[Bug 268486] panic: vtd_add_device: device 0 is not in scope for any DMA remapping unit

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268486

--- Comment #3 from Eric Joyner <erj@freebsd.org> ---
Ok; I'm seeing the same problem on the dual processor Ice Lake-SP system that I
have, and I think I've found a temporary fix:

Go to /usr/src/sys/amd64/vmm/intel/vtd.c and change DRHD_MAX_UNITS from 8 to
10.

You can verify that your system probably has more DRHDs than what FreeBSD will
look at by doing "acpidump -dt" and checking the DMAR section and counting the
number of DRHD sections you find under there.

My system has exactly 10, and since FreeBSD was missing two of the sections,
some device scopes were missing. So, when FreeBSD decided to add all of the
devices in the system on iommu initialization, there existed devices with no
stored scopes, so the code there called panic().

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