src/basic/virt.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #if defined(__i386__) || defined(__x86_64__)
   4 #include <cpuid.h>
   5 #endif
   6 #include <errno.h>
   7 #include <stdint.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <unistd.h>
  11
  12 #include "alloc-util.h"
  13 #include "dirent-util.h"
  14 #include "def.h"
  15 #include "env-util.h"
  16 #include "fd-util.h"
  17 #include "fileio.h"
  18 #include "macro.h"
  19 #include "process-util.h"
  20 #include "stat-util.h"
  21 #include "string-table.h"
  22 #include "string-util.h"
  23 #include "virt.h"
  24
  25 static int detect_vm_cpuid(void) {
  26
  27         /* CPUID is an x86 specific interface. */
  28 #if defined(__i386__) || defined(__x86_64__)
  29
  30         static const struct {
  31                 const char *cpuid;
  32                 int id;
  33         } cpuid_vendor_table[] = {
  34                 { "XenVMMXenVMM", VIRTUALIZATION_XEN       },
  35                 { "KVMKVMKVM",    VIRTUALIZATION_KVM       },
  36                 { "TCGTCGTCGTCG", VIRTUALIZATION_QEMU      },
  37                 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
  38                 { "VMwareVMware", VIRTUALIZATION_VMWARE    },
  39                 /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */
  40                 { "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
  41                 /* https://wiki.freebsd.org/bhyve */
  42                 { "bhyve bhyve ", VIRTUALIZATION_BHYVE     },
  43                 { "QNXQVMBSQG",   VIRTUALIZATION_QNX       },
  44         };
  45
  46         uint32_t eax, ebx, ecx, edx;
  47         bool hypervisor;
  48
  49         /* http://lwn.net/Articles/301888/ */
  50
  51         /* First detect whether there is a hypervisor */
  52         if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0)
  53                 return VIRTUALIZATION_NONE;
  54
  55         hypervisor = ecx & 0x80000000U;
  56
  57         if (hypervisor) {
  58                 union {
  59                         uint32_t sig32[3];
  60                         char text[13];
  61                 } sig = {};
  62                 unsigned j;
  63
  64                 /* There is a hypervisor, see what it is */
  65                 __cpuid(0x40000000U, eax, ebx, ecx, edx);
  66
  67                 sig.sig32[0] = ebx;
  68                 sig.sig32[1] = ecx;
  69                 sig.sig32[2] = edx;
  70
  71                 log_debug("Virtualization found, CPUID=%s", sig.text);
  72
  73                 for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++)
  74                         if (streq(sig.text, cpuid_vendor_table[j].cpuid))
  75                                 return cpuid_vendor_table[j].id;
  76
  77                 return VIRTUALIZATION_VM_OTHER;
  78         }
  79 #endif
  80         log_debug("No virtualization found in CPUID");
  81
  82         return VIRTUALIZATION_NONE;
  83 }
  84
  85 static int detect_vm_device_tree(void) {
  86 #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__)
  87         _cleanup_free_ char *hvtype = NULL;
  88         int r;
  89
  90         r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype);
  91         if (r == -ENOENT) {
  92                 _cleanup_closedir_ DIR *dir = NULL;
  93                 struct dirent *dent;
  94
  95                 dir = opendir("/proc/device-tree");
  96                 if (!dir) {
  97                         if (errno == ENOENT) {
  98                                 log_debug_errno(errno, "/proc/device-tree: %m");
  99                                 return VIRTUALIZATION_NONE;
 100                         }
 101                         return -errno;
 102                 }
 103
 104                 FOREACH_DIRENT(dent, dir, return -errno)
 105                         if (strstr(dent->d_name, "fw-cfg")) {
 106                                 log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name);
 107                                 return VIRTUALIZATION_QEMU;
 108                         }
 109
 110                 log_debug("No virtualization found in /proc/device-tree/*");
 111                 return VIRTUALIZATION_NONE;
 112         } else if (r < 0)
 113                 return r;
 114
 115         log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype);
 116         if (streq(hvtype, "linux,kvm"))
 117                 return VIRTUALIZATION_KVM;
 118         else if (strstr(hvtype, "xen"))
 119                 return VIRTUALIZATION_XEN;
 120         else
 121                 return VIRTUALIZATION_VM_OTHER;
 122 #else
 123         log_debug("This platform does not support /proc/device-tree");
 124         return VIRTUALIZATION_NONE;
