savevm.c 45.0 KB
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/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include <sys/time.h>
#include <zlib.h>

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/* Needed early for CONFIG_BSD etc. */
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#include "config-host.h"

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#ifndef _WIN32
#include <sys/times.h>
#include <sys/wait.h>
#include <termios.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <dirent.h>
#include <netdb.h>
#include <sys/select.h>
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#ifdef CONFIG_BSD
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#include <sys/stat.h>
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
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#include <libutil.h>
#else
#include <util.h>
#endif
#ifdef __linux__
#include <pty.h>
#include <malloc.h>
#include <linux/rtc.h>
#endif
#endif
#endif

#ifdef _WIN32
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#include <windows.h>
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#include <malloc.h>
#include <sys/timeb.h>
#include <mmsystem.h>
#define getopt_long_only getopt_long
#define memalign(align, size) malloc(size)
#endif

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#include "qemu-common.h"
#include "hw/hw.h"
#include "net.h"
#include "monitor.h"
#include "sysemu.h"
#include "qemu-timer.h"
#include "qemu-char.h"
#include "block.h"
#include "audio/audio.h"
#include "migration.h"
#include "qemu_socket.h"
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#include "qemu-queue.h"
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/* point to the block driver where the snapshots are managed */
static BlockDriverState *bs_snapshots;

#define SELF_ANNOUNCE_ROUNDS 5

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#ifndef ETH_P_RARP
#define ETH_P_RARP 0x0835
#endif
#define ARP_HTYPE_ETH 0x0001
#define ARP_PTYPE_IP 0x0800
#define ARP_OP_REQUEST_REV 0x3

static int announce_self_create(uint8_t *buf,
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				uint8_t *mac_addr)
{
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    /* Ethernet header. */
    memset(buf, 0xff, 6);         /* destination MAC addr */
    memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
    *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */

    /* RARP header. */
    *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
    *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
    *(buf + 18) = 6; /* hardware addr length (ethernet) */
    *(buf + 19) = 4; /* protocol addr length (IPv4) */
    *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
    memcpy(buf + 22, mac_addr, 6); /* source hw addr */
    memset(buf + 28, 0x00, 4);     /* source protocol addr */
    memcpy(buf + 32, mac_addr, 6); /* target hw addr */
    memset(buf + 38, 0x00, 4);     /* target protocol addr */

    /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
    memset(buf + 42, 0x00, 18);

    return 60; /* len (FCS will be added by hardware) */
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}

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static void qemu_announce_self_iter(NICState *nic, void *opaque)
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{
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    uint8_t buf[60];
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    int len;

    len = announce_self_create(buf, nic->conf->macaddr.a);

    qemu_send_packet_raw(&nic->nc, buf, len);
}


static void qemu_announce_self_once(void *opaque)
{
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    static int count = SELF_ANNOUNCE_ROUNDS;
    QEMUTimer *timer = *(QEMUTimer **)opaque;
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    qemu_foreach_nic(qemu_announce_self_iter, NULL);

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    if (--count) {
        /* delay 50ms, 150ms, 250ms, ... */
        qemu_mod_timer(timer, qemu_get_clock(rt_clock) +
                       50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);
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    } else {
	    qemu_del_timer(timer);
	    qemu_free_timer(timer);
    }
}

void qemu_announce_self(void)
{
	static QEMUTimer *timer;
	timer = qemu_new_timer(rt_clock, qemu_announce_self_once, &timer);
	qemu_announce_self_once(&timer);
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}

/***********************************************************/
/* savevm/loadvm support */

#define IO_BUF_SIZE 32768

struct QEMUFile {
    QEMUFilePutBufferFunc *put_buffer;
    QEMUFileGetBufferFunc *get_buffer;
    QEMUFileCloseFunc *close;
    QEMUFileRateLimit *rate_limit;
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    QEMUFileSetRateLimit *set_rate_limit;
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    QEMUFileGetRateLimit *get_rate_limit;
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    void *opaque;
    int is_write;

    int64_t buf_offset; /* start of buffer when writing, end of buffer
                           when reading */
    int buf_index;
    int buf_size; /* 0 when writing */
    uint8_t buf[IO_BUF_SIZE];

    int has_error;
};

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typedef struct QEMUFileStdio
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{
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    FILE *stdio_file;
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    QEMUFile *file;
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} QEMUFileStdio;
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typedef struct QEMUFileSocket
{
    int fd;
    QEMUFile *file;
} QEMUFileSocket;

static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
{
    QEMUFileSocket *s = opaque;
    ssize_t len;

    do {
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        len = recv(s->fd, (void *)buf, size, 0);
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    } while (len == -1 && socket_error() == EINTR);

    if (len == -1)
        len = -socket_error();

    return len;
}

static int socket_close(void *opaque)
{
    QEMUFileSocket *s = opaque;
    qemu_free(s);
    return 0;
}

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static int stdio_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
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{
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    QEMUFileStdio *s = opaque;
    return fwrite(buf, 1, size, s->stdio_file);
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}

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static int stdio_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
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{
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    QEMUFileStdio *s = opaque;
    FILE *fp = s->stdio_file;
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    int bytes;

    do {
        clearerr(fp);
        bytes = fread(buf, 1, size, fp);
    } while ((bytes == 0) && ferror(fp) && (errno == EINTR));
    return bytes;
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}

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static int stdio_pclose(void *opaque)
{
    QEMUFileStdio *s = opaque;
    pclose(s->stdio_file);
    qemu_free(s);
    return 0;
}

static int stdio_fclose(void *opaque)
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{
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    QEMUFileStdio *s = opaque;
    fclose(s->stdio_file);
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    qemu_free(s);
    return 0;
}

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QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
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{
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    QEMUFileStdio *s;
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    if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
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        fprintf(stderr, "qemu_popen: Argument validity check failed\n");
        return NULL;
    }

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    s = qemu_mallocz(sizeof(QEMUFileStdio));
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    s->stdio_file = stdio_file;
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    if(mode[0] == 'r') {
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        s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_pclose, 
				 NULL, NULL, NULL);
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    } else {
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        s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_pclose, 
				 NULL, NULL, NULL);
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    }
    return s->file;
}

QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
{
    FILE *popen_file;

    popen_file = popen(command, mode);
    if(popen_file == NULL) {
        return NULL;
    }

    return qemu_popen(popen_file, mode);
}

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int qemu_stdio_fd(QEMUFile *f)
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{
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    QEMUFileStdio *p;
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    int fd;

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    p = (QEMUFileStdio *)f->opaque;
    fd = fileno(p->stdio_file);
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    return fd;
}

