_schedule(s->cleanup_bh); | |
1187 | } | |
1188 | ||
1189 | static void migrate_fd_cleanup_bh(void *opaque) | |
1190 | { | |
1191 | MigrationState *s = opaque; | |
1192 | migrate_fd_cleanup(s); | |
1193 | object_unref(OBJECT(s)); | |
1194 | } | |
1195 | ||
87db1a7d JQ |
1196 | void migrate_set_error(MigrationState *s, const Error *error) |
1197 | { | |
6e8a355d | 1198 | QEMU_LOCK_GUARD(&s->error_mutex); |
87db1a7d JQ |
1199 | if (!s->error) { |
1200 | s->error = error_copy(error); | |
1201 | } | |
87db1a7d JQ |
1202 | } |
1203 | ||
ca7bd082 PX |
1204 | static void migrate_error_free(MigrationState *s) |
1205 | { | |
1206 | QEMU_LOCK_GUARD(&s->error_mutex); | |
1207 | if (s->error) { | |
1208 | error_free(s->error); | |
1209 | s->error = NULL; | |
1210 | } | |
1211 | } | |
1212 | ||
d59ce6f3 | 1213 | void migrate_fd_error(MigrationState *s, const Error *error) |
065e2813 | 1214 | { |
25174055 | 1215 | trace_migrate_fd_error(error_get_pretty(error)); |
89a02a9f | 1216 | assert(s->to_dst_file == NULL); |
48781e5b HZ |
1217 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1218 | MIGRATION_STATUS_FAILED); | |
87db1a7d | 1219 | migrate_set_error(s, error); |
458cf28e JQ |
1220 | } |
1221 | ||
0edda1c4 | 1222 | static void migrate_fd_cancel(MigrationState *s) |
065e2813 | 1223 | { |
6f2b811a | 1224 | int old_state ; |
89a02a9f | 1225 | QEMUFile *f = migrate_get_current()->to_dst_file; |
9013dca5 | 1226 | trace_migrate_fd_cancel(); |
065e2813 | 1227 | |
43044ac0 PX |
1228 | WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) { |
1229 | if (s->rp_state.from_dst_file) { | |
1230 | /* shutdown the rp socket, so causing the rp thread to shutdown */ | |
1231 | qemu_file_shutdown(s->rp_state.from_dst_file); | |
1232 | } | |
70b20477 DDAG |
1233 | } |
1234 | ||
6f2b811a Z |
1235 | do { |
1236 | old_state = s->state; | |
392d87e2 | 1237 | if (!migration_is_running(old_state)) { |
6f2b811a Z |
1238 | break; |
1239 | } | |
a7b36b48 DDAG |
1240 | /* If the migration is paused, kick it out of the pause */ |
1241 | if (old_state == MIGRATION_STATUS_PRE_SWITCHOVER) { | |
1242 | qemu_sem_post(&s->pause_sem); | |
1243 | } | |
48781e5b | 1244 | migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING); |
31194731 | 1245 | } while (s->state != MIGRATION_STATUS_CANCELLING); |
a26ba26e DDAG |
1246 | |
1247 | /* | |
1248 | * If we're unlucky the migration code might be stuck somewhere in a | |
1249 | * send/write while the network has failed and is waiting to timeout; | |
1250 | * if we've got shutdown(2) available then we can force it to quit. | |
1251 | * The outgoing qemu file gets closed in migrate_fd_cleanup that is | |
1252 | * called in a bh, so there is no race against this cancel. | |
1253 | */ | |
31194731 | 1254 | if (s->state == MIGRATION_STATUS_CANCELLING && f) { |
a26ba26e DDAG |
1255 | qemu_file_shutdown(f); |
1256 | } | |
1d2acc31 HZ |
1257 | if (s->state == MIGRATION_STATUS_CANCELLING && s->block_inactive) { |
1258 | Error *local_err = NULL; | |
1259 | ||
3b717194 | 1260 | bdrv_activate_all(&local_err); |
1d2acc31 HZ |
1261 | if (local_err) { |
1262 | error_report_err(local_err); | |
1263 | } else { | |
1264 | s->block_inactive = false; | |
1265 | } | |
1266 | } | |
065e2813 AL |
1267 | } |
1268 | ||
99a0db9b GH |
1269 | void add_migration_state_change_notifier(Notifier *notify) |
1270 | { | |
1271 | notifier_list_add(&migration_state_notifiers, notify); | |
1272 | } | |
1273 | ||
1274 | void remove_migration_state_change_notifier(Notifier *notify) | |
1275 | { | |
31552529 | 1276 | notifier_remove(notify); |
99a0db9b GH |
1277 | } |
1278 | ||
02edd2e7 | 1279 | bool migration_in_setup(MigrationState *s) |
afe2df69 | 1280 | { |
31194731 | 1281 | return s->state == MIGRATION_STATUS_SETUP; |
afe2df69 GH |
1282 | } |
1283 | ||
7073693b | 1284 | bool migration_has_finished(MigrationState *s) |
99a0db9b | 1285 | { |
31194731 | 1286 | return s->state == MIGRATION_STATUS_COMPLETED; |
99a0db9b | 1287 | } |
0edda1c4 | 1288 | |
afe2df69 GH |
1289 | bool migration_has_failed(MigrationState *s) |
1290 | { | |
31194731 HZ |
1291 | return (s->state == MIGRATION_STATUS_CANCELLED || |
1292 | s->state == MIGRATION_STATUS_FAILED); | |
afe2df69 GH |
1293 | } |
1294 | ||
5727309d | 1295 | bool migration_in_postcopy(void) |
9ec055ae | 1296 | { |
5727309d JQ |
1297 | MigrationState *s = migrate_get_current(); |
1298 | ||
3748fef9 DDAG |
1299 | switch (s->state) { |
1300 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
1301 | case MIGRATION_STATUS_POSTCOPY_PAUSED: | |
1302 | case MIGRATION_STATUS_POSTCOPY_RECOVER: | |
1303 | return true; | |
1304 | default: | |
1305 | return false; | |
1306 | } | |
9ec055ae DDAG |
1307 | } |
1308 | ||
b82fc321 DDAG |
1309 | bool migration_in_postcopy_after_devices(MigrationState *s) |
1310 | { | |
5727309d | 1311 | return migration_in_postcopy() && s->postcopy_after_devices; |
b82fc321 DDAG |
1312 | } |
1313 | ||
06df2e69 DH |
1314 | bool migration_in_incoming_postcopy(void) |
1315 | { | |
1316 | PostcopyState ps = postcopy_state_get(); | |
1317 | ||
1318 | return ps >= POSTCOPY_INCOMING_DISCARD && ps < POSTCOPY_INCOMING_END; | |
1319 | } | |
1320 | ||
80fe315c DH |
1321 | bool migration_incoming_postcopy_advised(void) |
1322 | { | |
1323 | PostcopyState ps = postcopy_state_get(); | |
1324 | ||
1325 | return ps >= POSTCOPY_INCOMING_ADVISE && ps < POSTCOPY_INCOMING_END; | |
1326 | } | |
1327 | ||
1a8e44a8 AG |
1328 | bool migration_in_bg_snapshot(void) |
1329 | { | |
1330 | MigrationState *s = migrate_get_current(); | |
1331 | ||
1332 | return migrate_background_snapshot() && | |
1333 | migration_is_setup_or_active(s->state); | |
1334 | } | |
1335 | ||
fab35005 | 1336 | bool migration_is_idle(void) |
fe44dc91 | 1337 | { |
daff7f0b MA |
1338 | MigrationState *s = current_migration; |
1339 | ||
1340 | if (!s) { | |
1341 | return true; | |
1342 | } | |
fe44dc91 AA |
1343 | |
1344 | switch (s->state) { | |
1345 | case MIGRATION_STATUS_NONE: | |
1346 | case MIGRATION_STATUS_CANCELLED: | |
1347 | case MIGRATION_STATUS_COMPLETED: | |
1348 | case MIGRATION_STATUS_FAILED: | |
1349 | return true; | |
1350 | case MIGRATION_STATUS_SETUP: | |
1351 | case MIGRATION_STATUS_CANCELLING: | |
1352 | case MIGRATION_STATUS_ACTIVE: | |
1353 | case MIGRATION_STATUS_POSTCOPY_ACTIVE: | |
1354 | case MIGRATION_STATUS_COLO: | |
31e06077 DDAG |
1355 | case MIGRATION_STATUS_PRE_SWITCHOVER: |
1356 | case MIGRATION_STATUS_DEVICE: | |
c7e0acd5 | 1357 | case MIGRATION_STATUS_WAIT_UNPLUG: |
fe44dc91 AA |
1358 | return false; |
1359 | case MIGRATION_STATUS__MAX: | |
1360 | g_assert_not_reached(); | |
1361 | } | |
1362 | ||
1363 | return false; | |
1364 | } | |
1365 | ||
8f8d528e WY |
1366 | bool migration_is_active(MigrationState *s) |
1367 | { | |
1368 | return (s->state == MIGRATION_STATUS_ACTIVE || | |
1369 | s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
1370 | } | |
1371 | ||
3e0c8050 | 1372 | void migrate_init(MigrationState *s) |
0edda1c4 | 1373 | { |
389775d1 DDAG |
1374 | /* |
1375 | * Reinitialise all migration state, except | |
1376 | * parameters/capabilities that the user set, and | |
1377 | * locks. | |
1378 | */ | |
389775d1 | 1379 | s->cleanup_bh = 0; |
8518278a | 1380 | s->vm_start_bh = 0; |
89a02a9f | 1381 | s->to_dst_file = NULL; |
389775d1 | 1382 | s->state = MIGRATION_STATUS_NONE; |
389775d1 DDAG |
1383 | s->rp_state.from_dst_file = NULL; |
1384 | s->rp_state.error = false; | |
1385 | s->mbps = 0.0; | |
aecbfe9c | 1386 | s->pages_per_second = 0.0; |
389775d1 DDAG |
1387 | s->downtime = 0; |
1388 | s->expected_downtime = 0; | |
389775d1 | 1389 | s->setup_time = 0; |
389775d1 | 1390 | s->start_postcopy = false; |
b82fc321 | 1391 | s->postcopy_after_devices = false; |
389775d1 | 1392 | s->migration_thread_running = false; |
d59ce6f3 DB |
1393 | error_free(s->error); |
1394 | s->error = NULL; | |
d8053e73 | 1395 | s->hostname = NULL; |
389775d1 | 1396 | |
48781e5b | 1397 | migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); |
0edda1c4 | 1398 | |
4af246a3 PX |
1399 | s->start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
1400 | s->total_time = 0; | |
7287cbd4 | 1401 | s->vm_was_running = false; |
b15df1ae PX |
1402 | s->iteration_initial_bytes = 0; |
1403 | s->threshold_size = 0; | |
0edda1c4 | 1404 | } |
cab30143 | 1405 | |
60fd6801 | 1406 | int migrate_add_blocker_internal(Error *reason, Error **errp) |
fa2756b7 | 1407 | { |
4c170330 PX |
1408 | /* Snapshots are similar to migrations, so check RUN_STATE_SAVE_VM too. */ |
1409 | if (runstate_check(RUN_STATE_SAVE_VM) || !migration_is_idle()) { | |
1410 | error_propagate_prepend(errp, error_copy(reason), | |
1411 | "disallowing migration blocker " | |
1412 | "(migration/snapshot in progress) for: "); | |
1413 | return -EBUSY; | |
fe44dc91 AA |
1414 | } |
1415 | ||
4c170330 PX |
1416 | migration_blockers = g_slist_prepend(migration_blockers, reason); |
1417 | return 0; | |
fa2756b7 AL |
1418 | } |
1419 | ||
60fd6801 PX |
1420 | int migrate_add_blocker(Error *reason, Error **errp) |
1421 | { | |
1422 | if (only_migratable) { | |
1423 | error_propagate_prepend(errp, error_copy(reason), | |
1424 | "disallowing migration blocker " | |
1425 | "(--only-migratable) for: "); | |
1426 | return -EACCES; | |
1427 | } | |
1428 | ||
1429 | return migrate_add_blocker_internal(reason, errp); | |
1430 | } | |
1431 | ||
fa2756b7 AL |
1432 | void migrate_del_blocker(Error *reason) |
1433 | { | |
1434 | migration_blockers = g_slist_remove(migration_blockers, reason); | |
1435 | } | |
1436 | ||
bf1ae1f4 DDAG |
1437 | void qmp_migrate_incoming(const char *uri, Error **errp) |
1438 | { | |
1439 | Error *local_err = NULL; | |
4debb5f5 | 1440 | static bool once = true; |
bf1ae1f4 | 1441 | |
4debb5f5 DDAG |
1442 | if (!once) { |
1443 | error_setg(errp, "The incoming migration has already been started"); | |
603d5a42 | 1444 | return; |
4debb5f5 | 1445 | } |
e69d50d6 PB |
1446 | if (!runstate_check(RUN_STATE_INMIGRATE)) { |
1447 | error_setg(errp, "'-incoming' was not specified on the command line"); | |
1448 | return; | |
1449 | } | |
bf1ae1f4 | 1450 | |
cc48c587 PX |
1451 | if (!yank_register_instance(MIGRATION_YANK_INSTANCE, errp)) { |
1452 | return; | |
1453 | } | |
1454 | ||
bf1ae1f4 DDAG |
1455 | qemu_start_incoming_migration(uri, &local_err); |
1456 | ||
1457 | if (local_err) { | |
cc48c587 | 1458 | yank_unregister_instance(MIGRATION_YANK_INSTANCE); |
bf1ae1f4 DDAG |
1459 | error_propagate(errp, local_err); |
1460 | return; | |
1461 | } | |
1462 | ||
4debb5f5 | 1463 | once = false; |
bf1ae1f4 DDAG |
1464 | } |
1465 | ||
02affd41 PX |
1466 | void qmp_migrate_recover(const char *uri, Error **errp) |
1467 | { | |
1468 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
1469 | ||
b7f9afd4 PX |
1470 | /* |
1471 | * Don't even bother to use ERRP_GUARD() as it _must_ always be set by | |
