Index: head/sys/amd64/vmm/vmm.c
===================================================================
--- head/sys/amd64/vmm/vmm.c
+++ head/sys/amd64/vmm/vmm.c
@@ -1235,22 +1235,6 @@
 		panic("Error %d setting state to %d", error, newstate);
 }
 
-static void
-vm_set_rendezvous_func(struct vm *vm, vm_rendezvous_func_t func)
-{
-
-	KASSERT(mtx_owned(&vm->rendezvous_mtx), ("rendezvous_mtx not locked"));
-
-	/*
-	 * Update 'rendezvous_func' and execute a write memory barrier to
-	 * ensure that it is visible across all host cpus. This is not needed
-	 * for correctness but it does ensure that all the vcpus will notice
-	 * that the rendezvous is requested immediately.
-	 */
-	vm->rendezvous_func = func;
-	wmb();
-}
-
 #define	RENDEZVOUS_CTR0(vm, vcpuid, fmt)				\
 	do {								\
 		if (vcpuid >= 0)					\
@@ -1281,7 +1265,7 @@
 		if (CPU_CMP(&vm->rendezvous_req_cpus,
 		    &vm->rendezvous_done_cpus) == 0) {
 			VCPU_CTR0(vm, vcpuid, "Rendezvous completed");
-			vm_set_rendezvous_func(vm, NULL);
+			vm->rendezvous_func = NULL;
 			wakeup(&vm->rendezvous_func);
 			break;
 		}
@@ -2535,7 +2519,7 @@
 	vm->rendezvous_req_cpus = dest;
 	CPU_ZERO(&vm->rendezvous_done_cpus);
 	vm->rendezvous_arg = arg;
-	vm_set_rendezvous_func(vm, func);
+	vm->rendezvous_func = func;
 	mtx_unlock(&vm->rendezvous_mtx);
 
 	/*