Fabric, built on top of Invoke and Paramiko looks like a great tool to integrate with your best orchestration tool (Ansible, Chef, Salt...). Might give a try!
According to multiple sources it is a reference for numerical optimization. Haven't started studying it, but I'm looking forward to have the time
Nice introduction article on how kvm and QEMU works from the inside. It may need more details, but it is a very good start.