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 Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
30 /* Returns a short identifier for the various VM implementations */
31 int detect_vm(const char **id) {
32 _cleanup_free_ char *cpuinfo_contents = NULL;
35 #if defined(__i386__) || defined(__x86_64__)
37 /* Both CPUID and DMI are x86 specific interfaces... */
39 static const char *const dmi_vendors[] = {
40 "/sys/class/dmi/id/sys_vendor",
41 "/sys/class/dmi/id/board_vendor",
42 "/sys/class/dmi/id/bios_vendor"
45 static const char dmi_vendor_table[] =
47 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
50 "Microsoft Corporation\0" "microsoft\0"
51 "innotek GmbH\0" "oracle\0"
55 static const char cpuid_vendor_table[] =
56 "XenVMMXenVMM\0" "xen\0"
58 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
59 "VMwareVMware\0" "vmware\0"
60 /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
61 "Microsoft Hv\0" "microsoft\0";
71 _cleanup_free_ char *hvtype = NULL;
73 /* Try high-level hypervisor sysfs file first:
75 * https://bugs.freedesktop.org/show_bug.cgi?id=61491 */
76 r = read_one_line_file("/sys/hypervisor/type", &hvtype);
78 if (streq(hvtype, "xen")) {
84 } else if (r != -ENOENT)
87 /* http://lwn.net/Articles/301888/ */
89 #if defined (__i386__)
92 #elif defined (__amd64__)
97 /* First detect whether there is a hypervisor */
99 __asm__ __volatile__ (
100 /* ebx/rbx is being used for PIC! */
101 " push %%"REG_b" \n\t"
103 " pop %%"REG_b" \n\t"
105 : "=a" (eax), "=c" (ecx)
109 hypervisor = !!(ecx & 0x80000000U);
113 /* There is a hypervisor, see what it is */
115 __asm__ __volatile__ (
116 /* ebx/rbx is being used for PIC! */
117 " push %%"REG_b" \n\t"
119 " mov %%ebx, %1 \n\t"
120 " pop %%"REG_b" \n\t"
122 : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
126 NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
127 if (streq(sig.text, j)) {
136 for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
137 _cleanup_free_ char *s = NULL;
138 const char *found = NULL;
140 r = read_one_line_file(dmi_vendors[i], &s);
148 NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
149 if (startswith(s, j))
160 if (hypervisor || hvtype) {
169 /* Detect User-Mode Linux by reading /proc/cpuinfo */
170 r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
173 if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) {
181 int detect_container(const char **id) {
182 _cleanup_free_ char *e = NULL;
185 /* Unfortunately many of these operations require root access
186 * in one way or another */
188 r = running_in_chroot();
199 /* /proc/vz exists in container and outside of the container,
200 * /proc/bc only outside of the container. */
201 if (access("/proc/vz", F_OK) >= 0 &&
202 access("/proc/bc", F_OK) < 0) {
210 r = getenv_for_pid(1, "container", &e);
214 /* We only recognize a selected few here, since we want to
215 * enforce a redacted namespace */
216 if (streq(e, "lxc")) {
219 } else if (streq(e, "lxc-libvirt")) {
222 } else if (streq(e, "systemd-nspawn")) {
224 *id = "systemd-nspawn";
233 /* Returns a short identifier for the various VM/container implementations */
234 Virtualization detect_virtualization(const char **id) {
236 static __thread Virtualization cached_virt = _VIRTUALIZATION_INVALID;
237 static __thread const char *cached_id = NULL;
243 if (_likely_(cached_virt >= 0)) {
245 if (id && cached_virt > 0)
251 r = detect_container(&_id);
256 v = VIRTUALIZATION_CONTAINER;
265 v = VIRTUALIZATION_VM;
269 v = VIRTUALIZATION_NONE;