?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'upstream-merge' into next
[qemu-dev-zwu.git] / savevm.c
blob939845c82576faf69fea6a410b4ab2504d22b977
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 <time.h>
27 #include <errno.h>
28 #include <sys/time.h>
29 #include <zlib.h>
30
31 /* Needed early for CONFIG_BSD etc. */
32 #include "config-host.h"
33
34 #ifndef _WIN32
35 #include <sys/times.h>
36 #include <sys/wait.h>
37 #include <termios.h>
38 #include <sys/mman.h>
39 #include <sys/ioctl.h>
40 #include <sys/resource.h>
41 #include <sys/socket.h>
42 #include <netinet/in.h>
43 #include <net/if.h>
44 #include <arpa/inet.h>
45 #include <dirent.h>
46 #include <netdb.h>
47 #include <sys/select.h>
48 #ifdef CONFIG_BSD
49 #include <sys/stat.h>
50 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
51 #include <libutil.h>
52 #else
53 #include <util.h>
54 #endif
55 #ifdef __linux__
56 #include <pty.h>
57 #include <malloc.h>
58 #include <linux/rtc.h>
59 #endif
60 #endif
61 #endif
62
63 #ifdef _WIN32
64 #include <windows.h>
65 #include <malloc.h>
66 #include <sys/timeb.h>
67 #include <mmsystem.h>
68 #define getopt_long_only getopt_long
69 #define memalign(align, size) malloc(size)
70 #endif
71
72 #include "qemu-common.h"
73 #include "hw/hw.h"
74 #include "hw/qdev.h"
75 #include "net.h"
76 #include "monitor.h"
77 #include "sysemu.h"
78 #include "qemu-timer.h"
79 #include "qemu-char.h"
80 #include "audio/audio.h"
81 #include "migration.h"
82 #include "qemu_socket.h"
83 #include "qemu-queue.h"
84 #include "cpus.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_ms(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_ms(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 /* 32 bit uint. See that the received value is the same than the one
886 in the field */
887
888 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
889 {
890 uint32_t *v = pv;
891 uint32_t v2;
892 qemu_get_be32s(f, &v2);
893
894 if (*v == v2) {
895 return 0;
896 }
897 return -EINVAL;
898 }
899
900 const VMStateInfo vmstate_info_uint32_equal = {
901 .name = "uint32 equal",
902 .get = get_uint32_equal,
903 .put = put_uint32,
904 };
905
906 /* 64 bit unsigned int */
907
908 static int get_uint64(QEMUFile *f, void *pv, size_t size)
909 {
910 uint64_t *v = pv;
911 qemu_get_be64s(f, v);
912 return 0;
913 }
914
915 static void put_uint64(QEMUFile *f, void *pv, size_t size)
916 {
917 uint64_t *v = pv;
918 qemu_put_be64s(f, v);
919 }
920
921 const VMStateInfo vmstate_info_uint64 = {
922 .name = "uint64",
923 .get = get_uint64,
924 .put = put_uint64,
925 };
926
927 /* 8 bit int. See that the received value is the same than the one
928 in the field */
929
930 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
931 {
932 uint8_t *v = pv;
933 uint8_t v2;
934 qemu_get_8s(f, &v2);
935
936 if (*v == v2)
937 return 0;
938 return -EINVAL;
939 }
940
941 const VMStateInfo vmstate_info_uint8_equal = {
942 .name = "uint8 equal",
943 .get = get_uint8_equal,
944 .put = put_uint8,
945 };
946
947 /* 16 bit unsigned int int. See that the received value is the same than the one
948 in the field */
949
950 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
951 {
952 uint16_t *v = pv;
953 uint16_t v2;
954 qemu_get_be16s(f, &v2);
955
956 if (*v == v2)
957 return 0;
958 return -EINVAL;
959 }
960
961 const VMStateInfo vmstate_info_uint16_equal = {
962 .name = "uint16 equal",
963 .get = get_uint16_equal,
964 .put = put_uint16,
965 };
966
967 /* timers */
968
969 static int get_timer(QEMUFile *f, void *pv, size_t size)
970 {
971 QEMUTimer *v = pv;
972 qemu_get_timer(f, v);
973 return 0;
974 }
975
976 static void put_timer(QEMUFile *f, void *pv, size_t size)
977 {
978 QEMUTimer *v = pv;
979 qemu_put_timer(f, v);
980 }
981
982 const VMStateInfo vmstate_info_timer = {
983 .name = "timer",
984 .get = get_timer,
985 .put = put_timer,
986 };
987
988 /* uint8_t buffers */
989
990 static int get_buffer(QEMUFile *f, void *pv, size_t size)
991 {
992 uint8_t *v = pv;
993 qemu_get_buffer(f, v, size);
