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migration: Accept 'cont' only after successful incoming migration
[qemu.git] / savevm.c
blob4c0e5d3b102fbe59533040b5c664f54083da7fb7
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 #include <unistd.h>
25 #include <fcntl.h>
26 #include <signal.h>
27 #include <time.h>
28 #include <errno.h>
29 #include <sys/time.h>
30 #include <zlib.h>
31
32 /* Needed early for CONFIG_BSD etc. */
33 #include "config-host.h"
34
35 #ifndef _WIN32
36 #include <sys/times.h>
37 #include <sys/wait.h>
38 #include <termios.h>
39 #include <sys/mman.h>
40 #include <sys/ioctl.h>
41 #include <sys/resource.h>
42 #include <sys/socket.h>
43 #include <netinet/in.h>
44 #include <net/if.h>
45 #include <arpa/inet.h>
46 #include <dirent.h>
47 #include <netdb.h>
48 #include <sys/select.h>
49 #ifdef CONFIG_BSD
50 #include <sys/stat.h>
51 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
52 #include <libutil.h>
53 #else
54 #include <util.h>
55 #endif
56 #ifdef __linux__
57 #include <pty.h>
58 #include <malloc.h>
59 #include <linux/rtc.h>
60 #endif
61 #endif
62 #endif
63
64 #ifdef _WIN32
65 #include <windows.h>
66 #include <malloc.h>
67 #include <sys/timeb.h>
68 #include <mmsystem.h>
69 #define getopt_long_only getopt_long
70 #define memalign(align, size) malloc(size)
71 #endif
72
73 #include "qemu-common.h"
74 #include "hw/hw.h"
75 #include "hw/qdev.h"
76 #include "net.h"
77 #include "monitor.h"
78 #include "sysemu.h"
79 #include "qemu-timer.h"
80 #include "qemu-char.h"
81 #include "blockdev.h"
82 #include "audio/audio.h"
83 #include "migration.h"
84 #include "qemu_socket.h"
85 #include "qemu-queue.h"
86
87 #define SELF_ANNOUNCE_ROUNDS 5
88
89 #ifndef ETH_P_RARP
90 #define ETH_P_RARP 0x8035
91 #endif
92 #define ARP_HTYPE_ETH 0x0001
93 #define ARP_PTYPE_IP 0x0800
94 #define ARP_OP_REQUEST_REV 0x3
95
96 static int announce_self_create(uint8_t *buf,
97 uint8_t *mac_addr)
98 {
99 /* Ethernet header. */
100 memset(buf, 0xff, 6); /* destination MAC addr */
101 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
102 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
103
104 /* RARP header. */
105 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
106 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
107 *(buf + 18) = 6; /* hardware addr length (ethernet) */
108 *(buf + 19) = 4; /* protocol addr length (IPv4) */
109 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
110 memcpy(buf + 22, mac_addr, 6); /* source hw addr */
111 memset(buf + 28, 0x00, 4); /* source protocol addr */
112 memcpy(buf + 32, mac_addr, 6); /* target hw addr */
113 memset(buf + 38, 0x00, 4); /* target protocol addr */
114
115 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
116 memset(buf + 42, 0x00, 18);
117
118 return 60; /* len (FCS will be added by hardware) */
119 }
120
121 static void qemu_announce_self_iter(NICState *nic, void *opaque)
122 {
123 uint8_t buf[60];
124 int len;
125
126 len = announce_self_create(buf, nic->conf->macaddr.a);
127
128 qemu_send_packet_raw(&nic->nc, buf, len);
129 }
130
131
132 static void qemu_announce_self_once(void *opaque)
133 {
134 static int count = SELF_ANNOUNCE_ROUNDS;
135 QEMUTimer *timer = *(QEMUTimer **)opaque;
136
137 qemu_foreach_nic(qemu_announce_self_iter, NULL);
138
139 if (--count) {
140 /* delay 50ms, 150ms, 250ms, ... */
141 qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
142 50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
143 } else {
144 qemu_del_timer(timer);
145 qemu_free_timer(timer);
146 }
147 }
148
149 void qemu_announce_self(void)
150 {
151 static QEMUTimer *timer;
152 timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
153 qemu_announce_self_once(&timer);
154 }
155
156 /***********************************************************/
157 /* savevm/loadvm support */
158
159 #define IO_BUF_SIZE 32768
160
161 struct QEMUFile {
162 QEMUFilePutBufferFunc *put_buffer;
163 QEMUFileGetBufferFunc *get_buffer;
164 QEMUFileCloseFunc *close;
165 QEMUFileRateLimit *rate_limit;
166 QEMUFileSetRateLimit *set_rate_limit;
167 QEMUFileGetRateLimit *get_rate_limit;
168 void *opaque;
169 int is_write;
170
171 int64_t buf_offset; /* start of buffer when writing, end of buffer
172 when reading */
173 int buf_index;
174 int buf_size; /* 0 when writing */
175 uint8_t buf[IO_BUF_SIZE];
176
177 int has_error;
178 };
179
180 typedef struct QEMUFileStdio
181 {
182 FILE *stdio_file;
183 QEMUFile *file;
184 } QEMUFileStdio;
185
186 typedef struct QEMUFileSocket
187 {
188 int fd;
189 QEMUFile *file;
190 } QEMUFileSocket;
191
192 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
193 {
194 QEMUFileSocket *s = opaque;
195 ssize_t len;
196
197 do {
198 len = recv(s->fd, (void *)buf, size, 0);
199 } while (len == -1 && socket_error() == EINTR);
200
201 if (len == -1)
202 len = -socket_error();
203
204 return len;
205 }
206
207 static int socket_close(void *opaque)
208 {
209 QEMUFileSocket *s = opaque;
210 qemu_free(s);
211 return 0;
212 }
213
214 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
215 {
216 QEMUFileStdio *s = opaque;
217 return fwrite(buf, 1, size, s->stdio_file);
218 }
219
220 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
221 {
222 QEMUFileStdio *s = opaque;
223 FILE *fp = s->stdio_file;
224 int bytes;
225
226 do {
227 clearerr(fp);
228 bytes = fread(buf, 1, size, fp);
229 } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
230 return bytes;
231 }
232
233 static int stdio_pclose(void *opaque)
234 {
235 QEMUFileStdio *s = opaque;
236 int ret;
237 ret = pclose(s->stdio_file);
238 qemu_free(s);
239 return ret;
240 }
241
242 static int stdio_fclose(void *opaque)
243 {
244 QEMUFileStdio *s = opaque;
245 fclose(s->stdio_file);
246 qemu_free(s);
247 return 0;
248 }
249
250 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
251 {
252 QEMUFileStdio *s;
253
254 if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
255 fprintf(stderr, "qemu_popen: Argument validity check failed\n");
256 return NULL;
257 }
258
259 s = qemu_mallocz(sizeof(QEMUFileStdio));
260
261 s->stdio_file = stdio_file;
262
263 if(mode[0] == 'r') {
264 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
