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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 | ||
22 | #include <string.h> | |
23 | #include <errno.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "util.h" | |
0b452006 | 27 | #include "process-util.h" |
b52aae1d | 28 | #include "virt.h" |
a5c32cff | 29 | #include "fileio.h" |
b52aae1d | 30 | |
75f86906 | 31 | static int detect_vm_cpuid(void) { |
b52aae1d LP |
32 | |
33 | /* Both CPUID and DMI are x86 specific interfaces... */ | |
bdb628ee | 34 | #if defined(__i386__) || defined(__x86_64__) |
b52aae1d | 35 | |
75f86906 LP |
36 | static const struct { |
37 | const char *cpuid; | |
38 | int id; | |
39 | } cpuid_vendor_table[] = { | |
40 | { "XenVMMXenVMM", VIRTUALIZATION_XEN }, | |
41 | { "KVMKVMKVM", VIRTUALIZATION_KVM }, | |
b52aae1d | 42 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 | 43 | { "VMwareVMware", VIRTUALIZATION_VMWARE }, |
b52aae1d | 44 | /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */ |
75f86906 LP |
45 | { "Microsoft Hv", VIRTUALIZATION_MICROSOFT }, |
46 | }; | |
b52aae1d LP |
47 | |
48 | uint32_t eax, ecx; | |
b52aae1d LP |
49 | bool hypervisor; |
50 | ||
51 | /* http://lwn.net/Articles/301888/ */ | |
b52aae1d LP |
52 | |
53 | #if defined (__i386__) | |
54 | #define REG_a "eax" | |
55 | #define REG_b "ebx" | |
56 | #elif defined (__amd64__) | |
57 | #define REG_a "rax" | |
58 | #define REG_b "rbx" | |
59 | #endif | |
60 | ||
61 | /* First detect whether there is a hypervisor */ | |
62 | eax = 1; | |
63 | __asm__ __volatile__ ( | |
64 | /* ebx/rbx is being used for PIC! */ | |
65 | " push %%"REG_b" \n\t" | |
66 | " cpuid \n\t" | |
67 | " pop %%"REG_b" \n\t" | |
68 | ||
69 | : "=a" (eax), "=c" (ecx) | |
70 | : "0" (eax) | |
71 | ); | |
72 | ||
73 | hypervisor = !!(ecx & 0x80000000U); | |
74 | ||
75 | if (hypervisor) { | |
75f86906 LP |
76 | union { |
77 | uint32_t sig32[3]; | |
78 | char text[13]; | |
79 | } sig = {}; | |
80 | unsigned j; | |
b52aae1d LP |
81 | |
82 | /* There is a hypervisor, see what it is */ | |
83 | eax = 0x40000000U; | |
84 | __asm__ __volatile__ ( | |
85 | /* ebx/rbx is being used for PIC! */ | |
86 | " push %%"REG_b" \n\t" | |
87 | " cpuid \n\t" | |
88 | " mov %%ebx, %1 \n\t" | |
89 | " pop %%"REG_b" \n\t" | |
90 | ||
91 | : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2]) | |
92 | : "0" (eax) | |
93 | ); | |
94 | ||
75f86906 LP |
95 | for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++) |
96 | if (streq(sig.text, cpuid_vendor_table[j].cpuid)) | |
97 | return cpuid_vendor_table[j].id; | |
bdb628ee | 98 | |
75f86906 | 99 | return VIRTUALIZATION_VM_OTHER; |
b52aae1d | 100 | } |
bdb628ee ZJS |
101 | #endif |
102 | ||
75f86906 | 103 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
104 | } |
105 | ||
75f86906 | 106 | static int detect_vm_device_tree(void) { |
db6a8689 | 107 | #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__) |
d831deb5 CA |
108 | _cleanup_free_ char *hvtype = NULL; |
109 | int r; | |
110 | ||
b8f1df82 | 111 | r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype); |
75f86906 | 112 | if (r == -ENOENT) { |
ce09c71d AJ |
113 | _cleanup_closedir_ DIR *dir = NULL; |
114 | struct dirent *dent; | |
115 | ||
116 | dir = opendir("/proc/device-tree"); | |
117 | if (!dir) { | |
118 | if (errno == ENOENT) | |
75f86906 | 119 | return VIRTUALIZATION_NONE; |
ce09c71d AJ |
120 | return -errno; |
121 | } | |
122 | ||
75f86906 LP |
123 | FOREACH_DIRENT(dent, dir, return -errno) |
124 | if (strstr(dent->d_name, "fw-cfg")) | |
