What hypervisor do you use in the cloud, and also what core operating system do you use to run the game?asked by Captain Steve

Yeah, currently we are on GCE, Google Compute Engine. The hypervisor used over there is their own custom KVM. I don't believe that the hypervisor we use would be... I mean, yeah, there are different ways of implementing how we abstract the CPU instructions from the bare metal to the VMs, but I don't think we would have an issue whether we're running on Xen or on KVM.