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io-thread: make sure to initialize qemu_work_cond and qemu_cpu_cond
[qemu.git] / savevm.c
blob6d83b0f4dcab817fb75d2be73f868e1db02a599a
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 "audio/audio.h"
82 #include "migration.h"
83 #include "qemu_socket.h"
84 #include "qemu-queue.h"
85
86 #define SELF_ANNOUNCE_ROUNDS 5
87
88 #ifndef ETH_P_RARP
89 #define ETH_P_RARP 0x8035
90 #endif
91 #define ARP_HTYPE_ETH 0x0001
92 #define ARP_PTYPE_IP 0x0800
93 #define ARP_OP_REQUEST_REV 0x3
94
95 static int announce_self_create(uint8_t *buf,
96 uint8_t *mac_addr)
97 {
98 /* Ethernet header. */
99 memset(buf, 0xff, 6); /* destination MAC addr */
100 memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
101 *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
102
103 /* RARP header. */
104 *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
105 *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
106 *(buf + 18) = 6; /* hardware addr length (ethernet) */
107 *(buf + 19) = 4; /* protocol addr length (IPv4) */
108 *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
109 memcpy(buf + 22, mac_addr, 6); /* source hw addr */
110 memset(buf + 28, 0x00, 4); /* source protocol addr */
111 memcpy(buf + 32, mac_addr, 6); /* target hw addr */
112 memset(buf + 38, 0x00, 4); /* target protocol addr */
113
114 /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
115 memset(buf + 42, 0x00, 18);
116
117 return 60; /* len (FCS will be added by hardware) */
118 }
119
120 static void qemu_announce_self_iter(NICState *nic, void *opaque)
121 {
122 uint8_t buf[60];
123 int len;
124
125 len = announce_self_create(buf, nic->conf->macaddr.a);
126
127 qemu_send_packet_raw(&nic->nc, buf, len);
128 }
129
130
131 static void qemu_announce_self_once(void *opaque)
132 {
133 static int count = SELF_ANNOUNCE_ROUNDS;
134 QEMUTimer *timer = *(QEMUTimer **)opaque;
135
136 qemu_foreach_nic(qemu_announce_self_iter, NULL);
137
138 if (--count) {
139 /* delay 50ms, 150ms, 250ms, ... */
140 qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
141 50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
142 } else {
143 qemu_del_timer(timer);
144 qemu_free_timer(timer);
145 }
146 }
147
148 void qemu_announce_self(void)
149 {
150 static QEMUTimer *timer;
151 timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
152 qemu_announce_self_once(&timer);
153 }
154
155 /***********************************************************/
156 /* savevm/loadvm support */
157
158 #define IO_BUF_SIZE 32768
159
160 struct QEMUFile {
161 QEMUFilePutBufferFunc *put_buffer;
162 QEMUFileGetBufferFunc *get_buffer;
163 QEMUFileCloseFunc *close;
164 QEMUFileRateLimit *rate_limit;
165 QEMUFileSetRateLimit *set_rate_limit;
166 QEMUFileGetRateLimit *get_rate_limit;
167 void *opaque;
168 int is_write;
169
170 int64_t buf_offset; /* start of buffer when writing, end of buffer
171 when reading */
172 int buf_index;
173 int buf_size; /* 0 when writing */
174 uint8_t buf[IO_BUF_SIZE];
175
176 int has_error;
177 };
178
179 typedef struct QEMUFileStdio
180 {
181 FILE *stdio_file;
182 QEMUFile *file;
183 } QEMUFileStdio;
184
185 typedef struct QEMUFileSocket
186 {
187 int fd;
188 QEMUFile *file;
189 } QEMUFileSocket;
190
191 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
192 {
193 QEMUFileSocket *s = opaque;
194 ssize_t len;
195
196 do {
197 len = recv(s->fd, (void *)buf, size, 0);
198 } while (len == -1 && socket_error() == EINTR);
199
200 if (len == -1)
201 len = -socket_error();
202
203 return len;
204 }
205
206 static int socket_close(void *opaque)
207 {
208 QEMUFileSocket *s = opaque;
209 qemu_free(s);
210 return 0;
211 }
212
213 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
214 {
215 QEMUFileStdio *s = opaque;
216 return fwrite(buf, 1, size, s->stdio_file);
217 }
218
219 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
220 {
221 QEMUFileStdio *s = opaque;
222 FILE *fp = s->stdio_file;
223 int bytes;
224
225 do {
226 clearerr(fp);
227 bytes = fread(buf, 1, size, fp);
228 } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
229 return bytes;
230 }
231
232 static int stdio_pclose(void *opaque)
233 {
234 QEMUFileStdio *s = opaque;
235 int ret;
236 ret = pclose(s->stdio_file);
237 qemu_free(s);
238 return ret;
239 }
240
241 static int stdio_fclose(void *opaque)
242 {
243 QEMUFileStdio *s = opaque;
244 fclose(s->stdio_file);
245 qemu_free(s);
246 return 0;
247 }
248
249 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
250 {
251 QEMUFileStdio *s;
252
253 if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
254 fprintf(stderr, "qemu_popen: Argument validity check failed\n");
255 return NULL;
256 }
257
258 s = qemu_mallocz(sizeof(QEMUFileStdio));
259
260 s->stdio_file = stdio_file;
261
262 if(mode[0] == 'r') {
263 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
264 NULL, NULL, NULL);
265 } else {
266 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
267 NULL, NULL, NULL);
268 }
269 return s->file;
270 }
271
272 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
273 {
274 FILE *popen_file;
275
276 popen_file = popen(command, mode);
277 if(popen_file == NULL) {
278 return NULL;
279 }
280
281 return qemu_popen(popen_file, mode);
282 }
283
284 int qemu_stdio_fd(QEMUFile *f)
285 {
286 QEMUFileStdio *p;
287 int fd;
288
289 p = (QEMUFileStdio *)f->opaque;
290 fd = fileno(p->stdio_file);
291
292 return fd;
293 }
294
295 QEMUFile *qemu_fdopen(int fd, const char *mode)
296 {
297 QEMUFileStdio *s;
298
299 if (mode == NULL ||
300 (mode[0] != 'r' && mode[0] != 'w') ||
301 mode[1] != 'b' || mode[2] != 0) {
302 fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
303 return NULL;
304 }
305
306 s = qemu_mallocz(sizeof(QEMUFileStdio));
307 s->stdio_file = fdopen(fd, mode);
308 if (!s->stdio_file)
309 goto fail;
310
311 if(mode[0] == 'r') {
312 s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
313 NULL, NULL, NULL);
