src/basic/virt.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2011 Lennart Poettering
   6 ***/
   7
   8 #if defined(__i386__) || defined(__x86_64__)
   9 //#include <cpuid.h>
  10 #endif
  11 #include <errno.h>
  12 #include <stdint.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16
  17 #include "alloc-util.h"
  18 #include "dirent-util.h"
  19 #include "env-util.h"
  20 #include "fd-util.h"
  21 #include "fileio.h"
  22 #include "macro.h"
  23 #include "process-util.h"
  24 #include "stat-util.h"
  25 #include "string-table.h"
  26 #include "string-util.h"
  27 #include "virt.h"
  28
  29 #if 0 /// UNNEEDED by elogind
  30 static int detect_vm_cpuid(void) {
  31
  32         /* CPUID is an x86 specific interface. */
  33 #if defined(__i386__) || defined(__x86_64__)
  34
  35         static const struct {
  36                 const char *cpuid;
  37                 int id;
  38         } cpuid_vendor_table[] = {
  39                 { "XenVMMXenVMM", VIRTUALIZATION_XEN       },
  40                 { "KVMKVMKVM",    VIRTUALIZATION_KVM       },
  41                 { "TCGTCGTCGTCG", VIRTUALIZATION_QEMU      },
  42                 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
  43                 { "VMwareVMware", VIRTUALIZATION_VMWARE    },
  44                 /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */
  45                 { "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
  46                 /* https://wiki.freebsd.org/bhyve */
  47                 { "bhyve bhyve ", VIRTUALIZATION_BHYVE     },
  48                 { "QNXQVMBSQG",   VIRTUALIZATION_QNX       },
  49         };
  50
  51         uint32_t eax, ebx, ecx, edx;
  52         bool hypervisor;
  53
  54         /* http://lwn.net/Articles/301888/ */
  55
  56         /* First detect whether there is a hypervisor */
  57         if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0)
  58                 return VIRTUALIZATION_NONE;
  59
  60         hypervisor = !!(ecx & 0x80000000U);
  61
  62         if (hypervisor) {
  63                 union {
  64                         uint32_t sig32[3];
  65                         char text[13];
  66                 } sig = {};
  67                 unsigned j;
  68
  69                 /* There is a hypervisor, see what it is */
  70                 __cpuid(0x40000000U, eax, ebx, ecx, edx);
  71
  72                 sig.sig32[0] = ebx;
  73                 sig.sig32[1] = ecx;
  74                 sig.sig32[2] = edx;
  75
  76                 log_debug("Virtualization found, CPUID=%s", sig.text);
  77
  78                 for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++)
  79                         if (streq(sig.text, cpuid_vendor_table[j].cpuid))
  80                                 return cpuid_vendor_table[j].id;
  81
  82                 return VIRTUALIZATION_VM_OTHER;
  83         }
  84 #endif
  85         log_debug("No virtualization found in CPUID");
  86
  87         return VIRTUALIZATION_NONE;
  88 }
  89
  90 static int detect_vm_device_tree(void) {
  91 #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__)
  92         _cleanup_free_ char *hvtype = NULL;
  93         int r;
  94
  95         r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype);
  96         if (r == -ENOENT) {
  97                 _cleanup_closedir_ DIR *dir = NULL;
  98                 struct dirent *dent;
  99
 100                 dir = opendir("/proc/device-tree");
 101                 if (!dir) {
 102                         if (errno == ENOENT) {
 103                                 log_debug_errno(errno, "/proc/device-tree: %m");
 104                                 return VIRTUALIZATION_NONE;
 105                         }
 106                         return -errno;
 107                 }
 108
 109                 FOREACH_DIRENT(dent, dir, return -errno)
 110                         if (strstr(dent->d_name, "fw-cfg")) {
 111                                 log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name);
 112                                 return VIRTUALIZATION_QEMU;
 113                         }
 114
 115                 log_debug("No virtualization found in /proc/device-tree/*");
 116                 return VIRTUALIZATION_NONE;
 117         } else if (r < 0)
 118                 return r;
 119
 120         log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype);
 121         if (streq(hvtype, "linux,kvm"))
 122                 return VIRTUALIZATION_KVM;
 123         else if (strstr(hvtype, "xen"))
 124                 return VIRTUALIZATION_XEN;
 125         else
 126                 return VIRTUALIZATION_VM_OTHER;
 127 #else
 128         log_debug("This platform does not support /proc/device-tree");
 129         return VIRTUALIZATION_NONE;
 130 #endif
 131 }
 132
 133 static int detect_vm_dmi(void) {
 134 #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
 135
 136         static const char *const dmi_vendors[] = {
