On Wed, Feb 15, 2023 at 02:57:26PM -0600, Bjorn Helgaas wrote: > [+cc Will, Robin, Joerg for arm-smmu-v3 page size question] > > On Sun, Feb 12, 2023 at 08:14:48PM +0200, Leon Romanovsky wrote: > > On Wed, Feb 08, 2023 at 10:43:21AM -0800, Ganapatrao Kulkarni wrote: > > > As per PCIe specification(section 10.5), If a VF implements an > > > ATS capability, its associated PF must implement an ATS capability. > > > The ATS Capabilities in VFs and their associated PFs are permitted to > > > be enabled independently. Well, the spec is one thing, existing hardware the other. Have you checked the history of the PF-before-VF requirement before making that change? It is possible that early PASID-capable hardware actually required PF-before-VF enablement of ATS. Regards, Joerg
