savevm.c 51.2 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"
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#include "hw/qdev.h"
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#include "net.h"
#include "monitor.h"
#include "sysemu.h"
#include "qemu-timer.h"
#include "qemu-char.h"
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#include "blockdev.h"
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#include "audio/audio.h"
#include "migration.h"
#include "qemu_socket.h"
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#include "qemu-queue.h"
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#define SELF_ANNOUNCE_ROUNDS 5

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#ifndef ETH_P_RARP
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#define ETH_P_RARP 0x8035
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#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;
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    int ret;
    ret = pclose(s->stdio_file);
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    qemu_free(s);
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    return ret;
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}

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);
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    return fwrite(buf, 1, size, s->stdio_file);
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}

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) {
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        fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
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        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;
}

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static int qemu_peek_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];
}

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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)
{
624 625 626
    /* 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;
}

687
static void put_int8(QEMUFile *f, void *pv, size_t size)
688
{
689
    int8_t *v = pv;
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    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;
}

708
static void put_int16(QEMUFile *f, void *pv, size_t size)
709
{
710
    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;
}

729
static void put_int32(QEMUFile *f, void *pv, size_t size)
730
{
731
    int32_t *v = pv;
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    qemu_put_sbe32s(f, v);
}

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

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/* 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,
};

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/* 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,
};

781 782 783 784 785 786 787 788 789
/* 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;
}

790
static void put_int64(QEMUFile *f, void *pv, size_t size)
791
{
792
    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;
}

811
static void put_uint8(QEMUFile *f, void *pv, size_t size)
812
{
813
    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;
}

832
static void put_uint16(QEMUFile *f, void *pv, size_t size)
833
{
834
    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;
}

853
static void put_uint32(QEMUFile *f, void *pv, size_t size)
854
{
855
    uint32_t *v = pv;
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873
    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;
}

874
static void put_uint64(QEMUFile *f, void *pv, size_t size)
875
{
876
    uint64_t *v = pv;
877 878 879 880 881 882 883 884 885
    qemu_put_be64s(f, v);
}

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

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/* 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;
}

935
static void put_timer(QEMUFile *f, void *pv, size_t size)
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{
937
    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,
};

947 948 949 950 951 952 953 954 955
/* 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;
}

956
static void put_buffer(QEMUFile *f, void *pv, size_t size)
957
{
958
    uint8_t *v = pv;
959 960 961 962 963 964 965 966 967
    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 CompatEntry {
    char idstr[256];
    int instance_id;
} CompatEntry;

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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;
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    int alias_id;
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    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;
1018
    const VMStateDescription *vmsd;
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    void *opaque;
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    CompatEntry *compat;
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} SaveStateEntry;

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static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
    QTAILQ_HEAD_INITIALIZER(savevm_handlers);
1026
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) {
1034 1035 1036 1037 1038 1039 1040 1041
        if (strcmp(idstr, se->idstr) == 0
            && instance_id <= se->instance_id) {
            instance_id = se->instance_id + 1;
        }
    }
    return instance_id;
}

1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
static int calculate_compat_instance_id(const char *idstr)
{
    SaveStateEntry *se;
    int instance_id = 0;

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
        if (!se->compat)
            continue;

        if (strcmp(idstr, se->compat->idstr) == 0
            && instance_id <= se->compat->instance_id) {
            instance_id = se->compat->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. */
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int register_savevm_live(DeviceState *dev,
                         const char *idstr,
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                         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)
{
1073
    SaveStateEntry *se;
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    se = qemu_mallocz(sizeof(SaveStateEntry));
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    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;
1083
    se->vmsd = NULL;
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1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
    if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
        char *id = dev->parent_bus->info->get_dev_path(dev);
        if (id) {
            pstrcpy(se->idstr, sizeof(se->idstr), id);
            pstrcat(se->idstr, sizeof(se->idstr), "/");
            qemu_free(id);

            se->compat = qemu_mallocz(sizeof(CompatEntry));
            pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
            se->compat->instance_id = instance_id == -1 ?
                         calculate_compat_instance_id(idstr) : instance_id;
            instance_id = -1;
        }
    }
    pstrcat(se->idstr, sizeof(se->idstr), idstr);

