savevm.c 31.0 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 HOST_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>
#if defined(__NetBSD__)
#include <net/if_tap.h>
#endif
#ifdef __linux__
#include <linux/if_tun.h>
#endif
#include <arpa/inet.h>
#include <dirent.h>
#include <netdb.h>
#include <sys/select.h>
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#ifdef HOST_BSD
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#include <sys/stat.h>
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#if defined(__FreeBSD__) || defined(__DragonFly__)
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#include <libutil.h>
#else
#include <util.h>
#endif
#elif defined (__GLIBC__) && defined (__FreeBSD_kernel__)
#include <freebsd/stdlib.h>
#else
#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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/* point to the block driver where the snapshots are managed */
static BlockDriverState *bs_snapshots;

#define SELF_ANNOUNCE_ROUNDS 5
#define ETH_P_EXPERIMENTAL 0x01F1 /* just a number */
//#define ETH_P_EXPERIMENTAL 0x0012 /* make it the size of the packet */
#define EXPERIMENTAL_MAGIC 0xf1f23f4f

static int announce_self_create(uint8_t *buf, 
				uint8_t *mac_addr)
{
    uint32_t magic = EXPERIMENTAL_MAGIC;
    uint16_t proto = htons(ETH_P_EXPERIMENTAL);

    /* FIXME: should we send a different packet (arp/rarp/ping)? */

    memset(buf, 0xff, 6);         /* h_dst */
    memcpy(buf + 6, mac_addr, 6); /* h_src */
    memcpy(buf + 12, &proto, 2);  /* h_proto */
    memcpy(buf + 14, &magic, 4);  /* magic */

    return 18; /* len */
}

void qemu_announce_self(void)
{
    int i, j, len;
    VLANState *vlan;
    VLANClientState *vc;
    uint8_t buf[256];

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    for (i = 0; i < MAX_NICS; i++) {
        if (!nd_table[i].used)
            continue;
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        len = announce_self_create(buf, nd_table[i].macaddr);
        vlan = nd_table[i].vlan;
        for(vc = vlan->first_client; vc != NULL; vc = vc->next) {
            for (j=0; j < SELF_ANNOUNCE_ROUNDS; j++)
                vc->fd_read(vc->opaque, buf, len);
        }
    }
}

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

#define IO_BUF_SIZE 32768

struct QEMUFile {
    QEMUFilePutBufferFunc *put_buffer;
    QEMUFileGetBufferFunc *get_buffer;
    QEMUFileCloseFunc *close;
    QEMUFileRateLimit *rate_limit;
    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;
};

typedef struct QEMUFilePopen
{
    FILE *popen_file;
    QEMUFile *file;
} QEMUFilePopen;

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 {
        len = recv(s->fd, buf, size, 0);
    } 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;
}

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

static int popen_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
{
    QEMUFilePopen *s = opaque;
    return fread(buf, 1, size, s->popen_file);
}

static int popen_close(void *opaque)
{
    QEMUFilePopen *s = opaque;
    pclose(s->popen_file);
    qemu_free(s);
    return 0;
}

QEMUFile *qemu_popen(FILE *popen_file, const char *mode)
{
    QEMUFilePopen *s;

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

    s = qemu_mallocz(sizeof(QEMUFilePopen));

    s->popen_file = popen_file;

    if(mode[0] == 'r') {
        s->file = qemu_fopen_ops(s, NULL, popen_get_buffer, popen_close, NULL);
    } else {
        s->file = qemu_fopen_ops(s, popen_put_buffer, NULL, popen_close, NULL);
    }
    fprintf(stderr, "qemu_popen: returning result of qemu_fopen_ops\n");
    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);
}

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

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

typedef struct QEMUFileStdio
{
    FILE *outfile;
} QEMUFileStdio;

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

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

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

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

    s = qemu_mallocz(sizeof(QEMUFileStdio));

    s->outfile = fopen(filename, mode);
    if (!s->outfile)
        goto fail;

    if (!strcmp(mode, "wb"))
        return qemu_fopen_ops(s, file_put_buffer, NULL, file_close, NULL);
    else if (!strcmp(mode, "rb"))
        return qemu_fopen_ops(s, NULL, file_get_buffer, file_close, NULL);

fail:
    if (s->outfile)
        fclose(s->outfile);
    qemu_free(s);
    return NULL;
}

typedef struct QEMUFileBdrv
{
    BlockDriverState *bs;
    int64_t base_offset;
} QEMUFileBdrv;

static int bdrv_put_buffer(void *opaque, const uint8_t *buf,
                           int64_t pos, int size)
{
    QEMUFileBdrv *s = opaque;
    bdrv_pwrite(s->bs, s->base_offset + pos, buf, size);
    return size;
}

