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qapi: fix input visitor bugs
[qemu/qmp-unstable.git] / savevm.c
blob6cbdaacacd4f722a88664b8057bd9a69386d2297
1 /*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "config-host.h"
26 #include "qemu-common.h"
27 #include "hw/hw.h"
28 #include "hw/qdev.h"
29 #include "net/net.h"
30 #include "monitor/monitor.h"
31 #include "sysemu/sysemu.h"
32 #include "qemu/timer.h"
33 #include "audio/audio.h"
34 #include "migration/migration.h"
35 #include "qemu/sockets.h"
36 #include "qemu/queue.h"
37 #include "sysemu/cpus.h"
38 #include "exec/memory.h"
39 #include "qmp-commands.h"
40 #include "trace.h"
41 #include "qemu/iov.h"
42 #include "block/snapshot.h"
43 #include "block/qapi.h"
44
45
46 #ifndef ETH_P_RARP
47 #define ETH_P_RARP 0x8035
48 #endif
49 #define ARP_HTYPE_ETH 0x0001
50 #define ARP_PTYPE_IP 0x0800
51 #define ARP_OP_REQUEST_REV 0x3
52
53 static int announce_self_create(uint8_t *buf,
54 uint8_t *mac_addr)
55 {
56 /* Ethernet header. */
57 memset(buf, 0xff, 6); /* destination MAC addr */
58 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
59 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
60
61 /* RARP header. */
62 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
63 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
64 *(buf + 18) = 6; /* hardware addr length (ethernet) */
65 *(buf + 19) = 4; /* protocol addr length (IPv4) */
66 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
67 memcpy(buf + 22, mac_addr, 6); /* source hw addr */
68 memset(buf + 28, 0x00, 4); /* source protocol addr */
69 memcpy(buf + 32, mac_addr, 6); /* target hw addr */
70 memset(buf + 38, 0x00, 4); /* target protocol addr */
71
72 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
73 memset(buf + 42, 0x00, 18);
74
75 return 60; /* len (FCS will be added by hardware) */
76 }
77
78 static void qemu_announce_self_iter(NICState *nic, void *opaque)
79 {
80 uint8_t buf[60];
81 int len;
82
83 trace_qemu_announce_self_iter(qemu_ether_ntoa(&nic->conf->macaddr));
84 len = announce_self_create(buf, nic->conf->macaddr.a);
85
86 qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
87 }
88
89
90 static void qemu_announce_self_once(void *opaque)
91 {
92 static int count = SELF_ANNOUNCE_ROUNDS;
93 QEMUTimer *timer = *(QEMUTimer **)opaque;
94
95 qemu_foreach_nic(qemu_announce_self_iter, NULL);
96
97 if (--count) {
98 /* delay 50ms, 150ms, 250ms, ... */
99 timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) +
100 self_announce_delay(count));
101 } else {
102 timer_del(timer);
103 timer_free(timer);
104 }
105 }
106
107 void qemu_announce_self(void)
108 {
109 static QEMUTimer *timer;
110 timer = timer_new_ms(QEMU_CLOCK_REALTIME, qemu_announce_self_once, &timer);
111 qemu_announce_self_once(&timer);
112 }
113
114 /***********************************************************/
115 /* savevm/loadvm support */
116
117 static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
118 int64_t pos)
119 {
120 int ret;
121 QEMUIOVector qiov;
122
123 qemu_iovec_init_external(&qiov, iov, iovcnt);
124 ret = bdrv_writev_vmstate(opaque, &qiov, pos);
125 if (ret < 0) {
126 return ret;
127 }
128
129 return qiov.size;
130 }
131
132 static int block_put_buffer(void *opaque, const uint8_t *buf,
133 int64_t pos, int size)
134 {
135 bdrv_save_vmstate(opaque, buf, pos, size);
136 return size;
137 }
138
139 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
140 {
141 return bdrv_load_vmstate(opaque, buf, pos, size);
142 }
143
144 static int bdrv_fclose(void *opaque)
145 {
146 return bdrv_flush(opaque);
147 }
148
149 static const QEMUFileOps bdrv_read_ops = {
150 .get_buffer = block_get_buffer,
151 .close = bdrv_fclose
152 };
153
154 static const QEMUFileOps bdrv_write_ops = {
155 .put_buffer = block_put_buffer,
156 .writev_buffer = block_writev_buffer,
157 .close = bdrv_fclose
158 };
159
160 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
161 {
162 if (is_writable) {
163 return qemu_fopen_ops(bs, &bdrv_write_ops);
164 }
165 return qemu_fopen_ops(bs, &bdrv_read_ops);
166 }
167
168
169 /* QEMUFile timer support.
