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

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Message-ID: <20090520225235.GJ8684@one.firstfloor.org>
Date:	Thu, 21 May 2009 00:52:35 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	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>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [GIT PULL] xen /proc/mtrr implementation

> >Is this new interface only defined for swiotlb or MMIO mappings?
> >If yes did you check the drivers only actually set it on
> >swiotlb or MMIO (that seems dubious to me)?
> 
> Really?   Do we ever set unusual memory types on normal system memory?  

There were drivers at some point that set WC MTRRs on their
transfer rings, not mmio.

Maybe these all switched to PAT now, maybe not

It's hard to say because it could be also done from user space.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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