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 <time.h>
  27 #include <errno.h>
  28 #include <sys/time.h>
  29 #include <zlib.h>
  30
  31 /* Needed early for CONFIG_BSD etc. */
  32 #include "config-host.h"
  33
  34 #ifndef _WIN32
  35 #include <sys/times.h>
  36 #include <sys/wait.h>
  37 #include <termios.h>
  38 #include <sys/mman.h>
  39 #include <sys/ioctl.h>
  40 #include <sys/resource.h>
  41 #include <sys/socket.h>
  42 #include <netinet/in.h>
  43 #include <net/if.h>
  44 #include <arpa/inet.h>
  45 #include <dirent.h>
  46 #include <netdb.h>
  47 #include <sys/select.h>
  48 #ifdef CONFIG_BSD
  49 #include <sys/stat.h>
  50 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
  51 #include <libutil.h>
  52 #else
  53 #include <util.h>
  54 #endif
  55 #ifdef __linux__
  56 #include <pty.h>
  57 #include <malloc.h>
  58 #include <linux/rtc.h>
  59 #endif
  60 #endif
  61 #endif
  62
  63 #ifdef _WIN32
  64 #include <windows.h>
  65 #include <malloc.h>
  66 #include <sys/timeb.h>
  67 #include <mmsystem.h>
  68 #define getopt_long_only getopt_long
  69 #define memalign(align, size) malloc(size)
  70 #endif
  71
  72 #include "qemu-common.h"
  73 #include "hw/hw.h"
  74 #include "hw/qdev.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 "audio/audio.h"
  81 #include "migration.h"
  82 #include "qemu_socket.h"
  83 #include "qemu-queue.h"
  84 #include "qemu-timer.h"
  85 #include "cpus.h"
  86 #include "memory.h"
  87 #include "qmp-commands.h"
  88 #include "trace.h"
  89
  90 #define SELF_ANNOUNCE_ROUNDS 5
  91
  92 #ifndef ETH_P_RARP
  93 #define ETH_P_RARP 0x8035
  94 #endif
  95 #define ARP_HTYPE_ETH 0x0001
  96 #define ARP_PTYPE_IP 0x0800
  97 #define ARP_OP_REQUEST_REV 0x3
  98
  99 static int announce_self_create(uint8_t *buf,
 100                                 uint8_t *mac_addr)
 101 {
 102     /* Ethernet header. */
 103     memset(buf, 0xff, 6);         /* destination MAC addr */
 104     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
 105     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
 106
 107     /* RARP header. */
 108     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
 109     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
 110     *(buf + 18) = 6; /* hardware addr length (ethernet) */
 111     *(buf + 19) = 4; /* protocol addr length (IPv4) */
 112     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
 113     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
 114     memset(buf + 28, 0x00, 4);     /* source protocol addr */
 115     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
 116     memset(buf + 38, 0x00, 4);     /* target protocol addr */
 117
 118     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
 119     memset(buf + 42, 0x00, 18);
 120
 121     return 60; /* len (FCS will be added by hardware) */
 122 }
 123
 124 static void qemu_announce_self_iter(NICState *nic, void *opaque)
 125 {
 126     uint8_t buf[60];
 127     int len;
 128
 129     len = announce_self_create(buf, nic->conf->macaddr.a);
 130
 131     qemu_send_packet_raw(&nic->nc, buf, len);
 132 }
 133
 134
 135 static void qemu_announce_self_once(void *opaque)
 136 {
 137     static int count = SELF_ANNOUNCE_ROUNDS;
 138     QEMUTimer *timer = *(QEMUTimer **)opaque;
 139
 140     qemu_foreach_nic(qemu_announce_self_iter, NULL);
 141
 142     if (--count) {
 143         /* delay 50ms, 150ms, 250ms, ... */
 144         qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
 145                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
 146     } else {
 147             qemu_del_timer(timer);
 148             qemu_free_timer(timer);
 149     }
 150 }
 151
 152 void qemu_announce_self(void)
 153 {
 154         static QEMUTimer *timer;
 155         timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
 156         qemu_announce_self_once(&timer);
 157 }
 158
 159 /***********************************************************/
 160 /* savevm/loadvm support */
 161
 162 #define IO_BUF_SIZE 32768
 163
 164 struct QEMUFile {
 165     QEMUFilePutBufferFunc *put_buffer;
 166     QEMUFileGetBufferFunc *get_buffer;
 167     QEMUFileCloseFunc *close;
 168     QEMUFileRateLimit *rate_limit;
 169     QEMUFileSetRateLimit *set_rate_limit;
 170     QEMUFileGetRateLimit *get_rate_limit;
 171     void *opaque;
 172     int is_write;
 173
 174     int64_t buf_offset; /* start of buffer when writing, end of buffer
 175                            when reading */
 176     int buf_index;
 177     int buf_size; /* 0 when writing */
 178     uint8_t buf[IO_BUF_SIZE];
 179
 180     int last_error;
 181 };
 182
 183 typedef struct QEMUFileStdio
 184 {
 185     FILE *stdio_file;
 186     QEMUFile *file;
 187 } QEMUFileStdio;
 188
 189 typedef struct QEMUFileSocket
 190 {
 191     int fd;
 192     QEMUFile *file;
 193 } QEMUFileSocket;
 194
 195 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 196 {
 197     QEMUFileSocket *s = opaque;
 198     ssize_t len;
 199
 200     do {
 201         len = qemu_recv(s->fd, buf, size, 0);
 202     } while (len == -1 && socket_error() == EINTR);
 203
 204     if (len == -1)
 205         len = -socket_error();
 206
 207     return len;
 208 }
 209
 210 static int socket_close(void *opaque)
 211 {
 212     QEMUFileSocket *s = opaque;
 213     g_free(s);
 214     return 0;
 215 }
 216
 217 static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 218 {
 219     QEMUFileStdio *s = opaque;
 220     return fwrite(buf, 1, size, s->stdio_file);
 221 }
 222
 223 static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 224 {
 225     QEMUFileStdio *s = opaque;
 226     FILE *fp = s->stdio_file;
 227     int bytes;
 228
 229     do {
 230         clearerr(fp);
 231         bytes = fread(buf, 1, size, fp);
 232     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
 233     return bytes;
 234 }
 235
 236 static int stdio_pclose(void *opaque)
 237 {
 238     QEMUFileStdio *s = opaque;
 239     int ret;
 240     ret = pclose(s->stdio_file);
 241     if (ret == -1) {
 242         ret = -errno;
 243     }
 244     g_free(s);
 245     return ret;
 246 }
 247
 248 static int stdio_fclose(void *opaque)
 249 {
 250     QEMUFileStdio *s = opaque;
 251     int ret = 0;
 252     if (fclose(s->stdio_file) == EOF) {
 253         ret = -errno;
 254     }
 255     g_free(s);
 256     return ret;
 257 }
 258
 259 QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
 260 {
 261     QEMUFileStdio *s;
 262
 263     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 264         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 265         return NULL;
 266     }
 267
 268     s = g_malloc0(sizeof(QEMUFileStdio));
 269
 270     s->stdio_file = stdio_file;
 271
 272     if(mode[0] == 'r') {
 273         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose,
 274                                  NULL, NULL, NULL);
 275     } else {
 276         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose,
 277                                  NULL, NULL, NULL);
 278     }
 279     return s->file;
 280 }
 281
 282 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 283 {
 284     FILE *popen_file;
 285
 286     popen_file = popen(command, mode);
 287     if(popen_file == NULL) {
 288         return NULL;
 289     }
 290
 291     return qemu_popen(popen_file, mode);
 292 }
 293
 294 int qemu_stdio_fd(QEMUFile *f)
 295 {
 296     QEMUFileStdio *p;
 297     int fd;
 298
 299     p = (QEMUFileStdio *)f->opaque;
 300     fd = fileno(p->stdio_file);
 301
 302     return fd;
 303 }
 304
 305 QEMUFile *qemu_fdopen(int fd, const char *mode)
 306 {
 307     QEMUFileStdio *s;
 308
 309     if (mode == NULL ||
 310         (mode[0] != 'r' && mode[0] != 'w') ||
 311         mode[1] != 'b' || mode[2] != 0) {
 312         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
 313         return NULL;
 314     }
 315
 316     s = g_malloc0(sizeof(QEMUFileStdio));
 317     s->stdio_file = fdopen(fd, mode);
 318     if (!s->stdio_file)
 319         goto fail;
 320
 321     if(mode[0] == 'r') {
 322         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose,
 323                                  NULL, NULL, NULL);
 324     } else {
 325         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose,
 326                                  NULL, NULL, NULL);
 327     }
 328     return s->file;
 329
 330 fail:
 331     g_free(s);
 332     return NULL;
 333 }
 334
 335 QEMUFile *qemu_fopen_socket(int fd)
 336 {
 337     QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
 338
 339     s->fd = fd;
 340     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close,
