userfaultfd: shmem: allow registration of shared memory ranges
authorMike Rapoport <rppt@linux.vnet.ibm.com>
Wed, 22 Feb 2017 23:43:40 +0000 (15:43 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 23 Feb 2017 00:41:28 +0000 (16:41 -0800)
commitcac673292b9b39493bb0ff526b96c83ace6fdcd0
tree7d8dbcd6cabcdf35cc2866b672c65be98cc1e5be
parentcfda05267f7bd02b5ae5ac6a37fbbdf3b9c41b57
userfaultfd: shmem: allow registration of shared memory ranges

Expand the userfaultfd_register/unregister routines to allow shared
memory VMAs.

Currently, there is no UFFDIO_ZEROPAGE and write-protection support for
shared memory VMAs, which is reflected in ioctl methods supported by
uffdio_register.

Link: http://lkml.kernel.org/r/20161216144821.5183-34-aarcange@redhat.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>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/userfaultfd.c
include/uapi/linux/userfaultfd.h
tools/testing/selftests/vm/userfaultfd.c