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Date: Tue, 29 Oct 2013 08:23:30 +0000
From: "Jan Beulich" <JBeulich@suse.com>
To: "Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>
Cc: "David Vrabel" <david.vrabel@citrix.com>, <Santosh.Jodh@citrix.com>,
        "Bjorn Helgaas" <bhelgaas@google.com>, <xhejtman@ics.muni.cz>,
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        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [v1 1/2] xen/p2m: Create identity mappings for PFNs
 beyound E820 and PCI BARs
References: <1382713401-4882-1-git-send-email-konrad.wilk@oracle.com>
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>>> On 28.10.13 at 17:58, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 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?

Jan

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