GPU Profiling Tool Virtualization via Security Processor Register Allocation
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Solution Overview
Problem
Current virtualization schemes lack a mechanism for sharing, allocating, or deallocating registers for use as performance counters for different virtual functions associated with virtual machines, preventing the streaming of performance counter values to memory for inspection or other uses.
Innovation Solution
The proposed solution involves a security processor that allocates registers configured as performance counters to virtual functions upon request, with authorization checks and secure access management to ensure proper allocation and usage, and includes a method for restoring performance counter registers during virtual function restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If virtualization schemes are implemented to share hardware resources among multiple virtual machines, then resource utilization efficiency is improved, but the ability to allocate and manage performance counter registers for each virtual function is lost
Solution Approach 1:
The patent segments the performance counter register allocation by creating virtual function-specific register allocations. Each virtual function receives dedicated performance counter registers that can be independently configured and managed, allowing per-virtual-machine performance monitoring while maintaining overall virtualization efficiency.
Solution Approach 2:
The patent introduces a performance monitoring unit as an intermediary layer between the virtualization manager and the physical performance counters. This intermediary manages the allocation, configuration, and streaming of performance counter values to memory, enabling virtual functions to access performance data without direct hardware access.
2Measurement precision
If performance counter registers are allocated to virtual functions, then performance monitoring capability is improved, but system complexity increases due to authorization checks and secure access management
Solution Approach 1:
The performance monitoring unit automatically performs authorization checks and manages secure access to performance counter registers based on virtual function identities. The system self-manages the complexity of access control without requiring external intervention, streamlining the monitoring process while maintaining security.
Solution Approach 2:
The patent creates virtual copies of performance counter registers for each virtual function. These virtual registers mirror the functionality of physical counters but are managed software-defined, allowing complex access control and authorization logic to be implemented in the virtualization layer rather than hardware.
3Loss of information
If performance counter values are streamed to memory for inspection, then performance analysis capability is improved, but memory bandwidth and system resources are consumed
Solution Approach 1:
The patent implements periodic streaming of performance counter values to memory at configurable intervals. Instead of continuous streaming that would consume constant memory bandwidth, the system samples and transfers performance data at regular periods, reducing overall resource consumption while maintaining adequate monitoring capability.
Solution Approach 2:
The performance monitoring unit allows different virtual functions to have customized streaming configurations tailored to their specific monitoring needs. Critical performance counters can be streamed more frequently while less important ones are updated periodically or on-demand, optimizing memory bandwidth usage based on local requirements.
Data Source
AI summary
The present disclosure relates to techniques for allocating performance counters to virtual functions in response to a request from a respective one of the virtual functions. In response to receiving a request from a respective one of the virtual functions for a performance counter, a security processor is configured to allocate, via a controller, a register associated with a processor to the virtual function, such that the register is configured to implement the performance counter.