diff options
| -rw-r--r-- | src/shared/virt.c | 140 |
1 files changed, 81 insertions, 59 deletions
diff --git a/src/shared/virt.c b/src/shared/virt.c index 537ccda65..4e18638bc 100644 --- a/src/shared/virt.c +++ b/src/shared/virt.c @@ -27,30 +27,10 @@ #include "virt.h" #include "fileio.h" -/* Returns a short identifier for the various VM implementations */ -int detect_vm(const char **id) { - _cleanup_free_ char *cpuinfo_contents = NULL; - int r; - -#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" @@ -60,40 +40,13 @@ 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]; char text[13]; } sig = {}; - unsigned i; 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: - * - * 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; /* http://lwn.net/Articles/301888/ */ @@ -136,14 +89,44 @@ int detect_vm(const char **id) { NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table) if (streq(sig.text, j)) { - _id = k; - r = 1; - goto finish; + *_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 *j, *k; + int r; r = read_one_line_file(dmi_vendors[i], &s); if (r < 0) { @@ -155,20 +138,59 @@ int detect_vm(const char **id) { NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table) if (startswith(s, j)) { - _id = k; - r = 1; - goto finish; + *_id = k; + return 1; } } +#endif - if (hypervisor || hvtype) { - _id = "other"; + return 0; +} + +/* 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 int cached_found = -1; + static __thread const char *cached_id = NULL; + const char *_id = NULL; + int r; + + if (_likely_(cached_found >= 0)) { + + if (id) + *id = cached_id; + + return cached_found; + } + + /* 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; } -#endif - /* Detect User-Mode Linux by reading /proc/cpuinfo */ r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL); if (r < 0) |