[Bug 261590] virtio_console fails to create ttyV* devices on 12.3-RELEASE

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261590

            Bug ID: 261590
           Summary: virtio_console fails to create ttyV* devices on
                    12.3-RELEASE
           Product: Base System
           Version: 12.3-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: geraud@gcu.info

We are using FreeBSD VMs under the Proxmox virtualization system, and
qemu-guest-agent to interact with them from the hypervizor.

Last week I upgraded one of our 12.2-RELEASE VM to 12.3-RELEASE and noticed
that the qemu-guest-agent didn't work as expected. Upon further verification,
it looks like the virtio_console doesn't create a /dev/ttyV0.1 as it previously
did.

Running `pciconf -lv` indeed doesn't report a 'Virtio console' device anymore.

I'll admit that I'm perfectly clueless on how to debug/fix this kind of issues,
any pointers will be much appreciated.

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