linux-kernel - Re: [PATCH 00/11] support SCTLR2

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Message-ID: <aJCvxN8wv62lgX91@e129823.arm.com>
Date: Mon, 4 Aug 2025 14:04:04 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: Marc Zyngier <maz@...nel.org>
Cc: catalin.marinas@....com, will@...nel.org, broonie@...nel.org,
	oliver.upton@...ux.dev, anshuman.khandual@....com, robh@...nel.org,
	james.morse@....com, mark.rutland@....com, joey.gouly@....com,
	ry111@...111.site, Dave.Martin@....com, ahmed.genidi@....com,
	kevin.brodsky@....com, scott@...amperecomputing.com, mbenes@...e.cz,
	james.clark@...aro.org, frederic@...nel.org, rafael@...nel.org,
	pavel@...nel.org, ryan.roberts@....com, suzuki.poulose@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, kvmarm@...ts.linux.dev
Subject: Re: [PATCH 00/11] support SCTLR2_ELx

Hi

> Yeoreum Yun <yeoreum.yun@....com> wrote:
> >
> > This series introduces initial support for the SCTLR2_ELx registers in Linux.
> > The feature is optional starting from ARMv8.8/ARMv9.3,
> > and becomes mandatory from ARMv8.9/ARMv9.4.
> >
> > Currently, Linux has no strict need to modify SCTLR2_ELx—
> > at least assuming that firmware initializes
> > these registers to reasonable defaults.
> >
> > However, several upcoming architectural features will require configuring
> > control bits in these registers.
> > Notable examples include FEAT_PAuth_LR and FEAT_CPA2.
> >
> > This series is based on v6.16 and probably KVM-safe but
> > Not tested yet:
> >   - nVHE boot.

Okay.

>
> "Probably" and "Not tested yet" are not exactly what we are looking
> for when looking at a series that adds support for a new architectural
> feature.
>
> Also, a lot of the KVM patches are redundant now that we do have
> FEAT_SCTLR2 support in KVM (see what has been merged for 6.17). You
> probably want to rebase on -rc1 once it is released, which should cut
> the series by half.
>

I didn't know that and I'll rebase on 6.17-rc1.

Thanks.

--
Sincerely,
Yeoreum Yun