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Tag config space fields as having virtio endian-ness.
Signed-off-by: Michael S. Tsirkin <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Reviewed-by: Stefano Garzarella <[email protected]>
Reviewed-by: Stefano Garzarella <[email protected]>
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In commit 88c85538, "virtio-blk: add discard and write zeroes features
to specification" (https://github.com/oasis-tcs/virtio-spec), the virtio
block specification has been extended to add VIRTIO_BLK_T_DISCARD and
VIRTIO_BLK_T_WRITE_ZEROES commands. This patch enables support for
discard and write zeroes in the virtio-blk driver when the device
advertises the corresponding features, VIRTIO_BLK_F_DISCARD and
VIRTIO_BLK_F_WRITE_ZEROES.
Signed-off-by: Changpeng Liu <[email protected]>
Signed-off-by: Daniel Verkamp <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
Reviewed-by: Stefan Hajnoczi <[email protected]>
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Latest virtio spec says the feature bit name is VIRTIO_BLK_F_FLUSH,
VIRTIO_BLK_F_WCE is the legacy name. virtio blk header says exactly the
reverse - fix that and update driver code to match.
Cc: Paolo Bonzini <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
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Fix up comment to match virtio 1.0 logic:
virtio_blk_outhdr isn't the first elements anymore,
the only requirement is that it comes first in
the s/g list.
Signed-off-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
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Now that QEmu reuses linux virtio headers, we noticed
a typo in the exported virtio block header. Fix it up.
Signed-off-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
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This allows modern implementations to ensure they don't use legacy
feature bits or SCSI commands (which are not used in v1.0 non-legacy).
Signed-off-by: Rusty Russell <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
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Based on patch by Cornelia Huck.
Note: for consistency, and to avoid sparse errors,
convert all fields, even those no longer in use
for virtio v1.0.
Signed-off-by: Cornelia Huck <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
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Current virtio-blk spec only supports one virtual queue for transfering
data between VM and host, and inside VM all kinds of operations on
the virtual queue needs to hold one lock, so cause below problems:
- bad scalability
- bad throughput
This patch requests to introduce feature of VIRTIO_BLK_F_MQ
so that more than one virtual queues can be used to virtio-blk
device, then above problems can be solved or eased.
Signed-off-by: Ming Lei <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
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Signed-off-by: David Howells <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Acked-by: Michael Kerrisk <[email protected]>
Acked-by: Paul E. McKenney <[email protected]>
Acked-by: Dave Jones <[email protected]>
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