Recursive logical partition real memory map

A method, in a data processing system, for accessing submitted by a process of a currently active logical partition, comprising:

• receiving a first address based on an address submitted from the process of the currently active logical partition;
• translating the first address into a second address using a recursive logical partition real memory (RLPRM) map data structure for the currently active logical partition;
• and
• accessing the memory using the second address, wherein the RLPRM map data structure provides a plurality of translation table pointers, each translation table pointer pointing to a separate page table for a separate level of virtualization in the data processing system, the data processing system supporting multiple levels of virtualization, wherein:
• the RLPRM map data structure stores an entry for each level of virtualization in the multiple levels of virtualization,
• the entry comprises at least one of a limit value, a type value, a translation interrupt vector, or a corresponding translation table pointer in the plurality of translation table pointers,
• the translation interrupt vector points to code that handles a page fault for a level of virtualization corresponding to the entry,
• the limit value identifies a maximum number of levels of virtualization supported by the data processing system, and
• the type value identifies a type of page table being used by the level of virtualization corresponding to the entry.

An apparatus, comprising:

• a processor;
• and
• a memory coupled to the processor, wherein the processor operates to:
• receive a first address based on an address submitted from a process of a currently active logical partition;
• translate the first address into a second address using a recursive logical partition real memory (RLPRM) map data structure for the currently active logical partition;
• and
• access the memory using the second address, wherein the RLPRM map data structure provides a plurality of translation table pointers, each translation table pointer pointing to a separate page table for a separate level of virtualization in the apparatus, the apparatus supporting multiple levels of virtualization, wherein the apparatus further comprises a translation cache, and wherein entries in the translation cache include a virtualization level indicator.

An apparatus, comprising:

• a processor;
• and
• a memory coupled to the processor, wherein the processor operates to:
• receive a first address based on an address submitted from a process of a currently active logical partition;
• translate the first address into a second address using a recursive logical partition real memory (RLPRM) map data structure for the currently active logical partition;
• and
• access the memory using the second address, wherein the RLPRM map data structure provides a plurality of translation table pointers, each translation table pointer pointing to a separate page table for a separate level of virtualization in the apparatus, the apparatus supporting multiple levels of virtualization, wherein:
• the RLPRM map data structure stores an entry for each level of virtualization in the multiple levels of virtualization,
• the entry comprises at least one of a limit value, a type value, a translation interrupt vector, or a corresponding the plurality of translation table pointers,
• the translation interrupt vector points to code that handles a page fault for a level of virtualization corresponding to the entry,
• the limit value identifies a maximum number of levels of virtualization supported by the data processing system, and
• the type value identifies a type of page table being used by the level of virtualization corresponding to the entry.

A computer program product comprising a computer recordable storage medium having a computer readable program recorded thereon, wherein the computer readable program, when executed on a computing device, causes the computing device to:

• receive a first address based on an address submitted from a process of a currently active logical partition;
• translate the first address into a second address using a recursive logical partition real memory (RLPRM) map data structure for the currently active logical partition;
• and
• access the memory using the second address, wherein the RLPRM map data structure provides a plurality of translation table pointers, each translation table pointer pointing to a separate page table for a separate level of virtualization in the computing device, the computing device supporting multiple levels of virtualization, wherein the computing device comprises a translation cache, and wherein entries in the translation cache include a virtualization level indicator.