[Intel-gfx] [IGDVFIO] [PATCH 3/8] RFC and help completing: Intel IGD Direct Assignment with VFIO

[Paolo Bonzini]

Il 24/09/2014 21:47, Alex Williamson ha scritto:
> So the opregion is mapped by a config write on the IGD device itself and
> the other 3 regions, that we know about so far, are mapped via writes to
> the host bridge.

AFAIU the opregion is mapped by the (host) BIOS, that writes the address
to a well-known scratch dword in the configuration space.  The host
reads from the dword and finds the opregion that way.

Paolo