170 * Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c
171 */
172
173 void timer_put(QEMUFile *f, QEMUTimer *ts)
174 {
175 uint64_t expire_time;
176
177 expire_time = timer_expire_time_ns(ts);
178 qemu_put_be64(f, expire_time);
179 }
180
181 void timer_get(QEMUFile *f, QEMUTimer *ts)
182 {
183 uint64_t expire_time;
184
185 expire_time = qemu_get_be64(f);
186 if (expire_time != -1) {
187 timer_mod_ns(ts, expire_time);
188 } else {
189 timer_del(ts);
190 }
191 }
192
193
194 /* VMState timer support.
195 * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c
196 */
197
198 static int get_timer(QEMUFile *f, void *pv, size_t size)
199 {
200 QEMUTimer *v = pv;
201 timer_get(f, v);
202 return 0;
203 }
204
205 static void put_timer(QEMUFile *f, void *pv, size_t size)
206 {
207 QEMUTimer *v = pv;
208 timer_put(f, v);
209 }
210
211 const VMStateInfo vmstate_info_timer = {
212 .name = "timer",
213 .get = get_timer,
214 .put = put_timer,
215 };
216
217
218 typedef struct CompatEntry {
219 char idstr[256];
220 int instance_id;
221 } CompatEntry;
222
223 typedef struct SaveStateEntry {
224 QTAILQ_ENTRY(SaveStateEntry) entry;
225 char idstr[256];
226 int instance_id;
227 int alias_id;
228 int version_id;
229 int section_id;
230 SaveVMHandlers *ops;
231 const VMStateDescription *vmsd;
232 void *opaque;
233 CompatEntry *compat;
234 int no_migrate;
235 int is_ram;
236 } SaveStateEntry;
237
238
239 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
240 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
241 static int global_section_id;
242
243 static int calculate_new_instance_id(const char *idstr)
244 {
245 SaveStateEntry *se;
246 int instance_id = 0;
247
248 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
249 if (strcmp(idstr, se->idstr) == 0
250 && instance_id <= se->instance_id) {
251 instance_id = se->instance_id + 1;
252 }
253 }
254 return instance_id;
255 }
256
257 static int calculate_compat_instance_id(const char *idstr)
258 {
259 SaveStateEntry *se;
260 int instance_id = 0;
261
262 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
263 if (!se->compat) {
264 continue;
265 }
266
267 if (strcmp(idstr, se->compat->idstr) == 0
268 && instance_id <= se->compat->instance_id) {
269 instance_id = se->compat->instance_id + 1;
270 }
271 }
272 return instance_id;
273 }
274
275 /* TODO: Individual devices generally have very little idea about the rest
276 of the system, so instance_id should be removed/replaced.
277 Meanwhile pass -1 as instance_id if you do not already have a clearly
278 distinguishing id for all instances of your device class. */
279 int register_savevm_live(DeviceState *dev,
280 const char *idstr,
281 int instance_id,
282 int version_id,
283 SaveVMHandlers *ops,
284 void *opaque)
285 {
286 SaveStateEntry *se;
287
288 se = g_malloc0(sizeof(SaveStateEntry));
289 se->version_id = version_id;
290 se->section_id = global_section_id++;
291 se->ops = ops;
292 se->opaque = opaque;
293 se->vmsd = NULL;
294 se->no_migrate = 0;
295 /* if this is a live_savem then set is_ram */
296 if (ops->save_live_setup != NULL) {
297 se->is_ram = 1;
298 }
299
300 if (dev) {
301 char *id = qdev_get_dev_path(dev);
302 if (id) {
303 pstrcpy(se->idstr, sizeof(se->idstr), id);
304 pstrcat(se->idstr, sizeof(se->idstr), "/");
305 g_free(id);
306
307 se->compat = g_malloc0(sizeof(CompatEntry));
308 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
309 se->compat->instance_id = instance_id == -1 ?
