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