Hi,
I don't believe qemu-ga can use VirtIO serial ports.
I use qemu-ga for OpenBSD VM's on Proxmox.
The serial type needs to be set to ISA or this to work.
I found this out via the pkg-readme for qemu-ga (thank you Brad Smith).
Cheers
Joe
On 31/12/2025 3:33 pm, Paul B. Henson wrote:
> I'm running an openbsd vm under libvirt and trying to understand the
> current state of virtio-serial support, which is required for
> integrating the qemu-agent with libvirt.
>
> One of the devices seen during boot is:
>
> virtio2 at pci4 dev 0 function 0 "Qumranet Virtio 1.x Console" rev 0x01
> virtio2: no matching child driver; not configured
>
> which I think is the virtio-serial port, which is also known as
> "virtio-console" from what I can tell.
>
> There's a man page for viocon which is described as the "VirtIO console
> device" that "provides serial ports that are attached as ttys".
>
> This sounds like it would be used for the virtio-serial port qemu
> creates for the qemu-agent connection, but it doesn't seem to associate
> with the virtio device.
>
> Is viocon a driver for something else? Am I missing something obvious?
> Ah, it seems I am:
>
> sys/arch/amd64/conf/GENERIC:#viocon* at virtio? # Virtio console device
>
> It appears the driver isn't enabled in the default kernel config. While
> the devices used by it are created by default?
>
> crw-rw---- 1 root dialer 94, 0 Dec 28 22:02 /dev/ttyVI00
> crw-rw---- 1 root dialer 94, 10 Dec 28 22:02 /dev/ttyVI10
> crw-rw---- 1 root dialer 94, 20 Dec 28 22:02 /dev/ttyVI20
> crw-rw---- 1 root dialer 94, 30 Dec 28 22:02 /dev/ttyVI30
> crw-rw---- 1 root dialer 94, 40 Dec 28 22:02 /dev/ttyVI40
>
> Is the driver not production ready? Or just not used enough to make it
> worth enabling by default?
>
> Thanks much...
>
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