linux-kernel - Re: [PATCH net-next 1/3] vsock: add network namespace support

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Message-ID: <Z8ixzohy9a0b9QZ2@devvm6277.cco0.facebook.com>
Date: Wed, 5 Mar 2025 12:19:26 -0800
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Stefano Garzarella <sgarzare@...hat.com>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jorgen Hansen <jhansen@...are.com>,
	Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org,
	Stefan Hajnoczi <stefanha@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	linux-hyperv@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>
Subject: Re: [PATCH net-next 1/3] vsock: add network namespace support

On Wed, Mar 05, 2025 at 05:07:13PM +0100, Stefano Garzarella wrote:
> On Wed, 5 Mar 2025 at 16:55, Bobby Eshleman <bobbyeshleman@...il.com> wrote:
> >
> > Do you know of any use cases for guest-side vsock netns?
> 
> Yep, as I mentioned in another mail this morning, the use case is
> nested VMs or containers running in the L1 guests.
> Users (e.g. Kata) would like to hide the L0<->L1 vsock channel in the
> container, so anything running there can't talk with the L0 host.
> 
> BTW we can do that incrementally if it's too complicated.
> 

Got it! I will try your solution with /dev/vsock-netns (unless there are
strong feelings otherwise), and if it becomes hairy maybe I'll omit it
in the next rev.

I don't think my earlier concern about port collissions in the G2H
scenario is worth worrying about without a real use case, that doesn't
sound expected by any users right now.

Thanks,
Bobby