linux-kernel - Re: [PATCH v5 0/5] KVM: arm64: PMU: Fix SET_ONE

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Message-Id: <174224155547.1588441.3490436622132208645.b4-ty@linux.dev>
Date: Mon, 17 Mar 2025 13:01:07 -0700
From: Oliver Upton <oliver.upton@...ux.dev>
To: Marc Zyngier <maz@...nel.org>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Andrew Jones <andrew.jones@...ux.dev>,
	Akihiko Odaki <akihiko.odaki@...nix.com>
Cc: Oliver Upton <oliver.upton@...ux.dev>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	devel@...nix.com,
	stable@...r.kernel.org
Subject: Re: [PATCH v5 0/5] KVM: arm64: PMU: Fix SET_ONE_REG for vPMC regs

On Sat, 15 Mar 2025 18:12:09 +0900, Akihiko Odaki wrote:
> Prepare vPMC registers for user-initiated changes after first run. This
> is important specifically for debugging Windows on QEMU with GDB; QEMU
> tries to write back all visible registers when resuming the VM execution
> with GDB, corrupting the PMU state. Windows always uses the PMU so this
> can cause adverse effects on that particular OS.
> 
> This series also contains patch "KVM: arm64: PMU: Set raw values from
> user to PM{C,I}NTEN{SET,CLR}, PMOVS{SET,CLR}", which reverts semantic
> changes made for the mentioned registers in the past. It is necessary
> to migrate the PMU state properly on Firecracker, QEMU, and crosvm.
> 
> [...]

Squashed in a fix for CONFIG_HW_PERF_EVENTS=n build.

Applied to next, thanks!

[1/5] KVM: arm64: PMU: Set raw values from user to PM{C,I}NTEN{SET,CLR}, PMOVS{SET,CLR}
      https://git.kernel.org/kvmarm/kvmarm/c/f2aeb7bbd574
[2/5] KVM: arm64: PMU: Assume PMU presence in pmu-emul.c
      https://git.kernel.org/kvmarm/kvmarm/c/be5ccac3f15e
[3/5] KVM: arm64: PMU: Fix SET_ONE_REG for vPMC regs
      https://git.kernel.org/kvmarm/kvmarm/c/64074ca8ca92
[4/5] KVM: arm64: PMU: Reload when user modifies registers
      https://git.kernel.org/kvmarm/kvmarm/c/1db4aaa05589
[5/5] KVM: arm64: PMU: Reload when resetting
      https://git.kernel.org/kvmarm/kvmarm/c/fe53538069bb

--
Best,
Oliver