savevm.c

   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 "qemu-timer.h"
  85 #include "cpus.h"
  86
  87 #define SELF_ANNOUNCE_ROUNDS 5
  88
  89 #ifndef ETH_P_RARP
  90 #define ETH_P_RARP 0x8035
  91 #endif
  92 #define ARP_HTYPE_ETH 0x0001
  93 #define ARP_PTYPE_IP 0x0800
  94 #define ARP_OP_REQUEST_REV 0x3
  95
  96 static int announce_self_create(uint8_t *buf,
  97                                 uint8_t *mac_addr)
  98 {
  99     /* Ethernet header. */
 100     memset(buf, 0xff, 6);         /* destination MAC addr */
 101     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 102     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 103
 104     /* RARP header. */
 105     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 106     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 107     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 108     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 109     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 110     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 111     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 112     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 113     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 114
 115     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 116     memset(buf + 42, 0x00, 18);
 117
 118     return 60; /* len (FCS will be added by hardware) */
 119 }
 120
 121 static void qemu_announce_self_iter(NICState *nic, void *opaque)
 122 {
 123     uint8_t buf[60];
 124     int len;
 125
 126     len = announce_self_create(buf, nic->conf->macaddr.a);
 127
 128     qemu_send_packet_raw(&nic->nc, buf, len);
 129 }
 130
 131
 132 static void qemu_announce_self_once(void *opaque)
 133 {
 134     static int count = SELF_ANNOUNCE_ROUNDS;
 135     QEMUTimer *timer = *(QEMUTimer **)opaque;
 136
 137     qemu_foreach_nic(qemu_announce_self_iter, NULL);
 138
 139     if (--count) {
 140         /* delay 50ms, 150ms, 250ms, ... */
 141         qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
 142                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 143     } else {
 144             qemu_del_timer(timer);
 145             qemu_free_timer(timer);
 146     }
 147 }
 148
 149 void qemu_announce_self(void)
 150 {
 151         static QEMUTimer *timer;
 152         timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
 153         qemu_announce_self_once(&timer);
 154 }
 155
 156 /***********************************************************/
 157 /* savevm/loadvm support */
 158
 159 #define IO_BUF_SIZE 32768
 160
 161 struct QEMUFile {
 162     QEMUFilePutBufferFunc *put_buffer;
 163     QEMUFileGetBufferFunc *get_buffer;
 164     QEMUFileCloseFunc *close;
 165     QEMUFileRateLimit *rate_limit;
 166     QEMUFileSetRateLimit *set_rate_limit;
 167     QEMUFileGetRateLimit *get_rate_limit;
 168     void *opaque;
 169     int is_write;
 170
 171     int64_t buf_offset; /* start of buffer when writing, end of buffer
 172                            when reading */
 173     int buf_index;
 174     int buf_size; /* 0 when writing */
 175     uint8_t buf[IO_BUF_SIZE];
 176
 177     int last_error;
 178 };
 179
 180 typedef struct QEMUFileStdio
 181 {
 182     FILE *stdio_file;
 183     QEMUFile *file;
 184 } QEMUFileStdio;
 185
 186 typedef struct QEMUFileSocket
 187 {
 188     int fd;
 189     QEMUFile *file;
 190 } QEMUFileSocket;
 191
 192 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 193 {
 194     QEMUFileSocket *s = opaque;
 195     ssize_t len;
 196
 197     do {
 198         len = qemu_recv(s->fd, buf, size, 0);
 199     } while (len == -1 && socket_error() == EINTR);
 200
 201     if (len == -1)
 202         len = -socket_error();
 203
 204     return len;
 205 }
 206
 207 static int socket_close(void *opaque)
 208 {
 209     QEMUFileSocket *s = opaque;
 210     g_free(s);
 211     return 0;
 212 }
 213
 214 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 215 {
 216     QEMUFileStdio *s = opaque;
 217     return fwrite(buf, 1, size, s->stdio_file);
 218 }
 219
 220 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 221 {
 222     QEMUFileStdio *s = opaque;
 223     FILE *fp = s->stdio_file;
 224     int bytes;
 225
 226     do {
 227         clearerr(fp);
 228         bytes = fread(buf, 1, size, fp);
 229     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 230     return bytes;
 231 }
 232
 233 static int stdio_pclose(void *opaque)
 234 {
 235     QEMUFileStdio *s = opaque;
 236     int ret;
 237     ret = pclose(s->stdio_file);
 238     g_free(s);
 239     return ret;
 240 }
 241
 242 static int stdio_fclose(void *opaque)
 243 {
 244     QEMUFileStdio *s = opaque;
 245     fclose(s->stdio_file);
 246     g_free(s);
 247     return 0;
 248 }
 249
 250 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 251 {
 252     QEMUFileStdio *s;
 253
 254     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 255         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 256         return NULL;
 257     }
 258
 259     s = g_malloc0(sizeof(QEMUFileStdio));
 260
 261     s->stdio_file = stdio_file;
 262
 263     if(mode[0] == 'r') {
 264         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 265                                  NULL, NULL, NULL);
 266     } else {
 267         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 268                                  NULL, NULL, NULL);
 269     }
 270     return s->file;
 271 }
 272
 273 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 274 {
 275     FILE *popen_file;
 276
 277     popen_file = popen(command, mode);
 278     if(popen_file == NULL) {
 279         return NULL;
 280     }
 281
 282     return qemu_popen(popen_file, mode);
 283 }
 284
 285 int qemu_stdio_fd(QEMUFile *f)
 286 {
 287     QEMUFileStdio *p;
 288     int fd;
 289
 290     p = (QEMUFileStdio *)f->opaque;
 291     fd = fileno(p->stdio_file);
 292
 293     return fd;
 294 }
 295
 296 QEMUFile *qemu_fdopen(int fd, const char *mode)
 297 {
 298     QEMUFileStdio *s;
 299
 300     if (mode == NULL ||
 301         (mode[0] != 'r' && mode[0] != 'w') ||
 302         mode[1] != 'b' || mode[2] != 0) {
 303         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 304         return NULL;
 305     }
 306
 307     s = g_malloc0(sizeof(QEMUFileStdio));
 308     s->stdio_file = fdopen(fd, mode);
 309     if (!s->stdio_file)
 310         goto fail;
 311
 312     if(mode[0] == 'r') {
 313         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 314                                  NULL, NULL, NULL);
 315     } else {
 316         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 317                                  NULL, NULL, NULL);
 318     }
 319     return s->file;
 320
 321 fail:
 322     g_free(s);
 323     return NULL;
 324 }
 325
 326 QEMUFile *qemu_fopen_socket(int fd)
 327 {
 328     QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
 329
 330     s->fd = fd;
