[PATCH v7 kernel 2/5] virtio-balloon: VIRTIO_BALLOON_F_CHUNK_TRANSFER

[Wei Wang]

From: Liang Li <liang.z.li@xxxxxxxxx>

Add a new feature bit, VIRTIO_BALLOON_F_CHUNK_TRANSFER. Please check
the implementation patch commit for details about this feature.

Signed-off-by: Liang Li <liang.z.li@xxxxxxxxx>
Signed-off-by: Wei Wang <wei.w.wang@xxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Cc: Amit Shah <amit.shah@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Liang Li <liliang324@xxxxxxxxx>
Cc: Wei Wang <wei.w.wang@xxxxxxxxx>
---
 include/uapi/linux/virtio_balloon.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h
index 343d7dd..ed627b2 100644
--- a/include/uapi/linux/virtio_balloon.h
+++ b/include/uapi/linux/virtio_balloon.h
@@ -34,10 +34,14 @@
 #define VIRTIO_BALLOON_F_MUST_TELL_HOST	0 /* Tell before reclaiming pages */
 #define VIRTIO_BALLOON_F_STATS_VQ	1 /* Memory Stats virtqueue */
 #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM	2 /* Deflate balloon on OOM */
+#define VIRTIO_BALLOON_F_CHUNK_TRANSFER	3 /* Transfer pages in chunks */
 
 /* Size of a PFN in the balloon interface. */
 #define VIRTIO_BALLOON_PFN_SHIFT 12
 
+/* Shift to get a chunk size */
+#define VIRTIO_BALLOON_CHUNK_SIZE_SHIFT 12
+
 struct virtio_balloon_config {
 	/* Number of pages host wants Guest to give up. */
 	__u32 num_pages;
@@ -82,4 +86,12 @@ struct virtio_balloon_stat {
 	__virtio64 val;
 } __attribute__((packed));
 
+/* Response header structure */
+struct virtio_balloon_resp_hdr {
+	u8 cmd;
+	u8 flag;
+	__le16 id; /* cmd id */
+	__le32 data_len; /* Payload len in bytes */
+};
+
 #endif /* _LINUX_VIRTIO_BALLOON_H */
-- 
2.7.4