savevm.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <time.h>
  28 #include <errno.h>
  29 #include <sys/time.h>
  30 #include <zlib.h>
  31
  32 /* Needed early for HOST_BSD etc. */
  33 #include "config-host.h"
  34
  35 #ifndef _WIN32
  36 #include <sys/times.h>
  37 #include <sys/wait.h>
  38 #include <termios.h>
  39 #include <sys/mman.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/resource.h>
  42 #include <sys/socket.h>
  43 #include <netinet/in.h>
  44 #include <net/if.h>
  45 #if defined(__NetBSD__)
  46 #include <net/if_tap.h>
  47 #endif
  48 #ifdef __linux__
  49 #include <linux/if_tun.h>
  50 #endif
  51 #include <arpa/inet.h>
  52 #include <dirent.h>
  53 #include <netdb.h>
  54 #include <sys/select.h>
  55 #ifdef HOST_BSD
  56 #include <sys/stat.h>
  57 #if defined(__FreeBSD__) || defined(__DragonFly__)
  58 #include <libutil.h>
  59 #else
  60 #include <util.h>
  61 #endif
  62 #elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
  63 #include <freebsd/stdlib.h>
  64 #else
  65 #ifdef __linux__
  66 #include <pty.h>
  67 #include <malloc.h>
  68 #include <linux/rtc.h>
  69 #endif
  70 #endif
  71 #endif
  72
  73 #ifdef _WIN32
  74 #include <windows.h>
  75 #include <malloc.h>
  76 #include <sys/timeb.h>
  77 #include <mmsystem.h>
  78 #define getopt_long_only getopt_long
  79 #define memalign(align, size) malloc(size)
  80 #endif
  81
  82 #include "qemu-common.h"
  83 #include "hw/hw.h"
  84 #include "net.h"
  85 #include "monitor.h"
  86 #include "sysemu.h"
  87 #include "qemu-timer.h"
  88 #include "qemu-char.h"
  89 #include "block.h"
  90 #include "audio/audio.h"
  91 #include "migration.h"
  92 #include "qemu_socket.h"
  93
  94 /* point to the block driver where the snapshots are managed */
  95 static BlockDriverState *bs_snapshots;
  96
  97 #define SELF_ANNOUNCE_ROUNDS 5
  98 #define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */
  99 //#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */
 100 #define EXPERIMENTAL_MAGIC 0xf1f23f4f
 101
 102 static int announce_self_create(uint8_t *buf,
 103                                 uint8_t *mac_addr)
 104 {
 105     uint32_t magic = EXPERIMENTAL_MAGIC;
 106     uint16_t proto = htons(ETH_P_EXPERIMENTAL);
 107
 108     /* FIXME: should we send a different packet (arp/rarp/ping)? */
 109
 110     memset(buf, 0xff, 6);         /* h_dst */
 111     memcpy(buf + 6, mac_addr, 6); /* h_src */
 112     memcpy(buf + 12, &proto, 2);  /* h_proto */
 113     memcpy(buf + 14, &magic, 4);  /* magic */
 114
 115     return 18; /* len */
 116 }
 117
 118 void qemu_announce_self(void)
 119 {
 120     int i, j, len;
 121     VLANState *vlan;
 122     VLANClientState *vc;
 123     uint8_t buf[256];
 124
 125     for (i = 0; i < MAX_NICS; i++) {
 126         if (!nd_table[i].used)
 127             continue;
 128         len = announce_self_create(buf, nd_table[i].macaddr);
 129         vlan = nd_table[i].vlan;
 130         for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
 131             for (j=0; j < SELF_ANNOUNCE_ROUNDS; j++)
 132                 vc->fd_read(vc->opaque, buf, len);
 133         }
 134     }
 135 }
 136
 137 /***********************************************************/
 138 /* savevm/loadvm support */
 139
 140 #define IO_BUF_SIZE 32768
 141
 142 struct QEMUFile {
 143     QEMUFilePutBufferFunc *put_buffer;
 144     QEMUFileGetBufferFunc *get_buffer;
 145     QEMUFileCloseFunc *close;
 146     QEMUFileRateLimit *rate_limit;
 147     void *opaque;
 148     int is_write;
 149
 150     int64_t buf_offset; /* start of buffer when writing, end of buffer
 151                            when reading */
 152     int buf_index;
 153     int buf_size; /* 0 when writing */
 154     uint8_t buf[IO_BUF_SIZE];
 155
 156     int has_error;
 157 };
 158
 159 typedef struct QEMUFilePopen
 160 {
 161     FILE *popen_file;
 162     QEMUFile *file;
 163 } QEMUFilePopen;
 164
 165 typedef struct QEMUFileSocket
 166 {
 167     int fd;
 168     QEMUFile *file;
 169 } QEMUFileSocket;
 170
 171 static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 172 {
 173     QEMUFileSocket *s = opaque;
 174     ssize_t len;
 175
 176     do {
 177         len = recv(s->fd, buf, size, 0);
 178     } while (len == -1 && socket_error() == EINTR);
 179
 180     if (len == -1)
 181         len = -socket_error();
 182
 183     return len;
 184 }
 185
 186 static int socket_close(void *opaque)
 187 {
 188     QEMUFileSocket *s = opaque;
 189     qemu_free(s);
 190     return 0;