 331     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 332                              NULL, NULL, NULL);
 333     return s->file;
 334 }
 335
 336 static int file_put_buffer(void *opaque, const uint8_t *buf,
 337                             int64_t pos, int size)
 338 {
 339     QEMUFileStdio *s = opaque;
 340     fseek(s->stdio_file, pos, SEEK_SET);
 341     return fwrite(buf, 1, size, s->stdio_file);
 342 }
 343
 344 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 345 {
 346     QEMUFileStdio *s = opaque;
 347     fseek(s->stdio_file, pos, SEEK_SET);
 348     return fread(buf, 1, size, s->stdio_file);
 349 }
 350
 351 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 352 {
 353     QEMUFileStdio *s;
 354
 355     if (mode == NULL ||
 356         (mode[0] != 'r' && mode[0] != 'w') ||
 357         mode[1] != 'b' || mode[2] != 0) {
 358         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
 359         return NULL;
 360     }
 361
 362     s = g_malloc0(sizeof(QEMUFileStdio));
 363
 364     s->stdio_file = fopen(filename, mode);
 365     if (!s->stdio_file)
 366         goto fail;
 367
 368     if(mode[0] == 'w') {
 369         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 370                                  NULL, NULL, NULL);
 371     } else {
 372         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 373                                NULL, NULL, NULL);
 374     }
 375     return s->file;
 376 fail:
 377     g_free(s);
 378     return NULL;
 379 }
 380
 381 static int block_put_buffer(void *opaque, const uint8_t *buf,
 382                            int64_t pos, int size)
 383 {
 384     bdrv_save_vmstate(opaque, buf, pos, size);
 385     return size;
 386 }
 387
 388 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 389 {
 390     return bdrv_load_vmstate(opaque, buf, pos, size);
 391 }
 392
 393 static int bdrv_fclose(void *opaque)
 394 {
 395     return 0;
 396 }
 397
 398 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 399 {
 400     if (is_writable)
 401         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 402                               NULL, NULL, NULL);
 403     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 404 }
 405
 406 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 407                          QEMUFileGetBufferFunc *get_buffer,
 408                          QEMUFileCloseFunc *close,
 409                          QEMUFileRateLimit *rate_limit,
 410                          QEMUFileSetRateLimit *set_rate_limit,
 411                          QEMUFileGetRateLimit *get_rate_limit)
 412 {
 413     QEMUFile *f;
 414
 415     f = g_malloc0(sizeof(QEMUFile));
 416
 417     f->opaque = opaque;
 418     f->put_buffer = put_buffer;
 419     f->get_buffer = get_buffer;
 420     f->close = close;
 421     f->rate_limit = rate_limit;
 422     f->set_rate_limit = set_rate_limit;
 423     f->get_rate_limit = get_rate_limit;
 424     f->is_write = 0;
 425
 426     return f;
 427 }
 428
 429 int qemu_file_get_error(QEMUFile *f)
 430 {
 431     return f->last_error;
 432 }
 433
 434 void qemu_file_set_error(QEMUFile *f, int ret)
 435 {
 436     f->last_error = ret;
 437 }
 438
 439 void qemu_fflush(QEMUFile *f)
 440 {
 441     if (!f->put_buffer)
 442         return;
 443
 444     if (f->is_write && f->buf_index > 0) {
 445         int len;
 446
 447         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 448         if (len > 0)
 449             f->buf_offset += f->buf_index;
 450         else
 451             f->last_error = -EINVAL;
 452         f->buf_index = 0;
 453     }
 454 }
 455
 456 static void qemu_fill_buffer(QEMUFile *f)
 457 {
 458     int len;
 459     int pending;
 460
 461     if (!f->get_buffer)
 462         return;
 463
 464     if (f->is_write)
 465         abort();
 466
 467     pending = f->buf_size - f->buf_index;
 468     if (pending > 0) {
 469         memmove(f->buf, f->buf + f->buf_index, pending);
 470     }
 471     f->buf_index = 0;
 472     f->buf_size = pending;
 473
 474     len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
 475                         IO_BUF_SIZE - pending);
 476     if (len > 0) {
 477         f->buf_size += len;
 478         f->buf_offset += len;
 479     } else if (len != -EAGAIN)
 480         f->last_error = len;
 481 }
 482
 483 int qemu_fclose(QEMUFile *f)
 484 {
 485     int ret = 0;
 486     qemu_fflush(f);
 487     if (f->close)
 488         ret = f->close(f->opaque);
 489     g_free(f);
 490     return ret;
 491 }
 492
 493 void qemu_file_put_notify(QEMUFile *f)
 494 {
 495     f->put_buffer(f->opaque, NULL, 0, 0);
 496 }
 497
 498 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 499 {
 500     int l;
 501
 502     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 503         fprintf(stderr,
 504                 "Attempted to write to buffer while read buffer is not empty\n");
 505         abort();
 506     }
 507
 508     while (!f->last_error && size > 0) {
 509         l = IO_BUF_SIZE - f->buf_index;
 510         if (l > size)
 511             l = size;
 512         memcpy(f->buf + f->buf_index, buf, l);
 513         f->is_write = 1;
 514         f->buf_index += l;
 515         buf += l;
 516         size -= l;
 517         if (f->buf_index >= IO_BUF_SIZE)
 518             qemu_fflush(f);
 519     }
 520 }
 521
 522 void qemu_put_byte(QEMUFile *f, int v)
 523 {
 524     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 525         fprintf(stderr,
 526                 "Attempted to write to buffer while read buffer is not empty\n");
 527         abort();
 528     }
 529
 530     f->buf[f->buf_index++] = v;
 531     f->is_write = 1;
 532     if (f->buf_index >= IO_BUF_SIZE)
 533         qemu_fflush(f);
 534 }
 535
 536 static void qemu_file_skip(QEMUFile *f, int size)
 537 {
 538     if (f->buf_index + size <= f->buf_size) {
 539         f->buf_index += size;
 540     }
 541 }
 542
 543 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
 544 {
 545     int pending;
 546     int index;
 547
 548     if (f->is_write) {
 549         abort();
 550     }
 551
 552     index = f->buf_index + offset;
 553     pending = f->buf_size - index;
 554     if (pending < size) {
 555         qemu_fill_buffer(f);
 556         index = f->buf_index + offset;
 557         pending = f->buf_size - index;
 558     }
 559
 560     if (pending <= 0) {
 561         return 0;
 562     }
 563     if (size > pending) {
 564         size = pending;
 565     }
 566
 567     memcpy(buf, f->buf + index, size);
 568     return size;
 569 }
 570
 571 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
 572 {
 573     int pending = size;
 574     int done = 0;
 575
 576     while (pending > 0) {
 577         int res;
 578
 579         res = qemu_peek_buffer(f, buf, pending, 0);
 580         if (res == 0) {
 581             return done;
 582         }
 583         qemu_file_skip(f, res);
 584         buf += res;
 585         pending -= res;
 586         done += res;
