On Wed, Mar 15, 2023 at 06:15:02AM +0000, Liu, Yi L wrote: > > > +void vfio_iommufd_emulated_detach_ioas(struct vfio_device *vdev) > > > +{ > > > + lockdep_assert_held(&vdev->dev_set->lock); > > > + > > > + if (WARN_ON(!vdev->iommufd_access)) > > > + return; > > > + > > [...] > > > + iommufd_access_destroy(vdev->iommufd_access); > > > + vdev->iommufd_access = NULL; > > > > After moving access allocation/destroy to bind/unbind, here it > > should be: > > iommufd_access_set_ioas(vdev->iommufd_access, 0); > > You are right. Yet...iommufd_access_set_ioas is getting reworked with my patch: In another thread, Jason suggested to have iommufd_acces_detach API, and I am trying to finalize it with Jason/Kevin. https://lore.kernel.org/kvm/BN9PR11MB5276738DC59AC1B4A66AB3C38CBF9@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ Nic