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1#ifndef _LINUX_VIRTIO_BALLOON_H
2#define _LINUX_VIRTIO_BALLOON_H
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3/* This header is BSD licensed so anyone can use the definitions to implement
4 * compatible drivers/servers. */
e95646c3 5#include <linux/virtio_ids.h>
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6#include <linux/virtio_config.h>
7
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8/* The feature bitmap for virtio balloon */
9#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
9564e138 10#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */
6b35e407 11
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12/* Size of a PFN in the balloon interface. */
13#define VIRTIO_BALLOON_PFN_SHIFT 12
14
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15struct virtio_balloon_config
16{
17 /* Number of pages host wants Guest to give up. */
18 __le32 num_pages;
19 /* Number of pages we've actually got in balloon. */
20 __le32 actual;
21};
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22
23#define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
24#define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */
25#define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */
26#define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */
27#define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */
28#define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */
29#define VIRTIO_BALLOON_S_NR 6
30
31struct virtio_balloon_stat {
32 u16 tag;
33 u64 val;
34} __attribute__((packed));
35
6b35e407 36#endif /* _LINUX_VIRTIO_BALLOON_H */