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 #include <arpa/inet.h>
  46 #include <dirent.h>
  47 #include <netdb.h>
  48 #include <sys/select.h>
  49 #ifdef CONFIG_BSD
  50 #include <sys/stat.h>
  51 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
  52 #include <libutil.h>
  53 #else
  54 #include <util.h>
  55 #endif
  56 #ifdef __linux__
  57 #include <pty.h>
  58 #include <malloc.h>
  59 #include <linux/rtc.h>
  60 #endif
  61 #endif
  62 #endif
  63
  64 #ifdef _WIN32
  65 #include <windows.h>
  66 #include <malloc.h>
  67 #include <sys/timeb.h>
  68 #include <mmsystem.h>
  69 #define getopt_long_only getopt_long
  70 #define memalign(align, size) malloc(size)
  71 #endif
  72
  73 #include "qemu-common.h"
  74 #include "hw/hw.h"
  75 #include "net.h"
  76 #include "monitor.h"
  77 #include "sysemu.h"
  78 #include "qemu-timer.h"
  79 #include "qemu-char.h"
  80 #include "blockdev.h"
  81 #include "audio/audio.h"
  82 #include "migration.h"
  83 #include "qemu_socket.h"
  84 #include "qemu-queue.h"
  85
  86 #define SELF_ANNOUNCE_ROUNDS 5
  87
  88 #ifndef ETH_P_RARP
  89 #define ETH_P_RARP 0x8035
  90 #endif
  91 #define ARP_HTYPE_ETH 0x0001
  92 #define ARP_PTYPE_IP 0x0800
  93 #define ARP_OP_REQUEST_REV 0x3
  94
  95 static int announce_self_create(uint8_t *buf,
  96                                 uint8_t *mac_addr)
  97 {
  98     /* Ethernet header. */
  99     memset(buf, 0xff, 6);         /* destination MAC addr */
 100     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 101     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 102
 103     /* RARP header. */
 104     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 105     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 106     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 107     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 108     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 109     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 110     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 111     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 112     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 113
 114     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 115     memset(buf + 42, 0x00, 18);
 116
 117     return 60; /* len (FCS will be added by hardware) */
 118 }
 119
 120 static void qemu_announce_self_iter(NICState *nic, void *opaque)
 121 {
 122     uint8_t buf[60];
 123     int len;
 124
 125     len = announce_self_create(buf, nic->conf->macaddr.a);
 126
 127     qemu_send_packet_raw(&nic->nc, buf, len);
 128 }
 129
 130
 131 static void qemu_announce_self_once(void *opaque)
 132 {
 133     static int count = SELF_ANNOUNCE_ROUNDS;
 134     QEMUTimer *timer = *(QEMUTimer **)opaque;
 135
 136     qemu_foreach_nic(qemu_announce_self_iter, NULL);
 137
 138     if (--count) {
 139         /* delay 50ms, 150ms, 250ms, ... */
 140         qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
 141                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 142     } else {
 143             qemu_del_timer(timer);
 144             qemu_free_timer(timer);
 145     }
 146 }
 147
 148 void qemu_announce_self(void)
 149 {
 150         static QEMUTimer *timer;
 151         timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
 152         qemu_announce_self_once(&timer);
 153 }
 154
 155 /***********************************************************/
 156 /* savevm/loadvm support */
 157
 158 #define IO_BUF_SIZE 32768
 159
 160 struct QEMUFile {
 161     QEMUFilePutBufferFunc *put_buffer;
 162     QEMUFileGetBufferFunc *get_buffer;
 163     QEMUFileCloseFunc *close;
 164     QEMUFileRateLimit *rate_limit;
 165     QEMUFileSetRateLimit *set_rate_limit;
 166     QEMUFileGetRateLimit *get_rate_limit;
 167     void *opaque;
 168     int is_write;
 169
 170     int64_t buf_offset; /* start of buffer when writing, end of buffer
 171                            when reading */
 172     int buf_index;
 173     int buf_size; /* 0 when writing */
 174     uint8_t buf[IO_BUF_SIZE];
 175
 176     int has_error;
 177 };
 178
 179 typedef struct QEMUFileStdio
 180 {
 181     FILE *stdio_file;
 182     QEMUFile *file;
 183 } QEMUFileStdio;
 184
 185 typedef struct QEMUFileSocket
 186 {
 187     int fd;
 188     QEMUFile *file;
 189 } QEMUFileSocket;
 190
 191 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 192 {
 193     QEMUFileSocket *s = opaque;
 194     ssize_t len;
 195
 196     do {
 197         len = recv(s->fd, (void *)buf, size, 0);
 198     } while (len == -1 && socket_error() == EINTR);
 199
 200     if (len == -1)
 201         len = -socket_error();
 202
 203     return len;
 204 }
 205
 206 static int socket_close(void *opaque)
 207 {
 208     QEMUFileSocket *s = opaque;
 209     qemu_free(s);
 210     return 0;
 211 }
 212
 213 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 214 {
 215     QEMUFileStdio *s = opaque;
 216     return fwrite(buf, 1, size, s->stdio_file);
 217 }
 218
 219 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 220 {
 221     QEMUFileStdio *s = opaque;
 222     FILE *fp = s->stdio_file;
 223     int bytes;
 224
 225     do {
 226         clearerr(fp);
 227         bytes = fread(buf, 1, size, fp);
 228     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 229     return bytes;
 230 }
 231
 232 static int stdio_pclose(void *opaque)
 233 {
 234     QEMUFileStdio *s = opaque;
 235     int ret;
 236     ret = pclose(s->stdio_file);
 237     qemu_free(s);
 238     return ret;
 239 }
 240
 241 static int stdio_fclose(void *opaque)
 242 {
 243     QEMUFileStdio *s = opaque;
 244     fclose(s->stdio_file);
 245     qemu_free(s);
 246     return 0;
 247 }
 248
 249 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 250 {
 251     QEMUFileStdio *s;
 252
 253     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 254         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 255         return NULL;
 256     }
 257
 258     s = qemu_mallocz(sizeof(QEMUFileStdio));
 259
 260     s->stdio_file = stdio_file;
 261
 262     if(mode[0] == 'r') {
 263         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 264                                  NULL, NULL, NULL);
 265     } else {
 266         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 267                                  NULL, NULL, NULL);
