Re: [Qemu-devel] [PATCH v2 6/6] vmw_pvscsi: Introduce 'x-disable-pcie' backword compatability property

[Shmulik Ladkani <shmulik.ladkani@ravellosystems.com>]

Hi,

On Mon, 14 Dec 2015 20:26:35 +0200 "Michael S. Tsirkin" <mst@redhat.com> wrote:
> > > It's set internally by machine types to avoid breaking
> > > migration.  I don't see any reason for users to set it.
> > 
> > But they do set it :) albeit only through machine types.  I don't think
> > it's different from offloads, just much more specialized.
> > 
> > Or do you mean that it could go away if we decide to remove very old
> > machine types?  I think we would remove compat properties connected to
> > those machine types as well, even without "x-".
> > 
> 
> Then we'll break users who set them directly for some reason.
> So x- means "not part of stable ABI".
> No?

BTW, different drivers use different naming approaches.

E.g. d209c744 'hw/audio/intel-hda: Fix MSI capability address'
suggests a "old_msi_addr" property (yes, underscores) for intel-hda.
Michael, you were the reviewer ;-)

Perhaps we can standartize that "c-" prefix denotes compat properties?

Regards,
Shmulik