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QEMUFile *qemu_fdopen(int fd, const char *mode)
{
    QEMUFileStdio *s;

    if (mode == NULL ||
	(mode[0] != 'r' && mode[0] != 'w') ||
	mode[1] != 'b' || mode[2] != 0) {
        fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
        return NULL;
    }

    s = qemu_mallocz(sizeof(QEMUFileStdio));
    s->stdio_file = fdopen(fd, mode);
    if (!s->stdio_file)
        goto fail;

    if(mode[0] == 'r') {
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        s->file = qemu_fopen_ops(s, NULL, stdio_get_buffer, stdio_fclose, 
				 NULL, NULL, NULL);
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    } else {
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        s->file = qemu_fopen_ops(s, stdio_put_buffer, NULL, stdio_fclose, 
				 NULL, NULL, NULL);
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    }
    return s->file;

fail:
    qemu_free(s);
    return NULL;
}

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QEMUFile *qemu_fopen_socket(int fd)
{
    QEMUFileSocket *s = qemu_mallocz(sizeof(QEMUFileSocket));

    s->fd = fd;
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    s->file = qemu_fopen_ops(s, NULL, socket_get_buffer, socket_close, 
			     NULL, NULL, NULL);
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    return s->file;
}

static int file_put_buffer(void *opaque, const uint8_t *buf,
                            int64_t pos, int size)
{
    QEMUFileStdio *s = opaque;
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    fseek(s->stdio_file, pos, SEEK_SET);
    fwrite(buf, 1, size, s->stdio_file);
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    return size;
}

static int file_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
{
    QEMUFileStdio *s = opaque;
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    fseek(s->stdio_file, pos, SEEK_SET);
    return fread(buf, 1, size, s->stdio_file);
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}

QEMUFile *qemu_fopen(const char *filename, const char *mode)
{
    QEMUFileStdio *s;

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    if (mode == NULL ||
	(mode[0] != 'r' && mode[0] != 'w') ||
	mode[1] != 'b' || mode[2] != 0) {
        fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
        return NULL;
    }

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    s = qemu_mallocz(sizeof(QEMUFileStdio));

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    s->stdio_file = fopen(filename, mode);
    if (!s->stdio_file)
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        goto fail;
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    if(mode[0] == 'w') {
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        s->file = qemu_fopen_ops(s, file_put_buffer, NULL, stdio_fclose, 
				 NULL, NULL, NULL);
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    } else {
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        s->file = qemu_fopen_ops(s, NULL, file_get_buffer, stdio_fclose, 
			       NULL, NULL, NULL);
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    }
    return s->file;
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fail:
    qemu_free(s);
    return NULL;
}

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static int block_put_buffer(void *opaque, const uint8_t *buf,
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                           int64_t pos, int size)
{
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    bdrv_save_vmstate(opaque, buf, pos, size);
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    return size;
}

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static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
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{
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    return bdrv_load_vmstate(opaque, buf, pos, size);
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}

static int bdrv_fclose(void *opaque)
{
    return 0;
}

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static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
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{
    if (is_writable)
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        return qemu_fopen_ops(bs, block_put_buffer, NULL, bdrv_fclose, 
			      NULL, NULL, NULL);
    return qemu_fopen_ops(bs, NULL, block_get_buffer, bdrv_fclose, NULL, NULL, NULL);
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}

QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
                         QEMUFileGetBufferFunc *get_buffer,
                         QEMUFileCloseFunc *close,
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                         QEMUFileRateLimit *rate_limit,
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                         QEMUFileSetRateLimit *set_rate_limit,
                         QEMUFileGetRateLimit *get_rate_limit)
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{
    QEMUFile *f;

    f = qemu_mallocz(sizeof(QEMUFile));

    f->opaque = opaque;
    f->put_buffer = put_buffer;
    f->get_buffer = get_buffer;
    f->close = close;
    f->rate_limit = rate_limit;
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    f->set_rate_limit = set_rate_limit;
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    f->get_rate_limit = get_rate_limit;
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    f->is_write = 0;

    return f;
}

int qemu_file_has_error(QEMUFile *f)
{
    return f->has_error;
}

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void qemu_file_set_error(QEMUFile *f)
{
    f->has_error = 1;
}

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void qemu_fflush(QEMUFile *f)
{
    if (!f->put_buffer)
        return;

    if (f->is_write && f->buf_index > 0) {
        int len;

        len = f->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
        if (len > 0)
            f->buf_offset += f->buf_index;
        else
            f->has_error = 1;
        f->buf_index = 0;
    }
}

static void qemu_fill_buffer(QEMUFile *f)
{
    int len;

    if (!f->get_buffer)
        return;

    if (f->is_write)
        abort();

    len = f->get_buffer(f->opaque, f->buf, f->buf_offset, IO_BUF_SIZE);
    if (len > 0) {
        f->buf_index = 0;
        f->buf_size = len;
        f->buf_offset += len;
    } else if (len != -EAGAIN)
        f->has_error = 1;
}

int qemu_fclose(QEMUFile *f)
{
    int ret = 0;
    qemu_fflush(f);
    if (f->close)
        ret = f->close(f->opaque);
    qemu_free(f);
    return ret;
}

void qemu_file_put_notify(QEMUFile *f)
{
    f->put_buffer(f->opaque, NULL, 0, 0);
}

void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
{
    int l;

    if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
        fprintf(stderr,
                "Attempted to write to buffer while read buffer is not empty\n");
        abort();
    }

    while (!f->has_error && size > 0) {
        l = IO_BUF_SIZE - f->buf_index;
        if (l > size)
            l = size;
        memcpy(f->buf + f->buf_index, buf, l);
        f->is_write = 1;
        f->buf_index += l;
        buf += l;
        size -= l;
        if (f->buf_index >= IO_BUF_SIZE)
            qemu_fflush(f);
    }
}

void qemu_put_byte(QEMUFile *f, int v)
{
    if (!f->has_error && f->is_write == 0 && f->buf_index > 0) {
        fprintf(stderr,
                "Attempted to write to buffer while read buffer is not empty\n");
        abort();
    }

    f->buf[f->buf_index++] = v;
    f->is_write = 1;
    if (f->buf_index >= IO_BUF_SIZE)
        qemu_fflush(f);
}

int qemu_get_buffer(QEMUFile *f, uint8_t *buf, int size1)
{
    int size, l;

    if (f->is_write)
        abort();

    size = size1;
    while (size > 0) {
        l = f->buf_size - f->buf_index;
        if (l == 0) {
            qemu_fill_buffer(f);
            l = f->buf_size - f->buf_index;
            if (l == 0)
                break;
        }
        if (l > size)
            l = size;
        memcpy(buf, f->buf + f->buf_index, l);
        f->buf_index += l;
        buf += l;
        size -= l;
    }
    return size1 - size;
}

int qemu_get_byte(QEMUFile *f)
{
    if (f->is_write)
        abort();

