diff options
Diffstat (limited to 'src/shared/virt.c')
| -rw-r--r-- | src/shared/virt.c | 180 |
1 files changed, 86 insertions, 94 deletions
diff --git a/src/shared/virt.c b/src/shared/virt.c index 4f8134a773..537ccda654 100644 --- a/src/shared/virt.c +++ b/src/shared/virt.c @@ -60,6 +60,9 @@ int detect_vm(const char **id) { /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */ "Microsoft Hv\0" "microsoft\0"; + static __thread int cached_found = -1; + static __thread const char *cached_id = NULL; + uint32_t eax, ecx; union { uint32_t sig32[3]; @@ -69,6 +72,15 @@ int detect_vm(const char **id) { const char *j, *k; bool hypervisor; _cleanup_free_ char *hvtype = NULL; + const char *_id = NULL; + + if (_likely_(cached_found >= 0)) { + + if (id) + *id = cached_id; + + return cached_found; + } /* Try high-level hypervisor sysfs file first: * @@ -76,10 +88,9 @@ int detect_vm(const char **id) { r = read_one_line_file("/sys/hypervisor/type", &hvtype); if (r >= 0) { if (streq(hvtype, "xen")) { - if (id) - *id = "xen"; - - return 1; + _id = "xen"; + r = 1; + goto finish; } } else if (r != -ENOENT) return r; @@ -125,17 +136,14 @@ int detect_vm(const char **id) { NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table) if (streq(sig.text, j)) { - - if (id) - *id = k; - - return 1; + _id = k; + r = 1; + goto finish; } } for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { _cleanup_free_ char *s = NULL; - const char *found = NULL; r = read_one_line_file(dmi_vendors[i], &s); if (r < 0) { @@ -146,22 +154,17 @@ int detect_vm(const char **id) { } NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table) - if (startswith(s, j)) - found = k; - - if (found) { - if (id) - *id = found; - - return 1; - } + if (startswith(s, j)) { + _id = k; + r = 1; + goto finish; + } } if (hypervisor || hvtype) { - if (id) - *id = "other"; - - return 1; + _id = "other"; + r = 1; + goto finish; } #endif @@ -171,17 +174,40 @@ int detect_vm(const char **id) { if (r < 0) return r; if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) { - *id = "uml"; - return 1; + _id = "uml"; + r = 1; + goto finish; } - return 0; + r = 0; + +finish: + cached_found = r; + + cached_id = _id; + if (id) + *id = _id; + + return r; } int detect_container(const char **id) { + + static __thread int cached_found = -1; + static __thread const char *cached_id = NULL; + _cleanup_free_ char *e = NULL; + const char *_id = NULL; int r; + if (_likely_(cached_found >= 0)) { + + if (id) + *id = cached_id; + + return cached_found; + } + /* Unfortunately many of these operations require root access * in one way or another */ @@ -189,95 +215,61 @@ int detect_container(const char **id) { if (r < 0) return r; if (r > 0) { - - if (id) - *id = "chroot"; - - return 1; + _id = "chroot"; + goto finish; } /* /proc/vz exists in container and outside of the container, * /proc/bc only outside of the container. */ if (access("/proc/vz", F_OK) >= 0 && access("/proc/bc", F_OK) < 0) { - - if (id) - *id = "openvz"; - - return 1; + _id = "openvz"; + r = 1; + goto finish; } r = getenv_for_pid(1, "container", &e); - if (r <= 0) + if (r < 0) return r; + if (r == 0) + goto finish; /* We only recognize a selected few here, since we want to * enforce a redacted namespace */ - if (streq(e, "lxc")) { - if (id) - *id = "lxc"; - } else if (streq(e, "lxc-libvirt")) { - if (id) - *id = "lxc-libvirt"; - } else if (streq(e, "systemd-nspawn")) { - if (id) - *id = "systemd-nspawn"; - } else { - if (id) - *id = "other"; - } + if (streq(e, "lxc")) + _id ="lxc"; + else if (streq(e, "lxc-libvirt")) + _id = "lxc-libvirt"; + else if (streq(e, "systemd-nspawn")) + _id = "systemd-nspawn"; + else + _id = "other"; + +finish: + cached_found = r; + + cached_id = _id; + if (id) + *id = _id; return r; } /* Returns a short identifier for the various VM/container implementations */ Virtualization detect_virtualization(const char **id) { - - static __thread Virtualization cached_virt = _VIRTUALIZATION_INVALID; - static __thread const char *cached_id = NULL; - - const char *_id; int r; - Virtualization v; - - if (_likely_(cached_virt >= 0)) { - - if (id && cached_virt > 0) - *id = cached_id; - return cached_virt; - } - - r = detect_container(&_id); - if (r < 0) { - v = r; - goto finish; - } else if (r > 0) { - v = VIRTUALIZATION_CONTAINER; - goto finish; - } - - r = detect_vm(&_id); - if (r < 0) { - v = r; - goto finish; - } else if (r > 0) { - v = VIRTUALIZATION_VM; - goto finish; - } - - v = VIRTUALIZATION_NONE; - -finish: - if (v > 0) { - cached_id = _id; - - if (id) - *id = _id; - } + r = detect_container(id); + if (r < 0) + return r; + if (r > 0) + return VIRTUALIZATION_CONTAINER; - if (v >= 0) - cached_virt = v; + r = detect_vm(id); + if (r < 0) + return r; + if (r > 0) + return VIRTUALIZATION_VM; - return v; + return VIRTUALIZATION_NONE; } |