User provided backing store objects and pagers. Message passing kernel using copy on write. Specify the inheritance of a region of VM Create and manage a memory object that can then be mapped into the address space of another process. Software page size is what the rest of the system uses. Physical memory is a cache for virtual memory.
Page table is indexed by physical page number.
Access to pager provide via a port. Byte ranges are mapped to parts of a memory object. Inheritance and protection carried in address map entries. Consult shadow object before checking the actual object.