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    SubjectRe: [00/15] swiotlb cleanup
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    On Mon, 2009-07-13 at 18:53 +0900, FUJITA Tomonori wrote:
    > On Mon, 13 Jul 2009 10:40:29 +0100
    > Ian Campbell <Ian.Campbell@eu.citrix.com> wrote:
    >
    > > On Mon, 2009-07-13 at 05:20 +0100, FUJITA Tomonori wrote:
    > > > On Fri, 10 Jul 2009 15:02:00 +0100
    > > > Ian Campbell <Ian.Campbell@citrix.com> wrote:
    > > >
    > > > > On Fri, 2009-07-10 at 14:35 +0900, FUJITA Tomonori wrote:
    > > > > > I don't think that we need to take account of dom0 support; we don't
    > > > > > have a clear idea about an acceptable dom0 design (it needs to use
    > > > > > swiotlb code? I don't know yet), we don't even know we will have dom0
    > > > > > support in mainline. That's why I didn't CC this patchset to Xen
    > > > > > camp.
    > > > >
    > > > > The core domain 0 patches which were the subject of the discussions a
    > > > > few week back are completely orthogonal to the swiotlb side of things
    > > >
    > > > ? If we don't merge dom0 patch, we don't need dom0 changes to
    > > > swiotlb. We don't know we would have dom0 support in mainline. Or I
    > > > overlooked something?
    > > [...]
    > > > As far as I know, you have not posted anything about changes to
    > > > swiotlb for domU. I can't discuss it. If you want, please send
    > > > patches.
    > >
    > > There are no separate domU swiotlb patches -- the exact the same patches
    > > as we have already been discussing are useful and necessary for both
    > > domU and dom0.
    >
    > Hmm, you guys introduced the swiotlb hooks by saying that it's for
    > only dom0.

    That was just sloppy wording on our part. domain 0 is the major usecase
    today so there is a tendency to think in those terms but the changes are
    actually relevant to any domain with access to a physical device that
    can do DMA, this includes domU via PCI passthrough.

    > I don't see any comments like 'this is useful to dom0 too'. I'm still
    ^U?
    > not sure what exactly part is useful to domU.

    All of it...

    Ian.



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