[PATCH V2 6/8] mdev: introduce virtio device and its device ops

[Michael S. Tsirkin]

On Thu, Sep 26, 2019 at 06:48:54PM +0800, Jason Wang wrote:
> 
> On 2019/9/26 下午4:21, Michael S. Tsirkin wrote:
> > On Thu, Sep 26, 2019 at 12:04:46PM +0800, Jason Wang wrote:
> > > > > > I'm not sure how stable above ops are.
> > > > > It's the kernel internal API, so there's no strict requirement for this. We
> > > > > will export a version value for userspace for compatibility.
> > > > Given it's tied to virtio we probably want kernel+userspace
> > > > feature bits?
> > > 
> > > Yes, then I think we could probably have a version field inside e.g
> > > device_ops structure. Then it could be fetched from both kernel and
> > > userspace driver.
> > > 
> > > Thanks
> > > 
> > 
> > my point was feature bits not a version number.
> 
> 
> Something like backend_feature that current vhost_net did?
> 
> Thanks
> 
> 
> > 

right