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virtio-blk: add DISCARD and WRITE_ZEROES features

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This patch adds the support of DISCARD and WRITE_ZEROES commands,
that have been introduced in the virtio-blk protocol to have
better performance when using SSD backend.

We support only one segment per request since multiple segments
are not widely used and there are no userspace APIs that allow
applications to submit multiple segments in a single call.

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20190221103314.58500-7-sgarzare@redhat.com
Message-Id: <20190221103314.58500-7-sgarzare@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefano Garzarella 2019-02-21 11:33:10 +01:00 • committed by Stefan Hajnoczi
parent 20764be042
commit 37b06f8d46
2 changed files with 186 additions and 0 deletions
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2
include/hw/virtio/virtio-blk.h
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@ -38,6 +38,8 @@ struct VirtIOBlkConf
uint32_t request_merging;
uint16_t num_queues;
uint16_t queue_size;
uint32_t max_discard_sectors;
uint32_t max_write_zeroes_sectors;
};
struct VirtIOBlockDataPlane;