Re: [Xen-devel] [PATCH v5 02/11] vpci: introduce basic handlers to trap accesses to the PCI config space

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Tue, Sep 12, 2017 at 11:42:38AM +0100, Julien Grall wrote:
> Hi Roger,
> 
> On 14/08/17 15:28, Roger Pau Monne wrote:
> > This functionality is going to reside in vpci.c (and the corresponding
> > vpci.h header), and should be arch-agnostic. The handlers introduced
> > in this patch setup the basic functionality required in order to trap
> > accesses to the PCI config space, and allow decoding the address and
> > finding the corresponding handler that should handle the access
> > (although no handlers are implemented).
> 
> If I understand correctly this patch, the virtual BDF will always correspond
> to the physical BDF. Is that right? If so, would you mind to explain why
> such restriction?

Yes, this is not a limitation of this patch, but of the implementation
that follows. Likely this will be expanded when support for DomU is
added, but for Dom0 at least on x86 adding such a translation layer is
not needed, since I see no reason to present a different PCI topology
to Dom0.

Thanks, Roger.

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