Here is an academic exercise to create the Meltdown exploit prior to publication on Jan. 9th.  To keep honest with my CISSP certification, I didn't include all operating systems and the related, modern hypervisors exploits as it would be unethical to publish before Jan. 9th.  Enjoy your patch week and assurance testing.  

https://github.com/w8mej/Meltdown-Proof-of-Concept