310 calculate_compat_instance_id(idstr) : instance_id;
311 instance_id = -1;
312 }
313 }
314 pstrcat(se->idstr, sizeof(se->idstr), idstr);
315
316 if (instance_id == -1) {
317 se->instance_id = calculate_new_instance_id(se->idstr);
318 } else {
319 se->instance_id = instance_id;
320 }
321 assert(!se->compat || se->instance_id == 0);
322 /* add at the end of list */
323 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
324 return 0;
325 }
326
327 int register_savevm(DeviceState *dev,
328 const char *idstr,
329 int instance_id,
330 int version_id,
331 SaveStateHandler *save_state,
332 LoadStateHandler *load_state,
333 void *opaque)
334 {
335 SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
336 ops->save_state = save_state;
337 ops->load_state = load_state;
338 return register_savevm_live(dev, idstr, instance_id, version_id,
339 ops, opaque);
340 }
341
342 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
343 {
344 SaveStateEntry *se, *new_se;
345 char id[256] = "";
346
347 if (dev) {
348 char *path = qdev_get_dev_path(dev);
349 if (path) {
350 pstrcpy(id, sizeof(id), path);
351 pstrcat(id, sizeof(id), "/");
352 g_free(path);
353 }
354 }
355 pstrcat(id, sizeof(id), idstr);
356
357 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
358 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
359 QTAILQ_REMOVE(&savevm_handlers, se, entry);
360 if (se->compat) {
361 g_free(se->compat);
362 }
363 g_free(se->ops);
364 g_free(se);
365 }
366 }
367 }
368
369 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
370 const VMStateDescription *vmsd,
371 void *opaque, int alias_id,
372 int required_for_version)
373 {
374 SaveStateEntry *se;
375
376 /* If this triggers, alias support can be dropped for the vmsd. */
377 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
378
379 se = g_malloc0(sizeof(SaveStateEntry));
380 se->version_id = vmsd->version_id;
381 se->section_id = global_section_id++;
382 se->opaque = opaque;
383 se->vmsd = vmsd;
384 se->alias_id = alias_id;
385 se->no_migrate = vmsd->unmigratable;
386
387 if (dev) {
388 char *id = qdev_get_dev_path(dev);
389 if (id) {
390 pstrcpy(se->idstr, sizeof(se->idstr), id);
391 pstrcat(se->idstr, sizeof(se->idstr), "/");
392 g_free(id);
393
394 se->compat = g_malloc0(sizeof(CompatEntry));
395 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
396 se->compat->instance_id = instance_id == -1 ?
397 calculate_compat_instance_id(vmsd->name) : instance_id;
398 instance_id = -1;
399 }
400 }
401 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
402
403 if (instance_id == -1) {
404 se->instance_id = calculate_new_instance_id(se->idstr);
405 } else {
406 se->instance_id = instance_id;
407 }
408 assert(!se->compat || se->instance_id == 0);
409 /* add at the end of list */
410 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
411 return 0;
412 }
413
414 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
415 void *opaque)
416 {
417 SaveStateEntry *se, *new_se;
418
419 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
420 if (se->vmsd == vmsd && se->opaque == opaque) {
421 QTAILQ_REMOVE(&savevm_handlers, se, entry);
422 if (se->compat) {
423 g_free(se->compat);
424 }
425 g_free(se);
426 }
427 }
428 }
429
430 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
431 {
432 trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
433 if (!se->vmsd) { /* Old style */
434 return se->ops->load_state(f, se->opaque, version_id);
435 }
436 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
437 }
438
439 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
440 {
441 trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
442 if (!se->vmsd) { /* Old style */
443 se->ops->save_state(f, se->opaque);
444 return;
445 }
446 vmstate_save_state(f, se->vmsd, se->opaque);
447 }
448
