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