From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54088) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1zAv-0003Zq-B8 for qemu-devel@nongnu.org; Mon, 08 Jun 2015 11:41:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z1zAr-0002gt-BQ for qemu-devel@nongnu.org; Mon, 08 Jun 2015 11:41:21 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48275) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1zAr-0002gD-6B for qemu-devel@nongnu.org; Mon, 08 Jun 2015 11:41:17 -0400 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id CAA1219F249 for ; Mon, 8 Jun 2015 15:41:16 +0000 (UTC) Date: Mon, 8 Jun 2015 17:41:14 +0200 From: "Michael S. Tsirkin" Message-ID: <20150608174021-mutt-send-email-mst@redhat.com> References: <556F2D51.2000203@redhat.com> <55759BB8.3010604@redhat.com> <55759C1B.7000905@redhat.com> <55759E0A.3090102@redhat.com> <55759EC2.5090802@redhat.com> <20150608135854.GC19157@redhat.com> <20150608165951-mutt-send-email-mst@redhat.com> <5575B20B.9000502@redhat.com> <20150608171921-mutt-send-email-mst@redhat.com> <5575B5BF.40401@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5575B5BF.40401@redhat.com> Subject: Re: [Qemu-devel] [PATCH V15 4/5] i386: add a Virtual Machine Generation ID device List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: Gal Hammer , imammedo@redhat.com, qemu-devel@nongnu.org On Mon, Jun 08, 2015 at 05:33:19PM +0200, Paolo Bonzini wrote: > > > On 08/06/2015 17:22, Michael S. Tsirkin wrote: > > On Mon, Jun 08, 2015 at 05:17:31PM +0200, Paolo Bonzini wrote: > >> > >> > >> On 08/06/2015 17:01, Michael S. Tsirkin wrote: > >>> Are there applications that would actually use this? For microsoft this > >>> seems to be mostly driven by ActiveDirectory needs. > >>> It seems quite possible that applications solve the problem > >>> differently on Linux. > >> > >> I'm not aware of a different solution to the problem on Linux. > > > > Adding it by default for everyone still seems too aggressive. > > We had a ton of pain with pvpanic exactly because of a > > similar "can't hurt" approach. > > The ton of pain was due to enabling it in ACPI unconditionally. We can > leave it disabled in the UUID is all zeroes, for example. > > Paolo Not if libvirt insists on adding a non zero uuid to all VMs unconditionally. This is what I was arguing against really. > > I think a better approach would be to merge the code in qemu, > > merge a linux driver. Once that's available, and some apps use it, > > enabling it by default will seem more reasonable. > >