diff --git a/hw/vmport.c b/hw/vmport.c
index a4f52ee5bb..3ab3a1405c 100644
--- a/hw/vmport.c
+++ b/hw/vmport.c
@@ -54,7 +54,8 @@ void vmport_register(unsigned char command, IOPortReadFunc *func, void *opaque)
     port_state->opaque[command] = opaque;
 }
 
-static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
+static uint64_t vmport_ioport_read(void *opaque, hwaddr addr,
+                                   unsigned size)
 {
     VMPortState *s = opaque;
     CPUX86State *env = cpu_single_env;
@@ -81,11 +82,12 @@ static uint32_t vmport_ioport_read(void *opaque, uint32_t addr)
     return s->func[command](s->opaque[command], addr);
 }
 
-static void vmport_ioport_write(void *opaque, uint32_t addr, uint32_t val)
+static void vmport_ioport_write(void *opaque, hwaddr addr,
+                                uint64_t val, unsigned size)
 {
     CPUX86State *env = cpu_single_env;
 
-    env->regs[R_EAX] = vmport_ioport_read(opaque, addr);
+    env->regs[R_EAX] = vmport_ioport_read(opaque, addr, 4);
 }
 
 static uint32_t vmport_cmd_get_version(void *opaque, uint32_t addr)
@@ -121,13 +123,14 @@ void vmmouse_set_data(const uint32_t *data)
     env->regs[R_ESI] = data[4]; env->regs[R_EDI] = data[5];
 }
 
-static const MemoryRegionPortio vmport_portio[] = {
-    {0, 1, 4, .read = vmport_ioport_read, .write = vmport_ioport_write },
-    PORTIO_END_OF_LIST(),
-};
-
 static const MemoryRegionOps vmport_ops = {
-    .old_portio = vmport_portio
+    .read = vmport_ioport_read,
+    .write = vmport_ioport_write,
+    .impl = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+    .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
 static int vmport_initfn(ISADevice *dev)