 341                              NULL, NULL, NULL);
 342     return s->file;
 343 }
 344
 345 static int file_put_buffer(void *opaque, const uint8_t *buf,
 346                             int64_t pos, int size)
 347 {
 348     QEMUFileStdio *s = opaque;
 349     fseek(s->stdio_file, pos, SEEK_SET);
 350     return fwrite(buf, 1, size, s->stdio_file);
 351 }
 352
 353 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 354 {
 355     QEMUFileStdio *s = opaque;
 356     fseek(s->stdio_file, pos, SEEK_SET);
 357     return fread(buf, 1, size, s->stdio_file);
 358 }
 359
 360 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 361 {
 362     QEMUFileStdio *s;
 363
 364     if (mode == NULL ||
 365         (mode[0] != 'r' && mode[0] != 'w') ||
 366         mode[1] != 'b' || mode[2] != 0) {
 367         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
 368         return NULL;
 369     }
 370
 371     s = g_malloc0(sizeof(QEMUFileStdio));
 372
 373     s->stdio_file = fopen(filename, mode);
 374     if (!s->stdio_file)
 375         goto fail;
 376
 377     if(mode[0] == 'w') {
 378         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose,
 379                                  NULL, NULL, NULL);
 380     } else {
 381         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose,
 382                                NULL, NULL, NULL);
 383     }
 384     return s->file;
 385 fail:
 386     g_free(s);
 387     return NULL;
 388 }
 389
 390 static int block_put_buffer(void *opaque, const uint8_t *buf,
 391                            int64_t pos, int size)
 392 {
 393     bdrv_save_vmstate(opaque, buf, pos, size);
 394     return size;
 395 }
 396
 397 static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 398 {
 399     return bdrv_load_vmstate(opaque, buf, pos, size);
 400 }
 401
 402 static int bdrv_fclose(void *opaque)
 403 {
 404     return bdrv_flush(opaque);
 405 }
 406
 407 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
 408 {
 409     if (is_writable)
 410         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose,
 411                               NULL, NULL, NULL);
 412     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
 413 }
 414
 415 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 416                          QEMUFileGetBufferFunc *get_buffer,
 417                          QEMUFileCloseFunc *close,
 418                          QEMUFileRateLimit *rate_limit,
 419                          QEMUFileSetRateLimit *set_rate_limit,
 420                          QEMUFileGetRateLimit *get_rate_limit)
 421 {
 422     QEMUFile *f;
 423
 424     f = g_malloc0(sizeof(QEMUFile));
 425
 426     f->opaque = opaque;
 427     f->put_buffer = put_buffer;
 428     f->get_buffer = get_buffer;
 429     f->close = close;
 430     f->rate_limit = rate_limit;
 431     f->set_rate_limit = set_rate_limit;
 432     f->get_rate_limit = get_rate_limit;
 433     f->is_write = 0;
 434
 435     return f;
 436 }
 437
 438 int qemu_file_get_error(QEMUFile *f)
 439 {
 440     return f->last_error;
 441 }
 442
 443 static void qemu_file_set_error(QEMUFile *f, int ret)
 444 {
 445     f->last_error = ret;
 446 }
 447
 448 /** Flushes QEMUFile buffer
 449  *
 450  */
 451 static int qemu_fflush(QEMUFile *f)
 452 {
 453     int ret = 0;
 454
 455     if (!f->put_buffer)
 456         return 0;
 457
 458     if (f->is_write && f->buf_index > 0) {
 459         ret = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 460         if (ret >= 0) {
 461             f->buf_offset += f->buf_index;
 462         }
 463         f->buf_index = 0;
 464     }
 465     return ret;
 466 }
 467
 468 static void qemu_fill_buffer(QEMUFile *f)
 469 {
 470     int len;
 471     int pending;
 472
 473     if (!f->get_buffer)
 474         return;
 475
 476     if (f->is_write)
 477         abort();
 478
 479     pending = f->buf_size - f->buf_index;
 480     if (pending > 0) {
 481         memmove(f->buf, f->buf + f->buf_index, pending);
 482     }
 483     f->buf_index = 0;
 484     f->buf_size = pending;
 485
 486     len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
 487                         IO_BUF_SIZE - pending);
 488     if (len > 0) {
 489         f->buf_size += len;
 490         f->buf_offset += len;
 491     } else if (len == 0) {
 492         qemu_file_set_error(f, -EIO);
 493     } else if (len != -EAGAIN)
 494         qemu_file_set_error(f, len);
 495 }
 496
 497 /** Closes the file
 498  *
 499  * Returns negative error value if any error happened on previous operations or
 500  * while closing the file. Returns 0 or positive number on success.
 501  *
 502  * The meaning of return value on success depends on the specific backend
 503  * being used.
 504  */
 505 int qemu_fclose(QEMUFile *f)
 506 {
 507     int ret;
 508     ret = qemu_fflush(f);
 509
 510     if (f->close) {
 511         int ret2 = f->close(f->opaque);
 512         if (ret >= 0) {
 513             ret = ret2;
 514         }
 515     }
 516     /* If any error was spotted before closing, we should report it
 517      * instead of the close() return value.
 518      */
 519     if (f->last_error) {
 520         ret = f->last_error;
 521     }
 522     g_free(f);
 523     return ret;
 524 }
 525
 526 int qemu_file_put_notify(QEMUFile *f)
 527 {
 528     return f->put_buffer(f->opaque, NULL, 0, 0);
 529 }
 530
 531 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 532 {
 533     int l;
 534
 535     if (f->last_error) {
 536         return;
 537     }
 538
 539     if (f->is_write == 0 && f->buf_index > 0) {
 540         fprintf(stderr,
 541                 "Attempted to write to buffer while read buffer is not empty\n");
 542         abort();
 543     }
 544
 545     while (size > 0) {
 546         l = IO_BUF_SIZE - f->buf_index;
 547         if (l > size)
 548             l = size;
 549         memcpy(f->buf + f->buf_index, buf, l);
 550         f->is_write = 1;
 551         f->buf_index += l;
 552         buf += l;
 553         size -= l;
 554         if (f->buf_index >= IO_BUF_SIZE) {
 555             int ret = qemu_fflush(f);
 556             if (ret < 0) {
 557                 qemu_file_set_error(f, ret);
 558                 break;
 559             }
 560         }
 561     }
 562 }
 563
 564 void qemu_put_byte(QEMUFile *f, int v)
 565 {
 566     if (f->last_error) {
 567         return;
 568     }
 569
 570     if (f->is_write == 0 && f->buf_index > 0) {
 571         fprintf(stderr,
 572                 "Attempted to write to buffer while read buffer is not empty\n");
 573         abort();
 574     }
 575
 576     f->buf[f->buf_index++] = v;
 577     f->is_write = 1;
 578     if (f->buf_index >= IO_BUF_SIZE) {
 579         int ret = qemu_fflush(f);
 580         if (ret < 0) {
 581             qemu_file_set_error(f, ret);
 582         }
 583     }
 584 }
 585
 586 static void qemu_file_skip(QEMUFile *f, int size)
 587 {
 588     if (f->buf_index + size <= f->buf_size) {
 589         f->buf_index += size;
 590     }
 591 }
 592
 593 static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
 594 {
 595     int pending;
 596     int index;
 597
 598     if (f->is_write) {
 599         abort();
 600     }
 601
 602     index = f->buf_index + offset;
 603     pending = f->buf_size - index;
 604     if (pending < size) {
 605         qemu_fill_buffer(f);
 606         index = f->buf_index + offset;
 607         pending = f->buf_size - index;
 608     }
 609
 610     if (pending <= 0) {
 611         return 0;
 612     }
 613     if (size > pending) {
 614         size = pending;
 615     }
 616
 617     memcpy(buf, f->buf + index, size);
 618     return size;
 619 }
 620
 621 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
 622 {
 623     int pending = size;
 624     int done = 0;
 625
 626     while (pending > 0) {
 627         int res;
 628
 629         res = qemu_peek_buffer(f, buf, pending, 0);
 630         if (res == 0) {
 631             return done;
 632         }
 633         qemu_file_skip(f, res);
 634         buf += res;
 635         pending -= res;
 636         done += res;
 637     }
 638     return done;
 639 }
 640
 641 static int qemu_peek_byte(QEMUFile *f, int offset)
 642 {
 643     int index = f->buf_index + offset;
 644
 645     if (f->is_write) {
 646         abort();
 647     }
 648
 649     if (index >= f->buf_size) {
 650         qemu_fill_buffer(f);
 651         index = f->buf_index + offset;
 652         if (index >= f->buf_size) {
 653             return 0;
 654         }
 655     }
 656     return f->buf[index];
 657 }
 658
 659 int qemu_get_byte(QEMUFile *f)
