linux-kernel - Re: [PATCH 0/7] arm64/boot: Enable EL2 requirements for FEAT

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Message-ID: <20250102160402.GB3990035-robh@kernel.org>
Date: Thu, 2 Jan 2025 10:04:02 -0600
From: Rob Herring <robh@...nel.org>
To: Anshuman Khandual <anshuman.khandual@....com>
Cc: linux-arm-kernel@...ts.infradead.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Mark Rutland <mark.rutland@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Jonathan Corbet <corbet@....net>,
	Eric Auger <eric.auger@...hat.com>, kvmarm@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9

On Fri, Dec 20, 2024 at 12:52:33PM +0530, Anshuman Khandual wrote:
> This series adds fine grained trap control in EL2 required for FEAT_PMUv3p9
> registers like PMICNTR_EL0, PMICFILTR_EL0, and PMUACR_EL1 which are already
> being used in the kernel. This is required to prevent their EL1 access trap
> into EL2.
> 
> PMZR_EL0 register trap control i.e HDFGWTR2_EL2.nPMZR_EL0 remains unchanged
> for now as it does not get accessed in the kernel, and there is no plan for
> its access from user space.
> 
> I have taken the liberty to pick up all the review tags for patches related
> to tools sysreg update from the KVM FGT2 V2 patch series posted earlier.
> 
> https://lore.kernel.org/all/20241210055311.780688-1-anshuman.khandual@arm.com/
> 
> Rob had earler mentioned about FEAT_FGT2 based trap control requirement for
> FEAT_PMUv3p9 registers that are currently being used in kernel. The context
> can be found here.
> 
> https://lore.kernel.org/all/20241216234251.GA629562-robh@kernel.org/
> 
> This series is based on v6.13-rc3
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Ryan Roberts <ryan.roberts@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Mark Brown <robh@...nel.org>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Oliver Upton <oliver.upton@...ux.dev>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Eric Auger <eric.auger@...hat.com>
> Cc: kvmarm@...ts.linux.dev
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> 
> Anshuman Khandual (7):
>   arm64/sysreg: Update register fields for ID_AA64MMFR0_EL1
>   arm64/sysreg: Add register fields for HDFGRTR2_EL2
>   arm64/sysreg: Add register fields for HDFGWTR2_EL2
>   arm64/sysreg: Add register fields for HFGITR2_EL2
>   arm64/sysreg: Add register fields for HFGRTR2_EL2
>   arm64/sysreg: Add register fields for HFGWTR2_EL2
>   arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9

In case it is not clear, this series should be applied to 6.13 as the 2 
PMUv3p9 features already landed in 6.13 (per counter EL0 control) and 
6.12 (ICNTR). 

Rob