1101
    if (instance_id == -1) {
1102
        se->instance_id = calculate_new_instance_id(se->idstr);
1103 1104
    } else {
        se->instance_id = instance_id;
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    }
1106
    assert(!se->compat || se->instance_id == 0);
1107
    /* add at the end of list */
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    QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
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    return 0;
}

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

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void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
1125
{
1126
    SaveStateEntry *se, *new_se;
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
    char id[256] = "";

    if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
        char *path = dev->parent_bus->info->get_dev_path(dev);
        if (path) {
            pstrcpy(id, sizeof(id), path);
            pstrcat(id, sizeof(id), "/");
            qemu_free(path);
        }
    }
    pstrcat(id, sizeof(id), idstr);
1138

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    QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1140
        if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
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            QTAILQ_REMOVE(&savevm_handlers, se, entry);
1142
            qemu_free(se);
1143 1144 1145 1146
        }
    }
}

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int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
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                                   const VMStateDescription *vmsd,
                                   void *opaque, int alias_id,
                                   int required_for_version)
1151
{
1152
    SaveStateEntry *se;
1153

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    /* If this triggers, alias support can be dropped for the vmsd. */
    assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);

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    se = qemu_mallocz(sizeof(SaveStateEntry));
1158 1159 1160 1161 1162 1163 1164
    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;
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    se->alias_id = alias_id;
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1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
    if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
        char *id = dev->parent_bus->info->get_dev_path(dev);
        if (id) {
            pstrcpy(se->idstr, sizeof(se->idstr), id);
            pstrcat(se->idstr, sizeof(se->idstr), "/");
            qemu_free(id);

            se->compat = qemu_mallocz(sizeof(CompatEntry));
            pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name);
            se->compat->instance_id = instance_id == -1 ?
                         calculate_compat_instance_id(vmsd->name) : instance_id;
            instance_id = -1;
        }
    }
    pstrcat(se->idstr, sizeof(se->idstr), vmsd->name);

1183
    if (instance_id == -1) {
1184
        se->instance_id = calculate_new_instance_id(se->idstr);
1185 1186
    } else {
        se->instance_id = instance_id;
1187
    }
1188
    assert(!se->compat || se->instance_id == 0);
1189
    /* add at the end of list */
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    QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
1191 1192 1193
    return 0;
}

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int vmstate_register(DeviceState *dev, int instance_id,
                     const VMStateDescription *vmsd, void *opaque)
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{
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    return vmstate_register_with_alias_id(dev, instance_id, vmsd,
                                          opaque, -1, 0);
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}

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void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
                        void *opaque)
1203
{
1204 1205
    SaveStateEntry *se, *new_se;

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    QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
1207
        if (se->vmsd == vmsd && se->opaque == opaque) {
B
Blue Swirl 已提交
1208
            QTAILQ_REMOVE(&savevm_handlers, se, entry);
1209 1210 1211
            qemu_free(se);
        }
    }
1212 1213
}

J
Juan Quintela 已提交
1214 1215 1216 1217 1218
static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
                                    void *opaque);
static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
                                   void *opaque);

1219 1220 1221 1222
int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
                       void *opaque, int version_id)
{
    VMStateField *field = vmsd->fields;
J
Juan Quintela 已提交
1223
    int ret;
1224 1225 1226 1227 1228 1229 1230 1231 1232 1233

    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);
    }
J
Juan Quintela 已提交
1234 1235 1236 1237 1238
    if (vmsd->pre_load) {
        int ret = vmsd->pre_load(opaque);
        if (ret)
            return ret;
    }
1239
    while(field->name) {
1240 1241 1242 1243
        if ((field->field_exists &&
             field->field_exists(opaque, version_id)) ||
            (!field->field_exists &&
             field->version_id <= version_id)) {
J
Juan Quintela 已提交
1244
            void *base_addr = opaque + field->offset;
J
Juan Quintela 已提交
1245
            int i, n_elems = 1;
J
Juan Quintela 已提交
1246
            int size = field->size;
1247

