Re: [PATCH 4.9 43/92] x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown

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Subject: Re: [PATCH 4.9 43/92] x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Date: Tue, 13 Feb 2018 07:56:03 -0800
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Nick Lowe <nick.lowe@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, stable@xxxxxxxxxxxxxxx, David Woodhouse <dwmw@xxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, gnomes@xxxxxxxxxxxxxxxxxxx, ashok.raj@xxxxxxxxx, karahmed@xxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, Borislav Petkov <bp@xxxxxxxxx>, pbonzini@xxxxxxxxxx, tim.c.chen@xxxxxxxxxxxxxxx
In-reply-to: <b0680083-5cd2-e152-0d64-f5a931274a8e@linux.intel.com>
User-agent: Mutt/1.9.1 (2017-09-22)

On Tue, Feb 13, 2018 at 07:09:44AM -0800, Arjan van de Ven wrote:
> > 
> > So, any hints on what you think should be the correct fix here?
> 
> the patch sure looks correct to me, it now has a nice table for CPU IDs
> including all of AMD (and soon hopefully the existing Intel ones that are not exposed to meltdown)

I don't think the table is nice, it's a white list that would need
to be maintained forever.

-Andi

Follow-Ups:
- Re: [PATCH 4.9 43/92] x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
  - From: Dave Hansen
- Re: [PATCH 4.9 43/92] x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
  - From: Thomas Gleixner

References:
- [PATCH 4.9 00/92] 4.9.81-stable review
  - From: Greg Kroah-Hartman
- [PATCH 4.9 43/92] x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
  - From: Greg Kroah-Hartman
- Re: [PATCH 4.9 43/92] x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
  - From: Nick Lowe
- Re: [PATCH 4.9 43/92] x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
  - From: Greg Kroah-Hartman
- Re: [PATCH 4.9 43/92] x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
  - From: Arjan van de Ven

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