314 } else {
315 s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
316 NULL, NULL, NULL);
317 }
318 return s->file;
319
320 fail:
321 qemu_free(s);
322 return NULL;
323 }
324
325 QEMUFile *qemu_fopen_socket(int fd)
326 {
327 QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
328
329 s->fd = fd;
330 s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
331 NULL, NULL, NULL);
332 return s->file;
333 }
334
335 static int file_put_buffer(void *opaque, const uint8_t *buf,
336 int64_t pos, int size)
337 {
338 QEMUFileStdio *s = opaque;
339 fseek(s->stdio_file, pos, SEEK_SET);
340 return fwrite(buf, 1, size, s->stdio_file);
341 }
342
343 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
344 {
345 QEMUFileStdio *s = opaque;
346 fseek(s->stdio_file, pos, SEEK_SET);
347 return fread(buf, 1, size, s->stdio_file);
348 }
349
350 QEMUFile *qemu_fopen(const char *filename, const char *mode)
351 {
352 QEMUFileStdio *s;
353
354 if (mode == NULL ||
355 (mode[0] != 'r' && mode[0] != 'w') ||
356 mode[1] != 'b' || mode[2] != 0) {
357 fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
358 return NULL;
359 }
360
361 s = qemu_mallocz(sizeof(QEMUFileStdio));
362
363 s->stdio_file = fopen(filename, mode);
364 if (!s->stdio_file)
365 goto fail;
366
367 if(mode[0] == 'w') {
368 s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
369 NULL, NULL, NULL);
370 } else {
371 s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
372 NULL, NULL, NULL);
373 }
374 return s->file;
375 fail:
376 qemu_free(s);
377 return NULL;
378 }
379
380 static int block_put_buffer(void *opaque, const uint8_t *buf,
381 int64_t pos, int size)
382 {
383 bdrv_save_vmstate(opaque, buf, pos, size);
384 return size;
385 }
386
387 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
388 {
389 return bdrv_load_vmstate(opaque, buf, pos, size);
390 }
391
392 static int bdrv_fclose(void *opaque)
393 {
394 return 0;
395 }
396
397 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
398 {
399 if (is_writable)
400 return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
401 NULL, NULL, NULL);
402 return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
403 }
404
405 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
406 QEMUFileGetBufferFunc *get_buffer,
407 QEMUFileCloseFunc *close,
408 QEMUFileRateLimit *rate_limit,
409 QEMUFileSetRateLimit *set_rate_limit,
410 QEMUFileGetRateLimit *get_rate_limit)
411 {
412 QEMUFile *f;
413
414 f = qemu_mallocz(sizeof(QEMUFile));
415
416 f->opaque = opaque;
417 f->put_buffer = put_buffer;
418 f->get_buffer = get_buffer;
419 f->close = close;
420 f->rate_limit = rate_limit;
421 f->set_rate_limit = set_rate_limit;
422 f->get_rate_limit = get_rate_limit;
423 f->is_write = 0;
424
425 return f;
426 }
427
428 int qemu_file_has_error(QEMUFile *f)
429 {
430 return f->has_error;
431 }
432
433 void qemu_file_set_error(QEMUFile *f)
434 {
435 f->has_error = 1;
436 }
437
438 void qemu_fflush(QEMUFile *f)
439 {
440 if (!f->put_buffer)
441 return;
442
443 if (f->is_write && f->buf_index > 0) {
444 int len;
445
446 len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
447 if (len > 0)
448 f->buf_offset += f->buf_index;
449 else
450 f->has_error = 1;
451 f->buf_index = 0;
452 }
453 }
454
455 static void qemu_fill_buffer(QEMUFile *f)
456 {
457 int len;
458
459 if (!f->get_buffer)
460 return;
461
462 if (f->is_write)
463 abort();
464
465 len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
466 if (len > 0) {
467 f->buf_index = 0;
468 f->buf_size = len;
469 f->buf_offset += len;
470 } else if (len != -EAGAIN)
471 f->has_error = 1;
472 }
473
474 int qemu_fclose(QEMUFile *f)
475 {
476 int ret = 0;
477 qemu_fflush(f);
478 if (f->close)
479 ret = f->close(f->opaque);
480 qemu_free(f);
481 return ret;
482 }
483
484 void qemu_file_put_notify(QEMUFile *f)
485 {
486 f->put_buffer(f->opaque, NULL, 0, 0);
487 }
488
489 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
490 {
491 int l;
492
493 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
494 fprintf(stderr,
495 "Attempted to write to buffer while read buffer is not empty\n");
496 abort();
497 }
498
499 while (!f->has_error && size > 0) {
500 l = IO_BUF_SIZE - f->buf_index;
501 if (l > size)
502 l = size;
503 memcpy(f->buf + f->buf_index, buf, l);
504 f->is_write = 1;
505 f->buf_index += l;
506 buf += l;
507 size -= l;
508 if (f->buf_index >= IO_BUF_SIZE)
509 qemu_fflush(f);
510 }
511 }
512
513 void qemu_put_byte(QEMUFile *f, int v)
514 {
515 if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
516 fprintf(stderr,
517 "Attempted to write to buffer while read buffer is not empty\n");
518 abort();
519 }
520
521 f->buf[f->buf_index++] = v;
522 f->is_write = 1;
523 if (f->buf_index >= IO_BUF_SIZE)
524 qemu_fflush(f);
525 }
526
527 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
528 {
529 int size, l;
530
531 if (f->is_write)
532 abort();
533
534 size = size1;
535 while (size > 0) {
536 l = f->buf_size - f->buf_index;
537 if (l == 0) {
538 qemu_fill_buffer(f);
539 l = f->buf_size - f->buf_index;
540 if (l == 0)
541 break;
542 }
543 if (l > size)
544 l = size;
545 memcpy(buf, f->buf + f->buf_index, l);
546 f->buf_index += l;
547 buf += l;
548 size -= l;
549 }
550 return size1 - size;
551 }
552
553 static int qemu_peek_byte(QEMUFile *f)
554 {
555 if (f->is_write)
556 abort();
557
558 if (f->buf_index >= f->buf_size) {
559 qemu_fill_buffer(f);
560 if (f->buf_index >= f->buf_size)
561 return 0;
562 }
563 return f->buf[f->buf_index];
564 }
565
566 int qemu_get_byte(QEMUFile *f)
567 {
568 if (f->is_write)
569 abort();
570
571 if (f->buf_index >= f->buf_size) {
572 qemu_fill_buffer(f);
573 if (f->buf_index >= f->buf_size)
574 return 0;
575 }
576 return f->buf[f->buf_index++];
577 }
578
579 int64_t qemu_ftell(QEMUFile *f)
580 {
581 return f->buf_offset - f->buf_size + f->buf_index;
582 }
583
584 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
585 {
586 if (whence == SEEK_SET) {
