--- Comment #2 from Dexuan Cui <> ---
The tsc-calibration fix was temporarily taken back last Friday because we found
an interesting thing: with some kind of config, Xen can pretend to be Hyper-V
by mimicking the hypervisor CPUID signature (this is usually to make Windows VM
run better on Xen), but Xen doesn’t support Hyper-V timecounter, so the fix
causes an unexpected panic when FreeBSD VM runs on Xen in this case.

We're making another patch to better detect if the underlying hypervisor
supports Hyper-V timecounter or not:

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