265 NULL, NULL, NULL);
266 } else {
267 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
268 NULL, NULL, NULL);
269 }
270 return s->file;
271 }
272
273 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
274 {
275 FILE *popen_file;
276
277 popen_file = popen(command, mode);
278 if(popen_file == NULL) {
279 return NULL;
280 }
281
282 return qemu_popen(popen_file, mode);
283 }
284
285 int qemu_stdio_fd(QEMUFile *f)
286 {
287 QEMUFileStdio *p;
288 int fd;
289
290 p = (QEMUFileStdio *)f->opaque;
291 fd = fileno(p->stdio_file);
292
293 return fd;
294 }
295
296 QEMUFile *qemu_fdopen(int fd, const char *mode)
297 {
298 QEMUFileStdio *s;
299
300 if (mode == NULL ||
301 (mode[0] != 'r' && mode[0] != 'w') ||
302 mode[1] != 'b' || mode[2] != 0) {
303 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
304 return NULL;
305 }
306
307 s = qemu_mallocz(sizeof(QEMUFileStdio));
308 s->stdio_file = fdopen(fd, mode);
309 if (!s->stdio_file)
310 goto fail;
311
312 if(mode[0] == 'r') {
313 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
314 NULL, NULL, NULL);
315 } else {
316 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
317 NULL, NULL, NULL);
318 }
319 return s->file;
320
321 fail:
322 qemu_free(s);
323 return NULL;
324 }
325
326 QEMUFile *qemu_fopen_socket(int fd)
327 {
328 QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
329
330 s->fd = fd;
331 s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
332 NULL, NULL, NULL);
333 return s->file;
334 }
335
336 static int file_put_buffer(void *opaque, const uint8_t *buf,
337 int64_t pos, int size)
338 {
339 QEMUFileStdio *s = opaque;
340 fseek(s->stdio_file, pos, SEEK_SET);
341 return fwrite(buf, 1, size, s->stdio_file);
342 }
343
344 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
345 {
346 QEMUFileStdio *s = opaque;
347 fseek(s->stdio_file, pos, SEEK_SET);
348 return fread(buf, 1, size, s->stdio_file);
349 }
350
351 QEMUFile *qemu_fopen(const char *filename, const char *mode)
352 {
353 QEMUFileStdio *s;
354
355 if (mode == NULL ||
356 (mode[0] != 'r' && mode[0] != 'w') ||
357 mode[1] != 'b' || mode[2] != 0) {
358 fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
359 return NULL;
360 }
361
362 s = qemu_mallocz(sizeof(QEMUFileStdio));
363
364 s->stdio_file = fopen(filename, mode);
365 if (!s->stdio_file)
366 goto fail;
367
368 if(mode[0] == 'w') {
369 s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
370 NULL, NULL, NULL);
371 } else {
372 s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
373 NULL, NULL, NULL);
374 }
375 return s->file;
376 fail:
377 qemu_free(s);
378 return NULL;
379 }
380
381 static int block_put_buffer(void *opaque, const uint8_t *buf,
382 int64_t pos, int size)
383 {
384 bdrv_save_vmstate(opaque, buf, pos, size);
385 return size;
386 }
387
388 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
389 {
390 return bdrv_load_vmstate(opaque, buf, pos, size);
391 }
392
393 static int bdrv_fclose(void *opaque)
394 {
395 return 0;
396 }
397
398 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
399 {
400 if (is_writable)
401 return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
402 NULL, NULL, NULL);
403 return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
404 }
405
406 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
407 QEMUFileGetBufferFunc *get_buffer,
408 QEMUFileCloseFunc *close,
409 QEMUFileRateLimit *rate_limit,
410 QEMUFileSetRateLimit *set_rate_limit,
411 QEMUFileGetRateLimit *get_rate_limit)
412 {
413 QEMUFile *f;
414
415 f = qemu_mallocz(sizeof(QEMUFile));
416
417 f->opaque = opaque;
418 f->put_buffer = put_buffer;
419 f->get_buffer = get_buffer;
420 f->close = close;
421 f->rate_limit = rate_limit;
422 f->set_rate_limit = set_rate_limit;
423 f->get_rate_limit = get_rate_limit;
424 f->is_write = 0;
425
426 return f;
427 }
428
429 int qemu_file_has_error(QEMUFile *f)
430 {
431 return f->has_error;
432 }
433
434 void qemu_file_set_error(QEMUFile *f)
435 {
436 f->has_error = 1;
437 }
438
439 void qemu_fflush(QEMUFile *f)
440 {
441 if (!f->put_buffer)
442 return;
443
444 if (f->is_write && f->buf_index > 0) {
445 int len;
446
447 len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
448 if (len > 0)
449 f->buf_offset += f->buf_index;
450 else
451 f->has_error = 1;
452 f->buf_index = 0;
453 }
454 }
455
456 static void qemu_fill_buffer(QEMUFile *f)
457 {
458 int len;
459
460 if (!f->get_buffer)
461 return;
462
463 if (f->is_write)
464 abort();
465
466 len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
467 if (len > 0) {
468 f->buf_index = 0;
469 f->buf_size = len;
470 f->buf_offset += len;
471 } else if (len != -EAGAIN)
472 f->has_error = 1;
473 }
474
475 int qemu_fclose(QEMUFile *f)
476 {
477 int ret = 0;
478 qemu_fflush(f);
479 if (f->close)
480 ret = f->close(f->opaque);
481 qemu_free(f);
482 return ret;
483 }
484
485 void qemu_file_put_notify(QEMUFile *f)
486 {
487 f->put_buffer(f->opaque, NULL, 0, 0);
488 }
489
490 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
491 {
492 int l;
493
494 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
495 fprintf(stderr,
496 "Attempted to write to buffer while read buffer is not empty\n");
497 abort();
498 }
499
500 while (!f->has_error && size > 0) {
501 l = IO_BUF_SIZE - f->buf_index;
502 if (l > size)
503 l = size;
504 memcpy(f->buf + f->buf_index, buf, l);
505 f->is_write = 1;
506 f->buf_index += l;
507 buf += l;
508 size -= l;
509 if (f->buf_index >= IO_BUF_SIZE)
510 qemu_fflush(f);
511 }
512 }
513
514 void qemu_put_byte(QEMUFile *f, int v)
515 {
516 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
517 fprintf(stderr,
518 "Attempted to write to buffer while read buffer is not empty\n");
519 abort();
520 }
521
522 f->buf[f->buf_index++] = v;
523 f->is_write = 1;
524 if (f->buf_index >= IO_BUF_SIZE)
525 qemu_fflush(f);
526 }
527
528 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
529 {
530 int size, l;
531
532 if (f->is_write)
533 abort();
534
535 size = size1;
536 while (size > 0) {
537 l = f->buf_size - f->buf_index;
538 if (l == 0) {
539 qemu_fill_buffer(f);
540 l = f->buf_size - f->buf_index;
541 if (l == 0)
542 break;
