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Date: Tue, 29 Oct 2013 10:45:59 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: David Vrabel <david.vrabel@citrix.com>, Santosh.Jodh@citrix.com,
        Bjorn Helgaas <bhelgaas@google.com>, xhejtman@ics.muni.cz,
        xen-devel <xen-devel@lists.xensource.com>, boris.ostrovsky@oracle.com,
        mukesh.rathor@oracle.com, yuval.shaia@oracle.com,
        "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
Message-ID: <20131029144559.GI20487@phenom.dumpdata.com>
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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@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?

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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