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

[Thomas Gleixner]

On Tue, 13 Feb 2018, Andi Kleen wrote:
> 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.

No. The table is basically excluding families <=5 and a few individual
ones. Anything newer than that should tell via ARCH_CAP_RDCL_NO and not
need any entry.

Thanks,

	tglx