On Tue, May 09, 2023 at 08:34:53AM +0000, Tian, Kevin wrote: > According to PCIe spec (7.8.9 PASID Extended Capability Structure): > > The PASID configuration of the single non-VF Function representing > the device is also used by all VFs in the device. A PF is permitted > to implement the PASID capability, but VFs must not implement it. > > To enable PASID on VF then one open is where to locate the PASID > capability in VF's vconfig space. vfio-pci doesn't know which offset > may contain VF specific config registers. Finding such offset must > come from a device specific knowledge. Why? Can't vfio probe the cap tree and just find a gap to insert a new cap? We already mangle the cap list, I'm not sure I see what the problem is? Jason
