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[qemu/mdroth.git] / savevm.c
blob4e49765816d03e0b7b99d90c69bbfb753c7a1b02
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 /* bool */
679
680 static int get_bool(QEMUFile *f, void *pv, size_t size)
681 {
682 bool *v = pv;
683 *v = qemu_get_byte(f);
684 return 0;
685 }
686
687 static void put_bool(QEMUFile *f, void *pv, size_t size)
688 {
689 bool *v = pv;
690 qemu_put_byte(f, *v);
691 }
692
693 const VMStateInfo vmstate_info_bool = {
694 .name = "bool",
695 .get = get_bool,
696 .put = put_bool,
697 };
698
699 /* 8 bit int */
700
701 static int get_int8(QEMUFile *f, void *pv, size_t size)
702 {
703 int8_t *v = pv;
704 qemu_get_s8s(f, v);
705 return 0;
706 }
707
708 static void put_int8(QEMUFile *f, void *pv, size_t size)
709 {
710 int8_t *v = pv;
711 qemu_put_s8s(f, v);
712 }
713
714 const VMStateInfo vmstate_info_int8 = {
715 .name = "int8",
716 .get = get_int8,
717 .put = put_int8,
718 };
719
720 /* 16 bit int */
721
722 static int get_int16(QEMUFile *f, void *pv, size_t size)
723 {
724 int16_t *v = pv;
725 qemu_get_sbe16s(f, v);
726 return 0;
727 }
728
729 static void put_int16(QEMUFile *f, void *pv, size_t size)
730 {
731 int16_t *v = pv;
732 qemu_put_sbe16s(f, v);
733 }
734
735 const VMStateInfo vmstate_info_int16 = {
736 .name = "int16",
737 .get = get_int16,
738 .put = put_int16,
739 };
740
741 /* 32 bit int */
742
743 static int get_int32(QEMUFile *f, void *pv, size_t size)
744 {
745 int32_t *v = pv;
746 qemu_get_sbe32s(f, v);
747 return 0;
748 }
749
750 static void put_int32(QEMUFile *f, void *pv, size_t size)
751 {
752 int32_t *v = pv;
753 qemu_put_sbe32s(f, v);
754 }
755
756 const VMStateInfo vmstate_info_int32 = {
757 .name = "int32",
758 .get = get_int32,
759 .put = put_int32,
760 };
761
762 /* 32 bit int. See that the received value is the same than the one
763 in the field */
764
765 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
766 {
767 int32_t *v = pv;
768 int32_t v2;
769 qemu_get_sbe32s(f, &v2);
770
771 if (*v == v2)
772 return 0;
773 return -EINVAL;
774 }
775
776 const VMStateInfo vmstate_info_int32_equal = {
777 .name = "int32 equal",
778 .get = get_int32_equal,
779 .put = put_int32,
780 };
781
782 /* 32 bit int. See that the received value is the less or the same
783 than the one in the field */
784
785 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
786 {
787 int32_t *old = pv;
788 int32_t new;
789 qemu_get_sbe32s(f, &new);
790
791 if (*old <= new)
792 return 0;
793 return -EINVAL;
794 }
795
796 const VMStateInfo vmstate_info_int32_le = {
797 .name = "int32 equal",
798 .get = get_int32_le,
799 .put = put_int32,
800 };
801
802 /* 64 bit int */
803
804 static int get_int64(QEMUFile *f, void *pv, size_t size)
805 {
806 int64_t *v = pv;
807 qemu_get_sbe64s(f, v);
808 return 0;
809 }
810
811 static void put_int64(QEMUFile *f, void *pv, size_t size)
812 {
813 int64_t *v = pv;
814 qemu_put_sbe64s(f, v);
815 }
816
817 const VMStateInfo vmstate_info_int64 = {
818 .name = "int64",
819 .get = get_int64,
820 .put = put_int64,
821 };
822
823 /* 8 bit unsigned int */
824
825 static int get_uint8(QEMUFile *f, void *pv, size_t size)
826 {
827 uint8_t *v = pv;
828 qemu_get_8s(f, v);
829 return 0;
830 }
831
832 static void put_uint8(QEMUFile *f, void *pv, size_t size)
833 {
834 uint8_t *v = pv;
835 qemu_put_8s(f, v);
836 }
837
838 const VMStateInfo vmstate_info_uint8 = {
839 .name = "uint8",
840 .get = get_uint8,
841 .put = put_uint8,
842 };
843
844 /* 16 bit unsigned int */
845
846 static int get_uint16(QEMUFile *f, void *pv, size_t size)
847 {
848 uint16_t *v = pv;
849 qemu_get_be16s(f, v);
850 return 0;
851 }
852
853 static void put_uint16(QEMUFile *f, void *pv, size_t size)
854 {
855 uint16_t *v = pv;
856 qemu_put_be16s(f, v);
857 }
858
859 const VMStateInfo vmstate_info_uint16 = {
860 .name = "uint16",
861 .get = get_uint16,
862 .put = put_uint16,
863 };
864
865 /* 32 bit unsigned int */
866
867 static int get_uint32(QEMUFile *f, void *pv, size_t size)
868 {
869 uint32_t *v = pv;
870 qemu_get_be32s(f, v);
871 return 0;
872 }
873
874 static void put_uint32(QEMUFile *f, void *pv, size_t size)
875 {
876 uint32_t *v = pv;
877 qemu_put_be32s(f, v);
878 }
879
880 const VMStateInfo vmstate_info_uint32 = {
881 .name = "uint32",
882 .get = get_uint32,
883 .put = put_uint32,
884 };
885
886 /* 64 bit unsigned int */
887
888 static int get_uint64(QEMUFile *f, void *pv, size_t size)
889 {
890 uint64_t *v = pv;
