Archipelago » qemu

/*

 * 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 "config-host.h"

#include "qemu-common.h"

#include "hw/hw.h"

#include "hw/qdev.h"

#include "net/net.h"

#include "monitor/monitor.h"

#include "sysemu/sysemu.h"

#include "qemu/timer.h"

#include "audio/audio.h"

#include "migration/migration.h"

#include "qemu/sockets.h"

#include "qemu/queue.h"

#include "sysemu/cpus.h"

#include "exec/memory.h"

#include "qmp-commands.h"

#include "trace.h"

#include "qemu/iov.h"

#include "block/snapshot.h"

#include "block/qapi.h"

#define SELF_ANNOUNCE_ROUNDS 5

#ifndef ETH_P_RARP

#define ETH_P_RARP 0x8035

#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,

                                uint8_t *mac_addr)

{

    /* 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) */

}

static void qemu_announce_self_iter(NICState *nic, void *opaque)

{

    uint8_t buf[60];

    int len;

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

    qemu_send_packet_raw(qemu_get_queue(nic), buf, len);

}

static void qemu_announce_self_once(void *opaque)

{

    static int count = SELF_ANNOUNCE_ROUNDS;

    QEMUTimer *timer = *(QEMUTimer **)opaque;

    qemu_foreach_nic(qemu_announce_self_iter, NULL);

    if (--count) {

        /* delay 50ms, 150ms, 250ms, ... */

        timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) +

                       50 + (SELF_ANNOUNCE_ROUNDS - count - 1) * 100);

    } else {

            timer_del(timer);

            timer_free(timer);

    }

}

void qemu_announce_self(void)

{

    static QEMUTimer *timer;

    timer = timer_new_ms(QEMU_CLOCK_REALTIME, qemu_announce_self_once, &timer);

    qemu_announce_self_once(&timer);

}

/***********************************************************/

/* savevm/loadvm support */

static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,

                                   int64_t pos)

{

    int ret;

    QEMUIOVector qiov;

    qemu_iovec_init_external(&qiov, iov, iovcnt);

    ret = bdrv_writev_vmstate(opaque, &qiov, pos);

    if (ret < 0) {

        return ret;

    }

    return qiov.size;

}

static int block_put_buffer(void *opaque, const uint8_t *buf,

                           int64_t pos, int size)

{

    bdrv_save_vmstate(opaque, buf, pos, size);

    return size;

}

static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)

{

    return bdrv_load_vmstate(opaque, buf, pos, size);

}

static int bdrv_fclose(void *opaque)

{

    return bdrv_flush(opaque);

}

static const QEMUFileOps bdrv_read_ops = {

    .get_buffer = block_get_buffer,

    .close =      bdrv_fclose

};

static const QEMUFileOps bdrv_write_ops = {

    .put_buffer     = block_put_buffer,

    .writev_buffer  = block_writev_buffer,

    .close          = bdrv_fclose

};

static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)

{

    if (is_writable) {

        return qemu_fopen_ops(bs, &bdrv_write_ops);

    }

    return qemu_fopen_ops(bs, &bdrv_read_ops);

}

/* QEMUFile timer support.

 * Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c

 */

void timer_put(QEMUFile *f, QEMUTimer *ts)

{

    uint64_t expire_time;

    expire_time = timer_expire_time_ns(ts);

    qemu_put_be64(f, expire_time);

}

void timer_get(QEMUFile *f, QEMUTimer *ts)

{

    uint64_t expire_time;

    expire_time = qemu_get_be64(f);

    if (expire_time != -1) {

        timer_mod_ns(ts, expire_time);

    } else {

        timer_del(ts);

    }

}

/* VMState timer support.

 * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c

 */

static int get_timer(QEMUFile *f, void *pv, size_t size)

{

    QEMUTimer *v = pv;

    timer_get(f, v);

    return 0;

}

static void put_timer(QEMUFile *f, void *pv, size_t size)

{

    QEMUTimer *v = pv;

    timer_put(f, v);

}

const VMStateInfo vmstate_info_timer = {

    .name = "timer",

    .get  = get_timer,

    .put  = put_timer,

};

typedef struct CompatEntry {

    char idstr[256];

    int instance_id;

} CompatEntry;

typedef struct SaveStateEntry {

    QTAILQ_ENTRY(SaveStateEntry) entry;

    char idstr[256];

    int instance_id;

    int alias_id;

    int version_id;

    int section_id;

    SaveVMHandlers *ops;

    const VMStateDescription *vmsd;

    void *opaque;

    CompatEntry *compat;

    int no_migrate;

    int is_ram;

} SaveStateEntry;

static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =

    QTAILQ_HEAD_INITIALIZER(savevm_handlers);

static int global_section_id;

static int calculate_new_instance_id(const char *idstr)

{

    SaveStateEntry *se;

    int instance_id = 0;

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        if (strcmp(idstr, se->idstr) == 0

            && instance_id <= se->instance_id) {

            instance_id = se->instance_id + 1;

        }

    }

    return instance_id;

}

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;

}

/* 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(DeviceState *dev,

                         const char *idstr,

                         int instance_id,

                         int version_id,

                         SaveVMHandlers *ops,

                         void *opaque)

{

    SaveStateEntry *se;

    se = g_malloc0(sizeof(SaveStateEntry));

    se->version_id = version_id;

    se->section_id = global_section_id++;

    se->ops = ops;

    se->opaque = opaque;

    se->vmsd = NULL;

    se->no_migrate = 0;

    /* if this is a live_savem then set is_ram */

    if (ops->save_live_setup != NULL) {

        se->is_ram = 1;

    }

    if (dev) {

        char *id = qdev_get_dev_path(dev);

        if (id) {

            pstrcpy(se->idstr, sizeof(se->idstr), id);

            pstrcat(se->idstr, sizeof(se->idstr), "/");

            g_free(id);

            se->compat = g_malloc0(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);

    if (instance_id == -1) {

        se->instance_id = calculate_new_instance_id(se->idstr);

    } else {

        se->instance_id = instance_id;

    }

    assert(!se->compat || se->instance_id == 0);

    /* add at the end of list */

    QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);

    return 0;

}

int register_savevm(DeviceState *dev,

                    const char *idstr,

                    int instance_id,

                    int version_id,

                    SaveStateHandler *save_state,

                    LoadStateHandler *load_state,

                    void *opaque)

{

    SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));

    ops->save_state = save_state;

    ops->load_state = load_state;

    return register_savevm_live(dev, idstr, instance_id, version_id,

                                ops, opaque);

}

void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)

{

    SaveStateEntry *se, *new_se;

    char id[256] = "";

    if (dev) {

        char *path = qdev_get_dev_path(dev);

        if (path) {

            pstrcpy(id, sizeof(id), path);

            pstrcat(id, sizeof(id), "/");

            g_free(path);

        }

    }

    pstrcat(id, sizeof(id), idstr);

    QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {

        if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {

            QTAILQ_REMOVE(&savevm_handlers, se, entry);

            if (se->compat) {

                g_free(se->compat);

            }

            g_free(se->ops);

            g_free(se);

        }

    }

}

int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,

                                   const VMStateDescription *vmsd,

                                   void *opaque, int alias_id,

                                   int required_for_version)

{

    SaveStateEntry *se;

    /* If this triggers, alias support can be dropped for the vmsd. */

    assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id);

    se = g_malloc0(sizeof(SaveStateEntry));

    se->version_id = vmsd->version_id;

    se->section_id = global_section_id++;

    se->opaque = opaque;

    se->vmsd = vmsd;

    se->alias_id = alias_id;

    se->no_migrate = vmsd->unmigratable;

    if (dev) {

        char *id = qdev_get_dev_path(dev);

        if (id) {

            pstrcpy(se->idstr, sizeof(se->idstr), id);

            pstrcat(se->idstr, sizeof(se->idstr), "/");

            g_free(id);

            se->compat = g_malloc0(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);

    if (instance_id == -1) {

        se->instance_id = calculate_new_instance_id(se->idstr);

    } else {

        se->instance_id = instance_id;

    }

    assert(!se->compat || se->instance_id == 0);

    /* add at the end of list */

    QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);

    return 0;

}

void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,

                        void *opaque)

{

    SaveStateEntry *se, *new_se;

    QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {

        if (se->vmsd == vmsd && se->opaque == opaque) {

            QTAILQ_REMOVE(&savevm_handlers, se, entry);

            if (se->compat) {

                g_free(se->compat);

            }

            g_free(se);

        }

    }

}

static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)

{

    if (!se->vmsd) {         /* Old style */

        return se->ops->load_state(f, se->opaque, version_id);

    }

    return vmstate_load_state(f, se->vmsd, se->opaque, version_id);

}

static void vmstate_save(QEMUFile *f, SaveStateEntry *se)

{

    if (!se->vmsd) {         /* Old style */

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

        return;

    }

    vmstate_save_state(f, se->vmsd, se->opaque);

}

bool qemu_savevm_state_blocked(Error **errp)

{

    SaveStateEntry *se;

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        if (se->no_migrate) {

            error_set(errp, QERR_MIGRATION_NOT_SUPPORTED, se->idstr);

            return true;

        }

    }

    return false;

}

void qemu_savevm_state_begin(QEMUFile *f,

                             const MigrationParams *params)

{

    SaveStateEntry *se;

    int ret;

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        if (!se->ops || !se->ops->set_params) {

            continue;

        }

        se->ops->set_params(params, se->opaque);

    }

    qemu_put_be32(f, QEMU_VM_FILE_MAGIC);

    qemu_put_be32(f, QEMU_VM_FILE_VERSION);

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        int len;

        if (!se->ops || !se->ops->save_live_setup) {

            continue;

        }

        if (se->ops && se->ops->is_active) {

            if (!se->ops->is_active(se->opaque)) {

                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);

        ret = se->ops->save_live_setup(f, se->opaque);

        if (ret < 0) {

            qemu_file_set_error(f, ret);

            break;

        }

    }

}

/*

 * this function has three return values:

 *   negative: there was one error, and we have -errno.

 *   0 : We haven't finished, caller have to go again

 *   1 : We have finished, we can go to complete phase

 */

int qemu_savevm_state_iterate(QEMUFile *f)

{

    SaveStateEntry *se;

    int ret = 1;

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        if (!se->ops || !se->ops->save_live_iterate) {

            continue;

        }

        if (se->ops && se->ops->is_active) {

            if (!se->ops->is_active(se->opaque)) {

                continue;

            }

        }

        if (qemu_file_rate_limit(f)) {

            return 0;

        }

        trace_savevm_section_start();

        /* Section type */

        qemu_put_byte(f, QEMU_VM_SECTION_PART);

        qemu_put_be32(f, se->section_id);

        ret = se->ops->save_live_iterate(f, se->opaque);

        trace_savevm_section_end(se->section_id);

        if (ret < 0) {

            qemu_file_set_error(f, ret);

        }

        if (ret <= 0) {

            /* 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;

        }

    }

    return ret;

}

void qemu_savevm_state_complete(QEMUFile *f)

{

    SaveStateEntry *se;

    int ret;

    cpu_synchronize_all_states();

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        if (!se->ops || !se->ops->save_live_complete) {

            continue;

        }

        if (se->ops && se->ops->is_active) {

            if (!se->ops->is_active(se->opaque)) {

                continue;

            }

        }

        trace_savevm_section_start();

        /* Section type */

        qemu_put_byte(f, QEMU_VM_SECTION_END);

        qemu_put_be32(f, se->section_id);

        ret = se->ops->save_live_complete(f, se->opaque);

        trace_savevm_section_end(se->section_id);

        if (ret < 0) {

            qemu_file_set_error(f, ret);

            return;

        }

    }

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        int len;

        if ((!se->ops || !se->ops->save_state) && !se->vmsd) {

            continue;

        }

        trace_savevm_section_start();

        /* 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);

        vmstate_save(f, se);

        trace_savevm_section_end(se->section_id);

    }

    qemu_put_byte(f, QEMU_VM_EOF);

    qemu_fflush(f);

}

uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)

{

    SaveStateEntry *se;

    uint64_t ret = 0;

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        if (!se->ops || !se->ops->save_live_pending) {

            continue;

        }

        if (se->ops && se->ops->is_active) {

            if (!se->ops->is_active(se->opaque)) {

                continue;

            }

        }

        ret += se->ops->save_live_pending(f, se->opaque, max_size);

    }

    return ret;