 268     }
 269     return s->file;
 270 }
 271
 272 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 273 {
 274     FILE *popen_file;
 275
 276     popen_file = popen(command, mode);
 277     if(popen_file == NULL) {
 278         return NULL;
 279     }
 280
 281     return qemu_popen(popen_file, mode);
 282 }
 283
 284 int qemu_stdio_fd(QEMUFile *f)
 285 {
 286     QEMUFileStdio *p;
 287     int fd;
 288
 289     p = (QEMUFileStdio *)f->opaque;
 290     fd = fileno(p->stdio_file);
 291
 292     return fd;
 293 }
 294
 295 QEMUFile *qemu_fdopen(int fd, const char *mode)
 296 {
 297     QEMUFileStdio *s;
 298
 299     if (mode == NULL ||
 300         (mode[0] != 'r' && mode[0] != 'w') ||
 301         mode[1] != 'b' || mode[2] != 0) {
 302         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 303         return NULL;
 304     }
 305
 306     s = qemu_mallocz(sizeof(QEMUFileStdio));
 307     s->stdio_file = fdopen(fd, mode);
 308     if (!s->stdio_file)
 309         goto fail;
 310
 311     if(mode[0] == 'r') {
 312         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 313                                  NULL, NULL, NULL);
 314     } else {
 315         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 316                                  NULL, NULL, NULL);
 317     }
 318     return s->file;
 319
 320 fail:
 321     qemu_free(s);
 322     return NULL;
 323 }
 324
 325 QEMUFile *qemu_fopen_socket(int fd)
 326 {
 327     QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 328
 329     s->fd = fd;
 330     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 331                              NULL, NULL, NULL);
 332     return s->file;
 333 }
 334
 335 static int file_put_buffer(void *opaque, const uint8_t *buf,
 336                             int64_t pos, int size)
 337 {
 338     QEMUFileStdio *s = opaque;
 339     fseek(s->stdio_file, pos, SEEK_SET);
 340     return fwrite(buf, 1, size, s->stdio_file);
 341 }
 342
 343 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 344 {
 345     QEMUFileStdio *s = opaque;
 346     fseek(s->stdio_file, pos, SEEK_SET);
 347     return fread(buf, 1, size, s->stdio_file);
 348 }
 349
 350 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 351 {
 352     QEMUFileStdio *s;
 353
 354     if (mode == NULL ||
 355         (mode[0] != 'r' && mode[0] != 'w') ||
 356         mode[1] != 'b' || mode[2] != 0) {
 357         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
 358         return NULL;
 359     }
 360
 361     s = qemu_mallocz(sizeof(QEMUFileStdio));
 362
 363     s->stdio_file = fopen(filename, mode);
 364     if (!s->stdio_file)
 365         goto fail;
 366
 367     if(mode[0] == 'w') {
 368         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 369                                  NULL, NULL, NULL);
 370     } else {
 371         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 372                                NULL, NULL, NULL);
 373     }
 374     return s->file;
 375 fail:
 376     qemu_free(s);
 377     return NULL;
 378 }
 379
 380 static int block_put_buffer(void *opaque, const uint8_t *buf,
 381                            int64_t pos, int size)
 382 {
 383     bdrv_save_vmstate(opaque, buf, pos, size);
 384     return size;
 385 }
 386
 387 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 388 {
 389     return bdrv_load_vmstate(opaque, buf, pos, size);
 390 }
 391
 392 static int bdrv_fclose(void *opaque)
 393 {
 394     return 0;
 395 }
 396
 397 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 398 {
 399     if (is_writable)
 400         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 401                               NULL, NULL, NULL);
 402     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 403 }
 404
 405 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 406                          QEMUFileGetBufferFunc *get_buffer,
 407                          QEMUFileCloseFunc *close,
 408                          QEMUFileRateLimit *rate_limit,
 409                          QEMUFileSetRateLimit *set_rate_limit,
 410                          QEMUFileGetRateLimit *get_rate_limit)
 411 {
 412     QEMUFile *f;
 413
 414     f = qemu_mallocz(sizeof(QEMUFile));
 415
 416     f->opaque = opaque;
 417     f->put_buffer = put_buffer;
 418     f->get_buffer = get_buffer;
 419     f->close = close;
 420     f->rate_limit = rate_limit;
 421     f->set_rate_limit = set_rate_limit;
 422     f->get_rate_limit = get_rate_limit;
 423     f->is_write = 0;
 424
 425     return f;
 426 }
 427
 428 int qemu_file_has_error(QEMUFile *f)
 429 {
 430     return f->has_error;
 431 }
 432
 433 void qemu_file_set_error(QEMUFile *f)
 434 {
 435     f->has_error = 1;
 436 }
 437
 438 void qemu_fflush(QEMUFile *f)
 439 {
 440     if (!f->put_buffer)
 441         return;
 442
 443     if (f->is_write && f->buf_index > 0) {
 444         int len;
 445
 446         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 447         if (len > 0)
 448             f->buf_offset += f->buf_index;
 449         else
 450             f->has_error = 1;
 451         f->buf_index = 0;
 452     }
 453 }
 454
 455 static void qemu_fill_buffer(QEMUFile *f)
 456 {
 457     int len;
 458
 459     if (!f->get_buffer)
 460         return;
 461
 462     if (f->is_write)
 463         abort();
 464
 465     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 466     if (len > 0) {
 467         f->buf_index = 0;
 468         f->buf_size = len;
 469         f->buf_offset += len;
 470     } else if (len != -EAGAIN)
 471         f->has_error = 1;
 472 }
 473
 474 int qemu_fclose(QEMUFile *f)
 475 {
 476     int ret = 0;
 477     qemu_fflush(f);
 478     if (f->close)
 479         ret = f->close(f->opaque);
 480     qemu_free(f);
 481     return ret;
 482 }
 483
 484 void qemu_file_put_notify(QEMUFile *f)
 485 {
 486     f->put_buffer(f->opaque, NULL, 0, 0);
 487 }
 488
 489 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 490 {
 491     int l;
 492
 493     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 494         fprintf(stderr,
 495                 "Attempted to write to buffer while read buffer is not empty\n");
 496         abort();
 497     }
 498
 499     while (!f->has_error && size > 0) {
 500         l = IO_BUF_SIZE - f->buf_index;
 501         if (l > size)
 502             l = size;
 503         memcpy(f->buf + f->buf_index, buf, l);