891 qemu_get_be64s(f, v);
892 return 0;
893 }
894
895 static void put_uint64(QEMUFile *f, void *pv, size_t size)
896 {
897 uint64_t *v = pv;
898 qemu_put_be64s(f, v);
899 }
900
901 const VMStateInfo vmstate_info_uint64 = {
902 .name = "uint64",
903 .get = get_uint64,
904 .put = put_uint64,
905 };
906
907 /* 8 bit int. See that the received value is the same than the one
908 in the field */
909
910 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
911 {
912 uint8_t *v = pv;
913 uint8_t v2;
914 qemu_get_8s(f, &v2);
915
916 if (*v == v2)
917 return 0;
918 return -EINVAL;
919 }
920
921 const VMStateInfo vmstate_info_uint8_equal = {
922 .name = "uint8 equal",
923 .get = get_uint8_equal,
924 .put = put_uint8,
925 };
926
927 /* 16 bit unsigned int int. See that the received value is the same than the one
928 in the field */
929
930 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
931 {
932 uint16_t *v = pv;
933 uint16_t v2;
934 qemu_get_be16s(f, &v2);
935
936 if (*v == v2)
937 return 0;
938 return -EINVAL;
939 }
940
941 const VMStateInfo vmstate_info_uint16_equal = {
942 .name = "uint16 equal",
943 .get = get_uint16_equal,
944 .put = put_uint16,
945 };
946
947 /* timers */
948
949 static int get_timer(QEMUFile *f, void *pv, size_t size)
950 {
951 QEMUTimer *v = pv;
952 qemu_get_timer(f, v);
953 return 0;
954 }
955
956 static void put_timer(QEMUFile *f, void *pv, size_t size)
957 {
958 QEMUTimer *v = pv;
959 qemu_put_timer(f, v);
960 }
961
962 const VMStateInfo vmstate_info_timer = {
963 .name = "timer",
964 .get = get_timer,
965 .put = put_timer,
966 };
967
968 /* uint8_t buffers */
969
970 static int get_buffer(QEMUFile *f, void *pv, size_t size)
971 {
972 uint8_t *v = pv;
973 qemu_get_buffer(f, v, size);
974 return 0;
975 }
976
977 static void put_buffer(QEMUFile *f, void *pv, size_t size)
978 {
979 uint8_t *v = pv;
980 qemu_put_buffer(f, v, size);
981 }
982
983 const VMStateInfo vmstate_info_buffer = {
984 .name = "buffer",
985 .get = get_buffer,
986 .put = put_buffer,
987 };
988
989 /* unused buffers: space that was used for some fields that are
990 not usefull anymore */
991
992 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
993 {
994 uint8_t buf[1024];
995 int block_len;
996
997 while (size > 0) {
998 block_len = MIN(sizeof(buf), size);
999 size -= block_len;
1000 qemu_get_buffer(f, buf, block_len);
1001 }
1002 return 0;
1003 }
1004
1005 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1006 {
1007 static const uint8_t buf[1024];
1008 int block_len;
1009
1010 while (size > 0) {
1011 block_len = MIN(sizeof(buf), size);
1012 size -= block_len;
1013 qemu_put_buffer(f, buf, block_len);
1014 }
1015 }
1016
1017 const VMStateInfo vmstate_info_unused_buffer = {
1018 .name = "unused_buffer",
1019 .get = get_unused_buffer,
1020 .put = put_unused_buffer,
1021 };
1022
1023 typedef struct CompatEntry {
1024 char idstr[256];
1025 int instance_id;
1026 } CompatEntry;
1027
1028 typedef struct SaveStateEntry {
1029 QTAILQ_ENTRY(SaveStateEntry) entry;
1030 char idstr[256];
1031 int instance_id;
1032 int alias_id;
1033 int version_id;
1034 int section_id;
1035 SaveSetParamsHandler *set_params;
1036 SaveLiveStateHandler *save_live_state;
1037 SaveStateHandler *save_state;
1038 LoadStateHandler *load_state;
1039 const VMStateDescription *vmsd;
1040 void *opaque;
1041 CompatEntry *compat;
1042 int no_migrate;
1043 } SaveStateEntry;
1044
1045
1046 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1047 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1048 static int global_section_id;
1049
1050 static int calculate_new_instance_id(const char *idstr)
1051 {
1052 SaveStateEntry *se;
1053 int instance_id = 0;
1054
1055 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1056 if (strcmp(idstr, se->idstr) == 0
1057 && instance_id <= se->instance_id) {
1058 instance_id = se->instance_id + 1;
1059 }
1060 }
1061 return instance_id;
1062 }
1063
1064 static int calculate_compat_instance_id(const char *idstr)
1065 {
1066 SaveStateEntry *se;
1067 int instance_id = 0;
1068
1069 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1070 if (!se->compat)
1071 continue;
1072
1073 if (strcmp(idstr, se->compat->idstr) == 0
1074 && instance_id <= se->compat->instance_id) {
1075 instance_id = se->compat->instance_id + 1;
1076 }
1077 }
1078 return instance_id;
1079 }
1080
1081 /* TODO: Individual devices generally have very little idea about the rest
1082 of the system, so instance_id should be removed/replaced.
