[RFC PATCH 11/15] drivers/acrn: add the support of handling emulated ioreq

Dan Carpenter dan.carpenter at oracle.com
Fri Aug 16 13:39:46 UTC 2019


On Fri, Aug 16, 2019 at 10:25:52AM +0800, Zhao Yakui wrote:
> +int acrn_ioreq_create_client(unsigned short vmid,
> +			     ioreq_handler_t handler,
> +			     void *client_priv,
> +			     char *name)
> +{
> +	struct acrn_vm *vm;
> +	struct ioreq_client *client;
> +	int client_id;
> +
> +	might_sleep();
> +
> +	vm = find_get_vm(vmid);
> +	if (unlikely(!vm || !vm->req_buf)) {
> +		pr_err("acrn-ioreq: failed to find vm from vmid %d\n", vmid);
> +		put_vm(vm);
> +		return -EINVAL;
> +	}
> +
> +	client_id = alloc_client();
> +	if (unlikely(client_id < 0)) {
> +		pr_err("acrn-ioreq: vm[%d] failed to alloc ioreq client\n",
> +		       vmid);
> +		put_vm(vm);
> +		return -EINVAL;
> +	}
> +
> +	client = acrn_ioreq_get_client(client_id);
> +	if (unlikely(!client)) {
> +		pr_err("failed to get the client.\n");
> +		put_vm(vm);
> +		return -EINVAL;

Do we need to clean up the alloc_client() allocation?

regards,
dan carpenter

> +	}
> +
> +	if (handler) {
> +		client->handler = handler;
> +		client->acrn_create_kthread = true;
> +	}
> +
> +	client->ref_vm = vm;
> +	client->vmid = vmid;
> +	client->client_priv = client_priv;
> +	if (name)
> +		strncpy(client->name, name, sizeof(client->name) - 1);
> +	rwlock_init(&client->range_lock);
> +	INIT_LIST_HEAD(&client->range_list);
> +	init_waitqueue_head(&client->wq);
> +
> +	/* When it is added to ioreq_client_list, the refcnt is increased */
> +	spin_lock_bh(&vm->ioreq_client_lock);
> +	list_add(&client->list, &vm->ioreq_client_list);
> +	spin_unlock_bh(&vm->ioreq_client_lock);
> +
> +	pr_info("acrn-ioreq: created ioreq client %d\n", client_id);
> +
> +	return client_id;
> +}



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