From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51841) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z4raC-0002Ib-2K for qemu-devel@nongnu.org; Tue, 16 Jun 2015 10:11:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z4ra7-0006ED-AE for qemu-devel@nongnu.org; Tue, 16 Jun 2015 10:11:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37383) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z4ra7-0006E5-41 for qemu-devel@nongnu.org; Tue, 16 Jun 2015 10:11:15 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id D6F5533B363 for ; Tue, 16 Jun 2015 14:11:14 +0000 (UTC) From: Gal Hammer Date: Tue, 16 Jun 2015 17:11:00 +0300 Message-Id: <1434463863-26560-2-git-send-email-ghammer@redhat.com> In-Reply-To: <1434463863-26560-1-git-send-email-ghammer@redhat.com> References: <1434463863-26560-1-git-send-email-ghammer@redhat.com> Subject: [Qemu-devel] [PATCH V16 1/4] 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 , pbonzini@redhat.com, imammedo@redhat.com, mst@redhat.com Signed-off-by: Gal Hammer --- docs/specs/vmgenid.txt | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 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..d06977a --- /dev/null +++ b/docs/specs/vmgenid.txt @@ -0,0 +1,33 @@ +VIRTUAL MACHINE GENERATION ID +============================= + +Copyright (C) 2015 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 +is expected to exposes a 128-bit, cryptographically random, integer value +identifier, provided by a management system (It is NOT in the device's +responsibilty to ensure that the value is cryptographically random). + +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 device with the following ACPI ID: "QEMU0002". + +It has two properties: + +uuid - The virtual machine generation ID (A required UUID string) +addr - The uuid memory location (A 64-bit address, defaults to 0xfedf0000) + +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. -- 2.1.0