    if (f->buf_index >= f->buf_size) {
        qemu_fill_buffer(f);
        if (f->buf_index >= f->buf_size)
            return 0;
    }
    return f->buf[f->buf_index++];
}

int64_t qemu_ftell(QEMUFile *f)
{
    return f->buf_offset - f->buf_size + f->buf_index;
}

int64_t qemu_fseek(QEMUFile *f, int64_t pos, int whence)
{
    if (whence == SEEK_SET) {
        /* nothing to do */
    } else if (whence == SEEK_CUR) {
        pos += qemu_ftell(f);
    } else {
        /* SEEK_END not supported */
        return -1;
    }
    if (f->put_buffer) {
        qemu_fflush(f);
        f->buf_offset = pos;
    } else {
        f->buf_offset = pos;
        f->buf_index = 0;
        f->buf_size = 0;
    }
    return pos;
}

int qemu_file_rate_limit(QEMUFile *f)
{
    if (f->rate_limit)
        return f->rate_limit(f->opaque);

    return 0;
}

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size_t qemu_file_get_rate_limit(QEMUFile *f)
{
    if (f->get_rate_limit)
        return f->get_rate_limit(f->opaque);

    return 0;
}

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size_t qemu_file_set_rate_limit(QEMUFile *f, size_t new_rate)
{
613 614 615
    /* any failed or completed migration keeps its state to allow probing of
     * migration data, but has no associated file anymore */
    if (f && f->set_rate_limit)
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        return f->set_rate_limit(f->opaque, new_rate);

    return 0;
}

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void qemu_put_be16(QEMUFile *f, unsigned int v)
{
    qemu_put_byte(f, v >> 8);
    qemu_put_byte(f, v);
}

void qemu_put_be32(QEMUFile *f, unsigned int v)
{
    qemu_put_byte(f, v >> 24);
    qemu_put_byte(f, v >> 16);
    qemu_put_byte(f, v >> 8);
    qemu_put_byte(f, v);
}

void qemu_put_be64(QEMUFile *f, uint64_t v)
{
    qemu_put_be32(f, v >> 32);
    qemu_put_be32(f, v);
}

unsigned int qemu_get_be16(QEMUFile *f)
{
    unsigned int v;
    v = qemu_get_byte(f) << 8;
    v |= qemu_get_byte(f);
    return v;
}

unsigned int qemu_get_be32(QEMUFile *f)
{
    unsigned int v;
    v = qemu_get_byte(f) << 24;
    v |= qemu_get_byte(f) << 16;
    v |= qemu_get_byte(f) << 8;
    v |= qemu_get_byte(f);
    return v;
}

uint64_t qemu_get_be64(QEMUFile *f)
{
    uint64_t v;
    v = (uint64_t)qemu_get_be32(f) << 32;
    v |= qemu_get_be32(f);
    return v;
}

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/* 8 bit int */

static int get_int8(QEMUFile *f, void *pv, size_t size)
{
    int8_t *v = pv;
    qemu_get_s8s(f, v);
    return 0;
}

676
static void put_int8(QEMUFile *f, void *pv, size_t size)
677
{
678
    int8_t *v = pv;
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
    qemu_put_s8s(f, v);
}

const VMStateInfo vmstate_info_int8 = {
    .name = "int8",
    .get  = get_int8,
    .put  = put_int8,
};

/* 16 bit int */

static int get_int16(QEMUFile *f, void *pv, size_t size)
{
    int16_t *v = pv;
    qemu_get_sbe16s(f, v);
    return 0;
}

697
static void put_int16(QEMUFile *f, void *pv, size_t size)
698
{
699
    int16_t *v = pv;
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    qemu_put_sbe16s(f, v);
}

const VMStateInfo vmstate_info_int16 = {
    .name = "int16",
    .get  = get_int16,
    .put  = put_int16,
};

/* 32 bit int */

static int get_int32(QEMUFile *f, void *pv, size_t size)
{
    int32_t *v = pv;
    qemu_get_sbe32s(f, v);
    return 0;
}

718
static void put_int32(QEMUFile *f, void *pv, size_t size)
719
{
720
    int32_t *v = pv;
721 722 723 724 725 726 727 728 729
    qemu_put_sbe32s(f, v);
}

const VMStateInfo vmstate_info_int32 = {
    .name = "int32",
    .get  = get_int32,
    .put  = put_int32,
};

730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749
/* 32 bit int. See that the received value is the same than the one
   in the field */

static int get_int32_equal(QEMUFile *f, void *pv, size_t size)
{
    int32_t *v = pv;
    int32_t v2;
    qemu_get_sbe32s(f, &v2);

    if (*v == v2)
        return 0;
    return -EINVAL;
}

const VMStateInfo vmstate_info_int32_equal = {
    .name = "int32 equal",
    .get  = get_int32_equal,
    .put  = put_int32,
};

750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
/* 32 bit int. See that the received value is the less or the same
   than the one in the field */

static int get_int32_le(QEMUFile *f, void *pv, size_t size)
{
    int32_t *old = pv;
    int32_t new;
    qemu_get_sbe32s(f, &new);

    if (*old <= new)
        return 0;
    return -EINVAL;
}

const VMStateInfo vmstate_info_int32_le = {
    .name = "int32 equal",
    .get  = get_int32_le,
    .put  = put_int32,
};

770 771 772 773 774 775 776 777 778
/* 64 bit int */

static int get_int64(QEMUFile *f, void *pv, size_t size)
{
    int64_t *v = pv;
    qemu_get_sbe64s(f, v);
    return 0;
}

779
static void put_int64(QEMUFile *f, void *pv, size_t size)
780
{
781
    int64_t *v = pv;
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    qemu_put_sbe64s(f, v);
}

const VMStateInfo vmstate_info_int64 = {
    .name = "int64",
    .get  = get_int64,
    .put  = put_int64,
};

/* 8 bit unsigned int */

static int get_uint8(QEMUFile *f, void *pv, size_t size)
{
    uint8_t *v = pv;
    qemu_get_8s(f, v);
    return 0;
}

800
static void put_uint8(QEMUFile *f, void *pv, size_t size)
801
{
802
    uint8_t *v = pv;
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    qemu_put_8s(f, v);
}

const VMStateInfo vmstate_info_uint8 = {
    .name = "uint8",
    .get  = get_uint8,
    .put  = put_uint8,
};

/* 16 bit unsigned int */

static int get_uint16(QEMUFile *f, void *pv, size_t size)
{
    uint16_t *v = pv;
    qemu_get_be16s(f, v);
    return 0;
}

821
static void put_uint16(QEMUFile *f, void *pv, size_t size)
822
{
823
    uint16_t *v = pv;
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    qemu_put_be16s(f, v);
}

const VMStateInfo vmstate_info_uint16 = {
    .name = "uint16",
    .get  = get_uint16,
    .put  = put_uint16,
};