994 return 0;
995 }
996
997 static void put_buffer(QEMUFile *f, void *pv, size_t size)
998 {
999 uint8_t *v = pv;
1000 qemu_put_buffer(f, v, size);
1001 }
1002
1003 const VMStateInfo vmstate_info_buffer = {
1004 .name = "buffer",
1005 .get = get_buffer,
1006 .put = put_buffer,
1007 };
1008
1009 /* unused buffers: space that was used for some fields that are
1010 not useful anymore */
1011
1012 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1013 {
1014 uint8_t buf[1024];
1015 int block_len;
1016
1017 while (size > 0) {
1018 block_len = MIN(sizeof(buf), size);
1019 size -= block_len;
1020 qemu_get_buffer(f, buf, block_len);
1021 }
1022 return 0;
1023 }
1024
1025 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1026 {
1027 static const uint8_t buf[1024];
1028 int block_len;
1029
1030 while (size > 0) {
1031 block_len = MIN(sizeof(buf), size);
1032 size -= block_len;
1033 qemu_put_buffer(f, buf, block_len);
1034 }
1035 }
1036
1037 const VMStateInfo vmstate_info_unused_buffer = {
1038 .name = "unused_buffer",
1039 .get = get_unused_buffer,
1040 .put = put_unused_buffer,
1041 };
1042
1043 typedef struct CompatEntry {
1044 char idstr[256];
1045 int instance_id;
1046 } CompatEntry;
1047
1048 typedef struct SaveStateEntry {
1049 QTAILQ_ENTRY(SaveStateEntry) entry;
1050 char idstr[256];
1051 int instance_id;
1052 int alias_id;
1053 int version_id;
1054 int section_id;
1055 SaveSetParamsHandler *set_params;
1056 SaveLiveStateHandler *save_live_state;
1057 SaveStateHandler *save_state;
1058 LoadStateHandler *load_state;
1059 const VMStateDescription *vmsd;
1060 void *opaque;
1061 CompatEntry *compat;
1062 int no_migrate;
1063 } SaveStateEntry;
1064
1065
1066 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1067 QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1068 static int global_section_id;
1069
1070 static int calculate_new_instance_id(const char *idstr)
1071 {
1072 SaveStateEntry *se;
1073 int instance_id = 0;
1074
1075 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1076 if (strcmp(idstr, se->idstr) == 0
1077 && instance_id <= se->instance_id) {
1078 instance_id = se->instance_id + 1;
1079 }
1080 }
1081 return instance_id;
1082 }
1083
1084 static int calculate_compat_instance_id(const char *idstr)
1085 {
1086 SaveStateEntry *se;
1087 int instance_id = 0;
1088
1089 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1090 if (!se->compat)
1091 continue;
1092
1093 if (strcmp(idstr, se->compat->idstr) == 0
1094 && instance_id <= se->compat->instance_id) {
1095 instance_id = se->compat->instance_id + 1;
1096 }
1097 }
1098 return instance_id;
1099 }
1100
1101 /* TODO: Individual devices generally have very little idea about the rest
1102 of the system, so instance_id should be removed/replaced.
1103 Meanwhile pass -1 as instance_id if you do not already have a clearly
1104 distinguishing id for all instances of your device class. */
1105 int register_savevm_live(DeviceState *dev,
1106 const char *idstr,
1107 int instance_id,
1108 int version_id,
1109 SaveSetParamsHandler *set_params,
1110 SaveLiveStateHandler *save_live_state,
1111 SaveStateHandler *save_state,
1112 LoadStateHandler *load_state,
1113 void *opaque)
1114 {
1115 SaveStateEntry *se;
1116
1117 se = qemu_mallocz(sizeof(SaveStateEntry));
1118 se->version_id = version_id;
1119 se->section_id = global_section_id++;
1120 se->set_params = set_params;
1121 se->save_live_state = save_live_state;
1122 se->save_state = save_state;
1123 se->load_state = load_state;
1124 se->opaque = opaque;
1125 se->vmsd = NULL;
1126 se->no_migrate = 0;
1127
1128 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1129 char *id = dev->parent_bus->info->get_dev_path(dev);
1130 if (id) {
1131 pstrcpy(se->idstr, sizeof(se->idstr), id);
1132 pstrcat(se->idstr, sizeof(se->idstr), "/");
1133 qemu_free(id);
1134
1135 se->compat = qemu_mallocz(sizeof(CompatEntry));
1136 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1137 se->compat->instance_id = instance_id == -1 ?
