The 2 port card was added during the summer as replacement for the older Intel card and I probably was lucky with timing as I just fixed the ID's to modprobe.conf. I checked the dmesg logs and you are correct about reserving all the interfaces to either one. With 6.4.8 igb gets all the interfaces and with 6.5 onwards vfio-pci wins. So libvirt with 6.4.8 KVM can reclaim interface from the igb. So maybe I don't need the modprobe config at all... The base config for libvirt qemu FW started probably around 2014 when I started using KVM and it has survived couple of HW and OS upgrades :D. I will try without modprobe and check that driverctl so I can figure this out. Thanks for the help, -Juhani On Tue, Oct 31, 2023 at 6:19 PM Alex Williamson <alex.williamson@xxxxxxxxxx> wrote: > > Do you launch your VMs with libvirt, which might have automatically > bound the devices to vfio-pci and now there's something loading the > vfio-pci module before igb? Libvirt is running the show. What I forgot to mention is that 2 port version i recent replacement in 6.4 the era (old card was intel card but using e1000 driver). I probably was lucky with timing as I just fixed the ID's to modprobe.conf and everything continued to work. I checked the dmesg logs and you are correct about reserving all the interfaces to either driver. With 6.4.8 igb gets all the interfaces and with 6.5 onwards vfio-pci wins. Libvirt with 6.4.8 KVM can reclaim interface from the igb. So maybe I don't need the modprobe config at all. The base config for the libvirt qemu FW config started around 2014 when I started using KVM and it has survived couple of HW and OS upgrades. > > The driverctl tool might be useful for you to specify a specific > driver for specific devices. Otherwise I'm not sure what kernel change > might have triggered this behavioral change without knowing more about > how and when the vfio-pci module is loaded relative to the igb module. I will try without the modprobe and check that driverctl so I can figure this out. > Thanks, > > Alex > Thanks for the help. I half suspected that I messed up something :D. -Juhani -- Juhani Rautiainen jrauti@xxxxxx