 191 }
 192
 193 static int popen_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
 194 {
 195     QEMUFilePopen *s = opaque;
 196     return fwrite(buf, 1, size, s->popen_file);
 197 }
 198
 199 static int popen_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 200 {
 201     QEMUFilePopen *s = opaque;
 202     return fread(buf, 1, size, s->popen_file);
 203 }
 204
 205 static int popen_close(void *opaque)
 206 {
 207     QEMUFilePopen *s = opaque;
 208     pclose(s->popen_file);
 209     qemu_free(s);
 210     return 0;
 211 }
 212
 213 QEMUFile *qemu_popen(FILE *popen_file, const char *mode)
 214 {
 215     QEMUFilePopen *s;
 216
 217     if (popen_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
 218         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
 219         return NULL;
 220     }
 221
 222     s = qemu_mallocz(sizeof(QEMUFilePopen));
 223
 224     s->popen_file = popen_file;
 225
 226     if(mode[0] == 'r') {
 227         s->file = qemu_fopen_ops(s, NULL, popen_get_buffer, popen_close, NULL);
 228     } else {
 229         s->file = qemu_fopen_ops(s, popen_put_buffer, NULL, popen_close, NULL);
 230     }
 231     fprintf(stderr, "qemu_popen: returning result of qemu_fopen_ops\n");
 232     return s->file;
 233 }
 234
 235 QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
 236 {
 237     FILE *popen_file;
 238
 239     popen_file = popen(command, mode);
 240     if(popen_file == NULL) {
 241         return NULL;
 242     }
 243
 244     return qemu_popen(popen_file, mode);
 245 }
 246
 247 QEMUFile *qemu_fopen_socket(int fd)
 248 {
 249     QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));
 250
 251     s->fd = fd;
 252     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, NULL);
 253     return s->file;
 254 }
 255
 256 typedef struct QEMUFileStdio
 257 {
 258     FILE *outfile;
 259 } QEMUFileStdio;
 260
 261 static int file_put_buffer(void *opaque, const uint8_t *buf,
 262                             int64_t pos, int size)
 263 {
 264     QEMUFileStdio *s = opaque;
 265     fseek(s->outfile, pos, SEEK_SET);
 266     fwrite(buf, 1, size, s->outfile);
 267     return size;
 268 }
 269
 270 static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 271 {
 272     QEMUFileStdio *s = opaque;
 273     fseek(s->outfile, pos, SEEK_SET);
 274     return fread(buf, 1, size, s->outfile);
 275 }
 276
 277 static int file_close(void *opaque)
 278 {
 279     QEMUFileStdio *s = opaque;
 280     fclose(s->outfile);
 281     qemu_free(s);
 282     return 0;
 283 }
 284
 285 QEMUFile *qemu_fopen(const char *filename, const char *mode)
 286 {
 287     QEMUFileStdio *s;
 288
 289     s = qemu_mallocz(sizeof(QEMUFileStdio));
 290
 291     s->outfile = fopen(filename, mode);
 292     if (!s->outfile)
 293         goto fail;
 294
 295     if (!strcmp(mode, "wb"))
 296         return qemu_fopen_ops(s, file_put_buffer, NULL, file_close, NULL);
 297     else if (!strcmp(mode, "rb"))
 298         return qemu_fopen_ops(s, NULL, file_get_buffer, file_close, NULL);
 299
 300 fail:
 301     if (s->outfile)
 302         fclose(s->outfile);
 303     qemu_free(s);
 304     return NULL;
 305 }
 306
 307 typedef struct QEMUFileBdrv
 308 {
 309     BlockDriverState *bs;
 310     int64_t base_offset;
 311 } QEMUFileBdrv;
 312
 313 static int bdrv_put_buffer(void *opaque, const uint8_t *buf,
 314                            int64_t pos, int size)
 315 {
 316     QEMUFileBdrv *s = opaque;
 317     bdrv_pwrite(s->bs, s->base_offset + pos, buf, size);
 318     return size;
 319 }
 320
 321 static int bdrv_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
 322 {
 323     QEMUFileBdrv *s = opaque;
 324     return bdrv_pread(s->bs, s->base_offset + pos, buf, size);
 325 }
 326
 327 static int bdrv_fclose(void *opaque)
 328 {
 329     QEMUFileBdrv *s = opaque;
 330     qemu_free(s);
 331     return 0;
 332 }
 333
 334 static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int64_t offset, int is_writable)
 335 {
 336     QEMUFileBdrv *s;
 337
 338     s = qemu_mallocz(sizeof(QEMUFileBdrv));
 339
 340     s->bs = bs;
 341     s->base_offset = offset;
 342
 343     if (is_writable)
 344         return qemu_fopen_ops(s, bdrv_put_buffer, NULL, bdrv_fclose, NULL);
 345
 346     return qemu_fopen_ops(s, NULL, bdrv_get_buffer, bdrv_fclose, NULL);
 347 }
 348
 349 QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
 350                          QEMUFileGetBufferFunc *get_buffer,
 351                          QEMUFileCloseFunc *close,
