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    SubjectRe: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager
    > The VCMM takes the long view. Its designed for a future in which the
    > number of IOMMUs will go up and the ways in which these IOMMUs are
    > composed will vary from system to system, and may vary at
    > runtime. Already, there are ~20 different IOMMU map implementations in
    > the kernel. Had the Linux kernel had the VCMM, many of those
    > implementations could have leveraged the mapping and topology management
    > of a VCMM, while focusing on a few key hardware specific functions (map
    > this physical address, program the page table base register).

    -- Sounds good.
    Did you think of a way to handle the cases where one of the Device
    that is using the mapped address crashed ?
    How is the physical address unbacked in this case ?


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