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 #include "qemu-queue.h"
  94
  95 /* point to the block driver where the snapshots are managed */
  96 static BlockDriverState *bs_snapshots;
  97
  98 #define SELF_ANNOUNCE_ROUNDS 5
  99 #define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */
 100 //#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */
 101 #define EXPERIMENTAL_MAGIC 0xf1f23f4f
 102
 103 static int announce_self_create(uint8_t *buf,
 104                                 uint8_t *mac_addr)
 105 {
 106     uint32_t magic = EXPERIMENTAL_MAGIC;
 107     uint16_t proto = htons(ETH_P_EXPERIMENTAL);
 108
 109     /* FIXME: should we send a different packet (arp/rarp/ping)? */
 110
 111     memset(buf, 0, 64);
 112     memset(buf, 0xff, 6);         /* h_dst */
 113     memcpy(buf + 6, mac_addr, 6); /* h_src */
 114     memcpy(buf + 12, &proto, 2);  /* h_proto */
 115     memcpy(buf + 14, &magic, 4);  /* magic */
 116
 117     return 64; /* len */
 118 }
 119
 120 static void qemu_announce_self_once(void *opaque)
 121 {
 122     int i, len;
 123     VLANState *vlan;
 124     VLANClientState *vc;
 125     uint8_t buf[256];
 126     static int count = SELF_ANNOUNCE_ROUNDS;
 127     QEMUTimer *timer = *(QEMUTimer **)opaque;
 128
 129     for (i = 0; i < MAX_NICS; i++) {
 130         if (!nd_table[i].used)
 131             continue;
 132         len = announce_self_create(buf, nd_table[i].macaddr);
 133         vlan = nd_table[i].vlan;
 134         for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
 135             vc->receive(vc, buf, len);
 136         }
 137     }
 138     if (count--) {
 139             qemu_mod_timer(timer, qemu_get_clock(rt_clock) + 100);
 140     } else {
 141             qemu_del_timer(timer);
 142             qemu_free_timer(timer);
 143     }
 144 }
 145
 146 void qemu_announce_self(void)
 147 {
 148         static QEMUTimer *timer;
 149         timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
 150         qemu_announce_self_once(&timer);
 151 }
 152
 153 /***********************************************************/
 154 /* savevm/loadvm support */
 155
 156 #define IO_BUF_SIZE 32768
 157
 158 struct QEMUFile {
 159     QEMUFilePutBufferFunc *put_buffer;
 160     QEMUFileGetBufferFunc *get_buffer;
 161     QEMUFileCloseFunc *close;
 162     QEMUFileRateLimit *rate_limit;
 163     QEMUFileSetRateLimit *set_rate_limit;
 164     void *opaque;
 165     int is_write;
 166
 167     int64_t buf_offset; /* start of buffer when writing, end of buffer
 168                            when reading */
 169     int buf_index;
 170     int buf_size; /* 0 when writing */
 171     uint8_t buf[IO_BUF_SIZE];
 172
 173     int has_error;
 174 };
 175
 176 typedef struct QEMUFileStdio
 177 {
 178     FILE *stdio_file;
 179     QEMUFile *file;
 180 } QEMUFileStdio;
 181
 182 typedef struct QEMUFileSocket
 183 {
 184     int fd;
 185     QEMUFile *file;
 186 } QEMUFileSocket;
 187
 188 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 189 {
 190     QEMUFileSocket *s = opaque;
 191     ssize_t len;
 192
 193     do {
 194         len = recv(s->fd, (void *)buf, size, 0);
 195     } while (len == -1 && socket_error() == EINTR);
 196
 197     if (len == -1)
 198         len = -socket_error();
 199
 200     return len;
 201 }
 202
 203 static int socket_close(void *opaque)
 204 {
 205     QEMUFileSocket *s = opaque;
 206     qemu_free(s);
 207     return 0;
 208 }
 209
 210 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 211 {
 212     QEMUFileStdio *s = opaque;
 213     return fwrite(buf, 1, size, s->stdio_file);
 214 }
 215
 216 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 217 {
 218     QEMUFileStdio *s = opaque;
 219     FILE *fp = s->stdio_file;
 220     int bytes;
 221
 222     do {
 223         clearerr(fp);
 224         bytes = fread(buf, 1, size, fp);
 225     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 226     return bytes;
 227 }
 228
 229 static int stdio_pclose(void *opaque)
 230 {
 231     QEMUFileStdio *s = opaque;
 232     pclose(s->stdio_file);
 233     qemu_free(s);
 234     return 0;
 235 }
 236
 237 static int stdio_fclose(void *opaque)
 238 {
 239     QEMUFileStdio *s = opaque;
 240     fclose(s->stdio_file);
 241     qemu_free(s);
 242     return 0;
 243 }
 244
 245 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 246 {
 247     QEMUFileStdio *s;
 248
 249     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 250         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 251         return NULL;
 252     }
 253
 254     s = qemu_mallocz(sizeof(QEMUFileStdio));
 255
 256     s->stdio_file = stdio_file;
 257
 258     if(mode[0] == 'r') {
 259         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, NULL, NULL);
 260     } else {
 261         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, NULL, NULL);
 262     }
 263     return s->file;
 264 }
 265
 266 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 267 {
 268     FILE *popen_file;
 269
 270     popen_file = popen(command, mode);
 271     if(popen_file == NULL) {
 272         return NULL;
 273     }
 274
 275     return qemu_popen(popen_file, mode);
 276 }
 277
 278 int qemu_stdio_fd(QEMUFile *f)
 279 {
 280     QEMUFileStdio *p;
 281     int fd;
 282
 283     p = (QEMUFileStdio *)f->opaque;
 284     fd = fileno(p->stdio_file);
 285
 286     return fd;
 287 }
 288
 289 QEMUFile *qemu_fdopen(int fd, const char *mode)
 290 {
 291     QEMUFileStdio *s;
 292
 293     if (mode == NULL ||
 294         (mode[0] != 'r' && mode[0] != 'w') ||
