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    SubjectRe: [PATCH] swiotlb: make swiotlb allocation functions architecture-specific
    On Fri, 2009-05-22 at 07:13 -0400, FUJITA Tomonori wrote:
    > On Thu, 21 May 2009 17:15:25 +0100
    > Ian Campbell <> wrote:
    > > Some architectures need to allocate memory to be used as a swiotlb in
    > > a special manner.
    > Hmm, what architectures need a special manner? I guess only Xen.

    The x86 architecture, when running as a paravirtualised guest under Xen,
    needs it. I guess ia64 might need it for similar reasons, I'm not sure.

    How does the fact that x86-Xen is (currently) the only user invalidate
    the requirement? You seem to have a knee-jerk reaction to anything which
    might be useful to Xen and I really don't understand why that should be
    the case.

    We are talking about an initialisation path and we are not talking about
    changes which completely obscure all meaning or anything. The semantics
    of the API are pretty clear, I think.


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