1472 | * callers (no one should ignore a recover failure); if there is, it's a | |
1473 | * programming error. | |
1474 | */ | |
1475 | assert(errp); | |
1476 | ||
02affd41 PX |
1477 | if (mis->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { |
1478 | error_setg(errp, "Migrate recover can only be run " | |
1479 | "when postcopy is paused."); | |
1480 | return; | |
1481 | } | |
1482 | ||
08401c04 PX |
1483 | /* If there's an existing transport, release it */ |
1484 | migration_incoming_transport_cleanup(mis); | |
02affd41 PX |
1485 | |
1486 | /* | |
1487 | * Note that this call will never start a real migration; it will | |
1488 | * only re-setup the migration stream and poke existing migration | |
1489 | * to continue using that newly established channel. | |
1490 | */ | |
1491 | qemu_start_incoming_migration(uri, errp); | |
1492 | } | |
1493 | ||
bfbf89c2 PX |
1494 | void qmp_migrate_pause(Error **errp) |
1495 | { | |
1496 | MigrationState *ms = migrate_get_current(); | |
1497 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
1498 | int ret; | |
1499 | ||
1500 | if (ms->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1501 | /* Source side, during postcopy */ | |
1502 | qemu_mutex_lock(&ms->qemu_file_lock); | |
1503 | ret = qemu_file_shutdown(ms->to_dst_file); | |
1504 | qemu_mutex_unlock(&ms->qemu_file_lock); | |
1505 | if (ret) { | |
1506 | error_setg(errp, "Failed to pause source migration"); | |
1507 | } | |
1508 | return; | |
1509 | } | |
1510 | ||
1511 | if (mis->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
1512 | ret = qemu_file_shutdown(mis->from_src_file); | |
1513 | if (ret) { | |
1514 | error_setg(errp, "Failed to pause destination migration"); | |
1515 | } | |
1516 | return; | |
1517 | } | |
1518 | ||
1519 | error_setg(errp, "migrate-pause is currently only supported " | |
1520 | "during postcopy-active state"); | |
1521 | } | |
1522 | ||
24f3902b GK |
1523 | bool migration_is_blocked(Error **errp) |
1524 | { | |
1525 | if (qemu_savevm_state_blocked(errp)) { | |
1526 | return true; | |
1527 | } | |
1528 | ||
1529 | if (migration_blockers) { | |
250561e1 | 1530 | error_propagate(errp, error_copy(migration_blockers->data)); |
24f3902b GK |
1531 | return true; |
1532 | } | |
1533 | ||
1534 | return false; | |
1535 | } | |
1536 | ||
d3e35b8f PX |
1537 | /* Returns true if continue to migrate, or false if error detected */ |
1538 | static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc, | |
1539 | bool resume, Error **errp) | |
cab30143 | 1540 | { |
be7059cd | 1541 | Error *local_err = NULL; |
d3e35b8f PX |
1542 | |
1543 | if (resume) { | |
1544 | if (s->state != MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
1545 | error_setg(errp, "Cannot resume if there is no " | |
1546 | "paused migration"); | |
1547 | return false; | |
1548 | } | |
97ca211c PX |
1549 | |
1550 | /* | |
1551 | * Postcopy recovery won't work well with release-ram | |
1552 | * capability since release-ram will drop the page buffer as | |
1553 | * long as the page is put into the send buffer. So if there | |
1554 | * is a network failure happened, any page buffers that have | |
1555 | * not yet reached the destination VM but have already been | |
1556 | * sent from the source VM will be lost forever. Let's refuse | |
1557 | * the client from resuming such a postcopy migration. | |
1558 | * Luckily release-ram was designed to only be used when src | |
1559 | * and destination VMs are on the same host, so it should be | |
1560 | * fine. | |
1561 | */ | |
1562 | if (migrate_release_ram()) { | |
1563 | error_setg(errp, "Postcopy recovery cannot work " | |
1564 | "when release-ram capability is set"); | |
1565 | return false; | |
1566 | } | |
1567 | ||
d3e35b8f PX |
1568 | /* This is a resume, skip init status */ |
1569 | return true; | |
1570 | } | |
cab30143 | 1571 | |
392d87e2 | 1572 | if (migration_is_running(s->state)) { |
c6bd8c70 | 1573 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
d3e35b8f | 1574 | return false; |
cab30143 | 1575 | } |
d3e35b8f | 1576 | |
ca99993a DDAG |
1577 | if (runstate_check(RUN_STATE_INMIGRATE)) { |
1578 | error_setg(errp, "Guest is waiting for an incoming migration"); | |
d3e35b8f | 1579 | return false; |
ca99993a DDAG |
1580 | } |
1581 | ||
36d0fe65 T |
1582 | if (runstate_check(RUN_STATE_POSTMIGRATE)) { |
1583 | error_setg(errp, "Can't migrate the vm that was paused due to " | |
1584 | "previous migration"); | |
1585 | return false; | |
1586 | } | |
1587 | ||
24f3902b | 1588 | if (migration_is_blocked(errp)) { |
d3e35b8f | 1589 | return false; |
fa2756b7 AL |
1590 | } |
1591 | ||
d3e35b8f | 1592 | if (blk || blk_inc) { |
5e804644 | 1593 | if (migrate_colo()) { |
3ba02445 RL |
1594 | error_setg(errp, "No disk migration is required in COLO mode"); |
1595 | return false; | |
1596 | } | |
6f8be708 | 1597 | if (migrate_block() || migrate_block_incremental()) { |
2833c59b JQ |
1598 | error_setg(errp, "Command options are incompatible with " |
1599 | "current migration capabilities"); | |
d3e35b8f | 1600 | return false; |
2833c59b | 1601 | } |
9eb1109c | 1602 | if (!migrate_cap_set(MIGRATION_CAPABILITY_BLOCK, true, &local_err)) { |
2833c59b | 1603 | error_propagate(errp, local_err); |
d3e35b8f | 1604 | return false; |
2833c59b JQ |
1605 | } |
1606 | s->must_remove_block_options = true; | |
1607 | } | |
1608 | ||
d3e35b8f | 1609 | if (blk_inc) { |
87c22901 | 1610 | migrate_set_block_incremental(true); |
2833c59b JQ |
1611 | } |
1612 | ||
3e0c8050 | 1613 | migrate_init(s); |
87f3bd87 | 1614 | /* |
fa0b31d5 | 1615 | * set ram_counters compression_counters memory to zero for a |
87f3bd87 IR |
1616 | * new migration |
1617 | */ | |
1618 | memset(&ram_counters, 0, sizeof(ram_counters)); | |
fa0b31d5 | 1619 | memset(&compression_counters, 0, sizeof(compression_counters)); |
cab30143 | 1620 | |
d3e35b8f PX |
1621 | return true; |
1622 | } | |
1623 | ||
1624 | void qmp_migrate(const char *uri, bool has_blk, bool blk, | |
1625 | bool has_inc, bool inc, bool has_detach, bool detach, | |
1626 | bool has_resume, bool resume, Error **errp) | |
1627 | { | |
1628 | Error *local_err = NULL; | |
1629 | MigrationState *s = migrate_get_current(); | |
d658f65c | 1630 | const char *p = NULL; |
d3e35b8f | 1631 | |
d6f74fd1 PX |
1632 | /* URI is not suitable for migration? */ |
1633 | if (!migration_channels_and_uri_compatible(uri, errp)) { | |
1634 | return; | |
1635 | } | |
1636 | ||
d3e35b8f PX |
1637 | if (!migrate_prepare(s, has_blk && blk, has_inc && inc, |
1638 | has_resume && resume, errp)) { | |
1639 | /* Error detected, put into errp */ | |
1640 | return; | |
1641 | } | |
1642 | ||
b5eea99e LS |
1643 | if (!(has_resume && resume)) { |
1644 | if (!yank_register_instance(MIGRATION_YANK_INSTANCE, errp)) { | |
1645 | return; | |
1646 | } | |
1647 | } | |
1648 | ||
d658f65c | 1649 | if (strstart(uri, "tcp:", &p) || |
9ba3b2ba LM |
1650 | strstart(uri, "unix:", NULL) || |
1651 | strstart(uri, "vsock:", NULL)) { | |
d658f65c | 1652 | socket_start_outgoing_migration(s, p ? p : uri, &local_err); |
2da776db | 1653 | #ifdef CONFIG_RDMA |
41310c68 | 1654 | } else if (strstart(uri, "rdma:", &p)) { |
2da776db MH |
1655 | rdma_start_outgoing_migration(s, p, &local_err); |
1656 | #endif | |
cab30143 | 1657 | } else if (strstart(uri, "exec:", &p)) { |
f37afb5a | 1658 | exec_start_outgoing_migration(s, p, &local_err); |
cab30143 | 1659 | } else if (strstart(uri, "fd:", &p)) { |
f37afb5a | 1660 | fd_start_outgoing_migration(s, p, &local_err); |
99a0db9b | 1661 | } else { |
b5eea99e LS |
1662 | if (!(has_resume && resume)) { |
1663 | yank_unregister_instance(MIGRATION_YANK_INSTANCE); | |
1664 | } | |
c6bd8c70 MA |
1665 | error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri", |
1666 | "a valid migration protocol"); | |
48781e5b HZ |
1667 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
1668 | MIGRATION_STATUS_FAILED); | |
b1a87956 | 1669 | block_cleanup_parameters(); |
e1c37d0e | 1670 | return; |
cab30143 JQ |
1671 | } |
1672 | ||
f37afb5a | 1673 | if (local_err) { |
b5eea99e LS |
1674 | if (!(has_resume && resume)) { |
1675 | yank_unregister_instance(MIGRATION_YANK_INSTANCE); | |
1676 | } | |
d59ce6f3 | 1677 | migrate_fd_error(s, local_err); |
f37afb5a | 1678 | error_propagate(errp, local_err); |
e1c37d0e | 1679 | return; |
1299c631 | 1680 | } |
cab30143 JQ |
1681 | } |
1682 | ||
6cdedb07 | 1683 | void qmp_migrate_cancel(Error **errp) |
cab30143 | 1684 | { |
458fecca | 1685 | migration_cancel(NULL); |
cab30143 JQ |
1686 | } |
1687 | ||
89cfc02c DDAG |
1688 | void qmp_migrate_continue(MigrationStatus state, Error **errp) |
1689 | { | |
1690 | MigrationState *s = migrate_get_current(); | |
1691 | if (s->state != state) { | |
1692 | error_setg(errp, "Migration not in expected state: %s", | |
1693 | MigrationStatus_str(s->state)); | |
1694 | return; | |
1695 | } | |
1696 | qemu_sem_post(&s->pause_sem); | |
1697 | } | |
1698 | ||
70b20477 DDAG |
1699 | /* migration thread support */ |
1700 | /* | |
1701 | * Something bad happened to the RP stream, mark an error | |
1702 | * The caller shall print or trace something to indicate why | |
1703 | */ | |
1704 | static void mark_source_rp_bad(MigrationState *s) | |
1705 | { | |
1706 | s->rp_state.error = true; | |
1707 | } | |
1708 | ||
1709 | static struct rp_cmd_args { | |
1710 | ssize_t len; /* -1 = variable */ | |
1711 | const char *name; | |
1712 | } rp_cmd_args[] = { | |
1713 | [MIG_RP_MSG_INVALID] = { .len = -1, .name = "INVALID" }, | |
1714 | [MIG_RP_MSG_SHUT] = { .len = 4, .name = "SHUT" }, | |
1715 | [MIG_RP_MSG_PONG] = { .len = 4, .name = "PONG" }, | |
1e2d90eb DDAG |
1716 | [MIG_RP_MSG_REQ_PAGES] = { .len = 12, .name = "REQ_PAGES" }, |
1717 | [MIG_RP_MSG_REQ_PAGES_ID] = { .len = -1, .name = "REQ_PAGES_ID" }, | |
a335debb | 1718 | [MIG_RP_MSG_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" }, |
13955b89 | 1719 | [MIG_RP_MSG_RESUME_ACK] = { .len = 4, .name = "RESUME_ACK" }, |
70b20477 DDAG |
1720 | [MIG_RP_MSG_MAX] = { .len = -1, .name = "MAX" }, |
1721 | }; | |
1722 | ||
1e2d90eb DDAG |
1723 | /* |
1724 | * Process a request for pages received on the return path, | |
1725 | * We're allowed to send more than requested (e.g. to round to our page size) | |
1726 | * and we don't need to send pages that have already been sent. | |
1727 | */ | |
1728 | static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname, | |
1729 | ram_addr_t start, size_t len) | |
1730 | { | |
8e3b0cbb | 1731 | long our_host_ps = qemu_real_host_page_size(); |
6c595cde | 1732 | |
1e2d90eb | 1733 | trace_migrate_handle_rp_req_pages(rbname, start, len); |
6c595cde DDAG |
1734 | |
1735 | /* | |
1736 | * Since we currently insist on matching page sizes, just sanity check | |
1737 | * we're being asked for whole host pages. | |
1738 | */ | |
7648297d DH |
1739 | if (!QEMU_IS_ALIGNED(start, our_host_ps) || |
1740 | !QEMU_IS_ALIGNED(len, our_host_ps)) { | |