 295         mode[1] != 'b' || mode[2] != 0) {
 296         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 297         return NULL;
 298     }
 299
 300     s = qemu_mallocz(sizeof(QEMUFileStdio));
 301     s->stdio_file = fdopen(fd, mode);
 302     if (!s->stdio_file)
 303         goto fail;
 304
 305     if(mode[0] == 'r') {
 306         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose, NULL, NULL);
 307     } else {
 308         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, NULL, NULL);
 309     }
 310     return s->file;
 311
 312 fail:
 313     qemu_free(s);
 314     return NULL;
 315 }
 316
 317 QEMUFile *qemu_fopen_socket(int fd)
 318 {
 319     QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 320
 321     s->fd = fd;
 322     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, NULL, NULL);
 323     return s->file;
 324 }
 325
 326 static int file_put_buffer(void *opaque, const uint8_t *buf,
 327                             int64_t pos, int size)
 328 {
 329     QEMUFileStdio *s = opaque;
 330     fseek(s->stdio_file, pos, SEEK_SET);
 331     fwrite(buf, 1, size, s->stdio_file);
 332     return size;
 333 }
 334
 335 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 336 {
 337     QEMUFileStdio *s = opaque;
 338     fseek(s->stdio_file, pos, SEEK_SET);
 339     return fread(buf, 1, size, s->stdio_file);
 340 }
 341
 342 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 343 {
 344     QEMUFileStdio *s;
 345
 346     if (mode == NULL ||
 347         (mode[0] != 'r' && mode[0] != 'w') ||
 348         mode[1] != 'b' || mode[2] != 0) {
 349         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 350         return NULL;
 351     }
 352
 353     s = qemu_mallocz(sizeof(QEMUFileStdio));
 354
 355     s->stdio_file = fopen(filename, mode);
 356     if (!s->stdio_file)
 357         goto fail;
 358
 359     if(mode[0] == 'w') {
 360         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose, NULL, NULL);
 361     } else {
 362         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, NULL, NULL);
 363     }
 364     return s->file;
 365 fail:
 366     qemu_free(s);
 367     return NULL;
 368 }
 369
 370 static int block_put_buffer(void *opaque, const uint8_t *buf,
 371                            int64_t pos, int size)
 372 {
 373     bdrv_save_vmstate(opaque, buf, pos, size);
 374     return size;
 375 }
 376
 377 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 378 {
 379     return bdrv_load_vmstate(opaque, buf, pos, size);
 380 }
 381
 382 static int bdrv_fclose(void *opaque)
 383 {
 384     return 0;
 385 }
 386
 387 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 388 {
 389     if (is_writable)
 390         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, NULL, NULL);
 391     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL);
 392 }
 393
 394 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 395                          QEMUFileGetBufferFunc *get_buffer,
 396                          QEMUFileCloseFunc *close,
 397                          QEMUFileRateLimit *rate_limit,
 398                          QEMUFileSetRateLimit *set_rate_limit)
 399 {
 400     QEMUFile *f;
 401
 402     f = qemu_mallocz(sizeof(QEMUFile));
 403
 404     f->opaque = opaque;
 405     f->put_buffer = put_buffer;
 406     f->get_buffer = get_buffer;
 407     f->close = close;
 408     f->rate_limit = rate_limit;
 409     f->set_rate_limit = set_rate_limit;
 410     f->is_write = 0;
 411
 412     return f;
 413 }
 414
 415 int qemu_file_has_error(QEMUFile *f)
 416 {
 417     return f->has_error;
 418 }
 419
 420 void qemu_file_set_error(QEMUFile *f)
 421 {
 422     f->has_error = 1;
 423 }
 424
 425 void qemu_fflush(QEMUFile *f)
 426 {
 427     if (!f->put_buffer)
 428         return;
 429
 430     if (f->is_write && f->buf_index > 0) {
 431         int len;
 432
 433         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 434         if (len > 0)
 435             f->buf_offset += f->buf_index;
 436         else
 437             f->has_error = 1;
 438         f->buf_index = 0;
 439     }
 440 }
 441
 442 static void qemu_fill_buffer(QEMUFile *f)
 443 {
 444     int len;
 445
 446     if (!f->get_buffer)
 447         return;
 448
 449     if (f->is_write)
 450         abort();
 451
 452     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 453     if (len > 0) {
 454         f->buf_index = 0;
 455         f->buf_size = len;
 456         f->buf_offset += len;
 457     } else if (len != -EAGAIN)
 458         f->has_error = 1;
 459 }
 460
 461 int qemu_fclose(QEMUFile *f)
 462 {
 463     int ret = 0;
 464     qemu_fflush(f);
 465     if (f->close)
 466         ret = f->close(f->opaque);
 467     qemu_free(f);
 468     return ret;
 469 }
 470
 471 void qemu_file_put_notify(QEMUFile *f)
 472 {
 473     f->put_buffer(f->opaque, NULL, 0, 0);
 474 }
 475
 476 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 477 {
 478     int l;
 479
 480     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 481         fprintf(stderr,
 482                 "Attempted to write to buffer while read buffer is not empty\n");
 483         abort();
 484     }
 485
 486     while (!f->has_error && size > 0) {
 487         l = IO_BUF_SIZE - f->buf_index;
 488         if (l > size)
 489             l = size;
 490         memcpy(f->buf + f->buf_index, buf, l);
 491         f->is_write = 1;
 492         f->buf_index += l;
 493         buf += l;
 494         size -= l;
 495         if (f->buf_index >= IO_BUF_SIZE)
