1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 /* Returns a short identifier for the various VM implementations */
30 int detect_vm(const char **id
) {
32 #if defined(__i386__) || defined(__x86_64__)
34 /* Both CPUID and DMI are x86 specific interfaces... */
36 static const char *const dmi_vendors
[] = {
37 "/sys/class/dmi/id/sys_vendor",
38 "/sys/class/dmi/id/board_vendor",
39 "/sys/class/dmi/id/bios_vendor"
42 static const char dmi_vendor_table
[] =
44 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
47 "Microsoft Corporation\0" "microsoft\0"
48 "innotek GmbH\0" "oracle\0"
52 static const char cpuid_vendor_table
[] =
53 "XenVMMXenVMM\0" "xen\0"
55 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
56 "VMwareVMware\0" "vmware\0"
57 /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
58 "Microsoft Hv\0" "microsoft\0";
69 /* http://lwn.net/Articles/301888/ */
72 #if defined (__i386__)
75 #elif defined (__amd64__)
80 /* First detect whether there is a hypervisor */
82 __asm__
__volatile__ (
83 /* ebx/rbx is being used for PIC! */
84 " push %%"REG_b
" \n\t"
88 : "=a" (eax
), "=c" (ecx
)
92 hypervisor
= !!(ecx
& 0x80000000U
);
96 /* There is a hypervisor, see what it is */
98 __asm__
__volatile__ (
99 /* ebx/rbx is being used for PIC! */
100 " push %%"REG_b
" \n\t"
102 " mov %%ebx, %1 \n\t"
103 " pop %%"REG_b
" \n\t"
105 : "=a" (eax
), "=r" (sig
.sig32
[0]), "=c" (sig
.sig32
[1]), "=d" (sig
.sig32
[2])
109 NULSTR_FOREACH_PAIR(j
, k
, cpuid_vendor_table
)
110 if (streq(sig
.text
, j
)) {
119 for (i
= 0; i
< ELEMENTSOF(dmi_vendors
); i
++) {
122 const char *found
= NULL
;
124 if ((r
= read_one_line_file(dmi_vendors
[i
], &s
)) < 0) {
131 NULSTR_FOREACH_PAIR(j
, k
, dmi_vendor_table
)
132 if (startswith(s
, j
))
155 int detect_container(const char **id
) {
158 /* Unfortunately many of these operations require root access
159 * in one way or another */
164 if (running_in_chroot() > 0) {
172 /* /proc/vz exists in container and outside of the container,
173 * /proc/bc only outside of the container. */
174 if (access("/proc/vz", F_OK
) >= 0 &&
175 access("/proc/bc", F_OK
) < 0) {
183 f
= fopen("/proc/1/environ", "re");
191 for (i
= 0; i
< sizeof(line
)-1; i
++) {
195 if (_unlikely_(c
== EOF
)) {
205 if (streq(line
, "container=lxc")) {
212 } else if (streq(line
, "container=systemd-nspawn")) {
216 *id
= "systemd-nspawn";
219 } else if (startswith(line
, "container=")) {
232 f
= fopen("/proc/self/cgroup", "re");
236 char line
[LINE_MAX
], *p
;
238 if (!fgets(line
, sizeof(line
), f
))
241 p
= strchr(strstrip(line
), ':');
245 if (strncmp(p
, ":ns:", 4))
248 if (!streq(p
, ":ns:/")) {
264 /* Returns a short identifier for the various VM/container implementations */
265 Virtualization
detect_virtualization(const char **id
) {
267 static __thread Virtualization cached_virt
= _VIRTUALIZATION_INVALID
;
268 static __thread
const char *cached_id
= NULL
;
274 if (_likely_(cached_virt
>= 0)) {
276 if (id
&& cached_virt
> 0)
282 r
= detect_container(&_id
);
287 v
= VIRTUALIZATION_CONTAINER
;
296 v
= VIRTUALIZATION_VM
;
300 v
= VIRTUALIZATION_NONE
;