Index: sys/riscv/riscv/pmap.c
===================================================================
--- sys/riscv/riscv/pmap.c
+++ sys/riscv/riscv/pmap.c
@@ -3244,11 +3244,18 @@
 	critical_exit();
 }
 
+static void
+pmap_sync_icache_one(void *arg __unused)
+{
+
+	__asm __volatile("fence.i");
+}
+
 void
 pmap_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz)
 {
 
-	panic("RISCVTODO: pmap_sync_icache");
+	smp_rendezvous(NULL, pmap_sync_icache_one, NULL, NULL);
 }
 
 /*