587 /* nothing to do */
588 } else if (whence == SEEK_CUR) {
589 pos += qemu_ftell(f);
590 } else {
591 /* SEEK_END not supported */
592 return -1;
593 }
594 if (f->put_buffer) {
595 qemu_fflush(f);
596 f->buf_offset = pos;
597 } else {
598 f->buf_offset = pos;
599 f->buf_index = 0;
600 f->buf_size = 0;
601 }
602 return pos;
603 }
604
605 int qemu_file_rate_limit(QEMUFile *f)
606 {
607 if (f->rate_limit)
608 return f->rate_limit(f->opaque);
609
610 return 0;
611 }
612
613 int64_t qemu_file_get_rate_limit(QEMUFile *f)
614 {
615 if (f->get_rate_limit)
616 return f->get_rate_limit(f->opaque);
617
618 return 0;
619 }
620
621 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
622 {
623 /* any failed or completed migration keeps its state to allow probing of
624 * migration data, but has no associated file anymore */
625 if (f && f->set_rate_limit)
626 return f->set_rate_limit(f->opaque, new_rate);
627
628 return 0;
629 }
630
631 void qemu_put_be16(QEMUFile *f, unsigned int v)
632 {
633 qemu_put_byte(f, v >> 8);
634 qemu_put_byte(f, v);
635 }
636
637 void qemu_put_be32(QEMUFile *f, unsigned int v)
638 {
639 qemu_put_byte(f, v >> 24);
640 qemu_put_byte(f, v >> 16);
641 qemu_put_byte(f, v >> 8);
642 qemu_put_byte(f, v);
643 }
644
645 void qemu_put_be64(QEMUFile *f, uint64_t v)
646 {
647 qemu_put_be32(f, v >> 32);
648 qemu_put_be32(f, v);
649 }
650
651 unsigned int qemu_get_be16(QEMUFile *f)
652 {
653 unsigned int v;
654 v = qemu_get_byte(f) << 8;
655 v |= qemu_get_byte(f);
656 return v;
657 }
658
659 unsigned int qemu_get_be32(QEMUFile *f)
660 {
661 unsigned int v;
662 v = qemu_get_byte(f) << 24;
663 v |= qemu_get_byte(f) << 16;
664 v |= qemu_get_byte(f) << 8;
665 v |= qemu_get_byte(f);
666 return v;
667 }
668
669 uint64_t qemu_get_be64(QEMUFile *f)
670 {
671 uint64_t v;
672 v = (uint64_t)qemu_get_be32(f) << 32;
673 v |= qemu_get_be32(f);
674 return v;
675 }
676
677 /* bool */
678
679 static int get_bool(QEMUFile *f, void *pv, size_t size)
680 {
681 bool *v = pv;
682 *v = qemu_get_byte(f);
683 return 0;
684 }
685
686 static void put_bool(QEMUFile *f, void *pv, size_t size)
687 {
688 bool *v = pv;
689 qemu_put_byte(f, *v);
690 }
691
692 const VMStateInfo vmstate_info_bool = {
693 .name = "bool",
694 .get = get_bool,
695 .put = put_bool,
696 };
697
698 /* 8 bit int */
699
700 static int get_int8(QEMUFile *f, void *pv, size_t size)
701 {
702 int8_t *v = pv;
703 qemu_get_s8s(f, v);
704 return 0;
705 }
706
707 static void put_int8(QEMUFile *f, void *pv, size_t size)
708 {
709 int8_t *v = pv;
710 qemu_put_s8s(f, v);
711 }
712
713 const VMStateInfo vmstate_info_int8 = {
714 .name = "int8",
715 .get = get_int8,
716 .put = put_int8,
717 };
718
719 /* 16 bit int */
720
721 static int get_int16(QEMUFile *f, void *pv, size_t size)
722 {
723 int16_t *v = pv;
724 qemu_get_sbe16s(f, v);
725 return 0;
726 }
727
728 static void put_int16(QEMUFile *f, void *pv, size_t size)
729 {
730 int16_t *v = pv;
731 qemu_put_sbe16s(f, v);
732 }
733
734 const VMStateInfo vmstate_info_int16 = {
735 .name = "int16",
736 .get = get_int16,
737 .put = put_int16,
738 };
739
740 /* 32 bit int */
741
742 static int get_int32(QEMUFile *f, void *pv, size_t size)
743 {
744 int32_t *v = pv;
745 qemu_get_sbe32s(f, v);
746 return 0;
747 }
748
749 static void put_int32(QEMUFile *f, void *pv, size_t size)
750 {
751 int32_t *v = pv;
752 qemu_put_sbe32s(f, v);
753 }
754
755 const VMStateInfo vmstate_info_int32 = {
756 .name = "int32",
757 .get = get_int32,
758 .put = put_int32,
759 };
760
761 /* 32 bit int. See that the received value is the same than the one
762 in the field */
763
764 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
765 {
766 int32_t *v = pv;
767 int32_t v2;
768 qemu_get_sbe32s(f, &v2);
769
770 if (*v == v2)
771 return 0;
772 return -EINVAL;
773 }
774
775 const VMStateInfo vmstate_info_int32_equal = {
776 .name = "int32 equal",
777 .get = get_int32_equal,
778 .put = put_int32,
779 };
780
781 /* 32 bit int. See that the received value is the less or the same
782 than the one in the field */
783
784 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
785 {
786 int32_t *old = pv;
787 int32_t new;
788 qemu_get_sbe32s(f, &new);
789
790 if (*old <= new)
791 return 0;
792 return -EINVAL;
793 }
794
795 const VMStateInfo vmstate_info_int32_le = {
796 .name = "int32 equal",
797 .get = get_int32_le,
798 .put = put_int32,
799 };
800
801 /* 64 bit int */
802
803 static int get_int64(QEMUFile *f, void *pv, size_t size)
804 {
805 int64_t *v = pv;
806 qemu_get_sbe64s(f, v);
807 return 0;
808 }
809
810 static void put_int64(QEMUFile *f, void *pv, size_t size)
811 {
812 int64_t *v = pv;
813 qemu_put_sbe64s(f, v);
814 }
815
816 const VMStateInfo vmstate_info_int64 = {
817 .name = "int64",
818 .get = get_int64,
819 .put = put_int64,
820 };
821
822 /* 8 bit unsigned int */
823
824 static int get_uint8(QEMUFile *f, void *pv, size_t size)
825 {
826 uint8_t *v = pv;
827 qemu_get_8s(f, v);
828 return 0;
829 }
830
831 static void put_uint8(QEMUFile *f, void *pv, size_t size)
832 {
833 uint8_t *v = pv;
834 qemu_put_8s(f, v);
835 }
836
837 const VMStateInfo vmstate_info_uint8 = {
838 .name = "uint8",
839 .get = get_uint8,
840 .put = put_uint8,
841 };
842
843 /* 16 bit unsigned int */
844
845 static int get_uint16(QEMUFile *f, void *pv, size_t size)
846 {
847 uint16_t *v = pv;
848 qemu_get_be16s(f, v);
849 return 0;
850 }
851
852 static void put_uint16(QEMUFile *f, void *pv, size_t size)
853 {
854 uint16_t *v = pv;
855 qemu_put_be16s(f, v);
856 }
857
858 const VMStateInfo vmstate_info_uint16 = {
859 .name = "uint16",
860 .get = get_uint16,
861 .put = put_uint16,
862 };
863
864 /* 32 bit unsigned int */
865
866 static int get_uint32(QEMUFile *f, void *pv, size_t size)
867 {
868 uint32_t *v = pv;
869 qemu_get_be32s(f, v);
870 return 0;
871 }
872
873 static void put_uint32(QEMUFile *f, void *pv, size_t size)
874 {
875 uint32_t *v = pv;
876 qemu_put_be32s(f, v);
877 }
878
