Secure Access of Performance Monitoring Unit by User Space Profilers White Paper Coll

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• Author: Coll

This paper proposes a software mechanism targeting performance profilers which would run at user space privilege to access performance monitoring hardware. The latter requires privileged access in kernel mode, in a secure manner without causing unintended interference to the software stack.

Table of contents:

1
2
Introduction …………………………………………………………………………….5
1.1
Scope …………………………………………………………………………… 6
Implementation ……………………………………………………………………….7
2.1
Security Model ………………………………………………………………… 7
2.2
Access Layer Requirements…………………………………………………. 7
2.3
Sharing Model …………………………………………………………………. 8
2.4
Architectural Perfmon vs. Model Specific …………………………………. 8
2.5
Counter Wrapping ……………………………………………………………. 8
2.6
List of Registers for Secure Access by User-Space Profilers …………… 8
Tables
Table 2-1. Configuration Registers for PMU and Non-PMU Counters …………. 9
Table 2-2. PMU Counter Registers ………………………………………………….. 9
Table 2-3. Other Counter Registers1 ……………………………………………….10

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