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

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Message-ID: <2cb44337-eea6-5953-3df9-b53f3f6e3301@nvidia.com>
Date:   Sat, 19 May 2018 01:07:33 +0530
From:   Kirti Wankhede <kwankhede@...dia.com>
To:     Alex Williamson <alex.williamson@...hat.com>
CC:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <cohuck@...hat.com>, <pasic@...ux.ibm.com>
Subject: Re: [PATCH v4 0/2] vfio/mdev: Device namespace protection



On 5/19/2018 12:40 AM, Alex Williamson wrote:
> 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 for fixing this. This patch set looks good to me.

Thanks,
Kirti

> 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(-)
>