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Re: [Xen-devel] [v1 1/2] xen/p2m: Create identity mappings for PFNs beyound E820 and PCI BARs

On Tue, Oct 29, 2013 at 08:23:30AM +0000, Jan Beulich wrote:
> >>> On 28.10.13 at 17:58, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
> >>> wrote:
> > On Fri, Oct 25, 2013 at 04:08:19PM -0600, Bjorn Helgaas wrote:
> >> If you can look at PCI host bridge apertures instead of BARs, that
> >> would solve both problems.  Reassigning those apertures is
> >> theoretically possible but is not even a gleam in our eyes yet.
> > 
> > <nods> I think I have to have both (BARs and host bridge apertures) as when
> > we do PCI passthrough to a guest - we might do it without a bridge.
> Why? Aren't the host bridge ranges necessarily a superset of the
> individual devices' BARs?

Yes. But when you pass in a PCI device to a PV guest you don't pass in the
bridge. Just the PCI device itself.

> Jan

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