From: Colton Lewis <coltonlewis@google.com>
To: James Clark <james.clark@linaro.org>
Cc: Colton Lewis <coltonlewis@google.com>,
Marc Zyngier <maz@kernel.org>, Oliver Upton <oupton@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Fuad Tabba <fuad.tabba@linux.dev>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Zide Chen <zide.chen@intel.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>,
Mingwei Zhang <mizhang@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Russell King <linux@armlinux.org.uk>,
Shuah Khan <shuah@kernel.org>,
linux-perf-users@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v9 20/22] KVM: arm64: Add vCPU device attr to partition the PMU
Date: Thu, 1 Oct 2026 21:21:00 +0000 [thread overview]
Message-ID: <20261001212100.2035442-1-coltonlewis@google.com> (raw)
In-Reply-To: <56d86280-fcea-4d2d-b6b9-b47449f3408d@linaro.org>
Hi James,
On Wed, Sep 30, 2026 at 04:27:27PM +0100, James Clark wrote:
> > @@ -77,7 +80,9 @@ Parameters: in:imaan address of a u32 value (N)
> > Returns:
> > ======= ====================================================
> > -EBUSY PMUv3 already initialized, or a vCPU has already run
> > - -EINVAL No PMUv3 explicitly selected, or value of N out of range
> > + -EINVAL No PMUv3 explicitly selected, or value of N out of
> > + range (>= max_counters when partitioning is
> > + enabled)
>
> "No PMUv3 explicitly selected, or value of N > max_counters, or N >
> max_counters - 1 when partitioning is enabled".
>
> That might be clearer, otherwise it seems like max_counters being relevant
> to "out of range" only applies to when partitioning is enabled, not that
> it's max_counters all the time but one is -1.
Agreed, that reads much better. I will update it to your phrasing in
v10.
Thanks,
Colton
next prev parent reply other threads:[~2026-10-01 21:21 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-24 17:29 [PATCH v9 00/22] ARM64 PMU Partitioning Colton Lewis
2026-09-24 17:29 ` [PATCH v9 01/22] arm64: cpufeature: Add cpucap for HPMN0 Colton Lewis
2026-09-24 17:29 ` [PATCH v9 02/22] KVM: arm64: Reorganize PMU includes Colton Lewis
2026-09-24 17:29 ` [PATCH v9 03/22] KVM: arm64: Reorganize PMU functions Colton Lewis
2026-09-24 17:29 ` [PATCH v9 04/22] perf: arm_pmuv3: Generalize counter bitmasks Colton Lewis
2026-09-24 17:29 ` [PATCH v9 05/22] perf: arm_pmuv3: Move counter allocation mask to per-CPU struct pmu_hw_events Colton Lewis
2026-09-24 17:29 ` [PATCH v9 06/22] perf: arm_pmuv3: Check cntr_mask before using pmccntr Colton Lewis
2026-09-24 17:29 ` [PATCH v9 07/22] perf: arm_pmuv3: Allocate counter indices from high to low Colton Lewis
2026-09-24 17:29 ` [PATCH v9 08/22] KVM: arm64: Add initial scaffolding for Partitioned PMU Colton Lewis
2026-09-24 17:29 ` [PATCH v9 09/22] KVM: arm64: Set up FGT " Colton Lewis
2026-09-24 17:29 ` [PATCH v9 10/22] KVM: arm64: Add Partitioned PMU register trap handlers Colton Lewis
2026-09-24 17:29 ` [PATCH v9 11/22] KVM: arm64: Set up MDCR_EL2 to handle a Partitioned PMU Colton Lewis
2026-09-24 17:29 ` [PATCH v9 12/22] KVM: arm64: Context swap Partitioned PMU guest registers Colton Lewis
2026-09-24 17:29 ` [PATCH v9 13/22] KVM: arm64: Enforce PMU event filter at vcpu_load() Colton Lewis
2026-09-24 17:29 ` [PATCH v9 14/22] perf: Add perf_pmu_resched_update() Colton Lewis
2026-09-24 17:29 ` [PATCH v9 15/22] KVM: arm64: Allow kvm_vcpu_pmu_resync_el0() to resync filters in process context Colton Lewis
2026-09-24 17:29 ` [PATCH v9 16/22] KVM: arm64: Apply dynamic guest counter reservations Colton Lewis
2026-09-30 15:28 ` James Clark
2026-10-01 21:33 ` Colton Lewis
2026-09-24 17:29 ` [PATCH v9 17/22] KVM: arm64: Implement lazy PMU context swaps Colton Lewis
2026-09-24 17:29 ` [PATCH v9 18/22] perf: arm_pmuv3: Handle IRQs for Partitioned PMU guest counters Colton Lewis
2026-09-24 17:29 ` [PATCH v9 19/22] KVM: arm64: Detect overflows for the Partitioned PMU Colton Lewis
2026-09-24 17:29 ` [PATCH v9 20/22] KVM: arm64: Add vCPU device attr to partition the PMU Colton Lewis
2026-09-30 15:27 ` James Clark
2026-10-01 21:21 ` Colton Lewis [this message]
2026-09-24 17:29 ` [PATCH v9 21/22] KVM: selftests: Add find_bit to KVM library Colton Lewis
2026-09-24 17:29 ` [PATCH v9 22/22] KVM: arm64: selftests: Add test case for Partitioned PMU Colton Lewis
2026-09-30 15:25 ` [PATCH v9 00/22] ARM64 PMU Partitioning James Clark
2026-10-01 21:33 ` Colton Lewis
2026-09-30 15:26 ` James Clark
2026-10-01 21:33 ` Colton Lewis
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