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
  25 #include "config-host.h"
  26 #include "qemu-common.h"
  27 #include "hw/hw.h"
  28 #include "hw/qdev.h"
  29 #include "net/net.h"
  30 #include "monitor/monitor.h"
  31 #include "sysemu/sysemu.h"
  32 #include "qemu/timer.h"
  33 #include "audio/audio.h"
  34 #include "migration/migration.h"
  35 #include "qemu/sockets.h"
  36 #include "qemu/queue.h"
  37 #include "sysemu/cpus.h"
  38 #include "exec/memory.h"
  39 #include "qmp-commands.h"
  40 #include "trace.h"
  41 #include "qemu/bitops.h"
  42
  43 #define SELF_ANNOUNCE_ROUNDS 5
  44
  45 #ifndef ETH_P_RARP
  46 #define ETH_P_RARP 0x8035
  47 #endif
  48 #define ARP_HTYPE_ETH 0x0001
  49 #define ARP_PTYPE_IP 0x0800
  50 #define ARP_OP_REQUEST_REV 0x3
  51
  52 static int announce_self_create(uint8_t *buf,
  53                                 uint8_t *mac_addr)
  54 {
  55     /* Ethernet header. */
  56     memset(buf, 0xff, 6);         /* destination MAC addr */
  57     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
  58     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
  59
  60     /* RARP header. */
  61     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
  62     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
  63     *(buf + 18) = 6; /* hardware addr length (ethernet) */
  64     *(buf + 19) = 4; /* protocol addr length (IPv4) */
  65     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
  66     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
  67     memset(buf + 28, 0x00, 4);     /* source protocol addr */
  68     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
  69     memset(buf + 38, 0x00, 4);     /* target protocol addr */
  70
  71     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
  72     memset(buf + 42, 0x00, 18);
  73
  74     return 60; /* len (FCS will be added by hardware) */
  75 }
  76
  77 static void qemu_announce_self_iter(NICState *nic, void *opaque)
  78 {
  79     uint8_t buf[60];
  80     int len;
  81
  82     len = announce_self_create(buf, nic->conf->macaddr.a);
  83
  84     qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
  85 }
  86
  87
  88 static void qemu_announce_self_once(void *opaque)
  89 {
  90     static int count = SELF_ANNOUNCE_ROUNDS;
  91     QEMUTimer *timer = *(QEMUTimer **)opaque;
  92
  93     qemu_foreach_nic(qemu_announce_self_iter, NULL);
  94
  95     if (--count) {
  96         /* delay 50ms, 150ms, 250ms, ... */
  97         qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
  98                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
  99     } else {
 100             qemu_del_timer(timer);
 101             qemu_free_timer(timer);
 102     }
 103 }
 104
 105 void qemu_announce_self(void)
 106 {
 107         static QEMUTimer *timer;
 108         timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
 109         qemu_announce_self_once(&timer);
 110 }
 111
 112 /***********************************************************/
 113 /* savevm/loadvm support */
 114
 115 #define IO_BUF_SIZE 32768
 116
 117 struct QEMUFile {
 118     const QEMUFileOps *ops;
 119     void *opaque;
 120     int is_write;
 121
 122     int64_t buf_offset; /* start of buffer when writing, end of buffer
 123                            when reading */
 124     int buf_index;
 125     int buf_size; /* 0 when writing */
 126     uint8_t buf[IO_BUF_SIZE];
 127
 128     int last_error;
 129 };
 130
 131 typedef struct QEMUFileStdio
 132 {
 133     FILE *stdio_file;
 134     QEMUFile *file;
 135 } QEMUFileStdio;
 136
 137 typedef struct QEMUFileSocket
 138 {
 139     int fd;
 140     QEMUFile *file;
 141 } QEMUFileSocket;
 142
 143 typedef struct {
 144     Coroutine *co;
 145     int fd;
 146 } FDYieldUntilData;
 147
 148 static void fd_coroutine_enter(void *opaque)
 149 {
 150     FDYieldUntilData *data = opaque;
 151     qemu_set_fd_handler(data->fd, NULL, NULL, NULL);
 152     qemu_coroutine_enter(data->co, NULL);
 153 }
 154
 155 /**
 156  * Yield until a file descriptor becomes readable
 157  *
 158  * Note that this function clobbers the handlers for the file descriptor.
 159  */
 160 static void coroutine_fn yield_until_fd_readable(int fd)
 161 {
 162     FDYieldUntilData data;
 163
 164     assert(qemu_in_coroutine());
 165     data.co = qemu_coroutine_self();
 166     data.fd = fd;
 167     qemu_set_fd_handler(fd, fd_coroutine_enter, NULL, &data);
 168     qemu_coroutine_yield();
 169 }
 170
 171 static int socket_get_fd(void *opaque)
 172 {
 173     QEMUFileSocket *s = opaque;
 174
 175     return s->fd;
 176 }
 177
 178 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 179 {
 180     QEMUFileSocket *s = opaque;
 181     ssize_t len;
 182
 183     for (;;) {
 184         len = qemu_recv(s->fd, buf, size, 0);
 185         if (len != -1) {
 186             break;
 187         }
 188         if (socket_error() == EAGAIN) {
 189             yield_until_fd_readable(s->fd);
 190         } else if (socket_error() != EINTR) {
 191             break;
 192         }
 193     }
 194
 195     if (len == -1) {
 196         len = -socket_error();
 197     }
 198     return len;
 199 }
 200
 201 static int socket_close(void *opaque)
 202 {
 203     QEMUFileSocket *s = opaque;
 204     closesocket(s->fd);
 205     g_free(s);
 206     return 0;
 207 }
 208
 209 static int stdio_get_fd(void *opaque)
 210 {
 211     QEMUFileStdio *s = opaque;
 212
 213     return fileno(s->stdio_file);
 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     for (;;) {
 229         clearerr(fp);
 230         bytes = fread(buf, 1, size, fp);
 231         if (bytes != 0 || !ferror(fp)) {
 232             break;
 233         }
 234         if (errno == EAGAIN) {
 235             yield_until_fd_readable(fileno(fp));
 236         } else if (errno != EINTR) {
 237             break;
 238         }
 239     }
 240     return bytes;
 241 }
 242
 243 static int stdio_pclose(void *opaque)
 244 {
 245     QEMUFileStdio *s = opaque;
 246     int ret;
 247     ret = pclose(s->stdio_file);
 248     if (ret == -1) {
 249         ret = -errno;
 250     }
 251     g_free(s);
 252     return ret;
 253 }
 254
 255 static int stdio_fclose(void *opaque)
 256 {
 257     QEMUFileStdio *s = opaque;
 258     int ret = 0;
 259     if (fclose(s->stdio_file) == EOF) {
 260         ret = -errno;
 261     }
 262     g_free(s);
 263     return ret;
 264 }
 265
 266 static const QEMUFileOps stdio_pipe_read_ops = {
 267     .get_fd =     stdio_get_fd,
 268     .get_buffer = stdio_get_buffer,
 269     .close =      stdio_pclose
 270 };
 271
 272 static const QEMUFileOps stdio_pipe_write_ops = {
 273     .get_fd =     stdio_get_fd,
 274     .put_buffer = stdio_put_buffer,
 275     .close =      stdio_pclose
 276 };
 277
 278 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 279 {
 280     QEMUFileStdio *s;
 281
 282     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 283         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 284         return NULL;
 285     }
 286
 287     s = g_malloc0(sizeof(QEMUFileStdio));
 288
 289     s->stdio_file = stdio_file;
 290
 291     if(mode[0] == 'r') {
 292         s->file = qemu_fopen_ops(s, &stdio_pipe_read_ops);
 293     } else {
 294         s->file = qemu_fopen_ops(s, &stdio_pipe_write_ops);
 295     }
 296     return s->file;
 297 }
 298
 299 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 300 {
 301     FILE *popen_file;
 302
 303     popen_file = popen(command, mode);
 304     if(popen_file == NULL) {
 305         return NULL;
 306     }
 307
 308     return qemu_popen(popen_file, mode);
 309 }
 310
 311 static const QEMUFileOps stdio_file_read_ops = {
 312     .get_fd =     stdio_get_fd,
 313     .get_buffer = stdio_get_buffer,
 314     .close =      stdio_fclose
 315 };
 316
 317 static const QEMUFileOps stdio_file_write_ops = {
 318     .get_fd =     stdio_get_fd,
 319     .put_buffer = stdio_put_buffer,
 320     .close =      stdio_fclose
 321 };
 322
 323 QEMUFile *qemu_fdopen(int fd, const char *mode)
 324 {
 325     QEMUFileStdio *s;
 326
 327     if (mode == NULL ||
 328         (mode[0] != 'r' && mode[0] != 'w') ||
 329         mode[1] != 'b' || mode[2] != 0) {
 330         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 331         return NULL;
 332     }
 333
 334     s = g_malloc0(sizeof(QEMUFileStdio));
 335     s->stdio_file = fdopen(fd, mode);
 336     if (!s->stdio_file)
 337         goto fail;
 338
 339     if(mode[0] == 'r') {
 340         s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
 341     } else {
 342         s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
 343     }
 344     return s->file;
 345
 346 fail:
 347     g_free(s);
 348     return NULL;
 349 }
 350
 351 static const QEMUFileOps socket_read_ops = {
 352     .get_fd =     socket_get_fd,
 353     .get_buffer = socket_get_buffer,
 354     .close =      socket_close
 355 };
 356
 357 QEMUFile *qemu_fopen_socket(int fd)
 358 {
 359     QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
 360
 361     s->fd = fd;
 362     s->file = qemu_fopen_ops(s, &socket_read_ops);
 363     return s->file;
 364 }
 365
 366 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 367 {
 368     QEMUFileStdio *s;
 369
 370     if (mode == NULL ||
 371         (mode[0] != 'r' && mode[0] != 'w') ||
 372         mode[1] != 'b' || mode[2] != 0) {
 373         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
 374         return NULL;
 375     }
 376
 377     s = g_malloc0(sizeof(QEMUFileStdio));
 378
 379     s->stdio_file = fopen(filename, mode);
 380     if (!s->stdio_file)
 381         goto fail;
 382
 383     if(mode[0] == 'w') {
 384         s->file = qemu_fopen_ops(s, &stdio_file_write_ops);
 385     } else {
 386         s->file = qemu_fopen_ops(s, &stdio_file_read_ops);
 387     }
 388     return s->file;
 389 fail:
 390     g_free(s);
 391     return NULL;
 392 }
 393
 394 static int block_put_buffer(void *opaque, const uint8_t *buf,
 395                            int64_t pos, int size)
 396 {
 397     bdrv_save_vmstate(opaque, buf, pos, size);
 398     return size;
 399 }
 400
 401 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 402 {
 403     return bdrv_load_vmstate(opaque, buf, pos, size);
 404 }
 405
 406 static int bdrv_fclose(void *opaque)
 407 {
 408     return bdrv_flush(opaque);
 409 }
 410
 411 static const QEMUFileOps bdrv_read_ops = {
 412     .get_buffer = block_get_buffer,
 413     .close =      bdrv_fclose
 414 };
 415
 416 static const QEMUFileOps bdrv_write_ops = {
 417     .put_buffer = block_put_buffer,
 418     .close =      bdrv_fclose
 419 };
 420
 421 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 422 {
 423     if (is_writable)
 424         return qemu_fopen_ops(bs, &bdrv_write_ops);
 425     return qemu_fopen_ops(bs, &bdrv_read_ops);
 426 }
 427
 428 QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
 429 {
 430     QEMUFile *f;
 431
 432     f = g_malloc0(sizeof(QEMUFile));
 433
 434     f->opaque = opaque;
 435     f->ops = ops;
 436     f->is_write = 0;
 437
 438     return f;
 439 }
 440
 441 int qemu_file_get_error(QEMUFile *f)
 442 {
 443     return f->last_error;
 444 }
 445
 446 static void qemu_file_set_error(QEMUFile *f, int ret)
 447 {
 448     if (f->last_error == 0) {
 449         f->last_error = ret;
 450     }
 451 }
 452
 453 /** Flushes QEMUFile buffer
 454  *
 455  */
 456 static int qemu_fflush(QEMUFile *f)
 457 {
 458     int ret = 0;
 459
 460     if (!f->ops->put_buffer)
 461         return 0;
 462
 463     if (f->is_write && f->buf_index > 0) {
 464         ret = f->ops->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 465         if (ret >= 0) {
 466             f->buf_offset += f->buf_index;
 467         }
 468         f->buf_index = 0;
 469     }
 470     return ret;
 471 }
 472
 473 static void qemu_fill_buffer(QEMUFile *f)
 474 {
 475     int len;
 476     int pending;
 477
 478     if (!f->ops->get_buffer)
 479         return;
 480
 481     if (f->is_write)
 482         abort();
 483
 484     pending = f->buf_size - f->buf_index;
 485     if (pending > 0) {
 486         memmove(f->buf, f->buf + f->buf_index, pending);
 487     }
 488     f->buf_index = 0;
 489     f->buf_size = pending;
 490
 491     len = f->ops->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
 492                         IO_BUF_SIZE - pending);
 493     if (len > 0) {
 494         f->buf_size += len;
 495         f->buf_offset += len;
 496     } else if (len == 0) {
 497         qemu_file_set_error(f, -EIO);
 498     } else if (len != -EAGAIN)
 499         qemu_file_set_error(f, len);
 500 }
 501
 502 int qemu_get_fd(QEMUFile *f)
 503 {
 504     if (f->ops->get_fd) {
 505         return f->ops->get_fd(f->opaque);
 506     }
 507     return -1;
 508 }
 509
 510 /** Closes the file
 511  *
 512  * Returns negative error value if any error happened on previous operations or
 513  * while closing the file. Returns 0 or positive number on success.
 514  *
 515  * The meaning of return value on success depends on the specific backend
 516  * being used.
 517  */
 518 int qemu_fclose(QEMUFile *f)
 519 {
 520     int ret;
 521     ret = qemu_fflush(f);
 522
 523     if (f->ops->close) {
 524         int ret2 = f->ops->close(f->opaque);
 525         if (ret >= 0) {
 526             ret = ret2;
 527         }
 528     }
 529     /* If any error was spotted before closing, we should report it
 530      * instead of the close() return value.
 531      */
 532     if (f->last_error) {
 533         ret = f->last_error;
 534     }
 535     g_free(f);
 536     return ret;
 537 }
 538
 539 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 540 {
 541     int l;
 542
 543     if (f->last_error) {
 544         return;
 545     }
 546
 547     if (f->is_write == 0 && f->buf_index > 0) {
 548         fprintf(stderr,
 549                 "Attempted to write to buffer while read buffer is not empty\n");
 550         abort();
 551     }
 552
 553     while (size > 0) {
 554         l = IO_BUF_SIZE - f->buf_index;
 555         if (l > size)
 556             l = size;
 557         memcpy(f->buf + f->buf_index, buf, l);
 558         f->is_write = 1;
 559         f->buf_index += l;
 560         buf += l;
 561         size -= l;
 562         if (f->buf_index >= IO_BUF_SIZE) {
 563             int ret = qemu_fflush(f);
 564             if (ret < 0) {
 565                 qemu_file_set_error(f, ret);
 566                 break;
 567             }
 568         }
 569     }
 570 }
 571
 572 void qemu_put_byte(QEMUFile *f, int v)
 573 {
 574     if (f->last_error) {
 575         return;
 576     }
 577
 578     if (f->is_write == 0 && f->buf_index > 0) {
 579         fprintf(stderr,
 580                 "Attempted to write to buffer while read buffer is not empty\n");
 581         abort();
 582     }
 583
 584     f->buf[f->buf_index++] = v;
 585     f->is_write = 1;
 586     if (f->buf_index >= IO_BUF_SIZE) {
 587         int ret = qemu_fflush(f);
 588         if (ret < 0) {
 589             qemu_file_set_error(f, ret);
 590         }
 591     }
 592 }
 593
 594 static void qemu_file_skip(QEMUFile *f, int size)
 595 {
 596     if (f->buf_index + size <= f->buf_size) {
 597         f->buf_index += size;
 598     }
 599 }
 600
 601 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
 602 {
 603     int pending;
 604     int index;
 605
 606     if (f->is_write) {
 607         abort();
 608     }
 609
 610     index = f->buf_index + offset;
 611     pending = f->buf_size - index;
 612     if (pending < size) {
 613         qemu_fill_buffer(f);
 614         index = f->buf_index + offset;
 615         pending = f->buf_size - index;
 616     }
 617
 618     if (pending <= 0) {
 619         return 0;
 620     }
 621     if (size > pending) {
 622         size = pending;
 623     }
 624
 625     memcpy(buf, f->buf + index, size);
 626     return size;
 627 }
 628
 629 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
 630 {
 631     int pending = size;
 632     int done = 0;
 633
 634     while (pending > 0) {
 635         int res;
 636
 637         res = qemu_peek_buffer(f, buf, pending, 0);
 638         if (res == 0) {
 639             return done;
 640         }
 641         qemu_file_skip(f, res);
 642         buf += res;
 643         pending -= res;
 644         done += res;
 645     }
 646     return done;
 647 }
 648
 649 static int qemu_peek_byte(QEMUFile *f, int offset)
 650 {
 651     int index = f->buf_index + offset;
 652
 653     if (f->is_write) {
 654         abort();
 655     }
 656
 657     if (index >= f->buf_size) {
 658         qemu_fill_buffer(f);
 659         index = f->buf_index + offset;
 660         if (index >= f->buf_size) {
 661             return 0;
 662         }
 663     }
 664     return f->buf[index];
 665 }
 666
 667 int qemu_get_byte(QEMUFile *f)
 668 {
 669     int result;
 670
 671     result = qemu_peek_byte(f, 0);
 672     qemu_file_skip(f, 1);
 673     return result;
 674 }
 675
 676 int64_t qemu_ftell(QEMUFile *f)
 677 {
 678     /* buf_offset excludes buffer for writing but includes it for reading */
 679     if (f->is_write) {
 680         return f->buf_offset + f->buf_index;
 681     } else {
 682         return f->buf_offset - f->buf_size + f->buf_index;
 683     }
 684 }
 685
 686 int qemu_file_rate_limit(QEMUFile *f)
 687 {
 688     if (f->ops->rate_limit)
 689         return f->ops->rate_limit(f->opaque);
 690
 691     return 0;
 692 }
 693
 694 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 695 {
 696     if (f->ops->get_rate_limit)
 697         return f->ops->get_rate_limit(f->opaque);
 698
 699     return 0;
 700 }
 701
 702 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
 703 {
 704     /* any failed or completed migration keeps its state to allow probing of
 705      * migration data, but has no associated file anymore */
 706     if (f && f->ops->set_rate_limit)
 707         return f->ops->set_rate_limit(f->opaque, new_rate);
 708
 709     return 0;
 710 }
 711
 712 void qemu_put_be16(QEMUFile *f, unsigned int v)
 713 {
 714     qemu_put_byte(f, v >> 8);
 715     qemu_put_byte(f, v);
 716 }
 717
 718 void qemu_put_be32(QEMUFile *f, unsigned int v)
 719 {
 720     qemu_put_byte(f, v >> 24);
 721     qemu_put_byte(f, v >> 16);
 722     qemu_put_byte(f, v >> 8);
 723     qemu_put_byte(f, v);
 724 }
 725
 726 void qemu_put_be64(QEMUFile *f, uint64_t v)
 727 {
 728     qemu_put_be32(f, v >> 32);
 729     qemu_put_be32(f, v);
 730 }
 731
 732 unsigned int qemu_get_be16(QEMUFile *f)
 733 {
 734     unsigned int v;
 735     v = qemu_get_byte(f) << 8;
 736     v |= qemu_get_byte(f);
 737     return v;
 738 }
 739
 740 unsigned int qemu_get_be32(QEMUFile *f)
 741 {
 742     unsigned int v;
 743     v = qemu_get_byte(f) << 24;
 744     v |= qemu_get_byte(f) << 16;
 745     v |= qemu_get_byte(f) << 8;
 746     v |= qemu_get_byte(f);
 747     return v;
 748 }
 749
 750 uint64_t qemu_get_be64(QEMUFile *f)
 751 {
 752     uint64_t v;
 753     v = (uint64_t)qemu_get_be32(f) << 32;
 754     v |= qemu_get_be32(f);
 755     return v;
 756 }
 757
 758
 759 /* timer */
 760
 761 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
 762 {
 763     uint64_t expire_time;
 764
 765     expire_time = qemu_timer_expire_time_ns(ts);
 766     qemu_put_be64(f, expire_time);
 767 }
 768
 769 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
 770 {
 771     uint64_t expire_time;
 772
 773     expire_time = qemu_get_be64(f);
 774     if (expire_time != -1) {
 775         qemu_mod_timer_ns(ts, expire_time);
 776     } else {
 777         qemu_del_timer(ts);
 778     }
 779 }
 780
 781
 782 /* bool */
 783
 784 static int get_bool(QEMUFile *f, void *pv, size_t size)
 785 {
 786     bool *v = pv;
 787     *v = qemu_get_byte(f);
 788     return 0;
 789 }
 790
 791 static void put_bool(QEMUFile *f, void *pv, size_t size)
 792 {
 793     bool *v = pv;
 794     qemu_put_byte(f, *v);
 795 }
 796
 797 const VMStateInfo vmstate_info_bool = {
 798     .name = "bool",
 799     .get  = get_bool,
 800     .put  = put_bool,
 801 };
 802
 803 /* 8 bit int */
 804
 805 static int get_int8(QEMUFile *f, void *pv, size_t size)
 806 {
 807     int8_t *v = pv;
 808     qemu_get_s8s(f, v);
 809     return 0;
 810 }
 811
 812 static void put_int8(QEMUFile *f, void *pv, size_t size)
 813 {
 814     int8_t *v = pv;
 815     qemu_put_s8s(f, v);
 816 }
 817
 818 const VMStateInfo vmstate_info_int8 = {
 819     .name = "int8",
 820     .get  = get_int8,
 821     .put  = put_int8,
 822 };
 823
 824 /* 16 bit int */
 825
 826 static int get_int16(QEMUFile *f, void *pv, size_t size)
 827 {
 828     int16_t *v = pv;
 829     qemu_get_sbe16s(f, v);
 830     return 0;
 831 }
 832
 833 static void put_int16(QEMUFile *f, void *pv, size_t size)
 834 {
 835     int16_t *v = pv;
 836     qemu_put_sbe16s(f, v);
 837 }
 838
 839 const VMStateInfo vmstate_info_int16 = {
 840     .name = "int16",
 841     .get  = get_int16,
 842     .put  = put_int16,
 843 };
 844
 845 /* 32 bit int */
 846
 847 static int get_int32(QEMUFile *f, void *pv, size_t size)
 848 {
 849     int32_t *v = pv;
 850     qemu_get_sbe32s(f, v);
 851     return 0;
 852 }
 853
 854 static void put_int32(QEMUFile *f, void *pv, size_t size)
 855 {
 856     int32_t *v = pv;
 857     qemu_put_sbe32s(f, v);
 858 }
 859
 860 const VMStateInfo vmstate_info_int32 = {
 861     .name = "int32",
 862     .get  = get_int32,
 863     .put  = put_int32,
 864 };
 865
 866 /* 32 bit int. See that the received value is the same than the one
 867    in the field */
 868
 869 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 870 {
 871     int32_t *v = pv;
 872     int32_t v2;
 873     qemu_get_sbe32s(f, &v2);
 874
 875     if (*v == v2)
 876         return 0;
 877     return -EINVAL;
 878 }
 879
 880 const VMStateInfo vmstate_info_int32_equal = {
 881     .name = "int32 equal",
 882     .get  = get_int32_equal,
 883     .put  = put_int32,
 884 };
 885
 886 /* 32 bit int. See that the received value is the less or the same
 887    than the one in the field */
 888
 889 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 890 {
 891     int32_t *old = pv;
 892     int32_t new;
 893     qemu_get_sbe32s(f, &new);
 894
 895     if (*old <= new)
 896         return 0;
 897     return -EINVAL;
 898 }
 899
 900 const VMStateInfo vmstate_info_int32_le = {
 901     .name = "int32 equal",
 902     .get  = get_int32_le,
 903     .put  = put_int32,
 904 };
 905
 906 /* 64 bit int */
 907
 908 static int get_int64(QEMUFile *f, void *pv, size_t size)
 909 {
 910     int64_t *v = pv;
 911     qemu_get_sbe64s(f, v);
 912     return 0;
 913 }
 914
 915 static void put_int64(QEMUFile *f, void *pv, size_t size)
 916 {
 917     int64_t *v = pv;
 918     qemu_put_sbe64s(f, v);
 919 }
 920
 921 const VMStateInfo vmstate_info_int64 = {
 922     .name = "int64",
 923     .get  = get_int64,
 924     .put  = put_int64,
 925 };
 926
 927 /* 8 bit unsigned int */
 928
 929 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 930 {
 931     uint8_t *v = pv;
 932     qemu_get_8s(f, v);
 933     return 0;
 934 }
 935
 936 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 937 {
 938     uint8_t *v = pv;
 939     qemu_put_8s(f, v);
 940 }
 941
 942 const VMStateInfo vmstate_info_uint8 = {
 943     .name = "uint8",
 944     .get  = get_uint8,
 945     .put  = put_uint8,
 946 };
 947
 948 /* 16 bit unsigned int */
 949
 950 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 951 {
