1. A computer program product comprising: a computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising: obtaining an indication of a guest frame to be cleared, said guest frame assigned to data resident in auxiliary storage and not resident in host main storage; and performing a clear operation on the guest frame, wherein the performing comprises logically clearing the guest frame absent paging-in to host main storage a block of host data from auxiliary storage to be assigned to the guest frame.