VFIO implements platform independent stuff such as
a PCI driver, BAR access (via read/write on a file descriptor
or direct mapping when possible) and IRQ signaling.
The platform dependent part includes IOMMU initialization
and handling. This implements an IOMMU driver for VFIO
which does mapping/unmapping pages for the guest IO and
provides information about DMA window (required by a POWER
guest).
Cc: David Gibson
Signed-off-by: Alexey Kardashevskiy
Signed-off-by: Paul Mackerras
Acked-by: Alex Williamson
Signed-off-by: Benjamin Herrenschmidt