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 <signal.h>
  27 #include <time.h>
  28 #include <errno.h>
  29 #include <sys/time.h>
  30 #include <zlib.h>
  31
  32 /* Needed early for CONFIG_BSD etc. */
  33 #include "config-host.h"
  34
  35 #ifndef _WIN32
  36 #include <sys/times.h>
  37 #include <sys/wait.h>
  38 #include <termios.h>
  39 #include <sys/mman.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/resource.h>
  42 #include <sys/socket.h>
  43 #include <netinet/in.h>
  44 #include <net/if.h>
  45 #if defined(__NetBSD__)
  46 #include <net/if_tap.h>
  47 #endif
  48 #ifdef __linux__
  49 #include <linux/if_tun.h>
  50 #endif
  51 #include <arpa/inet.h>
  52 #include <dirent.h>
  53 #include <netdb.h>
  54 #include <sys/select.h>
  55 #ifdef CONFIG_BSD
  56 #include <sys/stat.h>
  57 #if defined(__FreeBSD__) || defined(__DragonFly__)
  58 #include <libutil.h>
  59 #else
  60 #include <util.h>
  61 #endif
  62 #elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
  63 #include <freebsd/stdlib.h>
  64 #else
  65 #ifdef __linux__
  66 #include <pty.h>
  67 #include <malloc.h>
  68 #include <linux/rtc.h>
  69 #endif
  70 #endif
  71 #endif
  72
  73 #ifdef _WIN32
  74 #include <windows.h>
  75 #include <malloc.h>
  76 #include <sys/timeb.h>
  77 #include <mmsystem.h>
  78 #define getopt_long_only getopt_long
  79 #define memalign(align, size) malloc(size)
  80 #endif
  81
  82 #include "qemu-common.h"
  83 #include "hw/hw.h"
  84 #include "net.h"
  85 #include "monitor.h"
  86 #include "sysemu.h"
  87 #include "qemu-timer.h"
  88 #include "qemu-char.h"
  89 #include "block.h"
  90 #include "audio/audio.h"
  91 #include "migration.h"
  92 #include "qemu_socket.h"
  93
  94 /* point to the block driver where the snapshots are managed */
  95 static BlockDriverState *bs_snapshots;
  96
  97 #define SELF_ANNOUNCE_ROUNDS 5
  98 #define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */
  99 //#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */
 100 #define EXPERIMENTAL_MAGIC 0xf1f23f4f
 101
 102 static int announce_self_create(uint8_t *buf,
 103                                 uint8_t *mac_addr)
 104 {
 105     uint32_t magic = EXPERIMENTAL_MAGIC;
 106     uint16_t proto = htons(ETH_P_EXPERIMENTAL);
 107
 108     /* FIXME: should we send a different packet (arp/rarp/ping)? */
 109
 110     memset(buf, 0, 64);
 111     memset(buf, 0xff, 6);         /* h_dst */
 112     memcpy(buf + 6, mac_addr, 6); /* h_src */
 113     memcpy(buf + 12, &proto, 2);  /* h_proto */
 114     memcpy(buf + 14, &magic, 4);  /* magic */
 115
 116     return 64; /* len */
 117 }
 118
 119 static void qemu_announce_self_once(void *opaque)
 120 {
 121     int i, len;
 122     VLANState *vlan;
 123     VLANClientState *vc;
 124     uint8_t buf[256];
 125     static int count = SELF_ANNOUNCE_ROUNDS;
 126     QEMUTimer *timer = *(QEMUTimer **)opaque;
 127
 128     for (i = 0; i < MAX_NICS; i++) {
 129         if (!nd_table[i].used)
 130             continue;
 131         len = announce_self_create(buf, nd_table[i].macaddr);
 132         vlan = nd_table[i].vlan;
 133         for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
 134             vc->receive(vc, buf, len);
 135         }
 136     }
 137     if (count--) {
 138             qemu_mod_timer(timer, qemu_get_clock(rt_clock) + 100);
 139     } else {
 140             qemu_del_timer(timer);
 141             qemu_free_timer(timer);
 142     }
 143 }
 144
 145 void qemu_announce_self(void)
 146 {
 147         static QEMUTimer *timer;
 148         timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
 149         qemu_announce_self_once(&timer);
 150 }
 151
 152 /***********************************************************/
 153 /* savevm/loadvm support */
 154
 155 #define IO_BUF_SIZE 32768
 156
 157 struct QEMUFile {
 158     QEMUFilePutBufferFunc *put_buffer;
 159     QEMUFileGetBufferFunc *get_buffer;
 160     QEMUFileCloseFunc *close;
 161     QEMUFileRateLimit *rate_limit;
 162     QEMUFileSetRateLimit *set_rate_limit;
 163     void *opaque;
 164     int is_write;
 165
 166     int64_t buf_offset; /* start of buffer when writing, end of buffer
 167                            when reading */
 168     int buf_index;
 169     int buf_size; /* 0 when writing */
 170     uint8_t buf[IO_BUF_SIZE];
 171
 172     int has_error;
 173 };
 174
 175 typedef struct QEMUFileStdio
 176 {
 177     FILE *stdio_file;
 178     QEMUFile *file;
 179 } QEMUFileStdio;
 180
 181 typedef struct QEMUFileSocket
 182 {
 183     int fd;
 184     QEMUFile *file;
 185 } QEMUFileSocket;
 186
 187 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 188 {
 189     QEMUFileSocket *s = opaque;
 190     ssize_t len;
 191
 192     do {
 193         len = recv(s->fd, (void *)buf, size, 0);
 194     } while (len == -1 && socket_error() == EINTR);
 195
 196     if (len == -1)
 197         len = -socket_error();
 198
 199     return len;
 200 }
 201
 202 static int socket_close(void *opaque)
 203 {
 204     QEMUFileSocket *s = opaque;
 205     qemu_free(s);
 206     return 0;
 207 }
 208
 209 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 210 {
 211     QEMUFileStdio *s = opaque;
 212     return fwrite(buf, 1, size, s->stdio_file);
 213 }
 214
 215 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 216 {
 217     QEMUFileStdio *s = opaque;
 218     FILE *fp = s->stdio_file;
 219     int bytes;
 220
 221     do {
 222         clearerr(fp);
 223         bytes = fread(buf, 1, size, fp);
 224     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 225     return bytes;
 226 }
