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

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Message-Id: <526F7E9202000078000FD7A6@nat28.tlf.novell.com>
Date:	Tue, 29 Oct 2013 08:23:30 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	"David Vrabel" <david.vrabel@...rix.com>,
	<Santosh.Jodh@...rix.com>, "Bjorn Helgaas" <bhelgaas@...gle.com>,
	<xhejtman@....muni.cz>,
	"xen-devel" <xen-devel@...ts.xensource.com>,
	<boris.ostrovsky@...cle.com>, <mukesh.rathor@...cle.com>,
	<yuval.shaia@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [v1 1/2] xen/p2m: Create identity mappings for PFNs
 beyound E820 and PCI BARs

>>> On 28.10.13 at 17:58, Konrad Rzeszutek Wilk <konrad.wilk@...cle.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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