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 == 0) {
 480         f->last_error = -EIO;
 481     } else if (len != -EAGAIN)
 482         f->last_error = len;
 483 }
 484
 485 int qemu_fclose(QEMUFile *f)
 486 {
 487     int ret = 0;
 488     qemu_fflush(f);
 489     if (f->close)
 490         ret = f->close(f->opaque);
 491     g_free(f);
 492     return ret;
 493 }
 494
 495 void qemu_file_put_notify(QEMUFile *f)
 496 {
 497     f->put_buffer(f->opaque, NULL, 0, 0);
 498 }
 499
 500 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 501 {
 502     int l;
 503
 504     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 505         fprintf(stderr,
 506                 "Attempted to write to buffer while read buffer is not empty\n");
 507         abort();
 508     }
 509
 510     while (!f->last_error && size > 0) {
 511         l = IO_BUF_SIZE - f->buf_index;
 512         if (l > size)
 513             l = size;
 514         memcpy(f->buf + f->buf_index, buf, l);
 515         f->is_write = 1;
 516         f->buf_index += l;
 517         buf += l;
 518         size -= l;
 519         if (f->buf_index >= IO_BUF_SIZE)
 520             qemu_fflush(f);
 521     }
 522 }
 523
 524 void qemu_put_byte(QEMUFile *f, int v)
 525 {
 526     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
 527         fprintf(stderr,
 528                 "Attempted to write to buffer while read buffer is not empty\n");
 529         abort();
 530     }
 531
 532     f->buf[f->buf_index++] = v;
 533     f->is_write = 1;
 534     if (f->buf_index >= IO_BUF_SIZE)
 535         qemu_fflush(f);
 536 }
 537
 538 static void qemu_file_skip(QEMUFile *f, int size)
 539 {
 540     if (f->buf_index + size <= f->buf_size) {
 541         f->buf_index += size;
 542     }
 543 }
 544
 545 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
 546 {
 547     int pending;
 548     int index;
 549
 550     if (f->is_write) {
 551         abort();
 552     }
 553
 554     index = f->buf_index + offset;
 555     pending = f->buf_size - index;
 556     if (pending < size) {
 557         qemu_fill_buffer(f);
 558         index = f->buf_index + offset;
 559         pending = f->buf_size - index;
 560     }
 561
 562     if (pending <= 0) {
 563         return 0;
 564     }
 565     if (size > pending) {
 566         size = pending;
 567     }
 568
 569     memcpy(buf, f->buf + index, size);
 570     return size;
 571 }
 572
 573 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
 574 {
 575     int pending = size;
 576     int done = 0;
 577
 578     while (pending > 0) {
 579         int res;
 580
 581         res = qemu_peek_buffer(f, buf, pending, 0);
 582         if (res == 0) {
 583             return done;
 584         }
 585         qemu_file_skip(f, res);
 586         buf += res;
 587         pending -= res;
 588         done += res;
 589     }
 590     return done;
 591 }
 592
 593 static int qemu_peek_byte(QEMUFile *f, int offset)
 594 {
 595     int index = f->buf_index + offset;
 596
 597     if (f->is_write) {
 598         abort();
 599     }
 600
 601     if (index >= f->buf_size) {
 602         qemu_fill_buffer(f);
 603         index = f->buf_index + offset;
 604         if (index >= f->buf_size) {
 605             return 0;
 606         }
 607     }
 608     return f->buf[index];
 609 }
 610
 611 int qemu_get_byte(QEMUFile *f)
 612 {
 613     int result;
 614
 615     result = qemu_peek_byte(f, 0);
 616     qemu_file_skip(f, 1);
 617     return result;
 618 }
 619
 620 int64_t qemu_ftell(QEMUFile *f)
 621 {
 622     return f->buf_offset - f->buf_size + f->buf_index;
 623 }
 624
 625 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 626 {
 627     if (whence == SEEK_SET) {
 628         /* nothing to do */
 629     } else if (whence == SEEK_CUR) {
 630         pos += qemu_ftell(f);
 631     } else {
 632         /* SEEK_END not supported */
 633         return -1;
 634     }
 635     if (f->put_buffer) {
 636         qemu_fflush(f);
 637         f->buf_offset = pos;
 638     } else {
 639         f->buf_offset = pos;
 640         f->buf_index = 0;
 641         f->buf_size = 0;
 642     }
 643     return pos;
 644 }
 645
 646 int qemu_file_rate_limit(QEMUFile *f)
 647 {
 648     if (f->rate_limit)
 649         return f->rate_limit(f->opaque);
 650
 651     return 0;
 652 }
 653
 654 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 655 {
 656     if (f->get_rate_limit)
 657         return f->get_rate_limit(f->opaque);
 658
 659     return 0;
 660 }
 661
 662 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
 663 {
 664     /* any failed or completed migration keeps its state to allow probing of
 665      * migration data, but has no associated file anymore */
 666     if (f && f->set_rate_limit)
 667         return f->set_rate_limit(f->opaque, new_rate);
 668
 669     return 0;
 670 }
 671
 672 void qemu_put_be16(QEMUFile *f, unsigned int v)
 673 {
 674     qemu_put_byte(f, v >> 8);
 675     qemu_put_byte(f, v);
 676 }
 677
 678 void qemu_put_be32(QEMUFile *f, unsigned int v)
 679 {
 680     qemu_put_byte(f, v >> 24);
 681     qemu_put_byte(f, v >> 16);
 682     qemu_put_byte(f, v >> 8);
 683     qemu_put_byte(f, v);
 684 }
 685
 686 void qemu_put_be64(QEMUFile *f, uint64_t v)
 687 {
 688     qemu_put_be32(f, v >> 32);
 689     qemu_put_be32(f, v);
 690 }
 691
 692 unsigned int qemu_get_be16(QEMUFile *f)
 693 {
 694     unsigned int v;
 695     v = qemu_get_byte(f) << 8;
 696     v |= qemu_get_byte(f);
 697     return v;
 698 }
 699
 700 unsigned int qemu_get_be32(QEMUFile *f)
 701 {
 702     unsigned int v;
 703     v = qemu_get_byte(f) << 24;
