Re: [PATCH v1] virtio-mmio: Specify wait needed in driver during reset

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Jul 26, 2021 at 01:36:56PM +0200, Cornelia Huck wrote:
> On Mon, Jul 26 2021, Srivatsa Vaddagiri <svaddagi@qti.qualcomm.com> wrote:
> 
> >> > +indicated by a read of \field{Status} returning 0. Such a device MUST also
> >> > fail to accept
> >> > +FEATURES_OK bit if driver does not negotiate VIRTIO_F_MMIO_RESET_WAIT.
> >>
> >> So, this basically means that an older driver that does not know the new
> >> feature bit will not work with devices offering this bit, even if it did
> >> poll? This seems acceptable, I just wanted to spell it out.
> >
> > Yes I believe that's the desired result. Device has no way to know if driver
> > will poll for reset completion or not unless it accepts the feature.
> > Are you suggesting we explicitly put in some text in spec to that
> > effect?
> 
> Not sure whether it is needed (do others have an opinion?), but probably
> not.

What about resets before FEATURES_OK? How are these handled?

-- 
MST