J
Juan Quintela 已提交
1248 1249
            if (field->flags & VMS_VBUFFER) {
                size = *(int32_t *)(opaque+field->size_offset);
1250 1251 1252
                if (field->flags & VMS_MULTIPLY) {
                    size *= field->size;
                }
J
Juan Quintela 已提交
1253
            }
J
Juan Quintela 已提交
1254 1255
            if (field->flags & VMS_ARRAY) {
                n_elems = field->num;
1256 1257
            } else if (field->flags & VMS_VARRAY_INT32) {
                n_elems = *(int32_t *)(opaque+field->num_offset);
1258 1259
            } else if (field->flags & VMS_VARRAY_UINT16) {
                n_elems = *(uint16_t *)(opaque+field->num_offset);
J
Juan Quintela 已提交
1260
            }
J
Juan Quintela 已提交
1261
            if (field->flags & VMS_POINTER) {
J
Juan Quintela 已提交
1262
                base_addr = *(void **)base_addr + field->start;
J
Juan Quintela 已提交
1263
            }
J
Juan Quintela 已提交
1264
            for (i = 0; i < n_elems; i++) {
J
Juan Quintela 已提交
1265
                void *addr = base_addr + size * i;
J
Juan Quintela 已提交
1266

1267 1268 1269
                if (field->flags & VMS_ARRAY_OF_POINTER) {
                    addr = *(void **)addr;
                }
J
Juan Quintela 已提交
1270
                if (field->flags & VMS_STRUCT) {
1271
                    ret = vmstate_load_state(f, field->vmsd, addr, field->vmsd->version_id);
J
Juan Quintela 已提交
1272
                } else {
J
Juan Quintela 已提交
1273
                    ret = field->info->get(f, addr, size);
J
Juan Quintela 已提交
1274 1275

                }
J
Juan Quintela 已提交
1276 1277 1278
                if (ret < 0) {
                    return ret;
                }
1279 1280 1281 1282
            }
        }
        field++;
    }
J
Juan Quintela 已提交
1283 1284 1285 1286
    ret = vmstate_subsection_load(f, vmsd, opaque);
    if (ret != 0) {
        return ret;
    }
1287
    if (vmsd->post_load) {
1288
        return vmsd->post_load(opaque, version_id);
1289
    }
1290 1291 1292 1293
    return 0;
}

void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
1294
                        void *opaque)
1295 1296 1297
{
    VMStateField *field = vmsd->fields;

1298 1299 1300
    if (vmsd->pre_save) {
        vmsd->pre_save(opaque);
    }
1301
    while(field->name) {
1302 1303 1304 1305
        if (!field->field_exists ||
            field->field_exists(opaque, vmsd->version_id)) {
            void *base_addr = opaque + field->offset;
            int i, n_elems = 1;
J
Juan Quintela 已提交
1306
            int size = field->size;
J
Juan Quintela 已提交
1307

J
Juan Quintela 已提交
1308 1309
            if (field->flags & VMS_VBUFFER) {
                size = *(int32_t *)(opaque+field->size_offset);
1310 1311 1312
                if (field->flags & VMS_MULTIPLY) {
                    size *= field->size;
                }
J
Juan Quintela 已提交
1313
            }
1314 1315
            if (field->flags & VMS_ARRAY) {
                n_elems = field->num;
1316 1317
            } else if (field->flags & VMS_VARRAY_INT32) {
                n_elems = *(int32_t *)(opaque+field->num_offset);
1318 1319
            } else if (field->flags & VMS_VARRAY_UINT16) {
                n_elems = *(uint16_t *)(opaque+field->num_offset);
1320 1321
            }
            if (field->flags & VMS_POINTER) {
J
Juan Quintela 已提交
1322
                base_addr = *(void **)base_addr + field->start;
1323 1324
            }
            for (i = 0; i < n_elems; i++) {
J
Juan Quintela 已提交
1325
                void *addr = base_addr + size * i;
J
Juan Quintela 已提交
1326

1327 1328 1329
                if (field->flags & VMS_ARRAY_OF_POINTER) {
                    addr = *(void **)addr;
                }
1330 1331 1332
                if (field->flags & VMS_STRUCT) {
                    vmstate_save_state(f, field->vmsd, addr);
                } else {
J
Juan Quintela 已提交
1333
                    field->info->put(f, addr, size);
1334
                }
J
Juan Quintela 已提交
1335
            }
J
Juan Quintela 已提交
1336
        }
1337 1338
        field++;
    }
J
Juan Quintela 已提交
1339
    vmstate_subsection_save(f, vmsd, opaque);
1340 1341
}

1342 1343
static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
{
1344 1345 1346 1347
    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);
1348 1349 1350 1351
}

static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
{
1352 1353 1354 1355 1356
    if (!se->vmsd) {         /* Old style */
        se->save_state(f, se->opaque);
        return;
    }
    vmstate_save_state(f,se->vmsd, se->opaque);
1357 1358
}

A
aliguori 已提交
1359 1360 1361 1362 1363 1364 1365 1366 1367
#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
J
Juan Quintela 已提交
1368
#define QEMU_VM_SUBSECTION           0x05
A
aliguori 已提交
1369

1370 1371
int qemu_savevm_state_begin(Monitor *mon, QEMUFile *f, int blk_enable,
                            int shared)
A
aliguori 已提交
1372 1373 1374
{
    SaveStateEntry *se;

L
lirans@il.ibm.com 已提交
1375 1376 1377 1378 1379 1380 1381
    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
1382 1383 1384
    qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
    qemu_put_be32(f, QEMU_VM_FILE_VERSION);

B
Blue Swirl 已提交
1385
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402
        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);

1403
        se->save_live_state(mon, f, QEMU_VM_SECTION_START, se->opaque);
A
aliguori 已提交
1404 1405
    }

1406
    if (qemu_file_has_error(f)) {
1407
        qemu_savevm_state_cancel(mon, f);
A
aliguori 已提交
1408
        return -EIO;
1409
    }
A
aliguori 已提交
1410 1411 1412 1413

    return 0;
}

1414
int qemu_savevm_state_iterate(Monitor *mon, QEMUFile *f)
A
aliguori 已提交
1415 1416 1417 1418
{
    SaveStateEntry *se;
    int ret = 1;

B
Blue Swirl 已提交
1419
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1420 1421 1422 1423 1424 1425 1426
        if (se->save_live_state == NULL)
            continue;

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

1427 1428 1429 1430 1431 1432 1433 1434
        ret = se->save_live_state(mon, f, QEMU_VM_SECTION_PART, se->opaque);
        if (!ret) {
            /* Do not proceed to the next vmstate before this one reported
               completion of the current stage. This serializes the migration
               and reduces the probability that a faster changing state is
               synchronized over and over again. */
            break;
        }
A
aliguori 已提交
1435 1436 1437 1438 1439
    }

    if (ret)
        return 1;

1440
    if (qemu_file_has_error(f)) {
1441
        qemu_savevm_state_cancel(mon, f);
A
aliguori 已提交
1442
        return -EIO;
1443
    }
A
aliguori 已提交
1444 1445 1446 1447

    return 0;
}

1448
int qemu_savevm_state_complete(Monitor *mon, QEMUFile *f)
A
aliguori 已提交
1449 1450 1451
{
    SaveStateEntry *se;

1452 1453
    cpu_synchronize_all_states();

B
Blue Swirl 已提交
1454
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1455 1456 1457 1458 1459 1460 1461
        if (se->save_live_state == NULL)
            continue;

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

1462
        se->save_live_state(mon, f, QEMU_VM_SECTION_END, se->opaque);
A
aliguori 已提交
1463 1464
    }

B
Blue Swirl 已提交
1465
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1466 1467
        int len;

