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    SubjectRe: [RFC 0/4] Virtio uses DMA API for all devices
    On Fri, Aug 03, 2018 at 10:58:36AM -0500, Benjamin Herrenschmidt wrote:
    > On Fri, 2018-08-03 at 00:05 -0700, Christoph Hellwig wrote:
    > > > 2- Make virtio use the DMA API with our custom platform-provided
    > > > swiotlb callbacks when needed, that is when not using IOMMU *and*
    > > > running on a secure VM in our case.
    > >
    > > And total NAK the customer platform-provided part of this. We need
    > > a flag passed in from the hypervisor that the device needs all bus
    > > specific dma api treatment, and then just use the normal plaform
    > > dma mapping setup.
    >
    > Christoph, as I have explained already, we do NOT have a way to provide
    > such a flag as neither the hypervisor nor qemu knows anything about
    > this when the VM is created.

    Well, if your setup is so fucked up I see no way to support it in Linux.

    Let's end the discussion right now then.

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