 352                          QEMUFileRateLimit *rate_limit)
 353 {
 354     QEMUFile *f;
 355
 356     f = qemu_mallocz(sizeof(QEMUFile));
 357
 358     f->opaque = opaque;
 359     f->put_buffer = put_buffer;
 360     f->get_buffer = get_buffer;
 361     f->close = close;
 362     f->rate_limit = rate_limit;
 363     f->is_write = 0;
 364
 365     return f;
 366 }
 367
 368 int qemu_file_has_error(QEMUFile *f)
 369 {
 370     return f->has_error;
 371 }
 372
 373 void qemu_fflush(QEMUFile *f)
 374 {
 375     if (!f->put_buffer)
 376         return;
 377
 378     if (f->is_write && f->buf_index > 0) {
 379         int len;
 380
 381         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
 382         if (len > 0)
 383             f->buf_offset += f->buf_index;
 384         else
 385             f->has_error = 1;
 386         f->buf_index = 0;
 387     }
 388 }
 389
 390 static void qemu_fill_buffer(QEMUFile *f)
 391 {
 392     int len;
 393
 394     if (!f->get_buffer)
 395         return;
 396
 397     if (f->is_write)
 398         abort();
 399
 400     len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
 401     if (len > 0) {
 402         f->buf_index = 0;
 403         f->buf_size = len;
 404         f->buf_offset += len;
 405     } else if (len != -EAGAIN)
 406         f->has_error = 1;
 407 }
 408
 409 int qemu_fclose(QEMUFile *f)
 410 {
 411     int ret = 0;
 412     qemu_fflush(f);
 413     if (f->close)
 414         ret = f->close(f->opaque);
 415     qemu_free(f);
 416     return ret;
 417 }
 418
 419 void qemu_file_put_notify(QEMUFile *f)
 420 {
 421     f->put_buffer(f->opaque, NULL, 0, 0);
 422 }
 423
 424 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
 425 {
 426     int l;
 427
 428     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 429         fprintf(stderr,
 430                 "Attempted to write to buffer while read buffer is not empty\n");
 431         abort();
 432     }
 433
 434     while (!f->has_error && size > 0) {
 435         l = IO_BUF_SIZE - f->buf_index;
 436         if (l > size)
 437             l = size;
 438         memcpy(f->buf + f->buf_index, buf, l);
 439         f->is_write = 1;
 440         f->buf_index += l;
 441         buf += l;
 442         size -= l;
 443         if (f->buf_index >= IO_BUF_SIZE)
 444             qemu_fflush(f);
 445     }
 446 }
 447
 448 void qemu_put_byte(QEMUFile *f, int v)
 449 {
 450     if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
 451         fprintf(stderr,
 452                 "Attempted to write to buffer while read buffer is not empty\n");
 453         abort();
 454     }
 455
 456     f->buf[f->buf_index++] = v;
 457     f->is_write = 1;
 458     if (f->buf_index >= IO_BUF_SIZE)
 459         qemu_fflush(f);
 460 }
 461
 462 int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
 463 {
 464     int size, l;
 465
 466     if (f->is_write)
 467         abort();
 468
 469     size = size1;
 470     while (size > 0) {
 471         l = f->buf_size - f->buf_index;
 472         if (l == 0) {
 473             qemu_fill_buffer(f);
 474             l = f->buf_size - f->buf_index;
 475             if (l == 0)
 476                 break;
 477         }
 478         if (l > size)
 479             l = size;
 480         memcpy(buf, f->buf + f->buf_index, l);
 481         f->buf_index += l;
 482         buf += l;
 483         size -= l;
 484     }
 485     return size1 - size;
 486 }
 487
 488 int qemu_get_byte(QEMUFile *f)
 489 {
 490     if (f->is_write)
 491         abort();
 492
 493     if (f->buf_index >= f->buf_size) {
 494         qemu_fill_buffer(f);
 495         if (f->buf_index >= f->buf_size)
 496             return 0;
 497     }
 498     return f->buf[f->buf_index++];
 499 }
 500
 501 int64_t qemu_ftell(QEMUFile *f)
 502 {
 503     return f->buf_offset - f->buf_size + f->buf_index;
 504 }
 505
 506 int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
 507 {
 508     if (whence == SEEK_SET) {
 509         /* nothing to do */
 510     } else if (whence == SEEK_CUR) {
 511         pos += qemu_ftell(f);
 512     } else {
 513         /* SEEK_END not supported */
 514         return -1;
 515     }
 516     if (f->put_buffer) {
 517         qemu_fflush(f);
 518         f->buf_offset = pos;
 519     } else {
 520         f->buf_offset = pos;
 521         f->buf_index = 0;
 522         f->buf_size = 0;
 523     }
 524     return pos;
 525 }
 526
 527 int qemu_file_rate_limit(QEMUFile *f)
 528 {
 529     if (f->rate_limit)
