linux-kernel - [RFC 0/3] KVM/ARM: Misc PMU fixes

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Date:   Wed,  4 Dec 2019 21:44:23 +0100
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com, maz@...nel.org,
        linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu
Cc:     james.morse@....com, andrew.murray@....com, suzuki.poulose@....com,
        drjones@...hat.com
Subject: [RFC 0/3] KVM/ARM: Misc PMU fixes

While writing new PMUv3 event counter KVM unit tests I found 3
things that do not seem to comply with the specification and at
least need to be confirmed.

Two are related to SW_INCR implementation: no check of the
PMCR.E bit, no support of 64b (CHAIN). From the spec,
I do not understand the SW_INCR behaves differently from
other events but I may be wrong.

The last minor thing is about the PMEVTYPER read-only bits.
On Seattle we have an 8.0 implementation which I understand
is supposed to implement only 10-bit evtCount field which is
not enforced.

Best Regards

Eric

This series can be found at:
https://github.com/eauger/qemu/tree/v5.4-pmu-kut-fixes-v1

Eric Auger (3):
  KVM: arm64: pmu: Don't increment SW_INCR if PMCR.E is unset
  KVM: arm64: pmu: Fix chained SW_INCR counters
  KVM: arm64: pmu: Enforce PMEVTYPER evtCount size

 arch/arm64/include/asm/perf_event.h |  5 ++++-
 arch/arm64/include/asm/sysreg.h     |  5 +++++
 arch/arm64/kernel/perf_event.c      |  2 +-
 arch/arm64/kvm/sys_regs.c           | 14 ++++++++++----
 virt/kvm/arm/pmu.c                  | 19 ++++++++++++++++++-
 5 files changed, 38 insertions(+), 7 deletions(-)

-- 
2.20.1