2 This file is part of systemd.
4 Copyright 2011 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include "alloc-util.h"
27 #include "dirent-util.h"
31 #include "process-util.h"
32 #include "stat-util.h"
33 #include "string-table.h"
34 #include "string-util.h"
37 #if 0 /// UNNEEDED by elogind
38 static int detect_vm_cpuid(void) {
40 /* CPUID is an x86 specific interface. */
41 #if defined(__i386__) || defined(__x86_64__)
46 } cpuid_vendor_table[] = {
47 { "XenVMMXenVMM", VIRTUALIZATION_XEN },
48 { "KVMKVMKVM", VIRTUALIZATION_KVM },
49 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
50 { "VMwareVMware", VIRTUALIZATION_VMWARE },
51 /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
52 { "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
58 /* http://lwn.net/Articles/301888/ */
60 #if defined (__i386__)
63 #elif defined (__amd64__)
68 /* First detect whether there is a hypervisor */
70 __asm__ __volatile__ (
71 /* ebx/rbx is being used for PIC! */
72 " push %%"REG_b" \n\t"
76 : "=a" (eax), "=c" (ecx)
80 hypervisor = !!(ecx & 0x80000000U);
89 /* There is a hypervisor, see what it is */
91 __asm__ __volatile__ (
92 /* ebx/rbx is being used for PIC! */
93 " push %%"REG_b" \n\t"
98 : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
102 for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++)
103 if (streq(sig.text, cpuid_vendor_table[j].cpuid))
104 return cpuid_vendor_table[j].id;
106 return VIRTUALIZATION_VM_OTHER;
110 return VIRTUALIZATION_NONE;
113 static int detect_vm_device_tree(void) {
114 #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__)
115 _cleanup_free_ char *hvtype = NULL;
118 r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype);
120 _cleanup_closedir_ DIR *dir = NULL;
123 dir = opendir("/proc/device-tree");
126 return VIRTUALIZATION_NONE;
130 FOREACH_DIRENT(dent, dir, return -errno)
131 if (strstr(dent->d_name, "fw-cfg"))
132 return VIRTUALIZATION_QEMU;
134 return VIRTUALIZATION_NONE;
138 if (streq(hvtype, "linux,kvm"))
139 return VIRTUALIZATION_KVM;
140 else if (strstr(hvtype, "xen"))
141 return VIRTUALIZATION_XEN;
143 return VIRTUALIZATION_VM_OTHER;
145 return VIRTUALIZATION_NONE;
149 static int detect_vm_dmi(void) {
150 #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
152 static const char *const dmi_vendors[] = {
153 "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */
154 "/sys/class/dmi/id/sys_vendor",
155 "/sys/class/dmi/id/board_vendor",
156 "/sys/class/dmi/id/bios_vendor"
159 static const struct {
162 } dmi_vendor_table[] = {
163 { "KVM", VIRTUALIZATION_KVM },
164 { "QEMU", VIRTUALIZATION_QEMU },
165 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
166 { "VMware", VIRTUALIZATION_VMWARE },
167 { "VMW", VIRTUALIZATION_VMWARE },
168 { "innotek GmbH", VIRTUALIZATION_ORACLE },
169 { "Xen", VIRTUALIZATION_XEN },
170 { "Bochs", VIRTUALIZATION_BOCHS },
171 { "Parallels", VIRTUALIZATION_PARALLELS },
176 for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
177 _cleanup_free_ char *s = NULL;
180 r = read_one_line_file(dmi_vendors[i], &s);
188 for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++)
189 if (startswith(s, dmi_vendor_table[j].vendor))
190 return dmi_vendor_table[j].id;
194 return VIRTUALIZATION_NONE;
197 static int detect_vm_xen(void) {
198 _cleanup_free_ char *domcap = NULL;
202 r = read_one_line_file("/proc/xen/capabilities", &domcap);
204 return VIRTUALIZATION_NONE;
207 while ((cap = strsep(&i, ",")))
208 if (streq(cap, "control_d"))
211 return cap ? VIRTUALIZATION_NONE : VIRTUALIZATION_XEN;
214 static int detect_vm_hypervisor(void) {
215 _cleanup_free_ char *hvtype = NULL;
218 r = read_one_line_file("/sys/hypervisor/type", &hvtype);
220 return VIRTUALIZATION_NONE;
224 if (streq(hvtype, "xen"))
225 return VIRTUALIZATION_XEN;
227 return VIRTUALIZATION_VM_OTHER;
230 static int detect_vm_uml(void) {
231 _cleanup_free_ char *cpuinfo_contents = NULL;
234 /* Detect User-Mode Linux by reading /proc/cpuinfo */
235 r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
238 if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n"))
239 return VIRTUALIZATION_UML;
241 return VIRTUALIZATION_NONE;
244 static int detect_vm_zvm(void) {
246 #if defined(__s390__)
247 _cleanup_free_ char *t = NULL;
250 r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t);
252 return VIRTUALIZATION_NONE;
256 if (streq(t, "z/VM"))
257 return VIRTUALIZATION_ZVM;
259 return VIRTUALIZATION_KVM;
261 return VIRTUALIZATION_NONE;
265 /* Returns a short identifier for the various VM implementations */
266 int detect_vm(void) {
267 static thread_local int cached_found = _VIRTUALIZATION_INVALID;
270 if (cached_found >= 0)
273 /* We have to use the correct order here:
274 * Some virtualization technologies do use KVM hypervisor but are
275 * expected to be detected as something else. So detect DMI first.