 704     v |= qemu_get_byte(f) << 16;
 705     v |= qemu_get_byte(f) << 8;
 706     v |= qemu_get_byte(f);
 707     return v;
 708 }
 709
 710 uint64_t qemu_get_be64(QEMUFile *f)
 711 {
 712     uint64_t v;
 713     v = (uint64_t)qemu_get_be32(f) << 32;
 714     v |= qemu_get_be32(f);
 715     return v;
 716 }
 717
 718
 719 /* timer */
 720
 721 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
 722 {
 723     uint64_t expire_time;
 724
 725     expire_time = qemu_timer_expire_time_ns(ts);
 726     qemu_put_be64(f, expire_time);
 727 }
 728
 729 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
 730 {
 731     uint64_t expire_time;
 732
 733     expire_time = qemu_get_be64(f);
 734     if (expire_time != -1) {
 735         qemu_mod_timer_ns(ts, expire_time);
 736     } else {
 737         qemu_del_timer(ts);
 738     }
 739 }
 740
 741
 742 /* bool */
 743
 744 static int get_bool(QEMUFile *f, void *pv, size_t size)
 745 {
 746     bool *v = pv;
 747     *v = qemu_get_byte(f);
 748     return 0;
 749 }
 750
 751 static void put_bool(QEMUFile *f, void *pv, size_t size)
 752 {
 753     bool *v = pv;
 754     qemu_put_byte(f, *v);
 755 }
 756
 757 const VMStateInfo vmstate_info_bool = {
 758     .name = "bool",
 759     .get  = get_bool,
 760     .put  = put_bool,
 761 };
 762
 763 /* 8 bit int */
 764
 765 static int get_int8(QEMUFile *f, void *pv, size_t size)
 766 {
 767     int8_t *v = pv;
 768     qemu_get_s8s(f, v);
 769     return 0;
 770 }
 771
 772 static void put_int8(QEMUFile *f, void *pv, size_t size)
 773 {
 774     int8_t *v = pv;
 775     qemu_put_s8s(f, v);
 776 }
 777
 778 const VMStateInfo vmstate_info_int8 = {
 779     .name = "int8",
 780     .get  = get_int8,
 781     .put  = put_int8,
 782 };
 783
 784 /* 16 bit int */
 785
 786 static int get_int16(QEMUFile *f, void *pv, size_t size)
 787 {
 788     int16_t *v = pv;
 789     qemu_get_sbe16s(f, v);
 790     return 0;
 791 }
 792
 793 static void put_int16(QEMUFile *f, void *pv, size_t size)
 794 {
 795     int16_t *v = pv;
 796     qemu_put_sbe16s(f, v);
 797 }
 798
 799 const VMStateInfo vmstate_info_int16 = {
 800     .name = "int16",
 801     .get  = get_int16,
 802     .put  = put_int16,
 803 };
 804
 805 /* 32 bit int */
 806
 807 static int get_int32(QEMUFile *f, void *pv, size_t size)
 808 {
 809     int32_t *v = pv;
 810     qemu_get_sbe32s(f, v);
 811     return 0;
 812 }
 813
 814 static void put_int32(QEMUFile *f, void *pv, size_t size)
 815 {
 816     int32_t *v = pv;
 817     qemu_put_sbe32s(f, v);
 818 }
 819
 820 const VMStateInfo vmstate_info_int32 = {
 821     .name = "int32",
 822     .get  = get_int32,
 823     .put  = put_int32,
 824 };
 825
 826 /* 32 bit int. See that the received value is the same than the one
 827    in the field */
 828
 829 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 830 {
 831     int32_t *v = pv;
 832     int32_t v2;
 833     qemu_get_sbe32s(f, &v2);
 834
 835     if (*v == v2)
 836         return 0;
 837     return -EINVAL;
 838 }
 839
 840 const VMStateInfo vmstate_info_int32_equal = {
 841     .name = "int32 equal",
 842     .get  = get_int32_equal,
 843     .put  = put_int32,
 844 };
 845
 846 /* 32 bit int. See that the received value is the less or the same
 847    than the one in the field */
 848
 849 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 850 {
 851     int32_t *old = pv;
 852     int32_t new;
 853     qemu_get_sbe32s(f, &new);
 854
 855     if (*old <= new)
 856         return 0;
 857     return -EINVAL;
 858 }
 859
 860 const VMStateInfo vmstate_info_int32_le = {
 861     .name = "int32 equal",
 862     .get  = get_int32_le,
 863     .put  = put_int32,
 864 };
 865
 866 /* 64 bit int */
 867
 868 static int get_int64(QEMUFile *f, void *pv, size_t size)
 869 {
 870     int64_t *v = pv;
 871     qemu_get_sbe64s(f, v);
 872     return 0;
 873 }
 874
 875 static void put_int64(QEMUFile *f, void *pv, size_t size)
 876 {
 877     int64_t *v = pv;
 878     qemu_put_sbe64s(f, v);
 879 }
 880
 881 const VMStateInfo vmstate_info_int64 = {
 882     .name = "int64",
 883     .get  = get_int64,
 884     .put  = put_int64,
 885 };
 886
 887 /* 8 bit unsigned int */
 888
 889 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 890 {
 891     uint8_t *v = pv;
 892     qemu_get_8s(f, v);
 893     return 0;
 894 }
 895
 896 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 897 {
 898     uint8_t *v = pv;
 899     qemu_put_8s(f, v);
 900 }
 901
 902 const VMStateInfo vmstate_info_uint8 = {
 903     .name = "uint8",
 904     .get  = get_uint8,
 905     .put  = put_uint8,
 906 };
 907
 908 /* 16 bit unsigned int */
 909
 910 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 911 {
 912     uint16_t *v = pv;
 913     qemu_get_be16s(f, v);
 914     return 0;
 915 }
 916
 917 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 918 {
 919     uint16_t *v = pv;
 920     qemu_put_be16s(f, v);
 921 }
 922
 923 const VMStateInfo vmstate_info_uint16 = {
 924     .name = "uint16",
 925     .get  = get_uint16,
 926     .put  = put_uint16,
 927 };
 928
 929 /* 32 bit unsigned int */
 930
 931 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 932 {
 933     uint32_t *v = pv;
 934     qemu_get_be32s(f, v);
 935     return 0;
 936 }
 937
 938 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 939 {
 940     uint32_t *v = pv;
 941     qemu_put_be32s(f, v);
 942 }
 943
 944 const VMStateInfo vmstate_info_uint32 = {
 945     .name = "uint32",
 946     .get  = get_uint32,
 947     .put  = put_uint32,
 948 };
 949
 950 /* 32 bit uint. See that the received value is the same than the one
