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...
