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    SubjectRe: [PATCH 9/9] x86: Detect whether we should use Xen SWIOTLB.
    On Tue, Aug 03, 2010 at 01:01:08AM +0900, FUJITA Tomonori wrote:
    > On Mon, 02 Aug 2010 08:47:53 -0700
    > "H. Peter Anvin" <hpa@zytor.com> wrote:
    >
    > > On 08/02/2010 08:43 AM, FUJITA Tomonori wrote:
    > > >
    > > > That's the difficult part because IOMMUs are not
    > > > interdependent. Hardware IOMMUs are related with swiotlb. GART and
    > > > AMD-IOMMU are too.
    > > >
    > > > We could invent sorta IOMMU register interface and driver-ize IOMMUs
    > > > but they can't be interdependent completely.
    > >
    > > Of course. However, we need there to be as much structure to it as
    > > there can be.
    >
    > Ok, let's see if Konrad can invent something clean.

    <chuckles> Thank you for your vote of confidence.
    >
    > But his attempt to create "swiotlb iommu function array" and "hardware
    > iommu function array" looks like to makes the code more unreadable.

    Let me go to my favorite coffee shop and think this one through.
    Can I get concession for putting the original patch in (the simple, dumb one),
    and then:
    - start working on the IOMMU register interface without having to try
    to get it done for 2.6.36, and
    - do the driverization as a seperate cleanup.



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