linux-kernel - Re: [PATCH 9/9] x86: Detect whether we should use Xen SWIOTLB.

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Message-ID: <4C56E8A9.1060004@zytor.com>
Date:	Mon, 02 Aug 2010 08:47:53 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	konrad.wilk@...cle.com, jeremy@...p.org, Ian.Campbell@...rix.com,
	albert_herranz@...oo.es, x86@...nel.org,
	linux-kernel@...r.kernel.org, jbarnes@...tuousgeek.org,
	iommu@...ts.linux-foundation.org, tglx@...utronix.de
Subject: Re: [PATCH 9/9] x86: Detect whether we should use Xen SWIOTLB.

On 08/02/2010 08:43 AM, FUJITA Tomonori wrote:
> 
> That's the difficult part because IOMMUs are not
> interdependent. Hardware IOMMUs are related with swiotlb. GART and
> AMD-IOMMU are too.
> 
> We could invent sorta IOMMU register interface and driver-ize IOMMUs
> but they can't be interdependent completely.

Of course.  However, we need there to be as much structure to it as
there can be.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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