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Commit | Line | Data |
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a672b469 AL |
1 | /* |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
76cc7b58 JQ |
5 | * Copyright (c) 2009-2015 Red Hat Inc |
6 | * | |
7 | * Authors: | |
8 | * Juan Quintela <quintela@redhat.com> | |
a672b469 AL |
9 | * |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
26 | * THE SOFTWARE. | |
27 | */ | |
a672b469 | 28 | |
1393a485 | 29 | #include "qemu/osdep.h" |
abfd9ce3 | 30 | #include "hw/boards.h" |
1422e32d | 31 | #include "net/net.h" |
6666c96a | 32 | #include "migration.h" |
5e22479a | 33 | #include "migration/snapshot.h" |
d6454270 | 34 | #include "migration/vmstate.h" |
f8d806c9 | 35 | #include "migration/misc.h" |
f2a8f0a6 | 36 | #include "migration/register.h" |
84a899de | 37 | #include "migration/global_state.h" |
7b1e1a22 | 38 | #include "ram.h" |
40014d81 | 39 | #include "qemu-file-channel.h" |
08a0aee1 | 40 | #include "qemu-file.h" |
20a519a0 | 41 | #include "savevm.h" |
be07b0ac | 42 | #include "postcopy-ram.h" |
e688df6b | 43 | #include "qapi/error.h" |
112ed241 | 44 | #include "qapi/qapi-commands-migration.h" |
3ddba9a9 | 45 | #include "qapi/qmp/json-writer.h" |
f1a9fcdd DB |
46 | #include "qapi/clone-visitor.h" |
47 | #include "qapi/qapi-builtin-visit.h" | |
cc7a8ea7 | 48 | #include "qapi/qmp/qerror.h" |
d49b6836 | 49 | #include "qemu/error-report.h" |
9c17d615 | 50 | #include "sysemu/cpus.h" |
022c62cb | 51 | #include "exec/memory.h" |
51180423 | 52 | #include "exec/target_page.h" |
517a13c9 | 53 | #include "trace.h" |
28085f7b | 54 | #include "qemu/iov.h" |
db725815 | 55 | #include "qemu/main-loop.h" |
de08c606 | 56 | #include "block/snapshot.h" |
f348b6d1 | 57 | #include "qemu/cutils.h" |
61b67d47 | 58 | #include "io/channel-buffer.h" |
8925839f | 59 | #include "io/channel-file.h" |
377b21cc | 60 | #include "sysemu/replay.h" |
54d31236 | 61 | #include "sysemu/runstate.h" |
46517dd4 | 62 | #include "sysemu/sysemu.h" |
da278d58 | 63 | #include "sysemu/xen.h" |
aad555c2 | 64 | #include "migration/colo.h" |
6cafc8e4 | 65 | #include "qemu/bitmap.h" |
7659505c | 66 | #include "net/announce.h" |
b5eea99e | 67 | #include "qemu/yank.h" |
39675fff | 68 | #include "yank_functions.h" |
18995b98 | 69 | |
49324e93 | 70 | const unsigned int postcopy_ram_discard_version; |
093e3c42 | 71 | |
20a519a0 JQ |
72 | /* Subcommands for QEMU_VM_COMMAND */ |
73 | enum qemu_vm_cmd { | |
74 | MIG_CMD_INVALID = 0, /* Must be 0 */ | |
75 | MIG_CMD_OPEN_RETURN_PATH, /* Tell the dest to open the Return path */ | |
76 | MIG_CMD_PING, /* Request a PONG on the RP */ | |
77 | ||
78 | MIG_CMD_POSTCOPY_ADVISE, /* Prior to any page transfers, just | |
79 | warn we might want to do PC */ | |
80 | MIG_CMD_POSTCOPY_LISTEN, /* Start listening for incoming | |
81 | pages as it's running. */ | |
82 | MIG_CMD_POSTCOPY_RUN, /* Start execution */ | |
83 | ||
84 | MIG_CMD_POSTCOPY_RAM_DISCARD, /* A list of pages to discard that | |
85 | were previously sent during | |
86 | precopy but are dirty. */ | |
87 | MIG_CMD_PACKAGED, /* Send a wrapped stream within this stream */ | |
aad555c2 | 88 | MIG_CMD_ENABLE_COLO, /* Enable COLO */ |
858b6d62 | 89 | MIG_CMD_POSTCOPY_RESUME, /* resume postcopy on dest */ |
f25d4225 | 90 | MIG_CMD_RECV_BITMAP, /* Request for recved bitmap on dst */ |
20a519a0 JQ |
91 | MIG_CMD_MAX |
92 | }; | |
93 | ||
ee555cdf | 94 | #define MAX_VM_CMD_PACKAGED_SIZE UINT32_MAX |
c76ca188 DDAG |
95 | static struct mig_cmd_args { |
96 | ssize_t len; /* -1 = variable */ | |
97 | const char *name; | |
98 | } mig_cmd_args[] = { | |
99 | [MIG_CMD_INVALID] = { .len = -1, .name = "INVALID" }, | |
2e37701e DDAG |
100 | [MIG_CMD_OPEN_RETURN_PATH] = { .len = 0, .name = "OPEN_RETURN_PATH" }, |
101 | [MIG_CMD_PING] = { .len = sizeof(uint32_t), .name = "PING" }, | |
58110f0a | 102 | [MIG_CMD_POSTCOPY_ADVISE] = { .len = -1, .name = "POSTCOPY_ADVISE" }, |
093e3c42 DDAG |
103 | [MIG_CMD_POSTCOPY_LISTEN] = { .len = 0, .name = "POSTCOPY_LISTEN" }, |
104 | [MIG_CMD_POSTCOPY_RUN] = { .len = 0, .name = "POSTCOPY_RUN" }, | |
105 | [MIG_CMD_POSTCOPY_RAM_DISCARD] = { | |
106 | .len = -1, .name = "POSTCOPY_RAM_DISCARD" }, | |
3f5875ec | 107 | [MIG_CMD_POSTCOPY_RESUME] = { .len = 0, .name = "POSTCOPY_RESUME" }, |
11cf1d98 | 108 | [MIG_CMD_PACKAGED] = { .len = 4, .name = "PACKAGED" }, |
f25d4225 | 109 | [MIG_CMD_RECV_BITMAP] = { .len = -1, .name = "RECV_BITMAP" }, |
c76ca188 DDAG |
110 | [MIG_CMD_MAX] = { .len = -1, .name = "MAX" }, |
111 | }; | |
112 | ||
58110f0a VSO |
113 | /* Note for MIG_CMD_POSTCOPY_ADVISE: |
114 | * The format of arguments is depending on postcopy mode: | |
115 | * - postcopy RAM only | |
116 | * uint64_t host page size | |
117 | * uint64_t taget page size | |
118 | * | |
119 | * - postcopy RAM and postcopy dirty bitmaps | |
120 | * format is the same as for postcopy RAM only | |
121 | * | |
122 | * - postcopy dirty bitmaps only | |
123 | * Nothing. Command length field is 0. | |
124 | * | |
125 | * Be careful: adding a new postcopy entity with some other parameters should | |
126 | * not break format self-description ability. Good way is to introduce some | |
127 | * generic extendable format with an exception for two old entities. | |
128 | */ | |
129 | ||
a672b469 AL |
130 | /***********************************************************/ |
131 | /* savevm/loadvm support */ | |
132 | ||
05fcc848 | 133 | static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt, |
3d661c8a | 134 | int64_t pos, Error **errp) |
05fcc848 KW |
135 | { |
136 | int ret; | |
137 | QEMUIOVector qiov; | |
138 | ||
139 | qemu_iovec_init_external(&qiov, iov, iovcnt); | |
140 | ret = bdrv_writev_vmstate(opaque, &qiov, pos); | |
141 | if (ret < 0) { | |
142 | return ret; | |
143 | } | |
144 | ||
145 | return qiov.size; | |
146 | } | |
147 | ||
a202a4c0 | 148 | static ssize_t block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, |
3d661c8a | 149 | size_t size, Error **errp) |
a672b469 | 150 | { |
45566e9c | 151 | return bdrv_load_vmstate(opaque, buf, pos, size); |
a672b469 AL |
152 | } |
153 | ||
3d661c8a | 154 | static int bdrv_fclose(void *opaque, Error **errp) |
a672b469 | 155 | { |
ad492c92 | 156 | return bdrv_flush(opaque); |
a672b469 AL |
157 | } |
158 | ||
9229bf3c PB |
159 | static const QEMUFileOps bdrv_read_ops = { |
160 | .get_buffer = block_get_buffer, | |
161 | .close = bdrv_fclose | |
162 | }; | |
163 | ||
164 | static const QEMUFileOps bdrv_write_ops = { | |
05fcc848 KW |
165 | .writev_buffer = block_writev_buffer, |
166 | .close = bdrv_fclose | |
9229bf3c PB |
167 | }; |
168 | ||
45566e9c | 169 | static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable) |
a672b469 | 170 | { |
38ff78d3 | 171 | if (is_writable) { |
c6ad5be7 | 172 | return qemu_fopen_ops(bs, &bdrv_write_ops, false); |
38ff78d3 | 173 | } |
c6ad5be7 | 174 | return qemu_fopen_ops(bs, &bdrv_read_ops, false); |
a672b469 AL |
175 | } |
176 | ||
2ff68d07 | 177 | |
bb1a6d8c EH |
178 | /* QEMUFile timer support. |
179 | * Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c | |
180 | */ | |
2ff68d07 | 181 | |
40daca54 | 182 | void timer_put(QEMUFile *f, QEMUTimer *ts) |
2ff68d07 PB |
183 | { |
184 | uint64_t expire_time; | |
185 | ||
e93379b0 | 186 | expire_time = timer_expire_time_ns(ts); |
2ff68d07 PB |
187 | qemu_put_be64(f, expire_time); |
188 | } | |
189 | ||
40daca54 | 190 | void timer_get(QEMUFile *f, QEMUTimer *ts) |
2ff68d07 PB |
191 | { |
192 | uint64_t expire_time; | |
193 | ||
194 | expire_time = qemu_get_be64(f); | |
195 | if (expire_time != -1) { | |
bc72ad67 | 196 | timer_mod_ns(ts, expire_time); |
2ff68d07 | 197 | } else { |
bc72ad67 | 198 | timer_del(ts); |
2ff68d07 PB |
199 | } |
200 | } | |
201 | ||
202 | ||
bb1a6d8c EH |
203 | /* VMState timer support. |
204 | * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c | |
205 | */ | |
dde0463b | 206 | |
03fee66f MAL |
207 | static int get_timer(QEMUFile *f, void *pv, size_t size, |
208 | const VMStateField *field) | |
dde0463b JQ |
209 | { |
210 | QEMUTimer *v = pv; | |
40daca54 | 211 | timer_get(f, v); |
dde0463b JQ |
212 | return 0; |
213 | } | |
214 | ||
03fee66f | 215 | static int put_timer(QEMUFile *f, void *pv, size_t size, |
3ddba9a9 | 216 | const VMStateField *field, JSONWriter *vmdesc) |
dde0463b | 217 | { |
84e2e3eb | 218 | QEMUTimer *v = pv; |
40daca54 | 219 | timer_put(f, v); |
2c21ee76 JD |
220 | |
221 | return 0; | |
dde0463b JQ |
222 | } |
223 | ||
224 | const VMStateInfo vmstate_info_timer = { | |
225 | .name = "timer", | |
226 | .get = get_timer, | |
227 | .put = put_timer, | |
228 | }; | |
229 | ||
08e99e29 | 230 | |
7685ee6a AW |
231 | typedef struct CompatEntry { |
232 | char idstr[256]; | |
233 | int instance_id; | |
234 | } CompatEntry; | |
235 | ||
a672b469 | 236 | typedef struct SaveStateEntry { |
72cf2d4f | 237 | QTAILQ_ENTRY(SaveStateEntry) entry; |
a672b469 | 238 | char idstr[256]; |
93062e23 | 239 | uint32_t instance_id; |
4d2ffa08 | 240 | int alias_id; |
a672b469 | 241 | int version_id; |
0f42f657 JQ |
242 | /* version id read from the stream */ |
243 | int load_version_id; | |
a672b469 | 244 | int section_id; |
0f42f657 JQ |
245 | /* section id read from the stream */ |
246 | int load_section_id; | |
de22ded0 | 247 | const SaveVMHandlers *ops; |
9ed7d6ae | 248 | const VMStateDescription *vmsd; |
a672b469 | 249 | void *opaque; |
7685ee6a | 250 | CompatEntry *compat; |
a7ae8355 | 251 | int is_ram; |
a672b469 AL |
252 | } SaveStateEntry; |
253 | ||
0163a2e0 JQ |
254 | typedef struct SaveState { |
255 | QTAILQ_HEAD(, SaveStateEntry) handlers; | |
174723ff | 256 | SaveStateEntry *handler_pri_head[MIG_PRI_MAX + 1]; |
0163a2e0 | 257 | int global_section_id; |
61964c23 JQ |
258 | uint32_t len; |
259 | const char *name; | |
59811a32 | 260 | uint32_t target_page_bits; |
6cafc8e4 YK |
261 | uint32_t caps_count; |
262 | MigrationCapability *capabilities; | |
b9d68df6 | 263 | QemuUUID uuid; |
0163a2e0 JQ |
264 | } SaveState; |
265 | ||
266 | static SaveState savevm_state = { | |
267 | .handlers = QTAILQ_HEAD_INITIALIZER(savevm_state.handlers), | |
174723ff | 268 | .handler_pri_head = { [MIG_PRI_DEFAULT ... MIG_PRI_MAX] = NULL }, |
0163a2e0 | 269 | .global_section_id = 0, |
61964c23 JQ |
270 | }; |
271 | ||
6cafc8e4 YK |
272 | static bool should_validate_capability(int capability) |
273 | { | |
274 | assert(capability >= 0 && capability < MIGRATION_CAPABILITY__MAX); | |
275 | /* Validate only new capabilities to keep compatibility. */ | |
276 | switch (capability) { | |
277 | case MIGRATION_CAPABILITY_X_IGNORE_SHARED: | |
278 | return true; | |
279 | default: | |
280 | return false; | |
281 | } | |
282 | } | |
283 | ||
284 | static uint32_t get_validatable_capabilities_count(void) | |
285 | { | |
286 | MigrationState *s = migrate_get_current(); | |
287 | uint32_t result = 0; | |
288 | int i; | |
289 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { | |
290 | if (should_validate_capability(i) && s->enabled_capabilities[i]) { | |
291 | result++; | |
292 | } | |
293 | } | |
294 | return result; | |
295 | } | |
296 | ||
44b1ff31 | 297 | static int configuration_pre_save(void *opaque) |
61964c23 JQ |
298 | { |
299 | SaveState *state = opaque; | |
300 | const char *current_name = MACHINE_GET_CLASS(current_machine)->name; | |
6cafc8e4 YK |
301 | MigrationState *s = migrate_get_current(); |
302 | int i, j; | |
61964c23 JQ |
303 | |
304 | state->len = strlen(current_name); | |
305 | state->name = current_name; | |
46d702b1 | 306 | state->target_page_bits = qemu_target_page_bits(); |
44b1ff31 | 307 | |
6cafc8e4 YK |
308 | state->caps_count = get_validatable_capabilities_count(); |
309 | state->capabilities = g_renew(MigrationCapability, state->capabilities, | |
310 | state->caps_count); | |
311 | for (i = j = 0; i < MIGRATION_CAPABILITY__MAX; i++) { | |
312 | if (should_validate_capability(i) && s->enabled_capabilities[i]) { | |
313 | state->capabilities[j++] = i; | |
314 | } | |
315 | } | |
b9d68df6 | 316 | state->uuid = qemu_uuid; |
6cafc8e4 | 317 | |
44b1ff31 | 318 | return 0; |
59811a32 PM |
319 | } |
320 | ||
39f633d4 JG |
321 | static int configuration_post_save(void *opaque) |
322 | { | |
323 | SaveState *state = opaque; | |
324 | ||
325 | g_free(state->capabilities); | |
326 | state->capabilities = NULL; | |
327 | state->caps_count = 0; | |
328 | return 0; | |
329 | } | |
330 | ||
59811a32 PM |
331 | static int configuration_pre_load(void *opaque) |
332 | { | |
333 | SaveState *state = opaque; | |
334 | ||
335 | /* If there is no target-page-bits subsection it means the source | |
336 | * predates the variable-target-page-bits support and is using the | |
337 | * minimum possible value for this CPU. | |
338 | */ | |
46d702b1 | 339 | state->target_page_bits = qemu_target_page_bits_min(); |
59811a32 | 340 | return 0; |
61964c23 JQ |
341 | } |
342 | ||
6cafc8e4 YK |
343 | static bool configuration_validate_capabilities(SaveState *state) |
344 | { | |
345 | bool ret = true; | |
346 | MigrationState *s = migrate_get_current(); | |
347 | unsigned long *source_caps_bm; | |
348 | int i; | |
349 | ||
350 | source_caps_bm = bitmap_new(MIGRATION_CAPABILITY__MAX); | |
351 | for (i = 0; i < state->caps_count; i++) { | |
352 | MigrationCapability capability = state->capabilities[i]; | |
353 | set_bit(capability, source_caps_bm); | |
354 | } | |
355 | ||
356 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { | |
357 | bool source_state, target_state; | |
358 | if (!should_validate_capability(i)) { | |
359 | continue; | |
360 | } | |
361 | source_state = test_bit(i, source_caps_bm); | |
362 | target_state = s->enabled_capabilities[i]; | |
363 | if (source_state != target_state) { | |
364 | error_report("Capability %s is %s, but received capability is %s", | |
365 | MigrationCapability_str(i), | |
366 | target_state ? "on" : "off", | |
367 | source_state ? "on" : "off"); | |
368 | ret = false; | |
369 | /* Don't break here to report all failed capabilities */ | |
370 | } | |
371 | } | |
372 | ||
373 | g_free(source_caps_bm); | |
374 | return ret; | |
375 | } | |
376 | ||
61964c23 JQ |
377 | static int configuration_post_load(void *opaque, int version_id) |
378 | { | |
379 | SaveState *state = opaque; | |
380 | const char *current_name = MACHINE_GET_CLASS(current_machine)->name; | |
39f633d4 | 381 | int ret = 0; |
61964c23 JQ |
382 | |
383 | if (strncmp(state->name, current_name, state->len) != 0) { | |
15d61692 GK |
384 | error_report("Machine type received is '%.*s' and local is '%s'", |
385 | (int) state->len, state->name, current_name); | |
39f633d4 JG |
386 | ret = -EINVAL; |
387 | goto out; | |
61964c23 | 388 | } |
59811a32 | 389 | |
46d702b1 | 390 | if (state->target_page_bits != qemu_target_page_bits()) { |
59811a32 | 391 | error_report("Received TARGET_PAGE_BITS is %d but local is %d", |
46d702b1 | 392 | state->target_page_bits, qemu_target_page_bits()); |
39f633d4 JG |
393 | ret = -EINVAL; |
394 | goto out; | |
59811a32 PM |
395 | } |
396 | ||
6cafc8e4 | 397 | if (!configuration_validate_capabilities(state)) { |
39f633d4 JG |
398 | ret = -EINVAL; |
399 | goto out; | |
6cafc8e4 YK |
400 | } |
401 | ||
39f633d4 JG |
402 | out: |
403 | g_free((void *)state->name); | |
404 | state->name = NULL; | |
405 | state->len = 0; | |
406 | g_free(state->capabilities); | |
407 | state->capabilities = NULL; | |
408 | state->caps_count = 0; | |
409 | ||
410 | return ret; | |
61964c23 JQ |
411 | } |
412 | ||
6cafc8e4 YK |
413 | static int get_capability(QEMUFile *f, void *pv, size_t size, |
414 | const VMStateField *field) | |
415 | { | |