879 const VMStateInfo vmstate_info_uint32 = {
880 .name = "uint32",
881 .get = get_uint32,
882 .put = put_uint32,
883 };
884
885 /* 64 bit unsigned int */
886
887 static int get_uint64(QEMUFile *f, void *pv, size_t size)
888 {
889 uint64_t *v = pv;
890 qemu_get_be64s(f, v);
891 return 0;
892 }
893
894 static void put_uint64(QEMUFile *f, void *pv, size_t size)
895 {
896 uint64_t *v = pv;
897 qemu_put_be64s(f, v);
898 }
899
900 const VMStateInfo vmstate_info_uint64 = {
901 .name = "uint64",
902 .get = get_uint64,
903 .put = put_uint64,
904 };
905
906 /* 8 bit int. See that the received value is the same than the one
907 in the field */
908
909 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
910 {
911 uint8_t *v = pv;
912 uint8_t v2;
913 qemu_get_8s(f, &v2);
914
915 if (*v == v2)
916 return 0;
917 return -EINVAL;
918 }
919
920 const VMStateInfo vmstate_info_uint8_equal = {
921 .name = "uint8 equal",
922 .get = get_uint8_equal,
923 .put = put_uint8,
924 };
925
926 /* 16 bit unsigned int int. See that the received value is the same than the one
927 in the field */
928
929 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
930 {
931 uint16_t *v = pv;
932 uint16_t v2;
933 qemu_get_be16s(f, &v2);
934
935 if (*v == v2)
936 return 0;
937 return -EINVAL;
938 }
939
940 const VMStateInfo vmstate_info_uint16_equal = {
941 .name = "uint16 equal",
942 .get = get_uint16_equal,
943 .put = put_uint16,
944 };
945
946 /* timers */
947
948 static int get_timer(QEMUFile *f, void *pv, size_t size)
949 {
950 QEMUTimer *v = pv;
951 qemu_get_timer(f, v);
952 return 0;
953 }
954
955 static void put_timer(QEMUFile *f, void *pv, size_t size)
956 {
957 QEMUTimer *v = pv;
958 qemu_put_timer(f, v);
959 }
960
961 const VMStateInfo vmstate_info_timer = {
962 .name = "timer",
963 .get = get_timer,
964 .put = put_timer,
965 };
966
967 /* uint8_t buffers */
968
969 static int get_buffer(QEMUFile *f, void *pv, size_t size)
970 {
971 uint8_t *v = pv;
972 qemu_get_buffer(f, v, size);
973 return 0;
974 }
975
976 static void put_buffer(QEMUFile *f, void *pv, size_t size)
977 {
978 uint8_t *v = pv;
979 qemu_put_buffer(f, v, size);
980 }
981
982 const VMStateInfo vmstate_info_buffer = {
983 .name = "buffer",
984 .get = get_buffer,
985 .put = put_buffer,
986 };
987
988 /* unused buffers: space that was used for some fields that are
989 not usefull anymore */
990
991 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
992 {
993 uint8_t buf[1024];
994 int block_len;
995
996 while (size > 0) {
997 block_len = MIN(sizeof(buf), size);
998 size -= block_len;
999 qemu_get_buffer(f, buf, block_len);
1000 }
1001 return 0;
1002 }
1003
1004 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1005 {
1006 static const uint8_t buf[1024];
1007 int block_len;
1008
1009 while (size > 0) {
1010 block_len = MIN(sizeof(buf), size);
1011 size -= block_len;
1012 qemu_put_buffer(f, buf, block_len);
1013 }
1014 }
1015
1016 const VMStateInfo vmstate_info_unused_buffer = {
1017 .name = "unused_buffer",
1018 .get = get_unused_buffer,
1019 .put = put_unused_buffer,
1020 };
1021
1022 typedef struct CompatEntry {
1023 char idstr[256];
1024 int instance_id;
1025 } CompatEntry;
1026
1027 typedef struct SaveStateEntry {
1028 QTAILQ_ENTRY(SaveStateEntry) entry;
1029 char idstr[256];
1030 int instance_id;
1031 int alias_id;
1032 int version_id;
1033 int section_id;
1034 SaveSetParamsHandler *set_params;
1035 SaveLiveStateHandler *save_live_state;
1036 SaveStateHandler *save_state;
1037 LoadStateHandler *load_state;
1038 const VMStateDescription *vmsd;
1039 void *opaque;
1040 CompatEntry *compat;
1041 int no_migrate;
1042 } SaveStateEntry;
1043
1044
1045 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1046 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1047 static int global_section_id;
1048
1049 static int calculate_new_instance_id(const char *idstr)
1050 {
1051 SaveStateEntry *se;
1052 int instance_id = 0;
1053
1054 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1055 if (strcmp(idstr, se->idstr) == 0
1056 && instance_id <= se->instance_id) {
1057 instance_id = se->instance_id + 1;
1058 }
1059 }
1060 return instance_id;
1061 }
1062
1063 static int calculate_compat_instance_id(const char *idstr)
1064 {
1065 SaveStateEntry *se;
1066 int instance_id = 0;
1067
1068 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1069 if (!se->compat)
1070 continue;
1071
1072 if (strcmp(idstr, se->compat->idstr) == 0
1073 && instance_id <= se->compat->instance_id) {
1074 instance_id = se->compat->instance_id + 1;
1075 }
1076 }
1077 return instance_id;
1078 }
1079
1080 /* TODO: Individual devices generally have very little idea about the rest
1081 of the system, so instance_id should be removed/replaced.
1082 Meanwhile pass -1 as instance_id if you do not already have a clearly
1083 distinguishing id for all instances of your device class. */
1084 int register_savevm_live(DeviceState *dev,
1085 const char *idstr,
1086 int instance_id,
1087 int version_id,
1088 SaveSetParamsHandler *set_params,
1089 SaveLiveStateHandler *save_live_state,
1090 SaveStateHandler *save_state,
1091 LoadStateHandler *load_state,
1092 void *opaque)
1093 {
1094 SaveStateEntry *se;
1095
1096 se = qemu_mallocz(sizeof(SaveStateEntry));
1097 se->version_id = version_id;
1098 se->section_id = global_section_id++;
1099 se->set_params = set_params;
1100 se->save_live_state = save_live_state;
1101 se->save_state = save_state;
1102 se->load_state = load_state;
1103 se->opaque = opaque;
1104 se->vmsd = NULL;
1105 se->no_migrate = 0;
1106
1107 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1108 char *id = dev->parent_bus->info->get_dev_path(dev);
1109 if (id) {
1110 pstrcpy(se->idstr, sizeof(se->idstr), id);
1111 pstrcat(se->idstr, sizeof(se->idstr), "/");
1112 qemu_free(id);
1113
1114 se->compat = qemu_mallocz(sizeof(CompatEntry));
1115 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1116 se->compat->instance_id = instance_id == -1 ?
