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Message-ID: <6dc937e4-0ef9-617d-c9c8-8b1f8c428d90@redhat.com>
Date: Wed, 29 Apr 2020 17:21:42 +0800
From: Jason Wang <jasowang@...hat.com>
To: Stefano Garzarella <sgarzare@...hat.com>
Cc: davem@...emloft.net, Stefan Hajnoczi <stefanha@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
linux-kernel@...r.kernel.org, Jorgen Hansen <jhansen@...are.com>,
kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
linux-hyperv@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/3] vsock: support network namespace
On 2020/4/29 上午12:00, Stefano Garzarella wrote:
> On Tue, Apr 28, 2020 at 04:13:22PM +0800, Jason Wang wrote:
>> On 2020/4/27 下午10:25, Stefano Garzarella wrote:
>>> Hi David, Michael, Stefan,
>>> I'm restarting to work on this topic since Kata guys are interested to
>>> have that, especially on the guest side.
>>>
>>> While working on the v2 I had few doubts, and I'd like to have your
>>> suggestions:
>>>
>>> 1. netns assigned to the device inside the guest
>>>
>>> Currently I assigned this device to 'init_net'. Maybe it is better
>>> if we allow the user to decide which netns assign to the device
>>> or to disable this new feature to have the same behavior as before
>>> (host reachable from any netns).
>>> I think we can handle this in the vsock core and not in the single
>>> transports.
>>>
>>> The simplest way that I found, is to add a new
>>> IOCTL_VM_SOCKETS_ASSIGN_G2H_NETNS to /dev/vsock to enable the feature
>>> and assign the device to the same netns of the process that do the
>>> ioctl(), but I'm not sure it is clean enough.
>>>
>>> Maybe it is better to add new rtnetlink messages, but I'm not sure if
>>> it is feasible since we don't have a netdev device.
>>>
>>> What do you suggest?
>> As we've discussed, it should be a netdev probably in either guest or host
>> side. And it would be much simpler if we want do implement namespace then.
>> No new API is needed.
>>
> Thanks Jason!
>
> It would be cool, but I don't have much experience on netdev.
> Do you see any particular obstacles?
I don't see but if there's we can try to find a solution or ask for
netdev experts for that. I do hear from somebody that is interested in
having netdev in the past.
>
> I'll take a look to understand how to do it, surely in the guest would
> be very useful to have the vsock device as a netdev and maybe also in the host.
Yes, it's worth to have a try then we will have a unified management
interface and we will benefit from it in the future.
Starting form guest is good idea which should be less complicated than host.
Thanks
>
> Stefano
>
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