125 | return VIRTUALIZATION_QEMU; | |
126 | ||
127 | return VIRTUALIZATION_NONE; | |
128 | } else if (r < 0) | |
129 | return r; | |
130 | ||
131 | if (streq(hvtype, "linux,kvm")) | |
132 | return VIRTUALIZATION_KVM; | |
133 | else if (strstr(hvtype, "xen")) | |
134 | return VIRTUALIZATION_XEN; | |
135 | else | |
136 | return VIRTUALIZATION_VM_OTHER; | |
137 | #else | |
138 | return VIRTUALIZATION_NONE; | |
d831deb5 | 139 | #endif |
d831deb5 CA |
140 | } |
141 | ||
75f86906 | 142 | static int detect_vm_dmi(void) { |
bdb628ee ZJS |
143 | |
144 | /* Both CPUID and DMI are x86 specific interfaces... */ | |
145 | #if defined(__i386__) || defined(__x86_64__) | |
146 | ||
147 | static const char *const dmi_vendors[] = { | |
148 | "/sys/class/dmi/id/sys_vendor", | |
149 | "/sys/class/dmi/id/board_vendor", | |
150 | "/sys/class/dmi/id/bios_vendor" | |
151 | }; | |
152 | ||
75f86906 LP |
153 | static const struct { |
154 | const char *vendor; | |
155 | int id; | |
156 | } dmi_vendor_table[] = { | |
157 | { "QEMU", VIRTUALIZATION_QEMU }, | |
bdb628ee | 158 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 LP |
159 | { "VMware", VIRTUALIZATION_VMWARE }, |
160 | { "VMW", VIRTUALIZATION_VMWARE }, | |
161 | { "innotek GmbH", VIRTUALIZATION_ORACLE }, | |
162 | { "Xen", VIRTUALIZATION_XEN }, | |
163 | { "Bochs", VIRTUALIZATION_BOCHS }, | |
164 | { "Parallels", VIRTUALIZATION_PARALLELS }, | |
165 | }; | |
bdb628ee | 166 | unsigned i; |
75f86906 | 167 | int r; |
b52aae1d LP |
168 | |
169 | for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { | |
b1b8e816 | 170 | _cleanup_free_ char *s = NULL; |
75f86906 | 171 | unsigned j; |
b52aae1d | 172 | |
b1b8e816 LP |
173 | r = read_one_line_file(dmi_vendors[i], &s); |
174 | if (r < 0) { | |
75f86906 LP |
175 | if (r == -ENOENT) |
176 | continue; | |
b52aae1d | 177 | |
75f86906 | 178 | return r; |
b52aae1d LP |
179 | } |
180 | ||
75f86906 LP |
181 | for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++) |
182 | if (startswith(s, dmi_vendor_table[j].vendor)) | |
183 | return dmi_vendor_table[j].id; | |
b52aae1d | 184 | } |
bdb628ee ZJS |
185 | #endif |
186 | ||
75f86906 | 187 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
188 | } |
189 | ||
75f86906 LP |
190 | static int detect_vm_xen(void) { |
191 | _cleanup_free_ char *domcap = NULL; | |
192 | char *cap, *i; | |
bdb628ee | 193 | int r; |
b52aae1d | 194 | |
75f86906 LP |
195 | r = read_one_line_file("/proc/xen/capabilities", &domcap); |
196 | if (r == -ENOENT) | |
197 | return VIRTUALIZATION_NONE; | |
bdb628ee | 198 | |
75f86906 LP |
199 | i = domcap; |
200 | while ((cap = strsep(&i, ","))) | |
201 | if (streq(cap, "control_d")) | |
202 | break; | |
bdb628ee | 203 | |
75f86906 LP |
204 | return cap ? VIRTUALIZATION_NONE : VIRTUALIZATION_XEN; |
205 | } | |
37287585 | 206 | |
75f86906 LP |
207 | static int detect_vm_hypervisor(void) { |
208 | _cleanup_free_ char *hvtype = NULL; | |
209 | int r; | |
37287585 | 210 | |
75f86906 LP |
211 | r = read_one_line_file("/sys/hypervisor/type", &hvtype); |
212 | if (r == -ENOENT) | |
213 | return VIRTUALIZATION_NONE; | |
214 | if (r < 0) | |
215 | return r; | |
37287585 | 216 | |
75f86906 LP |
217 | if (streq(hvtype, "xen")) |
218 | return VIRTUALIZATION_XEN; | |
219 | else | |
220 | return VIRTUALIZATION_VM_OTHER; | |
221 | } | |
37287585 | 222 | |
75f86906 LP |
223 | static int detect_vm_uml(void) { |
224 | _cleanup_free_ char *cpuinfo_contents = NULL; | |
225 | int r; | |
37287585 | 226 | |
75f86906 LP |