 587     }
 588     return done;
 589 }
 590
 591 static int qemu_peek_byte(QEMUFile *f, int offset)
 592 {
 593     int index = f->buf_index + offset;
 594
 595     if (f->is_write) {
 596         abort();
 597     }
 598
 599     if (index >= f->buf_size) {
 600         qemu_fill_buffer(f);
 601         index = f->buf_index + offset;
 602         if (index >= f->buf_size) {
 603             return 0;
 604         }
 605     }
 606     return f->buf[index];
 607 }
 608
 609 int qemu_get_byte(QEMUFile *f)
 610 {
 611     int result;
 612
 613     result = qemu_peek_byte(f, 0);
 614     qemu_file_skip(f, 1);
 615     return result;
 616 }
 617
 618 int64_t qemu_ftell(QEMUFile *f)
 619 {
 620     return f->buf_offset - f->buf_size + f->buf_index;
 621 }
 622
 623 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 624 {
 625     if (whence == SEEK_SET) {
 626         /* nothing to do */
 627     } else if (whence == SEEK_CUR) {
 628         pos += qemu_ftell(f);
 629     } else {
 630         /* SEEK_END not supported */
 631         return -1;
 632     }
 633     if (f->put_buffer) {
 634         qemu_fflush(f);
 635         f->buf_offset = pos;
 636     } else {
 637         f->buf_offset = pos;
 638         f->buf_index = 0;
 639         f->buf_size = 0;
 640     }
 641     return pos;
 642 }
 643
 644 int qemu_file_rate_limit(QEMUFile *f)
 645 {
 646     if (f->rate_limit)
 647         return f->rate_limit(f->opaque);
 648
 649     return 0;
 650 }
 651
 652 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 653 {
 654     if (f->get_rate_limit)
 655         return f->get_rate_limit(f->opaque);
 656
 657     return 0;
 658 }
 659
 660 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
 661 {
 662     /* any failed or completed migration keeps its state to allow probing of
 663      * migration data, but has no associated file anymore */
 664     if (f && f->set_rate_limit)
 665         return f->set_rate_limit(f->opaque, new_rate);
 666
 667     return 0;
 668 }
 669
 670 void qemu_put_be16(QEMUFile *f, unsigned int v)
 671 {
 672     qemu_put_byte(f, v >> 8);
 673     qemu_put_byte(f, v);
 674 }
 675
 676 void qemu_put_be32(QEMUFile *f, unsigned int v)
 677 {
 678     qemu_put_byte(f, v >> 24);
 679     qemu_put_byte(f, v >> 16);
 680     qemu_put_byte(f, v >> 8);
 681     qemu_put_byte(f, v);
 682 }
 683
 684 void qemu_put_be64(QEMUFile *f, uint64_t v)
 685 {
 686     qemu_put_be32(f, v >> 32);
 687     qemu_put_be32(f, v);
 688 }
 689
 690 unsigned int qemu_get_be16(QEMUFile *f)
 691 {
 692     unsigned int v;
 693     v = qemu_get_byte(f) << 8;
 694     v |= qemu_get_byte(f);
 695     return v;
 696 }
 697
 698 unsigned int qemu_get_be32(QEMUFile *f)
 699 {
 700     unsigned int v;
 701     v = qemu_get_byte(f) << 24;
 702     v |= qemu_get_byte(f) << 16;
 703     v |= qemu_get_byte(f) << 8;
 704     v |= qemu_get_byte(f);
 705     return v;
 706 }
 707
 708 uint64_t qemu_get_be64(QEMUFile *f)
 709 {
 710     uint64_t v;
 711     v = (uint64_t)qemu_get_be32(f) << 32;
 712     v |= qemu_get_be32(f);
 713     return v;
 714 }
 715
 716
 717 /* timer */
 718
 719 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
 720 {
 721     uint64_t expire_time;
 722
 723     expire_time = qemu_timer_expire_time_ns(ts);
 724     qemu_put_be64(f, expire_time);
 725 }
 726
 727 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
 728 {
 729     uint64_t expire_time;
 730
 731     expire_time = qemu_get_be64(f);
 732     if (expire_time != -1) {
 733         qemu_mod_timer_ns(ts, expire_time);
 734     } else {
 735         qemu_del_timer(ts);
 736     }
 737 }
 738
 739
 740 /* bool */
 741
 742 static int get_bool(QEMUFile *f, void *pv, size_t size)
 743 {
 744     bool *v = pv;
 745     *v = qemu_get_byte(f);
 746     return 0;
 747 }
 748
 749 static void put_bool(QEMUFile *f, void *pv, size_t size)
 750 {
 751     bool *v = pv;
 752     qemu_put_byte(f, *v);
 753 }
 754
 755 const VMStateInfo vmstate_info_bool = {
 756     .name = "bool",
 757     .get  = get_bool,
 758     .put  = put_bool,
 759 };
 760
 761 /* 8 bit int */
 762
 763 static int get_int8(QEMUFile *f, void *pv, size_t size)
 764 {
 765     int8_t *v = pv;
 766     qemu_get_s8s(f, v);
 767     return 0;
 768 }
 769
 770 static void put_int8(QEMUFile *f, void *pv, size_t size)
 771 {
 772     int8_t *v = pv;
 773     qemu_put_s8s(f, v);
 774 }
 775
 776 const VMStateInfo vmstate_info_int8 = {
 777     .name = "int8",
 778     .get  = get_int8,
 779     .put  = put_int8,
 780 };
 781
 782 /* 16 bit int */
 783
 784 static int get_int16(QEMUFile *f, void *pv, size_t size)
 785 {
 786     int16_t *v = pv;
 787     qemu_get_sbe16s(f, v);
 788     return 0;
 789 }
 790
 791 static void put_int16(QEMUFile *f, void *pv, size_t size)
 792 {
 793     int16_t *v = pv;
 794     qemu_put_sbe16s(f, v);
 795 }
 796
 797 const VMStateInfo vmstate_info_int16 = {
 798     .name = "int16",
 799     .get  = get_int16,
 800     .put  = put_int16,
 801 };
 802
 803 /* 32 bit int */
 804
 805 static int get_int32(QEMUFile *f, void *pv, size_t size)
 806 {
 807     int32_t *v = pv;
 808     qemu_get_sbe32s(f, v);
 809     return 0;
 810 }
 811
 812 static void put_int32(QEMUFile *f, void *pv, size_t size)
 813 {
 814     int32_t *v = pv;
 815     qemu_put_sbe32s(f, v);
 816 }
 817
 818 const VMStateInfo vmstate_info_int32 = {
 819     .name = "int32",
 820     .get  = get_int32,
 821     .put  = put_int32,
 822 };
 823
 824 /* 32 bit int. See that the received value is the same than the one
 825    in the field */
 826
 827 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 828 {
 829     int32_t *v = pv;
 830     int32_t v2;
 831     qemu_get_sbe32s(f, &v2);
 832
 833     if (*v == v2)
 834         return 0;
 835     return -EINVAL;
 836 }
 837
 838 const VMStateInfo vmstate_info_int32_equal = {
 839     .name = "int32 equal",
 840     .get  = get_int32_equal,
 841     .put  = put_int32,
 842 };
 843
 844 /* 32 bit int. See that the received value is the less or the same
 845    than the one in the field */
 846
 847 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 848 {
 849     int32_t *old = pv;
 850     int32_t new;
 851     qemu_get_sbe32s(f, &new);
 852
 853     if (*old <= new)
 854         return 0;
 855     return -EINVAL;
 856 }
 857
 858 const VMStateInfo vmstate_info_int32_le = {
 859     .name = "int32 equal",
 860     .get  = get_int32_le,
 861     .put  = put_int32,
 862 };
 863
 864 /* 64 bit int */
 865
 866 static int get_int64(QEMUFile *f, void *pv, size_t size)
 867 {
 868     int64_t *v = pv;
 869     qemu_get_sbe64s(f, v);
 870     return 0;
 871 }
 872
 873 static void put_int64(QEMUFile *f, void *pv, size_t size)
 874 {
 875     int64_t *v = pv;
 876     qemu_put_sbe64s(f, v);
 877 }
 878
 879 const VMStateInfo vmstate_info_int64 = {
 880     .name = "int64",
 881     .get  = get_int64,
 882     .put  = put_int64,
 883 };
 884
 885 /* 8 bit unsigned int */
 886
 887 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 888 {
