linux-kernel - [PATCH v4 0/2] vfio/mdev: Device namespace protection

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Date:   Fri, 18 May 2018 13:10:16 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     kwankhede@...dia.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        alex.williamson@...hat.com, cohuck@...hat.com, pasic@...ux.ibm.com
Subject: [PATCH v4 0/2] vfio/mdev: Device namespace protection

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(-)