linux-kernel - Re: [PATCH v2 5/5] x86/pti: Do not enable PTI on fixed Intel processors

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Message-ID: <1516733089.9521.162.camel@amazon.co.uk>
Date:   Tue, 23 Jan 2018 18:44:49 +0000
From:   "Woodhouse, David" <dwmw@...zon.co.uk>
To:     Dave Hansen <dave.hansen@...el.com>, <arjan@...ux.intel.com>,
        <tglx@...utronix.de>, <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>, <thomas.lendacky@....com>
Subject: Re: [PATCH v2 5/5] x86/pti: Do not enable PTI on fixed Intel
 processors

On Tue, 2018-01-23 at 10:41 -0800, Dave Hansen wrote:
> On 01/23/2018 08:52 AM, 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.
> 
> Also, I hate to ask...  Have you tested this patch?

Nope. I deliberately haven't implemented IBRS_ALL because I have no
suitable hardware for that and there are some non-trivial parts, but
this one really *should* be trivial so seemed OK to do without
hardware.
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