 889     uint8_t *v = pv;
 890     qemu_get_8s(f, v);
 891     return 0;
 892 }
 893
 894 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 895 {
 896     uint8_t *v = pv;
 897     qemu_put_8s(f, v);
 898 }
 899
 900 const VMStateInfo vmstate_info_uint8 = {
 901     .name = "uint8",
 902     .get  = get_uint8,
 903     .put  = put_uint8,
 904 };
 905
 906 /* 16 bit unsigned int */
 907
 908 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 909 {
 910     uint16_t *v = pv;
 911     qemu_get_be16s(f, v);
 912     return 0;
 913 }
 914
 915 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 916 {
 917     uint16_t *v = pv;
 918     qemu_put_be16s(f, v);
 919 }
 920
 921 const VMStateInfo vmstate_info_uint16 = {
 922     .name = "uint16",
 923     .get  = get_uint16,
 924     .put  = put_uint16,
 925 };
 926
 927 /* 32 bit unsigned int */
 928
 929 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 930 {
 931     uint32_t *v = pv;
 932     qemu_get_be32s(f, v);
 933     return 0;
 934 }
 935
 936 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 937 {
 938     uint32_t *v = pv;
 939     qemu_put_be32s(f, v);
 940 }
 941
 942 const VMStateInfo vmstate_info_uint32 = {
 943     .name = "uint32",
 944     .get  = get_uint32,
 945     .put  = put_uint32,
 946 };
 947
 948 /* 32 bit uint. See that the received value is the same than the one
 949    in the field */
 950
 951 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
 952 {
 953     uint32_t *v = pv;
 954     uint32_t v2;
 955     qemu_get_be32s(f, &v2);
 956
 957     if (*v == v2) {
 958         return 0;
 959     }
 960     return -EINVAL;
 961 }
 962
 963 const VMStateInfo vmstate_info_uint32_equal = {
 964     .name = "uint32 equal",
 965     .get  = get_uint32_equal,
 966     .put  = put_uint32,
 967 };
 968
 969 /* 64 bit unsigned int */
 970
 971 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 972 {
 973     uint64_t *v = pv;
 974     qemu_get_be64s(f, v);
 975     return 0;
 976 }
 977
 978 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 979 {
 980     uint64_t *v = pv;
 981     qemu_put_be64s(f, v);
 982 }
 983
 984 const VMStateInfo vmstate_info_uint64 = {
 985     .name = "uint64",
 986     .get  = get_uint64,
 987     .put  = put_uint64,
 988 };
 989
 990 /* 8 bit int. See that the received value is the same than the one
 991    in the field */
 992
 993 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 994 {
 995     uint8_t *v = pv;
 996     uint8_t v2;
 997     qemu_get_8s(f, &v2);
 998
 999     if (*v == v2)
1000         return 0;
1001     return -EINVAL;
1002 }
1003
1004 const VMStateInfo vmstate_info_uint8_equal = {
1005     .name = "uint8 equal",
1006     .get  = get_uint8_equal,
1007     .put  = put_uint8,
1008 };
1009
1010 /* 16 bit unsigned int int. See that the received value is the same than the one
1011    in the field */
1012
1013 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1014 {
1015     uint16_t *v = pv;
1016     uint16_t v2;
1017     qemu_get_be16s(f, &v2);
1018
1019     if (*v == v2)
1020         return 0;
1021     return -EINVAL;
1022 }
1023
1024 const VMStateInfo vmstate_info_uint16_equal = {
1025     .name = "uint16 equal",
1026     .get  = get_uint16_equal,
1027     .put  = put_uint16,
1028 };
1029
1030 /* timers  */
1031
1032 static int get_timer(QEMUFile *f, void *pv, size_t size)
1033 {
1034     QEMUTimer *v = pv;
1035     qemu_get_timer(f, v);
1036     return 0;
1037 }
1038
1039 static void put_timer(QEMUFile *f, void *pv, size_t size)
1040 {
1041     QEMUTimer *v = pv;
1042     qemu_put_timer(f, v);
1043 }
1044
1045 const VMStateInfo vmstate_info_timer = {
1046     .name = "timer",
1047     .get  = get_timer,
1048     .put  = put_timer,
1049 };
1050
1051 /* uint8_t buffers */
1052
1053 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1054 {
1055     uint8_t *v = pv;
1056     qemu_get_buffer(f, v, size);
1057     return 0;
1058 }
1059
1060 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1061 {
1062     uint8_t *v = pv;
1063     qemu_put_buffer(f, v, size);
1064 }
1065
1066 const VMStateInfo vmstate_info_buffer = {
1067     .name = "buffer",
1068     .get  = get_buffer,
1069     .put  = put_buffer,
1070 };
1071
1072 /* unused buffers: space that was used for some fields that are
1073    not useful anymore */
1074
1075 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1076 {
1077     uint8_t buf[1024];
1078     int block_len;
1079
1080     while (size > 0) {
1081         block_len = MIN(sizeof(buf), size);
1082         size -= block_len;
1083         qemu_get_buffer(f, buf, block_len);
1084     }
1085    return 0;
1086 }
1087
1088 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1089 {
1090     static const uint8_t buf[1024];
1091     int block_len;
1092
1093     while (size > 0) {
1094         block_len = MIN(sizeof(buf), size);
1095         size -= block_len;
1096         qemu_put_buffer(f, buf, block_len);
1097     }
1098 }
1099
1100 const VMStateInfo vmstate_info_unused_buffer = {
1101     .name = "unused_buffer",
1102     .get  = get_unused_buffer,
1103     .put  = put_unused_buffer,
1104 };
1105
1106 typedef struct CompatEntry {
1107     char idstr[256];
1108     int instance_id;
1109 } CompatEntry;
1110
1111 typedef struct SaveStateEntry {
1112     QTAILQ_ENTRY(SaveStateEntry) entry;
1113     char idstr[256];
1114     int instance_id;
1115     int alias_id;
1116     int version_id;
1117     int section_id;
1118     SaveSetParamsHandler *set_params;
1119     SaveLiveStateHandler *save_live_state;
1120     SaveStateHandler *save_state;
1121     LoadStateHandler *load_state;
1122     const VMStateDescription *vmsd;
1123     void *opaque;
1124     CompatEntry *compat;
1125     int no_migrate;
1126 } SaveStateEntry;
1127
1128
1129 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1130     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1131 static int global_section_id;
1132
1133 static int calculate_new_instance_id(const char *idstr)
1134 {
1135     SaveStateEntry *se;
1136     int instance_id = 0;
1137
1138     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1139         if (strcmp(idstr, se->idstr) == 0
1140             && instance_id <= se->instance_id) {
1141             instance_id = se->instance_id + 1;
1142         }
1143     }
1144     return instance_id;
1145 }
1146
1147 static int calculate_compat_instance_id(const char *idstr)
1148 {
1149     SaveStateEntry *se;
1150     int instance_id = 0;
1151
1152     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1153         if (!se->compat)
1154             continue;
1155
1156         if (strcmp(idstr, se->compat->idstr) == 0
1157             && instance_id <= se->compat->instance_id) {
1158             instance_id = se->compat->instance_id + 1;
1159         }
1160     }
1161     return instance_id;
1162 }
1163
1164 /* TODO: Individual devices generally have very little idea about the rest
1165    of the system, so instance_id should be removed/replaced.
