linux-kernel - Re: [PATCH v3 5/6] x86/pti: Do not enable PTI on processors which are not vulnerable to Meltdown

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Message-ID: <20180124172645.GF16646@kroah.com>
Date:   Wed, 24 Jan 2018 18:26:45 +0100
From:   Greg KH <gregkh@...ux-foundation.org>
To:     David Woodhouse <dwmw@...zon.co.uk>
Cc:     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, dave.hansen@...el.com,
        gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH v3 5/6] x86/pti: Do not enable PTI on processors which
 are not vulnerable to Meltdown

On Wed, Jan 24, 2018 at 04:57:04PM +0000, David Woodhouse wrote:
> Some old Atoms, anything in family 5 or 4, and newer CPUs when they advertise
> the IA32_ARCH_CAPABILITIES MSR and it has the RDCL_NO bit set, are not vulnerable.
> 
> Roll the AMD exemption into the x86_match_cpu() table too.
> 
> Based on suggestions from Dave Hansen and Alan Cox.
> 
> Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>