 951    in the field */
 952
 953 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
 954 {
 955     uint32_t *v = pv;
 956     uint32_t v2;
 957     qemu_get_be32s(f, &v2);
 958
 959     if (*v == v2) {
 960         return 0;
 961     }
 962     return -EINVAL;
 963 }
 964
 965 const VMStateInfo vmstate_info_uint32_equal = {
 966     .name = "uint32 equal",
 967     .get  = get_uint32_equal,
 968     .put  = put_uint32,
 969 };
 970
 971 /* 64 bit unsigned int */
 972
 973 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 974 {
 975     uint64_t *v = pv;
 976     qemu_get_be64s(f, v);
 977     return 0;
 978 }
 979
 980 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 981 {
 982     uint64_t *v = pv;
 983     qemu_put_be64s(f, v);
 984 }
 985
 986 const VMStateInfo vmstate_info_uint64 = {
 987     .name = "uint64",
 988     .get  = get_uint64,
 989     .put  = put_uint64,
 990 };
 991
 992 /* 8 bit int. See that the received value is the same than the one
 993    in the field */
 994
 995 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 996 {
 997     uint8_t *v = pv;
 998     uint8_t v2;
 999     qemu_get_8s(f, &v2);
1000
1001     if (*v == v2)
1002         return 0;
1003     return -EINVAL;
1004 }
1005
1006 const VMStateInfo vmstate_info_uint8_equal = {
1007     .name = "uint8 equal",
1008     .get  = get_uint8_equal,
1009     .put  = put_uint8,
1010 };
1011
1012 /* 16 bit unsigned int int. See that the received value is the same than the one
1013    in the field */
1014
1015 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1016 {
1017     uint16_t *v = pv;
1018     uint16_t v2;
1019     qemu_get_be16s(f, &v2);
1020
1021     if (*v == v2)
1022         return 0;
1023     return -EINVAL;
1024 }
1025
1026 const VMStateInfo vmstate_info_uint16_equal = {
1027     .name = "uint16 equal",
1028     .get  = get_uint16_equal,
1029     .put  = put_uint16,
1030 };
1031
1032 /* timers  */
1033
1034 static int get_timer(QEMUFile *f, void *pv, size_t size)
1035 {
1036     QEMUTimer *v = pv;
1037     qemu_get_timer(f, v);
1038     return 0;
1039 }
1040
1041 static void put_timer(QEMUFile *f, void *pv, size_t size)
1042 {
1043     QEMUTimer *v = pv;
1044     qemu_put_timer(f, v);
1045 }
1046
1047 const VMStateInfo vmstate_info_timer = {
1048     .name = "timer",
1049     .get  = get_timer,
1050     .put  = put_timer,
1051 };
1052
1053 /* uint8_t buffers */
1054
1055 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1056 {
1057     uint8_t *v = pv;
1058     qemu_get_buffer(f, v, size);
1059     return 0;
1060 }
1061
1062 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1063 {
1064     uint8_t *v = pv;
1065     qemu_put_buffer(f, v, size);
1066 }
1067
1068 const VMStateInfo vmstate_info_buffer = {
1069     .name = "buffer",
1070     .get  = get_buffer,
1071     .put  = put_buffer,
1072 };
1073
1074 /* unused buffers: space that was used for some fields that are
1075    not useful anymore */
1076
1077 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1078 {
1079     uint8_t buf[1024];
1080     int block_len;
1081
1082     while (size > 0) {
1083         block_len = MIN(sizeof(buf), size);
1084         size -= block_len;
1085         qemu_get_buffer(f, buf, block_len);
1086     }
1087    return 0;
1088 }
1089
1090 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1091 {
1092     static const uint8_t buf[1024];
1093     int block_len;
1094
1095     while (size > 0) {
1096         block_len = MIN(sizeof(buf), size);
1097         size -= block_len;
1098         qemu_put_buffer(f, buf, block_len);
1099     }
1100 }
1101
1102 const VMStateInfo vmstate_info_unused_buffer = {
1103     .name = "unused_buffer",
1104     .get  = get_unused_buffer,
1105     .put  = put_unused_buffer,
1106 };
1107
1108 typedef struct CompatEntry {
1109     char idstr[256];
1110     int instance_id;
1111 } CompatEntry;
1112
1113 typedef struct SaveStateEntry {
1114     QTAILQ_ENTRY(SaveStateEntry) entry;
1115     char idstr[256];
1116     int instance_id;
1117     int alias_id;
1118     int version_id;
1119     int section_id;
1120     SaveSetParamsHandler *set_params;
1121     SaveLiveStateHandler *save_live_state;
1122     SaveStateHandler *save_state;
1123     LoadStateHandler *load_state;
1124     const VMStateDescription *vmsd;
1125     void *opaque;
1126     CompatEntry *compat;
1127     int no_migrate;
1128 } SaveStateEntry;
1129
1130
1131 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1132     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1133 static int global_section_id;
1134
1135 static int calculate_new_instance_id(const char *idstr)
1136 {
1137     SaveStateEntry *se;
1138     int instance_id = 0;
1139
1140     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1141         if (strcmp(idstr, se->idstr) == 0
1142             && instance_id <= se->instance_id) {
1143             instance_id = se->instance_id + 1;
1144         }
1145     }
1146     return instance_id;
1147 }
1148
1149 static int calculate_compat_instance_id(const char *idstr)
1150 {
1151     SaveStateEntry *se;
1152     int instance_id = 0;
1153
1154     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1155         if (!se->compat)
1156             continue;
1157
1158         if (strcmp(idstr, se->compat->idstr) == 0
1159             && instance_id <= se->compat->instance_id) {
1160             instance_id = se->compat->instance_id + 1;
1161         }
1162     }
1163     return instance_id;
1164 }
1165
1166 /* TODO: Individual devices generally have very little idea about the rest
1167    of the system, so instance_id should be removed/replaced.
