Re: [Qemu-devel] [PULL 42/43] piix4: add acpi pci hotplug support

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Oct 15, 2013 at 09:27:33AM -0700, Anthony Liguori wrote:
> Paolo Bonzini <pbonzini@redhat.com> writes:
> 
> > Il 15/10/2013 16:35, Michael S. Tsirkin ha scritto:
> >> On Tue, Oct 15, 2013 at 04:31:31PM +0200, Paolo Bonzini wrote:
> >>> Il 14/10/2013 17:01, Michael S. Tsirkin ha scritto:
> >>>> -        VMSTATE_STRUCT(pci0_status, PIIX4PMState, 2, vmstate_pci_status,
> >>>> -                       struct pci_status),
> >>>> +        VMSTATE_STRUCT_TEST(pci0_status, PIIX4PMState,
> >>>> +                            vmstate_test_no_use_acpi_pci_hotplug,
> >>>> +                            2, vmstate_pci_status,
> >>>> +                            struct pci_status),
> >>>
> >>> There's no reason to remove this from the stream when a new machine type
> >>> is in use.  You'll just send out zeroes.
> >> 
> >> Seemed cleaner not to.
> >
> > It certainly would be if we had a self-descriptive migration stream
> > format.
> 
> Yes, removing tests is always a good thing.
> 
> But I think subsections should always be used when they can.  We should
> not break compatibility (even if we technical don't guarantee it) unless
> we absolutely have to.
> 
> Regards,
> 
> Anthony Liguori

OK so I can interpret this in 2 ways wrt bridge hotplug:
- it's in shape for 1.7 except the migration which should use
  subsections (and needs cross-version testing)
- it's not in shape for 1.7

Can you tell me which it is please?

If it's 1 I'll repost a version with tweaked
migration format and cross-version testing report, tomorrow.

If it's 2 I'd rather work on this after the forum, I still
need to make some travel arrangements.

Paolo? Anthony?

-- 
MST