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: <Z92XLufHveVjpI43@devvm6277.cco0.facebook.com>
Date: Fri, 21 Mar 2025 09:43:26 -0700
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Stefano Garzarella <sgarzare@...hat.com>
Cc: Paolo Abeni <pabeni@...hat.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 Fri, Mar 21, 2025 at 11:02:34AM +0100, Stefano Garzarella wrote:
> On Thu, Mar 20, 2025 at 02:05:38PM -0700, Bobby Eshleman wrote:
> > On Thu, Mar 20, 2025 at 10:08:02AM +0100, Stefano Garzarella wrote:
> > > 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).
> > > 
> > 
> > Maybe as a baseline we could follow the model of
> > tools/testing/selftests/bpf/vmtest.sh and start by reusing your
> > vsock_test parameters from your Ansible script?
> 
> Yeah, my playbooks are here:
> https://github.com/stefano-garzarella/ansible-vsock
> 
> Note: they are heavily customized on my env, I wrote some notes on how to
> change various wired path.
> 
> > 
> > I don't mind writing the patches.
> 
> That would be great and very much appreciated.
> Maybe you can do it in a separate series and then here add just the
> configuration we need.
> 
> Thanks,
> Stefano
> 

Sounds like a plan. Thanks!

Best,
Bobby