File:  [Qemu by Fabrice Bellard] / qemu / savevm.c
Revision 1.1.1.11 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 19:17:03 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu1001, HEAD
qemu 1.0.1

    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: 
   87: #define SELF_ANNOUNCE_ROUNDS 5
   88: 
   89: #ifndef ETH_P_RARP
   90: #define ETH_P_RARP 0x8035
   91: #endif
   92: #define ARP_HTYPE_ETH 0x0001
   93: #define ARP_PTYPE_IP 0x0800
   94: #define ARP_OP_REQUEST_REV 0x3
   95: 
   96: static int announce_self_create(uint8_t *buf,
   97: 				uint8_t *mac_addr)
   98: {
   99:     /* Ethernet header. */
  100:     memset(buf, 0xff, 6);         /* destination MAC addr */
  101:     memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
  102:     *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
  103: 
  104:     /* RARP header. */
  105:     *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
  106:     *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
  107:     *(buf + 18) = 6; /* hardware addr length (ethernet) */
  108:     *(buf + 19) = 4; /* protocol addr length (IPv4) */
  109:     *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
  110:     memcpy(buf + 22, mac_addr, 6); /* source hw addr */
  111:     memset(buf + 28, 0x00, 4);     /* source protocol addr */
  112:     memcpy(buf + 32, mac_addr, 6); /* target hw addr */
  113:     memset(buf + 38, 0x00, 4);     /* target protocol addr */
  114: 
  115:     /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
  116:     memset(buf + 42, 0x00, 18);
  117: 
  118:     return 60; /* len (FCS will be added by hardware) */
  119: }
  120: 
  121: static void qemu_announce_self_iter(NICState *nic, void *opaque)
  122: {
  123:     uint8_t buf[60];
  124:     int len;
  125: 
  126:     len = announce_self_create(buf, nic->conf->macaddr.a);
  127: 
  128:     qemu_send_packet_raw(&nic->nc, buf, len);
  129: }
  130: 
  131: 
  132: static void qemu_announce_self_once(void *opaque)
  133: {
  134:     static int count = SELF_ANNOUNCE_ROUNDS;
  135:     QEMUTimer *timer = *(QEMUTimer **)opaque;
  136: 
  137:     qemu_foreach_nic(qemu_announce_self_iter, NULL);
  138: 
  139:     if (--count) {
  140:         /* delay 50ms, 150ms, 250ms, ... */
  141:         qemu_mod_timer(timer, qemu_get_clock_ms(rt_clock) +
  142:                        50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
  143:     } else {
  144: 	    qemu_del_timer(timer);
  145: 	    qemu_free_timer(timer);
  146:     }
  147: }
  148: 
  149: void qemu_announce_self(void)
  150: {
  151: 	static QEMUTimer *timer;
  152: 	timer = qemu_new_timer_ms(rt_clock, qemu_announce_self_once, &timer);
  153: 	qemu_announce_self_once(&timer);
  154: }
  155: 
  156: /***********************************************************/
  157: /* savevm/loadvm support */
  158: 
  159: #define IO_BUF_SIZE 32768
  160: 
  161: struct QEMUFile {
  162:     QEMUFilePutBufferFunc *put_buffer;
  163:     QEMUFileGetBufferFunc *get_buffer;
  164:     QEMUFileCloseFunc *close;
  165:     QEMUFileRateLimit *rate_limit;
  166:     QEMUFileSetRateLimit *set_rate_limit;
  167:     QEMUFileGetRateLimit *get_rate_limit;
  168:     void *opaque;
  169:     int is_write;
  170: 
  171:     int64_t buf_offset; /* start of buffer when writing, end of buffer
  172:                            when reading */
  173:     int buf_index;
  174:     int buf_size; /* 0 when writing */
  175:     uint8_t buf[IO_BUF_SIZE];
  176: 
  177:     int last_error;
  178: };
  179: 
  180: typedef struct QEMUFileStdio
  181: {
  182:     FILE *stdio_file;
  183:     QEMUFile *file;
  184: } QEMUFileStdio;
  185: 
  186: typedef struct QEMUFileSocket
  187: {
  188:     int fd;
  189:     QEMUFile *file;
  190: } QEMUFileSocket;
  191: 
  192: static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
  193: {
  194:     QEMUFileSocket *s = opaque;
  195:     ssize_t len;
  196: 
  197:     do {
  198:         len = qemu_recv(s->fd, buf, size, 0);
  199:     } while (len == -1 && socket_error() == EINTR);
  200: 
  201:     if (len == -1)
  202:         len = -socket_error();
  203: 
  204:     return len;
  205: }
  206: 
  207: static int socket_close(void *opaque)
  208: {
  209:     QEMUFileSocket *s = opaque;
  210:     g_free(s);
  211:     return 0;
  212: }
  213: 
  214: static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
  215: {
  216:     QEMUFileStdio *s = opaque;
  217:     return fwrite(buf, 1, size, s->stdio_file);
  218: }
  219: 
  220: static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
  221: {
  222:     QEMUFileStdio *s = opaque;
  223:     FILE *fp = s->stdio_file;
  224:     int bytes;
  225: 
  226:     do {
  227:         clearerr(fp);
  228:         bytes = fread(buf, 1, size, fp);
  229:     } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
  230:     return bytes;
  231: }
  232: 
  233: static int stdio_pclose(void *opaque)
  234: {
  235:     QEMUFileStdio *s = opaque;
  236:     int ret;
  237:     ret = pclose(s->stdio_file);
  238:     g_free(s);
  239:     return ret;
  240: }
  241: 
  242: static int stdio_fclose(void *opaque)
  243: {
  244:     QEMUFileStdio *s = opaque;
  245:     fclose(s->stdio_file);
  246:     g_free(s);
  247:     return 0;
  248: }
  249: 
  250: QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
  251: {
  252:     QEMUFileStdio *s;
  253: 
  254:     if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
  255:         fprintf(stderr, "qemu_popen: Argument validity check failed\n");
  256:         return NULL;
  257:     }
  258: 
  259:     s = g_malloc0(sizeof(QEMUFileStdio));
  260: 
  261:     s->stdio_file = stdio_file;
  262: 
  263:     if(mode[0] == 'r') {
  264:         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, 
  265: 				 NULL, NULL, NULL);
  266:     } else {
  267:         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, 
  268: 				 NULL, NULL, NULL);
  269:     }
  270:     return s->file;
  271: }
  272: 
  273: QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
  274: {
  275:     FILE *popen_file;
  276: 
  277:     popen_file = popen(command, mode);
  278:     if(popen_file == NULL) {
  279:         return NULL;
  280:     }
  281: 
  282:     return qemu_popen(popen_file, mode);
  283: }
  284: 
  285: int qemu_stdio_fd(QEMUFile *f)
  286: {
  287:     QEMUFileStdio *p;
  288:     int fd;
  289: 
  290:     p = (QEMUFileStdio *)f->opaque;
  291:     fd = fileno(p->stdio_file);
  292: 
  293:     return fd;
  294: }
  295: 
  296: QEMUFile *qemu_fdopen(int fd, const char *mode)
  297: {
  298:     QEMUFileStdio *s;
  299: 
  300:     if (mode == NULL ||
  301: 	(mode[0] != 'r' && mode[0] != 'w') ||
  302: 	mode[1] != 'b' || mode[2] != 0) {
  303:         fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
  304:         return NULL;
  305:     }
  306: 
  307:     s = g_malloc0(sizeof(QEMUFileStdio));
  308:     s->stdio_file = fdopen(fd, mode);
  309:     if (!s->stdio_file)
  310:         goto fail;
  311: 
  312:     if(mode[0] == 'r') {
  313:         s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose, 
  314: 				 NULL, NULL, NULL);
  315:     } else {
  316:         s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, 
  317: 				 NULL, NULL, NULL);
  318:     }
  319:     return s->file;
  320: 
  321: fail:
  322:     g_free(s);
  323:     return NULL;
  324: }
  325: 
  326: QEMUFile *qemu_fopen_socket(int fd)
  327: {
  328:     QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
  329: 
  330:     s->fd = fd;
  331:     s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, 
  332: 			     NULL, NULL, NULL);
  333:     return s->file;
  334: }
  335: 
  336: static int file_put_buffer(void *opaque, const uint8_t *buf,
  337:                             int64_t pos, int size)
  338: {
  339:     QEMUFileStdio *s = opaque;
  340:     fseek(s->stdio_file, pos, SEEK_SET);
  341:     return fwrite(buf, 1, size, s->stdio_file);
  342: }
  343: 