543 }
544 if (l > size)
545 l = size;
546 memcpy(buf, f->buf + f->buf_index, l);
547 f->buf_index += l;
548 buf += l;
549 size -= l;
550 }
551 return size1 - size;
552 }
553
554 static int qemu_peek_byte(QEMUFile *f)
555 {
556 if (f->is_write)
557 abort();
558
559 if (f->buf_index >= f->buf_size) {
560 qemu_fill_buffer(f);
561 if (f->buf_index >= f->buf_size)
562 return 0;
563 }
564 return f->buf[f->buf_index];
565 }
566
567 int qemu_get_byte(QEMUFile *f)
568 {
569 if (f->is_write)
570 abort();
571
572 if (f->buf_index >= f->buf_size) {
573 qemu_fill_buffer(f);
574 if (f->buf_index >= f->buf_size)
575 return 0;
576 }
577 return f->buf[f->buf_index++];
578 }
579
580 int64_t qemu_ftell(QEMUFile *f)
581 {
582 return f->buf_offset - f->buf_size + f->buf_index;
583 }
584
585 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
586 {
587 if (whence == SEEK_SET) {
588 /* nothing to do */
589 } else if (whence == SEEK_CUR) {
590 pos += qemu_ftell(f);
591 } else {
592 /* SEEK_END not supported */
593 return -1;
594 }
595 if (f->put_buffer) {
596 qemu_fflush(f);
597 f->buf_offset = pos;
598 } else {
599 f->buf_offset = pos;
600 f->buf_index = 0;
601 f->buf_size = 0;
602 }
603 return pos;
604 }
605
606 int qemu_file_rate_limit(QEMUFile *f)
607 {
608 if (f->rate_limit)
609 return f->rate_limit(f->opaque);
610
611 return 0;
612 }
613
614 size_t qemu_file_get_rate_limit(QEMUFile *f)
615 {
616 if (f->get_rate_limit)
617 return f->get_rate_limit(f->opaque);
618
619 return 0;
620 }
621
622 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
623 {
624 /* any failed or completed migration keeps its state to allow probing of
625 * migration data, but has no associated file anymore */
626 if (f && f->set_rate_limit)
627 return f->set_rate_limit(f->opaque, new_rate);
628
629 return 0;
630 }
631
632 void qemu_put_be16(QEMUFile *f, unsigned int v)
633 {
634 qemu_put_byte(f, v >> 8);
635 qemu_put_byte(f, v);
636 }
637
638 void qemu_put_be32(QEMUFile *f, unsigned int v)
639 {
640 qemu_put_byte(f, v >> 24);
641 qemu_put_byte(f, v >> 16);
642 qemu_put_byte(f, v >> 8);
643 qemu_put_byte(f, v);
644 }
645
646 void qemu_put_be64(QEMUFile *f, uint64_t v)
647 {
648 qemu_put_be32(f, v >> 32);
649 qemu_put_be32(f, v);
650 }
651
652 unsigned int qemu_get_be16(QEMUFile *f)
653 {
654 unsigned int v;
655 v = qemu_get_byte(f) << 8;
656 v |= qemu_get_byte(f);
657 return v;
658 }
659
660 unsigned int qemu_get_be32(QEMUFile *f)
661 {
662 unsigned int v;
663 v = qemu_get_byte(f) << 24;
664 v |= qemu_get_byte(f) << 16;
665 v |= qemu_get_byte(f) << 8;
666 v |= qemu_get_byte(f);
667 return v;
668 }
669
670 uint64_t qemu_get_be64(QEMUFile *f)
671 {
672 uint64_t v;
673 v = (uint64_t)qemu_get_be32(f) << 32;
674 v |= qemu_get_be32(f);
675 return v;
676 }
677
678 /* 8 bit int */
679
680 static int get_int8(QEMUFile *f, void *pv, size_t size)
681 {
682 int8_t *v = pv;
683 qemu_get_s8s(f, v);
684 return 0;
685 }
686
687 static void put_int8(QEMUFile *f, void *pv, size_t size)
688 {
689 int8_t *v = pv;
690 qemu_put_s8s(f, v);
691 }
692
693 const VMStateInfo vmstate_info_int8 = {
694 .name = "int8",
695 .get = get_int8,
696 .put = put_int8,
697 };
698
699 /* 16 bit int */
700
701 static int get_int16(QEMUFile *f, void *pv, size_t size)
702 {
703 int16_t *v = pv;
704 qemu_get_sbe16s(f, v);
705 return 0;
706 }
707
708 static void put_int16(QEMUFile *f, void *pv, size_t size)
709 {
710 int16_t *v = pv;
711 qemu_put_sbe16s(f, v);
712 }
713
714 const VMStateInfo vmstate_info_int16 = {
715 .name = "int16",
716 .get = get_int16,
717 .put = put_int16,
718 };
719
720 /* 32 bit int */
721
722 static int get_int32(QEMUFile *f, void *pv, size_t size)
723 {
724 int32_t *v = pv;
725 qemu_get_sbe32s(f, v);
726 return 0;
727 }
728
729 static void put_int32(QEMUFile *f, void *pv, size_t size)
730 {
731 int32_t *v = pv;
732 qemu_put_sbe32s(f, v);
733 }
734
735 const VMStateInfo vmstate_info_int32 = {
736 .name = "int32",
737 .get = get_int32,
738 .put = put_int32,
739 };
740
741 /* 32 bit int. See that the received value is the same than the one
742 in the field */
743
744 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
745 {
746 int32_t *v = pv;
747 int32_t v2;
748 qemu_get_sbe32s(f, &v2);
749
750 if (*v == v2)
751 return 0;
752 return -EINVAL;
753 }
754
755 const VMStateInfo vmstate_info_int32_equal = {
756 .name = "int32 equal",
757 .get = get_int32_equal,
758 .put = put_int32,
759 };
760
761 /* 32 bit int. See that the received value is the less or the same
762 than the one in the field */
763
764 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
765 {
766 int32_t *old = pv;
767 int32_t new;
768 qemu_get_sbe32s(f, &new);
769
770 if (*old <= new)
771 return 0;
772 return -EINVAL;
773 }
774
775 const VMStateInfo vmstate_info_int32_le = {
776 .name = "int32 equal",
777 .get = get_int32_le,
778 .put = put_int32,
779 };
780
781 /* 64 bit int */
782
783 static int get_int64(QEMUFile *f, void *pv, size_t size)
784 {
785 int64_t *v = pv;
786 qemu_get_sbe64s(f, v);
787 return 0;
788 }
789
790 static void put_int64(QEMUFile *f, void *pv, size_t size)
791 {
792 int64_t *v = pv;
793 qemu_put_sbe64s(f, v);
794 }
795
796 const VMStateInfo vmstate_info_int64 = {
797 .name = "int64",
798 .get = get_int64,
799 .put = put_int64,
800 };
801
802 /* 8 bit unsigned int */
803
804 static int get_uint8(QEMUFile *f, void *pv, size_t size)
805 {
806 uint8_t *v = pv;
807 qemu_get_8s(f, v);
808 return 0;
809 }
810
811 static void put_uint8(QEMUFile *f, void *pv, size_t size)
812 {
813 uint8_t *v = pv;
814 qemu_put_8s(f, v);
815 }
816
817 const VMStateInfo vmstate_info_uint8 = {
818 .name = "uint8",
819 .get = get_uint8,
820 .put = put_uint8,
821 };
822
823 /* 16 bit unsigned int */
824
825 static int get_uint16(QEMUFile *f, void *pv, size_t size)
826 {
827 uint16_t *v = pv;
828 qemu_get_be16s(f, v);
829 return 0;
830 }
831
832 static void put_uint16(QEMUFile *f, void *pv, size_t size)
833 {
834 uint16_t *v = pv;
835 qemu_put_be16s(f, v);
836 }
837
838 const VMStateInfo vmstate_info_uint16 = {
839 .name = "uint16",
840 .get = get_uint16,
841 .put = put_uint16,
842 };
843
844 /* 32 bit unsigned int */
845
