From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: Booting up an old Windows 3.1 harddisk image Date: Tue, 18 Oct 2011 15:13:39 +0200 Message-ID: <4E9D7B83.4020402@redhat.com> References: <20124.53132.479840.952606@quad.stoffel.home> <4E9D57FE.6050903@redhat.com> <4E9D7A17.9060107@siemens.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: John Stoffel , kvm@vger.kernel.org To: Jan Kiszka Return-path: Received: from mx1.redhat.com ([209.132.183.28]:10866 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757828Ab1JRNNw (ORCPT ); Tue, 18 Oct 2011 09:13:52 -0400 In-Reply-To: <4E9D7A17.9060107@siemens.com> Sender: kvm-owner@vger.kernel.org List-ID: On 10/18/2011 03:07 PM, Jan Kiszka wrote: > >=20 > > It's probably a bug in kvm. Try collecting a complete trace as in > > http://www.linux-kvm.org/page/Tracing and posting it here, maybe > > something will jump out. > >=20 > > Also try out -no-kvm. > > A shot from the hips: J=F6rg and I are just hunting down 16 bit task > switch issues on AMD hosts. If this problem may be related can be > checked by loading kvm-amd with npt=3D0, ie. disabling nested paging. Do you mean that you suspect that kvm's task switch emulation is more accurate than the hardware? Gleb will have a heart attack. Another area to look at is A20 emulation, based on where the hang occur= s. --=20 error compiling committee.c: too many arguments to function