[Bug 290098] bhyve crashes when trying to run a 9front VM

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290098

            Bug ID: 290098
           Summary: bhyve crashes when trying to run a 9front VM
           Product: Base System
           Version: 15.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bhyve
          Assignee: virtualization@FreeBSD.org
          Reporter: bakul@iitbombay.org

The same 9front VM used to work fine on stable/14. The same issue occurs on
amd64 as well as Intel platforms. This is what bhyve prints before dying:

Assertion failed: (error == 0), function modify_bar_registration, file
/usr/src/usr.sbin/bhyve/pci_emul.c, line 706.
fbuf frame buffer base: 0x1018ff800000 [sz 33554432]

The same VM when started from a stable/14 machine works (albeit starts up much
slower since the VM files are on an NFS mount).

I see a number of changes to pci_emul.c (comparing git log of stable/14 and
stable/15) that may have a bearing on this.

Some people have reported this even happens when you try to create a new VM
using 9front installation.

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