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Re: [Xen-users] I/O virtualisation disabled - ACPI issue?

  • To: xen-users@xxxxxxxxxxxxx
  • From: Alex Aune <lists@xxxxxxxxx>
  • Date: Fri, 13 Dec 2013 17:10:28 +0100
  • Delivery-date: Fri, 13 Dec 2013 16:13:24 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

On 12.12.2013 05:47, Jami Bradley wrote:
On Wed, Dec 4, 2013 at 5:00 AM,ÂJami Bradley

From:ÂJami Bradley <bradleyfamily.jami@xxxxxxxxx>
Date:ÂTue, 3 Dec 2013 18:03:36 -0700
Subject:Â[Xen-users] I/O virtualisation disabled - ACPI issue?

I just started using Xen and am trying to come up to speed. ÂI am
trying to configure a desktop PC to boot Xen, then passthrough VGA,
Keyboard, and Mouse to a VM for development. ÂI have a Win7 DomU
working beautifully without the passthrough, so I have the basics

Here is my configuration (please let me know if I missed something
ASUS P9X79 Pro motherboard, current BIOS, with VT-D enabled.
Intel I7-4930K processor

I installed CentOS 6.5 minimal for Dom0, plus a couple packages to
get things working (e.g., Perl). ÂI have xend turned off and I am
trying to do everything using the XL toolkit.

I have installed Xen 4.2.3 stable and have built and installed the
current head from GIT (post 4.3.1) with identical results.

After some debugging, I believe it is failing to parse the ACPI
table (acpi_drhd_units is empty in intel_vtd_setup) and disabling

Any tips on how to proceed?


I just wanted to follow up on my research on my issue. ÂWhat I found
is that the ASUS P9X79 Pro motherboard does *not* support VT-d. ÂIt
supports "Virtualization" by Vanderpool (aka. VT-x). ÂLooking at the
BIOS releases they have had, version 0906 added support for VT-d.
Apparently at some point they dropped/disabled it.

But, here is the last response I received from ASUS, I will cross my

I have checked with the relative department, and they mentioned a
new bios will be released to solve the VT-D option not exist in the
bios with the Ivy bridge-E cpu installed, may be in one month.
Please pay attention to our website for updating.
Sorry for the inconvenience.

Best Regards,
ASUS Product Support Team

I had a similar exprience with the Asus Rampage IV Extreme motherboard with an Ivy Bridge-E CPU, but Asus Support couldn't confirm whether or not VT-d was being worked on or not by the BIOS engineers.

Here's what they had to say:
we have had talks with R&D regarding the matter multiple times but i cant say for sure if anything will come out of them. I cant get a clear answer from them.

Luckily I was able to get my hands on a beta version through the ROG forums. A user there had acquired the same motherboard/CPU through a system manufacturer who in turn had forwarded his request for VT-d to Asus for him. In response Asus had provided the beta version I ended up getting my hands on.

In their current state I wouldn't recommend Asus boards with Ivy Bridge-E CPU's...


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