On Mon, Jun 18, 2018 at 10:50 AM, John Hubbard <jhubbard@xxxxxxxxxx> wrote: > On 06/18/2018 01:12 AM, Christoph Hellwig wrote: >> On Sun, Jun 17, 2018 at 01:28:18PM -0700, John Hubbard wrote: >>> Yes. However, my thinking was: get_user_pages() can become a way to indicate that >>> these pages are going to be treated specially. In particular, the caller >>> does not really want or need to support certain file operations, while the >>> page is flagged this way. >>> >>> If necessary, we could add a new API call. >> >> That API call is called get_user_pages_longterm. > > OK...I had the impression that this was just semi-temporary API for dax, but > given that it's an exported symbol, I guess it really is here to stay. The plan is to go back and provide api changes that bypass get_user_page_longterm() for RDMA. However, for VFIO and others, it's not clear what we could do. In the VFIO case the guest would need to be prepared handle the revocation.