  344: static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
  345: {
  346:     QEMUFileStdio *s = opaque;
  347:     fseek(s->stdio_file, pos, SEEK_SET);
  348:     return fread(buf, 1, size, s->stdio_file);
  349: }
  350: 
  351: QEMUFile *qemu_fopen(const char *filename, const char *mode)
  352: {
  353:     QEMUFileStdio *s;
  354: 
  355:     if (mode == NULL ||
  356: 	(mode[0] != 'r' && mode[0] != 'w') ||
  357: 	mode[1] != 'b' || mode[2] != 0) {
  358:         fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
  359:         return NULL;
  360:     }
  361: 
  362:     s = g_malloc0(sizeof(QEMUFileStdio));
  363: 
  364:     s->stdio_file = fopen(filename, mode);
  365:     if (!s->stdio_file)
  366:         goto fail;
  367:     
  368:     if(mode[0] == 'w') {
  369:         s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose, 
  370: 				 NULL, NULL, NULL);
  371:     } else {
  372:         s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, 
  373: 			       NULL, NULL, NULL);
  374:     }
  375:     return s->file;
  376: fail:
  377:     g_free(s);
  378:     return NULL;
  379: }
  380: 
  381: static int block_put_buffer(void *opaque, const uint8_t *buf,
  382:                            int64_t pos, int size)
  383: {
  384:     bdrv_save_vmstate(opaque, buf, pos, size);
  385:     return size;
  386: }
  387: 
  388: static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
  389: {
  390:     return bdrv_load_vmstate(opaque, buf, pos, size);
  391: }
  392: 
  393: static int bdrv_fclose(void *opaque)
  394: {
  395:     return 0;
  396: }
  397: 
  398: static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
  399: {
  400:     if (is_writable)
  401:         return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, 
  402: 			      NULL, NULL, NULL);
  403:     return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
  404: }
  405: 
  406: QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
  407:                          QEMUFileGetBufferFunc *get_buffer,
  408:                          QEMUFileCloseFunc *close,
  409:                          QEMUFileRateLimit *rate_limit,
  410:                          QEMUFileSetRateLimit *set_rate_limit,
  411:                          QEMUFileGetRateLimit *get_rate_limit)
  412: {
  413:     QEMUFile *f;
  414: 
  415:     f = g_malloc0(sizeof(QEMUFile));
  416: 
  417:     f->opaque = opaque;
  418:     f->put_buffer = put_buffer;
  419:     f->get_buffer = get_buffer;
  420:     f->close = close;
  421:     f->rate_limit = rate_limit;
  422:     f->set_rate_limit = set_rate_limit;
  423:     f->get_rate_limit = get_rate_limit;
  424:     f->is_write = 0;
  425: 
  426:     return f;
  427: }
  428: 
  429: int qemu_file_get_error(QEMUFile *f)
  430: {
  431:     return f->last_error;
  432: }
  433: 
  434: void qemu_file_set_error(QEMUFile *f, int ret)
  435: {
  436:     f->last_error = ret;
  437: }
  438: 
  439: void qemu_fflush(QEMUFile *f)
  440: {
  441:     if (!f->put_buffer)
  442:         return;
  443: 
  444:     if (f->is_write && f->buf_index > 0) {
  445:         int len;
  446: 
  447:         len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
  448:         if (len > 0)
  449:             f->buf_offset += f->buf_index;
  450:         else
  451:             f->last_error = -EINVAL;
  452:         f->buf_index = 0;
  453:     }
  454: }
  455: 
  456: static void qemu_fill_buffer(QEMUFile *f)
  457: {
  458:     int len;
  459:     int pending;
  460: 
  461:     if (!f->get_buffer)
  462:         return;
  463: 
  464:     if (f->is_write)
  465:         abort();
  466: 
  467:     pending = f->buf_size - f->buf_index;
  468:     if (pending > 0) {
  469:         memmove(f->buf, f->buf + f->buf_index, pending);
  470:     }
  471:     f->buf_index = 0;
  472:     f->buf_size = pending;
  473: 
  474:     len = f->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
  475:                         IO_BUF_SIZE - pending);
  476:     if (len > 0) {
  477:         f->buf_size += len;
  478:         f->buf_offset += len;
  479:     } else if (len == 0) {
  480:         f->last_error = -EIO;
  481:     } else if (len != -EAGAIN)
  482:         f->last_error = len;
  483: }
  484: 
  485: int qemu_fclose(QEMUFile *f)
  486: {
  487:     int ret = 0;
  488:     qemu_fflush(f);
  489:     if (f->close)
  490:         ret = f->close(f->opaque);
  491:     g_free(f);
  492:     return ret;
  493: }
  494: 
  495: void qemu_file_put_notify(QEMUFile *f)
  496: {
  497:     f->put_buffer(f->opaque, NULL, 0, 0);
  498: }
  499: 
  500: void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
  501: {
  502:     int l;
  503: 
  504:     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
  505:         fprintf(stderr,
  506:                 "Attempted to write to buffer while read buffer is not empty\n");
  507:         abort();
  508:     }
  509: 
  510:     while (!f->last_error && size > 0) {
  511:         l = IO_BUF_SIZE - f->buf_index;
  512:         if (l > size)
  513:             l = size;
  514:         memcpy(f->buf + f->buf_index, buf, l);
  515:         f->is_write = 1;
  516:         f->buf_index += l;
  517:         buf += l;
  518:         size -= l;
  519:         if (f->buf_index >= IO_BUF_SIZE)
  520:             qemu_fflush(f);
  521:     }
  522: }
  523: 
  524: void qemu_put_byte(QEMUFile *f, int v)
  525: {
  526:     if (!f->last_error && f->is_write == 0 && f->buf_index > 0) {
  527:         fprintf(stderr,
  528:                 "Attempted to write to buffer while read buffer is not empty\n");
  529:         abort();
  530:     }
  531: 
  532:     f->buf[f->buf_index++] = v;
  533:     f->is_write = 1;
  534:     if (f->buf_index >= IO_BUF_SIZE)
  535:         qemu_fflush(f);
  536: }
  537: 
  538: static void qemu_file_skip(QEMUFile *f, int size)
  539: {
  540:     if (f->buf_index + size <= f->buf_size) {
  541:         f->buf_index += size;
  542:     }
  543: }
  544: 
  545: static int qemu_peek_buffer(QEMUFile *f, uint8_t *buf, int size, size_t offset)
  546: {
  547:     int pending;
  548:     int index;
  549: 
  550:     if (f->is_write) {
  551:         abort();
  552:     }
  553: 
  554:     index = f->buf_index + offset;
  555:     pending = f->buf_size - index;
  556:     if (pending < size) {
  557:         qemu_fill_buffer(f);
  558:         index = f->buf_index + offset;
  559:         pending = f->buf_size - index;
  560:     }
  561: 
  562:     if (pending <= 0) {
  563:         return 0;
  564:     }
  565:     if (size > pending) {
  566:         size = pending;
  567:     }
  568: 
  569:     memcpy(buf, f->buf + index, size);
  570:     return size;
  571: }
  572: 
  573: int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size)
  574: {
  575:     int pending = size;
  576:     int done = 0;
  577: 
  578:     while (pending > 0) {
  579:         int res;
  580: 
  581:         res = qemu_peek_buffer(f, buf, pending, 0);
  582:         if (res == 0) {
  583:             return done;
  584:         }
  585:         qemu_file_skip(f, res);
  586:         buf += res;
  587:         pending -= res;
  588:         done += res;
  589:     }
  590:     return done;
  591: }
  592: 
  593: static int qemu_peek_byte(QEMUFile *f, int offset)
  594: {
  595:     int index = f->buf_index + offset;
  596: 
  597:     if (f->is_write) {
  598:         abort();
  599:     }
  600: 
  601:     if (index >= f->buf_size) {
  602:         qemu_fill_buffer(f);
  603:         index = f->buf_index + offset;
  604:         if (index >= f->buf_size) {
  605:             return 0;
  606:         }
  607:     }
  608:     return f->buf[index];
  609: }
  610: 
  611: int qemu_get_byte(QEMUFile *f)
  612: {
  613:     int result;
  614: 
  615:     result = qemu_peek_byte(f, 0);
  616:     qemu_file_skip(f, 1);
  617:     return result;
  618: }
  619: 
  620: int64_t qemu_ftell(QEMUFile *f)
  621: {
  622:     return f->buf_offset - f->buf_size + f->buf_index;
  623: }
  624: 