/* 32 bit unsigned int */

static int get_uint32(QEMUFile *f, void *pv, size_t size)
{
    uint32_t *v = pv;
    qemu_get_be32s(f, v);
    return 0;
}

842
static void put_uint32(QEMUFile *f, void *pv, size_t size)
843
{
844
    uint32_t *v = pv;
845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862
    qemu_put_be32s(f, v);
}

const VMStateInfo vmstate_info_uint32 = {
    .name = "uint32",
    .get  = get_uint32,
    .put  = put_uint32,
};

/* 64 bit unsigned int */

static int get_uint64(QEMUFile *f, void *pv, size_t size)
{
    uint64_t *v = pv;
    qemu_get_be64s(f, v);
    return 0;
}

863
static void put_uint64(QEMUFile *f, void *pv, size_t size)
864
{
865
    uint64_t *v = pv;
866 867 868 869 870 871 872 873 874
    qemu_put_be64s(f, v);
}

const VMStateInfo vmstate_info_uint64 = {
    .name = "uint64",
    .get  = get_uint64,
    .put  = put_uint64,
};

875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
/* 8 bit int. See that the received value is the same than the one
   in the field */

static int get_uint8_equal(QEMUFile *f, void *pv, size_t size)
{
    uint8_t *v = pv;
    uint8_t v2;
    qemu_get_8s(f, &v2);

    if (*v == v2)
        return 0;
    return -EINVAL;
}

const VMStateInfo vmstate_info_uint8_equal = {
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    .name = "uint8 equal",
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    .get  = get_uint8_equal,
    .put  = put_uint8,
};

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/* 16 bit unsigned int int. See that the received value is the same than the one
   in the field */

static int get_uint16_equal(QEMUFile *f, void *pv, size_t size)
{
    uint16_t *v = pv;
    uint16_t v2;
    qemu_get_be16s(f, &v2);

    if (*v == v2)
        return 0;
    return -EINVAL;
}

const VMStateInfo vmstate_info_uint16_equal = {
    .name = "uint16 equal",
    .get  = get_uint16_equal,
    .put  = put_uint16,
};

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/* timers  */

static int get_timer(QEMUFile *f, void *pv, size_t size)
{
    QEMUTimer *v = pv;
    qemu_get_timer(f, v);
    return 0;
}

924
static void put_timer(QEMUFile *f, void *pv, size_t size)
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{
926
    QEMUTimer *v = pv;
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    qemu_put_timer(f, v);
}

const VMStateInfo vmstate_info_timer = {
    .name = "timer",
    .get  = get_timer,
    .put  = put_timer,
};

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/* uint8_t buffers */

static int get_buffer(QEMUFile *f, void *pv, size_t size)
{
    uint8_t *v = pv;
    qemu_get_buffer(f, v, size);
    return 0;
}

945
static void put_buffer(QEMUFile *f, void *pv, size_t size)
946
{
947
    uint8_t *v = pv;
948 949 950 951 952 953 954 955 956
    qemu_put_buffer(f, v, size);
}

const VMStateInfo vmstate_info_buffer = {
    .name = "buffer",
    .get  = get_buffer,
    .put  = put_buffer,
};

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/* unused buffers: space that was used for some fields that are
   not usefull anymore */

static int get_unused_buffer(QEMUFile *f, void *pv, size_t size)
{
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    uint8_t buf[1024];
    int block_len;

    while (size > 0) {
        block_len = MIN(sizeof(buf), size);
        size -= block_len;
        qemu_get_buffer(f, buf, block_len);
    }
   return 0;
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}

static void put_unused_buffer(QEMUFile *f, void *pv, size_t size)
{
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    static const uint8_t buf[1024];
    int block_len;

    while (size > 0) {
        block_len = MIN(sizeof(buf), size);
        size -= block_len;
        qemu_put_buffer(f, buf, block_len);
    }
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}

const VMStateInfo vmstate_info_unused_buffer = {
    .name = "unused_buffer",
    .get  = get_unused_buffer,
    .put  = put_unused_buffer,
};

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typedef struct SaveStateEntry {
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    QTAILQ_ENTRY(SaveStateEntry) entry;
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    char idstr[256];
    int instance_id;
    int version_id;
    int section_id;
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    SaveSetParamsHandler *set_params;
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    SaveLiveStateHandler *save_live_state;
    SaveStateHandler *save_state;
    LoadStateHandler *load_state;
1001
    const VMStateDescription *vmsd;
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    void *opaque;
} SaveStateEntry;

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static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
    QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1008
static int global_section_id;
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static int calculate_new_instance_id(const char *idstr)
{
    SaveStateEntry *se;
    int instance_id = 0;

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    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
1016 1017 1018 1019 1020 1021 1022 1023
        if (strcmp(idstr, se->idstr) == 0
            && instance_id <= se->instance_id) {
            instance_id = se->instance_id + 1;
        }
    }
    return instance_id;
}

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/* TODO: Individual devices generally have very little idea about the rest
   of the system, so instance_id should be removed/replaced.
   Meanwhile pass -1 as instance_id if you do not already have a clearly
   distinguishing id for all instances of your device class. */
int register_savevm_live(const char *idstr,
                         int instance_id,
                         int version_id,
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                         SaveSetParamsHandler *set_params,
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                         SaveLiveStateHandler *save_live_state,
                         SaveStateHandler *save_state,
                         LoadStateHandler *load_state,
                         void *opaque)
{
1037
    SaveStateEntry *se;
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    se = qemu_mallocz(sizeof(SaveStateEntry));
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    pstrcpy(se->idstr, sizeof(se->idstr), idstr);
    se->version_id = version_id;
    se->section_id = global_section_id++;
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    se->set_params = set_params;
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    se->save_live_state = save_live_state;
    se->save_state = save_state;
    se->load_state = load_state;
    se->opaque = opaque;
1048
    se->vmsd = NULL;
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1050 1051 1052 1053
    if (instance_id == -1) {
        se->instance_id = calculate_new_instance_id(idstr);
    } else {
        se->instance_id = instance_id;
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    }
1055
    /* add at the end of list */
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    QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
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    return 0;
}

int register_savevm(const char *idstr,
                    int instance_id,
                    int version_id,
                    SaveStateHandler *save_state,
                    LoadStateHandler *load_state,
                    void *opaque)
{
    return register_savevm_live(idstr, instance_id, version_id,
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                                NULL, NULL, save_state, load_state, opaque);
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}

1071 1072
void unregister_savevm(const char *idstr, void *opaque)
{
1073
    SaveStateEntry *se, *new_se;
1074

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    QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1076
        if (strcmp(se->idstr, idstr) == 0 && se->opaque == opaque) {
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            QTAILQ_REMOVE(&savevm_handlers, se, entry);
1078
            qemu_free(se);
1079 1080 1081 1082
        }
    }
}