449 bool qemu_savevm_state_blocked(Error **errp)
450 {
451 SaveStateEntry *se;
452
453 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
454 if (se->no_migrate) {
455 error_setg(errp, "State blocked by non-migratable device '%s'",
456 se->idstr);
457 return true;
458 }
459 }
460 return false;
461 }
462
463 void qemu_savevm_state_begin(QEMUFile *f,
464 const MigrationParams *params)
465 {
466 SaveStateEntry *se;
467 int ret;
468
469 trace_savevm_state_begin();
470 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
471 if (!se->ops || !se->ops->set_params) {
472 continue;
473 }
474 se->ops->set_params(params, se->opaque);
475 }
476
477 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
478 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
479
480 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
481 int len;
482
483 if (!se->ops || !se->ops->save_live_setup) {
484 continue;
485 }
486 if (se->ops && se->ops->is_active) {
487 if (!se->ops->is_active(se->opaque)) {
488 continue;
489 }
490 }
491 /* Section type */
492 qemu_put_byte(f, QEMU_VM_SECTION_START);
493 qemu_put_be32(f, se->section_id);
494
495 /* ID string */
496 len = strlen(se->idstr);
497 qemu_put_byte(f, len);
498 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
499
500 qemu_put_be32(f, se->instance_id);
501 qemu_put_be32(f, se->version_id);
502
503 ret = se->ops->save_live_setup(f, se->opaque);
504 if (ret < 0) {
505 qemu_file_set_error(f, ret);
506 break;
507 }
508 }
509 }
510
511 /*
512 * this function has three return values:
513 * negative: there was one error, and we have -errno.
514 * 0 : We haven't finished, caller have to go again
515 * 1 : We have finished, we can go to complete phase
516 */
517 int qemu_savevm_state_iterate(QEMUFile *f)
518 {
519 SaveStateEntry *se;
520 int ret = 1;
521
522 trace_savevm_state_iterate();
523 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
524 if (!se->ops || !se->ops->save_live_iterate) {
525 continue;
526 }
527 if (se->ops && se->ops->is_active) {
528 if (!se->ops->is_active(se->opaque)) {
529 continue;
530 }
531 }
532 if (qemu_file_rate_limit(f)) {
533 return 0;
534 }
535 trace_savevm_section_start(se->idstr, se->section_id);
536 /* Section type */
537 qemu_put_byte(f, QEMU_VM_SECTION_PART);
538 qemu_put_be32(f, se->section_id);
539
540 ret = se->ops->save_live_iterate(f, se->opaque);
541 trace_savevm_section_end(se->idstr, se->section_id);
542
543 if (ret < 0) {
544 qemu_file_set_error(f, ret);
545 }
546 if (ret <= 0) {
547 /* Do not proceed to the next vmstate before this one reported
548 completion of the current stage. This serializes the migration
549 and reduces the probability that a faster changing state is
550 synchronized over and over again. */
551 break;
552 }
553 }
554 return ret;
555 }
556
557 void qemu_savevm_state_complete(QEMUFile *f)
558 {
559 SaveStateEntry *se;
560 int ret;
561
562 trace_savevm_state_complete();
563
564 cpu_synchronize_all_states();
565
566 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
567 if (!se->ops || !se->ops->save_live_complete) {
568 continue;
569 }
570 if (se->ops && se->ops->is_active) {
571 if (!se->ops->is_active(se->opaque)) {
572 continue;
573 }
574 }
575 trace_savevm_section_start(se->idstr, se->section_id);
576 /* Section type */
577 qemu_put_byte(f, QEMU_VM_SECTION_END);
578 qemu_put_be32(f, se->section_id);
579
580 ret = se->ops->save_live_complete(f, se->opaque);
581 trace_savevm_section_end(se->idstr, se->section_id);
582 if (ret < 0) {
583 qemu_file_set_error(f, ret);
584 return;
585 }
586 }
587
588 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
589 int len;
590
591 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
592 continue;
593 }
594 trace_savevm_section_start(se->idstr, se->section_id);
595 /* Section type */
