linux-kernel - Re: [PATCH v2 3/3] vhost/vsock: use netns of process that opens the vhost-vsock-netns device

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Message-ID: <nwksousz7f4pkzwefvrpbgmmq6bt5kimv4icdkvm7n2nlom6yu@e62c5gdzmamg>
Date: Thu, 20 Mar 2025 10:08:02 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: Paolo Abeni <pabeni@...hat.com>
Cc: Bobby Eshleman <bobbyeshleman@...il.com>, 
	Jakub Kicinski <kuba@...nel.org>, "K. Y. Srinivasan" <kys@...rosoft.com>, 
	Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>, 
	Stefan Hajnoczi <stefanha@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>, 
	Jason Wang <jasowang@...hat.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	Eugenio Pérez <eperezma@...hat.com>, Bryan Tan <bryan-bt.tan@...adcom.com>, 
	Vishnu Dasa <vishnu.dasa@...adcom.com>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, "David S. Miller" <davem@...emloft.net>, 
	virtualization@...ts.linux.dev, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-hyperv@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 3/3] vhost/vsock: use netns of process that opens the
 vhost-vsock-netns device

On Wed, Mar 19, 2025 at 10:09:44PM +0100, Paolo Abeni wrote:
>On 3/12/25 9:59 PM, Bobby Eshleman wrote:
>> @@ -753,6 +783,8 @@ static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
>>  	virtio_vsock_skb_queue_purge(&vsock->send_pkt_queue);
>>
>>  	vhost_dev_cleanup(&vsock->dev);
>> +	if (vsock->net)
>> +		put_net(vsock->net);
>
>put_net() is a deprecated API, you should use put_net_track() instead.
>
>>  	kfree(vsock->dev.vqs);
>>  	vhost_vsock_free(vsock);
>>  	return 0;
>
>Also series introducing new features should also include the related
>self-tests.

Yes, I was thinking about testing as well, but to test this I think we 
need to run QEMU with Linux in it, is this feasible in self-tests?

We should start looking at that, because for now I have my own ansible 
script that runs tests (tools/testing/vsock/vsock_test) in nested VMs to 
test both host (vhost-vsock) and guest (virtio-vsock).

Thanks,
Stefano