Tour in Asia with two stops in Bejing

Hi, i plan to tour asias. I have a german passport. Starting from munich to bejing (staying 2 days to visit a friend) to ho chi min (vietnam). On the way back from kuala lumpur (malysia) to bejing (staying 2 days to visit a friend) to munich. Do i need a visa for the two stays in beijing?
Thanks.
Michael