[Bug 277326] FreeBSD guest on QEMU with Hyper-V enlightenment on is no longer able to detect Hyper-V devices

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277326

--- Comment #9 from Roger Pau Monné <royger@freebsd.org> ---
(In reply to ernis from comment #8)
I'm not doing any work on this because I think there's nothing to be fixed.

If FreeBSD runs on QEMU, and QEMU exposes part of the Viridian extensions, the
primary hypervisor should still be reported as QEMU, and hence the CPUID
detection is accurate.

The fact it was not like this originally is in my opinion a bug, and not a
behavior we should carry moving forward.

If there's a desire to use Viridian based extensions or devices on non-native
HyperV, then the HyperV code should be adjusted to deal with it.  It's however
complicated, as it's my understanding most hypervisors that expose part of the
Viridian extensions do so with Windows guests in mind only.  It's unclear
whether enabling both HyperV and native hypervisor virtualization assistances
or devices couldn't result in failure.

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