On 11/03/2015 14:19, Michael S. Tsirkin wrote:
> QEMU wants to use virtio scsi structures with
> a different VIRTIO_SCSI_CDB_SIZE/VIRTIO_SCSI_SENSE_SIZE,
> let's add ifdefs to allow overriding them.
>
> Keep the old defines under new names:
> VIRTIO_SCSI_CDB_DEFAULT_SIZE/VIRTIO_SCSI_SENSE_DEFAULT_SIZE,
> since that's what these values really are:
> defaults for cdb/sense size fields.
>
> Suggested-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
QEMU will then use a zero-element array instead of a flexible array
member. That's okay.
Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Paolo
> ---
> include/uapi/linux/virtio_scsi.h | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/include/uapi/linux/virtio_scsi.h b/include/uapi/linux/virtio_scsi.h
> index 42b9370..cc18ef8 100644
> --- a/include/uapi/linux/virtio_scsi.h
> +++ b/include/uapi/linux/virtio_scsi.h
> @@ -29,8 +29,16 @@
>
> #include <linux/virtio_types.h>
>
> -#define VIRTIO_SCSI_CDB_SIZE 32
> -#define VIRTIO_SCSI_SENSE_SIZE 96
> +/* Default values of the CDB and sense data size configuration fields */
> +#define VIRTIO_SCSI_CDB_DEFAULT_SIZE 32
> +#define VIRTIO_SCSI_SENSE_DEFAULT_SIZE 96
> +
> +#ifndef VIRTIO_SCSI_CDB_SIZE
> +#define VIRTIO_SCSI_CDB_SIZE VIRTIO_SCSI_CDB_DEFAULT_SIZE
> +#endif
> +#ifndef VIRTIO_SCSI_SENSE_SIZE
> +#define VIRTIO_SCSI_SENSE_SIZE VIRTIO_SCSI_SENSE_DEFAULT_SIZE
> +#endif
>
> /* SCSI command request, followed by data-out */
> struct virtio_scsi_cmd_req {
>
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