Message-ID: <4C56E8A9.1060004@zytor.com>
Date: Mon, 02 Aug 2010 08:47:53 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
CC: konrad.wilk@oracle.com, jeremy@goop.org, Ian.Campbell@citrix.com,
        albert_herranz@yahoo.es, x86@kernel.org, linux-kernel@vger.kernel.org,
        jbarnes@virtuousgeek.org, iommu@lists.linux-foundation.org,
        tglx@linutronix.de
Subject: Re: [PATCH 9/9] x86: Detect whether we should use Xen SWIOTLB.
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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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