[Xen-devel] HVM Driver Domain for GPU API remoting

["Michael A. Collins" <mike.a.collins@xxxxxxxxxxx>]

I recently read about Xen3D and the whole idea of API remoting for 
graphics is new to me, so that's the level I'm coming from.  My question 
is as follows:
I understand that graphics passthrough only works for HVM DomUs, with 
that being said most of the driver domains I read about for networking 
are paravirtualized with a passed through NIC.  Is there any work being 
done to introduce the concept of a HVM-based Driver Domain, so that one 
can pass a GPU through?  If so, would it not be faster to remote the API 
through to the Driver Domain hosting the GPU with a Xenbus form of 
communication?  My concern, other than the fact that I don't understand 
a thing about how Xenbus and other drivers work, is that there wouldn't 
be the throughput needed to provide any better support than is currently 
handled by the virtual framebuffer.  I know that that kind of 
communication handles all block-level and network traffic, but the 
amount of data required to drive a GPU would be much more.  Am I barking 
up the wrong tree, or is this a project that would benefit the 
community?
Mike

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