1117 calculate_compat_instance_id(idstr) : instance_id;
1118 instance_id = -1;
1119 }
1120 }
1121 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1122
1123 if (instance_id == -1) {
1124 se->instance_id = calculate_new_instance_id(se->idstr);
1125 } else {
1126 se->instance_id = instance_id;
1127 }
1128 assert(!se->compat || se->instance_id == 0);
1129 /* add at the end of list */
1130 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1131 return 0;
1132 }
1133
1134 int register_savevm(DeviceState *dev,
1135 const char *idstr,
1136 int instance_id,
1137 int version_id,
1138 SaveStateHandler *save_state,
1139 LoadStateHandler *load_state,
1140 void *opaque)
1141 {
1142 return register_savevm_live(dev, idstr, instance_id, version_id,
1143 NULL, NULL, save_state, load_state, opaque);
1144 }
1145
1146 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1147 {
1148 SaveStateEntry *se, *new_se;
1149 char id[256] = "";
1150
1151 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1152 char *path = dev->parent_bus->info->get_dev_path(dev);
1153 if (path) {
1154 pstrcpy(id, sizeof(id), path);
1155 pstrcat(id, sizeof(id), "/");
1156 qemu_free(path);
1157 }
1158 }
1159 pstrcat(id, sizeof(id), idstr);
1160
1161 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1162 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1163 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1164 if (se->compat) {
1165 qemu_free(se->compat);
1166 }
1167 qemu_free(se);
1168 }
1169 }
1170 }
1171
1172 /* mark a device as not to be migrated, that is the device should be
1173 unplugged before migration */
1174 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1175 void *opaque)
1176 {
1177 SaveStateEntry *se;
1178 char id[256] = "";
1179
1180 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1181 char *path = dev->parent_bus->info->get_dev_path(dev);
1182 if (path) {
1183 pstrcpy(id, sizeof(id), path);
1184 pstrcat(id, sizeof(id), "/");
1185 qemu_free(path);
1186 }
1187 }
1188 pstrcat(id, sizeof(id), idstr);
1189
1190 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1191 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1192 se->no_migrate = 1;
1193 }
1194 }
1195 }
1196
1197 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1198 const VMStateDescription *vmsd,
1199 void *opaque, int alias_id,
1200 int required_for_version)
1201 {
1202 SaveStateEntry *se;
1203
1204 /* If this triggers, alias support can be dropped for the vmsd. */
1205 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1206
1207 se = qemu_mallocz(sizeof(SaveStateEntry));
1208 se->version_id = vmsd->version_id;
1209 se->section_id = global_section_id++;
1210 se->save_live_state = NULL;
1211 se->save_state = NULL;
1212 se->load_state = NULL;
1213 se->opaque = opaque;
1214 se->vmsd = vmsd;
1215 se->alias_id = alias_id;
1216
1217 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1218 char *id = dev->parent_bus->info->get_dev_path(dev);
1219 if (id) {
1220 pstrcpy(se->idstr, sizeof(se->idstr), id);
1221 pstrcat(se->idstr, sizeof(se->idstr), "/");
1222 qemu_free(id);
1223
1224 se->compat = qemu_mallocz(sizeof(CompatEntry));
1225 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1226 se->compat->instance_id = instance_id == -1 ?
1227 calculate_compat_instance_id(vmsd->name) : instance_id;
1228 instance_id = -1;
1229 }
1230 }
1231 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1232
1233 if (instance_id == -1) {
1234 se->instance_id = calculate_new_instance_id(se->idstr);
1235 } else {
1236 se->instance_id = instance_id;
1237 }
1238 assert(!se->compat || se->instance_id == 0);
1239 /* add at the end of list */
1240 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1241 return 0;
1242 }
1243
1244 int vmstate_register(DeviceState *dev, int instance_id,
1245 const VMStateDescription *vmsd, void *opaque)
1246 {
1247 return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1248 opaque, -1, 0);
1249 }
1250
1251 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1252 void *opaque)
1253 {
1254 SaveStateEntry *se, *new_se;
1255
1256 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1257 if (se->vmsd == vmsd && se->opaque == opaque) {
1258 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1259 if (se->compat) {
1260 qemu_free(se->compat);
1261 }
1262 qemu_free(se);
1263 }
1264 }
1265 }
1266
1267 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1268 void *opaque);
1269 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1270 void *opaque);
1271
1272 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1273 void *opaque, int version_id)
1274 {
1275 VMStateField *field = vmsd->fields;
1276 int ret;
1277
1278 if (version_id > vmsd->version_id) {
1279 return -EINVAL;
1280 }
1281 if (version_id < vmsd->minimum_version_id_old) {
1282 return -EINVAL;
1283 }
1284 if (version_id < vmsd->minimum_version_id) {
1285 return vmsd->load_state_old(f, opaque, version_id);
1286 }
1287 if (vmsd->pre_load) {
1288 int ret = vmsd->pre_load(opaque);
1289 if (ret)
1290 return ret;
1291 }
1292 while(field->name) {
1293 if ((field->field_exists &&
1294 field->field_exists(opaque, version_id)) ||
1295 (!field->field_exists &&
1296 field->version_id <= version_id)) {
1297 void *base_addr = opaque + field->offset;
1298 int i, n_elems = 1;
1299 int size = field->size;
1300
1301 if (field->flags & VMS_VBUFFER) {
1302 size = *(int32_t *)(opaque+field->size_offset);
1303 if (field->flags & VMS_MULTIPLY) {
1304 size *= field->size;
1305 }
1306 }
1307 if (field->flags & VMS_ARRAY) {
1308 n_elems = field->num;
1309 } else if (field->flags & VMS_VARRAY_INT32) {
1310 n_elems = *(int32_t *)(opaque+field->num_offset);
1311 } else if (field->flags & VMS_VARRAY_UINT16) {
1312 n_elems = *(uint16_t *)(opaque+field->num_offset);
1313 }
1314 if (field->flags & VMS_POINTER) {
1315 base_addr = *(void **)base_addr + field->start;
1316 }
1317 for (i = 0; i < n_elems; i++) {
1318 void *addr = base_addr + size * i;
1319
1320 if (field->flags & VMS_ARRAY_OF_POINTER) {
1321 addr = *(void **)addr;
1322 }
1323 if (field->flags & VMS_STRUCT) {
1324 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1325 } else {
1326 ret = field->info->get(f, addr, size);
1327
1328 }
1329 if (ret < 0) {
1330 return ret;
1331 }
1332 }
1333 }
1334 field++;
1335 }