416 | MigrationCapability *capability = pv; | |
417 | char capability_str[UINT8_MAX + 1]; | |
418 | uint8_t len; | |
419 | int i; | |
420 | ||
421 | len = qemu_get_byte(f); | |
422 | qemu_get_buffer(f, (uint8_t *)capability_str, len); | |
423 | capability_str[len] = '\0'; | |
424 | for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) { | |
425 | if (!strcmp(MigrationCapability_str(i), capability_str)) { | |
426 | *capability = i; | |
427 | return 0; | |
428 | } | |
429 | } | |
430 | error_report("Received unknown capability %s", capability_str); | |
431 | return -EINVAL; | |
432 | } | |
433 | ||
434 | static int put_capability(QEMUFile *f, void *pv, size_t size, | |
3ddba9a9 | 435 | const VMStateField *field, JSONWriter *vmdesc) |
6cafc8e4 YK |
436 | { |
437 | MigrationCapability *capability = pv; | |
438 | const char *capability_str = MigrationCapability_str(*capability); | |
439 | size_t len = strlen(capability_str); | |
440 | assert(len <= UINT8_MAX); | |
441 | ||
442 | qemu_put_byte(f, len); | |
443 | qemu_put_buffer(f, (uint8_t *)capability_str, len); | |
444 | return 0; | |
445 | } | |
446 | ||
447 | static const VMStateInfo vmstate_info_capability = { | |
448 | .name = "capability", | |
449 | .get = get_capability, | |
450 | .put = put_capability, | |
451 | }; | |
452 | ||
59811a32 PM |
453 | /* The target-page-bits subsection is present only if the |
454 | * target page size is not the same as the default (ie the | |
455 | * minimum page size for a variable-page-size guest CPU). | |
456 | * If it is present then it contains the actual target page | |
457 | * bits for the machine, and migration will fail if the | |
458 | * two ends don't agree about it. | |
459 | */ | |
460 | static bool vmstate_target_page_bits_needed(void *opaque) | |
461 | { | |
46d702b1 JQ |
462 | return qemu_target_page_bits() |
463 | > qemu_target_page_bits_min(); | |
59811a32 PM |
464 | } |
465 | ||
466 | static const VMStateDescription vmstate_target_page_bits = { | |
467 | .name = "configuration/target-page-bits", | |
468 | .version_id = 1, | |
469 | .minimum_version_id = 1, | |
470 | .needed = vmstate_target_page_bits_needed, | |
471 | .fields = (VMStateField[]) { | |
472 | VMSTATE_UINT32(target_page_bits, SaveState), | |
473 | VMSTATE_END_OF_LIST() | |
474 | } | |
475 | }; | |
476 | ||
6cafc8e4 YK |
477 | static bool vmstate_capabilites_needed(void *opaque) |
478 | { | |
479 | return get_validatable_capabilities_count() > 0; | |
480 | } | |
481 | ||
482 | static const VMStateDescription vmstate_capabilites = { | |
483 | .name = "configuration/capabilities", | |
484 | .version_id = 1, | |
485 | .minimum_version_id = 1, | |
486 | .needed = vmstate_capabilites_needed, | |
487 | .fields = (VMStateField[]) { | |
488 | VMSTATE_UINT32_V(caps_count, SaveState, 1), | |
489 | VMSTATE_VARRAY_UINT32_ALLOC(capabilities, SaveState, caps_count, 1, | |
490 | vmstate_info_capability, | |
491 | MigrationCapability), | |
492 | VMSTATE_END_OF_LIST() | |
493 | } | |
494 | }; | |
495 | ||
b9d68df6 YK |
496 | static bool vmstate_uuid_needed(void *opaque) |
497 | { | |
498 | return qemu_uuid_set && migrate_validate_uuid(); | |
499 | } | |
500 | ||
501 | static int vmstate_uuid_post_load(void *opaque, int version_id) | |
502 | { | |
503 | SaveState *state = opaque; | |
504 | char uuid_src[UUID_FMT_LEN + 1]; | |
505 | char uuid_dst[UUID_FMT_LEN + 1]; | |
506 | ||
507 | if (!qemu_uuid_set) { | |
508 | /* | |
509 | * It's warning because user might not know UUID in some cases, | |
510 | * e.g. load an old snapshot | |
511 | */ | |
512 | qemu_uuid_unparse(&state->uuid, uuid_src); | |
513 | warn_report("UUID is received %s, but local uuid isn't set", | |
514 | uuid_src); | |
515 | return 0; | |
516 | } | |
517 | if (!qemu_uuid_is_equal(&state->uuid, &qemu_uuid)) { | |
518 | qemu_uuid_unparse(&state->uuid, uuid_src); | |
519 | qemu_uuid_unparse(&qemu_uuid, uuid_dst); | |
520 | error_report("UUID received is %s and local is %s", uuid_src, uuid_dst); | |
521 | return -EINVAL; | |
522 | } | |
523 | return 0; | |
524 | } | |
525 | ||
526 | static const VMStateDescription vmstate_uuid = { | |
527 | .name = "configuration/uuid", | |
528 | .version_id = 1, | |
529 | .minimum_version_id = 1, | |
530 | .needed = vmstate_uuid_needed, | |
531 | .post_load = vmstate_uuid_post_load, | |
532 | .fields = (VMStateField[]) { | |
533 | VMSTATE_UINT8_ARRAY_V(uuid.data, SaveState, sizeof(QemuUUID), 1), | |
534 | VMSTATE_END_OF_LIST() | |
535 | } | |
536 | }; | |
537 | ||
61964c23 JQ |
538 | static const VMStateDescription vmstate_configuration = { |
539 | .name = "configuration", | |
540 | .version_id = 1, | |
59811a32 | 541 | .pre_load = configuration_pre_load, |
61964c23 JQ |
542 | .post_load = configuration_post_load, |
543 | .pre_save = configuration_pre_save, | |
39f633d4 | 544 | .post_save = configuration_post_save, |
61964c23 JQ |
545 | .fields = (VMStateField[]) { |
546 | VMSTATE_UINT32(len, SaveState), | |
59046ec2 | 547 | VMSTATE_VBUFFER_ALLOC_UINT32(name, SaveState, 0, NULL, len), |
61964c23 JQ |
548 | VMSTATE_END_OF_LIST() |
549 | }, | |
395cb450 | 550 | .subsections = (const VMStateDescription *[]) { |
59811a32 | 551 | &vmstate_target_page_bits, |
6cafc8e4 | 552 | &vmstate_capabilites, |
b9d68df6 | 553 | &vmstate_uuid, |
59811a32 PM |
554 | NULL |
555 | } | |
0163a2e0 | 556 | }; |
a672b469 | 557 | |
abfd9ce3 AS |
558 | static void dump_vmstate_vmsd(FILE *out_file, |
559 | const VMStateDescription *vmsd, int indent, | |
560 | bool is_subsection); | |
561 | ||
562 | static void dump_vmstate_vmsf(FILE *out_file, const VMStateField *field, | |
563 | int indent) | |
564 | { | |
565 | fprintf(out_file, "%*s{\n", indent, ""); | |
566 | indent += 2; | |
567 | fprintf(out_file, "%*s\"field\": \"%s\",\n", indent, "", field->name); | |
568 | fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", | |
569 | field->version_id); | |
570 | fprintf(out_file, "%*s\"field_exists\": %s,\n", indent, "", | |
571 | field->field_exists ? "true" : "false"); | |
572 | fprintf(out_file, "%*s\"size\": %zu", indent, "", field->size); | |
573 | if (field->vmsd != NULL) { | |
574 | fprintf(out_file, ",\n"); | |
575 | dump_vmstate_vmsd(out_file, field->vmsd, indent, false); | |
576 | } | |
577 | fprintf(out_file, "\n%*s}", indent - 2, ""); | |
578 | } | |
579 | ||
580 | static void dump_vmstate_vmss(FILE *out_file, | |
5cd8cada | 581 | const VMStateDescription **subsection, |
abfd9ce3 AS |
582 | int indent) |
583 | { | |
5cd8cada JQ |
584 | if (*subsection != NULL) { |
585 | dump_vmstate_vmsd(out_file, *subsection, indent, true); | |
abfd9ce3 AS |
586 | } |
587 | } | |
588 | ||
589 | static void dump_vmstate_vmsd(FILE *out_file, | |
590 | const VMStateDescription *vmsd, int indent, | |
591 | bool is_subsection) | |
592 | { | |
593 | if (is_subsection) { | |
594 | fprintf(out_file, "%*s{\n", indent, ""); | |
595 | } else { | |
596 | fprintf(out_file, "%*s\"%s\": {\n", indent, "", "Description"); | |
597 | } | |
598 | indent += 2; | |
599 | fprintf(out_file, "%*s\"name\": \"%s\",\n", indent, "", vmsd->name); | |
600 | fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", | |
601 | vmsd->version_id); | |
602 | fprintf(out_file, "%*s\"minimum_version_id\": %d", indent, "", | |
603 | vmsd->minimum_version_id); | |
604 | if (vmsd->fields != NULL) { | |
605 | const VMStateField *field = vmsd->fields; | |
606 | bool first; | |
607 | ||
608 | fprintf(out_file, ",\n%*s\"Fields\": [\n", indent, ""); | |
609 | first = true; | |
610 | while (field->name != NULL) { | |
611 | if (field->flags & VMS_MUST_EXIST) { | |
612 | /* Ignore VMSTATE_VALIDATE bits; these don't get migrated */ | |
613 | field++; | |
614 | continue; | |
615 | } | |
616 | if (!first) { | |
617 | fprintf(out_file, ",\n"); | |
618 | } | |
619 | dump_vmstate_vmsf(out_file, field, indent + 2); | |
620 | field++; | |
621 | first = false; | |
622 | } | |
623 | fprintf(out_file, "\n%*s]", indent, ""); | |
624 | } | |
625 | if (vmsd->subsections != NULL) { | |
5cd8cada | 626 | const VMStateDescription **subsection = vmsd->subsections; |
abfd9ce3 AS |
627 | bool first; |
628 | ||
629 | fprintf(out_file, ",\n%*s\"Subsections\": [\n", indent, ""); | |
630 | first = true; | |
5cd8cada | 631 | while (*subsection != NULL) { |
abfd9ce3 AS |
632 | if (!first) { |
633 | fprintf(out_file, ",\n"); | |
634 | } | |
635 | dump_vmstate_vmss(out_file, subsection, indent + 2); | |
636 | subsection++; | |
637 | first = false; | |
638 | } | |
639 | fprintf(out_file, "\n%*s]", indent, ""); | |
640 | } | |
641 | fprintf(out_file, "\n%*s}", indent - 2, ""); | |
642 | } | |
643 | ||
644 | static void dump_machine_type(FILE *out_file) | |
645 | { | |
646 | MachineClass *mc; | |
647 | ||
648 | mc = MACHINE_GET_CLASS(current_machine); | |
649 | ||
650 | fprintf(out_file, " \"vmschkmachine\": {\n"); | |
651 | fprintf(out_file, " \"Name\": \"%s\"\n", mc->name); | |
652 | fprintf(out_file, " },\n"); | |
653 | } | |
654 | ||
655 | void dump_vmstate_json_to_file(FILE *out_file) | |
656 | { | |
657 | GSList *list, *elt; | |
658 | bool first; | |
659 | ||
660 | fprintf(out_file, "{\n"); | |
661 | dump_machine_type(out_file); | |
662 | ||
663 | first = true; | |
664 | list = object_class_get_list(TYPE_DEVICE, true); | |
665 | for (elt = list; elt; elt = elt->next) { | |
666 | DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data, | |
667 | TYPE_DEVICE); | |
668 | const char *name; | |
669 | int indent = 2; | |
670 | ||
671 | if (!dc->vmsd) { | |
672 | continue; | |
673 | } | |
674 | ||
675 | if (!first) { | |
676 | fprintf(out_file, ",\n"); | |
677 | } | |
678 | name = object_class_get_name(OBJECT_CLASS(dc)); | |
679 | fprintf(out_file, "%*s\"%s\": {\n", indent, "", name); | |
680 | indent += 2; | |
681 | fprintf(out_file, "%*s\"Name\": \"%s\",\n", indent, "", name); | |
682 | fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", | |
683 | dc->vmsd->version_id); | |
684 | fprintf(out_file, "%*s\"minimum_version_id\": %d,\n", indent, "", | |
685 | dc->vmsd->minimum_version_id); | |
686 | ||
687 | dump_vmstate_vmsd(out_file, dc->vmsd, indent, false); | |
688 | ||
689 | fprintf(out_file, "\n%*s}", indent - 2, ""); | |
690 | first = false; | |
691 | } | |
692 | fprintf(out_file, "\n}\n"); | |
693 | fclose(out_file); | |
26daeba4 | 694 | g_slist_free(list); |
abfd9ce3 AS |
695 | } |
696 | ||
93062e23 | 697 | static uint32_t calculate_new_instance_id(const char *idstr) |
8718e999 JQ |
698 | { |
699 | SaveStateEntry *se; | |
93062e23 | 700 | uint32_t instance_id = 0; |
8718e999 | 701 | |
0163a2e0 | 702 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
8718e999 JQ |
703 | if (strcmp(idstr, se->idstr) == 0 |
704 | && instance_id <= se->instance_id) { | |
705 | instance_id = se->instance_id + 1; | |
706 | } | |
707 | } | |
93062e23 PX |
708 | /* Make sure we never loop over without being noticed */ |
709 | assert(instance_id != VMSTATE_INSTANCE_ID_ANY); | |
8718e999 JQ |
710 | return instance_id; |
711 | } | |
712 | ||
7685ee6a AW |
713 | static int calculate_compat_instance_id(const char *idstr) |
714 | { | |
715 | SaveStateEntry *se; | |
716 | int instance_id = 0; | |
717 | ||
0163a2e0 | 718 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
38ff78d3 | 719 | if (!se->compat) { |
7685ee6a | 720 | continue; |
38ff78d3 | 721 | } |
7685ee6a AW |
722 | |
723 | if (strcmp(idstr, se->compat->idstr) == 0 | |
724 | && instance_id <= se->compat->instance_id) { | |
725 | instance_id = se->compat->instance_id + 1; | |
726 | } | |
727 | } | |
728 | return instance_id; | |
729 | } | |
730 | ||
f37bc036 PX |
731 | static inline MigrationPriority save_state_priority(SaveStateEntry *se) |
732 | { | |
733 | if (se->vmsd) { | |
734 | return se->vmsd->priority; | |
735 | } | |
736 | return MIG_PRI_DEFAULT; | |
737 | } | |
738 | ||
739 | static void savevm_state_handler_insert(SaveStateEntry *nse) | |
740 | { | |
741 | MigrationPriority priority = save_state_priority(nse); | |
742 | SaveStateEntry *se; | |
174723ff | 743 | int i; |
f37bc036 PX |
744 | |
745 | assert(priority <= MIG_PRI_MAX); | |
746 | ||
174723ff SC |
747 | for (i = priority - 1; i >= 0; i--) { |
748 | se = savevm_state.handler_pri_head[i]; | |
749 | if (se != NULL) { | |
750 | assert(save_state_priority(se) < priority); | |
f37bc036 PX |
751 | break; |
752 | } | |
753 | } | |
754 | ||
174723ff | 755 | if (i >= 0) { |
f37bc036 PX |
756 | QTAILQ_INSERT_BEFORE(se, nse, entry); |
757 | } else { | |
758 | QTAILQ_INSERT_TAIL(&savevm_state.handlers, nse, entry); | |
759 | } | |
174723ff SC |
760 | |
761 | if (savevm_state.handler_pri_head[priority] == NULL) { | |
762 | savevm_state.handler_pri_head[priority] = nse; | |
763 | } | |
f37bc036 PX |
764 | } |
765 | ||
bd5de61e SC |
766 | static void savevm_state_handler_remove(SaveStateEntry *se) |
767 | { | |
174723ff SC |
768 | SaveStateEntry *next; |
769 | MigrationPriority priority = save_state_priority(se); | |
770 | ||
771 | if (se == savevm_state.handler_pri_head[priority]) { | |
772 | next = QTAILQ_NEXT(se, entry); | |
773 | if (next != NULL && save_state_priority(next) == priority) { | |
774 | savevm_state.handler_pri_head[priority] = next; | |
775 | } else { | |
776 | savevm_state.handler_pri_head[priority] = NULL; | |
777 | } | |
778 | } | |
bd5de61e SC |
779 | QTAILQ_REMOVE(&savevm_state.handlers, se, entry); |
780 | } | |
781 | ||
a672b469 AL |
782 | /* TODO: Individual devices generally have very little idea about the rest |
783 | of the system, so instance_id should be removed/replaced. | |
784 | Meanwhile pass -1 as instance_id if you do not already have a clearly | |
785 | distinguishing id for all instances of your device class. */ | |
ce62df53 | 786 | int register_savevm_live(const char *idstr, |
93062e23 | 787 | uint32_t instance_id, |
a672b469 | 788 | int version_id, |
de22ded0 | 789 | const SaveVMHandlers *ops, |
a672b469 AL |
790 | void *opaque) |
791 | { | |
8718e999 | 792 | SaveStateEntry *se; |
a672b469 | 793 | |
97f3ad35 | 794 | se = g_new0(SaveStateEntry, 1); |
a672b469 | 795 | se->version_id = version_id; |
0163a2e0 | 796 | se->section_id = savevm_state.global_section_id++; |
7908c78d | 797 | se->ops = ops; |
a672b469 | 798 | se->opaque = opaque; |
9ed7d6ae | 799 | se->vmsd = NULL; |
a7ae8355 | 800 | /* if this is a live_savem then set is_ram */ |
9907e842 | 801 | if (ops->save_setup != NULL) { |
a7ae8355 SS |
802 | se->is_ram = 1; |
803 | } | |
a672b469 | 804 | |
7685ee6a AW |
805 | pstrcat(se->idstr, sizeof(se->idstr), idstr); |
806 | ||
1df2c9a2 | 807 | if (instance_id == VMSTATE_INSTANCE_ID_ANY) { |
7685ee6a | 808 | se->instance_id = calculate_new_instance_id(se->idstr); |
8718e999 JQ |
809 | } else { |
810 | se->instance_id = instance_id; | |
a672b469 | 811 | } |
7685ee6a | 812 | assert(!se->compat || se->instance_id == 0); |
f37bc036 | 813 | savevm_state_handler_insert(se); |
a672b469 AL |
814 | return 0; |
815 | } | |
816 | ||
3cad405b | 817 | void unregister_savevm(VMStateIf *obj, const char *idstr, void *opaque) |
41bd13af | 818 | { |
8718e999 | 819 | SaveStateEntry *se, *new_se; |
7685ee6a AW |
820 | char id[256] = ""; |
821 | ||
3cad405b MAL |
822 | if (obj) { |
823 | char *oid = vmstate_if_get_id(obj); | |
824 | if (oid) { | |
825 | pstrcpy(id, sizeof(id), oid); | |
7685ee6a | 826 | pstrcat(id, sizeof(id), "/"); |
3cad405b | 827 | g_free(oid); |
7685ee6a AW |
828 | } |
829 | } | |
830 | pstrcat(id, sizeof(id), idstr); | |
41bd13af | 831 | |
0163a2e0 | 832 | QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { |
7685ee6a | 833 | if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) { |
bd5de61e | 834 | savevm_state_handler_remove(se); |