846 static int get_uint32(QEMUFile *f, void *pv, size_t size)
847 {
848 uint32_t *v = pv;
849 qemu_get_be32s(f, v);
850 return 0;
851 }
852
853 static void put_uint32(QEMUFile *f, void *pv, size_t size)
854 {
855 uint32_t *v = pv;
856 qemu_put_be32s(f, v);
857 }
858
859 const VMStateInfo vmstate_info_uint32 = {
860 .name = "uint32",
861 .get = get_uint32,
862 .put = put_uint32,
863 };
864
865 /* 64 bit unsigned int */
866
867 static int get_uint64(QEMUFile *f, void *pv, size_t size)
868 {
869 uint64_t *v = pv;
870 qemu_get_be64s(f, v);
871 return 0;
872 }
873
874 static void put_uint64(QEMUFile *f, void *pv, size_t size)
875 {
876 uint64_t *v = pv;
877 qemu_put_be64s(f, v);
878 }
879
880 const VMStateInfo vmstate_info_uint64 = {
881 .name = "uint64",
882 .get = get_uint64,
883 .put = put_uint64,
884 };
885
886 /* 8 bit int. See that the received value is the same than the one
887 in the field */
888
889 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
890 {
891 uint8_t *v = pv;
892 uint8_t v2;
893 qemu_get_8s(f, &v2);
894
895 if (*v == v2)
896 return 0;
897 return -EINVAL;
898 }
899
900 const VMStateInfo vmstate_info_uint8_equal = {
901 .name = "uint8 equal",
902 .get = get_uint8_equal,
903 .put = put_uint8,
904 };
905
906 /* 16 bit unsigned int int. See that the received value is the same than the one
907 in the field */
908
909 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
910 {
911 uint16_t *v = pv;
912 uint16_t v2;
913 qemu_get_be16s(f, &v2);
914
915 if (*v == v2)
916 return 0;
917 return -EINVAL;
918 }
919
920 const VMStateInfo vmstate_info_uint16_equal = {
921 .name = "uint16 equal",
922 .get = get_uint16_equal,
923 .put = put_uint16,
924 };
925
926 /* timers */
927
928 static int get_timer(QEMUFile *f, void *pv, size_t size)
929 {
930 QEMUTimer *v = pv;
931 qemu_get_timer(f, v);
932 return 0;
933 }
934
935 static void put_timer(QEMUFile *f, void *pv, size_t size)
936 {
937 QEMUTimer *v = pv;
938 qemu_put_timer(f, v);
939 }
940
941 const VMStateInfo vmstate_info_timer = {
942 .name = "timer",
943 .get = get_timer,
944 .put = put_timer,
945 };
946
947 /* uint8_t buffers */
948
949 static int get_buffer(QEMUFile *f, void *pv, size_t size)
950 {
951 uint8_t *v = pv;
952 qemu_get_buffer(f, v, size);
953 return 0;
954 }
955
956 static void put_buffer(QEMUFile *f, void *pv, size_t size)
957 {
958 uint8_t *v = pv;
959 qemu_put_buffer(f, v, size);
960 }
961
962 const VMStateInfo vmstate_info_buffer = {
963 .name = "buffer",
964 .get = get_buffer,
965 .put = put_buffer,
966 };
967
968 /* unused buffers: space that was used for some fields that are
969 not usefull anymore */
970
971 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
972 {
973 uint8_t buf[1024];
974 int block_len;
975
976 while (size > 0) {
977 block_len = MIN(sizeof(buf), size);
978 size -= block_len;
979 qemu_get_buffer(f, buf, block_len);
980 }
981 return 0;
982 }
983
984 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
985 {
986 static const uint8_t buf[1024];
987 int block_len;
988
989 while (size > 0) {
990 block_len = MIN(sizeof(buf), size);
991 size -= block_len;
992 qemu_put_buffer(f, buf, block_len);
993 }
994 }
995
996 const VMStateInfo vmstate_info_unused_buffer = {
997 .name = "unused_buffer",
998 .get = get_unused_buffer,
999 .put = put_unused_buffer,
1000 };
1001
1002 typedef struct CompatEntry {
1003 char idstr[256];
1004 int instance_id;
1005 } CompatEntry;
1006
1007 typedef struct SaveStateEntry {
1008 QTAILQ_ENTRY(SaveStateEntry) entry;
1009 char idstr[256];
1010 int instance_id;
1011 int alias_id;
1012 int version_id;
1013 int section_id;
1014 SaveSetParamsHandler *set_params;
1015 SaveLiveStateHandler *save_live_state;
1016 SaveStateHandler *save_state;
1017 LoadStateHandler *load_state;
1018 const VMStateDescription *vmsd;
1019 void *opaque;
1020 CompatEntry *compat;
1021 } SaveStateEntry;
1022
1023
1024 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1025 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1026 static int global_section_id;
1027
1028 static int calculate_new_instance_id(const char *idstr)
1029 {
1030 SaveStateEntry *se;
1031 int instance_id = 0;
1032
1033 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1034 if (strcmp(idstr, se->idstr) == 0
1035 && instance_id <= se->instance_id) {
1036 instance_id = se->instance_id + 1;
1037 }
1038 }
1039 return instance_id;
1040 }
1041
1042 static int calculate_compat_instance_id(const char *idstr)
1043 {
1044 SaveStateEntry *se;
1045 int instance_id = 0;
1046
1047 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1048 if (!se->compat)
1049 continue;
1050
1051 if (strcmp(idstr, se->compat->idstr) == 0
1052 && instance_id <= se->compat->instance_id) {
1053 instance_id = se->compat->instance_id + 1;
1054 }
1055 }
1056 return instance_id;
1057 }
1058
1059 /* TODO: Individual devices generally have very little idea about the rest
1060 of the system, so instance_id should be removed/replaced.
1061 Meanwhile pass -1 as instance_id if you do not already have a clearly
1062 distinguishing id for all instances of your device class. */
1063 int register_savevm_live(DeviceState *dev,
1064 const char *idstr,
1065 int instance_id,
1066 int version_id,
1067 SaveSetParamsHandler *set_params,
1068 SaveLiveStateHandler *save_live_state,
1069 SaveStateHandler *save_state,
1070 LoadStateHandler *load_state,
1071 void *opaque)
1072 {
1073 SaveStateEntry *se;
1074
1075 se = qemu_mallocz(sizeof(SaveStateEntry));
1076 se->version_id = version_id;
1077 se->section_id = global_section_id++;
1078 se->set_params = set_params;
1079 se->save_live_state = save_live_state;
1080 se->save_state = save_state;
1081 se->load_state = load_state;
1082 se->opaque = opaque;
1083 se->vmsd = NULL;
1084
1085 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1086 char *id = dev->parent_bus->info->get_dev_path(dev);
1087 if (id) {
1088 pstrcpy(se->idstr, sizeof(se->idstr), id);
1089 pstrcat(se->idstr, sizeof(se->idstr), "/");
1090 qemu_free(id);
1091
1092 se->compat = qemu_mallocz(sizeof(CompatEntry));
1093 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1094 se->compat->instance_id = instance_id == -1 ?