 137                 "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */
 138                 "/sys/class/dmi/id/sys_vendor",
 139                 "/sys/class/dmi/id/board_vendor",
 140                 "/sys/class/dmi/id/bios_vendor"
 141         };
 142
 143         static const struct {
 144                 const char *vendor;
 145                 int id;
 146         } dmi_vendor_table[] = {
 147                 { "KVM",           VIRTUALIZATION_KVM       },
 148                 { "QEMU",          VIRTUALIZATION_QEMU      },
 149                 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
 150                 { "VMware",        VIRTUALIZATION_VMWARE    },
 151                 { "VMW",           VIRTUALIZATION_VMWARE    },
 152                 { "innotek GmbH",  VIRTUALIZATION_ORACLE    },
 153                 { "Xen",           VIRTUALIZATION_XEN       },
 154                 { "Bochs",         VIRTUALIZATION_BOCHS     },
 155                 { "Parallels",     VIRTUALIZATION_PARALLELS },
 156                 /* https://wiki.freebsd.org/bhyve */
 157                 { "BHYVE",         VIRTUALIZATION_BHYVE     },
 158         };
 159         unsigned i;
 160         int r;
 161
 162         for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
 163                 _cleanup_free_ char *s = NULL;
 164                 unsigned j;
 165
 166                 r = read_one_line_file(dmi_vendors[i], &s);
 167                 if (r < 0) {
 168                         if (r == -ENOENT)
 169                                 continue;
 170
 171                         return r;
 172                 }
 173
 174                 for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++)
 175                         if (startswith(s, dmi_vendor_table[j].vendor)) {
 176                                 log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]);
 177                                 return dmi_vendor_table[j].id;
 178                         }
 179         }
 180 #endif
 181
 182         log_debug("No virtualization found in DMI");
 183
 184         return VIRTUALIZATION_NONE;
 185 }
 186
 187 static int detect_vm_xen(void) {
 188
 189         /* Check for Dom0 will be executed later in detect_vm_xen_dom0
 190            The presence of /proc/xen indicates some form of a Xen domain */
 191         if (access("/proc/xen", F_OK) < 0) {
 192                 log_debug("Virtualization XEN not found, /proc/xen does not exist");
 193                 return VIRTUALIZATION_NONE;
 194         }
 195
 196         log_debug("Virtualization XEN found (/proc/xen exists)");
 197         return VIRTUALIZATION_XEN;
 198 }
 199
 200 #define XENFEAT_dom0 11 /* xen/include/public/features.h */
 201 #define PATH_FEATURES "/sys/hypervisor/properties/features"
 202 /* Returns -errno, or 0 for domU, or 1 for dom0 */
 203 static int detect_vm_xen_dom0(void) {
 204         _cleanup_free_ char *domcap = NULL;
 205         char *cap, *i;
 206         int r;
 207
 208         r = read_one_line_file(PATH_FEATURES, &domcap);
 209         if (r < 0 && r != -ENOENT)
 210                 return r;
 211         if (r == 0) {
 212                 unsigned long features;
 213
 214                 /* Here, we need to use sscanf() instead of safe_atoul()
 215                  * as the string lacks the leading "0x". */
 216                 r = sscanf(domcap, "%lx", &features);
 217                 if (r == 1) {
 218                         r = !!(features & (1U << XENFEAT_dom0));
 219                         log_debug("Virtualization XEN, found %s with value %08lx, "
 220                                   "XENFEAT_dom0 (indicating the 'hardware domain') is%s set.",
 221                                   PATH_FEATURES, features, r ? "" : " not");
 222                         return r;
 223                 }
 224                 log_debug("Virtualization XEN, found %s, unhandled content '%s'",
 225                           PATH_FEATURES, domcap);
 226         }
 227
 228         r = read_one_line_file("/proc/xen/capabilities", &domcap);
 229         if (r == -ENOENT) {
 230                 log_debug("Virtualization XEN because /proc/xen/capabilities does not exist");
 231                 return 0;
 232         }
 233         if (r < 0)
 234                 return r;
 235
 236         i = domcap;
 237         while ((cap = strsep(&i, ",")))
 238                 if (streq(cap, "control_d"))
 239                         break;
 240         if (!cap) {
 241                 log_debug("Virtualization XEN DomU found (/proc/xen/capabilites)");
 242                 return 0;
 243         }
 244
 245         log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)");
 246         return 1;
 247 }
 248
 249 static int detect_vm_hypervisor(void) {
 250         _cleanup_free_ char *hvtype = NULL;
 251         int r;
 252
 253         r = read_one_line_file("/sys/hypervisor/type", &hvtype);
 254         if (r == -ENOENT)
 255                 return VIRTUALIZATION_NONE;
 256         if (r < 0)
 257                 return r;
 258
 259         log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype);
 260
 261         if (streq(hvtype, "xen"))
 262                 return VIRTUALIZATION_XEN;
 263         else
 264                 return VIRTUALIZATION_VM_OTHER;
 265 }
 266
 267 static int detect_vm_uml(void) {
 268         _cleanup_free_ char *cpuinfo_contents = NULL;
 269         int r;
 270
 271         /* Detect User-Mode Linux by reading /proc/cpuinfo */
 272         r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
 273         if (r == -ENOENT) {
 274                 log_debug("/proc/cpuinfo not found, assuming no UML virtualization.");
 275                 return VIRTUALIZATION_NONE;
 276         }
 277         if (r < 0)
 278                 return r;
 279
 280         if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) {
 281                 log_debug("UML virtualization found in /proc/cpuinfo");
 282                 return VIRTUALIZATION_UML;
 283         }
 284
 285         log_debug("UML virtualization not found in /proc/cpuinfo.");
 286         return VIRTUALIZATION_NONE;
 287 }
 288
 289 static int detect_vm_zvm(void) {
 290
 291 #if defined(__s390__)
 292         _cleanup_free_ char *t = NULL;
 293         int r;
 294
 295         r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t);
 296         if (r == -ENOENT)
 297                 return VIRTUALIZATION_NONE;
 298         if (r < 0)
 299                 return r;
 300
 301         log_debug("Virtualization %s found in /proc/sysinfo", t);
 302         if (streq(t, "z/VM"))
 303                 return VIRTUALIZATION_ZVM;
 304         else
 305                 return VIRTUALIZATION_KVM;
 306 #else
 307         log_debug("This platform does not support /proc/sysinfo");
 308         return VIRTUALIZATION_NONE;
 309 #endif
 310 }
 311
 312 /* Returns a short identifier for the various VM implementations */
 313 int detect_vm(void) {
 314         static thread_local int cached_found = _VIRTUALIZATION_INVALID;
 315         bool other = false;
 316         int r, dmi;
 317
 318         if (cached_found >= 0)
 319                 return cached_found;
 320
 321         /* We have to use the correct order here:
 322          *
 323          * → First, try to detect Oracle Virtualbox, even if it uses KVM, as well as Xen even if it cloaks as Microsoft
 324          *   Hyper-V.
 325          *
 326          * → Second, try to detect from CPUID, this will report KVM for whatever software is used even if info in DMI is
 327          *   overwritten.
 328          *
 329          * → Third, try to detect from DMI. */
 330
 331         dmi = detect_vm_dmi();
 332         if (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN)) {
 333                 r = dmi;
 334                 goto finish;
 335         }
 336
 337         r = detect_vm_cpuid();
 338         if (r < 0)
 339                 return r;
 340         if (r == VIRTUALIZATION_VM_OTHER)
 341                 other = true;
 342         else if (r != VIRTUALIZATION_NONE)
 343                 goto finish;
 344
 345         /* Now, let's get back to DMI */
 346         if (dmi < 0)
 347                 return dmi;
 348         if (dmi == VIRTUALIZATION_VM_OTHER)
 349                 other = true;
 350         else if (dmi != VIRTUALIZATION_NONE) {
 351                 r = dmi;
 352                 goto finish;
 353         }
 354
 355         /* x86 xen will most likely be detected by cpuid. If not (most likely
 356          * because we're not an x86 guest), then we should try the /proc/xen
 357          * directory next. If that's not found, then we check for the high-level
 358          * hypervisor sysfs file.
 359          */
 360
 361         r = detect_vm_xen();
 362         if (r < 0)
 363                 return r;
 364         if (r == VIRTUALIZATION_VM_OTHER)
 365                 other = true;
 366         else if (r != VIRTUALIZATION_NONE)
 367                 goto finish;
 368
 369         r = detect_vm_hypervisor();
 370         if (r < 0)
 371                 return r;
 372         if (r == VIRTUALIZATION_VM_OTHER)
 373                 other = true;
 374         else if (r != VIRTUALIZATION_NONE)
 375                 goto finish;
 376
 377         r = detect_vm_device_tree();
 378         if (r < 0)
 379                 return r;
 380         if (r == VIRTUALIZATION_VM_OTHER)
 381                 other = true;
 382         else if (r != VIRTUALIZATION_NONE)
 383                 goto finish;
 384
 385         r = detect_vm_uml();
 386         if (r < 0)
 387                 return r;
 388         if (r == VIRTUALIZATION_VM_OTHER)
 389                 other = true;
 390         else if (r != VIRTUALIZATION_NONE)
 391                 goto finish;
 392
 393         r = detect_vm_zvm();
 394         if (r < 0)
 395                 return r;
 396
 397 finish:
 398         /* x86 xen Dom0 is detected as XEN in hypervisor and maybe others.
 399          * In order to detect the Dom0 as not virtualization we need to
 400          * double-check it */
 401         if (r == VIRTUALIZATION_XEN) {
 402                 int dom0;
 403
 404                 dom0 = detect_vm_xen_dom0();
 405                 if (dom0 < 0)
 406                         return dom0;
 407                 if (dom0 > 0)
 408                         r = VIRTUALIZATION_NONE;
 409         } else if (r == VIRTUALIZATION_NONE && other)
 410                 r = VIRTUALIZATION_VM_OTHER;
 411
 412         cached_found = r;
 413         log_debug("Found VM virtualization %s", virtualization_to_string(r));
 414         return r;
 415 }
 416 #endif // 0
 417
 418 int detect_container(void) {
 419
 420         static const struct {
 421                 const char *value;
 422                 int id;
 423         } value_table[] = {
 424                 { "lxc",            VIRTUALIZATION_LXC            },
 425                 { "lxc-libvirt",    VIRTUALIZATION_LXC_LIBVIRT    },
 426                 { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN },
 427                 { "docker",         VIRTUALIZATION_DOCKER         },
 428                 { "rkt",            VIRTUALIZATION_RKT            },
 429         };
 430
 431         static thread_local int cached_found = _VIRTUALIZATION_INVALID;
 432         _cleanup_free_ char *m = NULL;
 433         const char *e = NULL;
 434         unsigned j;
 435         int r;
 436
 437         if (cached_found >= 0)
 438                 return cached_found;
 439
 440         /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */
 441         if (access("/proc/vz", F_OK) >= 0 &&
 442             access("/proc/bc", F_OK) < 0) {
 443                 r = VIRTUALIZATION_OPENVZ;
 444                 goto finish;
 445         }
 446
 447         if (getpid_cached() == 1) {
 448                 /* If we are PID 1 we can just check our own environment variable, and that's authoritative. */
 449
 450                 e = getenv("container");
 451                 if (isempty(e)) {
 452                         r = VIRTUALIZATION_NONE;
 453                         goto finish;
 454                 }
 455
 456                 goto translate_name;
 457         }
 458
 459         /* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing
 460          * /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */
 461         r = read_one_line_file("/run/systemd/container", &m);
 462         if (r >= 0) {
 463                 e = m;
 464                 goto translate_name;
 465         }
 466         if (r != -ENOENT)
 467                 return log_debug_errno(r, "Failed to read /run/systemd/container: %m");
 468
 469         /* Fallback for cases where PID 1 was not systemd (for example, cases where init=/bin/sh is used. */
 470         r = getenv_for_pid(1, "container", &m);
 471         if (r > 0) {
 472                 e = m;
 473                 goto translate_name;
 474         }
 475         if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */
 476                 log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m");
 477
 478         /* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. Hence, if the PID shown
 479          * there is not 1, we know we are in a PID namespace. and hence a container. */
 480         r = read_one_line_file("/proc/1/sched", &m);
 481         if (r >= 0) {
 482                 const char *t;
 483
 484                 t = strrchr(m, '(');
 485                 if (!t)
 486                         return -EIO;
 487
 488                 if (!startswith(t, "(1,")) {
 489                         r = VIRTUALIZATION_CONTAINER_OTHER;
 490                         goto finish;
 491                 }
 492         } else if (r != -ENOENT)
 493                 return r;
 494
 495         /* If that didn't work, give up, assume no container manager. */
 496         r = VIRTUALIZATION_NONE;
 497         goto finish;
 498
 499 translate_name:
 500         for (j = 0; j < ELEMENTSOF(value_table); j++)
 501                 if (streq(e, value_table[j].value)) {
 502                         r = value_table[j].id;
 503                         goto finish;
 504                 }
 505
 506         r = VIRTUALIZATION_CONTAINER_OTHER;
 507
 508 finish:
 509         log_debug("Found container virtualization %s.", virtualization_to_string(r));
 510         cached_found = r;
 511         return r;
 512 }
 513
 514 #if 0 /// UNNEEDED by elogind
 515 int detect_virtualization(void) {
 516         int r;
 517
 518         r = detect_container();
 519         if (r == 0)
 520                 r = detect_vm();
 521
 522         return r;
 523 }
 524
 525 static int userns_has_mapping(const char *name) {
 526         _cleanup_fclose_ FILE *f = NULL;
 527         _cleanup_free_ char *buf = NULL;
 528         size_t n_allocated = 0;
 529         ssize_t n;
 530         uint32_t a, b, c;
 531         int r;
 532
 533         f = fopen(name, "re");
 534         if (!f) {
 535                 log_debug_errno(errno, "Failed to open %s: %m", name);
 536                 return errno == ENOENT ? false : -errno;
 537         }
 538
 539         n = getline(&buf, &n_allocated, f);
 540         if (n < 0) {
 541                 if (feof(f)) {
 542                         log_debug("%s is empty, we're in an uninitialized user namespace", name);
 543                         return true;
 544                 }
 545
 546                 return log_debug_errno(errno, "Failed to read %s: %m", name);
 547         }
 548
 549         r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c);
 550         if (r < 3)
 551                 return log_debug_errno(errno, "Failed to parse %s: %m", name);
 552
 553         if (a == 0 && b == 0 && c == UINT32_MAX) {
 554                 /* The kernel calls mappings_overlap() and does not allow overlaps */
 555                 log_debug("%s has a full 1:1 mapping", name);
 556                 return false;
 557         }
 558
 559         /* Anything else implies that we are in a user namespace */
 560         log_debug("Mapping found in %s, we're in a user namespace", name);
 561         return true;
 562 }
 563
 564 int running_in_userns(void) {
 565         _cleanup_free_ char *line = NULL;
 566         int r;
 567
 568         r = userns_has_mapping("/proc/self/uid_map");
 569         if (r != 0)
 570                 return r;
 571
 572         r = userns_has_mapping("/proc/self/gid_map");
 573         if (r != 0)
 574                 return r;
 575
 576         /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also
 577          * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups"
 578          * also does not exist. We cannot distinguish those two cases, so assume that
 579          * we're running on a stripped-down recent kernel, rather than on an old one,
 580          * and if the file is not found, return false.
 581          */
 582         r = read_one_line_file("/proc/self/setgroups", &line);
 583         if (r < 0) {
 584                 log_debug_errno(r, "/proc/self/setgroups: %m");
 585                 return r == -ENOENT ? false : r;
 586         }
 587
 588         truncate_nl(line);
 589         r = streq(line, "deny");
 590         /* See user_namespaces(7) for a description of this "setgroups" contents. */
 591         log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in");
 592         return r;
 593 }
 594 #endif // 0
 595
 596 int running_in_chroot(void) {
 597         int r;
 598
 599 #if 0 /// elogind does not allow to ignore chroots, we are never init!
 600         if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0)
 601                 return 0;
 602 #endif // 0
 603
 604         r = files_same("/proc/1/root", "/", 0);
 605         if (r < 0)
 606                 return r;
 607
 608         return r == 0;
 609 }
 610
 611 static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
 612         [VIRTUALIZATION_NONE] = "none",
 613         [VIRTUALIZATION_KVM] = "kvm",
 614         [VIRTUALIZATION_QEMU] = "qemu",
 615         [VIRTUALIZATION_BOCHS] = "bochs",
 616         [VIRTUALIZATION_XEN] = "xen",
 617         [VIRTUALIZATION_UML] = "uml",
 618         [VIRTUALIZATION_VMWARE] = "vmware",
 619         [VIRTUALIZATION_ORACLE] = "oracle",
 620         [VIRTUALIZATION_MICROSOFT] = "microsoft",
 621         [VIRTUALIZATION_ZVM] = "zvm",
 622         [VIRTUALIZATION_PARALLELS] = "parallels",
 623         [VIRTUALIZATION_BHYVE] = "bhyve",
 624         [VIRTUALIZATION_QNX] = "qnx",
 625         [VIRTUALIZATION_VM_OTHER] = "vm-other",
 626
 627         [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn",
 628         [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt",
 629         [VIRTUALIZATION_LXC] = "lxc",
 630         [VIRTUALIZATION_OPENVZ] = "openvz",
 631         [VIRTUALIZATION_DOCKER] = "docker",
 632         [VIRTUALIZATION_RKT] = "rkt",
 633         [VIRTUALIZATION_CONTAINER_OTHER] = "container-other",
 634 };
 635
 636 DEFINE_STRING_TABLE_LOOKUP(virtualization, int);