linux-kernel - Re: [PATCH V2 0/7] arm64/boot: Enable EL2 requirements for FEAT

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Message-ID: <7176be0c-030d-4c2c-9a9d-7b69c2eabe40@arm.com>
Date: Mon, 17 Feb 2025 11:12:53 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: 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>, Mark Brown <robh@...nel.org>,
 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,
 Rob Herring <robh@...nel.org>
Subject: Re: [PATCH V2 0/7] arm64/boot: Enable EL2 requirements for
 FEAT_PMUv3p9

On 2/3/25 10:38, 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 v6.14-rc1
> 
> Changes in V2:
> 
> - Rebased on v6.14-rc1
> - Updated tools sysreg patches with latest DDI0601 2024-12 definitions
> - Updated document version as DDI0601 2024-12 in all commit messages
> - Added latest tags from Rob Herring for the last patch
> 

Hello Catalin/Will/Rob,

I hope this series looks okay. Please do let me know in case anything
needs changing. Thank you.

- Anshuman

> Changes in V1:
> 
> https://lore.kernel.org/all/20241220072240.1003352-1-anshuman.khandual@arm.com/
> 
> 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
> 
>  Documentation/arch/arm64/booting.rst |  18 +++++
>  arch/arm64/include/asm/el2_setup.h   |  25 +++++++
>  arch/arm64/tools/sysreg              | 103 +++++++++++++++++++++++++++
>  3 files changed, 146 insertions(+)
>