Re: [RFC PATCH 0/11] Support Write-Through mapping on x86

[H. Peter Anvin]

On 07/21/2014 09:31 AM, Toshi Kani wrote:
> Do you have any comments / suggestions for this approach?

Approach to what, specifically?

Keep in mind the PAT bit is different for large pages.  This needs to be
dealt with.  I would also like a systematic way to deal with the fact
that Xen (sigh) is stuck with a separate mapping system.

I guess Linux could adopt the Xen mappings if that makes it easier, as
long as that doesn't have a negative impact on native hardware -- we can
possibly deal with some older chips not being optimal.  However, my
thinking has been to have a "reverse PAT" table in memory of memory
types to encodings, both for regular and large pages.

	-hpa



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