SMM Error Handling for Post-Reset Root Cause Reporting
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Solution Overview
Problem
Existing computing systems lack a mechanism to identify and report System Management Mode (SMM) errors after rebooting, leading to unexpected system resets without providing root cause information, which is time-consuming and resource-intensive for IT personnel to diagnose.
Innovation Solution
Implement a mechanism to monitor and capture SMM entry and exit information, check the success of the last SMM exit, and provide the SMM operating context information to the operating system (OS) after a reset, enabling the OS to create error records and notify users of the specific cause.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SMM operates in a separate address space inaccessible to other operating modes, then system transparency and isolation are improved, but error reporting capability after reboot deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism (SMM error handler and error information structure) that bridges the isolated SMM environment and the OS. This intermediary captures error information from SMM and translates it into a format accessible to the OS, allowing error reporting while maintaining SMM's isolation benefits.
Solution Approach 2:
The patent embeds error information capture and storage capabilities within the SMM error handler, which itself is nested within the firmware layer. The error information structure is then made accessible to the OS through a controlled interface, creating a nested architecture that preserves isolation while enabling information flow.
2Reliability
If SMM executes with high privileges in isolation, then system security and control are improved, but diagnostic capability after system reset deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the SMM error handler captures error information and provides it back to the OS through a structured interface. This feedback loop enables the OS to receive diagnostic information about SMM errors without compromising SMM's secure isolated execution environment.
Solution Approach 2:
The patent performs preliminary error information capture and packaging within the SMM error handler before the system reset occurs. This preliminary action ensures that error information is preserved and ready for OS processing after reboot, eliminating the need for post-reset diagnostic investigations.
3Device complexity
If no error reporting mechanism exists for SMM failures, then system simplicity is maintained, but troubleshooting time and resource consumption increase
Solution Approach 1:
The patent implements self-service error reporting where the SMM error handler automatically captures, packages, and transmits error information to the OS without requiring external diagnostic tools or manual investigation. This automated self-service approach maintains system simplicity while eliminating troubleshooting time losses.
Data Source
AI summary
The technology describe herein includes upon entering a mode of a processor that is not visible to an operating system (OS), setting a flag indicating entry into the mode and saving an identifier (ID) of an error causing entry into the mode; and responsive to a system reset initiation while in the mode, booting a basic input/output system (BIOS), creating an error record to be accessible to the OS after booting, the error record including the flag and the error ID, and booting the OS.