[kvm-unit-tests PATCH v2 0/5] s390x: Dirty cc before executing tested instructions

Janosch Frank
2024-01-31T07:44:57Z

A recent s390 KVM fixpatch [1] showed us that checking the cc is not
enough when emulation code forgets to set the cc. There might just be
the correct cc in the PSW which would make the cc check succeed.

This series intentionally dirties the cc for sigp, uvc, some io
instructions and sclp to make cc setting errors more apparent. I had a
cursory look through the tested instructions and those are the most
prominent ones with defined cc values.

Since the issue appeared in PQAP my AP test series is now dependent on
this series.

[1] https://lore.kernel.org/kvm/20231201181657.1614645-1-farman@linux.ibm.com/

v2:
* Moved from spm to tmll (thanks Nina)

Janosch Frank (5):
lib: s390x: sigp: Dirty CC before sigp execution
lib: s390x: uv: Dirty CC before uvc execution
lib: s390x: css: Dirty CC before css instructions
s390x: mvpg: Dirty CC before mvpg execution
s390x: sclp: Dirty CC before sclp execution

lib/s390x/asm/sigp.h | 6 +++++-
lib/s390x/asm/uv.h | 4 +++-
lib/s390x/css.h | 16 ++++++++++++----
s390x/mvpg.c | 6 ++++--
s390x/sclp.c | 5 ++++-
5 files changed, 28 insertions(+), 9 deletions(-)

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2.40.1