linux-kernel - Re: [PATCH 4/4] x86/pti: Do not enable PTI on fixed Intel processors

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Date:   Sat, 20 Jan 2018 21:13:05 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     David Woodhouse <dwmw@...zon.co.uk>
cc:     arjan@...ux.intel.com, karahmed@...zon.de, x86@...nel.org,
        linux-kernel@...r.kernel.org, tim.c.chen@...ux.intel.com,
        bp@...en8.de, peterz@...radead.org, pbonzini@...hat.com,
        ak@...ux.intel.com, torvalds@...ux-foundation.org,
        gregkh@...ux-foundation.org
Subject: Re: [PATCH 4/4] x86/pti: Do not enable PTI on fixed Intel
 processors



On Sat, 20 Jan 2018, Thomas Gleixner wrote:

> On Sat, 20 Jan 2018, David Woodhouse wrote:
> 
> > When they advertise the IA32_ARCH_CAPABILITIES MSR and it has the RDCL_NO
> > bit set, they don't need KPTI either.
> 
> Do they exist today? And do we have documentation for that new MSR already?

Scratch the seconds question. It's in that spec mitigations PDF.

The first question stands.

Thanks,

	tglx