1083 Meanwhile pass -1 as instance_id if you do not already have a clearly
1084 distinguishing id for all instances of your device class. */
1085 int register_savevm_live(DeviceState *dev,
1086 const char *idstr,
1087 int instance_id,
1088 int version_id,
1089 SaveSetParamsHandler *set_params,
1090 SaveLiveStateHandler *save_live_state,
1091 SaveStateHandler *save_state,
1092 LoadStateHandler *load_state,
1093 void *opaque)
1094 {
1095 SaveStateEntry *se;
1096
1097 se = qemu_mallocz(sizeof(SaveStateEntry));
1098 se->version_id = version_id;
1099 se->section_id = global_section_id++;
1100 se->set_params = set_params;
1101 se->save_live_state = save_live_state;
1102 se->save_state = save_state;
1103 se->load_state = load_state;
1104 se->opaque = opaque;
1105 se->vmsd = NULL;
1106 se->no_migrate = 0;
1107
1108 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1109 char *id = dev->parent_bus->info->get_dev_path(dev);
1110 if (id) {
1111 pstrcpy(se->idstr, sizeof(se->idstr), id);
1112 pstrcat(se->idstr, sizeof(se->idstr), "/");
1113 qemu_free(id);
1114
1115 se->compat = qemu_mallocz(sizeof(CompatEntry));
1116 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1117 se->compat->instance_id = instance_id == -1 ?
1118 calculate_compat_instance_id(idstr) : instance_id;
1119 instance_id = -1;
1120 }
1121 }
1122 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1123
1124 if (instance_id == -1) {
1125 se->instance_id = calculate_new_instance_id(se->idstr);
1126 } else {
1127 se->instance_id = instance_id;
1128 }
1129 assert(!se->compat || se->instance_id == 0);
1130 /* add at the end of list */
1131 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1132 return 0;
1133 }
1134
1135 int register_savevm(DeviceState *dev,
1136 const char *idstr,
1137 int instance_id,
1138 int version_id,
1139 SaveStateHandler *save_state,
1140 LoadStateHandler *load_state,
1141 void *opaque)
1142 {
1143 return register_savevm_live(dev, idstr, instance_id, version_id,
1144 NULL, NULL, save_state, load_state, opaque);
1145 }
1146
1147 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1148 {
1149 SaveStateEntry *se, *new_se;
1150 char id[256] = "";
1151
1152 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1153 char *path = dev->parent_bus->info->get_dev_path(dev);
1154 if (path) {
1155 pstrcpy(id, sizeof(id), path);
1156 pstrcat(id, sizeof(id), "/");
1157 qemu_free(path);
1158 }
1159 }
1160 pstrcat(id, sizeof(id), idstr);
1161
1162 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1163 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1164 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1165 if (se->compat) {
1166 qemu_free(se->compat);
1167 }
1168 qemu_free(se);
1169 }
1170 }
1171 }
1172
1173 /* mark a device as not to be migrated, that is the device should be
1174 unplugged before migration */
1175 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1176 void *opaque)
1177 {
1178 SaveStateEntry *se;
1179 char id[256] = "";
1180
1181 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1182 char *path = dev->parent_bus->info->get_dev_path(dev);
1183 if (path) {
1184 pstrcpy(id, sizeof(id), path);
1185 pstrcat(id, sizeof(id), "/");
1186 qemu_free(path);
1187 }
1188 }
1189 pstrcat(id, sizeof(id), idstr);
1190
1191 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1192 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1193 se->no_migrate = 1;
1194 }
1195 }
1196 }
1197
1198 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1199 const VMStateDescription *vmsd,
1200 void *opaque, int alias_id,
1201 int required_for_version)
1202 {
1203 SaveStateEntry *se;
1204
1205 /* If this triggers, alias support can be dropped for the vmsd. */
1206 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1207
1208 se = qemu_mallocz(sizeof(SaveStateEntry));
1209 se->version_id = vmsd->version_id;
1210 se->section_id = global_section_id++;
1211 se->save_live_state = NULL;
1212 se->save_state = NULL;
1213 se->load_state = NULL;
1214 se->opaque = opaque;
1215 se->vmsd = vmsd;
1216 se->alias_id = alias_id;
1217
1218 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1219 char *id = dev->parent_bus->info->get_dev_path(dev);
1220 if (id) {
1221 pstrcpy(se->idstr, sizeof(se->idstr), id);
1222 pstrcat(se->idstr, sizeof(se->idstr), "/");
1223 qemu_free(id);
1224
1225 se->compat = qemu_mallocz(sizeof(CompatEntry));
1226 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1227 se->compat->instance_id = instance_id == -1 ?