}

void qemu_savevm_state_cancel(void)

{

    SaveStateEntry *se;

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        if (se->ops && se->ops->cancel) {

            se->ops->cancel(se->opaque);

        }

    }

}

static int qemu_savevm_state(QEMUFile *f)

{

    int ret;

    MigrationParams params = {

        .blk = 0,

        .shared = 0

    };

    if (qemu_savevm_state_blocked(NULL)) {

        return -EINVAL;

    }

    qemu_mutex_unlock_iothread();

    qemu_savevm_state_begin(f, &params);

    qemu_mutex_lock_iothread();

    while (qemu_file_get_error(f) == 0) {

        if (qemu_savevm_state_iterate(f) > 0) {

            break;

        }

    }

    ret = qemu_file_get_error(f);

    if (ret == 0) {

        qemu_savevm_state_complete(f);

        ret = qemu_file_get_error(f);

    }

    if (ret != 0) {

        qemu_savevm_state_cancel();

    }

    return ret;

}

static int qemu_save_device_state(QEMUFile *f)

{

    SaveStateEntry *se;

    qemu_put_be32(f, QEMU_VM_FILE_MAGIC);

    qemu_put_be32(f, QEMU_VM_FILE_VERSION);

    cpu_synchronize_all_states();

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        int len;

        if (se->is_ram) {

            continue;

        }

        if ((!se->ops || !se->ops->save_state) && !se->vmsd) {

            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);

        vmstate_save(f, se);

    }

    qemu_put_byte(f, QEMU_VM_EOF);

    return qemu_file_get_error(f);

}

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

{

    SaveStateEntry *se;

    QTAILQ_FOREACH(se, &savevm_handlers, entry) {

        if (!strcmp(se->idstr, idstr) &&

            (instance_id == se->instance_id ||

             instance_id == se->alias_id))

            return se;

        /* 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;

        }

    }

    return NULL;

}

typedef struct LoadStateEntry {

    QLIST_ENTRY(LoadStateEntry) entry;

    SaveStateEntry *se;

    int section_id;

    int version_id;

} LoadStateEntry;

int qemu_loadvm_state(QEMUFile *f)

{

    QLIST_HEAD(, LoadStateEntry) loadvm_handlers =

        QLIST_HEAD_INITIALIZER(loadvm_handlers);

    LoadStateEntry *le, *new_le;

    uint8_t section_type;

    unsigned int v;

    int ret;

    if (qemu_savevm_state_blocked(NULL)) {

        return -EINVAL;

    }

    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) {

        fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");

        return -ENOTSUP;

    }

    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 = g_malloc0(sizeof(*le));

            le->se = se;

            le->section_id = section_id;

            le->version_id = version_id;

            QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);

            ret = vmstate_load(f, le->se, le->version_id);

            if (ret < 0) {

                fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",

                        instance_id, idstr);

                goto out;

            }

            break;

        case QEMU_VM_SECTION_PART:

        case QEMU_VM_SECTION_END:

            section_id = qemu_get_be32(f);

            QLIST_FOREACH(le, &loadvm_handlers, entry) {

                if (le->section_id == section_id) {

                    break;

                }

            }

            if (le == NULL) {

                fprintf(stderr, "Unknown savevm section %d\n", section_id);

                ret = -EINVAL;

                goto out;

            }

            ret = vmstate_load(f, le->se, le->version_id);

            if (ret < 0) {

                fprintf(stderr, "qemu: warning: error while loading state section id %d\n",

                        section_id);

                goto out;

            }

            break;

        default:

            fprintf(stderr, "Unknown savevm section type %d\n", section_type);

            ret = -EINVAL;

            goto out;

        }

    }

    cpu_synchronize_all_post_init();

    ret = 0;

out:

    QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {

        QLIST_REMOVE(le, entry);

        g_free(le);

    }

    if (ret == 0) {

        ret = qemu_file_get_error(f);

    }

    return ret;

}

static BlockDriverState *find_vmstate_bs(void)

{

    BlockDriverState *bs = NULL;

    while ((bs = bdrv_next(bs))) {

        if (bdrv_can_snapshot(bs)) {

            return bs;

        }

    }

    return NULL;

}

/*

 * 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;

