Index: sys/vm/vm_reserv.c
===================================================================
--- sys/vm/vm_reserv.c
+++ sys/vm/vm_reserv.c
@@ -1344,7 +1344,8 @@
 	 */
 	ppn_align = (int)(ulmin(ulmax(PAGE_SIZE, alignment),
 	    VM_LEVEL_0_SIZE) >> PAGE_SHIFT);
-	ppn_bound = (int)(MIN(MAX(PAGE_SIZE, boundary),
+	ppn_bound = boundary == 0 ? VM_LEVEL_0_NPAGES :
+	    (int)(MIN(MAX(PAGE_SIZE, boundary),
             VM_LEVEL_0_SIZE) >> PAGE_SHIFT);
 
 	vm_reserv_domain_scan_lock(domain);