 952     uint16_t *v = pv;
 953     qemu_get_be16s(f, v);
 954     return 0;
 955 }
 956
 957 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 958 {
 959     uint16_t *v = pv;
 960     qemu_put_be16s(f, v);
 961 }
 962
 963 const VMStateInfo vmstate_info_uint16 = {
 964     .name = "uint16",
 965     .get  = get_uint16,
 966     .put  = put_uint16,
 967 };
 968
 969 /* 32 bit unsigned int */
 970
 971 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 972 {
 973     uint32_t *v = pv;
 974     qemu_get_be32s(f, v);
 975     return 0;
 976 }
 977
 978 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 979 {
 980     uint32_t *v = pv;
 981     qemu_put_be32s(f, v);
 982 }
 983
 984 const VMStateInfo vmstate_info_uint32 = {
 985     .name = "uint32",
 986     .get  = get_uint32,
 987     .put  = put_uint32,
 988 };
 989
 990 /* 32 bit uint. See that the received value is the same than the one
 991    in the field */
 992
 993 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
 994 {
 995     uint32_t *v = pv;
 996     uint32_t v2;
 997     qemu_get_be32s(f, &v2);
 998
 999     if (*v == v2) {
1000         return 0;
1001     }
1002     return -EINVAL;
1003 }
1004
1005 const VMStateInfo vmstate_info_uint32_equal = {
1006     .name = "uint32 equal",
1007     .get  = get_uint32_equal,
1008     .put  = put_uint32,
1009 };
1010
1011 /* 64 bit unsigned int */
1012
1013 static int get_uint64(QEMUFile *f, void *pv, size_t size)
1014 {
1015     uint64_t *v = pv;
1016     qemu_get_be64s(f, v);
1017     return 0;
1018 }
1019
1020 static void put_uint64(QEMUFile *f, void *pv, size_t size)
1021 {
1022     uint64_t *v = pv;
1023     qemu_put_be64s(f, v);
1024 }
1025
1026 const VMStateInfo vmstate_info_uint64 = {
1027     .name = "uint64",
1028     .get  = get_uint64,
1029     .put  = put_uint64,
1030 };
1031
1032 /* 8 bit int. See that the received value is the same than the one
1033    in the field */
1034
1035 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1036 {
1037     uint8_t *v = pv;
1038     uint8_t v2;
1039     qemu_get_8s(f, &v2);
1040
1041     if (*v == v2)
1042         return 0;
1043     return -EINVAL;
1044 }
1045
1046 const VMStateInfo vmstate_info_uint8_equal = {
1047     .name = "uint8 equal",
1048     .get  = get_uint8_equal,
1049     .put  = put_uint8,
1050 };
1051
1052 /* 16 bit unsigned int int. See that the received value is the same than the one
1053    in the field */
1054
1055 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1056 {
1057     uint16_t *v = pv;
1058     uint16_t v2;
1059     qemu_get_be16s(f, &v2);
1060
1061     if (*v == v2)
1062         return 0;
1063     return -EINVAL;
1064 }
1065
1066 const VMStateInfo vmstate_info_uint16_equal = {
1067     .name = "uint16 equal",
1068     .get  = get_uint16_equal,
1069     .put  = put_uint16,
1070 };
1071
1072 /* timers  */
1073
1074 static int get_timer(QEMUFile *f, void *pv, size_t size)
1075 {
1076     QEMUTimer *v = pv;
1077     qemu_get_timer(f, v);
1078     return 0;
1079 }
1080
1081 static void put_timer(QEMUFile *f, void *pv, size_t size)
1082 {
1083     QEMUTimer *v = pv;
1084     qemu_put_timer(f, v);
1085 }
1086
1087 const VMStateInfo vmstate_info_timer = {
1088     .name = "timer",
1089     .get  = get_timer,
1090     .put  = put_timer,
1091 };
1092
1093 /* uint8_t buffers */
1094
1095 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1096 {
1097     uint8_t *v = pv;
1098     qemu_get_buffer(f, v, size);
1099     return 0;
1100 }
1101
1102 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1103 {
1104     uint8_t *v = pv;
1105     qemu_put_buffer(f, v, size);
1106 }
1107
1108 const VMStateInfo vmstate_info_buffer = {
1109     .name = "buffer",
1110     .get  = get_buffer,
1111     .put  = put_buffer,
1112 };
1113
1114 /* unused buffers: space that was used for some fields that are
1115    not useful anymore */
1116
1117 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1118 {
1119     uint8_t buf[1024];
1120     int block_len;
1121
1122     while (size > 0) {
1123         block_len = MIN(sizeof(buf), size);
1124         size -= block_len;
1125         qemu_get_buffer(f, buf, block_len);
1126     }
1127    return 0;
1128 }
1129
1130 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1131 {
1132     static const uint8_t buf[1024];
1133     int block_len;
1134
1135     while (size > 0) {
1136         block_len = MIN(sizeof(buf), size);
1137         size -= block_len;
1138         qemu_put_buffer(f, buf, block_len);
1139     }
1140 }
1141
1142 const VMStateInfo vmstate_info_unused_buffer = {
1143     .name = "unused_buffer",
1144     .get  = get_unused_buffer,
1145     .put  = put_unused_buffer,
1146 };
1147
1148 /* bitmaps (as defined by bitmap.h). Note that size here is the size
1149  * of the bitmap in bits. The on-the-wire format of a bitmap is 64
1150  * bit words with the bits in big endian order. The in-memory format
1151  * is an array of 'unsigned long', which may be either 32 or 64 bits.
1152  */
1153 /* This is the number of 64 bit words sent over the wire */
1154 #define BITS_TO_U64S(nr) DIV_ROUND_UP(nr, 64)
1155 static int get_bitmap(QEMUFile *f, void *pv, size_t size)
1156 {
1157     unsigned long *bmp = pv;
1158     int i, idx = 0;
1159     for (i = 0; i < BITS_TO_U64S(size); i++) {
1160         uint64_t w = qemu_get_be64(f);
1161         bmp[idx++] = w;
1162         if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1163             bmp[idx++] = w >> 32;
1164         }
1165     }
1166     return 0;
1167 }
1168
1169 static void put_bitmap(QEMUFile *f, void *pv, size_t size)
1170 {
1171     unsigned long *bmp = pv;
1172     int i, idx = 0;
1173     for (i = 0; i < BITS_TO_U64S(size); i++) {
1174         uint64_t w = bmp[idx++];
1175         if (sizeof(unsigned long) == 4 && idx < BITS_TO_LONGS(size)) {
1176             w |= ((uint64_t)bmp[idx++]) << 32;
1177         }
1178         qemu_put_be64(f, w);
1179     }
1180 }
1181
1182 const VMStateInfo vmstate_info_bitmap = {
1183     .name = "bitmap",
1184     .get = get_bitmap,
1185     .put = put_bitmap,
1186 };
1187
1188 typedef struct CompatEntry {
1189     char idstr[256];
1190     int instance_id;
1191 } CompatEntry;
1192
1193 typedef struct SaveStateEntry {
1194     QTAILQ_ENTRY(SaveStateEntry) entry;
1195     char idstr[256];
1196     int instance_id;
1197     int alias_id;
1198     int version_id;
1199     int section_id;
1200     SaveVMHandlers *ops;
1201     const VMStateDescription *vmsd;
1202     void *opaque;
1203     CompatEntry *compat;
1204     int no_migrate;
1205     int is_ram;
1206 } SaveStateEntry;
1207
1208
1209 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1210     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1211 static int global_section_id;
1212
1213 static int calculate_new_instance_id(const char *idstr)
1214 {
1215     SaveStateEntry *se;
1216     int instance_id = 0;
1217
1218     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1219         if (strcmp(idstr, se->idstr) == 0
1220             && instance_id <= se->instance_id) {
1221             instance_id = se->instance_id + 1;
1222         }
1223     }
1224     return instance_id;
1225 }
1226
1227 static int calculate_compat_instance_id(const char *idstr)
1228 {
1229     SaveStateEntry *se;
1230     int instance_id = 0;
1231
1232     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1233         if (!se->compat)
1234             continue;
1235
1236         if (strcmp(idstr, se->compat->idstr) == 0
1237             && instance_id <= se->compat->instance_id) {
1238             instance_id = se->compat->instance_id + 1;
1239         }
1240     }
1241     return instance_id;
1242 }
1243
1244 /* TODO: Individual devices generally have very little idea about the rest
1245    of the system, so instance_id should be removed/replaced.