    Error *err = NULL;

    bs = NULL;

    while ((bs = bdrv_next(bs))) {

        if (bdrv_can_snapshot(bs) &&

            bdrv_snapshot_find(bs, snapshot, name) >= 0) {

            bdrv_snapshot_delete_by_id_or_name(bs, name, &err);

            if (err) {

                monitor_printf(mon,

                               "Error while deleting snapshot on device '%s':"

                               " %s\n",

                               bdrv_get_device_name(bs),

                               error_get_pretty(err));

                error_free(err);

                return -1;

            }

        }

    }

    return 0;

}

void do_savevm(Monitor *mon, const QDict *qdict)

{

    BlockDriverState *bs, *bs1;

    QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;

    int ret;

    QEMUFile *f;

    int saved_vm_running;

    uint64_t vm_state_size;

    qemu_timeval tv;

    struct tm tm;

    const char *name = qdict_get_try_str(qdict, "name");

    /* Verify if there is a device that doesn't support snapshots and is writable */

    bs = NULL;

    while ((bs = bdrv_next(bs))) {

        if (!bdrv_is_inserted(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;

        }

    }

    bs = find_vmstate_bs();

    if (!bs) {

        monitor_printf(mon, "No block device can accept snapshots\n");

        return;

    }

    saved_vm_running = runstate_is_running();

    vm_stop(RUN_STATE_SAVE_VM);

    memset(sn, 0, sizeof(*sn));

    /* fill auxiliary fields */

    qemu_gettimeofday(&tv);

    sn->date_sec = tv.tv_sec;

    sn->date_nsec = tv.tv_usec * 1000;

    sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);

    if (name) {

        ret = bdrv_snapshot_find(bs, old_sn, name);

        if (ret >= 0) {

            pstrcpy(sn->name, sizeof(sn->name), old_sn->name);

            pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str);

        } else {

            pstrcpy(sn->name, sizeof(sn->name), name);

        }

    } else {

        /* cast below needed for OpenBSD where tv_sec is still 'long' */

        localtime_r((const time_t *)&tv.tv_sec, &tm);

        strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm);

    }

    /* Delete old snapshots of the same name */

    if (name && del_existing_snapshots(mon, name) < 0) {

        goto the_end;

    }

    /* save the VM state */

    f = qemu_fopen_bdrv(bs, 1);

    if (!f) {

        monitor_printf(mon, "Could not open VM state file\n");

        goto the_end;

    }

    ret = qemu_savevm_state(f);

    vm_state_size = qemu_ftell(f);

    qemu_fclose(f);

    if (ret < 0) {

        monitor_printf(mon, "Error %d while writing VM\n", ret);

        goto the_end;

    }

    /* create the snapshots */

    bs1 = NULL;

    while ((bs1 = bdrv_next(bs1))) {

        if (bdrv_can_snapshot(bs1)) {

            /* Write VM state size only to the image that contains the state */

            sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);

            ret = bdrv_snapshot_create(bs1, sn);

            if (ret < 0) {

                monitor_printf(mon, "Error while creating snapshot on '%s'\n",

                               bdrv_get_device_name(bs1));

            }

        }

    }

 the_end:

    if (saved_vm_running) {

        vm_start();

    }

}

void qmp_xen_save_devices_state(const char *filename, Error **errp)

{

    QEMUFile *f;

    int saved_vm_running;

    int ret;

    saved_vm_running = runstate_is_running();

    vm_stop(RUN_STATE_SAVE_VM);

    f = qemu_fopen(filename, "wb");

    if (!f) {

        error_setg_file_open(errp, errno, filename);

        goto the_end;

    }

    ret = qemu_save_device_state(f);

    qemu_fclose(f);

    if (ret < 0) {

        error_set(errp, QERR_IO_ERROR);

    }

 the_end:

    if (saved_vm_running) {

        vm_start();

    }

}

int load_vmstate(const char *name)

{

    BlockDriverState *bs, *bs_vm_state;

    QEMUSnapshotInfo sn;

    QEMUFile *f;

    int ret;

    bs_vm_state = find_vmstate_bs();

    if (!bs_vm_state) {

        error_report("No block device supports snapshots");

        return -ENOTSUP;

