diff --git a/hw/qxl.c b/hw/qxl.c
index 416bd48..6e66021 100644
--- a/hw/qxl.c
+++ b/hw/qxl.c
@@ -409,6 +409,43 @@
     return "INVALID";
 }
 
+static const char *io_port_to_string(uint32_t io_port)
+{
+    if (io_port >= QXL_IO_RANGE_SIZE) {
+        return "out of range";
+    }
+    static const char *io_port_to_string[QXL_IO_RANGE_SIZE + 1] = {
+        [QXL_IO_NOTIFY_CMD]             = "QXL_IO_NOTIFY_CMD",
+        [QXL_IO_NOTIFY_CURSOR]          = "QXL_IO_NOTIFY_CURSOR",
+        [QXL_IO_UPDATE_AREA]            = "QXL_IO_UPDATE_AREA",
+        [QXL_IO_UPDATE_IRQ]             = "QXL_IO_UPDATE_IRQ",
+        [QXL_IO_NOTIFY_OOM]             = "QXL_IO_NOTIFY_OOM",
+        [QXL_IO_RESET]                  = "QXL_IO_RESET",
+        [QXL_IO_SET_MODE]               = "QXL_IO_SET_MODE",
+        [QXL_IO_LOG]                    = "QXL_IO_LOG",
+        [QXL_IO_MEMSLOT_ADD]            = "QXL_IO_MEMSLOT_ADD",
+        [QXL_IO_MEMSLOT_DEL]            = "QXL_IO_MEMSLOT_DEL",
+        [QXL_IO_DETACH_PRIMARY]         = "QXL_IO_DETACH_PRIMARY",
+        [QXL_IO_ATTACH_PRIMARY]         = "QXL_IO_ATTACH_PRIMARY",
+        [QXL_IO_CREATE_PRIMARY]         = "QXL_IO_CREATE_PRIMARY",
+        [QXL_IO_DESTROY_PRIMARY]        = "QXL_IO_DESTROY_PRIMARY",
+        [QXL_IO_DESTROY_SURFACE_WAIT]   = "QXL_IO_DESTROY_SURFACE_WAIT",
+        [QXL_IO_DESTROY_ALL_SURFACES]   = "QXL_IO_DESTROY_ALL_SURFACES",
+#if SPICE_INTERFACE_QXL_MINOR >= 1
+        [QXL_IO_UPDATE_AREA_ASYNC]      = "QXL_IO_UPDATE_AREA_ASYNC",
+        [QXL_IO_MEMSLOT_ADD_ASYNC]      = "QXL_IO_MEMSLOT_ADD_ASYNC",
+        [QXL_IO_CREATE_PRIMARY_ASYNC]   = "QXL_IO_CREATE_PRIMARY_ASYNC",
+        [QXL_IO_DESTROY_PRIMARY_ASYNC]  = "QXL_IO_DESTROY_PRIMARY_ASYNC",
+        [QXL_IO_DESTROY_SURFACE_ASYNC]  = "QXL_IO_DESTROY_SURFACE_ASYNC",
+        [QXL_IO_DESTROY_ALL_SURFACES_ASYNC]
+                                        = "QXL_IO_DESTROY_ALL_SURFACES_ASYNC",
+        [QXL_IO_FLUSH_SURFACES_ASYNC]   = "QXL_IO_FLUSH_SURFACES_ASYNC",
+        [QXL_IO_FLUSH_RELEASE]          = "QXL_IO_FLUSH_RELEASE",
+#endif
+    };
+    return io_port_to_string[io_port];
+}
+
 /* called from spice server thread context only */
 static int interface_get_command(QXLInstance *sin, struct QXLCommandExt *ext)
 {
@@ -1005,7 +1042,8 @@
     default:
         if (d->mode == QXL_MODE_NATIVE || d->mode == QXL_MODE_COMPAT)
             break;
-        dprint(d, 1, "%s: unexpected port 0x%x in vga mode\n", __FUNCTION__, io_port);
+        dprint(d, 1, "%s: unexpected port 0x%x (%s) in vga mode\n",
+            __func__, io_port, io_port_to_string(io_port));
         return;
     }