 496             qemu_fflush(f);
 497     }
 498 }
 499
 500 void qemu_put_byte(QEMUFile *f, int v)
 501 {
 502     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 503         fprintf(stderr,
 504                 "Attempted to write to buffer while read buffer is not empty\n");
 505         abort();
 506     }
 507
 508     f->buf[f->buf_index++] = v;
 509     f->is_write = 1;
 510     if (f->buf_index >= IO_BUF_SIZE)
 511         qemu_fflush(f);
 512 }
 513
 514 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 515 {
 516     int size, l;
 517
 518     if (f->is_write)
 519         abort();
 520
 521     size = size1;
 522     while (size > 0) {
 523         l = f->buf_size - f->buf_index;
 524         if (l == 0) {
 525             qemu_fill_buffer(f);
 526             l = f->buf_size - f->buf_index;
 527             if (l == 0)
 528                 break;
 529         }
 530         if (l > size)
 531             l = size;
 532         memcpy(buf, f->buf + f->buf_index, l);
 533         f->buf_index += l;
 534         buf += l;
 535         size -= l;
 536     }
 537     return size1 - size;
 538 }
 539
 540 int qemu_get_byte(QEMUFile *f)
 541 {
 542     if (f->is_write)
 543         abort();
 544
 545     if (f->buf_index >= f->buf_size) {
 546         qemu_fill_buffer(f);
 547         if (f->buf_index >= f->buf_size)
 548             return 0;
 549     }
 550     return f->buf[f->buf_index++];
 551 }
 552
 553 int64_t qemu_ftell(QEMUFile *f)
 554 {
 555     return f->buf_offset - f->buf_size + f->buf_index;
 556 }
 557
 558 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 559 {
 560     if (whence == SEEK_SET) {
 561         /* nothing to do */
 562     } else if (whence == SEEK_CUR) {
 563         pos += qemu_ftell(f);
 564     } else {
 565         /* SEEK_END not supported */
 566         return -1;
 567     }
 568     if (f->put_buffer) {
 569         qemu_fflush(f);
 570         f->buf_offset = pos;
 571     } else {
 572         f->buf_offset = pos;
 573         f->buf_index = 0;
 574         f->buf_size = 0;
 575     }
 576     return pos;
 577 }
 578
 579 int qemu_file_rate_limit(QEMUFile *f)
 580 {
 581     if (f->rate_limit)
 582         return f->rate_limit(f->opaque);
 583
 584     return 0;
 585 }
 586
 587 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
 588 {
 589     /* any failed or completed migration keeps its state to allow probing of
 590      * migration data, but has no associated file anymore */
 591     if (f && f->set_rate_limit)
 592         return f->set_rate_limit(f->opaque, new_rate);
 593
 594     return 0;
 595 }
 596
 597 void qemu_put_be16(QEMUFile *f, unsigned int v)
 598 {
 599     qemu_put_byte(f, v >> 8);
 600     qemu_put_byte(f, v);
 601 }
 602
 603 void qemu_put_be32(QEMUFile *f, unsigned int v)
 604 {
 605     qemu_put_byte(f, v >> 24);
 606     qemu_put_byte(f, v >> 16);
 607     qemu_put_byte(f, v >> 8);
 608     qemu_put_byte(f, v);
 609 }
 610
 611 void qemu_put_be64(QEMUFile *f, uint64_t v)
 612 {
 613     qemu_put_be32(f, v >> 32);
 614     qemu_put_be32(f, v);
 615 }
 616
 617 unsigned int qemu_get_be16(QEMUFile *f)
 618 {
 619     unsigned int v;
 620     v = qemu_get_byte(f) << 8;
 621     v |= qemu_get_byte(f);
 622     return v;
 623 }
 624
 625 unsigned int qemu_get_be32(QEMUFile *f)
 626 {
 627     unsigned int v;
 628     v = qemu_get_byte(f) << 24;
 629     v |= qemu_get_byte(f) << 16;
 630     v |= qemu_get_byte(f) << 8;
 631     v |= qemu_get_byte(f);
 632     return v;
 633 }
 634
 635 uint64_t qemu_get_be64(QEMUFile *f)
 636 {
 637     uint64_t v;
 638     v = (uint64_t)qemu_get_be32(f) << 32;
 639     v |= qemu_get_be32(f);
 640     return v;
 641 }
 642
 643 /* 8 bit int */
 644
 645 static int get_int8(QEMUFile *f, void *pv, size_t size)
 646 {
 647     int8_t *v = pv;
 648     qemu_get_s8s(f, v);
 649     return 0;
 650 }
 651
 652 static void put_int8(QEMUFile *f, const void *pv, size_t size)
 653 {
 654     const int8_t *v = pv;
 655     qemu_put_s8s(f, v);
 656 }
 657
 658 const VMStateInfo vmstate_info_int8 = {
 659     .name = "int8",
 660     .get  = get_int8,
 661     .put  = put_int8,
 662 };
 663
 664 /* 16 bit int */
 665
 666 static int get_int16(QEMUFile *f, void *pv, size_t size)
 667 {
 668     int16_t *v = pv;
 669     qemu_get_sbe16s(f, v);
 670     return 0;
 671 }
 672
 673 static void put_int16(QEMUFile *f, const void *pv, size_t size)
 674 {
 675     const int16_t *v = pv;
 676     qemu_put_sbe16s(f, v);
 677 }
 678
 679 const VMStateInfo vmstate_info_int16 = {
 680     .name = "int16",
 681     .get  = get_int16,
 682     .put  = put_int16,
 683 };
 684
 685 /* 32 bit int */
 686
 687 static int get_int32(QEMUFile *f, void *pv, size_t size)
 688 {
 689     int32_t *v = pv;
 690     qemu_get_sbe32s(f, v);
 691     return 0;
 692 }
 693
 694 static void put_int32(QEMUFile *f, const void *pv, size_t size)
 695 {
 696     const int32_t *v = pv;
 697     qemu_put_sbe32s(f, v);
 698 }
 699
 700 const VMStateInfo vmstate_info_int32 = {
 701     .name = "int32",
 702     .get  = get_int32,
 703     .put  = put_int32,
 704 };
 705
 706 /* 32 bit int. See that the received value is the same than the one
 707    in the field */
 708
 709 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 710 {
 711     int32_t *v = pv;
 712     int32_t v2;
 713     qemu_get_sbe32s(f, &v2);
 714
 715     if (*v == v2)
 716         return 0;
 717     return -EINVAL;
 718 }
 719
 720 const VMStateInfo vmstate_info_int32_equal = {
 721     .name = "int32 equal",
 722     .get  = get_int32_equal,
