On Tue, Jul 07, 2026 at 08:58:50AM +0100, Marc Zyngier wrote: > On Mon, 06 Jul 2026 19:28:20 +0100, > Oliver Upton <[email protected]> wrote: > > > > 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... > > It'd be good to have a strawman proposal on the list if we are going > to change add a new API, specially if this is likely to gate new code. >
Patch 1 [*] of the series I linked does exactly this, no? Needs some attention like a KVM_CAP to make the bit discoverable by the VMM but gets the general idea across. [*]: https://lore.kernel.org/kvmarm/[email protected]/ Thanks, Oliver