1246    Meanwhile pass -1 as instance_id if you do not already have a clearly
1247    distinguishing id for all instances of your device class. */
1248 int register_savevm_live(DeviceState *dev,
1249                          const char *idstr,
1250                          int instance_id,
1251                          int version_id,
1252                          SaveVMHandlers *ops,
1253                          void *opaque)
1254 {
1255     SaveStateEntry *se;
1256
1257     se = g_malloc0(sizeof(SaveStateEntry));
1258     se->version_id = version_id;
1259     se->section_id = global_section_id++;
1260     se->ops = ops;
1261     se->opaque = opaque;
1262     se->vmsd = NULL;
1263     se->no_migrate = 0;
1264     /* if this is a live_savem then set is_ram */
1265     if (ops->save_live_setup != NULL) {
1266         se->is_ram = 1;
1267     }
1268
1269     if (dev) {
1270         char *id = qdev_get_dev_path(dev);
1271         if (id) {
1272             pstrcpy(se->idstr, sizeof(se->idstr), id);
1273             pstrcat(se->idstr, sizeof(se->idstr), "/");
1274             g_free(id);
1275
1276             se->compat = g_malloc0(sizeof(CompatEntry));
1277             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1278             se->compat->instance_id = instance_id == -1 ?
1279                          calculate_compat_instance_id(idstr) : instance_id;
1280             instance_id = -1;
1281         }
1282     }
1283     pstrcat(se->idstr, sizeof(se->idstr), idstr);
1284
1285     if (instance_id == -1) {
1286         se->instance_id = calculate_new_instance_id(se->idstr);
1287     } else {
1288         se->instance_id = instance_id;
1289     }
1290     assert(!se->compat || se->instance_id == 0);
1291     /* add at the end of list */
1292     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1293     return 0;
1294 }
1295
1296 int register_savevm(DeviceState *dev,
1297                     const char *idstr,
1298                     int instance_id,
1299                     int version_id,
1300                     SaveStateHandler *save_state,
1301                     LoadStateHandler *load_state,
1302                     void *opaque)
1303 {
1304     SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
1305     ops->save_state = save_state;
1306     ops->load_state = load_state;
1307     return register_savevm_live(dev, idstr, instance_id, version_id,
1308                                 ops, opaque);
1309 }
1310
1311 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1312 {
1313     SaveStateEntry *se, *new_se;
1314     char id[256] = "";
1315
1316     if (dev) {
1317         char *path = qdev_get_dev_path(dev);
1318         if (path) {
1319             pstrcpy(id, sizeof(id), path);
1320             pstrcat(id, sizeof(id), "/");
1321             g_free(path);
1322         }
1323     }
1324     pstrcat(id, sizeof(id), idstr);
1325
1326     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1327         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1328             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1329             if (se->compat) {
1330                 g_free(se->compat);
1331             }
1332             g_free(se->ops);
1333             g_free(se);
1334         }
1335     }
1336 }
1337
1338 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1339                                    const VMStateDescription *vmsd,
1340                                    void *opaque, int alias_id,
1341                                    int required_for_version)
1342 {
1343     SaveStateEntry *se;
1344
1345     /* If this triggers, alias support can be dropped for the vmsd. */
1346     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1347
1348     se = g_malloc0(sizeof(SaveStateEntry));
1349     se->version_id = vmsd->version_id;
1350     se->section_id = global_section_id++;
1351     se->opaque = opaque;
1352     se->vmsd = vmsd;
1353     se->alias_id = alias_id;
1354     se->no_migrate = vmsd->unmigratable;
1355
1356     if (dev) {
1357         char *id = qdev_get_dev_path(dev);
1358         if (id) {
1359             pstrcpy(se->idstr, sizeof(se->idstr), id);
1360             pstrcat(se->idstr, sizeof(se->idstr), "/");
1361             g_free(id);
1362
1363             se->compat = g_malloc0(sizeof(CompatEntry));
1364             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1365             se->compat->instance_id = instance_id == -1 ?
1366                          calculate_compat_instance_id(vmsd->name) : instance_id;
1367             instance_id = -1;
1368         }
1369     }
1370     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1371
1372     if (instance_id == -1) {
1373         se->instance_id = calculate_new_instance_id(se->idstr);
1374     } else {
1375         se->instance_id = instance_id;
1376     }
1377     assert(!se->compat || se->instance_id == 0);
1378     /* add at the end of list */
1379     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1380     return 0;
1381 }
1382
1383 int vmstate_register(DeviceState *dev, int instance_id,
1384                      const VMStateDescription *vmsd, void *opaque)
1385 {
1386     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1387                                           opaque, -1, 0);
1388 }
1389
1390 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1391                         void *opaque)
1392 {
1393     SaveStateEntry *se, *new_se;
1394
1395     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1396         if (se->vmsd == vmsd && se->opaque == opaque) {
1397             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1398             if (se->compat) {
1399                 g_free(se->compat);
1400             }
1401             g_free(se);
1402         }
1403     }
1404 }
1405
1406 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1407                                     void *opaque);
1408 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1409                                    void *opaque);
1410
1411 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1412                        void *opaque, int version_id)
1413 {
1414     VMStateField *field = vmsd->fields;
1415     int ret;
1416
1417     if (version_id > vmsd->version_id) {
1418         return -EINVAL;
1419     }
1420     if (version_id < vmsd->minimum_version_id_old) {
1421         return -EINVAL;
1422     }
1423     if  (version_id < vmsd->minimum_version_id) {
1424         return vmsd->load_state_old(f, opaque, version_id);
1425     }
1426     if (vmsd->pre_load) {
1427         int ret = vmsd->pre_load(opaque);
1428         if (ret)
1429             return ret;
1430     }
1431     while(field->name) {
1432         if ((field->field_exists &&
1433              field->field_exists(opaque, version_id)) ||
1434             (!field->field_exists &&
1435              field->version_id <= version_id)) {
1436             void *base_addr = opaque + field->offset;
1437             int i, n_elems = 1;
1438             int size = field->size;
1439
1440             if (field->flags & VMS_VBUFFER) {
1441                 size = *(int32_t *)(opaque+field->size_offset);
1442                 if (field->flags & VMS_MULTIPLY) {
1443                     size *= field->size;
1444                 }
1445             }
1446             if (field->flags & VMS_ARRAY) {
1447                 n_elems = field->num;
1448             } else if (field->flags & VMS_VARRAY_INT32) {
1449                 n_elems = *(int32_t *)(opaque+field->num_offset);
1450             } else if (field->flags & VMS_VARRAY_UINT32) {
1451                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1452             } else if (field->flags & VMS_VARRAY_UINT16) {
1453                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1454             } else if (field->flags & VMS_VARRAY_UINT8) {
1455                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1456             }
1457             if (field->flags & VMS_POINTER) {
1458                 base_addr = *(void **)base_addr + field->start;
1459             }
1460             for (i = 0; i < n_elems; i++) {
1461                 void *addr = base_addr + size * i;
1462
1463                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1464                     addr = *(void **)addr;
1465                 }
1466                 if (field->flags & VMS_STRUCT) {
1467                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1468                 } else {
1469                     ret = field->info->get(f, addr, size);
1470
1471                 }
1472                 if (ret < 0) {
1473                     return ret;
1474                 }
1475             }
1476         }
1477         field++;
1478     }
1479     ret = vmstate_subsection_load(f, vmsd, opaque);
1480     if (ret != 0) {
1481         return ret;
1482     }
1483     if (vmsd->post_load) {
1484         return vmsd->post_load(opaque, version_id);
1485     }
1486     return 0;
1487 }
1488
1489 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1490                         void *opaque)
1491 {
1492     VMStateField *field = vmsd->fields;
1493
1494     if (vmsd->pre_save) {
1495         vmsd->pre_save(opaque);
1496     }
1497     while(field->name) {
1498         if (!field->field_exists ||
1499             field->field_exists(opaque, vmsd->version_id)) {
