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RE: [Xen-devel] Multiple I/O domains?

To: "Rob Gardner" <rob.gardner@xxxxxx>
Subject: RE: [Xen-devel] Multiple I/O domains?
From: "Neugebauer, Rolf" <rolf.neugebauer@xxxxxxxxx>
Date: Wed, 31 Aug 2005 23:13:35 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
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Thread-topic: [Xen-devel] Multiple I/O domains?
Multiple IO domains are currently not supported in 3.x. this is mainly
due to the moving of the PCI into dom0 (out of Xen). There was a
discussion on this a month back on the mailing list on how to re-enable
this, but I don't know if anyone is actively working on this at the

If you want multiple io domains you'd have to use 2.x for now. There is
a xen command option allowing you to hide pci devices from dom0 and then
the config file for a VM has an option to assign a PCI device to another
VM. AFAIK there is no cookbook for this


> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Rob Gardner
> Sent: 31 August 2005 22:54
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] Multiple I/O domains?
> I'd like to set up a xen system with mutliple I/O domains.
> A few questions:
> Is this known to work?
> Should I use xen 2.0x or xen 3.x to start with. Which has better
> for multiple I/O domains?
> Is there a cookbook someplace for doing this? A quick search didn't
> reveal anything. A few people have already given us some hints, but
> information is a little too sparse.
> Finally, are there some requirements that aren't obvious? For
> I've got a machine with with one disk and one nic. Is that sufficient,
> or do I need additional interfaces? I'd like to be able to have just
> domains, one controlling the nic, the other disk. Is this possible? It
> seems like dom0 must be the driver domain for its own boot device.
> Rob Gardner
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