Index: sys/amd64/conf/GENERIC
===================================================================
--- sys/amd64/conf/GENERIC	(revision 285548)
+++ sys/amd64/conf/GENERIC	(working copy)
@@ -366,3 +366,7 @@
 
 # The crypto framework is required by IPSEC
 device		crypto			# Required by IPSEC
+
+options		KTR
+options		KTR_ENTRIES=(1024*1024)
+options		KTR_MASK=(KTR_GEN)
Index: sys/amd64/vmm/amd/svm.c
===================================================================
--- sys/amd64/vmm/amd/svm.c	(revision 285548)
+++ sys/amd64/vmm/amd/svm.c	(working copy)
@@ -1508,6 +1508,11 @@
 	    handled ? "handled" : "unhandled", exit_reason_to_str(code),
 	    vmexit->rip, vmexit->inst_length);
 
+#ifdef KTR
+	if (code == VMCB_EXIT_NMI)
+		ktr_mask = 0;
+#endif
+
 	if (handled) {
 		vmexit->rip += vmexit->inst_length;
 		vmexit->inst_length = 0;