vfio/ccw: allow non-zero storage keys
Currently, vfio-ccw copies the ORB from the io_region to the channel_program struct being built. It then adjusts various pieces of that ORB to the values needed to be used by the SSCH issued by vfio-ccw in the host. This includes setting the subchannel key to the default, presumably because Linux doesn't do anything with non-zero storage keys itself. But it seems wrong to convert every I/O to the default key if the guest itself requested a non-zero subchannel (access) key. Any channel program that sets a non-zero key would expect the same key returned in the SCSW of the IRB, not zero, so best to allow that to occur unimpeded. Signed-off-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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