[PATCH 0/1] vfio-ccw: Fix garbage sense data on I/O error

[Eric Farman <farman@linux.ibm.com>]

Hi Conny,

Per our offline discussion, here's a fix for the error when a guest
issues "dasdfmt -M quick". It basically reverts commit 334e76850bbb
("vfio/ccw: update sense data if a unit check is pending")
and modifies the check that builds sense data in the TSCH handler.

I opted to NOT disable PMCW.CSENSE, because doing so prevents
vfio-ccw devices from coming online at all (didn't pursue deep
enough to explain why). Turning it off in reaction to a unit
check (in this now-reverted codepath) works, but only because of
the corresponding PMCW.CSENSE check in the TSCH code.

I don't know if anything is needed for the (unaltered) ECW data
that commit b498484ed49a ("s390x/css: sense data endianness")
addressed for the copied sense_data bytes, but figure we can
use this as a starting point. Thoughts?

Eric Farman (1):
  vfio-ccw: Keep passthrough sense data intact

 hw/s390x/css.c | 3 ++-
 hw/vfio/ccw.c  | 6 ------
 2 files changed, 2 insertions(+), 7 deletions(-)

-- 
2.25.1