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

[Alexandru Elisei <alexandru.elisei@arm.com>]

Hi,

I believe you're missing the updated email for the arm maintainer. Added it.

Thanks,
Alex

On Mon, Jul 18, 2022 at 08:49:07AM -0700, Ricardo Koller wrote:
> 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.
> 
> I believe the third fix also requires a KVM change, but would like to
> double check with others first.  The only reference I could find in the
> ARM ARM is the AArch64.IncrementEventCounter() pseudocode (DDI 0487H.a,
> J1.1.1 "aarch64/debug") that unconditionally sets the PMOVS bit on
> overflow.
> 
> 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: Remove checks for !overflow in chained counters tests
> 
>  arm/pmu.c | 34 +++++++++++++++++++++++-----------
>  1 file changed, 23 insertions(+), 11 deletions(-)
> 
> -- 
> 2.37.0.170.g444d1eabd0-goog
>