1500             void *base_addr = opaque + field->offset;
1501             int i, n_elems = 1;
1502             int size = field->size;
1503
1504             if (field->flags & VMS_VBUFFER) {
1505                 size = *(int32_t *)(opaque+field->size_offset);
1506                 if (field->flags & VMS_MULTIPLY) {
1507                     size *= field->size;
1508                 }
1509             }
1510             if (field->flags & VMS_ARRAY) {
1511                 n_elems = field->num;
1512             } else if (field->flags & VMS_VARRAY_INT32) {
1513                 n_elems = *(int32_t *)(opaque+field->num_offset);
1514             } else if (field->flags & VMS_VARRAY_UINT32) {
1515                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1516             } else if (field->flags & VMS_VARRAY_UINT16) {
1517                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1518             } else if (field->flags & VMS_VARRAY_UINT8) {
1519                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1520             }
1521             if (field->flags & VMS_POINTER) {
1522                 base_addr = *(void **)base_addr + field->start;
1523             }
1524             for (i = 0; i < n_elems; i++) {
1525                 void *addr = base_addr + size * i;
1526
1527                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1528                     addr = *(void **)addr;
1529                 }
1530                 if (field->flags & VMS_STRUCT) {
1531                     vmstate_save_state(f, field->vmsd, addr);
1532                 } else {
1533                     field->info->put(f, addr, size);
1534                 }
1535             }
1536         }
1537         field++;
1538     }
1539     vmstate_subsection_save(f, vmsd, opaque);
1540 }
1541
1542 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1543 {
1544     if (!se->vmsd) {         /* Old style */
1545         return se->ops->load_state(f, se->opaque, version_id);
1546     }
1547     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1548 }
1549
1550 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1551 {
1552     if (!se->vmsd) {         /* Old style */
1553         se->ops->save_state(f, se->opaque);
1554         return;
1555     }
1556     vmstate_save_state(f,se->vmsd, se->opaque);
1557 }
1558
1559 #define QEMU_VM_FILE_MAGIC           0x5145564d
1560 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1561 #define QEMU_VM_FILE_VERSION         0x00000003
1562
1563 #define QEMU_VM_EOF                  0x00
1564 #define QEMU_VM_SECTION_START        0x01
1565 #define QEMU_VM_SECTION_PART         0x02
1566 #define QEMU_VM_SECTION_END          0x03
1567 #define QEMU_VM_SECTION_FULL         0x04
1568 #define QEMU_VM_SUBSECTION           0x05
1569
1570 bool qemu_savevm_state_blocked(Error **errp)
1571 {
1572     SaveStateEntry *se;
1573
1574     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1575         if (se->no_migrate) {
1576             error_set(errp, QERR_MIGRATION_NOT_SUPPORTED, se->idstr);
1577             return true;
1578         }
1579     }
1580     return false;
1581 }
1582
1583 int qemu_savevm_state_begin(QEMUFile *f,
1584                             const MigrationParams *params)
1585 {
1586     SaveStateEntry *se;
1587     int ret;
1588
1589     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1590         if (!se->ops || !se->ops->set_params) {
1591             continue;
1592         }
1593         se->ops->set_params(params, se->opaque);
1594     }
1595
1596     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1597     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1598
1599     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1600         int len;
1601
1602         if (!se->ops || !se->ops->save_live_setup) {
1603             continue;
1604         }
1605         if (se->ops && se->ops->is_active) {
1606             if (!se->ops->is_active(se->opaque)) {
1607                 continue;
1608             }
1609         }
1610         /* Section type */
1611         qemu_put_byte(f, QEMU_VM_SECTION_START);
1612         qemu_put_be32(f, se->section_id);
1613
1614         /* ID string */
1615         len = strlen(se->idstr);
1616         qemu_put_byte(f, len);
1617         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1618
1619         qemu_put_be32(f, se->instance_id);
1620         qemu_put_be32(f, se->version_id);
1621
1622         ret = se->ops->save_live_setup(f, se->opaque);
1623         if (ret < 0) {
1624             qemu_savevm_state_cancel();
1625             return ret;
1626         }
1627     }
1628     ret = qemu_file_get_error(f);
1629     if (ret != 0) {
1630         qemu_savevm_state_cancel();
1631     }
1632
1633     return ret;
1634
1635 }
1636
1637 /*
1638  * this function has three return values:
1639  *   negative: there was one error, and we have -errno.
1640  *   0 : We haven't finished, caller have to go again
1641  *   1 : We have finished, we can go to complete phase
1642  */
1643 int qemu_savevm_state_iterate(QEMUFile *f)
1644 {
1645     SaveStateEntry *se;
1646     int ret = 1;
1647
1648     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1649         if (!se->ops || !se->ops->save_live_iterate) {
1650             continue;
1651         }
1652         if (se->ops && se->ops->is_active) {
1653             if (!se->ops->is_active(se->opaque)) {
1654                 continue;
1655             }
1656         }
1657         if (qemu_file_rate_limit(f)) {
1658             return 0;
1659         }
1660         trace_savevm_section_start();
1661         /* Section type */
1662         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1663         qemu_put_be32(f, se->section_id);
1664
1665         ret = se->ops->save_live_iterate(f, se->opaque);
1666         trace_savevm_section_end(se->section_id);
1667
1668         if (ret <= 0) {
1669             /* Do not proceed to the next vmstate before this one reported
1670                completion of the current stage. This serializes the migration
1671                and reduces the probability that a faster changing state is
1672                synchronized over and over again. */
1673             break;
1674         }
1675     }
1676     if (ret != 0) {
1677         return ret;
1678     }
1679     ret = qemu_file_get_error(f);
1680     if (ret != 0) {
1681         qemu_savevm_state_cancel();
1682     }
1683     return ret;
1684 }
1685
1686 int qemu_savevm_state_complete(QEMUFile *f)
1687 {
1688     SaveStateEntry *se;
1689     int ret;
1690
1691     cpu_synchronize_all_states();
1692
1693     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1694         if (!se->ops || !se->ops->save_live_complete) {
1695             continue;
1696         }
1697         if (se->ops && se->ops->is_active) {
1698             if (!se->ops->is_active(se->opaque)) {
1699                 continue;
1700             }
1701         }
1702         trace_savevm_section_start();
1703         /* Section type */
1704         qemu_put_byte(f, QEMU_VM_SECTION_END);
1705         qemu_put_be32(f, se->section_id);
1706
1707         ret = se->ops->save_live_complete(f, se->opaque);
1708         trace_savevm_section_end(se->section_id);
1709         if (ret < 0) {
1710             return ret;
1711         }
1712     }
1713
1714     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1715         int len;
1716
1717         if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1718             continue;
1719         }
1720         trace_savevm_section_start();
1721         /* Section type */
1722         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1723         qemu_put_be32(f, se->section_id);
1724
1725         /* ID string */
1726         len = strlen(se->idstr);
1727         qemu_put_byte(f, len);
1728         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1729
1730         qemu_put_be32(f, se->instance_id);
1731         qemu_put_be32(f, se->version_id);
1732
1733         vmstate_save(f, se);
1734         trace_savevm_section_end(se->section_id);
1735     }
1736
1737     qemu_put_byte(f, QEMU_VM_EOF);
1738
1739     return qemu_file_get_error(f);
1740 }
1741
1742 uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
1743 {
1744     SaveStateEntry *se;
1745     uint64_t ret = 0;
1746
1747     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1748         if (!se->ops || !se->ops->save_live_pending) {
1749             continue;
1750         }
1751         if (se->ops && se->ops->is_active) {
1752             if (!se->ops->is_active(se->opaque)) {
1753                 continue;
1754             }
1755         }
1756         ret += se->ops->save_live_pending(f, se->opaque, max_size);
1757     }
1758     return ret;
1759 }
1760
1761 void qemu_savevm_state_cancel(void)
1762 {
1763     SaveStateEntry *se;
1764
1765     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1766         if (se->ops && se->ops->cancel) {
1767             se->ops->cancel(se->opaque);
1768         }
1769     }
1770 }
1771
1772 static int qemu_savevm_state(QEMUFile *f)
1773 {
1774     int ret;
1775     MigrationParams params = {
1776         .blk = 0,
1777         .shared = 0
1778     };
1779
1780     if (qemu_savevm_state_blocked(NULL)) {
1781         ret = -EINVAL;
1782         goto out;
1783     }
1784
1785     ret = qemu_savevm_state_begin(f, &params);
1786     if (ret < 0)
