On Fri, Feb 01, 2019 at 10:09:08AM +0100, Stefano Garzarella wrote:
> On Fri, Feb 01, 2019 at 12:29:28PM +0800, Stefan Hajnoczi wrote:
> > On Thu, Jan 31, 2019 at 04:19:11PM +0100, Stefano Garzarella wrote:
> > > In order to avoid migration issues, we enable DISCARD and
> > > WRITE ZEROES features only for machine type >= 4.0
> > 
> > Please use two separate properties that correspond to the
> > VIRTIO_BLK_F_DISCARD and VIRTIO_BLK_F_WRITE_ZEROES virtio-blk feature
> > bits.
> 
> Okay.
> As Michael suggested, what do you think if I use a similar approach of
> virtio-net, adding an host_features variable and setting a corresponding
> feature bit?

Yes, that's a clean way of supporting feature bit options.

Stefan