diff --git a/hw/serial.c b/hw/serial.c
index 3f79745..16af493 100644
--- a/hw/serial.c
+++ b/hw/serial.c
@@ -393,26 +393,6 @@
 		serial8250_in(dev, vcpu, addr - dev->iobase, data);
 }
 
-static bool serial8250_ioport_out(struct ioport *ioport, struct kvm_cpu *vcpu,
-				  u16 port, void *data, int size)
-{
-	struct serial8250_device *dev = ioport->priv;
-
-	serial8250_mmio(vcpu, port, data, 1, true, dev);
-
-	return true;
-}
-
-static bool serial8250_ioport_in(struct ioport *ioport, struct kvm_cpu *vcpu,
-				 u16 port, void *data, int size)
-{
-	struct serial8250_device *dev = ioport->priv;
-
-	serial8250_mmio(vcpu, port, data, 1, false, dev);
-
-	return true;
-}
-
 #ifdef CONFIG_HAS_LIBFDT
 
 char *fdt_stdout_path = NULL;
@@ -450,11 +430,6 @@
 }
 #endif
 
-static struct ioport_operations serial8250_ops = {
-	.io_in			= serial8250_ioport_in,
-	.io_out			= serial8250_ioport_out,
-};
-
 static int serial8250__device_init(struct kvm *kvm,
 				   struct serial8250_device *dev)
 {
@@ -465,7 +440,7 @@
 		return r;
 
 	ioport__map_irq(&dev->irq);
-	r = ioport__register(kvm, dev->iobase, &serial8250_ops, 8, dev);
+	r = kvm__register_pio(kvm, dev->iobase, 8, serial8250_mmio, dev);
 
 	return r;
 }
@@ -488,7 +463,7 @@
 	for (j = 0; j <= i; j++) {
 		struct serial8250_device *dev = &devices[j];
 
-		ioport__unregister(kvm, dev->iobase);
+		kvm__deregister_pio(kvm, dev->iobase);
 		device__unregister(&dev->dev_hdr);
 	}
 
@@ -504,7 +479,7 @@
 	for (i = 0; i < ARRAY_SIZE(devices); i++) {
 		struct serial8250_device *dev = &devices[i];
 
-		r = ioport__unregister(kvm, dev->iobase);
+		r = kvm__deregister_pio(kvm, dev->iobase);
 		if (r < 0)
 			return r;
 		device__unregister(&dev->dev_hdr);