1468
	if (se->save_state == NULL && se->vmsd == NULL)
A
aliguori 已提交
1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
	    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);

1483
        vmstate_save(f, se);
A
aliguori 已提交
1484 1485 1486 1487 1488 1489 1490 1491 1492 1493
    }

    qemu_put_byte(f, QEMU_VM_EOF);

    if (qemu_file_has_error(f))
        return -EIO;

    return 0;
}

1494
void qemu_savevm_state_cancel(Monitor *mon, QEMUFile *f)
1495 1496 1497 1498 1499
{
    SaveStateEntry *se;

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
        if (se->save_live_state) {
1500
            se->save_live_state(mon, f, -1, se->opaque);
1501 1502 1503 1504
        }
    }
}

1505
static int qemu_savevm_state(Monitor *mon, QEMUFile *f)
A
aliguori 已提交
1506 1507 1508 1509 1510 1511 1512 1513 1514
{
    int saved_vm_running;
    int ret;

    saved_vm_running = vm_running;
    vm_stop(0);

    bdrv_flush_all();

1515
    ret = qemu_savevm_state_begin(mon, f, 0, 0);
A
aliguori 已提交
1516 1517 1518 1519
    if (ret < 0)
        goto out;

    do {
1520
        ret = qemu_savevm_state_iterate(mon, f);
A
aliguori 已提交
1521 1522 1523 1524
        if (ret < 0)
            goto out;
    } while (ret == 0);

1525
    ret = qemu_savevm_state_complete(mon, f);
A
aliguori 已提交
1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540

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
1541
    QTAILQ_FOREACH(se, &savevm_handlers, entry) {
A
aliguori 已提交
1542
        if (!strcmp(se->idstr, idstr) &&
J
Jan Kiszka 已提交
1543 1544
            (instance_id == se->instance_id ||
             instance_id == se->alias_id))
A
aliguori 已提交
1545
            return se;
1546 1547 1548 1549 1550 1551 1552
        /* Migrating from an older version? */
        if (strstr(se->idstr, idstr) && se->compat) {
            if (!strcmp(se->compat->idstr, idstr) &&
                (instance_id == se->compat->instance_id ||
                 instance_id == se->alias_id))
                return se;
        }
A
aliguori 已提交
1553 1554 1555 1556
    }
    return NULL;
}

J
Juan Quintela 已提交
1557 1558 1559 1560 1561 1562 1563 1564 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 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
static const VMStateDescription *vmstate_get_subsection(const VMStateSubsection *sub, char *idstr)
{
    while(sub && sub->needed) {
        if (strcmp(idstr, sub->vmsd->name) == 0) {
            return sub->vmsd;
        }
        sub++;
    }
    return NULL;
}

static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription *vmsd,
                                   void *opaque)
{
    while (qemu_peek_byte(f) == QEMU_VM_SUBSECTION) {
        char idstr[256];
        int ret;
        uint8_t version_id, subsection, len;
        const VMStateDescription *sub_vmsd;

        subsection = qemu_get_byte(f);
        len = qemu_get_byte(f);
        qemu_get_buffer(f, (uint8_t *)idstr, len);
        idstr[len] = 0;
        version_id = qemu_get_be32(f);

        sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
        if (sub_vmsd == NULL) {
            return -ENOENT;
        }
        ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
        if (ret) {
            return ret;
        }
    }
    return 0;
}

static void vmstate_subsection_save(QEMUFile *f, const VMStateDescription *vmsd,
                                    void *opaque)
{
    const VMStateSubsection *sub = vmsd->subsections;

    while (sub && sub->needed) {
        if (sub->needed(opaque)) {
            const VMStateDescription *vmsd = sub->vmsd;
            uint8_t len;

            qemu_put_byte(f, QEMU_VM_SUBSECTION);
            len = strlen(vmsd->name);
            qemu_put_byte(f, len);
            qemu_put_buffer(f, (uint8_t *)vmsd->name, len);
            qemu_put_be32(f, vmsd->version_id);
            vmstate_save_state(f, vmsd, opaque);
        }
        sub++;
    }
}

