On Fri, 21 Aug 2020 15:56:05 -0400 Tony Krowiak <akrow...@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 <akrow...@linux.ibm.com> > --- > drivers/s390/crypto/vfio_ap_drv.c | 1 + > drivers/s390/crypto/vfio_ap_ops.c | 68 ++++++++++++++++++++------- > drivers/s390/crypto/vfio_ap_private.h | 2 + > 3 files changed, 53 insertions(+), 18 deletions(-) > > diff --git a/drivers/s390/crypto/vfio_ap_drv.c > b/drivers/s390/crypto/vfio_ap_drv.c > index 24cdef60039a..aae5b3d8e3fa 100644 > --- a/drivers/s390/crypto/vfio_ap_drv.c > +++ b/drivers/s390/crypto/vfio_ap_drv.c > @@ -175,6 +175,7 @@ static int __init vfio_ap_init(void) > memset(&vfio_ap_drv, 0, sizeof(vfio_ap_drv)); > vfio_ap_drv.probe = vfio_ap_queue_dev_probe; > vfio_ap_drv.remove = vfio_ap_queue_dev_remove; > + vfio_ap_drv.in_use = vfio_ap_mdev_resource_in_use; > vfio_ap_drv.ids = ap_queue_ids; > > ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME); > diff --git a/drivers/s390/crypto/vfio_ap_ops.c > b/drivers/s390/crypto/vfio_ap_ops.c > index 2e37ee82e422..fc1aa6f947eb 100644 > --- a/drivers/s390/crypto/vfio_ap_ops.c > +++ b/drivers/s390/crypto/vfio_ap_ops.c > @@ -515,18 +515,36 @@ vfio_ap_mdev_verify_queues_reserved_for_apid(struct > ap_matrix_mdev *matrix_mdev, > return 0; > } > > +#define MDEV_SHARING_ERR "Userspace may not re-assign queue %02lx.%04lx " \ > + "already assigned to %s" Ah, I spoke too soon; this is what I had been looking for :)
