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Date: Wed, 17 Jun 2015 16:29:49 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v7 0/9] Add limited support of VMware's
	hyper-call rpc
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org, Don Slutz <dslutz@verizon.com>, Luiz Capitulino <lcapitulino@redhat.com>, Anthony Liguori <aliguori@amazon.com>, Andreas =?iso-8859-1?Q?F=E4rber?= <afaerber@suse.de>, Richard Henderson <rth@twiddle.net>

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?