D43508.id133022.diff
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	diff --git a/sys/x86/x86/identcpu.c b/sys/x86/x86/identcpu.c
	--- a/sys/x86/x86/identcpu.c
	+++ b/sys/x86/x86/identcpu.c
	@@ -1409,7 +1409,18 @@
	* If we found a specific hypervisor, then
	* we are finished.
	*/
	- if (vm_guest != VM_GUEST_VM)
	+ if (vm_guest != VM_GUEST_VM &&
	+ /*
	+ * Xen and other hypervisors can expose the
	+ * HyperV signature in addition to the
	+ * native one in order to support Viridian
	+ * extensions for Windows guests.
	+ *
	+ * Do the full cpuid scan if HyperV is
	+ * detected, as the native hypervisor is
	+ * preferred.
	+ */
	+ vm_guest != VM_GUEST_HV)
	return;
	}
	}