1168    Meanwhile pass -1 as instance_id if you do not already have a clearly
1169    distinguishing id for all instances of your device class. */
1170 int register_savevm_live(DeviceState *dev,
1171                          const char *idstr,
1172                          int instance_id,
1173                          int version_id,
1174                          SaveSetParamsHandler *set_params,
1175                          SaveLiveStateHandler *save_live_state,
1176                          SaveStateHandler *save_state,
1177                          LoadStateHandler *load_state,
1178                          void *opaque)
1179 {
1180     SaveStateEntry *se;
1181
1182     se = g_malloc0(sizeof(SaveStateEntry));
1183     se->version_id = version_id;
1184     se->section_id = global_section_id++;
1185     se->set_params = set_params;
1186     se->save_live_state = save_live_state;
1187     se->save_state = save_state;
1188     se->load_state = load_state;
1189     se->opaque = opaque;
1190     se->vmsd = NULL;
1191     se->no_migrate = 0;
1192
1193     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1194         char *id = dev->parent_bus->info->get_dev_path(dev);
1195         if (id) {
1196             pstrcpy(se->idstr, sizeof(se->idstr), id);
1197             pstrcat(se->idstr, sizeof(se->idstr), "/");
1198             g_free(id);
1199
1200             se->compat = g_malloc0(sizeof(CompatEntry));
1201             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1202             se->compat->instance_id = instance_id == -1 ?
1203                          calculate_compat_instance_id(idstr) : instance_id;
1204             instance_id = -1;
1205         }
1206     }
1207     pstrcat(se->idstr, sizeof(se->idstr), idstr);
1208
1209     if (instance_id == -1) {
1210         se->instance_id = calculate_new_instance_id(se->idstr);
1211     } else {
1212         se->instance_id = instance_id;
1213     }
1214     assert(!se->compat || se->instance_id == 0);
1215     /* add at the end of list */
1216     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1217     return 0;
1218 }
1219
1220 int register_savevm(DeviceState *dev,
1221                     const char *idstr,
1222                     int instance_id,
1223                     int version_id,
1224                     SaveStateHandler *save_state,
1225                     LoadStateHandler *load_state,
1226                     void *opaque)
1227 {
1228     return register_savevm_live(dev, idstr, instance_id, version_id,
1229                                 NULL, NULL, save_state, load_state, opaque);
1230 }
1231
1232 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1233 {
1234     SaveStateEntry *se, *new_se;
1235     char id[256] = "";
1236
1237     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1238         char *path = dev->parent_bus->info->get_dev_path(dev);
1239         if (path) {
1240             pstrcpy(id, sizeof(id), path);
1241             pstrcat(id, sizeof(id), "/");
1242             g_free(path);
1243         }
1244     }
1245     pstrcat(id, sizeof(id), idstr);
1246
1247     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1248         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1249             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1250             if (se->compat) {
1251                 g_free(se->compat);
1252             }
1253             g_free(se);
1254         }
1255     }
1256 }
1257
1258 /* mark a device as not to be migrated, that is the device should be
1259    unplugged before migration */
1260 void register_device_unmigratable(DeviceState *dev, const char *idstr,
1261                                                             void *opaque)
1262 {
1263     SaveStateEntry *se;
1264     char id[256] = "";
1265
1266     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1267         char *path = dev->parent_bus->info->get_dev_path(dev);
1268         if (path) {
1269             pstrcpy(id, sizeof(id), path);
1270             pstrcat(id, sizeof(id), "/");
1271             g_free(path);
1272         }
1273     }
1274     pstrcat(id, sizeof(id), idstr);
1275
1276     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1277         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1278             se->no_migrate = 1;
1279         }
1280     }
1281 }
1282
1283 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1284                                    const VMStateDescription *vmsd,
1285                                    void *opaque, int alias_id,
1286                                    int required_for_version)
1287 {
1288     SaveStateEntry *se;
1289
1290     /* If this triggers, alias support can be dropped for the vmsd. */
1291     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1292
1293     se = g_malloc0(sizeof(SaveStateEntry));
1294     se->version_id = vmsd->version_id;
1295     se->section_id = global_section_id++;
1296     se->save_live_state = NULL;
1297     se->save_state = NULL;
1298     se->load_state = NULL;
1299     se->opaque = opaque;
1300     se->vmsd = vmsd;
1301     se->alias_id = alias_id;
1302     se->no_migrate = vmsd->unmigratable;
1303
1304     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
1305         char *id = dev->parent_bus->info->get_dev_path(dev);
1306         if (id) {
1307             pstrcpy(se->idstr, sizeof(se->idstr), id);
1308             pstrcat(se->idstr, sizeof(se->idstr), "/");
1309             g_free(id);
1310
1311             se->compat = g_malloc0(sizeof(CompatEntry));
1312             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1313             se->compat->instance_id = instance_id == -1 ?
