On 09/05/2014 08:22 AM, Toshi Kani wrote:
> 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).
>
Who cares what the Xen folks "feel strongly about"? If strong feelings
were a design criterion Xen support would have been pulled from the
kernel a long, long time ago.
The important thing is how to design for the situation that we currently
have to live with.
-hpa
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