Re: [RFC 0/4] Virtio uses DMA API for all devices

[Christoph Hellwig]

On Fri, Aug 03, 2018 at 10:17:32PM +0300, Michael S. Tsirkin wrote:
> It seems reasonable to teach a platform to override dma-range
> for a specific device e.g. in case it knows about bugs in ACPI.

A platform will be able override dma-range using the dev->bus_dma_mask
field starting in 4.19.  But we'll still need a way how to

  a) document in the virtio spec that all bus dma quirks are to be
     applied
  b) a way to document in a virtio-related spec how the bus handles
     dma for Ben's totally fucked up hypervisor.  Without that there
     is not way we'll get interoperable implementations.