[PATCH 0/2] Fix vfio-ccw handling of TIC recursion

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Per the discussion [1] about a problem with how vfio-ccw calculates
the length of a channel program (specifically when using the
forthcoming QEMU BIOS code for DASD IPL), I present this fix.

Patch 1 fixes the problem, and is over-engineered
for readability sake.

Patch 2 takes the functions from Patch 1, and refactors the
existing code to make other areas a little easier to understand.
(I hope.)

I've been running fio for over 24 hours now, and have seen
zero hours.  Previously, I would have probably seen "a few"
errors by now, where prior to the original fix I would've seen
"many" errors.  Further tests are still ongoing.

[1] https://marc.info/?l=linux-s390&m=155063096321940&w=2

Eric Farman (2):
  s390/cio: Fix vfio-ccw handling of recursive TICs
  s390/cio: Use cpa range elsewhere within vfio-ccw

 drivers/s390/cio/vfio_ccw_cp.c | 55 ++++++++++++++++++++++++++++++++----------
 1 file changed, 42 insertions(+), 13 deletions(-)

-- 
2.16.4




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