ef1e1e07 | 835 | g_free(se->compat); |
7267c094 | 836 | g_free(se); |
41bd13af | 837 | } |
41bd13af AL |
838 | } |
839 | } | |
840 | ||
93062e23 | 841 | int vmstate_register_with_alias_id(VMStateIf *obj, uint32_t instance_id, |
4d2ffa08 JK |
842 | const VMStateDescription *vmsd, |
843 | void *opaque, int alias_id, | |
bc5c4f21 DDAG |
844 | int required_for_version, |
845 | Error **errp) | |
9ed7d6ae | 846 | { |
8718e999 | 847 | SaveStateEntry *se; |
9ed7d6ae | 848 | |
4d2ffa08 JK |
849 | /* If this triggers, alias support can be dropped for the vmsd. */ |
850 | assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id); | |
851 | ||
97f3ad35 | 852 | se = g_new0(SaveStateEntry, 1); |
9ed7d6ae | 853 | se->version_id = vmsd->version_id; |
0163a2e0 | 854 | se->section_id = savevm_state.global_section_id++; |
9ed7d6ae JQ |
855 | se->opaque = opaque; |
856 | se->vmsd = vmsd; | |
4d2ffa08 | 857 | se->alias_id = alias_id; |
9ed7d6ae | 858 | |
3cad405b MAL |
859 | if (obj) { |
860 | char *id = vmstate_if_get_id(obj); | |
7685ee6a | 861 | if (id) { |
581f08ba DDAG |
862 | if (snprintf(se->idstr, sizeof(se->idstr), "%s/", id) >= |
863 | sizeof(se->idstr)) { | |
864 | error_setg(errp, "Path too long for VMState (%s)", id); | |
865 | g_free(id); | |
866 | g_free(se); | |
867 | ||
868 | return -1; | |
869 | } | |
128e4e10 | 870 | g_free(id); |
7685ee6a | 871 | |
97f3ad35 | 872 | se->compat = g_new0(CompatEntry, 1); |
7685ee6a | 873 | pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name); |
1df2c9a2 | 874 | se->compat->instance_id = instance_id == VMSTATE_INSTANCE_ID_ANY ? |
7685ee6a | 875 | calculate_compat_instance_id(vmsd->name) : instance_id; |
1df2c9a2 | 876 | instance_id = VMSTATE_INSTANCE_ID_ANY; |
7685ee6a AW |
877 | } |
878 | } | |
879 | pstrcat(se->idstr, sizeof(se->idstr), vmsd->name); | |
880 | ||
1df2c9a2 | 881 | if (instance_id == VMSTATE_INSTANCE_ID_ANY) { |
7685ee6a | 882 | se->instance_id = calculate_new_instance_id(se->idstr); |
8718e999 JQ |
883 | } else { |
884 | se->instance_id = instance_id; | |
9ed7d6ae | 885 | } |
7685ee6a | 886 | assert(!se->compat || se->instance_id == 0); |
f37bc036 | 887 | savevm_state_handler_insert(se); |
9ed7d6ae JQ |
888 | return 0; |
889 | } | |
890 | ||
3cad405b | 891 | void vmstate_unregister(VMStateIf *obj, const VMStateDescription *vmsd, |
0be71e32 | 892 | void *opaque) |
9ed7d6ae | 893 | { |
1eb7538b JQ |
894 | SaveStateEntry *se, *new_se; |
895 | ||
0163a2e0 | 896 | QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { |
1eb7538b | 897 | if (se->vmsd == vmsd && se->opaque == opaque) { |
bd5de61e | 898 | savevm_state_handler_remove(se); |
ef1e1e07 | 899 | g_free(se->compat); |
7267c094 | 900 | g_free(se); |
1eb7538b JQ |
901 | } |
902 | } | |
9ed7d6ae JQ |
903 | } |
904 | ||
3a011c26 | 905 | static int vmstate_load(QEMUFile *f, SaveStateEntry *se) |
4082be4d | 906 | { |
9013dca5 | 907 | trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); |
9ed7d6ae | 908 | if (!se->vmsd) { /* Old style */ |
3a011c26 | 909 | return se->ops->load_state(f, se->opaque, se->load_version_id); |
9ed7d6ae | 910 | } |
3a011c26 | 911 | return vmstate_load_state(f, se->vmsd, se->opaque, se->load_version_id); |
4082be4d JQ |
912 | } |
913 | ||
3ddba9a9 MA |
914 | static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se, |
915 | JSONWriter *vmdesc) | |
8118f095 AG |
916 | { |
917 | int64_t old_offset, size; | |
918 | ||
919 | old_offset = qemu_ftell_fast(f); | |
920 | se->ops->save_state(f, se->opaque); | |
921 | size = qemu_ftell_fast(f) - old_offset; | |
922 | ||
923 | if (vmdesc) { | |
3ddba9a9 MA |
924 | json_writer_int64(vmdesc, "size", size); |
925 | json_writer_start_array(vmdesc, "fields"); | |
926 | json_writer_start_object(vmdesc, NULL); | |
927 | json_writer_str(vmdesc, "name", "data"); | |
928 | json_writer_int64(vmdesc, "size", size); | |
929 | json_writer_str(vmdesc, "type", "buffer"); | |
930 | json_writer_end_object(vmdesc); | |
931 | json_writer_end_array(vmdesc); | |
8118f095 AG |
932 | } |
933 | } | |
934 | ||
3ddba9a9 MA |
935 | static int vmstate_save(QEMUFile *f, SaveStateEntry *se, |
936 | JSONWriter *vmdesc) | |
4082be4d | 937 | { |
9013dca5 | 938 | trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); |
8118f095 AG |
939 | if (!se->vmsd) { |
940 | vmstate_save_old_style(f, se, vmdesc); | |
687433f6 | 941 | return 0; |
9ed7d6ae | 942 | } |
687433f6 | 943 | return vmstate_save_state(f, se->vmsd, se->opaque, vmdesc); |
4082be4d JQ |
944 | } |
945 | ||
ce39bfc9 DDAG |
946 | /* |
947 | * Write the header for device section (QEMU_VM_SECTION START/END/PART/FULL) | |
948 | */ | |
949 | static void save_section_header(QEMUFile *f, SaveStateEntry *se, | |
950 | uint8_t section_type) | |
951 | { | |
952 | qemu_put_byte(f, section_type); | |
953 | qemu_put_be32(f, se->section_id); | |
954 | ||
955 | if (section_type == QEMU_VM_SECTION_FULL || | |
956 | section_type == QEMU_VM_SECTION_START) { | |
957 | /* ID string */ | |
958 | size_t len = strlen(se->idstr); | |
959 | qemu_put_byte(f, len); | |
960 | qemu_put_buffer(f, (uint8_t *)se->idstr, len); | |
961 | ||
962 | qemu_put_be32(f, se->instance_id); | |
963 | qemu_put_be32(f, se->version_id); | |
964 | } | |
965 | } | |
966 | ||
f68945d4 DDAG |
967 | /* |
968 | * Write a footer onto device sections that catches cases misformatted device | |
969 | * sections. | |
970 | */ | |
971 | static void save_section_footer(QEMUFile *f, SaveStateEntry *se) | |
972 | { | |
15c38503 | 973 | if (migrate_get_current()->send_section_footer) { |
f68945d4 DDAG |
974 | qemu_put_byte(f, QEMU_VM_SECTION_FOOTER); |
975 | qemu_put_be32(f, se->section_id); | |
976 | } | |
977 | } | |
978 | ||
c76ca188 DDAG |
979 | /** |
980 | * qemu_savevm_command_send: Send a 'QEMU_VM_COMMAND' type element with the | |
981 | * command and associated data. | |
982 | * | |
983 | * @f: File to send command on | |
984 | * @command: Command type to send | |
985 | * @len: Length of associated data | |
986 | * @data: Data associated with command. | |
987 | */ | |
20a519a0 JQ |
988 | static void qemu_savevm_command_send(QEMUFile *f, |
989 | enum qemu_vm_cmd command, | |
990 | uint16_t len, | |
991 | uint8_t *data) | |
c76ca188 DDAG |
992 | { |
993 | trace_savevm_command_send(command, len); | |
994 | qemu_put_byte(f, QEMU_VM_COMMAND); | |
995 | qemu_put_be16(f, (uint16_t)command); | |
996 | qemu_put_be16(f, len); | |
997 | qemu_put_buffer(f, data, len); | |
998 | qemu_fflush(f); | |
999 | } | |
1000 | ||
aad555c2 ZC |
1001 | void qemu_savevm_send_colo_enable(QEMUFile *f) |
1002 | { | |
1003 | trace_savevm_send_colo_enable(); | |
1004 | qemu_savevm_command_send(f, MIG_CMD_ENABLE_COLO, 0, NULL); | |
1005 | } | |
1006 | ||
2e37701e DDAG |
1007 | void qemu_savevm_send_ping(QEMUFile *f, uint32_t value) |
1008 | { | |
1009 | uint32_t buf; | |
1010 | ||
1011 | trace_savevm_send_ping(value); | |
1012 | buf = cpu_to_be32(value); | |
1013 | qemu_savevm_command_send(f, MIG_CMD_PING, sizeof(value), (uint8_t *)&buf); | |
1014 | } | |
1015 | ||
1016 | void qemu_savevm_send_open_return_path(QEMUFile *f) | |
1017 | { | |
1018 | trace_savevm_send_open_return_path(); | |
1019 | qemu_savevm_command_send(f, MIG_CMD_OPEN_RETURN_PATH, 0, NULL); | |
1020 | } | |
1021 | ||
11cf1d98 DDAG |
1022 | /* We have a buffer of data to send; we don't want that all to be loaded |
1023 | * by the command itself, so the command contains just the length of the | |
1024 | * extra buffer that we then send straight after it. | |
1025 | * TODO: Must be a better way to organise that | |
1026 | * | |
1027 | * Returns: | |
1028 | * 0 on success | |
1029 | * -ve on error | |
1030 | */ | |
61b67d47 | 1031 | int qemu_savevm_send_packaged(QEMUFile *f, const uint8_t *buf, size_t len) |
11cf1d98 | 1032 | { |
11cf1d98 DDAG |
1033 | uint32_t tmp; |
1034 | ||
1035 | if (len > MAX_VM_CMD_PACKAGED_SIZE) { | |
1036 | error_report("%s: Unreasonably large packaged state: %zu", | |
1037 | __func__, len); | |
1038 | return -1; | |
1039 | } | |
1040 | ||
1041 | tmp = cpu_to_be32(len); | |
1042 | ||
1043 | trace_qemu_savevm_send_packaged(); | |
1044 | qemu_savevm_command_send(f, MIG_CMD_PACKAGED, 4, (uint8_t *)&tmp); | |
1045 | ||
61b67d47 | 1046 | qemu_put_buffer(f, buf, len); |
11cf1d98 DDAG |
1047 | |
1048 | return 0; | |
1049 | } | |
1050 | ||
093e3c42 DDAG |
1051 | /* Send prior to any postcopy transfer */ |
1052 | void qemu_savevm_send_postcopy_advise(QEMUFile *f) | |
1053 | { | |
58110f0a VSO |
1054 | if (migrate_postcopy_ram()) { |
1055 | uint64_t tmp[2]; | |
1056 | tmp[0] = cpu_to_be64(ram_pagesize_summary()); | |
1057 | tmp[1] = cpu_to_be64(qemu_target_page_size()); | |
1058 | ||
1059 | trace_qemu_savevm_send_postcopy_advise(); | |
1060 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_ADVISE, | |
1061 | 16, (uint8_t *)tmp); | |
1062 | } else { | |
1063 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_ADVISE, 0, NULL); | |
1064 | } | |
093e3c42 DDAG |
1065 | } |
1066 | ||
1067 | /* Sent prior to starting the destination running in postcopy, discard pages | |
1068 | * that have already been sent but redirtied on the source. | |
1069 | * CMD_POSTCOPY_RAM_DISCARD consist of: | |
1070 | * byte version (0) | |
1071 | * byte Length of name field (not including 0) | |
1072 | * n x byte RAM block name | |
1073 | * byte 0 terminator (just for safety) | |
1074 | * n x Byte ranges within the named RAMBlock | |
1075 | * be64 Start of the range | |
1076 | * be64 Length | |
1077 | * | |
1078 | * name: RAMBlock name that these entries are part of | |
1079 | * len: Number of page entries | |
1080 | * start_list: 'len' addresses | |
1081 | * length_list: 'len' addresses | |
1082 | * | |
1083 | */ | |
1084 | void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name, | |
1085 | uint16_t len, | |
1086 | uint64_t *start_list, | |
1087 | uint64_t *length_list) | |
1088 | { | |
1089 | uint8_t *buf; | |
1090 | uint16_t tmplen; | |
1091 | uint16_t t; | |
1092 | size_t name_len = strlen(name); | |
1093 | ||
1094 | trace_qemu_savevm_send_postcopy_ram_discard(name, len); | |
1095 | assert(name_len < 256); | |
1096 | buf = g_malloc0(1 + 1 + name_len + 1 + (8 + 8) * len); | |
1097 | buf[0] = postcopy_ram_discard_version; | |
1098 | buf[1] = name_len; | |
1099 | memcpy(buf + 2, name, name_len); | |
1100 | tmplen = 2 + name_len; | |
1101 | buf[tmplen++] = '\0'; | |
1102 | ||
1103 | for (t = 0; t < len; t++) { | |
4d885131 | 1104 | stq_be_p(buf + tmplen, start_list[t]); |
093e3c42 | 1105 | tmplen += 8; |
4d885131 | 1106 | stq_be_p(buf + tmplen, length_list[t]); |
093e3c42 DDAG |
1107 | tmplen += 8; |
1108 | } | |
1109 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RAM_DISCARD, tmplen, buf); | |
1110 | g_free(buf); | |
1111 | } | |
1112 | ||
1113 | /* Get the destination into a state where it can receive postcopy data. */ | |
1114 | void qemu_savevm_send_postcopy_listen(QEMUFile *f) | |
1115 | { | |
1116 | trace_savevm_send_postcopy_listen(); | |
1117 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_LISTEN, 0, NULL); | |
1118 | } | |
1119 | ||
1120 | /* Kick the destination into running */ | |
1121 | void qemu_savevm_send_postcopy_run(QEMUFile *f) | |
1122 | { | |
1123 | trace_savevm_send_postcopy_run(); | |
1124 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RUN, 0, NULL); | |
1125 | } | |
1126 | ||
3f5875ec PX |
1127 | void qemu_savevm_send_postcopy_resume(QEMUFile *f) |
1128 | { | |
1129 | trace_savevm_send_postcopy_resume(); | |
1130 | qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RESUME, 0, NULL); | |
1131 | } | |
1132 | ||
f25d4225 PX |
1133 | void qemu_savevm_send_recv_bitmap(QEMUFile *f, char *block_name) |
1134 | { | |
1135 | size_t len; | |
1136 | char buf[256]; | |
1137 | ||
1138 | trace_savevm_send_recv_bitmap(block_name); | |
1139 | ||
1140 | buf[0] = len = strlen(block_name); | |
1141 | memcpy(buf + 1, block_name, len); | |
1142 | ||
1143 | qemu_savevm_command_send(f, MIG_CMD_RECV_BITMAP, len + 1, (uint8_t *)buf); | |
1144 | } | |
1145 | ||
e1c37d0e | 1146 | bool qemu_savevm_state_blocked(Error **errp) |
dc912121 AW |
1147 | { |
1148 | SaveStateEntry *se; | |
1149 | ||
0163a2e0 | 1150 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
7d854c47 | 1151 | if (se->vmsd && se->vmsd->unmigratable) { |
f231b88d CR |
1152 | error_setg(errp, "State blocked by non-migratable device '%s'", |
1153 | se->idstr); | |
dc912121 AW |
1154 | return true; |
1155 | } | |
1156 | } | |
1157 | return false; | |
1158 | } | |
1159 | ||
3af8554b DDAG |
1160 | void qemu_savevm_non_migratable_list(strList **reasons) |
1161 | { | |
1162 | SaveStateEntry *se; | |
1163 | ||
1164 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { | |
1165 | if (se->vmsd && se->vmsd->unmigratable) { | |
1166 | QAPI_LIST_PREPEND(*reasons, | |
1167 | g_strdup_printf("non-migratable device: %s", | |
1168 | se->idstr)); | |
1169 | } | |
1170 | } | |
1171 | } | |
1172 | ||
f796baa1 DDAG |
1173 | void qemu_savevm_state_header(QEMUFile *f) |
1174 | { | |
1175 | trace_savevm_state_header(); | |
1176 | qemu_put_be32(f, QEMU_VM_FILE_MAGIC); | |
1177 | qemu_put_be32(f, QEMU_VM_FILE_VERSION); | |
172dfd4f | 1178 | |
4ffdb337 | 1179 | if (migrate_get_current()->send_configuration) { |
172dfd4f DDAG |
1180 | qemu_put_byte(f, QEMU_VM_CONFIGURATION); |
1181 | vmstate_save_state(f, &vmstate_configuration, &savevm_state, 0); | |
1182 | } | |
f796baa1 DDAG |
1183 | } |
1184 | ||
d05de9e3 | 1185 | bool qemu_savevm_state_guest_unplug_pending(void) |
c7e0acd5 JF |
1186 | { |
1187 | SaveStateEntry *se; | |
c7e0acd5 JF |
1188 | |
1189 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { | |
284f42a5 JF |
1190 | if (se->vmsd && se->vmsd->dev_unplug_pending && |
1191 | se->vmsd->dev_unplug_pending(se->opaque)) { | |
d05de9e3 | 1192 | return true; |
c7e0acd5 JF |
1193 | } |
1194 | } | |
1195 | ||
d05de9e3 | 1196 | return false; |
c7e0acd5 JF |
1197 | } |
1198 | ||
9907e842 | 1199 | void qemu_savevm_state_setup(QEMUFile *f) |
a672b469 AL |
1200 | { |
1201 | SaveStateEntry *se; | |
bd227060 | 1202 | Error *local_err = NULL; |
39346385 | 1203 | int ret; |
a672b469 | 1204 | |
9907e842 | 1205 | trace_savevm_state_setup(); |
0163a2e0 | 1206 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
9907e842 | 1207 | if (!se->ops || !se->ops->save_setup) { |
a672b469 | 1208 | continue; |
22ea40f4 | 1209 | } |
cea3b4c0 | 1210 | if (se->ops->is_active) { |
6bd68781 JQ |
1211 | if (!se->ops->is_active(se->opaque)) { |
1212 | continue; | |
1213 | } | |
1214 | } | |
ce39bfc9 | 1215 | save_section_header(f, se, QEMU_VM_SECTION_START); |
a672b469 | 1216 | |
9907e842 | 1217 | ret = se->ops->save_setup(f, se->opaque); |
f68945d4 | 1218 | save_section_footer(f, se); |
2975725f | 1219 | if (ret < 0) { |
47c8c17a PB |
1220 | qemu_file_set_error(f, ret); |
1221 | break; | |
2975725f | 1222 | } |
a672b469 | 1223 | } |
bd227060 WW |
1224 | |
1225 | if (precopy_notify(PRECOPY_NOTIFY_SETUP, &local_err)) { | |
1226 | error_report_err(local_err); | |
1227 | } | |
a672b469 AL |
1228 | } |
1229 | ||
d1b8eadb PX |
1230 | int qemu_savevm_state_resume_prepare(MigrationState *s) |
1231 | { | |
1232 | SaveStateEntry *se; | |
1233 | int ret; | |
1234 | ||
1235 | trace_savevm_state_resume_prepare(); | |
1236 | ||
1237 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { | |
1238 | if (!se->ops || !se->ops->resume_prepare) { | |
1239 | continue; | |
1240 | } | |
cea3b4c0 | 1241 | if (se->ops->is_active) { |
d1b8eadb PX |
1242 | if (!se->ops->is_active(se->opaque)) { |
1243 | continue; | |
1244 | } | |
1245 | } | |
1246 | ret = se->ops->resume_prepare(s, se->opaque); | |
