linux-kernel - Re: [PATCH V4] arm64: errata: Workaround possible Cortex-A715 [ESR|FAR]

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Date:   Fri,  6 Jan 2023 17:50:35 +0000
From:   Will Deacon <will@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-kernel@...r.kernel.org, catalin.marinas@....com
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        Jonathan Corbet <corbet@....net>, suzuki.poulose@....com,
        linux-doc@...r.kernel.org, lukas.bulwahn@...il.com,
        Mark Rutland <mark.rutland@....com>, james.morse@....com
Subject: Re: [PATCH V4] arm64: errata: Workaround possible Cortex-A715 [ESR|FAR]_ELx corruption

On Mon, 2 Jan 2023 11:46:51 +0530, Anshuman Khandual wrote:
> If a Cortex-A715 cpu sees a page mapping permissions change from executable
> to non-executable, it may corrupt the ESR_ELx and FAR_ELx registers, on the
> next instruction abort caused by permission fault.
> 
> Only user-space does executable to non-executable permission transition via
> mprotect() system call which calls ptep_modify_prot_start() and ptep_modify
> _prot_commit() helpers, while changing the page mapping. The platform code
> can override these helpers via __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION.
> 
> [...]

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

[1/1] arm64: errata: Workaround possible Cortex-A715 [ESR|FAR]_ELx corruption
      https://git.kernel.org/arm64/c/5db568e748f6

Cheers,
-- 
Will

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