A
aliguori 已提交
1616
typedef struct LoadStateEntry {
B
Blue Swirl 已提交
1617
    QLIST_ENTRY(LoadStateEntry) entry;
A
aliguori 已提交
1618 1619 1620 1621 1622 1623 1624
    SaveStateEntry *se;
    int section_id;
    int version_id;
} LoadStateEntry;

int qemu_loadvm_state(QEMUFile *f)
{
B
Blue Swirl 已提交
1625 1626
    QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
        QLIST_HEAD_INITIALIZER(loadvm_handlers);
1627
    LoadStateEntry *le, *new_le;
A
aliguori 已提交
1628 1629 1630 1631 1632 1633 1634 1635 1636
    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
1637 1638 1639 1640
    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
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682
    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
1683
            QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
A
aliguori 已提交
1684

1685
            ret = vmstate_load(f, le->se, le->version_id);
1686 1687 1688 1689 1690
            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
1691 1692 1693 1694 1695
            break;
        case QEMU_VM_SECTION_PART:
        case QEMU_VM_SECTION_END:
            section_id = qemu_get_be32(f);

B
Blue Swirl 已提交
1696
            QLIST_FOREACH(le, &loadvm_handlers, entry) {
1697 1698 1699 1700
                if (le->section_id == section_id) {
                    break;
                }
            }
A
aliguori 已提交
1701 1702 1703 1704 1705 1706
            if (le == NULL) {
                fprintf(stderr, "Unknown savevm section %d\n", section_id);
                ret = -EINVAL;
                goto out;
            }

1707
            ret = vmstate_load(f, le->se, le->version_id);
1708 1709 1710 1711 1712
            if (ret < 0) {
                fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
                        section_id);
                goto out;
            }
A
aliguori 已提交
1713 1714 1715 1716 1717 1718 1719 1720
            break;
        default:
            fprintf(stderr, "Unknown savevm section type %d\n", section_type);
            ret = -EINVAL;
            goto out;
        }
    }

1721 1722
    cpu_synchronize_all_post_init();

A
aliguori 已提交
1723 1724 1725
    ret = 0;

out:
B
Blue Swirl 已提交
1726 1727
    QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
        QLIST_REMOVE(le, entry);
A
aliguori 已提交
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758
        qemu_free(le);
    }

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

    return ret;
}

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;
}

1759 1760 1761 1762 1763 1764 1765 1766 1767
/*
 * Deletes snapshots of a given name in all opened images.
 */
static int del_existing_snapshots(Monitor *mon, const char *name)
{
    BlockDriverState *bs;
    QEMUSnapshotInfo sn1, *snapshot = &sn1;
    int ret;

1768 1769
    bs = NULL;
    while ((bs = bdrv_next(bs))) {
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785
        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;
}

1786
void do_savevm(Monitor *mon, const QDict *qdict)
A
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1787 1788 1789
{
    BlockDriverState *bs, *bs1;
    QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
1790
    int ret;
A
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1791 1792
    QEMUFile *f;
    int saved_vm_running;
1793
    uint32_t vm_state_size;
A
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1794 1795 1796 1797 1798
#ifdef _WIN32
    struct _timeb tb;
#else
    struct timeval tv;
#endif
1799
    const char *name = qdict_get_try_str(qdict, "name");
A
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1800

1801
    /* Verify if there is a device that doesn't support snapshots and is writable */
1802 1803
    bs = NULL;
    while ((bs = bdrv_next(bs))) {
1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815

        if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
            continue;
        }

        if (!bdrv_can_snapshot(bs)) {
            monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
                               bdrv_get_device_name(bs));
            return;
        }
    }

1816
    bs = bdrv_snapshots();
A
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1817
    if (!bs) {
A
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1818
        monitor_printf(mon, "No block device can accept snapshots\n");
A
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1819 1820 1821 1822 1823 1824 1825 1826
        return;
    }
    /* ??? Should this occur after vm_stop?  */
    qemu_aio_flush();

    saved_vm_running = vm_running;
    vm_stop(0);