1095 calculate_compat_instance_id(idstr) : instance_id;
1096 instance_id = -1;
1097 }
1098 }
1099 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1100
1101 if (instance_id == -1) {
1102 se->instance_id = calculate_new_instance_id(se->idstr);
1103 } else {
1104 se->instance_id = instance_id;
1105 }
1106 assert(!se->compat || se->instance_id == 0);
1107 /* add at the end of list */
1108 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1109 return 0;
1110 }
1111
1112 int register_savevm(DeviceState *dev,
1113 const char *idstr,
1114 int instance_id,
1115 int version_id,
1116 SaveStateHandler *save_state,
1117 LoadStateHandler *load_state,
1118 void *opaque)
1119 {
1120 return register_savevm_live(dev, idstr, instance_id, version_id,
1121 NULL, NULL, save_state, load_state, opaque);
1122 }
1123
1124 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1125 {
1126 SaveStateEntry *se, *new_se;
1127 char id[256] = "";
1128
1129 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1130 char *path = dev->parent_bus->info->get_dev_path(dev);
1131 if (path) {
1132 pstrcpy(id, sizeof(id), path);
1133 pstrcat(id, sizeof(id), "/");
1134 qemu_free(path);
1135 }
1136 }
1137 pstrcat(id, sizeof(id), idstr);
1138
1139 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1140 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1141 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1142 if (se->compat) {
1143 qemu_free(se->compat);
1144 }
1145 qemu_free(se);
1146 }
1147 }
1148 }
1149
1150 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1151 const VMStateDescription *vmsd,
1152 void *opaque, int alias_id,
1153 int required_for_version)
1154 {
1155 SaveStateEntry *se;
1156
1157 /* If this triggers, alias support can be dropped for the vmsd. */
1158 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1159
1160 se = qemu_mallocz(sizeof(SaveStateEntry));
1161 se->version_id = vmsd->version_id;
1162 se->section_id = global_section_id++;
1163 se->save_live_state = NULL;
1164 se->save_state = NULL;
1165 se->load_state = NULL;
1166 se->opaque = opaque;
1167 se->vmsd = vmsd;
1168 se->alias_id = alias_id;
1169
1170 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1171 char *id = dev->parent_bus->info->get_dev_path(dev);
1172 if (id) {
1173 pstrcpy(se->idstr, sizeof(se->idstr), id);
1174 pstrcat(se->idstr, sizeof(se->idstr), "/");
1175 qemu_free(id);
1176
1177 se->compat = qemu_mallocz(sizeof(CompatEntry));
1178 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1179 se->compat->instance_id = instance_id == -1 ?
1180 calculate_compat_instance_id(vmsd->name) : instance_id;
1181 instance_id = -1;
1182 }
1183 }
1184 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1185
1186 if (instance_id == -1) {
1187 se->instance_id = calculate_new_instance_id(se->idstr);
1188 } else {
1189 se->instance_id = instance_id;
1190 }
1191 assert(!se->compat || se->instance_id == 0);
1192 /* add at the end of list */
1193 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1194 return 0;
1195 }
1196
1197 int vmstate_register(DeviceState *dev, int instance_id,
1198 const VMStateDescription *vmsd, void *opaque)
1199 {
1200 return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1201 opaque, -1, 0);
1202 }
1203
1204 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1205 void *opaque)
1206 {
1207 SaveStateEntry *se, *new_se;
1208
1209 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1210 if (se->vmsd == vmsd && se->opaque == opaque) {
1211 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1212 if (se->compat) {
1213 qemu_free(se->compat);
1214 }
1215 qemu_free(se);
1216 }
1217 }
1218 }
1219
1220 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1221 void *opaque);
1222 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1223 void *opaque);
1224
1225 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1226 void *opaque, int version_id)
1227 {
1228 VMStateField *field = vmsd->fields;
1229 int ret;
1230
1231 if (version_id > vmsd->version_id) {
1232 return -EINVAL;
1233 }
1234 if (version_id < vmsd->minimum_version_id_old) {
1235 return -EINVAL;
1236 }
1237 if (version_id < vmsd->minimum_version_id) {
1238 return vmsd->load_state_old(f, opaque, version_id);
1239 }
1240 if (vmsd->pre_load) {
1241 int ret = vmsd->pre_load(opaque);
1242 if (ret)
1243 return ret;
1244 }
1245 while(field->name) {
1246 if ((field->field_exists &&
1247 field->field_exists(opaque, version_id)) ||
1248 (!field->field_exists &&
1249 field->version_id <= version_id)) {
1250 void *base_addr = opaque + field->offset;
1251 int i, n_elems = 1;
1252 int size = field->size;
1253
1254 if (field->flags & VMS_VBUFFER) {
1255 size = *(int32_t *)(opaque+field->size_offset);
1256 if (field->flags & VMS_MULTIPLY) {
1257 size *= field->size;
1258 }
1259 }
1260 if (field->flags & VMS_ARRAY) {
1261 n_elems = field->num;
1262 } else if (field->flags & VMS_VARRAY_INT32) {
1263 n_elems = *(int32_t *)(opaque+field->num_offset);
1264 } else if (field->flags & VMS_VARRAY_UINT16) {
1265 n_elems = *(uint16_t *)(opaque+field->num_offset);
1266 }
1267 if (field->flags & VMS_POINTER) {
1268 base_addr = *(void **)base_addr + field->start;
1269 }
1270 for (i = 0; i < n_elems; i++) {
1271 void *addr = base_addr + size * i;
1272
1273 if (field->flags & VMS_ARRAY_OF_POINTER) {
1274 addr = *(void **)addr;
1275 }
1276 if (field->flags & VMS_STRUCT) {
1277 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1278 } else {
1279 ret = field->info->get(f, addr, size);
1280
1281 }
1282 if (ret < 0) {
1283 return ret;
1284 }
1285 }
1286 }
1287 field++;
1288 }
1289 ret = vmstate_subsection_load(f, vmsd, opaque);
1290 if (ret != 0) {
1291 return ret;
1292 }
1293 if (vmsd->post_load) {
1294 return vmsd->post_load(opaque, version_id);
1295 }
1296 return 0;
1297 }
1298
1299 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1300 void *opaque)
