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SubjectRe: [PATCH v7 04/15] s390/vfio-ap: implement in-use callback for vfio_ap driver
On Tue,  7 Apr 2020 15:20:04 -0400
Tony Krowiak <akrowiak@linux.ibm.com> wrote:

> Let's implement the callback to indicate when an APQN
> is in use by the vfio_ap device driver. The callback is
> invoked whenever a change to the apmask or aqmask would
> result in one or more queue devices being removed from the driver. The
> vfio_ap device driver will indicate a resource is in use
> if the APQN of any of the queue devices to be removed are assigned to
> any of the matrix mdevs under the driver's control.
>
> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
> ---
> drivers/s390/crypto/vfio_ap_drv.c | 1 +
> drivers/s390/crypto/vfio_ap_ops.c | 47 +++++++++++++++++----------
> drivers/s390/crypto/vfio_ap_private.h | 2 ++
> 3 files changed, 33 insertions(+), 17 deletions(-)

> @@ -1369,3 +1371,14 @@ void vfio_ap_mdev_remove_queue(struct ap_queue *queue)
> kfree(q);
> mutex_unlock(&matrix_dev->lock);
> }
> +
> +bool vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm)
> +{
> + bool in_use;
> +
> + mutex_lock(&matrix_dev->lock);
> + in_use = vfio_ap_mdev_verify_no_sharing(NULL, apm, aqm) ? true : false;

Maybe

in_use = !!vfio_ap_mdev_verify_no_sharing(NULL, apm, aqm);

?

> + mutex_unlock(&matrix_dev->lock);
> +
> + return in_use;
> +}

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