WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] [PATCH 0/3][RFC] PV Passthrough PCI Device Hotplug Suppo

To: Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 0/3][RFC] PV Passthrough PCI Device Hotplug Support
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Thu, 21 Feb 2008 12:50:08 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Thu, 21 Feb 2008 04:50:49 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <47BD70A1.6000103@xxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: Ach0iEmliF+lHOB7EdyH3gAX8io7RQ==
Thread-topic: [Xen-devel] [PATCH 0/3][RFC] PV Passthrough PCI Device Hotplug Support
User-agent: Microsoft-Entourage/11.3.6.070618
On 21/2/08 12:37, "Yosuke Iwamatsu" <y-iwamatsu@xxxxxxxxxxxxx> wrote:

> If you are unwilling to change the main state node,
> watching individual device nodes may be a possible solution.
> In that case, we prepare pci slots for hotplug and make pciback/pcifront
> watch all the states of these slots. But I wonder if it is acceptable
> that pv drivers watch lots of xenstore nodes.
> 
> I'm not sure about the idea to have a separate configuration node
> per device. Does that mean having pv drivers for each pci device?

I mean have an extra global node called e.g., reconfigure. Set to 1 when
pciback has updated hotplug info, causes pcifront to set reconfigure back to
0 and then re-scan the xenstore directory. Would that work?

> dev-# names are the physical names.
> vdev-# becomes the same as dev-# when compiled with PCIDEV_BACKEND_PASS,
> but different when compiled with other options (VPCI, SLOT).
> vdev-# names are necessary for pcifront to recognize which devices are
> to be detached.

Why would pcifront need to know the physical name? I would think that dev-#
should be the virtual name.

 -- Keir



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel