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/*

 * Virtio RNG Support

 *

 * Copyright Red Hat, Inc. 2012

 * Copyright Amit Shah <amit.shah@redhat.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or

 * (at your option) any later version.  See the COPYING file in the

 * top-level directory.

 */

#ifndef _QEMU_VIRTIO_RNG_H

#define _QEMU_VIRTIO_RNG_H

#include "qemu/rng.h"

#include "qemu/rng-random.h"

/* The Virtio ID for the virtio rng device */

#define VIRTIO_ID_RNG    4

struct VirtIORNGConf {

    RngBackend *rng;

    uint64_t max_bytes;

    uint32_t period_ms;

    RndRandom *default_backend;

};

typedef struct VirtIORNG {

    VirtIODevice vdev;

    DeviceState *qdev;

    /* Only one vq - guest puts buffer(s) on it when it needs entropy */

    VirtQueue *vq;

    VirtIORNGConf *conf;

    RngBackend *rng;

    /* We purposefully don't migrate this state.  The quota will reset on the

     * destination as a result.  Rate limiting is host state, not guest state.

     */

    QEMUTimer *rate_limit_timer;

    int64_t quota_remaining;

} VirtIORNG;

#endif