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s390/vfio-ap: wire in the vfio_device_ops request callback

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The mdev device is being removed, so pass the request to userspace to
ask for a graceful cleanup. This should free up the thread that
would otherwise loop waiting for the device to be fully released.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Link: https://lore.kernel.org/r/20230530223538.279198-4-akrowiak@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Tony Krowiak 2023-05-30 18:35:38 -04:00 committed by Alexander Gordeev
parent bf48961f6f
commit 2e3d8d71e2
1 changed files with 21 additions and 0 deletions
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21
drivers/s390/crypto/vfio_ap_ops.c
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@ -1736,6 +1736,26 @@ static void vfio_ap_mdev_close_device(struct vfio_device *vdev)
vfio_ap_mdev_unset_kvm(matrix_mdev);
}
static void vfio_ap_mdev_request(struct vfio_device *vdev, unsigned int count)
{
struct device *dev = vdev->dev;
struct ap_matrix_mdev *matrix_mdev;
matrix_mdev = container_of(vdev, struct ap_matrix_mdev, vdev);
if (matrix_mdev->req_trigger) {
if (!(count % 10))
dev_notice_ratelimited(dev,
"Relaying device request to user (#%u)\n",
count);
eventfd_signal(matrix_mdev->req_trigger, 1);
} else if (count == 0) {
dev_notice(dev,
"No device request registered, blocked until released by user\n");
}
}
static int vfio_ap_mdev_get_device_info(unsigned long arg)
{
unsigned long minsz;
@ -1955,6 +1975,7 @@ static const struct vfio_device_ops vfio_ap_matrix_dev_ops = {
.bind_iommufd = vfio_iommufd_emulated_bind,
.unbind_iommufd = vfio_iommufd_emulated_unbind,
.attach_ioas = vfio_iommufd_emulated_attach_ioas,
.request = vfio_ap_mdev_request
};
static struct mdev_driver vfio_ap_matrix_driver = {