From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932253AbcHDLqS (ORCPT ); Thu, 4 Aug 2016 07:46:18 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:11900 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752000AbcHDLqQ (ORCPT ); Thu, 4 Aug 2016 07:46:16 -0400 X-IBM-Helo: d06dlp03.portsmouth.uk.ibm.com X-IBM-MailFrom: rppt@linux.vnet.ibm.com X-IBM-RcptTo: linux-kernel@vger.kernel.org From: Mike Rapoport To: Andrea Arcangeli Cc: Hugh Dickins , Pavel Emelyanov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Mike Rapoport Subject: [PATCH 0/7] userfaultfd: add support for shared memory Date: Thu, 4 Aug 2016 11:14:11 +0300 X-Mailer: git-send-email 1.9.1 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16080408-0020-0000-0000-000001E25BDD X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16080408-0021-0000-0000-00001CFDBDE5 Message-Id: <1470298458-9925-1-git-send-email-rppt@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-08-04_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1604210000 definitions=main-1608040093 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org These patches enable userfaultfd support for shared memory mappings. The VMAs backed with shmem/tmpfs can be registered with userfaultfd which allows management of page faults in these areas by userland. This patch set adds implementation of shmem_mcopy_atomic_pte for proper handling of UFFDIO_COPY command. A callback to handle_userfault is added to shmem page fault handling path. The userfaultfd register/unregister methods are extended to allow shmem VMAs. The UFFDIO_ZEROPAGE and UFFDIO_REGISTER_MODE_WP are not implemented which is reflected by userfaultfd API handshake methods. The patches are based on current Andrea's tree: https://git.kernel.org/pub/scm/linux/kernel/git/andrea/aa.git Mike Rapoport (7): userfaultfd: introduce vma_can_userfault userfaultfd: shmem: add shmem_mcopy_atomic_pte for userfaultfd support userfaultfd: shmem: introduce vma_is_shmem userfaultfd: shmem: use shmem_mcopy_atomic_pte for shared memory userfaultfd: shmem: add userfaultfd hook for shared memory faults userfaultfd: shmem: allow registration of shared memory ranges userfaultfd: shmem: add userfaultfd_shmem test fs/userfaultfd.c | 32 ++++--- include/linux/mm.h | 10 +++ include/linux/shmem_fs.h | 11 +++ include/uapi/linux/userfaultfd.h | 2 +- mm/shmem.c | 139 +++++++++++++++++++++++++++++-- mm/userfaultfd.c | 31 ++++--- tools/testing/selftests/vm/Makefile | 3 + tools/testing/selftests/vm/run_vmtests | 11 +++ tools/testing/selftests/vm/userfaultfd.c | 39 ++++++++- 9 files changed, 237 insertions(+), 41 deletions(-) -- 1.9.1