 125 #endif
 126 }
 127
 128 static int detect_vm_dmi(void) {
 129 #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
 130
 131         static const char *const dmi_vendors[] = {
 132                 "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */
 133                 "/sys/class/dmi/id/sys_vendor",
 134                 "/sys/class/dmi/id/board_vendor",
 135                 "/sys/class/dmi/id/bios_vendor"
 136         };
 137
 138         static const struct {
 139                 const char *vendor;
 140                 int id;
 141         } dmi_vendor_table[] = {
 142                 { "KVM",           VIRTUALIZATION_KVM       },
 143                 { "QEMU",          VIRTUALIZATION_QEMU      },
 144                 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
 145                 { "VMware",        VIRTUALIZATION_VMWARE    },
 146                 { "VMW",           VIRTUALIZATION_VMWARE    },
 147                 { "innotek GmbH",  VIRTUALIZATION_ORACLE    },
 148                 { "Xen",           VIRTUALIZATION_XEN       },
 149                 { "Bochs",         VIRTUALIZATION_BOCHS     },
 150                 { "Parallels",     VIRTUALIZATION_PARALLELS },
 151                 /* https://wiki.freebsd.org/bhyve */
 152                 { "BHYVE",         VIRTUALIZATION_BHYVE     },
 153         };
 154         unsigned i;
 155         int r;
 156
 157         for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
 158                 _cleanup_free_ char *s = NULL;
 159                 unsigned j;
 160
 161                 r = read_one_line_file(dmi_vendors[i], &s);
 162                 if (r < 0) {
 163                         if (r == -ENOENT)
 164                                 continue;
 165
 166                         return r;
 167                 }
 168
 169                 for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++)
 170                         if (startswith(s, dmi_vendor_table[j].vendor)) {
 171                                 log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]);
 172                                 return dmi_vendor_table[j].id;
 173                         }
 174         }
 175 #endif
 176
 177         log_debug("No virtualization found in DMI");
 178
 179         return VIRTUALIZATION_NONE;
 180 }
 181
 182 static int detect_vm_xen(void) {
 183
 184         /* Check for Dom0 will be executed later in detect_vm_xen_dom0
 185            The presence of /proc/xen indicates some form of a Xen domain */
 186         if (access("/proc/xen", F_OK) < 0) {
 187                 log_debug("Virtualization XEN not found, /proc/xen does not exist");
 188                 return VIRTUALIZATION_NONE;
 189         }
 190
 191         log_debug("Virtualization XEN found (/proc/xen exists)");
 192         return VIRTUALIZATION_XEN;
 193 }
 194
 195 #define XENFEAT_dom0 11 /* xen/include/public/features.h */
 196 #define PATH_FEATURES "/sys/hypervisor/properties/features"
 197 /* Returns -errno, or 0 for domU, or 1 for dom0 */
 198 static int detect_vm_xen_dom0(void) {
 199         _cleanup_free_ char *domcap = NULL;
 200         char *cap, *i;
 201         int r;
 202
 203         r = read_one_line_file(PATH_FEATURES, &domcap);
 204         if (r < 0 && r != -ENOENT)
 205                 return r;
 206         if (r == 0) {
 207                 unsigned long features;
 208
 209                 /* Here, we need to use sscanf() instead of safe_atoul()
 210                  * as the string lacks the leading "0x". */
 211                 r = sscanf(domcap, "%lx", &features);
 212                 if (r == 1) {
 213                         r = !!(features & (1U << XENFEAT_dom0));
 214                         log_debug("Virtualization XEN, found %s with value %08lx, "
 215                                   "XENFEAT_dom0 (indicating the 'hardware domain') is%s set.",
 216                                   PATH_FEATURES, features, r ? "" : " not");
 217                         return r;
 218                 }
 219                 log_debug("Virtualization XEN, found %s, unhandled content '%s'",
 220                           PATH_FEATURES, domcap);
 221         }
 222
 223         r = read_one_line_file("/proc/xen/capabilities", &domcap);
 224         if (r == -ENOENT) {
 225                 log_debug("Virtualization XEN because /proc/xen/capabilities does not exist");
 226                 return 0;
 227         }
 228         if (r < 0)
 229                 return r;
 230
 231         i = domcap;
 232         while ((cap = strsep(&i, ",")))
 233                 if (streq(cap, "control_d"))
 234                         break;
 235         if (!cap) {
 236                 log_debug("Virtualization XEN DomU found (/proc/xen/capabilites)");
 237                 return 0;
 238         }
 239
 240         log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)");
 241         return 1;
 242 }
 243
 244 static int detect_vm_hypervisor(void) {
 245         _cleanup_free_ char *hvtype = NULL;
 246         int r;
 247
 248         r = read_one_line_file("/sys/hypervisor/type", &hvtype);
 249         if (r == -ENOENT)
 250                 return VIRTUALIZATION_NONE;
 251         if (r < 0)
 252                 return r;
 253
 254         log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype);
 255
 256         if (streq(hvtype, "xen"))
 257                 return VIRTUALIZATION_XEN;
 258         else
 259                 return VIRTUALIZATION_VM_OTHER;
 260 }
 261
 262 static int detect_vm_uml(void) {
 263         _cleanup_fclose_ FILE *f = NULL;
 264         int r;
 265
 266         /* Detect User-Mode Linux by reading /proc/cpuinfo */
 267         f = fopen("/proc/cpuinfo", "re");
 268         if (!f) {
 269                 if (errno == ENOENT) {
 270                         log_debug("/proc/cpuinfo not found, assuming no UML virtualization.");
 271                         return VIRTUALIZATION_NONE;
 272                 }
 273                 return -errno;
 274         }
 275
 276         for (;;) {
 277                 _cleanup_free_ char *line = NULL;
 278                 const char *t;
 279
 280                 r = read_line(f, LONG_LINE_MAX, &line);
 281                 if (r < 0)
 282                         return r;
 283                 if (r == 0)
 284                         break;
 285
 286                 t = startswith(line, "vendor_id\t: ");
 287                 if (t) {
 288                         if (startswith(t, "User Mode Linux")) {
 289                                 log_debug("UML virtualization found in /proc/cpuinfo");
 290                                 return VIRTUALIZATION_UML;
 291                         }
 292
 293                         break;
 294                 }
 295         }
 296
 297         log_debug("UML virtualization not found in /proc/cpuinfo.");
 298         return VIRTUALIZATION_NONE;
 299 }
 300
 301 static int detect_vm_zvm(void) {
 302
 303 #if defined(__s390__)
 304         _cleanup_free_ char *t = NULL;
 305         int r;
 306
 307         r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t);
 308         if (r == -ENOENT)
 309                 return VIRTUALIZATION_NONE;
 310         if (r < 0)
 311                 return r;
 312
 313         log_debug("Virtualization %s found in /proc/sysinfo", t);
 314         if (streq(t, "z/VM"))
 315                 return VIRTUALIZATION_ZVM;
 316         else
 317                 return VIRTUALIZATION_KVM;
 318 #else
 319         log_debug("This platform does not support /proc/sysinfo");
 320         return VIRTUALIZATION_NONE;
 321 #endif
 322 }
 323
 324 /* Returns a short identifier for the various VM implementations */
 325 int detect_vm(void) {
 326         static thread_local int cached_found = _VIRTUALIZATION_INVALID;
 327         bool other = false;
 328         int r, dmi;
 329
 330         if (cached_found >= 0)
 331                 return cached_found;
 332
 333         /* We have to use the correct order here:
 334          *
 335          * → First, try to detect Oracle Virtualbox, even if it uses KVM, as well as Xen even if it cloaks as Microsoft
 336          *   Hyper-V.
 337          *
 338          * → Second, try to detect from CPUID, this will report KVM for whatever software is used even if info in DMI is
 339          *   overwritten.
 340          *
 341          * → Third, try to detect from DMI. */
 342
 343         dmi = detect_vm_dmi();
 344         if (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN)) {
 345                 r = dmi;
 346                 goto finish;
 347         }
 348
 349         r = detect_vm_cpuid();
 350         if (r < 0)
 351                 return r;
 352         if (r == VIRTUALIZATION_VM_OTHER)
 353                 other = true;
 354         else if (r != VIRTUALIZATION_NONE)
 355                 goto finish;
 356
 357         /* Now, let's get back to DMI */
 358         if (dmi < 0)
 359                 return dmi;
 360         if (dmi == VIRTUALIZATION_VM_OTHER)
 361                 other = true;
 362         else if (dmi != VIRTUALIZATION_NONE) {
 363                 r = dmi;
 364                 goto finish;
 365         }
 366
 367         /* x86 xen will most likely be detected by cpuid. If not (most likely
 368          * because we're not an x86 guest), then we should try the /proc/xen
 369          * directory next. If that's not found, then we check for the high-level
 370          * hypervisor sysfs file.