1787         goto out;
1788
1789     do {
1790         ret = qemu_savevm_state_iterate(f);
1791         if (ret < 0)
1792             goto out;
1793     } while (ret == 0);
1794
1795     ret = qemu_savevm_state_complete(f);
1796
1797 out:
1798     if (ret == 0) {
1799         ret = qemu_file_get_error(f);
1800     }
1801
1802     return ret;
1803 }
1804
1805 static int qemu_save_device_state(QEMUFile *f)
1806 {
1807     SaveStateEntry *se;
1808
1809     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1810     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1811
1812     cpu_synchronize_all_states();
1813
1814     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1815         int len;
1816
1817         if (se->is_ram) {
1818             continue;
1819         }
1820         if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1821             continue;
1822         }
1823
1824         /* Section type */
1825         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1826         qemu_put_be32(f, se->section_id);
1827
1828         /* ID string */
1829         len = strlen(se->idstr);
1830         qemu_put_byte(f, len);
1831         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1832
1833         qemu_put_be32(f, se->instance_id);
1834         qemu_put_be32(f, se->version_id);
1835
1836         vmstate_save(f, se);
1837     }
1838
1839     qemu_put_byte(f, QEMU_VM_EOF);
1840
1841     return qemu_file_get_error(f);
1842 }
1843
1844 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1845 {
1846     SaveStateEntry *se;
1847
1848     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1849         if (!strcmp(se->idstr, idstr) &&
1850             (instance_id == se->instance_id ||
1851              instance_id == se->alias_id))
1852             return se;
1853         /* Migrating from an older version? */
1854         if (strstr(se->idstr, idstr) && se->compat) {
1855             if (!strcmp(se->compat->idstr, idstr) &&
1856                 (instance_id == se->compat->instance_id ||
1857                  instance_id == se->alias_id))
1858                 return se;
1859         }
1860     }
1861     return NULL;
1862 }
1863
1864 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1865 {
1866     while(sub && sub->needed) {
1867         if (strcmp(idstr, sub->vmsd->name) == 0) {
1868             return sub->vmsd;
1869         }
1870         sub++;
1871     }
1872     return NULL;
1873 }
1874
1875 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1876                                    void *opaque)
1877 {
1878     while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
1879         char idstr[256];
1880         int ret;
1881         uint8_t version_id, len, size;
1882         const VMStateDescription *sub_vmsd;
1883
1884         len = qemu_peek_byte(f, 1);
1885         if (len < strlen(vmsd->name) + 1) {
1886             /* subsection name has be be "section_name/a" */
1887             return 0;
1888         }
1889         size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
1890         if (size != len) {
1891             return 0;
1892         }
1893         idstr[size] = 0;
1894
1895         if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
1896             /* it don't have a valid subsection name */
1897             return 0;
1898         }
1899         sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1900         if (sub_vmsd == NULL) {
1901             return -ENOENT;
1902         }
1903         qemu_file_skip(f, 1); /* subsection */
1904         qemu_file_skip(f, 1); /* len */
1905         qemu_file_skip(f, len); /* idstr */
1906         version_id = qemu_get_be32(f);
1907
1908         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1909         if (ret) {
1910             return ret;
1911         }
1912     }
1913     return 0;
1914 }
1915
1916 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1917                                     void *opaque)
1918 {
1919     const VMStateSubsection *sub = vmsd->subsections;
1920
1921     while (sub && sub->needed) {
1922         if (sub->needed(opaque)) {
1923             const VMStateDescription *vmsd = sub->vmsd;
1924             uint8_t len;
1925
1926             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1927             len = strlen(vmsd->name);
1928             qemu_put_byte(f, len);
1929             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1930             qemu_put_be32(f, vmsd->version_id);
1931             vmstate_save_state(f, vmsd, opaque);
1932         }
1933         sub++;
1934     }
1935 }
1936
1937 typedef struct LoadStateEntry {
1938     QLIST_ENTRY(LoadStateEntry) entry;
1939     SaveStateEntry *se;
1940     int section_id;
1941     int version_id;
1942 } LoadStateEntry;
1943
1944 int qemu_loadvm_state(QEMUFile *f)
1945 {
1946     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1947         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1948     LoadStateEntry *le, *new_le;
1949     uint8_t section_type;
1950     unsigned int v;
1951     int ret;
1952
1953     if (qemu_savevm_state_blocked(NULL)) {
1954         return -EINVAL;
1955     }
1956
1957     v = qemu_get_be32(f);
1958     if (v != QEMU_VM_FILE_MAGIC)
1959         return -EINVAL;
1960
1961     v = qemu_get_be32(f);
1962     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1963         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1964         return -ENOTSUP;
1965     }
1966     if (v != QEMU_VM_FILE_VERSION)
1967         return -ENOTSUP;
1968
1969     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1970         uint32_t instance_id, version_id, section_id;
1971         SaveStateEntry *se;
1972         char idstr[257];
1973         int len;
1974
1975         switch (section_type) {
1976         case QEMU_VM_SECTION_START:
1977         case QEMU_VM_SECTION_FULL:
1978             /* Read section start */
1979             section_id = qemu_get_be32(f);
1980             len = qemu_get_byte(f);
1981             qemu_get_buffer(f, (uint8_t *)idstr, len);
1982             idstr[len] = 0;
1983             instance_id = qemu_get_be32(f);
1984             version_id = qemu_get_be32(f);
1985
1986             /* Find savevm section */
1987             se = find_se(idstr, instance_id);
1988             if (se == NULL) {
1989                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1990                 ret = -EINVAL;
1991                 goto out;
1992             }
1993
1994             /* Validate version */
1995             if (version_id > se->version_id) {
1996                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1997                         version_id, idstr, se->version_id);
1998                 ret = -EINVAL;
1999                 goto out;
2000             }
2001
2002             /* Add entry */
2003             le = g_malloc0(sizeof(*le));
2004
2005             le->se = se;
2006             le->section_id = section_id;
2007             le->version_id = version_id;
2008             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
2009
2010             ret = vmstate_load(f, le->se, le->version_id);
2011             if (ret < 0) {
2012                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
2013                         instance_id, idstr);
2014                 goto out;
2015             }
2016             break;
2017         case QEMU_VM_SECTION_PART:
2018         case QEMU_VM_SECTION_END:
2019             section_id = qemu_get_be32(f);
2020
2021             QLIST_FOREACH(le, &loadvm_handlers, entry) {
2022                 if (le->section_id == section_id) {
2023                     break;
2024                 }
2025             }
2026             if (le == NULL) {
2027                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
2028                 ret = -EINVAL;
2029                 goto out;
2030             }
2031
2032             ret = vmstate_load(f, le->se, le->version_id);
2033             if (ret < 0) {
2034                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
2035                         section_id);
2036                 goto out;
2037             }
2038             break;
2039         default:
2040             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
2041             ret = -EINVAL;
2042             goto out;
2043         }
2044     }
2045
2046     cpu_synchronize_all_post_init();
2047
2048     ret = 0;
2049
2050 out:
2051     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
2052         QLIST_REMOVE(le, entry);
2053         g_free(le);
2054     }
2055
2056     if (ret == 0) {
2057         ret = qemu_file_get_error(f);
2058     }
2059
2060     return ret;
2061 }
2062
2063 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
2064                               const char *name)
2065 {
2066     QEMUSnapshotInfo *sn_tab, *sn;
2067     int nb_sns, i, ret;
2068
2069     ret = -ENOENT;
2070     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2071     if (nb_sns < 0)
2072         return ret;
2073     for(i = 0; i < nb_sns; i++) {
2074         sn = &sn_tab[i];
2075         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
2076             *sn_info = *sn;
2077             ret = 0;
2078             break;
2079         }
2080     }
2081     g_free(sn_tab);
2082     return ret;
2083 }
2084
2085 /*
2086  * Deletes snapshots of a given name in all opened images.