1314                          calculate_compat_instance_id(vmsd->name) : instance_id;
1315             instance_id = -1;
1316         }
1317     }
1318     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1319
1320     if (instance_id == -1) {
1321         se->instance_id = calculate_new_instance_id(se->idstr);
1322     } else {
1323         se->instance_id = instance_id;
1324     }
1325     assert(!se->compat || se->instance_id == 0);
1326     /* add at the end of list */
1327     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1328     return 0;
1329 }
1330
1331 int vmstate_register(DeviceState *dev, int instance_id,
1332                      const VMStateDescription *vmsd, void *opaque)
1333 {
1334     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1335                                           opaque, -1, 0);
1336 }
1337
1338 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1339                         void *opaque)
1340 {
1341     SaveStateEntry *se, *new_se;
1342
1343     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1344         if (se->vmsd == vmsd && se->opaque == opaque) {
1345             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1346             if (se->compat) {
1347                 g_free(se->compat);
1348             }
1349             g_free(se);
1350         }
1351     }
1352 }
1353
1354 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1355                                     void *opaque);
1356 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1357                                    void *opaque);
1358
1359 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1360                        void *opaque, int version_id)
1361 {
1362     VMStateField *field = vmsd->fields;
1363     int ret;
1364
1365     if (version_id > vmsd->version_id) {
1366         return -EINVAL;
1367     }
1368     if (version_id < vmsd->minimum_version_id_old) {
1369         return -EINVAL;
1370     }
1371     if  (version_id < vmsd->minimum_version_id) {
1372         return vmsd->load_state_old(f, opaque, version_id);
1373     }
1374     if (vmsd->pre_load) {
1375         int ret = vmsd->pre_load(opaque);
1376         if (ret)
1377             return ret;
1378     }
1379     while(field->name) {
1380         if ((field->field_exists &&
1381              field->field_exists(opaque, version_id)) ||
1382             (!field->field_exists &&
1383              field->version_id <= version_id)) {
1384             void *base_addr = opaque + field->offset;
1385             int i, n_elems = 1;
1386             int size = field->size;
1387
1388             if (field->flags & VMS_VBUFFER) {
1389                 size = *(int32_t *)(opaque+field->size_offset);
1390                 if (field->flags & VMS_MULTIPLY) {
1391                     size *= field->size;
1392                 }
1393             }
1394             if (field->flags & VMS_ARRAY) {
1395                 n_elems = field->num;
1396             } else if (field->flags & VMS_VARRAY_INT32) {
1397                 n_elems = *(int32_t *)(opaque+field->num_offset);
1398             } else if (field->flags & VMS_VARRAY_UINT32) {
1399                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1400             } else if (field->flags & VMS_VARRAY_UINT16) {
1401                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1402             } else if (field->flags & VMS_VARRAY_UINT8) {
1403                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1404             }
1405             if (field->flags & VMS_POINTER) {
1406                 base_addr = *(void **)base_addr + field->start;
1407             }
1408             for (i = 0; i < n_elems; i++) {
1409                 void *addr = base_addr + size * i;
1410
1411                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1412                     addr = *(void **)addr;
1413                 }
1414                 if (field->flags & VMS_STRUCT) {
1415                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1416                 } else {
1417                     ret = field->info->get(f, addr, size);
1418
1419                 }
1420                 if (ret < 0) {
1421                     return ret;
1422                 }
1423             }
1424         }
1425         field++;
1426     }
1427     ret = vmstate_subsection_load(f, vmsd, opaque);
1428     if (ret != 0) {
1429         return ret;
1430     }
1431     if (vmsd->post_load) {
1432         return vmsd->post_load(opaque, version_id);
1433     }
1434     return 0;
1435 }
1436
1437 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1438                         void *opaque)
1439 {
1440     VMStateField *field = vmsd->fields;
1441
1442     if (vmsd->pre_save) {
1443         vmsd->pre_save(opaque);
1444     }
1445     while(field->name) {
1446         if (!field->field_exists ||
1447             field->field_exists(opaque, vmsd->version_id)) {
1448             void *base_addr = opaque + field->offset;
1449             int i, n_elems = 1;
1450             int size = field->size;
1451
1452             if (field->flags & VMS_VBUFFER) {
1453                 size = *(int32_t *)(opaque+field->size_offset);
1454                 if (field->flags & VMS_MULTIPLY) {
1455                     size *= field->size;
1456                 }
1457             }
1458             if (field->flags & VMS_ARRAY) {
1459                 n_elems = field->num;
1460             } else if (field->flags & VMS_VARRAY_INT32) {
1461                 n_elems = *(int32_t *)(opaque+field->num_offset);
1462             } else if (field->flags & VMS_VARRAY_UINT16) {
1463                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1464             } else if (field->flags & VMS_VARRAY_UINT8) {
1465                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1466             }
1467             if (field->flags & VMS_POINTER) {
1468                 base_addr = *(void **)base_addr + field->start;
1469             }
1470             for (i = 0; i < n_elems; i++) {
1471                 void *addr = base_addr + size * i;
1472
1473                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1474                     addr = *(void **)addr;
1475                 }
1476                 if (field->flags & VMS_STRUCT) {
1477                     vmstate_save_state(f, field->vmsd, addr);
1478                 } else {
1479                     field->info->put(f, addr, size);
1480                 }
1481             }
1482         }
1483         field++;
1484     }
1485     vmstate_subsection_save(f, vmsd, opaque);
1486 }
1487
1488 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1489 {
1490     if (!se->vmsd) {         /* Old style */
1491         return se->load_state(f, se->opaque, version_id);
1492     }
1493     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1494 }
1495
1496 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1497 {
1498     if (!se->vmsd) {         /* Old style */
1499         se->save_state(f, se->opaque);
1500         return;
1501     }
1502     vmstate_save_state(f,se->vmsd, se->opaque);
1503 }
1504
1505 #define QEMU_VM_FILE_MAGIC           0x5145564d
1506 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1507 #define QEMU_VM_FILE_VERSION         0x00000003
1508
1509 #define QEMU_VM_EOF                  0x00
1510 #define QEMU_VM_SECTION_START        0x01
1511 #define QEMU_VM_SECTION_PART         0x02
1512 #define QEMU_VM_SECTION_END          0x03
1513 #define QEMU_VM_SECTION_FULL         0x04
1514 #define QEMU_VM_SUBSECTION           0x05
1515
1516 bool qemu_savevm_state_blocked(Monitor *mon)
1517 {
1518     SaveStateEntry *se;
1519
1520     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1521         if (se->no_migrate) {
1522             monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
1523                            se->idstr);
1524             return true;
1525         }
1526     }
1527     return false;
1528 }
1529
1530 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1531                             int shared)
1532 {
1533     SaveStateEntry *se;
1534     int ret;
1535
1536     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1537         if(se->set_params == NULL) {
1538             continue;
1539         }
1540         se->set_params(blk_enable, shared, se->opaque);
1541     }
1542
1543     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1544     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1545
1546     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1547         int len;
1548
1549         if (se->save_live_state == NULL)
1550             continue;
1551
1552         /* Section type */
1553         qemu_put_byte(f, QEMU_VM_SECTION_START);
1554         qemu_put_be32(f, se->section_id);
1555
1556         /* ID string */
1557         len = strlen(se->idstr);
1558         qemu_put_byte(f, len);
1559         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1560
1561         qemu_put_be32(f, se->instance_id);
1562         qemu_put_be32(f, se->version_id);
1563
1564         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1565         if (ret < 0) {
1566             qemu_savevm_state_cancel(mon, f);
1567             return ret;
1568         }
1569     }
1570     ret = qemu_file_get_error(f);
1571     if (ret != 0) {
1572         qemu_savevm_state_cancel(mon, f);
1573     }
1574
1575     return ret;
1576
1577 }
1578
1579 /*
1580  * this funtion has three return values:
1581  *   negative: there was one error, and we have -errno.
