From mboxrd@z Thu Jan 1 00:00:00 1970 From: Erik Rull Subject: Re: CPU change causes hanging of .NET apps Date: Thu, 05 Nov 2009 20:03:06 +0100 Message-ID: <4AF3216A.1090608@rdsoftware.de> References: <4AE8B401.3030408@rdsoftware.de> <4AEDAC78.8090307@redhat.com> <4AEE1D80.1090008@rdsoftware.de> <4AEE77CD.9050300@redhat.com> <4AF044AF.5020409@rdsoftware.de> <4AF04508.3080209@redhat.com> <68e9e5f50911030711i98e15d9t975bc252b9fdf634@mail.gmail.com> <4AF052B5.6090506@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: "kvm@vger.kernel.org" To: Avi Kivity Return-path: Received: from moutng.kundenserver.de ([212.227.126.186]:52507 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757813AbZKETDI (ORCPT ); Thu, 5 Nov 2009 14:03:08 -0500 In-Reply-To: <4AF052B5.6090506@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Avi Kivity wrote: > On 11/03/2009 05:11 PM, Timur Safin wrote: >> >> My totally noob in QEMU guess - >> my bet it's CR4.OSFXSR which is controlled by presence of >> cpuid.1.edx[24] - FXSR bit (FXSAVE and FXRSTOR) instructions. >> > > That would affect floating point as well. > >> I'm curious - is there any way in QEMU to redefine returned cpuid leaf >> values? It will be interesting to see results if that given bit will >> be disabled in configuration. >> > > qemu -cpu host,-flag > I tried that value, result is an error: Unable to find x86 CPU definition - Erik