cpuid_base_hypervisor
return cpuid_base_hypervisor("ACRNACRNACRN", 0);
return cpuid_base_hypervisor(XEN_SIGNATURE, 2);
bhyve_cpuid_base = cpuid_base_hypervisor(BHYVE_SIGNATURE, 0);
return cpuid_base_hypervisor("Jailhouse\0\0\0", 0);
return cpuid_base_hypervisor(KVM_SIGNATURE, 0);