linux-kernel - Re: [PATCH] x86/pti: Add pti= cmdline option and documentation

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Date:   Tue, 12 Dec 2017 14:28:56 +0000
From:   Will Deacon <will.deacon@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirsky <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Greg KH <gregkh@...uxfoundation.org>, keescook@...gle.com,
        hughd@...gle.com, Brian Gerst <brgerst@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        David Laight <David.Laight@...lab.com>,
        Eduardo Valentin <eduval@...zon.com>, aliguori@...zon.com,
        daniel.gruss@...k.tugraz.at, tglx@...utronix.de
Subject: Re: [PATCH] x86/pti: Add pti= cmdline option and documentation

Hi Borislav, [+ tglx]

On Tue, Dec 12, 2017 at 02:39:52PM +0100, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> Keep the "nopti" for traditional reasons.
> 
> Requested-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Andy Lutomirsky <luto@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Dave Hansen <dave.hansen@...el.com>
> Cc: Greg KH <gregkh@...uxfoundation.org>
> Cc: keescook@...gle.com
> Cc: hughd@...gle.com
> Cc: Brian Gerst <brgerst@...il.com>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Cc: Denys Vlasenko <dvlasenk@...hat.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: David Laight <David.Laight@...lab.com>
> Cc: Eduardo Valentin <eduval@...zon.com>
> Cc: aliguori@...zon.com
> Cc: Will Deacon <will.deacon@....com>
> Cc: daniel.gruss@...k.tugraz.at
> ---
>  Documentation/admin-guide/kernel-parameters.txt |  6 ++++++
>  arch/x86/mm/pti.c                               | 18 ++++++++++++++++++
>  2 files changed, 24 insertions(+)

On arm64, I've gone for kpti=. I'm happy to change this to align with x86,
but the patches are queued now so I don't want to keep changing it.

Is "pti=" definitely what you're going for on x86?

Will