Facilitating processing within computing environments supporting pageable guests

A computer program product for executing a machine instruction in a computing environment, the 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, by a processor, a machine instruction for execution, the machine instruction being defined for computer execution according to a computer architecture, the machine instruction comprising:
• an operation code to specify an Extract and Set Storage Attributes operation;
• a field indicating an operation to be performed, the operation comprising at least one of an extract operation and a set operation;
• and
• a first register field to designate a first register;
• and
• executing the machine instruction, the executing comprising:
• based on the operation comprising an extract operation or a set operation, extracting into the first register, absent host involvement, one or more of guest state information of a block of memory assigned to a guest of the computing environment and host state information relating to the block of memory, the guest state information providing a state of the block of memory as it relates to the guest and indicating a particular meaning contents of the block of memory have to the guest.