[Xen-devel] Re: [RFC] [PATCH] xen, vtd: Check ownership of a domain context using internal structures

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 27.07.11 at 12:52, George Dunlap <George.Dunlap@xxxxxxxxxxxxx> wrote:
> And in a related note...
> 
> What is the implication of the "Devices on a bus behind a bridge look
> like they're coming from X:0.0" for passing virtual functions through
> to different VMs?  Will it simply not work (since the mapping of X:0.0
> can't be owned by both)?  Is there a way it can be made to work
> without allowing the virtual function of one domain access to the
> memory of the other domain?

No, that can't afaik - these devices are required to be PCIe, and the
issue here only applies to traditional PCI bridges (and I don't think PCIe
devices can sit behind one, or if they can, the code isn't prepared to
deal with that anyway).

Jan


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