Re: [PATCH v4 1/4] virtio:add support in configure interrupt

[Jason Wang]

在 2021/3/25 下午3:15, Cindy Lu 写道:

> > > +enum virtio_config_status {
> > > +    VIRTIO_CONFIG_SUPPORT,
> > > +    VIRTIO_CONFIG_WORK,
> > > +    VIRTIO_CONFIG_STOP,
> > > +    VIRTIO_CONFIG_STATUS_UNKNOWN,
> > >         
> > Any reason for this extra state? I think we can know whether the config
> > interrupt is being used through a
> >
> > Thanks
> >
> >       
> The problem is I need to split the backend devices into 3 types,
> 1） normal device
> 2）vdpa support config interrupt. and the configur interrupt is active now
> 3）vdpa not support config interrupt.
> So I  add this bit and this bit will init in vpda /vhost modules and
> qemu can check this bit to know the  which behariver we will do in
> virtio bus  and other modules,
>

I wonder whether it's a must. We can setup guest notifiers unconditionally, so if it's an vhost bakcend without config interrupt support, such notifiers won't be used.

Thanks

>  Maybe I need to change this bit's name
> to make it more clearly
>
> Thanks
> Cindy
>