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From: Oliver Upton <oupton@kernel.org>
To: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Cc: Marc Zyngier <maz@kernel.org>, Joey Gouly <joey.gouly@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Kees Cook <kees@kernel.org>,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>,
	Shuah Khan <skhan@linuxfoundation.org>,
	linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
	devel@daynix.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v8 0/7] KVM: arm64: PMU: Use multiple host PMUs
Date: Mon, 6 Jul 2026 11:28:20 -0700	[thread overview]
Message-ID: <akvzxDwZbj_sZ4pI@kernel.org> (raw)
In-Reply-To: <20260706-hybrid-v8-0-de459617b59d@rsg.ci.i.u-tokyo.ac.jp>

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@amazon.com/

Thanks,
Oliver

      parent reply	other threads:[~2026-07-06 18:28 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-06 10:03 [PATCH v8 0/7] KVM: arm64: PMU: Use multiple host PMUs Akihiko Odaki
2026-07-06 10:03 ` [PATCH v8 1/7] KVM: arm64: Disallow vPMU when pPMUs do not cover all CPUs Akihiko Odaki
2026-07-06 17:04   ` Oliver Upton
2026-07-06 10:03 ` [PATCH v8 2/7] KVM: arm64: PMU: Protect the list of PMUs with RCU Akihiko Odaki
2026-07-06 10:03 ` [PATCH v8 3/7] KVM: arm64: PMU: Pass the pPMU to kvm_map_pmu_event() Akihiko Odaki
2026-07-06 10:03 ` [PATCH v8 4/7] KVM: arm64: PMU: Pass the target CPU to kvm_pmu_probe_armpmu() Akihiko Odaki
2026-07-06 10:03 ` [PATCH v8 5/7] KVM: arm64: PMU: Implement fixed-counters-only emulation Akihiko Odaki
2026-07-06 10:53   ` sashiko-bot
2026-07-06 18:23   ` Oliver Upton
2026-07-06 10:03 ` [PATCH v8 6/7] KVM: arm64: PMU: Introduce FIXED_COUNTERS_ONLY Akihiko Odaki
2026-07-06 11:13   ` sashiko-bot
2026-07-06 17:58   ` Oliver Upton
2026-07-06 10:03 ` [PATCH v8 7/7] KVM: arm64: selftests: Test PMU_V3_FIXED_COUNTERS_ONLY Akihiko Odaki
2026-07-06 18:28 ` Oliver Upton [this message]

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