1138 calculate_compat_instance_id(idstr) : instance_id;
1139 instance_id = -1;
1140 }
1141 }
1142 pstrcat(se->idstr, sizeof(se->idstr), idstr);
1143
1144 if (instance_id == -1) {
1145 se->instance_id = calculate_new_instance_id(se->idstr);
1146 } else {
1147 se->instance_id = instance_id;
1148 }
1149 assert(!se->compat || se->instance_id == 0);
1150 /* add at the end of list */
1151 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1152 return 0;
1153 }
1154
1155 int register_savevm(DeviceState *dev,
1156 const char *idstr,
1157 int instance_id,
1158 int version_id,
1159 SaveStateHandler *save_state,
1160 LoadStateHandler *load_state,
1161 void *opaque)
1162 {
1163 return register_savevm_live(dev, idstr, instance_id, version_id,
1164 NULL, NULL, save_state, load_state, opaque);
1165 }
1166
1167 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1168 {
1169 SaveStateEntry *se, *new_se;
1170 char id[256] = "";
1171
1172 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1173 char *path = dev->parent_bus->info->get_dev_path(dev);
1174 if (path) {
1175 pstrcpy(id, sizeof(id), path);
1176 pstrcat(id, sizeof(id), "/");
1177 qemu_free(path);
1178 }
1179 }
1180 pstrcat(id, sizeof(id), idstr);
1181
1182 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1183 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1184 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1185 if (se->compat) {
1186 qemu_free(se->compat);
1187 }
1188 qemu_free(se);
1189 }
1190 }
1191 }
1192
1193 /* mark a device as not to be migrated, that is the device should be
1194 unplugged before migration */
1195 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1196 void *opaque)
1197 {
1198 SaveStateEntry *se;
1199 char id[256] = "";
1200
1201 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1202 char *path = dev->parent_bus->info->get_dev_path(dev);
1203 if (path) {
1204 pstrcpy(id, sizeof(id), path);
1205 pstrcat(id, sizeof(id), "/");
1206 qemu_free(path);
1207 }
1208 }
1209 pstrcat(id, sizeof(id), idstr);
1210
1211 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1212 if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1213 se->no_migrate = 1;
1214 }
1215 }
1216 }
1217
1218 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1219 const VMStateDescription *vmsd,
1220 void *opaque, int alias_id,
1221 int required_for_version)
1222 {
1223 SaveStateEntry *se;
1224
1225 /* If this triggers, alias support can be dropped for the vmsd. */
1226 assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1227
1228 se = qemu_mallocz(sizeof(SaveStateEntry));
1229 se->version_id = vmsd->version_id;
1230 se->section_id = global_section_id++;
1231 se->save_live_state = NULL;
1232 se->save_state = NULL;
1233 se->load_state = NULL;
1234 se->opaque = opaque;
1235 se->vmsd = vmsd;
1236 se->alias_id = alias_id;
1237
1238 if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1239 char *id = dev->parent_bus->info->get_dev_path(dev);
1240 if (id) {
1241 pstrcpy(se->idstr, sizeof(se->idstr), id);
1242 pstrcat(se->idstr, sizeof(se->idstr), "/");
1243 qemu_free(id);
1244
1245 se->compat = qemu_mallocz(sizeof(CompatEntry));
1246 pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1247 se->compat->instance_id = instance_id == -1 ?
1248 calculate_compat_instance_id(vmsd->name) : instance_id;
1249 instance_id = -1;
1250 }
1251 }
1252 pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1253
1254 if (instance_id == -1) {
1255 se->instance_id = calculate_new_instance_id(se->idstr);
1256 } else {
1257 se->instance_id = instance_id;
1258 }
1259 assert(!se->compat || se->instance_id == 0);
1260 /* add at the end of list */
1261 QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1262 return 0;
1263 }
1264
1265 int vmstate_register(DeviceState *dev, int instance_id,
1266 const VMStateDescription *vmsd, void *opaque)
1267 {
1268 return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1269 opaque, -1, 0);
1270 }
1271
1272 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1273 void *opaque)
1274 {
1275 SaveStateEntry *se, *new_se;
1276
1277 QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1278 if (se->vmsd == vmsd && se->opaque == opaque) {
1279 QTAILQ_REMOVE(&savevm_handlers, se, entry);
1280 if (se->compat) {
1281 qemu_free(se->compat);
1282 }
1283 qemu_free(se);
1284 }
1285 }
1286 }
1287
1288 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1289 void *opaque);
1290 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1291 void *opaque);
1292
1293 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1294 void *opaque, int version_id)
1295 {
1296 VMStateField *field = vmsd->fields;
1297 int ret;
1298
1299 if (version_id > vmsd->version_id) {
1300 return -EINVAL;
1301 }
1302 if (version_id < vmsd->minimum_version_id_old) {
