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| author |   Cornelia Huck <cohuck@redhat.com> | 2019-01-08 15:53:03 +0100 |
|---|---|---|
| committer | Cornelia Huck <cohuck@redhat.com> | 2019-04-24 14:18:51 +0200 |
| commit | 4f76617378ee97c557b526cb58d3c61eb0a9c963 (patch) | |
| tree | 42e9ac6864535d6d1ea1210790dfccf072eb73bb /drivers/s390/cio/vfio_ccw_private.h | |
| parent | vfio-ccw: rework ssch state handling (diff) | |
| download | linux-dev-4f76617378ee97c557b526cb58d3c61eb0a9c963.tar.xz linux-dev-4f76617378ee97c557b526cb58d3c61eb0a9c963.zip | |
vfio-ccw: protect the I/O region
Introduce a mutex to disallow concurrent reads or writes to the
I/O region. This makes sure that the data the kernel or user
space see is always consistent.
The same mutex will be used to protect the async region as well.
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/s390/cio/vfio_ccw_private.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h index 50c52efb4fcb..32173cbd838d 100644 --- a/drivers/s390/cio/vfio_ccw_private.h +++ b/drivers/s390/cio/vfio_ccw_private.h @@ -28,6 +28,7 @@ * @mdev: pointer to the mediated device * @nb: notifier for vfio events * @io_region: MMIO region to input/output I/O arguments/results + * @io_mutex: protect against concurrent update of I/O regions * @cp: channel program for the current I/O operation * @irb: irb info received from interrupt * @scsw: scsw info @@ -42,6 +43,7 @@ struct vfio_ccw_private { struct mdev_device *mdev; struct notifier_block nb; struct ccw_io_region *io_region; + struct mutex io_mutex; struct channel_program cp; struct irb irb; |