> Sent: Friday, June 14, 2024 at 9:33 AM > From: "Michal Prívozník" <mprivozn@xxxxxxxxxx> > To: "daggs" <daggs@xxxxxxx> > Cc: users@xxxxxxxxxxxxxxxxx > Subject: Re: vfio usage in a vm > > On 6/13/24 18:18, daggs wrote: > > Greetings Michal, > > > > I think I might be doing something wrong, all the devices are defined a such: > > <interface type='network'> > > <mac address='52:54:xx:xx:xx:xx'/> > > <source network='mynet'/> > > <model type='virtio'/> > > <address type='pci' domain='0x0000' bus='0x10' slot='0x0x' function='0x0'/> > > </interface> > > > > and I still cannot get vfio to attached to them. > > they are autobinded to virtio_pci so I had to unbind them first > > when I reload the vfio module, I get the same errors below > > > > Ah, so I've misunderstood what you meant. Virtio and VFIO are two > different approaches. While the former is for emulated devices, the > latter is for PCI assignment (aka "PCI passthrough"). Your L1 guest is > correctly binding the vNIC to virtio. > > > I'm trying to attach it inside a running guest, in short, I want to be able to pass a vNIC to a nested guest for development reasons > > This could be possible, but you'll need to give your L1 guest vIOMMU: > > <iommu model='intel'> > <driver intremap='on'/> > </iommu> > > https://libvirt.org/formatdomain.html#iommu-devices > > Then, to assign this L1 virtio vNIC to the L2 guest you can either do > <hostdev/> or <interface type='hostdev'/>: > > https://libvirt.org/formatdomain.html#pci-passthrough > thanks, after enabling the iommu in the guest, vfio-pci is attached to the nics. thanks for all the help Dagg
