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If the only purpose is to enable a clean shutdown, as moonman said: It works fine already with qemu using ACPI. (Edit: I just checked. Reboot works cleanly as well.)
Just instruct qemu to shut down the opnsense guest, and the guest goes through a proper shutdown procedure.
If there are other things that might be wanted from a guest package, I'm all ears, but currently FreeBSD/OPNsense already supports all of the important virtio drivers and proper shutdown with qemu. There doesn't seem to be any functionality left to add.
Just instruct qemu to shut down the opnsense guest, and the guest goes through a proper shutdown procedure.
If there are other things that might be wanted from a guest package, I'm all ears, but currently FreeBSD/OPNsense already supports all of the important virtio drivers and proper shutdown with qemu. There doesn't seem to be any functionality left to add.
