From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: 32-bit qemu on current x86-64 kernel segfauls very early Date: Tue, 02 Nov 2010 11:59:48 -0400 Message-ID: <4CD03574.6090708@redhat.com> References: <20101031130629.GA18224@infradead.org> <20101102151103.GA4726@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Christoph Hellwig Return-path: Received: from mx1.redhat.com ([209.132.183.28]:52154 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752818Ab0KBP75 (ORCPT ); Tue, 2 Nov 2010 11:59:57 -0400 In-Reply-To: <20101102151103.GA4726@infradead.org> Sender: kvm-owner@vger.kernel.org List-ID: On 11/02/2010 11:11 AM, Christoph Hellwig wrote: > On Sun, Oct 31, 2010 at 09:06:29AM -0400, Christoph Hellwig wrote: > > With Linus' git tree from today I can't boot qemu when using kvm. It > > seems to do fine, just glacially slow without -enable-kvm. The command > > simplest command line that fails is: > > > > /opt/qemu/bin/qemu-system-x86_64 -enable-kvm > > This issue was caused by commit 9581d442b9058d3699b4be568b6e5eae38a41493 > > "KVM: Fix fs/gs reload oops with invalid ldt" > Interesting, I guess we corrupt %fs on x86_64. Intel or AMD? -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.