 723     .put  = put_int32,
 724 };
 725
 726 /* 32 bit int. See that the received value is the less or the same
 727    than the one in the field */
 728
 729 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 730 {
 731     int32_t *old = pv;
 732     int32_t new;
 733     qemu_get_sbe32s(f, &new);
 734
 735     if (*old <= new)
 736         return 0;
 737     return -EINVAL;
 738 }
 739
 740 const VMStateInfo vmstate_info_int32_le = {
 741     .name = "int32 equal",
 742     .get  = get_int32_le,
 743     .put  = put_int32,
 744 };
 745
 746 /* 64 bit int */
 747
 748 static int get_int64(QEMUFile *f, void *pv, size_t size)
 749 {
 750     int64_t *v = pv;
 751     qemu_get_sbe64s(f, v);
 752     return 0;
 753 }
 754
 755 static void put_int64(QEMUFile *f, const void *pv, size_t size)
 756 {
 757     const int64_t *v = pv;
 758     qemu_put_sbe64s(f, v);
 759 }
 760
 761 const VMStateInfo vmstate_info_int64 = {
 762     .name = "int64",
 763     .get  = get_int64,
 764     .put  = put_int64,
 765 };
 766
 767 /* 8 bit unsigned int */
 768
 769 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 770 {
 771     uint8_t *v = pv;
 772     qemu_get_8s(f, v);
 773     return 0;
 774 }
 775
 776 static void put_uint8(QEMUFile *f, const void *pv, size_t size)
 777 {
 778     const uint8_t *v = pv;
 779     qemu_put_8s(f, v);
 780 }
 781
 782 const VMStateInfo vmstate_info_uint8 = {
 783     .name = "uint8",
 784     .get  = get_uint8,
 785     .put  = put_uint8,
 786 };
 787
 788 /* 16 bit unsigned int */
 789
 790 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 791 {
 792     uint16_t *v = pv;
 793     qemu_get_be16s(f, v);
 794     return 0;
 795 }
 796
 797 static void put_uint16(QEMUFile *f, const void *pv, size_t size)
 798 {
 799     const uint16_t *v = pv;
 800     qemu_put_be16s(f, v);
 801 }
 802
 803 const VMStateInfo vmstate_info_uint16 = {
 804     .name = "uint16",
 805     .get  = get_uint16,
 806     .put  = put_uint16,
 807 };
 808
 809 /* 32 bit unsigned int */
 810
 811 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 812 {
 813     uint32_t *v = pv;
 814     qemu_get_be32s(f, v);
 815     return 0;
 816 }
 817
 818 static void put_uint32(QEMUFile *f, const void *pv, size_t size)
 819 {
 820     const uint32_t *v = pv;
 821     qemu_put_be32s(f, v);
 822 }
 823
 824 const VMStateInfo vmstate_info_uint32 = {
 825     .name = "uint32",
 826     .get  = get_uint32,
 827     .put  = put_uint32,
 828 };
 829
 830 /* 64 bit unsigned int */
 831
 832 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 833 {
 834     uint64_t *v = pv;
 835     qemu_get_be64s(f, v);
 836     return 0;
 837 }
 838
 839 static void put_uint64(QEMUFile *f, const void *pv, size_t size)
 840 {
 841     const uint64_t *v = pv;
 842     qemu_put_be64s(f, v);
 843 }
 844
 845 const VMStateInfo vmstate_info_uint64 = {
 846     .name = "uint64",
 847     .get  = get_uint64,
 848     .put  = put_uint64,
 849 };
 850
 851 /* 8 bit int. See that the received value is the same than the one
 852    in the field */
 853
 854 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 855 {
 856     uint8_t *v = pv;
 857     uint8_t v2;
 858     qemu_get_8s(f, &v2);
 859
 860     if (*v == v2)
 861         return 0;
 862     return -EINVAL;
 863 }
 864
 865 const VMStateInfo vmstate_info_uint8_equal = {
 866     .name = "int32 equal",
 867     .get  = get_uint8_equal,
 868     .put  = put_uint8,
 869 };
 870
 871 /* timers  */
 872
 873 static int get_timer(QEMUFile *f, void *pv, size_t size)
 874 {
 875     QEMUTimer *v = pv;
 876     qemu_get_timer(f, v);
 877     return 0;
 878 }
 879
 880 static void put_timer(QEMUFile *f, const void *pv, size_t size)
 881 {
 882     QEMUTimer *v = (void *)pv;
 883     qemu_put_timer(f, v);
 884 }
 885
 886 const VMStateInfo vmstate_info_timer = {
 887     .name = "timer",
 888     .get  = get_timer,
 889     .put  = put_timer,
 890 };
 891
 892 /* uint8_t buffers */
 893
 894 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 895 {
 896     uint8_t *v = pv;
 897     qemu_get_buffer(f, v, size);
 898     return 0;
 899 }
 900
 901 static void put_buffer(QEMUFile *f, const void *pv, size_t size)
 902 {
 903     uint8_t *v = (void *)pv;
 904     qemu_put_buffer(f, v, size);
 905 }
 906
 907 const VMStateInfo vmstate_info_buffer = {
 908     .name = "buffer",
 909     .get  = get_buffer,
 910     .put  = put_buffer,
 911 };
 912
 913 typedef struct SaveStateEntry {
 914     QTAILQ_ENTRY(SaveStateEntry) entry;
 915     char idstr[256];
 916     int instance_id;
 917     int version_id;
 918     int section_id;
 919     SaveLiveStateHandler *save_live_state;
 920     SaveStateHandler *save_state;
 921     LoadStateHandler *load_state;
 922     const VMStateDescription *vmsd;
 923     void *opaque;
 924 } SaveStateEntry;
 925
 926 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
 927     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
 928 static int global_section_id;
 929
 930 static int calculate_new_instance_id(const char *idstr)
 931 {
 932     SaveStateEntry *se;
 933     int instance_id = 0;
 934
 935     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 936         if (strcmp(idstr, se->idstr) == 0
 937             && instance_id <= se->instance_id) {
 938             instance_id = se->instance_id + 1;
 939         }
 940     }
 941     return instance_id;
 942 }
 943
 944 /* TODO: Individual devices generally have very little idea about the rest
 945    of the system, so instance_id should be removed/replaced.