1166    Meanwhile pass -1 as instance_id if you do not already have a clearly
1167    distinguishing id for all instances of your device class. */
1168 int register_savevm_live(DeviceState *dev,
1169                          const char *idstr,
1170                          int instance_id,
1171                          int version_id,
1172                          SaveSetParamsHandler *set_params,
1173                          SaveLiveStateHandler *save_live_state,
1174                          SaveStateHandler *save_state,
1175                          LoadStateHandler *load_state,
1176                          void *opaque)
1177 {
1178     SaveStateEntry *se;
1179
1180     se = g_malloc0(sizeof(SaveStateEntry));
1181     se->version_id = version_id;
1182     se->section_id = global_section_id++;
1183     se->set_params = set_params;
1184     se->save_live_state = save_live_state;
1185     se->save_state = save_state;
1186     se->load_state = load_state;
1187     se->opaque = opaque;
1188     se->vmsd = NULL;
1189     se->no_migrate = 0;
1190
1191     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1192         char *id = dev->parent_bus->info->get_dev_path(dev);
1193         if (id) {
1194             pstrcpy(se->idstr, sizeof(se->idstr), id);
1195             pstrcat(se->idstr, sizeof(se->idstr), "/");
1196             g_free(id);
1197
1198             se->compat = g_malloc0(sizeof(CompatEntry));
1199             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1200             se->compat->instance_id = instance_id == -1 ?
1201                          calculate_compat_instance_id(idstr) : instance_id;
1202             instance_id = -1;
1203         }
1204     }
1205     pstrcat(se->idstr, sizeof(se->idstr), idstr);
1206
1207     if (instance_id == -1) {
1208         se->instance_id = calculate_new_instance_id(se->idstr);
1209     } else {
1210         se->instance_id = instance_id;
1211     }
1212     assert(!se->compat || se->instance_id == 0);
1213     /* add at the end of list */
1214     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1215     return 0;
1216 }
1217
1218 int register_savevm(DeviceState *dev,
1219                     const char *idstr,
1220                     int instance_id,
1221                     int version_id,
1222                     SaveStateHandler *save_state,
1223                     LoadStateHandler *load_state,
1224                     void *opaque)
1225 {
1226     return register_savevm_live(dev, idstr, instance_id, version_id,
1227                                 NULL, NULL, save_state, load_state, opaque);
1228 }
1229
1230 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1231 {
1232     SaveStateEntry *se, *new_se;
1233     char id[256] = "";
1234
1235     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1236         char *path = dev->parent_bus->info->get_dev_path(dev);
1237         if (path) {
1238             pstrcpy(id, sizeof(id), path);
1239             pstrcat(id, sizeof(id), "/");
1240             g_free(path);
1241         }
1242     }
1243     pstrcat(id, sizeof(id), idstr);
1244
1245     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1246         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1247             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1248             if (se->compat) {
1249                 g_free(se->compat);
1250             }
1251             g_free(se);
1252         }
1253     }
1254 }
1255
1256 /* mark a device as not to be migrated, that is the device should be
1257    unplugged before migration */
1258 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1259                                                             void *opaque)
1260 {
1261     SaveStateEntry *se;
1262     char id[256] = "";
1263
1264     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1265         char *path = dev->parent_bus->info->get_dev_path(dev);
1266         if (path) {
1267             pstrcpy(id, sizeof(id), path);
1268             pstrcat(id, sizeof(id), "/");
1269             g_free(path);
1270         }
1271     }
1272     pstrcat(id, sizeof(id), idstr);
1273
1274     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1275         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1276             se->no_migrate = 1;
1277         }
1278     }
1279 }
1280
1281 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1282                                    const VMStateDescription *vmsd,
1283                                    void *opaque, int alias_id,
1284                                    int required_for_version)
1285 {
1286     SaveStateEntry *se;
1287
1288     /* If this triggers, alias support can be dropped for the vmsd. */
1289     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1290
1291     se = g_malloc0(sizeof(SaveStateEntry));
1292     se->version_id = vmsd->version_id;
1293     se->section_id = global_section_id++;
1294     se->save_live_state = NULL;
1295     se->save_state = NULL;
1296     se->load_state = NULL;
1297     se->opaque = opaque;
1298     se->vmsd = vmsd;
1299     se->alias_id = alias_id;
1300     se->no_migrate = vmsd->unmigratable;
1301
1302     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1303         char *id = dev->parent_bus->info->get_dev_path(dev);
1304         if (id) {
1305             pstrcpy(se->idstr, sizeof(se->idstr), id);
1306             pstrcat(se->idstr, sizeof(se->idstr), "/");
1307             g_free(id);
1308
1309             se->compat = g_malloc0(sizeof(CompatEntry));
1310             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1311             se->compat->instance_id = instance_id == -1 ?
1312                          calculate_compat_instance_id(vmsd->name) : instance_id;
1313             instance_id = -1;
1314         }
1315     }
1316     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1317
1318     if (instance_id == -1) {
1319         se->instance_id = calculate_new_instance_id(se->idstr);
1320     } else {
1321         se->instance_id = instance_id;
1322     }
1323     assert(!se->compat || se->instance_id == 0);
1324     /* add at the end of list */
1325     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1326     return 0;
1327 }
1328
1329 int vmstate_register(DeviceState *dev, int instance_id,
1330                      const VMStateDescription *vmsd, void *opaque)
1331 {
1332     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1333                                           opaque, -1, 0);
1334 }
1335
1336 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1337                         void *opaque)
1338 {
1339     SaveStateEntry *se, *new_se;
1340
1341     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1342         if (se->vmsd == vmsd && se->opaque == opaque) {
1343             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1344             if (se->compat) {
1345                 g_free(se->compat);
1346             }
1347             g_free(se);
1348         }
1349     }
1350 }
1351
1352 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1353                                     void *opaque);
1354 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1355                                    void *opaque);
1356
1357 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1358                        void *opaque, int version_id)
1359 {
1360     VMStateField *field = vmsd->fields;
1361     int ret;
1362
1363     if (version_id > vmsd->version_id) {
1364         return -EINVAL;
1365     }
1366     if (version_id < vmsd->minimum_version_id_old) {
1367         return -EINVAL;
1368     }
1369     if  (version_id < vmsd->minimum_version_id) {
1370         return vmsd->load_state_old(f, opaque, version_id);
1371     }
1372     if (vmsd->pre_load) {
1373         int ret = vmsd->pre_load(opaque);
1374         if (ret)
1375             return ret;
1376     }
1377     while(field->name) {
1378         if ((field->field_exists &&
1379              field->field_exists(opaque, version_id)) ||
1380             (!field->field_exists &&
1381              field->version_id <= 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_UINT32) {
1397                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1398             } else if (field->flags & VMS_VARRAY_UINT16) {
1399                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1400             } else if (field->flags & VMS_VARRAY_UINT8) {
1401                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1402             }
1403             if (field->flags & VMS_POINTER) {
1404                 base_addr = *(void **)base_addr + field->start;
1405             }
