Virtual Device Driver for Virtualization Boot I/O
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Solution Overview
Problem
In virtualization environments, maintaining two sets of device drivers for the commodity operating system (COS) and the virtualization kernel leads to inefficiencies and shortcomings, particularly during the boot process, as I/O devices are often exclusively allocated to the COS, resulting in complex transfer and re-initialization processes and limited fault tolerance.
Innovation Solution
The method involves accessing I/O devices needed by the COS through the virtual machine kernel and its drivers, eliminating the need for exclusive allocation of I/O devices like storage and networking devices to the COS during booting, thereby allowing the COS to benefit from features provided by the virtual machine kernel for these devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If I/O devices are exclusively allocated to the COS during booting, then the COS can directly access these devices for boot operations, but the system complexity increases due to the need for driver transfer and re-initialization processes
Solution Approach 1:
The patent introduces a virtual device driver as an intermediary component that mediates between the COS and the physical I/O devices. This virtual driver is loaded into the COS during booting and provides a unified interface, eliminating the need for separate driver transfer processes while maintaining direct device access capability.
Solution Approach 2:
The virtual device driver serves multiple functions: it acts as a device driver for the COS, provides fault tolerance features, and enables resource sharing with the virtualization kernel. This multi-functionality consolidates what would otherwise require separate components, reducing overall system complexity.
2Reliability
If two sets of drivers are maintained for COS and virtualization kernel, then each component can have dedicated driver support, but system maintenance complexity and resource consumption increase
Solution Approach 1:
The patent merges the driver functionality into a single virtual device driver that serves both the COS and the virtualization kernel. This unified driver approach maintains the reliability benefits of dedicated support while eliminating the complexity of maintaining separate driver sets, as the virtual driver can be configured to provide fault tolerance and resource sharing capabilities.
3Productivity
If I/O devices are exclusively allocated to COS, then the boot process can proceed efficiently, but fault tolerance capabilities are limited
Solution Approach 1:
The virtual device driver implements dynamic resource management that allows the system to transition from exclusive COS allocation during booting to shared access modes during operation. This dynamic approach maintains boot efficiency while enabling fault tolerance through virtualization kernel intervention when needed.
Solution Approach 2:
The virtual device driver is pre-loaded into the COS during the booting process, providing fault tolerance capabilities before they are needed. This beforehand preparation ensures that when failures occur, the system can immediately leverage the virtualization kernel for recovery without delaying the boot process.
Data Source
AI summary
In a virtualization computer system, a method and system that does not exclusively allocate I/O devices, for example, storage and networking devices, to a commodity operating system (COS) when mainly used for booting the virtualization system. Those I/O devices needed by the COS are accessed via virtual machine kernel drivers, thereby giving the COS the benefits of operation derived from features in the virtual machine kernel that is provided for these I/O devices.