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    SubjectRe: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager
    On Fri, Jul 02, 2010 at 12:09:02AM -0700, Zach Pfeffer wrote:
    > Hari Kanigeri wrote:
    > >> He demonstrated the usage of his code in one of the emails he sent out
    > >> initially. Did you go over that, and what (or how many) step would you
    > >> use with the current code to do the same thing?
    > >
    > > -- So is this patch set adding layers and abstractions to help the User ?
    > >
    > > If the idea is to share some memory across multiple devices, I guess
    > > you can achieve the same by calling the map function provided by iommu
    > > module and sharing the mapped address to the 10's or 100's of devices
    > > to access the buffers. You would only need a dedicated virtual pool
    > > per IOMMU device to manage its virtual memory allocations.
    > Yeah, you can do that. My idea is to get away from explicit addressing
    > and encapsulate the "device address to physical address" link into a
    > mapping.

    The DMA-API already does this with the help of IOMMUs if they are
    present. What is the benefit of your approach over that?


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