On Mon, Jan 24, 2022 at 09:58:18AM +0000, Tian, Kevin wrote: > > From: Lu Baolu <baolu...@linux.intel.com> > > Sent: Monday, January 24, 2022 3:11 PM > > +/** > > + * struct domain_ops - per-domain ops > > + * @attach_dev: attach an iommu domain to a device > > + * @detach_dev: detach an iommu domain from a device > > What is the criteria about whether an op should be iommu_ops or domain_ops > when it requires both domain and device pointers like above two (and future > PASID-based attach)? > > Other examples include: > @apply_resv_region > @is_attach_deferred
Could attach_dev() be an IOMMU op? So a driver could set the domain ops in attach_dev() rather than domain_alloc(). That would allow to install map()/unmap() ops that are tailored for the device's IOMMU, which we don't know at domain_alloc() time. I'm thinking about a guest that has both physical and virtual endpoints, which would ideally use different kinds of domain ops to support both efficiently (caching mode vs page tables) Thanks, Jean _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu