https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288909

--- Comment #15 from Dag-Erling Smørgrav <[email protected]> ---
(In reply to Clint Street from comment #11)

The sysctl and tunable that actually controls vtd is hw.vmm.iommu.enable, which
is on by default (toggling it causes vtd_enable() / vtd_disable() to be
called).  Setting a non-existent tunable is harmless, so I'm sure your system
works great with it in loader.conf, but I promise you it will work equally well
without it.

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