 504         f->is_write = 1;
 505         f->buf_index += l;
 506         buf += l;
 507         size -= l;
 508         if (f->buf_index >= IO_BUF_SIZE)
 509             qemu_fflush(f);
 510     }
 511 }
 512
 513 void qemu_put_byte(QEMUFile *f, int v)
 514 {
 515     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 516         fprintf(stderr,
 517                 "Attempted to write to buffer while read buffer is not empty\n");
 518         abort();
 519     }
 520
 521     f->buf[f->buf_index++] = v;
 522     f->is_write = 1;
 523     if (f->buf_index >= IO_BUF_SIZE)
 524         qemu_fflush(f);
 525 }
 526
 527 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 528 {
 529     int size, l;
 530
 531     if (f->is_write)
 532         abort();
 533
 534     size = size1;
 535     while (size > 0) {
 536         l = f->buf_size - f->buf_index;
 537         if (l == 0) {
 538             qemu_fill_buffer(f);
 539             l = f->buf_size - f->buf_index;
 540             if (l == 0)
 541                 break;
 542         }
 543         if (l > size)
 544             l = size;
 545         memcpy(buf, f->buf + f->buf_index, l);
 546         f->buf_index += l;
 547         buf += l;
 548         size -= l;
 549     }
 550     return size1 - size;
 551 }
 552
 553 int qemu_get_byte(QEMUFile *f)
 554 {
 555     if (f->is_write)
 556         abort();
 557
 558     if (f->buf_index >= f->buf_size) {
 559         qemu_fill_buffer(f);
 560         if (f->buf_index >= f->buf_size)
 561             return 0;
 562     }
 563     return f->buf[f->buf_index++];
 564 }
 565
 566 int64_t qemu_ftell(QEMUFile *f)
 567 {
 568     return f->buf_offset - f->buf_size + f->buf_index;
 569 }
 570
 571 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 572 {
 573     if (whence == SEEK_SET) {
 574         /* nothing to do */
 575     } else if (whence == SEEK_CUR) {
 576         pos += qemu_ftell(f);
 577     } else {
 578         /* SEEK_END not supported */
 579         return -1;
 580     }
 581     if (f->put_buffer) {
 582         qemu_fflush(f);
 583         f->buf_offset = pos;
 584     } else {
 585         f->buf_offset = pos;
 586         f->buf_index = 0;
 587         f->buf_size = 0;
 588     }
 589     return pos;
 590 }
 591
 592 int qemu_file_rate_limit(QEMUFile *f)
 593 {
 594     if (f->rate_limit)
 595         return f->rate_limit(f->opaque);
 596
 597     return 0;
 598 }
 599
 600 size_t qemu_file_get_rate_limit(QEMUFile *f)
 601 {
 602     if (f->get_rate_limit)
 603         return f->get_rate_limit(f->opaque);
 604
 605     return 0;
 606 }
 607
 608 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
 609 {
 610     /* any failed or completed migration keeps its state to allow probing of
 611      * migration data, but has no associated file anymore */
 612     if (f && f->set_rate_limit)
 613         return f->set_rate_limit(f->opaque, new_rate);
 614
 615     return 0;
 616 }
 617
 618 void qemu_put_be16(QEMUFile *f, unsigned int v)
 619 {
 620     qemu_put_byte(f, v >> 8);
 621     qemu_put_byte(f, v);
 622 }
 623
 624 void qemu_put_be32(QEMUFile *f, unsigned int v)
 625 {
 626     qemu_put_byte(f, v >> 24);
 627     qemu_put_byte(f, v >> 16);
 628     qemu_put_byte(f, v >> 8);
 629     qemu_put_byte(f, v);
 630 }
 631
 632 void qemu_put_be64(QEMUFile *f, uint64_t v)
 633 {
 634     qemu_put_be32(f, v >> 32);
 635     qemu_put_be32(f, v);
 636 }
 637
 638 unsigned int qemu_get_be16(QEMUFile *f)
 639 {
 640     unsigned int v;
 641     v = qemu_get_byte(f) << 8;
 642     v |= qemu_get_byte(f);
 643     return v;
 644 }
 645
 646 unsigned int qemu_get_be32(QEMUFile *f)
 647 {
 648     unsigned int v;
 649     v = qemu_get_byte(f) << 24;
 650     v |= qemu_get_byte(f) << 16;
 651     v |= qemu_get_byte(f) << 8;
 652     v |= qemu_get_byte(f);
 653     return v;
 654 }
 655
 656 uint64_t qemu_get_be64(QEMUFile *f)
 657 {
 658     uint64_t v;
 659     v = (uint64_t)qemu_get_be32(f) << 32;
 660     v |= qemu_get_be32(f);
 661     return v;
 662 }
 663
 664 /* 8 bit int */
 665
 666 static int get_int8(QEMUFile *f, void *pv, size_t size)
 667 {
 668     int8_t *v = pv;
 669     qemu_get_s8s(f, v);
 670     return 0;
 671 }
 672
 673 static void put_int8(QEMUFile *f, void *pv, size_t size)
 674 {
 675     int8_t *v = pv;
 676     qemu_put_s8s(f, v);
 677 }
 678
 679 const VMStateInfo vmstate_info_int8 = {
 680     .name = "int8",
 681     .get  = get_int8,
 682     .put  = put_int8,
 683 };
 684
 685 /* 16 bit int */
 686
 687 static int get_int16(QEMUFile *f, void *pv, size_t size)
 688 {
 689     int16_t *v = pv;
 690     qemu_get_sbe16s(f, v);
 691     return 0;
 692 }
 693
 694 static void put_int16(QEMUFile *f, void *pv, size_t size)
 695 {
 696     int16_t *v = pv;
 697     qemu_put_sbe16s(f, v);
 698 }
 699
 700 const VMStateInfo vmstate_info_int16 = {
 701     .name = "int16",
 702     .get  = get_int16,
 703     .put  = put_int16,
 704 };
 705
 706 /* 32 bit int */
 707
 708 static int get_int32(QEMUFile *f, void *pv, size_t size)
 709 {
 710     int32_t *v = pv;
 711     qemu_get_sbe32s(f, v);
 712     return 0;
 713 }
 714
 715 static void put_int32(QEMUFile *f, void *pv, size_t size)
 716 {
 717     int32_t *v = pv;
 718     qemu_put_sbe32s(f, v);
 719 }
 720
 721 const VMStateInfo vmstate_info_int32 = {
 722     .name = "int32",
 723     .get  = get_int32,
 724     .put  = put_int32,
 725 };
 726
 727 /* 32 bit int. See that the received value is the same than the one
 728    in the field */
 729
 730 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 731 {
 732     int32_t *v = pv;
 733     int32_t v2;
 734     qemu_get_sbe32s(f, &v2);
 735
 736     if (*v == v2)
 737         return 0;
 738     return -EINVAL;
 739 }
 740
 741 const VMStateInfo vmstate_info_int32_equal = {
 742     .name = "int32 equal",
 743     .get  = get_int32_equal,
 744     .put  = put_int32,
 745 };
 746
 747 /* 32 bit int. See that the received value is the less or the same
 748    than the one in the field */
 749
 750 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 751 {
 752     int32_t *old = pv;
 753     int32_t new;
 754     qemu_get_sbe32s(f, &new);
 755
 756     if (*old <= new)
 757         return 0;
 758     return -EINVAL;
 759 }
 760
 761 const VMStateInfo vmstate_info_int32_le = {
 762     .name = "int32 equal",
 763     .get  = get_int32_le,
 764     .put  = put_int32,
