linux-kernel - Re: [PATCH RFC 0/3] x86: Full support of PAT

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Message-ID: <53F51A3C.1040707@zytor.com>
Date:	Wed, 20 Aug 2014 16:59:24 -0500
From:	"H. Peter Anvin" <hpa@...or.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>, jgross@...e.com
CC:	stefan.bader@...onical.com, toshi.kani@...com,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	konrad.wilk@...cle.com, ville.syrjala@...ux.intel.com,
	x86@...nel.org
Subject: Re: [PATCH RFC 0/3] x86: Full support of PAT

On 08/20/2014 07:05 AM, One Thousand Gnomes wrote:
> Doing this stuff for Xen also IMHO makes no sense at all. We shouldn't
> have a kernel full of crap to deal with Xen-isms.

We already *have* a kernel full of crap to deal with Xen-isms.  We
screwed that pooch some 10 years ago.

> IFF it means the changes can also implement a mix of four PAT entries
> on Pentium-M or earlier CPUs with PAT errata, and the full PAT on
> processors without errata then IMHO it becomes a whole world more
> interesting.

That is one of the wins, indeed, as well as handle pre-PAT processors.

	-hpa


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