  625: int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
  626: {
  627:     if (whence == SEEK_SET) {
  628:         /* nothing to do */
  629:     } else if (whence == SEEK_CUR) {
  630:         pos += qemu_ftell(f);
  631:     } else {
  632:         /* SEEK_END not supported */
  633:         return -1;
  634:     }
  635:     if (f->put_buffer) {
  636:         qemu_fflush(f);
  637:         f->buf_offset = pos;
  638:     } else {
  639:         f->buf_offset = pos;
  640:         f->buf_index = 0;
  641:         f->buf_size = 0;
  642:     }
  643:     return pos;
  644: }
  645: 
  646: int qemu_file_rate_limit(QEMUFile *f)
  647: {
  648:     if (f->rate_limit)
  649:         return f->rate_limit(f->opaque);
  650: 
  651:     return 0;
  652: }
  653: 
  654: int64_t qemu_file_get_rate_limit(QEMUFile *f)
  655: {
  656:     if (f->get_rate_limit)
  657:         return f->get_rate_limit(f->opaque);
  658: 
  659:     return 0;
  660: }
  661: 
  662: int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
  663: {
  664:     /* any failed or completed migration keeps its state to allow probing of
  665:      * migration data, but has no associated file anymore */
  666:     if (f && f->set_rate_limit)
  667:         return f->set_rate_limit(f->opaque, new_rate);
  668: 
  669:     return 0;
  670: }
  671: 
  672: void qemu_put_be16(QEMUFile *f, unsigned int v)
  673: {
  674:     qemu_put_byte(f, v >> 8);
  675:     qemu_put_byte(f, v);
  676: }
  677: 
  678: void qemu_put_be32(QEMUFile *f, unsigned int v)
  679: {
  680:     qemu_put_byte(f, v >> 24);
  681:     qemu_put_byte(f, v >> 16);
  682:     qemu_put_byte(f, v >> 8);
  683:     qemu_put_byte(f, v);
  684: }
  685: 
  686: void qemu_put_be64(QEMUFile *f, uint64_t v)
  687: {
  688:     qemu_put_be32(f, v >> 32);
  689:     qemu_put_be32(f, v);
  690: }
  691: 
  692: unsigned int qemu_get_be16(QEMUFile *f)
  693: {
  694:     unsigned int v;
  695:     v = qemu_get_byte(f) << 8;
  696:     v |= qemu_get_byte(f);
  697:     return v;
  698: }
  699: 
  700: unsigned int qemu_get_be32(QEMUFile *f)
  701: {
  702:     unsigned int v;
  703:     v = qemu_get_byte(f) << 24;
  704:     v |= qemu_get_byte(f) << 16;
  705:     v |= qemu_get_byte(f) << 8;
  706:     v |= qemu_get_byte(f);
  707:     return v;
  708: }
  709: 
  710: uint64_t qemu_get_be64(QEMUFile *f)
  711: {
  712:     uint64_t v;
  713:     v = (uint64_t)qemu_get_be32(f) << 32;
  714:     v |= qemu_get_be32(f);
  715:     return v;
  716: }
  717: 
  718: 
  719: /* timer */
  720: 
  721: void qemu_put_timer(QEMUFile *f, QEMUTimer *ts)
  722: {
  723:     uint64_t expire_time;
  724: 
  725:     expire_time = qemu_timer_expire_time_ns(ts);
  726:     qemu_put_be64(f, expire_time);
  727: }
  728: 
  729: void qemu_get_timer(QEMUFile *f, QEMUTimer *ts)
  730: {
  731:     uint64_t expire_time;
  732: 
  733:     expire_time = qemu_get_be64(f);
  734:     if (expire_time != -1) {
  735:         qemu_mod_timer_ns(ts, expire_time);
  736:     } else {
  737:         qemu_del_timer(ts);
  738:     }
  739: }
  740: 
  741: 
  742: /* bool */
  743: 
  744: static int get_bool(QEMUFile *f, void *pv, size_t size)
  745: {
  746:     bool *v = pv;
  747:     *v = qemu_get_byte(f);
  748:     return 0;
  749: }
  750: 
  751: static void put_bool(QEMUFile *f, void *pv, size_t size)
  752: {
  753:     bool *v = pv;
  754:     qemu_put_byte(f, *v);
  755: }
  756: 
  757: const VMStateInfo vmstate_info_bool = {
  758:     .name = "bool",
  759:     .get  = get_bool,
  760:     .put  = put_bool,
  761: };
  762: 
  763: /* 8 bit int */
  764: 
  765: static int get_int8(QEMUFile *f, void *pv, size_t size)
  766: {
  767:     int8_t *v = pv;
  768:     qemu_get_s8s(f, v);
  769:     return 0;
  770: }
  771: 
  772: static void put_int8(QEMUFile *f, void *pv, size_t size)
  773: {
  774:     int8_t *v = pv;
  775:     qemu_put_s8s(f, v);
  776: }
  777: 
  778: const VMStateInfo vmstate_info_int8 = {
  779:     .name = "int8",
  780:     .get  = get_int8,
  781:     .put  = put_int8,
  782: };
  783: 
  784: /* 16 bit int */
  785: 
  786: static int get_int16(QEMUFile *f, void *pv, size_t size)
  787: {
  788:     int16_t *v = pv;
  789:     qemu_get_sbe16s(f, v);
  790:     return 0;
  791: }
  792: 
  793: static void put_int16(QEMUFile *f, void *pv, size_t size)
  794: {
  795:     int16_t *v = pv;
  796:     qemu_put_sbe16s(f, v);
  797: }
  798: 
  799: const VMStateInfo vmstate_info_int16 = {
  800:     .name = "int16",
  801:     .get  = get_int16,
  802:     .put  = put_int16,
  803: };
  804: 
  805: /* 32 bit int */
  806: 
  807: static int get_int32(QEMUFile *f, void *pv, size_t size)
  808: {
  809:     int32_t *v = pv;
  810:     qemu_get_sbe32s(f, v);
  811:     return 0;
  812: }
  813: 
  814: static void put_int32(QEMUFile *f, void *pv, size_t size)
  815: {
  816:     int32_t *v = pv;
  817:     qemu_put_sbe32s(f, v);
  818: }
  819: 
  820: const VMStateInfo vmstate_info_int32 = {
  821:     .name = "int32",
  822:     .get  = get_int32,
  823:     .put  = put_int32,
  824: };
  825: 
  826: /* 32 bit int. See that the received value is the same than the one
  827:    in the field */
  828: 
  829: static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
  830: {
  831:     int32_t *v = pv;
  832:     int32_t v2;
  833:     qemu_get_sbe32s(f, &v2);
  834: 
  835:     if (*v == v2)
  836:         return 0;
  837:     return -EINVAL;
  838: }
  839: 
  840: const VMStateInfo vmstate_info_int32_equal = {
  841:     .name = "int32 equal",
  842:     .get  = get_int32_equal,
  843:     .put  = put_int32,
  844: };
  845: 
  846: /* 32 bit int. See that the received value is the less or the same
  847:    than the one in the field */
  848: 
  849: static int get_int32_le(QEMUFile *f, void *pv, size_t size)
  850: {
  851:     int32_t *old = pv;
  852:     int32_t new;
  853:     qemu_get_sbe32s(f, &new);
  854: 
  855:     if (*old <= new)
  856:         return 0;
  857:     return -EINVAL;
  858: }
  859: 
  860: const VMStateInfo vmstate_info_int32_le = {
  861:     .name = "int32 equal",
  862:     .get  = get_int32_le,
  863:     .put  = put_int32,
  864: };
  865: 
  866: /* 64 bit int */
  867: 
  868: static int get_int64(QEMUFile *f, void *pv, size_t size)
  869: {
  870:     int64_t *v = pv;
  871:     qemu_get_sbe64s(f, v);
  872:     return 0;
  873: }
  874: 
  875: static void put_int64(QEMUFile *f, void *pv, size_t size)
  876: {
  877:     int64_t *v = pv;
  878:     qemu_put_sbe64s(f, v);
  879: }
  880: 
  881: const VMStateInfo vmstate_info_int64 = {
  882:     .name = "int64",
  883:     .get  = get_int64,
  884:     .put  = put_int64,
  885: };
  886: 
  887: /* 8 bit unsigned int */
  888: 
  889: static int get_uint8(QEMUFile *f, void *pv, size_t size)
  890: {
  891:     uint8_t *v = pv;
  892:     qemu_get_8s(f, v);
  893:     return 0;
  894: }
  895: 
  896: static void put_uint8(QEMUFile *f, void *pv, size_t size)
  897: {
  898:     uint8_t *v = pv;
  899:     qemu_put_8s(f, v);
  900: }
  901: 
  902: const VMStateInfo vmstate_info_uint8 = {
  903:     .name = "uint8",
  904:     .get  = get_uint8,
  905:     .put  = put_uint8,
  906: };
  907: 
  908: /* 16 bit unsigned int */
  909: 
  910: static int get_uint16(QEMUFile *f, void *pv, size_t size)
  911: {
  912:     uint16_t *v = pv;
  913:     qemu_get_be16s(f, v);
  914:     return 0;
  915: }
  916: 
  917: static void put_uint16(QEMUFile *f, void *pv, size_t size)
  918: {
  919:     uint16_t *v = pv;
  920:     qemu_put_be16s(f, v);
  921: }
  922: 
  923: const VMStateInfo vmstate_info_uint16 = {
  924:     .name = "uint16",
  925:     .get  = get_uint16,
  926:     .put  = put_uint16,
  927: };
  928: 
  929: /* 32 bit unsigned int */
  930: 
  931: static int get_uint32(QEMUFile *f, void *pv, size_t size)
  932: {
  933:     uint32_t *v = pv;
  934:     qemu_get_be32s(f, v);
  935:     return 0;
  936: }
  937: 
  938: static void put_uint32(QEMUFile *f, void *pv, size_t size)
  939: {
  940:     uint32_t *v = pv;
