linux-kernel - Re: [PATCH 2/6] arm64/Kconfig: add LSUI Kconfig

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Message-ID: <aEnC6img102ZygDy@e129823.arm.com>
Date: Wed, 11 Jun 2025 18:54:50 +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, ardb@...nel.org, frederic@...nel.org,
	james.morse@....com, joey.gouly@....com,
	scott@...amperecomputing.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] arm64/Kconfig: add LSUI Kconfig

Hi Marc,

> On Wed, 11 Jun 2025 11:49:12 +0100,
> Yeoreum Yun <yeoreum.yun@....com> wrote:
> >
> > Since Armv9.6, FEAT_LSUI supplies the load/store instructions for
> > previleged level to access to access user memory without clearing
> > PSTATE.PAN bit.
> > It's enough to add CONFIG_AS_HAS_LSUI only because the code for LUSI uses
> > indiviual `.arch_extension` entries.
> >
> > Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
> > ---
> >  arch/arm64/Kconfig | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> > index 55fc331af337..20f360eef2ac 100644
> > --- a/arch/arm64/Kconfig
> > +++ b/arch/arm64/Kconfig
> > @@ -2237,6 +2237,13 @@ config ARM64_GCS
> >
> >  endmenu # "v9.4 architectural features"
> >
> > +menu "v9.6 architectural features"
> > +
> > +config AS_HAS_LSUI
> > +	def_bool $(as-instr,.arch_extension lsui)
> > +
> > +endmenu # "v9.6 architectural features"
> > +
> >  config ARM64_SVE
> >  	bool "ARM Scalable Vector Extension support"
> >  	default y
> > @@ -2498,4 +2505,3 @@ endmenu # "CPU Power Management"
> >  source "drivers/acpi/Kconfig"
> >
> >  source "arch/arm64/kvm/Kconfig"
> > -
>
> Can you please document what toolchain versions have support for this?
>
> Thanks,

Okay. But here with comment or Is any other suggested place for this?

Thanks.

--
Sincerely,
Yeoreum Yun