hw/virtio-balloon.h

   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 #include "pci.h"
  20
  21 /* from Linux's linux/virtio_balloon.h */
  22
  23 /* The ID for virtio_balloon */
  24 #define VIRTIO_ID_BALLOON 5
  25
  26 /* The feature bitmap for virtio balloon */
  27 #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
  28
  29 /* Size of a PFN in the balloon interface. */
  30 #define VIRTIO_BALLOON_PFN_SHIFT 12
  31
  32 struct virtio_balloon_config
  33 {
  34     /* Number of pages host wants Guest to give up. */
  35     uint32_t num_pages;
  36     /* Number of pages we've actually got in balloon. */
  37     uint32_t actual;
  38 };
  39
  40 void *virtio_balloon_init(PCIBus *bus);
  41
  42 #endif