From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH] kvm: x86: Prevent sign extension of DR7 in guest debugging mode Date: Mon, 27 Dec 2010 17:38:14 +0200 Message-ID: <4D18B2E6.6080901@redhat.com> References: <4D18A98F.3070303@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , kvm , qemu-devel To: Jan Kiszka Return-path: Received: from mx1.redhat.com ([209.132.183.28]:51051 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754197Ab0L0PiT (ORCPT ); Mon, 27 Dec 2010 10:38:19 -0500 In-Reply-To: <4D18A98F.3070303@web.de> Sender: kvm-owner@vger.kernel.org List-ID: On 12/27/2010 04:58 PM, Jan Kiszka wrote: > From: Jan Kiszka > > This unbreaks guest debugging when the 4th hardware breakpoint used for > guest debugging is a watchpoint of 4 or 8 byte lenght. The 31st bit of > DR7 is set in that case and used to cause a sign extension to the high > word which was breaking the guest state (vm entry failure). Applied to uq/master, thanks. -- error compiling committee.c: too many arguments to function