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/>.
27 #include "process-util.h"
31 static int detect_vm_cpuid(const char **_id) {
33 /* Both CPUID and DMI are x86 specific interfaces... */
34 #if defined(__i386__) || defined(__x86_64__)
36 static const char cpuid_vendor_table[] =
37 "XenVMMXenVMM\0" "xen\0"
39 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
40 "VMwareVMware\0" "vmware\0"
41 /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
42 "Microsoft Hv\0" "microsoft\0";
52 /* http://lwn.net/Articles/301888/ */
54 #if defined (__i386__)
57 #elif defined (__amd64__)
62 /* First detect whether there is a hypervisor */
64 __asm__ __volatile__ (
65 /* ebx/rbx is being used for PIC! */
66 " push %%"REG_b" \n\t"
70 : "=a" (eax), "=c" (ecx)
74 hypervisor = !!(ecx & 0x80000000U);
78 /* There is a hypervisor, see what it is */
80 __asm__ __volatile__ (
81 /* ebx/rbx is being used for PIC! */
82 " push %%"REG_b" \n\t"
87 : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
91 NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
92 if (streq(sig.text, j)) {
105 static int detect_vm_devicetree(const char **_id) {
106 #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__)
107 _cleanup_free_ char *hvtype = NULL;
110 r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype);
112 if (streq(hvtype, "linux,kvm")) {
115 } else if (strstr(hvtype, "xen")) {
119 } else if (r == -ENOENT) {
120 _cleanup_closedir_ DIR *dir = NULL;
123 dir = opendir("/proc/device-tree");
130 FOREACH_DIRENT(dent, dir, return -errno) {
131 if (strstr(dent->d_name, "fw-cfg")) {
141 static int detect_vm_dmi(const char **_id) {
143 /* Both CPUID and DMI are x86 specific interfaces... */
144 #if defined(__i386__) || defined(__x86_64__)
146 static const char *const dmi_vendors[] = {
147 "/sys/class/dmi/id/sys_vendor",
148 "/sys/class/dmi/id/board_vendor",
149 "/sys/class/dmi/id/bios_vendor"
152 static const char dmi_vendor_table[] =
154 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
155 "VMware\0" "vmware\0"
157 "innotek GmbH\0" "oracle\0"
162 for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
163 _cleanup_free_ char *s = NULL;
167 r = read_one_line_file(dmi_vendors[i], &s);
175 NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
176 if (startswith(s, j)) {
186 /* Returns a short identifier for the various VM implementations */
187 int detect_vm(const char **id) {
188 _cleanup_free_ char *domcap = NULL, *cpuinfo_contents = NULL;
189 static thread_local int cached_found = -1;
190 static thread_local const char *cached_id = NULL;
191 const char *_id = NULL, *_id_cpuid = NULL;
194 if (_likely_(cached_found >= 0)) {
202 /* Try xen capabilities file first, if not found try high-level hypervisor sysfs file:
204 * https://bugs.freedesktop.org/show_bug.cgi?id=77271 */
205 r = read_one_line_file("/proc/xen/capabilities", &domcap);
207 char *cap, *i = domcap;
209 while ((cap = strsep(&i, ",")))
210 if (streq(cap, "control_d"))
220 } else if (r == -ENOENT) {
221 _cleanup_free_ char *hvtype = NULL;
223 r = read_one_line_file("/sys/hypervisor/type", &hvtype);
225 if (streq(hvtype, "xen")) {
230 } else if (r != -ENOENT)
235 /* this will set _id to "other" and return 0 for unknown hypervisors */
236 r = detect_vm_cpuid(&_id);
238 /* finish when found a known hypervisor other than kvm */
239 if (r < 0 || (r > 0 && !streq(_id, "kvm")))
244 r = detect_vm_dmi(&_id);
246 /* kvm with and without Virtualbox */
247 if (streq_ptr(_id_cpuid, "kvm")) {
248 if (r > 0 && streq(_id, "oracle"))
256 /* information from dmi */
260 r = detect_vm_devicetree(&_id);
270 /* Detect User-Mode Linux by reading /proc/cpuinfo */
271 r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
274 if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) {
280 #if defined(__s390__)
282 _cleanup_free_ char *t = NULL;
284 r = get_status_field("/proc/sysinfo", "VM00 Control Program:", &t);
286 if (streq(t, "z/VM"))
309 int detect_container(const char **id) {
311 static thread_local int cached_found = -1;
312 static thread_local const char *cached_id = NULL;
314 _cleanup_free_ char *m = NULL;
315 const char *_id = NULL, *e = NULL;
318 if (_likely_(cached_found >= 0)) {
326 /* /proc/vz exists in container and outside of the container,
327 * /proc/bc only outside of the container. */
328 if (access("/proc/vz", F_OK) >= 0 &&
329 access("/proc/bc", F_OK) < 0) {
336 /* If we are PID 1 we can just check our own
337 * environment variable */
339 e = getenv("container");
346 /* Otherwise, PID 1 dropped this information into a
347 * file in /run. This is better than accessing
348 * /proc/1/environ, since we don't need CAP_SYS_PTRACE
351 r = read_one_line_file("/run/systemd/container", &m);
354 /* Fallback for cases where PID 1 was not
355 * systemd (for example, cases where
356 * init=/bin/sh is used. */
358 r = getenv_for_pid(1, "container", &m);
361 /* If that didn't work, give up,
362 * assume no container manager.
364 * Note: This means we still cannot
365 * detect containers if init=/bin/sh
366 * is passed but privileges dropped,
367 * as /proc/1/environ is only readable
368 * with privileges. */
380 /* We only recognize a selected few here, since we want to
381 * enforce a redacted namespace */
384 else if (streq(e, "lxc-libvirt"))
386 else if (streq(e, "systemd-nspawn"))
387 _id = "systemd-nspawn";
388 else if (streq(e, "docker"))
405 /// UNNEEDED by elogind
407 /* Returns a short identifier for the various VM/container implementations */
408 int detect_virtualization(const char **id) {
411 r = detect_container(id);
415 return VIRTUALIZATION_CONTAINER;
421 return VIRTUALIZATION_VM;
423 return VIRTUALIZATION_NONE;