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win32: Avoid compiler warning (WIN32_LEAN_AND_MEAN redefined)
[qemu.git] / savevm.c
blob99e49499a9fc98aca739e38336f8df893fb76d18
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 int no_migrate;
1022 } SaveStateEntry;
1023
1024
1025 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1026 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1027 static int global_section_id;
1028
1029 static int calculate_new_instance_id(const char *idstr)
1030 {
1031 SaveStateEntry *se;
1032 int instance_id = 0;
1033
1034 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1035 if (strcmp(idstr, se->idstr) == 0
1036 && instance_id <= se->instance_id) {
1037 instance_id = se->instance_id + 1;
1038 }
1039 }
1040 return instance_id;
1041 }
1042
1043 static int calculate_compat_instance_id(const char *idstr)
1044 {
1045 SaveStateEntry *se;
1046 int instance_id = 0;
1047
1048 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1049 if (!se->compat)
1050 continue;
1051
1052 if (strcmp(idstr, se->compat->idstr) == 0
1053 && instance_id <= se->compat->instance_id) {
1054 instance_id = se->compat->instance_id + 1;
1055 }
1056 }
1057 return instance_id;
1058 }
1059
1060 /* TODO: Individual devices generally have very little idea about the rest
1061 of the system, so instance_id should be removed/replaced.
1062 Meanwhile pass -1 as instance_id if you do not already have a clearly
1063 distinguishing id for all instances of your device class. */
1064 int register_savevm_live(DeviceState *dev,
1065 const char *idstr,
1066 int instance_id,
1067 int version_id,
1068 SaveSetParamsHandler *set_params,
1069 SaveLiveStateHandler *save_live_state,
1070 SaveStateHandler *save_state,
1071 LoadStateHandler *load_state,
1072 void *opaque)
1073 {
1074 SaveStateEntry *se;
1075
1076 se = qemu_mallocz(sizeof(SaveStateEntry));
1077 se->version_id = version_id;
1078 se->section_id = global_section_id++;
1079 se->set_params = set_params;
1080 se->save_live_state = save_live_state;
1081 se->save_state = save_state;
1082 se->load_state = load_state;
1083 se->opaque = opaque;
1084 se->vmsd = NULL;
1085 se->no_migrate = 0;
1086
1087 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1088 char *id = dev->parent_bus->info->get_dev_path(dev);
1089 if (id) {
1090 pstrcpy(se->idstr, sizeof(se->idstr), id);
1091 pstrcat(se->idstr, sizeof(se->idstr), "/");
1092 qemu_free(id);
1093
1094 se->compat = qemu_mallocz(sizeof(CompatEntry));
1095 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1096 se->compat->instance_id = instance_id == -1 ?
1097 calculate_compat_instance_id(idstr) : instance_id;
1098 instance_id = -1;
1099 }
1100 }
1101 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1102
1103 if (instance_id == -1) {
1104 se->instance_id = calculate_new_instance_id(se->idstr);
1105 } else {
1106 se->instance_id = instance_id;
1107 }
1108 assert(!se->compat || se->instance_id == 0);
1109 /* add at the end of list */
1110 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1111 return 0;
1112 }
1113
1114 int register_savevm(DeviceState *dev,
1115 const char *idstr,
1116 int instance_id,
1117 int version_id,
1118 SaveStateHandler *save_state,
1119 LoadStateHandler *load_state,
1120 void *opaque)
1121 {
1122 return register_savevm_live(dev, idstr, instance_id, version_id,
1123 NULL, NULL, save_state, load_state, opaque);
1124 }
1125
1126 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1127 {
1128 SaveStateEntry *se, *new_se;
