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    Subject[PATCH 4.14 452/496] vfio-ccw: fence off transport mode
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Cornelia Huck <cohuck@redhat.com>

    [ Upstream commit 9851bc77e62499957567e7c39a5beba7d6de6296 ]

    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.

    Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
    Acked-by: Halil Pasic <pasic@linux.vnet.ibm.com>
    Signed-off-by: Cornelia Huck <cohuck@redhat.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/s390/cio/vfio_ccw_fsm.c | 5 +++++
    1 file changed, 5 insertions(+)

    --- a/drivers/s390/cio/vfio_ccw_fsm.c
    +++ b/drivers/s390/cio/vfio_ccw_fsm.c
    @@ -129,6 +129,11 @@ static void fsm_io_request(struct vfio_c
    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;
    + goto err_out;
    + }
    io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev),
    orb);
    if (io_region->ret_code)

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