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b52aae1d LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
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 | |
b52aae1d LP |
11 | (at your option) any later version. |
12 | ||
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
b52aae1d | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
b52aae1d LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
b52aae1d | 22 | #include <errno.h> |
07630cea | 23 | #include <string.h> |
b52aae1d LP |
24 | #include <unistd.h> |
25 | ||
07630cea | 26 | #include "fileio.h" |
0b452006 | 27 | #include "process-util.h" |
8b43440b | 28 | #include "string-table.h" |
07630cea LP |
29 | #include "string-util.h" |
30 | #include "util.h" | |
b52aae1d LP |
31 | #include "virt.h" |
32 | ||
75f86906 | 33 | static int detect_vm_cpuid(void) { |
b52aae1d LP |
34 | |
35 | /* Both CPUID and DMI are x86 specific interfaces... */ | |
bdb628ee | 36 | #if defined(__i386__) || defined(__x86_64__) |
b52aae1d | 37 | |
75f86906 LP |
38 | static const struct { |
39 | const char *cpuid; | |
40 | int id; | |
41 | } cpuid_vendor_table[] = { | |
42 | { "XenVMMXenVMM", VIRTUALIZATION_XEN }, | |
43 | { "KVMKVMKVM", VIRTUALIZATION_KVM }, | |
b52aae1d | 44 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 | 45 | { "VMwareVMware", VIRTUALIZATION_VMWARE }, |
b52aae1d | 46 | /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */ |
75f86906 LP |
47 | { "Microsoft Hv", VIRTUALIZATION_MICROSOFT }, |
48 | }; | |
b52aae1d LP |
49 | |
50 | uint32_t eax, ecx; | |
b52aae1d LP |
51 | bool hypervisor; |
52 | ||
53 | /* http://lwn.net/Articles/301888/ */ | |
b52aae1d LP |
54 | |
55 | #if defined (__i386__) | |
56 | #define REG_a "eax" | |
57 | #define REG_b "ebx" | |
58 | #elif defined (__amd64__) | |
59 | #define REG_a "rax" | |
60 | #define REG_b "rbx" | |
61 | #endif | |
62 | ||
63 | /* First detect whether there is a hypervisor */ | |
64 | eax = 1; | |
65 | __asm__ __volatile__ ( | |
66 | /* ebx/rbx is being used for PIC! */ | |
67 | " push %%"REG_b" \n\t" | |
68 | " cpuid \n\t" | |
69 | " pop %%"REG_b" \n\t" | |
70 | ||
71 | : "=a" (eax), "=c" (ecx) | |
72 | : "0" (eax) | |
73 | ); | |
74 | ||
75 | hypervisor = !!(ecx & 0x80000000U); | |
76 | ||
77 | if (hypervisor) { | |
75f86906 LP |
78 | union { |
79 | uint32_t sig32[3]; | |
80 | char text[13]; | |
81 | } sig = {}; | |
82 | unsigned j; | |
b52aae1d LP |
83 | |
84 | /* There is a hypervisor, see what it is */ | |
85 | eax = 0x40000000U; | |
86 | __asm__ __volatile__ ( | |
87 | /* ebx/rbx is being used for PIC! */ | |
88 | " push %%"REG_b" \n\t" | |
89 | " cpuid \n\t" | |
90 | " mov %%ebx, %1 \n\t" | |
91 | " pop %%"REG_b" \n\t" | |
92 | ||
93 | : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2]) | |
94 | : "0" (eax) | |
95 | ); | |
96 | ||
75f86906 LP |
97 | for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++) |
98 | if (streq(sig.text, cpuid_vendor_table[j].cpuid)) | |
99 | return cpuid_vendor_table[j].id; | |
bdb628ee | 100 | |
75f86906 | 101 | return VIRTUALIZATION_VM_OTHER; |
b52aae1d | 102 | } |
bdb628ee ZJS |
103 | #endif |
104 | ||
75f86906 | 105 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
106 | } |
107 | ||
75f86906 | 108 | static int detect_vm_device_tree(void) { |
db6a8689 | 109 | #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__) |
d831deb5 CA |
110 | _cleanup_free_ char *hvtype = NULL; |
111 | int r; | |
112 | ||
b8f1df82 | 113 | r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype); |
75f86906 | 114 | if (r == -ENOENT) { |
ce09c71d AJ |
115 | _cleanup_closedir_ DIR *dir = NULL; |
116 | struct dirent *dent; | |
