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

From: H. Peter Anvin
Date: Wed Jul 28 2010 - 18:53:45 EST

On 07/28/2010 03:38 PM, Konrad Rzeszutek Wilk wrote:
> Long term I think the driverization is the way to go, and..
> I think the flow a). check if we need SWIOTLB b), check all IOMMUs, c).
> recheck SWIOTLB in case no IOMMUs volunteered MUST be preserved
> irregardless if we driverize the IOMMUs/SWIOTLB or not.
> Perhaps we should get together at one of these Linux conferences and
> think this one through? Beers on me.

I don't understand point (a) here. (c) simply seems like the fallback
case, and in the case we are actively forcing swiotlb we simply skip
step (b).

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