Re: [Qemu-devel] [PATCH v2] New cpu-max field in query-machines QMP command output

[Luiz Capitulino <lcapitulino@redhat.com>]

On Tue, 09 Apr 2013 15:09:21 +0200
Michal Novotny <minovotn@redhat.com> wrote:

> 
> On 04/09/2013 03:06 PM, Luiz Capitulino wrote:
> > On Mon, 08 Apr 2013 11:14:32 -0600
> > Eric Blake <eblake@redhat.com> wrote:
> >
> >> On 04/08/2013 10:41 AM, Michal Novotny wrote:
> >>> Alter the query-machines QMP command to output information about
> >>> maximum number of CPUs for each machine type with default value
> >>> set to 1 in case the number of max_cpus is not set.
> >>>
> >>> Signed-off-by: Michal Novotny <minovotn@redhat.com>
> >>> ---
> >>>  qapi-schema.json | 4 +++-
> >>>  vl.c             | 1 +
> >>>  2 files changed, 4 insertions(+), 1 deletion(-)
> >>>
> >>> diff --git a/qapi-schema.json b/qapi-schema.json
> >>> index db542f6..689ca8d 100644
> >>> --- a/qapi-schema.json
> >>> +++ b/qapi-schema.json
> >>> @@ -2861,11 +2861,13 @@
> >>>  #
> >>>  # @default: #optional whether the machine is default
> >>>  #
> >>> +# @cpu-max: maximum number of CPUs supported by the machine type
> >> Typically, when adding a field in a later version than the original
> >> introduction of the datatype, we add '(since 1.5)' to make it obvious
> >> when to expect the field.  However, as nothing (currently) enforces this
> >> rule, I think such an addition is minor enough that it wouldn't
> >> invalidate the use of my:
> > Oh, it turns out I was making some confusion with this patch and
> > didn't realize it was extending the query-machines command.
> >
> > I don't mean there's anything wrong with it, but my question is: doesn't
> > this patch invalidates query-cpu-max?
> 
> Not really, the query-cpu-max shows maximum number of CPUs supported per
> currently running machine (machine type) however the extension to
> query-machines shows the maximum number of CPUs supported per each of
> the displayed machine types. This usually doesn't matter on x86
> architectures however it does matter on ARM, for example, as ARM has
> some CPU models supporting up to 4 CPUs (highbank model) whereas most of
> the ARM processors does have only one CPU.

Can't we eliminate the query-cpu-max command if we extend the
query-machines command to show which machine type is in use?