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 "block.h"
  81 #include "audio/audio.h"
  82 #include "migration.h"
  83 #include "qemu_socket.h"
  84 #include "qemu-queue.h"
  85
  86 /* point to the block driver where the snapshots are managed */
  87 static BlockDriverState *bs_snapshots;
  88
  89 #define SELF_ANNOUNCE_ROUNDS 5
  90
  91 #ifndef ETH_P_RARP
  92 #define ETH_P_RARP 0x0835
  93 #endif
  94 #define ARP_HTYPE_ETH 0x0001
  95 #define ARP_PTYPE_IP 0x0800
  96 #define ARP_OP_REQUEST_REV 0x3
  97
  98 static int announce_self_create(uint8_t *buf,
  99                                 uint8_t *mac_addr)
 100 {
 101     /* Ethernet header. */
 102     memset(buf, 0xff, 6);         /* destination MAC addr */
 103     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 104     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 105
 106     /* RARP header. */
 107     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 108     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 109     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 110     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 111     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 112     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 113     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 114     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 115     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 116
 117     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 118     memset(buf + 42, 0x00, 18);
 119
 120     return 60; /* len (FCS will be added by hardware) */
 121 }
 122
 123 static void qemu_announce_self_iter(NICState *nic, void *opaque)
 124 {
 125     uint8_t buf[60];
 126     int len;
 127
 128     len = announce_self_create(buf, nic->conf->macaddr.a);
 129
 130     qemu_send_packet_raw(&nic->nc, buf, len);
 131 }
 132
 133
 134 static void qemu_announce_self_once(void *opaque)
 135 {
 136     static int count = SELF_ANNOUNCE_ROUNDS;
 137     QEMUTimer *timer = *(QEMUTimer **)opaque;
 138
 139     qemu_foreach_nic(qemu_announce_self_iter, NULL);
 140
 141     if (--count) {
 142         /* delay 50ms, 150ms, 250ms, ... */
 143         qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
 144                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 145     } else {
 146             qemu_del_timer(timer);
 147             qemu_free_timer(timer);
 148     }
 149 }
 150
 151 void qemu_announce_self(void)
 152 {
 153         static QEMUTimer *timer;
 154         timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
 155         qemu_announce_self_once(&timer);
 156 }
 157
 158 /***********************************************************/
 159 /* savevm/loadvm support */
 160
 161 #define IO_BUF_SIZE 32768
 162
 163 struct QEMUFile {
 164     QEMUFilePutBufferFunc *put_buffer;
 165     QEMUFileGetBufferFunc *get_buffer;
 166     QEMUFileCloseFunc *close;
 167     QEMUFileRateLimit *rate_limit;
 168     QEMUFileSetRateLimit *set_rate_limit;
 169     QEMUFileGetRateLimit *get_rate_limit;
 170     void *opaque;
 171     int is_write;
 172
 173     int64_t buf_offset; /* start of buffer when writing, end of buffer
 174                            when reading */
 175     int buf_index;
 176     int buf_size; /* 0 when writing */
 177     uint8_t buf[IO_BUF_SIZE];
 178
 179     int has_error;
 180 };
 181
 182 typedef struct QEMUFileStdio
 183 {
 184     FILE *stdio_file;
 185     QEMUFile *file;
 186 } QEMUFileStdio;
 187
 188 typedef struct QEMUFileSocket
 189 {
 190     int fd;
 191     QEMUFile *file;
 192 } QEMUFileSocket;
 193
 194 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 195 {
 196     QEMUFileSocket *s = opaque;
 197     ssize_t len;
 198
 199     do {
 200         len = recv(s->fd, (void *)buf, size, 0);
 201     } while (len == -1 && socket_error() == EINTR);
 202
 203     if (len == -1)
 204         len = -socket_error();
 205
 206     return len;
 207 }
 208
 209 static int socket_close(void *opaque)
 210 {
 211     QEMUFileSocket *s = opaque;
 212     qemu_free(s);
 213     return 0;
 214 }
 215
 216 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 217 {
 218     QEMUFileStdio *s = opaque;
 219     return fwrite(buf, 1, size, s->stdio_file);
 220 }
 221
 222 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 223 {
 224     QEMUFileStdio *s = opaque;
 225     FILE *fp = s->stdio_file;
 226     int bytes;
 227
 228     do {
 229         clearerr(fp);
 230         bytes = fread(buf, 1, size, fp);
 231     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 232     return bytes;
 233 }
 234
 235 static int stdio_pclose(void *opaque)
 236 {
 237     QEMUFileStdio *s = opaque;
 238     pclose(s->stdio_file);
 239     qemu_free(s);
 240     return 0;
 241 }
 242
 243 static int stdio_fclose(void *opaque)
 244 {
 245     QEMUFileStdio *s = opaque;
 246     fclose(s->stdio_file);
 247     qemu_free(s);
 248     return 0;
 249 }
 250
 251 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 252 {
 253     QEMUFileStdio *s;
 254
 255     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 256         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 257         return NULL;
 258     }
 259
 260     s = qemu_mallocz(sizeof(QEMUFileStdio));
 261
 262     s->stdio_file = stdio_file;
 263
 264     if(mode[0] == 'r') {
 265         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 266                                  NULL, NULL, NULL);
 267     } else {
 268         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 269                                  NULL, NULL, NULL);
 270     }
 271     return s->file;
 272 }
 273
 274 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 275 {
 276     FILE *popen_file;
 277
 278     popen_file = popen(command, mode);
 279     if(popen_file == NULL) {
 280         return NULL;
 281     }
 282
 283     return qemu_popen(popen_file, mode);
 284 }
 285
 286 int qemu_stdio_fd(QEMUFile *f)
 287 {
 288     QEMUFileStdio *p;
 289     int fd;
 290
 291     p = (QEMUFileStdio *)f->opaque;
 292     fd = fileno(p->stdio_file);
 293
 294     return fd;
 295 }
 296
 297 QEMUFile *qemu_fdopen(int fd, const char *mode)
 298 {
 299     QEMUFileStdio *s;
 300
 301     if (mode == NULL ||
 302         (mode[0] != 'r' && mode[0] != 'w') ||