1827
    memset(sn, 0, sizeof(*sn));
A
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1828 1829 1830
    if (name) {
        ret = bdrv_snapshot_find(bs, old_sn, name);
        if (ret >= 0) {
1831 1832 1833
            pstrcpy(sn->name, sizeof(sn->name), old_sn->name);
            pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);
        } else {
A
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1834
            pstrcpy(sn->name, sizeof(sn->name), name);
1835
        }
A
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1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
    }

    /* 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);

1850
    /* Delete old snapshots of the same name */
1851
    if (name && del_existing_snapshots(mon, name) < 0) {
1852 1853 1854
        goto the_end;
    }

A
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1855
    /* save the VM state */
1856
    f = qemu_fopen_bdrv(bs, 1);
A
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1857
    if (!f) {
A
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1858
        monitor_printf(mon, "Could not open VM state file\n");
A
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1859 1860
        goto the_end;
    }
1861
    ret = qemu_savevm_state(mon, f);
1862
    vm_state_size = qemu_ftell(f);
A
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1863 1864
    qemu_fclose(f);
    if (ret < 0) {
A
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1865
        monitor_printf(mon, "Error %d while writing VM\n", ret);
A
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1866 1867 1868 1869 1870
        goto the_end;
    }

    /* create the snapshots */

1871 1872
    bs1 = NULL;
    while ((bs1 = bdrv_next(bs1))) {
1873
        if (bdrv_can_snapshot(bs1)) {
1874 1875
            /* 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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1876 1877
            ret = bdrv_snapshot_create(bs1, sn);
            if (ret < 0) {
A
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1878 1879
                monitor_printf(mon, "Error while creating snapshot on '%s'\n",
                               bdrv_get_device_name(bs1));
A
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1880 1881 1882 1883 1884 1885 1886 1887 1888
            }
        }
    }

 the_end:
    if (saved_vm_running)
        vm_start();
}

1889
int load_vmstate(const char *name)
A
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1890 1891
{
    BlockDriverState *bs, *bs1;
1892
    QEMUSnapshotInfo sn;
A
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1893
    QEMUFile *f;
G
Gerd Hoffmann 已提交
1894
    int ret;
A
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1895

1896
    /* Verify if there is a device that doesn't support snapshots and is writable */
1897 1898
    bs = NULL;
    while ((bs = bdrv_next(bs))) {
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910

        if (bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
            continue;
        }

        if (!bdrv_can_snapshot(bs)) {
            error_report("Device '%s' is writable but does not support snapshots.",
                               bdrv_get_device_name(bs));
            return -ENOTSUP;
        }
    }

1911
    bs = bdrv_snapshots();
A
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1912
    if (!bs) {
1913
        error_report("No block device supports snapshots");
1914
        return -EINVAL;
A
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1915 1916 1917 1918 1919
    }

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

1920 1921
    bs1 = NULL;
    while ((bs1 = bdrv_next(bs1))) {
1922
        if (bdrv_can_snapshot(bs1)) {
A
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1923 1924 1925 1926
            ret = bdrv_snapshot_goto(bs1, name);
            if (ret < 0) {
                switch(ret) {
                case -ENOTSUP:
1927 1928 1929
                    error_report("%sSnapshots not supported on device '%s'",
                                 bs != bs1 ? "Warning: " : "",
                                 bdrv_get_device_name(bs1));
A
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1930 1931
                    break;
                case -ENOENT:
1932 1933 1934
                    error_report("%sCould not find snapshot '%s' on device '%s'",
                                 bs != bs1 ? "Warning: " : "",
                                 name, bdrv_get_device_name(bs1));
A
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1935 1936
                    break;
                default:
1937 1938 1939
                    error_report("%sError %d while activating snapshot on '%s'",
                                 bs != bs1 ? "Warning: " : "",
                                 ret, bdrv_get_device_name(bs1));
A
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1940 1941 1942 1943
                    break;
                }
                /* fatal on snapshot block device */
                if (bs == bs1)
1944
                    return 0;
A
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1945 1946 1947 1948
            }
        }
    }