 765 };
 766
 767 /* 64 bit int */
 768
 769 static int get_int64(QEMUFile *f, void *pv, size_t size)
 770 {
 771     int64_t *v = pv;
 772     qemu_get_sbe64s(f, v);
 773     return 0;
 774 }
 775
 776 static void put_int64(QEMUFile *f, void *pv, size_t size)
 777 {
 778     int64_t *v = pv;
 779     qemu_put_sbe64s(f, v);
 780 }
 781
 782 const VMStateInfo vmstate_info_int64 = {
 783     .name = "int64",
 784     .get  = get_int64,
 785     .put  = put_int64,
 786 };
 787
 788 /* 8 bit unsigned int */
 789
 790 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 791 {
 792     uint8_t *v = pv;
 793     qemu_get_8s(f, v);
 794     return 0;
 795 }
 796
 797 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 798 {
 799     uint8_t *v = pv;
 800     qemu_put_8s(f, v);
 801 }
 802
 803 const VMStateInfo vmstate_info_uint8 = {
 804     .name = "uint8",
 805     .get  = get_uint8,
 806     .put  = put_uint8,
 807 };
 808
 809 /* 16 bit unsigned int */
 810
 811 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 812 {
 813     uint16_t *v = pv;
 814     qemu_get_be16s(f, v);
 815     return 0;
 816 }
 817
 818 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 819 {
 820     uint16_t *v = pv;
 821     qemu_put_be16s(f, v);
 822 }
 823
 824 const VMStateInfo vmstate_info_uint16 = {
 825     .name = "uint16",
 826     .get  = get_uint16,
 827     .put  = put_uint16,
 828 };
 829
 830 /* 32 bit unsigned int */
 831
 832 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 833 {
 834     uint32_t *v = pv;
 835     qemu_get_be32s(f, v);
 836     return 0;
 837 }
 838
 839 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 840 {
 841     uint32_t *v = pv;
 842     qemu_put_be32s(f, v);
 843 }
 844
 845 const VMStateInfo vmstate_info_uint32 = {
 846     .name = "uint32",
 847     .get  = get_uint32,
 848     .put  = put_uint32,
 849 };
 850
 851 /* 64 bit unsigned int */
 852
 853 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 854 {
 855     uint64_t *v = pv;
 856     qemu_get_be64s(f, v);
 857     return 0;
 858 }
 859
 860 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 861 {
 862     uint64_t *v = pv;
 863     qemu_put_be64s(f, v);
 864 }
 865
 866 const VMStateInfo vmstate_info_uint64 = {
 867     .name = "uint64",
 868     .get  = get_uint64,
 869     .put  = put_uint64,
 870 };
 871
 872 /* 8 bit int. See that the received value is the same than the one
 873    in the field */
 874
 875 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 876 {
 877     uint8_t *v = pv;
 878     uint8_t v2;
 879     qemu_get_8s(f, &v2);
 880
 881     if (*v == v2)
 882         return 0;
 883     return -EINVAL;
 884 }
 885
 886 const VMStateInfo vmstate_info_uint8_equal = {
 887     .name = "uint8 equal",
 888     .get  = get_uint8_equal,
 889     .put  = put_uint8,
 890 };
 891
 892 /* 16 bit unsigned int int. See that the received value is the same than the one
 893    in the field */
 894
 895 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 896 {
 897     uint16_t *v = pv;
 898     uint16_t v2;
 899     qemu_get_be16s(f, &v2);
 900
 901     if (*v == v2)
 902         return 0;
 903     return -EINVAL;
 904 }
 905
 906 const VMStateInfo vmstate_info_uint16_equal = {
 907     .name = "uint16 equal",
 908     .get  = get_uint16_equal,
 909     .put  = put_uint16,
 910 };
 911
 912 /* timers  */
 913
 914 static int get_timer(QEMUFile *f, void *pv, size_t size)
 915 {
 916     QEMUTimer *v = pv;
 917     qemu_get_timer(f, v);
 918     return 0;
 919 }
 920
 921 static void put_timer(QEMUFile *f, void *pv, size_t size)
 922 {
 923     QEMUTimer *v = pv;
 924     qemu_put_timer(f, v);
 925 }
 926
 927 const VMStateInfo vmstate_info_timer = {
 928     .name = "timer",
 929     .get  = get_timer,
 930     .put  = put_timer,
 931 };
 932
 933 /* uint8_t buffers */
 934
 935 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 936 {
 937     uint8_t *v = pv;
 938     qemu_get_buffer(f, v, size);
 939     return 0;
 940 }
 941
 942 static void put_buffer(QEMUFile *f, void *pv, size_t size)
 943 {
 944     uint8_t *v = pv;
 945     qemu_put_buffer(f, v, size);
 946 }
 947
 948 const VMStateInfo vmstate_info_buffer = {
 949     .name = "buffer",
 950     .get  = get_buffer,
 951     .put  = put_buffer,
 952 };
 953
 954 /* unused buffers: space that was used for some fields that are
 955    not usefull anymore */
 956
 957 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
 958 {
 959     uint8_t buf[1024];
 960     int block_len;
 961
 962     while (size > 0) {
 963         block_len = MIN(sizeof(buf), size);
 964         size -= block_len;
 965         qemu_get_buffer(f, buf, block_len);
 966     }
 967    return 0;
 968 }
 969
 970 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
 971 {
 972     static const uint8_t buf[1024];
 973     int block_len;
 974
 975     while (size > 0) {
 976         block_len = MIN(sizeof(buf), size);
 977         size -= block_len;
 978         qemu_put_buffer(f, buf, block_len);
 979     }
 980 }
 981
 982 const VMStateInfo vmstate_info_unused_buffer = {
 983     .name = "unused_buffer",
 984     .get  = get_unused_buffer,
 985     .put  = put_unused_buffer,
 986 };
 987
 988 typedef struct SaveStateEntry {
 989     QTAILQ_ENTRY(SaveStateEntry) entry;
 990     char idstr[256];
 991     int instance_id;
 992     int alias_id;
 993     int version_id;
 994     int section_id;
 995     SaveSetParamsHandler *set_params;
 996     SaveLiveStateHandler *save_live_state;
 997     SaveStateHandler *save_state;
 998     LoadStateHandler *load_state;
 999     const VMStateDescription *vmsd;
1000     void *opaque;
1001 } SaveStateEntry;
1002
1003
1004 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1005     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1006 static int global_section_id;
1007
1008 static int calculate_new_instance_id(const char *idstr)
1009 {
1010     SaveStateEntry *se;
1011     int instance_id = 0;
1012
1013     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1014         if (strcmp(idstr, se->idstr) == 0
1015             && instance_id <= se->instance_id) {
1016             instance_id = se->instance_id + 1;
1017         }
1018     }
1019     return instance_id;
1020 }
1021
1022 /* TODO: Individual devices generally have very little idea about the rest
1023    of the system, so instance_id should be removed/replaced.