    }

    /* Don't even try to load empty VM states */

    ret = bdrv_snapshot_find(bs_vm_state, &sn, name);

    if (ret < 0) {

        return ret;

    } else if (sn.vm_state_size == 0) {

        error_report("This is a disk-only snapshot. Revert to it offline "

            "using qemu-img.");

        return -EINVAL;

    }

    /* Verify if there is any device that doesn't support snapshots and is

    writable and check if the requested snapshot is available too. */

    bs = NULL;

    while ((bs = bdrv_next(bs))) {

        if (!bdrv_is_inserted(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;

        }

        ret = bdrv_snapshot_find(bs, &sn, name);

        if (ret < 0) {

            error_report("Device '%s' does not have the requested snapshot '%s'",

                           bdrv_get_device_name(bs), name);

            return ret;

        }

    }

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

    bdrv_drain_all();

    bs = NULL;

    while ((bs = bdrv_next(bs))) {

        if (bdrv_can_snapshot(bs)) {

            ret = bdrv_snapshot_goto(bs, name);

            if (ret < 0) {

                error_report("Error %d while activating snapshot '%s' on '%s'",

                             ret, name, bdrv_get_device_name(bs));

                return ret;

            }

        }

    }

    /* restore the VM state */

    f = qemu_fopen_bdrv(bs_vm_state, 0);

    if (!f) {

        error_report("Could not open VM state file");

        return -EINVAL;

    }

    qemu_system_reset(VMRESET_SILENT);

    ret = qemu_loadvm_state(f);

    qemu_fclose(f);

    if (ret < 0) {

        error_report("Error %d while loading VM state", ret);

        return ret;

    }

    return 0;

}

void do_delvm(Monitor *mon, const QDict *qdict)

{

    BlockDriverState *bs, *bs1;

    Error *err = NULL;

    const char *name = qdict_get_str(qdict, "name");

    bs = find_vmstate_bs();

    if (!bs) {

        monitor_printf(mon, "No block device supports snapshots\n");

        return;

    }

    bs1 = NULL;

    while ((bs1 = bdrv_next(bs1))) {

        if (bdrv_can_snapshot(bs1)) {

            bdrv_snapshot_delete_by_id_or_name(bs, name, &err);

            if (err) {

                monitor_printf(mon,

                               "Error while deleting snapshot on device '%s':"

                               " %s\n",

                               bdrv_get_device_name(bs),

                               error_get_pretty(err));

                error_free(err);

            }

        }

    }

}

void do_info_snapshots(Monitor *mon, const QDict *qdict)

{

    BlockDriverState *bs, *bs1;

    QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;

    int nb_sns, i, ret, available;

    int total;

    int *available_snapshots;

    bs = find_vmstate_bs();

    if (!bs) {

        monitor_printf(mon, "No available block device supports snapshots\n");

        return;

    }

    nb_sns = bdrv_snapshot_list(bs, &sn_tab);

    if (nb_sns < 0) {

        monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);

        return;

    }

    if (nb_sns == 0) {

        monitor_printf(mon, "There is no snapshot available.\n");

        return;

    }

    available_snapshots = g_malloc0(sizeof(int) * nb_sns);

    total = 0;

    for (i = 0; i < nb_sns; i++) {

        sn = &sn_tab[i];

        available = 1;

        bs1 = NULL;

        while ((bs1 = bdrv_next(bs1))) {

            if (bdrv_can_snapshot(bs1) && bs1 != bs) {

                ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);

                if (ret < 0) {

                    available = 0;

                    break;

                }

            }

        }

        if (available) {

            available_snapshots[total] = i;

            total++;

        }

    }

    if (total > 0) {

        bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL);

        monitor_printf(mon, "\n");

        for (i = 0; i < total; i++) {

            sn = &sn_tab[available_snapshots[i]];

            bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn);

            monitor_printf(mon, "\n");

        }

    } else {

        monitor_printf(mon, "There is no suitable snapshot available\n");

    }

    g_free(sn_tab);

    g_free(available_snapshots);

}

void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)

{

    qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,

                       memory_region_name(mr), dev);

}

void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)

{

    /* Nothing do to while the implementation is in RAMBlock */

}

void vmstate_register_ram_global(MemoryRegion *mr)

{

    vmstate_register_ram(mr, NULL);

}