From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: [nVMX with: v3.9-11789-ge0fd9af] Stack trace when L2 guest is rebooted. Date: Sun, 12 May 2013 11:32:10 +0300 Message-ID: <20130512083210.GD10830@redhat.com> References: <518D0E54.7000004@siemens.com> <518D111A.2070604@siemens.com> <518D216C.90107@siemens.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jan Kiszka , Kashyap Chamarthy , "kvm@vger.kernel.org" To: "Nakajima, Jun" Return-path: Received: from mx1.redhat.com ([209.132.183.28]:49771 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751924Ab3ELIcR (ORCPT ); Sun, 12 May 2013 04:32:17 -0400 Content-Disposition: inline In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On Fri, May 10, 2013 at 10:40:22AM -0700, Nakajima, Jun wrote: > On Fri, May 10, 2013 at 9:33 AM, Jan Kiszka wrote: > > On 2013-05-10 17:39, Kashyap Chamarthy wrote: > >> On Fri, May 10, 2013 at 8:54 PM, Jan Kiszka wrote: > >>> > >>> On 2013-05-10 17:12, Jan Kiszka wrote: > >>>> On 2013-05-10 15:00, Kashyap Chamarthy wrote: > >>>>> Heya, > >>>>> > >>>>> This is on Intel Haswell. > >>>>> > >>>>> First, some version info: > >>>>> > >>>>> L0, L1 -- both of them have same versions of kernel, qemu: > >>>>> > > I tried to reproduce such a problem, and I found L2 (Linux) hangs in > SeaBIOS, after line "iPXE (http://ipxe.org) ...". It happens with or > w/o VMCS shadowing (and even without my virtual EPT patches). I didn't > realize this problem until I updated the L1 kernel to the latest (e.g. > 3.9.0) from 3.7.0. L0 uses the kvm.git, next branch. It's possible > that the L1 kernel exposed a bug with the nested virtualization, as we > saw such cases before. > This is probably fixed by 8d76c49e9ffeee839bc0b7a3278a23f99101263e. Try it please. -- Gleb.