CA-308834: backport CA-307829 on havana (#264)

Signed-off-by: Taoyong Ding <[email protected]>

Author: taoyongd

xen/xenops_interface.ml

@@ -131,6 +131,7 @@ module Vgpu = struct
 	}
 
 	type state = {
+		active: bool;
 		plugged: bool;
 		emulator_pid: int option;
 	}