netdev - Re: [PATCH 3/5] vDPA: introduce vDPA bus

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Date:   Tue, 21 Jan 2020 09:15:14 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "tiwei.bie@...el.com" <tiwei.bie@...el.com>,
        "maxime.coquelin@...hat.com" <maxime.coquelin@...hat.com>,
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        "zhihong.wang@...el.com" <zhihong.wang@...el.com>,
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        Parav Pandit <parav@...lanox.com>,
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        Jiri Pirko <jiri@...lanox.com>,
        Shahaf Shuler <shahafs@...lanox.com>,
        "hanand@...inx.com" <hanand@...inx.com>,
        "mhabets@...arflare.com" <mhabets@...arflare.com>
Subject: Re: [PATCH 3/5] vDPA: introduce vDPA bus

On Tue, Jan 21, 2020 at 02:12:05PM +0000, Jason Gunthorpe wrote:
> On Mon, Jan 20, 2020 at 04:56:06PM -0500, Michael S. Tsirkin wrote:
> > > For vfio? vfio is the only thing I am aware doing
> > > that, and this is not vfio..
> > 
> > vfio is not doing anything. anyone can use a combination
> > of unbind and driver_override to attach a driver to a device.
> > 
> > It's not a great interface but it's there without any code,
> > and it will stay there without maintainance overhead
> > if we later add a nicer one.
> 
> Well, it is not a great interface, and it is only really used in
> normal cases by vfio.
> 
> I don't think it is a good idea to design new subsystems with that
> idea in mind, particularly since detatching the vdpa driver would not
> trigger destruction of the underlying dynamic resource (ie the SF).
> 
> We need a way to trigger that destruction..
> 
> Jason 

You wanted a netlink command for this, right?

-- 
MST