scsi: virtio_scsi: implement request batching
Adding the command and kicking the virtqueue so far was done one after another. Make the kick optional, so that we can take into account SCMD_LAST. We also need a commit_rqs callback to kick the device if blk-mq aborts the submission before the last request is reached. Suggested-by:Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> Reviewed-by:
Hannes Reinecke <hare@suse.com> Reviewed-by:
Ming Lei <ming.lei@redhat.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com>
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