 227
 228 static int stdio_pclose(void *opaque)
 229 {
 230     QEMUFileStdio *s = opaque;
 231     pclose(s->stdio_file);
 232     qemu_free(s);
 233     return 0;
 234 }
 235
 236 static int stdio_fclose(void *opaque)
 237 {
 238     QEMUFileStdio *s = opaque;
 239     fclose(s->stdio_file);
 240     qemu_free(s);
 241     return 0;
 242 }
 243
 244 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 245 {
 246     QEMUFileStdio *s;
 247
 248     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 249         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 250         return NULL;
 251     }
 252
 253     s = qemu_mallocz(sizeof(QEMUFileStdio));
 254
 255     s->stdio_file = stdio_file;
 256
 257     if(mode[0] == 'r') {
 258         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, NULL, NULL);
 259     } else {
 260         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, NULL, NULL);
 261     }
 262     return s->file;
 263 }
 264
 265 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 266 {
 267     FILE *popen_file;
 268
 269     popen_file = popen(command, mode);
 270     if(popen_file == NULL) {
 271         return NULL;
 272     }
 273
 274     return qemu_popen(popen_file, mode);
 275 }
 276
 277 int qemu_stdio_fd(QEMUFile *f)
 278 {
 279     QEMUFileStdio *p;
 280     int fd;
 281
 282     p = (QEMUFileStdio *)f->opaque;
 283     fd = fileno(p->stdio_file);
 284
 285     return fd;
 286 }
 287
 288 QEMUFile *qemu_fdopen(int fd, const char *mode)
 289 {
 290     QEMUFileStdio *s;
 291
 292     if (mode == NULL ||
 293         (mode[0] != 'r' && mode[0] != 'w') ||
 294         mode[1] != 'b' || mode[2] != 0) {
 295         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 296         return NULL;
 297     }
 298
 299     s = qemu_mallocz(sizeof(QEMUFileStdio));
 300     s->stdio_file = fdopen(fd, mode);
 301     if (!s->stdio_file)
 302         goto fail;
 303
 304     if(mode[0] == 'r') {
 305         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose, NULL, NULL);
 306     } else {
 307         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, NULL, NULL);
 308     }
 309     return s->file;
 310
 311 fail:
 312     qemu_free(s);
 313     return NULL;
 314 }
 315
 316 QEMUFile *qemu_fopen_socket(int fd)
 317 {
 318     QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 319
 320     s->fd = fd;
 321     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, NULL, NULL);
 322     return s->file;
 323 }
 324
 325 static int file_put_buffer(void *opaque, const uint8_t *buf,
 326                             int64_t pos, int size)
 327 {
 328     QEMUFileStdio *s = opaque;
 329     fseek(s->stdio_file, pos, SEEK_SET);
 330     fwrite(buf, 1, size, s->stdio_file);
 331     return size;
 332 }
 333
 334 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 335 {
 336     QEMUFileStdio *s = opaque;
 337     fseek(s->stdio_file, pos, SEEK_SET);
 338     return fread(buf, 1, size, s->stdio_file);
 339 }
 340
 341 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 342 {
 343     QEMUFileStdio *s;
 344
 345     if (mode == NULL ||
 346         (mode[0] != 'r' && mode[0] != 'w') ||
 347         mode[1] != 'b' || mode[2] != 0) {
 348         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 349         return NULL;
 350     }
 351
 352     s = qemu_mallocz(sizeof(QEMUFileStdio));
 353
 354     s->stdio_file = fopen(filename, mode);
 355     if (!s->stdio_file)
 356         goto fail;
 357
 358     if(mode[0] == 'w') {
 359         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose, NULL, NULL);
 360     } else {
 361         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, NULL, NULL);
 362     }
 363     return s->file;
 364 fail:
 365     qemu_free(s);
 366     return NULL;
 367 }
 368
 369 static int block_put_buffer(void *opaque, const uint8_t *buf,
 370                            int64_t pos, int size)
 371 {
 372     bdrv_save_vmstate(opaque, buf, pos, size);
 373     return size;
 374 }
 375
 376 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 377 {
 378     return bdrv_load_vmstate(opaque, buf, pos, size);
 379 }
 380
 381 static int bdrv_fclose(void *opaque)
 382 {
 383     return 0;
 384 }
 385
 386 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 387 {
 388     if (is_writable)
 389         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, NULL, NULL);
 390     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL);
 391 }
 392
 393 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 394                          QEMUFileGetBufferFunc *get_buffer,
 395                          QEMUFileCloseFunc *close,
 396                          QEMUFileRateLimit *rate_limit,
 397                          QEMUFileSetRateLimit *set_rate_limit)
 398 {
 399     QEMUFile *f;
 400
 401     f = qemu_mallocz(sizeof(QEMUFile));
 402
 403     f->opaque = opaque;
 404     f->put_buffer = put_buffer;
 405     f->get_buffer = get_buffer;
 406     f->close = close;
 407     f->rate_limit = rate_limit;
 408     f->set_rate_limit = set_rate_limit;
 409     f->is_write = 0;
 410
 411     return f;
 412 }
 413
 414 int qemu_file_has_error(QEMUFile *f)
 415 {
 416     return f->has_error;
 417 }
 418
 419 void qemu_file_set_error(QEMUFile *f)
 420 {
 421     f->has_error = 1;
 422 }
 423
 424 void qemu_fflush(QEMUFile *f)
 425 {
 426     if (!f->put_buffer)
 427         return;
 428
 429     if (f->is_write && f->buf_index > 0) {
 430         int len;
 431
 432         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 433         if (len > 0)