 660 {
 661     int result;
 662
 663     result = qemu_peek_byte(f, 0);
 664     qemu_file_skip(f, 1);
 665     return result;
 666 }
 667
 668 static int64_t qemu_ftell(QEMUFile *f)
 669 {
 670     return f->buf_offset - f->buf_size + f->buf_index;
 671 }
 672
 673 int qemu_file_rate_limit(QEMUFile *f)
 674 {
 675     if (f->rate_limit)
 676         return f->rate_limit(f->opaque);
 677
 678     return 0;
 679 }
 680
 681 int64_t qemu_file_get_rate_limit(QEMUFile *f)
 682 {
 683     if (f->get_rate_limit)
 684         return f->get_rate_limit(f->opaque);
 685
 686     return 0;
 687 }
 688
 689 int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
 690 {
 691     /* any failed or completed migration keeps its state to allow probing of
 692      * migration data, but has no associated file anymore */
 693     if (f && f->set_rate_limit)
 694         return f->set_rate_limit(f->opaque, new_rate);
 695
 696     return 0;
 697 }
 698
 699 void qemu_put_be16(QEMUFile *f, unsigned int v)
 700 {
 701     qemu_put_byte(f, v >> 8);
 702     qemu_put_byte(f, v);
 703 }
 704
 705 void qemu_put_be32(QEMUFile *f, unsigned int v)
 706 {
 707     qemu_put_byte(f, v >> 24);
 708     qemu_put_byte(f, v >> 16);
 709     qemu_put_byte(f, v >> 8);
 710     qemu_put_byte(f, v);
 711 }
 712
 713 void qemu_put_be64(QEMUFile *f, uint64_t v)
 714 {
 715     qemu_put_be32(f, v >> 32);
 716     qemu_put_be32(f, v);
 717 }
 718
 719 unsigned int qemu_get_be16(QEMUFile *f)
 720 {
 721     unsigned int v;
 722     v = qemu_get_byte(f) << 8;
 723     v |= qemu_get_byte(f);
 724     return v;
 725 }
 726
 727 unsigned int qemu_get_be32(QEMUFile *f)
 728 {
 729     unsigned int v;
 730     v = qemu_get_byte(f) << 24;
 731     v |= qemu_get_byte(f) << 16;
 732     v |= qemu_get_byte(f) << 8;
 733     v |= qemu_get_byte(f);
 734     return v;
 735 }
 736
 737 uint64_t qemu_get_be64(QEMUFile *f)
 738 {
 739     uint64_t v;
 740     v = (uint64_t)qemu_get_be32(f) << 32;
 741     v |= qemu_get_be32(f);
 742     return v;
 743 }
 744
 745
 746 /* timer */
 747
 748 void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
 749 {
 750     uint64_t expire_time;
 751
 752     expire_time = qemu_timer_expire_time_ns(ts);
 753     qemu_put_be64(f, expire_time);
 754 }
 755
 756 void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
 757 {
 758     uint64_t expire_time;
 759
 760     expire_time = qemu_get_be64(f);
 761     if (expire_time != -1) {
 762         qemu_mod_timer_ns(ts, expire_time);
 763     } else {
 764         qemu_del_timer(ts);
 765     }
 766 }
 767
 768
 769 /* bool */
 770
 771 static int get_bool(QEMUFile *f, void *pv, size_t size)
 772 {
 773     bool *v = pv;
 774     *v = qemu_get_byte(f);
 775     return 0;
 776 }
 777
 778 static void put_bool(QEMUFile *f, void *pv, size_t size)
 779 {
 780     bool *v = pv;
 781     qemu_put_byte(f, *v);
 782 }
 783
 784 const VMStateInfo vmstate_info_bool = {
 785     .name = "bool",
 786     .get  = get_bool,
 787     .put  = put_bool,
 788 };
 789
 790 /* 8 bit int */
 791
 792 static int get_int8(QEMUFile *f, void *pv, size_t size)
 793 {
 794     int8_t *v = pv;
 795     qemu_get_s8s(f, v);
 796     return 0;
 797 }
 798
 799 static void put_int8(QEMUFile *f, void *pv, size_t size)
 800 {
 801     int8_t *v = pv;
 802     qemu_put_s8s(f, v);
 803 }
 804
 805 const VMStateInfo vmstate_info_int8 = {
 806     .name = "int8",
 807     .get  = get_int8,
 808     .put  = put_int8,
 809 };
 810
 811 /* 16 bit int */
 812
 813 static int get_int16(QEMUFile *f, void *pv, size_t size)
 814 {
 815     int16_t *v = pv;
 816     qemu_get_sbe16s(f, v);
 817     return 0;
 818 }
 819
 820 static void put_int16(QEMUFile *f, void *pv, size_t size)
 821 {
 822     int16_t *v = pv;
 823     qemu_put_sbe16s(f, v);
 824 }
 825
 826 const VMStateInfo vmstate_info_int16 = {
 827     .name = "int16",
 828     .get  = get_int16,
 829     .put  = put_int16,
 830 };
 831
 832 /* 32 bit int */
 833
 834 static int get_int32(QEMUFile *f, void *pv, size_t size)
 835 {
 836     int32_t *v = pv;
 837     qemu_get_sbe32s(f, v);
 838     return 0;
 839 }
 840
 841 static void put_int32(QEMUFile *f, void *pv, size_t size)
 842 {
 843     int32_t *v = pv;
 844     qemu_put_sbe32s(f, v);
 845 }
 846
 847 const VMStateInfo vmstate_info_int32 = {
 848     .name = "int32",
 849     .get  = get_int32,
 850     .put  = put_int32,
 851 };
 852
 853 /* 32 bit int. See that the received value is the same than the one
 854    in the field */
 855
 856 static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
 857 {
 858     int32_t *v = pv;
 859     int32_t v2;
 860     qemu_get_sbe32s(f, &v2);
 861
 862     if (*v == v2)
 863         return 0;
 864     return -EINVAL;
 865 }
 866
 867 const VMStateInfo vmstate_info_int32_equal = {
 868     .name = "int32 equal",
 869     .get  = get_int32_equal,
 870     .put  = put_int32,
 871 };
 872
 873 /* 32 bit int. See that the received value is the less or the same
 874    than the one in the field */
 875
 876 static int get_int32_le(QEMUFile *f, void *pv, size_t size)
 877 {
 878     int32_t *old = pv;
 879     int32_t new;
 880     qemu_get_sbe32s(f, &new);
 881
 882     if (*old <= new)
 883         return 0;
 884     return -EINVAL;
 885 }
 886
 887 const VMStateInfo vmstate_info_int32_le = {
 888     .name = "int32 equal",
 889     .get  = get_int32_le,
 890     .put  = put_int32,
 891 };
 892
 893 /* 64 bit int */
 894
 895 static int get_int64(QEMUFile *f, void *pv, size_t size)
 896 {
 897     int64_t *v = pv;
 898     qemu_get_sbe64s(f, v);
 899     return 0;
 900 }
 901
 902 static void put_int64(QEMUFile *f, void *pv, size_t size)
 903 {
 904     int64_t *v = pv;
 905     qemu_put_sbe64s(f, v);
 906 }
 907
 908 const VMStateInfo vmstate_info_int64 = {
 909     .name = "int64",
 910     .get  = get_int64,
 911     .put  = put_int64,
 912 };
 913
 914 /* 8 bit unsigned int */
 915
 916 static int get_uint8(QEMUFile *f, void *pv, size_t size)
 917 {
 918     uint8_t *v = pv;
 919     qemu_get_8s(f, v);
 920     return 0;
 921 }
 922
 923 static void put_uint8(QEMUFile *f, void *pv, size_t size)
 924 {
 925     uint8_t *v = pv;
 926     qemu_put_8s(f, v);
 927 }
 928
 929 const VMStateInfo vmstate_info_uint8 = {
 930     .name = "uint8",
 931     .get  = get_uint8,
 932     .put  = put_uint8,
 933 };
 934
 935 /* 16 bit unsigned int */
 936
 937 static int get_uint16(QEMUFile *f, void *pv, size_t size)
 938 {
 939     uint16_t *v = pv;
 940     qemu_get_be16s(f, v);
 941     return 0;
 942 }
 943
 944 static void put_uint16(QEMUFile *f, void *pv, size_t size)
 945 {
 946     uint16_t *v = pv;
 947     qemu_put_be16s(f, v);
 948 }
 949
 950 const VMStateInfo vmstate_info_uint16 = {
 951     .name = "uint16",
 952     .get  = get_uint16,
 953     .put  = put_uint16,
 954 };
 955
 956 /* 32 bit unsigned int */
 957
 958 static int get_uint32(QEMUFile *f, void *pv, size_t size)
 959 {
 960     uint32_t *v = pv;
 961     qemu_get_be32s(f, v);
 962     return 0;
 963 }
 964
 965 static void put_uint32(QEMUFile *f, void *pv, size_t size)
 966 {
 967     uint32_t *v = pv;
 968     qemu_put_be32s(f, v);
 969 }
 970
 971 const VMStateInfo vmstate_info_uint32 = {
 972     .name = "uint32",
 973     .get  = get_uint32,
 974     .put  = put_uint32,
 975 };
 976
 977 /* 32 bit uint. See that the received value is the same than the one
 978    in the field */
 979
 980 static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
 981 {
 982     uint32_t *v = pv;
 983     uint32_t v2;
 984     qemu_get_be32s(f, &v2);
 985
 986     if (*v == v2) {
 987         return 0;
 988     }
 989     return -EINVAL;
 990 }
 991
 992 const VMStateInfo vmstate_info_uint32_equal = {
 993     .name = "uint32 equal",
 994     .get  = get_uint32_equal,
 995     .put  = put_uint32,
 996 };
 997
 998 /* 64 bit unsigned int */
 999
1000 static int get_uint64(QEMUFile *f, void *pv, size_t size)
1001 {
1002     uint64_t *v = pv;
1003     qemu_get_be64s(f, v);
1004     return 0;
1005 }
1006
1007 static void put_uint64(QEMUFile *f, void *pv, size_t size)
1008 {
1009     uint64_t *v = pv;
1010     qemu_put_be64s(f, v);
1011 }
1012
1013 const VMStateInfo vmstate_info_uint64 = {
1014     .name = "uint64",
1015     .get  = get_uint64,
1016     .put  = put_uint64,
1017 };
1018
1019 /* 8 bit int. See that the received value is the same than the one
1020    in the field */
1021
1022 static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
1023 {
1024     uint8_t *v = pv;
1025     uint8_t v2;
1026     qemu_get_8s(f, &v2);
1027
1028     if (*v == v2)
1029         return 0;
1030     return -EINVAL;
1031 }
1032
