From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Williamson Subject: [PATCH v4 0/2] vfio/mdev: Device namespace protection Date: Fri, 18 May 2018 13:10:16 -0600 Message-ID: <20180518190145.3187.7620.stgit@gimli.home> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, alex.williamson@redhat.com, cohuck@redhat.com, pasic@linux.ibm.com To: kwankhede@nvidia.com Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org v4: Fix the 'create' racing 'remove' gap noted by Kirti by moving removal from mdev_list to mdev_device_release(). Fix missing mdev_put_parent() cases in mdev_device_create(), also noted by Kirti. Added documention update regarding serialization as noted by Cornelia. Added additional commit log comment about -EAGAIN vs -ENODEV for 'remove' racing 'create'. Added second patch to re-order sysfs attributes, with this my targeted scripts can no longer hit the gap where -EAGAIN is regurned. BTW, the gap where the current code returns -ENODEV in this race condition is about 50% easier to hit than it exists in this series with patch 1 alone. Thanks, Alex --- Alex Williamson (2): vfio/mdev: Check globally for duplicate devices vfio/mdev: Re-order sysfs attribute creation Documentation/vfio-mediated-device.txt | 5 ++ drivers/vfio/mdev/mdev_core.c | 102 +++++++++++--------------------- drivers/vfio/mdev/mdev_private.h | 2 - drivers/vfio/mdev/mdev_sysfs.c | 14 ++-- 4 files changed, 49 insertions(+), 74 deletions(-)