IaaS policy is specified rule by rule over the subjects (end user, VM, hypervisor), operations (login, read, write, create) and objects (hypervisor, VMs on the same or other hosts, VMs of other providers, guest images, hardware resources), with environment conditions such as time, location and security impact level, and the designer decides for each rule whether access is permitted or denied from system requirements.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.