1336 ret = vmstate_subsection_load(f, vmsd, opaque);
1337 if (ret != 0) {
1338 return ret;
1339 }
1340 if (vmsd->post_load) {
1341 return vmsd->post_load(opaque, version_id);
1342 }
1343 return 0;
1344 }
1345
1346 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1347 void *opaque)
1348 {
1349 VMStateField *field = vmsd->fields;
1350
1351 if (vmsd->pre_save) {
1352 vmsd->pre_save(opaque);
1353 }
1354 while(field->name) {
1355 if (!field->field_exists ||
1356 field->field_exists(opaque, vmsd->version_id)) {
1357 void *base_addr = opaque + field->offset;
1358 int i, n_elems = 1;
1359 int size = field->size;
1360
1361 if (field->flags & VMS_VBUFFER) {
1362 size = *(int32_t *)(opaque+field->size_offset);
1363 if (field->flags & VMS_MULTIPLY) {
1364 size *= field->size;
1365 }
1366 }
1367 if (field->flags & VMS_ARRAY) {
1368 n_elems = field->num;
1369 } else if (field->flags & VMS_VARRAY_INT32) {
1370 n_elems = *(int32_t *)(opaque+field->num_offset);
1371 } else if (field->flags & VMS_VARRAY_UINT16) {
1372 n_elems = *(uint16_t *)(opaque+field->num_offset);
1373 }
1374 if (field->flags & VMS_POINTER) {
1375 base_addr = *(void **)base_addr + field->start;
1376 }
1377 for (i = 0; i < n_elems; i++) {
1378 void *addr = base_addr + size * i;
1379
1380 if (field->flags & VMS_ARRAY_OF_POINTER) {
1381 addr = *(void **)addr;
1382 }
1383 if (field->flags & VMS_STRUCT) {
1384 vmstate_save_state(f, field->vmsd, addr);
1385 } else {
1386 field->info->put(f, addr, size);
1387 }
1388 }
1389 }
1390 field++;
1391 }
1392 vmstate_subsection_save(f, vmsd, opaque);
1393 }
1394
1395 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1396 {
1397 if (!se->vmsd) { /* Old style */
1398 return se->load_state(f, se->opaque, version_id);
1399 }
1400 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1401 }
1402
1403 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1404 {
1405 if (!se->vmsd) { /* Old style */
1406 se->save_state(f, se->opaque);
1407 return;
1408 }
1409 vmstate_save_state(f,se->vmsd, se->opaque);
1410 }
1411
1412 #define QEMU_VM_FILE_MAGIC 0x5145564d
1413 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1414 #define QEMU_VM_FILE_VERSION 0x00000003
1415
1416 #define QEMU_VM_EOF 0x00
1417 #define QEMU_VM_SECTION_START 0x01
1418 #define QEMU_VM_SECTION_PART 0x02
1419 #define QEMU_VM_SECTION_END 0x03
1420 #define QEMU_VM_SECTION_FULL 0x04
1421 #define QEMU_VM_SUBSECTION 0x05
1422
1423 bool qemu_savevm_state_blocked(Monitor *mon)
1424 {
1425 SaveStateEntry *se;
1426
1427 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1428 if (se->no_migrate) {
1429 monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
1430 se->idstr);
1431 return true;
1432 }
1433 }
1434 return false;
1435 }
1436
1437 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1438 int shared)
1439 {
1440 SaveStateEntry *se;
1441
1442 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1443 if(se->set_params == NULL) {
1444 continue;
1445 }
1446 se->set_params(blk_enable, shared, se->opaque);
1447 }
1448
1449 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1450 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1451
1452 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1453 int len;
1454
1455 if (se->save_live_state == NULL)
1456 continue;
1457
1458 /* Section type */
1459 qemu_put_byte(f, QEMU_VM_SECTION_START);
1460 qemu_put_be32(f, se->section_id);
1461
1462 /* ID string */
1463 len = strlen(se->idstr);
1464 qemu_put_byte(f, len);
1465 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1466
1467 qemu_put_be32(f, se->instance_id);
1468 qemu_put_be32(f, se->version_id);
1469
1470 se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1471 }
1472
1473 if (qemu_file_has_error(f)) {
1474 qemu_savevm_state_cancel(mon, f);
1475 return -EIO;
1476 }
1477
1478 return 0;
1479 }
1480
1481 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1482 {
1483 SaveStateEntry *se;
1484 int ret = 1;
1485
1486 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1487 if (se->save_live_state == NULL)
1488 continue;
1489
1490 /* Section type */
1491 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1492 qemu_put_be32(f, se->section_id);
1493
1494 ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1495 if (!ret) {
1496 /* Do not proceed to the next vmstate before this one reported
1497 completion of the current stage. This serializes the migration
1498 and reduces the probability that a faster changing state is
1499 synchronized over and over again. */
1500 break;
1501 }
1502 }
1503
1504 if (ret)
1505 return 1;
1506
1507 if (qemu_file_has_error(f)) {
1508 qemu_savevm_state_cancel(mon, f);
1509 return -EIO;
1510 }
1511
1512 return 0;
1513 }
1514
1515 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1516 {
1517 SaveStateEntry *se;
1518
1519 cpu_synchronize_all_states();
1520
1521 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1522 if (se->save_live_state == NULL)
1523 continue;
1524
1525 /* Section type */
1526 qemu_put_byte(f, QEMU_VM_SECTION_END);
1527 qemu_put_be32(f, se->section_id);
1528
1529 se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1530 }
1531
1532 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1533 int len;
1534
1535 if (se->save_state == NULL && se->vmsd == NULL)
1536 continue;
1537
1538 /* Section type */
1539 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1540 qemu_put_be32(f, se->section_id);
1541
1542 /* ID string */
1543 len = strlen(se->idstr);
1544 qemu_put_byte(f, len);
1545 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1546
1547 qemu_put_be32(f, se->instance_id);
1548 qemu_put_be32(f, se->version_id);
1549
1550 vmstate_save(f, se);
1551 }
1552
1553 qemu_put_byte(f, QEMU_VM_EOF);
1554
1555 if (qemu_file_has_error(f))
1556 return -EIO;
1557
1558 return 0;
1559 }
1560
1561 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1562 {
1563 SaveStateEntry *se;
1564
1565 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1566 if (se->save_live_state) {
1567 se->save_live_state(mon, f, -1, se->opaque);
1568 }
1569 }
1570 }
1571
1572 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1573 {
1574 int saved_vm_running;
1575 int ret;
1576
1577 saved_vm_running = vm_running;
1578 vm_stop(0);
1579
1580 if (qemu_savevm_state_blocked(mon)) {
1581 ret = -EINVAL;
1582 goto out;
1583 }
1584
