From owner-freebsd-stable@FreeBSD.ORG Mon Feb 8 20:05:45 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B50E210656AA for ; Mon, 8 Feb 2010 20:05:45 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42]) by mx1.freebsd.org (Postfix) with ESMTP id 855AF8FC20 for ; Mon, 8 Feb 2010 20:05:45 +0000 (UTC) Received: from bigwig.baldwin.cx (66.111.2.69.static.nyinternet.net [66.111.2.69]) by cyrus.watson.org (Postfix) with ESMTPSA id 380C946B0C; Mon, 8 Feb 2010 15:05:45 -0500 (EST) Received: from jhbbsd.localnet (smtp.hudson-trading.com [209.249.190.9]) by bigwig.baldwin.cx (Postfix) with ESMTPA id 7B7C98A01F; Mon, 8 Feb 2010 15:05:44 -0500 (EST) From: John Baldwin To: Kostik Belousov Date: Mon, 8 Feb 2010 15:05:35 -0500 User-Agent: KMail/1.12.1 (FreeBSD/7.2-CBSD-20100120; KDE/4.3.1; amd64; ; ) References: <4B6B89E7.8030002@sdf.lonestar.org> <201002081442.33579.jhb@freebsd.org> <20100208194651.GP9991@deviant.kiev.zoral.com.ua> In-Reply-To: <20100208194651.GP9991@deviant.kiev.zoral.com.ua> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Message-Id: <201002081505.35643.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0.1 (bigwig.baldwin.cx); Mon, 08 Feb 2010 15:05:44 -0500 (EST) X-Virus-Scanned: clamav-milter 0.95.1 at bigwig.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-1.4 required=4.2 tests=AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on bigwig.baldwin.cx Cc: Tom McLaughlin , freebsd-stable@freebsd.org Subject: Re: Recent MFC to 7 causes crash on VMware ESXi X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Feb 2010 20:05:45 -0000 On Monday 08 February 2010 2:46:51 pm Kostik Belousov wrote: > On Mon, Feb 08, 2010 at 02:42:33PM -0500, John Baldwin wrote: > > On Monday 08 February 2010 1:51:46 pm Kostik Belousov wrote: > > > On Mon, Feb 08, 2010 at 01:15:06PM -0500, John Baldwin wrote: > > > > > > I thought the old condition only happened under VMware? > > > > > > > > > > Reports I got where from XEN. > > > > > > > > Ok. Those would also be covered under the vm_guest test as it is > > > > non-zero for Xen, VMware, Parallels, etc. > > > > > > What I said was suggestion and not objection. Ignore me. > > > > Were there any reports of problems with Intel CPUs that weren't under a > > virtualization system? If so, we should keep the test, but my understanding > > was that the test was only true under specific virtualization environments. > > Forcing Intel CPU to use CLFLUSH, by clearing SS bit, caused > reserved trap on Pentium M at least. My concern is that if Intel > makes some stripped-down CPU with CLFLUSH but without SS logic, > we would be affected. Hmm, I am content to just workaround things that we know are broken for enough. There are an infinite number of possibilities as far as if future products may be broken. I think for that case we should wait and add a workaround to disable it as new parts that are broken become available. -- John Baldwin