1301 {
1302 VMStateField *field = vmsd->fields;
1303
1304 if (vmsd->pre_save) {
1305 vmsd->pre_save(opaque);
1306 }
1307 while(field->name) {
1308 if (!field->field_exists ||
1309 field->field_exists(opaque, vmsd->version_id)) {
1310 void *base_addr = opaque + field->offset;
1311 int i, n_elems = 1;
1312 int size = field->size;
1313
1314 if (field->flags & VMS_VBUFFER) {
1315 size = *(int32_t *)(opaque+field->size_offset);
1316 if (field->flags & VMS_MULTIPLY) {
1317 size *= field->size;
1318 }
1319 }
1320 if (field->flags & VMS_ARRAY) {
1321 n_elems = field->num;
1322 } else if (field->flags & VMS_VARRAY_INT32) {
1323 n_elems = *(int32_t *)(opaque+field->num_offset);
1324 } else if (field->flags & VMS_VARRAY_UINT16) {
1325 n_elems = *(uint16_t *)(opaque+field->num_offset);
1326 }
1327 if (field->flags & VMS_POINTER) {
1328 base_addr = *(void **)base_addr + field->start;
1329 }
1330 for (i = 0; i < n_elems; i++) {
1331 void *addr = base_addr + size * i;
1332
1333 if (field->flags & VMS_ARRAY_OF_POINTER) {
1334 addr = *(void **)addr;
1335 }
1336 if (field->flags & VMS_STRUCT) {
1337 vmstate_save_state(f, field->vmsd, addr);
1338 } else {
1339 field->info->put(f, addr, size);
1340 }
1341 }
1342 }
1343 field++;
1344 }
1345 vmstate_subsection_save(f, vmsd, opaque);
1346 }
1347
1348 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1349 {
1350 if (!se->vmsd) { /* Old style */
1351 return se->load_state(f, se->opaque, version_id);
1352 }
1353 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1354 }
1355
1356 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1357 {
1358 if (!se->vmsd) { /* Old style */
1359 se->save_state(f, se->opaque);
1360 return;
1361 }
1362 vmstate_save_state(f,se->vmsd, se->opaque);
1363 }
1364
1365 #define QEMU_VM_FILE_MAGIC 0x5145564d
1366 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1367 #define QEMU_VM_FILE_VERSION 0x00000003
1368
1369 #define QEMU_VM_EOF 0x00
1370 #define QEMU_VM_SECTION_START 0x01
1371 #define QEMU_VM_SECTION_PART 0x02
1372 #define QEMU_VM_SECTION_END 0x03
1373 #define QEMU_VM_SECTION_FULL 0x04
1374 #define QEMU_VM_SUBSECTION 0x05
1375
1376 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1377 int shared)
1378 {
1379 SaveStateEntry *se;
1380
1381 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1382 if(se->set_params == NULL) {
1383 continue;
1384 }
1385 se->set_params(blk_enable, shared, se->opaque);
1386 }
1387
1388 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1389 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1390
1391 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1392 int len;
1393
1394 if (se->save_live_state == NULL)
1395 continue;
1396
1397 /* Section type */
1398 qemu_put_byte(f, QEMU_VM_SECTION_START);
1399 qemu_put_be32(f, se->section_id);
1400
1401 /* ID string */
1402 len = strlen(se->idstr);
1403 qemu_put_byte(f, len);
1404 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1405
1406 qemu_put_be32(f, se->instance_id);
1407 qemu_put_be32(f, se->version_id);
1408
1409 se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1410 }
1411
1412 if (qemu_file_has_error(f)) {
1413 qemu_savevm_state_cancel(mon, f);
1414 return -EIO;
1415 }
1416
1417 return 0;
1418 }
1419
1420 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1421 {
1422 SaveStateEntry *se;
1423 int ret = 1;
1424
1425 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1426 if (se->save_live_state == NULL)
1427 continue;
1428
1429 /* Section type */
1430 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1431 qemu_put_be32(f, se->section_id);
1432
1433 ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1434 if (!ret) {
1435 /* Do not proceed to the next vmstate before this one reported
1436 completion of the current stage. This serializes the migration
1437 and reduces the probability that a faster changing state is
1438 synchronized over and over again. */
1439 break;
1440 }
1441 }
1442
1443 if (ret)
1444 return 1;
1445
1446 if (qemu_file_has_error(f)) {
1447 qemu_savevm_state_cancel(mon, f);
1448 return -EIO;
1449 }
1450
1451 return 0;
1452 }
1453
1454 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1455 {
1456 SaveStateEntry *se;
1457
1458 cpu_synchronize_all_states();
1459
1460 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1461 if (se->save_live_state == NULL)
1462 continue;
1463
1464 /* Section type */
1465 qemu_put_byte(f, QEMU_VM_SECTION_END);
1466 qemu_put_be32(f, se->section_id);
1467
1468 se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1469 }
1470
1471 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1472 int len;
1473
1474 if (se->save_state == NULL && se->vmsd == NULL)
1475 continue;
1476
1477 /* Section type */
1478 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1479 qemu_put_be32(f, se->section_id);
1480
1481 /* ID string */
1482 len = strlen(se->idstr);
1483 qemu_put_byte(f, len);
1484 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1485
1486 qemu_put_be32(f, se->instance_id);
1487 qemu_put_be32(f, se->version_id);
1488
1489 vmstate_save(f, se);
1490 }
1491
1492 qemu_put_byte(f, QEMU_VM_EOF);
1493
1494 if (qemu_file_has_error(f))
1495 return -EIO;
1496
1497 return 0;
1498 }
1499
1500 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1501 {
1502 SaveStateEntry *se;
1503
1504 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1505 if (se->save_live_state) {
1506 se->save_live_state(mon, f, -1, se->opaque);
1507 }
1508 }
1509 }
1510
1511 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1512 {
1513 int saved_vm_running;
1514 int ret;
1515
1516 saved_vm_running = vm_running;
1517 vm_stop(0);
1518
1519 bdrv_flush_all();
1520
1521 ret = qemu_savevm_state_begin(mon, f, 0, 0);
1522 if (ret < 0)
1523 goto out;
1524
1525 do {
1526 ret = qemu_savevm_state_iterate(mon, f);
1527 if (ret < 0)
1528 goto out;