1033 const VMStateInfo vmstate_info_uint8_equal = {
1034     .name = "uint8 equal",
1035     .get  = get_uint8_equal,
1036     .put  = put_uint8,
1037 };
1038
1039 /* 16 bit unsigned int int. See that the received value is the same than the one
1040    in the field */
1041
1042 static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
1043 {
1044     uint16_t *v = pv;
1045     uint16_t v2;
1046     qemu_get_be16s(f, &v2);
1047
1048     if (*v == v2)
1049         return 0;
1050     return -EINVAL;
1051 }
1052
1053 const VMStateInfo vmstate_info_uint16_equal = {
1054     .name = "uint16 equal",
1055     .get  = get_uint16_equal,
1056     .put  = put_uint16,
1057 };
1058
1059 /* timers  */
1060
1061 static int get_timer(QEMUFile *f, void *pv, size_t size)
1062 {
1063     QEMUTimer *v = pv;
1064     qemu_get_timer(f, v);
1065     return 0;
1066 }
1067
1068 static void put_timer(QEMUFile *f, void *pv, size_t size)
1069 {
1070     QEMUTimer *v = pv;
1071     qemu_put_timer(f, v);
1072 }
1073
1074 const VMStateInfo vmstate_info_timer = {
1075     .name = "timer",
1076     .get  = get_timer,
1077     .put  = put_timer,
1078 };
1079
1080 /* uint8_t buffers */
1081
1082 static int get_buffer(QEMUFile *f, void *pv, size_t size)
1083 {
1084     uint8_t *v = pv;
1085     qemu_get_buffer(f, v, size);
1086     return 0;
1087 }
1088
1089 static void put_buffer(QEMUFile *f, void *pv, size_t size)
1090 {
1091     uint8_t *v = pv;
1092     qemu_put_buffer(f, v, size);
1093 }
1094
1095 const VMStateInfo vmstate_info_buffer = {
1096     .name = "buffer",
1097     .get  = get_buffer,
1098     .put  = put_buffer,
1099 };
1100
1101 /* unused buffers: space that was used for some fields that are
1102    not useful anymore */
1103
1104 static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
1105 {
1106     uint8_t buf[1024];
1107     int block_len;
1108
1109     while (size > 0) {
1110         block_len = MIN(sizeof(buf), size);
1111         size -= block_len;
1112         qemu_get_buffer(f, buf, block_len);
1113     }
1114    return 0;
1115 }
1116
1117 static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
1118 {
1119     static const 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_put_buffer(f, buf, block_len);
1126     }
1127 }
1128
1129 const VMStateInfo vmstate_info_unused_buffer = {
1130     .name = "unused_buffer",
1131     .get  = get_unused_buffer,
1132     .put  = put_unused_buffer,
1133 };
1134
1135 typedef struct CompatEntry {
1136     char idstr[256];
1137     int instance_id;
1138 } CompatEntry;
1139
1140 typedef struct SaveStateEntry {
1141     QTAILQ_ENTRY(SaveStateEntry) entry;
1142     char idstr[256];
1143     int instance_id;
1144     int alias_id;
1145     int version_id;
1146     int section_id;
1147     SaveVMHandlers *ops;
1148     const VMStateDescription *vmsd;
1149     void *opaque;
1150     CompatEntry *compat;
1151     int no_migrate;
1152     int is_ram;
1153 } SaveStateEntry;
1154
1155
1156 static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
1157     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1158 static int global_section_id;
1159
1160 static int calculate_new_instance_id(const char *idstr)
1161 {
1162     SaveStateEntry *se;
1163     int instance_id = 0;
1164
1165     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1166         if (strcmp(idstr, se->idstr) == 0
1167             && instance_id <= se->instance_id) {
1168             instance_id = se->instance_id + 1;
1169         }
1170     }
1171     return instance_id;
1172 }
1173
1174 static int calculate_compat_instance_id(const char *idstr)
1175 {
1176     SaveStateEntry *se;
1177     int instance_id = 0;
1178
1179     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1180         if (!se->compat)
1181             continue;
1182
1183         if (strcmp(idstr, se->compat->idstr) == 0
1184             && instance_id <= se->compat->instance_id) {
1185             instance_id = se->compat->instance_id + 1;
1186         }
1187     }
1188     return instance_id;
1189 }
1190
1191 /* TODO: Individual devices generally have very little idea about the rest
1192    of the system, so instance_id should be removed/replaced.
1193    Meanwhile pass -1 as instance_id if you do not already have a clearly
1194    distinguishing id for all instances of your device class. */
1195 int register_savevm_live(DeviceState *dev,
1196                          const char *idstr,
1197                          int instance_id,
1198                          int version_id,
1199                          SaveVMHandlers *ops,
1200                          void *opaque)
1201 {
1202     SaveStateEntry *se;
1203
1204     se = g_malloc0(sizeof(SaveStateEntry));
1205     se->version_id = version_id;
1206     se->section_id = global_section_id++;
1207     se->ops = ops;
1208     se->opaque = opaque;
1209     se->vmsd = NULL;
1210     se->no_migrate = 0;
1211     /* if this is a live_savem then set is_ram */
1212     if (ops->save_live_setup != NULL) {
1213         se->is_ram = 1;
1214     }
1215
1216     if (dev) {
1217         char *id = qdev_get_dev_path(dev);
1218         if (id) {
1219             pstrcpy(se->idstr, sizeof(se->idstr), id);
1220             pstrcat(se->idstr, sizeof(se->idstr), "/");
1221             g_free(id);
1222
1223             se->compat = g_malloc0(sizeof(CompatEntry));
1224             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
1225             se->compat->instance_id = instance_id == -1 ?
1226                          calculate_compat_instance_id(idstr) : instance_id;
1227             instance_id = -1;
1228         }
1229     }
1230     pstrcat(se->idstr, sizeof(se->idstr), idstr);
1231
1232     if (instance_id == -1) {
1233         se->instance_id = calculate_new_instance_id(se->idstr);
1234     } else {
1235         se->instance_id = instance_id;
1236     }
1237     assert(!se->compat || se->instance_id == 0);
1238     /* add at the end of list */
1239     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1240     return 0;
1241 }
1242
1243 int register_savevm(DeviceState *dev,
1244                     const char *idstr,
1245                     int instance_id,
1246                     int version_id,
1247                     SaveStateHandler *save_state,
1248                     LoadStateHandler *load_state,
1249                     void *opaque)
1250 {
1251     SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
1252     ops->save_state = save_state;
1253     ops->load_state = load_state;
1254     return register_savevm_live(dev, idstr, instance_id, version_id,
1255                                 ops, opaque);
1256 }
1257
1258 void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1259 {
1260     SaveStateEntry *se, *new_se;
1261     char id[256] = "";
1262
1263     if (dev) {
1264         char *path = qdev_get_dev_path(dev);
1265         if (path) {
1266             pstrcpy(id, sizeof(id), path);
1267             pstrcat(id, sizeof(id), "/");
1268             g_free(path);
1269         }
1270     }
1271     pstrcat(id, sizeof(id), idstr);
1272
1273     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1274         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
1275             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1276             if (se->compat) {
1277                 g_free(se->compat);
1278             }
1279             g_free(se->ops);
1280             g_free(se);
1281         }
1282     }
1283 }
1284
1285 int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
1286                                    const VMStateDescription *vmsd,
1287                                    void *opaque, int alias_id,
1288                                    int required_for_version)
1289 {
1290     SaveStateEntry *se;
1291
1292     /* If this triggers, alias support can be dropped for the vmsd. */
1293     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
1294
1295     se = g_malloc0(sizeof(SaveStateEntry));
1296     se->version_id = vmsd->version_id;
1297     se->section_id = global_section_id++;
1298     se->opaque = opaque;
1299     se->vmsd = vmsd;
1300     se->alias_id = alias_id;
1301     se->no_migrate = vmsd->unmigratable;
1302
1303     if (dev) {
1304         char *id = qdev_get_dev_path(dev);
1305         if (id) {
1306             pstrcpy(se->idstr, sizeof(se->idstr), id);
1307             pstrcat(se->idstr, sizeof(se->idstr), "/");
1308             g_free(id);
1309
1310             se->compat = g_malloc0(sizeof(CompatEntry));
1311             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
1312             se->compat->instance_id = instance_id == -1 ?