1083 1084 1085
int vmstate_register(int instance_id, const VMStateDescription *vmsd,
                     void *opaque)
{
1086
    SaveStateEntry *se;
1087

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    se = qemu_mallocz(sizeof(SaveStateEntry));
1089 1090 1091 1092 1093 1094 1095 1096 1097
    pstrcpy(se->idstr, sizeof(se->idstr), vmsd->name);
    se->version_id = vmsd->version_id;
    se->section_id = global_section_id++;
    se->save_live_state = NULL;
    se->save_state = NULL;
    se->load_state = NULL;
    se->opaque = opaque;
    se->vmsd = vmsd;

1098 1099 1100 1101
    if (instance_id == -1) {
        se->instance_id = calculate_new_instance_id(vmsd->name);
    } else {
        se->instance_id = instance_id;
1102
    }
1103
    /* add at the end of list */
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    QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1105 1106 1107
    return 0;
}

1108
void vmstate_unregister(const VMStateDescription *vmsd, void *opaque)
1109
{
1110 1111
    SaveStateEntry *se, *new_se;

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    QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1113
        if (se->vmsd == vmsd && se->opaque == opaque) {
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            QTAILQ_REMOVE(&savevm_handlers, se, entry);
1115 1116 1117
            qemu_free(se);
        }
    }
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133
}

int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
                       void *opaque, int version_id)
{
    VMStateField *field = vmsd->fields;

    if (version_id > vmsd->version_id) {
        return -EINVAL;
    }
    if (version_id < vmsd->minimum_version_id_old) {
        return -EINVAL;
    }
    if  (version_id < vmsd->minimum_version_id) {
        return vmsd->load_state_old(f, opaque, version_id);
    }
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    if (vmsd->pre_load) {
        int ret = vmsd->pre_load(opaque);
        if (ret)
            return ret;
    }
1139
    while(field->name) {
1140 1141 1142 1143
        if ((field->field_exists &&
             field->field_exists(opaque, version_id)) ||
            (!field->field_exists &&
             field->version_id <= version_id)) {
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            void *base_addr = opaque + field->offset;
            int ret, i, n_elems = 1;
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            int size = field->size;
1147

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            if (field->flags & VMS_VBUFFER) {
                size = *(int32_t *)(opaque+field->size_offset);
1150 1151 1152
                if (field->flags & VMS_MULTIPLY) {
                    size *= field->size;
                }
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            }
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            if (field->flags & VMS_ARRAY) {
                n_elems = field->num;
1156 1157
            } else if (field->flags & VMS_VARRAY_INT32) {
                n_elems = *(int32_t *)(opaque+field->num_offset);
1158 1159
            } else if (field->flags & VMS_VARRAY_UINT16) {
                n_elems = *(uint16_t *)(opaque+field->num_offset);
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            }
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            if (field->flags & VMS_POINTER) {
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                base_addr = *(void **)base_addr + field->start;
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            }
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            for (i = 0; i < n_elems; i++) {
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                void *addr = base_addr + size * i;
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                if (field->flags & VMS_ARRAY_OF_POINTER) {
                    addr = *(void **)addr;
                }
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                if (field->flags & VMS_STRUCT) {
1171
                    ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
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                } else {
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                    ret = field->info->get(f, addr, size);
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                }
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                if (ret < 0) {
                    return ret;
                }
1179 1180 1181 1182
            }
        }
        field++;
    }
1183
    if (vmsd->post_load) {
1184
        return vmsd->post_load(opaque, version_id);
1185
    }
1186 1187 1188 1189
    return 0;
}

void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1190
                        void *opaque)
1191 1192 1193
{
    VMStateField *field = vmsd->fields;

1194 1195 1196
    if (vmsd->pre_save) {
        vmsd->pre_save(opaque);
    }
1197
    while(field->name) {
1198 1199 1200 1201
        if (!field->field_exists ||
            field->field_exists(opaque, vmsd->version_id)) {
            void *base_addr = opaque + field->offset;
            int i, n_elems = 1;
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            int size = field->size;
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            if (field->flags & VMS_VBUFFER) {
                size = *(int32_t *)(opaque+field->size_offset);
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                if (field->flags & VMS_MULTIPLY) {
                    size *= field->size;
                }
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            }
1210 1211
            if (field->flags & VMS_ARRAY) {
                n_elems = field->num;
1212 1213
            } else if (field->flags & VMS_VARRAY_INT32) {
                n_elems = *(int32_t *)(opaque+field->num_offset);
1214 1215
            } else if (field->flags & VMS_VARRAY_UINT16) {
                n_elems = *(uint16_t *)(opaque+field->num_offset);
1216 1217
            }
            if (field->flags & VMS_POINTER) {
J
Juan Quintela 已提交
1218
                base_addr = *(void **)base_addr + field->start;
1219 1220
            }
            for (i = 0; i < n_elems; i++) {
J
Juan Quintela 已提交
1221
                void *addr = base_addr + size * i;
J
Juan Quintela 已提交
1222

1223 1224 1225
                if (field->flags & VMS_ARRAY_OF_POINTER) {
                    addr = *(void **)addr;
                }
1226 1227 1228
                if (field->flags & VMS_STRUCT) {
                    vmstate_save_state(f, field->vmsd, addr);
                } else {
J
Juan Quintela 已提交
1229
                    field->info->put(f, addr, size);
1230
                }
J
Juan Quintela 已提交
1231
            }
J
Juan Quintela 已提交
1232
        }
1233 1234
        field++;
    }
1235 1236 1237
    if (vmsd->post_save) {
        vmsd->post_save(opaque);
    }
1238 1239
}

1240 1241
static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
{
1242 1243 1244 1245
    if (!se->vmsd) {         /* Old style */
        return se->load_state(f, se->opaque, version_id);
    }
    return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
1246 1247 1248 1249
}

static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
{
1250 1251 1252 1253 1254
    if (!se->vmsd) {         /* Old style */
        se->save_state(f, se->opaque);
        return;
    }
    vmstate_save_state(f,se->vmsd, se->opaque);
1255 1256
}

A
aliguori 已提交
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266
#define QEMU_VM_FILE_MAGIC           0x5145564d
#define QEMU_VM_FILE_VERSION_COMPAT  0x00000002
#define QEMU_VM_FILE_VERSION         0x00000003

#define QEMU_VM_EOF                  0x00
#define QEMU_VM_SECTION_START        0x01
#define QEMU_VM_SECTION_PART         0x02
#define QEMU_VM_SECTION_END          0x03
#define QEMU_VM_SECTION_FULL         0x04

L
lirans@il.ibm.com 已提交
1267
int qemu_savevm_state_begin(QEMUFile *f, int blk_enable, int shared)
A
aliguori 已提交
1268 1269 1270
{
    SaveStateEntry *se;