1529 } while (ret == 0);
1530
1531 ret = qemu_savevm_state_complete(mon, f);
1532
1533 out:
1534 if (qemu_file_has_error(f))
1535 ret = -EIO;
1536
1537 if (!ret && saved_vm_running)
1538 vm_start();
1539
1540 return ret;
1541 }
1542
1543 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1544 {
1545 SaveStateEntry *se;
1546
1547 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1548 if (!strcmp(se->idstr, idstr) &&
1549 (instance_id == se->instance_id ||
1550 instance_id == se->alias_id))
1551 return se;
1552 /* Migrating from an older version? */
1553 if (strstr(se->idstr, idstr) && se->compat) {
1554 if (!strcmp(se->compat->idstr, idstr) &&
1555 (instance_id == se->compat->instance_id ||
1556 instance_id == se->alias_id))
1557 return se;
1558 }
1559 }
1560 return NULL;
1561 }
1562
1563 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1564 {
1565 while(sub && sub->needed) {
1566 if (strcmp(idstr, sub->vmsd->name) == 0) {
1567 return sub->vmsd;
1568 }
1569 sub++;
1570 }
1571 return NULL;
1572 }
1573
1574 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1575 void *opaque)
1576 {
1577 while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1578 char idstr[256];
1579 int ret;
1580 uint8_t version_id, subsection, len;
1581 const VMStateDescription *sub_vmsd;
1582
1583 subsection = qemu_get_byte(f);
1584 len = qemu_get_byte(f);
1585 qemu_get_buffer(f, (uint8_t *)idstr, len);
1586 idstr[len] = 0;
1587 version_id = qemu_get_be32(f);
1588
1589 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1590 if (sub_vmsd == NULL) {
1591 return -ENOENT;
1592 }
1593 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1594 if (ret) {
1595 return ret;
1596 }
1597 }
1598 return 0;
1599 }
1600
1601 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1602 void *opaque)
1603 {
1604 const VMStateSubsection *sub = vmsd->subsections;
1605
1606 while (sub && sub->needed) {
1607 if (sub->needed(opaque)) {
1608 const VMStateDescription *vmsd = sub->vmsd;
1609 uint8_t len;
1610
1611 qemu_put_byte(f, QEMU_VM_SUBSECTION);
1612 len = strlen(vmsd->name);
1613 qemu_put_byte(f, len);
1614 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1615 qemu_put_be32(f, vmsd->version_id);
1616 vmstate_save_state(f, vmsd, opaque);
1617 }
1618 sub++;
1619 }
1620 }
1621
1622 typedef struct LoadStateEntry {
1623 QLIST_ENTRY(LoadStateEntry) entry;
1624 SaveStateEntry *se;
1625 int section_id;
1626 int version_id;
1627 } LoadStateEntry;
1628
1629 int qemu_loadvm_state(QEMUFile *f)
1630 {
1631 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1632 QLIST_HEAD_INITIALIZER(loadvm_handlers);
1633 LoadStateEntry *le, *new_le;
1634 uint8_t section_type;
1635 unsigned int v;
1636 int ret;
1637
1638 v = qemu_get_be32(f);
1639 if (v != QEMU_VM_FILE_MAGIC)
1640 return -EINVAL;
1641
1642 v = qemu_get_be32(f);
1643 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1644 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1645 return -ENOTSUP;
1646 }
1647 if (v != QEMU_VM_FILE_VERSION)
1648 return -ENOTSUP;
1649
1650 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1651 uint32_t instance_id, version_id, section_id;
1652 SaveStateEntry *se;
1653 char idstr[257];
1654 int len;
1655
1656 switch (section_type) {
1657 case QEMU_VM_SECTION_START:
1658 case QEMU_VM_SECTION_FULL:
1659 /* Read section start */
1660 section_id = qemu_get_be32(f);
1661 len = qemu_get_byte(f);
1662 qemu_get_buffer(f, (uint8_t *)idstr, len);
1663 idstr[len] = 0;
1664 instance_id = qemu_get_be32(f);
1665 version_id = qemu_get_be32(f);
1666
1667 /* Find savevm section */
1668 se = find_se(idstr, instance_id);
1669 if (se == NULL) {
1670 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1671 ret = -EINVAL;
1672 goto out;
1673 }
1674
1675 /* Validate version */
1676 if (version_id > se->version_id) {
1677 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1678 version_id, idstr, se->version_id);
1679 ret = -EINVAL;
1680 goto out;
1681 }
1682
1683 /* Add entry */
1684 le = qemu_mallocz(sizeof(*le));
1685
1686 le->se = se;
1687 le->section_id = section_id;
1688 le->version_id = version_id;
1689 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1690
1691 ret = vmstate_load(f, le->se, le->version_id);
1692 if (ret < 0) {
1693 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1694 instance_id, idstr);
1695 goto out;
1696 }
1697 break;
1698 case QEMU_VM_SECTION_PART:
1699 case QEMU_VM_SECTION_END:
1700 section_id = qemu_get_be32(f);
1701
1702 QLIST_FOREACH(le, &loadvm_handlers, entry) {
1703 if (le->section_id == section_id) {
1704 break;
1705 }
1706 }
1707 if (le == NULL) {
1708 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1709 ret = -EINVAL;
1710 goto out;
1711 }
1712
1713 ret = vmstate_load(f, le->se, le->version_id);
1714 if (ret < 0) {
1715 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1716 section_id);
1717 goto out;
1718 }
1719 break;
1720 default:
1721 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1722 ret = -EINVAL;
1723 goto out;
1724 }
1725 }
1726
1727 cpu_synchronize_all_post_init();
1728
1729 ret = 0;
1730
1731 out:
1732 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1733 QLIST_REMOVE(le, entry);
1734 qemu_free(le);
1735 }
1736
1737 if (qemu_file_has_error(f))
1738 ret = -EIO;
1739
1740 return ret;
1741 }
1742
1743 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1744 const char *name)
1745 {
1746 QEMUSnapshotInfo *sn_tab, *sn;
1747 int nb_sns, i, ret;
1748
1749 ret = -ENOENT;
1750 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1751 if (nb_sns < 0)
1752 return ret;
1753 for(i = 0; i < nb_sns; i++) {
1754 sn = &sn_tab[i];
1755 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1756 *sn_info = *sn;
1757 ret = 0;
1758 break;
1759 }
1760 }
1761 qemu_free(sn_tab);
1762 return ret;
1763 }
1764
1765 /*
1766 * Deletes snapshots of a given name in all opened images.