1228 calculate_compat_instance_id(vmsd->name) : instance_id;
1229 instance_id = -1;
1230 }
1231 }
1232 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1233
1234 if (instance_id == -1) {
1235 se->instance_id = calculate_new_instance_id(se->idstr);
1236 } else {
1237 se->instance_id = instance_id;
1238 }
1239 assert(!se->compat || se->instance_id == 0);
1240 /* add at the end of list */
1241 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1242 return 0;
1243 }
1244
1245 int vmstate_register(DeviceState *dev, int instance_id,
1246 const VMStateDescription *vmsd, void *opaque)
1247 {
1248 return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1249 opaque, -1, 0);
1250 }
1251
1252 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1253 void *opaque)
1254 {
1255 SaveStateEntry *se, *new_se;
1256
1257 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1258 if (se->vmsd == vmsd && se->opaque == opaque) {
1259 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1260 if (se->compat) {
1261 qemu_free(se->compat);
1262 }
1263 qemu_free(se);
1264 }
1265 }
1266 }
1267
1268 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1269 void *opaque);
1270 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1271 void *opaque);
1272
1273 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1274 void *opaque, int version_id)
1275 {
1276 VMStateField *field = vmsd->fields;
1277 int ret;
1278
1279 if (version_id > vmsd->version_id) {
1280 return -EINVAL;
1281 }
1282 if (version_id < vmsd->minimum_version_id_old) {
1283 return -EINVAL;
1284 }
1285 if (version_id < vmsd->minimum_version_id) {
1286 return vmsd->load_state_old(f, opaque, version_id);
1287 }
1288 if (vmsd->pre_load) {
1289 int ret = vmsd->pre_load(opaque);
1290 if (ret)
1291 return ret;
1292 }
1293 while(field->name) {
1294 if ((field->field_exists &&
1295 field->field_exists(opaque, version_id)) ||
1296 (!field->field_exists &&
1297 field->version_id <= version_id)) {
1298 void *base_addr = opaque + field->offset;
1299 int i, n_elems = 1;
1300 int size = field->size;
1301
1302 if (field->flags & VMS_VBUFFER) {
1303 size = *(int32_t *)(opaque+field->size_offset);
1304 if (field->flags & VMS_MULTIPLY) {
1305 size *= field->size;
1306 }
1307 }
1308 if (field->flags & VMS_ARRAY) {
1309 n_elems = field->num;
1310 } else if (field->flags & VMS_VARRAY_INT32) {
1311 n_elems = *(int32_t *)(opaque+field->num_offset);
1312 } else if (field->flags & VMS_VARRAY_UINT16) {
1313 n_elems = *(uint16_t *)(opaque+field->num_offset);
1314 }
1315 if (field->flags & VMS_POINTER) {
1316 base_addr = *(void **)base_addr + field->start;
1317 }
1318 for (i = 0; i < n_elems; i++) {
1319 void *addr = base_addr + size * i;
1320
1321 if (field->flags & VMS_ARRAY_OF_POINTER) {
1322 addr = *(void **)addr;
1323 }
1324 if (field->flags & VMS_STRUCT) {
1325 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1326 } else {
1327 ret = field->info->get(f, addr, size);
1328
1329 }
1330 if (ret < 0) {
1331 return ret;
1332 }
1333 }
1334 }
1335 field++;
1336 }
1337 ret = vmstate_subsection_load(f, vmsd, opaque);
1338 if (ret != 0) {
1339 return ret;
1340 }
1341 if (vmsd->post_load) {
1342 return vmsd->post_load(opaque, version_id);
1343 }
1344 return 0;
1345 }
1346
1347 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1348 void *opaque)
1349 {
1350 VMStateField *field = vmsd->fields;
1351
1352 if (vmsd->pre_save) {
1353 vmsd->pre_save(opaque);
1354 }
1355 while(field->name) {
1356 if (!field->field_exists ||
1357 field->field_exists(opaque, vmsd->version_id)) {
1358 void *base_addr = opaque + field->offset;
1359 int i, n_elems = 1;
1360 int size = field->size;
1361
1362 if (field->flags & VMS_VBUFFER) {
1363 size = *(int32_t *)(opaque+field->size_offset);
1364 if (field->flags & VMS_MULTIPLY) {
1365 size *= field->size;
1366 }
1367 }
1368 if (field->flags & VMS_ARRAY) {
1369 n_elems = field->num;
1370 } else if (field->flags & VMS_VARRAY_INT32) {
1371 n_elems = *(int32_t *)(opaque+field->num_offset);
1372 } else if (field->flags & VMS_VARRAY_UINT16) {
1373 n_elems = *(uint16_t *)(opaque+field->num_offset);
1374 }
1375 if (field->flags & VMS_POINTER) {
1376 base_addr = *(void **)base_addr + field->start;
1377 }
1378 for (i = 0; i < n_elems; i++) {
1379 void *addr = base_addr + size * i;
1380
1381 if (field->flags & VMS_ARRAY_OF_POINTER) {
1382 addr = *(void **)addr;
1383 }
1384 if (field->flags & VMS_STRUCT) {
1385 vmstate_save_state(f, field->vmsd, addr);
1386 } else {
1387 field->info->put(f, addr, size);
1388 }
1389 }
1390 }
1391 field++;
1392 }
1393 vmstate_subsection_save(f, vmsd, opaque);
1394 }
1395
1396 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1397 {
1398 if (!se->vmsd) { /* Old style */
1399 return se->load_state(f, se->opaque, version_id);
1400 }
1401 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1402 }
1403
1404 static int vmstate_save(QEMUFile *f, SaveStateEntry *se)
1405 {
1406 if (se->no_migrate) {
1407 return -1;
1408 }
1409
1410 if (!se->vmsd) { /* Old style */
1411 se->save_state(f, se->opaque);
1412 return 0;
1413 }