  941:     qemu_put_be32s(f, v);
  942: }
  943: 
  944: const VMStateInfo vmstate_info_uint32 = {
  945:     .name = "uint32",
  946:     .get  = get_uint32,
  947:     .put  = put_uint32,
  948: };
  949: 
  950: /* 32 bit uint. See that the received value is the same than the one
  951:    in the field */
  952: 
  953: static int get_uint32_equal(QEMUFile *f, void *pv, size_t size)
  954: {
  955:     uint32_t *v = pv;
  956:     uint32_t v2;
  957:     qemu_get_be32s(f, &v2);
  958: 
  959:     if (*v == v2) {
  960:         return 0;
  961:     }
  962:     return -EINVAL;
  963: }
  964: 
  965: const VMStateInfo vmstate_info_uint32_equal = {
  966:     .name = "uint32 equal",
  967:     .get  = get_uint32_equal,
  968:     .put  = put_uint32,
  969: };
  970: 
  971: /* 64 bit unsigned int */
  972: 
  973: static int get_uint64(QEMUFile *f, void *pv, size_t size)
  974: {
  975:     uint64_t *v = pv;
  976:     qemu_get_be64s(f, v);
  977:     return 0;
  978: }
  979: 
  980: static void put_uint64(QEMUFile *f, void *pv, size_t size)
  981: {
  982:     uint64_t *v = pv;
  983:     qemu_put_be64s(f, v);
  984: }
  985: 
  986: const VMStateInfo vmstate_info_uint64 = {
  987:     .name = "uint64",
  988:     .get  = get_uint64,
  989:     .put  = put_uint64,
  990: };
  991: 
  992: /* 8 bit int. See that the received value is the same than the one
  993:    in the field */
  994: 
  995: static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
  996: {
  997:     uint8_t *v = pv;
  998:     uint8_t v2;
  999:     qemu_get_8s(f, &v2);
 1000: 
 1001:     if (*v == v2)
 1002:         return 0;
 1003:     return -EINVAL;
 1004: }
 1005: 
 1006: const VMStateInfo vmstate_info_uint8_equal = {
 1007:     .name = "uint8 equal",
 1008:     .get  = get_uint8_equal,
 1009:     .put  = put_uint8,
 1010: };
 1011: 
 1012: /* 16 bit unsigned int int. See that the received value is the same than the one
 1013:    in the field */
 1014: 
 1015: static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
 1016: {
 1017:     uint16_t *v = pv;
 1018:     uint16_t v2;
 1019:     qemu_get_be16s(f, &v2);
 1020: 
 1021:     if (*v == v2)
 1022:         return 0;
 1023:     return -EINVAL;
 1024: }
 1025: 
 1026: const VMStateInfo vmstate_info_uint16_equal = {
 1027:     .name = "uint16 equal",
 1028:     .get  = get_uint16_equal,
 1029:     .put  = put_uint16,
 1030: };
 1031: 
 1032: /* timers  */
 1033: 
 1034: static int get_timer(QEMUFile *f, void *pv, size_t size)
 1035: {
 1036:     QEMUTimer *v = pv;
 1037:     qemu_get_timer(f, v);
 1038:     return 0;
 1039: }
 1040: 
 1041: static void put_timer(QEMUFile *f, void *pv, size_t size)
 1042: {
 1043:     QEMUTimer *v = pv;
 1044:     qemu_put_timer(f, v);
 1045: }
 1046: 
 1047: const VMStateInfo vmstate_info_timer = {
 1048:     .name = "timer",
 1049:     .get  = get_timer,
 1050:     .put  = put_timer,
 1051: };
 1052: 
 1053: /* uint8_t buffers */
 1054: 
 1055: static int get_buffer(QEMUFile *f, void *pv, size_t size)
 1056: {
 1057:     uint8_t *v = pv;
 1058:     qemu_get_buffer(f, v, size);
 1059:     return 0;
 1060: }
 1061: 
 1062: static void put_buffer(QEMUFile *f, void *pv, size_t size)
 1063: {
 1064:     uint8_t *v = pv;
 1065:     qemu_put_buffer(f, v, size);
 1066: }
 1067: 
 1068: const VMStateInfo vmstate_info_buffer = {
 1069:     .name = "buffer",
 1070:     .get  = get_buffer,
 1071:     .put  = put_buffer,
 1072: };
 1073: 
 1074: /* unused buffers: space that was used for some fields that are
 1075:    not useful anymore */
 1076: 
 1077: static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
 1078: {
 1079:     uint8_t buf[1024];
 1080:     int block_len;
 1081: 
 1082:     while (size > 0) {
 1083:         block_len = MIN(sizeof(buf), size);
 1084:         size -= block_len;
 1085:         qemu_get_buffer(f, buf, block_len);
 1086:     }
 1087:    return 0;
 1088: }
 1089: 
 1090: static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
 1091: {
 1092:     static const uint8_t buf[1024];
 1093:     int block_len;
 1094: 
 1095:     while (size > 0) {
 1096:         block_len = MIN(sizeof(buf), size);
 1097:         size -= block_len;
 1098:         qemu_put_buffer(f, buf, block_len);
 1099:     }
 1100: }
 1101: 
 1102: const VMStateInfo vmstate_info_unused_buffer = {
 1103:     .name = "unused_buffer",
 1104:     .get  = get_unused_buffer,
 1105:     .put  = put_unused_buffer,
 1106: };
 1107: 
 1108: typedef struct CompatEntry {
 1109:     char idstr[256];
 1110:     int instance_id;
 1111: } CompatEntry;
 1112: 
 1113: typedef struct SaveStateEntry {
 1114:     QTAILQ_ENTRY(SaveStateEntry) entry;
 1115:     char idstr[256];
 1116:     int instance_id;
 1117:     int alias_id;
 1118:     int version_id;
 1119:     int section_id;
 1120:     SaveSetParamsHandler *set_params;
 1121:     SaveLiveStateHandler *save_live_state;
 1122:     SaveStateHandler *save_state;
 1123:     LoadStateHandler *load_state;
 1124:     const VMStateDescription *vmsd;
 1125:     void *opaque;
 1126:     CompatEntry *compat;
 1127:     int no_migrate;
 1128: } SaveStateEntry;
 1129: 
 1130: 
 1131: static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
 1132:     QTAILQ_HEAD_INITIALIZER(savevm_handlers);
 1133: static int global_section_id;
 1134: 
 1135: static int calculate_new_instance_id(const char *idstr)
 1136: {
 1137:     SaveStateEntry *se;
 1138:     int instance_id = 0;
 1139: 
 1140:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1141:         if (strcmp(idstr, se->idstr) == 0
 1142:             && instance_id <= se->instance_id) {
 1143:             instance_id = se->instance_id + 1;
 1144:         }
 1145:     }
 1146:     return instance_id;
 1147: }
 1148: 
 1149: static int calculate_compat_instance_id(const char *idstr)
 1150: {
 1151:     SaveStateEntry *se;
 1152:     int instance_id = 0;
 1153: 
 1154:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1155:         if (!se->compat)
 1156:             continue;
 1157: 
 1158:         if (strcmp(idstr, se->compat->idstr) == 0
 1159:             && instance_id <= se->compat->instance_id) {
 1160:             instance_id = se->compat->instance_id + 1;
 1161:         }
 1162:     }
 1163:     return instance_id;
 1164: }
 1165: 
 1166: /* TODO: Individual devices generally have very little idea about the rest
 1167:    of the system, so instance_id should be removed/replaced.
 1168:    Meanwhile pass -1 as instance_id if you do not already have a clearly
 1169:    distinguishing id for all instances of your device class. */
 1170: int register_savevm_live(DeviceState *dev,
 1171:                          const char *idstr,
 1172:                          int instance_id,
 1173:                          int version_id,
 1174:                          SaveSetParamsHandler *set_params,
 1175:                          SaveLiveStateHandler *save_live_state,
 1176:                          SaveStateHandler *save_state,
 1177:                          LoadStateHandler *load_state,
 1178:                          void *opaque)
 1179: {
 1180:     SaveStateEntry *se;
 1181: 
 1182:     se = g_malloc0(sizeof(SaveStateEntry));
 1183:     se->version_id = version_id;
 1184:     se->section_id = global_section_id++;
 1185:     se->set_params = set_params;
 1186:     se->save_live_state = save_live_state;
 1187:     se->save_state = save_state;
 1188:     se->load_state = load_state;
 1189:     se->opaque = opaque;
 1190:     se->vmsd = NULL;
 1191:     se->no_migrate = 0;
 1192: 
 1193:     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
 1194:         char *id = dev->parent_bus->info->get_dev_path(dev);
 1195:         if (id) {
 1196:             pstrcpy(se->idstr, sizeof(se->idstr), id);
 1197:             pstrcat(se->idstr, sizeof(se->idstr), "/");
 1198:             g_free(id);
 1199: 
 1200:             se->compat = g_malloc0(sizeof(CompatEntry));
 1201:             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
 1202:             se->compat->instance_id = instance_id == -1 ?
