1. A method comprising: initializing a virtual guest on a host computing system, the host computing system comprising a virtual machine manager, the virtual machine manager managing operation of the virtual guest, the virtual guest comprising a distinct operating environment executing in a virtual operation platform provided by the virtual machine manager; receiving an allocation of run-time memory for the virtual guest, the allocation of run-time memory comprising a portion of run-time memory of the host computing system; and setting, by the virtual guest, at least a portion of the allocation of run-time memory to be inaccessible by the virtual machine manager.