On 02/22/2018 04:39 PM, Cornelia Huck wrote:
> vfio-ccw only supports command mode for channel programs, not transport
> mode. User space is supposed to already take care of that and pass us
> command-mode ORBs only, but better make sure and return an error to
> the caller instead of trying to process tcws as ccws.
>
> Signed-off-by: Cornelia Huck <cohuck@xxxxxxxxxx>
Acked-by: Halil Pasic <pasic@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/s390/cio/vfio_ccw_fsm.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c
> index c30420c517b1..ff6963ad6e39 100644
> --- a/drivers/s390/cio/vfio_ccw_fsm.c
> +++ b/drivers/s390/cio/vfio_ccw_fsm.c
> @@ -124,6 +124,11 @@ static void fsm_io_request(struct vfio_ccw_private *private,
> if (scsw->cmd.fctl & SCSW_FCTL_START_FUNC) {
> orb = (union orb *)io_region->orb_area;
>
> + /* Don't try to build a cp if transport mode is specified. */
> + if (orb->tm.b) {
> + io_region->ret_code = -EOPNOTSUPP;
I guess now we communicate this as appropriately as possible.
> + goto err_out;
> + }
> io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev),
> orb);
> if (io_region->ret_code)
>
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