linux-kernel - Re: [PATCH V2] arm64/mm: Drop wrong writes into TCR2

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Message-Id: <175164396550.1190820.4438826795121262303.b4-ty@kernel.org>
Date: Fri,  4 Jul 2025 18:44:08 +0100
From: Will Deacon <will@...nel.org>
To: linux-arm-kernel@...ts.infradead.org,
	Anshuman Khandual <anshuman.khandual@....com>
Cc: catalin.marinas@....com,
	kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Marc Zyngier <maz@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] arm64/mm: Drop wrong writes into TCR2_EL1

On Fri, 04 Jul 2025 12:08:12 +0530, Anshuman Khandual wrote:
> Register X0 contains PIE_E1_ASM and should not be written into REG_TCR2_EL1
> which could have an adverse impact otherwise. This has remained undetected
> till now probably because current value for PIE_E1_ASM (0xcc880e0ac0800000)
> clears TCR2_EL1 which again gets set subsequently with 'tcr2' after testing
> for FEAT_TCR2.
> 
> Drop this unwarranted 'msr' which is a stray change from an earlier commit.
> This line got re-introduced when rebasing on top of the commit 926b66e2ebc8
> ("arm64: setup: name 'tcr2' register").
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64/mm: Drop wrong writes into TCR2_EL1
      https://git.kernel.org/arm64/c/9dd175749341

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev