From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43026) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V5Ai6-000575-Sj for qemu-devel@nongnu.org; Fri, 02 Aug 2013 04:27:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1V5Ai1-0001v9-RV for qemu-devel@nongnu.org; Fri, 02 Aug 2013 04:27:42 -0400 Received: from mail-wi0-x235.google.com ([2a00:1450:400c:c05::235]:37383) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V5Ai1-0001uw-KK for qemu-devel@nongnu.org; Fri, 02 Aug 2013 04:27:37 -0400 Received: by mail-wi0-f181.google.com with SMTP id en1so281772wid.2 for ; Fri, 02 Aug 2013 01:27:36 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <51FB6D73.9090902@redhat.com> Date: Fri, 02 Aug 2013 10:27:31 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <1375362537.4891.28.camel@localhost.localdomain> <1375427079-16822-1-git-send-email-hutao@cn.fujitsu.com> In-Reply-To: <1375427079-16822-1-git-send-email-hutao@cn.fujitsu.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH for-1.6 1/2] don't create pvpanic device by default. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Hu Tao Cc: qemu-devel@nongnu.org On 08/02/2013 09:04 AM, Hu Tao wrote: > The problem with pvpanic being an internal device is that VMs running > operating systems without a driver for this device will have problems > when qemu will be upgraded (from qemu without this pvpanic). > > The outcome may be, for example: in Windows(let's say XP) the Device > manager will open a "new device" wizard and the device will appear as > an unrecognized device. On a cluster with hundreds of such VMs, If > that cluster has a health monitoring service it may show all the VMs > in a "not healthy" state. > > Reported-by: Marcel Apfelbaum > Signed-off-by: Hu Tao NACK, this is premature. It is fundamentally a firmware problem. We have time to apply an even smaller patch that doesn't set has_pvpanic to true, and delay the whole feature to 1.7, if we do not fix the firmware in the next two weeks. Paolo