Re: [v1 1/2] xen/p2m: Create identity mappings for PFNsbeyound E820 and PCI BARs

From: Jan Beulich
Date: Tue Oct 29 2013 - 04:23:47 EST

>>> 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?


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