1129 char id[256] = "";
1130
1131 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1132 char *path = dev->parent_bus->info->get_dev_path(dev);
1133 if (path) {
1134 pstrcpy(id, sizeof(id), path);
1135 pstrcat(id, sizeof(id), "/");
1136 qemu_free(path);
1137 }
1138 }
1139 pstrcat(id, sizeof(id), idstr);
1140
1141 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1142 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1143 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1144 if (se->compat) {
1145 qemu_free(se->compat);
1146 }
1147 qemu_free(se);
1148 }
1149 }
1150 }
1151
1152 /* mark a device as not to be migrated, that is the device should be
1153 unplugged before migration */
1154 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1155 void *opaque)
1156 {
1157 SaveStateEntry *se;
1158 char id[256] = "";
1159
1160 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1161 char *path = dev->parent_bus->info->get_dev_path(dev);
1162 if (path) {
1163 pstrcpy(id, sizeof(id), path);
1164 pstrcat(id, sizeof(id), "/");
1165 qemu_free(path);
1166 }
1167 }
1168 pstrcat(id, sizeof(id), idstr);
1169
1170 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1171 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1172 se->no_migrate = 1;
1173 }
1174 }
1175 }
1176
1177 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1178 const VMStateDescription *vmsd,
1179 void *opaque, int alias_id,
1180 int required_for_version)
1181 {
1182 SaveStateEntry *se;
1183
1184 /* If this triggers, alias support can be dropped for the vmsd. */
1185 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1186
1187 se = qemu_mallocz(sizeof(SaveStateEntry));
1188 se->version_id = vmsd->version_id;
1189 se->section_id = global_section_id++;
1190 se->save_live_state = NULL;
1191 se->save_state = NULL;
1192 se->load_state = NULL;
1193 se->opaque = opaque;
1194 se->vmsd = vmsd;
1195 se->alias_id = alias_id;
1196
1197 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1198 char *id = dev->parent_bus->info->get_dev_path(dev);
1199 if (id) {
1200 pstrcpy(se->idstr, sizeof(se->idstr), id);
1201 pstrcat(se->idstr, sizeof(se->idstr), "/");
1202 qemu_free(id);
1203
1204 se->compat = qemu_mallocz(sizeof(CompatEntry));
1205 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1206 se->compat->instance_id = instance_id == -1 ?
1207 calculate_compat_instance_id(vmsd->name) : instance_id;
1208 instance_id = -1;
1209 }
1210 }
1211 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1212
1213 if (instance_id == -1) {
1214 se->instance_id = calculate_new_instance_id(se->idstr);
1215 } else {
1216 se->instance_id = instance_id;
1217 }
1218 assert(!se->compat || se->instance_id == 0);
1219 /* add at the end of list */
1220 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1221 return 0;
1222 }
1223
1224 int vmstate_register(DeviceState *dev, int instance_id,
1225 const VMStateDescription *vmsd, void *opaque)
1226 {
1227 return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1228 opaque, -1, 0);
1229 }
1230
1231 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1232 void *opaque)
1233 {
1234 SaveStateEntry *se, *new_se;
1235
1236 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1237 if (se->vmsd == vmsd && se->opaque == opaque) {
1238 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1239 if (se->compat) {
1240 qemu_free(se->compat);
1241 }
1242 qemu_free(se);
1243 }
1244 }
1245 }
1246
1247 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1248 void *opaque);