227 | /* Detect User-Mode Linux by reading /proc/cpuinfo */ |
228 | r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL); | |
229 | if (r < 0) | |
bdb628ee | 230 | return r; |
75f86906 LP |
231 | if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) |
232 | return VIRTUALIZATION_UML; | |
bdb628ee | 233 | |
75f86906 LP |
234 | return VIRTUALIZATION_NONE; |
235 | } | |
e32886e0 | 236 | |
75f86906 | 237 | static int detect_vm_zvm(void) { |
bdb628ee | 238 | |
75f86906 LP |
239 | #if defined(__s390__) |
240 | _cleanup_free_ char *t = NULL; | |
241 | int r; | |
e32886e0 | 242 | |
c4cd1d4d | 243 | r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t); |
75f86906 LP |
244 | if (r == -ENOENT) |
245 | return VIRTUALIZATION_NONE; | |
246 | if (r < 0) | |
247 | return r; | |
e32886e0 | 248 | |
75f86906 LP |
249 | if (streq(t, "z/VM")) |
250 | return VIRTUALIZATION_ZVM; | |
251 | else | |
252 | return VIRTUALIZATION_KVM; | |
253 | #else | |
254 | return VIRTUALIZATION_NONE; | |
255 | #endif | |
256 | } | |
e32886e0 | 257 | |
75f86906 LP |
258 | /* Returns a short identifier for the various VM implementations */ |
259 | int detect_vm(void) { | |
260 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; | |
261 | int r; | |
e32886e0 | 262 | |
75f86906 LP |
263 | if (cached_found >= 0) |
264 | return cached_found; | |
bdb628ee | 265 | |
75f86906 LP |
266 | /* Try xen capabilities file first, if not found try |
267 | * high-level hypervisor sysfs file: | |
268 | * | |
269 | * https://bugs.freedesktop.org/show_bug.cgi?id=77271 */ | |
270 | ||
271 | r = detect_vm_xen(); | |
272 | if (r < 0) | |
273 | return r; | |
274 | if (r != VIRTUALIZATION_NONE) | |
d831deb5 CA |
275 | goto finish; |
276 | ||
75f86906 LP |
277 | r = detect_vm_dmi(); |
278 | if (r < 0) | |
279 | return r; | |
280 | if (r != VIRTUALIZATION_NONE) | |
0fb533a5 | 281 | goto finish; |
b52aae1d | 282 | |
75f86906 | 283 | r = detect_vm_cpuid(); |
7080ea16 RR |
284 | if (r < 0) |
285 | return r; | |
75f86906 | 286 | if (r != VIRTUALIZATION_NONE) |
0fb533a5 | 287 | goto finish; |
7080ea16 | 288 | |
75f86906 LP |
289 | r = detect_vm_hypervisor(); |
290 | if (r < 0) | |
291 | return r; | |
292 | if (r != VIRTUALIZATION_NONE) | |
293 | goto finish; | |
f41925b4 | 294 | |
75f86906 LP |
295 | r = detect_vm_device_tree(); |
296 | if (r < 0) | |
297 | return r; | |
298 | if (r != VIRTUALIZATION_NONE) | |
299 | goto finish; | |
f41925b4 | 300 | |
75f86906 LP |
301 | r = detect_vm_uml(); |
302 | if (r < 0) | |
303 | return r; | |
304 | if (r != VIRTUALIZATION_NONE) | |
305 | goto finish; | |
f41925b4 | 306 | |
75f86906 LP |
307 | r = detect_vm_zvm(); |
308 | if (r < 0) | |
309 | return r; | |
0fb533a5 LP |
310 | |
311 | finish: | |
312 | cached_found = r; | |
0fb533a5 | 313 | return r; |
b52aae1d LP |
314 | } |
315 | ||
75f86906 | 316 | int detect_container(void) { |
0fb533a5 | 317 | |
75f86906 LP |
318 | static const struct { |
319 | const char *value; | |
320 | int id; | |
321 | } value_table[] = { | |
322 | { "lxc", VIRTUALIZATION_LXC }, | |
323 | { "lxc-libvirt", VIRTUALIZATION_LXC_LIBVIRT }, | |
324 | { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN }, | |
325 | { "docker", VIRTUALIZATION_DOCKER }, | |
326 | }; | |
0fb533a5 | 327 | |
75f86906 | 328 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; |
fdd25311 | 329 | _cleanup_free_ char *m = NULL; |
75f86906 LP |
330 | const char *e = NULL; |
331 | unsigned j; | |
ab94af92 | 332 | int r; |
b52aae1d | 333 | |
75f86906 | 334 | if (cached_found >= 0) |
