linux-kernel - Re: [PATCH -tip] x86: fix iommu=soft boot option

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Message-Id: <20091125180517P.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 25 Nov 2009 18:05:47 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	yinghai@...nel.org
Cc:	mingo@...e.hu, fujita.tomonori@....ntt.co.jp,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip] x86: fix iommu=soft boot option

On Wed, 25 Nov 2009 00:54:34 -0800
Yinghai Lu <yinghai@...nel.org> wrote:

> only remember that SLES 9 SP3 (?) at some point has problem with AMD 10h ( quad core version)
> when memory > 4 g (with USB controller ?)
> because the gart code only check K8 device id, and didn't check 10h device id. so gart iommu is not used.
> and happenly swiotlb code has problem with that kernel version.
> 
> thinking we should keep old behavior, until some day we can remove them all.

Why? We are talking about changing 2.6.33 behavior. swiotlb in 2.6.33
should be the safe option.
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