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RE: [Xen-users] PCI Passthrough

To: "'Nick Couchman'" <Nick.Couchman@xxxxxxxxx>, "'XEN Mailing List'" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] PCI Passthrough
From: "Dustin Henning" <Dustin.Henning@xxxxxxxxxxx>
Date: Wed, 30 Sep 2009 11:07:47 -0400
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        You're likely to get the "sorry, you're out of luck" response, but
IIRC, PCI Passthrough can be used with one type of domU without VT-d/iommu.
This may require custom compilation or something, though, as it poses a
security risk.  The answer should be hidden deep within the archives of this
mailing list.

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Nick Couchman
Sent: Wednesday, September 30, 2009 11:01
To: XEN Mailing List
Subject: [Xen-users] PCI Passthrough

A question that I think I probably know the answer to, but I want to verify.
 Do PCI Passthrough to HVM domUs require VTd or IOMMU?  From what I've read
in various places around the Internet, the answer is yes, but it's never
been explicitly stated.  I have a multi-port PCI serial card on a
non-VTd-capable machine that I want to passthrough to a Windows domU.  PCI
passthrough would be the easiest option, except for the lack of VTd.  I
tried doing something with the IRQ and IOPORTS to pass it through, but I
ended up with a device type "Xen Ioports" in my Windows domU and couldn't
really get the correct driver installed.  Any hints would be appreciated -
even if it's to say, "Sorry, you're out of luck - go buy a machine with

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