1414 vmstate_save_state(f,se->vmsd, se->opaque);
1415
1416 return 0;
1417 }
1418
1419 #define QEMU_VM_FILE_MAGIC 0x5145564d
1420 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1421 #define QEMU_VM_FILE_VERSION 0x00000003
1422
1423 #define QEMU_VM_EOF 0x00
1424 #define QEMU_VM_SECTION_START 0x01
1425 #define QEMU_VM_SECTION_PART 0x02
1426 #define QEMU_VM_SECTION_END 0x03
1427 #define QEMU_VM_SECTION_FULL 0x04
1428 #define QEMU_VM_SUBSECTION 0x05
1429
1430 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1431 int shared)
1432 {
1433 SaveStateEntry *se;
1434
1435 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1436 if(se->set_params == NULL) {
1437 continue;
1438 }
1439 se->set_params(blk_enable, shared, se->opaque);
1440 }
1441
1442 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1443 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1444
1445 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1446 int len;
1447
1448 if (se->save_live_state == NULL)
1449 continue;
1450
1451 /* Section type */
1452 qemu_put_byte(f, QEMU_VM_SECTION_START);
1453 qemu_put_be32(f, se->section_id);
1454
1455 /* ID string */
1456 len = strlen(se->idstr);
1457 qemu_put_byte(f, len);
1458 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1459
1460 qemu_put_be32(f, se->instance_id);
1461 qemu_put_be32(f, se->version_id);
1462
1463 se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1464 }
1465
1466 if (qemu_file_has_error(f)) {
1467 qemu_savevm_state_cancel(mon, f);
1468 return -EIO;
1469 }
1470
1471 return 0;
1472 }
1473
1474 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1475 {
1476 SaveStateEntry *se;
1477 int ret = 1;
1478
1479 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1480 if (se->save_live_state == NULL)
1481 continue;
1482
1483 /* Section type */
1484 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1485 qemu_put_be32(f, se->section_id);
1486
1487 ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1488 if (!ret) {
1489 /* Do not proceed to the next vmstate before this one reported
1490 completion of the current stage. This serializes the migration
1491 and reduces the probability that a faster changing state is
1492 synchronized over and over again. */
1493 break;
1494 }
1495 }
1496
1497 if (ret)
1498 return 1;
1499
1500 if (qemu_file_has_error(f)) {
1501 qemu_savevm_state_cancel(mon, f);
1502 return -EIO;
1503 }
1504
1505 return 0;
1506 }
1507
1508 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1509 {
1510 SaveStateEntry *se;
1511 int r;
1512
1513 cpu_synchronize_all_states();
1514
1515 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1516 if (se->save_live_state == NULL)
1517 continue;
1518
1519 /* Section type */
1520 qemu_put_byte(f, QEMU_VM_SECTION_END);
1521 qemu_put_be32(f, se->section_id);
1522
1523 se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1524 }
1525
1526 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1527 int len;
1528
1529 if (se->save_state == NULL && se->vmsd == NULL)
1530 continue;
1531
1532 /* Section type */
1533 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1534 qemu_put_be32(f, se->section_id);
1535
1536 /* ID string */
1537 len = strlen(se->idstr);
1538 qemu_put_byte(f, len);
1539 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1540
1541 qemu_put_be32(f, se->instance_id);
1542 qemu_put_be32(f, se->version_id);
1543
1544 r = vmstate_save(f, se);
1545 if (r < 0) {
1546 monitor_printf(mon, "cannot migrate with device '%s'\n", se->idstr);
1547 return r;
1548 }
1549 }
1550
1551 qemu_put_byte(f, QEMU_VM_EOF);
1552
1553 if (qemu_file_has_error(f))
1554 return -EIO;
1555
1556 return 0;
1557 }
1558
1559 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1560 {
1561 SaveStateEntry *se;
1562
1563 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1564 if (se->save_live_state) {
1565 se->save_live_state(mon, f, -1, se->opaque);
1566 }
1567 }
1568 }
1569
1570 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1571 {
1572 int saved_vm_running;
1573 int ret;
1574
1575 saved_vm_running = vm_running;
1576 vm_stop(0);
1577
1578 bdrv_flush_all();
1579
1580 ret = qemu_savevm_state_begin(mon, f, 0, 0);
1581 if (ret < 0)
1582 goto out;
1583
1584 do {
1585 ret = qemu_savevm_state_iterate(mon, f);
1586 if (ret < 0)
1587 goto out;
1588 } while (ret == 0);
1589
1590 ret = qemu_savevm_state_complete(mon, f);
1591
1592 out:
1593 if (qemu_file_has_error(f))
1594 ret = -EIO;
1595
1596 if (!ret && saved_vm_running)
1597 vm_start();
1598
1599 return ret;
1600 }
1601
1602 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1603 {
1604 SaveStateEntry *se;
1605
1606 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1607 if (!strcmp(se->idstr, idstr) &&
1608 (instance_id == se->instance_id ||
1609 instance_id == se->alias_id))
1610 return se;
1611 /* Migrating from an older version? */
1612 if (strstr(se->idstr, idstr) && se->compat) {
1613 if (!strcmp(se->compat->idstr, idstr) &&
1614 (instance_id == se->compat->instance_id ||
1615 instance_id == se->alias_id))
1616 return se;
1617 }
1618 }
1619 return NULL;