1024    Meanwhile pass -1 as instance_id if you do not already have a clearly
1025    distinguishing id for all instances of your device class. */
1026 int register_savevm_live(const char *idstr,
1027                          int instance_id,
1028                          int version_id,
1029                          SaveSetParamsHandler *set_params,
1030                          SaveLiveStateHandler *save_live_state,
1031                          SaveStateHandler *save_state,
1032                          LoadStateHandler *load_state,
1033                          void *opaque)
1034 {
1035     SaveStateEntry *se;
1036
1037     se = qemu_mallocz(sizeof(SaveStateEntry));
1038     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
1039     se->version_id = version_id;
1040     se->section_id = global_section_id++;
1041     se->set_params = set_params;
1042     se->save_live_state = save_live_state;
1043     se->save_state = save_state;
1044     se->load_state = load_state;
1045     se->opaque = opaque;
1046     se->vmsd = NULL;
1047
1048     if (instance_id == -1) {
1049         se->instance_id = calculate_new_instance_id(idstr);
1050     } else {
1051         se->instance_id = instance_id;
1052     }
1053     /* add at the end of list */
1054     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1055     return 0;
1056 }
1057
1058 int register_savevm(const char *idstr,
1059                     int instance_id,
1060                     int version_id,
1061                     SaveStateHandler *save_state,
1062                     LoadStateHandler *load_state,
1063                     void *opaque)
1064 {
1065     return register_savevm_live(idstr, instance_id, version_id,
1066                                 NULL, NULL, save_state, load_state, opaque);
1067 }
1068
1069 void unregister_savevm(const char *idstr, void *opaque)
1070 {
1071     SaveStateEntry *se, *new_se;
1072
1073     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1074         if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
1075             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1076             qemu_free(se);
1077         }
1078     }
1079 }
1080
1081 int vmstate_register_with_alias_id(int instance_id,
1082                                    const VMStateDescription *vmsd,
1083                                    void *opaque, int alias_id,
1084                                    int required_for_version)
1085 {
1086     SaveStateEntry *se;
1087
1088     /* If this triggers, alias support can be dropped for the vmsd. */
1089     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1090
1091     se = qemu_mallocz(sizeof(SaveStateEntry));
1092     pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
1093     se->version_id = vmsd->version_id;
1094     se->section_id = global_section_id++;
1095     se->save_live_state = NULL;
1096     se->save_state = NULL;
1097     se->load_state = NULL;
1098     se->opaque = opaque;
1099     se->vmsd = vmsd;
1100     se->alias_id = alias_id;
1101
1102     if (instance_id == -1) {
1103         se->instance_id = calculate_new_instance_id(vmsd->name);
1104     } else {
1105         se->instance_id = instance_id;
1106     }
1107     /* add at the end of list */
1108     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1109     return 0;
1110 }
1111
1112 int vmstate_register(int instance_id, const VMStateDescription *vmsd,
1113                      void *opaque)
1114 {
1115     return vmstate_register_with_alias_id(instance_id, vmsd, opaque, -1, 0);
1116 }
1117
1118 void vmstate_unregister(const VMStateDescription *vmsd, void *opaque)
1119 {
1120     SaveStateEntry *se, *new_se;
1121
1122     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1123         if (se->vmsd == vmsd && se->opaque == opaque) {
1124             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1125             qemu_free(se);
1126         }
1127     }
1128 }
1129
1130 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1131                        void *opaque, int version_id)
1132 {
1133     VMStateField *field = vmsd->fields;
1134
1135     if (version_id > vmsd->version_id) {
1136         return -EINVAL;
1137     }
1138     if (version_id < vmsd->minimum_version_id_old) {
1139         return -EINVAL;
1140     }
1141     if  (version_id < vmsd->minimum_version_id) {
1142         return vmsd->load_state_old(f, opaque, version_id);
1143     }
1144     if (vmsd->pre_load) {
1145         int ret = vmsd->pre_load(opaque);
1146         if (ret)
1147             return ret;
1148     }
1149     while(field->name) {
1150         if ((field->field_exists &&
1151              field->field_exists(opaque, version_id)) ||
1152             (!field->field_exists &&
1153              field->version_id <= version_id)) {
1154             void *base_addr = opaque + field->offset;
1155             int ret, i, n_elems = 1;
1156             int size = field->size;
1157
1158             if (field->flags & VMS_VBUFFER) {
1159                 size = *(int32_t *)(opaque+field->size_offset);
1160                 if (field->flags & VMS_MULTIPLY) {
1161                     size *= field->size;
1162                 }
1163             }
1164             if (field->flags & VMS_ARRAY) {
1165                 n_elems = field->num;
1166             } else if (field->flags & VMS_VARRAY_INT32) {
1167                 n_elems = *(int32_t *)(opaque+field->num_offset);
1168             } else if (field->flags & VMS_VARRAY_UINT16) {
1169                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1170             }
1171             if (field->flags & VMS_POINTER) {
1172                 base_addr = *(void **)base_addr + field->start;
1173             }
1174             for (i = 0; i < n_elems; i++) {
1175                 void *addr = base_addr + size * i;
1176
1177                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1178                     addr = *(void **)addr;
1179                 }
1180                 if (field->flags & VMS_STRUCT) {
1181                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1182                 } else {
1183                     ret = field->info->get(f, addr, size);
1184
1185                 }
1186                 if (ret < 0) {
1187                     return ret;
1188                 }
1189             }
1190         }
1191         field++;
1192     }
1193     if (vmsd->post_load) {
1194         return vmsd->post_load(opaque, version_id);
1195     }
1196     return 0;
1197 }
1198
1199 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1200                         void *opaque)
1201 {
1202     VMStateField *field = vmsd->fields;
1203
1204     if (vmsd->pre_save) {
1205         vmsd->pre_save(opaque);
1206     }
1207     while(field->name) {
1208         if (!field->field_exists ||
1209             field->field_exists(opaque, vmsd->version_id)) {
1210             void *base_addr = opaque + field->offset;
1211             int i, n_elems = 1;
1212             int size = field->size;
1213
