1 /* $NetBSD: isqemu.h,v 1.6 2021/12/15 09:19:28 gson Exp $ */
2
3 /*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of The NetBSD Foundation nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34 #include <sys/param.h>
35 #include <sys/sysctl.h>
36 #include <sys/drvctlio.h>
37 #include <sys/ioctl.h>
38 #include <fcntl.h>
39 #include <stdbool.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <errno.h>
43 #include <err.h>
44 #include <unistd.h>
45
46 static __inline bool
isQEMU(void)47 isQEMU(void) {
48 struct devlistargs dla = {
49 .l_devname = "qemufwcfg0",
50 .l_childname = NULL,
51 .l_children = 0,
52 };
53 int fd = open(DRVCTLDEV, O_RDONLY, 0);
54 if (fd == -1)
55 return false;
56 if (ioctl(fd, DRVLISTDEV, &dla) == -1) {
57 close(fd);
58 return false;
59 }
60 close(fd);
61 return true;
62 }
63
64 static __inline bool
isQEMU_TCG(void)65 isQEMU_TCG(void) {
66 #if defined(__i386__) || defined(__x86_64__)
67 char name[1024];
68 size_t len = sizeof(name);
69
70 if (sysctlbyname("machdep.cpu_brand", name, &len, NULL, 0) == -1) {
71 if (errno == ENOENT)
72 return false;
73 err(EXIT_FAILURE, "sysctl");
74 }
75 if (strstr(name, "QEMU") == NULL)
76 return false;
77 if (sysctlbyname("machdep.hypervisor", name, &len, NULL, 0) == -1) {
78 if (errno == ENOENT)
79 return true;
80 err(EXIT_FAILURE, "sysctl");
81 }
82 if (strcmp(name, "KVM") == 0)
83 return false;
84 return true;
85 #endif
86 return false;
87 }
88
89 #ifdef TEST
90 int
main(void)91 main(void) {
92 return isQEMU();
93 }
94 #endif
95