[Bug 297475] Bhyve does not recognize the proper processor topology for Intel N150 processir

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297475

--- Comment #3 from Jochen Neumeister <joneum@FreeBSD.org> ---
(In reply to Lexi Winter from comment #2)

Yes, the E-2468 is affected the same way.  It reports a maximum basic
leaf above 1Fh, so the guest takes the 1Fh path and reads the host's
values, where the SMT shift is 1 regardless of
machdep.hyperthreading_allowed, which only affects the host scheduler
and not CPUID.  With -c8 the guest derives 4 cores x 2 threads instead
of 8 x 1, and explicit topology settings have no effect because they
end up in leaf 0Bh, which the guest no longer reads.

D58885 adds the missing emulation of leaf 1Fh.  A test on that machine
would be very welcome.

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