1247 | if (ret < 0) { | |
1248 | return ret; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | return 0; | |
1253 | } | |
1254 | ||
39346385 | 1255 | /* |
07f35073 | 1256 | * this function has three return values: |
39346385 JQ |
1257 | * negative: there was one error, and we have -errno. |
1258 | * 0 : We haven't finished, caller have to go again | |
1259 | * 1 : We have finished, we can go to complete phase | |
1260 | */ | |
35ecd943 | 1261 | int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy) |
a672b469 AL |
1262 | { |
1263 | SaveStateEntry *se; | |
1264 | int ret = 1; | |
1265 | ||
9013dca5 | 1266 | trace_savevm_state_iterate(); |
0163a2e0 | 1267 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
16310a3c | 1268 | if (!se->ops || !se->ops->save_live_iterate) { |
a672b469 | 1269 | continue; |
22ea40f4 | 1270 | } |
a94cd7b8 WY |
1271 | if (se->ops->is_active && |
1272 | !se->ops->is_active(se->opaque)) { | |
1273 | continue; | |
6bd68781 | 1274 | } |
a94cd7b8 WY |
1275 | if (se->ops->is_active_iterate && |
1276 | !se->ops->is_active_iterate(se->opaque)) { | |
1277 | continue; | |
c865d848 | 1278 | } |
35ecd943 DDAG |
1279 | /* |
1280 | * In the postcopy phase, any device that doesn't know how to | |
1281 | * do postcopy should have saved it's state in the _complete | |
1282 | * call that's already run, it might get confused if we call | |
1283 | * iterate afterwards. | |
1284 | */ | |
c6467627 VSO |
1285 | if (postcopy && |
1286 | !(se->ops->has_postcopy && se->ops->has_postcopy(se->opaque))) { | |
35ecd943 DDAG |
1287 | continue; |
1288 | } | |
aac844ed JQ |
1289 | if (qemu_file_rate_limit(f)) { |
1290 | return 0; | |
1291 | } | |
464400f6 | 1292 | trace_savevm_section_start(se->idstr, se->section_id); |
ce39bfc9 DDAG |
1293 | |
1294 | save_section_header(f, se, QEMU_VM_SECTION_PART); | |
a672b469 | 1295 | |
16310a3c | 1296 | ret = se->ops->save_live_iterate(f, se->opaque); |
a5df2a02 | 1297 | trace_savevm_section_end(se->idstr, se->section_id, ret); |
f68945d4 | 1298 | save_section_footer(f, se); |
517a13c9 | 1299 | |
47c8c17a | 1300 | if (ret < 0) { |
4991f309 WY |
1301 | error_report("failed to save SaveStateEntry with id(name): %d(%s)", |
1302 | se->section_id, se->idstr); | |
47c8c17a PB |
1303 | qemu_file_set_error(f, ret); |
1304 | } | |
2975725f | 1305 | if (ret <= 0) { |
90697be8 JK |
1306 | /* Do not proceed to the next vmstate before this one reported |
1307 | completion of the current stage. This serializes the migration | |
1308 | and reduces the probability that a faster changing state is | |
1309 | synchronized over and over again. */ | |
1310 | break; | |
1311 | } | |
a672b469 | 1312 | } |
39346385 | 1313 | return ret; |
a672b469 AL |
1314 | } |
1315 | ||
9850c604 AG |
1316 | static bool should_send_vmdesc(void) |
1317 | { | |
1318 | MachineState *machine = MACHINE(qdev_get_machine()); | |
5727309d | 1319 | bool in_postcopy = migration_in_postcopy(); |
8421b205 | 1320 | return !machine->suppress_vmdesc && !in_postcopy; |
9850c604 AG |
1321 | } |
1322 | ||
763c906b DDAG |
1323 | /* |
1324 | * Calls the save_live_complete_postcopy methods | |
1325 | * causing the last few pages to be sent immediately and doing any associated | |
1326 | * cleanup. | |
1327 | * Note postcopy also calls qemu_savevm_state_complete_precopy to complete | |
1328 | * all the other devices, but that happens at the point we switch to postcopy. | |
1329 | */ | |
1330 | void qemu_savevm_state_complete_postcopy(QEMUFile *f) | |
1331 | { | |
1332 | SaveStateEntry *se; | |
1333 | int ret; | |
1334 | ||
1335 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { | |
1336 | if (!se->ops || !se->ops->save_live_complete_postcopy) { | |
1337 | continue; | |
1338 | } | |
cea3b4c0 | 1339 | if (se->ops->is_active) { |
763c906b DDAG |
1340 | if (!se->ops->is_active(se->opaque)) { |
1341 | continue; | |
1342 | } | |
1343 | } | |
1344 | trace_savevm_section_start(se->idstr, se->section_id); | |
1345 | /* Section type */ | |
1346 | qemu_put_byte(f, QEMU_VM_SECTION_END); | |
1347 | qemu_put_be32(f, se->section_id); | |
1348 | ||
1349 | ret = se->ops->save_live_complete_postcopy(f, se->opaque); | |
1350 | trace_savevm_section_end(se->idstr, se->section_id, ret); | |
1351 | save_section_footer(f, se); | |
1352 | if (ret < 0) { | |
1353 | qemu_file_set_error(f, ret); | |
1354 | return; | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | qemu_put_byte(f, QEMU_VM_EOF); | |
1359 | qemu_fflush(f); | |
1360 | } | |
1361 | ||
622a80c9 | 1362 | static |
e326767b | 1363 | int qemu_savevm_state_complete_precopy_iterable(QEMUFile *f, bool in_postcopy) |
a672b469 AL |
1364 | { |
1365 | SaveStateEntry *se; | |
2975725f | 1366 | int ret; |
ea375f9a | 1367 | |
0163a2e0 | 1368 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
763c906b | 1369 | if (!se->ops || |
c6467627 VSO |
1370 | (in_postcopy && se->ops->has_postcopy && |
1371 | se->ops->has_postcopy(se->opaque)) || | |
763c906b | 1372 | !se->ops->save_live_complete_precopy) { |
a672b469 | 1373 | continue; |
22ea40f4 | 1374 | } |
1c0d249d | 1375 | |
cea3b4c0 | 1376 | if (se->ops->is_active) { |
6bd68781 JQ |
1377 | if (!se->ops->is_active(se->opaque)) { |
1378 | continue; | |
1379 | } | |
1380 | } | |
464400f6 | 1381 | trace_savevm_section_start(se->idstr, se->section_id); |
ce39bfc9 DDAG |
1382 | |
1383 | save_section_header(f, se, QEMU_VM_SECTION_END); | |
a672b469 | 1384 | |
a3e06c3d | 1385 | ret = se->ops->save_live_complete_precopy(f, se->opaque); |
a5df2a02 | 1386 | trace_savevm_section_end(se->idstr, se->section_id, ret); |
f68945d4 | 1387 | save_section_footer(f, se); |
2975725f | 1388 | if (ret < 0) { |
47c8c17a | 1389 | qemu_file_set_error(f, ret); |
a1fbe750 | 1390 | return -1; |
2975725f | 1391 | } |
a672b469 AL |
1392 | } |
1393 | ||
622a80c9 WY |
1394 | return 0; |
1395 | } | |
1396 | ||
622a80c9 WY |
1397 | int qemu_savevm_state_complete_precopy_non_iterable(QEMUFile *f, |
1398 | bool in_postcopy, | |
1399 | bool inactivate_disks) | |
1400 | { | |
3ddba9a9 | 1401 | g_autoptr(JSONWriter) vmdesc = NULL; |
622a80c9 WY |
1402 | int vmdesc_len; |
1403 | SaveStateEntry *se; | |
1404 | int ret; | |
1c0d249d | 1405 | |
3ddba9a9 MA |
1406 | vmdesc = json_writer_new(false); |
1407 | json_writer_start_object(vmdesc, NULL); | |
1408 | json_writer_int64(vmdesc, "page_size", qemu_target_page_size()); | |
1409 | json_writer_start_array(vmdesc, "devices"); | |
0163a2e0 | 1410 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
a672b469 | 1411 | |
22ea40f4 | 1412 | if ((!se->ops || !se->ops->save_state) && !se->vmsd) { |
5cecf414 | 1413 | continue; |
22ea40f4 | 1414 | } |
df896152 JQ |
1415 | if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { |
1416 | trace_savevm_section_skip(se->idstr, se->section_id); | |
1417 | continue; | |
1418 | } | |
1419 | ||
464400f6 | 1420 | trace_savevm_section_start(se->idstr, se->section_id); |
8118f095 | 1421 | |
3ddba9a9 MA |
1422 | json_writer_start_object(vmdesc, NULL); |
1423 | json_writer_str(vmdesc, "name", se->idstr); | |
1424 | json_writer_int64(vmdesc, "instance_id", se->instance_id); | |
8118f095 | 1425 | |
ce39bfc9 | 1426 | save_section_header(f, se, QEMU_VM_SECTION_FULL); |
687433f6 DDAG |
1427 | ret = vmstate_save(f, se, vmdesc); |
1428 | if (ret) { | |
1429 | qemu_file_set_error(f, ret); | |
1430 | return ret; | |
1431 | } | |
a5df2a02 | 1432 | trace_savevm_section_end(se->idstr, se->section_id, 0); |
f68945d4 | 1433 | save_section_footer(f, se); |
bdf46d64 | 1434 | |
3ddba9a9 | 1435 | json_writer_end_object(vmdesc); |
a672b469 AL |
1436 | } |
1437 | ||
a1fbe750 FZ |
1438 | if (inactivate_disks) { |
1439 | /* Inactivate before sending QEMU_VM_EOF so that the | |
1440 | * bdrv_invalidate_cache_all() on the other end won't fail. */ | |
1441 | ret = bdrv_inactivate_all(); | |
1442 | if (ret) { | |
c232bf58 DDAG |
1443 | error_report("%s: bdrv_inactivate_all() failed (%d)", |
1444 | __func__, ret); | |
a1fbe750 FZ |
1445 | qemu_file_set_error(f, ret); |
1446 | return ret; | |
1447 | } | |
1448 | } | |
763c906b DDAG |
1449 | if (!in_postcopy) { |
1450 | /* Postcopy stream will still be going */ | |
1451 | qemu_put_byte(f, QEMU_VM_EOF); | |
1452 | } | |
8118f095 | 1453 | |
3ddba9a9 MA |
1454 | json_writer_end_array(vmdesc); |
1455 | json_writer_end_object(vmdesc); | |
1456 | vmdesc_len = strlen(json_writer_get(vmdesc)); | |
8118f095 | 1457 | |
9850c604 AG |
1458 | if (should_send_vmdesc()) { |
1459 | qemu_put_byte(f, QEMU_VM_VMDESCRIPTION); | |
1460 | qemu_put_be32(f, vmdesc_len); | |
3ddba9a9 | 1461 | qemu_put_buffer(f, (uint8_t *)json_writer_get(vmdesc), vmdesc_len); |
9850c604 | 1462 | } |
8118f095 | 1463 | |
622a80c9 WY |
1464 | return 0; |
1465 | } | |
1466 | ||
1467 | int qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only, | |
1468 | bool inactivate_disks) | |
1469 | { | |
1470 | int ret; | |
1471 | Error *local_err = NULL; | |
1472 | bool in_postcopy = migration_in_postcopy(); | |
1473 | ||
1474 | if (precopy_notify(PRECOPY_NOTIFY_COMPLETE, &local_err)) { | |
1475 | error_report_err(local_err); | |
1476 | } | |
1477 | ||
1478 | trace_savevm_state_complete_precopy(); | |
1479 | ||
1480 | cpu_synchronize_all_states(); | |
1481 | ||
e326767b WY |
1482 | if (!in_postcopy || iterable_only) { |
1483 | ret = qemu_savevm_state_complete_precopy_iterable(f, in_postcopy); | |
1484 | if (ret) { | |
1485 | return ret; | |
1486 | } | |
622a80c9 WY |
1487 | } |
1488 | ||
1489 | if (iterable_only) { | |
1490 | goto flush; | |
1491 | } | |
1492 | ||
1493 | ret = qemu_savevm_state_complete_precopy_non_iterable(f, in_postcopy, | |
1494 | inactivate_disks); | |
1495 | if (ret) { | |
1496 | return ret; | |
1497 | } | |
1498 | ||
4e455d51 | 1499 | flush: |
edaae611 | 1500 | qemu_fflush(f); |
a1fbe750 | 1501 | return 0; |
a672b469 AL |
1502 | } |
1503 | ||
c31b098f DDAG |
1504 | /* Give an estimate of the amount left to be transferred, |
1505 | * the result is split into the amount for units that can and | |
1506 | * for units that can't do postcopy. | |
1507 | */ | |
faec066a | 1508 | void qemu_savevm_state_pending(QEMUFile *f, uint64_t threshold_size, |
47995026 VSO |
1509 | uint64_t *res_precopy_only, |
1510 | uint64_t *res_compatible, | |
1511 | uint64_t *res_postcopy_only) | |
e4ed1541 JQ |
1512 | { |
1513 | SaveStateEntry *se; | |
c31b098f | 1514 | |
47995026 VSO |
1515 | *res_precopy_only = 0; |
1516 | *res_compatible = 0; | |
1517 | *res_postcopy_only = 0; | |
c31b098f | 1518 | |
e4ed1541 | 1519 | |
0163a2e0 | 1520 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
e4ed1541 JQ |
1521 | if (!se->ops || !se->ops->save_live_pending) { |
1522 | continue; | |
1523 | } | |
cea3b4c0 | 1524 | if (se->ops->is_active) { |
e4ed1541 JQ |
1525 | if (!se->ops->is_active(se->opaque)) { |
1526 | continue; | |
1527 | } | |
1528 | } | |
faec066a | 1529 | se->ops->save_live_pending(f, se->opaque, threshold_size, |
47995026 VSO |
1530 | res_precopy_only, res_compatible, |
1531 | res_postcopy_only); | |
e4ed1541 | 1532 | } |
e4ed1541 JQ |
1533 | } |
1534 | ||
ea7415fa | 1535 | void qemu_savevm_state_cleanup(void) |
4ec7fcc7 JK |
1536 | { |
1537 | SaveStateEntry *se; | |
bd227060 WW |
1538 | Error *local_err = NULL; |
1539 | ||
1540 | if (precopy_notify(PRECOPY_NOTIFY_CLEANUP, &local_err)) { | |
1541 | error_report_err(local_err); | |
1542 | } | |
4ec7fcc7 | 1543 | |
ea7415fa | 1544 | trace_savevm_state_cleanup(); |
0163a2e0 | 1545 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
70f794fc JQ |
1546 | if (se->ops && se->ops->save_cleanup) { |
1547 | se->ops->save_cleanup(se->opaque); | |
4ec7fcc7 JK |
1548 | } |
1549 | } | |
1550 | } | |
1551 | ||
5d80448c | 1552 | static int qemu_savevm_state(QEMUFile *f, Error **errp) |
a672b469 | 1553 | { |
a672b469 | 1554 | int ret; |
3e0c8050 | 1555 | MigrationState *ms = migrate_get_current(); |
6dcf6668 | 1556 | MigrationStatus status; |
3e0c8050 | 1557 | |
392d87e2 | 1558 | if (migration_is_running(ms->state)) { |
3d63da16 JL |
1559 | error_setg(errp, QERR_MIGRATION_ACTIVE); |
1560 | return -EINVAL; | |
1561 | } | |
a672b469 | 1562 | |
ce7c817c JQ |
1563 | if (migrate_use_block()) { |
1564 | error_setg(errp, "Block migration and snapshots are incompatible"); | |
3d63da16 | 1565 | return -EINVAL; |
ce7c817c JQ |
1566 | } |
1567 | ||
3d63da16 | 1568 | migrate_init(ms); |
87f3bd87 | 1569 | memset(&ram_counters, 0, sizeof(ram_counters)); |
02abee3d | 1570 | memset(&compression_counters, 0, sizeof(compression_counters)); |
3d63da16 JL |
1571 | ms->to_dst_file = f; |
1572 | ||
9b095037 | 1573 | qemu_mutex_unlock_iothread(); |
f796baa1 | 1574 | qemu_savevm_state_header(f); |
9907e842 | 1575 | qemu_savevm_state_setup(f); |
9b095037 PB |
1576 | qemu_mutex_lock_iothread(); |
1577 | ||
47c8c17a | 1578 | while (qemu_file_get_error(f) == 0) { |
35ecd943 | 1579 | if (qemu_savevm_state_iterate(f, false) > 0) { |
47c8c17a PB |
1580 | break; |
1581 | } | |
1582 | } | |
a672b469 | 1583 | |
47c8c17a | 1584 | ret = qemu_file_get_error(f); |
39346385 | 1585 | if (ret == 0) { |
a1fbe750 | 1586 | qemu_savevm_state_complete_precopy(f, false, false); |
624b9cc2 | 1587 | ret = qemu_file_get_error(f); |
39346385 | 1588 | } |
15b3b8ea | 1589 | qemu_savevm_state_cleanup(); |
04943eba | 1590 | if (ret != 0) { |
5d80448c | 1591 | error_setg_errno(errp, -ret, "Error while writing VM state"); |
04943eba | 1592 | } |
6dcf6668 | 1593 | |
6dcf6668 DL |
1594 | if (ret != 0) { |
1595 | status = MIGRATION_STATUS_FAILED; | |
1596 | } else { | |
1597 | status = MIGRATION_STATUS_COMPLETED; | |
1598 | } | |
1599 | migrate_set_state(&ms->state, MIGRATION_STATUS_SETUP, status); | |
f9c8caa0 VSO |
1600 | |
1601 | /* f is outer parameter, it should not stay in global migration state after | |
1602 | * this function finished */ | |
1603 | ms->to_dst_file = NULL; | |
1604 | ||
a672b469 AL |
1605 | return ret; |
1606 | } | |
1607 | ||
3f6df99d | 1608 | void qemu_savevm_live_state(QEMUFile *f) |
a7ae8355 | 1609 | { |
3f6df99d ZC |
1610 | /* save QEMU_VM_SECTION_END section */ |
1611 | qemu_savevm_state_complete_precopy(f, true, false); | |
1612 | qemu_put_byte(f, QEMU_VM_EOF); | |
1613 | } | |
a7ae8355 | 1614 | |
3f6df99d ZC |
1615 | int qemu_save_device_state(QEMUFile *f) |
1616 | { | |
1617 | SaveStateEntry *se; | |
a7ae8355 | 1618 | |
3f6df99d ZC |
1619 | if (!migration_in_colo_state()) { |
1620 | qemu_put_be32(f, QEMU_VM_FILE_MAGIC); | |
1621 | qemu_put_be32(f, QEMU_VM_FILE_VERSION); | |
1622 | } | |
a7ae8355 SS |
1623 | cpu_synchronize_all_states(); |
1624 | ||
0163a2e0 | 1625 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
687433f6 DDAG |
1626 | int ret; |
1627 | ||
a7ae8355 SS |
1628 | if (se->is_ram) { |
1629 | continue; | |
1630 | } | |
22ea40f4 | 1631 | if ((!se->ops || !se->ops->save_state) && !se->vmsd) { |
a7ae8355 SS |
1632 | continue; |
1633 | } | |
df896152 JQ |
1634 | if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { |
1635 | continue; | |
1636 | } | |
a7ae8355 | 1637 | |
ce39bfc9 | 1638 | save_section_header(f, se, QEMU_VM_SECTION_FULL); |
a7ae8355 | 1639 | |
687433f6 DDAG |
1640 | ret = vmstate_save(f, se, NULL); |
1641 | if (ret) { | |
1642 | return ret; | |
1643 | } | |
f68945d4 DDAG |
1644 | |
1645 | save_section_footer(f, se); | |
a7ae8355 SS |
1646 | } |
1647 | ||
1648 | qemu_put_byte(f, QEMU_VM_EOF); | |
1649 | ||
1650 | return qemu_file_get_error(f); | |
1651 | } | |
1652 | ||
93062e23 | 1653 | static SaveStateEntry *find_se(const char *idstr, uint32_t instance_id) |
a672b469 AL |
1654 | { |
1655 | SaveStateEntry *se; | |
1656 | ||
0163a2e0 | 1657 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
