linux-kernel - Re: [Xen-devel] Re: [GIT PULL] xen /proc/mtrr implementation

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Message-ID: <20090519123728.GA2377@elte.hu>
Date:	Tue, 19 May 2009 14:37:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Gerd Hoffmann <kraxel@...hat.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jan Beulich <JBeulich@...ell.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [Xen-devel] Re: [GIT PULL] xen /proc/mtrr implementation


* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > - or introduce its own hypercall API based administration API,
> >   without bothering the guest kernel with crap. Trivially patch Xorg
> >   to make use of it and that's it.
> 
> PCI pass through mixed with that isn't going to be fun and PCI 
> pass through is one area where a lot of the MTRR manipulation is 
> meaningful and valid (and can be handled for the guest).

virtualizing that aspect of the CPU properly is certainly the 
highest grade approach.

> I really don't see why rd/wrmsr processing isn't sufficient for 
> this

/me neither.

	Ingo
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