L
lirans@il.ibm.com 已提交
1271 1272 1273 1274 1275 1276 1277
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
        if(se->set_params == NULL) {
            continue;
	}
	se->set_params(blk_enable, shared, se->opaque);
    }
    
A
aliguori 已提交
1278 1279 1280
    qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
    qemu_put_be32(f, QEMU_VM_FILE_VERSION);

B
Blue Swirl 已提交
1281
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
        int len;

        if (se->save_live_state == NULL)
            continue;

        /* Section type */
        qemu_put_byte(f, QEMU_VM_SECTION_START);
        qemu_put_be32(f, se->section_id);

        /* ID string */
        len = strlen(se->idstr);
        qemu_put_byte(f, len);
        qemu_put_buffer(f, (uint8_t *)se->idstr, len);

        qemu_put_be32(f, se->instance_id);
        qemu_put_be32(f, se->version_id);

        se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
    }

    if (qemu_file_has_error(f))
        return -EIO;

    return 0;
}

int qemu_savevm_state_iterate(QEMUFile *f)
{
    SaveStateEntry *se;
    int ret = 1;

B
Blue Swirl 已提交
1313
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336
        if (se->save_live_state == NULL)
            continue;

        /* Section type */
        qemu_put_byte(f, QEMU_VM_SECTION_PART);
        qemu_put_be32(f, se->section_id);

        ret &= !!se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
    }

    if (ret)
        return 1;

    if (qemu_file_has_error(f))
        return -EIO;

    return 0;
}

int qemu_savevm_state_complete(QEMUFile *f)
{
    SaveStateEntry *se;

B
Blue Swirl 已提交
1337
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1338 1339 1340 1341 1342 1343 1344 1345 1346 1347
        if (se->save_live_state == NULL)
            continue;

        /* Section type */
        qemu_put_byte(f, QEMU_VM_SECTION_END);
        qemu_put_be32(f, se->section_id);

        se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
    }

B
Blue Swirl 已提交
1348
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1349 1350
        int len;

1351
	if (se->save_state == NULL && se->vmsd == NULL)
A
aliguori 已提交
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365
	    continue;

        /* Section type */
        qemu_put_byte(f, QEMU_VM_SECTION_FULL);
        qemu_put_be32(f, se->section_id);

        /* ID string */
        len = strlen(se->idstr);
        qemu_put_byte(f, len);
        qemu_put_buffer(f, (uint8_t *)se->idstr, len);

        qemu_put_be32(f, se->instance_id);
        qemu_put_be32(f, se->version_id);

1366
        vmstate_save(f, se);
A
aliguori 已提交
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386
    }

    qemu_put_byte(f, QEMU_VM_EOF);

    if (qemu_file_has_error(f))
        return -EIO;

    return 0;
}

int qemu_savevm_state(QEMUFile *f)
{
    int saved_vm_running;
    int ret;

    saved_vm_running = vm_running;
    vm_stop(0);

    bdrv_flush_all();

L
lirans@il.ibm.com 已提交
1387
    ret = qemu_savevm_state_begin(f, 0, 0);
A
aliguori 已提交
1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412
    if (ret < 0)
        goto out;

    do {
        ret = qemu_savevm_state_iterate(f);
        if (ret < 0)
            goto out;
    } while (ret == 0);

    ret = qemu_savevm_state_complete(f);

out:
    if (qemu_file_has_error(f))
        ret = -EIO;

    if (!ret && saved_vm_running)
        vm_start();

    return ret;
}

static SaveStateEntry *find_se(const char *idstr, int instance_id)
{
    SaveStateEntry *se;

B
Blue Swirl 已提交
1413
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1414 1415 1416 1417 1418 1419 1420 1421
        if (!strcmp(se->idstr, idstr) &&
            instance_id == se->instance_id)
            return se;
    }
    return NULL;
}

typedef struct LoadStateEntry {
B
Blue Swirl 已提交
1422
    QLIST_ENTRY(LoadStateEntry) entry;
A
aliguori 已提交
1423 1424 1425 1426 1427 1428 1429
    SaveStateEntry *se;
    int section_id;
    int version_id;
} LoadStateEntry;

int qemu_loadvm_state(QEMUFile *f)
{
B
Blue Swirl 已提交
1430 1431
    QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
        QLIST_HEAD_INITIALIZER(loadvm_handlers);
1432
    LoadStateEntry *le, *new_le;
A
aliguori 已提交
1433 1434 1435 1436 1437 1438 1439 1440 1441
    uint8_t section_type;
    unsigned int v;
    int ret;

    v = qemu_get_be32(f);
    if (v != QEMU_VM_FILE_MAGIC)
        return -EINVAL;

    v = qemu_get_be32(f);
J
Juan Quintela 已提交
1442 1443 1444 1445
    if (v == QEMU_VM_FILE_VERSION_COMPAT) {
        fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
        return -ENOTSUP;
    }
A
aliguori 已提交
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487
    if (v != QEMU_VM_FILE_VERSION)
        return -ENOTSUP;

    while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
        uint32_t instance_id, version_id, section_id;
        SaveStateEntry *se;
        char idstr[257];
        int len;

        switch (section_type) {
        case QEMU_VM_SECTION_START:
        case QEMU_VM_SECTION_FULL:
            /* Read section start */
            section_id = qemu_get_be32(f);
            len = qemu_get_byte(f);
            qemu_get_buffer(f, (uint8_t *)idstr, len);
            idstr[len] = 0;
            instance_id = qemu_get_be32(f);
            version_id = qemu_get_be32(f);

            /* Find savevm section */
            se = find_se(idstr, instance_id);
            if (se == NULL) {
                fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
                ret = -EINVAL;
                goto out;
            }

            /* Validate version */
            if (version_id > se->version_id) {
                fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
                        version_id, idstr, se->version_id);
                ret = -EINVAL;
                goto out;
            }

            /* Add entry */
            le = qemu_mallocz(sizeof(*le));

            le->se = se;
            le->section_id = section_id;
            le->version_id = version_id;
B
Blue Swirl 已提交
1488
            QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
A
aliguori 已提交
1489

1490
            ret = vmstate_load(f, le->se, le->version_id);
1491 1492 1493 1494 1495
            if (ret < 0) {
                fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
                        instance_id, idstr);
                goto out;
            }
A
aliguori 已提交
1496 1497 1498 1499 1500
            break;
        case QEMU_VM_SECTION_PART:
        case QEMU_VM_SECTION_END:
            section_id = qemu_get_be32(f);

