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 */ 37