 303         mode[1] != 'b' || mode[2] != 0) {
 304         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 305         return NULL;
 306     }
 307
 308     s = qemu_mallocz(sizeof(QEMUFileStdio));
 309     s->stdio_file = fdopen(fd, mode);
 310     if (!s->stdio_file)
 311         goto fail;
 312
 313     if(mode[0] == 'r') {
 314         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 315                                  NULL, NULL, NULL);
 316     } else {
 317         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 318                                  NULL, NULL, NULL);
 319     }
 320     return s->file;
 321
 322 fail:
 323     qemu_free(s);
 324     return NULL;
 325 }
 326
 327 QEMUFile *qemu_fopen_socket(int fd)
 328 {
 329     QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 330
 331     s->fd = fd;
 332     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 333                              NULL, NULL, NULL);
 334     return s->file;
 335 }
 336
 337 static int file_put_buffer(void *opaque, const uint8_t *buf,
 338                             int64_t pos, int size)
 339 {
 340     QEMUFileStdio *s = opaque;
 341     fseek(s->stdio_file, pos, SEEK_SET);
 342     fwrite(buf, 1, size, s->stdio_file);
 343     return size;
 344 }
 345
 346 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 347 {
 348     QEMUFileStdio *s = opaque;
 349     fseek(s->stdio_file, pos, SEEK_SET);
 350     return fread(buf, 1, size, s->stdio_file);
 351 }
 352
 353 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 354 {
 355     QEMUFileStdio *s;
 356
 357     if (mode == NULL ||
 358         (mode[0] != 'r' && mode[0] != 'w') ||
 359         mode[1] != 'b' || mode[2] != 0) {
 360         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 361         return NULL;
 362     }
 363
 364     s = qemu_mallocz(sizeof(QEMUFileStdio));
 365
 366     s->stdio_file = fopen(filename, mode);
 367     if (!s->stdio_file)
 368         goto fail;
 369
 370     if(mode[0] == 'w') {
 371         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 372                                  NULL, NULL, NULL);
 373     } else {
 374         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 375                                NULL, NULL, NULL);
 376     }
 377     return s->file;
 378 fail:
 379     qemu_free(s);
 380     return NULL;
 381 }
 382
 383 static int block_put_buffer(void *opaque, const uint8_t *buf,
 384                            int64_t pos, int size)
 385 {
 386     bdrv_save_vmstate(opaque, buf, pos, size);
 387     return size;
 388 }
 389
 390 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 391 {
 392     return bdrv_load_vmstate(opaque, buf, pos, size);
 393 }
 394
 395 static int bdrv_fclose(void *opaque)
 396 {
 397     return 0;
 398 }
 399
 400 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 401 {
 402     if (is_writable)
 403         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 404                               NULL, NULL, NULL);
 405     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 406 }
 407
 408 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 409                          QEMUFileGetBufferFunc *get_buffer,
 410                          QEMUFileCloseFunc *close,
 411                          QEMUFileRateLimit *rate_limit,
 412                          QEMUFileSetRateLimit *set_rate_limit,
 413                          QEMUFileGetRateLimit *get_rate_limit)
 414 {
 415     QEMUFile *f;
 416
 417     f = qemu_mallocz(sizeof(QEMUFile));
 418
 419     f->opaque = opaque;
 420     f->put_buffer = put_buffer;
 421     f->get_buffer = get_buffer;
 422     f->close = close;
 423     f->rate_limit = rate_limit;
 424     f->set_rate_limit = set_rate_limit;
 425     f->get_rate_limit = get_rate_limit;
 426     f->is_write = 0;
 427
 428     return f;
 429 }
 430
 431 int qemu_file_has_error(QEMUFile *f)
 432 {
 433     return f->has_error;
 434 }
 435
 436 void qemu_file_set_error(QEMUFile *f)
 437 {
 438     f->has_error = 1;
 439 }
 440
 441 void qemu_fflush(QEMUFile *f)
 442 {
 443     if (!f->put_buffer)
 444         return;
 445
 446     if (f->is_write && f->buf_index > 0) {
 447         int len;
 448
 449         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 450         if (len > 0)
 451             f->buf_offset += f->buf_index;
 452         else
 453             f->has_error = 1;
 454         f->buf_index = 0;
 455     }
 456 }
 457
 458 static void qemu_fill_buffer(QEMUFile *f)
 459 {
 460     int len;
 461
 462     if (!f->get_buffer)
 463         return;
 464
 465     if (f->is_write)
 466         abort();
 467
 468     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 469     if (len > 0) {
 470         f->buf_index = 0;
 471         f->buf_size = len;
 472         f->buf_offset += len;
 473     } else if (len != -EAGAIN)
 474         f->has_error = 1;
 475 }
 476
 477 int qemu_fclose(QEMUFile *f)
 478 {
 479     int ret = 0;
 480     qemu_fflush(f);
 481     if (f->close)
 482         ret = f->close(f->opaque);
 483     qemu_free(f);
 484     return ret;
 485 }
 486
 487 void qemu_file_put_notify(QEMUFile *f)
 488 {
 489     f->put_buffer(f->opaque, NULL, 0, 0);
 490 }
 491
 492 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 493 {
 494     int l;
 495
 496     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 497         fprintf(stderr,
 498                 "Attempted to write to buffer while read buffer is not empty\n");
 499         abort();
 500     }
 501
 502     while (!f->has_error && size > 0) {
 503         l = IO_BUF_SIZE - f->buf_index;
 504         if (l > size)
 505             l = size;
 506         memcpy(f->buf + f->buf_index, buf, l);
 507         f->is_write = 1;
 508         f->buf_index += l;
 509         buf += l;
 510         size -= l;
 511         if (f->buf_index >= IO_BUF_SIZE)
 512             qemu_fflush(f);
 513     }
 514 }
 515
 516 void qemu_put_byte(QEMUFile *f, int v)
 517 {
 518     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 519         fprintf(stderr,
 520                 "Attempted to write to buffer while read buffer is not empty\n");
 521         abort();
 522     }
 523
 524     f->buf[f->buf_index++] = v;
 525     f->is_write = 1;
 526     if (f->buf_index >= IO_BUF_SIZE)
 527         qemu_fflush(f);
 528 }
 529