 530         return f->rate_limit(f->opaque);
 531
 532     return 0;
 533 }
 534
 535 void qemu_put_be16(QEMUFile *f, unsigned int v)
 536 {
 537     qemu_put_byte(f, v >> 8);
 538     qemu_put_byte(f, v);
 539 }
 540
 541 void qemu_put_be32(QEMUFile *f, unsigned int v)
 542 {
 543     qemu_put_byte(f, v >> 24);
 544     qemu_put_byte(f, v >> 16);
 545     qemu_put_byte(f, v >> 8);
 546     qemu_put_byte(f, v);
 547 }
 548
 549 void qemu_put_be64(QEMUFile *f, uint64_t v)
 550 {
 551     qemu_put_be32(f, v >> 32);
 552     qemu_put_be32(f, v);
 553 }
 554
 555 unsigned int qemu_get_be16(QEMUFile *f)
 556 {
 557     unsigned int v;
 558     v = qemu_get_byte(f) << 8;
 559     v |= qemu_get_byte(f);
 560     return v;
 561 }
 562
 563 unsigned int qemu_get_be32(QEMUFile *f)
 564 {
 565     unsigned int v;
 566     v = qemu_get_byte(f) << 24;
 567     v |= qemu_get_byte(f) << 16;
 568     v |= qemu_get_byte(f) << 8;
 569     v |= qemu_get_byte(f);
 570     return v;
 571 }
 572
 573 uint64_t qemu_get_be64(QEMUFile *f)
 574 {
 575     uint64_t v;
 576     v = (uint64_t)qemu_get_be32(f) << 32;
 577     v |= qemu_get_be32(f);
 578     return v;
 579 }
 580
 581 typedef struct SaveStateEntry {
 582     char idstr[256];
 583     int instance_id;
 584     int version_id;
 585     int section_id;
 586     SaveLiveStateHandler *save_live_state;
 587     SaveStateHandler *save_state;
 588     LoadStateHandler *load_state;
 589     void *opaque;
 590     struct SaveStateEntry *next;
 591 } SaveStateEntry;
 592
 593 static SaveStateEntry *first_se;
 594
 595 /* TODO: Individual devices generally have very little idea about the rest
 596    of the system, so instance_id should be removed/replaced.
 597    Meanwhile pass -1 as instance_id if you do not already have a clearly
 598    distinguishing id for all instances of your device class. */
 599 int register_savevm_live(const char *idstr,
 600                          int instance_id,
 601                          int version_id,
 602                          SaveLiveStateHandler *save_live_state,
 603                          SaveStateHandler *save_state,
 604                          LoadStateHandler *load_state,
 605                          void *opaque)
 606 {
 607     SaveStateEntry *se, **pse;
 608     static int global_section_id;
 609
 610     se = qemu_malloc(sizeof(SaveStateEntry));
 611     pstrcpy(se->idstr, sizeof(se->idstr), idstr);
 612     se->instance_id = (instance_id == -1) ? 0 : instance_id;
 613     se->version_id = version_id;
 614     se->section_id = global_section_id++;
 615     se->save_live_state = save_live_state;
 616     se->save_state = save_state;
 617     se->load_state = load_state;
 618     se->opaque = opaque;
 619     se->next = NULL;
 620
 621     /* add at the end of list */
 622     pse = &first_se;
 623     while (*pse != NULL) {
 624         if (instance_id == -1
 625                 && strcmp(se->idstr, (*pse)->idstr) == 0
 626                 && se->instance_id <= (*pse)->instance_id)
 627             se->instance_id = (*pse)->instance_id + 1;
 628         pse = &(*pse)->next;
 629     }
 630     *pse = se;
 631     return 0;
 632 }
 633
 634 int register_savevm(const char *idstr,
 635                     int instance_id,
 636                     int version_id,
 637                     SaveStateHandler *save_state,
 638                     LoadStateHandler *load_state,
 639                     void *opaque)
 640 {
 641     return register_savevm_live(idstr, instance_id, version_id,
 642                                 NULL, save_state, load_state, opaque);
 643 }
 644
 645 #define QEMU_VM_FILE_MAGIC           0x5145564d
 646 #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
 647 #define QEMU_VM_FILE_VERSION         0x00000003
 648
 649 #define QEMU_VM_EOF                  0x00
 650 #define QEMU_VM_SECTION_START        0x01
 651 #define QEMU_VM_SECTION_PART         0x02
 652 #define QEMU_VM_SECTION_END          0x03
 653 #define QEMU_VM_SECTION_FULL         0x04
 654
 655 int qemu_savevm_state_begin(QEMUFile *f)
 656 {
 657     SaveStateEntry *se;
 658
 659     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
 660     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
 661
 662     for (se = first_se; se != NULL; se = se->next) {
 663         int len;
 664
 665         if (se->save_live_state == NULL)
 666             continue;
 667
 668         /* Section type */
 669         qemu_put_byte(f, QEMU_VM_SECTION_START);
 670         qemu_put_be32(f, se->section_id);