1214             if (field->flags & VMS_VBUFFER) {
1215                 size = *(int32_t *)(opaque+field->size_offset);
1216                 if (field->flags & VMS_MULTIPLY) {
1217                     size *= field->size;
1218                 }
1219             }
1220             if (field->flags & VMS_ARRAY) {
1221                 n_elems = field->num;
1222             } else if (field->flags & VMS_VARRAY_INT32) {
1223                 n_elems = *(int32_t *)(opaque+field->num_offset);
1224             } else if (field->flags & VMS_VARRAY_UINT16) {
1225                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1226             }
1227             if (field->flags & VMS_POINTER) {
1228                 base_addr = *(void **)base_addr + field->start;
1229             }
1230             for (i = 0; i < n_elems; i++) {
1231                 void *addr = base_addr + size * i;
1232
1233                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1234                     addr = *(void **)addr;
1235                 }
1236                 if (field->flags & VMS_STRUCT) {
1237                     vmstate_save_state(f, field->vmsd, addr);
1238                 } else {
1239                     field->info->put(f, addr, size);
1240                 }
1241             }
1242         }
1243         field++;
1244     }
1245 }
1246
1247 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1248 {
1249     if (!se->vmsd) {         /* Old style */
1250         return se->load_state(f, se->opaque, version_id);
1251     }
1252     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1253 }
1254
1255 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1256 {
1257     if (!se->vmsd) {         /* Old style */
1258         se->save_state(f, se->opaque);
1259         return;
1260     }
1261     vmstate_save_state(f,se->vmsd, se->opaque);
1262 }
1263
1264 #define QEMU_VM_FILE_MAGIC           0x5145564d
1265 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1266 #define QEMU_VM_FILE_VERSION         0x00000003
1267
1268 #define QEMU_VM_EOF                  0x00
1269 #define QEMU_VM_SECTION_START        0x01
1270 #define QEMU_VM_SECTION_PART         0x02
1271 #define QEMU_VM_SECTION_END          0x03
1272 #define QEMU_VM_SECTION_FULL         0x04
1273
1274 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1275                             int shared)
1276 {
1277     SaveStateEntry *se;
1278
1279     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1280         if(se->set_params == NULL) {
1281             continue;
1282         }
1283         se->set_params(blk_enable, shared, se->opaque);
1284     }
1285
1286     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1287     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1288
1289     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1290         int len;
1291
1292         if (se->save_live_state == NULL)
1293             continue;
1294
1295         /* Section type */
1296         qemu_put_byte(f, QEMU_VM_SECTION_START);
1297         qemu_put_be32(f, se->section_id);
1298
1299         /* ID string */
1300         len = strlen(se->idstr);
1301         qemu_put_byte(f, len);
1302         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1303
1304         qemu_put_be32(f, se->instance_id);
1305         qemu_put_be32(f, se->version_id);
1306
1307         se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1308     }
1309
1310     if (qemu_file_has_error(f)) {
1311         qemu_savevm_state_cancel(mon, f);
1312         return -EIO;
1313     }
1314
1315     return 0;
1316 }
1317
1318 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1319 {
1320     SaveStateEntry *se;
1321     int ret = 1;
1322
1323     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1324         if (se->save_live_state == NULL)
1325             continue;
1326
1327         /* Section type */
1328         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1329         qemu_put_be32(f, se->section_id);
1330
1331         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1332         if (!ret) {
1333             /* Do not proceed to the next vmstate before this one reported
1334                completion of the current stage. This serializes the migration
1335                and reduces the probability that a faster changing state is
1336                synchronized over and over again. */
1337             break;
1338         }
1339     }
1340
1341     if (ret)
1342         return 1;
1343
1344     if (qemu_file_has_error(f)) {
1345         qemu_savevm_state_cancel(mon, f);
1346         return -EIO;
1347     }
1348
1349     return 0;
1350 }
1351
1352 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1353 {
1354     SaveStateEntry *se;
1355
1356     cpu_synchronize_all_states();
1357
1358     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1359         if (se->save_live_state == NULL)
1360             continue;
1361
1362         /* Section type */
1363         qemu_put_byte(f, QEMU_VM_SECTION_END);
1364         qemu_put_be32(f, se->section_id);
1365
1366         se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1367     }
1368
1369     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1370         int len;
1371
1372         if (se->save_state == NULL && se->vmsd == NULL)
1373             continue;
1374
1375         /* Section type */
1376         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1377         qemu_put_be32(f, se->section_id);
1378
1379         /* ID string */
1380         len = strlen(se->idstr);
1381         qemu_put_byte(f, len);
1382         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1383
1384         qemu_put_be32(f, se->instance_id);
1385         qemu_put_be32(f, se->version_id);
1386
1387         vmstate_save(f, se);
1388     }
1389
1390     qemu_put_byte(f, QEMU_VM_EOF);
1391
1392     if (qemu_file_has_error(f))
1393         return -EIO;
1394
1395     return 0;
1396 }
1397
1398 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1399 {
1400     SaveStateEntry *se;
1401
1402     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1403         if (se->save_live_state) {
1404             se->save_live_state(mon, f, -1, se->opaque);
1405         }
1406     }
1407 }
1408
1409 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1410 {
1411     int saved_vm_running;
1412     int ret;
1413
1414     saved_vm_running = vm_running;
1415     vm_stop(0);
1416
1417     bdrv_flush_all();
1418
1419     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1420     if (ret < 0)
1421         goto out;
1422
1423     do {
1424         ret = qemu_savevm_state_iterate(mon, f);
1425         if (ret < 0)
1426             goto out;
1427     } while (ret == 0);
1428
1429     ret = qemu_savevm_state_complete(mon, f);
1430
1431 out:
1432     if (qemu_file_has_error(f))
1433         ret = -EIO;
1434
1435     if (!ret && saved_vm_running)
1436         vm_start();
1437
1438     return ret;
1439 }
1440
1441 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1442 {
1443     SaveStateEntry *se;
1444
