Transparent conversion of common virtual storage

A system for implementing a transparent conversion of common virtual storage requests to storage with limited access, the system comprising:

• a storage medium, the storage medium being coupled to a processor;
• the processor configured to:
• provide a data address translation (DAT) structure configured to connect a higher-level DAT table to a lower-level DAT table, wherein the higher-level DAT table is initially disconnected from a lower-level DAT table associated with a common virtual storage;
• create the DAT structure based on a request from a process, wherein the DAT structure comprises a reference to one or more higher-level DAT tables, lower-level DAT tables, and data page tables;
• mark entries of the higher-level DAT table as disconnected from the common virtual storage and invalid for address spaces corresponding to a restricted-use portion of the common virtual storage;
• responsive to receiving a storage request, perform a DAT fault process based on validating user credentials associated with an entry of the higher-level DAT table corresponding to the storage request;
• and responsive to the validation, update the higher-level DAT table entry to allow access to the restricted-use portion of the common virtual storage, otherwise, return a DAT fault for the higher-level DAT table entry.

A computer program product for implementing a transparent conversion of common virtual storage requests to storage with limited access, the computer program product comprising a computer-readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to:

• provide a data address translation (DAT) structure configured to connect a higher-level DAT table to a lower-level DAT table, wherein the higher-level DAT table is initially disconnected from a lower-level DAT table associated with a common virtual storage;
• create the DAT structure based on a request from a process, wherein the DAT structure comprises a reference to one or more higher-level DAT tables, lower-level DAT tables, and data page tables;
• mark entries of the higher-level DAT table as disconnected from the common virtual storage and invalid for address spaces corresponding to a restricted-use portion of the common virtual storage;
• responsive to receiving a storage request, perform a DAT fault process based on validating user credentials associated with an entry of the higher-level DAT table corresponding to the storage request;
• and responsive to the validation, update the higher-level DAT table entry to allow access to the restricted-use portion of the common virtual storage, otherwise, return a DAT fault for the higher-level DAT table entry.