linux-kernel - Re: [PATCH v2 11/12] KVM: arm64: Refine PMU defines for number of counters

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Date: Thu, 27 Jun 2024 11:54:18 +0100
From: Marc Zyngier <maz@...nel.org>
To: "Rob Herring (Arm)" <robh@...nel.org>
Cc: Russell King <linux@...linux.org.uk>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Will Deacon <will@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	James Clark <james.clark@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	kvmarm@...ts.linux.dev
Subject: Re: [PATCH v2 11/12] KVM: arm64: Refine PMU defines for number of counters

On Wed, 26 Jun 2024 23:32:35 +0100,
"Rob Herring (Arm)" <robh@...nel.org> wrote:
> 
> There are 2 defines for the number of PMU counters:
> ARMV8_PMU_MAX_COUNTERS and ARMPMU_MAX_HWEVENTS. Both are the same
> currently, but Armv9.4/8.9 increases the number of possible counters
> from 32 to 33. With this change, the maximum number of counters will
> differ for KVM's PMU emulation which is PMUv3.4. Give KVM PMU emulation
> its own define to decouple it from the rest of the kernel's number PMU
> counters.
> 
> The VHE PMU code needs to match the PMU driver, so switch it to use
> ARMPMU_MAX_HWEVENTS instead.
>
> Acked-by: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>

Reviewed-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.