Re: [PATCH 1/5] x86, mm, pat: Set WT to PA4 slot of PAT MSR

[Toshi Kani]

On Fri, 2014-09-05 at 08:07 -0700, H. Peter Anvin wrote:
> On 09/05/2014 07:00 AM, Toshi Kani wrote:
> > 
> > That's a fine idea, but as Ingo also suggested, I am going to disable
> > this feature on all Pentium 4 models.  That should give us a safety
> > margin.  Using slot 4 has a benefit that it keeps the PAT setup
> > consistent with Xen.      
> > 
> 
> Slot 4 is also the maximally problematic one, because it is the one that
> might be incorrectly invoked for the page tables themselves.

Good point.  I wonder if Xen folks feel strongly about keeping the PAT
setup consistent with the kernel.  If not, we may choose to use slot 6
(or 7).

Thanks,
-Toshi

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/