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