1313                          calculate_compat_instance_id(vmsd->name) : instance_id;
1314             instance_id = -1;
1315         }
1316     }
1317     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
1318
1319     if (instance_id == -1) {
1320         se->instance_id = calculate_new_instance_id(se->idstr);
1321     } else {
1322         se->instance_id = instance_id;
1323     }
1324     assert(!se->compat || se->instance_id == 0);
1325     /* add at the end of list */
1326     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1327     return 0;
1328 }
1329
1330 int vmstate_register(DeviceState *dev, int instance_id,
1331                      const VMStateDescription *vmsd, void *opaque)
1332 {
1333     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
1334                                           opaque, -1, 0);
1335 }
1336
1337 void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
1338                         void *opaque)
1339 {
1340     SaveStateEntry *se, *new_se;
1341
1342     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1343         if (se->vmsd == vmsd && se->opaque == opaque) {
1344             QTAILQ_REMOVE(&savevm_handlers, se, entry);
1345             if (se->compat) {
1346                 g_free(se->compat);
1347             }
1348             g_free(se);
1349         }
1350     }
1351 }
1352
1353 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1354                                     void *opaque);
1355 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1356                                    void *opaque);
1357
1358 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
1359                        void *opaque, int version_id)
1360 {
1361     VMStateField *field = vmsd->fields;
1362     int ret;
1363
1364     if (version_id > vmsd->version_id) {
1365         return -EINVAL;
1366     }
1367     if (version_id < vmsd->minimum_version_id_old) {
1368         return -EINVAL;
1369     }
1370     if  (version_id < vmsd->minimum_version_id) {
1371         return vmsd->load_state_old(f, opaque, version_id);
1372     }
1373     if (vmsd->pre_load) {
1374         int ret = vmsd->pre_load(opaque);
1375         if (ret)
1376             return ret;
1377     }
1378     while(field->name) {
1379         if ((field->field_exists &&
1380              field->field_exists(opaque, version_id)) ||
1381             (!field->field_exists &&
1382              field->version_id <= version_id)) {
1383             void *base_addr = opaque + field->offset;
1384             int i, n_elems = 1;
1385             int size = field->size;
1386
1387             if (field->flags & VMS_VBUFFER) {
1388                 size = *(int32_t *)(opaque+field->size_offset);
1389                 if (field->flags & VMS_MULTIPLY) {
1390                     size *= field->size;
1391                 }
1392             }
1393             if (field->flags & VMS_ARRAY) {
1394                 n_elems = field->num;
1395             } else if (field->flags & VMS_VARRAY_INT32) {
1396                 n_elems = *(int32_t *)(opaque+field->num_offset);
1397             } else if (field->flags & VMS_VARRAY_UINT32) {
1398                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1399             } else if (field->flags & VMS_VARRAY_UINT16) {
1400                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1401             } else if (field->flags & VMS_VARRAY_UINT8) {
1402                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1403             }
1404             if (field->flags & VMS_POINTER) {
1405                 base_addr = *(void **)base_addr + field->start;
1406             }
1407             for (i = 0; i < n_elems; i++) {
1408                 void *addr = base_addr + size * i;
1409
1410                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1411                     addr = *(void **)addr;
1412                 }
1413                 if (field->flags & VMS_STRUCT) {
1414                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
1415                 } else {
1416                     ret = field->info->get(f, addr, size);
1417
1418                 }
1419                 if (ret < 0) {
1420                     return ret;
1421                 }
1422             }
1423         }
1424         field++;
1425     }
1426     ret = vmstate_subsection_load(f, vmsd, opaque);
1427     if (ret != 0) {
1428         return ret;
1429     }
1430     if (vmsd->post_load) {
1431         return vmsd->post_load(opaque, version_id);
1432     }
1433     return 0;
1434 }
1435
1436 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1437                         void *opaque)
1438 {
1439     VMStateField *field = vmsd->fields;
1440
1441     if (vmsd->pre_save) {
1442         vmsd->pre_save(opaque);
1443     }
1444     while(field->name) {
1445         if (!field->field_exists ||
1446             field->field_exists(opaque, vmsd->version_id)) {
1447             void *base_addr = opaque + field->offset;
1448             int i, n_elems = 1;
1449             int size = field->size;
1450
1451             if (field->flags & VMS_VBUFFER) {
1452                 size = *(int32_t *)(opaque+field->size_offset);
1453                 if (field->flags & VMS_MULTIPLY) {
1454                     size *= field->size;
1455                 }
1456             }
1457             if (field->flags & VMS_ARRAY) {
1458                 n_elems = field->num;
1459             } else if (field->flags & VMS_VARRAY_INT32) {
1460                 n_elems = *(int32_t *)(opaque+field->num_offset);
1461             } else if (field->flags & VMS_VARRAY_UINT32) {
1462                 n_elems = *(uint32_t *)(opaque+field->num_offset);
1463             } else if (field->flags & VMS_VARRAY_UINT16) {
1464                 n_elems = *(uint16_t *)(opaque+field->num_offset);
1465             } else if (field->flags & VMS_VARRAY_UINT8) {
1466                 n_elems = *(uint8_t *)(opaque+field->num_offset);
1467             }
1468             if (field->flags & VMS_POINTER) {
1469                 base_addr = *(void **)base_addr + field->start;
1470             }
1471             for (i = 0; i < n_elems; i++) {
1472                 void *addr = base_addr + size * i;
1473
1474                 if (field->flags & VMS_ARRAY_OF_POINTER) {
1475                     addr = *(void **)addr;
1476                 }
1477                 if (field->flags & VMS_STRUCT) {
1478                     vmstate_save_state(f, field->vmsd, addr);
1479                 } else {
1480                     field->info->put(f, addr, size);
1481                 }
1482             }
1483         }
1484         field++;
1485     }
1486     vmstate_subsection_save(f, vmsd, opaque);
1487 }
1488
1489 static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
1490 {
1491     if (!se->vmsd) {         /* Old style */
1492         return se->ops->load_state(f, se->opaque, version_id);
1493     }
1494     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1495 }
1496
1497 static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
1498 {
1499     if (!se->vmsd) {         /* Old style */
1500         se->ops->save_state(f, se->opaque);
1501         return;
1502     }
1503     vmstate_save_state(f,se->vmsd, se->opaque);
1504 }
1505
1506 #define QEMU_VM_FILE_MAGIC           0x5145564d
1507 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
1508 #define QEMU_VM_FILE_VERSION         0x00000003
1509
1510 #define QEMU_VM_EOF                  0x00
1511 #define QEMU_VM_SECTION_START        0x01
1512 #define QEMU_VM_SECTION_PART         0x02
1513 #define QEMU_VM_SECTION_END          0x03
1514 #define QEMU_VM_SECTION_FULL         0x04
1515 #define QEMU_VM_SUBSECTION           0x05
1516
1517 bool qemu_savevm_state_blocked(Error **errp)
1518 {
1519     SaveStateEntry *se;
1520
1521     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1522         if (se->no_migrate) {
1523             error_set(errp, QERR_MIGRATION_NOT_SUPPORTED, se->idstr);
1524             return true;
1525         }
1526     }
1527     return false;
1528 }
1529
1530 int qemu_savevm_state_begin(QEMUFile *f,
1531                             const MigrationParams *params)
1532 {
1533     SaveStateEntry *se;
1534     int ret;
1535
1536     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1537         if (!se->ops || !se->ops->set_params) {
1538             continue;
1539         }
1540         se->ops->set_params(params, se->opaque);
1541     }
1542
1543     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1544     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1545
1546     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1547         int len;
1548
1549         if (!se->ops || !se->ops->save_live_setup) {
1550             continue;
1551         }
1552         if (se->ops && se->ops->is_active) {
1553             if (!se->ops->is_active(se->opaque)) {
1554                 continue;
1555             }
1556         }
1557         /* Section type */
1558         qemu_put_byte(f, QEMU_VM_SECTION_START);
1559         qemu_put_be32(f, se->section_id);
1560
1561         /* ID string */
1562         len = strlen(se->idstr);
1563         qemu_put_byte(f, len);
1564         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1565
1566         qemu_put_be32(f, se->instance_id);
1567         qemu_put_be32(f, se->version_id);
1568
1569         ret = se->ops->save_live_setup(f, se->opaque);
1570         if (ret < 0) {
1571             qemu_savevm_state_cancel(f);
1572             return ret;
1573         }
1574     }
1575     ret = qemu_file_get_error(f);
1576     if (ret != 0) {
1577         qemu_savevm_state_cancel(f);
1578     }
1579
1580     return ret;
1581
1582 }
1583
1584 /*
1585  * this function has three return values:
1586  *   negative: there was one error, and we have -errno.