 671
 672         /* ID string */
 673         len = strlen(se->idstr);
 674         qemu_put_byte(f, len);
 675         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
 676
 677         qemu_put_be32(f, se->instance_id);
 678         qemu_put_be32(f, se->version_id);
 679
 680         se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
 681     }
 682
 683     if (qemu_file_has_error(f))
 684         return -EIO;
 685
 686     return 0;
 687 }
 688
 689 int qemu_savevm_state_iterate(QEMUFile *f)
 690 {
 691     SaveStateEntry *se;
 692     int ret = 1;
 693
 694     for (se = first_se; se != NULL; se = se->next) {
 695         if (se->save_live_state == NULL)
 696             continue;
 697
 698         /* Section type */
 699         qemu_put_byte(f, QEMU_VM_SECTION_PART);
 700         qemu_put_be32(f, se->section_id);
 701
 702         ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
 703     }
 704
 705     if (ret)
 706         return 1;
 707
 708     if (qemu_file_has_error(f))
 709         return -EIO;
 710
 711     return 0;
 712 }
 713
 714 int qemu_savevm_state_complete(QEMUFile *f)
 715 {
 716     SaveStateEntry *se;
 717
 718     for (se = first_se; se != NULL; se = se->next) {
 719         if (se->save_live_state == NULL)
 720             continue;
 721
 722         /* Section type */
 723         qemu_put_byte(f, QEMU_VM_SECTION_END);
 724         qemu_put_be32(f, se->section_id);
 725
 726         se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
 727     }
 728
 729     for(se = first_se; se != NULL; se = se->next) {
 730         int len;
 731
 732         if (se->save_state == NULL)
 733             continue;
 734
 735         /* Section type */
 736         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
 737         qemu_put_be32(f, se->section_id);
 738
 739         /* ID string */
 740         len = strlen(se->idstr);
 741         qemu_put_byte(f, len);
 742         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
 743
 744         qemu_put_be32(f, se->instance_id);
 745         qemu_put_be32(f, se->version_id);
 746
 747         se->save_state(f, se->opaque);
 748     }
 749
 750     qemu_put_byte(f, QEMU_VM_EOF);
 751
 752     if (qemu_file_has_error(f))
 753         return -EIO;
 754
 755     return 0;
 756 }
 757
 758 int qemu_savevm_state(QEMUFile *f)
 759 {
 760     int saved_vm_running;
 761     int ret;
 762
 763     saved_vm_running = vm_running;
 764     vm_stop(0);
 765
 766     bdrv_flush_all();
 767
 768     ret = qemu_savevm_state_begin(f);
 769     if (ret < 0)
 770         goto out;
 771
 772     do {
 773         ret = qemu_savevm_state_iterate(f);
 774         if (ret < 0)
 775             goto out;
 776     } while (ret == 0);
 777
 778     ret = qemu_savevm_state_complete(f);
 779
 780 out:
 781     if (qemu_file_has_error(f))
 782         ret = -EIO;
 783
 784     if (!ret && saved_vm_running)
 785         vm_start();
 786
 787     return ret;
 788 }
 789
 790 static SaveStateEntry *find_se(const char *idstr, int instance_id)
 791 {
 792     SaveStateEntry *se;
 793
 794     for(se = first_se; se != NULL; se = se->next) {
 795         if (!strcmp(se->idstr, idstr) &&
 796             instance_id == se->instance_id)
 797             return se;
 798     }
 799     return NULL;
 800 }
 801
 802 typedef struct LoadStateEntry {
 803     SaveStateEntry *se;
 804     int section_id;
 805     int version_id;
 806     struct LoadStateEntry *next;
 807 } LoadStateEntry;
 808
 809 static int qemu_loadvm_state_v2(QEMUFile *f)
 810 {
 811     SaveStateEntry *se;
 812     int len, ret, instance_id, record_len, version_id;
 813     int64_t total_len, end_pos, cur_pos;
 814     char idstr[256];
 815
 816     total_len = qemu_get_be64(f);
 817     end_pos = total_len + qemu_ftell(f);
 818     for(;;) {
 819         if (qemu_ftell(f) >= end_pos)
 820             break;
 821         len = qemu_get_byte(f);
 822         qemu_get_buffer(f, (uint8_t *)idstr, len);
 823         idstr[len] = '\0';
 824         instance_id = qemu_get_be32(f);
 825         version_id = qemu_get_be32(f);
 826         record_len = qemu_get_be32(f);
 827         cur_pos = qemu_ftell(f);
 828         se = find_se(idstr, instance_id);
 829         if (!se) {
 830             fprintf(stderr, "qemu: warning: instance 0x%x of device '%s' not present in current VM\n",
 831                     instance_id, idstr);
 832         } else {
 833             ret = se->load_state(f, se->opaque, version_id);
