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Date: Tue, 12 Dec 2017 14:28:56 +0000
From: Will Deacon <will.deacon@arm.com>
To: Borislav Petkov <bp@alien8.de>
Cc: X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andy Lutomirsky <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Greg KH <gregkh@linuxfoundation.org>, keescook@google.com,
        hughd@google.com, Brian Gerst <brgerst@gmail.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Denys Vlasenko <dvlasenk@redhat.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>,
        David Laight <David.Laight@aculab.com>,
        Eduardo Valentin <eduval@amazon.com>, aliguori@amazon.com,
        daniel.gruss@iaik.tugraz.at, tglx@linutronix.de
Subject: Re: [PATCH] x86/pti: Add pti= cmdline option and documentation
Message-ID: <20171212142856.GA15783@arm.com>
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Hi Borislav, [+ tglx]

On Tue, Dec 12, 2017 at 02:39:52PM +0100, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
> 
> Keep the "nopti" for traditional reasons.
> 
> Requested-by: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Borislav Petkov <bp@suse.de>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Andy Lutomirsky <luto@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Dave Hansen <dave.hansen@intel.com>
> Cc: Greg KH <gregkh@linuxfoundation.org>
> Cc: keescook@google.com
> Cc: hughd@google.com
> Cc: Brian Gerst <brgerst@gmail.com>
> Cc: Josh Poimboeuf <jpoimboe@redhat.com>
> Cc: Denys Vlasenko <dvlasenk@redhat.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Cc: Juergen Gross <jgross@suse.com>
> Cc: David Laight <David.Laight@aculab.com>
> Cc: Eduardo Valentin <eduval@amazon.com>
> Cc: aliguori@amazon.com
> Cc: Will Deacon <will.deacon@arm.com>
> Cc: daniel.gruss@iaik.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