 1203:                          calculate_compat_instance_id(idstr) : instance_id;
 1204:             instance_id = -1;
 1205:         }
 1206:     }
 1207:     pstrcat(se->idstr, sizeof(se->idstr), idstr);
 1208: 
 1209:     if (instance_id == -1) {
 1210:         se->instance_id = calculate_new_instance_id(se->idstr);
 1211:     } else {
 1212:         se->instance_id = instance_id;
 1213:     }
 1214:     assert(!se->compat || se->instance_id == 0);
 1215:     /* add at the end of list */
 1216:     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
 1217:     return 0;
 1218: }
 1219: 
 1220: int register_savevm(DeviceState *dev,
 1221:                     const char *idstr,
 1222:                     int instance_id,
 1223:                     int version_id,
 1224:                     SaveStateHandler *save_state,
 1225:                     LoadStateHandler *load_state,
 1226:                     void *opaque)
 1227: {
 1228:     return register_savevm_live(dev, idstr, instance_id, version_id,
 1229:                                 NULL, NULL, save_state, load_state, opaque);
 1230: }
 1231: 
 1232: void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
 1233: {
 1234:     SaveStateEntry *se, *new_se;
 1235:     char id[256] = "";
 1236: 
 1237:     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
 1238:         char *path = dev->parent_bus->info->get_dev_path(dev);
 1239:         if (path) {
 1240:             pstrcpy(id, sizeof(id), path);
 1241:             pstrcat(id, sizeof(id), "/");
 1242:             g_free(path);
 1243:         }
 1244:     }
 1245:     pstrcat(id, sizeof(id), idstr);
 1246: 
 1247:     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
 1248:         if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
 1249:             QTAILQ_REMOVE(&savevm_handlers, se, entry);
 1250:             if (se->compat) {
 1251:                 g_free(se->compat);
 1252:             }
 1253:             g_free(se);
 1254:         }
 1255:     }
 1256: }
 1257: 
 1258: int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
 1259:                                    const VMStateDescription *vmsd,
 1260:                                    void *opaque, int alias_id,
 1261:                                    int required_for_version)
 1262: {
 1263:     SaveStateEntry *se;
 1264: 
 1265:     /* If this triggers, alias support can be dropped for the vmsd. */
 1266:     assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);
 1267: 
 1268:     se = g_malloc0(sizeof(SaveStateEntry));
 1269:     se->version_id = vmsd->version_id;
 1270:     se->section_id = global_section_id++;
 1271:     se->save_live_state = NULL;
 1272:     se->save_state = NULL;
 1273:     se->load_state = NULL;
 1274:     se->opaque = opaque;
 1275:     se->vmsd = vmsd;
 1276:     se->alias_id = alias_id;
 1277:     se->no_migrate = vmsd->unmigratable;
 1278: 
 1279:     if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
 1280:         char *id = dev->parent_bus->info->get_dev_path(dev);
 1281:         if (id) {
 1282:             pstrcpy(se->idstr, sizeof(se->idstr), id);
 1283:             pstrcat(se->idstr, sizeof(se->idstr), "/");
 1284:             g_free(id);
 1285: 
 1286:             se->compat = g_malloc0(sizeof(CompatEntry));
 1287:             pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
 1288:             se->compat->instance_id = instance_id == -1 ?
 1289:                          calculate_compat_instance_id(vmsd->name) : instance_id;
 1290:             instance_id = -1;
 1291:         }
 1292:     }
 1293:     pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);
 1294: 
 1295:     if (instance_id == -1) {
 1296:         se->instance_id = calculate_new_instance_id(se->idstr);
 1297:     } else {
 1298:         se->instance_id = instance_id;
 1299:     }
 1300:     assert(!se->compat || se->instance_id == 0);
 1301:     /* add at the end of list */
 1302:     QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
 1303:     return 0;
 1304: }
 1305: 
 1306: int vmstate_register(DeviceState *dev, int instance_id,
 1307:                      const VMStateDescription *vmsd, void *opaque)
 1308: {
 1309:     return vmstate_register_with_alias_id(dev, instance_id, vmsd,
 1310:                                           opaque, -1, 0);
 1311: }
 1312: 
 1313: void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
 1314:                         void *opaque)
 1315: {
 1316:     SaveStateEntry *se, *new_se;
 1317: 
 1318:     QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
 1319:         if (se->vmsd == vmsd && se->opaque == opaque) {
 1320:             QTAILQ_REMOVE(&savevm_handlers, se, entry);
 1321:             if (se->compat) {
 1322:                 g_free(se->compat);
 1323:             }
 1324:             g_free(se);
 1325:         }
 1326:     }
 1327: }
 1328: 
 1329: static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
 1330:                                     void *opaque);
 1331: static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
 1332:                                    void *opaque);
 1333: 
 1334: int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
 1335:                        void *opaque, int version_id)
 1336: {
 1337:     VMStateField *field = vmsd->fields;
 1338:     int ret;
 1339: 
 1340:     if (version_id > vmsd->version_id) {
 1341:         return -EINVAL;
 1342:     }
 1343:     if (version_id < vmsd->minimum_version_id_old) {
 1344:         return -EINVAL;
 1345:     }
 1346:     if  (version_id < vmsd->minimum_version_id) {
 1347:         return vmsd->load_state_old(f, opaque, version_id);
 1348:     }
 1349:     if (vmsd->pre_load) {
 1350:         int ret = vmsd->pre_load(opaque);
 1351:         if (ret)
 1352:             return ret;
 1353:     }
 1354:     while(field->name) {
 1355:         if ((field->field_exists &&
 1356:              field->field_exists(opaque, version_id)) ||
 1357:             (!field->field_exists &&
 1358:              field->version_id <= version_id)) {
 1359:             void *base_addr = opaque + field->offset;
 1360:             int i, n_elems = 1;
 1361:             int size = field->size;
 1362: 
 1363:             if (field->flags & VMS_VBUFFER) {
 1364:                 size = *(int32_t *)(opaque+field->size_offset);
 1365:                 if (field->flags & VMS_MULTIPLY) {
 1366:                     size *= field->size;
 1367:                 }
 1368:             }
 1369:             if (field->flags & VMS_ARRAY) {
 1370:                 n_elems = field->num;
 1371:             } else if (field->flags & VMS_VARRAY_INT32) {
 1372:                 n_elems = *(int32_t *)(opaque+field->num_offset);
 1373:             } else if (field->flags & VMS_VARRAY_UINT32) {
 1374:                 n_elems = *(uint32_t *)(opaque+field->num_offset);
 1375:             } else if (field->flags & VMS_VARRAY_UINT16) {
 1376:                 n_elems = *(uint16_t *)(opaque+field->num_offset);
 1377:             } else if (field->flags & VMS_VARRAY_UINT8) {
 1378:                 n_elems = *(uint8_t *)(opaque+field->num_offset);
 1379:             }
 1380:             if (field->flags & VMS_POINTER) {
 1381:                 base_addr = *(void **)base_addr + field->start;
 1382:             }
 1383:             for (i = 0; i < n_elems; i++) {
 1384:                 void *addr = base_addr + size * i;
 1385: 
 1386:                 if (field->flags & VMS_ARRAY_OF_POINTER) {
 1387:                     addr = *(void **)addr;
 1388:                 }
 1389:                 if (field->flags & VMS_STRUCT) {
 1390:                     ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
 1391:                 } else {
 1392:                     ret = field->info->get(f, addr, size);
 1393: 
 1394:                 }
 1395:                 if (ret < 0) {
 1396:                     return ret;
 1397:                 }
 1398:             }
 1399:         }
 1400:         field++;
 1401:     }
 1402:     ret = vmstate_subsection_load(f, vmsd, opaque);
 1403:     if (ret != 0) {
 1404:         return ret;
 1405:     }
 1406:     if (vmsd->post_load) {
 1407:         return vmsd->post_load(opaque, version_id);
 1408:     }
 1409:     return 0;
 1410: }
 1411: 
 1412: void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
 1413:                         void *opaque)
 1414: {
 1415:     VMStateField *field = vmsd->fields;
 1416: 
 1417:     if (vmsd->pre_save) {
 1418:         vmsd->pre_save(opaque);
 1419:     }
 1420:     while(field->name) {
 1421:         if (!field->field_exists ||
