2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/_eventhandler.h>
32 * VM Generation Counter driver
34 * This driver has two functions: first, it provides a system event (both in
35 * the kernel EVENTHANDLER framework as well as a userspace devctl event)
36 * whenever a VM has been (HyperV doc, for example):
37 * - Snapped and the snapshot is executing
38 * - Recovered from backup
39 * - Failed over in a HA setup
40 * - Imported, copied, or cloned
41 * - And unspecified if VM configuration changes might cause a changed
44 * Second, it can read the current VM generation counter, a 128-bit GUID.
46 typedef void (*vmgenc_handler)(void *);
47 EVENTHANDLER_DECLARE(acpi_vmgenc_event, vmgenc_handler);