On Thu, 1 Mar 2018 15:51:05 +0100
Halil Pasic <pasic@xxxxxxxxxxxxxxxxxx> wrote:
> 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>
Thanks!
>
> > ---
> > 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.
Yes. We certainly only want to return an error to user space; it is
their responsibility to correctly reflect that to the guest (and even
more their responsibility to not present us with a transport orb in the
first place...)
>
> > + goto err_out;
> > + }
> > io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev),
> > orb);
> > if (io_region->ret_code)
> >
>
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