userfaultfd: non-cooperative: add ability to report non-PF events from uffd descriptor
The custom events are queued in ctx->event_wqh not to disturb the fast-path-ed PF queue-wait-wakeup functions. The events to be generated (other than PF-s) are requested in UFFD_API ioctl with the uffd_api.features bits. Those, known by the kernel, are then turned on and reported back to the user-space. Link: http://lkml.kernel.org/r/20161216144821.5183-7-aarcange@redhat.com Signed-off-by:Pavel Emelyanov <xemul@parallels.com> Signed-off-by:
Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by:
Andrea Arcangeli <aarcange@redhat.com> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Michael Rapoport <RAPOPORT@il.ibm.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
parent
6dcc27fd
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