/* Returns a short identifier for the various VM implementations */
int detect_vm(void) {
static thread_local int cached_found = _VIRTUALIZATION_INVALID;
- int r;
+ int r, dmi;
if (cached_found >= 0)
return cached_found;
/* We have to use the correct order here:
- * Some virtualization technologies do use KVM hypervisor but are
- * expected to be detected as something else. So detect DMI first.
*
- * An example is Virtualbox since version 5.0, which uses KVM backend.
- * Detection via DMI works corretly, the CPU ID would find KVM
- * only. */
- r = detect_vm_dmi();
+ * -> First try to detect Oracle Virtualbox, even if it uses KVM.
+ * -> Second try to detect from cpuid, this will report KVM for
+ * whatever software is used even if info in dmi is overwritten.
+ * -> Third try to detect from dmi. */
+
+ dmi = detect_vm_dmi();
+ if (dmi == VIRTUALIZATION_ORACLE) {
+ r = dmi;
+ goto finish;
+ }
+
+ r = detect_vm_cpuid();
if (r < 0)
return r;
if (r != VIRTUALIZATION_NONE)
goto finish;
- r = detect_vm_cpuid();
+ r = dmi;
if (r < 0)
return r;
if (r != VIRTUALIZATION_NONE)