From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: Re: bad leakage between virtual machines? Date: Wed, 20 Jan 2010 18:36:54 +0100 Message-ID: <4B573F36.7000703@siemens.com> References: <20100115101706.4fb8897a@tomh.ccur.com> <4B50A7F5.4020708@siemens.com> <20100115132128.1c04ed46@tomh.ccur.com> <4B50B639.3050203@siemens.com> <4B564BC9.5010407@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Tom Horsley Return-path: Received: from goliath.siemens.de ([192.35.17.28]:20771 "EHLO goliath.siemens.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752808Ab0ATRg5 (ORCPT ); Wed, 20 Jan 2010 12:36:57 -0500 In-Reply-To: <4B564BC9.5010407@web.de> Sender: kvm-owner@vger.kernel.org List-ID: Jan Kiszka wrote: > Jan Kiszka wrote: >> Tom Horsley wrote: >>> On Fri, 15 Jan 2010 18:37:57 +0100 >>> Jan Kiszka wrote: >>> >>>> Tom Horsley wrote: >>>>> I just submitted this fedora bug with lots of details: >>>>> >>>>> https://bugzilla.redhat.com/show_bug.cgi?id=555788 >>>>> >>>>> It sure seems to me like the contents of the debug >>>>> address trap registers are leaking across virtual machines >>>>> (at least for opterons on this motherboard :-). >>>> Are only AMD boxes affected, or did you also test on Intel? >>> I haven't explicitly tested on Intel, but we did just see a >>> compile on a guest on the Intel host also get the same >>> Breakpoint/Trap error out of the blue, so it looks as if it >>> does happen on intel as well as amd. >> OK, will have a look at your test application once time permits. >> > > Just did so with bleeding-edge kvm-kmod and qemu-kvm-0.12.1.2 on an > Intel host. But nothing exciting happened. > > Are you sure that test on an Intel host was really an Intel? In your bug > report you write the contrary. Anyway, will have my hands on an AMD box > tomorrow and try to reproduce there. No success reproducing on AMD either. This time I'm using kvm-kmod-2.6.32.3 (so none of today's debug register patches applied) and qemu-kvm-0.12.1.2. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux