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diff --git a/palacios/include/palacios/vmm_io.h b/palacios/include/palacios/vmm_io.h
new file mode 100644
index 0000000..f13eee8
--- /dev/null
+++ b/palacios/include/palacios/vmm_io.h
@@ -0,0 +1,53 @@
+#ifndef __VMM_IO_H
+#define __VMM_IO_H
+
+#include <palacios/vmm_types.h>
+
+#include <palacios/vmm_util.h>
+
+// FOREACH_IO_HOOK(vmm_io_map_t * io_map, vmm_io_hook_t * io_hook)
+#define FOREACH_IO_HOOK(io_map, io_hook) for (io_hook = (io_map).head; io_hook != NULL; io_hook = (io_hook)->next)
+
+
+typedef struct vmm_io_hook {
+  ushort_t port;
+
+  // Reads data into the IO port (IN, INS)
+  int (*read)(ushort_t port, void * dst, uint_t length);
+
+  // Writes data from the IO port (OUT, OUTS)
+  int (*write)(ushort_t port, void * src, uint_t length);
+
+  struct vmm_io_hook * next;
+  struct vmm_io_hook * prev;
+
+} vmm_io_hook_t;
+
+
+typedef struct vmm_io_map {
+  uint_t num_ports;
+
+
+  vmm_io_hook_t * head;
+
+} vmm_io_map_t;
+
+
+void add_io_hook(vmm_io_map_t * io_map, vmm_io_hook_t * io_hook);
+
+
+
+vmm_io_hook_t * get_io_hook(vmm_io_map_t * io_map, uint_t port);
+
+
+/* External API */
+void hook_io_port(vmm_io_map_t * io_map, uint_t port, 
+		  int (*read)(ushort_t port, void * dst, uint_t length),
+		  int (*write)(ushort_t port, void * src, uint_t length));
+
+void init_vmm_io_map(vmm_io_map_t * io_map);
+
+void PrintDebugIOMap(vmm_io_map_t * io_map);
+
+
+#endif