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Allow the kernel to emulate the physical counter on arm64
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Authored by andrew on Jun 27 2022, 3:48 PM.
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Details

Summary

When running under a VM we don't have access to the physical counter.
Add support to emulate this instruction by handling the trap in the
kernel. As it is slow only enable when the hw.emulate_phys_counter
tunable is set on boot.

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rG FreeBSD src repository
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Event Timeline

This revision was not accepted when it landed; it landed in state Needs Review.Aug 25 2022, 11:18 AM
This revision was automatically updated to reflect the committed changes.