1949 1950 1951
    /* Don't even try to load empty VM states */
    ret = bdrv_snapshot_find(bs, &sn, name);
    if ((ret >= 0) && (sn.vm_state_size == 0))
1952
        return -EINVAL;
1953

A
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1954
    /* restore the VM state */
1955
    f = qemu_fopen_bdrv(bs, 0);
A
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1956
    if (!f) {
1957
        error_report("Could not open VM state file");
1958
        return -EINVAL;
A
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1959 1960 1961 1962
    }
    ret = qemu_loadvm_state(f);
    qemu_fclose(f);
    if (ret < 0) {
1963
        error_report("Error %d while loading VM state", ret);
1964
        return ret;
A
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1965
    }
1966
    return 0;
1967 1968
}

1969
void do_delvm(Monitor *mon, const QDict *qdict)
A
aliguori 已提交
1970 1971
{
    BlockDriverState *bs, *bs1;
G
Gerd Hoffmann 已提交
1972
    int ret;
1973
    const char *name = qdict_get_str(qdict, "name");
A
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1974

1975
    bs = bdrv_snapshots();
A
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1976
    if (!bs) {
A
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1977
        monitor_printf(mon, "No block device supports snapshots\n");
A
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1978 1979 1980
        return;
    }

1981 1982
    bs1 = NULL;
    while ((bs1 = bdrv_next(bs1))) {
1983
        if (bdrv_can_snapshot(bs1)) {
A
aliguori 已提交
1984 1985 1986
            ret = bdrv_snapshot_delete(bs1, name);
            if (ret < 0) {
                if (ret == -ENOTSUP)
A
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1987 1988 1989
                    monitor_printf(mon,
                                   "Snapshots not supported on device '%s'\n",
                                   bdrv_get_device_name(bs1));
A
aliguori 已提交
1990
                else
A
aliguori 已提交
1991 1992
                    monitor_printf(mon, "Error %d while deleting snapshot on "
                                   "'%s'\n", ret, bdrv_get_device_name(bs1));
A
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1993 1994 1995 1996 1997
            }
        }
    }
}

A
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1998
void do_info_snapshots(Monitor *mon)
A
aliguori 已提交
1999 2000 2001 2002 2003 2004
{
    BlockDriverState *bs, *bs1;
    QEMUSnapshotInfo *sn_tab, *sn;
    int nb_sns, i;
    char buf[256];

2005
    bs = bdrv_snapshots();
A
aliguori 已提交
2006
    if (!bs) {
A
aliguori 已提交
2007
        monitor_printf(mon, "No available block device supports snapshots\n");
A
aliguori 已提交
2008 2009
        return;
    }
A
aliguori 已提交
2010
    monitor_printf(mon, "Snapshot devices:");
2011 2012
    bs1 = NULL;
    while ((bs1 = bdrv_next(bs1))) {
2013
        if (bdrv_can_snapshot(bs1)) {
A
aliguori 已提交
2014
            if (bs == bs1)
A
aliguori 已提交
2015
                monitor_printf(mon, " %s", bdrv_get_device_name(bs1));
A
aliguori 已提交
2016 2017
        }
    }
A
aliguori 已提交
2018
    monitor_printf(mon, "\n");
A
aliguori 已提交
2019 2020 2021

    nb_sns = bdrv_snapshot_list(bs, &sn_tab);
    if (nb_sns < 0) {
A
aliguori 已提交
2022
        monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
A
aliguori 已提交
2023 2024
        return;
    }
A
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2025 2026 2027
    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
2028 2029
    for(i = 0; i < nb_sns; i++) {
        sn = &sn_tab[i];
A
aliguori 已提交
2030
        monitor_printf(mon, "%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
A
aliguori 已提交
2031 2032 2033
    }
    qemu_free(sn_tab);
}