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vsock/virtio: add support for device suspend/resume

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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: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stefano Garzarella 2022-04-28 15:22:41 +02:00 committed by Jakub Kicinski
parent a103209886
commit bd50c5dc18
1 changed files with 47 additions and 0 deletions
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47
net/vmw_vsock/virtio_transport.c
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@ -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)