1406             for (i = 0; i < n_elems; i++) {
1407                 void *addr = base_addr + size * i;
1408
1409                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1410                     addr = *(void **)addr;
1411                 }
1412                 if (field->flags & VMS_STRUCT) {
1413                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1414                 } else {
1415                     ret = field->info->get(f, addr, size);
1416
1417                 }
1418                 if (ret < 0) {
1419                     return ret;
1420                 }
1421             }
1422         }
1423         field++;
1424     }
1425     ret = vmstate_subsection_load(f, vmsd, opaque);
1426     if (ret != 0) {
1427         return ret;
1428     }
1429     if (vmsd->post_load) {
1430         return vmsd->post_load(opaque, version_id);
1431     }
1432     return 0;
1433 }
1434
1435 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1436                         void *opaque)
1437 {
1438     VMStateField *field = vmsd->fields;
1439
1440     if (vmsd->pre_save) {
1441         vmsd->pre_save(opaque);
1442     }
1443     while(field->name) {
1444         if (!field->field_exists ||
1445             field->field_exists(opaque, vmsd->version_id)) {
1446             void *base_addr = opaque + field->offset;
1447             int i, n_elems = 1;
1448             int size = field->size;
1449
1450             if (field->flags & VMS_VBUFFER) {
1451                 size = *(int32_t *)(opaque+field->size_offset);
1452                 if (field->flags & VMS_MULTIPLY) {
1453                     size *= field->size;
1454                 }
1455             }
1456             if (field->flags & VMS_ARRAY) {
1457                 n_elems = field->num;
1458             } else if (field->flags & VMS_VARRAY_INT32) {
1459                 n_elems = *(int32_t *)(opaque+field->num_offset);
1460             } else if (field->flags & VMS_VARRAY_UINT16) {
1461                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1462             } else if (field->flags & VMS_VARRAY_UINT8) {
1463                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1464             }
1465             if (field->flags & VMS_POINTER) {
1466                 base_addr = *(void **)base_addr + field->start;
1467             }
1468             for (i = 0; i < n_elems; i++) {
1469                 void *addr = base_addr + size * i;
1470
1471                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1472                     addr = *(void **)addr;
1473                 }
1474                 if (field->flags & VMS_STRUCT) {
1475                     vmstate_save_state(f, field->vmsd, addr);
1476                 } else {
1477                     field->info->put(f, addr, size);
1478                 }
1479             }
1480         }
1481         field++;
1482     }
1483     vmstate_subsection_save(f, vmsd, opaque);
1484 }
1485
1486 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1487 {
1488     if (!se->vmsd) {         /* Old style */
1489         return se->load_state(f, se->opaque, version_id);
1490     }
1491     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1492 }
1493
1494 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1495 {
1496     if (!se->vmsd) {         /* Old style */
1497         se->save_state(f, se->opaque);
1498         return;
1499     }
1500     vmstate_save_state(f,se->vmsd, se->opaque);
1501 }
1502
1503 #define QEMU_VM_FILE_MAGIC           0x5145564d
1504 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1505 #define QEMU_VM_FILE_VERSION         0x00000003
1506
1507 #define QEMU_VM_EOF                  0x00
1508 #define QEMU_VM_SECTION_START        0x01
1509 #define QEMU_VM_SECTION_PART         0x02
1510 #define QEMU_VM_SECTION_END          0x03
1511 #define QEMU_VM_SECTION_FULL         0x04
1512 #define QEMU_VM_SUBSECTION           0x05
1513
1514 bool qemu_savevm_state_blocked(Monitor *mon)
1515 {
1516     SaveStateEntry *se;
1517
1518     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1519         if (se->no_migrate) {
1520             monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
1521                            se->idstr);
1522             return true;
1523         }
1524     }
1525     return false;
1526 }
1527
1528 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1529                             int shared)
1530 {
1531     SaveStateEntry *se;
1532     int ret;
1533
1534     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1535         if(se->set_params == NULL) {
1536             continue;
1537         }
1538         se->set_params(blk_enable, shared, se->opaque);
1539     }
1540
1541     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1542     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1543
1544     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1545         int len;
1546
1547         if (se->save_live_state == NULL)
1548             continue;
1549
1550         /* Section type */
1551         qemu_put_byte(f, QEMU_VM_SECTION_START);
1552         qemu_put_be32(f, se->section_id);
1553
1554         /* ID string */
1555         len = strlen(se->idstr);
1556         qemu_put_byte(f, len);
1557         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1558
1559         qemu_put_be32(f, se->instance_id);
1560         qemu_put_be32(f, se->version_id);
1561
1562         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1563         if (ret < 0) {
1564             qemu_savevm_state_cancel(mon, f);
1565             return ret;
1566         }
1567     }
1568     ret = qemu_file_get_error(f);
1569     if (ret != 0) {
1570         qemu_savevm_state_cancel(mon, f);
1571     }
1572
1573     return ret;
1574
1575 }
1576
1577 /*
1578  * this funtion has three return values:
1579  *   negative: there was one error, and we have -errno.
1580  *   0 : We haven't finished, caller have to go again
1581  *   1 : We have finished, we can go to complete phase
1582  */
1583 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1584 {
1585     SaveStateEntry *se;
1586     int ret = 1;
1587
1588     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1589         if (se->save_live_state == NULL)
1590             continue;
1591
1592         /* Section type */
1593         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1594         qemu_put_be32(f, se->section_id);
1595
1596         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1597         if (ret <= 0) {
1598             /* Do not proceed to the next vmstate before this one reported
1599                completion of the current stage. This serializes the migration
1600                and reduces the probability that a faster changing state is
1601                synchronized over and over again. */
1602             break;
1603         }
1604     }
1605     if (ret != 0) {
1606         return ret;
1607     }
1608     ret = qemu_file_get_error(f);
1609     if (ret != 0) {
1610         qemu_savevm_state_cancel(mon, f);
1611     }
1612     return ret;
1613 }
1614
1615 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1616 {
1617     SaveStateEntry *se;
1618     int ret;
1619
1620     cpu_synchronize_all_states();
1621
1622     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1623         if (se->save_live_state == NULL)
1624             continue;
1625
1626         /* Section type */
1627         qemu_put_byte(f, QEMU_VM_SECTION_END);
1628         qemu_put_be32(f, se->section_id);
1629
1630         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1631         if (ret < 0) {
1632             return ret;
1633         }
1634     }
1635
1636     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1637         int len;
1638
1639         if (se->save_state == NULL && se->vmsd == NULL)
1640             continue;
1641
1642         /* Section type */
1643         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1644         qemu_put_be32(f, se->section_id);
1645
1646         /* ID string */
1647         len = strlen(se->idstr);
1648         qemu_put_byte(f, len);
1649         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1650
1651         qemu_put_be32(f, se->instance_id);
1652         qemu_put_be32(f, se->version_id);
1653
1654         vmstate_save(f, se);
1655     }
1656
1657     qemu_put_byte(f, QEMU_VM_EOF);
1658
1659     return qemu_file_get_error(f);
1660 }
1661
1662 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1663 {
1664     SaveStateEntry *se;
1665
1666     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1667         if (se->save_live_state) {
1668             se->save_live_state(mon, f, -1, se->opaque);