1620 }
1621
1622 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1623 {
1624 while(sub && sub->needed) {
1625 if (strcmp(idstr, sub->vmsd->name) == 0) {
1626 return sub->vmsd;
1627 }
1628 sub++;
1629 }
1630 return NULL;
1631 }
1632
1633 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1634 void *opaque)
1635 {
1636 while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1637 char idstr[256];
1638 int ret;
1639 uint8_t version_id, len;
1640 const VMStateDescription *sub_vmsd;
1641
1642 qemu_get_byte(f); /* subsection */
1643 len = qemu_get_byte(f);
1644 qemu_get_buffer(f, (uint8_t *)idstr, len);
1645 idstr[len] = 0;
1646 version_id = qemu_get_be32(f);
1647
1648 sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1649 if (sub_vmsd == NULL) {
1650 return -ENOENT;
1651 }
1652 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1653 if (ret) {
1654 return ret;
1655 }
1656 }
1657 return 0;
1658 }
1659
1660 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1661 void *opaque)
1662 {
1663 const VMStateSubsection *sub = vmsd->subsections;
1664
1665 while (sub && sub->needed) {
1666 if (sub->needed(opaque)) {
1667 const VMStateDescription *vmsd = sub->vmsd;
1668 uint8_t len;
1669
1670 qemu_put_byte(f, QEMU_VM_SUBSECTION);
1671 len = strlen(vmsd->name);
1672 qemu_put_byte(f, len);
1673 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1674 qemu_put_be32(f, vmsd->version_id);
1675 vmstate_save_state(f, vmsd, opaque);
1676 }
1677 sub++;
1678 }
1679 }
1680
1681 typedef struct LoadStateEntry {
1682 QLIST_ENTRY(LoadStateEntry) entry;
1683 SaveStateEntry *se;
1684 int section_id;
1685 int version_id;
1686 } LoadStateEntry;
1687
1688 int qemu_loadvm_state(QEMUFile *f)
1689 {
1690 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1691 QLIST_HEAD_INITIALIZER(loadvm_handlers);
1692 LoadStateEntry *le, *new_le;
1693 uint8_t section_type;
1694 unsigned int v;
1695 int ret;
1696
1697 v = qemu_get_be32(f);
1698 if (v != QEMU_VM_FILE_MAGIC)
1699 return -EINVAL;
1700
1701 v = qemu_get_be32(f);
1702 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1703 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1704 return -ENOTSUP;
1705 }
1706 if (v != QEMU_VM_FILE_VERSION)
1707 return -ENOTSUP;
1708
1709 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1710 uint32_t instance_id, version_id, section_id;
1711 SaveStateEntry *se;
1712 char idstr[257];
1713 int len;
1714
1715 switch (section_type) {
1716 case QEMU_VM_SECTION_START:
1717 case QEMU_VM_SECTION_FULL:
1718 /* Read section start */
1719 section_id = qemu_get_be32(f);
1720 len = qemu_get_byte(f);
1721 qemu_get_buffer(f, (uint8_t *)idstr, len);
1722 idstr[len] = 0;
1723 instance_id = qemu_get_be32(f);
1724 version_id = qemu_get_be32(f);
1725
1726 /* Find savevm section */
1727 se = find_se(idstr, instance_id);
1728 if (se == NULL) {
1729 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1730 ret = -EINVAL;
1731 goto out;
1732 }
1733
1734 /* Validate version */
1735 if (version_id > se->version_id) {
1736 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1737 version_id, idstr, se->version_id);
1738 ret = -EINVAL;
1739 goto out;
1740 }
1741
1742 /* Add entry */
1743 le = qemu_mallocz(sizeof(*le));
1744
1745 le->se = se;
1746 le->section_id = section_id;
1747 le->version_id = version_id;
1748 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1749
1750 ret = vmstate_load(f, le->se, le->version_id);
1751 if (ret < 0) {
1752 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1753 instance_id, idstr);
1754 goto out;
1755 }
1756 break;
1757 case QEMU_VM_SECTION_PART:
1758 case QEMU_VM_SECTION_END:
1759 section_id = qemu_get_be32(f);
1760
1761 QLIST_FOREACH(le, &loadvm_handlers, entry) {
1762 if (le->section_id == section_id) {
1763 break;
1764 }
1765 }
1766 if (le == NULL) {
1767 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1768 ret = -EINVAL;
1769 goto out;
1770 }
1771
1772 ret = vmstate_load(f, le->se, le->version_id);
1773 if (ret < 0) {
1774 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1775 section_id);
1776 goto out;
1777 }
1778 break;
1779 default:
1780 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1781 ret = -EINVAL;
1782 goto out;
1783 }
1784 }
1785
1786 cpu_synchronize_all_post_init();
1787
1788 ret = 0;
1789
1790 out:
1791 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1792 QLIST_REMOVE(le, entry);
1793 qemu_free(le);
1794 }
1795
1796 if (qemu_file_has_error(f))
1797 ret = -EIO;
1798
1799 return ret;
1800 }
1801
1802 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1803 const char *name)
1804 {
1805 QEMUSnapshotInfo *sn_tab, *sn;
1806 int nb_sns, i, ret;
1807
1808 ret = -ENOENT;
1809 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1810 if (nb_sns < 0)
1811 return ret;
1812 for(i = 0; i < nb_sns; i++) {
1813 sn = &sn_tab[i];
1814 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1815 *sn_info = *sn;
1816 ret = 0;
1817 break;
1818 }
1819 }
1820 qemu_free(sn_tab);
1821 return ret;
1822 }
1823
1824 /*
1825 * Deletes snapshots of a given name in all opened images.
