On Wed, May 10, 2023 at 02:16:05AM +0000, Tian, Kevin wrote: > We don't have a control knob to hide/unhide a specific PCI cap > today. It's hardcoded with proper virtualization policy in vfio-pci. > > Following current convention once vfio-pci adds the support for the > PASID cap it will be exposed if present (for VF it's the presence in PF). We probably shouldn't do this - the PASID cap should only exist if the VMM is actualy able to handle PASID throughout, and currently no VMM does this. So we can't just have the kernel unconditionally add the cap. There needs to be a negotiation with the VMM Jason
