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Re: [Xen-users] VT-x not found..

To: Bart Coninckx <bart.coninckx@xxxxxxxxxx>, Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] VT-x not found..
From: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Date: Tue, 01 Jun 2010 00:45:46 +0100
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this email in error.


On 01/06/10 00:43, Jonathan Tripathy wrote:

On 31/05/10 21:22, Jonathan Tripathy wrote:

On 31/05/10 21:23, Bart Coninckx wrote:
On Monday 31 May 2010 21:59:24 Jonathan Tripathy wrote:
Jonathan Tripathy
I.T. Solutions Manager
ABPNI Computer Solutions Ltd.
Registered Address:
Emerson House, Belfast, BT8 8DN
Tel: +44 (0)800 11 234 28
Web: www.abpni.com
Registered in N. Ireland No. 602753

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On 31/05/10 20:45, Bart Coninckx wrote:
On Monday 31 May 2010 21:42:20 Jonathan Tripathy wrote:
On 31/05/10 20:42, Bart Coninckx wrote:
On Monday 31 May 2010 20:24:15 Jonathan Tripathy wrote:
On 31/05/10 19:11, Rudi Ahlers wrote:
On Mon, May 31, 2010 at 8:00 PM, Jonathan Tripathy<jonnyt@xxxxxxxxxxx
<mailto:jonnyt@xxxxxxxxxxx>>    wrote:

       Hi Everyone,

       I upgraded my CentOS 5.5 to Xen 3.4.2 using this guide:

http://www.syntaxtechnology.com/2010/01/upgrade-xen-3-0-on-centos-5-4
-x 86 _64-to-xen-3-4-2/

Now, using the new kernel that it gave me, the system doesn't
seem to be able to detect vt-x..

       In virt-manager, Local Install Media and Network Boot are
greyed out..

       Any ideas?

       Thanks

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Doe your CPU acrtually support vt-x?


Website: http://www.SoftDux.com
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Yes it does. It worked fine with the orignal version of Xen that came with CentOS 5.5. It's a brand new server opened today from Dell which
support Vt-x and Vt-d. Virtualisation technology is enabled in the
BIOS
You have the vmx flag in /proc/cpuinfo?
I suppose you had the VT extension enabled before the migration but
suppose you fiddled with it, power down your host (like shutdown and
pull the plug) and power it up again. I experienced this being
necessary once because simple rebooting after getting out of the BIOS
did NOT enable VT for real.

B.
Nope, I don't have that flag in cpuinfo, but I can't understand why....
Is it possible that the kernel upgrade can disable this somehow??

It's really confusing me
I personally think not. Do the power recycle thing and check again. If you're sure it's on in the BIOS. Ow yes, which reminds me, I once had a BIOS where it needed to be enabled on two different spots - I think it
was a HP machine.
Power cycling made no different. I had the plug out for about 2 or 3
minutes.

This is really starting to worry me why the vmx flag isn't showing...

I never checked for the vmx flag in the vanilla install, but since I was
able to create an HVM guest, I image it would have been there?

I can't imagine this is a result of the kernel being used. Whatever is in /proc/cpuinfo is what Linux reads out of the BIOS. Something is wrong there.

Hmm I just threw in a Ubuntu live CD there and vmx is showing....
Something must be dud in that Xen 3.4.2 source that i downloaded...

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Ok this is starting to bug me...

I installed Ubuntu 10.04 onto my server. I then spent a couple of hours compiling and installing Xen 4.0. Now yet again, vmx has disappeared from /proc/cpuinfo!!!!

Xend isn't working correctly, but that's another issue, so I can't really test any HVM guests.

Buggy BIOS??

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Actually, maybe this is correct with newer version of Xen:
http://www.linux-kvm.org/page/FAQ#How_can_I_tell_if_I_have_Intel_VT_or_AMD-V.3F

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