Hypervisor Virtual Machine Function State Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current virtualization systems face security risks and instability due to guests potentially bypassing security protections, corrupting virtual machine functions, and operating in unexpected modes, leading to crashes and unauthorized access to privileged pages.
Innovation Solution
The system implements a method where the hypervisor saves and loads the virtual machine function and guest states in a controlled manner using instructions like VMCLEAR, VMREAD, and VMWRITE, ensuring the states are in a known good state, and updates are passed through registers to prevent manipulation and corruption, thereby maintaining security and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hypervisor allows virtual machine functions to execute with full access to privileged memory, then performance is improved, but security is compromised as guests can bypass security protections and corrupt virtual machine functions
Solution Approach 1:
The patent segments memory access rights by creating separate privileged and unprivileged memory regions. The hypervisor maintains distinct page tables and access control mechanisms that allow virtual machine functions to access privileged memory only through controlled transitions, preventing guests from directly accessing or corrupting these regions while maintaining performance benefits.
Solution Approach 2:
The hypervisor acts as an intermediary between virtual machine functions and privileged memory. It uses controlled page table transitions and privilege level changes as intermediaries to mediate access, allowing performance-critical operations while maintaining security through the hypervisor's centralized control over memory access rights.
2Reliability
If the system implements comprehensive state saving and loading mechanisms, then security and stability are improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary state saving actions where the hypervisor automatically saves virtual machine function states before transitions to privileged modes and restores them after transitions. This preliminary action ensures systems are in known good states before critical operations, enhancing stability without requiring complex manual intervention.
Solution Approach 2:
The system uses copying mechanisms to create snapshots of virtual machine function states in the hypervisor's memory. These copies are made efficiently using memory mapping and page table operations, allowing state restoration without complex deep copying processes, thus maintaining stability while managing complexity.
3Reliability
If the hypervisor uses controlled page table transitions for state switching, then security is improved by preventing unauthorized access, but processing time increases
Solution Approach 1:
The patent implements periodic state saving and page table updates rather than continuous monitoring and adjustment. The hypervisor performs security checks and state transitions at specific trigger points (such as function entry/exit events), providing security through periodic validation while minimizing processing time compared to continuous protection mechanisms.
Data Source
AI summary
A system and method for virtual processor state switching virtual machine functions includes a memory, one or more processors, in communication with the memory, a virtual machine executing on the one or more processors, a virtual machine function executing on the virtual machine, and a hypervisor executing on the one or more processors. The hypervisor receives from the virtual machine function a request to save a state of the virtual machine function in hypervisor memory. Then, the hypervisor saves the state of the virtual machine function in the hypervisor memory.