6c595cde DDAG |
1741 | error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT |
1742 | " len: %zd", __func__, start, len); | |
1743 | mark_source_rp_bad(ms); | |
1744 | return; | |
1745 | } | |
1746 | ||
96506894 | 1747 | if (ram_save_queue_pages(rbname, start, len)) { |
6c595cde DDAG |
1748 | mark_source_rp_bad(ms); |
1749 | } | |
1e2d90eb DDAG |
1750 | } |
1751 | ||
14b1742e PX |
1752 | /* Return true to retry, false to quit */ |
1753 | static bool postcopy_pause_return_path_thread(MigrationState *s) | |
1754 | { | |
1755 | trace_postcopy_pause_return_path(); | |
1756 | ||
1757 | qemu_sem_wait(&s->postcopy_pause_rp_sem); | |
1758 | ||
1759 | trace_postcopy_pause_return_path_continued(); | |
1760 | ||
1761 | return true; | |
1762 | } | |
1763 | ||
a335debb PX |
1764 | static int migrate_handle_rp_recv_bitmap(MigrationState *s, char *block_name) |
1765 | { | |
1766 | RAMBlock *block = qemu_ram_block_by_name(block_name); | |
1767 | ||
1768 | if (!block) { | |
1769 | error_report("%s: invalid block name '%s'", __func__, block_name); | |
1770 | return -EINVAL; | |
1771 | } | |
1772 | ||
1773 | /* Fetch the received bitmap and refresh the dirty bitmap */ | |
1774 | return ram_dirty_bitmap_reload(s, block); | |
1775 | } | |
1776 | ||
13955b89 PX |
1777 | static int migrate_handle_rp_resume_ack(MigrationState *s, uint32_t value) |
1778 | { | |
1779 | trace_source_return_path_thread_resume_ack(value); | |
1780 | ||
1781 | if (value != MIGRATION_RESUME_ACK_VALUE) { | |
1782 | error_report("%s: illegal resume_ack value %"PRIu32, | |
1783 | __func__, value); | |
1784 | return -1; | |
1785 | } | |
1786 | ||
1787 | /* Now both sides are active. */ | |
1788 | migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_RECOVER, | |
1789 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
1790 | ||
94190696 PX |
1791 | /* Notify send thread that time to continue send pages */ |
1792 | qemu_sem_post(&s->rp_state.rp_sem); | |
13955b89 PX |
1793 | |
1794 | return 0; | |
1795 | } | |
1796 | ||
93589827 PX |
1797 | /* |
1798 | * Release ms->rp_state.from_dst_file (and postcopy_qemufile_src if | |
1799 | * existed) in a safe way. | |
1800 | */ | |
1801 | static void migration_release_dst_files(MigrationState *ms) | |
43044ac0 PX |
1802 | { |
1803 | QEMUFile *file; | |
1804 | ||
1805 | WITH_QEMU_LOCK_GUARD(&ms->qemu_file_lock) { | |
1806 | /* | |
1807 | * Reset the from_dst_file pointer first before releasing it, as we | |
1808 | * can't block within lock section | |
1809 | */ | |
1810 | file = ms->rp_state.from_dst_file; | |
1811 | ms->rp_state.from_dst_file = NULL; | |
1812 | } | |
1813 | ||
93589827 PX |
1814 | /* |
1815 | * Do the same to postcopy fast path socket too if there is. No | |
1816 | * locking needed because this qemufile should only be managed by | |
1817 | * return path thread. | |
1818 | */ | |
1819 | if (ms->postcopy_qemufile_src) { | |
1820 | migration_ioc_unregister_yank_from_file(ms->postcopy_qemufile_src); | |
1821 | qemu_file_shutdown(ms->postcopy_qemufile_src); | |
1822 | qemu_fclose(ms->postcopy_qemufile_src); | |
1823 | ms->postcopy_qemufile_src = NULL; | |
1824 | } | |
1825 | ||
43044ac0 PX |
1826 | qemu_fclose(file); |
1827 | } | |
1828 | ||
70b20477 DDAG |
1829 | /* |
1830 | * Handles messages sent on the return path towards the source VM | |
1831 | * | |
1832 | */ | |
1833 | static void *source_return_path_thread(void *opaque) | |
1834 | { | |
1835 | MigrationState *ms = opaque; | |
1836 | QEMUFile *rp = ms->rp_state.from_dst_file; | |
1837 | uint16_t header_len, header_type; | |
568b01ca | 1838 | uint8_t buf[512]; |
70b20477 | 1839 | uint32_t tmp32, sibling_error; |
1e2d90eb DDAG |
1840 | ram_addr_t start = 0; /* =0 to silence warning */ |
1841 | size_t len = 0, expected_len; | |
70b20477 DDAG |
1842 | int res; |
1843 | ||
1844 | trace_source_return_path_thread_entry(); | |
74637e6f | 1845 | rcu_register_thread(); |
14b1742e PX |
1846 | |
1847 | retry: | |
70b20477 DDAG |
1848 | while (!ms->rp_state.error && !qemu_file_get_error(rp) && |
1849 | migration_is_setup_or_active(ms->state)) { | |
1850 | trace_source_return_path_thread_loop_top(); | |
1851 | header_type = qemu_get_be16(rp); | |
1852 | header_len = qemu_get_be16(rp); | |
1853 | ||
7a9ddfbf PX |
1854 | if (qemu_file_get_error(rp)) { |
1855 | mark_source_rp_bad(ms); | |
1856 | goto out; | |
1857 | } | |
1858 | ||
70b20477 DDAG |
1859 | if (header_type >= MIG_RP_MSG_MAX || |
1860 | header_type == MIG_RP_MSG_INVALID) { | |
1861 | error_report("RP: Received invalid message 0x%04x length 0x%04x", | |
ed8b2828 | 1862 | header_type, header_len); |
70b20477 DDAG |
1863 | mark_source_rp_bad(ms); |
1864 | goto out; | |
1865 | } | |
1866 | ||
1867 | if ((rp_cmd_args[header_type].len != -1 && | |
1868 | header_len != rp_cmd_args[header_type].len) || | |
568b01ca | 1869 | header_len > sizeof(buf)) { |
70b20477 | 1870 | error_report("RP: Received '%s' message (0x%04x) with" |
ed8b2828 MZ |
1871 | "incorrect length %d expecting %zu", |
1872 | rp_cmd_args[header_type].name, header_type, header_len, | |
1873 | (size_t)rp_cmd_args[header_type].len); | |
70b20477 DDAG |
1874 | mark_source_rp_bad(ms); |
1875 | goto out; | |
1876 | } | |
1877 | ||
1878 | /* We know we've got a valid header by this point */ | |
1879 | res = qemu_get_buffer(rp, buf, header_len); | |
1880 | if (res != header_len) { | |
1881 | error_report("RP: Failed reading data for message 0x%04x" | |
1882 | " read %d expected %d", | |
1883 | header_type, res, header_len); | |
1884 | mark_source_rp_bad(ms); | |
1885 | goto out; | |
1886 | } | |
1887 | ||
1888 | /* OK, we have the message and the data */ | |
1889 | switch (header_type) { | |
1890 | case MIG_RP_MSG_SHUT: | |
4d885131 | 1891 | sibling_error = ldl_be_p(buf); |
70b20477 DDAG |
1892 | trace_source_return_path_thread_shut(sibling_error); |
1893 | if (sibling_error) { | |
1894 | error_report("RP: Sibling indicated error %d", sibling_error); | |
1895 | mark_source_rp_bad(ms); | |
1896 | } | |
1897 | /* | |
1898 | * We'll let the main thread deal with closing the RP | |
1899 | * we could do a shutdown(2) on it, but we're the only user | |
1900 | * anyway, so there's nothing gained. | |
1901 | */ | |
1902 | goto out; | |
1903 | ||
1904 | case MIG_RP_MSG_PONG: | |
4d885131 | 1905 | tmp32 = ldl_be_p(buf); |
70b20477 | 1906 | trace_source_return_path_thread_pong(tmp32); |
b28fb582 | 1907 | qemu_sem_post(&ms->rp_state.rp_pong_acks); |
70b20477 DDAG |
1908 | break; |
1909 | ||
1e2d90eb | 1910 | case MIG_RP_MSG_REQ_PAGES: |
4d885131 PM |
1911 | start = ldq_be_p(buf); |
1912 | len = ldl_be_p(buf + 8); | |
1e2d90eb DDAG |
1913 | migrate_handle_rp_req_pages(ms, NULL, start, len); |
1914 | break; | |
1915 | ||
1916 | case MIG_RP_MSG_REQ_PAGES_ID: | |
1917 | expected_len = 12 + 1; /* header + termination */ | |
1918 | ||
1919 | if (header_len >= expected_len) { | |
4d885131 PM |
1920 | start = ldq_be_p(buf); |
1921 | len = ldl_be_p(buf + 8); | |
1e2d90eb DDAG |
1922 | /* Now we expect an idstr */ |
1923 | tmp32 = buf[12]; /* Length of the following idstr */ | |
1924 | buf[13 + tmp32] = '\0'; | |
1925 | expected_len += tmp32; | |
1926 | } | |
1927 | if (header_len != expected_len) { | |
1928 | error_report("RP: Req_Page_id with length %d expecting %zd", | |
ed8b2828 | 1929 | header_len, expected_len); |
1e2d90eb DDAG |
1930 | mark_source_rp_bad(ms); |
1931 | goto out; | |
1932 | } | |
1933 | migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len); | |
1934 | break; | |
1935 | ||
a335debb PX |
1936 | case MIG_RP_MSG_RECV_BITMAP: |
1937 | if (header_len < 1) { | |
1938 | error_report("%s: missing block name", __func__); | |
1939 | mark_source_rp_bad(ms); | |
1940 | goto out; | |
1941 | } | |
1942 | /* Format: len (1B) + idstr (<255B). This ends the idstr. */ | |
1943 | buf[buf[0] + 1] = '\0'; | |
1944 | if (migrate_handle_rp_recv_bitmap(ms, (char *)(buf + 1))) { | |
1945 | mark_source_rp_bad(ms); | |
1946 | goto out; | |
1947 | } | |
1948 | break; | |
1949 | ||
13955b89 PX |
1950 | case MIG_RP_MSG_RESUME_ACK: |
1951 | tmp32 = ldl_be_p(buf); | |
1952 | if (migrate_handle_rp_resume_ack(ms, tmp32)) { | |
1953 | mark_source_rp_bad(ms); | |
1954 | goto out; | |
1955 | } | |
1956 | break; | |
1957 | ||
70b20477 DDAG |
1958 | default: |
1959 | break; | |
1960 | } | |
1961 | } | |
14b1742e PX |
1962 | |
1963 | out: | |
1964 | res = qemu_file_get_error(rp); | |
1965 | if (res) { | |
d5c8f2af | 1966 | if (res && migration_in_postcopy()) { |
14b1742e PX |
1967 | /* |
1968 | * Maybe there is something we can do: it looks like a | |
1969 | * network down issue, and we pause for a recovery. | |
1970 | */ | |
93589827 | 1971 | migration_release_dst_files(ms); |
2e3e3da3 | 1972 | rp = NULL; |
14b1742e | 1973 | if (postcopy_pause_return_path_thread(ms)) { |
43044ac0 PX |
1974 | /* |
1975 | * Reload rp, reset the rest. Referencing it is safe since | |
1976 | * it's reset only by us above, or when migration completes | |
1977 | */ | |
2e3e3da3 | 1978 | rp = ms->rp_state.from_dst_file; |
14b1742e PX |
1979 | ms->rp_state.error = false; |
1980 | goto retry; | |
1981 | } | |
1982 | } | |
1983 | ||
70b20477 DDAG |
1984 | trace_source_return_path_thread_bad_end(); |
1985 | mark_source_rp_bad(ms); | |
1986 | } | |
1987 | ||
1988 | trace_source_return_path_thread_end(); | |
93589827 | 1989 | migration_release_dst_files(ms); |
74637e6f | 1990 | rcu_unregister_thread(); |
70b20477 DDAG |
1991 | return NULL; |
1992 | } | |
1993 | ||
d3e35b8f PX |
1994 | static int open_return_path_on_source(MigrationState *ms, |
1995 | bool create_thread) | |
70b20477 | 1996 | { |
89a02a9f | 1997 | ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file); |
70b20477 DDAG |
1998 | if (!ms->rp_state.from_dst_file) { |
1999 | return -1; | |
2000 | } | |
2001 | ||
2002 | trace_open_return_path_on_source(); | |
d3e35b8f PX |
2003 | |
2004 | if (!create_thread) { | |
2005 | /* We're done */ | |
2006 | return 0; | |
2007 | } | |
2008 | ||
70b20477 DDAG |
2009 | qemu_thread_create(&ms->rp_state.rp_thread, "return path", |
2010 | source_return_path_thread, ms, QEMU_THREAD_JOINABLE); | |
53021ea1 | 2011 | ms->rp_state.rp_thread_created = true; |
70b20477 DDAG |
2012 | |
2013 | trace_open_return_path_on_source_continue(); | |
2014 | ||
2015 | return 0; | |
2016 | } | |
2017 | ||
70b20477 DDAG |
2018 | /* Returns 0 if the RP was ok, otherwise there was an error on the RP */ |
2019 | static int await_return_path_close_on_source(MigrationState *ms) | |
2020 | { | |
2021 | /* | |
2022 | * If this is a normal exit then the destination will send a SHUT and the | |
2023 | * rp_thread will exit, however if there's an error we need to cause | |
2024 | * it to exit. | |
2025 | */ | |
89a02a9f | 2026 | if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) { |
70b20477 DDAG |
2027 | /* |
2028 | * shutdown(2), if we have it, will cause it to unblock if it's stuck | |
