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 "hw/virtio.h"
  19 #include "hw/pci/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 #define VIRTIO_BALLOON_F_STATS_VQ 1       /* Memory stats virtqueue */
  29
  30 /* Size of a PFN in the balloon interface. */
  31 #define VIRTIO_BALLOON_PFN_SHIFT 12
  32
  33 struct virtio_balloon_config
  34 {
  35     /* Number of pages host wants Guest to give up. */
  36     uint32_t num_pages;
  37     /* Number of pages we've actually got in balloon. */
  38     uint32_t actual;
  39 };
  40
  41 /* Memory Statistics */
  42 #define VIRTIO_BALLOON_S_SWAP_IN  0   /* Amount of memory swapped in */
  43 #define VIRTIO_BALLOON_S_SWAP_OUT 1   /* Amount of memory swapped out */
  44 #define VIRTIO_BALLOON_S_MAJFLT   2   /* Number of major faults */
  45 #define VIRTIO_BALLOON_S_MINFLT   3   /* Number of minor faults */
  46 #define VIRTIO_BALLOON_S_MEMFREE  4   /* Total amount of free memory */
  47 #define VIRTIO_BALLOON_S_MEMTOT   5   /* Total amount of memory */
  48 #define VIRTIO_BALLOON_S_NR       6
  49
  50 typedef struct VirtIOBalloonStat {
  51     uint16_t tag;
  52     uint64_t val;
  53 } QEMU_PACKED VirtIOBalloonStat;
  54
  55 typedef struct VirtIOBalloon {
  56     VirtIODevice vdev;
  57     VirtQueue *ivq, *dvq, *svq;
  58     uint32_t num_pages;
  59     uint32_t actual;
  60     uint64_t stats[VIRTIO_BALLOON_S_NR];
  61     VirtQueueElement stats_vq_elem;
  62     size_t stats_vq_offset;
  63     QEMUTimer *stats_timer;
  64     int64_t stats_last_update;
  65     int64_t stats_poll_interval;
  66     DeviceState *qdev;
  67 } VirtIOBalloon;
  68
  69 #endif