1585 ret = qemu_savevm_state_begin(mon, f, 0, 0);
1586 if (ret < 0)
1587 goto out;
1588
1589 do {
1590 ret = qemu_savevm_state_iterate(mon, f);
1591 if (ret < 0)
1592 goto out;
1593 } while (ret == 0);
1594
1595 ret = qemu_savevm_state_complete(mon, f);
1596
1597 out:
1598 if (qemu_file_has_error(f))
1599 ret = -EIO;
1600
1601 if (!ret && saved_vm_running)
1602 vm_start();
1603
1604 return ret;
1605 }
1606
1607 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1608 {
1609 SaveStateEntry *se;
1610
1611 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1612 if (!strcmp(se->idstr, idstr) &&
1613 (instance_id == se->instance_id ||
1614 instance_id == se->alias_id))
1615 return se;
1616 /* Migrating from an older version? */
1617 if (strstr(se->idstr, idstr) && se->compat) {
1618 if (!strcmp(se->compat->idstr, idstr) &&
1619 (instance_id == se->compat->instance_id ||
1620 instance_id == se->alias_id))
1621 return se;
1622 }
1623 }
1624 return NULL;
1625 }
1626
1627 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1628 {
1629 while(sub && sub->needed) {
1630 if (strcmp(idstr, sub->vmsd->name) == 0) {
1631 return sub->vmsd;
1632 }
1633 sub++;
1634 }
1635 return NULL;
1636 }
1637
1638 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1639 void *opaque)
1640 {
1641 const VMStateSubsection *sub = vmsd->subsections;
1642
1643 if (!sub || !sub->needed) {
1644 return 0;
1645 }
1646
1647 while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1648 char idstr[256];
1649 int ret;
1650 uint8_t version_id, len;
1651 const VMStateDescription *sub_vmsd;
1652
1653 qemu_get_byte(f); /* subsection */
1654 len = qemu_get_byte(f);
1655 qemu_get_buffer(f, (uint8_t *)idstr, len);
1656 idstr[len] = 0;
1657 version_id = qemu_get_be32(f);
1658
1659 sub_vmsd = vmstate_get_subsection(sub, idstr);
1660 if (sub_vmsd == NULL) {
1661 return -ENOENT;
1662 }
1663 assert(!sub_vmsd->subsections);
1664 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1665 if (ret) {
1666 return ret;
1667 }
1668 }
1669 return 0;
1670 }
1671
1672 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1673 void *opaque)
1674 {
1675 const VMStateSubsection *sub = vmsd->subsections;
1676
1677 while (sub && sub->needed) {
1678 if (sub->needed(opaque)) {
1679 const VMStateDescription *vmsd = sub->vmsd;
1680 uint8_t len;
1681
1682 qemu_put_byte(f, QEMU_VM_SUBSECTION);
1683 len = strlen(vmsd->name);
1684 qemu_put_byte(f, len);
1685 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1686 qemu_put_be32(f, vmsd->version_id);
1687 assert(!vmsd->subsections);
1688 vmstate_save_state(f, vmsd, opaque);
1689 }
1690 sub++;
1691 }
1692 }
1693
1694 typedef struct LoadStateEntry {
1695 QLIST_ENTRY(LoadStateEntry) entry;
1696 SaveStateEntry *se;
1697 int section_id;
1698 int version_id;
1699 } LoadStateEntry;
1700
1701 int qemu_loadvm_state(QEMUFile *f)
1702 {
1703 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1704 QLIST_HEAD_INITIALIZER(loadvm_handlers);
1705 LoadStateEntry *le, *new_le;
1706 uint8_t section_type;
1707 unsigned int v;
1708 int ret;
1709
1710 if (qemu_savevm_state_blocked(default_mon)) {
1711 return -EINVAL;
1712 }
1713
1714 v = qemu_get_be32(f);
1715 if (v != QEMU_VM_FILE_MAGIC)
1716 return -EINVAL;
1717
1718 v = qemu_get_be32(f);
1719 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1720 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1721 return -ENOTSUP;
1722 }
1723 if (v != QEMU_VM_FILE_VERSION)
1724 return -ENOTSUP;
1725
1726 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1727 uint32_t instance_id, version_id, section_id;
1728 SaveStateEntry *se;
1729 char idstr[257];
1730 int len;
1731
1732 switch (section_type) {
1733 case QEMU_VM_SECTION_START:
1734 case QEMU_VM_SECTION_FULL:
1735 /* Read section start */
1736 section_id = qemu_get_be32(f);
1737 len = qemu_get_byte(f);
1738 qemu_get_buffer(f, (uint8_t *)idstr, len);
1739 idstr[len] = 0;
1740 instance_id = qemu_get_be32(f);
1741 version_id = qemu_get_be32(f);
1742
1743 /* Find savevm section */
1744 se = find_se(idstr, instance_id);
1745 if (se == NULL) {
1746 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1747 ret = -EINVAL;
1748 goto out;
1749 }
1750
1751 /* Validate version */
1752 if (version_id > se->version_id) {
1753 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1754 version_id, idstr, se->version_id);
1755 ret = -EINVAL;
1756 goto out;
1757 }
1758
1759 /* Add entry */
1760 le = qemu_mallocz(sizeof(*le));
1761
1762 le->se = se;
1763 le->section_id = section_id;
1764 le->version_id = version_id;
1765 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1766
1767 ret = vmstate_load(f, le->se, le->version_id);
1768 if (ret < 0) {
1769 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1770 instance_id, idstr);
1771 goto out;
1772 }
1773 break;
1774 case QEMU_VM_SECTION_PART:
1775 case QEMU_VM_SECTION_END:
1776 section_id = qemu_get_be32(f);
1777
1778 QLIST_FOREACH(le, &loadvm_handlers, entry) {
1779 if (le->section_id == section_id) {
1780 break;
1781 }
1782 }
1783 if (le == NULL) {
1784 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1785 ret = -EINVAL;
1786 goto out;
1787 }
1788
1789 ret = vmstate_load(f, le->se, le->version_id);
1790 if (ret < 0) {
1791 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1792 section_id);
1793 goto out;
1794 }
1795 break;
1796 default:
1797 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1798 ret = -EINVAL;
1799 goto out;
1800 }
1801 }
1802
1803 cpu_synchronize_all_post_init();
1804
1805 ret = 0;
1806
1807 out:
1808 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1809 QLIST_REMOVE(le, entry);
1810 qemu_free(le);
1811 }
1812
1813 if (qemu_file_has_error(f))
1814 ret = -EIO;
1815
1816 return ret;
1817 }
1818
1819 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1820 const char *name)
1821 {
1822 QEMUSnapshotInfo *sn_tab, *sn;
1823 int nb_sns, i, ret;
1824
1825 ret = -ENOENT;
1826 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1827 if (nb_sns < 0)
1828 return ret;
1829 for(i = 0; i < nb_sns; i++) {
1830 sn = &sn_tab[i];
1831 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1832 *sn_info = *sn;
1833 ret = 0;
1834 break;
1835 }
1836 }
1837 qemu_free(sn_tab);
1838 return ret;
1839 }
1840
1841 /*
1842 * Deletes snapshots of a given name in all opened images.