 434             f->buf_offset += f->buf_index;
 435         else
 436             f->has_error = 1;
 437         f->buf_index = 0;
 438     }
 439 }
 440
 441 static void qemu_fill_buffer(QEMUFile *f)
 442 {
 443     int len;
 444
 445     if (!f->get_buffer)
 446         return;
 447
 448     if (f->is_write)
 449         abort();
 450
 451     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 452     if (len > 0) {
 453         f->buf_index = 0;
 454         f->buf_size = len;
 455         f->buf_offset += len;
 456     } else if (len != -EAGAIN)
 457         f->has_error = 1;
 458 }
 459
 460 int qemu_fclose(QEMUFile *f)
 461 {
 462     int ret = 0;
 463     qemu_fflush(f);
 464     if (f->close)
 465         ret = f->close(f->opaque);
 466     qemu_free(f);
 467     return ret;
 468 }
 469
 470 void qemu_file_put_notify(QEMUFile *f)
 471 {
 472     f->put_buffer(f->opaque, NULL, 0, 0);
 473 }
 474
 475 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 476 {
 477     int l;
 478
 479     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 480         fprintf(stderr,
 481                 "Attempted to write to buffer while read buffer is not empty\n");
 482         abort();
 483     }
 484
 485     while (!f->has_error && size > 0) {
 486         l = IO_BUF_SIZE - f->buf_index;
 487         if (l > size)
 488             l = size;
 489         memcpy(f->buf + f->buf_index, buf, l);
 490         f->is_write = 1;
 491         f->buf_index += l;
 492         buf += l;
 493         size -= l;
 494         if (f->buf_index >= IO_BUF_SIZE)
 495             qemu_fflush(f);
 496     }
 497 }
 498
 499 void qemu_put_byte(QEMUFile *f, int v)
 500 {
 501     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 502         fprintf(stderr,
 503                 "Attempted to write to buffer while read buffer is not empty\n");
 504         abort();
 505     }
 506
 507     f->buf[f->buf_index++] = v;
 508     f->is_write = 1;
 509     if (f->buf_index >= IO_BUF_SIZE)
 510         qemu_fflush(f);
 511 }
 512
 513 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 514 {
 515     int size, l;
 516
 517     if (f->is_write)
 518         abort();
 519
 520     size = size1;
 521     while (size > 0) {
 522         l = f->buf_size - f->buf_index;
 523         if (l == 0) {
 524             qemu_fill_buffer(f);
 525             l = f->buf_size - f->buf_index;
 526             if (l == 0)
 527                 break;
 528         }
 529         if (l > size)
 530             l = size;
 531         memcpy(buf, f->buf + f->buf_index, l);
 532         f->buf_index += l;
 533         buf += l;
 534         size -= l;
 535     }
 536     return size1 - size;
 537 }
 538
 539 int qemu_get_byte(QEMUFile *f)
 540 {
 541     if (f->is_write)
 542         abort();
 543
 544     if (f->buf_index >= f->buf_size) {
 545         qemu_fill_buffer(f);
 546         if (f->buf_index >= f->buf_size)
 547             return 0;
 548     }
 549     return f->buf[f->buf_index++];
 550 }
 551
 552 int64_t qemu_ftell(QEMUFile *f)
 553 {
 554     return f->buf_offset - f->buf_size + f->buf_index;
 555 }
 556
 557 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 558 {
 559     if (whence == SEEK_SET) {
 560         /* nothing to do */
 561     } else if (whence == SEEK_CUR) {
 562         pos += qemu_ftell(f);
 563     } else {
 564         /* SEEK_END not supported */
 565         return -1;
 566     }
 567     if (f->put_buffer) {
 568         qemu_fflush(f);
 569         f->buf_offset = pos;
 570     } else {
 571         f->buf_offset = pos;
 572         f->buf_index = 0;
 573         f->buf_size = 0;
 574     }
 575     return pos;
 576 }
 577
 578 int qemu_file_rate_limit(QEMUFile *f)
 579 {
 580     if (f->rate_limit)
 581         return f->rate_limit(f->opaque);
 582
 583     return 0;
 584 }
 585
 586 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
 587 {
 588     /* any failed or completed migration keeps its state to allow probing of
 589      * migration data, but has no associated file anymore */
 590     if (f && f->set_rate_limit)
 591         return f->set_rate_limit(f->opaque, new_rate);
 592
 593     return 0;
 594 }
 595
 596 void qemu_put_be16(QEMUFile *f, unsigned int v)
 597 {
 598     qemu_put_byte(f, v >> 8);
 599     qemu_put_byte(f, v);
 600 }
 601
 602 void qemu_put_be32(QEMUFile *f, unsigned int v)
 603 {
 604     qemu_put_byte(f, v >> 24);
 605     qemu_put_byte(f, v >> 16);
 606     qemu_put_byte(f, v >> 8);
 607     qemu_put_byte(f, v);
 608 }
 609
 610 void qemu_put_be64(QEMUFile *f, uint64_t v)
 611 {
 612     qemu_put_be32(f, v >> 32);
 613     qemu_put_be32(f, v);
 614 }
 615
 616 unsigned int qemu_get_be16(QEMUFile *f)
 617 {
 618     unsigned int v;
 619     v = qemu_get_byte(f) << 8;
 620     v |= qemu_get_byte(f);
 621     return v;
 622 }
 623
 624 unsigned int qemu_get_be32(QEMUFile *f)
 625 {
 626     unsigned int v;
 627     v = qemu_get_byte(f) << 24;
 628     v |= qemu_get_byte(f) << 16;
 629     v |= qemu_get_byte(f) << 8;
 630     v |= qemu_get_byte(f);
 631     return v;
 632 }
 633
 634 uint64_t qemu_get_be64(QEMUFile *f)
 635 {
 636     uint64_t v;
 637     v = (uint64_t)qemu_get_be32(f) << 32;
 638     v |= qemu_get_be32(f);
 639     return v;
 640 }
 641
 642 /* 8 bit int */
 643
 644 static int get_int8(QEMUFile *f, void *pv, size_t size)
 645 {
 646     int8_t *v = pv;
 647     qemu_get_s8s(f, v);
 648     return 0;
 649 }
 650
 651 static void put_int8(QEMUFile *f, const void *pv, size_t size)
 652 {
 653     const int8_t *v = pv;
 654     qemu_put_s8s(f, v);
 655 }