117 | ||
118 | dir = opendir("/proc/device-tree"); | |
119 | if (!dir) { | |
120 | if (errno == ENOENT) | |
75f86906 | 121 | return VIRTUALIZATION_NONE; |
ce09c71d AJ |
122 | return -errno; |
123 | } | |
124 | ||
75f86906 LP |
125 | FOREACH_DIRENT(dent, dir, return -errno) |
126 | if (strstr(dent->d_name, "fw-cfg")) | |
127 | return VIRTUALIZATION_QEMU; | |
128 | ||
129 | return VIRTUALIZATION_NONE; | |
130 | } else if (r < 0) | |
131 | return r; | |
132 | ||
133 | if (streq(hvtype, "linux,kvm")) | |
134 | return VIRTUALIZATION_KVM; | |
135 | else if (strstr(hvtype, "xen")) | |
136 | return VIRTUALIZATION_XEN; | |
137 | else | |
138 | return VIRTUALIZATION_VM_OTHER; | |
139 | #else | |
140 | return VIRTUALIZATION_NONE; | |
d831deb5 | 141 | #endif |
d831deb5 CA |
142 | } |
143 | ||
75f86906 | 144 | static int detect_vm_dmi(void) { |
bdb628ee ZJS |
145 | |
146 | /* Both CPUID and DMI are x86 specific interfaces... */ | |
147 | #if defined(__i386__) || defined(__x86_64__) | |
148 | ||
149 | static const char *const dmi_vendors[] = { | |
150 | "/sys/class/dmi/id/sys_vendor", | |
151 | "/sys/class/dmi/id/board_vendor", | |
152 | "/sys/class/dmi/id/bios_vendor" | |
153 | }; | |
154 | ||
75f86906 LP |
155 | static const struct { |
156 | const char *vendor; | |
157 | int id; | |
158 | } dmi_vendor_table[] = { | |
159 | { "QEMU", VIRTUALIZATION_QEMU }, | |
bdb628ee | 160 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 LP |
161 | { "VMware", VIRTUALIZATION_VMWARE }, |
162 | { "VMW", VIRTUALIZATION_VMWARE }, | |
163 | { "innotek GmbH", VIRTUALIZATION_ORACLE }, | |
164 | { "Xen", VIRTUALIZATION_XEN }, | |
165 | { "Bochs", VIRTUALIZATION_BOCHS }, | |
166 | { "Parallels", VIRTUALIZATION_PARALLELS }, | |
167 | }; | |
bdb628ee | 168 | unsigned i; |
75f86906 | 169 | int r; |
b52aae1d LP |
170 | |
171 | for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { | |
b1b8e816 | 172 | _cleanup_free_ char *s = NULL; |
75f86906 | 173 | unsigned j; |
b52aae1d | 174 | |
b1b8e816 LP |
175 | r = read_one_line_file(dmi_vendors[i], &s); |
176 | if (r < 0) { | |
75f86906 LP |
177 | if (r == -ENOENT) |
178 | continue; | |
b52aae1d | 179 | |
75f86906 | 180 | return r; |
b52aae1d LP |
181 | } |
182 | ||
75f86906 LP |
183 | for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++) |
184 | if (startswith(s, dmi_vendor_table[j].vendor)) | |
185 | return dmi_vendor_table[j].id; | |
b52aae1d | 186 | } |
bdb628ee ZJS |
187 | #endif |
188 | ||
75f86906 | 189 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
190 | } |
191 | ||
75f86906 LP |
192 | static int detect_vm_xen(void) { |
193 | _cleanup_free_ char *domcap = NULL; | |
194 | char *cap, *i; | |
bdb628ee | 195 | int r; |
b52aae1d | 196 | |
75f86906 LP |
197 | r = read_one_line_file("/proc/xen/capabilities", &domcap); |
198 | if (r == -ENOENT) | |
199 | return VIRTUALIZATION_NONE; | |
bdb628ee | 200 | |
75f86906 LP |
201 | i = domcap; |
202 | while ((cap = strsep(&i, ","))) | |
203 | if (streq(cap, "control_d")) | |
204 | break; | |
bdb628ee | 205 | |
75f86906 LP |
206 | return cap ? VIRTUALIZATION_NONE : VIRTUALIZATION_XEN; |
207 | } | |
37287585 | 208 | |
75f86906 LP |
209 | static int detect_vm_hypervisor(void) { |
210 | _cleanup_free_ char *hvtype = NULL; | |
211 | int r; | |
37287585 | 212 | |
75f86906 LP |
213 | r = read_one_line_file("/sys/hypervisor/type", &hvtype); |
214 | if (r == -ENOENT) | |
215 | return VIRTUALIZATION_NONE; | |
216 | if (r < 0) | |
217 | return r; | |
37287585 | 218 | |
75f86906 LP |
219 | if (streq(hvtype, "xen")) |
220 | return VIRTUALIZATION_XEN; | |
221 | else | |
222 | return VIRTUALIZATION_VM_OTHER; | |
