X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Fvirt.c;h=c79d35db4dd258d17db20b2a66c02a3c9a258411;hp=1abd6863ea5aa5fb6d010113b8415eaed2a8e85d;hb=ec202eae8e84a4c99f054f771cb832046cb8769f;hpb=7080ea16b5a0bfd71bfcdffc998e91f5273d47f9 diff --git a/src/shared/virt.c b/src/shared/virt.c index 1abd6863e..c79d35db4 100644 --- a/src/shared/virt.c +++ b/src/shared/virt.c @@ -27,28 +27,10 @@ #include "virt.h" #include "fileio.h" -/* Returns a short identifier for the various VM implementations */ -int detect_vm(const char **id) { - -#if defined(__i386__) || defined(__x86_64__) +static int detect_vm_cpuid(const char **_id) { /* Both CPUID and DMI are x86 specific interfaces... */ - - static const char *const dmi_vendors[] = { - "/sys/class/dmi/id/sys_vendor", - "/sys/class/dmi/id/board_vendor", - "/sys/class/dmi/id/bios_vendor" - }; - - static const char dmi_vendor_table[] = - "QEMU\0" "qemu\0" - /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ - "VMware\0" "vmware\0" - "VMW\0" "vmware\0" - "Microsoft Corporation\0" "microsoft\0" - "innotek GmbH\0" "oracle\0" - "Xen\0" "xen\0" - "Bochs\0" "bochs\0"; +#if defined(__i386__) || defined(__x86_64__) static const char cpuid_vendor_table[] = "XenVMMXenVMM\0" "xen\0" @@ -63,26 +45,8 @@ int detect_vm(const char **id) { uint32_t sig32[3]; char text[13]; } sig = {}; - unsigned i; const char *j, *k; bool hypervisor; - _cleanup_free_ char *hvtype = NULL; - _cleanup_free_ char *cpuinfo_contents = NULL; - int r; - - /* Try high-level hypervisor sysfs file first: - * - * https://bugs.freedesktop.org/show_bug.cgi?id=61491 */ - r = read_one_line_file("/sys/hypervisor/type", &hvtype); - if (r >= 0) { - if (streq(hvtype, "xen")) { - if (id) - *id = "xen"; - - return 1; - } - } else if (r != -ENOENT) - return r; /* http://lwn.net/Articles/301888/ */ @@ -125,17 +89,44 @@ int detect_vm(const char **id) { NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table) if (streq(sig.text, j)) { - - if (id) - *id = k; - + *_id = k; return 1; } + + *_id = "other"; + return 0; } +#endif + + return 0; +} + +static int detect_vm_dmi(const char **_id) { + + /* Both CPUID and DMI are x86 specific interfaces... */ +#if defined(__i386__) || defined(__x86_64__) + + static const char *const dmi_vendors[] = { + "/sys/class/dmi/id/sys_vendor", + "/sys/class/dmi/id/board_vendor", + "/sys/class/dmi/id/bios_vendor" + }; + + static const char dmi_vendor_table[] = + "QEMU\0" "qemu\0" + /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ + "VMware\0" "vmware\0" + "VMW\0" "vmware\0" + "Microsoft Corporation\0" "microsoft\0" + "innotek GmbH\0" "oracle\0" + "Xen\0" "xen\0" + "Bochs\0" "bochs\0"; + unsigned i; for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { _cleanup_free_ char *s = NULL; - const char *found = NULL; + const char *j, *k; + int r; r = read_one_line_file(dmi_vendors[i], &s); if (r < 0) { @@ -146,42 +137,99 @@ int detect_vm(const char **id) { } NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table) - if (startswith(s, j)) - found = k; + if (startswith(s, j)) { + *_id = k; + return 1; + } + } +#endif - if (found) { - if (id) - *id = found; + return 0; +} - return 1; - } - } +/* Returns a short identifier for the various VM implementations */ +int detect_vm(const char **id) { + _cleanup_free_ char *hvtype = NULL, *cpuinfo_contents = NULL; + static thread_local int cached_found = -1; + static thread_local const char *cached_id = NULL; + const char *_id = NULL; + int r; + + if (_likely_(cached_found >= 0)) { - if (hypervisor || hvtype) { if (id) - *id = "other"; + *id = cached_id; - return 1; + return cached_found; } -#endif + /* Try high-level hypervisor sysfs file first: + * + * https://bugs.freedesktop.org/show_bug.cgi?id=61491 */ + r = read_one_line_file("/sys/hypervisor/type", &hvtype); + if (r >= 0) { + if (streq(hvtype, "xen")) { + _id = "xen"; + r = 1; + goto finish; + } + } else if (r != -ENOENT) + return r; + + /* this will set _id to "other" and return 0 for unknown hypervisors */ + r = detect_vm_cpuid(&_id); + if (r != 0) + goto finish; + + r = detect_vm_dmi(&_id); + if (r != 0) + goto finish; + + if (_id) { + /* "other" */ + r = 1; + goto finish; + } /* Detect User-Mode Linux by reading /proc/cpuinfo */ r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL); 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_local int cached_found = -1; + static thread_local 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 +237,61 @@ 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; }