2029 | * waiting for the destination. | |
2030 | */ | |
2031 | qemu_file_shutdown(ms->rp_state.from_dst_file); | |
2032 | mark_source_rp_bad(ms); | |
2033 | } | |
2034 | trace_await_return_path_close_on_source_joining(); | |
2035 | qemu_thread_join(&ms->rp_state.rp_thread); | |
53021ea1 | 2036 | ms->rp_state.rp_thread_created = false; |
70b20477 DDAG |
2037 | trace_await_return_path_close_on_source_close(); |
2038 | return ms->rp_state.error; | |
2039 | } | |
2040 | ||
5655aab0 PX |
2041 | static inline void |
2042 | migration_wait_main_channel(MigrationState *ms) | |
2043 | { | |
2044 | /* Wait until one PONG message received */ | |
2045 | qemu_sem_wait(&ms->rp_state.rp_pong_acks); | |
2046 | } | |
2047 | ||
1d34e4bf DDAG |
2048 | /* |
2049 | * Switch from normal iteration to postcopy | |
2050 | * Returns non-0 on error | |
2051 | */ | |
7287cbd4 | 2052 | static int postcopy_start(MigrationState *ms) |
1d34e4bf DDAG |
2053 | { |
2054 | int ret; | |
61b67d47 DB |
2055 | QIOChannelBuffer *bioc; |
2056 | QEMUFile *fb; | |
1d34e4bf | 2057 | int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
7e555c6c | 2058 | int64_t bandwidth = migrate_max_postcopy_bandwidth(); |
ef8d6488 | 2059 | bool restart_block = false; |
0331c8ca | 2060 | int cur_state = MIGRATION_STATUS_ACTIVE; |
d0edb8a1 | 2061 | |
5655aab0 PX |
2062 | if (migrate_postcopy_preempt()) { |
2063 | migration_wait_main_channel(ms); | |
2064 | if (postcopy_preempt_establish_channel(ms)) { | |
2065 | migrate_set_state(&ms->state, ms->state, MIGRATION_STATUS_FAILED); | |
2066 | return -1; | |
2067 | } | |
d0edb8a1 PX |
2068 | } |
2069 | ||
0331c8ca DDAG |
2070 | if (!migrate_pause_before_switchover()) { |
2071 | migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE, | |
2072 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
2073 | } | |
1d34e4bf DDAG |
2074 | |
2075 | trace_postcopy_start(); | |
2076 | qemu_mutex_lock_iothread(); | |
2077 | trace_postcopy_start_set_run(); | |
2078 | ||
fb064112 | 2079 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); |
1d34e4bf DDAG |
2080 | global_state_store(); |
2081 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
76b1c7fe KW |
2082 | if (ret < 0) { |
2083 | goto fail; | |
2084 | } | |
1d34e4bf | 2085 | |
0331c8ca DDAG |
2086 | ret = migration_maybe_pause(ms, &cur_state, |
2087 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
2088 | if (ret < 0) { | |
2089 | goto fail; | |
2090 | } | |
2091 | ||
76b1c7fe | 2092 | ret = bdrv_inactivate_all(); |
1d34e4bf DDAG |
2093 | if (ret < 0) { |
2094 | goto fail; | |
2095 | } | |
ef8d6488 | 2096 | restart_block = true; |
1d34e4bf | 2097 | |
1c0d249d DDAG |
2098 | /* |
2099 | * Cause any non-postcopiable, but iterative devices to | |
2100 | * send out their final data. | |
2101 | */ | |
a1fbe750 | 2102 | qemu_savevm_state_complete_precopy(ms->to_dst_file, true, false); |
1c0d249d | 2103 | |
1d34e4bf DDAG |
2104 | /* |
2105 | * in Finish migrate and with the io-lock held everything should | |
2106 | * be quiet, but we've potentially still got dirty pages and we | |
2107 | * need to tell the destination to throw any pages it's already received | |
2108 | * that are dirty | |
2109 | */ | |
58110f0a | 2110 | if (migrate_postcopy_ram()) { |
739fcc1b | 2111 | ram_postcopy_send_discard_bitmap(ms); |
1d34e4bf DDAG |
2112 | } |
2113 | ||
2114 | /* | |
2115 | * send rest of state - note things that are doing postcopy | |
2116 | * will notice we're in POSTCOPY_ACTIVE and not actually | |
2117 | * wrap their state up here | |
2118 | */ | |
7e555c6c DDAG |
2119 | /* 0 max-postcopy-bandwidth means unlimited */ |
2120 | if (!bandwidth) { | |
2121 | qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX); | |
2122 | } else { | |
2123 | qemu_file_set_rate_limit(ms->to_dst_file, bandwidth / XFER_LIMIT_RATIO); | |
2124 | } | |
58110f0a VSO |
2125 | if (migrate_postcopy_ram()) { |
2126 | /* Ping just for debugging, helps line traces up */ | |
2127 | qemu_savevm_send_ping(ms->to_dst_file, 2); | |
2128 | } | |
1d34e4bf DDAG |
2129 | |
2130 | /* | |
2131 | * While loading the device state we may trigger page transfer | |
2132 | * requests and the fd must be free to process those, and thus | |
2133 | * the destination must read the whole device state off the fd before | |
2134 | * it starts processing it. Unfortunately the ad-hoc migration format | |
2135 | * doesn't allow the destination to know the size to read without fully | |
2136 | * parsing it through each devices load-state code (especially the open | |
2137 | * coded devices that use get/put). | |
2138 | * So we wrap the device state up in a package with a length at the start; | |
2139 | * to do this we use a qemu_buf to hold the whole of the device state. | |
2140 | */ | |
61b67d47 | 2141 | bioc = qio_channel_buffer_new(4096); |
6f01f136 | 2142 | qio_channel_set_name(QIO_CHANNEL(bioc), "migration-postcopy-buffer"); |
77ef2dc1 | 2143 | fb = qemu_file_new_output(QIO_CHANNEL(bioc)); |
61b67d47 | 2144 | object_unref(OBJECT(bioc)); |
1d34e4bf | 2145 | |
c76201ab DDAG |
2146 | /* |
2147 | * Make sure the receiver can get incoming pages before we send the rest | |
2148 | * of the state | |
2149 | */ | |
2150 | qemu_savevm_send_postcopy_listen(fb); | |
2151 | ||
a1fbe750 | 2152 | qemu_savevm_state_complete_precopy(fb, false, false); |
58110f0a VSO |
2153 | if (migrate_postcopy_ram()) { |
2154 | qemu_savevm_send_ping(fb, 3); | |
2155 | } | |
1d34e4bf DDAG |
2156 | |
2157 | qemu_savevm_send_postcopy_run(fb); | |
2158 | ||
2159 | /* <><> end of stuff going into the package */ | |
1d34e4bf | 2160 | |
ef8d6488 DDAG |
2161 | /* Last point of recovery; as soon as we send the package the destination |
2162 | * can open devices and potentially start running. | |
2163 | * Lets just check again we've not got any errors. | |
2164 | */ | |
2165 | ret = qemu_file_get_error(ms->to_dst_file); | |
2166 | if (ret) { | |
2167 | error_report("postcopy_start: Migration stream errored (pre package)"); | |
2168 | goto fail_closefb; | |
2169 | } | |
2170 | ||
2171 | restart_block = false; | |
2172 | ||
1d34e4bf | 2173 | /* Now send that blob */ |
61b67d47 | 2174 | if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) { |
1d34e4bf DDAG |
2175 | goto fail_closefb; |
2176 | } | |
2177 | qemu_fclose(fb); | |
b82fc321 DDAG |
2178 | |
2179 | /* Send a notify to give a chance for anything that needs to happen | |
2180 | * at the transition to postcopy and after the device state; in particular | |
2181 | * spice needs to trigger a transition now | |
2182 | */ | |
2183 | ms->postcopy_after_devices = true; | |
2184 | notifier_list_notify(&migration_state_notifiers, ms); | |
2185 | ||
1d34e4bf DDAG |
2186 | ms->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop; |
2187 | ||
2188 | qemu_mutex_unlock_iothread(); | |
2189 | ||
58110f0a VSO |
2190 | if (migrate_postcopy_ram()) { |
2191 | /* | |
2192 | * Although this ping is just for debug, it could potentially be | |
2193 | * used for getting a better measurement of downtime at the source. | |
2194 | */ | |
2195 | qemu_savevm_send_ping(ms->to_dst_file, 4); | |
2196 | } | |
1d34e4bf | 2197 | |
ced1c616 PB |
2198 | if (migrate_release_ram()) { |
2199 | ram_postcopy_migrated_memory_release(ms); | |
2200 | } | |
2201 | ||
89a02a9f | 2202 | ret = qemu_file_get_error(ms->to_dst_file); |
1d34e4bf DDAG |
2203 | if (ret) { |
2204 | error_report("postcopy_start: Migration stream errored"); | |
48781e5b | 2205 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1d34e4bf DDAG |
2206 | MIGRATION_STATUS_FAILED); |
2207 | } | |
2208 | ||
c01b16ed PX |
2209 | trace_postcopy_preempt_enabled(migrate_postcopy_preempt()); |
2210 | ||
1d34e4bf DDAG |
2211 | return ret; |
2212 | ||
2213 | fail_closefb: | |
2214 | qemu_fclose(fb); | |
2215 | fail: | |
48781e5b | 2216 | migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1d34e4bf | 2217 | MIGRATION_STATUS_FAILED); |
ef8d6488 DDAG |
2218 | if (restart_block) { |
2219 | /* A failure happened early enough that we know the destination hasn't | |
2220 | * accessed block devices, so we're safe to recover. | |
2221 | */ | |
2222 | Error *local_err = NULL; | |
2223 | ||
3b717194 | 2224 | bdrv_activate_all(&local_err); |
ef8d6488 DDAG |
2225 | if (local_err) { |
2226 | error_report_err(local_err); | |
2227 | } | |
2228 | } | |
1d34e4bf DDAG |
2229 | qemu_mutex_unlock_iothread(); |
2230 | return -1; | |
2231 | } | |
2232 | ||
e91d8951 DDAG |
2233 | /** |
2234 | * migration_maybe_pause: Pause if required to by | |
2235 | * migrate_pause_before_switchover called with the iothread locked | |
2236 | * Returns: 0 on success | |
2237 | */ | |
0331c8ca DDAG |
2238 | static int migration_maybe_pause(MigrationState *s, |
2239 | int *current_active_state, | |
2240 | int new_state) | |
e91d8951 DDAG |
2241 | { |
2242 | if (!migrate_pause_before_switchover()) { | |
2243 | return 0; | |
2244 | } | |
2245 | ||
2246 | /* Since leaving this state is not atomic with posting the semaphore | |
2247 | * it's possible that someone could have issued multiple migrate_continue | |
2248 | * and the semaphore is incorrectly positive at this point; | |
2249 | * the docs say it's undefined to reinit a semaphore that's already | |
2250 | * init'd, so use timedwait to eat up any existing posts. | |
2251 | */ | |
2252 | while (qemu_sem_timedwait(&s->pause_sem, 1) == 0) { | |
2253 | /* This block intentionally left blank */ | |
2254 | } | |
2255 | ||
8958338b ZF |
2256 | /* |
2257 | * If the migration is cancelled when it is in the completion phase, | |
2258 | * the migration state is set to MIGRATION_STATUS_CANCELLING. | |
2259 | * So we don't need to wait a semaphore, otherwise we would always | |
2260 | * wait for the 'pause_sem' semaphore. | |
2261 | */ | |
2262 | if (s->state != MIGRATION_STATUS_CANCELLING) { | |
2263 | qemu_mutex_unlock_iothread(); | |
2264 | migrate_set_state(&s->state, *current_active_state, | |
2265 | MIGRATION_STATUS_PRE_SWITCHOVER); | |
2266 | qemu_sem_wait(&s->pause_sem); | |
2267 | migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER, | |
2268 | new_state); | |
2269 | *current_active_state = new_state; | |
2270 | qemu_mutex_lock_iothread(); | |
2271 | } | |
e91d8951 | 2272 | |
0331c8ca | 2273 | return s->state == new_state ? 0 : -EINVAL; |
e91d8951 DDAG |
2274 | } |
2275 | ||
09f6c85e DDAG |
2276 | /** |
2277 | * migration_completion: Used by migration_thread when there's not much left. | |
2278 | * The caller 'breaks' the loop when this returns. | |
2279 | * | |
2280 | * @s: Current migration state | |
09f6c85e | 2281 | */ |
2ad87305 | 2282 | static void migration_completion(MigrationState *s) |
09f6c85e DDAG |
2283 | { |
2284 | int ret; | |
2ad87305 | 2285 | int current_active_state = s->state; |
09f6c85e | 2286 | |
b10ac0c4 DDAG |
2287 | if (s->state == MIGRATION_STATUS_ACTIVE) { |