 371          */
 372
 373         r = detect_vm_xen();
 374         if (r < 0)
 375                 return r;
 376         if (r == VIRTUALIZATION_VM_OTHER)
 377                 other = true;
 378         else if (r != VIRTUALIZATION_NONE)
 379                 goto finish;
 380
 381         r = detect_vm_hypervisor();
 382         if (r < 0)
 383                 return r;
 384         if (r == VIRTUALIZATION_VM_OTHER)
 385                 other = true;
 386         else if (r != VIRTUALIZATION_NONE)
 387                 goto finish;
 388
 389         r = detect_vm_device_tree();
 390         if (r < 0)
 391                 return r;
 392         if (r == VIRTUALIZATION_VM_OTHER)
 393                 other = true;
 394         else if (r != VIRTUALIZATION_NONE)
 395                 goto finish;
 396
 397         r = detect_vm_uml();
 398         if (r < 0)
 399                 return r;
 400         if (r == VIRTUALIZATION_VM_OTHER)
 401                 other = true;
 402         else if (r != VIRTUALIZATION_NONE)
 403                 goto finish;
 404
 405         r = detect_vm_zvm();
 406         if (r < 0)
 407                 return r;
 408
 409 finish:
 410         /* x86 xen Dom0 is detected as XEN in hypervisor and maybe others.
 411          * In order to detect the Dom0 as not virtualization we need to
 412          * double-check it */
 413         if (r == VIRTUALIZATION_XEN) {
 414                 int dom0;
 415
 416                 dom0 = detect_vm_xen_dom0();
 417                 if (dom0 < 0)
 418                         return dom0;
 419                 if (dom0 > 0)
 420                         r = VIRTUALIZATION_NONE;
 421         } else if (r == VIRTUALIZATION_NONE && other)
 422                 r = VIRTUALIZATION_VM_OTHER;
 423
 424         cached_found = r;
 425         log_debug("Found VM virtualization %s", virtualization_to_string(r));
 426         return r;
 427 }
 428
 429 int detect_container(void) {
 430
 431         static const struct {
 432                 const char *value;
 433                 int id;
 434         } value_table[] = {
 435                 { "lxc",            VIRTUALIZATION_LXC            },
 436                 { "lxc-libvirt",    VIRTUALIZATION_LXC_LIBVIRT    },
 437                 { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN },
 438                 { "docker",         VIRTUALIZATION_DOCKER         },
 439                 { "rkt",            VIRTUALIZATION_RKT            },
 440         };
 441
 442         static thread_local int cached_found = _VIRTUALIZATION_INVALID;
 443         _cleanup_free_ char *m = NULL;
 444         const char *e = NULL;
 445         unsigned j;
 446         int r;
 447
 448         if (cached_found >= 0)
 449                 return cached_found;
 450
 451         /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */
 452         if (access("/proc/vz", F_OK) >= 0 &&
 453             access("/proc/bc", F_OK) < 0) {
 454                 r = VIRTUALIZATION_OPENVZ;
 455                 goto finish;
 456         }
 457
 458         if (getpid_cached() == 1) {
 459                 /* If we are PID 1 we can just check our own environment variable, and that's authoritative. */
 460
 461                 e = getenv("container");
 462                 if (isempty(e)) {
 463                         r = VIRTUALIZATION_NONE;
 464                         goto finish;
 465                 }
 466
 467                 goto translate_name;
 468         }
 469
 470         /* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing
 471          * /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */
 472         r = read_one_line_file("/run/systemd/container", &m);
 473         if (r >= 0) {
 474                 e = m;
 475                 goto translate_name;
 476         }
 477         if (r != -ENOENT)
 478                 return log_debug_errno(r, "Failed to read /run/systemd/container: %m");
 479
 480         /* Fallback for cases where PID 1 was not systemd (for example, cases where init=/bin/sh is used. */
 481         r = getenv_for_pid(1, "container", &m);
 482         if (r > 0) {
 483                 e = m;
 484                 goto translate_name;
 485         }
 486         if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */
 487                 log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m");
 488
 489         /* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. Hence, if the PID shown
 490          * there is not 1, we know we are in a PID namespace. and hence a container. */
 491         r = read_one_line_file("/proc/1/sched", &m);
 492         if (r >= 0) {
 493                 const char *t;
 494
 495                 t = strrchr(m, '(');
 496                 if (!t)
 497                         return -EIO;
 498
 499                 if (!startswith(t, "(1,")) {
 500                         r = VIRTUALIZATION_CONTAINER_OTHER;
 501                         goto finish;
 502                 }
 503         } else if (r != -ENOENT)
 504                 return r;
 505