 1422:             field->field_exists(opaque, vmsd->version_id)) {
 1423:             void *base_addr = opaque + field->offset;
 1424:             int i, n_elems = 1;
 1425:             int size = field->size;
 1426: 
 1427:             if (field->flags & VMS_VBUFFER) {
 1428:                 size = *(int32_t *)(opaque+field->size_offset);
 1429:                 if (field->flags & VMS_MULTIPLY) {
 1430:                     size *= field->size;
 1431:                 }
 1432:             }
 1433:             if (field->flags & VMS_ARRAY) {
 1434:                 n_elems = field->num;
 1435:             } else if (field->flags & VMS_VARRAY_INT32) {
 1436:                 n_elems = *(int32_t *)(opaque+field->num_offset);
 1437:             } else if (field->flags & VMS_VARRAY_UINT16) {
 1438:                 n_elems = *(uint16_t *)(opaque+field->num_offset);
 1439:             } else if (field->flags & VMS_VARRAY_UINT8) {
 1440:                 n_elems = *(uint8_t *)(opaque+field->num_offset);
 1441:             }
 1442:             if (field->flags & VMS_POINTER) {
 1443:                 base_addr = *(void **)base_addr + field->start;
 1444:             }
 1445:             for (i = 0; i < n_elems; i++) {
 1446:                 void *addr = base_addr + size * i;
 1447: 
 1448:                 if (field->flags & VMS_ARRAY_OF_POINTER) {
 1449:                     addr = *(void **)addr;
 1450:                 }
 1451:                 if (field->flags & VMS_STRUCT) {
 1452:                     vmstate_save_state(f, field->vmsd, addr);
 1453:                 } else {
 1454:                     field->info->put(f, addr, size);
 1455:                 }
 1456:             }
 1457:         }
 1458:         field++;
 1459:     }
 1460:     vmstate_subsection_save(f, vmsd, opaque);
 1461: }
 1462: 
 1463: static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
 1464: {
 1465:     if (!se->vmsd) {         /* Old style */
 1466:         return se->load_state(f, se->opaque, version_id);
 1467:     }
 1468:     return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
 1469: }
 1470: 
 1471: static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
 1472: {
 1473:     if (!se->vmsd) {         /* Old style */
 1474:         se->save_state(f, se->opaque);
 1475:         return;
 1476:     }
 1477:     vmstate_save_state(f,se->vmsd, se->opaque);
 1478: }
 1479: 
 1480: #define QEMU_VM_FILE_MAGIC           0x5145564d
 1481: #define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
 1482: #define QEMU_VM_FILE_VERSION         0x00000003
 1483: 
 1484: #define QEMU_VM_EOF                  0x00
 1485: #define QEMU_VM_SECTION_START        0x01
 1486: #define QEMU_VM_SECTION_PART         0x02
 1487: #define QEMU_VM_SECTION_END          0x03
 1488: #define QEMU_VM_SECTION_FULL         0x04
 1489: #define QEMU_VM_SUBSECTION           0x05
 1490: 
 1491: bool qemu_savevm_state_blocked(Monitor *mon)
 1492: {
 1493:     SaveStateEntry *se;
 1494: 
 1495:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1496:         if (se->no_migrate) {
 1497:             monitor_printf(mon, "state blocked by non-migratable device '%s'\n",
 1498:                            se->idstr);
 1499:             return true;
 1500:         }
 1501:     }
 1502:     return false;
 1503: }
 1504: 
 1505: int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
 1506:                             int shared)
 1507: {
 1508:     SaveStateEntry *se;
 1509:     int ret;
 1510: 
 1511:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1512:         if(se->set_params == NULL) {
 1513:             continue;
 1514: 	}
 1515: 	se->set_params(blk_enable, shared, se->opaque);
 1516:     }
 1517:     
 1518:     qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
 1519:     qemu_put_be32(f, QEMU_VM_FILE_VERSION);
 1520: 
 1521:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1522:         int len;
 1523: 
 1524:         if (se->save_live_state == NULL)
 1525:             continue;
 1526: 
 1527:         /* Section type */
 1528:         qemu_put_byte(f, QEMU_VM_SECTION_START);
 1529:         qemu_put_be32(f, se->section_id);
 1530: 
 1531:         /* ID string */
 1532:         len = strlen(se->idstr);
 1533:         qemu_put_byte(f, len);
 1534:         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
 1535: 
 1536:         qemu_put_be32(f, se->instance_id);
 1537:         qemu_put_be32(f, se->version_id);
 1538: 
 1539:         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
 1540:         if (ret < 0) {
 1541:             qemu_savevm_state_cancel(mon, f);
 1542:             return ret;
 1543:         }
 1544:     }
 1545:     ret = qemu_file_get_error(f);
 1546:     if (ret != 0) {
 1547:         qemu_savevm_state_cancel(mon, f);
 1548:     }
 1549: 
 1550:     return ret;
 1551: 
 1552: }
 1553: 
 1554: /*
 1555:  * this funtion has three return values:
 1556:  *   negative: there was one error, and we have -errno.
 1557:  *   0 : We haven't finished, caller have to go again
 1558:  *   1 : We have finished, we can go to complete phase
 1559:  */
 1560: int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
 1561: {
 1562:     SaveStateEntry *se;
 1563:     int ret = 1;
 1564: 
 1565:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1566:         if (se->save_live_state == NULL)
 1567:             continue;
 1568: 
 1569:         /* Section type */
 1570:         qemu_put_byte(f, QEMU_VM_SECTION_PART);
 1571:         qemu_put_be32(f, se->section_id);
 1572: 
 1573:         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
 1574:         if (ret <= 0) {
 1575:             /* Do not proceed to the next vmstate before this one reported
 1576:                completion of the current stage. This serializes the migration
 1577:                and reduces the probability that a faster changing state is
 1578:                synchronized over and over again. */
 1579:             break;
 1580:         }
 1581:     }
 1582:     if (ret != 0) {
 1583:         return ret;
 1584:     }
 1585:     ret = qemu_file_get_error(f);
 1586:     if (ret != 0) {
 1587:         qemu_savevm_state_cancel(mon, f);
 1588:     }
 1589:     return ret;
 1590: }
 1591: 
 1592: int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
 1593: {
 1594:     SaveStateEntry *se;
 1595:     int ret;
 1596: 
 1597:     cpu_synchronize_all_states();
 1598: 
 1599:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1600:         if (se->save_live_state == NULL)
 1601:             continue;
 1602: 
 1603:         /* Section type */
 1604:         qemu_put_byte(f, QEMU_VM_SECTION_END);
 1605:         qemu_put_be32(f, se->section_id);
 1606: 
 1607:         ret = se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
 1608:         if (ret < 0) {
 1609:             return ret;
 1610:         }
 1611:     }
 1612: 
 1613:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1614:         int len;
 1615: 
 1616: 	if (se->save_state == NULL && se->vmsd == NULL)
 1617: 	    continue;
 1618: 
 1619:         /* Section type */
 1620:         qemu_put_byte(f, QEMU_VM_SECTION_FULL);
 1621:         qemu_put_be32(f, se->section_id);
 1622: 
 1623:         /* ID string */
 1624:         len = strlen(se->idstr);
 1625:         qemu_put_byte(f, len);
 1626:         qemu_put_buffer(f, (uint8_t *)se->idstr, len);
 1627: 
 1628:         qemu_put_be32(f, se->instance_id);
 1629:         qemu_put_be32(f, se->version_id);
 1630: 
 1631:         vmstate_save(f, se);
 1632:     }
 1633: 
 1634:     qemu_put_byte(f, QEMU_VM_EOF);
 1635: 
 1636:     return qemu_file_get_error(f);
 1637: }
 1638: 
 1639: void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
 1640: {
 1641:     SaveStateEntry *se;
 1642: 
 1643:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1644:         if (se->save_live_state) {
 1645:             se->save_live_state(mon, f, -1, se->opaque);
 1646:         }
 1647:     }
 1648: }
 1649: 
 1650: static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
 1651: {
 1652:     int ret;
 1653: 
 1654:     if (qemu_savevm_state_blocked(mon)) {
 1655:         ret = -EINVAL;
 1656:         goto out;
 1657:     }
 1658: 
 1659:     ret = qemu_savevm_state_begin(mon, f, 0, 0);
 1660:     if (ret < 0)
 1661:         goto out;
 1662: 
 1663:     do {
 1664:         ret = qemu_savevm_state_iterate(mon, f);
 1665:         if (ret < 0)
 1666:             goto out;
 1667:     } while (ret == 0);
 1668: 
 1669:     ret = qemu_savevm_state_complete(mon, f);
 1670: 
 1671: out:
 1672:     if (ret == 0) {
