Index: head/sys/amd64/vmm/x86.c
===================================================================
--- head/sys/amd64/vmm/x86.c
+++ head/sys/amd64/vmm/x86.c
@@ -437,7 +437,7 @@
 				    CPUID_STDEXT_AVX512ER |
 				    CPUID_STDEXT_AVX512CD | CPUID_STDEXT_SHA);
 				regs[2] = 0;
-				regs[3] = 0;
+				regs[3] &= CPUID_STDEXT3_MD_CLEAR;
 
 				/* Advertise INVPCID if it is enabled. */
 				error = vm_get_capability(vm, vcpu_id,