 530 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 531 {
 532     int size, l;
 533
 534     if (f->is_write)
 535         abort();
 536
 537     size = size1;
 538     while (size > 0) {
 539         l = f->buf_size - f->buf_index;
 540         if (l == 0) {
 541             qemu_fill_buffer(f);
 542             l = f->buf_size - f->buf_index;
 543             if (l == 0)
 544                 break;
 545         }
 546         if (l > size)
 547             l = size;
 548         memcpy(buf, f->buf + f->buf_index, l);
 549         f->buf_index += l;
 550         buf += l;
 551         size -= l;
 552     }
 553     return size1 - size;
 554 }
 555
 556 int qemu_get_byte(QEMUFile *f)
 557 {
 558     if (f->is_write)
 559         abort();
 560
 561     if (f->buf_index >= f->buf_size) {
 562         qemu_fill_buffer(f);
 563         if (f->buf_index >= f->buf_size)
 564             return 0;
 565     }
 566     return f->buf[f->buf_index++];
 567 }
 568
 569 int64_t qemu_ftell(QEMUFile *f)
 570 {
 571     return f->buf_offset - f->buf_size + f->buf_index;
 572 }
 573
 574 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 575 {
 576     if (whence == SEEK_SET) {
 577         /* nothing to do */
 578     } else if (whence == SEEK_CUR) {
 579         pos += qemu_ftell(f);
 580     } else {
 581         /* SEEK_END not supported */
 582         return -1;
 583     }
 584     if (f->put_buffer) {
 585         qemu_fflush(f);
 586         f->buf_offset = pos;
 587     } else {
 588         f->buf_offset = pos;
 589         f->buf_index = 0;
 590         f->buf_size = 0;
 591     }
 592     return pos;
 593 }
 594
 595 int qemu_file_rate_limit(QEMUFile *f)
 596 {
 597     if (f->rate_limit)
 598         return f->rate_limit(f->opaque);
 599
 600     return 0;
 601 }
 602
 603 size_t qemu_file_get_rate_limit(QEMUFile *f)
 604 {
 605     if (f->get_rate_limit)
 606         return f->get_rate_limit(f->opaque);
 607
 608     return 0;
 609 }
 610
 611 size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
 612 {
 613     /* any failed or completed migration keeps its state to allow probing of
 614      * migration data, but has no associated file anymore */
 615     if (f && f->set_rate_limit)
 616         return f->set_rate_limit(f->opaque, new_rate);
 617
 618     return 0;
 619 }
 620
 621 void qemu_put_be16(QEMUFile *f, unsigned int v)
 622 {
 623     qemu_put_byte(f, v >> 8);
 624     qemu_put_byte(f, v);
 625 }
 626
 627 void qemu_put_be32(QEMUFile *f, unsigned int v)
 628 {
 629     qemu_put_byte(f, v >> 24);
 630     qemu_put_byte(f, v >> 16);
 631     qemu_put_byte(f, v >> 8);
 632     qemu_put_byte(f, v);
 633 }
 634
 635 void qemu_put_be64(QEMUFile *f, uint64_t v)
 636 {
 637     qemu_put_be32(f, v >> 32);
 638     qemu_put_be32(f, v);
 639 }
 640
 641 unsigned int qemu_get_be16(QEMUFile *f)
 642 {
 643     unsigned int v;
 644     v = qemu_get_byte(f) << 8;
 645     v |= qemu_get_byte(f);
 646     return v;
 647 }
 648
 649 unsigned int qemu_get_be32(QEMUFile *f)
 650 {
 651     unsigned int v;
 652     v = qemu_get_byte(f) << 24;
 653     v |= qemu_get_byte(f) << 16;
 654     v |= qemu_get_byte(f) << 8;
 655     v |= qemu_get_byte(f);
 656     return v;
 657 }
 658
 659 uint64_t qemu_get_be64(QEMUFile *f)
 660 {
 661     uint64_t v;
 662     v = (uint64_t)qemu_get_be32(f) << 32;
 663     v |= qemu_get_be32(f);
 664     return v;
 665 }
 666
 667 /* 8 bit int */
 668
 669 static int get_int8(QEMUFile *f, void *pv, size_t size)
 670 {
 671     int8_t *v = pv;
 672     qemu_get_s8s(f, v);
 673     return 0;
 674 }
 675
 676 static void put_int8(QEMUFile *f, void *pv, size_t size)
 677 {
 678     int8_t *v = pv;
 679     qemu_put_s8s(f, v);
 680 }
 681
 682 const VMStateInfo vmstate_info_int8 = {
 683     .name = "int8",
 684     .get  = get_int8,
 685     .put  = put_int8,
 686 };
 687
 688 /* 16 bit int */
 689
 690 static int get_int16(QEMUFile *f, void *pv, size_t size)
 691 {
 692     int16_t *v = pv;
 693     qemu_get_sbe16s(f, v);
 694     return 0;
 695 }
 696
 697 static void put_int16(QEMUFile *f, void *pv, size_t size)
 698 {
 699     int16_t *v = pv;
 700     qemu_put_sbe16s(f, v);
 701 }
 702
 703 const VMStateInfo vmstate_info_int16 = {
 704     .name = "int16",
 705     .get  = get_int16,
 706     .put  = put_int16,
 707 };
 708
 709 /* 32 bit int */
 710
 711 static int get_int32(QEMUFile *f, void *pv, size_t size)
 712 {
 713     int32_t *v = pv;
 714     qemu_get_sbe32s(f, v);
 715     return 0;
 716 }
 717
 718 static void put_int32(QEMUFile *f, void *pv, size_t size)
 719 {
 720     int32_t *v = pv;
 721     qemu_put_sbe32s(f, v);
 722 }
 723
 724 const VMStateInfo vmstate_info_int32 = {
 725     .name = "int32",
 726     .get  = get_int32,
 727     .put  = put_int32,
 728 };
 729
 730 /* 32 bit int. See that the received value is the same than the one
 731    in the field */
 732
 733 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 734 {
 735     int32_t *v = pv;
 736     int32_t v2;
 737     qemu_get_sbe32s(f, &v2);
 738
 739     if (*v == v2)
 740         return 0;
 741     return -EINVAL;
 742 }
 743
 744 const VMStateInfo vmstate_info_int32_equal = {
 745     .name = "int32 equal",
 746     .get  = get_int32_equal,
 747     .put  = put_int32,
 748 };
 749
 750 /* 32 bit int. See that the received value is the less or the same
 751    than the one in the field */
 752
 753 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 754 {
 755     int32_t *old = pv;
 756     int32_t new;
 757     qemu_get_sbe32s(f, &new);
 758
 759     if (*old <= new)
 760         return 0;
 761     return -EINVAL;
 762 }
 763
 764 const VMStateInfo vmstate_info_int32_le = {
 765     .name = "int32 equal",
 766     .get  = get_int32_le,
 767     .put  = put_int32,
 768 };
 769
 770 /* 64 bit int */
 771
 772 static int get_int64(QEMUFile *f, void *pv, size_t size)
 773 {
 774     int64_t *v = pv;
 775     qemu_get_sbe64s(f, v);
 776     return 0;
 777 }
 778
 779 static void put_int64(QEMUFile *f, void *pv, size_t size)
 780 {
 781     int64_t *v = pv;
 782     qemu_put_sbe64s(f, v);
 783 }
 784
 785 const VMStateInfo vmstate_info_int64 = {
 786     .name = "int64",
 787     .get  = get_int64,
 788     .put  = put_int64,
 789 };
 790
 791 /* 8 bit unsigned int */
 792
 793 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 794 {