 1673:         ret = qemu_file_get_error(f);
 1674:     }
 1675: 
 1676:     return ret;
 1677: }
 1678: 
 1679: static SaveStateEntry *find_se(const char *idstr, int instance_id)
 1680: {
 1681:     SaveStateEntry *se;
 1682: 
 1683:     QTAILQ_FOREACH(se, &savevm_handlers, entry) {
 1684:         if (!strcmp(se->idstr, idstr) &&
 1685:             (instance_id == se->instance_id ||
 1686:              instance_id == se->alias_id))
 1687:             return se;
 1688:         /* Migrating from an older version? */
 1689:         if (strstr(se->idstr, idstr) && se->compat) {
 1690:             if (!strcmp(se->compat->idstr, idstr) &&
 1691:                 (instance_id == se->compat->instance_id ||
 1692:                  instance_id == se->alias_id))
 1693:                 return se;
 1694:         }
 1695:     }
 1696:     return NULL;
 1697: }
 1698: 
 1699: static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
 1700: {
 1701:     while(sub && sub->needed) {
 1702:         if (strcmp(idstr, sub->vmsd->name) == 0) {
 1703:             return sub->vmsd;
 1704:         }
 1705:         sub++;
 1706:     }
 1707:     return NULL;
 1708: }
 1709: 
 1710: static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
 1711:                                    void *opaque)
 1712: {
 1713:     while (qemu_peek_byte(f, 0) == QEMU_VM_SUBSECTION) {
 1714:         char idstr[256];
 1715:         int ret;
 1716:         uint8_t version_id, len, size;
 1717:         const VMStateDescription *sub_vmsd;
 1718: 
 1719:         len = qemu_peek_byte(f, 1);
 1720:         if (len < strlen(vmsd->name) + 1) {
 1721:             /* subsection name has be be "section_name/a" */
 1722:             return 0;
 1723:         }
 1724:         size = qemu_peek_buffer(f, (uint8_t *)idstr, len, 2);
 1725:         if (size != len) {
 1726:             return 0;
 1727:         }
 1728:         idstr[size] = 0;
 1729: 
 1730:         if (strncmp(vmsd->name, idstr, strlen(vmsd->name)) != 0) {
 1731:             /* it don't have a valid subsection name */
 1732:             return 0;
 1733:         }
 1734:         sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
 1735:         if (sub_vmsd == NULL) {
 1736:             return -ENOENT;
 1737:         }
 1738:         qemu_file_skip(f, 1); /* subsection */
 1739:         qemu_file_skip(f, 1); /* len */
 1740:         qemu_file_skip(f, len); /* idstr */
 1741:         version_id = qemu_get_be32(f);
 1742: 
 1743:         ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
 1744:         if (ret) {
 1745:             return ret;
 1746:         }
 1747:     }
 1748:     return 0;
 1749: }
 1750: 
 1751: static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
 1752:                                     void *opaque)
 1753: {
 1754:     const VMStateSubsection *sub = vmsd->subsections;
 1755: 
 1756:     while (sub && sub->needed) {
 1757:         if (sub->needed(opaque)) {
 1758:             const VMStateDescription *vmsd = sub->vmsd;
 1759:             uint8_t len;
 1760: 
 1761:             qemu_put_byte(f, QEMU_VM_SUBSECTION);
 1762:             len = strlen(vmsd->name);
 1763:             qemu_put_byte(f, len);
 1764:             qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
 1765:             qemu_put_be32(f, vmsd->version_id);
 1766:             vmstate_save_state(f, vmsd, opaque);
 1767:         }
 1768:         sub++;
 1769:     }
 1770: }
 1771: 
 1772: typedef struct LoadStateEntry {
 1773:     QLIST_ENTRY(LoadStateEntry) entry;
 1774:     SaveStateEntry *se;
 1775:     int section_id;
 1776:     int version_id;
 1777: } LoadStateEntry;
 1778: 
 1779: int qemu_loadvm_state(QEMUFile *f)
 1780: {
 1781:     QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
 1782:         QLIST_HEAD_INITIALIZER(loadvm_handlers);
 1783:     LoadStateEntry *le, *new_le;
 1784:     uint8_t section_type;
 1785:     unsigned int v;
 1786:     int ret;
 1787: 
 1788:     if (qemu_savevm_state_blocked(default_mon)) {
 1789:         return -EINVAL;
 1790:     }
 1791: 
 1792:     v = qemu_get_be32(f);
 1793:     if (v != QEMU_VM_FILE_MAGIC)
 1794:         return -EINVAL;
 1795: 
 1796:     v = qemu_get_be32(f);
 1797:     if (v == QEMU_VM_FILE_VERSION_COMPAT) {
 1798:         fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
 1799:         return -ENOTSUP;
 1800:     }
 1801:     if (v != QEMU_VM_FILE_VERSION)
 1802:         return -ENOTSUP;
 1803: 
 1804:     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
 1805:         uint32_t instance_id, version_id, section_id;
 1806:         SaveStateEntry *se;
 1807:         char idstr[257];
 1808:         int len;
 1809: 
 1810:         switch (section_type) {
 1811:         case QEMU_VM_SECTION_START:
 1812:         case QEMU_VM_SECTION_FULL:
 1813:             /* Read section start */
 1814:             section_id = qemu_get_be32(f);
 1815:             len = qemu_get_byte(f);
 1816:             qemu_get_buffer(f, (uint8_t *)idstr, len);
 1817:             idstr[len] = 0;
 1818:             instance_id = qemu_get_be32(f);
 1819:             version_id = qemu_get_be32(f);
 1820: 
 1821:             /* Find savevm section */
 1822:             se = find_se(idstr, instance_id);
 1823:             if (se == NULL) {
 1824:                 fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
 1825:                 ret = -EINVAL;
 1826:                 goto out;
 1827:             }
 1828: 
 1829:             /* Validate version */
 1830:             if (version_id > se->version_id) {
 1831:                 fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
 1832:                         version_id, idstr, se->version_id);
 1833:                 ret = -EINVAL;
 1834:                 goto out;
 1835:             }
 1836: 
 1837:             /* Add entry */
 1838:             le = g_malloc0(sizeof(*le));
 1839: 
 1840:             le->se = se;
 1841:             le->section_id = section_id;
 1842:             le->version_id = version_id;
 1843:             QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
 1844: 
 1845:             ret = vmstate_load(f, le->se, le->version_id);
 1846:             if (ret < 0) {
 1847:                 fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
 1848:                         instance_id, idstr);
 1849:                 goto out;
 1850:             }
 1851:             break;
 1852:         case QEMU_VM_SECTION_PART:
 1853:         case QEMU_VM_SECTION_END:
 1854:             section_id = qemu_get_be32(f);
 1855: 
 1856:             QLIST_FOREACH(le, &loadvm_handlers, entry) {
 1857:                 if (le->section_id == section_id) {
 1858:                     break;
 1859:                 }
 1860:             }
 1861:             if (le == NULL) {
 1862:                 fprintf(stderr, "Unknown savevm section %d\n", section_id);
 1863:                 ret = -EINVAL;
 1864:                 goto out;
 1865:             }
 1866: 
 1867:             ret = vmstate_load(f, le->se, le->version_id);
 1868:             if (ret < 0) {
 1869:                 fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
 1870:                         section_id);
 1871:                 goto out;
 1872:             }
 1873:             break;
 1874:         default:
 1875:             fprintf(stderr, "Unknown savevm section type %d\n", section_type);
 1876:             ret = -EINVAL;
 1877:             goto out;
 1878:         }
 1879:     }
 1880: 
 1881:     cpu_synchronize_all_post_init();
 1882: 
 1883:     ret = 0;
 1884: 
 1885: out:
 1886:     QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
 1887:         QLIST_REMOVE(le, entry);
 1888:         g_free(le);
 1889:     }
 1890: 
 1891:     if (ret == 0) {
 1892:         ret = qemu_file_get_error(f);
 1893:     }
 1894: 
 1895:     return ret;
 1896: }
 1897: 
 1898: static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
 1899:                               const char *name)
 1900: {
 1901:     QEMUSnapshotInfo *sn_tab, *sn;
 1902:     int nb_sns, i, ret;
 1903: 
 1904:     ret = -ENOENT;
 1905:     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
 1906:     if (nb_sns < 0)
 1907:         return ret;
 1908:     for(i = 0; i < nb_sns; i++) {
 1909:         sn = &sn_tab[i];
 1910:         if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
 1911:             *sn_info = *sn;
 1912:             ret = 0;
 1913:             break;
 1914:         }
 1915:     }
 1916:     g_free(sn_tab);
 1917:     return ret;
 1918: }
 1919: 
 1920: /*
 1921:  * Deletes snapshots of a given name in all opened images.