static int bdrv_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
{
    QEMUFileBdrv *s = opaque;
    return bdrv_pread(s->bs, s->base_offset + pos, buf, size);
}

static int bdrv_fclose(void *opaque)
{
    QEMUFileBdrv *s = opaque;
    qemu_free(s);
    return 0;
}

static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int64_t offset, int is_writable)
{
    QEMUFileBdrv *s;

    s = qemu_mallocz(sizeof(QEMUFileBdrv));

    s->bs = bs;
    s->base_offset = offset;

    if (is_writable)
        return qemu_fopen_ops(s, bdrv_put_buffer, NULL, bdrv_fclose, NULL);

    return qemu_fopen_ops(s, NULL, bdrv_get_buffer, bdrv_fclose, NULL);
}

QEMUFile *qemu_fopen_ops(void *opaque, QEMUFilePutBufferFunc *put_buffer,
                         QEMUFileGetBufferFunc *get_buffer,
                         QEMUFileCloseFunc *close,
                         QEMUFileRateLimit *rate_limit)
{
    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;
    f->is_write = 0;

    return f;
}

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

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;
}

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;
}

typedef struct SaveStateEntry {
    char idstr[256];
    int instance_id;
    int version_id;
    int section_id;
    SaveLiveStateHandler *save_live_state;
    SaveStateHandler *save_state;
    LoadStateHandler *load_state;
    void *opaque;
    struct SaveStateEntry *next;
} SaveStateEntry;

static SaveStateEntry *first_se;

/* 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,
                         SaveLiveStateHandler *save_live_state,
                         SaveStateHandler *save_state,
                         LoadStateHandler *load_state,
                         void *opaque)
{
    SaveStateEntry *se, **pse;
    static int global_section_id;

    se = qemu_malloc(sizeof(SaveStateEntry));
    pstrcpy(se->idstr, sizeof(se->idstr), idstr);
    se->instance_id = (instance_id == -1) ? 0 : instance_id;
    se->version_id = version_id;
    se->section_id = global_section_id++;
    se->save_live_state = save_live_state;
    se->save_state = save_state;
    se->load_state = load_state;
    se->opaque = opaque;
    se->next = NULL;

    /* add at the end of list */
    pse = &first_se;
    while (*pse != NULL) {
        if (instance_id == -1
                && strcmp(se->idstr, (*pse)->idstr) == 0
                && se->instance_id <= (*pse)->instance_id)
            se->instance_id = (*pse)->instance_id + 1;
        pse = &(*pse)->next;
    }
    *pse = se;
    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,
                                NULL, save_state, load_state, opaque);
}

#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

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

    qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
    qemu_put_be32(f, QEMU_VM_FILE_VERSION);

    for (se = first_se; se != NULL; se = se->next) {
        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;

    for (se = first_se; se != NULL; se = se->next) {
        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;

    for (se = first_se; se != NULL; se = se->next) {
        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);
    }

    for(se = first_se; se != NULL; se = se->next) {
        int len;

	if (se->save_state == NULL)
	    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);

        se->save_state(f, se->opaque);
    }

    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();

    ret = qemu_savevm_state_begin(f);
    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;

    for(se = first_se; se != NULL; se = se->next) {
        if (!strcmp(se->idstr, idstr) &&
            instance_id == se->instance_id)
            return se;
    }
    return NULL;
}

typedef struct LoadStateEntry {
    SaveStateEntry *se;
    int section_id;
    int version_id;
    struct LoadStateEntry *next;
} LoadStateEntry;

static int qemu_loadvm_state_v2(QEMUFile *f)
{
    SaveStateEntry *se;
    int len, ret, instance_id, record_len, version_id;
    int64_t total_len, end_pos, cur_pos;
    char idstr[256];

    total_len = qemu_get_be64(f);
    end_pos = total_len + qemu_ftell(f);
    for(;;) {
        if (qemu_ftell(f) >= end_pos)
            break;
        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);
        record_len = qemu_get_be32(f);
        cur_pos = qemu_ftell(f);
        se = find_se(idstr, instance_id);
        if (!se) {
            fprintf(stderr, "qemu: warning: instance 0x%x of device '%s' not present in current VM\n",
                    instance_id, idstr);
        } else {
            ret = se->load_state(f, se->opaque, version_id);
            if (ret < 0) {
                fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
                        instance_id, idstr);
            }
        }
        /* always seek to exact end of record */
        qemu_fseek(f, cur_pos + record_len, SEEK_SET);
    }

    if (qemu_file_has_error(f))
        return -EIO;

    return 0;
}

int qemu_loadvm_state(QEMUFile *f)
{
    LoadStateEntry *first_le = NULL;
    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);
    if (v == QEMU_VM_FILE_VERSION_COMPAT)
        return qemu_loadvm_state_v2(f);
    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;
        LoadStateEntry *le;
        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;
            le->next = first_le;
            first_le = le;