1249 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1250 void *opaque);
1251
1252 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1253 void *opaque, int version_id)
1254 {
1255 VMStateField *field = vmsd->fields;
1256 int ret;
1257
1258 if (version_id > vmsd->version_id) {
1259 return -EINVAL;
1260 }
1261 if (version_id < vmsd->minimum_version_id_old) {
1262 return -EINVAL;
1263 }
1264 if (version_id < vmsd->minimum_version_id) {
1265 return vmsd->load_state_old(f, opaque, version_id);
1266 }
1267 if (vmsd->pre_load) {
1268 int ret = vmsd->pre_load(opaque);
1269 if (ret)
1270 return ret;
1271 }
1272 while(field->name) {
1273 if ((field->field_exists &&
1274 field->field_exists(opaque, version_id)) ||
1275 (!field->field_exists &&
1276 field->version_id <= version_id)) {
1277 void *base_addr = opaque + field->offset;
1278 int i, n_elems = 1;
1279 int size = field->size;
1280
1281 if (field->flags & VMS_VBUFFER) {
1282 size = *(int32_t *)(opaque+field->size_offset);
1283 if (field->flags & VMS_MULTIPLY) {
1284 size *= field->size;
1285 }
1286 }
1287 if (field->flags & VMS_ARRAY) {
1288 n_elems = field->num;
1289 } else if (field->flags & VMS_VARRAY_INT32) {
1290 n_elems = *(int32_t *)(opaque+field->num_offset);
1291 } else if (field->flags & VMS_VARRAY_UINT16) {
1292 n_elems = *(uint16_t *)(opaque+field->num_offset);
1293 }
1294 if (field->flags & VMS_POINTER) {
1295 base_addr = *(void **)base_addr + field->start;
1296 }
1297 for (i = 0; i < n_elems; i++) {
1298 void *addr = base_addr + size * i;
1299
1300 if (field->flags & VMS_ARRAY_OF_POINTER) {
1301 addr = *(void **)addr;
1302 }
1303 if (field->flags & VMS_STRUCT) {
1304 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1305 } else {
1306 ret = field->info->get(f, addr, size);
1307
1308 }
1309 if (ret < 0) {
1310 return ret;
1311 }
1312 }
1313 }
1314 field++;
1315 }
1316 ret = vmstate_subsection_load(f, vmsd, opaque);
1317 if (ret != 0) {
1318 return ret;
1319 }
1320 if (vmsd->post_load) {
1321 return vmsd->post_load(opaque, version_id);
1322 }
1323 return 0;
1324 }
1325
1326 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1327 void *opaque)
1328 {
1329 VMStateField *field = vmsd->fields;
1330
1331 if (vmsd->pre_save) {
1332 vmsd->pre_save(opaque);
1333 }
1334 while(field->name) {
1335 if (!field->field_exists ||
1336 field->field_exists(opaque, vmsd->version_id)) {
1337 void *base_addr = opaque + field->offset;
1338 int i, n_elems = 1;
1339 int size = field->size;
1340
1341 if (field->flags & VMS_VBUFFER) {
1342 size = *(int32_t *)(opaque+field->size_offset);
1343 if (field->flags & VMS_MULTIPLY) {
1344 size *= field->size;
1345 }
1346 }
1347 if (field->flags & VMS_ARRAY) {
1348 n_elems = field->num;
1349 } else if (field->flags & VMS_VARRAY_INT32) {
1350 n_elems = *(int32_t *)(opaque+field->num_offset);
1351 } else if (field->flags & VMS_VARRAY_UINT16) {
1352 n_elems = *(uint16_t *)(opaque+field->num_offset);
1353 }
1354 if (field->flags & VMS_POINTER) {
1355 base_addr = *(void **)base_addr + field->start;
1356 }
1357 for (i = 0; i < n_elems; i++) {
1358 void *addr = base_addr + size * i;
1359
1360 if (field->flags & VMS_ARRAY_OF_POINTER) {
1361 addr = *(void **)addr;
1362 }
1363 if (field->flags & VMS_STRUCT) {
1364 vmstate_save_state(f, field->vmsd, addr);
1365 } else {
1366 field->info->put(f, addr, size);
1367 }
1368 }
1369 }
1370 field++;
1371 }
1372 vmstate_subsection_save(f, vmsd, opaque);
1373 }
1374
1375 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1376 {