 656
 657 const VMStateInfo vmstate_info_int8 = {
 658     .name = "int8",
 659     .get  = get_int8,
 660     .put  = put_int8,
 661 };
 662
 663 /* 16 bit int */
 664
 665 static int get_int16(QEMUFile *f, void *pv, size_t size)
 666 {
 667     int16_t *v = pv;
 668     qemu_get_sbe16s(f, v);
 669     return 0;
 670 }
 671
 672 static void put_int16(QEMUFile *f, const void *pv, size_t size)
 673 {
 674     const int16_t *v = pv;
 675     qemu_put_sbe16s(f, v);
 676 }
 677
 678 const VMStateInfo vmstate_info_int16 = {
 679     .name = "int16",
 680     .get  = get_int16,
 681     .put  = put_int16,
 682 };
 683
 684 /* 32 bit int */
 685
 686 static int get_int32(QEMUFile *f, void *pv, size_t size)
 687 {
 688     int32_t *v = pv;
 689     qemu_get_sbe32s(f, v);
 690     return 0;
 691 }
 692
 693 static void put_int32(QEMUFile *f, const void *pv, size_t size)
 694 {
 695     const int32_t *v = pv;
 696     qemu_put_sbe32s(f, v);
 697 }
 698
 699 const VMStateInfo vmstate_info_int32 = {
 700     .name = "int32",
 701     .get  = get_int32,
 702     .put  = put_int32,
 703 };
 704
 705 /* 32 bit int. See that the received value is the same than the one
 706    in the field */
 707
 708 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 709 {
 710     int32_t *v = pv;
 711     int32_t v2;
 712     qemu_get_sbe32s(f, &v2);
 713
 714     if (*v == v2)
 715         return 0;
 716     return -EINVAL;
 717 }
 718
 719 const VMStateInfo vmstate_info_int32_equal = {
 720     .name = "int32 equal",
 721     .get  = get_int32_equal,
 722     .put  = put_int32,
 723 };
 724
 725 /* 64 bit int */
 726
 727 static int get_int64(QEMUFile *f, void *pv, size_t size)
 728 {
 729     int64_t *v = pv;
 730     qemu_get_sbe64s(f, v);
 731     return 0;
 732 }
 733
 734 static void put_int64(QEMUFile *f, const void *pv, size_t size)
 735 {
 736     const int64_t *v = pv;
 737     qemu_put_sbe64s(f, v);
 738 }
 739
 740 const VMStateInfo vmstate_info_int64 = {
 741     .name = "int64",
 742     .get  = get_int64,
 743     .put  = put_int64,
 744 };
 745
 746 /* 8 bit unsigned int */
 747
 748 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 749 {
 750     uint8_t *v = pv;
 751     qemu_get_8s(f, v);
 752     return 0;
 753 }
 754
 755 static void put_uint8(QEMUFile *f, const void *pv, size_t size)
 756 {
 757     const uint8_t *v = pv;
 758     qemu_put_8s(f, v);
 759 }
 760
 761 const VMStateInfo vmstate_info_uint8 = {
 762     .name = "uint8",
 763     .get  = get_uint8,
 764     .put  = put_uint8,
 765 };
 766
 767 /* 16 bit unsigned int */
 768
 769 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 770 {
 771     uint16_t *v = pv;
 772     qemu_get_be16s(f, v);
 773     return 0;
 774 }
 775
 776 static void put_uint16(QEMUFile *f, const void *pv, size_t size)
 777 {
 778     const uint16_t *v = pv;
 779     qemu_put_be16s(f, v);
 780 }
 781
 782 const VMStateInfo vmstate_info_uint16 = {
 783     .name = "uint16",
 784     .get  = get_uint16,
 785     .put  = put_uint16,
 786 };
 787
 788 /* 32 bit unsigned int */
 789
 790 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 791 {
 792     uint32_t *v = pv;
 793     qemu_get_be32s(f, v);
 794     return 0;
 795 }
 796
 797 static void put_uint32(QEMUFile *f, const void *pv, size_t size)
 798 {
 799     const uint32_t *v = pv;
 800     qemu_put_be32s(f, v);
 801 }
 802
 803 const VMStateInfo vmstate_info_uint32 = {
 804     .name = "uint32",
 805     .get  = get_uint32,
 806     .put  = put_uint32,
 807 };
 808
 809 /* 64 bit unsigned int */
 810
 811 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 812 {
 813     uint64_t *v = pv;
 814     qemu_get_be64s(f, v);
 815     return 0;
 816 }
 817
 818 static void put_uint64(QEMUFile *f, const void *pv, size_t size)
 819 {
 820     const uint64_t *v = pv;
 821     qemu_put_be64s(f, v);
 822 }
 823
 824 const VMStateInfo vmstate_info_uint64 = {
 825     .name = "uint64",
 826     .get  = get_uint64,
 827     .put  = put_uint64,
 828 };
 829
 830 /* timers  */
 831
 832 static int get_timer(QEMUFile *f, void *pv, size_t size)
 833 {
 834     QEMUTimer *v = pv;
 835     qemu_get_timer(f, v);
 836     return 0;
 837 }
 838
 839 static void put_timer(QEMUFile *f, const void *pv, size_t size)
 840 {
 841     QEMUTimer *v = (void *)pv;
 842     qemu_put_timer(f, v);
 843 }
 844
 845 const VMStateInfo vmstate_info_timer = {
 846     .name = "timer",
 847     .get  = get_timer,
 848     .put  = put_timer,
 849 };
 850
 851 /* uint8_t buffers */
 852
 853 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 854 {
 855     uint8_t *v = pv;
 856     qemu_get_buffer(f, v, size);
 857     return 0;
 858 }
 859
 860 static void put_buffer(QEMUFile *f, const void *pv, size_t size)
 861 {
 862     uint8_t *v = (void *)pv;
 863     qemu_put_buffer(f, v, size);
 864 }
 865
 866 const VMStateInfo vmstate_info_buffer = {
 867     .name = "buffer",
 868     .get  = get_buffer,
 869     .put  = put_buffer,
 870 };
 871
 872 typedef struct SaveStateEntry {
 873     char idstr[256];
 874     int instance_id;
 875     int version_id;
 876     int section_id;
 877     SaveLiveStateHandler *save_live_state;
 878     SaveStateHandler *save_state;
 879     LoadStateHandler *load_state;
 880     const VMStateDescription *vmsd;
 881     void *opaque;
 882     struct SaveStateEntry *next;
 883 } SaveStateEntry;
 884
 885 static SaveStateEntry *first_se;
 886 static int global_section_id;
 887
 888 /* TODO: Individual devices generally have very little idea about the rest
 889    of the system, so instance_id should be removed/replaced.
