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    SubjectRe: [PATCH 00 of 14] swiotlb/x86: lay groundwork for xen dom0 use of swiotlb
    Becky Bruce wrote:
    > 32-bit powerpc needs this support - I was actually about to push a
    > similar set of patches. We have several processors that support 36
    > bits of physical address space and do not have any iommu capability.
    > The rest of the kernel support for those processors is now in place,
    > so swiotlb is the last piece of the puzzle for that to be fully
    > functional. I need to take a closer look at this series to see
    > exactly what it's doing and how it differs from what I've been testing.
    >
    > So there is another immediate use case, and I'd really hate to see
    > this code duplicated. It should be entirely possible to remove the
    > assumption that we can save off the VA of the original buffer, which
    > is the thing that precludes HIGHMEM support, and still have nice
    > readable, maintainable code.

    Good, I'm glad I'm not just making things up ;)

    The gist of the patch is to convert all the kernel virtual addresses
    into struct page+offset. It's a fairly generic way to handle highmem
    systems, so it should work for you too. Of course, if you have a
    cleaner patch to achieve the same result, then we evaluate that too.

    J



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