arm64: KVM: Fix perf cycle counter support for VHE

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The kvm_vcpu_pmu_{read,write}_evtype_direct functions do not handle
the cycle counter use-case, this leads to inaccurate counts and a
WARN message when using perf with the cycle counter (-e cycle).

Let's fix this by adding a use case for pmccfiltr_el0.

Fixes: 39e3406a09 ("arm64: KVM: Avoid isb's by using direct pmxevtyper sysreg")
Reported-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

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Andrew Murray 2019-04-29 20:13:05 +01:00 • committed by Marc Zyngier

parent a9bf3130eb

commit 21137301de

1 changed files with 9 additions and 2 deletions

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arch/arm64/kvm/pmu.c

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