223 | } | |
37287585 | 224 | |
75f86906 LP |
225 | static int detect_vm_uml(void) { |
226 | _cleanup_free_ char *cpuinfo_contents = NULL; | |
227 | int r; | |
37287585 | 228 | |
75f86906 LP |
229 | /* Detect User-Mode Linux by reading /proc/cpuinfo */ |
230 | r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL); | |
231 | if (r < 0) | |
bdb628ee | 232 | return r; |
75f86906 LP |
233 | if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) |
234 | return VIRTUALIZATION_UML; | |
bdb628ee | 235 | |
75f86906 LP |
236 | return VIRTUALIZATION_NONE; |
237 | } | |
e32886e0 | 238 | |
75f86906 | 239 | static int detect_vm_zvm(void) { |
bdb628ee | 240 | |
75f86906 LP |
241 | #if defined(__s390__) |
242 | _cleanup_free_ char *t = NULL; | |
243 | int r; | |
e32886e0 | 244 | |
c4cd1d4d | 245 | r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t); |
75f86906 LP |
246 | if (r == -ENOENT) |
247 | return VIRTUALIZATION_NONE; | |
248 | if (r < 0) | |
249 | return r; | |
e32886e0 | 250 | |
75f86906 LP |
251 | if (streq(t, "z/VM")) |
252 | return VIRTUALIZATION_ZVM; | |
253 | else | |
254 | return VIRTUALIZATION_KVM; | |
255 | #else | |
256 | return VIRTUALIZATION_NONE; | |
257 | #endif | |
258 | } | |
e32886e0 | 259 | |
75f86906 LP |
260 | /* Returns a short identifier for the various VM implementations */ |
261 | int detect_vm(void) { | |
262 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; | |
263 | int r; | |
e32886e0 | 264 | |
75f86906 LP |
265 | if (cached_found >= 0) |
266 | return cached_found; | |
bdb628ee | 267 | |
75f86906 LP |
268 | /* Try xen capabilities file first, if not found try |
269 | * high-level hypervisor sysfs file: | |
270 | * | |
271 | * https://bugs.freedesktop.org/show_bug.cgi?id=77271 */ | |
272 | ||
273 | r = detect_vm_xen(); | |
274 | if (r < 0) | |
275 | return r; | |
276 | if (r != VIRTUALIZATION_NONE) | |
d831deb5 CA |
277 | goto finish; |
278 | ||
75f86906 LP |
279 | r = detect_vm_dmi(); |
280 | if (r < 0) | |
281 | return r; | |
282 | if (r != VIRTUALIZATION_NONE) | |
0fb533a5 | 283 | goto finish; |
b52aae1d | 284 | |
75f86906 | 285 | r = detect_vm_cpuid(); |
7080ea16 RR |
286 | if (r < 0) |
287 | return r; | |
75f86906 | 288 | if (r != VIRTUALIZATION_NONE) |
0fb533a5 | 289 | goto finish; |
7080ea16 | 290 | |
75f86906 LP |
291 | r = detect_vm_hypervisor(); |
292 | if (r < 0) | |
293 | return r; | |
294 | if (r != VIRTUALIZATION_NONE) | |
295 | goto finish; | |
f41925b4 | 296 | |
75f86906 LP |
297 | r = detect_vm_device_tree(); |
298 | if (r < 0) | |
299 | return r; | |
300 | if (r != VIRTUALIZATION_NONE) | |
301 | goto finish; | |
f41925b4 | 302 | |
75f86906 LP |
303 | r = detect_vm_uml(); |
304 | if (r < 0) | |
305 | return r; | |
306 | if (r != VIRTUALIZATION_NONE) | |
307 | goto finish; | |
f41925b4 | 308 | |
75f86906 LP |
309 | r = detect_vm_zvm(); |
310 | if (r < 0) | |
311 | return r; | |
0fb533a5 LP |
312 | |
313 | finish: | |
314 | cached_found = r; | |
0fb533a5 | 315 | return r; |
b52aae1d LP |
316 | } |
317 | ||
75f86906 | 318 | int detect_container(void) { |
0fb533a5 | 319 | |
75f86906 LP |
320 | static const struct { |
321 | const char *value; | |
322 | int id; | |
323 | } value_table[] = { | |
324 | { "lxc", VIRTUALIZATION_LXC }, | |
325 | { "lxc-libvirt", VIRTUALIZATION_LXC_LIBVIRT }, | |
326 | { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN }, | |
327 | { "docker", VIRTUALIZATION_DOCKER }, | |
328 | }; | |
0fb533a5 | 329 | |
75f86906 | 330 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; |
fdd25311 | 331 | _cleanup_free_ char *m = NULL; |
75f86906 LP |
332 | const char *e = NULL; |
333 | unsigned j; | |