 506         /* If that didn't work, give up, assume no container manager. */
 507         r = VIRTUALIZATION_NONE;
 508         goto finish;
 509
 510 translate_name:
 511         for (j = 0; j < ELEMENTSOF(value_table); j++)
 512                 if (streq(e, value_table[j].value)) {
 513                         r = value_table[j].id;
 514                         goto finish;
 515                 }
 516
 517         r = VIRTUALIZATION_CONTAINER_OTHER;
 518
 519 finish:
 520         log_debug("Found container virtualization %s.", virtualization_to_string(r));
 521         cached_found = r;
 522         return r;
 523 }
 524
 525 int detect_virtualization(void) {
 526         int r;
 527
 528         r = detect_container();
 529         if (r == 0)
 530                 r = detect_vm();
 531
 532         return r;
 533 }
 534
 535 static int userns_has_mapping(const char *name) {
 536         _cleanup_fclose_ FILE *f = NULL;
 537         _cleanup_free_ char *buf = NULL;
 538         size_t n_allocated = 0;
 539         ssize_t n;
 540         uint32_t a, b, c;
 541         int r;
 542
 543         f = fopen(name, "re");
 544         if (!f) {
 545                 log_debug_errno(errno, "Failed to open %s: %m", name);
 546                 return errno == ENOENT ? false : -errno;
 547         }
 548
 549         n = getline(&buf, &n_allocated, f);
 550         if (n < 0) {
 551                 if (feof(f)) {
 552                         log_debug("%s is empty, we're in an uninitialized user namespace", name);
 553                         return true;
 554                 }
 555
 556                 return log_debug_errno(errno, "Failed to read %s: %m", name);
 557         }
 558
 559         r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c);
 560         if (r < 3)
 561                 return log_debug_errno(errno, "Failed to parse %s: %m", name);
 562
 563         if (a == 0 && b == 0 && c == UINT32_MAX) {
 564                 /* The kernel calls mappings_overlap() and does not allow overlaps */
 565                 log_debug("%s has a full 1:1 mapping", name);
 566                 return false;
 567         }
 568
 569         /* Anything else implies that we are in a user namespace */
 570         log_debug("Mapping found in %s, we're in a user namespace", name);
 571         return true;
 572 }
 573
 574 int running_in_userns(void) {
 575         _cleanup_free_ char *line = NULL;
 576         int r;
 577
 578         r = userns_has_mapping("/proc/self/uid_map");
 579         if (r != 0)
 580                 return r;
 581
 582         r = userns_has_mapping("/proc/self/gid_map");
 583         if (r != 0)
 584                 return r;
 585
 586         /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also
 587          * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups"
 588          * also does not exist. We cannot distinguish those two cases, so assume that
 589          * we're running on a stripped-down recent kernel, rather than on an old one,
 590          * and if the file is not found, return false.
 591          */
 592         r = read_one_line_file("/proc/self/setgroups", &line);
 593         if (r < 0) {
 594                 log_debug_errno(r, "/proc/self/setgroups: %m");
 595                 return r == -ENOENT ? false : r;
 596         }
 597
 598         truncate_nl(line);
 599         r = streq(line, "deny");
 600         /* See user_namespaces(7) for a description of this "setgroups" contents. */
 601         log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in");
 602         return r;
 603 }
 604
 605 int running_in_chroot(void) {
 606         int r;
 607
 608         if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0)
 609                 return 0;
 610
 611         r = files_same("/proc/1/root", "/", 0);
 612         if (r < 0)
 613                 return r;
 614
 615         return r == 0;
 616 }
 617
 618 static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
 619         [VIRTUALIZATION_NONE] = "none",
 620         [VIRTUALIZATION_KVM] = "kvm",
 621         [VIRTUALIZATION_QEMU] = "qemu",
 622         [VIRTUALIZATION_BOCHS] = "bochs",
 623         [VIRTUALIZATION_XEN] = "xen",
 624         [VIRTUALIZATION_UML] = "uml",
 625         [VIRTUALIZATION_VMWARE] = "vmware",
 626         [VIRTUALIZATION_ORACLE] = "oracle",
 627         [VIRTUALIZATION_MICROSOFT] = "microsoft",
 628         [VIRTUALIZATION_ZVM] = "zvm",
 629         [VIRTUALIZATION_PARALLELS] = "parallels",
 630         [VIRTUALIZATION_BHYVE] = "bhyve",
 631         [VIRTUALIZATION_QNX] = "qnx",
 632         [VIRTUALIZATION_VM_OTHER] = "vm-other",
 633
 634         [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn",
 635         [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt",
 636         [VIRTUALIZATION_LXC] = "lxc",
 637         [VIRTUALIZATION_OPENVZ] = "openvz",
 638         [VIRTUALIZATION_DOCKER] = "docker",
 639         [VIRTUALIZATION_RKT] = "rkt",
 640         [VIRTUALIZATION_CONTAINER_OTHER] = "container-other",
 641 };
 642
 643 DEFINE_STRING_TABLE_LOOKUP(virtualization, int);