a672b469 | 1658 | if (!strcmp(se->idstr, idstr) && |
4d2ffa08 JK |
1659 | (instance_id == se->instance_id || |
1660 | instance_id == se->alias_id)) | |
a672b469 | 1661 | return se; |
7685ee6a AW |
1662 | /* Migrating from an older version? */ |
1663 | if (strstr(se->idstr, idstr) && se->compat) { | |
1664 | if (!strcmp(se->compat->idstr, idstr) && | |
1665 | (instance_id == se->compat->instance_id || | |
1666 | instance_id == se->alias_id)) | |
1667 | return se; | |
1668 | } | |
a672b469 AL |
1669 | } |
1670 | return NULL; | |
1671 | } | |
1672 | ||
7b89bf27 DDAG |
1673 | enum LoadVMExitCodes { |
1674 | /* Allow a command to quit all layers of nested loadvm loops */ | |
1675 | LOADVM_QUIT = 1, | |
1676 | }; | |
1677 | ||
093e3c42 DDAG |
1678 | /* ------ incoming postcopy messages ------ */ |
1679 | /* 'advise' arrives before any transfers just to tell us that a postcopy | |
1680 | * *might* happen - it might be skipped if precopy transferred everything | |
1681 | * quickly. | |
1682 | */ | |
875fcd01 GK |
1683 | static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis, |
1684 | uint16_t len) | |
093e3c42 DDAG |
1685 | { |
1686 | PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_ADVISE); | |
e8ca1db2 | 1687 | uint64_t remote_pagesize_summary, local_pagesize_summary, remote_tps; |
144fa06b | 1688 | size_t page_size = qemu_target_page_size(); |
d3dff7a5 | 1689 | Error *local_err = NULL; |
093e3c42 DDAG |
1690 | |
1691 | trace_loadvm_postcopy_handle_advise(); | |
1692 | if (ps != POSTCOPY_INCOMING_NONE) { | |
1693 | error_report("CMD_POSTCOPY_ADVISE in wrong postcopy state (%d)", ps); | |
1694 | return -1; | |
1695 | } | |
1696 | ||
875fcd01 GK |
1697 | switch (len) { |
1698 | case 0: | |
1699 | if (migrate_postcopy_ram()) { | |
1700 | error_report("RAM postcopy is enabled but have 0 byte advise"); | |
1701 | return -EINVAL; | |
1702 | } | |
58110f0a | 1703 | return 0; |
875fcd01 GK |
1704 | case 8 + 8: |
1705 | if (!migrate_postcopy_ram()) { | |
1706 | error_report("RAM postcopy is disabled but have 16 byte advise"); | |
1707 | return -EINVAL; | |
1708 | } | |
1709 | break; | |
1710 | default: | |
1711 | error_report("CMD_POSTCOPY_ADVISE invalid length (%d)", len); | |
1712 | return -EINVAL; | |
58110f0a VSO |
1713 | } |
1714 | ||
d7651f15 | 1715 | if (!postcopy_ram_supported_by_host(mis)) { |
328d4d85 | 1716 | postcopy_state_set(POSTCOPY_INCOMING_NONE); |
eb59db53 DDAG |
1717 | return -1; |
1718 | } | |
1719 | ||
e8ca1db2 DDAG |
1720 | remote_pagesize_summary = qemu_get_be64(mis->from_src_file); |
1721 | local_pagesize_summary = ram_pagesize_summary(); | |
1722 | ||
1723 | if (remote_pagesize_summary != local_pagesize_summary) { | |
093e3c42 | 1724 | /* |
e8ca1db2 DDAG |
1725 | * This detects two potential causes of mismatch: |
1726 | * a) A mismatch in host page sizes | |
1727 | * Some combinations of mismatch are probably possible but it gets | |
1728 | * a bit more complicated. In particular we need to place whole | |
1729 | * host pages on the dest at once, and we need to ensure that we | |
1730 | * handle dirtying to make sure we never end up sending part of | |
1731 | * a hostpage on it's own. | |
1732 | * b) The use of different huge page sizes on source/destination | |
1733 | * a more fine grain test is performed during RAM block migration | |
1734 | * but this test here causes a nice early clear failure, and | |
1735 | * also fails when passed to an older qemu that doesn't | |
1736 | * do huge pages. | |
093e3c42 | 1737 | */ |
e8ca1db2 DDAG |
1738 | error_report("Postcopy needs matching RAM page sizes (s=%" PRIx64 |
1739 | " d=%" PRIx64 ")", | |
1740 | remote_pagesize_summary, local_pagesize_summary); | |
093e3c42 DDAG |
1741 | return -1; |
1742 | } | |
1743 | ||
1744 | remote_tps = qemu_get_be64(mis->from_src_file); | |
144fa06b | 1745 | if (remote_tps != page_size) { |
093e3c42 DDAG |
1746 | /* |
1747 | * Again, some differences could be dealt with, but for now keep it | |
1748 | * simple. | |
1749 | */ | |
20afaed9 | 1750 | error_report("Postcopy needs matching target page sizes (s=%d d=%zd)", |
144fa06b | 1751 | (int)remote_tps, page_size); |
093e3c42 DDAG |
1752 | return -1; |
1753 | } | |
1754 | ||
d3dff7a5 DDAG |
1755 | if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_ADVISE, &local_err)) { |
1756 | error_report_err(local_err); | |
1757 | return -1; | |
1758 | } | |
1759 | ||
1caddf8a DDAG |
1760 | if (ram_postcopy_incoming_init(mis)) { |
1761 | return -1; | |
1762 | } | |
1763 | ||
093e3c42 DDAG |
1764 | return 0; |
1765 | } | |
1766 | ||
1767 | /* After postcopy we will be told to throw some pages away since they're | |
1768 | * dirty and will have to be demand fetched. Must happen before CPU is | |
1769 | * started. | |
1770 | * There can be 0..many of these messages, each encoding multiple pages. | |
1771 | */ | |
1772 | static int loadvm_postcopy_ram_handle_discard(MigrationIncomingState *mis, | |
1773 | uint16_t len) | |
1774 | { | |
1775 | int tmp; | |
1776 | char ramid[256]; | |
1777 | PostcopyState ps = postcopy_state_get(); | |
1778 | ||
1779 | trace_loadvm_postcopy_ram_handle_discard(); | |
1780 | ||
1781 | switch (ps) { | |
1782 | case POSTCOPY_INCOMING_ADVISE: | |
1783 | /* 1st discard */ | |
f9527107 | 1784 | tmp = postcopy_ram_prepare_discard(mis); |
093e3c42 DDAG |
1785 | if (tmp) { |
1786 | return tmp; | |
1787 | } | |
1788 | break; | |
1789 | ||
1790 | case POSTCOPY_INCOMING_DISCARD: | |
1791 | /* Expected state */ | |
1792 | break; | |
1793 | ||
1794 | default: | |
1795 | error_report("CMD_POSTCOPY_RAM_DISCARD in wrong postcopy state (%d)", | |
1796 | ps); | |
1797 | return -1; | |
1798 | } | |
1799 | /* We're expecting a | |
1800 | * Version (0) | |
1801 | * a RAM ID string (length byte, name, 0 term) | |
1802 | * then at least 1 16 byte chunk | |
1803 | */ | |
1804 | if (len < (1 + 1 + 1 + 1 + 2 * 8)) { | |
1805 | error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); | |
1806 | return -1; | |
1807 | } | |
1808 | ||
1809 | tmp = qemu_get_byte(mis->from_src_file); | |
1810 | if (tmp != postcopy_ram_discard_version) { | |
1811 | error_report("CMD_POSTCOPY_RAM_DISCARD invalid version (%d)", tmp); | |
1812 | return -1; | |
1813 | } | |
1814 | ||
1815 | if (!qemu_get_counted_string(mis->from_src_file, ramid)) { | |
1816 | error_report("CMD_POSTCOPY_RAM_DISCARD Failed to read RAMBlock ID"); | |
1817 | return -1; | |
1818 | } | |
1819 | tmp = qemu_get_byte(mis->from_src_file); | |
1820 | if (tmp != 0) { | |
1821 | error_report("CMD_POSTCOPY_RAM_DISCARD missing nil (%d)", tmp); | |
1822 | return -1; | |
1823 | } | |
1824 | ||
1825 | len -= 3 + strlen(ramid); | |
1826 | if (len % 16) { | |
1827 | error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); | |
1828 | return -1; | |
1829 | } | |
1830 | trace_loadvm_postcopy_ram_handle_discard_header(ramid, len); | |
1831 | while (len) { | |
093e3c42 DDAG |
1832 | uint64_t start_addr, block_length; |
1833 | start_addr = qemu_get_be64(mis->from_src_file); | |
1834 | block_length = qemu_get_be64(mis->from_src_file); | |
1835 | ||
1836 | len -= 16; | |
aaa2064c | 1837 | int ret = ram_discard_range(ramid, start_addr, block_length); |
093e3c42 DDAG |
1838 | if (ret) { |
1839 | return ret; | |
1840 | } | |
093e3c42 DDAG |
1841 | } |
1842 | trace_loadvm_postcopy_ram_handle_discard_end(); | |
1843 | ||
1844 | return 0; | |
1845 | } | |
1846 | ||
c76201ab DDAG |
1847 | /* |
1848 | * Triggered by a postcopy_listen command; this thread takes over reading | |
1849 | * the input stream, leaving the main thread free to carry on loading the rest | |
1850 | * of the device state (from RAM). | |
1851 | * (TODO:This could do with being in a postcopy file - but there again it's | |
1852 | * just another input loop, not that postcopy specific) | |
1853 | */ | |
1854 | static void *postcopy_ram_listen_thread(void *opaque) | |
1855 | { | |
c76201ab | 1856 | MigrationIncomingState *mis = migration_incoming_get_current(); |
b411b844 | 1857 | QEMUFile *f = mis->from_src_file; |
c76201ab | 1858 | int load_res; |
ee647225 VSO |
1859 | MigrationState *migr = migrate_get_current(); |
1860 | ||
1861 | object_ref(OBJECT(migr)); | |
c76201ab | 1862 | |
6ba996bb DDAG |
1863 | migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, |
1864 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
c76201ab DDAG |
1865 | qemu_sem_post(&mis->listen_thread_sem); |
1866 | trace_postcopy_ram_listen_thread_start(); | |
1867 | ||
74637e6f | 1868 | rcu_register_thread(); |
c76201ab DDAG |
1869 | /* |
1870 | * Because we're a thread and not a coroutine we can't yield | |
1871 | * in qemu_file, and thus we must be blocking now. | |
1872 | */ | |
1873 | qemu_file_set_blocking(f, true); | |
1874 | load_res = qemu_loadvm_state_main(f, mis); | |
b411b844 PX |
1875 | |
1876 | /* | |
1877 | * This is tricky, but, mis->from_src_file can change after it | |
1878 | * returns, when postcopy recovery happened. In the future, we may | |
1879 | * want a wrapper for the QEMUFile handle. | |
1880 | */ | |
1881 | f = mis->from_src_file; | |
1882 | ||
c76201ab DDAG |
1883 | /* And non-blocking again so we don't block in any cleanup */ |
1884 | qemu_file_set_blocking(f, false); | |
1885 | ||
1886 | trace_postcopy_ram_listen_thread_exit(); | |
1887 | if (load_res < 0) { | |
c76201ab | 1888 | qemu_file_set_error(f, load_res); |
ee647225 VSO |
1889 | dirty_bitmap_mig_cancel_incoming(); |
1890 | if (postcopy_state_get() == POSTCOPY_INCOMING_RUNNING && | |
1891 | !migrate_postcopy_ram() && migrate_dirty_bitmaps()) | |
1892 | { | |
1893 | error_report("%s: loadvm failed during postcopy: %d. All states " | |
1894 | "are migrated except dirty bitmaps. Some dirty " | |
1895 | "bitmaps may be lost, and present migrated dirty " | |
1896 | "bitmaps are correctly migrated and valid.", | |
1897 | __func__, load_res); | |
1898 | load_res = 0; /* prevent further exit() */ | |
1899 | } else { | |
1900 | error_report("%s: loadvm failed: %d", __func__, load_res); | |
1901 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, | |
1902 | MIGRATION_STATUS_FAILED); | |
1903 | } | |
1904 | } | |
1905 | if (load_res >= 0) { | |
c76201ab DDAG |
1906 | /* |
1907 | * This looks good, but it's possible that the device loading in the | |
1908 | * main thread hasn't finished yet, and so we might not be in 'RUN' | |
1909 | * state yet; wait for the end of the main thread. | |
1910 | */ | |
1911 | qemu_event_wait(&mis->main_thread_load_event); | |
1912 | } | |
1913 | postcopy_ram_incoming_cleanup(mis); | |
c76201ab DDAG |
1914 | |
1915 | if (load_res < 0) { | |
1916 | /* | |
1917 | * If something went wrong then we have a bad state so exit; | |
1918 | * depending how far we got it might be possible at this point | |
1919 | * to leave the guest running and fire MCEs for pages that never | |
1920 | * arrived as a desperate recovery step. | |
1921 | */ | |
74637e6f | 1922 | rcu_unregister_thread(); |
c76201ab DDAG |
1923 | exit(EXIT_FAILURE); |
1924 | } | |
1925 | ||
6ba996bb DDAG |
1926 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
1927 | MIGRATION_STATUS_COMPLETED); | |
1928 | /* | |
1929 | * If everything has worked fine, then the main thread has waited | |
1930 | * for us to start, and we're the last use of the mis. | |
1931 | * (If something broke then qemu will have to exit anyway since it's | |
1932 | * got a bad migration state). | |
1933 | */ | |
1934 | migration_incoming_state_destroy(); | |
acb5ea86 | 1935 | qemu_loadvm_state_cleanup(); |
6ba996bb | 1936 | |
74637e6f | 1937 | rcu_unregister_thread(); |
9cf4bb87 | 1938 | mis->have_listen_thread = false; |
2d49bacd WY |
1939 | postcopy_state_set(POSTCOPY_INCOMING_END); |
1940 | ||
ee647225 VSO |
1941 | object_unref(OBJECT(migr)); |
1942 | ||
c76201ab DDAG |
1943 | return NULL; |
1944 | } | |
1945 | ||
093e3c42 DDAG |
1946 | /* After this message we must be able to immediately receive postcopy data */ |
1947 | static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis) | |
1948 | { | |
1949 | PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_LISTENING); | |
1950 | trace_loadvm_postcopy_handle_listen(); | |
6864a7b5 DDAG |
1951 | Error *local_err = NULL; |
1952 | ||
093e3c42 DDAG |
1953 | if (ps != POSTCOPY_INCOMING_ADVISE && ps != POSTCOPY_INCOMING_DISCARD) { |
1954 | error_report("CMD_POSTCOPY_LISTEN in wrong postcopy state (%d)", ps); | |
1955 | return -1; | |
1956 | } | |
f9527107 DDAG |
1957 | if (ps == POSTCOPY_INCOMING_ADVISE) { |
1958 | /* | |
1959 | * A rare case, we entered listen without having to do any discards, | |
1960 | * so do the setup that's normally done at the time of the 1st discard. | |
1961 | */ | |
58110f0a VSO |
1962 | if (migrate_postcopy_ram()) { |
1963 | postcopy_ram_prepare_discard(mis); | |
1964 | } | |
f9527107 | 1965 | } |
093e3c42 | 1966 | |
f0a227ad DDAG |
1967 | /* |
1968 | * Sensitise RAM - can now generate requests for blocks that don't exist | |
1969 | * However, at this point the CPU shouldn't be running, and the IO | |
1970 | * shouldn't be doing anything yet so don't actually expect requests | |
1971 | */ | |
58110f0a | 1972 | if (migrate_postcopy_ram()) { |
2a7eb148 | 1973 | if (postcopy_ram_incoming_setup(mis)) { |
91b02dc7 | 1974 | postcopy_ram_incoming_cleanup(mis); |
58110f0a VSO |
1975 | return -1; |
1976 | } | |
f0a227ad DDAG |
1977 | } |
1978 | ||
6864a7b5 DDAG |
1979 | if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_LISTEN, &local_err)) { |
1980 | error_report_err(local_err); | |
1981 | return -1; | |
1982 | } | |
1983 | ||
c76201ab DDAG |
1984 | mis->have_listen_thread = true; |
1985 | /* Start up the listening thread and wait for it to signal ready */ | |
1986 | qemu_sem_init(&mis->listen_thread_sem, 0); | |
1987 | qemu_thread_create(&mis->listen_thread, "postcopy/listen", | |
b411b844 | 1988 | postcopy_ram_listen_thread, NULL, |
a587a3fe | 1989 | QEMU_THREAD_DETACHED); |
c76201ab DDAG |
1990 | qemu_sem_wait(&mis->listen_thread_sem); |
1991 | qemu_sem_destroy(&mis->listen_thread_sem); | |
1992 | ||
093e3c42 DDAG |
1993 | return 0; |
1994 | } | |
1995 | ||
ea6a55bc | 1996 | static void loadvm_postcopy_handle_run_bh(void *opaque) |
093e3c42 | 1997 | { |
27c6825b | 1998 | Error *local_err = NULL; |
1ce54262 | 1999 | MigrationIncomingState *mis = opaque; |
093e3c42 | 2000 | |
27c6825b DDAG |
2001 | /* TODO we should move all of this lot into postcopy_ram.c or a shared code |
2002 | * in migration.c | |
2003 | */ | |
2004 | cpu_synchronize_all_post_init(); | |
2005 | ||
7659505c | 2006 | qemu_announce_self(&mis->announce_timer, migrate_announce_params()); |
27c6825b | 2007 | |
ace21a58 KW |
2008 | /* Make sure all file formats flush their mutable metadata. |
2009 | * If we get an error here, just don't restart the VM yet. */ | |
27c6825b | 2010 | bdrv_invalidate_cache_all(&local_err); |
0042fd36 | 2011 | if (local_err) { |
ace21a58 | 2012 | error_report_err(local_err); |
0042fd36 KW |
2013 | local_err = NULL; |
2014 | autostart = false; | |
2015 | } | |
2016 | ||
27c6825b | 2017 | trace_loadvm_postcopy_handle_run_cpu_sync(); |
27c6825b DDAG |
2018 | |
2019 | trace_loadvm_postcopy_handle_run_vmstart(); | |
2020 | ||
b35ebdf0 VSO |
2021 | dirty_bitmap_mig_before_vm_start(); |
2022 | ||
093e3c42 DDAG |
2023 | if (autostart) { |
2024 | /* Hold onto your hats, starting the CPU */ | |
2025 | vm_start(); | |
2026 | } else { | |
2027 | /* leave it paused and let management decide when to start the CPU */ | |
2028 | runstate_set(RUN_STATE_PAUSED); | |
2029 | } | |
2030 | ||
1ce54262 | 2031 | qemu_bh_delete(mis->bh); |
ea6a55bc DL |
2032 | } |
2033 | ||
