The restricted source and the PL/X source are not orderable or
shipped with z/VM. Both will be available as no-charge downloads
from IBM Resource Link at:
https://www.ibm.com/servers/resourcelink
If you are not registered with Resource Link, you will be require
to register for a user ID and password. You must also be licensed for
z/VM V6 or V7
and entitlement will be verified when you request the source
code. After approval, you will receive instructions describing how to
download the code.