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

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Date:	Tue, 29 Oct 2013 10:45:59 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jan Beulich <JBeulich@...e.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 Tue, Oct 29, 2013 at 08:23:30AM +0000, Jan Beulich wrote:
> >>> 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?

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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