 795     uint8_t *v = pv;
 796     qemu_get_8s(f, v);
 797     return 0;
 798 }
 799
 800 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 801 {
 802     uint8_t *v = pv;
 803     qemu_put_8s(f, v);
 804 }
 805
 806 const VMStateInfo vmstate_info_uint8 = {
 807     .name = "uint8",
 808     .get  = get_uint8,
 809     .put  = put_uint8,
 810 };
 811
 812 /* 16 bit unsigned int */
 813
 814 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 815 {
 816     uint16_t *v = pv;
 817     qemu_get_be16s(f, v);
 818     return 0;
 819 }
 820
 821 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 822 {
 823     uint16_t *v = pv;
 824     qemu_put_be16s(f, v);
 825 }
 826
 827 const VMStateInfo vmstate_info_uint16 = {
 828     .name = "uint16",
 829     .get  = get_uint16,
 830     .put  = put_uint16,
 831 };
 832
 833 /* 32 bit unsigned int */
 834
 835 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 836 {
 837     uint32_t *v = pv;
 838     qemu_get_be32s(f, v);
 839     return 0;
 840 }
 841
 842 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 843 {
 844     uint32_t *v = pv;
 845     qemu_put_be32s(f, v);
 846 }
 847
 848 const VMStateInfo vmstate_info_uint32 = {
 849     .name = "uint32",
 850     .get  = get_uint32,
 851     .put  = put_uint32,
 852 };
 853
 854 /* 64 bit unsigned int */
 855
 856 static int get_uint64(QEMUFile *f, void *pv, size_t size)
 857 {
 858     uint64_t *v = pv;
 859     qemu_get_be64s(f, v);
 860     return 0;
 861 }
 862
 863 static void put_uint64(QEMUFile *f, void *pv, size_t size)
 864 {
 865     uint64_t *v = pv;
 866     qemu_put_be64s(f, v);
 867 }
 868
 869 const VMStateInfo vmstate_info_uint64 = {
 870     .name = "uint64",
 871     .get  = get_uint64,
 872     .put  = put_uint64,
 873 };
 874
 875 /* 64 bit linux kernel unsigned int */
 876
 877 #ifdef __linux__
 878 static int get_u64(QEMUFile *f, void *pv, size_t size)
 879 {
 880     uint64_t *v = pv;
 881     qemu_get_be64s(f, v);
 882     return 0;
 883 }
 884
 885 static void put_u64(QEMUFile *f, void *pv, size_t size)
 886 {
 887     uint64_t *v = pv;
 888     qemu_put_be64s(f, v);
 889 }
 890
 891 const VMStateInfo vmstate_info_u64 = {
 892     .name = "__u64",
 893     .get  = get_u64,
 894     .put  = put_u64,
 895 };
 896 #endif /* __linux__ */
 897
 898 /* 8 bit int. See that the received value is the same than the one
 899    in the field */
 900
 901 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
 902 {
 903     uint8_t *v = pv;
 904     uint8_t v2;
 905     qemu_get_8s(f, &v2);
 906
 907     if (*v == v2)
 908         return 0;
 909     return -EINVAL;
 910 }
 911
 912 const VMStateInfo vmstate_info_uint8_equal = {
 913     .name = "uint8 equal",
 914     .get  = get_uint8_equal,
 915     .put  = put_uint8,
 916 };
 917
 918 /* 16 bit unsigned int int. See that the received value is the same than the one
 919    in the field */
 920
 921 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 922 {
 923     uint16_t *v = pv;
 924     uint16_t v2;
 925     qemu_get_be16s(f, &v2);
 926
 927     if (*v == v2)
 928         return 0;
 929     return -EINVAL;
 930 }
 931
 932 const VMStateInfo vmstate_info_uint16_equal = {
 933     .name = "uint16 equal",
 934     .get  = get_uint16_equal,
 935     .put  = put_uint16,
 936 };
 937
 938 /* timers  */
 939
 940 static int get_timer(QEMUFile *f, void *pv, size_t size)
 941 {
 942     QEMUTimer *v = pv;
 943     qemu_get_timer(f, v);
 944     return 0;
 945 }
 946
 947 static void put_timer(QEMUFile *f, void *pv, size_t size)
 948 {
 949     QEMUTimer *v = pv;
 950     qemu_put_timer(f, v);
 951 }
 952
 953 const VMStateInfo vmstate_info_timer = {
 954     .name = "timer",
 955     .get  = get_timer,
 956     .put  = put_timer,
 957 };
 958
 959 /* uint8_t buffers */
 960
 961 static int get_buffer(QEMUFile *f, void *pv, size_t size)
 962 {
 963     uint8_t *v = pv;
 964     qemu_get_buffer(f, v, size);
 965     return 0;
 966 }
 967
 968 static void put_buffer(QEMUFile *f, void *pv, size_t size)
 969 {
 970     uint8_t *v = pv;
 971     qemu_put_buffer(f, v, size);
 972 }
 973
 974 const VMStateInfo vmstate_info_buffer = {
 975     .name = "buffer",
 976     .get  = get_buffer,
 977     .put  = put_buffer,
 978 };
 979
 980 /* unused buffers: space that was used for some fields that are
 981    not usefull anymore */
 982
 983 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
 984 {
 985     uint8_t buf[1024];
 986     int block_len;
 987
 988     while (size > 0) {
 989         block_len = MIN(sizeof(buf), size);
 990         size -= block_len;
 991         qemu_get_buffer(f, buf, block_len);
 992     }
 993    return 0;
 994 }
 995
 996 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
 997 {
 998     static const uint8_t buf[1024];
 999     int block_len;
1000
1001     while (size > 0) {
1002         block_len = MIN(sizeof(buf), size);
1003         size -= block_len;
1004         qemu_put_buffer(f, buf, block_len);
1005     }
1006 }
1007
1008 const VMStateInfo vmstate_info_unused_buffer = {
1009     .name = "unused_buffer",
1010     .get  = get_unused_buffer,
1011     .put  = put_unused_buffer,
1012 };
1013
1014 typedef struct SaveStateEntry {
1015     QTAILQ_ENTRY(SaveStateEntry) entry;
1016     char idstr[256];
1017     int instance_id;
1018     int version_id;
1019     int section_id;
1020     SaveSetParamsHandler *set_params;
1021     SaveLiveStateHandler *save_live_state;
1022     SaveStateHandler *save_state;
1023     LoadStateHandler *load_state;
1024     const VMStateDescription *vmsd;
1025     void *opaque;
1026 } SaveStateEntry;
1027
1028
1029 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1030     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1031 static int global_section_id;
1032
1033 static int calculate_new_instance_id(const char *idstr)
1034 {
1035     SaveStateEntry *se;
1036     int instance_id = 0;
1037
1038     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1039         if (strcmp(idstr, se->idstr) == 0
1040             && instance_id <= se->instance_id) {
1041             instance_id = se->instance_id + 1;
1042         }
1043     }
1044     return instance_id;
1045 }
1046
1047 /* TODO: Individual devices generally have very little idea about the rest
1048    of the system, so instance_id should be removed/replaced.