1669         }
1670     }
1671 }
1672
1673 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1674 {
1675     int ret;
1676
1677     if (qemu_savevm_state_blocked(mon)) {
1678         ret = -EINVAL;
1679         goto out;
1680     }
1681
1682     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1683     if (ret < 0)
1684         goto out;
1685
1686     do {
1687         ret = qemu_savevm_state_iterate(mon, f);
1688         if (ret < 0)
1689             goto out;
1690     } while (ret == 0);
1691
1692     ret = qemu_savevm_state_complete(mon, f);
1693
1694 out:
1695     if (ret == 0) {
1696         ret = qemu_file_get_error(f);
1697     }
1698
1699     return ret;
1700 }
1701
1702 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1703 {
1704     SaveStateEntry *se;
1705
1706     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1707         if (!strcmp(se->idstr, idstr) &&
1708             (instance_id == se->instance_id ||
1709              instance_id == se->alias_id))
1710             return se;
1711         /* Migrating from an older version? */
1712         if (strstr(se->idstr, idstr) && se->compat) {
1713             if (!strcmp(se->compat->idstr, idstr) &&
1714                 (instance_id == se->compat->instance_id ||
1715                  instance_id == se->alias_id))
1716                 return se;
1717         }
1718     }
1719     return NULL;
1720 }
1721
1722 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1723 {
1724     while(sub && sub->needed) {
1725         if (strcmp(idstr, sub->vmsd->name) == 0) {
1726             return sub->vmsd;
1727         }
1728         sub++;
1729     }
1730     return NULL;
1731 }
1732
1733 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1734                                    void *opaque)
1735 {
1736     while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
1737         char idstr[256];
1738         int ret;
1739         uint8_t version_id, len, size;
1740         const VMStateDescription *sub_vmsd;
1741
1742         len = qemu_peek_byte(f, 1);
1743         if (len < strlen(vmsd->name) + 1) {
1744             /* subsection name has be be "section_name/a" */
1745             return 0;
1746         }
1747         size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
1748         if (size != len) {
1749             return 0;
1750         }
1751         idstr[size] = 0;
1752
1753         if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
1754             /* it don't have a valid subsection name */
1755             return 0;
1756         }
1757         sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1758         if (sub_vmsd == NULL) {
1759             return -ENOENT;
1760         }
1761         qemu_file_skip(f, 1); /* subsection */
1762         qemu_file_skip(f, 1); /* len */
1763         qemu_file_skip(f, len); /* idstr */
1764         version_id = qemu_get_be32(f);
1765
1766         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1767         if (ret) {
1768             return ret;
1769         }
1770     }
1771     return 0;
1772 }
1773
1774 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1775                                     void *opaque)
1776 {
1777     const VMStateSubsection *sub = vmsd->subsections;
1778
1779     while (sub && sub->needed) {
1780         if (sub->needed(opaque)) {
1781             const VMStateDescription *vmsd = sub->vmsd;
1782             uint8_t len;
1783
1784             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1785             len = strlen(vmsd->name);
1786             qemu_put_byte(f, len);
1787             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1788             qemu_put_be32(f, vmsd->version_id);
1789             vmstate_save_state(f, vmsd, opaque);
1790         }
1791         sub++;
1792     }
1793 }
1794
1795 typedef struct LoadStateEntry {
1796     QLIST_ENTRY(LoadStateEntry) entry;
1797     SaveStateEntry *se;
1798     int section_id;
1799     int version_id;
1800 } LoadStateEntry;
1801
1802 int qemu_loadvm_state(QEMUFile *f)
1803 {
1804     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1805         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1806     LoadStateEntry *le, *new_le;
1807     uint8_t section_type;
1808     unsigned int v;
1809     int ret;
1810
1811     if (qemu_savevm_state_blocked(default_mon)) {
1812         return -EINVAL;
1813     }
1814
1815     v = qemu_get_be32(f);
1816     if (v != QEMU_VM_FILE_MAGIC)
1817         return -EINVAL;
1818
1819     v = qemu_get_be32(f);
1820     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1821         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1822         return -ENOTSUP;
1823     }
1824     if (v != QEMU_VM_FILE_VERSION)
1825         return -ENOTSUP;
1826
1827     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1828         uint32_t instance_id, version_id, section_id;
1829         SaveStateEntry *se;
1830         char idstr[257];
1831         int len;
1832
1833         switch (section_type) {
1834         case QEMU_VM_SECTION_START:
1835         case QEMU_VM_SECTION_FULL:
1836             /* Read section start */
1837             section_id = qemu_get_be32(f);
1838             len = qemu_get_byte(f);
1839             qemu_get_buffer(f, (uint8_t *)idstr, len);
1840             idstr[len] = 0;
1841             instance_id = qemu_get_be32(f);
1842             version_id = qemu_get_be32(f);
1843
1844             /* Find savevm section */
1845             se = find_se(idstr, instance_id);
1846             if (se == NULL) {
1847                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1848                 ret = -EINVAL;
1849                 goto out;
1850             }
1851
1852             /* Validate version */
1853             if (version_id > se->version_id) {
1854                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1855                         version_id, idstr, se->version_id);
1856                 ret = -EINVAL;
1857                 goto out;
1858             }
1859
1860             /* Add entry */
1861             le = g_malloc0(sizeof(*le));
1862
1863             le->se = se;
1864             le->section_id = section_id;
1865             le->version_id = version_id;
1866             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1867
1868             ret = vmstate_load(f, le->se, le->version_id);
1869             if (ret < 0) {
1870                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1871                         instance_id, idstr);
1872                 goto out;
1873             }
1874             break;
1875         case QEMU_VM_SECTION_PART:
1876         case QEMU_VM_SECTION_END:
1877             section_id = qemu_get_be32(f);
1878
1879             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1880                 if (le->section_id == section_id) {
1881                     break;
1882                 }
1883             }
1884             if (le == NULL) {
1885                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1886                 ret = -EINVAL;
1887                 goto out;
1888             }
1889
1890             ret = vmstate_load(f, le->se, le->version_id);
1891             if (ret < 0) {
1892                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1893                         section_id);
1894                 goto out;
1895             }
1896             break;
1897         default:
1898             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1899             ret = -EINVAL;
1900             goto out;
1901         }
1902     }
1903
1904     cpu_synchronize_all_post_init();
1905
1906     ret = 0;
1907
1908 out:
1909     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1910         QLIST_REMOVE(le, entry);
1911         g_free(le);
1912     }
1913
1914     if (ret == 0) {
1915         ret = qemu_file_get_error(f);
1916     }
1917
1918     return ret;
1919 }
1920
1921 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1922                               const char *name)
1923 {
1924     QEMUSnapshotInfo *sn_tab, *sn;
1925     int nb_sns, i, ret;
1926
1927     ret = -ENOENT;
1928     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1929     if (nb_sns < 0)
1930         return ret;
1931     for(i = 0; i < nb_sns; i++) {
1932         sn = &sn_tab[i];
1933         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1934             *sn_info = *sn;
1935             ret = 0;
1936             break;
1937         }
1938     }
1939     g_free(sn_tab);
1940     return ret;
1941 }
1942
1943 /*
1944  * Deletes snapshots of a given name in all opened images.
