> >uverbs is trickier, because a userspace process will typically have some > >hardware resources directly mmap'ed. We need a way to "revoke" that > >mmap and have it point at a dummy page until userspace releases it --
> What exactly would the dummy page contain and could the application/library > read > it assuming that it is obtaining valid data? It would be an all-0s page I guess (to avoid leaking kernel data). What the device driver library would do with it is device-specific but eg Mellanox uses it write-only. Not sure if any other devices put something readable there -- if so I guess that driver should put a safe value there if possible. -- Roland Dreier <[email protected]> For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/index.html -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