1049    Meanwhile pass -1 as instance_id if you do not already have a clearly
1050    distinguishing id for all instances of your device class. */
1051 int register_savevm_live(const char *idstr,
1052                          int instance_id,
1053                          int version_id,
1054                          SaveSetParamsHandler *set_params,
1055                          SaveLiveStateHandler *save_live_state,
1056                          SaveStateHandler *save_state,
1057                          LoadStateHandler *load_state,
1058                          void *opaque)
1059 {
1060     SaveStateEntry *se;
1061
1062     se = qemu_mallocz(sizeof(SaveStateEntry));
1063     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
1064     se->version_id = version_id;
1065     se->section_id = global_section_id++;
1066     se->set_params = set_params;
1067     se->save_live_state = save_live_state;
1068     se->save_state = save_state;
1069     se->load_state = load_state;
1070     se->opaque = opaque;
1071     se->vmsd = NULL;
1072
1073     if (instance_id == -1) {
1074         se->instance_id = calculate_new_instance_id(idstr);
1075     } else {
1076         se->instance_id = instance_id;
1077     }
1078     /* add at the end of list */
1079     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1080     return 0;
1081 }
1082
1083 int register_savevm(const char *idstr,
1084                     int instance_id,
1085                     int version_id,
1086                     SaveStateHandler *save_state,
1087                     LoadStateHandler *load_state,
1088                     void *opaque)
1089 {
1090     return register_savevm_live(idstr, instance_id, version_id,
1091                                 NULL, NULL, save_state, load_state, opaque);
1092 }
1093
1094 void unregister_savevm(const char *idstr, void *opaque)
1095 {
1096     SaveStateEntry *se, *new_se;
1097
1098     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1099         if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
1100             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1101             qemu_free(se);
1102         }
1103     }
1104 }
1105
1106 int vmstate_register(int instance_id, const VMStateDescription *vmsd,
1107                      void *opaque)
1108 {
1109     SaveStateEntry *se;
1110
1111     se = qemu_mallocz(sizeof(SaveStateEntry));
1112     pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
1113     se->version_id = vmsd->version_id;
1114     se->section_id = global_section_id++;
1115     se->save_live_state = NULL;
1116     se->save_state = NULL;
1117     se->load_state = NULL;
1118     se->opaque = opaque;
1119     se->vmsd = vmsd;
1120
1121     if (instance_id == -1) {
1122         se->instance_id = calculate_new_instance_id(vmsd->name);
1123     } else {
1124         se->instance_id = instance_id;
1125     }
1126     /* add at the end of list */
1127     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1128     return 0;
1129 }
1130
1131 void vmstate_unregister(const VMStateDescription *vmsd, void *opaque)
1132 {
1133     SaveStateEntry *se, *new_se;
1134
1135     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1136         if (se->vmsd == vmsd && se->opaque == opaque) {
1137             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1138             qemu_free(se);
1139         }
1140     }
1141 }
1142
1143 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1144                        void *opaque, int version_id)
1145 {
1146     VMStateField *field = vmsd->fields;
1147
1148     if (version_id > vmsd->version_id) {
1149         return -EINVAL;
1150     }
1151     if (version_id < vmsd->minimum_version_id_old) {
1152         return -EINVAL;
1153     }
1154     if  (version_id < vmsd->minimum_version_id) {
1155         return vmsd->load_state_old(f, opaque, version_id);
1156     }
1157     if (vmsd->pre_load) {
1158         int ret = vmsd->pre_load(opaque);
1159         if (ret)
1160             return ret;
1161     }
1162     while(field->name) {
1163         if ((field->field_exists &&
1164              field->field_exists(opaque, version_id)) ||
1165             (!field->field_exists &&
1166              field->version_id <= version_id)) {
1167             void *base_addr = opaque + field->offset;
1168             int ret, i, n_elems = 1;
1169             int size = field->size;
1170
1171             if (field->flags & VMS_VBUFFER) {
1172                 size = *(int32_t *)(opaque+field->size_offset);
1173                 if (field->flags & VMS_MULTIPLY) {
1174                     size *= field->size;
1175                 }
1176             }
1177             if (field->flags & VMS_ARRAY) {
1178                 n_elems = field->num;
1179             } else if (field->flags & VMS_VARRAY_INT32) {
1180                 n_elems = *(int32_t *)(opaque+field->num_offset);
1181             } else if (field->flags & VMS_VARRAY_UINT16) {
1182                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1183             }
1184             if (field->flags & VMS_POINTER) {
1185                 base_addr = *(void **)base_addr + field->start;
1186             }
1187             for (i = 0; i < n_elems; i++) {
1188                 void *addr = base_addr + size * i;
1189
1190                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1191                     addr = *(void **)addr;
1192                 }
1193                 if (field->flags & VMS_STRUCT) {
1194                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1195                 } else {
1196                     ret = field->info->get(f, addr, size);
1197
1198                 }
1199                 if (ret < 0) {
1200                     return ret;
1201                 }
1202             }
1203         }
1204         field++;
1205     }
1206     if (vmsd->post_load) {
1207         return vmsd->post_load(opaque, version_id);
1208     }
1209     return 0;
1210 }
1211
1212 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1213                         void *opaque)
1214 {
1215     VMStateField *field = vmsd->fields;
1216
1217     if (vmsd->pre_save) {
1218         vmsd->pre_save(opaque);
1219     }
1220     while(field->name) {
1221         if (!field->field_exists ||
1222             field->field_exists(opaque, vmsd->version_id)) {
1223             void *base_addr = opaque + field->offset;
1224             int i, n_elems = 1;
1225             int size = field->size;