1582  *   0 : We haven't finished, caller have to go again
1583  *   1 : We have finished, we can go to complete phase
1584  */
1585 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1586 {
1587     SaveStateEntry *se;
1588     int ret = 1;
1589
1590     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1591         if (se->save_live_state == NULL)
1592             continue;
1593
1594         /* Section type */
1595         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1596         qemu_put_be32(f, se->section_id);
1597
1598         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1599         if (ret <= 0) {
1600             /* Do not proceed to the next vmstate before this one reported
1601                completion of the current stage. This serializes the migration
1602                and reduces the probability that a faster changing state is
1603                synchronized over and over again. */
1604             break;
1605         }
1606     }
1607     if (ret != 0) {
1608         return ret;
1609     }
1610     ret = qemu_file_get_error(f);
1611     if (ret != 0) {
1612         qemu_savevm_state_cancel(mon, f);
1613     }
1614     return ret;
1615 }
1616
1617 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1618 {
1619     SaveStateEntry *se;
1620     int ret;
1621
1622     cpu_synchronize_all_states();
1623
1624     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1625         if (se->save_live_state == NULL)
1626             continue;
1627
1628         /* Section type */
1629         qemu_put_byte(f, QEMU_VM_SECTION_END);
1630         qemu_put_be32(f, se->section_id);
1631
1632         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1633         if (ret < 0) {
1634             return ret;
1635         }
1636     }
1637
1638     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1639         int len;
1640
1641         if (se->save_state == NULL && se->vmsd == NULL)
1642             continue;
1643
1644         /* Section type */
1645         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1646         qemu_put_be32(f, se->section_id);
1647
1648         /* ID string */
1649         len = strlen(se->idstr);
1650         qemu_put_byte(f, len);
1651         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1652
1653         qemu_put_be32(f, se->instance_id);
1654         qemu_put_be32(f, se->version_id);
1655
1656         vmstate_save(f, se);
1657     }
1658
1659     qemu_put_byte(f, QEMU_VM_EOF);
1660
1661     return qemu_file_get_error(f);
1662 }
1663
1664 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1665 {
1666     SaveStateEntry *se;
1667
1668     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1669         if (se->save_live_state) {
1670             se->save_live_state(mon, f, -1, se->opaque);
1671         }
1672     }
1673 }
1674
1675 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1676 {
1677     int ret;
1678
1679     if (qemu_savevm_state_blocked(mon)) {
1680         ret = -EINVAL;
1681         goto out;
1682     }
1683
1684     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1685     if (ret < 0)
1686         goto out;
1687
1688     do {
1689         ret = qemu_savevm_state_iterate(mon, f);
1690         if (ret < 0)
1691             goto out;
1692     } while (ret == 0);
1693
1694     ret = qemu_savevm_state_complete(mon, f);
1695
1696 out:
1697     if (ret == 0) {
1698         ret = qemu_file_get_error(f);
1699     }
1700
1701     return ret;
1702 }
1703
1704 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1705 {
1706     SaveStateEntry *se;
1707
1708     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1709         if (!strcmp(se->idstr, idstr) &&
1710             (instance_id == se->instance_id ||
1711              instance_id == se->alias_id))
1712             return se;
1713         /* Migrating from an older version? */
1714         if (strstr(se->idstr, idstr) && se->compat) {
1715             if (!strcmp(se->compat->idstr, idstr) &&
1716                 (instance_id == se->compat->instance_id ||
1717                  instance_id == se->alias_id))
1718                 return se;
1719         }
1720     }
1721     return NULL;
1722 }
1723
1724 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1725 {
1726     while(sub && sub->needed) {
1727         if (strcmp(idstr, sub->vmsd->name) == 0) {
1728             return sub->vmsd;
1729         }
1730         sub++;
1731     }
1732     return NULL;
1733 }
1734
1735 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1736                                    void *opaque)
1737 {
1738     while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
1739         char idstr[256];
1740         int ret;
1741         uint8_t version_id, len, size;
1742         const VMStateDescription *sub_vmsd;
1743
1744         len = qemu_peek_byte(f, 1);
1745         if (len < strlen(vmsd->name) + 1) {
1746             /* subsection name has be be "section_name/a" */
1747             return 0;
1748         }
1749         size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
1750         if (size != len) {
1751             return 0;
1752         }
1753         idstr[size] = 0;
1754
1755         if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
1756             /* it don't have a valid subsection name */
1757             return 0;
1758         }
1759         sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1760         if (sub_vmsd == NULL) {
1761             return -ENOENT;
1762         }
1763         qemu_file_skip(f, 1); /* subsection */
1764         qemu_file_skip(f, 1); /* len */
1765         qemu_file_skip(f, len); /* idstr */
1766         version_id = qemu_get_be32(f);
1767
1768         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1769         if (ret) {
1770             return ret;
1771         }
1772     }
1773     return 0;
1774 }
1775
1776 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1777                                     void *opaque)
1778 {
1779     const VMStateSubsection *sub = vmsd->subsections;
1780
1781     while (sub && sub->needed) {
1782         if (sub->needed(opaque)) {
1783             const VMStateDescription *vmsd = sub->vmsd;
1784             uint8_t len;
1785
1786             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1787             len = strlen(vmsd->name);
1788             qemu_put_byte(f, len);
1789             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1790             qemu_put_be32(f, vmsd->version_id);
1791             vmstate_save_state(f, vmsd, opaque);
1792         }
1793         sub++;
1794     }
1795 }
1796
1797 typedef struct LoadStateEntry {
1798     QLIST_ENTRY(LoadStateEntry) entry;
1799     SaveStateEntry *se;
1800     int section_id;
1801     int version_id;
1802 } LoadStateEntry;
1803
1804 int qemu_loadvm_state(QEMUFile *f)
1805 {
1806     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1807         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1808     LoadStateEntry *le, *new_le;
1809     uint8_t section_type;
1810     unsigned int v;
1811     int ret;
1812
1813     if (qemu_savevm_state_blocked(default_mon)) {
