Maybe you can have a look at https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236922 "Bug 236922 Virtio fails as QEMU-KVM guest with Q35 chipset on Ubuntu 18.04.2 LTS"
it's from ~20 days ago and the bug is still open 

Il giorno mar 20 apr 2021 alle ore 14:16 Nur Imam Febrianto <nur_imam@outlook.com> ha scritto:

Seems strange. I want to use q35, but whenever I try even to start the installation (vm disk using virtio-scsi/virtio, net adapter using virtio) it always shows me the installer doesn’t detect any disk. I have an existing VM too that recently upgraded from 12.2 to 13. It uses i440FX with virtio-scsi disk and virtio network. If I try to change the machine into q35, it keeps stuck at boot after “promiscuous mode enabled”.

Don’t know what’s wrong. Using oVirt 4.4.5. Can you share your VM Config ?

 

From: Thomas Hoberg
Sent: 20 April 2021 17:27
To: users@ovirt.org
Subject: [ovirt-users] Re: FreeBSD 13 and virtio

 

q35 with BIOS as that is the cluster default with >4.3.

Running the dmesg messages through my mind as I remember them, the vio hardware may be all PCIe based, which would explain why this won't work on a virtual FX 440FX system, because those didn't have PCIe support AFAIK.

Any special reason why you'd want them based on 440FX?

And I also tested with GhostBSD, which is still 12.* based, and that doesn't seem to have vio support, at least I could not see a hard disk there, which confirms your observation there.
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