2034 | /* After all discards we can start running and asking for pages */ | |
2035 | static int loadvm_postcopy_handle_run(MigrationIncomingState *mis) | |
2036 | { | |
0197d890 | 2037 | PostcopyState ps = postcopy_state_get(); |
ea6a55bc DL |
2038 | |
2039 | trace_loadvm_postcopy_handle_run(); | |
2040 | if (ps != POSTCOPY_INCOMING_LISTENING) { | |
2041 | error_report("CMD_POSTCOPY_RUN in wrong postcopy state (%d)", ps); | |
2042 | return -1; | |
2043 | } | |
2044 | ||
0197d890 | 2045 | postcopy_state_set(POSTCOPY_INCOMING_RUNNING); |
1ce54262 WY |
2046 | mis->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, mis); |
2047 | qemu_bh_schedule(mis->bh); | |
ea6a55bc | 2048 | |
27c6825b DDAG |
2049 | /* We need to finish reading the stream from the package |
2050 | * and also stop reading anything more from the stream that loaded the | |
2051 | * package (since it's now being read by the listener thread). | |
2052 | * LOADVM_QUIT will quit all the layers of nested loadvm loops. | |
2053 | */ | |
2054 | return LOADVM_QUIT; | |
093e3c42 DDAG |
2055 | } |
2056 | ||
0c26781c PX |
2057 | /* We must be with page_request_mutex held */ |
2058 | static gboolean postcopy_sync_page_req(gpointer key, gpointer value, | |
2059 | gpointer data) | |
2060 | { | |
2061 | MigrationIncomingState *mis = data; | |
2062 | void *host_addr = (void *) key; | |
2063 | ram_addr_t rb_offset; | |
2064 | RAMBlock *rb; | |
2065 | int ret; | |
2066 | ||
2067 | rb = qemu_ram_block_from_host(host_addr, true, &rb_offset); | |
2068 | if (!rb) { | |
2069 | /* | |
2070 | * This should _never_ happen. However be nice for a migrating VM to | |
2071 | * not crash/assert. Post an error (note: intended to not use *_once | |
2072 | * because we do want to see all the illegal addresses; and this can | |
2073 | * never be triggered by the guest so we're safe) and move on next. | |
2074 | */ | |
2075 | error_report("%s: illegal host addr %p", __func__, host_addr); | |
2076 | /* Try the next entry */ | |
2077 | return FALSE; | |
2078 | } | |
2079 | ||
2080 | ret = migrate_send_rp_message_req_pages(mis, rb, rb_offset); | |
2081 | if (ret) { | |
2082 | /* Please refer to above comment. */ | |
2083 | error_report("%s: send rp message failed for addr %p", | |
2084 | __func__, host_addr); | |
2085 | return FALSE; | |
2086 | } | |
2087 | ||
2088 | trace_postcopy_page_req_sync(host_addr); | |
2089 | ||
2090 | return FALSE; | |
2091 | } | |
2092 | ||
2093 | static void migrate_send_rp_req_pages_pending(MigrationIncomingState *mis) | |
2094 | { | |
2095 | WITH_QEMU_LOCK_GUARD(&mis->page_request_mutex) { | |
2096 | g_tree_foreach(mis->page_requested, postcopy_sync_page_req, mis); | |
2097 | } | |
2098 | } | |
2099 | ||
3f5875ec PX |
2100 | static int loadvm_postcopy_handle_resume(MigrationIncomingState *mis) |
2101 | { | |
2102 | if (mis->state != MIGRATION_STATUS_POSTCOPY_RECOVER) { | |
2103 | error_report("%s: illegal resume received", __func__); | |
2104 | /* Don't fail the load, only for this. */ | |
2105 | return 0; | |
2106 | } | |
2107 | ||
cc5ab872 PX |
2108 | /* |
2109 | * Reset the last_rb before we resend any page req to source again, since | |
2110 | * the source should have it reset already. | |
2111 | */ | |
2112 | mis->last_rb = NULL; | |
2113 | ||
3f5875ec PX |
2114 | /* |
2115 | * This means source VM is ready to resume the postcopy migration. | |
3f5875ec PX |
2116 | */ |
2117 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_RECOVER, | |
2118 | MIGRATION_STATUS_POSTCOPY_ACTIVE); | |
3f5875ec PX |
2119 | |
2120 | trace_loadvm_postcopy_handle_resume(); | |
2121 | ||
13955b89 PX |
2122 | /* Tell source that "we are ready" */ |
2123 | migrate_send_rp_resume_ack(mis, MIGRATION_RESUME_ACK_VALUE); | |
3f5875ec | 2124 | |
0c26781c PX |
2125 | /* |
2126 | * After a postcopy recovery, the source should have lost the postcopy | |
2127 | * queue, or potentially the requested pages could have been lost during | |
2128 | * the network down phase. Let's re-sync with the source VM by re-sending | |
2129 | * all the pending pages that we eagerly need, so these threads won't get | |
2130 | * blocked too long due to the recovery. | |
2131 | * | |
2132 | * Without this procedure, the faulted destination VM threads (waiting for | |
2133 | * page requests right before the postcopy is interrupted) can keep hanging | |
2134 | * until the pages are sent by the source during the background copying of | |
2135 | * pages, or another thread faulted on the same address accidentally. | |
2136 | */ | |
2137 | migrate_send_rp_req_pages_pending(mis); | |
2138 | ||
5e773431 PX |
2139 | /* |
2140 | * It's time to switch state and release the fault thread to continue | |
2141 | * service page faults. Note that this should be explicitly after the | |
2142 | * above call to migrate_send_rp_req_pages_pending(). In short: | |
2143 | * migrate_send_rp_message_req_pages() is not thread safe, yet. | |
2144 | */ | |
2145 | qemu_sem_post(&mis->postcopy_pause_sem_fault); | |
2146 | ||
3f5875ec PX |
2147 | return 0; |
2148 | } | |
2149 | ||
c76ca188 | 2150 | /** |
11cf1d98 DDAG |
2151 | * Immediately following this command is a blob of data containing an embedded |
2152 | * chunk of migration stream; read it and load it. | |
2153 | * | |
2154 | * @mis: Incoming state | |
2155 | * @length: Length of packaged data to read | |
c76ca188 | 2156 | * |
11cf1d98 DDAG |
2157 | * Returns: Negative values on error |
2158 | * | |
2159 | */ | |
2160 | static int loadvm_handle_cmd_packaged(MigrationIncomingState *mis) | |
2161 | { | |
2162 | int ret; | |
61b67d47 DB |
2163 | size_t length; |
2164 | QIOChannelBuffer *bioc; | |
11cf1d98 DDAG |
2165 | |
2166 | length = qemu_get_be32(mis->from_src_file); | |
2167 | trace_loadvm_handle_cmd_packaged(length); | |
2168 | ||
2169 | if (length > MAX_VM_CMD_PACKAGED_SIZE) { | |
61b67d47 | 2170 | error_report("Unreasonably large packaged state: %zu", length); |
11cf1d98 DDAG |
2171 | return -1; |
2172 | } | |
61b67d47 DB |
2173 | |
2174 | bioc = qio_channel_buffer_new(length); | |
6f01f136 | 2175 | qio_channel_set_name(QIO_CHANNEL(bioc), "migration-loadvm-buffer"); |
61b67d47 DB |
2176 | ret = qemu_get_buffer(mis->from_src_file, |
2177 | bioc->data, | |
2178 | length); | |
11cf1d98 | 2179 | if (ret != length) { |
61b67d47 DB |
2180 | object_unref(OBJECT(bioc)); |
2181 | error_report("CMD_PACKAGED: Buffer receive fail ret=%d length=%zu", | |
9af9e0fe | 2182 | ret, length); |
11cf1d98 DDAG |
2183 | return (ret < 0) ? ret : -EAGAIN; |
2184 | } | |
61b67d47 | 2185 | bioc->usage += length; |
11cf1d98 DDAG |
2186 | trace_loadvm_handle_cmd_packaged_received(ret); |
2187 | ||
61b67d47 | 2188 | QEMUFile *packf = qemu_fopen_channel_input(QIO_CHANNEL(bioc)); |
11cf1d98 DDAG |
2189 | |
2190 | ret = qemu_loadvm_state_main(packf, mis); | |
2191 | trace_loadvm_handle_cmd_packaged_main(ret); | |
2192 | qemu_fclose(packf); | |
61b67d47 | 2193 | object_unref(OBJECT(bioc)); |
11cf1d98 DDAG |
2194 | |
2195 | return ret; | |
2196 | } | |
2197 | ||
f25d4225 PX |
2198 | /* |
2199 | * Handle request that source requests for recved_bitmap on | |
2200 | * destination. Payload format: | |
2201 | * | |
2202 | * len (1 byte) + ramblock_name (<255 bytes) | |
2203 | */ | |
2204 | static int loadvm_handle_recv_bitmap(MigrationIncomingState *mis, | |
2205 | uint16_t len) | |
2206 | { | |
2207 | QEMUFile *file = mis->from_src_file; | |
2208 | RAMBlock *rb; | |
2209 | char block_name[256]; | |
2210 | size_t cnt; | |
2211 | ||
2212 | cnt = qemu_get_counted_string(file, block_name); | |
2213 | if (!cnt) { | |
2214 | error_report("%s: failed to read block name", __func__); | |
2215 | return -EINVAL; | |
2216 | } | |
2217 | ||
2218 | /* Validate before using the data */ | |
2219 | if (qemu_file_get_error(file)) { | |
2220 | return qemu_file_get_error(file); | |
2221 | } | |
2222 | ||
2223 | if (len != cnt + 1) { | |
2224 | error_report("%s: invalid payload length (%d)", __func__, len); | |
2225 | return -EINVAL; | |
2226 | } | |
2227 | ||
2228 | rb = qemu_ram_block_by_name(block_name); | |
2229 | if (!rb) { | |
2230 | error_report("%s: block '%s' not found", __func__, block_name); | |
2231 | return -EINVAL; | |
2232 | } | |
2233 | ||
a335debb | 2234 | migrate_send_rp_recv_bitmap(mis, block_name); |
f25d4225 PX |
2235 | |
2236 | trace_loadvm_handle_recv_bitmap(block_name); | |
2237 | ||
2238 | return 0; | |
2239 | } | |
2240 | ||
aad555c2 ZC |
2241 | static int loadvm_process_enable_colo(MigrationIncomingState *mis) |
2242 | { | |
18b1d3c9 DH |
2243 | int ret = migration_incoming_enable_colo(); |
2244 | ||
2245 | if (!ret) { | |
2246 | ret = colo_init_ram_cache(); | |
2247 | if (ret) { | |
2248 | migration_incoming_disable_colo(); | |
2249 | } | |
2250 | } | |
2251 | return ret; | |
aad555c2 ZC |
2252 | } |
2253 | ||
11cf1d98 DDAG |
2254 | /* |
2255 | * Process an incoming 'QEMU_VM_COMMAND' | |
2256 | * 0 just a normal return | |
2257 | * LOADVM_QUIT All good, but exit the loop | |
2258 | * <0 Error | |
c76ca188 DDAG |
2259 | */ |
2260 | static int loadvm_process_command(QEMUFile *f) | |
2261 | { | |
2e37701e | 2262 | MigrationIncomingState *mis = migration_incoming_get_current(); |
c76ca188 DDAG |
2263 | uint16_t cmd; |
2264 | uint16_t len; | |
2e37701e | 2265 | uint32_t tmp32; |
c76ca188 DDAG |
2266 | |
2267 | cmd = qemu_get_be16(f); | |
2268 | len = qemu_get_be16(f); | |
2269 | ||
7a9ddfbf PX |
2270 | /* Check validity before continue processing of cmds */ |
2271 | if (qemu_file_get_error(f)) { | |
2272 | return qemu_file_get_error(f); | |
2273 | } | |
2274 | ||
c76ca188 DDAG |
2275 | trace_loadvm_process_command(cmd, len); |
2276 | if (cmd >= MIG_CMD_MAX || cmd == MIG_CMD_INVALID) { | |
2277 | error_report("MIG_CMD 0x%x unknown (len 0x%x)", cmd, len); | |
2278 | return -EINVAL; | |
2279 | } | |
2280 | ||
2281 | if (mig_cmd_args[cmd].len != -1 && mig_cmd_args[cmd].len != len) { | |
2282 | error_report("%s received with bad length - expecting %zu, got %d", | |
2283 | mig_cmd_args[cmd].name, | |
2284 | (size_t)mig_cmd_args[cmd].len, len); | |
2285 | return -ERANGE; | |
2286 | } | |
2287 | ||
2288 | switch (cmd) { | |
2e37701e DDAG |
2289 | case MIG_CMD_OPEN_RETURN_PATH: |
2290 | if (mis->to_src_file) { | |
2291 | error_report("CMD_OPEN_RETURN_PATH called when RP already open"); | |
2292 | /* Not really a problem, so don't give up */ | |
2293 | return 0; | |
2294 | } | |
2295 | mis->to_src_file = qemu_file_get_return_path(f); | |
2296 | if (!mis->to_src_file) { | |
2297 | error_report("CMD_OPEN_RETURN_PATH failed"); | |
2298 | return -1; | |
2299 | } | |
2300 | break; | |
2301 | ||
2302 | case MIG_CMD_PING: | |
2303 | tmp32 = qemu_get_be32(f); | |
2304 | trace_loadvm_process_command_ping(tmp32); | |
2305 | if (!mis->to_src_file) { | |
2306 | error_report("CMD_PING (0x%x) received with no return path", | |
2307 | tmp32); | |
2308 | return -1; | |
2309 | } | |
6decec93 | 2310 | migrate_send_rp_pong(mis, tmp32); |
2e37701e | 2311 | break; |
093e3c42 | 2312 | |
11cf1d98 DDAG |
2313 | case MIG_CMD_PACKAGED: |
2314 | return loadvm_handle_cmd_packaged(mis); | |
2315 | ||
093e3c42 | 2316 | case MIG_CMD_POSTCOPY_ADVISE: |
875fcd01 | 2317 | return loadvm_postcopy_handle_advise(mis, len); |
093e3c42 DDAG |
2318 | |
2319 | case MIG_CMD_POSTCOPY_LISTEN: | |
2320 | return loadvm_postcopy_handle_listen(mis); | |
2321 | ||
2322 | case MIG_CMD_POSTCOPY_RUN: | |
2323 | return loadvm_postcopy_handle_run(mis); | |
2324 | ||
2325 | case MIG_CMD_POSTCOPY_RAM_DISCARD: | |
2326 | return loadvm_postcopy_ram_handle_discard(mis, len); | |
f25d4225 | 2327 | |
3f5875ec PX |
2328 | case MIG_CMD_POSTCOPY_RESUME: |
2329 | return loadvm_postcopy_handle_resume(mis); | |
2330 | ||
f25d4225 PX |
2331 | case MIG_CMD_RECV_BITMAP: |
2332 | return loadvm_handle_recv_bitmap(mis, len); | |
aad555c2 ZC |
2333 | |
2334 | case MIG_CMD_ENABLE_COLO: | |
2335 | return loadvm_process_enable_colo(mis); | |
c76ca188 DDAG |
2336 | } |
2337 | ||
2338 | return 0; | |
2339 | } | |
2340 | ||
59f39a47 DDAG |
2341 | /* |
2342 | * Read a footer off the wire and check that it matches the expected section | |
2343 | * | |
2344 | * Returns: true if the footer was good | |
2345 | * false if there is a problem (and calls error_report to say why) | |
2346 | */ | |
0f42f657 | 2347 | static bool check_section_footer(QEMUFile *f, SaveStateEntry *se) |
59f39a47 | 2348 | { |
7a9ddfbf | 2349 | int ret; |
59f39a47 DDAG |
2350 | uint8_t read_mark; |
2351 | uint32_t read_section_id; | |
2352 | ||
15c38503 | 2353 | if (!migrate_get_current()->send_section_footer) { |
59f39a47 DDAG |
2354 | /* No footer to check */ |
2355 | return true; | |
2356 | } | |
2357 | ||
2358 | read_mark = qemu_get_byte(f); | |
2359 | ||
7a9ddfbf PX |
2360 | ret = qemu_file_get_error(f); |
2361 | if (ret) { | |
2362 | error_report("%s: Read section footer failed: %d", | |
2363 | __func__, ret); | |
2364 | return false; | |
2365 | } | |
2366 | ||
59f39a47 | 2367 | if (read_mark != QEMU_VM_SECTION_FOOTER) { |
0f42f657 | 2368 | error_report("Missing section footer for %s", se->idstr); |
59f39a47 DDAG |
2369 | return false; |
2370 | } | |
2371 | ||
2372 | read_section_id = qemu_get_be32(f); | |
0f42f657 | 2373 | if (read_section_id != se->load_section_id) { |
59f39a47 DDAG |
2374 | error_report("Mismatched section id in footer for %s -" |
2375 | " read 0x%x expected 0x%x", | |
0f42f657 | 2376 | se->idstr, read_section_id, se->load_section_id); |
59f39a47 DDAG |
2377 | return false; |
2378 | } | |
2379 | ||
2380 | /* All good */ | |
2381 | return true; | |
2382 | } | |
2383 | ||
fb3520a8 HZ |
2384 | static int |
2385 | qemu_loadvm_section_start_full(QEMUFile *f, MigrationIncomingState *mis) | |
2386 | { | |
2387 | uint32_t instance_id, version_id, section_id; | |
2388 | SaveStateEntry *se; | |
fb3520a8 HZ |
2389 | char idstr[256]; |
2390 | int ret; | |
2391 | ||
2392 | /* Read section start */ | |
2393 | section_id = qemu_get_be32(f); | |
2394 | if (!qemu_get_counted_string(f, idstr)) { | |
2395 | error_report("Unable to read ID string for section %u", | |
2396 | section_id); | |
2397 | return -EINVAL; | |
2398 | } | |
2399 | instance_id = qemu_get_be32(f); | |
2400 | version_id = qemu_get_be32(f); | |
2401 | ||
7a9ddfbf PX |
2402 | ret = qemu_file_get_error(f); |
2403 | if (ret) { | |
2404 | error_report("%s: Failed to read instance/version ID: %d", | |
2405 | __func__, ret); | |
2406 | return ret; | |
2407 | } | |
2408 | ||
fb3520a8 HZ |
2409 | trace_qemu_loadvm_state_section_startfull(section_id, idstr, |
2410 | instance_id, version_id); | |
2411 | /* Find savevm section */ | |
2412 | se = find_se(idstr, instance_id); | |
2413 | if (se == NULL) { | |
93062e23 | 2414 | error_report("Unknown savevm section or instance '%s' %"PRIu32". " |
827beacb JRZ |
2415 | "Make sure that your current VM setup matches your " |
2416 | "saved VM setup, including any hotplugged devices", | |
fb3520a8 HZ |
2417 | idstr, instance_id); |
2418 | return -EINVAL; | |
2419 | } | |
2420 | ||
2421 | /* Validate version */ | |
2422 | if (version_id > se->version_id) { | |
2423 | error_report("savevm: unsupported version %d for '%s' v%d", | |
2424 | version_id, idstr, se->version_id); | |
2425 | return -EINVAL; | |
2426 | } | |
0f42f657 JQ |
2427 | se->load_version_id = version_id; |
2428 | se->load_section_id = section_id; | |
fb3520a8 | 2429 | |
88c16567 WC |
2430 | /* Validate if it is a device's state */ |
2431 | if (xen_enabled() && se->is_ram) { | |
2432 | error_report("loadvm: %s RAM loading not allowed on Xen", idstr); | |
2433 | return -EINVAL; | |
2434 | } | |
2435 | ||
3a011c26 | 2436 | ret = vmstate_load(f, se); |
