Hi Dominik,
Does installing mlnx-ofed-basic enables a CentOS 8 based oVirt host to
use Infiniband?
it should. After a fresh CentOS install ("minimal install") I enable
Mellanox repo, dnf install mlnx-ofed-basic -y, and I can see ib0 device
(and I can get IP via DHCP for example).
I still didn't try to use real infiniband functionalities (in our
scenario NFS over IP over IB), but I'm quite confident about this.