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Date: Wed, 21 Dec 2016 14:52:25 +0800 From: Liang Li <liang.z.li@...el.com> To: kvm@...r.kernel.org Cc: virtio-dev@...ts.oasis-open.org, qemu-devel@...gnu.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org, amit.shah@...hat.com, dave.hansen@...el.com, cornelia.huck@...ibm.com, pbonzini@...hat.com, mst@...hat.com, david@...hat.com, aarcange@...hat.com, dgilbert@...hat.com, quintela@...hat.com, Liang Li <liang.z.li@...el.com> Subject: [PATCH v6 kernel 2/5] virtio-balloon: define new feature bit and head struct Add a new feature which supports sending the page information with range array. The current implementation uses PFNs array, which is not very efficient. Using ranges can improve the performance of inflating/deflating significantly. Signed-off-by: Liang Li <liang.z.li@...el.com> Cc: Michael S. Tsirkin <mst@...hat.com> Cc: Paolo Bonzini <pbonzini@...hat.com> Cc: Cornelia Huck <cornelia.huck@...ibm.com> Cc: Amit Shah <amit.shah@...hat.com> Cc: Dave Hansen <dave.hansen@...el.com> Cc: Andrea Arcangeli <aarcange@...hat.com> Cc: David Hildenbrand <david@...hat.com> --- 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..2f850bf 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_PAGE_RANGE 3 /* Send page info with ranges */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12 +/* Bits width for the length of the pfn range */ +#define VIRTIO_BALLOON_NR_PFN_BITS 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 { + __le64 cmd : 8; /* Distinguish different requests type */ + __le64 flag: 8; /* Mark status for a specific request type */ + __le64 id : 16; /* Distinguish requests of a specific type */ + __le64 data_len: 32; /* Length of the following data, in bytes */ +}; + #endif /* _LINUX_VIRTIO_BALLOON_H */ -- 1.9.1
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