Add function to assign ioeventfd to MMIO.

Signed-off-by: Cam Macdonell <cam@cs.ualberta.ca>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/kvm.h b/kvm.h
index 93f8187..50b6c01 100644
--- a/kvm.h
+++ b/kvm.h
@@ -175,6 +175,7 @@
 }
 
 #endif
+int kvm_set_ioeventfd_mmio_long(int fd, uint32_t adr, uint32_t val, bool assign);
 
 int kvm_set_ioeventfd_pio_word(int fd, uint16_t adr, uint16_t val, bool assign);
 #endif