1377 if (!se->vmsd) { /* Old style */
1378 return se->load_state(f, se->opaque, version_id);
1379 }
1380 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1381 }
1382
1383 static int vmstate_save(QEMUFile *f, SaveStateEntry *se)
1384 {
1385 if (se->no_migrate) {
1386 return -1;
1387 }
1388
1389 if (!se->vmsd) { /* Old style */
1390 se->save_state(f, se->opaque);
1391 return 0;
1392 }
1393 vmstate_save_state(f,se->vmsd, se->opaque);
1394
1395 return 0;
1396 }
1397
1398 #define QEMU_VM_FILE_MAGIC 0x5145564d
1399 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1400 #define QEMU_VM_FILE_VERSION 0x00000003
1401
1402 #define QEMU_VM_EOF 0x00
1403 #define QEMU_VM_SECTION_START 0x01
1404 #define QEMU_VM_SECTION_PART 0x02
1405 #define QEMU_VM_SECTION_END 0x03
1406 #define QEMU_VM_SECTION_FULL 0x04
1407 #define QEMU_VM_SUBSECTION 0x05
1408
1409 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1410 int shared)
1411 {
1412 SaveStateEntry *se;
1413
1414 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1415 if(se->set_params == NULL) {
1416 continue;
1417 }
1418 se->set_params(blk_enable, shared, se->opaque);
1419 }
1420
1421 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1422 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1423
1424 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1425 int len;
1426
1427 if (se->save_live_state == NULL)
1428 continue;
1429
1430 /* Section type */
1431 qemu_put_byte(f, QEMU_VM_SECTION_START);
1432 qemu_put_be32(f, se->section_id);
1433
1434 /* ID string */
1435 len = strlen(se->idstr);
1436 qemu_put_byte(f, len);
1437 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1438
1439 qemu_put_be32(f, se->instance_id);
1440 qemu_put_be32(f, se->version_id);
1441
1442 se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1443 }
1444
1445 if (qemu_file_has_error(f)) {
1446 qemu_savevm_state_cancel(mon, f);
1447 return -EIO;
1448 }
1449
1450 return 0;
1451 }
1452
1453 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1454 {
1455 SaveStateEntry *se;
1456 int ret = 1;
1457
1458 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1459 if (se->save_live_state == NULL)
1460 continue;
1461
1462 /* Section type */
1463 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1464 qemu_put_be32(f, se->section_id);
1465
1466 ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1467 if (!ret) {
1468 /* Do not proceed to the next vmstate before this one reported
1469 completion of the current stage. This serializes the migration
1470 and reduces the probability that a faster changing state is
1471 synchronized over and over again. */
1472 break;
1473 }
1474 }
1475
1476 if (ret)
1477 return 1;
1478
1479 if (qemu_file_has_error(f)) {
1480 qemu_savevm_state_cancel(mon, f);
1481 return -EIO;
1482 }
1483
1484 return 0;
1485 }
1486
1487 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1488 {
1489 SaveStateEntry *se;
1490 int r;
1491
1492 cpu_synchronize_all_states();
1493
1494 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1495 if (se->save_live_state == NULL)
1496 continue;
1497
1498 /* Section type */
1499 qemu_put_byte(f, QEMU_VM_SECTION_END);
1500 qemu_put_be32(f, se->section_id);
1501
1502 se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1503 }
1504
1505 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1506 int len;
1507
1508 if (se->save_state == NULL && se->vmsd == NULL)
1509 continue;
1510
1511 /* Section type */
1512 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1513 qemu_put_be32(f, se->section_id);