1843 */
1844 static int del_existing_snapshots(Monitor *mon, const char *name)
1845 {
1846 BlockDriverState *bs;
1847 QEMUSnapshotInfo sn1, *snapshot = &sn1;
1848 int ret;
1849
1850 bs = NULL;
1851 while ((bs = bdrv_next(bs))) {
1852 if (bdrv_can_snapshot(bs) &&
1853 bdrv_snapshot_find(bs, snapshot, name) >= 0)
1854 {
1855 ret = bdrv_snapshot_delete(bs, name);
1856 if (ret < 0) {
1857 monitor_printf(mon,
1858 "Error while deleting snapshot on '%s'\n",
1859 bdrv_get_device_name(bs));
1860 return -1;
1861 }
1862 }
1863 }
1864
1865 return 0;
1866 }
1867
1868 void do_savevm(Monitor *mon, const QDict *qdict)
1869 {
1870 BlockDriverState *bs, *bs1;
1871 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1872 int ret;
1873 QEMUFile *f;
1874 int saved_vm_running;
1875 uint32_t vm_state_size;
1876 #ifdef _WIN32
1877 struct _timeb tb;
1878 struct tm *ptm;
1879 #else
1880 struct timeval tv;
1881 struct tm tm;
1882 #endif
1883 const char *name = qdict_get_try_str(qdict, "name");
1884
1885 /* Verify if there is a device that doesn't support snapshots and is writable */
1886 bs = NULL;
1887 while ((bs = bdrv_next(bs))) {
1888
1889 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1890 continue;
1891 }
1892
1893 if (!bdrv_can_snapshot(bs)) {
1894 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1895 bdrv_get_device_name(bs));
1896 return;
1897 }
1898 }
1899
1900 bs = bdrv_snapshots();
1901 if (!bs) {
1902 monitor_printf(mon, "No block device can accept snapshots\n");
1903 return;
1904 }
1905
1906 saved_vm_running = vm_running;
1907 vm_stop(0);
1908
1909 memset(sn, 0, sizeof(*sn));
1910
1911 /* fill auxiliary fields */
1912 #ifdef _WIN32
1913 _ftime(&tb);
1914 sn->date_sec = tb.time;
1915 sn->date_nsec = tb.millitm * 1000000;
1916 #else
1917 gettimeofday(&tv, NULL);
1918 sn->date_sec = tv.tv_sec;
1919 sn->date_nsec = tv.tv_usec * 1000;
1920 #endif
1921 sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1922
1923 if (name) {
1924 ret = bdrv_snapshot_find(bs, old_sn, name);
1925 if (ret >= 0) {
1926 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1927 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1928 } else {
1929 pstrcpy(sn->name, sizeof(sn->name), name);
1930 }
1931 } else {
1932 #ifdef _WIN32
1933 ptm = localtime(&tb.time);
1934 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
1935 #else
1936 /* cast below needed for OpenBSD where tv_sec is still 'long' */
1937 localtime_r((const time_t *)&tv.tv_sec, &tm);
1938 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
1939 #endif
1940 }
1941
1942 /* Delete old snapshots of the same name */
1943 if (name && del_existing_snapshots(mon, name) < 0) {
1944 goto the_end;
1945 }
1946
1947 /* save the VM state */
1948 f = qemu_fopen_bdrv(bs, 1);
1949 if (!f) {
1950 monitor_printf(mon, "Could not open VM state file\n");
1951 goto the_end;
1952 }
1953 ret = qemu_savevm_state(mon, f);
1954 vm_state_size = qemu_ftell(f);
1955 qemu_fclose(f);
1956 if (ret < 0) {
1957 monitor_printf(mon, "Error %d while writing VM\n", ret);
1958 goto the_end;
1959 }
1960
1961 /* create the snapshots */
1962
1963 bs1 = NULL;
1964 while ((bs1 = bdrv_next(bs1))) {
1965 if (bdrv_can_snapshot(bs1)) {
1966 /* Write VM state size only to the image that contains the state */
1967 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1968 ret = bdrv_snapshot_create(bs1, sn);
1969 if (ret < 0) {
1970 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1971 bdrv_get_device_name(bs1));
1972 }
1973 }
1974 }
1975
1976 the_end:
1977 if (saved_vm_running)
1978 vm_start();
1979 }
1980
1981 int load_vmstate(const char *name)
1982 {
1983 BlockDriverState *bs, *bs_vm_state;
1984 QEMUSnapshotInfo sn;
1985 QEMUFile *f;
1986 int ret;
1987
1988 bs_vm_state = bdrv_snapshots();
1989 if (!bs_vm_state) {
1990 error_report("No block device supports snapshots");
1991 return -ENOTSUP;
1992 }
1993
1994 /* Don't even try to load empty VM states */
1995 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
1996 if (ret < 0) {
1997 return ret;
1998 } else if (sn.vm_state_size == 0) {
1999 return -EINVAL;
2000 }
2001
2002 /* Verify if there is any device that doesn't support snapshots and is
2003 writable and check if the requested snapshot is available too. */
2004 bs = NULL;
2005 while ((bs = bdrv_next(bs))) {
2006
2007 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
2008 continue;
2009 }
2010
2011 if (!bdrv_can_snapshot(bs)) {
2012 error_report("Device '%s' is writable but does not support snapshots.",
2013 bdrv_get_device_name(bs));
2014 return -ENOTSUP;
2015 }
2016
2017 ret = bdrv_snapshot_find(bs, &sn, name);
2018 if (ret < 0) {
2019 error_report("Device '%s' does not have the requested snapshot '%s'",
2020 bdrv_get_device_name(bs), name);
2021 return ret;
2022 }
2023 }
2024
2025 /* Flush all IO requests so they don't interfere with the new state. */
2026 qemu_aio_flush();
2027
2028 bs = NULL;
2029 while ((bs = bdrv_next(bs))) {
2030 if (bdrv_can_snapshot(bs)) {
2031 ret = bdrv_snapshot_goto(bs, name);
2032 if (ret < 0) {
2033 error_report("Error %d while activating snapshot '%s' on '%s'",
2034 ret, name, bdrv_get_device_name(bs));
2035 return ret;
2036 }
2037 }
2038 }
2039
2040 /* restore the VM state */
2041 f = qemu_fopen_bdrv(bs_vm_state, 0);
2042 if (!f) {
2043 error_report("Could not open VM state file");
2044 return -EINVAL;
2045 }
2046
2047 ret = qemu_loadvm_state(f);
2048
2049 qemu_fclose(f);
2050 if (ret < 0) {
2051 error_report("Error %d while loading VM state", ret);
2052 return ret;
2053 }
2054
2055 return 0;
2056 }
2057
2058 void do_delvm(Monitor *mon, const QDict *qdict)
2059 {
2060 BlockDriverState *bs, *bs1;
2061 int ret;
2062 const char *name = qdict_get_str(qdict, "name");
2063
2064 bs = bdrv_snapshots();
2065 if (!bs) {
2066 monitor_printf(mon, "No block device supports snapshots\n");
2067 return;
2068 }
2069
2070 bs1 = NULL;
2071 while ((bs1 = bdrv_next(bs1))) {
2072 if (bdrv_can_snapshot(bs1)) {
2073 ret = bdrv_snapshot_delete(bs1, name);
2074 if (ret < 0) {
2075 if (ret == -ENOTSUP)
2076 monitor_printf(mon,
2077 "Snapshots not supported on device '%s'\n",
2078 bdrv_get_device_name(bs1));
2079 else
2080 monitor_printf(mon, "Error %d while deleting snapshot on "
2081 "'%s'\n", ret, bdrv_get_device_name(bs1));
2082 }
2083 }
2084 }
2085 }
2086
2087 void do_info_snapshots(Monitor *mon)
2088 {
2089 BlockDriverState *bs, *bs1;
2090 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2091 int nb_sns, i, ret, available;
2092 int total;
2093 int *available_snapshots;
2094 char buf[256];
2095
2096 bs = bdrv_snapshots();
2097 if (!bs) {
2098 monitor_printf(mon, "No available block device supports snapshots\n");
2099 return;
2100 }
2101
2102 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2103 if (nb_sns < 0) {
2104 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2105 return;
2106 }
2107
2108 if (nb_sns == 0) {
2109 monitor_printf(mon, "There is no snapshot available.\n");
2110 return;
2111 }
2112
2113 available_snapshots = qemu_mallocz(sizeof(int) * nb_sns);
2114 total = 0;
2115 for (i = 0; i < nb_sns; i++) {
2116 sn = &sn_tab[i];
2117 available = 1;
2118 bs1 = NULL;
2119
2120 while ((bs1 = bdrv_next(bs1))) {
2121 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2122 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2123 if (ret < 0) {
2124 available = 0;
2125 break;
2126 }
2127 }
2128 }
2129
2130 if (available) {
2131 available_snapshots[total] = i;
2132 total++;
2133 }
2134 }
2135
2136 if (total > 0) {
2137 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2138 for (i = 0; i < total; i++) {
2139 sn = &sn_tab[available_snapshots[i]];
2140 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2141 }
2142 } else {
2143 monitor_printf(mon, "There is no suitable snapshot available\n");
2144 }
2145
2146 qemu_free(sn_tab);
2147 qemu_free(available_snapshots);
2148
2149 }
QEmu