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SubjectRe: [Xen-devel] Re: [RFC] Make AGP work with IOMMU
On Tue, 2009-08-04 at 16:52 -0700, Jeremy Fitzhardinge wrote:
> And just when I have patches to use them for their original purpose...
> Looking back over the thread, are you saying that most users are already
> using the DMA API correctly for AGP accesses? If that's true then we
> should be just fine.

No, not 'most users'. But perhaps we should.

All we've done so far is make intel-agp use the DMA API correctly. And
that's conditional on CONFIG_DMAR. But we could make it unconditional,
and make the other drivers do it too. The code is all fairly generic.

Without an IOMMU, the overhead would be fairly minimal.

David Woodhouse Open Source Technology Centre Intel Corporation

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