1587  *   0 : We haven't finished, caller have to go again
1588  *   1 : We have finished, we can go to complete phase
1589  */
1590 int qemu_savevm_state_iterate(QEMUFile *f)
1591 {
1592     SaveStateEntry *se;
1593     int ret = 1;
1594
1595     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1596         if (!se->ops || !se->ops->save_live_iterate) {
1597             continue;
1598         }
1599         if (se->ops && se->ops->is_active) {
1600             if (!se->ops->is_active(se->opaque)) {
1601                 continue;
1602             }
1603         }
1604         if (qemu_file_rate_limit(f)) {
1605             return 0;
1606         }
1607         trace_savevm_section_start();
1608         /* Section type */
1609         qemu_put_byte(f, QEMU_VM_SECTION_PART);
1610         qemu_put_be32(f, se->section_id);
1611
1612         ret = se->ops->save_live_iterate(f, se->opaque);
1613         trace_savevm_section_end(se->section_id);
1614
1615         if (ret <= 0) {
1616             /* Do not proceed to the next vmstate before this one reported
1617                completion of the current stage. This serializes the migration
1618                and reduces the probability that a faster changing state is
1619                synchronized over and over again. */
1620             break;
1621         }
1622     }
1623     if (ret != 0) {
1624         return ret;
1625     }
1626     ret = qemu_file_get_error(f);
1627     if (ret != 0) {
1628         qemu_savevm_state_cancel(f);
1629     }
1630     return ret;
1631 }
1632
1633 int qemu_savevm_state_complete(QEMUFile *f)
1634 {
1635     SaveStateEntry *se;
1636     int ret;
1637
1638     cpu_synchronize_all_states();
1639
1640     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1641         if (!se->ops || !se->ops->save_live_complete) {
1642             continue;
1643         }
1644         if (se->ops && se->ops->is_active) {
1645             if (!se->ops->is_active(se->opaque)) {
1646                 continue;
1647             }
1648         }
1649         trace_savevm_section_start();
1650         /* Section type */
1651         qemu_put_byte(f, QEMU_VM_SECTION_END);
1652         qemu_put_be32(f, se->section_id);
1653
1654         ret = se->ops->save_live_complete(f, se->opaque);
1655         trace_savevm_section_end(se->section_id);
1656         if (ret < 0) {
1657             return ret;
1658         }
1659     }
1660
1661     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1662         int len;
1663
1664         if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1665             continue;
1666         }
1667         trace_savevm_section_start();
1668         /* Section type */
1669         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1670         qemu_put_be32(f, se->section_id);
1671
1672         /* ID string */
1673         len = strlen(se->idstr);
1674         qemu_put_byte(f, len);
1675         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1676
1677         qemu_put_be32(f, se->instance_id);
1678         qemu_put_be32(f, se->version_id);
1679
1680         vmstate_save(f, se);
1681         trace_savevm_section_end(se->section_id);
1682     }
1683
1684     qemu_put_byte(f, QEMU_VM_EOF);
1685
1686     return qemu_file_get_error(f);
1687 }
1688
1689 void qemu_savevm_state_cancel(QEMUFile *f)
1690 {
1691     SaveStateEntry *se;
1692
1693     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1694         if (se->ops && se->ops->cancel) {
1695             se->ops->cancel(se->opaque);
1696         }
1697     }
1698 }
1699
1700 static int qemu_savevm_state(QEMUFile *f)
1701 {
1702     int ret;
1703     MigrationParams params = {
1704         .blk = 0,
1705         .shared = 0
1706     };
1707
1708     if (qemu_savevm_state_blocked(NULL)) {
1709         ret = -EINVAL;
1710         goto out;
1711     }
1712
1713     ret = qemu_savevm_state_begin(f, &params);
1714     if (ret < 0)
1715         goto out;
1716
1717     do {
1718         ret = qemu_savevm_state_iterate(f);
1719         if (ret < 0)
1720             goto out;
1721     } while (ret == 0);
1722
1723     ret = qemu_savevm_state_complete(f);
1724
1725 out:
1726     if (ret == 0) {
1727         ret = qemu_file_get_error(f);
1728     }
1729
1730     return ret;
1731 }
1732
1733 static int qemu_save_device_state(QEMUFile *f)
1734 {
1735     SaveStateEntry *se;
1736
1737     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
1738     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
1739
1740     cpu_synchronize_all_states();
1741
1742     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1743         int len;
1744
1745         if (se->is_ram) {
1746             continue;
1747         }
1748         if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
1749             continue;
1750         }
1751
1752         /* Section type */
1753         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
1754         qemu_put_be32(f, se->section_id);
1755
1756         /* ID string */
1757         len = strlen(se->idstr);
1758         qemu_put_byte(f, len);
1759         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
1760
1761         qemu_put_be32(f, se->instance_id);
1762         qemu_put_be32(f, se->version_id);
1763
1764         vmstate_save(f, se);
1765     }
1766
1767     qemu_put_byte(f, QEMU_VM_EOF);
1768
1769     return qemu_file_get_error(f);
1770 }
1771
1772 static SaveStateEntry *find_se(const char *idstr, int instance_id)
1773 {
1774     SaveStateEntry *se;
1775
1776     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1777         if (!strcmp(se->idstr, idstr) &&
1778             (instance_id == se->instance_id ||
1779              instance_id == se->alias_id))
1780             return se;
1781         /* Migrating from an older version? */
1782         if (strstr(se->idstr, idstr) && se->compat) {
1783             if (!strcmp(se->compat->idstr, idstr) &&
1784                 (instance_id == se->compat->instance_id ||
1785                  instance_id == se->alias_id))
1786                 return se;
1787         }
1788     }
1789     return NULL;
1790 }
1791
1792 static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
1793 {
1794     while(sub && sub->needed) {
1795         if (strcmp(idstr, sub->vmsd->name) == 0) {
1796             return sub->vmsd;
1797         }
1798         sub++;
1799     }
1800     return NULL;
1801 }
1802
1803 static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
1804                                    void *opaque)
1805 {
1806     while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
1807         char idstr[256];
1808         int ret;
1809         uint8_t version_id, len, size;
1810         const VMStateDescription *sub_vmsd;
1811
1812         len = qemu_peek_byte(f, 1);
1813         if (len < strlen(vmsd->name) + 1) {
1814             /* subsection name has be be "section_name/a" */
1815             return 0;
1816         }
1817         size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
1818         if (size != len) {
1819             return 0;
1820         }
1821         idstr[size] = 0;
1822
1823         if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
1824             /* it don't have a valid subsection name */
1825             return 0;
1826         }
1827         sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
1828         if (sub_vmsd == NULL) {
1829             return -ENOENT;
1830         }
1831         qemu_file_skip(f, 1); /* subsection */
1832         qemu_file_skip(f, 1); /* len */
1833         qemu_file_skip(f, len); /* idstr */
1834         version_id = qemu_get_be32(f);
1835
1836         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
1837         if (ret) {
1838             return ret;
1839         }
1840     }
1841     return 0;
1842 }
1843
1844 static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
1845                                     void *opaque)
1846 {
1847     const VMStateSubsection *sub = vmsd->subsections;
1848
1849     while (sub && sub->needed) {
1850         if (sub->needed(opaque)) {
1851             const VMStateDescription *vmsd = sub->vmsd;
1852             uint8_t len;
1853
1854             qemu_put_byte(f, QEMU_VM_SUBSECTION);
1855             len = strlen(vmsd->name);
1856             qemu_put_byte(f, len);
1857             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
1858             qemu_put_be32(f, vmsd->version_id);
1859             vmstate_save_state(f, vmsd, opaque);
1860         }
1861         sub++;
1862     }
1863 }
1864
1865 typedef struct LoadStateEntry {
1866     QLIST_ENTRY(LoadStateEntry) entry;
1867     SaveStateEntry *se;
1868     int section_id;
1869     int version_id;
1870 } LoadStateEntry;
1871
1872 int qemu_loadvm_state(QEMUFile *f)
1873 {
1874     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
1875         QLIST_HEAD_INITIALIZER(loadvm_handlers);
1876     LoadStateEntry *le, *new_le;
1877     uint8_t section_type;
1878     unsigned int v;
1879     int ret;
1880
1881     if (qemu_savevm_state_blocked(NULL)) {
1882         return -EINVAL;
1883     }
1884
1885     v = qemu_get_be32(f);
1886     if (v != QEMU_VM_FILE_MAGIC)
1887         return -EINVAL;
1888
1889     v = qemu_get_be32(f);
1890     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
1891         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
1892         return -ENOTSUP;
1893     }
1894     if (v != QEMU_VM_FILE_VERSION)
1895         return -ENOTSUP;
1896
1897     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
1898         uint32_t instance_id, version_id, section_id;
1899         SaveStateEntry *se;