 890    Meanwhile pass -1 as instance_id if you do not already have a clearly
 891    distinguishing id for all instances of your device class. */
 892 int register_savevm_live(const char *idstr,
 893                          int instance_id,
 894                          int version_id,
 895                          SaveLiveStateHandler *save_live_state,
 896                          SaveStateHandler *save_state,
 897                          LoadStateHandler *load_state,
 898                          void *opaque)
 899 {
 900     SaveStateEntry *se, **pse;
 901
 902     se = qemu_malloc(sizeof(SaveStateEntry));
 903     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
 904     se->instance_id = (instance_id == -1) ? 0 : instance_id;
 905     se->version_id = version_id;
 906     se->section_id = global_section_id++;
 907     se->save_live_state = save_live_state;
 908     se->save_state = save_state;
 909     se->load_state = load_state;
 910     se->opaque = opaque;
 911     se->vmsd = NULL;
 912     se->next = NULL;
 913
 914     /* add at the end of list */
 915     pse = &first_se;
 916     while (*pse != NULL) {
 917         if (instance_id == -1
 918                 && strcmp(se->idstr, (*pse)->idstr) == 0
 919                 && se->instance_id <= (*pse)->instance_id)
 920             se->instance_id = (*pse)->instance_id + 1;
 921         pse = &(*pse)->next;
 922     }
 923     *pse = se;
 924     return 0;
 925 }
 926
 927 int register_savevm(const char *idstr,
 928                     int instance_id,
 929                     int version_id,
 930                     SaveStateHandler *save_state,
 931                     LoadStateHandler *load_state,
 932                     void *opaque)
 933 {
 934     return register_savevm_live(idstr, instance_id, version_id,
 935                                 NULL, save_state, load_state, opaque);
 936 }
 937
 938 void unregister_savevm(const char *idstr, void *opaque)
 939 {
 940     SaveStateEntry **pse;
 941
 942     pse = &first_se;
 943     while (*pse != NULL) {
 944         if (strcmp((*pse)->idstr, idstr) == 0 && (*pse)->opaque == opaque) {
 945             SaveStateEntry *next = (*pse)->next;
 946             qemu_free(*pse);
 947             *pse = next;
 948             continue;
 949         }
 950         pse = &(*pse)->next;
 951     }
 952 }
 953
 954 int vmstate_register(int instance_id, const VMStateDescription *vmsd,
 955                      void *opaque)
 956 {
 957     SaveStateEntry *se, **pse;
 958
 959     se = qemu_malloc(sizeof(SaveStateEntry));
 960     pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
 961     se->instance_id = (instance_id == -1) ? 0 : instance_id;
 962     se->version_id = vmsd->version_id;
 963     se->section_id = global_section_id++;
 964     se->save_live_state = NULL;
 965     se->save_state = NULL;
 966     se->load_state = NULL;
 967     se->opaque = opaque;
 968     se->vmsd = vmsd;
 969     se->next = NULL;
 970
 971     /* add at the end of list */
 972     pse = &first_se;
 973     while (*pse != NULL) {
 974         if (instance_id == -1
 975                 && strcmp(se->idstr, (*pse)->idstr) == 0
 976                 && se->instance_id <= (*pse)->instance_id)
 977             se->instance_id = (*pse)->instance_id + 1;
 978         pse = &(*pse)->next;
 979     }
 980     *pse = se;
 981     return 0;
 982 }
 983
 984 void vmstate_unregister(const char *idstr,  void *opaque)
 985 {
 986     SaveStateEntry **pse;
 987
 988     pse = &first_se;
 989     while (*pse != NULL) {
 990         if (strcmp((*pse)->idstr, idstr) == 0 && (*pse)->opaque == opaque) {
 991             SaveStateEntry *next = (*pse)->next;
 992             qemu_free(*pse);
 993             *pse = next;
 994             continue;
 995         }
 996         pse = &(*pse)->next;
 997     }
 998 }
 999
1000 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1001                        void *opaque, int version_id)
1002 {
1003     VMStateField *field = vmsd->fields;
1004
1005     if (version_id > vmsd->version_id) {
1006         return -EINVAL;
1007     }
1008     if (version_id < vmsd->minimum_version_id_old) {
1009         return -EINVAL;
1010     }
1011     if  (version_id < vmsd->minimum_version_id) {
1012         return vmsd->load_state_old(f, opaque, version_id);
1013     }
1014     while(field->name) {
1015         if (field->version_id <= version_id) {
1016             void *base_addr = opaque + field->offset;
1017             int ret, i, n_elems = 1;
1018
1019             if (field->flags & VMS_ARRAY) {
1020                 n_elems = field->num;
1021             } else if (field->flags & VMS_VARRAY) {
1022                 n_elems = *(size_t *)(opaque+field->num_offset);
1023             }
1024             if (field->flags & VMS_POINTER) {
1025                 base_addr = *(void **)base_addr;
1026             }
1027             for (i = 0; i < n_elems; i++) {
1028                 void *addr = base_addr + field->size * i;
1029
1030                 if (field->flags & VMS_STRUCT) {
1031                     ret = vmstate_load_state(f, field->vmsd, addr, version_id);
1032                 } else {
1033                     ret = field->info->get(f, addr, field->size);
1034
1035                 }
1036                 if (ret < 0) {
1037                     return ret;
1038                 }
1039             }
1040         }
1041         field++;
1042     }
1043     return 0;
1044 }
1045
1046 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1047                         const void *opaque)
1048 {
1049     VMStateField *field = vmsd->fields;
1050
1051     while(field->name) {
1052         const void *base_addr = opaque + field->offset;
1053         int i, n_elems = 1;
1054
1055         if (field->flags & VMS_ARRAY) {
1056             n_elems = field->num;
1057         } else if (field->flags & VMS_VARRAY) {
1058             n_elems = *(size_t *)(opaque+field->num_offset);
1059         }
1060         if (field->flags & VMS_POINTER) {
1061             base_addr = *(void **)base_addr;
1062         }
1063         for (i = 0; i < n_elems; i++) {
1064             const void *addr = base_addr + field->size * i;
1065
1066             if (field->flags & VMS_STRUCT) {
1067                 vmstate_save_state(f, field->vmsd, addr);
1068             } else {
1069                 field->info->put(f, addr, field->size);
1070             }