            le->se->load_state(f, le->se->opaque, le->version_id);
            break;
        case QEMU_VM_SECTION_PART:
        case QEMU_VM_SECTION_END:
            section_id = qemu_get_be32(f);

            for (le = first_le; le && le->section_id != section_id; le = le->next);
            if (le == NULL) {
                fprintf(stderr, "Unknown savevm section %d\n", section_id);
                ret = -EINVAL;
                goto out;
            }

            le->se->load_state(f, le->se->opaque, le->version_id);
            break;
        default:
            fprintf(stderr, "Unknown savevm section type %d\n", section_type);
            ret = -EINVAL;
            goto out;
        }
    }

    ret = 0;

out:
    while (first_le) {
        LoadStateEntry *le = first_le;
        first_le = first_le->next;
        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;
    int i;

    if (bs_snapshots)
        return bs_snapshots;
    for(i = 0; i <= nb_drives; i++) {
        bs = drives_table[i].bdrv;
        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;
}

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void do_savevm(Monitor *mon, const char *name)
A
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{
    BlockDriverState *bs, *bs1;
    QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
    int must_delete, ret, i;
    BlockDriverInfo bdi1, *bdi = &bdi1;
    QEMUFile *f;
    int saved_vm_running;
1010
    uint32_t vm_state_size;
A
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#ifdef _WIN32
    struct _timeb tb;
#else
    struct timeval tv;
#endif

    bs = get_bs_snapshots();
    if (!bs) {
A
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        monitor_printf(mon, "No block device can accept snapshots\n");
A
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1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057
        return;
    }

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

    saved_vm_running = vm_running;
    vm_stop(0);

    must_delete = 0;
    if (name) {
        ret = bdrv_snapshot_find(bs, old_sn, name);
        if (ret >= 0) {
            must_delete = 1;
        }
    }
    memset(sn, 0, sizeof(*sn));
    if (must_delete) {
        pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
        pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
    } else {
        if (name)
            pstrcpy(sn->name, sizeof(sn->name), name);
    }

    /* 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);

    if (bdrv_get_info(bs, bdi) < 0 || bdi->vm_state_offset <= 0) {
A
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        monitor_printf(mon, "Device %s does not support VM state snapshots\n",
                       bdrv_get_device_name(bs));
A
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1060 1061 1062 1063 1064 1065
        goto the_end;
    }

    /* save the VM state */
    f = qemu_fopen_bdrv(bs, bdi->vm_state_offset, 1);
    if (!f) {
A
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        monitor_printf(mon, "Could not open VM state file\n");
A
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        goto the_end;
    }
    ret = qemu_savevm_state(f);
1070
    vm_state_size = qemu_ftell(f);
A
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1071 1072
    qemu_fclose(f);
    if (ret < 0) {
A
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1073
        monitor_printf(mon, "Error %d while writing VM\n", ret);
A
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1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
        goto the_end;
    }

    /* create the snapshots */

    for(i = 0; i < nb_drives; i++) {
        bs1 = drives_table[i].bdrv;
        if (bdrv_has_snapshot(bs1)) {
            if (must_delete) {
                ret = bdrv_snapshot_delete(bs1, old_sn->id_str);
                if (ret < 0) {
A
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                    monitor_printf(mon,
                                   "Error while deleting snapshot on '%s'\n",
                                   bdrv_get_device_name(bs1));
A
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                }
            }
1090 1091
            /* Write VM state size only to the image that contains the state */
            sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
A
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            ret = bdrv_snapshot_create(bs1, sn);
            if (ret < 0) {
A
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                monitor_printf(mon, "Error while creating snapshot on '%s'\n",
                               bdrv_get_device_name(bs1));
A
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1096 1097 1098 1099 1100 1101 1102 1103 1104
            }
        }
    }

 the_end:
    if (saved_vm_running)
        vm_start();
}

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void do_loadvm(Monitor *mon, const char *name)
A
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{
    BlockDriverState *bs, *bs1;
    BlockDriverInfo bdi1, *bdi = &bdi1;
1109
    QEMUSnapshotInfo sn;
A
aliguori 已提交
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    QEMUFile *f;
    int i, ret;
    int saved_vm_running;

    bs = get_bs_snapshots();
    if (!bs) {
A
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1116
        monitor_printf(mon, "No block device supports snapshots\n");
A
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1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
        return;
    }

