1. A method of validating operations by a physical adapter in a logically partitioned data processing system, the method comprising the computer implemented steps of: associating each of a plurality of address spaces with respective virtual adapter identifiers, wherein each address space is maintained in the physical adapter and defines respective addresses of a physical adapter memory; receiving, by the physical adapter, an input/output operation from a virtual host of a plurality of virtual hosts, wherein the input/output operation includes an identifier of the virtual host and an-address; obtaining a first address space of the plurality of address spaces associated with the virtual host by looking up the address space with the identifier; and evaluating whether the address is in the first address space.