Re: [Qemu-devel] [PATCH v7 0/9] Add limited support of VMware's hyper-call rpc

[Michael S. Tsirkin]

On Wed, Jun 17, 2015 at 04:27:13PM +0200, Paolo Bonzini wrote:
> 
> 
> On 17/06/2015 16:18, Michael S. Tsirkin wrote:
> >> > Yes, that's what was done for parallel and pcspk as well.  There's no
> >> > infrastructure to avoid it.
> >> > 
> >> > Paolo
> > How do you mean? We have multiple ways to keep devices
> > compatible with old versions.
> > Set a new property to skip the extra stuff.
> 
> Not if the device didn't have a vmstate at all, unfortunately.

?
Skip creating the device completely for old machine types.

> > Since we enable this thing by default (why do we?)
> > this seems like a big deal ...
> 
> The PC speaker device is also enabled by default.
> 
> Paolo

This is historical, isn't it?