include/linux/virtio_balloon.h

   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 #include <linux/virtio_ids.h>
   6 #include <linux/virtio_config.h>
   7
   8 /* The feature bitmap for virtio balloon */
   9 #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
  10 #define VIRTIO_BALLOON_F_STATS_VQ       1 /* Memory Stats virtqueue */
  11
  12 /* Size of a PFN in the balloon interface. */
  13 #define VIRTIO_BALLOON_PFN_SHIFT 12
  14
  15 struct 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 };
  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
  31 struct virtio_balloon_stat {
  32         u16 tag;
  33         u64 val;
  34 } __attribute__((packed));
  35
  36 #endif /* _LINUX_VIRTIO_BALLOON_H */