From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50231) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1z3H-0005yA-A8 for qemu-devel@nongnu.org; Mon, 08 Jun 2015 11:33:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z1z3C-0004mg-5Q for qemu-devel@nongnu.org; Mon, 08 Jun 2015 11:33:27 -0400 Received: from mail-wi0-x22b.google.com ([2a00:1450:400c:c05::22b]:33648) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1z3B-0004mT-VP for qemu-devel@nongnu.org; Mon, 08 Jun 2015 11:33:22 -0400 Received: by wiwd19 with SMTP id d19so90438918wiw.0 for ; Mon, 08 Jun 2015 08:33:21 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <5575B5BF.40401@redhat.com> Date: Mon, 08 Jun 2015 17:33:19 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <1430133591-6197-1-git-send-email-ghammer@redhat.com> <1430133591-6197-5-git-send-email-ghammer@redhat.com> <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> In-Reply-To: <20150608171921-mutt-send-email-mst@redhat.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit 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: "Michael S. Tsirkin" Cc: Gal Hammer , imammedo@redhat.com, qemu-devel@nongnu.org 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 > 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. >