[Bug 288237] bhyve does not boot Rocky Linux 10 from ISO

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288237

--- Comment #15 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Zhenlei Huang from comment #13)
Any exception can be programmed to either cause VM exit or to be reflected
directly
into the VM.  For Intel VMX, see vol.3 26.6.3 Exception Bitmap.

By default, bhyve only sets the bit for the machine check exception in the
bitmask,
so all exceptions except #MC do not cause VM exits.  Apparently there is a
tunable
hw.vmm.trace_guest_exceptions which can be used to do VM exit on all exceptions
but then reflect them back (I never tried it).

In any case, even if #UD would be passed through VM exit, bhyve does not even
try to
emulate not implemented instructions.

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