1303 return -EINVAL;
1304 }
1305 if (version_id < vmsd->minimum_version_id) {
1306 return vmsd->load_state_old(f, opaque, version_id);
1307 }
1308 if (vmsd->pre_load) {
1309 int ret = vmsd->pre_load(opaque);
1310 if (ret)
1311 return ret;
1312 }
1313 while(field->name) {
1314 if ((field->field_exists &&
1315 field->field_exists(opaque, version_id)) ||
1316 (!field->field_exists &&
1317 field->version_id <= version_id)) {
1318 void *base_addr = opaque + field->offset;
1319 int i, n_elems = 1;
1320 int size = field->size;
1321
1322 if (field->flags & VMS_VBUFFER) {
1323 size = *(int32_t *)(opaque+field->size_offset);
1324 if (field->flags & VMS_MULTIPLY) {
1325 size *= field->size;
1326 }
1327 }
1328 if (field->flags & VMS_ARRAY) {
1329 n_elems = field->num;
1330 } else if (field->flags & VMS_VARRAY_INT32) {
1331 n_elems = *(int32_t *)(opaque+field->num_offset);
1332 } else if (field->flags & VMS_VARRAY_UINT32) {
1333 n_elems = *(uint32_t *)(opaque+field->num_offset);
1334 } else if (field->flags & VMS_VARRAY_UINT16) {
1335 n_elems = *(uint16_t *)(opaque+field->num_offset);
1336 } else if (field->flags & VMS_VARRAY_UINT8) {
1337 n_elems = *(uint8_t *)(opaque+field->num_offset);
1338 }
1339 if (field->flags & VMS_POINTER) {
1340 base_addr = *(void **)base_addr + field->start;
1341 }
1342 for (i = 0; i < n_elems; i++) {
1343 void *addr = base_addr + size * i;
1344
1345 if (field->flags & VMS_ARRAY_OF_POINTER) {
1346 addr = *(void **)addr;
1347 }
1348 if (field->flags & VMS_STRUCT) {
1349 ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1350 } else {
1351 ret = field->info->get(f, addr, size);
1352
1353 }
1354 if (ret < 0) {
1355 return ret;
1356 }
1357 }
1358 }
1359 field++;
1360 }
1361 ret = vmstate_subsection_load(f, vmsd, opaque);
1362 if (ret != 0) {
1363 return ret;
1364 }
1365 if (vmsd->post_load) {
1366 return vmsd->post_load(opaque, version_id);
1367 }
1368 return 0;
1369 }
1370
1371 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1372 void *opaque)
1373 {
1374 VMStateField *field = vmsd->fields;
1375
1376 if (vmsd->pre_save) {
1377 vmsd->pre_save(opaque);
1378 }
1379 while(field->name) {
1380 if (!field->field_exists ||
1381 field->field_exists(opaque, vmsd->version_id)) {
1382 void *base_addr = opaque + field->offset;
1383 int i, n_elems = 1;
1384 int size = field->size;
1385
1386 if (field->flags & VMS_VBUFFER) {
1387 size = *(int32_t *)(opaque+field->size_offset);
1388 if (field->flags & VMS_MULTIPLY) {
1389 size *= field->size;
1390 }
1391 }
1392 if (field->flags & VMS_ARRAY) {
1393 n_elems = field->num;
1394 } else if (field->flags & VMS_VARRAY_INT32) {
1395 n_elems = *(int32_t *)(opaque+field->num_offset);
1396 } else if (field->flags & VMS_VARRAY_UINT16) {
1397 n_elems = *(uint16_t *)(opaque+field->num_offset);
1398 } else if (field->flags & VMS_VARRAY_UINT8) {
1399 n_elems = *(uint8_t *)(opaque+field->num_offset);
1400 }
1401 if (field->flags & VMS_POINTER) {
1402 base_addr = *(void **)base_addr + field->start;
1403 }
1404 for (i = 0; i < n_elems; i++) {
1405 void *addr = base_addr + size * i;
1406
1407 if (field->flags & VMS_ARRAY_OF_POINTER) {
1408 addr = *(void **)addr;
1409 }
1410 if (field->flags & VMS_STRUCT) {
1411 vmstate_save_state(f, field->vmsd, addr);
1412 } else {
1413 field->info->put(f, addr, size);
1414 }
1415 }
1416 }
1417 field++;
1418 }
1419 vmstate_subsection_save(f, vmsd, opaque);
1420 }
1421
1422 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1423 {
1424 if (!se->vmsd) { /* Old style */
1425 return se->load_state(f, se->opaque, version_id);
1426 }
1427 return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1428 }
1429
1430 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1431 {
1432 if (!se->vmsd) { /* Old style */
1433 se->save_state(f, se->opaque);
1434 return;
1435 }
1436 vmstate_save_state(f,se->vmsd, se->opaque);
1437 }
1438
1439 #define QEMU_VM_FILE_MAGIC 0x5145564d
1440 #define QEMU_VM_FILE_VERSION_COMPAT 0x00000002
1441 #define QEMU_VM_FILE_VERSION 0x00000003
1442
1443 #define QEMU_VM_EOF 0x00
1444 #define QEMU_VM_SECTION_START 0x01
1445 #define QEMU_VM_SECTION_PART 0x02
1446 #define QEMU_VM_SECTION_END 0x03
1447 #define QEMU_VM_SECTION_FULL 0x04
1448 #define QEMU_VM_SUBSECTION 0x05
1449
1450 bool qemu_savevm_state_blocked(Monitor *mon)
1451 {
1452 SaveStateEntry *se;
1453
1454 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1455 if (se->no_migrate) {
1456 monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
1457 se->idstr);
1458 return true;
1459 }
1460 }
1461 return false;
1462 }
1463
1464 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1465 int shared)
1466 {
1467 SaveStateEntry *se;
1468
1469 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1470 if(se->set_params == NULL) {
1471 continue;
1472 }