1514
1515 /* ID string */
1516 len = strlen(se->idstr);
1517 qemu_put_byte(f, len);
1518 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1519
1520 qemu_put_be32(f, se->instance_id);
1521 qemu_put_be32(f, se->version_id);
1522
1523 r = vmstate_save(f, se);
1524 if (r < 0) {
1525 monitor_printf(mon, "cannot migrate with device '%s'\n", se->idstr);
1526 return r;
1527 }
1528 }
1529
1530 qemu_put_byte(f, QEMU_VM_EOF);
1531
1532 if (qemu_file_has_error(f))
1533 return -EIO;
1534
1535 return 0;
1536 }
1537
1538 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1539 {
1540 SaveStateEntry *se;
1541
1542 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1543 if (se->save_live_state) {
1544 se->save_live_state(mon, f, -1, se->opaque);
1545 }
1546 }
1547 }
1548
1549 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1550 {
1551 int saved_vm_running;
1552 int ret;
1553
1554 saved_vm_running = vm_running;
1555 vm_stop(0);
1556
1557 bdrv_flush_all();
1558
1559 ret = qemu_savevm_state_begin(mon, f, 0, 0);
1560 if (ret < 0)
1561 goto out;
1562
1563 do {
1564 ret = qemu_savevm_state_iterate(mon, f);
1565 if (ret < 0)
1566 goto out;
1567 } while (ret == 0);
1568
1569 ret = qemu_savevm_state_complete(mon, f);
1570
1571 out:
1572 if (qemu_file_has_error(f))
1573 ret = -EIO;
1574
1575 if (!ret && saved_vm_running)
1576 vm_start();
1577
1578 return ret;
1579 }
1580
1581 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1582 {
1583 SaveStateEntry *se;
1584
1585 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1586 if (!strcmp(se->idstr, idstr) &&
1587 (instance_id == se->instance_id ||
1588 instance_id == se->alias_id))
1589 return se;
1590 /* Migrating from an older version? */
1591 if (strstr(se->idstr, idstr) && se->compat) {
1592 if (!strcmp(se->compat->idstr, idstr) &&
1593 (instance_id == se->compat->instance_id ||
1594 instance_id == se->alias_id))
1595 return se;
1596 }
1597 }
1598 return NULL;
1599 }
1600
1601 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1602 {
1603 while(sub && sub->needed) {
1604 if (strcmp(idstr, sub->vmsd->name) == 0) {
1605 return sub->vmsd;
1606 }
1607 sub++;
1608 }
1609 return NULL;
1610 }
1611
1612 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1613 void *opaque)
1614 {
1615 while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1616 char idstr[256];
1617 int ret;
1618 uint8_t version_id, subsection, len;
1619 const VMStateDescription *sub_vmsd;
1620
1621 subsection = qemu_get_byte(f);
1622 len = qemu_get_byte(f);
1623 qemu_get_buffer(f, (uint8_t *)idstr, len);
1624 idstr[len] = 0;
1625 version_id = qemu_get_be32(f);
1626
1627 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1628 if (sub_vmsd == NULL) {
1629 return -ENOENT;
1630 }
1631 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1632 if (ret) {
1633 return ret;
1634 }
1635 }
1636 return 0;
1637 }
1638
1639 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1640 void *opaque)
1641 {
1642 const VMStateSubsection *sub = vmsd->subsections;
1643
1644 while (sub && sub->needed) {
1645 if (sub->needed(opaque)) {
1646 const VMStateDescription *vmsd = sub->vmsd;
1647 uint8_t len;
1648
1649 qemu_put_byte(f, QEMU_VM_SUBSECTION);
1650 len = strlen(vmsd->name);
1651 qemu_put_byte(f, len);
1652 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1653 qemu_put_be32(f, vmsd->version_id);
1654 vmstate_save_state(f, vmsd, opaque);
1655 }
1656 sub++;
1657 }
1658 }
1659
1660 typedef struct LoadStateEntry {
1661 QLIST_ENTRY(LoadStateEntry) entry;