1767 */
1768 static int del_existing_snapshots(Monitor *mon, const char *name)
1769 {
1770 BlockDriverState *bs;
1771 QEMUSnapshotInfo sn1, *snapshot = &sn1;
1772 int ret;
1773
1774 bs = NULL;
1775 while ((bs = bdrv_next(bs))) {
1776 if (bdrv_can_snapshot(bs) &&
1777 bdrv_snapshot_find(bs, snapshot, name) >= 0)
1778 {
1779 ret = bdrv_snapshot_delete(bs, name);
1780 if (ret < 0) {
1781 monitor_printf(mon,
1782 "Error while deleting snapshot on '%s'\n",
1783 bdrv_get_device_name(bs));
1784 return -1;
1785 }
1786 }
1787 }
1788
1789 return 0;
1790 }
1791
1792 void do_savevm(Monitor *mon, const QDict *qdict)
1793 {
1794 BlockDriverState *bs, *bs1;
1795 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1796 int ret;
1797 QEMUFile *f;
1798 int saved_vm_running;
1799 uint32_t vm_state_size;
1800 #ifdef _WIN32
1801 struct _timeb tb;
1802 #else
1803 struct timeval tv;
1804 #endif
1805 const char *name = qdict_get_try_str(qdict, "name");
1806
1807 /* Verify if there is a device that doesn't support snapshots and is writable */
1808 bs = NULL;
1809 while ((bs = bdrv_next(bs))) {
1810
1811 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1812 continue;
1813 }
1814
1815 if (!bdrv_can_snapshot(bs)) {
1816 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1817 bdrv_get_device_name(bs));
1818 return;
1819 }
1820 }
1821
1822 bs = bdrv_snapshots();
1823 if (!bs) {
1824 monitor_printf(mon, "No block device can accept snapshots\n");
1825 return;
1826 }
1827 /* ??? Should this occur after vm_stop? */
1828 qemu_aio_flush();
1829
1830 saved_vm_running = vm_running;
1831 vm_stop(0);
1832
1833 memset(sn, 0, sizeof(*sn));
1834 if (name) {
1835 ret = bdrv_snapshot_find(bs, old_sn, name);
1836 if (ret >= 0) {
1837 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1838 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1839 } else {
1840 pstrcpy(sn->name, sizeof(sn->name), name);
1841 }
1842 }
1843
1844 /* fill auxiliary fields */
1845 #ifdef _WIN32
1846 _ftime(&tb);
1847 sn->date_sec = tb.time;
1848 sn->date_nsec = tb.millitm * 1000000;
1849 #else
1850 gettimeofday(&tv, NULL);
1851 sn->date_sec = tv.tv_sec;
1852 sn->date_nsec = tv.tv_usec * 1000;
1853 #endif
1854 sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1855
1856 /* Delete old snapshots of the same name */
1857 if (name && del_existing_snapshots(mon, name) < 0) {
1858 goto the_end;
1859 }
1860
1861 /* save the VM state */
1862 f = qemu_fopen_bdrv(bs, 1);
1863 if (!f) {
1864 monitor_printf(mon, "Could not open VM state file\n");
1865 goto the_end;
1866 }
1867 ret = qemu_savevm_state(mon, f);
1868 vm_state_size = qemu_ftell(f);
1869 qemu_fclose(f);
1870 if (ret < 0) {
1871 monitor_printf(mon, "Error %d while writing VM\n", ret);
1872 goto the_end;
1873 }
1874
1875 /* create the snapshots */
1876
1877 bs1 = NULL;
1878 while ((bs1 = bdrv_next(bs1))) {
1879 if (bdrv_can_snapshot(bs1)) {
1880 /* Write VM state size only to the image that contains the state */
1881 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1882 ret = bdrv_snapshot_create(bs1, sn);
1883 if (ret < 0) {
1884 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1885 bdrv_get_device_name(bs1));
1886 }
1887 }
1888 }
1889
1890 the_end:
1891 if (saved_vm_running)
1892 vm_start();
1893 }
1894
1895 int load_vmstate(const char *name)
1896 {
1897 BlockDriverState *bs, *bs1;
1898 QEMUSnapshotInfo sn;
1899 QEMUFile *f;
1900 int ret;
1901
1902 /* Verify if there is a device that doesn't support snapshots and is writable */
1903 bs = NULL;
1904 while ((bs = bdrv_next(bs))) {
1905
1906 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1907 continue;
1908 }
1909
1910 if (!bdrv_can_snapshot(bs)) {
1911 error_report("Device '%s' is writable but does not support snapshots.",
1912 bdrv_get_device_name(bs));
1913 return -ENOTSUP;
1914 }
1915 }
1916
1917 bs = bdrv_snapshots();
1918 if (!bs) {
1919 error_report("No block device supports snapshots");
1920 return -EINVAL;
1921 }
1922
1923 /* Flush all IO requests so they don't interfere with the new state. */
1924 qemu_aio_flush();
1925
1926 bs1 = NULL;
1927 while ((bs1 = bdrv_next(bs1))) {
1928 if (bdrv_can_snapshot(bs1)) {
1929 ret = bdrv_snapshot_goto(bs1, name);
1930 if (ret < 0) {
1931 switch(ret) {
1932 case -ENOTSUP:
1933 error_report("%sSnapshots not supported on device '%s'",
1934 bs != bs1 ? "Warning: " : "",
1935 bdrv_get_device_name(bs1));
1936 break;
1937 case -ENOENT:
1938 error_report("%sCould not find snapshot '%s' on device '%s'",
1939 bs != bs1 ? "Warning: " : "",
1940 name, bdrv_get_device_name(bs1));
1941 break;
1942 default:
1943 error_report("%sError %d while activating snapshot on '%s'",
1944 bs != bs1 ? "Warning: " : "",
1945 ret, bdrv_get_device_name(bs1));
1946 break;
1947 }
1948 /* fatal on snapshot block device */
1949 if (bs == bs1)
1950 return 0;
1951 }
1952 }
1953 }
1954
1955 /* Don't even try to load empty VM states */
1956 ret = bdrv_snapshot_find(bs, &sn, name);
1957 if ((ret >= 0) && (sn.vm_state_size == 0))
1958 return -EINVAL;
1959
1960 /* restore the VM state */
1961 f = qemu_fopen_bdrv(bs, 0);
1962 if (!f) {
1963 error_report("Could not open VM state file");
1964 return -EINVAL;
1965 }
1966 ret = qemu_loadvm_state(f);
1967 qemu_fclose(f);
1968 if (ret < 0) {
1969 error_report("Error %d while loading VM state", ret);
1970 return ret;
1971 }
1972 return 0;
1973 }
1974
1975 void do_delvm(Monitor *mon, const QDict *qdict)
1976 {
1977 BlockDriverState *bs, *bs1;
1978 int ret;
1979 const char *name = qdict_get_str(qdict, "name");
1980
1981 bs = bdrv_snapshots();
1982 if (!bs) {
1983 monitor_printf(mon, "No block device supports snapshots\n");
1984 return;
1985 }
1986
1987 bs1 = NULL;
1988 while ((bs1 = bdrv_next(bs1))) {
1989 if (bdrv_can_snapshot(bs1)) {
1990 ret = bdrv_snapshot_delete(bs1, name);
1991 if (ret < 0) {
1992 if (ret == -ENOTSUP)
1993 monitor_printf(mon,
1994 "Snapshots not supported on device '%s'\n",
1995 bdrv_get_device_name(bs1));
1996 else
1997 monitor_printf(mon, "Error %d while deleting snapshot on "
1998 "'%s'\n", ret, bdrv_get_device_name(bs1));
1999 }
2000 }
2001 }
2002 }
2003
2004 void do_info_snapshots(Monitor *mon)
2005 {
2006 BlockDriverState *bs, *bs1;
2007 QEMUSnapshotInfo *sn_tab, *sn;
2008 int nb_sns, i;
2009 char buf[256];
2010
2011 bs = bdrv_snapshots();
2012 if (!bs) {
2013 monitor_printf(mon, "No available block device supports snapshots\n");
2014 return;
2015 }
2016 monitor_printf(mon, "Snapshot devices:");
2017 bs1 = NULL;
2018 while ((bs1 = bdrv_next(bs1))) {
2019 if (bdrv_can_snapshot(bs1)) {
2020 if (bs == bs1)
2021 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
2022 }
2023 }
2024 monitor_printf(mon, "\n");
2025
2026 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2027 if (nb_sns < 0) {
2028 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2029 return;
2030 }
2031 monitor_printf(mon, "Snapshot list (from %s):\n",
2032 bdrv_get_device_name(bs));
2033 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2034 for(i = 0; i < nb_sns; i++) {
2035 sn = &sn_tab[i];
2036 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2037 }
2038 qemu_free(sn_tab);
2039 }
QEmu