1226
1227             if (field->flags & VMS_VBUFFER) {
1228                 size = *(int32_t *)(opaque+field->size_offset);
1229                 if (field->flags & VMS_MULTIPLY) {
1230                     size *= field->size;
1231                 }
1232             }
1233             if (field->flags & VMS_ARRAY) {
1234                 n_elems = field->num;
1235             } else if (field->flags & VMS_VARRAY_INT32) {
1236                 n_elems = *(int32_t *)(opaque+field->num_offset);
1237             } else if (field->flags & VMS_VARRAY_UINT16) {
1238                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1239             }
1240             if (field->flags & VMS_POINTER) {
1241                 base_addr = *(void **)base_addr + field->start;
1242             }
1243             for (i = 0; i < n_elems; i++) {
1244                 void *addr = base_addr + size * i;
1245
1246                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1247                     addr = *(void **)addr;
1248                 }
1249                 if (field->flags & VMS_STRUCT) {
1250                     vmstate_save_state(f, field->vmsd, addr);
1251                 } else {
1252                     field->info->put(f, addr, size);
1253                 }
1254             }
1255         }
1256         field++;
1257     }
1258     if (vmsd->post_save) {
1259         vmsd->post_save(opaque);
1260     }
1261 }
1262
1263 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1264 {
1265     if (!se->vmsd) {         /* Old style */
1266         return se->load_state(f, se->opaque, version_id);
1267     }
1268     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1269 }
1270
1271 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1272 {
1273     if (!se->vmsd) {         /* Old style */
1274         se->save_state(f, se->opaque);
1275         return;
1276     }
1277     vmstate_save_state(f,se->vmsd, se->opaque);
1278 }
1279
1280 #define QEMU_VM_FILE_MAGIC           0x5145564d
1281 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1282 #define QEMU_VM_FILE_VERSION         0x00000003
1283
1284 #define QEMU_VM_EOF                  0x00
1285 #define QEMU_VM_SECTION_START        0x01
1286 #define QEMU_VM_SECTION_PART         0x02
1287 #define QEMU_VM_SECTION_END          0x03
1288 #define QEMU_VM_SECTION_FULL         0x04
1289
1290 int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
1291                             int shared)
1292 {
1293     SaveStateEntry *se;
1294
1295     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1296         if(se->set_params == NULL) {
1297             continue;
1298         }
1299         se->set_params(blk_enable, shared, se->opaque);
1300     }
1301
1302     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1303     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1304
1305     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1306         int len;
1307
1308         if (se->save_live_state == NULL)
1309             continue;
1310
1311         /* Section type */
1312         qemu_put_byte(f, QEMU_VM_SECTION_START);
1313         qemu_put_be32(f, se->section_id);
1314
1315         /* ID string */
1316         len = strlen(se->idstr);
1317         qemu_put_byte(f, len);
1318         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1319
1320         qemu_put_be32(f, se->instance_id);
1321         qemu_put_be32(f, se->version_id);
1322
1323         se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
1324     }
1325
1326     if (qemu_file_has_error(f)) {
1327         qemu_savevm_state_cancel(mon, f);
1328         return -EIO;
1329     }
1330
1331     return 0;
1332 }
1333
1334 int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
1335 {
1336     SaveStateEntry *se;
1337     int ret = 1;
1338
1339     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1340         if (se->save_live_state == NULL)
1341             continue;
1342
1343         /* Section type */
1344         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1345         qemu_put_be32(f, se->section_id);
1346
1347         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
1348         if (!ret) {
1349             /* Do not proceed to the next vmstate before this one reported
1350                completion of the current stage. This serializes the migration
1351                and reduces the probability that a faster changing state is
1352                synchronized over and over again. */
1353             break;
1354         }
1355     }
1356
1357     if (ret)
1358         return 1;
1359
1360     if (qemu_file_has_error(f)) {
1361         qemu_savevm_state_cancel(mon, f);
1362         return -EIO;
1363     }
1364
1365     return 0;
1366 }
1367
1368 int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
1369 {
1370     SaveStateEntry *se;
1371
1372     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1373         if (se->save_live_state == NULL)
1374             continue;
1375
1376         /* Section type */
1377         qemu_put_byte(f, QEMU_VM_SECTION_END);
1378         qemu_put_be32(f, se->section_id);
1379
1380         se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
1381     }
1382
1383     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1384         int len;
1385
1386         if (se->save_state == NULL && se->vmsd == NULL)
1387             continue;
1388
1389         /* Section type */
1390         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1391         qemu_put_be32(f, se->section_id);
1392
1393         /* ID string */
1394         len = strlen(se->idstr);
1395         qemu_put_byte(f, len);
1396         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1397
1398         qemu_put_be32(f, se->instance_id);
1399         qemu_put_be32(f, se->version_id);
1400
1401         vmstate_save(f, se);
1402     }
1403
1404     qemu_put_byte(f, QEMU_VM_EOF);
1405
1406     if (qemu_file_has_error(f))
1407         return -EIO;
1408
1409     return 0;
1410 }
1411
1412 void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1413 {
1414     SaveStateEntry *se;
1415
1416     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1417         if (se->save_live_state) {
1418             se->save_live_state(mon, f, -1, se->opaque);
1419         }
1420     }
1421 }
1422
1423 static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
1424 {
1425     int saved_vm_running;
1426     int ret;
1427
1428     saved_vm_running = vm_running;