1473 se->set_params(blk_enable, shared, se->opaque);
1474 }
1475
1476 qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1477 qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1478
1479 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1480 int len;
1481
1482 if (se->save_live_state == NULL)
1483 continue;
1484
1485 /* Section type */
1486 qemu_put_byte(f, QEMU_VM_SECTION_START);
1487 qemu_put_be32(f, se->section_id);
1488
1489 /* ID string */
1490 len = strlen(se->idstr);
1491 qemu_put_byte(f, len);
1492 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1493
1494 qemu_put_be32(f, se->instance_id);
1495 qemu_put_be32(f, se->version_id);
1496
1497 se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1498 }
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_iterate(Monitor *mon, QEMUFile *f)
1509 {
1510 SaveStateEntry *se;
1511 int ret = 1;
1512
1513 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1514 if (se->save_live_state == NULL)
1515 continue;
1516
1517 /* Section type */
1518 qemu_put_byte(f, QEMU_VM_SECTION_PART);
1519 qemu_put_be32(f, se->section_id);
1520
1521 ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1522 if (!ret) {
1523 /* Do not proceed to the next vmstate before this one reported
1524 completion of the current stage. This serializes the migration
1525 and reduces the probability that a faster changing state is
1526 synchronized over and over again. */
1527 break;
1528 }
1529 }
1530
1531 if (ret)
1532 return 1;
1533
1534 if (qemu_file_has_error(f)) {
1535 qemu_savevm_state_cancel(mon, f);
1536 return -EIO;
1537 }
1538
1539 return 0;
1540 }
1541
1542 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1543 {
1544 SaveStateEntry *se;
1545
1546 cpu_synchronize_all_states();
1547
1548 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1549 if (se->save_live_state == NULL)
1550 continue;
1551
1552 /* Section type */
1553 qemu_put_byte(f, QEMU_VM_SECTION_END);
1554 qemu_put_be32(f, se->section_id);
1555
1556 se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1557 }
1558
1559 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1560 int len;
1561
1562 if (se->save_state == NULL && se->vmsd == NULL)
1563 continue;
1564
1565 /* Section type */
1566 qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1567 qemu_put_be32(f, se->section_id);
1568
1569 /* ID string */
1570 len = strlen(se->idstr);
1571 qemu_put_byte(f, len);
1572 qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1573
1574 qemu_put_be32(f, se->instance_id);
1575 qemu_put_be32(f, se->version_id);
1576
1577 vmstate_save(f, se);
1578 }
1579
1580 qemu_put_byte(f, QEMU_VM_EOF);
1581
1582 if (qemu_file_has_error(f))
1583 return -EIO;
1584
1585 return 0;
1586 }
1587
1588 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1589 {
1590 SaveStateEntry *se;
1591
1592 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1593 if (se->save_live_state) {
1594 se->save_live_state(mon, f, -1, se->opaque);
1595 }
1596 }
1597 }
1598
1599 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1600 {
1601 int saved_vm_running;
1602 int ret;
1603
1604 saved_vm_running = vm_running;
1605 vm_stop(VMSTOP_SAVEVM);
1606
1607 if (qemu_savevm_state_blocked(mon)) {
1608 ret = -EINVAL;
1609 goto out;
1610 }
1611
1612 ret = qemu_savevm_state_begin(mon, f, 0, 0);
1613 if (ret < 0)
1614 goto out;
1615
1616 do {
1617 ret = qemu_savevm_state_iterate(mon, f);
1618 if (ret < 0)
1619 goto out;
1620 } while (ret == 0);
1621
1622 ret = qemu_savevm_state_complete(mon, f);
1623
1624 out:
1625 if (qemu_file_has_error(f))
1626 ret = -EIO;
1627
1628 if (!ret && saved_vm_running)
1629 vm_start();
1630
1631 return ret;
1632 }
1633
1634 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1635 {
1636 SaveStateEntry *se;
1637
1638 QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1639 if (!strcmp(se->idstr, idstr) &&
1640 (instance_id == se->instance_id ||
1641 instance_id == se->alias_id))
1642 return se;
1643 /* Migrating from an older version? */
1644 if (strstr(se->idstr, idstr) && se->compat) {
1645 if (!strcmp(se->compat->idstr, idstr) &&
1646 (instance_id == se->compat->instance_id ||
1647 instance_id == se->alias_id))
1648 return se;
1649 }
1650 }
1651 return NULL;
1652 }
1653
1654 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1655 {
1656 while(sub && sub->needed) {
1657 if (strcmp(idstr, sub->vmsd->name) == 0) {
1658 return sub->vmsd;
1659 }
1660 sub++;
1661 }
1662 return NULL;
1663 }
1664
1665 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1666 void *opaque)
1667 {
1668 const VMStateSubsection *sub = vmsd->subsections;
1669
1670 if (!sub || !sub->needed) {
1671 return 0;
1672 }
1673
1674 while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
1675 char idstr[256];
1676 int ret;
1677 uint8_t version_id, len;
