virtio-fs: Add DAX support for virtio-mmio

Sebastien Boeufrequested to merge
sboeuf/linux:dax_virtio_mmio into virtio-fs

Without breaking the PCI behavior, this patch relies on the new virtio spec changes proposed by David Gilbert, and allow DAX shared memory region to be used with virtio-mmio.

Signed-off-by: Sebastien Boeuf sebastien.boeuf@intel.com

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