1429     vm_stop(0);
1430
1431     bdrv_flush_all();
1432
1433     ret = qemu_savevm_state_begin(mon, f, 0, 0);
1434     if (ret < 0)
1435         goto out;
1436
1437     do {
1438         ret = qemu_savevm_state_iterate(mon, f);
1439         if (ret < 0)
1440             goto out;
1441     } while (ret == 0);
1442
1443     ret = qemu_savevm_state_complete(mon, f);
1444
1445 out:
1446     if (qemu_file_has_error(f))
1447         ret = -EIO;
1448
1449     if (!ret && saved_vm_running)
1450         vm_start();
1451
1452     return ret;
1453 }
1454
1455 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1456 {
1457     SaveStateEntry *se;
1458
1459     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1460         if (!strcmp(se->idstr, idstr) &&
1461             instance_id == se->instance_id)
1462             return se;
1463     }
1464     return NULL;
1465 }
1466
1467 typedef struct LoadStateEntry {
1468     QLIST_ENTRY(LoadStateEntry) entry;
1469     SaveStateEntry *se;
1470     int section_id;
1471     int version_id;
1472 } LoadStateEntry;
1473
1474 int qemu_loadvm_state(QEMUFile *f)
1475 {
1476     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1477         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1478     LoadStateEntry *le, *new_le;
1479     uint8_t section_type;
1480     unsigned int v;
1481     int ret;
1482
1483     v = qemu_get_be32(f);
1484     if (v != QEMU_VM_FILE_MAGIC)
1485         return -EINVAL;
1486
1487     v = qemu_get_be32(f);
1488     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1489         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1490         return -ENOTSUP;
1491     }
1492     if (v != QEMU_VM_FILE_VERSION)
1493         return -ENOTSUP;
1494
1495     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1496         uint32_t instance_id, version_id, section_id;
1497         SaveStateEntry *se;
1498         char idstr[257];
1499         int len;
1500
1501         switch (section_type) {
1502         case QEMU_VM_SECTION_START:
1503         case QEMU_VM_SECTION_FULL:
1504             /* Read section start */
1505             section_id = qemu_get_be32(f);
1506             len = qemu_get_byte(f);
1507             qemu_get_buffer(f, (uint8_t *)idstr, len);
1508             idstr[len] = 0;
1509             instance_id = qemu_get_be32(f);
1510             version_id = qemu_get_be32(f);
1511
1512             /* Find savevm section */
1513             se = find_se(idstr, instance_id);
1514             if (se == NULL) {
1515                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1516                 ret = -EINVAL;
1517                 goto out;
1518             }
1519
1520             /* Validate version */
1521             if (version_id > se->version_id) {
1522                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1523                         version_id, idstr, se->version_id);
1524                 ret = -EINVAL;
1525                 goto out;
1526             }
1527
1528             /* Add entry */
1529             le = qemu_mallocz(sizeof(*le));
1530
1531             le->se = se;
1532             le->section_id = section_id;
1533             le->version_id = version_id;
1534             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1535
1536             ret = vmstate_load(f, le->se, le->version_id);
1537             if (ret < 0) {
1538                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1539                         instance_id, idstr);
1540                 goto out;
1541             }
1542             break;
1543         case QEMU_VM_SECTION_PART:
1544         case QEMU_VM_SECTION_END:
1545             section_id = qemu_get_be32(f);
1546
1547             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1548                 if (le->section_id == section_id) {
1549                     break;
1550                 }
1551             }
1552             if (le == NULL) {
1553                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1554                 ret = -EINVAL;
1555                 goto out;
1556             }
1557
1558             ret = vmstate_load(f, le->se, le->version_id);
1559             if (ret < 0) {
1560                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1561                         section_id);
1562                 goto out;
1563             }
1564             break;
1565         default:
1566             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1567             ret = -EINVAL;
1568             goto out;
1569         }
1570     }
1571
1572     ret = 0;
1573
1574 out:
1575     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1576         QLIST_REMOVE(le, entry);
1577         qemu_free(le);
1578     }
1579
1580     if (qemu_file_has_error(f))
1581         ret = -EIO;
1582
1583     return ret;
1584 }
1585
1586 /* device can contain snapshots */
1587 static int bdrv_can_snapshot(BlockDriverState *bs)
1588 {
1589     return (bs &&
1590             !bdrv_is_removable(bs) &&
1591             !bdrv_is_read_only(bs));
1592 }
1593
1594 /* device must be snapshots in order to have a reliable snapshot */
1595 static int bdrv_has_snapshot(BlockDriverState *bs)
1596 {
1597     return (bs &&
1598             !bdrv_is_removable(bs) &&
1599             !bdrv_is_read_only(bs));
1600 }
1601
1602 static BlockDriverState *get_bs_snapshots(void)
1603 {
1604     BlockDriverState *bs;
1605     DriveInfo *dinfo;
1606
1607     if (bs_snapshots)
1608         return bs_snapshots;
1609     QTAILQ_FOREACH(dinfo, &drives, next) {
1610         bs = dinfo->bdrv;
1611         if (bdrv_can_snapshot(bs))
1612             goto ok;
1613     }
1614     return NULL;
1615  ok:
1616     bs_snapshots = bs;
1617     return bs;
1618 }
1619
1620 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1621                               const char *name)
1622 {
1623     QEMUSnapshotInfo *sn_tab, *sn;
1624     int nb_sns, i, ret;
1625
1626     ret = -ENOENT;
1627     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1628     if (nb_sns < 0)
1629         return ret;
1630     for(i = 0; i < nb_sns; i++) {
1631         sn = &sn_tab[i];
1632         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
1633             *sn_info = *sn;
1634             ret = 0;
1635             break;
1636         }
1637     }
1638     qemu_free(sn_tab);
1639     return ret;
1640 }
1641
1642 /*
1643  * Deletes snapshots of a given name in all opened images.