1826 */
1827 static int del_existing_snapshots(Monitor *mon, const char *name)
1828 {
1829 BlockDriverState *bs;
1830 QEMUSnapshotInfo sn1, *snapshot = &sn1;
1831 int ret;
1832
1833 bs = NULL;
1834 while ((bs = bdrv_next(bs))) {
1835 if (bdrv_can_snapshot(bs) &&
1836 bdrv_snapshot_find(bs, snapshot, name) >= 0)
1837 {
1838 ret = bdrv_snapshot_delete(bs, name);
1839 if (ret < 0) {
1840 monitor_printf(mon,
1841 "Error while deleting snapshot on '%s'\n",
1842 bdrv_get_device_name(bs));
1843 return -1;
1844 }
1845 }
1846 }
1847
1848 return 0;
1849 }
1850
1851 void do_savevm(Monitor *mon, const QDict *qdict)
1852 {
1853 BlockDriverState *bs, *bs1;
1854 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1855 int ret;
1856 QEMUFile *f;
1857 int saved_vm_running;
1858 uint32_t vm_state_size;
1859 #ifdef _WIN32
1860 struct _timeb tb;
1861 struct tm *ptm;
1862 #else
1863 struct timeval tv;
1864 struct tm tm;
1865 #endif
1866 const char *name = qdict_get_try_str(qdict, "name");
1867
1868 /* Verify if there is a device that doesn't support snapshots and is writable */
1869 bs = NULL;
1870 while ((bs = bdrv_next(bs))) {
1871
1872 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1873 continue;
1874 }
1875
1876 if (!bdrv_can_snapshot(bs)) {
1877 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1878 bdrv_get_device_name(bs));
1879 return;
1880 }
1881 }
1882
1883 bs = bdrv_snapshots();
1884 if (!bs) {
1885 monitor_printf(mon, "No block device can accept snapshots\n");
1886 return;
1887 }
1888 /* ??? Should this occur after vm_stop? */
1889 qemu_aio_flush();
1890
1891 saved_vm_running = vm_running;
1892 vm_stop(0);
1893
1894 memset(sn, 0, sizeof(*sn));
1895
1896 /* fill auxiliary fields */
1897 #ifdef _WIN32
1898 _ftime(&tb);
1899 sn->date_sec = tb.time;
1900 sn->date_nsec = tb.millitm * 1000000;
1901 #else
1902 gettimeofday(&tv, NULL);
1903 sn->date_sec = tv.tv_sec;
1904 sn->date_nsec = tv.tv_usec * 1000;
1905 #endif
1906 sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1907
1908 if (name) {
1909 ret = bdrv_snapshot_find(bs, old_sn, name);
1910 if (ret >= 0) {
1911 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1912 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1913 } else {
1914 pstrcpy(sn->name, sizeof(sn->name), name);
1915 }
1916 } else {
1917 #ifdef _WIN32
1918 ptm = localtime(&tb.time);
1919 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
1920 #else
1921 /* cast below needed for OpenBSD where tv_sec is still 'long' */
1922 localtime_r((const time_t *)&tv.tv_sec, &tm);
1923 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
1924 #endif
1925 }
1926
1927 /* Delete old snapshots of the same name */
1928 if (name && del_existing_snapshots(mon, name) < 0) {
1929 goto the_end;
1930 }
1931
1932 /* save the VM state */
1933 f = qemu_fopen_bdrv(bs, 1);
1934 if (!f) {
1935 monitor_printf(mon, "Could not open VM state file\n");
1936 goto the_end;
1937 }
1938 ret = qemu_savevm_state(mon, f);
1939 vm_state_size = qemu_ftell(f);
1940 qemu_fclose(f);
1941 if (ret < 0) {
1942 monitor_printf(mon, "Error %d while writing VM\n", ret);
1943 goto the_end;
1944 }
1945
1946 /* create the snapshots */
1947
1948 bs1 = NULL;
1949 while ((bs1 = bdrv_next(bs1))) {
1950 if (bdrv_can_snapshot(bs1)) {
1951 /* Write VM state size only to the image that contains the state */
1952 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1953 ret = bdrv_snapshot_create(bs1, sn);
1954 if (ret < 0) {
1955 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1956 bdrv_get_device_name(bs1));
1957 }
1958 }
1959 }
1960
1961 the_end:
1962 if (saved_vm_running)
1963 vm_start();
1964 }
1965
1966 int load_vmstate(const char *name)
1967 {
1968 BlockDriverState *bs, *bs_vm_state;
1969 QEMUSnapshotInfo sn;
1970 QEMUFile *f;
1971 int ret;
1972
1973 bs_vm_state = bdrv_snapshots();
1974 if (!bs_vm_state) {
1975 error_report("No block device supports snapshots");
1976 return -ENOTSUP;
1977 }
1978
1979 /* Don't even try to load empty VM states */
