Lightweight Virtual Machine Manager Error Capture via Guest OS Intermediary
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Solution Overview
Problem
Lightweight virtual machine managers (VMMs) lack the necessary resources to perform memory dumps during internal errors, as they often lack file system access support, which is removed to minimize their footprint and reduce resource consumption, thereby hindering error capture and troubleshooting.
Innovation Solution
The system facilitates error capture by invoking guest OSs to transfer error information from shared volatile memory to non-volatile storage using native or customized file system access mechanisms, employing communication interfaces like HyperCall or VMCALL, and utilizing VMX transactions to manage VM behavior and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If file system access support is removed from lightweight VMMs to minimize footprint and reduce resource consumption, then resource consumption is reduced, but error capture capability deteriorates
Solution Approach 1:
The patent introduces a guest operating system as an intermediary component that possesses file system access capabilities. When a VMM error occurs, the guest OS acts as a mediator to capture and store error information (such as memory dumps) to non-volatile storage, thereby compensating for the VMM's lack of direct file system access while maintaining the lightweight VMM's minimal resource footprint.
2Device complexity
If file system access support is removed from lightweight VMMs to minimize footprint, then device complexity is reduced, but error capture capability deteriorates
Solution Approach 1:
The guest operating system serves as an intermediary that provides file system access capabilities to the VMM error handling process. This allows the VMM to remain lightweight and simple in structure while still achieving error capture functionality through the guest OS's file system interface.
Solution Approach 2:
The system separates the VMM's core virtualization functions from the file system access functionality. The VMM focuses on resource management and error detection, while the guest OS handles file system operations for error information storage. This segmentation allows the VMM to maintain minimal complexity while achieving comprehensive error capture capability.
Data Source
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AI summary
Methods and apparatus are disclosed to capture error conditions in lightweight virtual machine managers. A disclosed example method includes defining a shared memory structure between the VMM and a virtual machine (VM), when the VM is spawned by the VMM, installing an abort handler on the VM associated with a vector value, in response to detecting an error, transferring VMM state information to the shared memory structure, and invoking the abort handler on the VM to transfer contents of the shared memory structure to a non-volatile memory.