[kvm-unit-tests,v2,0/3] arm: pmu: Fixes for bare metal

Message

Ricardo Koller Aug. 3, 2022, 6:23 p.m. UTC

There are some tests that fail when running on bare metal (including a
passthrough prototype).  There are three issues with the tests.  The
first one is that there are some missing isb()'s between enabling event
counting and the actual counting. This wasn't an issue on KVM as
trapping on registers served as context synchronization events. The
second issue is that some tests assume that registers reset to 0.  And
finally, the third issue is that overflowing the low counter of a
chained event sets the overflow flag in PMVOS and some tests fail by
checking for it not being set.

Addressed all comments from the previous version:
- added some isb()'s as suggested by Alexandru.
- fixed a couple of confusing comments (Alexandru).
- check for overflow in the low counter in the interrupt_overflow test (Marc).

Thanks!
Ricardo

Ricardo Koller (3):
  arm: pmu: Add missing isb()'s after sys register writing
  arm: pmu: Reset the pmu registers before starting some tests
  arm: pmu: Check for overflow in the low counter in chained counters
    tests

 arm/pmu.c | 55 ++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 38 insertions(+), 17 deletions(-)