1900         char idstr[257];
1901         int len;
1902
1903         switch (section_type) {
1904         case QEMU_VM_SECTION_START:
1905         case QEMU_VM_SECTION_FULL:
1906             /* Read section start */
1907             section_id = qemu_get_be32(f);
1908             len = qemu_get_byte(f);
1909             qemu_get_buffer(f, (uint8_t *)idstr, len);
1910             idstr[len] = 0;
1911             instance_id = qemu_get_be32(f);
1912             version_id = qemu_get_be32(f);
1913
1914             /* Find savevm section */
1915             se = find_se(idstr, instance_id);
1916             if (se == NULL) {
1917                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
1918                 ret = -EINVAL;
1919                 goto out;
1920             }
1921
1922             /* Validate version */
1923             if (version_id > se->version_id) {
1924                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
1925                         version_id, idstr, se->version_id);
1926                 ret = -EINVAL;
1927                 goto out;
1928             }
1929
1930             /* Add entry */
1931             le = g_malloc0(sizeof(*le));
1932
1933             le->se = se;
1934             le->section_id = section_id;
1935             le->version_id = version_id;
1936             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
1937
1938             ret = vmstate_load(f, le->se, le->version_id);
1939             if (ret < 0) {
1940                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
1941                         instance_id, idstr);
1942                 goto out;
1943             }
1944             break;
1945         case QEMU_VM_SECTION_PART:
1946         case QEMU_VM_SECTION_END:
1947             section_id = qemu_get_be32(f);
1948
1949             QLIST_FOREACH(le, &loadvm_handlers, entry) {
1950                 if (le->section_id == section_id) {
1951                     break;
1952                 }
1953             }
1954             if (le == NULL) {
1955                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
1956                 ret = -EINVAL;
1957                 goto out;
1958             }
1959
1960             ret = vmstate_load(f, le->se, le->version_id);
1961             if (ret < 0) {
1962                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
1963                         section_id);
1964                 goto out;
1965             }
1966             break;
1967         default:
1968             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
1969             ret = -EINVAL;
1970             goto out;
1971         }
1972     }
1973
1974     cpu_synchronize_all_post_init();
1975
1976     ret = 0;
1977
1978 out:
1979     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
1980         QLIST_REMOVE(le, entry);
1981         g_free(le);
1982     }
1983
1984     if (ret == 0) {
1985         ret = qemu_file_get_error(f);
1986     }
1987
1988     return ret;
1989 }
1990
1991 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
1992                               const char *name)
1993 {
1994     QEMUSnapshotInfo *sn_tab, *sn;
1995     int nb_sns, i, ret;
1996
1997     ret = -ENOENT;
1998     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1999     if (nb_sns < 0)
2000         return ret;
2001     for(i = 0; i < nb_sns; i++) {
2002         sn = &sn_tab[i];
2003         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
2004             *sn_info = *sn;
2005             ret = 0;
2006             break;
2007         }
2008     }
2009     g_free(sn_tab);
2010     return ret;
2011 }
2012
2013 /*
2014  * Deletes snapshots of a given name in all opened images.
2015  */
2016 static int del_existing_snapshots(Monitor *mon, const char *name)
2017 {
2018     BlockDriverState *bs;
2019     QEMUSnapshotInfo sn1, *snapshot = &sn1;
2020     int ret;
2021
2022     bs = NULL;
2023     while ((bs = bdrv_next(bs))) {
2024         if (bdrv_can_snapshot(bs) &&
2025             bdrv_snapshot_find(bs, snapshot, name) >= 0)
2026         {
2027             ret = bdrv_snapshot_delete(bs, name);
2028             if (ret < 0) {
2029                 monitor_printf(mon,
2030                                "Error while deleting snapshot on '%s'\n",
2031                                bdrv_get_device_name(bs));
2032                 return -1;
2033             }
2034         }
2035     }
2036
2037     return 0;
2038 }
2039
2040 void do_savevm(Monitor *mon, const QDict *qdict)
2041 {
2042     BlockDriverState *bs, *bs1;
2043     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
2044     int ret;
2045     QEMUFile *f;
2046     int saved_vm_running;
2047     uint64_t vm_state_size;
2048 #ifdef _WIN32
2049     struct _timeb tb;
2050     struct tm *ptm;
2051 #else
2052     struct timeval tv;
2053     struct tm tm;
2054 #endif
2055     const char *name = qdict_get_try_str(qdict, "name");
2056
2057     /* Verify if there is a device that doesn't support snapshots and is writable */
2058     bs = NULL;
2059     while ((bs = bdrv_next(bs))) {
2060
2061         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2062             continue;
2063         }
2064
2065         if (!bdrv_can_snapshot(bs)) {
2066             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
2067                                bdrv_get_device_name(bs));
2068             return;
2069         }
2070     }
2071
2072     bs = bdrv_snapshots();
2073     if (!bs) {
2074         monitor_printf(mon, "No block device can accept snapshots\n");
2075         return;
2076     }
2077
2078     saved_vm_running = runstate_is_running();
2079     vm_stop(RUN_STATE_SAVE_VM);
2080
2081     memset(sn, 0, sizeof(*sn));
2082
2083     /* fill auxiliary fields */
2084 #ifdef _WIN32
2085     _ftime(&tb);
2086     sn->date_sec = tb.time;
2087     sn->date_nsec = tb.millitm * 1000000;
2088 #else
2089     gettimeofday(&tv, NULL);
2090     sn->date_sec = tv.tv_sec;
2091     sn->date_nsec = tv.tv_usec * 1000;
2092 #endif
2093     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
2094
2095     if (name) {
2096         ret = bdrv_snapshot_find(bs, old_sn, name);
2097         if (ret >= 0) {
2098             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
2099             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
2100         } else {
2101             pstrcpy(sn->name, sizeof(sn->name), name);
2102         }
2103     } else {
2104 #ifdef _WIN32
2105         time_t t = tb.time;
2106         ptm = localtime(&t);
2107         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
2108 #else
2109         /* cast below needed for OpenBSD where tv_sec is still 'long' */
2110         localtime_r((const time_t *)&tv.tv_sec, &tm);
2111         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
2112 #endif
2113     }
2114
2115     /* Delete old snapshots of the same name */
2116     if (name && del_existing_snapshots(mon, name) < 0) {
2117         goto the_end;
2118     }
2119
2120     /* save the VM state */
2121     f = qemu_fopen_bdrv(bs, 1);
2122     if (!f) {
2123         monitor_printf(mon, "Could not open VM state file\n");
2124         goto the_end;
2125     }
2126     ret = qemu_savevm_state(f);
2127     vm_state_size = qemu_ftell(f);
2128     qemu_fclose(f);
2129     if (ret < 0) {
2130         monitor_printf(mon, "Error %d while writing VM\n", ret);
2131         goto the_end;
2132     }
2133
2134     /* create the snapshots */
2135
2136     bs1 = NULL;
2137     while ((bs1 = bdrv_next(bs1))) {
2138         if (bdrv_can_snapshot(bs1)) {
2139             /* Write VM state size only to the image that contains the state */
2140             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
2141             ret = bdrv_snapshot_create(bs1, sn);
2142             if (ret < 0) {
2143                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
2144                                bdrv_get_device_name(bs1));
2145             }
2146         }
2147     }
2148
2149  the_end:
2150     if (saved_vm_running)
2151         vm_start();
2152 }
2153
2154 void qmp_xen_save_devices_state(const char *filename, Error **errp)
2155 {
2156     QEMUFile *f;
2157     int saved_vm_running;
2158     int ret;
2159
2160     saved_vm_running = runstate_is_running();
2161     vm_stop(RUN_STATE_SAVE_VM);
2162
2163     f = qemu_fopen(filename, "wb");
2164     if (!f) {
2165         error_set(errp, QERR_OPEN_FILE_FAILED, filename);
2166         goto the_end;
2167     }
2168     ret = qemu_save_device_state(f);
2169     qemu_fclose(f);
2170     if (ret < 0) {
2171         error_set(errp, QERR_IO_ERROR);
2172     }
2173
2174  the_end:
2175     if (saved_vm_running)
2176         vm_start();
2177 }
2178
2179 int load_vmstate(const char *name)
2180 {
2181     BlockDriverState *bs, *bs_vm_state;
2182     QEMUSnapshotInfo sn;
2183     QEMUFile *f;
2184     int ret;
2185
2186     bs_vm_state = bdrv_snapshots();
2187     if (!bs_vm_state) {
2188         error_report("No block device supports snapshots");
2189         return -ENOTSUP;
2190     }
2191
2192     /* Don't even try to load empty VM states */
2193     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
2194     if (ret < 0) {
2195         return ret;
2196     } else if (sn.vm_state_size == 0) {
2197         error_report("This is a disk-only snapshot. Revert to it offline "
2198             "using qemu-img.");
2199         return -EINVAL;
2200     }
2201
2202     /* Verify if there is any device that doesn't support snapshots and is
2203     writable and check if the requested snapshot is available too. */
