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| author |   Cornelia Huck <cohuck@redhat.com> | 2018-02-22 15:35:43 +0100 |
|---|---|---|
| committer | Cornelia Huck <cohuck@redhat.com> | 2018-03-01 17:35:50 +0100 |
| commit | 9851bc77e62499957567e7c39a5beba7d6de6296 (patch) | |
| tree | 97863d73226b6dc397ad2e7527b5d61e0f6ba889 /drivers/s390/cio/vfio_ccw_fsm.c | |
| parent | vfio-ccw: update documentation (diff) | |
| download | linux-dev-9851bc77e62499957567e7c39a5beba7d6de6296.tar.xz linux-dev-9851bc77e62499957567e7c39a5beba7d6de6296.zip | |
vfio-ccw: fence off transport mode
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>
Diffstat (limited to 'drivers/s390/cio/vfio_ccw_fsm.c')
| -rw-r--r-- | drivers/s390/cio/vfio_ccw_fsm.c | 5 |
1 files changed, 5 insertions, 0 deletions
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; + goto err_out; + } io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev), orb); if (io_region->ret_code) |