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From: Oliver Upton <oliver.upton@linux.dev>
To: kvmarm@lists.linux.dev,
	Marc Zyngier <maz@kernel.org>,
	Reiji Watanabe <reijiw@google.com>
Cc: Oliver Upton <oliver.upton@linux.dev>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Will Deacon <will@kernel.org>,
	Ricardo Koller <ricarkol@google.com>,
	stable@vger.kernel.org,
	James Morse <james.morse@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Jing Zhang <jingzhangos@google.com>,
	Raghavendra Rao Anata <rananta@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	linux-arm-kernel@lists.infradead.org,
	kvm@vger.kernel.org
Subject: Re: [PATCH v2 1/2] KVM: arm64: PMU: Fix GET_ONE_REG for vPMC regs to return the current value
Date: Mon, 13 Mar 2023 19:02:54 +0000
Message-Id: <167873416494.193819.9004317354249564385.b4-ty@linux.dev>
In-Reply-To: <20230313033208.1475499-1-reijiw@google.com>
References: <20230313033208.1475499-1-reijiw@google.com>
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On Sun, 12 Mar 2023 20:32:08 -0700, Reiji Watanabe wrote:
> Have KVM_GET_ONE_REG for vPMU counter (vPMC) registers (PMCCNTR_EL0
> and PMEVCNTR<n>_EL0) return the sum of the register value in the sysreg
> file and the current perf event counter value.
> 
> Values of vPMC registers are saved in sysreg files on certain occasions.
> These saved values don't represent the current values of the vPMC
> registers if the perf events for the vPMCs count events after the save.
> The current values of those registers are the sum of the sysreg file
> value and the current perf event counter value.  But, when userspace
> reads those registers (using KVM_GET_ONE_REG), KVM returns the sysreg
> file value to userspace (not the sum value).
> 
> [...]

Applied to kvmarm/fixes, thanks!

[1/2] KVM: arm64: PMU: Fix GET_ONE_REG for vPMC regs to return the current value
      https://git.kernel.org/kvmarm/kvmarm/c/9228b26194d1

--
Best,
Oliver