Load EPT Instruction for Direct Guest Physical Address Conversion
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Solution Overview
Problem
Conventional processors lack a mechanism to directly convert a guest physical address into a true physical address during virtualization, relying on the standard address translation process, which is inefficient and limits direct memory access in virtualized environments.
Innovation Solution
A processor with an extended page table (EPT) translation mechanism and a load EPT instruction that directly invokes the EPT translation mechanism to convert guest physical addresses into true physical addresses, using an EPT paging structure and tablewalk engine for accurate and efficient conversions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the standard address translation process is used to convert guest physical addresses to true physical addresses, then the conversion can be performed, but the process is inefficient and limits direct memory access
Solution Approach 1:
The patent extracts the EPT address conversion functionality from the standard address translation process by introducing a dedicated load EPT instruction. This instruction directly invokes the EPT tablewalk engine to perform address conversions outside the normal translation path, enabling efficient direct memory access in virtualized environments without relying on the inefficient standard process.
2Adaptability or versatility
If virtualization is enabled with EPT mechanism, then address translation capability is enhanced, but device complexity increases
Solution Approach 1:
The load EPT instruction serves multiple functions: it enables direct address conversion, supports virtualization operations, and provides a standardized interface for EPT operations. By creating a universal instruction that handles EPT address conversion, the patent reduces the need for multiple specialized mechanisms while maintaining full virtualization support capability.
3Productivity
If direct EPT conversion is implemented, then memory access efficiency is improved, but risk of misconfigurations and violations increases
Solution Approach 1:
The load EPT instruction incorporates feedback mechanisms through the EPT tablewalk engine that automatically detect and report misconfigurations and violations during address conversion. This feedback system allows the processor to identify configuration errors and access violations, providing reliability checks that prevent silent failures while maintaining efficient direct memory access.
Data Source
AI summary
A processor including an extended page table (EPT) translation mechanism that is enabled for virtualization, and a load EPT instruction. When executed by the processor, the load EPT instruction directly invokes the EPT translation mechanism to directly convert a provided guest physical address into a corresponding true physical address. The EPT translation mechanism may include an EPT paging structure and an EPT tablewalk engine. The EPT paging structure is generated and stored in an external system memory when the EPT translation mechanism is enabled. The EPT tablewalk engine is configured to access the EPT paging structure for the physical address conversion. The EPT tablewalk engine may perform relevant checks to trigger EPT misconfigurations and EPT violations during execution of the load EPT instruction.