1678 const VMStateDescription *sub_vmsd;
1679
1680 qemu_get_byte(f); /* subsection */
1681 len = qemu_get_byte(f);
1682 qemu_get_buffer(f, (uint8_t *)idstr, len);
1683 idstr[len] = 0;
1684 version_id = qemu_get_be32(f);
1685
1686 sub_vmsd = vmstate_get_subsection(sub, idstr);
1687 if (sub_vmsd == NULL) {
1688 return -ENOENT;
1689 }
1690 assert(!sub_vmsd->subsections);
1691 ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1692 if (ret) {
1693 return ret;
1694 }
1695 }
1696 return 0;
1697 }
1698
1699 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1700 void *opaque)
1701 {
1702 const VMStateSubsection *sub = vmsd->subsections;
1703
1704 while (sub && sub->needed) {
1705 if (sub->needed(opaque)) {
1706 const VMStateDescription *vmsd = sub->vmsd;
1707 uint8_t len;
1708
1709 qemu_put_byte(f, QEMU_VM_SUBSECTION);
1710 len = strlen(vmsd->name);
1711 qemu_put_byte(f, len);
1712 qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1713 qemu_put_be32(f, vmsd->version_id);
1714 assert(!vmsd->subsections);
1715 vmstate_save_state(f, vmsd, opaque);
1716 }
1717 sub++;
1718 }
1719 }
1720
1721 typedef struct LoadStateEntry {
1722 QLIST_ENTRY(LoadStateEntry) entry;
1723 SaveStateEntry *se;
1724 int section_id;
1725 int version_id;
1726 } LoadStateEntry;
1727
1728 int qemu_loadvm_state(QEMUFile *f)
1729 {
1730 QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1731 QLIST_HEAD_INITIALIZER(loadvm_handlers);
1732 LoadStateEntry *le, *new_le;
1733 uint8_t section_type;
1734 unsigned int v;
1735 int ret;
1736
1737 if (qemu_savevm_state_blocked(default_mon)) {
1738 return -EINVAL;
1739 }
1740
1741 v = qemu_get_be32(f);
1742 if (v != QEMU_VM_FILE_MAGIC)
1743 return -EINVAL;
1744
1745 v = qemu_get_be32(f);
1746 if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1747 fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1748 return -ENOTSUP;
1749 }
1750 if (v != QEMU_VM_FILE_VERSION)
1751 return -ENOTSUP;
1752
1753 while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1754 uint32_t instance_id, version_id, section_id;
1755 SaveStateEntry *se;
1756 char idstr[257];
1757 int len;
1758
1759 switch (section_type) {
1760 case QEMU_VM_SECTION_START:
1761 case QEMU_VM_SECTION_FULL:
1762 /* Read section start */
1763 section_id = qemu_get_be32(f);
1764 len = qemu_get_byte(f);
1765 qemu_get_buffer(f, (uint8_t *)idstr, len);
1766 idstr[len] = 0;
1767 instance_id = qemu_get_be32(f);
1768 version_id = qemu_get_be32(f);
1769
1770 /* Find savevm section */
1771 se = find_se(idstr, instance_id);
1772 if (se == NULL) {
1773 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1774 ret = -EINVAL;
1775 goto out;
1776 }
1777
1778 /* Validate version */
1779 if (version_id > se->version_id) {
1780 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1781 version_id, idstr, se->version_id);
1782 ret = -EINVAL;
1783 goto out;
1784 }
1785
1786 /* Add entry */
1787 le = qemu_mallocz(sizeof(*le));
1788
1789 le->se = se;
1790 le->section_id = section_id;
1791 le->version_id = version_id;
1792 QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1793
1794 ret = vmstate_load(f, le->se, le->version_id);
1795 if (ret < 0) {
1796 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1797 instance_id, idstr);
1798 goto out;
1799 }
1800 break;
1801 case QEMU_VM_SECTION_PART:
1802 case QEMU_VM_SECTION_END:
1803 section_id = qemu_get_be32(f);
1804
1805 QLIST_FOREACH(le, &loadvm_handlers, entry) {
1806 if (le->section_id == section_id) {
1807 break;
1808 }
1809 }
1810 if (le == NULL) {
1811 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1812 ret = -EINVAL;
1813 goto out;
1814 }
1815
1816 ret = vmstate_load(f, le->se, le->version_id);
1817 if (ret < 0) {
1818 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1819 section_id);
1820 goto out;
1821 }
1822 break;
1823 default:
1824 fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1825 ret = -EINVAL;
1826 goto out;
1827 }
1828 }
1829
1830 cpu_synchronize_all_post_init();
1831
1832 ret = 0;
1833
1834 out:
1835 QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1836 QLIST_REMOVE(le, entry);
1837 qemu_free(le);
1838 }
1839
1840 if (qemu_file_has_error(f))
1841 ret = -EIO;
1842
1843 return ret;
1844 }
1845
1846 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1847 const char *name)
1848 {
1849 QEMUSnapshotInfo *sn_tab, *sn;
1850 int nb_sns, i, ret;
1851
1852 ret = -ENOENT;
1853 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1854 if (nb_sns < 0)
1855 return ret;
1856 for(i = 0; i < nb_sns; i++) {
1857 sn = &sn_tab[i];
1858 if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1859 *sn_info = *sn;
1860 ret = 0;
1861 break;
1862 }
1863 }
1864 qemu_free(sn_tab);
1865 return ret;
1866 }
1867
1868 /*
1869 * Deletes snapshots of a given name in all opened images.
