linux-kernel - Re: [PATCH RESEND v7 1/6] arm64: cpufeature: add FEAT

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Message-ID: <aMRGiF9Ez18tc4u9@arm.com>
Date: Fri, 12 Sep 2025 17:12:56 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Yeoreum Yun <yeoreum.yun@....com>
Cc: will@...nel.org, broonie@...nel.org, maz@...nel.org,
	oliver.upton@...ux.dev, joey.gouly@....com, james.morse@....com,
	ardb@...nel.org, scott@...amperecomputing.com,
	suzuki.poulose@....com, yuzenghui@...wei.com, mark.rutland@....com,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v7 1/6] arm64: cpufeature: add FEAT_LSUI

On Sat, Aug 16, 2025 at 04:19:24PM +0100, Yeoreum Yun wrote:
> Since Armv9.6, FEAT_LSUI supplies load/store instructions
> for privileged level to access user memory without clearing PSTATE.PAN bit.
> 
> Add LSUI feature so that the unprevilieged load/store instructions
> could be used when kernel accesses user memory without clearing PSTATE.PAN bit.

These two paragraphs are pretty much saying the same thing. Just replace
the second with something like "Add CPU feature detection for
FEAT_LSUI". No need to explain the PSTATE.PAN again.

> Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>