596 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
597 qemu_put_be32(f, se->section_id);
598
599 /* ID string */
600 len = strlen(se->idstr);
601 qemu_put_byte(f, len);
602 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
603
604 qemu_put_be32(f, se->instance_id);
605 qemu_put_be32(f, se->version_id);
606
607 vmstate_save(f, se);
608 trace_savevm_section_end(se->idstr, se->section_id);
609 }
610
611 qemu_put_byte(f, QEMU_VM_EOF);
612 qemu_fflush(f);
613 }
614
615 uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
616 {
617 SaveStateEntry *se;
618 uint64_t ret = 0;
619
620 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
621 if (!se->ops || !se->ops->save_live_pending) {
622 continue;
623 }
624 if (se->ops && se->ops->is_active) {
625 if (!se->ops->is_active(se->opaque)) {
626 continue;
627 }
628 }
629 ret += se->ops->save_live_pending(f, se->opaque, max_size);
630 }
631 return ret;
632 }
633
634 void qemu_savevm_state_cancel(void)
635 {
636 SaveStateEntry *se;
637
638 trace_savevm_state_cancel();
639 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
640 if (se->ops && se->ops->cancel) {
641 se->ops->cancel(se->opaque);
642 }
643 }
644 }
645
646 static int qemu_savevm_state(QEMUFile *f)
647 {
648 int ret;
649 MigrationParams params = {
650 .blk = 0,
651 .shared = 0
652 };
653
654 if (qemu_savevm_state_blocked(NULL)) {
655 return -EINVAL;
656 }
657
658 qemu_mutex_unlock_iothread();
659 qemu_savevm_state_begin(f, &params);
660 qemu_mutex_lock_iothread();
661
662 while (qemu_file_get_error(f) == 0) {
663 if (qemu_savevm_state_iterate(f) > 0) {
664 break;
665 }
666 }
667
668 ret = qemu_file_get_error(f);
669 if (ret == 0) {
670 qemu_savevm_state_complete(f);
671 ret = qemu_file_get_error(f);
672 }
673 if (ret != 0) {
674 qemu_savevm_state_cancel();
675 }
676 return ret;
677 }
678
679 static int qemu_save_device_state(QEMUFile *f)
680 {
681 SaveStateEntry *se;
682
683 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
684 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
685
686 cpu_synchronize_all_states();
687
688 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
689 int len;
690
691 if (se->is_ram) {
692 continue;
693 }
694 if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
695 continue;
696 }
697
698 /* Section type */
699 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
700 qemu_put_be32(f, se->section_id);
701
702 /* ID string */
703 len = strlen(se->idstr);
704 qemu_put_byte(f, len);
705 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
706
707 qemu_put_be32(f, se->instance_id);
708 qemu_put_be32(f, se->version_id);
709
710 vmstate_save(f, se);
711 }
712
713 qemu_put_byte(f, QEMU_VM_EOF);
714
715 return qemu_file_get_error(f);
716 }
717
718 static SaveStateEntry *find_se(const char *idstr, int instance_id)
719 {
720 SaveStateEntry *se;
721
722 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
723 if (!strcmp(se->idstr, idstr) &&
724 (instance_id == se->instance_id ||
725 instance_id == se->alias_id))
726 return se;
727 /* Migrating from an older version? */
728 if (strstr(se->idstr, idstr) && se->compat) {
729 if (!strcmp(se->compat->idstr, idstr) &&
730 (instance_id == se->compat->instance_id ||
731 instance_id == se->alias_id))
732 return se;
733 }
734 }
735 return NULL;
736 }
737
738 typedef struct LoadStateEntry {
739 QLIST_ENTRY(LoadStateEntry) entry;
740 SaveStateEntry *se;
741 int section_id;
742 int version_id;
743 } LoadStateEntry;
744
745 int qemu_loadvm_state(QEMUFile *f)
746 {
747 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
748 QLIST_HEAD_INITIALIZER(loadvm_handlers);
749 LoadStateEntry *le, *new_le;
750 uint8_t section_type;
751 unsigned int v;
752 int ret;
753
754 if (qemu_savevm_state_blocked(NULL)) {
755 return -EINVAL;
756 }
757
758 v = qemu_get_be32(f);
759 if (v != QEMU_VM_FILE_MAGIC) {
760 return -EINVAL;
761 }
762
763 v = qemu_get_be32(f);
764 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
765 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
766 return -ENOTSUP;
767 }
768 if (v != QEMU_VM_FILE_VERSION) {
769 return -ENOTSUP;
770 }
771
772 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
773 uint32_t instance_id, version_id, section_id;
774 SaveStateEntry *se;
775 char idstr[257];
776 int len;
777
778 switch (section_type) {
779 case QEMU_VM_SECTION_START:
780 case QEMU_VM_SECTION_FULL:
781 /* Read section start */
782 section_id = qemu_get_be32(f);
783 len = qemu_get_byte(f);
784 qemu_get_buffer(f, (uint8_t *)idstr, len);
785 idstr[len] = 0;
786 instance_id = qemu_get_be32(f);
787 version_id = qemu_get_be32(f);
788
789 /* Find savevm section */
790 se = find_se(idstr, instance_id);
791 if (se == NULL) {
792 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
793 ret = -EINVAL;
794 goto out;
795 }
796
797 /* Validate version */
798 if (version_id > se->version_id) {
799 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
800 version_id, idstr, se->version_id);
801 ret = -EINVAL;
802 goto out;
803 }
804
805 /* Add entry */
806 le = g_malloc0(sizeof(*le));
807
808 le->se = se;
809 le->section_id = section_id;
810 le->version_id = version_id;
811 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
812
813 ret = vmstate_load(f, le->se, le->version_id);
814 if (ret < 0) {
815 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
816 instance_id, idstr);
817 goto out;
818 }
819 break;
820 case QEMU_VM_SECTION_PART:
821 case QEMU_VM_SECTION_END:
822 section_id = qemu_get_be32(f);
823
824 QLIST_FOREACH(le, &loadvm_handlers, entry) {
825 if (le->section_id == section_id) {
826 break;
827 }
828 }
829 if (le == NULL) {
830 fprintf(stderr, "Unknown savevm section %d\n", section_id);
831 ret = -EINVAL;
832 goto out;
833 }
834
835 ret = vmstate_load(f, le->se, le->version_id);
836 if (ret < 0) {
837 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
838 section_id);
839 goto out;
840 }
841 break;
842 default:
843 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
844 ret = -EINVAL;
845 goto out;
846 }
847 }
848
849 cpu_synchronize_all_post_init();
850
851 ret = 0;
852
853 out:
854 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
855 QLIST_REMOVE(le, entry);
856 g_free(le);
857 }
858
859 if (ret == 0) {
860 ret = qemu_file_get_error(f);
861 }
862
863 return ret;
864 }
865
866 static BlockDriverState *find_vmstate_bs(void)
867 {
868 BlockDriverState *bs = NULL;
869 while ((bs = bdrv_next(bs))) {
870 if (bdrv_can_snapshot(bs)) {
871 return bs;
872 }
873 }
874 return NULL;
875 }
876
877 /*
878 * Deletes snapshots of a given name in all opened images.
879 */
880 static int del_existing_snapshots(Monitor *mon, const char *name)
881 {
882 BlockDriverState *bs;
883 QEMUSnapshotInfo sn1, *snapshot = &sn1;
884 Error *err = NULL;
885
886 bs = NULL;
887 while ((bs = bdrv_next(bs))) {
888 if (bdrv_can_snapshot(bs) &&
889 bdrv_snapshot_find(bs, snapshot, name) >= 0) {
890 bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
891 if (err) {
892 monitor_printf(mon,
893 "Error while deleting snapshot on device '%s':"
894 " %s\n",
895 bdrv_get_device_name(bs),
896 error_get_pretty(err));
897 error_free(err);
898 return -1;
899 }
900 }
901 }
902
903 return 0;
904 }
905
906 void do_savevm(Monitor *mon, const QDict *qdict)
907 {
908 BlockDriverState *bs, *bs1;
909 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
910 int ret;
911 QEMUFile *f;
912 int saved_vm_running;
913 uint64_t vm_state_size;
914 qemu_timeval tv;
915 struct tm tm;
916 const char *name = qdict_get_try_str(qdict, "name");
917
918 /* Verify if there is a device that doesn't support snapshots and is writable */
919 bs = NULL;
