Virtualization Extension Modules for Reduced Cross-Layer Control Transfers
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Solution Overview
Problem
The inefficiencies and operational overhead in virtualization systems due to frequent execution control transfers between multiple abstraction layers in virtualization architectures, particularly in synchronous and asynchronous communication mechanisms, adversely affect the overall performance and efficiency of virtual machine operations.
Innovation Solution
Implementing virtualization extension modules that leverage synchronous and asynchronous communication facilities to shift functionality between the VM controller, VMM, and guest layers, reducing the number of execution control transfers by offloading certain operations to these modules, including VM controller extension, VMM extension, and guest extension modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional virtualization architecture with multiple abstraction layers is used, then virtualization functionality is achieved, but execution control transfers frequently causing performance overhead
Solution Approach 1:
The patent extracts specific communication functions from the traditional multi-layer virtualization architecture and places them into dedicated extension modules. The VM controller extension module handles synchronous communication, the VMM extension module handles asynchronous communication, and the guest extension module provides interface functions. This extraction reduces the need for execution control transfers between abstraction layers by localizing communication handling within dedicated modules.
Solution Approach 2:
The patent introduces extension modules as intermediary components between the virtual machine, VMM, and VM controller. These modules act as mediators that handle communication requests locally before they need to traverse multiple abstraction layers. The guest extension module serves as an intermediary for guest OS communication, the VMM extension module intermediates asynchronous communication, and the VM controller extension module intermediates synchronous communication, thereby reducing execution control transfer overhead.
2Adaptability or versatility
If multiple abstraction layers are implemented for virtualization, then comprehensive virtualization control is achieved, but system complexity increases
Solution Approach 1:
The patent segments the virtualization control functionality into distinct extension modules, each with a specific responsibility. The VM controller extension module segment handles synchronous communication control, the VMM extension module segment handles asynchronous communication control, and the guest extension module segment handles guest OS interface operations. This segmentation maintains comprehensive virtualization control capability while organizing complexity into manageable, specialized components rather than a monolithic multi-layer architecture.
Solution Approach 2:
The extension modules are designed with multi-functional capabilities that allow them to handle multiple types of communication requests within a single module. For example, the VMM extension module handles various asynchronous communication operations (I/O requests, interrupts, DMA operations) without requiring separate abstraction layers for each operation type. This multi-functionality reduces architectural complexity while maintaining versatile virtualization control.
Data Source
AI summary
Systems and methods for processing virtual machine V/O requests by virtualization extension modules. An example method comprises receiving, by a virtual machine monitor (VMM) running on a host computer system, a request initiated by a virtual machine managed by the VMM; processing the request by a VMM extension module identified by one or more parameters of the request; invoking, by the VMM extension module, an application programming interface (API) exported by the VMM to perform an action identified by the request; and resuming execution of the virtual machine.