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    SubjectRe: [Xen-devel] Re: [RFC] Make AGP work with IOMMU
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    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
    David.Woodhouse@intel.com Intel Corporation



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