1662 SaveStateEntry *se;
1663 int section_id;
1664 int version_id;
1665 } LoadStateEntry;
1666
1667 int qemu_loadvm_state(QEMUFile *f)
1668 {
1669 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1670 QLIST_HEAD_INITIALIZER(loadvm_handlers);
1671 LoadStateEntry *le, *new_le;
1672 uint8_t section_type;
1673 unsigned int v;
1674 int ret;
1675
1676 v = qemu_get_be32(f);
1677 if (v != QEMU_VM_FILE_MAGIC)
1678 return -EINVAL;
1679
1680 v = qemu_get_be32(f);
1681 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1682 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1683 return -ENOTSUP;
1684 }
1685 if (v != QEMU_VM_FILE_VERSION)
1686 return -ENOTSUP;
1687
1688 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1689 uint32_t instance_id, version_id, section_id;
1690 SaveStateEntry *se;
1691 char idstr[257];
1692 int len;
1693
1694 switch (section_type) {
1695 case QEMU_VM_SECTION_START:
1696 case QEMU_VM_SECTION_FULL:
1697 /* Read section start */
1698 section_id = qemu_get_be32(f);
1699 len = qemu_get_byte(f);
1700 qemu_get_buffer(f, (uint8_t *)idstr, len);
1701 idstr[len] = 0;
1702 instance_id = qemu_get_be32(f);
1703 version_id = qemu_get_be32(f);
1704
1705 /* Find savevm section */
1706 se = find_se(idstr, instance_id);
1707 if (se == NULL) {
1708 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1709 ret = -EINVAL;
1710 goto out;
1711 }
1712
1713 /* Validate version */
1714 if (version_id > se->version_id) {
1715 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1716 version_id, idstr, se->version_id);
1717 ret = -EINVAL;
1718 goto out;
1719 }
1720
1721 /* Add entry */
1722 le = qemu_mallocz(sizeof(*le));
1723
1724 le->se = se;
1725 le->section_id = section_id;
1726 le->version_id = version_id;
1727 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1728
1729 ret = vmstate_load(f, le->se, le->version_id);
1730 if (ret < 0) {
1731 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1732 instance_id, idstr);
1733 goto out;
1734 }
1735 break;
1736 case QEMU_VM_SECTION_PART:
1737 case QEMU_VM_SECTION_END:
1738 section_id = qemu_get_be32(f);
1739
1740 QLIST_FOREACH(le, &loadvm_handlers, entry) {
1741 if (le->section_id == section_id) {
1742 break;
1743 }
1744 }
1745 if (le == NULL) {
1746 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1747 ret = -EINVAL;
1748 goto out;
1749 }
1750
1751 ret = vmstate_load(f, le->se, le->version_id);
1752 if (ret < 0) {
1753 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1754 section_id);
1755 goto out;
1756 }
1757 break;
1758 default:
1759 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1760 ret = -EINVAL;
1761 goto out;
1762 }
1763 }
1764
1765 cpu_synchronize_all_post_init();
1766
1767 ret = 0;
1768
1769 out:
1770 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1771 QLIST_REMOVE(le, entry);
1772 qemu_free(le);
1773 }
1774
1775 if (qemu_file_has_error(f))
1776 ret = -EIO;
1777
1778 return ret;
1779 }
1780
1781 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1782 const char *name)
1783 {
1784 QEMUSnapshotInfo *sn_tab, *sn;
1785 int nb_sns, i, ret;
1786
1787 ret = -ENOENT;
1788 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1789 if (nb_sns < 0)
1790 return ret;
1791 for(i = 0; i < nb_sns; i++) {
1792 sn = &sn_tab[i];
1793 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1794 *sn_info = *sn;
1795 ret = 0;
1796 break;
1797 }
1798 }
1799 qemu_free(sn_tab);
1800 return ret;
1801 }
1802
1803 /*
1804 * Deletes snapshots of a given name in all opened images.
