On Fri, Jun 26, 2020 at 09:47:25AM +0200, Christoph Hellwig wrote:

Note that this is somewhat urgent, as various of the APIs that the code
is abusing are slated to go away for Linux 5.9, so this addition comes
at a really bad time.

Could you elaborate on what is upcoming here?


Also, on a semi-related note, are there limitations on how many pages
can be left mapped by the iommu?  Some of the page pool work involves
leaving the pages mapped instead of constantly mapping/unmapping them.

On a heavily loaded box with iommu enabled, it seems that quite often
there is contention on the iova_lock.  Are there known issues in this
area?
-- 
Jonathan