2204     bs = NULL;
2205     while ((bs = bdrv_next(bs))) {
2206
2207         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
2208             continue;
2209         }
2210
2211         if (!bdrv_can_snapshot(bs)) {
2212             error_report("Device '%s' is writable but does not support snapshots.",
2213                                bdrv_get_device_name(bs));
2214             return -ENOTSUP;
2215         }
2216
2217         ret = bdrv_snapshot_find(bs, &sn, name);
2218         if (ret < 0) {
2219             error_report("Device '%s' does not have the requested snapshot '%s'",
2220                            bdrv_get_device_name(bs), name);
2221             return ret;
2222         }
2223     }
2224
2225     /* Flush all IO requests so they don't interfere with the new state.  */
2226     bdrv_drain_all();
2227
2228     bs = NULL;
2229     while ((bs = bdrv_next(bs))) {
2230         if (bdrv_can_snapshot(bs)) {
2231             ret = bdrv_snapshot_goto(bs, name);
2232             if (ret < 0) {
2233                 error_report("Error %d while activating snapshot '%s' on '%s'",
2234                              ret, name, bdrv_get_device_name(bs));
2235                 return ret;
2236             }
2237         }
2238     }
2239
2240     /* restore the VM state */
2241     f = qemu_fopen_bdrv(bs_vm_state, 0);
2242     if (!f) {
2243         error_report("Could not open VM state file");
2244         return -EINVAL;
2245     }
2246
2247     qemu_system_reset(VMRESET_SILENT);
2248     ret = qemu_loadvm_state(f);
2249
2250     qemu_fclose(f);
2251     if (ret < 0) {
2252         error_report("Error %d while loading VM state", ret);
2253         return ret;
2254     }
2255
2256     return 0;
2257 }
2258
2259 void do_delvm(Monitor *mon, const QDict *qdict)
2260 {
2261     BlockDriverState *bs, *bs1;
2262     int ret;
2263     const char *name = qdict_get_str(qdict, "name");
2264
2265     bs = bdrv_snapshots();
2266     if (!bs) {
2267         monitor_printf(mon, "No block device supports snapshots\n");
2268         return;
2269     }
2270
2271     bs1 = NULL;
2272     while ((bs1 = bdrv_next(bs1))) {
2273         if (bdrv_can_snapshot(bs1)) {
2274             ret = bdrv_snapshot_delete(bs1, name);
2275             if (ret < 0) {
2276                 if (ret == -ENOTSUP)
2277                     monitor_printf(mon,
2278                                    "Snapshots not supported on device '%s'\n",
2279                                    bdrv_get_device_name(bs1));
2280                 else
2281                     monitor_printf(mon, "Error %d while deleting snapshot on "
2282                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
2283             }
2284         }
2285     }
2286 }
2287
2288 void do_info_snapshots(Monitor *mon)
2289 {
2290     BlockDriverState *bs, *bs1;
2291     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
2292     int nb_sns, i, ret, available;
2293     int total;
2294     int *available_snapshots;
2295     char buf[256];
2296
2297     bs = bdrv_snapshots();
2298     if (!bs) {
2299         monitor_printf(mon, "No available block device supports snapshots\n");
2300         return;
2301     }
2302
2303     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
2304     if (nb_sns < 0) {
2305         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
2306         return;
2307     }
2308
2309     if (nb_sns == 0) {
2310         monitor_printf(mon, "There is no snapshot available.\n");
2311         return;
2312     }
2313
2314     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
2315     total = 0;
2316     for (i = 0; i < nb_sns; i++) {
2317         sn = &sn_tab[i];
2318         available = 1;
2319         bs1 = NULL;
2320
2321         while ((bs1 = bdrv_next(bs1))) {
2322             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
2323                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
2324                 if (ret < 0) {
2325                     available = 0;
2326                     break;
2327                 }
2328             }
2329         }
2330
2331         if (available) {
2332             available_snapshots[total] = i;
2333             total++;
2334         }
2335     }
2336
2337     if (total > 0) {
2338         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
2339         for (i = 0; i < total; i++) {
2340             sn = &sn_tab[available_snapshots[i]];
2341             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
2342         }
2343     } else {
2344         monitor_printf(mon, "There is no suitable snapshot available\n");
2345     }
2346
2347     g_free(sn_tab);
2348     g_free(available_snapshots);
2349
2350 }
2351
2352 void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
2353 {
2354     qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
2355                        memory_region_name(mr), dev);
2356 }
2357
2358 void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
2359 {
2360     /* Nothing do to while the implementation is in RAMBlock */
2361 }
2362
2363 void vmstate_register_ram_global(MemoryRegion *mr)
2364 {
2365     vmstate_register_ram(mr, NULL);
2366 }
2367
2368 /*
2369   page = zrun nzrun
2370        | zrun nzrun page
2371
2372   zrun = length
2373
2374   nzrun = length byte...
2375
2376   length = uleb128 encoded integer
2377  */
2378 int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen,
2379                          uint8_t *dst, int dlen)
2380 {
2381     uint32_t zrun_len = 0, nzrun_len = 0;
2382     int d = 0, i = 0;
2383     long res, xor;
2384     uint8_t *nzrun_start = NULL;
2385
2386     g_assert(!(((uintptr_t)old_buf | (uintptr_t)new_buf | slen) %
2387                sizeof(long)));
2388
2389     while (i < slen) {
2390         /* overflow */
2391         if (d + 2 > dlen) {
2392             return -1;
2393         }
2394
2395         /* not aligned to sizeof(long) */
2396         res = (slen - i) % sizeof(long);
2397         while (res && old_buf[i] == new_buf[i]) {
2398             zrun_len++;
2399             i++;
2400             res--;
2401         }
2402
2403         /* word at a time for speed */
2404         if (!res) {
2405             while (i < slen &&
2406                    (*(long *)(old_buf + i)) == (*(long *)(new_buf + i))) {
2407                 i += sizeof(long);
2408                 zrun_len += sizeof(long);
2409             }
2410
2411             /* go over the rest */
2412             while (i < slen && old_buf[i] == new_buf[i]) {
2413                 zrun_len++;
2414                 i++;
2415             }
2416         }
2417
2418         /* buffer unchanged */
2419         if (zrun_len == slen) {
2420             return 0;
2421         }
2422
2423         /* skip last zero run */
2424         if (i == slen) {
2425             return d;
2426         }
2427
2428         d += uleb128_encode_small(dst + d, zrun_len);
2429
2430         zrun_len = 0;
2431         nzrun_start = new_buf + i;
2432
2433         /* overflow */
2434         if (d + 2 > dlen) {
2435             return -1;
2436         }
2437         /* not aligned to sizeof(long) */
2438         res = (slen - i) % sizeof(long);
2439         while (res && old_buf[i] != new_buf[i]) {
2440             i++;
2441             nzrun_len++;
2442             res--;
2443         }
2444
2445         /* word at a time for speed, use of 32-bit long okay */
2446         if (!res) {
2447             /* truncation to 32-bit long okay */
2448             long mask = (long)0x0101010101010101ULL;
2449             while (i < slen) {
2450                 xor = *(long *)(old_buf + i) ^ *(long *)(new_buf + i);
2451                 if ((xor - mask) & ~xor & (mask << 7)) {
2452                     /* found the end of an nzrun within the current long */
2453                     while (old_buf[i] != new_buf[i]) {
2454                         nzrun_len++;
2455                         i++;
2456                     }
2457                     break;
2458                 } else {
2459                     i += sizeof(long);
2460                     nzrun_len += sizeof(long);
2461                 }
2462             }
2463         }
2464
2465         d += uleb128_encode_small(dst + d, nzrun_len);
2466         /* overflow */
2467         if (d + nzrun_len > dlen) {
2468             return -1;
2469         }
2470         memcpy(dst + d, nzrun_start, nzrun_len);
2471         d += nzrun_len;
2472         nzrun_len = 0;
2473     }
2474
2475     return d;
2476 }
2477
2478 int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen)
2479 {
2480     int i = 0, d = 0;
2481     int ret;
2482     uint32_t count = 0;
2483
2484     while (i < slen) {
2485
2486         /* zrun */
2487         if ((slen - i) < 2) {
2488             return -1;
2489         }
2490
2491         ret = uleb128_decode_small(src + i, &count);
2492         if (ret < 0 || (i && !count)) {
2493             return -1;
2494         }
2495         i += ret;
2496         d += count;
2497
2498         /* overflow */
2499         if (d > dlen) {
2500             return -1;
2501         }
2502
2503         /* nzrun */
2504         if ((slen - i) < 2) {
2505             return -1;
2506         }
2507
2508         ret = uleb128_decode_small(src + i, &count);
2509         if (ret < 0 || !count) {
2510             return -1;
2511         }
2512         i += ret;
2513
2514         /* overflow */
2515         if (d + count > dlen || i + count > slen) {
2516             return -1;
2517         }
2518
2519         memcpy(dst + d, src + i, count);
2520         d += count;
2521         i += count;
2522     }
2523
2524     return d;
2525 }