Index: sys/amd64/amd64/pmap.c
===================================================================
--- sys/amd64/amd64/pmap.c
+++ sys/amd64/amd64/pmap.c
@@ -1434,6 +1434,9 @@
 	sched_unpin();
 }
 
+/* 512 PTEs */
+#define	PMAP_INVLPG_THRESHOLD	(512 * PAGE_SIZE)
+
 void
 pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
 {
@@ -1441,6 +1444,11 @@
 	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;
Index: sys/i386/i386/pmap.c
===================================================================
--- sys/i386/i386/pmap.c
+++ sys/i386/i386/pmap.c
@@ -1016,6 +1016,9 @@
 	sched_unpin();
 }
 
+/* 512 PTEs */
+#define	PMAP_INVLPG_THRESHOLD	(512 * PAGE_SIZE)
+
 void
 pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
 {
@@ -1023,6 +1026,11 @@
 	vm_offset_t addr;
 	u_int cpuid;
 
+	if (eva - sva >= PMAP_INVLPG_THRESHOLD) {
+		pmap_invalidate_all(pmap);
+		return;
+	}
+
 	sched_pin();
 	if (pmap == kernel_pmap || !CPU_CMP(&pmap->pm_active, &all_cpus)) {
 		for (addr = sva; addr < eva; addr += PAGE_SIZE)