> From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> > Sent: Monday, May 27, 2024 12:05 PM > > When allocating a user iommufd_hw_pagetable, the user space is allowed to > associate a fault object with the hw_pagetable by specifying the fault > object ID in the page table allocation data and setting the > IOMMU_HWPT_FAULT_ID_VALID flag bit. > > On a successful return of hwpt allocation, the user can retrieve and > respond to page faults by reading and writing the file interface of the > fault object. > > Once a fault object has been associated with a hwpt, the hwpt is > iopf-capable, indicated by hwpt->fault is non NULL. Attaching, > detaching, or replacing an iopf-capable hwpt to an RID or PASID will > differ from those that are not iopf-capable. > > Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
