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/*

 * Virtio Support

 *

 * Copyright IBM, Corp. 2007-2008

 *

 * Authors:

 *  Anthony Liguori   <aliguori@us.ibm.com>

 *  Rusty Russell     <rusty@rustcorp.com.au>

 *

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

 * the COPYING file in the top-level directory.

 *

 */

#ifndef _QEMU_VIRTIO_BALLOON_H

#define _QEMU_VIRTIO_BALLOON_H

#include "virtio.h"

#include "pci.h"

/* from Linux's linux/virtio_balloon.h */

/* The ID for virtio_balloon */

#define VIRTIO_ID_BALLOON 5

/* The feature bitmap for virtio balloon */

#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */

#define VIRTIO_BALLOON_F_STATS_VQ 1       /* Memory stats virtqueue */

/* Size of a PFN in the balloon interface. */

#define VIRTIO_BALLOON_PFN_SHIFT 12

struct virtio_balloon_config

{

    /* Number of pages host wants Guest to give up. */

    uint32_t num_pages;

    /* Number of pages we've actually got in balloon. */

    uint32_t actual;

};

/* Memory Statistics */

#define VIRTIO_BALLOON_S_SWAP_IN  0   /* Amount of memory swapped in */

#define VIRTIO_BALLOON_S_SWAP_OUT 1   /* Amount of memory swapped out */

#define VIRTIO_BALLOON_S_MAJFLT   2   /* Number of major faults */

#define VIRTIO_BALLOON_S_MINFLT   3   /* Number of minor faults */

#define VIRTIO_BALLOON_S_MEMFREE  4   /* Total amount of free memory */

#define VIRTIO_BALLOON_S_MEMTOT   5   /* Total amount of memory */

#define VIRTIO_BALLOON_S_NR       6

typedef struct VirtIOBalloonStat {

    uint16_t tag;

    uint64_t val;

} __attribute__((packed)) VirtIOBalloonStat;

#endif