1870 */
1871 static int del_existing_snapshots(Monitor *mon, const char *name)
1872 {
1873 BlockDriverState *bs;
1874 QEMUSnapshotInfo sn1, *snapshot = &sn1;
1875 int ret;
1876
1877 bs = NULL;
1878 while ((bs = bdrv_next(bs))) {
1879 if (bdrv_can_snapshot(bs) &&
1880 bdrv_snapshot_find(bs, snapshot, name) >= 0)
1881 {
1882 ret = bdrv_snapshot_delete(bs, name);
1883 if (ret < 0) {
1884 monitor_printf(mon,
1885 "Error while deleting snapshot on '%s'\n",
1886 bdrv_get_device_name(bs));
1887 return -1;
1888 }
1889 }
1890 }
1891
1892 return 0;
1893 }
1894
1895 void do_savevm(Monitor *mon, const QDict *qdict)
1896 {
1897 BlockDriverState *bs, *bs1;
1898 QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1899 int ret;
1900 QEMUFile *f;
1901 int saved_vm_running;
1902 uint32_t vm_state_size;
1903 #ifdef _WIN32
1904 struct _timeb tb;
1905 struct tm *ptm;
1906 #else
1907 struct timeval tv;
1908 struct tm tm;
1909 #endif
1910 const char *name = qdict_get_try_str(qdict, "name");
1911
1912 /* Verify if there is a device that doesn't support snapshots and is writable */
1913 bs = NULL;
1914 while ((bs = bdrv_next(bs))) {
1915
1916 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1917 continue;
1918 }
1919
1920 if (!bdrv_can_snapshot(bs)) {
1921 monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1922 bdrv_get_device_name(bs));
1923 return;
1924 }
1925 }
1926
1927 bs = bdrv_snapshots();
1928 if (!bs) {
1929 monitor_printf(mon, "No block device can accept snapshots\n");
1930 return;
1931 }
1932
1933 saved_vm_running = vm_running;
1934 vm_stop(VMSTOP_SAVEVM);
1935
1936 memset(sn, 0, sizeof(*sn));
1937
1938 /* fill auxiliary fields */
1939 #ifdef _WIN32
1940 _ftime(&tb);
1941 sn->date_sec = tb.time;
1942 sn->date_nsec = tb.millitm * 1000000;
1943 #else
1944 gettimeofday(&tv, NULL);
1945 sn->date_sec = tv.tv_sec;
1946 sn->date_nsec = tv.tv_usec * 1000;
1947 #endif
1948 sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
1949
1950 if (name) {
1951 ret = bdrv_snapshot_find(bs, old_sn, name);
1952 if (ret >= 0) {
1953 pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1954 pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1955 } else {
1956 pstrcpy(sn->name, sizeof(sn->name), name);
1957 }
1958 } else {
1959 #ifdef _WIN32
1960 ptm = localtime(&tb.time);
1961 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
1962 #else
1963 /* cast below needed for OpenBSD where tv_sec is still 'long' */
1964 localtime_r((const time_t *)&tv.tv_sec, &tm);
1965 strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
1966 #endif
1967 }
1968
1969 /* Delete old snapshots of the same name */
1970 if (name && del_existing_snapshots(mon, name) < 0) {
1971 goto the_end;
1972 }
1973
1974 /* save the VM state */
1975 f = qemu_fopen_bdrv(bs, 1);
1976 if (!f) {
1977 monitor_printf(mon, "Could not open VM state file\n");
1978 goto the_end;
1979 }
1980 ret = qemu_savevm_state(mon, f);
1981 vm_state_size = qemu_ftell(f);
1982 qemu_fclose(f);
1983 if (ret < 0) {
1984 monitor_printf(mon, "Error %d while writing VM\n", ret);
1985 goto the_end;
1986 }
1987
1988 /* create the snapshots */
1989
1990 bs1 = NULL;
1991 while ((bs1 = bdrv_next(bs1))) {
1992 if (bdrv_can_snapshot(bs1)) {
1993 /* Write VM state size only to the image that contains the state */
1994 sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1995 ret = bdrv_snapshot_create(bs1, sn);
1996 if (ret < 0) {
1997 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1998 bdrv_get_device_name(bs1));
1999 }
2000 }
2001 }
2002
2003 the_end:
2004 if (saved_vm_running)
2005 vm_start();
2006 }
2007
2008 int load_vmstate(const char *name)
2009 {
2010 BlockDriverState *bs, *bs_vm_state;
2011 QEMUSnapshotInfo sn;
2012 QEMUFile *f;
2013 int ret;
2014
2015 bs_vm_state = bdrv_snapshots();
2016 if (!bs_vm_state) {
2017 error_report("No block device supports snapshots");
2018 return -ENOTSUP;
2019 }
2020
2021 /* Don't even try to load empty VM states */
2022 ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2023 if (ret < 0) {