 834             if (ret < 0) {
 835                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
 836                         instance_id, idstr);
 837                 return ret;
 838             }
 839         }
 840         /* always seek to exact end of record */
 841         qemu_fseek(f, cur_pos + record_len, SEEK_SET);
 842     }
 843
 844     if (qemu_file_has_error(f))
 845         return -EIO;
 846
 847     return 0;
 848 }
 849
 850 int qemu_loadvm_state(QEMUFile *f)
 851 {
 852     LoadStateEntry *first_le = NULL;
 853     uint8_t section_type;
 854     unsigned int v;
 855     int ret;
 856
 857     v = qemu_get_be32(f);
 858     if (v != QEMU_VM_FILE_MAGIC)
 859         return -EINVAL;
 860
 861     v = qemu_get_be32(f);
 862     if (v == QEMU_VM_FILE_VERSION_COMPAT)
 863         return qemu_loadvm_state_v2(f);
 864     if (v != QEMU_VM_FILE_VERSION)
 865         return -ENOTSUP;
 866
 867     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
 868         uint32_t instance_id, version_id, section_id;
 869         LoadStateEntry *le;
 870         SaveStateEntry *se;
 871         char idstr[257];
 872         int len;
 873
 874         switch (section_type) {
 875         case QEMU_VM_SECTION_START:
 876         case QEMU_VM_SECTION_FULL:
 877             /* Read section start */
 878             section_id = qemu_get_be32(f);
 879             len = qemu_get_byte(f);
 880             qemu_get_buffer(f, (uint8_t *)idstr, len);
 881             idstr[len] = 0;
 882             instance_id = qemu_get_be32(f);
 883             version_id = qemu_get_be32(f);
 884
 885             /* Find savevm section */
 886             se = find_se(idstr, instance_id);
 887             if (se == NULL) {
 888                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
 889                 ret = -EINVAL;
 890                 goto out;
 891             }
 892
 893             /* Validate version */
 894             if (version_id > se->version_id) {
 895                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
 896                         version_id, idstr, se->version_id);
 897                 ret = -EINVAL;
 898                 goto out;
 899             }
 900
 901             /* Add entry */
 902             le = qemu_mallocz(sizeof(*le));
 903
 904             le->se = se;
 905             le->section_id = section_id;
 906             le->version_id = version_id;
 907             le->next = first_le;
 908             first_le = le;
 909
 910             le->se->load_state(f, le->se->opaque, le->version_id);
 911             break;
 912         case QEMU_VM_SECTION_PART:
 913         case QEMU_VM_SECTION_END:
 914             section_id = qemu_get_be32(f);
 915
 916             for (le = first_le; le && le->section_id != section_id; le = le->next);
 917             if (le == NULL) {
 918                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
 919                 ret = -EINVAL;
 920                 goto out;
 921             }
 922
 923             le->se->load_state(f, le->se->opaque, le->version_id);
 924             break;
 925         default:
 926             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
 927             ret = -EINVAL;
 928             goto out;
 929         }
 930     }
 931
 932     ret = 0;
 933
 934 out:
 935     while (first_le) {
 936         LoadStateEntry *le = first_le;
 937         first_le = first_le->next;
 938         qemu_free(le);
 939     }
 940
 941     if (qemu_file_has_error(f))
 942         ret = -EIO;
 943
 944     return ret;
 945 }
 946
 947 /* device can contain snapshots */
 948 static int bdrv_can_snapshot(BlockDriverState *bs)
 949 {
 950     return (bs &&
 951             !bdrv_is_removable(bs) &&
 952             !bdrv_is_read_only(bs));
 953 }
 954
 955 /* device must be snapshots in order to have a reliable snapshot */
 956 static int bdrv_has_snapshot(BlockDriverState *bs)
 957 {
 958     return (bs &&
 959             !bdrv_is_removable(bs) &&
 960             !bdrv_is_read_only(bs));
 961 }
 962
 963 static BlockDriverState *get_bs_snapshots(void)
 964 {
 965     BlockDriverState *bs;
 966     int i;
 967
 968     if (bs_snapshots)
 969         return bs_snapshots;
 970     for(i = 0; i <= nb_drives; i++) {
 971         bs = drives_table[i].bdrv;
 972         if (bdrv_can_snapshot(bs))
 973             goto ok;
 974     }
 975     return NULL;
 976  ok:
 977     bs_snapshots = bs;
 978     return bs;
 979 }
 980
 981 static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