920 while ((bs = bdrv_next(bs))) {
921
922 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
923 continue;
924 }
925
926 if (!bdrv_can_snapshot(bs)) {
927 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
928 bdrv_get_device_name(bs));
929 return;
930 }
931 }
932
933 bs = find_vmstate_bs();
934 if (!bs) {
935 monitor_printf(mon, "No block device can accept snapshots\n");
936 return;
937 }
938
939 saved_vm_running = runstate_is_running();
940 vm_stop(RUN_STATE_SAVE_VM);
941
942 memset(sn, 0, sizeof(*sn));
943
944 /* fill auxiliary fields */
945 qemu_gettimeofday(&tv);
946 sn->date_sec = tv.tv_sec;
947 sn->date_nsec = tv.tv_usec * 1000;
948 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
949
950 if (name) {
951 ret = bdrv_snapshot_find(bs, old_sn, name);
952 if (ret >= 0) {
953 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
954 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
955 } else {
956 pstrcpy(sn->name, sizeof(sn->name), name);
957 }
958 } else {
959 /* cast below needed for OpenBSD where tv_sec is still 'long' */
960 localtime_r((const time_t *)&tv.tv_sec, &tm);
961 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
962 }
963
964 /* Delete old snapshots of the same name */
965 if (name && del_existing_snapshots(mon, name) < 0) {
966 goto the_end;
967 }
968
969 /* save the VM state */
970 f = qemu_fopen_bdrv(bs, 1);
971 if (!f) {
972 monitor_printf(mon, "Could not open VM state file\n");
973 goto the_end;
974 }
975 ret = qemu_savevm_state(f);
976 vm_state_size = qemu_ftell(f);
977 qemu_fclose(f);
978 if (ret < 0) {
979 monitor_printf(mon, "Error %d while writing VM\n", ret);
980 goto the_end;
981 }
982
983 /* create the snapshots */
984
985 bs1 = NULL;
986 while ((bs1 = bdrv_next(bs1))) {
987 if (bdrv_can_snapshot(bs1)) {
988 /* Write VM state size only to the image that contains the state */
989 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
990 ret = bdrv_snapshot_create(bs1, sn);
991 if (ret < 0) {
992 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
993 bdrv_get_device_name(bs1));
994 }
995 }
996 }
997
998 the_end:
999 if (saved_vm_running) {
1000 vm_start();
1001 }
1002 }
1003
1004 void qmp_xen_save_devices_state(const char *filename, Error **errp)
1005 {
1006 QEMUFile *f;
1007 int saved_vm_running;
1008 int ret;
1009
1010 saved_vm_running = runstate_is_running();
1011 vm_stop(RUN_STATE_SAVE_VM);
1012
1013 f = qemu_fopen(filename, "wb");
1014 if (!f) {
1015 error_setg_file_open(errp, errno, filename);
1016 goto the_end;
1017 }
1018 ret = qemu_save_device_state(f);
1019 qemu_fclose(f);
1020 if (ret < 0) {
1021 error_set(errp, QERR_IO_ERROR);
1022 }
1023
1024 the_end:
1025 if (saved_vm_running) {
1026 vm_start();
1027 }
1028 }
1029
1030 int load_vmstate(const char *name)
1031 {
1032 BlockDriverState *bs, *bs_vm_state;
1033 QEMUSnapshotInfo sn;
1034 QEMUFile *f;
1035 int ret;
1036
1037 bs_vm_state = find_vmstate_bs();
1038 if (!bs_vm_state) {
1039 error_report("No block device supports snapshots");
1040 return -ENOTSUP;
1041 }
1042
1043 /* Don't even try to load empty VM states */
1044 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
1045 if (ret < 0) {
1046 return ret;
1047 } else if (sn.vm_state_size == 0) {
1048 error_report("This is a disk-only snapshot. Revert to it offline "
1049 "using qemu-img.");
1050 return -EINVAL;
1051 }
1052
1053 /* Verify if there is any device that doesn't support snapshots and is
1054 writable and check if the requested snapshot is available too. */
1055 bs = NULL;
1056 while ((bs = bdrv_next(bs))) {
1057
1058 if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
1059 continue;
1060 }
1061
1062 if (!bdrv_can_snapshot(bs)) {
1063 error_report("Device '%s' is writable but does not support snapshots.",
1064 bdrv_get_device_name(bs));
1065 return -ENOTSUP;
1066 }
1067