 946    Meanwhile pass -1 as instance_id if you do not already have a clearly
 947    distinguishing id for all instances of your device class. */
 948 int register_savevm_live(const char *idstr,
 949                          int instance_id,
 950                          int version_id,
 951                          SaveLiveStateHandler *save_live_state,
 952                          SaveStateHandler *save_state,
 953                          LoadStateHandler *load_state,
 954                          void *opaque)
 955 {
 956     SaveStateEntry *se;
 957
 958     se = qemu_malloc(sizeof(SaveStateEntry));
 959     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
 960     se->version_id = version_id;
 961     se->section_id = global_section_id++;
 962     se->save_live_state = save_live_state;
 963     se->save_state = save_state;
 964     se->load_state = load_state;
 965     se->opaque = opaque;
 966     se->vmsd = NULL;
 967
 968     if (instance_id == -1) {
 969         se->instance_id = calculate_new_instance_id(idstr);
 970     } else {
 971         se->instance_id = instance_id;
 972     }
 973     /* add at the end of list */
 974     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
 975     return 0;
 976 }
 977
 978 int register_savevm(const char *idstr,
 979                     int instance_id,
 980                     int version_id,
 981                     SaveStateHandler *save_state,
 982                     LoadStateHandler *load_state,
 983                     void *opaque)
 984 {
 985     return register_savevm_live(idstr, instance_id, version_id,
 986                                 NULL, save_state, load_state, opaque);
 987 }
 988
 989 void unregister_savevm(const char *idstr, void *opaque)
 990 {
 991     SaveStateEntry *se, *new_se;
 992
 993     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
 994         if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
 995             QTAILQ_REMOVE(&savevm_handlers, se, entry);
 996             qemu_free(se);
 997         }
 998     }
 999 }
1000
1001 int vmstate_register(int instance_id, const VMStateDescription *vmsd,
1002                      void *opaque)
1003 {
1004     SaveStateEntry *se;
1005
1006     se = qemu_malloc(sizeof(SaveStateEntry));
1007     pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
1008     se->version_id = vmsd->version_id;
1009     se->section_id = global_section_id++;
1010     se->save_live_state = NULL;
1011     se->save_state = NULL;
1012     se->load_state = NULL;
1013     se->opaque = opaque;
1014     se->vmsd = vmsd;
1015
1016     if (instance_id == -1) {
1017         se->instance_id = calculate_new_instance_id(vmsd->name);
1018     } else {
1019         se->instance_id = instance_id;
1020     }
1021     /* add at the end of list */
1022     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1023     return 0;
1024 }
1025
1026 void vmstate_unregister(const VMStateDescription *vmsd, void *opaque)
1027 {
1028     SaveStateEntry *se, *new_se;
1029
1030     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1031         if (se->vmsd == vmsd && se->opaque == opaque) {
1032             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1033             qemu_free(se);
1034         }
1035     }
1036 }
1037
1038 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1039                        void *opaque, int version_id)
1040 {
1041     VMStateField *field = vmsd->fields;
1042
1043     if (version_id > vmsd->version_id) {
1044         return -EINVAL;
1045     }
1046     if (version_id < vmsd->minimum_version_id_old) {
1047         return -EINVAL;
1048     }
1049     if  (version_id < vmsd->minimum_version_id) {
1050         return vmsd->load_state_old(f, opaque, version_id);
1051     }
1052     if (vmsd->pre_load) {
1053         int ret = vmsd->pre_load(opaque);
1054         if (ret)
1055             return ret;
1056     }
1057     while(field->name) {
1058         if (field->version_id <= version_id) {
1059             void *base_addr = opaque + field->offset;
1060             int ret, i, n_elems = 1;
1061
1062             if (field->flags & VMS_ARRAY) {
1063                 n_elems = field->num;
1064             } else if (field->flags & VMS_VARRAY) {
1065                 n_elems = *(size_t *)(opaque+field->num_offset);
1066             }
1067             if (field->flags & VMS_POINTER) {
1068                 base_addr = *(void **)base_addr;
1069             }
1070             for (i = 0; i < n_elems; i++) {
1071                 void *addr = base_addr + field->size * i;
1072
1073                 if (field->flags & VMS_STRUCT) {
1074                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1075                 } else {
1076                     ret = field->info->get(f, addr, field->size);
1077
1078                 }
1079                 if (ret < 0) {
1080                     return ret;
1081                 }
1082             }
1083         }
1084         field++;
1085     }
1086     if (vmsd->post_load) {
1087         return vmsd->post_load(opaque);
1088     }
1089     return 0;
1090 }
1091
1092 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1093                         const void *opaque)
1094 {
1095     VMStateField *field = vmsd->fields;
1096
1097     if (vmsd->pre_save) {
1098         vmsd->pre_save(opaque);
1099     }
1100     while(field->name) {
1101         const void *base_addr = opaque + field->offset;
1102         int i, n_elems = 1;
1103
1104         if (field->flags & VMS_ARRAY) {
1105             n_elems = field->num;
1106         } else if (field->flags & VMS_VARRAY) {
1107             n_elems = *(size_t *)(opaque+field->num_offset);
1108         }
1109         if (field->flags & VMS_POINTER) {
1110             base_addr = *(void **)base_addr;
1111         }
1112         for (i = 0; i < n_elems; i++) {
1113             const void *addr = base_addr + field->size * i;
1114
1115             if (field->flags & VMS_STRUCT) {
1116                 vmstate_save_state(f, field->vmsd, addr);
1117             } else {
1118                 field->info->put(f, addr, field->size);
