On Wed, Jul 17, 2019 at 01:45:05PM -0700, Matthew Wilcox wrote: > On Wed, Jul 17, 2019 at 11:31:12PM +0300, Yuval Shaia wrote: > > On Wed, Jul 17, 2019 at 04:33:13PM -0300, Jason Gunthorpe wrote: > > > Like I said, drivers that require the creating ucontext as part of the > > > PD and MR cannot support sharing. > > > > Even if we can make sure the process that creates the MR stays alive until > > all reference to this MR completes? > > The kernel can't rely on userspace to do that. ok, how about this: we know that for MR to be shared the memory behinds it should also be shared. In this case, i know it sounds horrifying but do we care that the process that originally created this MR exits? i.e. how about just before the process leaves this world we will find some other ucontext to hold these memory mappings that driver holds? Or how about moving this mapping from ucontext pointed by ib_mr directly to ib_mr? Yuval