1805 */
1806 static int del_existing_snapshots(Monitor *mon, const char *name)
1807 {
1808 BlockDriverState *bs;
1809 QEMUSnapshotInfo sn1, *snapshot = &sn1;
1810 int ret;
1811
1812 bs = NULL;
1813 while ((bs = bdrv_next(bs))) {
1814 if (bdrv_can_snapshot(bs) &&
1815 bdrv_snapshot_find(bs, snapshot, name) >= 0)
1816 {
1817 ret = bdrv_snapshot_delete(bs, name);
1818 if (ret < 0) {
1819 monitor_printf(mon,
1820 "Error while deleting snapshot on '%s'\n",
1821 bdrv_get_device_name(bs));
1822 return -1;
1823 }
1824 }
1825 }
1826
1827 return 0;
1828 }
1829
1830 void do_savevm(Monitor *mon, const QDict *qdict)
1831 {
1832 BlockDriverState *bs, *bs1;
1833 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1834 int ret;
1835 QEMUFile *f;
1836 int saved_vm_running;
1837 uint32_t vm_state_size;
1838 #ifdef _WIN32
1839 struct _timeb tb;
1840 #else
1841 struct timeval tv;
1842 #endif
1843 const char *name = qdict_get_try_str(qdict, "name");
1844
1845 /* Verify if there is a device that doesn't support snapshots and is writable */
1846 bs = NULL;
1847 while ((bs = bdrv_next(bs))) {
1848
1849 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1850 continue;
1851 }
1852
1853 if (!bdrv_can_snapshot(bs)) {
1854 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1855 bdrv_get_device_name(bs));
1856 return;
1857 }
1858 }
1859
1860 bs = bdrv_snapshots();
1861 if (!bs) {
1862 monitor_printf(mon, "No block device can accept snapshots\n");
1863 return;
1864 }
1865 /* ??? Should this occur after vm_stop? */
1866 qemu_aio_flush();
1867
1868 saved_vm_running = vm_running;
1869 vm_stop(0);
1870
1871 memset(sn, 0, sizeof(*sn));
1872 if (name) {
1873 ret = bdrv_snapshot_find(bs, old_sn, name);
1874 if (ret >= 0) {
1875 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1876 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1877 } else {
1878 pstrcpy(sn->name, sizeof(sn->name), name);
1879 }
1880 }
1881
1882 /* fill auxiliary fields */
1883 #ifdef _WIN32
1884 _ftime(&tb);
1885 sn->date_sec = tb.time;
1886 sn->date_nsec = tb.millitm * 1000000;
1887 #else
1888 gettimeofday(&tv, NULL);
1889 sn->date_sec = tv.tv_sec;
1890 sn->date_nsec = tv.tv_usec * 1000;
1891 #endif
1892 sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1893
1894 /* Delete old snapshots of the same name */
1895 if (name && del_existing_snapshots(mon, name) < 0) {
1896 goto the_end;
1897 }
1898
1899 /* save the VM state */
1900 f = qemu_fopen_bdrv(bs, 1);
1901 if (!f) {
1902 monitor_printf(mon, "Could not open VM state file\n");
1903 goto the_end;
1904 }
1905 ret = qemu_savevm_state(mon, f);
1906 vm_state_size = qemu_ftell(f);
1907 qemu_fclose(f);
1908 if (ret < 0) {
1909 monitor_printf(mon, "Error %d while writing VM\n", ret);
1910 goto the_end;
1911 }
1912
1913 /* create the snapshots */
1914
1915 bs1 = NULL;
1916 while ((bs1 = bdrv_next(bs1))) {
1917 if (bdrv_can_snapshot(bs1)) {
1918 /* Write VM state size only to the image that contains the state */
1919 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1920 ret = bdrv_snapshot_create(bs1, sn);
1921 if (ret < 0) {
1922 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1923 bdrv_get_device_name(bs1));
1924 }
1925 }
1926 }
1927
1928 the_end:
1929 if (saved_vm_running)
1930 vm_start();
1931 }
1932
1933 int load_vmstate(const char *name)
1934 {
1935 BlockDriverState *bs, *bs_vm_state;
1936 QEMUSnapshotInfo sn;
1937 QEMUFile *f;
1938 int ret;
1939
1940 bs_vm_state = bdrv_snapshots();
1941 if (!bs_vm_state) {
1942 error_report("No block device supports snapshots");