1119             }
1120         }
1121         field++;
1122     }
1123     if (vmsd->post_save) {
1124         vmsd->post_save(opaque);
1125     }
1126 }
1127
1128 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1129 {
1130     if (!se->vmsd) {         /* Old style */
1131         return se->load_state(f, se->opaque, version_id);
1132     }
1133     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1134 }
1135
1136 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1137 {
1138     if (!se->vmsd) {         /* Old style */
1139         se->save_state(f, se->opaque);
1140         return;
1141     }
1142     vmstate_save_state(f,se->vmsd, se->opaque);
1143 }
1144
1145 #define QEMU_VM_FILE_MAGIC           0x5145564d
1146 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1147 #define QEMU_VM_FILE_VERSION         0x00000003
1148
1149 #define QEMU_VM_EOF                  0x00
1150 #define QEMU_VM_SECTION_START        0x01
1151 #define QEMU_VM_SECTION_PART         0x02
1152 #define QEMU_VM_SECTION_END          0x03
1153 #define QEMU_VM_SECTION_FULL         0x04
1154
1155 int qemu_savevm_state_begin(QEMUFile *f)
1156 {
1157     SaveStateEntry *se;
1158
1159     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1160     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1161
1162     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1163         int len;
1164
1165         if (se->save_live_state == NULL)
1166             continue;
1167
1168         /* Section type */
1169         qemu_put_byte(f, QEMU_VM_SECTION_START);
1170         qemu_put_be32(f, se->section_id);
1171
1172         /* ID string */
1173         len = strlen(se->idstr);
1174         qemu_put_byte(f, len);
1175         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1176
1177         qemu_put_be32(f, se->instance_id);
1178         qemu_put_be32(f, se->version_id);
1179
1180         se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
1181     }
1182
1183     if (qemu_file_has_error(f))
1184         return -EIO;
1185
1186     return 0;
1187 }
1188
1189 int qemu_savevm_state_iterate(QEMUFile *f)
1190 {
1191     SaveStateEntry *se;
1192     int ret = 1;
1193
1194     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1195         if (se->save_live_state == NULL)
1196             continue;
1197
1198         /* Section type */
1199         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1200         qemu_put_be32(f, se->section_id);
1201
1202         ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
1203     }
1204
1205     if (ret)
1206         return 1;
1207
1208     if (qemu_file_has_error(f))
1209         return -EIO;
1210
1211     return 0;
1212 }
1213
1214 int qemu_savevm_state_complete(QEMUFile *f)
1215 {
1216     SaveStateEntry *se;
1217
1218     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1219         if (se->save_live_state == NULL)
1220             continue;
1221
1222         /* Section type */
1223         qemu_put_byte(f, QEMU_VM_SECTION_END);
1224         qemu_put_be32(f, se->section_id);
1225
1226         se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
1227     }
1228
1229     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1230         int len;
1231
1232         if (se->save_state == NULL && se->vmsd == NULL)
1233             continue;
1234
1235         /* Section type */
1236         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1237         qemu_put_be32(f, se->section_id);
1238
1239         /* ID string */
1240         len = strlen(se->idstr);
1241         qemu_put_byte(f, len);
1242         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1243
1244         qemu_put_be32(f, se->instance_id);
1245         qemu_put_be32(f, se->version_id);
1246
1247         vmstate_save(f, se);
1248     }
1249
1250     qemu_put_byte(f, QEMU_VM_EOF);
1251
1252     if (qemu_file_has_error(f))
1253         return -EIO;
1254
1255     return 0;
1256 }
1257
1258 int qemu_savevm_state(QEMUFile *f)
1259 {
1260     int saved_vm_running;
1261     int ret;
1262
1263     saved_vm_running = vm_running;
1264     vm_stop(0);
1265
1266     bdrv_flush_all();
1267
1268     ret = qemu_savevm_state_begin(f);
1269     if (ret < 0)
1270         goto out;
1271
1272     do {
1273         ret = qemu_savevm_state_iterate(f);
1274         if (ret < 0)
1275             goto out;
1276     } while (ret == 0);
1277
1278     ret = qemu_savevm_state_complete(f);
1279
1280 out:
1281     if (qemu_file_has_error(f))
1282         ret = -EIO;
1283
1284     if (!ret && saved_vm_running)
1285         vm_start();
1286
1287     return ret;
1288 }
1289
1290 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1291 {
1292     SaveStateEntry *se;
1293
1294     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1295         if (!strcmp(se->idstr, idstr) &&
1296             instance_id == se->instance_id)
1297             return se;
1298     }
1299     return NULL;
1300 }
1301
1302 typedef struct LoadStateEntry {
1303     QLIST_ENTRY(LoadStateEntry) entry;
1304     SaveStateEntry *se;
1305     int section_id;
1306     int version_id;
1307 } LoadStateEntry;
1308
1309 int qemu_loadvm_state(QEMUFile *f)
1310 {
1311     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1312         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1313     LoadStateEntry *le, *new_le;
1314     uint8_t section_type;
1315     unsigned int v;
1316     int ret;
1317
1318     v = qemu_get_be32(f);
1319     if (v != QEMU_VM_FILE_MAGIC)
1320         return -EINVAL;
1321
1322     v = qemu_get_be32(f);
1323     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1324         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1325         return -ENOTSUP;
1326     }
1327     if (v != QEMU_VM_FILE_VERSION)
1328         return -ENOTSUP;
1329
1330     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1331         uint32_t instance_id, version_id, section_id;
1332         SaveStateEntry *se;
1333         char idstr[257];
1334         int len;
1335
1336         switch (section_type) {
1337         case QEMU_VM_SECTION_START:
1338         case QEMU_VM_SECTION_FULL:
1339             /* Read section start */
1340             section_id = qemu_get_be32(f);
1341             len = qemu_get_byte(f);
1342             qemu_get_buffer(f, (uint8_t *)idstr, len);
1343             idstr[len] = 0;
1344             instance_id = qemu_get_be32(f);
1345             version_id = qemu_get_be32(f);
1346
1347             /* Find savevm section */
1348             se = find_se(idstr, instance_id);
1349             if (se == NULL) {
1350                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1351                 ret = -EINVAL;
1352                 goto out;
1353             }
1354
1355             /* Validate version */
1356             if (version_id > se->version_id) {
1357                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1358                         version_id, idstr, se->version_id);
1359                 ret = -EINVAL;
1360                 goto out;
1361             }
1362
1363             /* Add entry */
1364             le = qemu_mallocz(sizeof(*le));
1365
1366             le->se = se;
1367             le->section_id = section_id;
1368             le->version_id = version_id;
1369             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1370
1371             ret = vmstate_load(f, le->se, le->version_id);
1372             if (ret < 0) {
1373                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1374                         instance_id, idstr);
1375                 goto out;
1376             }
1377             break;
1378         case QEMU_VM_SECTION_PART:
1379         case QEMU_VM_SECTION_END:
1380             section_id = qemu_get_be32(f);
1381
1382             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1383                 if (le->section_id == section_id) {
1384                     break;
1385                 }
1386             }
1387             if (le == NULL) {
1388                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1389                 ret = -EINVAL;
1390                 goto out;
1391             }
1392
1393             ret = vmstate_load(f, le->se, le->version_id);
1394             if (ret < 0) {
1395                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1396                         section_id);
1397                 goto out;
1398             }
1399             break;
1400         default:
1401             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1402             ret = -EINVAL;
1403             goto out;
1404         }
1405     }
1406
1407     ret = 0;
1408
1409 out:
1410     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1411         QLIST_REMOVE(le, entry);
1412         qemu_free(le);
1413     }
1414
1415     if (qemu_file_has_error(f))
1416         ret = -EIO;
1417
1418     return ret;
1419 }
1420
1421 /* device can contain snapshots */
1422 static int bdrv_can_snapshot(BlockDriverState *bs)
1423 {
1424     return (bs &&
1425             !bdrv_is_removable(bs) &&
1426             !bdrv_is_read_only(bs));
1427 }
1428
1429 /* device must be snapshots in order to have a reliable snapshot */
1430 static int bdrv_has_snapshot(BlockDriverState *bs)
1431 {
1432     return (bs &&
1433             !bdrv_is_removable(bs) &&
1434             !bdrv_is_read_only(bs));
1435 }
1436
1437 static BlockDriverState *get_bs_snapshots(void)
1438 {
1439     BlockDriverState *bs;
1440     DriveInfo *dinfo;
1441
1442     if (bs_snapshots)
1443         return bs_snapshots;
1444     QTAILQ_FOREACH(dinfo, &drives, next) {
1445         bs = dinfo->bdrv;
1446         if (bdrv_can_snapshot(bs))
1447             goto ok;
1448     }
1449     return NULL;
1450  ok:
1451     bs_snapshots = bs;
1452     return bs;
1453 }
1454
1455 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1456                               const char *name)
1457 {
1458     QEMUSnapshotInfo *sn_tab, *sn;
1459     int nb_sns, i, ret;
1460
1461     ret = -ENOENT;
1462     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1463     if (nb_sns < 0)
1464         return ret;
1465     for(i = 0; i < nb_sns; i++) {
1466         sn = &sn_tab[i];
1467         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1468             *sn_info = *sn;
1469             ret = 0;
1470             break;
1471         }
1472     }
1473     qemu_free(sn_tab);
1474     return ret;
1475 }
1476
1477 void do_savevm(Monitor *mon, const QDict *qdict)
1478 {
1479     DriveInfo *dinfo;
1480     BlockDriverState *bs, *bs1;
1481     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1482     int must_delete, ret;
1483     QEMUFile *f;
1484     int saved_vm_running;
1485     uint32_t vm_state_size;
1486 #ifdef _WIN32
1487     struct _timeb tb;
1488 #else
1489     struct timeval tv;
1490 #endif
1491     const char *name = qdict_get_try_str(qdict, "name");
1492
1493     bs = get_bs_snapshots();
1494     if (!bs) {
1495         monitor_printf(mon, "No block device can accept snapshots\n");
1496         return;
1497     }
1498
1499     /* ??? Should this occur after vm_stop?  */
1500     qemu_aio_flush();
1501
1502     saved_vm_running = vm_running;
1503     vm_stop(0);
1504
1505     must_delete = 0;
1506     if (name) {
1507         ret = bdrv_snapshot_find(bs, old_sn, name);
1508         if (ret >= 0) {
1509             must_delete = 1;
1510         }
1511     }
1512     memset(sn, 0, sizeof(*sn));
1513     if (must_delete) {
1514         pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1515         pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1516     } else {
1517         if (name)
1518             pstrcpy(sn->name, sizeof(sn->name), name);
1519     }
1520
1521     /* fill auxiliary fields */
1522 #ifdef _WIN32
1523     _ftime(&tb);
1524     sn->date_sec = tb.time;
1525     sn->date_nsec = tb.millitm * 1000000;
1526 #else
1527     gettimeofday(&tv, NULL);
1528     sn->date_sec = tv.tv_sec;
1529     sn->date_nsec = tv.tv_usec * 1000;
1530 #endif
1531     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1532
1533     /* save the VM state */
1534     f = qemu_fopen_bdrv(bs, 1);
1535     if (!f) {
