On Mon, Mar 16, 2020 at 03:17:07PM -0300, Jason Gunthorpe wrote: > On Mon, Mar 16, 2020 at 06:52:58PM +0100, Christoph Hellwig wrote: > > Add a new opaque owner field to struct dev_pagemap, which will allow > > the hmm and migrate_vma code to identify who owns ZONE_DEVICE memory, > > and refuse to work on mappings not owned by the calling entity. > > Using a pointer seems like a good solution to me. > > Is this a bug fix? What is the downside for migrate on pages it > doesn't work? I'm not up to speed on migrate.. migrating private pages not owned by driver simply won't work, as the device can't access it. Even inside the same driver say GPU A can't just migrate CPU B's memory. In that sense it is a bug fix for the rather unlikely case of using the experimental nouveau with multiple GPUs, or in a power secure VM (if that is even possible). _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
