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RE: [Xen-users] AMD-V or VT

To: "'Brian P. Martin'" <Brian@xxxxxxxxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] AMD-V or VT
From: "Dustin Henning" <Dustin.Henning@xxxxxxxxxxx>
Date: Fri, 7 Aug 2009 13:37:00 -0400
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        If you search the archives, you will find that it is a bit
complicated.  I don't know if I'm getting the details right, but I think
basically you can pass PCI through to HVM guests without VT-D, but you need
VT-D to pass through to PV guests.  If this is accurate, it may also apply
to AMD-V without IOMMU.  I could be all out of whack, though, and it may be
that VT-D doesn't even work for PV without hacking, I don't remember the
details, and I haven't done it.

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Brian P. Martin
Sent: Friday, August 07, 2009 13:32
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] AMD-V or VT

> VT currently because you get PCI Pass-through support. New DDR3
> Opterons
> will offer PCI Passthrough later this year but I assume you are buying
> now.

Does that mean that current and older Opterons *can't* pass a PCI device
through to a guest, or that they don't do it as efficiently as on the Intel
VT machines?  I've been pulling my hair out trying to get a fully
virtualized guest access to a PCI card on an Opteron 1220.

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