1536         monitor_printf(mon, "Could not open VM state file\n");
1537         goto the_end;
1538     }
1539     ret = qemu_savevm_state(f);
1540     vm_state_size = qemu_ftell(f);
1541     qemu_fclose(f);
1542     if (ret < 0) {
1543         monitor_printf(mon, "Error %d while writing VM\n", ret);
1544         goto the_end;
1545     }
1546
1547     /* create the snapshots */
1548
1549     QTAILQ_FOREACH(dinfo, &drives, next) {
1550         bs1 = dinfo->bdrv;
1551         if (bdrv_has_snapshot(bs1)) {
1552             if (must_delete) {
1553                 ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
1554                 if (ret < 0) {
1555                     monitor_printf(mon,
1556                                    "Error while deleting snapshot on '%s'\n",
1557                                    bdrv_get_device_name(bs1));
1558                 }
1559             }
1560             /* Write VM state size only to the image that contains the state */
1561             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1562             ret = bdrv_snapshot_create(bs1, sn);
1563             if (ret < 0) {
1564                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1565                                bdrv_get_device_name(bs1));
1566             }
1567         }
1568     }
1569
1570  the_end:
1571     if (saved_vm_running)
1572         vm_start();
1573 }
1574
1575 int load_vmstate(Monitor *mon, const char *name)
1576 {
1577     DriveInfo *dinfo;
1578     BlockDriverState *bs, *bs1;
1579     QEMUSnapshotInfo sn;
1580     QEMUFile *f;
1581     int ret;
1582
1583     bs = get_bs_snapshots();
1584     if (!bs) {
1585         monitor_printf(mon, "No block device supports snapshots\n");
1586         return -EINVAL;
1587     }
1588
1589     /* Flush all IO requests so they don't interfere with the new state.  */
1590     qemu_aio_flush();
1591
1592     QTAILQ_FOREACH(dinfo, &drives, next) {
1593         bs1 = dinfo->bdrv;
1594         if (bdrv_has_snapshot(bs1)) {
1595             ret = bdrv_snapshot_goto(bs1, name);
1596             if (ret < 0) {
1597                 if (bs != bs1)
1598                     monitor_printf(mon, "Warning: ");
1599                 switch(ret) {
1600                 case -ENOTSUP:
1601                     monitor_printf(mon,
1602                                    "Snapshots not supported on device '%s'\n",
1603                                    bdrv_get_device_name(bs1));
1604                     break;
1605                 case -ENOENT:
1606                     monitor_printf(mon, "Could not find snapshot '%s' on "
1607                                    "device '%s'\n",
1608                                    name, bdrv_get_device_name(bs1));
1609                     break;
1610                 default:
1611                     monitor_printf(mon, "Error %d while activating snapshot on"
1612                                    " '%s'\n", ret, bdrv_get_device_name(bs1));
1613                     break;
1614                 }
1615                 /* fatal on snapshot block device */
1616                 if (bs == bs1)
1617                     return 0;
1618             }
1619         }
1620     }
1621
1622     /* Don't even try to load empty VM states */
1623     ret = bdrv_snapshot_find(bs, &sn, name);
1624     if ((ret >= 0) && (sn.vm_state_size == 0))
1625         return -EINVAL;
1626
1627     /* restore the VM state */
1628     f = qemu_fopen_bdrv(bs, 0);
1629     if (!f) {
1630         monitor_printf(mon, "Could not open VM state file\n");
1631         return -EINVAL;
1632     }
1633     ret = qemu_loadvm_state(f);
1634     qemu_fclose(f);
1635     if (ret < 0) {
1636         monitor_printf(mon, "Error %d while loading VM state\n", ret);
1637         return ret;
1638     }
1639     return 0;
1640 }
1641
1642 void do_delvm(Monitor *mon, const QDict *qdict)
1643 {
1644     DriveInfo *dinfo;
1645     BlockDriverState *bs, *bs1;
1646     int ret;
1647     const char *name = qdict_get_str(qdict, "name");
1648
1649     bs = get_bs_snapshots();
1650     if (!bs) {
1651         monitor_printf(mon, "No block device supports snapshots\n");
1652         return;
1653     }
1654
1655     QTAILQ_FOREACH(dinfo, &drives, next) {
1656         bs1 = dinfo->bdrv;
1657         if (bdrv_has_snapshot(bs1)) {
1658             ret = bdrv_snapshot_delete(bs1, name);
1659             if (ret < 0) {
1660                 if (ret == -ENOTSUP)
1661                     monitor_printf(mon,
1662                                    "Snapshots not supported on device '%s'\n",
1663                                    bdrv_get_device_name(bs1));
1664                 else
1665                     monitor_printf(mon, "Error %d while deleting snapshot on "
1666                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1667             }
1668         }
1669     }
1670 }
1671
1672 void do_info_snapshots(Monitor *mon)
1673 {
1674     DriveInfo *dinfo;
1675     BlockDriverState *bs, *bs1;
1676     QEMUSnapshotInfo *sn_tab, *sn;
1677     int nb_sns, i;
1678     char buf[256];
1679
1680     bs = get_bs_snapshots();
1681     if (!bs) {
1682         monitor_printf(mon, "No available block device supports snapshots\n");
1683         return;
1684     }
1685     monitor_printf(mon, "Snapshot devices:");
1686     QTAILQ_FOREACH(dinfo, &drives, next) {
1687         bs1 = dinfo->bdrv;
1688         if (bdrv_has_snapshot(bs1)) {
1689             if (bs == bs1)
1690                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1691         }
1692     }
1693     monitor_printf(mon, "\n");
1694
1695     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1696     if (nb_sns < 0) {
1697         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1698         return;
1699     }
1700     monitor_printf(mon, "Snapshot list (from %s):\n",
1701                    bdrv_get_device_name(bs));
1702     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1703     for(i = 0; i < nb_sns; i++) {
1704         sn = &sn_tab[i];
1705         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1706     }
1707     qemu_free(sn_tab);
1708 }