Re: [Xen-devel] [RFC + Queries] Flow of PCI passthrough in ARM

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-10-02 at 17:59 +0100, Stefano Stabellini wrote:
> On Thu, 2 Oct 2014, Stefano Stabellini wrote:
> > > >> >> using this the ITS emulation code in xen is able to trap ITS command
> > > >> >> writes by driver.
> > > >> >> But we are facing a problem now, where your help is needed
> 
> Actually  given that you are talking about the virtual ITS, why do you
> need the real Device ID or Stream ID of the passthrough device in the
> guest at all?  Shouldn't you just be generating a bunch of virtual IDs
> instead?
> 
> Let's take a step back: why do you need *real* IDs to program a
> *virtual* ITS?

Ack, I'm having a great deal of trouble figuring out why the guest would
ever see a physical hardware identifier of any kind.

Ian.


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