linux-kernel - Re: [PATCH] arm64: Make kpti command line options x86 compatible

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Message-ID: <20181115094116.GA18154@infradead.org>
Date:   Thu, 15 Nov 2018 01:41:16 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Alexander Graf <agraf@...e.de>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Richard Brown <rbrown@...e.de>,
        Matthias Brugger <mbrugger@...e.com>
Subject: Re: [PATCH] arm64: Make kpti command line options x86 compatible

On Tue, Nov 13, 2018 at 04:20:46PM +0100, Alexander Graf wrote:
> I've already stumbled over 2 cases where people got confused about how to
> disable kpti on AArch64. In both cases, they used existing x86_64 options
> and just applied that to an AArch64 system, expecting it to work.
> 
> I think it makes a lot of sense to have compatible kernel command line
> parameters whenever we can have them be compatible.
> 
> So this patch adds the pti= and no_pti kernel command line options, mapping
> them into the existing kpti= command line framework. It preserves the old
> syntax to maintain compatibility with older command lines.
> 
> While at it, the patch also marks the respective options as dual-arch.

Thanks.  Which also brings up my old complainﬆ that arm64 and x86 should
use the same config option.  Bonus points for moving the parsing code
to a common file..