Re: [Qemu-devel] [Qemu-ppc] [PATCH qemu] spapr: Add /system-id

[Greg Kurz <gkurz@linux.vnet.ibm.com>]

On Thu, 26 Nov 2015 15:29:07 +1100
Alexey Kardashevskiy <aik@ozlabs.ru> wrote:

> On 11/26/2015 11:49 AM, David Gibson wrote:
> > On Wed, Nov 25, 2015 at 04:15:01PM +0100, Alexander Graf wrote:
> >>
> >>
> >> On 18.11.15 11:49, David Gibson wrote:
> >>> On Wed, Nov 18, 2015 at 06:45:39PM +1100, Alexey Kardashevskiy wrote:
> >>>> On 11/09/2015 07:47 PM, David Gibson wrote:
> >>>>> On Mon, Nov 09, 2015 at 05:47:17PM +1100, Alexey Kardashevskiy wrote:
> >>>>>> Section B.6.2.1 Root Node Properties of PAPR specification defines
> >>>>>> a set of properties which shall be present in the device tree root,
> >>>>>> one of these properties is "system-id" which "should be unique across
> >>>>>> all systems and all manufacturers". Since UUID is meant to be unique,
> >>>>>> it makes sense to use it as "system-id".
> >>>>>>
> >>>>>> This adds "system-id" property to the device tree root when not empty.
> >>>>>>
> >>>>>> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> >>>>>> ---
> >>>>>>
> >>>>>> This might be expected by AIX so here is the patch.
> >>>>>> I am really not sure if it makes sense to initialize property when
> >>>>>> UUID is all zeroes as the requirement is "unique" and zero-uuid is
> >>>>>> not.
> >>>>>
> >>>>> Yeah, I think it would be better to omit system-id entirely when a
> >>>>> UUID hasn't been supplied.
> >>>>
> >>>>
> >>>> so this did not go anywhere yet, did it?
> >>>
> >>> No.
> >>
> >> So where is it stuck?
> >
> > I was waiting for a respin which didn't set the property when a UUID
> > hadn't been given.
> >
> 
> This is the original patch:
> 
> 
> +    if (qemu_uuid_set) {
> +        _FDT((fdt_property_string(fdt, "system-id", buf)));
> +    }
> 
> I does not set property if qemu_uuid_set==false already. What did I miss?
> 

It looks like the confusion lies in David's answer to your question
about nil UUID... BTW does it make sense to assign nil UUID to a system ?

--
Greg