277 * An example is Virtualbox since version 5.0, which uses KVM backend.
278 * Detection via DMI works corretly, the CPU ID would find KVM
283 if (r != VIRTUALIZATION_NONE)
286 r = detect_vm_cpuid();
289 if (r != VIRTUALIZATION_NONE)
292 /* x86 xen will most likely be detected by cpuid. If not (most likely
293 * because we're not an x86 guest), then we should try the xen capabilities
294 * file next. If that's not found, then we check for the high-level
295 * hypervisor sysfs file:
297 * https://bugs.freedesktop.org/show_bug.cgi?id=77271 */
302 if (r != VIRTUALIZATION_NONE)
305 r = detect_vm_hypervisor();
308 if (r != VIRTUALIZATION_NONE)
311 r = detect_vm_device_tree();
314 if (r != VIRTUALIZATION_NONE)
320 if (r != VIRTUALIZATION_NONE)
333 int detect_container(void) {
335 static const struct {
339 { "lxc", VIRTUALIZATION_LXC },
340 { "lxc-libvirt", VIRTUALIZATION_LXC_LIBVIRT },
341 { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN },
342 { "docker", VIRTUALIZATION_DOCKER },
343 { "rkt", VIRTUALIZATION_RKT },
346 static thread_local int cached_found = _VIRTUALIZATION_INVALID;
347 _cleanup_free_ char *m = NULL;
348 const char *e = NULL;
352 if (cached_found >= 0)
355 /* /proc/vz exists in container and outside of the container,
356 * /proc/bc only outside of the container. */
357 if (access("/proc/vz", F_OK) >= 0 &&
358 access("/proc/bc", F_OK) < 0) {
359 r = VIRTUALIZATION_OPENVZ;
364 /* If we are PID 1 we can just check our own
365 * environment variable */
367 e = getenv("container");
369 r = VIRTUALIZATION_NONE;
374 /* Otherwise, PID 1 dropped this information into a
375 * file in /run. This is better than accessing
376 * /proc/1/environ, since we don't need CAP_SYS_PTRACE
379 r = read_one_line_file("/run/systemd/container", &m);
382 /* Fallback for cases where PID 1 was not
383 * systemd (for example, cases where
384 * init=/bin/sh is used. */
386 r = getenv_for_pid(1, "container", &m);
389 /* If that didn't work, give up,
390 * assume no container manager.
392 * Note: This means we still cannot
393 * detect containers if init=/bin/sh
394 * is passed but privileges dropped,
395 * as /proc/1/environ is only readable
396 * with privileges. */
398 r = VIRTUALIZATION_NONE;
408 for (j = 0; j < ELEMENTSOF(value_table); j++)
409 if (streq(e, value_table[j].value)) {
410 r = value_table[j].id;
414 r = VIRTUALIZATION_CONTAINER_OTHER;
421 #if 0 /// UNNEEDED by elogind
422 int detect_virtualization(void) {
425 r = detect_container();
433 int running_in_chroot(void) {
436 ret = files_same("/proc/1/root", "/");
443 #if 0 /// UNNEEDED by elogind
444 static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
445 [VIRTUALIZATION_NONE] = "none",
446 [VIRTUALIZATION_KVM] = "kvm",
447 [VIRTUALIZATION_QEMU] = "qemu",
448 [VIRTUALIZATION_BOCHS] = "bochs",
449 [VIRTUALIZATION_XEN] = "xen",
450 [VIRTUALIZATION_UML] = "uml",
451 [VIRTUALIZATION_VMWARE] = "vmware",
452 [VIRTUALIZATION_ORACLE] = "oracle",
453 [VIRTUALIZATION_MICROSOFT] = "microsoft",
454 [VIRTUALIZATION_ZVM] = "zvm",
455 [VIRTUALIZATION_PARALLELS] = "parallels",
456 [VIRTUALIZATION_VM_OTHER] = "vm-other",
458 [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn",
459 [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt",
460 [VIRTUALIZATION_LXC] = "lxc",
461 [VIRTUALIZATION_OPENVZ] = "openvz",
462 [VIRTUALIZATION_DOCKER] = "docker",
463 [VIRTUALIZATION_RKT] = "rkt",
464 [VIRTUALIZATION_CONTAINER_OTHER] = "container-other",
467 DEFINE_STRING_TABLE_LOOKUP(virtualization, int);