From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58182) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ymh54-0003Yz-Dp for qemu-devel@nongnu.org; Mon, 27 Apr 2015 07:20:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Ymh51-000174-Bu for qemu-devel@nongnu.org; Mon, 27 Apr 2015 07:20:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45664) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ymh50-00014J-TV for qemu-devel@nongnu.org; Mon, 27 Apr 2015 07:20:03 -0400 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id t3RBK2Vd002570 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Mon, 27 Apr 2015 07:20:02 -0400 From: Gal Hammer Date: Mon, 27 Apr 2015 14:19:47 +0300 Message-Id: <1430133591-6197-2-git-send-email-ghammer@redhat.com> In-Reply-To: <1430133591-6197-1-git-send-email-ghammer@redhat.com> References: <1430133591-6197-1-git-send-email-ghammer@redhat.com> Subject: [Qemu-devel] [PATCH V15 1/5] docs: vm generation id device's description List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Gal Hammer , imammedo@redhat.com, mst@redhat.com Signed-off-by: Gal Hammer --- docs/specs/vmgenid.txt | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 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..86ce6ab --- /dev/null +++ b/docs/specs/vmgenid.txt @@ -0,0 +1,35 @@ +VIRTUAL MACHINE GENERATION ID +============================= + +Copyright (C) 2014 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 sysbus device with the following ACPI ID: +"QEMU0002". + +The device adds a "vmgenid.uuid" property, which can be modified using +the -global command line argument or the QMP interface. + +The device uses a fixed memory resource: 0xfedf0000-0xfedf000f to store +the GUID's buffer. + +According to the specification, any change to the GUID executes an +ACPI notification. The vmgenid device triggers the GPE._E00 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. -- 2.1.0