From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41529) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X2kuA-00025v-8J for qemu-devel@nongnu.org; Thu, 03 Jul 2014 13:34:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X2ku5-0004JQ-GI for qemu-devel@nongnu.org; Thu, 03 Jul 2014 13:34:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49403) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X2ku5-0004JB-86 for qemu-devel@nongnu.org; Thu, 03 Jul 2014 13:34:37 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s63HYZti009152 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Thu, 3 Jul 2014 13:34:35 -0400 Received: from localhost (vpn1-5-29.ams2.redhat.com [10.36.5.29]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id s63HYYvS030780 for ; Thu, 3 Jul 2014 13:34:35 -0400 Date: Thu, 3 Jul 2014 18:34:33 +0100 From: "Richard W.M. Jones" Message-ID: <20140703173433.GA9554@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Subject: [Qemu-devel] Super nested KVM List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org If you have odd Intel or AMD hardware, I'd appreciate if you could test my disk image which recursively launches nested KVM until something breaks: http://rwmj.wordpress.com/2014/07/03/super-nested-kvm/#content FWIW: * AMD FX(tm)-8320 Eight-Core Processor: L3 guest fails to boot with [ 30.769000] BUG: unable to handle kernel NULL pointer dereference at 0000000000000180 [ 30.769000] IP: [] __queue_work+0x41/0x4e0 * Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz [Sandybridge]: L4 guest either hangs very early in boot, or is so slow that it makes no visible progress. There's also a TCG-only mode, but the test ran so slowly as to be inconclusive. I might leave it going overnight. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html