1071         }
1072         field++;
1073     }
1074 }
1075
1076 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1077 {
1078     if (!se->vmsd) {         /* Old style */
1079         return se->load_state(f, se->opaque, version_id);
1080     }
1081     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1082 }
1083
1084 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1085 {
1086     if (!se->vmsd) {         /* Old style */
1087         se->save_state(f, se->opaque);
1088         return;
1089     }
1090     vmstate_save_state(f,se->vmsd, se->opaque);
1091 }
1092
1093 #define QEMU_VM_FILE_MAGIC           0x5145564d
1094 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1095 #define QEMU_VM_FILE_VERSION         0x00000003
1096
1097 #define QEMU_VM_EOF                  0x00
1098 #define QEMU_VM_SECTION_START        0x01
1099 #define QEMU_VM_SECTION_PART         0x02
1100 #define QEMU_VM_SECTION_END          0x03
1101 #define QEMU_VM_SECTION_FULL         0x04
1102
1103 int qemu_savevm_state_begin(QEMUFile *f)
1104 {
1105     SaveStateEntry *se;
1106
1107     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1108     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1109
1110     for (se = first_se; se != NULL; se = se->next) {
1111         int len;
1112
1113         if (se->save_live_state == NULL)
1114             continue;
1115
1116         /* Section type */
1117         qemu_put_byte(f, QEMU_VM_SECTION_START);
1118         qemu_put_be32(f, se->section_id);
1119
1120         /* ID string */
1121         len = strlen(se->idstr);
1122         qemu_put_byte(f, len);
1123         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1124
1125         qemu_put_be32(f, se->instance_id);
1126         qemu_put_be32(f, se->version_id);
1127
1128         se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
1129     }
1130
1131     if (qemu_file_has_error(f))
1132         return -EIO;
1133
1134     return 0;
1135 }
1136
1137 int qemu_savevm_state_iterate(QEMUFile *f)
1138 {
1139     SaveStateEntry *se;
1140     int ret = 1;
1141
1142     for (se = first_se; se != NULL; se = se->next) {
1143         if (se->save_live_state == NULL)
1144             continue;
1145
1146         /* Section type */
1147         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1148         qemu_put_be32(f, se->section_id);
1149
1150         ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
1151     }
1152
1153     if (ret)
1154         return 1;
1155
1156     if (qemu_file_has_error(f))
1157         return -EIO;
1158
1159     return 0;
1160 }
1161
1162 int qemu_savevm_state_complete(QEMUFile *f)
1163 {
1164     SaveStateEntry *se;
1165
1166     for (se = first_se; se != NULL; se = se->next) {
1167         if (se->save_live_state == NULL)
1168             continue;
1169
1170         /* Section type */
1171         qemu_put_byte(f, QEMU_VM_SECTION_END);
1172         qemu_put_be32(f, se->section_id);
1173
1174         se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
1175     }
1176
1177     for(se = first_se; se != NULL; se = se->next) {
1178         int len;
1179
1180         if (se->save_state == NULL && se->vmsd == NULL)
1181             continue;
1182
1183         /* Section type */
1184         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1185         qemu_put_be32(f, se->section_id);
1186
1187         /* ID string */
1188         len = strlen(se->idstr);
1189         qemu_put_byte(f, len);
1190         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1191
1192         qemu_put_be32(f, se->instance_id);
1193         qemu_put_be32(f, se->version_id);
1194
1195         vmstate_save(f, se);
1196     }
1197
1198     qemu_put_byte(f, QEMU_VM_EOF);
1199
1200     if (qemu_file_has_error(f))
1201         return -EIO;
1202
1203     return 0;
1204 }
1205
1206 int qemu_savevm_state(QEMUFile *f)
1207 {
1208     int saved_vm_running;
1209     int ret;
1210
1211     saved_vm_running = vm_running;
1212     vm_stop(0);
1213
1214     bdrv_flush_all();
1215
1216     ret = qemu_savevm_state_begin(f);
1217     if (ret < 0)
1218         goto out;
1219
1220     do {
1221         ret = qemu_savevm_state_iterate(f);
1222         if (ret < 0)
1223             goto out;
1224     } while (ret == 0);
1225
1226     ret = qemu_savevm_state_complete(f);
1227
1228 out:
1229     if (qemu_file_has_error(f))
1230         ret = -EIO;
1231
1232     if (!ret && saved_vm_running)
1233         vm_start();
1234
1235     return ret;
1236 }
1237
1238 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1239 {
1240     SaveStateEntry *se;
1241
1242     for(se = first_se; se != NULL; se = se->next) {
1243         if (!strcmp(se->idstr, idstr) &&
1244             instance_id == se->instance_id)
1245             return se;
1246     }
1247     return NULL;
1248 }
1249
1250 typedef struct LoadStateEntry {
1251     SaveStateEntry *se;
1252     int section_id;
1253     int version_id;
1254     struct LoadStateEntry *next;
1255 } LoadStateEntry;
1256
1257 static int qemu_loadvm_state_v2(QEMUFile *f)
1258 {
1259     SaveStateEntry *se;
1260     int len, ret, instance_id, record_len, version_id;
1261     int64_t total_len, end_pos, cur_pos;
1262     char idstr[256];
1263
1264     total_len = qemu_get_be64(f);
1265     end_pos = total_len + qemu_ftell(f);
1266     for(;;) {
1267         if (qemu_ftell(f) >= end_pos)
1268             break;
1269         len = qemu_get_byte(f);
1270         qemu_get_buffer(f, (uint8_t *)idstr, len);
1271         idstr[len] = '\0';
1272         instance_id = qemu_get_be32(f);
1273         version_id = qemu_get_be32(f);
1274         record_len = qemu_get_be32(f);
1275         cur_pos = qemu_ftell(f);
1276         se = find_se(idstr, instance_id);
1277         if (!se) {
1278             fprintf(stderr, "qemu: warning: instance 0x%x of device '%s' not present in current VM\n",
1279                     instance_id, idstr);
1280         } else {
1281             ret = vmstate_load(f, se, version_id);
1282             if (ret < 0) {
1283                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1284                         instance_id, idstr);
1285                 return ret;
1286             }
1287         }
1288         /* always seek to exact end of record */
1289         qemu_fseek(f, cur_pos + record_len, SEEK_SET);
1290     }
1291
1292     if (qemu_file_has_error(f))
1293         return -EIO;
1294
1295     return 0;
1296 }
1297
1298 int qemu_loadvm_state(QEMUFile *f)
1299 {
1300     LoadStateEntry *first_le = NULL;
1301     uint8_t section_type;
1302     unsigned int v;
1303     int ret;
1304
1305     v = qemu_get_be32(f);
1306     if (v != QEMU_VM_FILE_MAGIC)
1307         return -EINVAL;
1308
1309     v = qemu_get_be32(f);
1310     if (v == QEMU_VM_FILE_VERSION_COMPAT)
1311         return qemu_loadvm_state_v2(f);
1312     if (v != QEMU_VM_FILE_VERSION)
1313         return -ENOTSUP;
1314
1315     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1316         uint32_t instance_id, version_id, section_id;
1317         LoadStateEntry *le;
1318         SaveStateEntry *se;
1319         char idstr[257];
1320         int len;
1321
1322         switch (section_type) {
1323         case QEMU_VM_SECTION_START:
1324         case QEMU_VM_SECTION_FULL:
1325             /* Read section start */
1326             section_id = qemu_get_be32(f);
1327             len = qemu_get_byte(f);
1328             qemu_get_buffer(f, (uint8_t *)idstr, len);
1329             idstr[len] = 0;
1330             instance_id = qemu_get_be32(f);
1331             version_id = qemu_get_be32(f);
1332
1333             /* Find savevm section */
1334             se = find_se(idstr, instance_id);
1335             if (se == NULL) {
1336                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1337                 ret = -EINVAL;
1338                 goto out;
1339             }
1340
1341             /* Validate version */
1342             if (version_id > se->version_id) {
1343                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1344                         version_id, idstr, se->version_id);
1345                 ret = -EINVAL;
1346                 goto out;
1347             }
1348
1349             /* Add entry */
1350             le = qemu_mallocz(sizeof(*le));
1351
1352             le->se = se;
1353             le->section_id = section_id;
1354             le->version_id = version_id;
1355             le->next = first_le;
1356             first_le = le;
1357
1358             ret = vmstate_load(f, le->se, le->version_id);
1359             if (ret < 0) {
1360                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1361                         instance_id, idstr);
1362                 goto out;
1363             }
1364             break;
1365         case QEMU_VM_SECTION_PART:
1366         case QEMU_VM_SECTION_END:
1367             section_id = qemu_get_be32(f);
1368
1369             for (le = first_le; le && le->section_id != section_id; le = le->next);
1370             if (le == NULL) {
1371                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1372                 ret = -EINVAL;
1373                 goto out;
1374             }
1375
1376             ret = vmstate_load(f, le->se, le->version_id);
1377             if (ret < 0) {
1378                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1379                         section_id);
1380                 goto out;
1381             }
1382             break;
1383         default:
1384             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1385             ret = -EINVAL;
1386             goto out;
1387         }
1388     }
1389
1390     ret = 0;
1391
1392 out:
1393     while (first_le) {
1394         LoadStateEntry *le = first_le;
1395         first_le = first_le->next;
1396         qemu_free(le);
1397     }
1398
1399     if (qemu_file_has_error(f))
1400         ret = -EIO;
1401
1402     return ret;
1403 }
1404
1405 /* device can contain snapshots */
1406 static int bdrv_can_snapshot(BlockDriverState *bs)
1407 {
1408     return (bs &&
1409             !bdrv_is_removable(bs) &&
1410             !bdrv_is_read_only(bs));
1411 }
1412
1413 /* device must be snapshots in order to have a reliable snapshot */
1414 static int bdrv_has_snapshot(BlockDriverState *bs)
1415 {
1416     return (bs &&
1417             !bdrv_is_removable(bs) &&
1418             !bdrv_is_read_only(bs));
1419 }
1420
1421 static BlockDriverState *get_bs_snapshots(void)
1422 {
1423     BlockDriverState *bs;
1424     DriveInfo *dinfo;
1425
1426     if (bs_snapshots)
1427         return bs_snapshots;
1428     TAILQ_FOREACH(dinfo, &drives, next) {
1429         bs = dinfo->bdrv;
1430         if (bdrv_can_snapshot(bs))
1431             goto ok;
1432     }
1433     return NULL;
1434  ok:
1435     bs_snapshots = bs;
1436     return bs;
1437 }
1438
1439 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1440                               const char *name)
1441 {
1442     QEMUSnapshotInfo *sn_tab, *sn;
1443     int nb_sns, i, ret;
1444
1445     ret = -ENOENT;
1446     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1447     if (nb_sns < 0)
1448         return ret;
1449     for(i = 0; i < nb_sns; i++) {
1450         sn = &sn_tab[i];
1451         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1452             *sn_info = *sn;
1453             ret = 0;
1454             break;
1455         }
1456     }
1457     qemu_free(sn_tab);
1458     return ret;
1459 }
1460
1461 void do_savevm(Monitor *mon, const char *name)
1462 {
1463     DriveInfo *dinfo;
1464     BlockDriverState *bs, *bs1;
1465     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1466     int must_delete, ret;
1467     QEMUFile *f;
1468     int saved_vm_running;
1469     uint32_t vm_state_size;
1470 #ifdef _WIN32
1471     struct _timeb tb;
1472 #else
1473     struct timeval tv;
1474 #endif
1475
1476     bs = get_bs_snapshots();
1477     if (!bs) {
1478         monitor_printf(mon, "No block device can accept snapshots\n");
1479         return;
1480     }
1481
1482     /* ??? Should this occur after vm_stop?  */
1483     qemu_aio_flush();
1484
1485     saved_vm_running = vm_running;
1486     vm_stop(0);
1487
1488     must_delete = 0;
1489     if (name) {
1490         ret = bdrv_snapshot_find(bs, old_sn, name);
1491         if (ret >= 0) {
1492             must_delete = 1;
1493         }
1494     }
1495     memset(sn, 0, sizeof(*sn));
1496     if (must_delete) {
1497         pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1498         pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1499     } else {
1500         if (name)
1501             pstrcpy(sn->name, sizeof(sn->name), name);
1502     }
1503
1504     /* fill auxiliary fields */
1505 #ifdef _WIN32
1506     _ftime(&tb);
1507     sn->date_sec = tb.time;
