1 /*

     2  * Virtio Support

     3  *

     4  * Copyright IBM, Corp. 2007-2008

     5  *

     6  * Authors:

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

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

     9  *

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

    11  * the COPYING file in the top-level directory.

    12  *

    13  */

    14 

    15 #ifndef _QEMU_VIRTIO_BALLOON_H

    16 #define _QEMU_VIRTIO_BALLOON_H

    17 

    18 #include "virtio.h"

    19 

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

    21 

    22 /* The ID for virtio_balloon */

    23 #define VIRTIO_ID_BALLOON 5

    24 

    25 /* The feature bitmap for virtio balloon */

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

    27 

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

    29 #define VIRTIO_BALLOON_PFN_SHIFT 12

    30 

    31 struct virtio_balloon_config

    32 {

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

    34     uint32_t num_pages;

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

    36     uint32_t actual;

    37 };

    38 

    39 void virtio_balloon_init(VirtIOBindFn bind, void *bind_arg);

    40 

    41 #endif