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    SubjectRe: [RFC V2] virtio: Add platform specific DMA API translation for virito devices
    On Mon, Jun 04, 2018 at 11:14:36PM +1000, Benjamin Herrenschmidt wrote:
    > On Mon, 2018-06-04 at 05:55 -0700, Christoph Hellwig wrote:
    > > On Mon, Jun 04, 2018 at 03:43:09PM +0300, Michael S. Tsirkin wrote:
    > > > Another is that given the basic functionality is in there, optimizations
    > > > can possibly wait until per-device quirks in DMA API are supported.
    > >
    > > We have had per-device dma_ops for quite a while.
    >
    > I've asked Ansuman to start with a patch that converts virtio to use
    > DMA ops always, along with an init quirk to hookup "direct" ops when
    > the IOMMU flag isn't set.
    >
    > This will at least remove that horrid duplication of code path we have
    > in there.
    >
    > Then we can just involve the arch in that init quirk so we can chose an
    > alternate set of ops when running a secure VM.
    >
    > This is completely orthogonal to whether an iommu exist qemu side or
    > not, and should be entirely solved on the Linux side.
    >
    > Cheers,
    > Ben.

    Sounds good to me.

    --
    MST

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