1. A method comprising: determining, by an intermediary manager executing via a virtual machine on a computer, whether a guest operating system located at the same virtual machine as the intermediary manager is operable with a particular hypervisor that is separate from the intermediary manager, wherein the intermediary manager is not the particular hypervisor; in response to determining that the guest operating system is not operable with the particular hypervisor: by the intermediary manager, intercepting from the guest operating system, a hypercall directed to the particular hypervisor that is separate from the intermediary manager; by the intermediary manager, determining that a particular intermediary service is associated with the hypercall; and by the intermediary manager, causing execution of service instructions associated with the particular intermediary service.