0fb533a5 | 335 | return cached_found; |
0fb533a5 | 336 | |
b52aae1d LP |
337 | /* /proc/vz exists in container and outside of the container, |
338 | * /proc/bc only outside of the container. */ | |
339 | if (access("/proc/vz", F_OK) >= 0 && | |
340 | access("/proc/bc", F_OK) < 0) { | |
75f86906 | 341 | r = VIRTUALIZATION_OPENVZ; |
0fb533a5 | 342 | goto finish; |
b52aae1d LP |
343 | } |
344 | ||
fdd25311 LP |
345 | if (getpid() == 1) { |
346 | /* If we are PID 1 we can just check our own | |
347 | * environment variable */ | |
348 | ||
349 | e = getenv("container"); | |
350 | if (isempty(e)) { | |
75f86906 | 351 | r = VIRTUALIZATION_NONE; |
fdd25311 LP |
352 | goto finish; |
353 | } | |
354 | } else { | |
355 | ||
356 | /* Otherwise, PID 1 dropped this information into a | |
357 | * file in /run. This is better than accessing | |
358 | * /proc/1/environ, since we don't need CAP_SYS_PTRACE | |
359 | * for that. */ | |
360 | ||
361 | r = read_one_line_file("/run/systemd/container", &m); | |
362 | if (r == -ENOENT) { | |
536bfdab LP |
363 | |
364 | /* Fallback for cases where PID 1 was not | |
365 | * systemd (for example, cases where | |
366 | * init=/bin/sh is used. */ | |
367 | ||
368 | r = getenv_for_pid(1, "container", &m); | |
369 | if (r <= 0) { | |
370 | ||
371 | /* If that didn't work, give up, | |
372 | * assume no container manager. | |
373 | * | |
374 | * Note: This means we still cannot | |
375 | * detect containers if init=/bin/sh | |
376 | * is passed but privileges dropped, | |
377 | * as /proc/1/environ is only readable | |
378 | * with privileges. */ | |
379 | ||
75f86906 | 380 | r = VIRTUALIZATION_NONE; |
536bfdab LP |
381 | goto finish; |
382 | } | |
fdd25311 LP |
383 | } |
384 | if (r < 0) | |
385 | return r; | |
386 | ||
387 | e = m; | |
388 | } | |
b52aae1d | 389 | |
75f86906 LP |
390 | for (j = 0; j < ELEMENTSOF(value_table); j++) |
391 | if (streq(e, value_table[j].value)) { | |
392 | r = value_table[j].id; | |
393 | goto finish; | |
394 | } | |
0fb533a5 | 395 | |
75f86906 | 396 | r = VIRTUALIZATION_NONE; |
fdd25311 | 397 | |
0fb533a5 LP |
398 | finish: |
399 | cached_found = r; | |
ab94af92 | 400 | return r; |
b52aae1d LP |
401 | } |
402 | ||
75f86906 | 403 | int detect_virtualization(void) { |
b52aae1d | 404 | int r; |
b52aae1d | 405 | |
75f86906 LP |
406 | r = detect_container(); |
407 | if (r != 0) | |
0fb533a5 | 408 | return r; |
b52aae1d | 409 | |
75f86906 | 410 | return detect_vm(); |
b52aae1d | 411 | } |
75f86906 LP |
412 | |
413 | static const char *const virtualization_table[_VIRTUALIZATION_MAX] = { | |
414 | [VIRTUALIZATION_NONE] = "none", | |
415 | [VIRTUALIZATION_KVM] = "kvm", | |
416 | [VIRTUALIZATION_QEMU] = "qemu", | |
417 | [VIRTUALIZATION_BOCHS] = "bochs", | |
418 | [VIRTUALIZATION_XEN] = "xen", | |
419 | [VIRTUALIZATION_UML] = "uml", | |
420 | [VIRTUALIZATION_VMWARE] = "vmware", | |
421 | [VIRTUALIZATION_ORACLE] = "oracle", | |
422 | [VIRTUALIZATION_MICROSOFT] = "microsoft", | |
423 | [VIRTUALIZATION_ZVM] = "zvm", | |
424 | [VIRTUALIZATION_PARALLELS] = "parallels", | |
425 | [VIRTUALIZATION_VM_OTHER] = "vm-other", | |
426 | ||
427 | [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", | |
428 | [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", | |
429 | [VIRTUALIZATION_LXC] = "lxc", | |
430 | [VIRTUALIZATION_OPENVZ] = "openvz", | |
431 | [VIRTUALIZATION_DOCKER] = "docker", | |
432 | [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", | |
433 | }; | |
434 | ||
435 | DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |