From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: CPU change causes hanging of .NET apps Date: Tue, 03 Nov 2009 17:56:37 +0200 Message-ID: <4AF052B5.6090506@redhat.com> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Erik Rull , "kvm@vger.kernel.org" To: Timur Safin Return-path: Received: from mx1.redhat.com ([209.132.183.28]:20178 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752223AbZKCP4i (ORCPT ); Tue, 3 Nov 2009 10:56:38 -0500 In-Reply-To: <68e9e5f50911030711i98e15d9t975bc252b9fdf634@mail.gmail.com> Sender: kvm-owner@vger.kernel.org List-ID: 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 -- error compiling committee.c: too many arguments to function