This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-users] pv_ops dom0 kernel and VT cpu extensions

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] pv_ops dom0 kernel and VT cpu extensions
From: Gerry Reno <greno@xxxxxxxxxxx>
Date: Mon, 28 Dec 2009 23:01:26 -0500
Delivery-date: Mon, 28 Dec 2009 20:02:12 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <7207d96f0912281931o5a40b6ebpe9d57bd14d8da06a@xxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <4B39573B.5030109@xxxxxxxxxxx> <7207d96f0912281931o5a40b6ebpe9d57bd14d8da06a@xxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Thunderbird (X11/20070530)
Fajar A. Nugraha wrote:
On Tue, Dec 29, 2009 at 8:11 AM, Gerry Reno <greno@xxxxxxxxxxx> wrote:
My question is how can I
get pv_ops dom0 kernel or Xen 3.4.1 to pass the cpu VT flags through so that
existing KVM guests will run with cpu VT acceleration at full speed?

AFAIK you can't. The same reason why you can't get Virtualbox and KVM
to use VT together.
Only one virtualization technology can use VT at the same time.

As physical boxes gain more and more processing capability it makes no sense to restrict a physical machine to only a single hypervisor.

Libvirt will support nested VM's that pass through the VT capabilities to the next level. So it makes sense that Xen should be able to do the same thing and pass through the cpu VT capabilities to other hypervisors. Is there some law of the universe that prevents this?


Xen-users mailing list