1445     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1446         if (!strcmp(se->idstr, idstr) &&
1447             (instance_id == se->instance_id ||
1448              instance_id == se->alias_id))
1449             return se;
1450     }
1451     return NULL;
1452 }
1453
1454 typedef struct LoadStateEntry {
1455     QLIST_ENTRY(LoadStateEntry) entry;
1456     SaveStateEntry *se;
1457     int section_id;
1458     int version_id;
1459 } LoadStateEntry;
1460
1461 int qemu_loadvm_state(QEMUFile *f)
1462 {
1463     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1464         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1465     LoadStateEntry *le, *new_le;
1466     uint8_t section_type;
1467     unsigned int v;
1468     int ret;
1469
1470     v = qemu_get_be32(f);
1471     if (v != QEMU_VM_FILE_MAGIC)
1472         return -EINVAL;
1473
1474     v = qemu_get_be32(f);
1475     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1476         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1477         return -ENOTSUP;
1478     }
1479     if (v != QEMU_VM_FILE_VERSION)
1480         return -ENOTSUP;
1481
1482     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1483         uint32_t instance_id, version_id, section_id;
1484         SaveStateEntry *se;
1485         char idstr[257];
1486         int len;
1487
1488         switch (section_type) {
1489         case QEMU_VM_SECTION_START:
1490         case QEMU_VM_SECTION_FULL:
1491             /* Read section start */
1492             section_id = qemu_get_be32(f);
1493             len = qemu_get_byte(f);
1494             qemu_get_buffer(f, (uint8_t *)idstr, len);
1495             idstr[len] = 0;
1496             instance_id = qemu_get_be32(f);
1497             version_id = qemu_get_be32(f);
1498
1499             /* Find savevm section */
1500             se = find_se(idstr, instance_id);
1501             if (se == NULL) {
1502                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1503                 ret = -EINVAL;
1504                 goto out;
1505             }
1506
1507             /* Validate version */
1508             if (version_id > se->version_id) {
1509                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1510                         version_id, idstr, se->version_id);
1511                 ret = -EINVAL;
1512                 goto out;
1513             }
1514
1515             /* Add entry */
1516             le = qemu_mallocz(sizeof(*le));
1517
1518             le->se = se;
1519             le->section_id = section_id;
1520             le->version_id = version_id;
1521             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1522
1523             ret = vmstate_load(f, le->se, le->version_id);
1524             if (ret < 0) {
1525                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1526                         instance_id, idstr);
1527                 goto out;
1528             }
1529             break;
1530         case QEMU_VM_SECTION_PART:
1531         case QEMU_VM_SECTION_END:
1532             section_id = qemu_get_be32(f);
1533
1534             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1535                 if (le->section_id == section_id) {
1536                     break;
1537                 }
1538             }
1539             if (le == NULL) {
1540                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1541                 ret = -EINVAL;
1542                 goto out;
1543             }
1544
1545             ret = vmstate_load(f, le->se, le->version_id);
1546             if (ret < 0) {
1547                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1548                         section_id);
1549                 goto out;
1550             }
1551             break;
1552         default:
1553             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1554             ret = -EINVAL;
1555             goto out;
1556         }
1557     }
1558
1559     cpu_synchronize_all_post_init();
1560
1561     ret = 0;
1562
1563 out:
1564     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1565         QLIST_REMOVE(le, entry);
1566         qemu_free(le);
1567     }
1568
1569     if (qemu_file_has_error(f))
1570         ret = -EIO;
1571
1572     return ret;
1573 }
1574
1575 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1576                               const char *name)
1577 {
1578     QEMUSnapshotInfo *sn_tab, *sn;
1579     int nb_sns, i, ret;
1580
1581     ret = -ENOENT;
1582     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1583     if (nb_sns < 0)
1584         return ret;
1585     for(i = 0; i < nb_sns; i++) {
1586         sn = &sn_tab[i];
1587         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1588             *sn_info = *sn;
1589             ret = 0;
1590             break;
1591         }
1592     }
1593     qemu_free(sn_tab);
1594     return ret;
1595 }
1596
1597 /*
1598  * Deletes snapshots of a given name in all opened images.
1599  */
1600 static int del_existing_snapshots(Monitor *mon, const char *name)
1601 {
1602     BlockDriverState *bs;
1603     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1604     int ret;
1605
1606     bs = NULL;
1607     while ((bs = bdrv_next(bs))) {
1608         if (bdrv_can_snapshot(bs) &&
1609             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1610         {
1611             ret = bdrv_snapshot_delete(bs, name);
1612             if (ret < 0) {
1613                 monitor_printf(mon,
1614                                "Error while deleting snapshot on '%s'\n",
1615                                bdrv_get_device_name(bs));
1616                 return -1;
1617             }
1618         }
1619     }
1620
1621     return 0;
1622 }
1623
1624 void do_savevm(Monitor *mon, const QDict *qdict)
1625 {
1626     BlockDriverState *bs, *bs1;
1627     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1628     int ret;
1629     QEMUFile *f;
1630     int saved_vm_running;
1631     uint32_t vm_state_size;
1632 #ifdef _WIN32
1633     struct _timeb tb;
1634 #else
1635     struct timeval tv;
1636 #endif
1637     const char *name = qdict_get_try_str(qdict, "name");
1638
1639     /* Verify if there is a device that doesn't support snapshots and is writable */
1640     bs = NULL;
1641     while ((bs = bdrv_next(bs))) {
1642
1643         if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1644             continue;
1645         }
1646
1647         if (!bdrv_can_snapshot(bs)) {
1648             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
1649                                bdrv_get_device_name(bs));
1650             return;
1651         }
1652     }
1653
1654     bs = bdrv_snapshots();
1655     if (!bs) {
1656         monitor_printf(mon, "No block device can accept snapshots\n");
1657         return;
1658     }
1659     /* ??? Should this occur after vm_stop?  */
1660     qemu_aio_flush();
1661
1662     saved_vm_running = vm_running;
1663     vm_stop(0);
1664
1665     memset(sn, 0, sizeof(*sn));
