Index: sys/amd64/amd64/pmap.c
===================================================================
--- sys/amd64/amd64/pmap.c
+++ sys/amd64/amd64/pmap.c
@@ -1434,6 +1434,12 @@
 	sched_unpin();
 }
 
+/*
+ * Roughly PMAP_CLFLUSH_THRESHOLD * (PAGE_SIZE / CACHE_LINE_SIZE), or 32k
+ * potential TLB entries to invalidate.
+ */
+#define	PMAP_INVLPG_THRESHOLD	(128 * 1024 * 1024)
+
 void
 pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
 {
@@ -1441,6 +1447,11 @@
 	vm_offset_t addr;
 	u_int cpuid, i;
 
+	if (eva - sva >= PMAP_INVLPG_THRESHOLD) {
+		pmap_invalidate_all(pmap);
+		return;
+	}
+
 	if (pmap_type_guest(pmap)) {
 		pmap_invalidate_ept(pmap);
 		return;