linux-kernel - Re: [PATCH] arm64: Add the arm64.no32bit

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Message-ID: <7c0dd2f1-0b43-425e-8b0e-004760bed317@infradead.org>
Date: Tue, 6 Feb 2024 12:23:21 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Andrea della Porta <andrea.porta@...e.com>,
 Jonathan Corbet <corbet@....net>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64: Add the arm64.no32bit_el0 command line option

Hi--

On 2/6/24 10:54, Andrea della Porta wrote:
> Introducing the field 'el0' to the idreg-override for register
> ID_AA64PFR0_EL1. This field is also aliased to the new kernel
> command line option 'arm64.no32bit_el0' as a more recognizable
> and mnemonic name to disable the execution of 32 bit userspace
> applications (i.e. avoid Aarch32 execution state in EL0) from
> kernel command line.
> 
> Link: https://lore.kernel.org/r/ZVTleETzfFUchs77@apocalypse
> Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 3 +++
>  arch/arm64/kernel/idreg-override.c              | 2 ++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 65731b060e3f..9f962deeef5a 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -433,6 +433,9 @@
>  	arm64.nosve	[ARM64] Unconditionally disable Scalable Vector
>  			Extension support
>  
> +	arm64.no32bit_el0 [ARM64] Unconditionally disable the execution of
> +			32 bit applications
> +

That new entry is not in alphabetical order like it should be.

>  	ataflop=	[HW,M68k]
>  
>  	atarimouse=	[HW,MOUSE] Atari Mouse


-- 
#Randy