On Mon, Feb 07 2022 at 15:02, Fenghua Yu wrote: > PASIDs are process wide. It was attempted to use refcounted PASIDs to > free them when the last thread drops the refcount. This turned out to > be complex and error prone. Given the fact that the PASID space is 20 > bits, which allows up to 1M processes to have a PASID associated > concurrently, PASID resource exhaustion is not a realistic concern. > > Therefore it was decided to simplify the approach and stick with lazy > on demand PASID allocation, but drop the eager free approach and make > a allocated PASID lifetime bound to the life time of the process. > > Get rid of the refcounting mechanisms and replace/rename the interfaces > to reflect this new approach. > > Suggested-by: Dave Hansen <[email protected]> > Signed-off-by: Fenghua Yu <[email protected]> > Reviewed-by: Tony Luck <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]> _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