1943 return -ENOTSUP;
1944 }
1945
1946 /* Don't even try to load empty VM states */
1947 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
1948 if (ret < 0) {
1949 return ret;
1950 } else if (sn.vm_state_size == 0) {
1951 return -EINVAL;
1952 }
1953
1954 /* Verify if there is any device that doesn't support snapshots and is
1955 writable and check if the requested snapshot is available too. */
1956 bs = NULL;
1957 while ((bs = bdrv_next(bs))) {
1958
1959 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1960 continue;
1961 }
1962
1963 if (!bdrv_can_snapshot(bs)) {
1964 error_report("Device '%s' is writable but does not support snapshots.",
1965 bdrv_get_device_name(bs));
1966 return -ENOTSUP;
1967 }
1968
1969 ret = bdrv_snapshot_find(bs, &sn, name);
1970 if (ret < 0) {
1971 error_report("Device '%s' does not have the requested snapshot '%s'",
1972 bdrv_get_device_name(bs), name);
1973 return ret;
1974 }
1975 }
1976
1977 /* Flush all IO requests so they don't interfere with the new state. */
1978 qemu_aio_flush();
1979
1980 bs = NULL;
1981 while ((bs = bdrv_next(bs))) {
1982 if (bdrv_can_snapshot(bs)) {
1983 ret = bdrv_snapshot_goto(bs, name);
1984 if (ret < 0) {
1985 error_report("Error %d while activating snapshot '%s' on '%s'",
1986 ret, name, bdrv_get_device_name(bs));
1987 return ret;
1988 }
1989 }
1990 }
1991
1992 /* restore the VM state */
1993 f = qemu_fopen_bdrv(bs_vm_state, 0);
1994 if (!f) {
1995 error_report("Could not open VM state file");
1996 return -EINVAL;
1997 }
1998
1999 ret = qemu_loadvm_state(f);
2000
2001 qemu_fclose(f);
2002 if (ret < 0) {
2003 error_report("Error %d while loading VM state", ret);
2004 return ret;
2005 }
2006
2007 return 0;
2008 }
2009
2010 void do_delvm(Monitor *mon, const QDict *qdict)
2011 {
2012 BlockDriverState *bs, *bs1;
2013 int ret;
2014 const char *name = qdict_get_str(qdict, "name");
2015
2016 bs = bdrv_snapshots();
2017 if (!bs) {
2018 monitor_printf(mon, "No block device supports snapshots\n");
2019 return;
2020 }
2021
2022 bs1 = NULL;
2023 while ((bs1 = bdrv_next(bs1))) {
2024 if (bdrv_can_snapshot(bs1)) {
2025 ret = bdrv_snapshot_delete(bs1, name);
2026 if (ret < 0) {
2027 if (ret == -ENOTSUP)
2028 monitor_printf(mon,
2029 "Snapshots not supported on device '%s'\n",
2030 bdrv_get_device_name(bs1));
2031 else
2032 monitor_printf(mon, "Error %d while deleting snapshot on "
2033 "'%s'\n", ret, bdrv_get_device_name(bs1));
2034 }
2035 }
2036 }
2037 }
2038
2039 void do_info_snapshots(Monitor *mon)
2040 {
2041 BlockDriverState *bs, *bs1;
2042 QEMUSnapshotInfo *sn_tab, *sn;
2043 int nb_sns, i;
2044 char buf[256];
2045
2046 bs = bdrv_snapshots();
2047 if (!bs) {
2048 monitor_printf(mon, "No available block device supports snapshots\n");
2049 return;
2050 }
2051 monitor_printf(mon, "Snapshot devices:");
2052 bs1 = NULL;
2053 while ((bs1 = bdrv_next(bs1))) {
2054 if (bdrv_can_snapshot(bs1)) {
2055 if (bs == bs1)
2056 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
2057 }
2058 }
2059 monitor_printf(mon, "\n");
2060
2061 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2062 if (nb_sns < 0) {
2063 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2064 return;
2065 }
2066 monitor_printf(mon, "Snapshot list (from %s):\n",
2067 bdrv_get_device_name(bs));
2068 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2069 for(i = 0; i < nb_sns; i++) {
2070 sn = &sn_tab[i];
2071 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2072 }
2073 qemu_free(sn_tab);
2074 }
QEmu