2087  */
2088 static int del_existing_snapshots(Monitor *mon, const char *name)
2089 {
2090     BlockDriverState *bs;
2091     QEMUSnapshotInfo sn1, *snapshot = &sn1;
2092     int ret;
2093
2094     bs = NULL;
2095     while ((bs = bdrv_next(bs))) {
2096         if (bdrv_can_snapshot(bs) &&
2097             bdrv_snapshot_find(bs, snapshot, name) >= 0)
2098         {
2099             ret = bdrv_snapshot_delete(bs, name);
2100             if (ret < 0) {
2101                 monitor_printf(mon,
2102                                "Error while deleting snapshot on '%s'\n",
2103                                bdrv_get_device_name(bs));
2104                 return -1;
2105             }
2106         }
2107     }
2108
2109     return 0;
2110 }
2111
2112 void do_savevm(Monitor *mon, const QDict *qdict)
2113 {
2114     BlockDriverState *bs, *bs1;
2115     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2116     int ret;
2117     QEMUFile *f;
2118     int saved_vm_running;
2119     uint64_t vm_state_size;
2120     qemu_timeval tv;
2121     struct tm tm;
2122     const char *name = qdict_get_try_str(qdict, "name");
2123
2124     /* Verify if there is a device that doesn't support snapshots and is writable */
2125     bs = NULL;
2126     while ((bs = bdrv_next(bs))) {
2127
2128         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2129             continue;
2130         }
2131
2132         if (!bdrv_can_snapshot(bs)) {
2133             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2134                                bdrv_get_device_name(bs));
2135             return;
2136         }
2137     }
2138
2139     bs = bdrv_snapshots();
2140     if (!bs) {
2141         monitor_printf(mon, "No block device can accept snapshots\n");
2142         return;
2143     }
2144
2145     saved_vm_running = runstate_is_running();
2146     vm_stop(RUN_STATE_SAVE_VM);
2147
2148     memset(sn, 0, sizeof(*sn));
2149
2150     /* fill auxiliary fields */
2151     qemu_gettimeofday(&tv);
2152     sn->date_sec = tv.tv_sec;
2153     sn->date_nsec = tv.tv_usec * 1000;
2154     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2155
2156     if (name) {
2157         ret = bdrv_snapshot_find(bs, old_sn, name);
2158         if (ret >= 0) {
2159             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2160             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2161         } else {
2162             pstrcpy(sn->name, sizeof(sn->name), name);
2163         }
2164     } else {
2165         /* cast below needed for OpenBSD where tv_sec is still 'long' */
2166         localtime_r((const time_t *)&tv.tv_sec, &tm);
2167         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2168     }
2169
2170     /* Delete old snapshots of the same name */
2171     if (name && del_existing_snapshots(mon, name) < 0) {
2172         goto the_end;
2173     }
2174
2175     /* save the VM state */
2176     f = qemu_fopen_bdrv(bs, 1);
2177     if (!f) {
2178         monitor_printf(mon, "Could not open VM state file\n");
2179         goto the_end;
2180     }
2181     ret = qemu_savevm_state(f);
2182     vm_state_size = qemu_ftell(f);
2183     qemu_fclose(f);
2184     if (ret < 0) {
2185         monitor_printf(mon, "Error %d while writing VM\n", ret);
2186         goto the_end;
2187     }
2188
2189     /* create the snapshots */
2190
2191     bs1 = NULL;
2192     while ((bs1 = bdrv_next(bs1))) {
2193         if (bdrv_can_snapshot(bs1)) {
2194             /* Write VM state size only to the image that contains the state */
2195             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2196             ret = bdrv_snapshot_create(bs1, sn);
2197             if (ret < 0) {
2198                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2199                                bdrv_get_device_name(bs1));
2200             }
2201         }
2202     }
2203
2204  the_end:
2205     if (saved_vm_running)
2206         vm_start();
2207 }
2208
2209 void qmp_xen_save_devices_state(const char *filename, Error **errp)
2210 {
2211     QEMUFile *f;
2212     int saved_vm_running;
2213     int ret;
2214
2215     saved_vm_running = runstate_is_running();
2216     vm_stop(RUN_STATE_SAVE_VM);
2217
2218     f = qemu_fopen(filename, "wb");
2219     if (!f) {
2220         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
2221         goto the_end;
2222     }
2223     ret = qemu_save_device_state(f);
2224     qemu_fclose(f);
2225     if (ret < 0) {
2226         error_set(errp, QERR_IO_ERROR);
2227     }
2228
2229  the_end:
2230     if (saved_vm_running)
2231         vm_start();
2232 }
2233
2234 int load_vmstate(const char *name)
2235 {
2236     BlockDriverState *bs, *bs_vm_state;
2237     QEMUSnapshotInfo sn;
2238     QEMUFile *f;
2239     int ret;
2240
2241     bs_vm_state = bdrv_snapshots();
2242     if (!bs_vm_state) {
2243         error_report("No block device supports snapshots");
2244         return -ENOTSUP;
2245     }
2246
2247     /* Don't even try to load empty VM states */
2248     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2249     if (ret < 0) {
2250         return ret;
2251     } else if (sn.vm_state_size == 0) {
2252         error_report("This is a disk-only snapshot. Revert to it offline "
2253             "using qemu-img.");
2254         return -EINVAL;
2255     }
2256
2257     /* Verify if there is any device that doesn't support snapshots and is
2258     writable and check if the requested snapshot is available too. */
2259     bs = NULL;
2260     while ((bs = bdrv_next(bs))) {
2261
2262         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2263             continue;
2264         }
2265
2266         if (!bdrv_can_snapshot(bs)) {
2267             error_report("Device '%s' is writable but does not support snapshots.",
2268                                bdrv_get_device_name(bs));
2269             return -ENOTSUP;
2270         }
2271
2272         ret = bdrv_snapshot_find(bs, &sn, name);
2273         if (ret < 0) {
2274             error_report("Device '%s' does not have the requested snapshot '%s'",
2275                            bdrv_get_device_name(bs), name);
2276             return ret;
2277         }
2278     }
2279
2280     /* Flush all IO requests so they don't interfere with the new state.  */
2281     bdrv_drain_all();
2282
2283     bs = NULL;
2284     while ((bs = bdrv_next(bs))) {
2285         if (bdrv_can_snapshot(bs)) {
2286             ret = bdrv_snapshot_goto(bs, name);
2287             if (ret < 0) {
2288                 error_report("Error %d while activating snapshot '%s' on '%s'",
2289                              ret, name, bdrv_get_device_name(bs));
2290                 return ret;
2291             }
2292         }
2293     }
2294
2295     /* restore the VM state */
2296     f = qemu_fopen_bdrv(bs_vm_state, 0);
2297     if (!f) {
2298         error_report("Could not open VM state file");
2299         return -EINVAL;
2300     }
2301
2302     qemu_system_reset(VMRESET_SILENT);
2303     ret = qemu_loadvm_state(f);
2304
2305     qemu_fclose(f);
2306     if (ret < 0) {
2307         error_report("Error %d while loading VM state", ret);
2308         return ret;
2309     }
2310
2311     return 0;
2312 }
2313
2314 void do_delvm(Monitor *mon, const QDict *qdict)
2315 {
2316     BlockDriverState *bs, *bs1;
2317     int ret;
2318     const char *name = qdict_get_str(qdict, "name");
2319
2320     bs = bdrv_snapshots();
2321     if (!bs) {
2322         monitor_printf(mon, "No block device supports snapshots\n");
2323         return;
2324     }
2325
2326     bs1 = NULL;
2327     while ((bs1 = bdrv_next(bs1))) {
2328         if (bdrv_can_snapshot(bs1)) {
2329             ret = bdrv_snapshot_delete(bs1, name);
2330             if (ret < 0) {
2331                 if (ret == -ENOTSUP)
2332                     monitor_printf(mon,
2333                                    "Snapshots not supported on device '%s'\n",
2334                                    bdrv_get_device_name(bs1));
2335                 else
2336                     monitor_printf(mon, "Error %d while deleting snapshot on "
2337                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2338             }
2339         }
2340     }
2341 }
2342
2343 void do_info_snapshots(Monitor *mon, const QDict *qdict)
2344 {
2345     BlockDriverState *bs, *bs1;
2346     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2347     int nb_sns, i, ret, available;
2348     int total;
2349     int *available_snapshots;
2350     char buf[256];
2351
2352     bs = bdrv_snapshots();
2353     if (!bs) {
2354         monitor_printf(mon, "No available block device supports snapshots\n");
2355         return;
2356     }
2357
2358     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2359     if (nb_sns < 0) {
2360         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2361         return;
2362     }
2363
2364     if (nb_sns == 0) {
2365         monitor_printf(mon, "There is no snapshot available.\n");
2366         return;
2367     }
2368
2369     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2370     total = 0;
2371     for (i = 0; i < nb_sns; i++) {
2372         sn = &sn_tab[i];
2373         available = 1;
2374         bs1 = NULL;
2375
2376         while ((bs1 = bdrv_next(bs1))) {
2377             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2378                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2379                 if (ret < 0) {
2380                     available = 0;
2381                     break;
2382                 }
2383             }
2384         }
2385
2386         if (available) {
2387             available_snapshots[total] = i;
2388             total++;
2389         }
2390     }
2391
2392     if (total > 0) {
2393         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2394         for (i = 0; i < total; i++) {
2395             sn = &sn_tab[available_snapshots[i]];
2396             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2397         }
2398     } else {
2399         monitor_printf(mon, "There is no suitable snapshot available\n");
2400     }
2401
2402     g_free(sn_tab);
2403     g_free(available_snapshots);
2404
2405 }
2406
2407 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2408 {
2409     qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
2410                        memory_region_name(mr), dev);
2411 }
2412
2413 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2414 {
2415     /* Nothing do to while the implementation is in RAMBlock */
2416 }
2417
2418 void vmstate_register_ram_global(MemoryRegion *mr)
2419 {
2420     vmstate_register_ram(mr, NULL);
2421 }