1666     if (name) {
1667         ret = bdrv_snapshot_find(bs, old_sn, name);
1668         if (ret >= 0) {
1669             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1670             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1671         } else {
1672             pstrcpy(sn->name, sizeof(sn->name), name);
1673         }
1674     }
1675
1676     /* fill auxiliary fields */
1677 #ifdef _WIN32
1678     _ftime(&tb);
1679     sn->date_sec = tb.time;
1680     sn->date_nsec = tb.millitm * 1000000;
1681 #else
1682     gettimeofday(&tv, NULL);
1683     sn->date_sec = tv.tv_sec;
1684     sn->date_nsec = tv.tv_usec * 1000;
1685 #endif
1686     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1687
1688     /* Delete old snapshots of the same name */
1689     if (name && del_existing_snapshots(mon, name) < 0) {
1690         goto the_end;
1691     }
1692
1693     /* save the VM state */
1694     f = qemu_fopen_bdrv(bs, 1);
1695     if (!f) {
1696         monitor_printf(mon, "Could not open VM state file\n");
1697         goto the_end;
1698     }
1699     ret = qemu_savevm_state(mon, f);
1700     vm_state_size = qemu_ftell(f);
1701     qemu_fclose(f);
1702     if (ret < 0) {
1703         monitor_printf(mon, "Error %d while writing VM\n", ret);
1704         goto the_end;
1705     }
1706
1707     /* create the snapshots */
1708
1709     bs1 = NULL;
1710     while ((bs1 = bdrv_next(bs1))) {
1711         if (bdrv_can_snapshot(bs1)) {
1712             /* Write VM state size only to the image that contains the state */
1713             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1714             ret = bdrv_snapshot_create(bs1, sn);
1715             if (ret < 0) {
1716                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1717                                bdrv_get_device_name(bs1));
1718             }
1719         }
1720     }
1721
1722  the_end:
1723     if (saved_vm_running)
1724         vm_start();
1725 }
1726
1727 int load_vmstate(const char *name)
1728 {
1729     BlockDriverState *bs, *bs1;
1730     QEMUSnapshotInfo sn;
1731     QEMUFile *f;
1732     int ret;
1733
1734     /* Verify if there is a device that doesn't support snapshots and is writable */
1735     bs = NULL;
1736     while ((bs = bdrv_next(bs))) {
1737
1738         if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
1739             continue;
1740         }
1741
1742         if (!bdrv_can_snapshot(bs)) {
1743             error_report("Device '%s' is writable but does not support snapshots.",
1744                                bdrv_get_device_name(bs));
1745             return -ENOTSUP;
1746         }
1747     }
1748
1749     bs = bdrv_snapshots();
1750     if (!bs) {
1751         error_report("No block device supports snapshots");
1752         return -EINVAL;
1753     }
1754
1755     /* Flush all IO requests so they don't interfere with the new state.  */
1756     qemu_aio_flush();
1757
1758     bs1 = NULL;
1759     while ((bs1 = bdrv_next(bs1))) {
1760         if (bdrv_can_snapshot(bs1)) {
1761             ret = bdrv_snapshot_goto(bs1, name);
1762             if (ret < 0) {
1763                 switch(ret) {
1764                 case -ENOTSUP:
1765                     error_report("%sSnapshots not supported on device '%s'",
1766                                  bs != bs1 ? "Warning: " : "",
1767                                  bdrv_get_device_name(bs1));
1768                     break;
1769                 case -ENOENT:
1770                     error_report("%sCould not find snapshot '%s' on device '%s'",
1771                                  bs != bs1 ? "Warning: " : "",
1772                                  name, bdrv_get_device_name(bs1));
1773                     break;
1774                 default:
1775                     error_report("%sError %d while activating snapshot on '%s'",
1776                                  bs != bs1 ? "Warning: " : "",
1777                                  ret, bdrv_get_device_name(bs1));
1778                     break;
1779                 }
1780                 /* fatal on snapshot block device */
1781                 if (bs == bs1)
1782                     return 0;
1783             }
1784         }
1785     }
1786
1787     /* Don't even try to load empty VM states */
1788     ret = bdrv_snapshot_find(bs, &sn, name);
1789     if ((ret >= 0) && (sn.vm_state_size == 0))
1790         return -EINVAL;
1791
1792     /* restore the VM state */
1793     f = qemu_fopen_bdrv(bs, 0);
1794     if (!f) {
1795         error_report("Could not open VM state file");
1796         return -EINVAL;
1797     }
1798     ret = qemu_loadvm_state(f);
1799     qemu_fclose(f);
1800     if (ret < 0) {
1801         error_report("Error %d while loading VM state", ret);
1802         return ret;
1803     }
1804     return 0;
1805 }
1806
1807 void do_delvm(Monitor *mon, const QDict *qdict)
1808 {
1809     BlockDriverState *bs, *bs1;
1810     int ret;
1811     const char *name = qdict_get_str(qdict, "name");
1812
1813     bs = bdrv_snapshots();
1814     if (!bs) {
1815         monitor_printf(mon, "No block device supports snapshots\n");
1816         return;
1817     }
1818
1819     bs1 = NULL;
1820     while ((bs1 = bdrv_next(bs1))) {
1821         if (bdrv_can_snapshot(bs1)) {
1822             ret = bdrv_snapshot_delete(bs1, name);
1823             if (ret < 0) {
1824                 if (ret == -ENOTSUP)
1825                     monitor_printf(mon,
1826                                    "Snapshots not supported on device '%s'\n",
1827                                    bdrv_get_device_name(bs1));
1828                 else
1829                     monitor_printf(mon, "Error %d while deleting snapshot on "
1830                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1831             }
1832         }
1833     }
1834 }
1835
1836 void do_info_snapshots(Monitor *mon)
1837 {
1838     BlockDriverState *bs, *bs1;
1839     QEMUSnapshotInfo *sn_tab, *sn;
1840     int nb_sns, i;
1841     char buf[256];
1842
1843     bs = bdrv_snapshots();
1844     if (!bs) {
1845         monitor_printf(mon, "No available block device supports snapshots\n");
1846         return;
1847     }
1848     monitor_printf(mon, "Snapshot devices:");
1849     bs1 = NULL;
1850     while ((bs1 = bdrv_next(bs1))) {
1851         if (bdrv_can_snapshot(bs1)) {
1852             if (bs == bs1)
1853                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1854         }
1855     }
1856     monitor_printf(mon, "\n");
1857
1858     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1859     if (nb_sns < 0) {
1860         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1861         return;
1862     }
1863     monitor_printf(mon, "Snapshot list (from %s):\n",
1864                    bdrv_get_device_name(bs));
1865     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1866     for(i = 0; i < nb_sns; i++) {
1867         sn = &sn_tab[i];
1868         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1869     }
1870     qemu_free(sn_tab);
1871 }