B
Blue Swirl 已提交
1501
            QLIST_FOREACH(le, &loadvm_handlers, entry) {
1502 1503 1504 1505
                if (le->section_id == section_id) {
                    break;
                }
            }
A
aliguori 已提交
1506 1507 1508 1509 1510 1511
            if (le == NULL) {
                fprintf(stderr, "Unknown savevm section %d\n", section_id);
                ret = -EINVAL;
                goto out;
            }

1512
            ret = vmstate_load(f, le->se, le->version_id);
1513 1514 1515 1516 1517
            if (ret < 0) {
                fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
                        section_id);
                goto out;
            }
A
aliguori 已提交
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528
            break;
        default:
            fprintf(stderr, "Unknown savevm section type %d\n", section_type);
            ret = -EINVAL;
            goto out;
        }
    }

    ret = 0;

out:
B
Blue Swirl 已提交
1529 1530
    QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
        QLIST_REMOVE(le, entry);
A
aliguori 已提交
1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558
        qemu_free(le);
    }

    if (qemu_file_has_error(f))
        ret = -EIO;

    return ret;
}

/* device can contain snapshots */
static int bdrv_can_snapshot(BlockDriverState *bs)
{
    return (bs &&
            !bdrv_is_removable(bs) &&
            !bdrv_is_read_only(bs));
}

/* device must be snapshots in order to have a reliable snapshot */
static int bdrv_has_snapshot(BlockDriverState *bs)
{
    return (bs &&
            !bdrv_is_removable(bs) &&
            !bdrv_is_read_only(bs));
}

static BlockDriverState *get_bs_snapshots(void)
{
    BlockDriverState *bs;
G
Gerd Hoffmann 已提交
1559
    DriveInfo *dinfo;
A
aliguori 已提交
1560 1561 1562

    if (bs_snapshots)
        return bs_snapshots;
B
Blue Swirl 已提交
1563
    QTAILQ_FOREACH(dinfo, &drives, next) {
G
Gerd Hoffmann 已提交
1564
        bs = dinfo->bdrv;
A
aliguori 已提交
1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
        if (bdrv_can_snapshot(bs))
            goto ok;
    }
    return NULL;
 ok:
    bs_snapshots = bs;
    return bs;
}

static int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
                              const char *name)
{
    QEMUSnapshotInfo *sn_tab, *sn;
    int nb_sns, i, ret;

    ret = -ENOENT;
    nb_sns = bdrv_snapshot_list(bs, &sn_tab);
    if (nb_sns < 0)
        return ret;
    for(i = 0; i < nb_sns; i++) {
        sn = &sn_tab[i];
        if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) {
            *sn_info = *sn;
            ret = 0;
            break;
        }
    }
    qemu_free(sn_tab);
    return ret;
}

1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
/*
 * Deletes snapshots of a given name in all opened images.
 */
static int del_existing_snapshots(Monitor *mon, const char *name)
{
    BlockDriverState *bs;
    DriveInfo *dinfo;
    QEMUSnapshotInfo sn1, *snapshot = &sn1;
    int ret;

    QTAILQ_FOREACH(dinfo, &drives, next) {
        bs = dinfo->bdrv;
        if (bdrv_can_snapshot(bs) &&
            bdrv_snapshot_find(bs, snapshot, name) >= 0)
        {
            ret = bdrv_snapshot_delete(bs, name);
            if (ret < 0) {
                monitor_printf(mon,
                               "Error while deleting snapshot on '%s'\n",
                               bdrv_get_device_name(bs));
                return -1;
            }
        }
    }

    return 0;
}

1624
void do_savevm(Monitor *mon, const QDict *qdict)
A
aliguori 已提交
1625
{
G
Gerd Hoffmann 已提交
1626
    DriveInfo *dinfo;
A
aliguori 已提交
1627 1628
    BlockDriverState *bs, *bs1;
    QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1629
    int ret;
A
aliguori 已提交
1630 1631
    QEMUFile *f;
    int saved_vm_running;
1632
    uint32_t vm_state_size;
A
aliguori 已提交
1633 1634 1635 1636 1637
#ifdef _WIN32
    struct _timeb tb;
#else
    struct timeval tv;
#endif
1638
    const char *name = qdict_get_try_str(qdict, "name");
A
aliguori 已提交
1639 1640 1641

    bs = get_bs_snapshots();
    if (!bs) {
A
aliguori 已提交
1642
        monitor_printf(mon, "No block device can accept snapshots\n");
A
aliguori 已提交
1643 1644 1645 1646 1647 1648 1649 1650 1651
        return;
    }

    /* ??? Should this occur after vm_stop?  */
    qemu_aio_flush();

    saved_vm_running = vm_running;
    vm_stop(0);

1652
    memset(sn, 0, sizeof(*sn));
A
aliguori 已提交
1653 1654 1655
    if (name) {
        ret = bdrv_snapshot_find(bs, old_sn, name);
        if (ret >= 0) {
1656 1657 1658
            pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
            pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
        } else {
A
aliguori 已提交
1659
            pstrcpy(sn->name, sizeof(sn->name), name);
1660
        }
A
aliguori 已提交
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
    }

    /* fill auxiliary fields */
#ifdef _WIN32
    _ftime(&tb);
    sn->date_sec = tb.time;
    sn->date_nsec = tb.millitm * 1000000;
#else
    gettimeofday(&tv, NULL);
    sn->date_sec = tv.tv_sec;
    sn->date_nsec = tv.tv_usec * 1000;
#endif
    sn->vm_clock_nsec = qemu_get_clock(vm_clock);

1675 1676 1677 1678 1679
    /* Delete old snapshots of the same name */
    if (del_existing_snapshots(mon, name) < 0) {
        goto the_end;
    }

A
aliguori 已提交
1680
    /* save the VM state */
1681
    f = qemu_fopen_bdrv(bs, 1);
A
aliguori 已提交
1682
    if (!f) {
A
aliguori 已提交
1683
        monitor_printf(mon, "Could not open VM state file\n");
A
aliguori 已提交
1684 1685 1686
        goto the_end;
    }
    ret = qemu_savevm_state(f);
1687
    vm_state_size = qemu_ftell(f);
A
aliguori 已提交
1688 1689
    qemu_fclose(f);
    if (ret < 0) {
A
aliguori 已提交
1690
        monitor_printf(mon, "Error %d while writing VM\n", ret);
A
aliguori 已提交
1691 1692 1693 1694 1695
        goto the_end;
    }