1508     sn->date_nsec = tb.millitm * 1000000;
1509 #else
1510     gettimeofday(&tv, NULL);
1511     sn->date_sec = tv.tv_sec;
1512     sn->date_nsec = tv.tv_usec * 1000;
1513 #endif
1514     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1515
1516     /* save the VM state */
1517     f = qemu_fopen_bdrv(bs, 1);
1518     if (!f) {
1519         monitor_printf(mon, "Could not open VM state file\n");
1520         goto the_end;
1521     }
1522     ret = qemu_savevm_state(f);
1523     vm_state_size = qemu_ftell(f);
1524     qemu_fclose(f);
1525     if (ret < 0) {
1526         monitor_printf(mon, "Error %d while writing VM\n", ret);
1527         goto the_end;
1528     }
1529
1530     /* create the snapshots */
1531
1532     TAILQ_FOREACH(dinfo, &drives, next) {
1533         bs1 = dinfo->bdrv;
1534         if (bdrv_has_snapshot(bs1)) {
1535             if (must_delete) {
1536                 ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
1537                 if (ret < 0) {
1538                     monitor_printf(mon,
1539                                    "Error while deleting snapshot on '%s'\n",
1540                                    bdrv_get_device_name(bs1));
1541                 }
1542             }
1543             /* Write VM state size only to the image that contains the state */
1544             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1545             ret = bdrv_snapshot_create(bs1, sn);
1546             if (ret < 0) {
1547                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1548                                bdrv_get_device_name(bs1));
1549             }
1550         }
1551     }
1552
1553  the_end:
1554     if (saved_vm_running)
1555         vm_start();
1556 }
1557
1558 int load_vmstate(Monitor *mon, const char *name)
1559 {
1560     DriveInfo *dinfo;
1561     BlockDriverState *bs, *bs1;
1562     QEMUSnapshotInfo sn;
1563     QEMUFile *f;
1564     int ret;
1565
1566     bs = get_bs_snapshots();
1567     if (!bs) {
1568         monitor_printf(mon, "No block device supports snapshots\n");
1569         return -EINVAL;
1570     }
1571
1572     /* Flush all IO requests so they don't interfere with the new state.  */
1573     qemu_aio_flush();
1574
1575     TAILQ_FOREACH(dinfo, &drives, next) {
1576         bs1 = dinfo->bdrv;
1577         if (bdrv_has_snapshot(bs1)) {
1578             ret = bdrv_snapshot_goto(bs1, name);
1579             if (ret < 0) {
1580                 if (bs != bs1)
1581                     monitor_printf(mon, "Warning: ");
1582                 switch(ret) {
1583                 case -ENOTSUP:
1584                     monitor_printf(mon,
1585                                    "Snapshots not supported on device '%s'\n",
1586                                    bdrv_get_device_name(bs1));
1587                     break;
1588                 case -ENOENT:
1589                     monitor_printf(mon, "Could not find snapshot '%s' on "
1590                                    "device '%s'\n",
1591                                    name, bdrv_get_device_name(bs1));
1592                     break;
1593                 default:
1594                     monitor_printf(mon, "Error %d while activating snapshot on"
1595                                    " '%s'\n", ret, bdrv_get_device_name(bs1));
1596                     break;
1597                 }
1598                 /* fatal on snapshot block device */
1599                 if (bs == bs1)
1600                     return 0;
1601             }
1602         }
1603     }
1604
1605     /* Don't even try to load empty VM states */
1606     ret = bdrv_snapshot_find(bs, &sn, name);
1607     if ((ret >= 0) && (sn.vm_state_size == 0))
1608         return -EINVAL;
1609
1610     /* restore the VM state */
1611     f = qemu_fopen_bdrv(bs, 0);
1612     if (!f) {
1613         monitor_printf(mon, "Could not open VM state file\n");
1614         return -EINVAL;
1615     }
1616     ret = qemu_loadvm_state(f);
1617     qemu_fclose(f);
1618     if (ret < 0) {
1619         monitor_printf(mon, "Error %d while loading VM state\n", ret);
1620         return ret;
1621     }
1622     return 0;
1623 }
1624
1625 void do_delvm(Monitor *mon, const char *name)
1626 {
1627     DriveInfo *dinfo;
1628     BlockDriverState *bs, *bs1;
1629     int ret;
1630
1631     bs = get_bs_snapshots();
1632     if (!bs) {
1633         monitor_printf(mon, "No block device supports snapshots\n");
1634         return;
1635     }
1636
1637     TAILQ_FOREACH(dinfo, &drives, next) {
1638         bs1 = dinfo->bdrv;
1639         if (bdrv_has_snapshot(bs1)) {
1640             ret = bdrv_snapshot_delete(bs1, name);
1641             if (ret < 0) {
1642                 if (ret == -ENOTSUP)
1643                     monitor_printf(mon,
1644                                    "Snapshots not supported on device '%s'\n",
1645                                    bdrv_get_device_name(bs1));
1646                 else
1647                     monitor_printf(mon, "Error %d while deleting snapshot on "
1648                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1649             }
1650         }
1651     }
1652 }
1653
1654 void do_info_snapshots(Monitor *mon)
1655 {
1656     DriveInfo *dinfo;
1657     BlockDriverState *bs, *bs1;
1658     QEMUSnapshotInfo *sn_tab, *sn;
1659     int nb_sns, i;
1660     char buf[256];
1661
1662     bs = get_bs_snapshots();
1663     if (!bs) {
1664         monitor_printf(mon, "No available block device supports snapshots\n");
1665         return;
1666     }
1667     monitor_printf(mon, "Snapshot devices:");
1668     TAILQ_FOREACH(dinfo, &drives, next) {
1669         bs1 = dinfo->bdrv;
1670         if (bdrv_has_snapshot(bs1)) {
1671             if (bs == bs1)
1672                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1673         }
1674     }
1675     monitor_printf(mon, "\n");
1676
1677     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1678     if (nb_sns < 0) {
1679         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1680         return;
1681     }
1682     monitor_printf(mon, "Snapshot list (from %s):\n",
1683                    bdrv_get_device_name(bs));
1684     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1685     for(i = 0; i < nb_sns; i++) {
1686         sn = &sn_tab[i];
1687         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1688     }
1689     qemu_free(sn_tab);
1690 }