On Thu, 16 Sep 2021 16:20:50 -0500 Mike Christie wrote:
>
> static int vhost_worker_create(struct vhost_dev *dev)
> {
> + DECLARE_COMPLETION_ONSTACK(start_done);
Nit, cut it.
> struct vhost_worker *worker;
> struct task_struct *task;
> + char buf[TASK_COMM_LEN];
> int ret;
>
> worker = kzalloc(sizeof(*worker), GFP_KERNEL_ACCOUNT);
> @@ -603,27 +613,30 @@ static int vhost_worker_create(struct vhost_dev *dev)
> return -ENOMEM;
>
> dev->worker = worker;
> - worker->dev = dev;
> worker->kcov_handle = kcov_common_handle();
> init_llist_head(&worker->work_list);
>
> - task = kthread_create(vhost_worker, worker, "vhost-%d", current->pid);
> - if (IS_ERR(task)) {
> - ret = PTR_ERR(task);
> + /*
> + * vhost used to use the kthread API which ignores all signals by
> + * default and the drivers expect this behavior. So we do not want to
> + * ineherit the parent's signal handlers and set our worker to ignore
> + * everything below.
> + */
> + task = kernel_copy_process(vhost_worker, worker, NUMA_NO_NODE,
> + CLONE_FS|CLONE_CLEAR_SIGHAND, 0, 1);
> + if (IS_ERR(task))
> goto free_worker;
> - }
>
> worker->task = task;
> - wake_up_process(task); /* avoid contributing to loadavg */
>
> - ret = vhost_attach_cgroups(dev);
> - if (ret)
> - goto stop_worker;
> + snprintf(buf, sizeof(buf), "vhost-%d", current->pid);
> + set_task_comm(task, buf);
> +
> + ignore_signals(task);
>
> + wake_up_new_task(task);
> return 0;
>
> -stop_worker:
> - kthread_stop(worker->task);
> free_worker:
> kfree(worker);
> dev->worker = NULL;
> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> index 102ce25e4e13..09748694cb66 100644
> --- a/drivers/vhost/vhost.h
> +++ b/drivers/vhost/vhost.h
> @@ -25,11 +25,16 @@ struct vhost_work {
> unsigned long flags;
> };
>
> +enum {
> + VHOST_WORKER_FLAG_STOP,
> +};
> +
> struct vhost_worker {
> struct task_struct *task;
> + struct completion *exit_done;
> struct llist_head work_list;
> - struct vhost_dev *dev;
> u64 kcov_handle;
> + unsigned long flags;
> };
>
> /* Poll a file (eventfd or socket) */
> --
> 2.25.1
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