2288 | qemu_mutex_lock_iothread(); | |
64909f97 | 2289 | s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
fb064112 | 2290 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); |
7287cbd4 | 2291 | s->vm_was_running = runstate_is_running(); |
b10ac0c4 DDAG |
2292 | ret = global_state_store(); |
2293 | ||
2294 | if (!ret) { | |
2295 | ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); | |
626ff651 | 2296 | trace_migration_completion_vm_stop(ret); |
e91d8951 | 2297 | if (ret >= 0) { |
0331c8ca DDAG |
2298 | ret = migration_maybe_pause(s, ¤t_active_state, |
2299 | MIGRATION_STATUS_DEVICE); | |
e91d8951 | 2300 | } |
f07fa4cb | 2301 | if (ret >= 0) { |
5e804644 | 2302 | s->block_inactive = !migrate_colo(); |
f07fa4cb | 2303 | qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); |
a1fbe750 | 2304 | ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false, |
5d39f44d | 2305 | s->block_inactive); |
f07fa4cb | 2306 | } |
b10ac0c4 DDAG |
2307 | } |
2308 | qemu_mutex_unlock_iothread(); | |
09f6c85e | 2309 | |
b10ac0c4 DDAG |
2310 | if (ret < 0) { |
2311 | goto fail; | |
09f6c85e | 2312 | } |
b10ac0c4 DDAG |
2313 | } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { |
2314 | trace_migration_completion_postcopy_end(); | |
2315 | ||
68b88468 | 2316 | qemu_mutex_lock_iothread(); |
89a02a9f | 2317 | qemu_savevm_state_complete_postcopy(s->to_dst_file); |
68b88468 EGE |
2318 | qemu_mutex_unlock_iothread(); |
2319 | ||
6621883f PX |
2320 | /* |
2321 | * Shutdown the postcopy fast path thread. This is only needed | |
2322 | * when dest QEMU binary is old (7.1/7.2). QEMU 8.0+ doesn't need | |
2323 | * this. | |
2324 | */ | |
2325 | if (migrate_postcopy_preempt() && s->preempt_pre_7_2) { | |
36f62f11 PX |
2326 | postcopy_preempt_shutdown_file(s); |
2327 | } | |
2328 | ||
b10ac0c4 | 2329 | trace_migration_completion_postcopy_end_after_complete(); |
444252b9 | 2330 | } else { |
6ba11211 | 2331 | goto fail; |
09f6c85e | 2332 | } |
09f6c85e | 2333 | |
b10ac0c4 DDAG |
2334 | /* |
2335 | * If rp was opened we must clean up the thread before | |
2336 | * cleaning everything else up (since if there are no failures | |
2337 | * it will wait for the destination to send it's status in | |
2338 | * a SHUT command). | |
b10ac0c4 | 2339 | */ |
53021ea1 | 2340 | if (s->rp_state.rp_thread_created) { |
b10ac0c4 | 2341 | int rp_error; |
0425dc97 | 2342 | trace_migration_return_path_end_before(); |
b10ac0c4 | 2343 | rp_error = await_return_path_close_on_source(s); |
0425dc97 | 2344 | trace_migration_return_path_end_after(rp_error); |
b10ac0c4 | 2345 | if (rp_error) { |
fe904ea8 | 2346 | goto fail_invalidate; |
b10ac0c4 | 2347 | } |
09f6c85e DDAG |
2348 | } |
2349 | ||
89a02a9f | 2350 | if (qemu_file_get_error(s->to_dst_file)) { |
09f6c85e | 2351 | trace_migration_completion_file_err(); |
fe904ea8 | 2352 | goto fail_invalidate; |
09f6c85e DDAG |
2353 | } |
2354 | ||
5e804644 | 2355 | if (migrate_colo() && s->state == MIGRATION_STATUS_ACTIVE) { |
eeeb48ee ZC |
2356 | /* COLO does not support postcopy */ |
2357 | migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE, | |
2358 | MIGRATION_STATUS_COLO); | |
2359 | } else { | |
0b827d5e HZ |
2360 | migrate_set_state(&s->state, current_active_state, |
2361 | MIGRATION_STATUS_COMPLETED); | |
2362 | } | |
2363 | ||
09f6c85e DDAG |
2364 | return; |
2365 | ||
fe904ea8 GK |
2366 | fail_invalidate: |
2367 | /* If not doing postcopy, vm_start() will be called: let's regain | |
2368 | * control on images. | |
2369 | */ | |
6039dd5b DDAG |
2370 | if (s->state == MIGRATION_STATUS_ACTIVE || |
2371 | s->state == MIGRATION_STATUS_DEVICE) { | |
fe904ea8 GK |
2372 | Error *local_err = NULL; |
2373 | ||
1d2acc31 | 2374 | qemu_mutex_lock_iothread(); |
3b717194 | 2375 | bdrv_activate_all(&local_err); |
fe904ea8 GK |
2376 | if (local_err) { |
2377 | error_report_err(local_err); | |
403d18ae | 2378 | s->block_inactive = true; |
1d2acc31 HZ |
2379 | } else { |
2380 | s->block_inactive = false; | |
fe904ea8 | 2381 | } |
1d2acc31 | 2382 | qemu_mutex_unlock_iothread(); |
fe904ea8 GK |
2383 | } |
2384 | ||
09f6c85e | 2385 | fail: |
48781e5b HZ |
2386 | migrate_set_state(&s->state, current_active_state, |
2387 | MIGRATION_STATUS_FAILED); | |
09f6c85e DDAG |
2388 | } |
2389 | ||
8518278a AG |
2390 | /** |
2391 | * bg_migration_completion: Used by bg_migration_thread when after all the | |
2392 | * RAM has been saved. The caller 'breaks' the loop when this returns. | |
2393 | * | |
2394 | * @s: Current migration state | |
2395 | */ | |
2396 | static void bg_migration_completion(MigrationState *s) | |
2397 | { | |
2398 | int current_active_state = s->state; | |
2399 | ||
2400 | /* | |
2401 | * Stop tracking RAM writes - un-protect memory, un-register UFFD | |
2402 | * memory ranges, flush kernel wait queues and wake up threads | |
2403 | * waiting for write fault to be resolved. | |
2404 | */ | |
2405 | ram_write_tracking_stop(); | |
2406 | ||
2407 | if (s->state == MIGRATION_STATUS_ACTIVE) { | |
2408 | /* | |
2409 | * By this moment we have RAM content saved into the migration stream. | |
2410 | * The next step is to flush the non-RAM content (device state) | |
2411 | * right after the ram content. The device state has been stored into | |
2412 | * the temporary buffer before RAM saving started. | |
2413 | */ | |
2414 | qemu_put_buffer(s->to_dst_file, s->bioc->data, s->bioc->usage); | |
2415 | qemu_fflush(s->to_dst_file); | |
2416 | } else if (s->state == MIGRATION_STATUS_CANCELLING) { | |
2417 | goto fail; | |
2418 | } | |
2419 | ||
2420 | if (qemu_file_get_error(s->to_dst_file)) { | |
2421 | trace_migration_completion_file_err(); | |
2422 | goto fail; | |
2423 | } | |
2424 | ||
2425 | migrate_set_state(&s->state, current_active_state, | |
2426 | MIGRATION_STATUS_COMPLETED); | |
2427 | return; | |
2428 | ||
2429 | fail: | |
2430 | migrate_set_state(&s->state, current_active_state, | |
2431 | MIGRATION_STATUS_FAILED); | |
2432 | } | |
2433 | ||
b23c2ade PX |
2434 | typedef enum MigThrError { |
2435 | /* No error detected */ | |
2436 | MIG_THR_ERR_NONE = 0, | |
2437 | /* Detected error, but resumed successfully */ | |
2438 | MIG_THR_ERR_RECOVERED = 1, | |
2439 | /* Detected fatal error, need to exit */ | |
2440 | MIG_THR_ERR_FATAL = 2, | |
2441 | } MigThrError; | |
2442 | ||
94190696 PX |
2443 | static int postcopy_resume_handshake(MigrationState *s) |
2444 | { | |
2445 | qemu_savevm_send_postcopy_resume(s->to_dst_file); | |
2446 | ||
2447 | while (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
2448 | qemu_sem_wait(&s->rp_state.rp_sem); | |
2449 | } | |
2450 | ||
2451 | if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) { | |
2452 | return 0; | |
2453 | } | |
2454 | ||
2455 | return -1; | |
2456 | } | |
2457 | ||
135b87b4 PX |
2458 | /* Return zero if success, or <0 for error */ |
2459 | static int postcopy_do_resume(MigrationState *s) | |
2460 | { | |
d1b8eadb PX |
2461 | int ret; |
2462 | ||
2463 | /* | |
2464 | * Call all the resume_prepare() hooks, so that modules can be | |
2465 | * ready for the migration resume. | |
2466 | */ | |
2467 | ret = qemu_savevm_state_resume_prepare(s); | |
2468 | if (ret) { | |
2469 | error_report("%s: resume_prepare() failure detected: %d", | |
2470 | __func__, ret); | |
2471 | return ret; | |
2472 | } | |
2473 | ||
5655aab0 PX |
2474 | /* |
2475 | * If preempt is enabled, re-establish the preempt channel. Note that | |
2476 | * we do it after resume prepare to make sure the main channel will be | |
2477 | * created before the preempt channel. E.g. with weak network, the | |
2478 | * dest QEMU may get messed up with the preempt and main channels on | |
2479 | * the order of connection setup. This guarantees the correct order. | |
2480 | */ | |
2481 | ret = postcopy_preempt_establish_channel(s); | |
2482 | if (ret) { | |
2483 | error_report("%s: postcopy_preempt_establish_channel(): %d", | |
2484 | __func__, ret); | |
2485 | return ret; | |
2486 | } | |
2487 | ||
d1b8eadb | 2488 | /* |
94190696 PX |
2489 | * Last handshake with destination on the resume (destination will |
2490 | * switch to postcopy-active afterwards) | |
d1b8eadb | 2491 | */ |
94190696 PX |
2492 | ret = postcopy_resume_handshake(s); |
2493 | if (ret) { | |
2494 | error_report("%s: handshake failed: %d", __func__, ret); | |
2495 | return ret; | |
2496 | } | |
d1b8eadb | 2497 | |
135b87b4 PX |
2498 | return 0; |
2499 | } | |
2500 | ||
b23c2ade PX |
2501 | /* |
2502 | * We don't return until we are in a safe state to continue current | |
2503 | * postcopy migration. Returns MIG_THR_ERR_RECOVERED if recovered, or | |
2504 | * MIG_THR_ERR_FATAL if unrecovery failure happened. | |
2505 | */ | |
2506 | static MigThrError postcopy_pause(MigrationState *s) | |
2507 | { | |
2508 | assert(s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
b23c2ade | 2509 | |
135b87b4 | 2510 | while (true) { |
62df066f PX |
2511 | QEMUFile *file; |
2512 | ||
39675fff PX |
2513 | /* |
2514 | * Current channel is possibly broken. Release it. Note that this is | |
2515 | * guaranteed even without lock because to_dst_file should only be | |
2516 | * modified by the migration thread. That also guarantees that the | |
2517 | * unregister of yank is safe too without the lock. It should be safe | |
2518 | * even to be within the qemu_file_lock, but we didn't do that to avoid | |
2519 | * taking more mutex (yank_lock) within qemu_file_lock. TL;DR: we make | |
2520 | * the qemu_file_lock critical section as small as possible. | |
2521 | */ | |
135b87b4 | 2522 | assert(s->to_dst_file); |
39675fff | 2523 | migration_ioc_unregister_yank_from_file(s->to_dst_file); |
62df066f PX |
2524 | qemu_mutex_lock(&s->qemu_file_lock); |
2525 | file = s->to_dst_file; | |
135b87b4 | 2526 | s->to_dst_file = NULL; |
62df066f PX |
2527 | qemu_mutex_unlock(&s->qemu_file_lock); |
2528 | ||
2529 | qemu_file_shutdown(file); | |
2530 | qemu_fclose(file); | |
b23c2ade | 2531 | |
d246ea50 PX |
2532 | migrate_set_state(&s->state, s->state, |
2533 | MIGRATION_STATUS_POSTCOPY_PAUSED); | |
2534 | ||
135b87b4 PX |
2535 | error_report("Detected IO failure for postcopy. " |
2536 | "Migration paused."); | |
b23c2ade | 2537 | |
135b87b4 PX |
2538 | /* |
2539 | * We wait until things fixed up. Then someone will setup the | |
2540 | * status back for us. | |
2541 | */ | |
2542 | while (s->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
2543 | qemu_sem_wait(&s->postcopy_pause_sem); | |
2544 | } | |
2545 | ||
2546 | if (s->state == MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
2547 | /* Woken up by a recover procedure. Give it a shot */ | |
b23c2ade | 2548 | |
135b87b4 PX |
2549 | /* |
2550 | * Firstly, let's wake up the return path now, with a new | |
2551 | * return path channel. | |
2552 | */ | |
2553 | qemu_sem_post(&s->postcopy_pause_rp_sem); | |
2554 | ||
2555 | /* Do the resume logic */ | |