1980 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
1981 if (ret < 0) {
1982 return ret;
1983 } else if (sn.vm_state_size == 0) {
1984 return -EINVAL;
1985 }
1986
1987 /* Verify if there is any device that doesn't support snapshots and is
1988 writable and check if the requested snapshot is available too. */
1989 bs = NULL;
1990 while ((bs = bdrv_next(bs))) {
1991
1992 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1993 continue;
1994 }
1995
1996 if (!bdrv_can_snapshot(bs)) {
1997 error_report("Device '%s' is writable but does not support snapshots.",
1998 bdrv_get_device_name(bs));
1999 return -ENOTSUP;
2000 }
2001
2002 ret = bdrv_snapshot_find(bs, &sn, name);
2003 if (ret < 0) {
2004 error_report("Device '%s' does not have the requested snapshot '%s'",
2005 bdrv_get_device_name(bs), name);
2006 return ret;
2007 }
2008 }
2009
2010 /* Flush all IO requests so they don't interfere with the new state. */
2011 qemu_aio_flush();
2012
2013 bs = NULL;
2014 while ((bs = bdrv_next(bs))) {
2015 if (bdrv_can_snapshot(bs)) {
2016 ret = bdrv_snapshot_goto(bs, name);
2017 if (ret < 0) {
2018 error_report("Error %d while activating snapshot '%s' on '%s'",
2019 ret, name, bdrv_get_device_name(bs));
2020 return ret;
2021 }
2022 }
2023 }
2024
2025 /* restore the VM state */
2026 f = qemu_fopen_bdrv(bs_vm_state, 0);
2027 if (!f) {
2028 error_report("Could not open VM state file");
2029 return -EINVAL;
2030 }
2031
2032 ret = qemu_loadvm_state(f);
2033
2034 qemu_fclose(f);
2035 if (ret < 0) {
2036 error_report("Error %d while loading VM state", ret);
2037 return ret;
2038 }
2039
2040 return 0;
2041 }
2042
2043 void do_delvm(Monitor *mon, const QDict *qdict)
2044 {
2045 BlockDriverState *bs, *bs1;
2046 int ret;
2047 const char *name = qdict_get_str(qdict, "name");
2048
2049 bs = bdrv_snapshots();
2050 if (!bs) {
2051 monitor_printf(mon, "No block device supports snapshots\n");
2052 return;
2053 }
2054
2055 bs1 = NULL;
2056 while ((bs1 = bdrv_next(bs1))) {
2057 if (bdrv_can_snapshot(bs1)) {
2058 ret = bdrv_snapshot_delete(bs1, name);
2059 if (ret < 0) {
2060 if (ret == -ENOTSUP)
2061 monitor_printf(mon,
2062 "Snapshots not supported on device '%s'\n",
2063 bdrv_get_device_name(bs1));
2064 else
2065 monitor_printf(mon, "Error %d while deleting snapshot on "
2066 "'%s'\n", ret, bdrv_get_device_name(bs1));
2067 }
2068 }
2069 }
2070 }
2071
2072 void do_info_snapshots(Monitor *mon)
2073 {
2074 BlockDriverState *bs, *bs1;
2075 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2076 int nb_sns, i, ret, available;
2077 int total;
2078 int *available_snapshots;
2079 char buf[256];
2080
2081 bs = bdrv_snapshots();
2082 if (!bs) {
2083 monitor_printf(mon, "No available block device supports snapshots\n");
2084 return;
2085 }
2086
2087 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2088 if (nb_sns < 0) {
2089 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2090 return;
2091 }
2092
2093 if (nb_sns == 0) {
2094 monitor_printf(mon, "There is no snapshot available.\n");
2095 return;
2096 }
2097
2098 available_snapshots = qemu_mallocz(sizeof(int) * nb_sns);
2099 total = 0;
2100 for (i = 0; i < nb_sns; i++) {
2101 sn = &sn_tab[i];
2102 available = 1;
2103 bs1 = NULL;
2104
2105 while ((bs1 = bdrv_next(bs1))) {
2106 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2107 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2108 if (ret < 0) {
2109 available = 0;
2110 break;
2111 }
2112 }
2113 }
2114
2115 if (available) {
2116 available_snapshots[total] = i;
2117 total++;
2118 }
2119 }
2120
2121 if (total > 0) {
2122 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2123 for (i = 0; i < total; i++) {
2124 sn = &sn_tab[available_snapshots[i]];
2125 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2126 }
2127 } else {
2128 monitor_printf(mon, "There is no suitable snapshot available\n");
2129 }
2130
2131 qemu_free(sn_tab);
2132 qemu_free(available_snapshots);
2133
2134 }
various patches