1644  */
1645 static int del_existing_snapshots(Monitor *mon, const char *name)
1646 {
1647     BlockDriverState *bs;
1648     DriveInfo *dinfo;
1649     QEMUSnapshotInfo sn1, *snapshot = &sn1;
1650     int ret;
1651
1652     QTAILQ_FOREACH(dinfo, &drives, next) {
1653         bs = dinfo->bdrv;
1654         if (bdrv_can_snapshot(bs) &&
1655             bdrv_snapshot_find(bs, snapshot, name) >= 0)
1656         {
1657             ret = bdrv_snapshot_delete(bs, name);
1658             if (ret < 0) {
1659                 monitor_printf(mon,
1660                                "Error while deleting snapshot on '%s'\n",
1661                                bdrv_get_device_name(bs));
1662                 return -1;
1663             }
1664         }
1665     }
1666
1667     return 0;
1668 }
1669
1670 void do_savevm(Monitor *mon, const QDict *qdict)
1671 {
1672     DriveInfo *dinfo;
1673     BlockDriverState *bs, *bs1;
1674     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1675     int ret;
1676     QEMUFile *f;
1677     int saved_vm_running;
1678     uint32_t vm_state_size;
1679 #ifdef _WIN32
1680     struct _timeb tb;
1681 #else
1682     struct timeval tv;
1683 #endif
1684     const char *name = qdict_get_try_str(qdict, "name");
1685
1686     bs = get_bs_snapshots();
1687     if (!bs) {
1688         monitor_printf(mon, "No block device can accept snapshots\n");
1689         return;
1690     }
1691
1692     /* ??? Should this occur after vm_stop?  */
1693     qemu_aio_flush();
1694
1695     saved_vm_running = vm_running;
1696     vm_stop(0);
1697
1698     memset(sn, 0, sizeof(*sn));
1699     if (name) {
1700         ret = bdrv_snapshot_find(bs, old_sn, name);
1701         if (ret >= 0) {
1702             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1703             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1704         } else {
1705             pstrcpy(sn->name, sizeof(sn->name), name);
1706         }
1707     }
1708
1709     /* fill auxiliary fields */
1710 #ifdef _WIN32
1711     _ftime(&tb);
1712     sn->date_sec = tb.time;
1713     sn->date_nsec = tb.millitm * 1000000;
1714 #else
1715     gettimeofday(&tv, NULL);
1716     sn->date_sec = tv.tv_sec;
1717     sn->date_nsec = tv.tv_usec * 1000;
1718 #endif
1719     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1720
1721     /* Delete old snapshots of the same name */
1722     if (del_existing_snapshots(mon, name) < 0) {
1723         goto the_end;
1724     }
1725
1726     /* save the VM state */
1727     f = qemu_fopen_bdrv(bs, 1);
1728     if (!f) {
1729         monitor_printf(mon, "Could not open VM state file\n");
1730         goto the_end;
1731     }
1732     ret = qemu_savevm_state(mon, f);
1733     vm_state_size = qemu_ftell(f);
1734     qemu_fclose(f);
1735     if (ret < 0) {
1736         monitor_printf(mon, "Error %d while writing VM\n", ret);
1737         goto the_end;
1738     }
1739
1740     /* create the snapshots */
1741
1742     QTAILQ_FOREACH(dinfo, &drives, next) {
1743         bs1 = dinfo->bdrv;
1744         if (bdrv_has_snapshot(bs1)) {
1745             /* Write VM state size only to the image that contains the state */
1746             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1747             ret = bdrv_snapshot_create(bs1, sn);
1748             if (ret < 0) {
1749                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1750                                bdrv_get_device_name(bs1));
1751             }
1752         }
1753     }
1754
1755  the_end:
1756     if (saved_vm_running)
1757         vm_start();
1758 }
1759
1760 int load_vmstate(Monitor *mon, const char *name)
1761 {
1762     DriveInfo *dinfo;
1763     BlockDriverState *bs, *bs1;
1764     QEMUSnapshotInfo sn;
1765     QEMUFile *f;
1766     int ret;
1767
1768     bs = get_bs_snapshots();
1769     if (!bs) {
1770         monitor_printf(mon, "No block device supports snapshots\n");
1771         return -EINVAL;
1772     }
1773
1774     /* Flush all IO requests so they don't interfere with the new state.  */
1775     qemu_aio_flush();
1776
1777     QTAILQ_FOREACH(dinfo, &drives, next) {
1778         bs1 = dinfo->bdrv;
1779         if (bdrv_has_snapshot(bs1)) {
1780             ret = bdrv_snapshot_goto(bs1, name);
1781             if (ret < 0) {
1782                 if (bs != bs1)
1783                     monitor_printf(mon, "Warning: ");
1784                 switch(ret) {
1785                 case -ENOTSUP:
1786                     monitor_printf(mon,
1787                                    "Snapshots not supported on device '%s'\n",
1788                                    bdrv_get_device_name(bs1));
1789                     break;
1790                 case -ENOENT:
1791                     monitor_printf(mon, "Could not find snapshot '%s' on "
1792                                    "device '%s'\n",
1793                                    name, bdrv_get_device_name(bs1));
1794                     break;
1795                 default:
1796                     monitor_printf(mon, "Error %d while activating snapshot on"
1797                                    " '%s'\n", ret, bdrv_get_device_name(bs1));
1798                     break;
1799                 }
1800                 /* fatal on snapshot block device */
1801                 if (bs == bs1)
1802                     return 0;
1803             }
1804         }
1805     }
1806
1807     /* Don't even try to load empty VM states */
1808     ret = bdrv_snapshot_find(bs, &sn, name);
1809     if ((ret >= 0) && (sn.vm_state_size == 0))
1810         return -EINVAL;
1811
1812     /* restore the VM state */
1813     f = qemu_fopen_bdrv(bs, 0);
1814     if (!f) {
1815         monitor_printf(mon, "Could not open VM state file\n");
1816         return -EINVAL;
1817     }
1818     ret = qemu_loadvm_state(f);
1819     qemu_fclose(f);
1820     if (ret < 0) {
1821         monitor_printf(mon, "Error %d while loading VM state\n", ret);
1822         return ret;
1823     }
1824     return 0;
1825 }
1826
1827 void do_delvm(Monitor *mon, const QDict *qdict)
1828 {
1829     DriveInfo *dinfo;
1830     BlockDriverState *bs, *bs1;
1831     int ret;
1832     const char *name = qdict_get_str(qdict, "name");
1833
1834     bs = get_bs_snapshots();
1835     if (!bs) {
1836         monitor_printf(mon, "No block device supports snapshots\n");
1837         return;
1838     }
1839
1840     QTAILQ_FOREACH(dinfo, &drives, next) {
1841         bs1 = dinfo->bdrv;
1842         if (bdrv_has_snapshot(bs1)) {
1843             ret = bdrv_snapshot_delete(bs1, name);
1844             if (ret < 0) {
1845                 if (ret == -ENOTSUP)
1846                     monitor_printf(mon,
1847                                    "Snapshots not supported on device '%s'\n",
1848                                    bdrv_get_device_name(bs1));
1849                 else
1850                     monitor_printf(mon, "Error %d while deleting snapshot on "
1851                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1852             }
1853         }
1854     }
1855 }
1856
1857 void do_info_snapshots(Monitor *mon)
1858 {
1859     DriveInfo *dinfo;
1860     BlockDriverState *bs, *bs1;
1861     QEMUSnapshotInfo *sn_tab, *sn;
1862     int nb_sns, i;
1863     char buf[256];
1864
1865     bs = get_bs_snapshots();
1866     if (!bs) {
1867         monitor_printf(mon, "No available block device supports snapshots\n");
1868         return;
1869     }
1870     monitor_printf(mon, "Snapshot devices:");
1871     QTAILQ_FOREACH(dinfo, &drives, next) {
1872         bs1 = dinfo->bdrv;
1873         if (bdrv_has_snapshot(bs1)) {
1874             if (bs == bs1)
1875                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1876         }
1877     }
1878     monitor_printf(mon, "\n");
1879
1880     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1881     if (nb_sns < 0) {
1882         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1883         return;
1884     }
1885     monitor_printf(mon, "Snapshot list (from %s):\n",
1886                    bdrv_get_device_name(bs));
1887     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1888     for(i = 0; i < nb_sns; i++) {
1889         sn = &sn_tab[i];
1890         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1891     }
1892     qemu_free(sn_tab);
1893 }