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Differential D35613

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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kib
markj
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arm64
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rG278111b8a541: Allow the kernel to emulate the physical counter on arm64
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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andrew created this revision.Jun 27 2022, 3:48 PM
Herald added a subscriber: imp. · View Herald TranscriptJun 27 2022, 3:48 PM
andrew requested review of this revision.Jun 27 2022, 3:48 PM
Harbormaster completed remote builds in B46134: Diff 107435.Jun 27 2022, 3:48 PM
This revision was not accepted when it landed; it landed in state Needs Review.Aug 25 2022, 11:18 AM
Closed by commit rG278111b8a541: Allow the kernel to emulate the physical counter on arm64 (authored by andrew). · Explain Why
This revision was automatically updated to reflect the committed changes.
andrew added a commit: rG278111b8a541: Allow the kernel to emulate the physical counter on arm64.

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sys/
arm/
arm/
46 lines

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sys/arm/arm/generic_timer.c

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