From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Beham Subject: Nested Virtualization on KVM Date: Sun, 04 Nov 2012 15:56:09 +0100 Message-ID: <50968209.9030905@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit To: kvm@vger.kernel.org Return-path: Received: from mail-ee0-f46.google.com ([74.125.83.46]:49464 "EHLO mail-ee0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754703Ab2KDO4M (ORCPT ); Sun, 4 Nov 2012 09:56:12 -0500 Received: by mail-ee0-f46.google.com with SMTP id b15so2520196eek.19 for ; Sun, 04 Nov 2012 06:56:11 -0800 (PST) Sender: kvm-owner@vger.kernel.org List-ID: Hi, does anyone have experience with Nested Virtualization by nesting Xen 4.2 in KVM? I have KVM as Host-Hypervisor and XEN as Guest-Hypervisor and trying to install WinXP as an HVM-Guest which just worked, but the XP seems to be very slowly! It is quite confusing that executing /xl dmesg /gives me the output that SVM should be enabled (XEN) HVM : SVM enabled! But a look into /proc/cpuinfo shows, that there is no svm-flag listed in there. So may the bad performance is caused through that problem that SVM is not available and I am working with Binary Translation to handle sensitive instructions? Cheers, Mike