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

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Message-ID: <86zfeecnog.wl-maz@kernel.org>
Date: Wed, 11 Jun 2025 16:17:51 +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 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,

	M.

-- 
Without deviation from the norm, progress is not possible.