Creating a dynamic address translation with translation exception qualifiers

A computer system for qualifying a translation exception in a dynamic address translation (DAT) facility of a computing environment, the computer system comprising:

• a memory;
• and
• a processor in communication with the memory, wherein the computer system is configured to perform a method, said method comprising:
• obtaining an address to be translated;
• translating the address into another address of a desired block of main storage of the computing environment, the computing environment configured to run host programs and guest programs;
• and
• based on a translation exception event having occurred during translating the address, storing a translation exception qualifier (TXQ) value to indicate whether said translation exception event was caused by a guest program or a host program, the address comprising one of a guest referenced address referenced by said guest program and a host referenced address referenced by said host program, and wherein the TXQ value comprises:
• a first code based on said translation exception event being caused by said host referenced address encountering a host DAT exception;
• a second code based on said translation exception being caused by a host DAT translation of a host virtual address derived from said guest referenced address, the host virtual address not being derived from either a guest page table entry or a guest segment table entry comprising an enabled format control field;
• a third code based on said translation exception event being caused by host DAT translation of said host virtual address derived from said guest referenced address, the host virtual address comprising a guest page frame real address;
• and
• a fourth code based on said translation exception event being caused by host DAT translation of said host virtual address derived from said guest referenced address, the host virtual address comprising a guest segment frame absolute address.

A computer-implemented method of qualifying a translation exception in a dynamic address translation (DAT) facility of a computing environment, the computer-implemented method comprising:

• obtaining an address to be translated;
• translating the address into another address of a desired block of main storage of the computing environment, the computing environment configured to run host programs and guest programs;
• and
• based on a translation exception event having occurred during translating the address, storing a translation exception qualifier (TXQ) value to indicate whether said translation exception event was caused by a guest program or a host program, the address comprising one of a guest referenced address referenced by said guest program and a host referenced address referenced by said host program, and wherein the TXQ value comprises:
• a first code based on said translation exception event being caused by said host referenced address encountering a host DAT exception;
• a second code based on said translation exception being caused by a host DAT translation of a host virtual address derived from said guest referenced address, the host virtual address not being derived from either a guest page table entry or a guest segment table entry comprising an enabled format control field;
• a third code based on said translation exception event being caused by host DAT translation of said host virtual address derived from said guest referenced address, the host virtual address comprising a guest page frame real address;
• and
• a fourth code based on said translation exception event being caused by host DAT translation of said host virtual address derived from said guest referenced address, the host virtual address comprising a guest segment frame absolute address.