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

    saved_vm_running = vm_running;
    vm_stop(0);

    for(i = 0; i <= nb_drives; i++) {
        bs1 = drives_table[i].bdrv;
        if (bdrv_has_snapshot(bs1)) {
            ret = bdrv_snapshot_goto(bs1, name);
            if (ret < 0) {
                if (bs != bs1)
A
aliguori 已提交
1132
                    monitor_printf(mon, "Warning: ");
A
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1133 1134
                switch(ret) {
                case -ENOTSUP:
A
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1135 1136 1137
                    monitor_printf(mon,
                                   "Snapshots not supported on device '%s'\n",
                                   bdrv_get_device_name(bs1));
A
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1138 1139
                    break;
                case -ENOENT:
A
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1140 1141 1142
                    monitor_printf(mon, "Could not find snapshot '%s' on "
                                   "device '%s'\n",
                                   name, bdrv_get_device_name(bs1));
A
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                    break;
                default:
A
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1145 1146
                    monitor_printf(mon, "Error %d while activating snapshot on"
                                   " '%s'\n", ret, bdrv_get_device_name(bs1));
A
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1147 1148 1149 1150 1151 1152 1153 1154 1155 1156
                    break;
                }
                /* fatal on snapshot block device */
                if (bs == bs1)
                    goto the_end;
            }
        }
    }

    if (bdrv_get_info(bs, bdi) < 0 || bdi->vm_state_offset <= 0) {
A
aliguori 已提交
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        monitor_printf(mon, "Device %s does not support VM state snapshots\n",
                       bdrv_get_device_name(bs));
A
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1159 1160 1161
        return;
    }

1162 1163 1164 1165 1166
    /* Don't even try to load empty VM states */
    ret = bdrv_snapshot_find(bs, &sn, name);
    if ((ret >= 0) && (sn.vm_state_size == 0))
        goto the_end;

A
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1167 1168 1169
    /* restore the VM state */
    f = qemu_fopen_bdrv(bs, bdi->vm_state_offset, 0);
    if (!f) {
A
aliguori 已提交
1170
        monitor_printf(mon, "Could not open VM state file\n");
A
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1171 1172 1173 1174 1175
        goto the_end;
    }
    ret = qemu_loadvm_state(f);
    qemu_fclose(f);
    if (ret < 0) {
A
aliguori 已提交
1176
        monitor_printf(mon, "Error %d while loading VM state\n", ret);
A
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1177 1178 1179 1180 1181 1182
    }
 the_end:
    if (saved_vm_running)
        vm_start();
}

A
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1183
void do_delvm(Monitor *mon, const char *name)
A
aliguori 已提交
1184 1185 1186 1187 1188 1189
{
    BlockDriverState *bs, *bs1;
    int i, ret;

    bs = get_bs_snapshots();
    if (!bs) {
A
aliguori 已提交
1190
        monitor_printf(mon, "No block device supports snapshots\n");
A
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1191 1192 1193 1194 1195 1196 1197 1198 1199
        return;
    }

    for(i = 0; i <= nb_drives; i++) {
        bs1 = drives_table[i].bdrv;
        if (bdrv_has_snapshot(bs1)) {
            ret = bdrv_snapshot_delete(bs1, name);
            if (ret < 0) {
                if (ret == -ENOTSUP)
A
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1200 1201 1202
                    monitor_printf(mon,
                                   "Snapshots not supported on device '%s'\n",
                                   bdrv_get_device_name(bs1));
A
aliguori 已提交
1203
                else
A
aliguori 已提交
1204 1205
                    monitor_printf(mon, "Error %d while deleting snapshot on "
                                   "'%s'\n", ret, bdrv_get_device_name(bs1));
A
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1206 1207 1208 1209 1210
            }
        }
    }
}

A
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1211
void do_info_snapshots(Monitor *mon)
A
aliguori 已提交
1212 1213 1214 1215 1216 1217 1218 1219
{
    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
1220
        monitor_printf(mon, "No available block device supports snapshots\n");
A
aliguori 已提交
1221 1222
        return;
    }
A
aliguori 已提交
1223
    monitor_printf(mon, "Snapshot devices:");
A
aliguori 已提交
1224 1225 1226 1227
    for(i = 0; i <= nb_drives; i++) {
        bs1 = drives_table[i].bdrv;
        if (bdrv_has_snapshot(bs1)) {
            if (bs == bs1)
A
aliguori 已提交
1228
                monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
A
aliguori 已提交
1229 1230
        }
    }
A
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1231
    monitor_printf(mon, "\n");
A
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1232 1233 1234

    nb_sns = bdrv_snapshot_list(bs, &sn_tab);
    if (nb_sns < 0) {
A
aliguori 已提交
1235
        monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
A
aliguori 已提交
1236 1237
        return;
    }
A
aliguori 已提交
1238 1239 1240
    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
aliguori 已提交
1241 1242
    for(i = 0; i < nb_sns; i++) {
        sn = &sn_tab[i];
A
aliguori 已提交
1243
        monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
A
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1244 1245 1246
    }
    qemu_free(sn_tab);
}