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

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Message-ID: <4C5185D0.9060507@zytor.com>
Date:	Thu, 29 Jul 2010 06:44:48 -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, jbarnes@...tuousgeek.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	tglx@...utronix.de
Subject: Re: [PATCH 9/9] x86: Detect whether we should use Xen SWIOTLB.

On 07/29/2010 12:17 AM, FUJITA Tomonori wrote:
> btw, (c) is not the fallback case (i.e. if we can't find hardware
> IOMMU, we enable swiotlb). We use both hardware IOMMU and swiotlb on
> some systems.

Right, which is why it can't be folded into (b).

	-hpa

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

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