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

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Message-ID: <87ikl1foz9.wl-maz@kernel.org>
Date: Thu, 12 Jun 2025 07:33:46 +0100
From: Marc Zyngier <maz@...nel.org>
To: Yeoreum Yun <yeoreum.yun@....com>
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

On Wed, 11 Jun 2025 18:54:50 +0100,
Yeoreum Yun <yeoreum.yun@....com> wrote:
> 
> 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?

The help section in the Kconfig option you are introducing would be a
good start.

Thanks,

	M.

-- 
Jazz isn't dead. It just smells funny.