Commit bd50c5dc authored by Stefano Garzarella's avatar Stefano Garzarella Committed by Jakub Kicinski
Browse files

vsock/virtio: add support for device suspend/resume 



Implement .freeze and .restore callbacks of struct virtio_driver
to support device suspend/resume.

During suspension all connected sockets are reset and VQs deleted.
During resume the VQs are re-initialized.

Reported by: Vilas R K <vilas.r.k@intel.com>
Signed-off-by: default avatarStefano Garzarella <sgarzare@redhat.com>
Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent a1032098

net/vmw_vsock/virtio_transport.c

+47 −0
Original line number Diff line number Diff line
@@ -743,6 +743,49 @@ static void virtio_vsock_remove(struct virtio_device *vdev) 
	kfree(vsock);

}



#ifdef CONFIG_PM_SLEEP

static int virtio_vsock_freeze(struct virtio_device *vdev)

{

	struct virtio_vsock *vsock = vdev->priv;



	mutex_lock(&the_virtio_vsock_mutex);



	rcu_assign_pointer(the_virtio_vsock, NULL);

	synchronize_rcu();



	virtio_vsock_vqs_del(vsock);



	mutex_unlock(&the_virtio_vsock_mutex);



	return 0;

}



static int virtio_vsock_restore(struct virtio_device *vdev)

{

	struct virtio_vsock *vsock = vdev->priv;

	int ret;



	mutex_lock(&the_virtio_vsock_mutex);



	/* Only one virtio-vsock device per guest is supported */

	if (rcu_dereference_protected(the_virtio_vsock,

				lockdep_is_held(&the_virtio_vsock_mutex))) {

		ret = -EBUSY;

		goto out;

	}



	ret = virtio_vsock_vqs_init(vsock);

	if (ret < 0)

		goto out;



	rcu_assign_pointer(the_virtio_vsock, vsock);



out:

	mutex_unlock(&the_virtio_vsock_mutex);

	return ret;

}

#endif /* CONFIG_PM_SLEEP */



static struct virtio_device_id id_table[] = {

	{ VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID },

	{ 0 },
@@ -760,6 +803,10 @@ static struct virtio_driver virtio_vsock_driver = { 
	.id_table = id_table,

	.probe = virtio_vsock_probe,

	.remove = virtio_vsock_remove,

#ifdef CONFIG_PM_SLEEP

	.freeze = virtio_vsock_freeze,

	.restore = virtio_vsock_restore,

#endif

};



static int __init virtio_vsock_init(void)