Translation Exception Qualifier for Dynamic Address Translation
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Solution Overview
Problem
Current dynamic address translation facilities lack the ability to efficiently allocate a properly sized frame to back a guest frame, especially in guest configurations, leading to translation exceptions that do not specify whether the interruption was caused by a host or guest configuration, or if it pertains to a large or small frame.
Innovation Solution
A computer program product is introduced that includes a storage medium with instructions to perform a method of obtaining an address to be translated, storing a translation exception qualifier (TXQ) value to indicate whether the translation exception was caused by a guest or host program, and using this qualifier to determine the appropriate frame size during enhanced dynamic address translation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If dynamic address translation is implemented without translation exception qualifiers, then the basic address translation function is provided, but the system cannot distinguish whether a translation exception was caused by host or guest configuration, leading to inefficient memory management
Solution Approach 1:
The translation exception qualifier divides the exception handling information into distinct segments by introducing separate qualifier bits that identify the source (host vs. guest) and type of translation exception. This segmentation allows the system to track and respond to different exception sources independently without requiring complete redesign of the translation facility.
Solution Approach 2:
The translation exception qualifier acts as an intermediary element between the address translation mechanism and the exception handling logic. It provides intermediate information about the exception source and type, enabling the system to make informed decisions about memory frame allocation without directly complicating the core translation facility.
2Productivity
If the system uses generic translation exception handling, then implementation is simpler, but memory management efficiency decreases due to inability to allocate properly sized frames for guest configurations
Solution Approach 1:
The translation exception qualifier introduces dynamic differentiation into exception handling by providing qualifier bits that change based on the specific exception conditions (host vs. guest, large vs. small frame). This allows the system to adaptively respond to different exception scenarios, optimizing memory frame allocation for guest configurations while maintaining simpler handling paths for standard cases.
Solution Approach 2:
The system changes the parameter space of exception handling by adding qualifier bits that encode additional information about the exception source and type. This parameter expansion enables more precise control over memory management decisions without fundamentally altering the exception handling mechanism, balancing sophistication with operational simplicity.
3Manufacturing precision
If translation exception qualifiers are added to distinguish host and guest configurations, then frame allocation accuracy improves, but the translation facility structure becomes more complex
Solution Approach 1:
The qualifier structure segments exception information into distinct categories (source identification and exception type), allowing precise frame allocation decisions based on specific exception characteristics rather than requiring complex overall restructuring of the translation facility.
Solution Approach 2:
The translation exception qualifier adds another dimension to the translation facility by introducing qualifier bits that provide additional classification information. This dimensional addition enables precise frame allocation without requiring fundamental changes to the existing translation structure, effectively layering enhanced functionality on top of the base facility.
Data Source
AI summary
An enhanced dynamic address translation facility product is created such that, in one embodiment, a virtual address to be translated and an initial origin address of a translation table of the hierarchy of translation tables are obtained. Dynamic address translation of the virtual address proceeds. In response to a translation interruption having occurred during dynamic address translation, bits are stored in a translation exception qualifier (TXQ) field to indicate that the exception was either a host DAT exception having occurred while running a host program or a host DAT exception having occurred while running a guest program. The TXQ is further capable of indicating that the exception was associated with a host virtual address derived from a guest page frame real address or a guest segment frame absolute address. The TXQ is further capable of indicating that a larger or smaller host frame size is preferred to back a guest frame.