Re: [PATCH v8 0/7] KVM: arm64: PMU: Use multiple host PMUs

[Oliver Upton]

On Mon, Jul 06, 2026 at 07:03:23PM +0900, Akihiko Odaki wrote:
> Akihiko Odaki (7):
>       KVM: arm64: Disallow vPMU when pPMUs do not cover all CPUs
>       KVM: arm64: PMU: Protect the list of PMUs with RCU
>       KVM: arm64: PMU: Pass the pPMU to kvm_map_pmu_event()
>       KVM: arm64: PMU: Pass the target CPU to kvm_pmu_probe_armpmu()
>       KVM: arm64: PMU: Implement fixed-counters-only emulation
>       KVM: arm64: PMU: Introduce FIXED_COUNTERS_ONLY
>       KVM: arm64: selftests: Test PMU_V3_FIXED_COUNTERS_ONLY

Thanks for respinning the series, I left some comments. I'd really like
to get this feature picked up, hope you have cycles to work on it soon.

FWIW, we're considering adding a new vCPU feature flag to deprecate all
the ugliness of the old PMUv3 UAPI. I'm tempted to say that the
FIXED_COUNTERS_ONLY feature is conditioned on the new feature flag...

https://lore.kernel.org/kvmarm/20260702190421.420992-1-congkai@xxxxxxxxxx/

Thanks,
Oliver