    /* create the snapshots */

B
Blue Swirl 已提交
1696
    QTAILQ_FOREACH(dinfo, &drives, next) {
G
Gerd Hoffmann 已提交
1697
        bs1 = dinfo->bdrv;
A
aliguori 已提交
1698
        if (bdrv_has_snapshot(bs1)) {
1699 1700
            /* Write VM state size only to the image that contains the state */
            sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
A
aliguori 已提交
1701 1702
            ret = bdrv_snapshot_create(bs1, sn);
            if (ret < 0) {
A
aliguori 已提交
1703 1704
                monitor_printf(mon, "Error while creating snapshot on '%s'\n",
                               bdrv_get_device_name(bs1));
A
aliguori 已提交
1705 1706 1707 1708 1709 1710 1711 1712 1713
            }
        }
    }

 the_end:
    if (saved_vm_running)
        vm_start();
}

1714
int load_vmstate(Monitor *mon, const char *name)
A
aliguori 已提交
1715
{
G
Gerd Hoffmann 已提交
1716
    DriveInfo *dinfo;
A
aliguori 已提交
1717
    BlockDriverState *bs, *bs1;
1718
    QEMUSnapshotInfo sn;
A
aliguori 已提交
1719
    QEMUFile *f;
G
Gerd Hoffmann 已提交
1720
    int ret;
A
aliguori 已提交
1721 1722 1723

    bs = get_bs_snapshots();
    if (!bs) {
A
aliguori 已提交
1724
        monitor_printf(mon, "No block device supports snapshots\n");
1725
        return -EINVAL;
A
aliguori 已提交
1726 1727 1728 1729 1730
    }

    /* Flush all IO requests so they don't interfere with the new state.  */
    qemu_aio_flush();

B
Blue Swirl 已提交
1731
    QTAILQ_FOREACH(dinfo, &drives, next) {
G
Gerd Hoffmann 已提交
1732
        bs1 = dinfo->bdrv;
A
aliguori 已提交
1733 1734 1735 1736
        if (bdrv_has_snapshot(bs1)) {
            ret = bdrv_snapshot_goto(bs1, name);
            if (ret < 0) {
                if (bs != bs1)
A
aliguori 已提交
1737
                    monitor_printf(mon, "Warning: ");
A
aliguori 已提交
1738 1739
                switch(ret) {
                case -ENOTSUP:
A
aliguori 已提交
1740 1741 1742
                    monitor_printf(mon,
                                   "Snapshots not supported on device '%s'\n",
                                   bdrv_get_device_name(bs1));
A
aliguori 已提交
1743 1744
                    break;
                case -ENOENT:
A
aliguori 已提交
1745 1746 1747
                    monitor_printf(mon, "Could not find snapshot '%s' on "
                                   "device '%s'\n",
                                   name, bdrv_get_device_name(bs1));
A
aliguori 已提交
1748 1749
                    break;
                default:
A
aliguori 已提交
1750 1751
                    monitor_printf(mon, "Error %d while activating snapshot on"
                                   " '%s'\n", ret, bdrv_get_device_name(bs1));
A
aliguori 已提交
1752 1753 1754 1755
                    break;
                }
                /* fatal on snapshot block device */
                if (bs == bs1)
1756
                    return 0;
A
aliguori 已提交
1757 1758 1759 1760
            }
        }
    }

1761 1762 1763
    /* Don't even try to load empty VM states */
    ret = bdrv_snapshot_find(bs, &sn, name);
    if ((ret >= 0) && (sn.vm_state_size == 0))
1764
        return -EINVAL;
1765

A
aliguori 已提交
1766
    /* restore the VM state */
1767
    f = qemu_fopen_bdrv(bs, 0);
A
aliguori 已提交
1768
    if (!f) {
A
aliguori 已提交
1769
        monitor_printf(mon, "Could not open VM state file\n");
1770
        return -EINVAL;
A
aliguori 已提交
1771 1772 1773 1774
    }
    ret = qemu_loadvm_state(f);
    qemu_fclose(f);
    if (ret < 0) {
A
aliguori 已提交
1775
        monitor_printf(mon, "Error %d while loading VM state\n", ret);
1776
        return ret;
A
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1777
    }
1778
    return 0;
1779 1780
}

1781
void do_delvm(Monitor *mon, const QDict *qdict)
A
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1782
{
G
Gerd Hoffmann 已提交
1783
    DriveInfo *dinfo;
A
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1784
    BlockDriverState *bs, *bs1;
G
Gerd Hoffmann 已提交
1785
    int ret;
1786
    const char *name = qdict_get_str(qdict, "name");
A
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1787 1788 1789

    bs = get_bs_snapshots();
    if (!bs) {
A
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1790
        monitor_printf(mon, "No block device supports snapshots\n");
A
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1791 1792 1793
        return;
    }

B
Blue Swirl 已提交
1794
    QTAILQ_FOREACH(dinfo, &drives, next) {
G
Gerd Hoffmann 已提交
1795
        bs1 = dinfo->bdrv;
A
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1796 1797 1798 1799
        if (bdrv_has_snapshot(bs1)) {
            ret = bdrv_snapshot_delete(bs1, name);
            if (ret < 0) {
                if (ret == -ENOTSUP)
A
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1800 1801 1802
                    monitor_printf(mon,
                                   "Snapshots not supported on device '%s'\n",
                                   bdrv_get_device_name(bs1));
A
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1803
                else
A
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1804 1805
                    monitor_printf(mon, "Error %d while deleting snapshot on "
                                   "'%s'\n", ret, bdrv_get_device_name(bs1));
A
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1806 1807 1808 1809 1810
            }
        }
    }
}

A
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1811
void do_info_snapshots(Monitor *mon)
A
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1812
{
G
Gerd Hoffmann 已提交
1813
    DriveInfo *dinfo;
A
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1814 1815 1816 1817 1818 1819 1820
    BlockDriverState *bs, *bs1;
    QEMUSnapshotInfo *sn_tab, *sn;
    int nb_sns, i;
    char buf[256];

    bs = get_bs_snapshots();
    if (!bs) {
A
aliguori 已提交
1821
        monitor_printf(mon, "No available block device supports snapshots\n");
A
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1822 1823
        return;
    }
A
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1824
    monitor_printf(mon, "Snapshot devices:");
B
Blue Swirl 已提交
1825
    QTAILQ_FOREACH(dinfo, &drives, next) {
G
Gerd Hoffmann 已提交
1826
        bs1 = dinfo->bdrv;
A
aliguori 已提交
1827 1828
        if (bdrv_has_snapshot(bs1)) {
            if (bs == bs1)
A
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1829
                monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
A
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1830 1831
        }
    }
A
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1832
    monitor_printf(mon, "\n");
A
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1833 1834 1835

    nb_sns = bdrv_snapshot_list(bs, &sn_tab);
    if (nb_sns < 0) {
A
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1836
        monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
A
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1837 1838
        return;
    }
A
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1839 1840 1841
    monitor_printf(mon, "Snapshot list (from %s):\n",
                   bdrv_get_device_name(bs));
    monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
A
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1842 1843
    for(i = 0; i < nb_sns; i++) {
        sn = &sn_tab[i];
A
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1844
        monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
A
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1845 1846 1847
    }
    qemu_free(sn_tab);
}