2556 | if (postcopy_do_resume(s) == 0) { | |
2557 | /* Let's continue! */ | |
2558 | trace_postcopy_pause_continued(); | |
2559 | return MIG_THR_ERR_RECOVERED; | |
2560 | } else { | |
2561 | /* | |
2562 | * Something wrong happened during the recovery, let's | |
2563 | * pause again. Pause is always better than throwing | |
2564 | * data away. | |
2565 | */ | |
2566 | continue; | |
2567 | } | |
2568 | } else { | |
2569 | /* This is not right... Time to quit. */ | |
2570 | return MIG_THR_ERR_FATAL; | |
2571 | } | |
2572 | } | |
b23c2ade PX |
2573 | } |
2574 | ||
2575 | static MigThrError migration_detect_error(MigrationState *s) | |
2576 | { | |
2577 | int ret; | |
c3c5eae6 | 2578 | int state = s->state; |
3d661c8a | 2579 | Error *local_error = NULL; |
c3c5eae6 DDAG |
2580 | |
2581 | if (state == MIGRATION_STATUS_CANCELLING || | |
2582 | state == MIGRATION_STATUS_CANCELLED) { | |
2583 | /* End the migration, but don't set the state to failed */ | |
2584 | return MIG_THR_ERR_FATAL; | |
2585 | } | |
b23c2ade | 2586 | |
60bb3c58 PX |
2587 | /* |
2588 | * Try to detect any file errors. Note that postcopy_qemufile_src will | |
2589 | * be NULL when postcopy preempt is not enabled. | |
2590 | */ | |
2591 | ret = qemu_file_get_error_obj_any(s->to_dst_file, | |
2592 | s->postcopy_qemufile_src, | |
2593 | &local_error); | |
b23c2ade PX |
2594 | if (!ret) { |
2595 | /* Everything is fine */ | |
3d661c8a | 2596 | assert(!local_error); |
b23c2ade PX |
2597 | return MIG_THR_ERR_NONE; |
2598 | } | |
2599 | ||
3d661c8a YK |
2600 | if (local_error) { |
2601 | migrate_set_error(s, local_error); | |
2602 | error_free(local_error); | |
2603 | } | |
2604 | ||
d5c8f2af | 2605 | if (state == MIGRATION_STATUS_POSTCOPY_ACTIVE && ret) { |
b23c2ade PX |
2606 | /* |
2607 | * For postcopy, we allow the network to be down for a | |
2608 | * while. After that, it can be continued by a | |
2609 | * recovery phase. | |
2610 | */ | |
2611 | return postcopy_pause(s); | |
2612 | } else { | |
2613 | /* | |
2614 | * For precopy (or postcopy with error outside IO), we fail | |
2615 | * with no time. | |
2616 | */ | |
c3c5eae6 | 2617 | migrate_set_state(&s->state, state, MIGRATION_STATUS_FAILED); |
b23c2ade PX |
2618 | trace_migration_thread_file_err(); |
2619 | ||
2620 | /* Time to stop the migration, now. */ | |
2621 | return MIG_THR_ERR_FATAL; | |
2622 | } | |
2623 | } | |
2624 | ||
268dcd46 | 2625 | /* How many bytes have we transferred since the beginning of the migration */ |
0c8f0efd JQ |
2626 | static uint64_t migration_total_bytes(MigrationState *s) |
2627 | { | |
fbfa6404 | 2628 | return qemu_file_total_transferred(s->to_dst_file) + |
cf671116 | 2629 | stat64_get(&ram_counters.multifd_bytes); |
0c8f0efd JQ |
2630 | } |
2631 | ||
cf011f08 PX |
2632 | static void migration_calculate_complete(MigrationState *s) |
2633 | { | |
0c8f0efd | 2634 | uint64_t bytes = migration_total_bytes(s); |
cf011f08 | 2635 | int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
6cde6fbe | 2636 | int64_t transfer_time; |
cf011f08 PX |
2637 | |
2638 | s->total_time = end_time - s->start_time; | |
2639 | if (!s->downtime) { | |
2640 | /* | |
2641 | * It's still not set, so we are precopy migration. For | |
2642 | * postcopy, downtime is calculated during postcopy_start(). | |
2643 | */ | |
2644 | s->downtime = end_time - s->downtime_start; | |
2645 | } | |
2646 | ||
6cde6fbe JQ |
2647 | transfer_time = s->total_time - s->setup_time; |
2648 | if (transfer_time) { | |
2649 | s->mbps = ((double) bytes * 8.0) / transfer_time / 1000; | |
cf011f08 PX |
2650 | } |
2651 | } | |
2652 | ||
87f3bd87 IR |
2653 | static void update_iteration_initial_status(MigrationState *s) |
2654 | { | |
2655 | /* | |
2656 | * Update these three fields at the same time to avoid mismatch info lead | |
2657 | * wrong speed calculation. | |
2658 | */ | |
2659 | s->iteration_start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
2660 | s->iteration_initial_bytes = migration_total_bytes(s); | |
2661 | s->iteration_initial_pages = ram_get_total_transferred_pages(); | |
2662 | } | |
2663 | ||
b15df1ae PX |
2664 | static void migration_update_counters(MigrationState *s, |
2665 | int64_t current_time) | |
2666 | { | |
aecbfe9c | 2667 | uint64_t transferred, transferred_pages, time_spent; |
0c8f0efd | 2668 | uint64_t current_bytes; /* bytes transferred since the beginning */ |
b15df1ae PX |
2669 | double bandwidth; |
2670 | ||
2671 | if (current_time < s->iteration_start_time + BUFFER_DELAY) { | |
2672 | return; | |
2673 | } | |
2674 | ||
0c8f0efd JQ |
2675 | current_bytes = migration_total_bytes(s); |
2676 | transferred = current_bytes - s->iteration_initial_bytes; | |
b15df1ae PX |
2677 | time_spent = current_time - s->iteration_start_time; |
2678 | bandwidth = (double)transferred / time_spent; | |
f5da8ba4 | 2679 | s->threshold_size = bandwidth * migrate_downtime_limit(); |
b15df1ae PX |
2680 | |
2681 | s->mbps = (((double) transferred * 8.0) / | |
2682 | ((double) time_spent / 1000.0)) / 1000.0 / 1000.0; | |
2683 | ||
aecbfe9c XG |
2684 | transferred_pages = ram_get_total_transferred_pages() - |
2685 | s->iteration_initial_pages; | |
2686 | s->pages_per_second = (double) transferred_pages / | |
2687 | (((double) time_spent / 1000.0)); | |
2688 | ||
b15df1ae PX |
2689 | /* |
2690 | * if we haven't sent anything, we don't want to | |
2691 | * recalculate. 10000 is a small enough number for our purposes | |
2692 | */ | |
72f8e587 JQ |
2693 | if (stat64_get(&ram_counters.dirty_pages_rate) && |
2694 | transferred > 10000) { | |
650af890 | 2695 | s->expected_downtime = ram_counters.remaining / bandwidth; |
b15df1ae PX |
2696 | } |
2697 | ||
2698 | qemu_file_reset_rate_limit(s->to_dst_file); | |
2699 | ||
87f3bd87 | 2700 | update_iteration_initial_status(s); |
b15df1ae PX |
2701 | |
2702 | trace_migrate_transferred(transferred, time_spent, | |
0781c1ed | 2703 | bandwidth, s->threshold_size); |
b15df1ae PX |
2704 | } |
2705 | ||
2ad87305 PX |
2706 | /* Migration thread iteration status */ |
2707 | typedef enum { | |
2708 | MIG_ITERATE_RESUME, /* Resume current iteration */ | |
2709 | MIG_ITERATE_SKIP, /* Skip current iteration */ | |
2710 | MIG_ITERATE_BREAK, /* Break the loop */ | |
2711 | } MigIterateState; | |
2712 | ||
2713 | /* | |
2714 | * Return true if continue to the next iteration directly, false | |
2715 | * otherwise. | |
2716 | */ | |
2717 | static MigIterateState migration_iteration_run(MigrationState *s) | |
2718 | { | |
24beea4e | 2719 | uint64_t must_precopy, can_postcopy; |
2ad87305 PX |
2720 | bool in_postcopy = s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE; |
2721 | ||
24beea4e JQ |
2722 | qemu_savevm_state_pending_estimate(&must_precopy, &can_postcopy); |
2723 | uint64_t pending_size = must_precopy + can_postcopy; | |
2ad87305 | 2724 | |
24beea4e | 2725 | trace_migrate_pending_estimate(pending_size, must_precopy, can_postcopy); |
c8df4a7a | 2726 | |
24beea4e JQ |
2727 | if (must_precopy <= s->threshold_size) { |
2728 | qemu_savevm_state_pending_exact(&must_precopy, &can_postcopy); | |
2729 | pending_size = must_precopy + can_postcopy; | |
2730 | trace_migrate_pending_exact(pending_size, must_precopy, can_postcopy); | |
c8df4a7a | 2731 | } |
2ad87305 | 2732 | |
d9df9292 | 2733 | if (!pending_size || pending_size < s->threshold_size) { |
2ad87305 PX |
2734 | trace_migration_thread_low_pending(pending_size); |
2735 | migration_completion(s); | |
2736 | return MIG_ITERATE_BREAK; | |
2737 | } | |
2738 | ||
d9df9292 | 2739 | /* Still a significant amount to transfer */ |
24beea4e | 2740 | if (!in_postcopy && must_precopy <= s->threshold_size && |
d9df9292 JQ |
2741 | qatomic_read(&s->start_postcopy)) { |
2742 | if (postcopy_start(s)) { | |
2743 | error_report("%s: postcopy failed to start", __func__); | |
2744 | } | |
2745 | return MIG_ITERATE_SKIP; | |
2746 | } | |
2747 | ||
2748 | /* Just another iteration step */ | |
2749 | qemu_savevm_state_iterate(s->to_dst_file, in_postcopy); | |
2ad87305 PX |
2750 | return MIG_ITERATE_RESUME; |
2751 | } | |
2752 | ||
199aa6d4 PX |
2753 | static void migration_iteration_finish(MigrationState *s) |
2754 | { | |
2755 | /* If we enabled cpu throttling for auto-converge, turn it off. */ | |
2756 | cpu_throttle_stop(); | |
2757 | ||
2758 | qemu_mutex_lock_iothread(); | |
2759 | switch (s->state) { | |
2760 | case MIGRATION_STATUS_COMPLETED: | |
2761 | migration_calculate_complete(s); | |
2762 | runstate_set(RUN_STATE_POSTMIGRATE); | |
2763 | break; | |
751fe4c6 | 2764 | case MIGRATION_STATUS_COLO: |
5e804644 | 2765 | if (!migrate_colo()) { |
199aa6d4 PX |
2766 | error_report("%s: critical error: calling COLO code without " |
2767 | "COLO enabled", __func__); | |
2768 | } | |
2769 | migrate_start_colo_process(s); | |
199aa6d4 PX |
2770 | s->vm_was_running = true; |
2771 | /* Fallthrough */ | |
2772 | case MIGRATION_STATUS_FAILED: | |
2773 | case MIGRATION_STATUS_CANCELLED: | |
57225e5f | 2774 | case MIGRATION_STATUS_CANCELLING: |
199aa6d4 | 2775 | if (s->vm_was_running) { |
aa505f8e RL |
2776 | if (!runstate_check(RUN_STATE_SHUTDOWN)) { |
2777 | vm_start(); | |
2778 | } | |
199aa6d4 PX |
2779 | } else { |
2780 | if (runstate_check(RUN_STATE_FINISH_MIGRATE)) { | |
2781 | runstate_set(RUN_STATE_POSTMIGRATE); | |
2782 | } | |
2783 | } | |
2784 | break; | |
2785 | ||
2786 | default: | |
2787 | /* Should not reach here, but if so, forgive the VM. */ | |
2788 | error_report("%s: Unknown ending state %d", __func__, s->state); | |
2789 | break; | |
2790 | } | |
fd392cfa | 2791 | migrate_fd_cleanup_schedule(s); |
199aa6d4 PX |
2792 | qemu_mutex_unlock_iothread(); |
2793 | } | |
2794 | ||
8518278a AG |
2795 | static void bg_migration_iteration_finish(MigrationState *s) |
2796 | { | |
2797 | qemu_mutex_lock_iothread(); | |
2798 | switch (s->state) { | |
2799 | case MIGRATION_STATUS_COMPLETED: | |
2800 | migration_calculate_complete(s); | |
2801 | break; | |
2802 | ||
2803 | case MIGRATION_STATUS_ACTIVE: | |
2804 | case MIGRATION_STATUS_FAILED: | |
2805 | case MIGRATION_STATUS_CANCELLED: | |
2806 | case MIGRATION_STATUS_CANCELLING: | |
2807 | break; | |
2808 | ||
2809 | default: | |
2810 | /* Should not reach here, but if so, forgive the VM. */ | |
2811 | error_report("%s: Unknown ending state %d", __func__, s->state); | |
2812 | break; | |
2813 | } | |
2814 | ||
2815 | migrate_fd_cleanup_schedule(s); | |
2816 | qemu_mutex_unlock_iothread(); | |
2817 | } | |
2818 | ||
2819 | /* | |
2820 | * Return true if continue to the next iteration directly, false | |
2821 | * otherwise. | |
2822 | */ | |
2823 | static MigIterateState bg_migration_iteration_run(MigrationState *s) | |
2824 | { | |
2825 | int res; | |
2826 | ||
2827 | res = qemu_savevm_state_iterate(s->to_dst_file, false); | |
2828 | if (res > 0) { | |
2829 | bg_migration_completion(s); | |
2830 | return MIG_ITERATE_BREAK; | |
2831 | } | |
2832 | ||
