I'm currently prototyping hsch()/csch() support for vfio-ccw, and
stumbled over this: We currently expect any I/O to be in command-mode,
but don't take care to actively reject transport-mode. This is not an
issue with QEMU (which rejects transport-mode ORBs before even the css
backend gets to it), but better play safe.

Should we want to support transport-mode in the future, we'll probably
need to introduce a capability for it that needs to be enabled by user

[I also still have the doc patch from some time ago queued. Let's see
if we'll collect more patches.]

Cornelia Huck (1):
  vfio-ccw: fence off transport mode

 drivers/s390/cio/vfio_ccw_fsm.c | 5 +++++
 1 file changed, 5 insertions(+)


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