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Since no kernel objects can be created anymore outside Genode::core, the Vancouver port must be adjusted to use solely the Genode interfaces. The Vcpu_dispatcher creates all portals via the cpu_session interface and uses the feature to setup a specific receive window during a IPC (the cap_session::alloc IPC) to place to be received/to be mapped capability (virtualization exception portal) at the designed indexes. The actual vCPU thread extends from a normal Genode::Thread and extends it by specific vCPU requirements, which are a larger exception base window and the need by Vancouver to place the SM and EC cap at indexes next to each other. Fixes #316