[Bug 250802] bhyve exited with status 134 when GPU PCI passthrough

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250802

Peter Grehan <grehan at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |grehan at FreeBSD.org

--- Comment #6 from Peter Grehan <grehan at FreeBSD.org> ---
I just commented on the review: that patch shouldn't be needed (a comment on
why the assert is there could help I guess).

A possibility here is that the 64-bit PCI that bhyve reserves is out of
physical address range for that model CPU. The fix for this is to make the base
of this region dynamic after a CPUID to determine the max phys addr lines.

Another fix that Robert mentioned is to relax the overly-small 32MB restriction
on placing mmio bars in the PCI hole below 4G. It can be 256MB without any
issues, and 512MB with sorting of BARs.

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