RE: [PATCH v3 04/12] iommufd: Move ioas related HWPT destruction into iommufd_hw_pagetable_destroy()

From: Jason Gunthorpe jgg@nvidia.com Sent: Thursday, March 2, 2023 3:30 AM

A HWPT is permanently associated with an IOAS when it is created, remove the strange situation where a refcount != 0 HWPT can have been disconnected from the IOAS by putting all the IOAS related destruction in the object destroy function.

Initializing a HWPT is two stages, we have to allocate it, attach it to a device and then populate the domain. Once the domain is populated it is fully linked to the IOAS.

Arrange things so that all the error unwinds flow through the iommufd_hw_pagetable_destroy() and allow it to handle all cases.

Signed-off-by: Jason Gunthorpe jgg@nvidia.com

Reviewed-by: Kevin Tian kevin.tian@intel.com