Re: [Qemu-devel] [PATCH v6 1/2] virtio-crypto: Add virtio crypto device specification

[Michael S. Tsirkin]

On Thu, Aug 04, 2016 at 11:24:26AM +0000, Gonglei (Arei) wrote:
> > > +The first driver-read-only field, \field{version} specifies the virtio 
> > > crypto's
> > > +version, which is reserved for back-compatibility in future.It's 
> > > currently
> > > +defined for the version field:
> > > +
> > > +\begin{lstlisting}
> > > +#define VIRTIO_CRYPTO_VERSION_1  (1)
> > 
> > Suggest to remove this macro,
> > Do you think a version which is composed of major version and
> > minor version is better?
> > 
> 
> I think we should tell the developer how to set the value of version field,
> but I have no idea about which value or form is better, so I used 1 as the
> first version. What's your opinion?

My opinion is that you should drop this completely. We do feature bits,
not version numbers in virtio. We do not want each device doing its own
thing for compatibility.

-- 
MST