1068 ret = bdrv_snapshot_find(bs, &sn, name);
1069 if (ret < 0) {
1070 error_report("Device '%s' does not have the requested snapshot '%s'",
1071 bdrv_get_device_name(bs), name);
1072 return ret;
1073 }
1074 }
1075
1076 /* Flush all IO requests so they don't interfere with the new state. */
1077 bdrv_drain_all();
1078
1079 bs = NULL;
1080 while ((bs = bdrv_next(bs))) {
1081 if (bdrv_can_snapshot(bs)) {
1082 ret = bdrv_snapshot_goto(bs, name);
1083 if (ret < 0) {
1084 error_report("Error %d while activating snapshot '%s' on '%s'",
1085 ret, name, bdrv_get_device_name(bs));
1086 return ret;
1087 }
1088 }
1089 }
1090
1091 /* restore the VM state */
1092 f = qemu_fopen_bdrv(bs_vm_state, 0);
1093 if (!f) {
1094 error_report("Could not open VM state file");
1095 return -EINVAL;
1096 }
1097
1098 qemu_system_reset(VMRESET_SILENT);
1099 ret = qemu_loadvm_state(f);
1100
1101 qemu_fclose(f);
1102 if (ret < 0) {
1103 error_report("Error %d while loading VM state", ret);
1104 return ret;
1105 }
1106
1107 return 0;
1108 }
1109
1110 void do_delvm(Monitor *mon, const QDict *qdict)
1111 {
1112 BlockDriverState *bs, *bs1;
1113 Error *err = NULL;
1114 const char *name = qdict_get_str(qdict, "name");
1115
1116 bs = find_vmstate_bs();
1117 if (!bs) {
1118 monitor_printf(mon, "No block device supports snapshots\n");
1119 return;
1120 }
1121
1122 bs1 = NULL;
1123 while ((bs1 = bdrv_next(bs1))) {
1124 if (bdrv_can_snapshot(bs1)) {
1125 bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
1126 if (err) {
1127 monitor_printf(mon,
1128 "Error while deleting snapshot on device '%s':"
1129 " %s\n",
1130 bdrv_get_device_name(bs),
1131 error_get_pretty(err));
1132 error_free(err);
1133 }
1134 }
1135 }
1136 }
1137
1138 void do_info_snapshots(Monitor *mon, const QDict *qdict)
1139 {
1140 BlockDriverState *bs, *bs1;
1141 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
1142 int nb_sns, i, ret, available;
1143 int total;
1144 int *available_snapshots;
1145
1146 bs = find_vmstate_bs();
1147 if (!bs) {
1148 monitor_printf(mon, "No available block device supports snapshots\n");
1149 return;
1150 }
1151
1152 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1153 if (nb_sns < 0) {
1154 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1155 return;
1156 }
1157
1158 if (nb_sns == 0) {
1159 monitor_printf(mon, "There is no snapshot available.\n");
1160 return;
1161 }
1162
1163 available_snapshots = g_malloc0(sizeof(int) * nb_sns);
1164 total = 0;
1165 for (i = 0; i < nb_sns; i++) {
1166 sn = &sn_tab[i];
1167 available = 1;
1168 bs1 = NULL;
1169
1170 while ((bs1 = bdrv_next(bs1))) {
1171 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
1172 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
1173 if (ret < 0) {
1174 available = 0;
1175 break;
1176 }
1177 }
1178 }
1179
1180 if (available) {
1181 available_snapshots[total] = i;
1182 total++;
1183 }
1184 }
1185
1186 if (total > 0) {
1187 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL);
1188 monitor_printf(mon, "\n");
1189 for (i = 0; i < total; i++) {
1190 sn = &sn_tab[available_snapshots[i]];
1191 bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn);
1192 monitor_printf(mon, "\n");
1193 }
1194 } else {
1195 monitor_printf(mon, "There is no suitable snapshot available\n");
1196 }
1197
1198 g_free(sn_tab);
1199 g_free(available_snapshots);
1200
1201 }
1202
1203 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
1204 {
1205 qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
1206 memory_region_name(mr), dev);
1207 }
1208
1209 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
1210 {
1211 qemu_ram_unset_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK);
1212 }
1213
1214 void vmstate_register_ram_global(MemoryRegion *mr)
1215 {
1216 vmstate_register_ram(mr, NULL);
1217 }
QEMU Monitor Protocol