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) {
33 #if defined(__i386__) || defined(__x86_64__)
35 /* Both CPUID and DMI are x86 specific interfaces... */
37 static const char *const dmi_vendors[] = {
38 "/sys/class/dmi/id/sys_vendor",
39 "/sys/class/dmi/id/board_vendor",
40 "/sys/class/dmi/id/bios_vendor"
43 static const char dmi_vendor_table[] =
45 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
48 "Microsoft Corporation\0" "microsoft\0"
49 "innotek GmbH\0" "oracle\0"
53 static const char cpuid_vendor_table[] =
54 "XenVMMXenVMM\0" "xen\0"
56 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
57 "VMwareVMware\0" "vmware\0"
58 /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
59 "Microsoft Hv\0" "microsoft\0";
70 /* http://lwn.net/Articles/301888/ */
73 #if defined (__i386__)
76 #elif defined (__amd64__)
81 /* First detect whether there is a hypervisor */
83 __asm__ __volatile__ (
84 /* ebx/rbx is being used for PIC! */
85 " push %%"REG_b" \n\t"
89 : "=a" (eax), "=c" (ecx)
93 hypervisor = !!(ecx & 0x80000000U);
97 /* There is a hypervisor, see what it is */
99 __asm__ __volatile__ (
100 /* ebx/rbx is being used for PIC! */
101 " push %%"REG_b" \n\t"
103 " mov %%ebx, %1 \n\t"
104 " pop %%"REG_b" \n\t"
106 : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
110 NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
111 if (streq(sig.text, j)) {
120 for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
123 const char *found = NULL;
125 if ((r = read_one_line_file(dmi_vendors[i], &s)) < 0) {
132 NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
133 if (startswith(s, j))
156 int detect_container(const char **id) {
160 /* Unfortunately many of these operations require root access
161 * in one way or another */
163 r = running_in_chroot();
174 /* /proc/vz exists in container and outside of the container,
175 * /proc/bc only outside of the container. */
176 if (access("/proc/vz", F_OK) >= 0 &&
177 access("/proc/bc", F_OK) < 0) {
185 r = getenv_for_pid(1, "container", &e);
189 /* We only recognize a selected few here, since we want to
190 * enforce a redacted namespace */
191 if (streq(e, "lxc")) {
194 } else if (streq(e, "lxc-libvirt")) {
197 } else if (streq(e, "systemd-nspawn")) {
199 *id = "systemd-nspawn";
210 /* Returns a short identifier for the various VM/container implementations */
211 Virtualization detect_virtualization(const char **id) {
213 static __thread Virtualization cached_virt = _VIRTUALIZATION_INVALID;
214 static __thread const char *cached_id = NULL;
220 if (_likely_(cached_virt >= 0)) {
222 if (id && cached_virt > 0)
228 r = detect_container(&_id);
233 v = VIRTUALIZATION_CONTAINER;
242 v = VIRTUALIZATION_VM;
246 v = VIRTUALIZATION_NONE;