[Bug 277559] kldload vmm sometimes hangs kernel on arm64

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277559

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |markj@FreeBSD.org
             Status|New                         |Open

--- Comment #4 from Mark Johnston <markj@FreeBSD.org> ---
vmmops_modinit() is using smp_rendezvous to execute code (arm_setup_vectors())
on each CPU.  Presumably one or more of the CPUs is hanging in the
vmm_call_hyp() call which initializes per-CPU state (various control registers)
in EL2.  This is done in handle_hyp_init in vmm_hyp_exception.S.

The first thing that routine does is initialize the vector table; I wonder if
that should be done last instead.  Perhaps there is a stray EL2 exception
occurring for some reason?

It would be useful to add printf("%d", curcpu)s around the vmm_call_hyp() calls
in arm_setup_vectors() to see if there is a pattern to the hangs.  We can also
try modifying vmm_call_hyp() to return early after various points, so as to try
and narrow down exactly where the hang is happening.

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