> From: Liu, Yi L <yi.l.liu@xxxxxxxxx> > Sent: Monday, July 24, 2023 7:04 PM > > Nested translation has stage-1 and stage-2 page tables. A stage-1 page > table is managed by user space, and it needs to work with a stage-2 page > table, which is a parent hwpt for the stage-1 hwpt. > > iommu core already supports accepting parent iommu_domain and > user_data > to allocate an iommu_domain. This makes iommufd_hw_pagetable_alloc() > to > accept the parent hwpt and user_data, and relays them to iommu core, to > prepare for supporting hw_pagetable allocation with user_data. > > Also, add a parent pointer in struct iommufd_hw_pagetable for taking and > releasing its refcount. > > Co-developed-by: Nicolin Chen <nicolinc@xxxxxxxxxx> > Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx> > Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
