Re: [Qemu-devel] [PATCH] qemu-options: document existance of versioned machine types

[Paolo Bonzini <pbonzini@redhat.com>]

> 
> On 07/25/2017 10:10 AM, Daniel P. Berrange wrote:
> > The -machine docs did not explain what the versioned machine
> > types are for, nor that they'll be maintained across
> > releases.
> > 
> > Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> > ---
> >   qemu-options.hx | 15 ++++++++++++++-
> >   1 file changed, 14 insertions(+), 1 deletion(-)
> > 
> > diff --git a/qemu-options.hx b/qemu-options.hx
> > index 746b5fa75d..9f6e2adfff 100644
> > --- a/qemu-options.hx
> > +++ b/qemu-options.hx
> > @@ -49,7 +49,20 @@ STEXI
> >   @item -machine [type=]@var{name}[,prop=@var{value}[,...]]
> >   @findex -machine
> >   Select the emulated machine by @var{name}. Use @code{-machine help} to
> >   list
> > -available machines. Supported machine properties are:
> > +available machines.
> > +
> > +For architectures which aim to support live migration compatibility
> > +across releases, each release will introduce a new versioned machine
> > +type. For example, the 2.8.0 release introduced machine types
> > +``pc-i440fx-2.8'' and ``pc-q35-2.8'' for the x86_64/i686 architectures.
> 
> Seems like an improvement to me, but do we have any formal policy on how
> long we support said machine types? The new wording prompts that question.

Forever, and ever...

Paolo