 982                               const char *name)
 983 {
 984     QEMUSnapshotInfo *sn_tab, *sn;
 985     int nb_sns, i, ret;
 986
 987     ret = -ENOENT;
 988     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
 989     if (nb_sns < 0)
 990         return ret;
 991     for(i = 0; i < nb_sns; i++) {
 992         sn = &sn_tab[i];
 993         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
 994             *sn_info = *sn;
 995             ret = 0;
 996             break;
 997         }
 998     }
 999     qemu_free(sn_tab);
1000     return ret;
1001 }
1002
1003 void do_savevm(Monitor *mon, const char *name)
1004 {
1005     BlockDriverState *bs, *bs1;
1006     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1007     int must_delete, ret, i;
1008     BlockDriverInfo bdi1, *bdi = &bdi1;
1009     QEMUFile *f;
1010     int saved_vm_running;
1011     uint32_t vm_state_size;
1012 #ifdef _WIN32
1013     struct _timeb tb;
1014 #else
1015     struct timeval tv;
1016 #endif
1017
1018     bs = get_bs_snapshots();
1019     if (!bs) {
1020         monitor_printf(mon, "No block device can accept snapshots\n");
1021         return;
1022     }
1023
1024     /* ??? Should this occur after vm_stop?  */
1025     qemu_aio_flush();
1026
1027     saved_vm_running = vm_running;
1028     vm_stop(0);
1029
1030     must_delete = 0;
1031     if (name) {
1032         ret = bdrv_snapshot_find(bs, old_sn, name);
1033         if (ret >= 0) {
1034             must_delete = 1;
1035         }
1036     }
1037     memset(sn, 0, sizeof(*sn));
1038     if (must_delete) {
1039         pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
1040         pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
1041     } else {
1042         if (name)
1043             pstrcpy(sn->name, sizeof(sn->name), name);
1044     }
1045
1046     /* fill auxiliary fields */
1047 #ifdef _WIN32
1048     _ftime(&tb);
1049     sn->date_sec = tb.time;
1050     sn->date_nsec = tb.millitm * 1000000;
1051 #else
1052     gettimeofday(&tv, NULL);
1053     sn->date_sec = tv.tv_sec;
1054     sn->date_nsec = tv.tv_usec * 1000;
1055 #endif
1056     sn->vm_clock_nsec = qemu_get_clock(vm_clock);
1057
1058     if (bdrv_get_info(bs, bdi) < 0 || bdi->vm_state_offset <= 0) {
1059         monitor_printf(mon, "Device %s does not support VM state snapshots\n",
1060                        bdrv_get_device_name(bs));
1061         goto the_end;
1062     }
1063
1064     /* save the VM state */
1065     f = qemu_fopen_bdrv(bs, bdi->vm_state_offset, 1);
1066     if (!f) {
1067         monitor_printf(mon, "Could not open VM state file\n");
1068         goto the_end;
1069     }
1070     ret = qemu_savevm_state(f);
1071     vm_state_size = qemu_ftell(f);
1072     qemu_fclose(f);
1073     if (ret < 0) {
1074         monitor_printf(mon, "Error %d while writing VM\n", ret);
1075         goto the_end;
1076     }
1077
1078     /* create the snapshots */
1079
1080     for(i = 0; i < nb_drives; i++) {
1081         bs1 = drives_table[i].bdrv;
1082         if (bdrv_has_snapshot(bs1)) {
1083             if (must_delete) {
1084                 ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
1085                 if (ret < 0) {
1086                     monitor_printf(mon,
1087                                    "Error while deleting snapshot on '%s'\n",
1088                                    bdrv_get_device_name(bs1));
1089                 }
1090             }
1091             /* Write VM state size only to the image that contains the state */
1092             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
1093             ret = bdrv_snapshot_create(bs1, sn);
1094             if (ret < 0) {
1095                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
1096                                bdrv_get_device_name(bs1));
1097             }
1098         }
1099     }
1100
1101  the_end:
1102     if (saved_vm_running)
1103         vm_start();
1104 }
1105
1106 void do_loadvm(Monitor *mon, const char *name)
1107 {
1108     BlockDriverState *bs, *bs1;
1109     BlockDriverInfo bdi1, *bdi = &bdi1;
1110     QEMUSnapshotInfo sn;
1111     QEMUFile *f;
1112     int i, ret;
1113     int saved_vm_running;
1114
1115     bs = get_bs_snapshots();
1116     if (!bs) {
1117         monitor_printf(mon, "No block device supports snapshots\n");
1118         return;
1119     }
1120
1121     /* Flush all IO requests so they don't interfere with the new state.  */
1122     qemu_aio_flush();
1123