2833 | return MIG_ITERATE_RESUME; | |
2834 | } | |
2835 | ||
ad767bed DDAG |
2836 | void migration_make_urgent_request(void) |
2837 | { | |
2838 | qemu_sem_post(&migrate_get_current()->rate_limit_sem); | |
2839 | } | |
2840 | ||
2841 | void migration_consume_urgent_request(void) | |
2842 | { | |
2843 | qemu_sem_wait(&migrate_get_current()->rate_limit_sem); | |
2844 | } | |
2845 | ||
97e1e067 DDAG |
2846 | /* Returns true if the rate limiting was broken by an urgent request */ |
2847 | bool migration_rate_limit(void) | |
2848 | { | |
2849 | int64_t now = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
2850 | MigrationState *s = migrate_get_current(); | |
2851 | ||
2852 | bool urgent = false; | |
2853 | migration_update_counters(s, now); | |
2854 | if (qemu_file_rate_limit(s->to_dst_file)) { | |
77386127 LS |
2855 | |
2856 | if (qemu_file_get_error(s->to_dst_file)) { | |
2857 | return false; | |
2858 | } | |
97e1e067 DDAG |
2859 | /* |
2860 | * Wait for a delay to do rate limiting OR | |
2861 | * something urgent to post the semaphore. | |
2862 | */ | |
2863 | int ms = s->iteration_start_time + BUFFER_DELAY - now; | |
2864 | trace_migration_rate_limit_pre(ms); | |
2865 | if (qemu_sem_timedwait(&s->rate_limit_sem, ms) == 0) { | |
2866 | /* | |
2867 | * We were woken by one or more urgent things but | |
2868 | * the timedwait will have consumed one of them. | |
2869 | * The service routine for the urgent wake will dec | |
2870 | * the semaphore itself for each item it consumes, | |
2871 | * so add this one we just eat back. | |
2872 | */ | |
2873 | qemu_sem_post(&s->rate_limit_sem); | |
2874 | urgent = true; | |
2875 | } | |
2876 | trace_migration_rate_limit_post(urgent); | |
2877 | } | |
2878 | return urgent; | |
2879 | } | |
2880 | ||
fde93d99 LV |
2881 | /* |
2882 | * if failover devices are present, wait they are completely | |
2883 | * unplugged | |
2884 | */ | |
2885 | ||
2886 | static void qemu_savevm_wait_unplug(MigrationState *s, int old_state, | |
2887 | int new_state) | |
2888 | { | |
2889 | if (qemu_savevm_state_guest_unplug_pending()) { | |
2890 | migrate_set_state(&s->state, old_state, MIGRATION_STATUS_WAIT_UNPLUG); | |
2891 | ||
2892 | while (s->state == MIGRATION_STATUS_WAIT_UNPLUG && | |
2893 | qemu_savevm_state_guest_unplug_pending()) { | |
2894 | qemu_sem_timedwait(&s->wait_unplug_sem, 250); | |
2895 | } | |
944bc528 LV |
2896 | if (s->state != MIGRATION_STATUS_WAIT_UNPLUG) { |
2897 | int timeout = 120; /* 30 seconds */ | |
2898 | /* | |
2899 | * migration has been canceled | |
2900 | * but as we have started an unplug we must wait the end | |
2901 | * to be able to plug back the card | |
2902 | */ | |
2903 | while (timeout-- && qemu_savevm_state_guest_unplug_pending()) { | |
2904 | qemu_sem_timedwait(&s->wait_unplug_sem, 250); | |
2905 | } | |
1b529d90 LV |
2906 | if (qemu_savevm_state_guest_unplug_pending() && |
2907 | !qtest_enabled()) { | |
a51dcef0 LV |
2908 | warn_report("migration: partially unplugged device on " |
2909 | "failure"); | |
2910 | } | |
944bc528 | 2911 | } |
fde93d99 LV |
2912 | |
2913 | migrate_set_state(&s->state, MIGRATION_STATUS_WAIT_UNPLUG, new_state); | |
2914 | } else { | |
2915 | migrate_set_state(&s->state, old_state, new_state); | |
2916 | } | |
2917 | } | |
2918 | ||
70b20477 DDAG |
2919 | /* |
2920 | * Master migration thread on the source VM. | |
2921 | * It drives the migration and pumps the data down the outgoing channel. | |
2922 | */ | |
5f496a1b | 2923 | static void *migration_thread(void *opaque) |
0d82d0e8 | 2924 | { |
9848a404 | 2925 | MigrationState *s = opaque; |
1b1f4ab6 | 2926 | MigrationThread *thread = NULL; |
bc72ad67 | 2927 | int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); |
b23c2ade | 2928 | MigThrError thr_error; |
ad767bed | 2929 | bool urgent = false; |
76f5933a | 2930 | |
1b1f4ab6 JJ |
2931 | thread = MigrationThreadAdd("live_migration", qemu_get_thread_id()); |
2932 | ||
ab28bd23 PB |
2933 | rcu_register_thread(); |
2934 | ||
892ae715 | 2935 | object_ref(OBJECT(s)); |
87f3bd87 | 2936 | update_iteration_initial_status(s); |
b15df1ae | 2937 | |
89a02a9f | 2938 | qemu_savevm_state_header(s->to_dst_file); |
1d34e4bf | 2939 | |
62a02658 PX |
2940 | /* |
2941 | * If we opened the return path, we need to make sure dst has it | |
2942 | * opened as well. | |
2943 | */ | |
43044ac0 | 2944 | if (s->rp_state.rp_thread_created) { |
1d34e4bf | 2945 | /* Now tell the dest that it should open its end so it can reply */ |
89a02a9f | 2946 | qemu_savevm_send_open_return_path(s->to_dst_file); |
1d34e4bf DDAG |
2947 | |
2948 | /* And do a ping that will make stuff easier to debug */ | |
89a02a9f | 2949 | qemu_savevm_send_ping(s->to_dst_file, 1); |
0425dc97 | 2950 | } |
1d34e4bf | 2951 | |
58110f0a | 2952 | if (migrate_postcopy()) { |
1d34e4bf DDAG |
2953 | /* |
2954 | * Tell the destination that we *might* want to do postcopy later; | |
2955 | * if the other end can't do postcopy it should fail now, nice and | |
2956 | * early. | |
2957 | */ | |
89a02a9f | 2958 | qemu_savevm_send_postcopy_advise(s->to_dst_file); |
1d34e4bf DDAG |
2959 | } |
2960 | ||
5e804644 | 2961 | if (migrate_colo()) { |
aad555c2 ZC |
2962 | /* Notify migration destination that we enable COLO */ |
2963 | qemu_savevm_send_colo_enable(s->to_dst_file); | |
2964 | } | |
2965 | ||
9907e842 | 2966 | qemu_savevm_state_setup(s->to_dst_file); |
0d82d0e8 | 2967 | |
fde93d99 LV |
2968 | qemu_savevm_wait_unplug(s, MIGRATION_STATUS_SETUP, |
2969 | MIGRATION_STATUS_ACTIVE); | |
c7e0acd5 | 2970 | |
bc72ad67 | 2971 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; |
29ae8a41 | 2972 | |
9ec055ae DDAG |
2973 | trace_migration_thread_setup_complete(); |
2974 | ||
8f8d528e | 2975 | while (migration_is_active(s)) { |
ad767bed | 2976 | if (urgent || !qemu_file_rate_limit(s->to_dst_file)) { |
2ad87305 PX |
2977 | MigIterateState iter_state = migration_iteration_run(s); |
2978 | if (iter_state == MIG_ITERATE_SKIP) { | |
2979 | continue; | |
2980 | } else if (iter_state == MIG_ITERATE_BREAK) { | |
09f6c85e | 2981 | break; |
c369f40d JQ |
2982 | } |
2983 | } | |
f4410a5d | 2984 | |
b23c2ade PX |
2985 | /* |
2986 | * Try to detect any kind of failures, and see whether we | |
2987 | * should stop the migration now. | |
2988 | */ | |
2989 | thr_error = migration_detect_error(s); | |
2990 | if (thr_error == MIG_THR_ERR_FATAL) { | |
2991 | /* Stop migration */ | |
fd45ee2c | 2992 | break; |
b23c2ade PX |
2993 | } else if (thr_error == MIG_THR_ERR_RECOVERED) { |
2994 | /* | |
2995 | * Just recovered from a e.g. network failure, reset all | |
2996 | * the local variables. This is important to avoid | |
2997 | * breaking transferred_bytes and bandwidth calculation | |
2998 | */ | |
87f3bd87 | 2999 | update_iteration_initial_status(s); |
fd45ee2c | 3000 | } |
b15df1ae | 3001 | |
97e1e067 | 3002 | urgent = migration_rate_limit(); |
a3fa1d78 PB |
3003 | } |
3004 | ||
1d34e4bf | 3005 | trace_migration_thread_after_loop(); |
199aa6d4 | 3006 | migration_iteration_finish(s); |
892ae715 | 3007 | object_unref(OBJECT(s)); |
ab28bd23 | 3008 | rcu_unregister_thread(); |
1b1f4ab6 | 3009 | MigrationThreadDel(thread); |
0d82d0e8 JQ |
3010 | return NULL; |
3011 | } | |
3012 | ||
8518278a AG |
3013 | static void bg_migration_vm_start_bh(void *opaque) |
3014 | { | |
3015 | MigrationState *s = opaque; | |
3016 | ||
3017 | qemu_bh_delete(s->vm_start_bh); | |
3018 | s->vm_start_bh = NULL; | |
3019 | ||
3020 | vm_start(); | |
3021 | s->downtime = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - s->downtime_start; | |
3022 | } | |
3023 | ||
3024 | /** | |
3025 | * Background snapshot thread, based on live migration code. | |
3026 | * This is an alternative implementation of live migration mechanism | |
3027 | * introduced specifically to support background snapshots. | |
3028 | * | |
3029 | * It takes advantage of userfault_fd write protection mechanism introduced | |
3030 | * in v5.7 kernel. Compared to existing dirty page logging migration much | |
3031 | * lesser stream traffic is produced resulting in smaller snapshot images, | |
3032 | * simply cause of no page duplicates can get into the stream. | |
3033 | * | |
3034 | * Another key point is that generated vmstate stream reflects machine state | |
3035 | * 'frozen' at the beginning of snapshot creation compared to dirty page logging | |
3036 | * mechanism, which effectively results in that saved snapshot is the state of VM | |
3037 | * at the end of the process. | |
3038 | */ | |
3039 | static void *bg_migration_thread(void *opaque) | |
3040 | { | |
3041 | MigrationState *s = opaque; | |
3042 | int64_t setup_start; | |
3043 | MigThrError thr_error; | |
3044 | QEMUFile *fb; | |
3045 | bool early_fail = true; | |
3046 | ||
3047 | rcu_register_thread(); | |
3048 | object_ref(OBJECT(s)); | |
3049 | ||
3050 | qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX); | |
3051 | ||
3052 | setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST); | |
3053 | /* | |
3054 | * We want to save vmstate for the moment when migration has been | |
3055 | * initiated but also we want to save RAM content while VM is running. | |
3056 | * The RAM content should appear first in the vmstate. So, we first | |
3057 | * stash the non-RAM part of the vmstate to the temporary buffer, | |
3058 | * then write RAM part of the vmstate to the migration stream | |
3059 | * with vCPUs running and, finally, write stashed non-RAM part of | |
3060 | * the vmstate from the buffer to the migration stream. | |
3061 | */ | |
ecb23efe | 3062 | s->bioc = qio_channel_buffer_new(512 * 1024); |
8518278a | 3063 | qio_channel_set_name(QIO_CHANNEL(s->bioc), "vmstate-buffer"); |
77ef2dc1 | 3064 | fb = qemu_file_new_output(QIO_CHANNEL(s->bioc)); |
8518278a AG |
3065 | object_unref(OBJECT(s->bioc)); |
3066 | ||
3067 | update_iteration_initial_status(s); | |
3068 | ||
eeccb99c AG |
3069 | /* |
3070 | * Prepare for tracking memory writes with UFFD-WP - populate | |
3071 | * RAM pages before protecting. | |
3072 | */ | |
3073 | #ifdef __linux__ | |
3074 | ram_write_tracking_prepare(); | |
3075 | #endif | |
3076 | ||
8518278a AG |
3077 | qemu_savevm_state_header(s->to_dst_file); |
3078 | qemu_savevm_state_setup(s->to_dst_file); | |
3079 | ||
fde93d99 LV |
3080 | qemu_savevm_wait_unplug(s, MIGRATION_STATUS_SETUP, |
3081 | MIGRATION_STATUS_ACTIVE); | |
8518278a | 3082 | |
8518278a AG |
3083 | s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; |
3084 | ||
3085 | trace_migration_thread_setup_complete(); | |
3086 | s->downtime_start = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
3087 | ||
3088 | qemu_mutex_lock_iothread(); | |
3089 | ||
3090 | /* | |
3091 | * If VM is currently in suspended state, then, to make a valid runstate | |
3092 | * transition in vm_stop_force_state() we need to wakeup it up. | |
3093 | */ | |
