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";
63 static __thread int cached_found = -1;
64 static __thread const char *cached_id = NULL;
74 _cleanup_free_ char *hvtype = NULL;
75 const char *_id = NULL;
77 if (_likely_(cached_found >= 0)) {
85 /* Try high-level hypervisor sysfs file first:
87 * https://bugs.freedesktop.org/show_bug.cgi?id=61491 */
88 r = read_one_line_file("/sys/hypervisor/type", &hvtype);
90 if (streq(hvtype, "xen")) {
95 } else if (r != -ENOENT)
98 /* http://lwn.net/Articles/301888/ */
100 #if defined (__i386__)
103 #elif defined (__amd64__)
108 /* First detect whether there is a hypervisor */
110 __asm__ __volatile__ (
111 /* ebx/rbx is being used for PIC! */
112 " push %%"REG_b" \n\t"
114 " pop %%"REG_b" \n\t"
116 : "=a" (eax), "=c" (ecx)
120 hypervisor = !!(ecx & 0x80000000U);
124 /* There is a hypervisor, see what it is */
126 __asm__ __volatile__ (
127 /* ebx/rbx is being used for PIC! */
128 " push %%"REG_b" \n\t"
130 " mov %%ebx, %1 \n\t"
131 " pop %%"REG_b" \n\t"
133 : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
137 NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
138 if (streq(sig.text, j)) {
145 for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
146 _cleanup_free_ char *s = NULL;
148 r = read_one_line_file(dmi_vendors[i], &s);
156 NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
157 if (startswith(s, j)) {
164 if (hypervisor || hvtype) {
172 /* Detect User-Mode Linux by reading /proc/cpuinfo */
173 r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
176 if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) {
194 int detect_container(const char **id) {
196 static __thread int cached_found = -1;
197 static __thread const char *cached_id = NULL;
199 _cleanup_free_ char *e = NULL;
200 const char *_id = NULL;
203 if (_likely_(cached_found >= 0)) {
211 /* Unfortunately many of these operations require root access
212 * in one way or another */
214 r = running_in_chroot();
222 /* /proc/vz exists in container and outside of the container,
223 * /proc/bc only outside of the container. */
224 if (access("/proc/vz", F_OK) >= 0 &&
225 access("/proc/bc", F_OK) < 0) {
231 r = getenv_for_pid(1, "container", &e);
237 /* We only recognize a selected few here, since we want to
238 * enforce a redacted namespace */
241 else if (streq(e, "lxc-libvirt"))
243 else if (streq(e, "systemd-nspawn"))
244 _id = "systemd-nspawn";
258 /* Returns a short identifier for the various VM/container implementations */
259 Virtualization detect_virtualization(const char **id) {
262 r = detect_container(id);
266 return VIRTUALIZATION_CONTAINER;
272 return VIRTUALIZATION_VM;
274 return VIRTUALIZATION_NONE;