ab94af92 | 334 | int r; |
b52aae1d | 335 | |
75f86906 | 336 | if (cached_found >= 0) |
0fb533a5 | 337 | return cached_found; |
0fb533a5 | 338 | |
b52aae1d LP |
339 | /* /proc/vz exists in container and outside of the container, |
340 | * /proc/bc only outside of the container. */ | |
341 | if (access("/proc/vz", F_OK) >= 0 && | |
342 | access("/proc/bc", F_OK) < 0) { | |
75f86906 | 343 | r = VIRTUALIZATION_OPENVZ; |
0fb533a5 | 344 | goto finish; |
b52aae1d LP |
345 | } |
346 | ||
fdd25311 LP |
347 | if (getpid() == 1) { |
348 | /* If we are PID 1 we can just check our own | |
349 | * environment variable */ | |
350 | ||
351 | e = getenv("container"); | |
352 | if (isempty(e)) { | |
75f86906 | 353 | r = VIRTUALIZATION_NONE; |
fdd25311 LP |
354 | goto finish; |
355 | } | |
356 | } else { | |
357 | ||
358 | /* Otherwise, PID 1 dropped this information into a | |
359 | * file in /run. This is better than accessing | |
360 | * /proc/1/environ, since we don't need CAP_SYS_PTRACE | |
361 | * for that. */ | |
362 | ||
363 | r = read_one_line_file("/run/systemd/container", &m); | |
364 | if (r == -ENOENT) { | |
536bfdab LP |
365 | |
366 | /* Fallback for cases where PID 1 was not | |
367 | * systemd (for example, cases where | |
368 | * init=/bin/sh is used. */ | |
369 | ||
370 | r = getenv_for_pid(1, "container", &m); | |
371 | if (r <= 0) { | |
372 | ||
373 | /* If that didn't work, give up, | |
374 | * assume no container manager. | |
375 | * | |
376 | * Note: This means we still cannot | |
377 | * detect containers if init=/bin/sh | |
378 | * is passed but privileges dropped, | |
379 | * as /proc/1/environ is only readable | |
380 | * with privileges. */ | |
381 | ||
75f86906 | 382 | r = VIRTUALIZATION_NONE; |
536bfdab LP |
383 | goto finish; |
384 | } | |
fdd25311 LP |
385 | } |
386 | if (r < 0) | |
387 | return r; | |
388 | ||
389 | e = m; | |
390 | } | |
b52aae1d | 391 | |
75f86906 LP |
392 | for (j = 0; j < ELEMENTSOF(value_table); j++) |
393 | if (streq(e, value_table[j].value)) { | |
394 | r = value_table[j].id; | |
395 | goto finish; | |
396 | } | |
0fb533a5 | 397 | |
75f86906 | 398 | r = VIRTUALIZATION_NONE; |
fdd25311 | 399 | |
0fb533a5 LP |
400 | finish: |
401 | cached_found = r; | |
ab94af92 | 402 | return r; |
b52aae1d LP |
403 | } |
404 | ||
75f86906 | 405 | int detect_virtualization(void) { |
b52aae1d | 406 | int r; |
b52aae1d | 407 | |
75f86906 LP |
408 | r = detect_container(); |
409 | if (r != 0) | |
0fb533a5 | 410 | return r; |
b52aae1d | 411 | |
75f86906 | 412 | return detect_vm(); |
b52aae1d | 413 | } |
75f86906 LP |
414 | |
415 | static const char *const virtualization_table[_VIRTUALIZATION_MAX] = { | |
416 | [VIRTUALIZATION_NONE] = "none", | |
417 | [VIRTUALIZATION_KVM] = "kvm", | |
418 | [VIRTUALIZATION_QEMU] = "qemu", | |
419 | [VIRTUALIZATION_BOCHS] = "bochs", | |
420 | [VIRTUALIZATION_XEN] = "xen", | |
421 | [VIRTUALIZATION_UML] = "uml", | |
422 | [VIRTUALIZATION_VMWARE] = "vmware", | |
423 | [VIRTUALIZATION_ORACLE] = "oracle", | |
424 | [VIRTUALIZATION_MICROSOFT] = "microsoft", | |
425 | [VIRTUALIZATION_ZVM] = "zvm", | |
426 | [VIRTUALIZATION_PARALLELS] = "parallels", | |
427 | [VIRTUALIZATION_VM_OTHER] = "vm-other", | |
428 | ||
429 | [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", | |
430 | [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", | |
431 | [VIRTUALIZATION_LXC] = "lxc", | |
432 | [VIRTUALIZATION_OPENVZ] = "openvz", | |
433 | [VIRTUALIZATION_DOCKER] = "docker", | |
434 | [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", | |
435 | }; | |
436 | ||
437 | DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |