From patchwork Thu Jan 28 10:54:24 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Igor Mammedov X-Patchwork-Id: 8149151 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 02FE4BEEE5 for ; Thu, 28 Jan 2016 10:56:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 211B720364 for ; Thu, 28 Jan 2016 10:56:39 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 43A3A20154 for ; Thu, 28 Jan 2016 10:56:38 +0000 (UTC) Received: from localhost ([::1]:55256 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aOkFh-00059K-MO for patchwork-qemu-devel@patchwork.kernel.org; Thu, 28 Jan 2016 05:56:37 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35203) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aOkDn-0001mi-2Y for qemu-devel@nongnu.org; Thu, 28 Jan 2016 05:54:40 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aOkDm-0005Ce-0F for qemu-devel@nongnu.org; Thu, 28 Jan 2016 05:54:39 -0500 Received: from mx1.redhat.com ([209.132.183.28]:51887) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aOkDl-0005Ca-RK for qemu-devel@nongnu.org; Thu, 28 Jan 2016 05:54:37 -0500 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 5D48E445A7 for ; Thu, 28 Jan 2016 10:54:37 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq.redhat.com (dell-r430-03.lab.eng.brq.redhat.com [10.34.112.60]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u0SAsUrr001804; Thu, 28 Jan 2016 05:54:35 -0500 From: Igor Mammedov To: qemu-devel@nongnu.org Date: Thu, 28 Jan 2016 11:54:24 +0100 Message-Id: <1453978470-222624-3-git-send-email-imammedo@redhat.com> In-Reply-To: <1453978470-222624-1-git-send-email-imammedo@redhat.com> References: <1453978470-222624-1-git-send-email-imammedo@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: ehabkost@redhat.com, mst@redhat.com, ghammer@redhat.com, lersek@redhat.com, lcapitulino@redhat.com Subject: [Qemu-devel] [PATCH v19 2/9] docs: vm generation id device's description X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Gal Hammer Signed-off-by: Gal Hammer Signed-off-by: Igor Mammedov Reviewed-by: Eric Blake --- docs/specs/vmgenid.txt | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 docs/specs/vmgenid.txt diff --git a/docs/specs/vmgenid.txt b/docs/specs/vmgenid.txt new file mode 100644 index 0000000..462d17f --- /dev/null +++ b/docs/specs/vmgenid.txt @@ -0,0 +1,36 @@ +VIRTUAL MACHINE GENERATION ID +============================= + +Copyright (C) 2016 Red Hat, Inc. + +This work is licensed under the terms of the GNU GPL, version 2 or later. +See the COPYING file in the top-level directory. + +=== + +The VM generation ID (vmgenid) device is an emulated device which +exposes a 128-bit, cryptographically random, integer value identifier. +This allows management applications (e.g. libvirt) to notify the guest +operating system when the virtual machine is executed with a different +configuration (e.g. snapshot execution or creation from a template). + +This is specified on the web at: http://go.microsoft.com/fwlink/?LinkId=260709 + +--- + +The vmgenid device is a PCI device with the following ACPI ID: "QEMU0003". + +The device has a "vmgenid.guid" property, which can be set using +the command line argument or the QMP interface. +For example: +QEMU -device vmgenid,id=FOO,guid="324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87" + +Or to change guid in runtime use: + qom-set "/machine/peripheral/FOO.guid" "124e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87" + +According to the specification, any change to the GUID executes an +ACPI notification. The vmgenid device triggers the \_GPE._E00 handler +which executes the ACPI Notify operation. + +Although not specified in Microsoft's document, it is assumed that the +device is expected to use the little-endian system.