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    SubjectRe: [kvm-devel] [PATCH 3/8] KVM: PVDMA Guest: Guest-side routines for paravirtualized DMA
    On Wed, Nov 07, 2007 at 04:21:04PM +0200, Amit Shah wrote:

    > We make the dma_mapping_ops structure to point to our structure so
    > that every DMA access goes through us. (This is the reason this only
    > works for 64-bit guest. 32-bit guest doesn't yet have a dma_ops
    > struct.)

    I need the same facility for Calgary for falling back to swiotlb if a
    translation is disabled on some slot, and IB needs the same facility
    for some IB adapters (e.g., ipath). Perhaps it's time to consider
    stackable dma-ops (unless someone has a better idea...).

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