1945  */
1946 static int del_existing_snapshots(Monitor *mon, const char *name)
1947 {
1948     BlockDriverState *bs;
1949     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1950     int ret;
1951
1952     bs = NULL;
1953     while ((bs = bdrv_next(bs))) {
1954         if (bdrv_can_snapshot(bs) &&
1955             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1956         {
1957             ret = bdrv_snapshot_delete(bs, name);
1958             if (ret < 0) {
1959                 monitor_printf(mon,
1960                                "Error while deleting snapshot on '%s'\n",
1961                                bdrv_get_device_name(bs));
1962                 return -1;
1963             }
1964         }
1965     }
1966
1967     return 0;
1968 }
1969
1970 void do_savevm(Monitor *mon, const QDict *qdict)
1971 {
1972     BlockDriverState *bs, *bs1;
1973     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1974     int ret;
1975     QEMUFile *f;
1976     int saved_vm_running;
1977     uint32_t vm_state_size;
1978 #ifdef _WIN32
1979     struct _timeb tb;
1980     struct tm *ptm;
1981 #else
1982     struct timeval tv;
1983     struct tm tm;
1984 #endif
1985     const char *name = qdict_get_try_str(qdict, "name");
1986
1987     /* Verify if there is a device that doesn't support snapshots and is writable */
1988     bs = NULL;
1989     while ((bs = bdrv_next(bs))) {
1990
1991         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
1992             continue;
1993         }
1994
1995         if (!bdrv_can_snapshot(bs)) {
1996             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1997                                bdrv_get_device_name(bs));
1998             return;
1999         }
2000     }
2001
2002     bs = bdrv_snapshots();
2003     if (!bs) {
2004         monitor_printf(mon, "No block device can accept snapshots\n");
2005         return;
2006     }
2007
2008     saved_vm_running = runstate_is_running();
2009     vm_stop(RUN_STATE_SAVE_VM);
2010
2011     memset(sn, 0, sizeof(*sn));
2012
2013     /* fill auxiliary fields */
2014 #ifdef _WIN32
2015     _ftime(&tb);
2016     sn->date_sec = tb.time;
2017     sn->date_nsec = tb.millitm * 1000000;
2018 #else
2019     gettimeofday(&tv, NULL);
2020     sn->date_sec = tv.tv_sec;
2021     sn->date_nsec = tv.tv_usec * 1000;
2022 #endif
2023     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2024
2025     if (name) {
2026         ret = bdrv_snapshot_find(bs, old_sn, name);
2027         if (ret >= 0) {
2028             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2029             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2030         } else {
2031             pstrcpy(sn->name, sizeof(sn->name), name);
2032         }
2033     } else {
2034 #ifdef _WIN32
2035         ptm = localtime(&tb.time);
2036         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
2037 #else
2038         /* cast below needed for OpenBSD where tv_sec is still 'long' */
2039         localtime_r((const time_t *)&tv.tv_sec, &tm);
2040         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2041 #endif
2042     }
2043
2044     /* Delete old snapshots of the same name */
2045     if (name && del_existing_snapshots(mon, name) < 0) {
2046         goto the_end;
2047     }
2048
2049     /* save the VM state */
2050     f = qemu_fopen_bdrv(bs, 1);
2051     if (!f) {
2052         monitor_printf(mon, "Could not open VM state file\n");
2053         goto the_end;
2054     }
2055     ret = qemu_savevm_state(mon, f);
2056     vm_state_size = qemu_ftell(f);
2057     qemu_fclose(f);
2058     if (ret < 0) {
2059         monitor_printf(mon, "Error %d while writing VM\n", ret);
2060         goto the_end;
2061     }
2062
2063     /* create the snapshots */
2064
2065     bs1 = NULL;
2066     while ((bs1 = bdrv_next(bs1))) {
2067         if (bdrv_can_snapshot(bs1)) {
2068             /* Write VM state size only to the image that contains the state */
2069             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2070             ret = bdrv_snapshot_create(bs1, sn);
2071             if (ret < 0) {
2072                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2073                                bdrv_get_device_name(bs1));
2074             }
2075         }
2076     }
2077
2078  the_end:
2079     if (saved_vm_running)
2080         vm_start();
2081 }
2082
2083 int load_vmstate(const char *name)
2084 {
2085     BlockDriverState *bs, *bs_vm_state;
2086     QEMUSnapshotInfo sn;
2087     QEMUFile *f;
2088     int ret;
2089
2090     bs_vm_state = bdrv_snapshots();
2091     if (!bs_vm_state) {
2092         error_report("No block device supports snapshots");
2093         return -ENOTSUP;
2094     }
2095
2096     /* Don't even try to load empty VM states */
2097     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2098     if (ret < 0) {
2099         return ret;
2100     } else if (sn.vm_state_size == 0) {
2101         error_report("This is a disk-only snapshot. Revert to it offline "
2102             "using qemu-img.");
2103         return -EINVAL;
2104     }
2105
2106     /* Verify if there is any device that doesn't support snapshots and is
2107     writable and check if the requested snapshot is available too. */
2108     bs = NULL;
2109     while ((bs = bdrv_next(bs))) {
2110
2111         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2112             continue;
2113         }
2114
2115         if (!bdrv_can_snapshot(bs)) {
2116             error_report("Device '%s' is writable but does not support snapshots.",
2117                                bdrv_get_device_name(bs));
2118             return -ENOTSUP;
2119         }
2120
2121         ret = bdrv_snapshot_find(bs, &sn, name);
2122         if (ret < 0) {
2123             error_report("Device '%s' does not have the requested snapshot '%s'",
2124                            bdrv_get_device_name(bs), name);
2125             return ret;
2126         }
2127     }
2128
2129     /* Flush all IO requests so they don't interfere with the new state.  */
2130     qemu_aio_flush();
2131
2132     bs = NULL;
2133     while ((bs = bdrv_next(bs))) {
2134         if (bdrv_can_snapshot(bs)) {
2135             ret = bdrv_snapshot_goto(bs, name);
2136             if (ret < 0) {
2137                 error_report("Error %d while activating snapshot '%s' on '%s'",
2138                              ret, name, bdrv_get_device_name(bs));
2139                 return ret;
2140             }
2141         }
2142     }
2143
2144     /* restore the VM state */
2145     f = qemu_fopen_bdrv(bs_vm_state, 0);
2146     if (!f) {
2147         error_report("Could not open VM state file");
2148         return -EINVAL;
2149     }
2150
2151     qemu_system_reset(VMRESET_SILENT);
2152     ret = qemu_loadvm_state(f);
2153
2154     qemu_fclose(f);
2155     if (ret < 0) {
2156         error_report("Error %d while loading VM state", ret);
2157         return ret;
2158     }
2159
2160     return 0;
2161 }
2162
2163 void do_delvm(Monitor *mon, const QDict *qdict)
2164 {
2165     BlockDriverState *bs, *bs1;
2166     int ret;
2167     const char *name = qdict_get_str(qdict, "name");
2168
2169     bs = bdrv_snapshots();
2170     if (!bs) {
2171         monitor_printf(mon, "No block device supports snapshots\n");
2172         return;
2173     }
2174
2175     bs1 = NULL;
2176     while ((bs1 = bdrv_next(bs1))) {
2177         if (bdrv_can_snapshot(bs1)) {
2178             ret = bdrv_snapshot_delete(bs1, name);
2179             if (ret < 0) {
2180                 if (ret == -ENOTSUP)
2181                     monitor_printf(mon,
2182                                    "Snapshots not supported on device '%s'\n",
2183                                    bdrv_get_device_name(bs1));
2184                 else
2185                     monitor_printf(mon, "Error %d while deleting snapshot on "
2186                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2187             }
2188         }
2189     }
2190 }
2191
2192 void do_info_snapshots(Monitor *mon)
2193 {
2194     BlockDriverState *bs, *bs1;
2195     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2196     int nb_sns, i, ret, available;
2197     int total;
2198     int *available_snapshots;
2199     char buf[256];
2200
2201     bs = bdrv_snapshots();
2202     if (!bs) {
2203         monitor_printf(mon, "No available block device supports snapshots\n");
2204         return;
2205     }
2206
2207     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2208     if (nb_sns < 0) {
2209         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2210         return;
2211     }
2212
2213     if (nb_sns == 0) {
2214         monitor_printf(mon, "There is no snapshot available.\n");
2215         return;
2216     }
2217
2218     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2219     total = 0;
2220     for (i = 0; i < nb_sns; i++) {
2221         sn = &sn_tab[i];
2222         available = 1;
2223         bs1 = NULL;
2224
2225         while ((bs1 = bdrv_next(bs1))) {
2226             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2227                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2228                 if (ret < 0) {
2229                     available = 0;
2230                     break;
2231                 }
2232             }
2233         }
2234
2235         if (available) {
2236             available_snapshots[total] = i;
2237             total++;
2238         }
2239     }
2240
2241     if (total > 0) {
2242         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2243         for (i = 0; i < total; i++) {
2244             sn = &sn_tab[available_snapshots[i]];
2245             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2246         }
2247     } else {
2248         monitor_printf(mon, "There is no suitable snapshot available\n");
2249     }
2250
2251     g_free(sn_tab);
2252     g_free(available_snapshots);
2253
2254 }