 1922:  */
 1923: static int del_existing_snapshots(Monitor *mon, const char *name)
 1924: {
 1925:     BlockDriverState *bs;
 1926:     QEMUSnapshotInfo sn1, *snapshot = &sn1;
 1927:     int ret;
 1928: 
 1929:     bs = NULL;
 1930:     while ((bs = bdrv_next(bs))) {
 1931:         if (bdrv_can_snapshot(bs) &&
 1932:             bdrv_snapshot_find(bs, snapshot, name) >= 0)
 1933:         {
 1934:             ret = bdrv_snapshot_delete(bs, name);
 1935:             if (ret < 0) {
 1936:                 monitor_printf(mon,
 1937:                                "Error while deleting snapshot on '%s'\n",
 1938:                                bdrv_get_device_name(bs));
 1939:                 return -1;
 1940:             }
 1941:         }
 1942:     }
 1943: 
 1944:     return 0;
 1945: }
 1946: 
 1947: void do_savevm(Monitor *mon, const QDict *qdict)
 1948: {
 1949:     BlockDriverState *bs, *bs1;
 1950:     QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
 1951:     int ret;
 1952:     QEMUFile *f;
 1953:     int saved_vm_running;
 1954:     uint32_t vm_state_size;
 1955: #ifdef _WIN32
 1956:     struct _timeb tb;
 1957:     struct tm *ptm;
 1958: #else
 1959:     struct timeval tv;
 1960:     struct tm tm;
 1961: #endif
 1962:     const char *name = qdict_get_try_str(qdict, "name");
 1963: 
 1964:     /* Verify if there is a device that doesn't support snapshots and is writable */
 1965:     bs = NULL;
 1966:     while ((bs = bdrv_next(bs))) {
 1967: 
 1968:         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
 1969:             continue;
 1970:         }
 1971: 
 1972:         if (!bdrv_can_snapshot(bs)) {
 1973:             monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
 1974:                                bdrv_get_device_name(bs));
 1975:             return;
 1976:         }
 1977:     }
 1978: 
 1979:     bs = bdrv_snapshots();
 1980:     if (!bs) {
 1981:         monitor_printf(mon, "No block device can accept snapshots\n");
 1982:         return;
 1983:     }
 1984: 
 1985:     saved_vm_running = runstate_is_running();
 1986:     vm_stop(RUN_STATE_SAVE_VM);
 1987: 
 1988:     memset(sn, 0, sizeof(*sn));
 1989: 
 1990:     /* fill auxiliary fields */
 1991: #ifdef _WIN32
 1992:     _ftime(&tb);
 1993:     sn->date_sec = tb.time;
 1994:     sn->date_nsec = tb.millitm * 1000000;
 1995: #else
 1996:     gettimeofday(&tv, NULL);
 1997:     sn->date_sec = tv.tv_sec;
 1998:     sn->date_nsec = tv.tv_usec * 1000;
 1999: #endif
 2000:     sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock);
 2001: 
 2002:     if (name) {
 2003:         ret = bdrv_snapshot_find(bs, old_sn, name);
 2004:         if (ret >= 0) {
 2005:             pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
 2006:             pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
 2007:         } else {
 2008:             pstrcpy(sn->name, sizeof(sn->name), name);
 2009:         }
 2010:     } else {
 2011: #ifdef _WIN32
 2012:         ptm = localtime(&tb.time);
 2013:         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", ptm);
 2014: #else
 2015:         /* cast below needed for OpenBSD where tv_sec is still 'long' */
 2016:         localtime_r((const time_t *)&tv.tv_sec, &tm);
 2017:         strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);
 2018: #endif
 2019:     }
 2020: 
 2021:     /* Delete old snapshots of the same name */
 2022:     if (name && del_existing_snapshots(mon, name) < 0) {
 2023:         goto the_end;
 2024:     }
 2025: 
 2026:     /* save the VM state */
 2027:     f = qemu_fopen_bdrv(bs, 1);
 2028:     if (!f) {
 2029:         monitor_printf(mon, "Could not open VM state file\n");
 2030:         goto the_end;
 2031:     }
 2032:     ret = qemu_savevm_state(mon, f);
 2033:     vm_state_size = qemu_ftell(f);
 2034:     qemu_fclose(f);
 2035:     if (ret < 0) {
 2036:         monitor_printf(mon, "Error %d while writing VM\n", ret);
 2037:         goto the_end;
 2038:     }
 2039: 
 2040:     /* create the snapshots */
 2041: 
 2042:     bs1 = NULL;
 2043:     while ((bs1 = bdrv_next(bs1))) {
 2044:         if (bdrv_can_snapshot(bs1)) {
 2045:             /* Write VM state size only to the image that contains the state */
 2046:             sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
 2047:             ret = bdrv_snapshot_create(bs1, sn);
 2048:             if (ret < 0) {
 2049:                 monitor_printf(mon, "Error while creating snapshot on '%s'\n",
 2050:                                bdrv_get_device_name(bs1));
 2051:             }
 2052:         }
 2053:     }
 2054: 
 2055:  the_end:
 2056:     if (saved_vm_running)
 2057:         vm_start();
 2058: }
 2059: 
 2060: int load_vmstate(const char *name)
 2061: {
 2062:     BlockDriverState *bs, *bs_vm_state;
 2063:     QEMUSnapshotInfo sn;
 2064:     QEMUFile *f;
 2065:     int ret;
 2066: 
 2067:     bs_vm_state = bdrv_snapshots();
 2068:     if (!bs_vm_state) {
 2069:         error_report("No block device supports snapshots");
 2070:         return -ENOTSUP;
 2071:     }
 2072: 
 2073:     /* Don't even try to load empty VM states */
 2074:     ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
 2075:     if (ret < 0) {
 2076:         return ret;
 2077:     } else if (sn.vm_state_size == 0) {
 2078:         error_report("This is a disk-only snapshot. Revert to it offline "
 2079:             "using qemu-img.");
 2080:         return -EINVAL;
 2081:     }
 2082: 
 2083:     /* Verify if there is any device that doesn't support snapshots and is
 2084:     writable and check if the requested snapshot is available too. */
 2085:     bs = NULL;
 2086:     while ((bs = bdrv_next(bs))) {
 2087: 
 2088:         if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
 2089:             continue;
 2090:         }
 2091: 
 2092:         if (!bdrv_can_snapshot(bs)) {
 2093:             error_report("Device '%s' is writable but does not support snapshots.",
 2094:                                bdrv_get_device_name(bs));
 2095:             return -ENOTSUP;
 2096:         }
 2097: 
 2098:         ret = bdrv_snapshot_find(bs, &sn, name);
 2099:         if (ret < 0) {
 2100:             error_report("Device '%s' does not have the requested snapshot '%s'",
 2101:                            bdrv_get_device_name(bs), name);
 2102:             return ret;
 2103:         }
 2104:     }
 2105: 
 2106:     /* Flush all IO requests so they don't interfere with the new state.  */
 2107:     qemu_aio_flush();
 2108: 
 2109:     bs = NULL;
 2110:     while ((bs = bdrv_next(bs))) {
 2111:         if (bdrv_can_snapshot(bs)) {
 2112:             ret = bdrv_snapshot_goto(bs, name);
 2113:             if (ret < 0) {
 2114:                 error_report("Error %d while activating snapshot '%s' on '%s'",
 2115:                              ret, name, bdrv_get_device_name(bs));
 2116:                 return ret;
 2117:             }
 2118:         }
 2119:     }
 2120: 
 2121:     /* restore the VM state */
 2122:     f = qemu_fopen_bdrv(bs_vm_state, 0);
 2123:     if (!f) {
 2124:         error_report("Could not open VM state file");
 2125:         return -EINVAL;
 2126:     }
 2127: 
 2128:     qemu_system_reset(VMRESET_SILENT);
 2129:     ret = qemu_loadvm_state(f);
 2130: 
 2131:     qemu_fclose(f);
 2132:     if (ret < 0) {
 2133:         error_report("Error %d while loading VM state", ret);
 2134:         return ret;
 2135:     }
 2136: 
 2137:     return 0;
 2138: }
 2139: 
 2140: void do_delvm(Monitor *mon, const QDict *qdict)
 2141: {
 2142:     BlockDriverState *bs, *bs1;
 2143:     int ret;
 2144:     const char *name = qdict_get_str(qdict, "name");
 2145: 
 2146:     bs = bdrv_snapshots();
 2147:     if (!bs) {
 2148:         monitor_printf(mon, "No block device supports snapshots\n");
 2149:         return;
 2150:     }
 2151: 
 2152:     bs1 = NULL;
 2153:     while ((bs1 = bdrv_next(bs1))) {
 2154:         if (bdrv_can_snapshot(bs1)) {
 2155:             ret = bdrv_snapshot_delete(bs1, name);
 2156:             if (ret < 0) {
 2157:                 if (ret == -ENOTSUP)
 2158:                     monitor_printf(mon,
 2159:                                    "Snapshots not supported on device '%s'\n",
 2160:                                    bdrv_get_device_name(bs1));
 2161:                 else
 2162:                     monitor_printf(mon, "Error %d while deleting snapshot on "
 2163:                                    "'%s'\n", ret, bdrv_get_device_name(bs1));
 2164:             }
 2165:         }
 2166:     }
 2167: }
 2168: 
 2169: void do_info_snapshots(Monitor *mon)
 2170: {
 2171:     BlockDriverState *bs, *bs1;
 2172:     QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
 2173:     int nb_sns, i, ret, available;
 2174:     int total;
 2175:     int *available_snapshots;
 2176:     char buf[256];
 2177: 
 2178:     bs = bdrv_snapshots();
 2179:     if (!bs) {
 2180:         monitor_printf(mon, "No available block device supports snapshots\n");
 2181:         return;
 2182:     }
 2183: 
 2184:     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
 2185:     if (nb_sns < 0) {
 2186:         monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
 2187:         return;
 2188:     }
 2189: 
 2190:     if (nb_sns == 0) {
 2191:         monitor_printf(mon, "There is no snapshot available.\n");
 2192:         return;
 2193:     }
 2194: 
 2195:     available_snapshots = g_malloc0(sizeof(int) * nb_sns);
 2196:     total = 0;
 2197:     for (i = 0; i < nb_sns; i++) {
 2198:         sn = &sn_tab[i];
 2199:         available = 1;
 2200:         bs1 = NULL;
 2201: 
 2202:         while ((bs1 = bdrv_next(bs1))) {
 2203:             if (bdrv_can_snapshot(bs1) && bs1 != bs) {
 2204:                 ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
 2205:                 if (ret < 0) {
 2206:                     available = 0;
 2207:                     break;
 2208:                 }
 2209:             }
 2210:         }
 2211: 
 2212:         if (available) {
 2213:             available_snapshots[total] = i;
 2214:             total++;
 2215:         }
 2216:     }
 2217: 
 2218:     if (total > 0) {
 2219:         monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
 2220:         for (i = 0; i < total; i++) {
 2221:             sn = &sn_tab[available_snapshots[i]];
 2222:             monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
 2223:         }
 2224:     } else {
 2225:         monitor_printf(mon, "There is no suitable snapshot available\n");
 2226:     }
 2227: 
 2228:     g_free(sn_tab);
 2229:     g_free(available_snapshots);
 2230: 
 2231: }

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