1124     saved_vm_running = vm_running;
1125     vm_stop(0);
1126
1127     for(i = 0; i <= nb_drives; i++) {
1128         bs1 = drives_table[i].bdrv;
1129         if (bdrv_has_snapshot(bs1)) {
1130             ret = bdrv_snapshot_goto(bs1, name);
1131             if (ret < 0) {
1132                 if (bs != bs1)
1133                     monitor_printf(mon, "Warning: ");
1134                 switch(ret) {
1135                 case -ENOTSUP:
1136                     monitor_printf(mon,
1137                                    "Snapshots not supported on device '%s'\n",
1138                                    bdrv_get_device_name(bs1));
1139                     break;
1140                 case -ENOENT:
1141                     monitor_printf(mon, "Could not find snapshot '%s' on "
1142                                    "device '%s'\n",
1143                                    name, bdrv_get_device_name(bs1));
1144                     break;
1145                 default:
1146                     monitor_printf(mon, "Error %d while activating snapshot on"
1147                                    " '%s'\n", ret, bdrv_get_device_name(bs1));
1148                     break;
1149                 }
1150                 /* fatal on snapshot block device */
1151                 if (bs == bs1)
1152                     goto the_end;
1153             }
1154         }
1155     }
1156
1157     if (bdrv_get_info(bs, bdi) < 0 || bdi->vm_state_offset <= 0) {
1158         monitor_printf(mon, "Device %s does not support VM state snapshots\n",
1159                        bdrv_get_device_name(bs));
1160         return;
1161     }
1162
1163     /* Don't even try to load empty VM states */
1164     ret = bdrv_snapshot_find(bs, &sn, name);
1165     if ((ret >= 0) && (sn.vm_state_size == 0))
1166         goto the_end;
1167
1168     /* restore the VM state */
1169     f = qemu_fopen_bdrv(bs, bdi->vm_state_offset, 0);
1170     if (!f) {
1171         monitor_printf(mon, "Could not open VM state file\n");
1172         goto the_end;
1173     }
1174     ret = qemu_loadvm_state(f);
1175     qemu_fclose(f);
1176     if (ret < 0) {
1177         monitor_printf(mon, "Error %d while loading VM state\n", ret);
1178     }
1179  the_end:
1180     if (saved_vm_running)
1181         vm_start();
1182 }
1183
1184 void do_delvm(Monitor *mon, const char *name)
1185 {
1186     BlockDriverState *bs, *bs1;
1187     int i, ret;
1188
1189     bs = get_bs_snapshots();
1190     if (!bs) {
1191         monitor_printf(mon, "No block device supports snapshots\n");
1192         return;
1193     }
1194
1195     for(i = 0; i <= nb_drives; i++) {
1196         bs1 = drives_table[i].bdrv;
1197         if (bdrv_has_snapshot(bs1)) {
1198             ret = bdrv_snapshot_delete(bs1, name);
1199             if (ret < 0) {
1200                 if (ret == -ENOTSUP)
1201                     monitor_printf(mon,
1202                                    "Snapshots not supported on device '%s'\n",
1203                                    bdrv_get_device_name(bs1));
1204                 else
1205                     monitor_printf(mon, "Error %d while deleting snapshot on "
1206                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
1207             }
1208         }
1209     }
1210 }
1211
1212 void do_info_snapshots(Monitor *mon)
1213 {
1214     BlockDriverState *bs, *bs1;
1215     QEMUSnapshotInfo *sn_tab, *sn;
1216     int nb_sns, i;
1217     char buf[256];
1218
1219     bs = get_bs_snapshots();
1220     if (!bs) {
1221         monitor_printf(mon, "No available block device supports snapshots\n");
1222         return;
1223     }
1224     monitor_printf(mon, "Snapshot devices:");
1225     for(i = 0; i <= nb_drives; i++) {
1226         bs1 = drives_table[i].bdrv;
1227         if (bdrv_has_snapshot(bs1)) {
1228             if (bs == bs1)
1229                 monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
1230         }
1231     }
1232     monitor_printf(mon, "\n");
1233
1234     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
1235     if (nb_sns < 0) {
1236         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
1237         return;
1238     }
1239     monitor_printf(mon, "Snapshot list (from %s):\n",
1240                    bdrv_get_device_name(bs));
1241     monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
1242     for(i = 0; i < nb_sns; i++) {
1243         sn = &sn_tab[i];
1244         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
1245     }
1246     qemu_free(sn_tab);
1247 }