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

[Alex Aune <lists@xxxxxxxxx>]

On 12.12.2013 05:47, Jami Bradley wrote:
> On Wed, Dec 4, 2013 at 5:00 AM,ÂJami Bradley
> <bradleyfamily.jami@xxxxxxxxx>Âwrote:
>
> > From:ÂJami Bradley <bradleyfamily.jami@xxxxxxxxx>
> > To:Âxen-users@xxxxxxxxxxxxx
> > Cc:Â
> > 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
> > working.
> >
> > Here is my configuration (please let me know if I missed something
> > important):
> > 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
> > IOMMU.
> >
> > Any tips on how to proceed?
> >
> > Thanks!
> 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
> fingers!!!
>
> > 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,
> > Carter
> > 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...
Alex

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