1814         return -EINVAL;
1815     }
1816
1817     v = qemu_get_be32(f);
1818     if (v != QEMU_VM_FILE_MAGIC)
1819         return -EINVAL;
1820
1821     v = qemu_get_be32(f);
1822     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1823         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1824         return -ENOTSUP;
1825     }
1826     if (v != QEMU_VM_FILE_VERSION)
1827         return -ENOTSUP;
1828
1829     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1830         uint32_t instance_id, version_id, section_id;
1831         SaveStateEntry *se;
1832         char idstr[257];
1833         int len;
1834
1835         switch (section_type) {
1836         case QEMU_VM_SECTION_START:
1837         case QEMU_VM_SECTION_FULL:
1838             /* Read section start */
1839             section_id = qemu_get_be32(f);
1840             len = qemu_get_byte(f);
1841             qemu_get_buffer(f, (uint8_t *)idstr, len);
1842             idstr[len] = 0;
1843             instance_id = qemu_get_be32(f);
1844             version_id = qemu_get_be32(f);
1845
1846             /* Find savevm section */
1847             se = find_se(idstr, instance_id);
1848             if (se == NULL) {
1849                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1850                 ret = -EINVAL;
1851                 goto out;
1852             }
1853
1854             /* Validate version */
1855             if (version_id > se->version_id) {
1856                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1857                         version_id, idstr, se->version_id);
1858                 ret = -EINVAL;
1859                 goto out;
1860             }
1861
1862             /* Add entry */
1863             le = g_malloc0(sizeof(*le));
1864
1865             le->se = se;
1866             le->section_id = section_id;
1867             le->version_id = version_id;
1868             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1869
1870             ret = vmstate_load(f, le->se, le->version_id);
1871             if (ret < 0) {
1872                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1873                         instance_id, idstr);
1874                 goto out;
1875             }
1876             break;
1877         case QEMU_VM_SECTION_PART:
1878         case QEMU_VM_SECTION_END:
1879             section_id = qemu_get_be32(f);
1880
1881             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1882                 if (le->section_id == section_id) {
1883                     break;
1884                 }
1885             }
1886             if (le == NULL) {
1887                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1888                 ret = -EINVAL;
1889                 goto out;
1890             }
1891
1892             ret = vmstate_load(f, le->se, le->version_id);
1893             if (ret < 0) {
1894                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1895                         section_id);
1896                 goto out;
1897             }
1898             break;
1899         default:
1900             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1901             ret = -EINVAL;
1902             goto out;
1903         }
1904     }
1905
1906     cpu_synchronize_all_post_init();
1907
1908     ret = 0;
1909
1910 out:
1911     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1912         QLIST_REMOVE(le, entry);
1913         g_free(le);
1914     }
1915
1916     if (ret == 0) {
1917         ret = qemu_file_get_error(f);
1918     }
1919
1920     return ret;
1921 }
1922
1923 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1924                               const char *name)
1925 {
1926     QEMUSnapshotInfo *sn_tab, *sn;
1927     int nb_sns, i, ret;
1928
1929     ret = -ENOENT;
1930     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1931     if (nb_sns < 0)
1932         return ret;
1933     for(i = 0; i < nb_sns; i++) {
1934         sn = &sn_tab[i];
1935         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1936             *sn_info = *sn;
1937             ret = 0;
1938             break;
1939         }
1940     }
1941     g_free(sn_tab);
1942     return ret;
1943 }
1944
1945 /*
1946  * Deletes snapshots of a given name in all opened images.
1947  */
1948 static int del_existing_snapshots(Monitor *mon, const char *name)
1949 {
1950     BlockDriverState *bs;
1951     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1952     int ret;
1953
1954     bs = NULL;
1955     while ((bs = bdrv_next(bs))) {
1956         if (bdrv_can_snapshot(bs) &&
1957             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1958         {
1959             ret = bdrv_snapshot_delete(bs, name);
1960             if (ret < 0) {
1961                 monitor_printf(mon,
1962                                "Error while deleting snapshot on '%s'\n",
1963                                bdrv_get_device_name(bs));
1964                 return -1;
1965             }
1966         }
1967     }
1968
1969     return 0;
1970 }
1971
1972 void do_savevm(Monitor *mon, const QDict *qdict)
1973 {
1974     BlockDriverState *bs, *bs1;
1975     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1976     int ret;
1977     QEMUFile *f;
1978     int saved_vm_running;
1979     uint32_t vm_state_size;
1980 #ifdef _WIN32
1981     struct _timeb tb;
1982     struct tm *ptm;
1983 #else
1984     struct timeval tv;
1985     struct tm tm;
1986 #endif
1987     const char *name = qdict_get_try_str(qdict, "name");
1988
1989     /* Verify if there is a device that doesn't support snapshots and is writable */
1990     bs = NULL;
1991     while ((bs = bdrv_next(bs))) {
1992
1993         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
1994             continue;
1995         }
1996
1997         if (!bdrv_can_snapshot(bs)) {
1998             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1999                                bdrv_get_device_name(bs));
2000             return;
2001         }
2002     }
2003
2004     bs = bdrv_snapshots();
2005     if (!bs) {
2006         monitor_printf(mon, "No block device can accept snapshots\n");
2007         return;
2008     }
2009
2010     saved_vm_running = runstate_is_running();
2011     vm_stop(RUN_STATE_SAVE_VM);
2012
2013     memset(sn, 0, sizeof(*sn));
2014
2015     /* fill auxiliary fields */
2016 #ifdef _WIN32
2017     _ftime(&tb);
2018     sn->date_sec = tb.time;
2019     sn->date_nsec = tb.millitm * 1000000;
2020 #else
2021     gettimeofday(&tv, NULL);
2022     sn->date_sec = tv.tv_sec;
2023     sn->date_nsec = tv.tv_usec * 1000;
2024 #endif
2025     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2026
2027     if (name) {
2028         ret = bdrv_snapshot_find(bs, old_sn, name);
2029         if (ret >= 0) {
2030             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2031             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2032         } else {
2033             pstrcpy(sn->name, sizeof(sn->name), name);
2034         }
2035     } else {
2036 #ifdef _WIN32
2037         ptm = localtime(&tb.time);
2038         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
2039 #else
2040         /* cast below needed for OpenBSD where tv_sec is still 'long' */
2041         localtime_r((const time_t *)&tv.tv_sec, &tm);
2042         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2043 #endif
2044     }
2045
2046     /* Delete old snapshots of the same name */
2047     if (name && del_existing_snapshots(mon, name) < 0) {
2048         goto the_end;
2049     }
2050
2051     /* save the VM state */
2052     f = qemu_fopen_bdrv(bs, 1);
2053     if (!f) {
2054         monitor_printf(mon, "Could not open VM state file\n");
2055         goto the_end;
2056     }
2057     ret = qemu_savevm_state(mon, f);
2058     vm_state_size = qemu_ftell(f);
2059     qemu_fclose(f);
2060     if (ret < 0) {
2061         monitor_printf(mon, "Error %d while writing VM\n", ret);
2062         goto the_end;
2063     }
2064
2065     /* create the snapshots */
2066
2067     bs1 = NULL;
2068     while ((bs1 = bdrv_next(bs1))) {
2069         if (bdrv_can_snapshot(bs1)) {
2070             /* Write VM state size only to the image that contains the state */
2071             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2072             ret = bdrv_snapshot_create(bs1, sn);
2073             if (ret < 0) {
2074                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2075                                bdrv_get_device_name(bs1));
2076             }
2077         }
2078     }
2079
2080  the_end:
2081     if (saved_vm_running)
2082         vm_start();
2083 }
2084
2085 int load_vmstate(const char *name)
2086 {
2087     BlockDriverState *bs, *bs_vm_state;
2088     QEMUSnapshotInfo sn;
2089     QEMUFile *f;
2090     int ret;
2091
2092     bs_vm_state = bdrv_snapshots();
2093     if (!bs_vm_state) {
2094         error_report("No block device supports snapshots");
2095         return -ENOTSUP;
2096     }
2097
2098     /* Don't even try to load empty VM states */
2099     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2100     if (ret < 0) {
2101         return ret;
2102     } else if (sn.vm_state_size == 0) {
2103         error_report("This is a disk-only snapshot. Revert to it offline "
2104             "using qemu-img.");
2105         return -EINVAL;
2106     }
2107
2108     /* Verify if there is any device that doesn't support snapshots and is
2109     writable and check if the requested snapshot is available too. */
2110     bs = NULL;
2111     while ((bs = bdrv_next(bs))) {
2112
2113         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2114             continue;
2115         }
2116
2117         if (!bdrv_can_snapshot(bs)) {
2118             error_report("Device '%s' is writable but does not support snapshots.",
2119                                bdrv_get_device_name(bs));
2120             return -ENOTSUP;
2121         }
2122
2123         ret = bdrv_snapshot_find(bs, &sn, name);
2124         if (ret < 0) {
2125             error_report("Device '%s' does not have the requested snapshot '%s'",
2126                            bdrv_get_device_name(bs), name);
2127             return ret;
2128         }
2129     }
2130
2131     /* Flush all IO requests so they don't interfere with the new state.  */
2132     qemu_aio_flush();
2133
2134     bs = NULL;
2135     while ((bs = bdrv_next(bs))) {
2136         if (bdrv_can_snapshot(bs)) {
2137             ret = bdrv_snapshot_goto(bs, name);
2138             if (ret < 0) {
2139                 error_report("Error %d while activating snapshot '%s' on '%s'",
2140                              ret, name, bdrv_get_device_name(bs));
2141                 return ret;
2142             }
2143         }
2144     }
2145
2146     /* restore the VM state */
2147     f = qemu_fopen_bdrv(bs_vm_state, 0);
2148     if (!f) {
2149         error_report("Could not open VM state file");
2150         return -EINVAL;
2151     }
2152
2153     qemu_system_reset(VMRESET_SILENT);
2154     ret = qemu_loadvm_state(f);
2155
2156     qemu_fclose(f);
2157     if (ret < 0) {
2158         error_report("Error %d while loading VM state", ret);
2159         return ret;
2160     }
2161
2162     return 0;
2163 }
2164
2165 void do_delvm(Monitor *mon, const QDict *qdict)
2166 {
2167     BlockDriverState *bs, *bs1;
2168     int ret;
2169     const char *name = qdict_get_str(qdict, "name");
2170
2171     bs = bdrv_snapshots();
2172     if (!bs) {
2173         monitor_printf(mon, "No block device supports snapshots\n");
2174         return;
2175     }
2176
2177     bs1 = NULL;
2178     while ((bs1 = bdrv_next(bs1))) {
2179         if (bdrv_can_snapshot(bs1)) {
2180             ret = bdrv_snapshot_delete(bs1, name);
2181             if (ret < 0) {
2182                 if (ret == -ENOTSUP)
2183                     monitor_printf(mon,
2184                                    "Snapshots not supported on device '%s'\n",
2185                                    bdrv_get_device_name(bs1));
2186                 else
2187                     monitor_printf(mon, "Error %d while deleting snapshot on "
2188                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2189             }
2190         }
2191     }
2192 }
2193
2194 void do_info_snapshots(Monitor *mon)
2195 {
2196     BlockDriverState *bs, *bs1;
2197     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2198     int nb_sns, i, ret, available;
2199     int total;
2200     int *available_snapshots;
2201     char buf[256];
2202
2203     bs = bdrv_snapshots();
2204     if (!bs) {
2205         monitor_printf(mon, "No available block device supports snapshots\n");
2206         return;
2207     }
2208
2209     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2210     if (nb_sns < 0) {
2211         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2212         return;
2213     }
2214
2215     if (nb_sns == 0) {
2216         monitor_printf(mon, "There is no snapshot available.\n");
2217         return;
2218     }
2219
2220     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2221     total = 0;
2222     for (i = 0; i < nb_sns; i++) {
2223         sn = &sn_tab[i];
2224         available = 1;
2225         bs1 = NULL;
2226
2227         while ((bs1 = bdrv_next(bs1))) {
2228             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2229                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2230                 if (ret < 0) {
2231                     available = 0;
2232                     break;
2233                 }
2234             }
2235         }
2236
2237         if (available) {
2238             available_snapshots[total] = i;
2239             total++;
2240         }
2241     }
2242
2243     if (total > 0) {
2244         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2245         for (i = 0; i < total; i++) {
2246             sn = &sn_tab[available_snapshots[i]];
2247             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2248         }
2249     } else {
2250         monitor_printf(mon, "There is no suitable snapshot available\n");
2251     }
2252
2253     g_free(sn_tab);
2254     g_free(available_snapshots);
2255
2256 }