3094 | qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL); | |
3095 | s->vm_was_running = runstate_is_running(); | |
3096 | ||
3097 | if (global_state_store()) { | |
3098 | goto fail; | |
3099 | } | |
3100 | /* Forcibly stop VM before saving state of vCPUs and devices */ | |
3101 | if (vm_stop_force_state(RUN_STATE_PAUSED)) { | |
3102 | goto fail; | |
3103 | } | |
3104 | /* | |
3105 | * Put vCPUs in sync with shadow context structures, then | |
3106 | * save their state to channel-buffer along with devices. | |
3107 | */ | |
3108 | cpu_synchronize_all_states(); | |
3109 | if (qemu_savevm_state_complete_precopy_non_iterable(fb, false, false)) { | |
3110 | goto fail; | |
3111 | } | |
ecb23efe AG |
3112 | /* |
3113 | * Since we are going to get non-iterable state data directly | |
3114 | * from s->bioc->data, explicit flush is needed here. | |
3115 | */ | |
3116 | qemu_fflush(fb); | |
3117 | ||
8518278a AG |
3118 | /* Now initialize UFFD context and start tracking RAM writes */ |
3119 | if (ram_write_tracking_start()) { | |
3120 | goto fail; | |
3121 | } | |
3122 | early_fail = false; | |
3123 | ||
3124 | /* | |
3125 | * Start VM from BH handler to avoid write-fault lock here. | |
3126 | * UFFD-WP protection for the whole RAM is already enabled so | |
3127 | * calling VM state change notifiers from vm_start() would initiate | |
3128 | * writes to virtio VQs memory which is in write-protected region. | |
3129 | */ | |
3130 | s->vm_start_bh = qemu_bh_new(bg_migration_vm_start_bh, s); | |
3131 | qemu_bh_schedule(s->vm_start_bh); | |
3132 | ||
3133 | qemu_mutex_unlock_iothread(); | |
3134 | ||
3135 | while (migration_is_active(s)) { | |
3136 | MigIterateState iter_state = bg_migration_iteration_run(s); | |
3137 | if (iter_state == MIG_ITERATE_SKIP) { | |
3138 | continue; | |
3139 | } else if (iter_state == MIG_ITERATE_BREAK) { | |
3140 | break; | |
3141 | } | |
3142 | ||
3143 | /* | |
3144 | * Try to detect any kind of failures, and see whether we | |
3145 | * should stop the migration now. | |
3146 | */ | |
3147 | thr_error = migration_detect_error(s); | |
3148 | if (thr_error == MIG_THR_ERR_FATAL) { | |
3149 | /* Stop migration */ | |
3150 | break; | |
3151 | } | |
3152 | ||
3153 | migration_update_counters(s, qemu_clock_get_ms(QEMU_CLOCK_REALTIME)); | |
3154 | } | |
3155 | ||
3156 | trace_migration_thread_after_loop(); | |
3157 | ||
3158 | fail: | |
3159 | if (early_fail) { | |
3160 | migrate_set_state(&s->state, MIGRATION_STATUS_ACTIVE, | |
3161 | MIGRATION_STATUS_FAILED); | |
3162 | qemu_mutex_unlock_iothread(); | |
3163 | } | |
3164 | ||
3165 | bg_migration_iteration_finish(s); | |
3166 | ||
3167 | qemu_fclose(fb); | |
3168 | object_unref(OBJECT(s)); | |
3169 | rcu_unregister_thread(); | |
3170 | ||
3171 | return NULL; | |
3172 | } | |
3173 | ||
cce8040b | 3174 | void migrate_fd_connect(MigrationState *s, Error *error_in) |
0d82d0e8 | 3175 | { |
00f4b572 | 3176 | Error *local_err = NULL; |
d3e35b8f PX |
3177 | int64_t rate_limit; |
3178 | bool resume = s->state == MIGRATION_STATUS_POSTCOPY_PAUSED; | |
3179 | ||
ca7bd082 PX |
3180 | /* |
3181 | * If there's a previous error, free it and prepare for another one. | |
3182 | * Meanwhile if migration completes successfully, there won't have an error | |
3183 | * dumped when calling migrate_fd_cleanup(). | |
3184 | */ | |
3185 | migrate_error_free(s); | |
3186 | ||
f5da8ba4 | 3187 | s->expected_downtime = migrate_downtime_limit(); |
9cbc3649 MAL |
3188 | if (resume) { |
3189 | assert(s->cleanup_bh); | |
3190 | } else { | |
3191 | assert(!s->cleanup_bh); | |
3192 | s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup_bh, s); | |
3193 | } | |
cce8040b DDAG |
3194 | if (error_in) { |
3195 | migrate_fd_error(s, error_in); | |
ca30f24d PX |
3196 | if (resume) { |
3197 | /* | |
3198 | * Don't do cleanup for resume if channel is invalid, but only dump | |
3199 | * the error. We wait for another channel connect from the user. | |
3200 | * The error_report still gives HMP user a hint on what failed. | |
3201 | * It's normally done in migrate_fd_cleanup(), but call it here | |
3202 | * explicitly. | |
3203 | */ | |
3204 | error_report_err(error_copy(s->error)); | |
3205 | } else { | |
3206 | migrate_fd_cleanup(s); | |
3207 | } | |
cce8040b DDAG |
3208 | return; |
3209 | } | |
0d82d0e8 | 3210 | |
d3e35b8f PX |
3211 | if (resume) { |
3212 | /* This is a resumed migration */ | |
5390adec | 3213 | rate_limit = migrate_max_postcopy_bandwidth() / |
8504ddec | 3214 | XFER_LIMIT_RATIO; |
d3e35b8f PX |
3215 | } else { |
3216 | /* This is a fresh new migration */ | |
9c894df3 | 3217 | rate_limit = migrate_max_bandwidth() / XFER_LIMIT_RATIO; |
442773ce | 3218 | |
d3e35b8f PX |
3219 | /* Notify before starting migration thread */ |
3220 | notifier_list_notify(&migration_state_notifiers, s); | |
3221 | } | |
3222 | ||
3223 | qemu_file_set_rate_limit(s->to_dst_file, rate_limit); | |
3224 | qemu_file_set_blocking(s->to_dst_file, true); | |
9287ac27 | 3225 | |
1d34e4bf | 3226 | /* |
c788ada8 PX |
3227 | * Open the return path. For postcopy, it is used exclusively. For |
3228 | * precopy, only if user specified "return-path" capability would | |
3229 | * QEMU uses the return path. | |
1d34e4bf | 3230 | */ |
38ad1110 | 3231 | if (migrate_postcopy_ram() || migrate_return_path()) { |
d3e35b8f | 3232 | if (open_return_path_on_source(s, !resume)) { |
1d34e4bf | 3233 | error_report("Unable to open return-path for postcopy"); |
d3e35b8f | 3234 | migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED); |
1d34e4bf DDAG |
3235 | migrate_fd_cleanup(s); |
3236 | return; | |
3237 | } | |
3238 | } | |
3239 | ||
06064a67 PX |
3240 | /* |
3241 | * This needs to be done before resuming a postcopy. Note: for newer | |
3242 | * QEMUs we will delay the channel creation until postcopy_start(), to | |
3243 | * avoid disorder of channel creations. | |
3244 | */ | |
3245 | if (migrate_postcopy_preempt() && s->preempt_pre_7_2) { | |
3246 | postcopy_preempt_setup(s); | |
3247 | } | |
3248 | ||
d3e35b8f | 3249 | if (resume) { |
135b87b4 PX |
3250 | /* Wakeup the main migration thread to do the recovery */ |
3251 | migrate_set_state(&s->state, MIGRATION_STATUS_POSTCOPY_PAUSED, | |
3252 | MIGRATION_STATUS_POSTCOPY_RECOVER); | |
3253 | qemu_sem_post(&s->postcopy_pause_sem); | |
d3e35b8f PX |
3254 | return; |
3255 | } | |
3256 | ||
00f4b572 JQ |
3257 | if (multifd_save_setup(&local_err) != 0) { |
3258 | error_report_err(local_err); | |
f986c3d2 JQ |
3259 | migrate_set_state(&s->state, MIGRATION_STATUS_SETUP, |
3260 | MIGRATION_STATUS_FAILED); | |
3261 | migrate_fd_cleanup(s); | |
3262 | return; | |
3263 | } | |
8518278a AG |
3264 | |
3265 | if (migrate_background_snapshot()) { | |
3266 | qemu_thread_create(&s->thread, "bg_snapshot", | |
3267 | bg_migration_thread, s, QEMU_THREAD_JOINABLE); | |
3268 | } else { | |
3269 | qemu_thread_create(&s->thread, "live_migration", | |
3270 | migration_thread, s, QEMU_THREAD_JOINABLE); | |
3271 | } | |
1d34e4bf | 3272 | s->migration_thread_running = true; |
0d82d0e8 | 3273 | } |
093e3c42 | 3274 | |
e5cb7e76 PX |
3275 | static void migration_class_init(ObjectClass *klass, void *data) |
3276 | { | |
3277 | DeviceClass *dc = DEVICE_CLASS(klass); | |
3278 | ||
3279 | dc->user_creatable = false; | |
4f67d30b | 3280 | device_class_set_props(dc, migration_properties); |
e5cb7e76 PX |
3281 | } |
3282 | ||
b91bf5e4 MAL |
3283 | static void migration_instance_finalize(Object *obj) |
3284 | { | |
3285 | MigrationState *ms = MIGRATION_OBJ(obj); | |
b91bf5e4 | 3286 | |
87db1a7d | 3287 | qemu_mutex_destroy(&ms->error_mutex); |
62df066f | 3288 | qemu_mutex_destroy(&ms->qemu_file_lock); |
c7e0acd5 | 3289 | qemu_sem_destroy(&ms->wait_unplug_sem); |
ad767bed | 3290 | qemu_sem_destroy(&ms->rate_limit_sem); |
e91d8951 | 3291 | qemu_sem_destroy(&ms->pause_sem); |
b23c2ade | 3292 | qemu_sem_destroy(&ms->postcopy_pause_sem); |
14b1742e | 3293 | qemu_sem_destroy(&ms->postcopy_pause_rp_sem); |
edd090c7 | 3294 | qemu_sem_destroy(&ms->rp_state.rp_sem); |
b28fb582 | 3295 | qemu_sem_destroy(&ms->rp_state.rp_pong_acks); |
d0edb8a1 | 3296 | qemu_sem_destroy(&ms->postcopy_qemufile_src_sem); |
ab105cc1 | 3297 | error_free(ms->error); |
b91bf5e4 MAL |
3298 | } |
3299 | ||
e5cb7e76 PX |
3300 | static void migration_instance_init(Object *obj) |
3301 | { | |
3302 | MigrationState *ms = MIGRATION_OBJ(obj); | |
3303 | ||
3304 | ms->state = MIGRATION_STATUS_NONE; | |
e5cb7e76 | 3305 | ms->mbps = -1; |
aecbfe9c | 3306 | ms->pages_per_second = -1; |
e91d8951 | 3307 | qemu_sem_init(&ms->pause_sem, 0); |
87db1a7d | 3308 | qemu_mutex_init(&ms->error_mutex); |
8b0b29dc | 3309 | |
61a174e2 | 3310 | migrate_params_init(&ms->parameters); |
b23c2ade PX |
3311 | |
3312 | qemu_sem_init(&ms->postcopy_pause_sem, 0); | |
14b1742e | 3313 | qemu_sem_init(&ms->postcopy_pause_rp_sem, 0); |
edd090c7 | 3314 | qemu_sem_init(&ms->rp_state.rp_sem, 0); |
b28fb582 | 3315 | qemu_sem_init(&ms->rp_state.rp_pong_acks, 0); |
ad767bed | 3316 | qemu_sem_init(&ms->rate_limit_sem, 0); |
c7e0acd5 | 3317 | qemu_sem_init(&ms->wait_unplug_sem, 0); |
d0edb8a1 | 3318 | qemu_sem_init(&ms->postcopy_qemufile_src_sem, 0); |
62df066f | 3319 | qemu_mutex_init(&ms->qemu_file_lock); |
8b0b29dc PX |
3320 | } |
3321 | ||
3322 | /* | |
3323 | * Return true if check pass, false otherwise. Error will be put | |
3324 | * inside errp if provided. | |
3325 | */ | |
3326 | static bool migration_object_check(MigrationState *ms, Error **errp) | |
3327 | { | |
6b19a7d9 | 3328 | /* Assuming all off */ |
b02c7fc9 | 3329 | bool old_caps[MIGRATION_CAPABILITY__MAX] = { 0 }; |
6b19a7d9 | 3330 | |
8b0b29dc PX |
3331 | if (!migrate_params_check(&ms->parameters, errp)) { |
3332 | return false; | |
3333 | } | |
3334 | ||
b02c7fc9 | 3335 | return migrate_caps_check(old_caps, ms->capabilities, errp); |
e5cb7e76 PX |
3336 | } |
3337 | ||
3338 | static const TypeInfo migration_type = { | |
3339 | .name = TYPE_MIGRATION, | |
01f6e14c | 3340 | /* |
c8d3ff38 | 3341 | * NOTE: TYPE_MIGRATION is not really a device, as the object is |
2194abd6 | 3342 | * not created using qdev_new(), it is not attached to the qdev |
c8d3ff38 PX |
3343 | * device tree, and it is never realized. |
3344 | * | |
3345 | * TODO: Make this TYPE_OBJECT once QOM provides something like | |
3346 | * TYPE_DEVICE's "-global" properties. | |
01f6e14c | 3347 | */ |
e5cb7e76 PX |
3348 | .parent = TYPE_DEVICE, |
3349 | .class_init = migration_class_init, | |
3350 | .class_size = sizeof(MigrationClass), | |
3351 | .instance_size = sizeof(MigrationState), | |
3352 | .instance_init = migration_instance_init, | |
b91bf5e4 | 3353 | .instance_finalize = migration_instance_finalize, |
e5cb7e76 PX |
3354 | }; |
3355 | ||
3356 | static void register_migration_types(void) | |
3357 | { | |
3358 | type_register_static(&migration_type); | |
3359 | } | |
3360 | ||
3361 | type_init(register_migration_types); |