Hello everyone on the vbox-dev mailing list, *Introduction* I am considering contributing to VBox and add support for CPU performance counters. You might have encountered the lack of such support while using Perf, which will dispay *<not supported>* in place of, for example, the branch-misses that were requested. It is important to note that this is my first time contributing to VBox and I currently lack detailed knowledge of its' inner workings.
*The Problem* My current understanding of this problem is that VBox does not expose the necessary performance counter registers. I have been looking through the documentation for the CPUM component but I am having trouble wrapping my head around how VBox accesses registers from the host's CPU and exposes said registers (specifically the MSRs) to the guest, so I ask following questions: 1. How should I access (machine-specific) registers from the host's CPU using VBox's components. 2. How should I make these registers available to the guest in line with VBox's current architecture? I thank you in advance and remain with kind regards, David Golger
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