2024 return ret;
2025 } else if (sn.vm_state_size == 0) {
2026 error_report("This is a disk-only snapshot. Revert to it offline "
2027 "using qemu-img.");
2028 return -EINVAL;
2029 }
2030
2031 /* Verify if there is any device that doesn't support snapshots and is
2032 writable and check if the requested snapshot is available too. */
2033 bs = NULL;
2034 while ((bs = bdrv_next(bs))) {
2035
2036 if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
2037 continue;
2038 }
2039
2040 if (!bdrv_can_snapshot(bs)) {
2041 error_report("Device '%s' is writable but does not support snapshots.",
2042 bdrv_get_device_name(bs));
2043 return -ENOTSUP;
2044 }
2045
2046 ret = bdrv_snapshot_find(bs, &sn, name);
2047 if (ret < 0) {
2048 error_report("Device '%s' does not have the requested snapshot '%s'",
2049 bdrv_get_device_name(bs), name);
2050 return ret;
2051 }
2052 }
2053
2054 /* Flush all IO requests so they don't interfere with the new state. */
2055 qemu_aio_flush();
2056
2057 bs = NULL;
2058 while ((bs = bdrv_next(bs))) {
2059 if (bdrv_can_snapshot(bs)) {
2060 ret = bdrv_snapshot_goto(bs, name);
2061 if (ret < 0) {
2062 error_report("Error %d while activating snapshot '%s' on '%s'",
2063 ret, name, bdrv_get_device_name(bs));
2064 return ret;
2065 }
2066 }
2067 }
2068
2069 /* restore the VM state */
2070 f = qemu_fopen_bdrv(bs_vm_state, 0);
2071 if (!f) {
2072 error_report("Could not open VM state file");
2073 return -EINVAL;
2074 }
2075
2076 ret = qemu_loadvm_state(f);
2077
2078 qemu_fclose(f);
2079 if (ret < 0) {
2080 error_report("Error %d while loading VM state", ret);
2081 return ret;
2082 }
2083
2084 return 0;
2085 }
2086
2087 void do_delvm(Monitor *mon, const QDict *qdict)
2088 {
2089 BlockDriverState *bs, *bs1;
2090 int ret;
2091 const char *name = qdict_get_str(qdict, "name");
2092
2093 bs = bdrv_snapshots();
2094 if (!bs) {
2095 monitor_printf(mon, "No block device supports snapshots\n");
2096 return;
2097 }
2098
2099 bs1 = NULL;
2100 while ((bs1 = bdrv_next(bs1))) {
2101 if (bdrv_can_snapshot(bs1)) {
2102 ret = bdrv_snapshot_delete(bs1, name);
2103 if (ret < 0) {
2104 if (ret == -ENOTSUP)
2105 monitor_printf(mon,
2106 "Snapshots not supported on device '%s'\n",
2107 bdrv_get_device_name(bs1));
2108 else
2109 monitor_printf(mon, "Error %d while deleting snapshot on "
2110 "'%s'\n", ret, bdrv_get_device_name(bs1));
2111 }
2112 }
2113 }
2114 }
2115
2116 void do_info_snapshots(Monitor *mon)
2117 {
2118 BlockDriverState *bs, *bs1;
2119 QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2120 int nb_sns, i, ret, available;
2121 int total;
2122 int *available_snapshots;
2123 char buf[256];
2124
2125 bs = bdrv_snapshots();
2126 if (!bs) {
2127 monitor_printf(mon, "No available block device supports snapshots\n");
2128 return;
2129 }
2130
2131 nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2132 if (nb_sns < 0) {
2133 monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2134 return;
2135 }
2136
2137 if (nb_sns == 0) {
2138 monitor_printf(mon, "There is no snapshot available.\n");
2139 return;
2140 }
2141
2142 available_snapshots = qemu_mallocz(sizeof(int) * nb_sns);
2143 total = 0;
2144 for (i = 0; i < nb_sns; i++) {
2145 sn = &sn_tab[i];
2146 available = 1;
2147 bs1 = NULL;
2148
2149 while ((bs1 = bdrv_next(bs1))) {
2150 if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2151 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2152 if (ret < 0) {
2153 available = 0;
2154 break;
2155 }
2156 }
2157 }
2158
2159 if (available) {
2160 available_snapshots[total] = i;
2161 total++;
2162 }
2163 }
2164
2165 if (total > 0) {
2166 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2167 for (i = 0; i < total; i++) {
2168 sn = &sn_tab[available_snapshots[i]];
2169 monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2170 }
2171 } else {
2172 monitor_printf(mon, "There is no suitable snapshot available\n");
2173 }
2174
2175 qemu_free(sn_tab);
2176 qemu_free(available_snapshots);
2177
2178 }
Zhi Yong Wu's QEmu Source Tree - dev