fb3520a8 | 2437 | if (ret < 0) { |
93062e23 | 2438 | error_report("error while loading state for instance 0x%"PRIx32" of" |
fb3520a8 HZ |
2439 | " device '%s'", instance_id, idstr); |
2440 | return ret; | |
2441 | } | |
0f42f657 | 2442 | if (!check_section_footer(f, se)) { |
fb3520a8 HZ |
2443 | return -EINVAL; |
2444 | } | |
2445 | ||
2446 | return 0; | |
2447 | } | |
2448 | ||
2449 | static int | |
2450 | qemu_loadvm_section_part_end(QEMUFile *f, MigrationIncomingState *mis) | |
2451 | { | |
2452 | uint32_t section_id; | |
0f42f657 | 2453 | SaveStateEntry *se; |
fb3520a8 HZ |
2454 | int ret; |
2455 | ||
2456 | section_id = qemu_get_be32(f); | |
2457 | ||
7a9ddfbf PX |
2458 | ret = qemu_file_get_error(f); |
2459 | if (ret) { | |
2460 | error_report("%s: Failed to read section ID: %d", | |
2461 | __func__, ret); | |
2462 | return ret; | |
2463 | } | |
2464 | ||
fb3520a8 | 2465 | trace_qemu_loadvm_state_section_partend(section_id); |
0f42f657 JQ |
2466 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
2467 | if (se->load_section_id == section_id) { | |
fb3520a8 HZ |
2468 | break; |
2469 | } | |
2470 | } | |
0f42f657 | 2471 | if (se == NULL) { |
fb3520a8 HZ |
2472 | error_report("Unknown savevm section %d", section_id); |
2473 | return -EINVAL; | |
2474 | } | |
2475 | ||
3a011c26 | 2476 | ret = vmstate_load(f, se); |
fb3520a8 HZ |
2477 | if (ret < 0) { |
2478 | error_report("error while loading state section id %d(%s)", | |
0f42f657 | 2479 | section_id, se->idstr); |
fb3520a8 HZ |
2480 | return ret; |
2481 | } | |
0f42f657 | 2482 | if (!check_section_footer(f, se)) { |
fb3520a8 HZ |
2483 | return -EINVAL; |
2484 | } | |
2485 | ||
2486 | return 0; | |
2487 | } | |
2488 | ||
16015d32 WY |
2489 | static int qemu_loadvm_state_header(QEMUFile *f) |
2490 | { | |
2491 | unsigned int v; | |
2492 | int ret; | |
2493 | ||
2494 | v = qemu_get_be32(f); | |
2495 | if (v != QEMU_VM_FILE_MAGIC) { | |
2496 | error_report("Not a migration stream"); | |
2497 | return -EINVAL; | |
2498 | } | |
2499 | ||
2500 | v = qemu_get_be32(f); | |
2501 | if (v == QEMU_VM_FILE_VERSION_COMPAT) { | |
2502 | error_report("SaveVM v2 format is obsolete and don't work anymore"); | |
2503 | return -ENOTSUP; | |
2504 | } | |
2505 | if (v != QEMU_VM_FILE_VERSION) { | |
2506 | error_report("Unsupported migration stream version"); | |
2507 | return -ENOTSUP; | |
2508 | } | |
2509 | ||
2510 | if (migrate_get_current()->send_configuration) { | |
2511 | if (qemu_get_byte(f) != QEMU_VM_CONFIGURATION) { | |
2512 | error_report("Configuration section missing"); | |
2513 | qemu_loadvm_state_cleanup(); | |
2514 | return -EINVAL; | |
2515 | } | |
2516 | ret = vmstate_load_state(f, &vmstate_configuration, &savevm_state, 0); | |
2517 | ||
2518 | if (ret) { | |
2519 | qemu_loadvm_state_cleanup(); | |
2520 | return ret; | |
2521 | } | |
2522 | } | |
2523 | return 0; | |
2524 | } | |
2525 | ||
acb5ea86 JQ |
2526 | static int qemu_loadvm_state_setup(QEMUFile *f) |
2527 | { | |
2528 | SaveStateEntry *se; | |
2529 | int ret; | |
2530 | ||
2531 | trace_loadvm_state_setup(); | |
2532 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { | |
2533 | if (!se->ops || !se->ops->load_setup) { | |
2534 | continue; | |
2535 | } | |
cea3b4c0 | 2536 | if (se->ops->is_active) { |
acb5ea86 JQ |
2537 | if (!se->ops->is_active(se->opaque)) { |
2538 | continue; | |
2539 | } | |
2540 | } | |
2541 | ||
2542 | ret = se->ops->load_setup(f, se->opaque); | |
2543 | if (ret < 0) { | |
2544 | qemu_file_set_error(f, ret); | |
2545 | error_report("Load state of device %s failed", se->idstr); | |
2546 | return ret; | |
2547 | } | |
2548 | } | |
2549 | return 0; | |
2550 | } | |
2551 | ||
2552 | void qemu_loadvm_state_cleanup(void) | |
2553 | { | |
2554 | SaveStateEntry *se; | |
2555 | ||
2556 | trace_loadvm_state_cleanup(); | |
2557 | QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { | |
2558 | if (se->ops && se->ops->load_cleanup) { | |
2559 | se->ops->load_cleanup(se->opaque); | |
2560 | } | |
2561 | } | |
2562 | } | |
2563 | ||
b411b844 PX |
2564 | /* Return true if we should continue the migration, or false. */ |
2565 | static bool postcopy_pause_incoming(MigrationIncomingState *mis) | |
2566 | { | |
2567 | trace_postcopy_pause_incoming(); | |
2568 | ||
ee647225 VSO |
2569 | assert(migrate_postcopy_ram()); |
2570 | ||
02affd41 PX |
2571 | /* Clear the triggered bit to allow one recovery */ |
2572 | mis->postcopy_recover_triggered = false; | |
2573 | ||
39675fff PX |
2574 | /* |
2575 | * Unregister yank with either from/to src would work, since ioc behind it | |
2576 | * is the same | |
2577 | */ | |
2578 | migration_ioc_unregister_yank_from_file(mis->from_src_file); | |
2579 | ||
b411b844 PX |
2580 | assert(mis->from_src_file); |
2581 | qemu_file_shutdown(mis->from_src_file); | |
2582 | qemu_fclose(mis->from_src_file); | |
2583 | mis->from_src_file = NULL; | |
2584 | ||
2585 | assert(mis->to_src_file); | |
2586 | qemu_file_shutdown(mis->to_src_file); | |
2587 | qemu_mutex_lock(&mis->rp_mutex); | |
2588 | qemu_fclose(mis->to_src_file); | |
2589 | mis->to_src_file = NULL; | |
2590 | qemu_mutex_unlock(&mis->rp_mutex); | |
2591 | ||
eed1cc78 PX |
2592 | migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
2593 | MIGRATION_STATUS_POSTCOPY_PAUSED); | |
2594 | ||
3a7804c3 PX |
2595 | /* Notify the fault thread for the invalidated file handle */ |
2596 | postcopy_fault_thread_notify(mis); | |
2597 | ||
b411b844 PX |
2598 | error_report("Detected IO failure for postcopy. " |
2599 | "Migration paused."); | |
2600 | ||
2601 | while (mis->state == MIGRATION_STATUS_POSTCOPY_PAUSED) { | |
2602 | qemu_sem_wait(&mis->postcopy_pause_sem_dst); | |
2603 | } | |
2604 | ||
2605 | trace_postcopy_pause_incoming_continued(); | |
2606 | ||
2607 | return true; | |
2608 | } | |
2609 | ||
3f6df99d | 2610 | int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis) |
1a8f46f8 | 2611 | { |
a672b469 | 2612 | uint8_t section_type; |
ccb783c3 | 2613 | int ret = 0; |
61964c23 | 2614 | |
b411b844 | 2615 | retry: |
7a9ddfbf PX |
2616 | while (true) { |
2617 | section_type = qemu_get_byte(f); | |
2618 | ||
2619 | if (qemu_file_get_error(f)) { | |
2620 | ret = qemu_file_get_error(f); | |
2621 | break; | |
2622 | } | |
2623 | ||
a5df2a02 | 2624 | trace_qemu_loadvm_state_section(section_type); |
a672b469 AL |
2625 | switch (section_type) { |
2626 | case QEMU_VM_SECTION_START: | |
2627 | case QEMU_VM_SECTION_FULL: | |
fb3520a8 | 2628 | ret = qemu_loadvm_section_start_full(f, mis); |
b5a22e4a | 2629 | if (ret < 0) { |
ccb783c3 | 2630 | goto out; |
b5a22e4a | 2631 | } |
a672b469 AL |
2632 | break; |
2633 | case QEMU_VM_SECTION_PART: | |
2634 | case QEMU_VM_SECTION_END: | |
fb3520a8 | 2635 | ret = qemu_loadvm_section_part_end(f, mis); |
b5a22e4a | 2636 | if (ret < 0) { |
ccb783c3 | 2637 | goto out; |
b5a22e4a | 2638 | } |
a672b469 | 2639 | break; |
c76ca188 DDAG |
2640 | case QEMU_VM_COMMAND: |
2641 | ret = loadvm_process_command(f); | |
7b89bf27 | 2642 | trace_qemu_loadvm_state_section_command(ret); |
4695ce3f | 2643 | if ((ret < 0) || (ret == LOADVM_QUIT)) { |
ccb783c3 | 2644 | goto out; |
c76ca188 DDAG |
2645 | } |
2646 | break; | |
7a9ddfbf PX |
2647 | case QEMU_VM_EOF: |
2648 | /* This is the end of migration */ | |
2649 | goto out; | |
a672b469 | 2650 | default: |
6a64b644 | 2651 | error_report("Unknown savevm section type %d", section_type); |
ccb783c3 DDAG |
2652 | ret = -EINVAL; |
2653 | goto out; | |
a672b469 AL |
2654 | } |
2655 | } | |
2656 | ||
ccb783c3 DDAG |
2657 | out: |
2658 | if (ret < 0) { | |
2659 | qemu_file_set_error(f, ret); | |
b411b844 | 2660 | |
ee647225 VSO |
2661 | /* Cancel bitmaps incoming regardless of recovery */ |
2662 | dirty_bitmap_mig_cancel_incoming(); | |
2663 | ||
b411b844 | 2664 | /* |
fd037a65 PX |
2665 | * If we are during an active postcopy, then we pause instead |
2666 | * of bail out to at least keep the VM's dirty data. Note | |
2667 | * that POSTCOPY_INCOMING_LISTENING stage is still not enough, | |
2668 | * during which we're still receiving device states and we | |
2669 | * still haven't yet started the VM on destination. | |
ee647225 VSO |
2670 | * |
2671 | * Only RAM postcopy supports recovery. Still, if RAM postcopy is | |
2672 | * enabled, canceled bitmaps postcopy will not affect RAM postcopy | |
2673 | * recovering. | |
b411b844 PX |
2674 | */ |
2675 | if (postcopy_state_get() == POSTCOPY_INCOMING_RUNNING && | |
ee647225 | 2676 | migrate_postcopy_ram() && postcopy_pause_incoming(mis)) { |
b411b844 PX |
2677 | /* Reset f to point to the newly created channel */ |
2678 | f = mis->from_src_file; | |
2679 | goto retry; | |
2680 | } | |
ccb783c3 DDAG |
2681 | } |
2682 | return ret; | |
7b89bf27 DDAG |
2683 | } |
2684 | ||
2685 | int qemu_loadvm_state(QEMUFile *f) | |
2686 | { | |
2687 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
2688 | Error *local_err = NULL; | |
7b89bf27 DDAG |
2689 | int ret; |
2690 | ||
2691 | if (qemu_savevm_state_blocked(&local_err)) { | |
2692 | error_report_err(local_err); | |
2693 | return -EINVAL; | |
2694 | } | |
2695 | ||
16015d32 WY |
2696 | ret = qemu_loadvm_state_header(f); |
2697 | if (ret) { | |
2698 | return ret; | |
7b89bf27 DDAG |
2699 | } |
2700 | ||
9e14b849 WY |
2701 | if (qemu_loadvm_state_setup(f) != 0) { |
2702 | return -EINVAL; | |
2703 | } | |
2704 | ||
75e972da DG |
2705 | cpu_synchronize_all_pre_loadvm(); |
2706 | ||
7b89bf27 DDAG |
2707 | ret = qemu_loadvm_state_main(f, mis); |
2708 | qemu_event_set(&mis->main_thread_load_event); | |
2709 | ||
2710 | trace_qemu_loadvm_state_post_main(ret); | |
2711 | ||
c76201ab DDAG |
2712 | if (mis->have_listen_thread) { |
2713 | /* Listen thread still going, can't clean up yet */ | |
2714 | return ret; | |
2715 | } | |
2716 | ||
7b89bf27 DDAG |
2717 | if (ret == 0) { |
2718 | ret = qemu_file_get_error(f); | |
2719 | } | |
1925cebc AG |
2720 | |
2721 | /* | |
2722 | * Try to read in the VMDESC section as well, so that dumping tools that | |
2723 | * intercept our migration stream have the chance to see it. | |
2724 | */ | |
1aca9a5f DDAG |
2725 | |
2726 | /* We've got to be careful; if we don't read the data and just shut the fd | |
2727 | * then the sender can error if we close while it's still sending. | |
2728 | * We also mustn't read data that isn't there; some transports (RDMA) | |
2729 | * will stall waiting for that data when the source has already closed. | |
2730 | */ | |
7b89bf27 | 2731 | if (ret == 0 && should_send_vmdesc()) { |
1aca9a5f DDAG |
2732 | uint8_t *buf; |
2733 | uint32_t size; | |
7b89bf27 | 2734 | uint8_t section_type = qemu_get_byte(f); |
1aca9a5f DDAG |
2735 | |
2736 | if (section_type != QEMU_VM_VMDESCRIPTION) { | |
2737 | error_report("Expected vmdescription section, but got %d", | |
2738 | section_type); | |
2739 | /* | |
2740 | * It doesn't seem worth failing at this point since | |
2741 | * we apparently have an otherwise valid VM state | |
2742 | */ | |
2743 | } else { | |
2744 | buf = g_malloc(0x1000); | |
2745 | size = qemu_get_be32(f); | |
2746 | ||
2747 | while (size > 0) { | |
2748 | uint32_t read_chunk = MIN(size, 0x1000); | |
2749 | qemu_get_buffer(f, buf, read_chunk); | |
2750 | size -= read_chunk; | |
2751 | } | |
2752 | g_free(buf); | |
1925cebc | 2753 | } |
1925cebc AG |
2754 | } |
2755 | ||
acb5ea86 | 2756 | qemu_loadvm_state_cleanup(); |
ea375f9a JK |
2757 | cpu_synchronize_all_post_init(); |
2758 | ||
a672b469 AL |
2759 | return ret; |
2760 | } | |
2761 | ||
3f6df99d ZC |
2762 | int qemu_load_device_state(QEMUFile *f) |
2763 | { | |
2764 | MigrationIncomingState *mis = migration_incoming_get_current(); | |
2765 | int ret; | |
2766 | ||
2767 | /* Load QEMU_VM_SECTION_FULL section */ | |
2768 | ret = qemu_loadvm_state_main(f, mis); | |
2769 | if (ret < 0) { | |
2770 | error_report("Failed to load device state: %d", ret); | |
2771 | return ret; | |
2772 | } | |
2773 | ||
2774 | cpu_synchronize_all_post_init(); | |
2775 | return 0; | |
2776 | } | |
2777 | ||
f1a9fcdd DB |
2778 | bool save_snapshot(const char *name, bool overwrite, const char *vmstate, |
2779 | bool has_devices, strList *devices, Error **errp) | |
a672b469 | 2780 | { |
e26f98e2 | 2781 | BlockDriverState *bs; |
80ef0586 | 2782 | QEMUSnapshotInfo sn1, *sn = &sn1; |
66270a47 | 2783 | int ret = -1, ret2; |
a672b469 AL |
2784 | QEMUFile *f; |
2785 | int saved_vm_running; | |
c2c9a466 | 2786 | uint64_t vm_state_size; |
85cd1cc6 | 2787 | g_autoptr(GDateTime) now = g_date_time_new_now_local(); |
79b3c12a | 2788 | AioContext *aio_context; |
a672b469 | 2789 | |
5aaac467 | 2790 | if (migration_is_blocked(errp)) { |
7ea14df2 | 2791 | return false; |
5aaac467 PB |
2792 | } |
2793 | ||
377b21cc | 2794 | if (!replay_can_snapshot()) { |
4dd32b3d MA |
2795 | error_setg(errp, "Record/replay does not allow making snapshot " |
2796 | "right now. Try once more later."); | |
7ea14df2 | 2797 | return false; |
377b21cc PD |
2798 | } |
2799 | ||
f1a9fcdd | 2800 | if (!bdrv_all_can_snapshot(has_devices, devices, errp)) { |
7ea14df2 | 2801 | return false; |
feeee5ac MDCF |
2802 | } |
2803 | ||
0b461605 | 2804 | /* Delete old snapshots of the same name */ |
ac8c19ba | 2805 | if (name) { |
f781f841 | 2806 | if (overwrite) { |
f1a9fcdd DB |
2807 | if (bdrv_all_delete_snapshot(name, has_devices, |
2808 | devices, errp) < 0) { | |
f781f841 DB |
2809 | return false; |
2810 | } | |
2811 | } else { | |
f1a9fcdd | 2812 | ret2 = bdrv_all_has_snapshot(name, has_devices, devices, errp); |
f781f841 DB |
2813 | if (ret2 < 0) { |
2814 | return false; | |
2815 | } | |
2816 | if (ret2 == 1) { | |
2817 | error_setg(errp, | |
2818 | "Snapshot '%s' already exists in one or more devices", | |
2819 | name); | |
2820 | return false; | |
2821 | } | |
ac8c19ba | 2822 | } |
0b461605 DL |
2823 | } |
2824 | ||
f1a9fcdd | 2825 | bs = bdrv_all_find_vmstate_bs(vmstate, has_devices, devices, errp); |
7cb14481 | 2826 | if (bs == NULL) { |
7ea14df2 | 2827 | return false; |
a672b469 | 2828 | } |
79b3c12a | 2829 | aio_context = bdrv_get_aio_context(bs); |
a672b469 | 2830 | |
1354869c | 2831 | saved_vm_running = runstate_is_running(); |
560d027b JQ |
2832 | |
2833 | ret = global_state_store(); | |
2834 | if (ret) { | |
927d6638 | 2835 | error_setg(errp, "Error saving global state"); |
7ea14df2 | 2836 | return false; |
560d027b | 2837 | } |
0461d5a6 | 2838 | vm_stop(RUN_STATE_SAVE_VM); |
a672b469 | 2839 | |
8649f2f9 SH |
2840 | bdrv_drain_all_begin(); |
2841 | ||
79b3c12a DL |
2842 | aio_context_acquire(aio_context); |
2843 | ||
cb499fb2 | 2844 | memset(sn, 0, sizeof(*sn)); |
a672b469 AL |
2845 | |
2846 | /* fill auxiliary fields */ | |
85cd1cc6 DB |
2847 | sn->date_sec = g_date_time_to_unix(now); |
2848 | sn->date_nsec = g_date_time_get_microsecond(now) * 1000; | |
bc72ad67 | 2849 | sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); |
b39847a5 PD |
2850 | if (replay_mode != REPLAY_MODE_NONE) { |
2851 | sn->icount = replay_get_current_icount(); | |
2852 | } else { | |
2853 | sn->icount = -1ULL; | |
2854 | } | |
a672b469 | 2855 | |
7d631a11 | 2856 | if (name) { |
80ef0586 | 2857 | pstrcpy(sn->name, sizeof(sn->name), name); |
7d631a11 | 2858 | } else { |
85cd1cc6 DB |
2859 | g_autofree char *autoname = g_date_time_format(now, "vm-%Y%m%d%H%M%S"); |
2860 | pstrcpy(sn->name, sizeof(sn->name), autoname); | |
7d631a11 MDCF |
2861 | } |
2862 | ||
a672b469 | 2863 | /* save the VM state */ |
45566e9c | 2864 | f = qemu_fopen_bdrv(bs, 1); |
a672b469 | 2865 | if (!f) { |
927d6638 | 2866 | error_setg(errp, "Could not open VM state file"); |
a672b469 AL |
2867 | goto the_end; |
2868 | } | |
927d6638 | 2869 | ret = qemu_savevm_state(f, errp); |
