linux/include/linux/virtio_balloon.h
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   1#ifndef _LINUX_VIRTIO_BALLOON_H
   2#define _LINUX_VIRTIO_BALLOON_H
   3/* This header is BSD licensed so anyone can use the definitions to implement
   4 * compatible drivers/servers.
   5 *
   6 * Redistribution and use in source and binary forms, with or without
   7 * modification, are permitted provided that the following conditions
   8 * are met:
   9 * 1. Redistributions of source code must retain the above copyright
  10 *    notice, this list of conditions and the following disclaimer.
  11 * 2. Redistributions in binary form must reproduce the above copyright
  12 *    notice, this list of conditions and the following disclaimer in the
  13 *    documentation and/or other materials provided with the distribution.
  14 * 3. Neither the name of IBM nor the names of its contributors
  15 *    may be used to endorse or promote products derived from this software
  16 *    without specific prior written permission.
  17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
  18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20 * ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
  21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27 * SUCH DAMAGE. */
  28#include <linux/virtio_ids.h>
  29#include <linux/virtio_config.h>
  30
  31/* The feature bitmap for virtio balloon */
  32#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
  33#define VIRTIO_BALLOON_F_STATS_VQ       1 /* Memory Stats virtqueue */
  34
  35/* Size of a PFN in the balloon interface. */
  36#define VIRTIO_BALLOON_PFN_SHIFT 12
  37
  38struct virtio_balloon_config
  39{
  40        /* Number of pages host wants Guest to give up. */
  41        __le32 num_pages;
  42        /* Number of pages we've actually got in balloon. */
  43        __le32 actual;
  44};
  45
  46#define VIRTIO_BALLOON_S_SWAP_IN  0   /* Amount of memory swapped in */
  47#define VIRTIO_BALLOON_S_SWAP_OUT 1   /* Amount of memory swapped out */
  48#define VIRTIO_BALLOON_S_MAJFLT   2   /* Number of major faults */
  49#define VIRTIO_BALLOON_S_MINFLT   3   /* Number of minor faults */
  50#define VIRTIO_BALLOON_S_MEMFREE  4   /* Total amount of free memory */
  51#define VIRTIO_BALLOON_S_MEMTOT   5   /* Total amount of memory */
  52#define VIRTIO_BALLOON_S_NR       6
  53
  54struct virtio_balloon_stat {
  55        u16 tag;
  56        u64 val;
  57} __attribute__((packed));
  58
  59#endif /* _LINUX_VIRTIO_BALLOON_H */
  60
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