Re: [PATCH v6 14/15] qmp: Include "reserve" property of memory backends

[David Hildenbrand]

On 23.04.21 13:00, Markus Armbruster wrote:
> David Hildenbrand <david@redhat.com> writes:
>
> > Let's include the new property.
> >
> > Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> > Cc: Eric Blake <eblake@redhat.com>
> > Cc: Markus Armbruster <armbru@redhat.com>
> > Cc: Igor Mammedov <imammedo@redhat.com>
> > Signed-off-by: David Hildenbrand <david@redhat.com>
> > ---
> >   hw/core/machine-qmp-cmds.c | 1 +
> >   qapi/machine.json          | 4 ++++
> >   2 files changed, 5 insertions(+)
> >
> > diff --git a/hw/core/machine-qmp-cmds.c b/hw/core/machine-qmp-cmds.c
> > index d41db5b93b..2d135ecdd0 100644
> > --- a/hw/core/machine-qmp-cmds.c
> > +++ b/hw/core/machine-qmp-cmds.c
> > @@ -175,6 +175,7 @@ static int query_memdev(Object *obj, void *opaque)
> >           m->dump = object_property_get_bool(obj, "dump", &error_abort);
> >           m->prealloc = object_property_get_bool(obj, "prealloc", &error_abort);
> >           m->share = object_property_get_bool(obj, "share", &error_abort);
> > +        m->reserve = object_property_get_bool(obj, "reserve", &error_abort);
> >           m->policy = object_property_get_enum(obj, "policy", "HostMemPolicy",
> >                                                &error_abort);
> >           host_nodes = object_property_get_qobject(obj,
> > diff --git a/qapi/machine.json b/qapi/machine.json
> > index 32650bfe9e..5932139d20 100644
> > --- a/qapi/machine.json
> > +++ b/qapi/machine.json
> > @@ -798,6 +798,9 @@
> >   #
> >   # @share: whether memory is private to QEMU or shared (since 6.1)
> >   #
> > +# @reserve: whether swap space (or huge pages) was reserved if applicable
> > +#           (since 6.1)
> > +#
> >   # @host-nodes: host nodes for its memory policy
> >   #
> >   # @policy: memory policy of memory backend
> > @@ -812,6 +815,7 @@
> >       'dump':       'bool',
> >       'prealloc':   'bool',
> >       'share':      'bool',
> > +    'reserve':    'bool',
> >       'host-nodes': ['uint16'],
> >       'policy':     'HostMemPolicy' }}
>
> Double-checking: true means definitely reserved, and false means
> definitely not reserved.  Correct?

True means "reserved if applicable" which means "not reserved if not 
applicable". False means "definitely not reserved".

(any recommendation how to rephrase are appreciated; I tried my best -- 
this interface here makes it especially hard -- it's easier for the 
property itself)

--
Thanks,

David / dhildenb