2d22b18f | 2870 | vm_state_size = qemu_ftell(f); |
66270a47 | 2871 | ret2 = qemu_fclose(f); |
a672b469 | 2872 | if (ret < 0) { |
a672b469 AL |
2873 | goto the_end; |
2874 | } | |
66270a47 DL |
2875 | if (ret2 < 0) { |
2876 | ret = ret2; | |
2877 | goto the_end; | |
2878 | } | |
a672b469 | 2879 | |
17e2a4a4 SH |
2880 | /* The bdrv_all_create_snapshot() call that follows acquires the AioContext |
2881 | * for itself. BDRV_POLL_WHILE() does not support nested locking because | |
2882 | * it only releases the lock once. Therefore synchronous I/O will deadlock | |
2883 | * unless we release the AioContext before bdrv_all_create_snapshot(). | |
2884 | */ | |
2885 | aio_context_release(aio_context); | |
2886 | aio_context = NULL; | |
2887 | ||
f1a9fcdd DB |
2888 | ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, |
2889 | has_devices, devices, errp); | |
a9085f9b | 2890 | if (ret < 0) { |
f1a9fcdd | 2891 | bdrv_all_delete_snapshot(sn->name, has_devices, devices, NULL); |
ac8c19ba | 2892 | goto the_end; |
a672b469 AL |
2893 | } |
2894 | ||
ac8c19ba PD |
2895 | ret = 0; |
2896 | ||
a672b469 | 2897 | the_end: |
17e2a4a4 SH |
2898 | if (aio_context) { |
2899 | aio_context_release(aio_context); | |
2900 | } | |
8649f2f9 SH |
2901 | |
2902 | bdrv_drain_all_end(); | |
2903 | ||
38ff78d3 | 2904 | if (saved_vm_running) { |
a672b469 | 2905 | vm_start(); |
38ff78d3 | 2906 | } |
7ea14df2 | 2907 | return ret == 0; |
ac8c19ba PD |
2908 | } |
2909 | ||
5d6c599f AP |
2910 | void qmp_xen_save_devices_state(const char *filename, bool has_live, bool live, |
2911 | Error **errp) | |
a7ae8355 SS |
2912 | { |
2913 | QEMUFile *f; | |
8925839f | 2914 | QIOChannelFile *ioc; |
a7ae8355 SS |
2915 | int saved_vm_running; |
2916 | int ret; | |
2917 | ||
5d6c599f AP |
2918 | if (!has_live) { |
2919 | /* live default to true so old version of Xen tool stack can have a | |
3a4452d8 | 2920 | * successful live migration */ |
5d6c599f AP |
2921 | live = true; |
2922 | } | |
2923 | ||
a7ae8355 SS |
2924 | saved_vm_running = runstate_is_running(); |
2925 | vm_stop(RUN_STATE_SAVE_VM); | |
c69adea4 | 2926 | global_state_store_running(); |
a7ae8355 | 2927 | |
b4deb9bf DM |
2928 | ioc = qio_channel_file_new_path(filename, O_WRONLY | O_CREAT | O_TRUNC, |
2929 | 0660, errp); | |
8925839f | 2930 | if (!ioc) { |
a7ae8355 SS |
2931 | goto the_end; |
2932 | } | |
6f01f136 | 2933 | qio_channel_set_name(QIO_CHANNEL(ioc), "migration-xen-save-state"); |
8925839f | 2934 | f = qemu_fopen_channel_output(QIO_CHANNEL(ioc)); |
032b79f7 | 2935 | object_unref(OBJECT(ioc)); |
a7ae8355 | 2936 | ret = qemu_save_device_state(f); |
96994fd1 | 2937 | if (ret < 0 || qemu_fclose(f) < 0) { |
c6bd8c70 | 2938 | error_setg(errp, QERR_IO_ERROR); |
5d6c599f AP |
2939 | } else { |
2940 | /* libxl calls the QMP command "stop" before calling | |
2941 | * "xen-save-devices-state" and in case of migration failure, libxl | |
2942 | * would call "cont". | |
2943 | * So call bdrv_inactivate_all (release locks) here to let the other | |
3a4452d8 | 2944 | * side of the migration take control of the images. |
5d6c599f AP |
2945 | */ |
2946 | if (live && !saved_vm_running) { | |
2947 | ret = bdrv_inactivate_all(); | |
2948 | if (ret) { | |
2949 | error_setg(errp, "%s: bdrv_inactivate_all() failed (%d)", | |
2950 | __func__, ret); | |
2951 | } | |
2952 | } | |
a7ae8355 SS |
2953 | } |
2954 | ||
2955 | the_end: | |
38ff78d3 | 2956 | if (saved_vm_running) { |
a7ae8355 | 2957 | vm_start(); |
38ff78d3 | 2958 | } |
a7ae8355 SS |
2959 | } |
2960 | ||
88c16567 WC |
2961 | void qmp_xen_load_devices_state(const char *filename, Error **errp) |
2962 | { | |
2963 | QEMUFile *f; | |
2964 | QIOChannelFile *ioc; | |
2965 | int ret; | |
2966 | ||
2967 | /* Guest must be paused before loading the device state; the RAM state | |
2968 | * will already have been loaded by xc | |
2969 | */ | |
2970 | if (runstate_is_running()) { | |
2971 | error_setg(errp, "Cannot update device state while vm is running"); | |
2972 | return; | |
2973 | } | |
2974 | vm_stop(RUN_STATE_RESTORE_VM); | |
2975 | ||
2976 | ioc = qio_channel_file_new_path(filename, O_RDONLY | O_BINARY, 0, errp); | |
2977 | if (!ioc) { | |
2978 | return; | |
2979 | } | |
6f01f136 | 2980 | qio_channel_set_name(QIO_CHANNEL(ioc), "migration-xen-load-state"); |
88c16567 | 2981 | f = qemu_fopen_channel_input(QIO_CHANNEL(ioc)); |
032b79f7 | 2982 | object_unref(OBJECT(ioc)); |
88c16567 | 2983 | |
88c16567 WC |
2984 | ret = qemu_loadvm_state(f); |
2985 | qemu_fclose(f); | |
2986 | if (ret < 0) { | |
2987 | error_setg(errp, QERR_IO_ERROR); | |
2988 | } | |
2989 | migration_incoming_state_destroy(); | |
2990 | } | |
2991 | ||
f1a9fcdd DB |
2992 | bool load_snapshot(const char *name, const char *vmstate, |
2993 | bool has_devices, strList *devices, Error **errp) | |
a672b469 | 2994 | { |
e26f98e2 | 2995 | BlockDriverState *bs_vm_state; |
2d22b18f | 2996 | QEMUSnapshotInfo sn; |
a672b469 | 2997 | QEMUFile *f; |
751c6a17 | 2998 | int ret; |
79b3c12a | 2999 | AioContext *aio_context; |
b4b076da | 3000 | MigrationIncomingState *mis = migration_incoming_get_current(); |
a672b469 | 3001 | |
f1a9fcdd | 3002 | if (!bdrv_all_can_snapshot(has_devices, devices, errp)) { |
f61fe11a | 3003 | return false; |
849f96e2 | 3004 | } |
f1a9fcdd | 3005 | ret = bdrv_all_has_snapshot(name, has_devices, devices, errp); |
723ccda1 | 3006 | if (ret < 0) { |
f61fe11a | 3007 | return false; |
723ccda1 | 3008 | } |
3d3e9b1f DB |
3009 | if (ret == 0) { |
3010 | error_setg(errp, "Snapshot '%s' does not exist in one or more devices", | |
3011 | name); | |
3012 | return false; | |
3013 | } | |
849f96e2 | 3014 | |
f1a9fcdd | 3015 | bs_vm_state = bdrv_all_find_vmstate_bs(vmstate, has_devices, devices, errp); |
f0aa7a8b | 3016 | if (!bs_vm_state) { |
f61fe11a | 3017 | return false; |
f0aa7a8b | 3018 | } |
79b3c12a | 3019 | aio_context = bdrv_get_aio_context(bs_vm_state); |
f0aa7a8b MDCF |
3020 | |
3021 | /* Don't even try to load empty VM states */ | |
79b3c12a | 3022 | aio_context_acquire(aio_context); |
f0aa7a8b | 3023 | ret = bdrv_snapshot_find(bs_vm_state, &sn, name); |
79b3c12a | 3024 | aio_context_release(aio_context); |
f0aa7a8b | 3025 | if (ret < 0) { |
f61fe11a | 3026 | return false; |
f0aa7a8b | 3027 | } else if (sn.vm_state_size == 0) { |
927d6638 JQ |
3028 | error_setg(errp, "This is a disk-only snapshot. Revert to it " |
3029 | " offline using qemu-img"); | |
f61fe11a | 3030 | return false; |
f0aa7a8b MDCF |
3031 | } |
3032 | ||
f9a9fb65 PD |
3033 | /* |
3034 | * Flush the record/replay queue. Now the VM state is going | |
3035 | * to change. Therefore we don't need to preserve its consistency | |
3036 | */ | |
3037 | replay_flush_events(); | |
3038 | ||
a672b469 | 3039 | /* Flush all IO requests so they don't interfere with the new state. */ |
8649f2f9 | 3040 | bdrv_drain_all_begin(); |
a672b469 | 3041 | |
f1a9fcdd | 3042 | ret = bdrv_all_goto_snapshot(name, has_devices, devices, errp); |
4c1cdbaa | 3043 | if (ret < 0) { |
8649f2f9 | 3044 | goto err_drain; |
a672b469 AL |
3045 | } |
3046 | ||
a672b469 | 3047 | /* restore the VM state */ |
f0aa7a8b | 3048 | f = qemu_fopen_bdrv(bs_vm_state, 0); |
a672b469 | 3049 | if (!f) { |
927d6638 | 3050 | error_setg(errp, "Could not open VM state file"); |
8649f2f9 | 3051 | goto err_drain; |
a672b469 | 3052 | } |
f0aa7a8b | 3053 | |
aedbe192 | 3054 | qemu_system_reset(SHUTDOWN_CAUSE_NONE); |
b4b076da | 3055 | mis->from_src_file = f; |
f0aa7a8b | 3056 | |
b5eea99e LS |
3057 | if (!yank_register_instance(MIGRATION_YANK_INSTANCE, errp)) { |
3058 | ret = -EINVAL; | |
3059 | goto err_drain; | |
3060 | } | |
79b3c12a DL |
3061 | aio_context_acquire(aio_context); |
3062 | ret = qemu_loadvm_state(f); | |
1575829d | 3063 | migration_incoming_state_destroy(); |
79b3c12a DL |
3064 | aio_context_release(aio_context); |
3065 | ||
8649f2f9 SH |
3066 | bdrv_drain_all_end(); |
3067 | ||
a672b469 | 3068 | if (ret < 0) { |
927d6638 | 3069 | error_setg(errp, "Error %d while loading VM state", ret); |
f61fe11a | 3070 | return false; |
a672b469 | 3071 | } |
f0aa7a8b | 3072 | |
f61fe11a | 3073 | return true; |
8649f2f9 SH |
3074 | |
3075 | err_drain: | |
3076 | bdrv_drain_all_end(); | |
f61fe11a | 3077 | return false; |
7b630349 JQ |
3078 | } |
3079 | ||
bef7e9e2 DB |
3080 | bool delete_snapshot(const char *name, bool has_devices, |
3081 | strList *devices, Error **errp) | |
3082 | { | |
3083 | if (!bdrv_all_can_snapshot(has_devices, devices, errp)) { | |
3084 | return false; | |
3085 | } | |
3086 | ||
3087 | if (bdrv_all_delete_snapshot(name, has_devices, devices, errp) < 0) { | |
3088 | return false; | |
3089 | } | |
3090 | ||
3091 | return true; | |
3092 | } | |
3093 | ||
c5705a77 AK |
3094 | void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev) |
3095 | { | |
fa53a0e5 | 3096 | qemu_ram_set_idstr(mr->ram_block, |
c5705a77 | 3097 | memory_region_name(mr), dev); |
b895de50 | 3098 | qemu_ram_set_migratable(mr->ram_block); |
c5705a77 AK |
3099 | } |
3100 | ||
3101 | void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev) | |
3102 | { | |
fa53a0e5 | 3103 | qemu_ram_unset_idstr(mr->ram_block); |
b895de50 | 3104 | qemu_ram_unset_migratable(mr->ram_block); |
c5705a77 AK |
3105 | } |
3106 | ||
3107 | void vmstate_register_ram_global(MemoryRegion *mr) | |
3108 | { | |
3109 | vmstate_register_ram(mr, NULL); | |
3110 | } | |
1bfe5f05 JQ |
3111 | |
3112 | bool vmstate_check_only_migratable(const VMStateDescription *vmsd) | |
3113 | { | |
3114 | /* check needed if --only-migratable is specified */ | |
811f8652 | 3115 | if (!only_migratable) { |
1bfe5f05 JQ |
3116 | return true; |
3117 | } | |
3118 | ||
3119 | return !(vmsd && vmsd->unmigratable); | |
3120 | } | |
0f0d83a4 DB |
3121 | |
3122 | typedef struct SnapshotJob { | |
3123 | Job common; | |
3124 | char *tag; | |
3125 | char *vmstate; | |
3126 | strList *devices; | |
3127 | Coroutine *co; | |
3128 | Error **errp; | |
3129 | bool ret; | |
3130 | } SnapshotJob; | |
3131 | ||
3132 | static void qmp_snapshot_job_free(SnapshotJob *s) | |
3133 | { | |
3134 | g_free(s->tag); | |
3135 | g_free(s->vmstate); | |
3136 | qapi_free_strList(s->devices); | |
3137 | } | |
3138 | ||
3139 | ||
3140 | static void snapshot_load_job_bh(void *opaque) | |
3141 | { | |
3142 | Job *job = opaque; | |
3143 | SnapshotJob *s = container_of(job, SnapshotJob, common); | |
3144 | int orig_vm_running; | |
3145 | ||
3146 | job_progress_set_remaining(&s->common, 1); | |
3147 | ||
3148 | orig_vm_running = runstate_is_running(); | |
3149 | vm_stop(RUN_STATE_RESTORE_VM); | |
3150 | ||
3151 | s->ret = load_snapshot(s->tag, s->vmstate, true, s->devices, s->errp); | |
3152 | if (s->ret && orig_vm_running) { | |
3153 | vm_start(); | |
3154 | } | |
3155 | ||
3156 | job_progress_update(&s->common, 1); | |
3157 | ||
3158 | qmp_snapshot_job_free(s); | |
3159 | aio_co_wake(s->co); | |
3160 | } | |
3161 | ||
3162 | static void snapshot_save_job_bh(void *opaque) | |
3163 | { | |
3164 | Job *job = opaque; | |
3165 | SnapshotJob *s = container_of(job, SnapshotJob, common); | |
3166 | ||
3167 | job_progress_set_remaining(&s->common, 1); | |
3168 | s->ret = save_snapshot(s->tag, false, s->vmstate, | |
3169 | true, s->devices, s->errp); | |
3170 | job_progress_update(&s->common, 1); | |
3171 | ||
3172 | qmp_snapshot_job_free(s); | |
3173 | aio_co_wake(s->co); | |
3174 | } | |
3175 | ||
3176 | static void snapshot_delete_job_bh(void *opaque) | |
3177 | { | |
3178 | Job *job = opaque; | |
3179 | SnapshotJob *s = container_of(job, SnapshotJob, common); | |
3180 | ||
3181 | job_progress_set_remaining(&s->common, 1); | |
3182 | s->ret = delete_snapshot(s->tag, true, s->devices, s->errp); | |
3183 | job_progress_update(&s->common, 1); | |
3184 | ||
3185 | qmp_snapshot_job_free(s); | |
3186 | aio_co_wake(s->co); | |
3187 | } | |
3188 | ||
3189 | static int coroutine_fn snapshot_save_job_run(Job *job, Error **errp) | |
3190 | { | |
3191 | SnapshotJob *s = container_of(job, SnapshotJob, common); | |
3192 | s->errp = errp; | |
3193 | s->co = qemu_coroutine_self(); | |
3194 | aio_bh_schedule_oneshot(qemu_get_aio_context(), | |
3195 | snapshot_save_job_bh, job); | |
3196 | qemu_coroutine_yield(); | |
3197 | return s->ret ? 0 : -1; | |
3198 | } | |
3199 | ||
3200 | static int coroutine_fn snapshot_load_job_run(Job *job, Error **errp) | |
3201 | { | |
3202 | SnapshotJob *s = container_of(job, SnapshotJob, common); | |
3203 | s->errp = errp; | |
3204 | s->co = qemu_coroutine_self(); | |
3205 | aio_bh_schedule_oneshot(qemu_get_aio_context(), | |
3206 | snapshot_load_job_bh, job); | |
3207 | qemu_coroutine_yield(); | |
3208 | return s->ret ? 0 : -1; | |
3209 | } | |
3210 | ||
3211 | static int coroutine_fn snapshot_delete_job_run(Job *job, Error **errp) | |
3212 | { | |
3213 | SnapshotJob *s = container_of(job, SnapshotJob, common); | |
3214 | s->errp = errp; | |
3215 | s->co = qemu_coroutine_self(); | |
3216 | aio_bh_schedule_oneshot(qemu_get_aio_context(), | |
3217 | snapshot_delete_job_bh, job); | |
3218 | qemu_coroutine_yield(); | |
3219 | return s->ret ? 0 : -1; | |
3220 | } | |
3221 | ||
3222 | ||
3223 | static const JobDriver snapshot_load_job_driver = { | |
3224 | .instance_size = sizeof(SnapshotJob), | |
3225 | .job_type = JOB_TYPE_SNAPSHOT_LOAD, | |
3226 | .run = snapshot_load_job_run, | |
3227 | }; | |
3228 | ||
3229 | static const JobDriver snapshot_save_job_driver = { | |
3230 | .instance_size = sizeof(SnapshotJob), | |
3231 | .job_type = JOB_TYPE_SNAPSHOT_SAVE, | |
3232 | .run = snapshot_save_job_run, | |
3233 | }; | |
3234 | ||
3235 | static const JobDriver snapshot_delete_job_driver = { | |
3236 | .instance_size = sizeof(SnapshotJob), | |
3237 | .job_type = JOB_TYPE_SNAPSHOT_DELETE, | |
3238 | .run = snapshot_delete_job_run, | |
3239 | }; | |
3240 | ||
3241 | ||
3242 | void qmp_snapshot_save(const char *job_id, | |
3243 | const char *tag, | |
3244 | const char *vmstate, | |
3245 | strList *devices, | |
3246 | Error **errp) | |
3247 | { | |
3248 | SnapshotJob *s; | |
3249 | ||
3250 | s = job_create(job_id, &snapshot_save_job_driver, NULL, | |
3251 | qemu_get_aio_context(), JOB_MANUAL_DISMISS, | |
3252 | NULL, NULL, errp); | |
3253 | if (!s) { | |
3254 | return; | |
3255 | } | |
3256 | ||
3257 | s->tag = g_strdup(tag); | |
3258 | s->vmstate = g_strdup(vmstate); | |
3259 | s->devices = QAPI_CLONE(strList, devices); | |
3260 | ||
3261 | job_start(&s->common); | |
3262 | } | |
3263 | ||
3264 | void qmp_snapshot_load(const char *job_id, | |
3265 | const char *tag, | |
3266 | const char *vmstate, | |
3267 | strList *devices, | |
3268 | Error **errp) | |
3269 | { | |
3270 | SnapshotJob *s; | |
3271 | ||
3272 | s = job_create(job_id, &snapshot_load_job_driver, NULL, | |
3273 | qemu_get_aio_context(), JOB_MANUAL_DISMISS, | |
3274 | NULL, NULL, errp); | |
3275 | if (!s) { | |
3276 | return; | |
3277 | } | |
3278 | ||
3279 | s->tag = g_strdup(tag); | |
3280 | s->vmstate = g_strdup(vmstate); | |
3281 | s->devices = QAPI_CLONE(strList, devices); | |
3282 | ||
3283 | job_start(&s->common); | |
3284 | } | |
3285 | ||
3286 | void qmp_snapshot_delete(const char *job_id, | |
3287 | const char *tag, | |
3288 | strList *devices, | |
3289 | Error **errp) | |
3290 | { | |
3291 | SnapshotJob *s; | |
3292 | ||
3293 | s = job_create(job_id, &snapshot_delete_job_driver, NULL, | |
3294 | qemu_get_aio_context(), JOB_MANUAL_DISMISS, | |
3295 | NULL, NULL, errp); | |
3296 | if (!s) { | |
3297 | return; | |
3298 | } | |
3299 | ||
3300 | s->tag = g_strdup(tag); | |
3301 | s->devices = QAPI_CLONE(strList, devices); | |
3302 | ||
3303 | job_start(&s->common); | |
3304 | } |