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Re: [Qemu-devel] [PATCH for-3.2 v5 07/19] hw: apply accel compat propert


From: Marc-André Lureau
Subject: Re: [Qemu-devel] [PATCH for-3.2 v5 07/19] hw: apply accel compat properties without touching globals
Date: Wed, 12 Dec 2018 16:00:06 +0400

Hi
On Mon, Dec 10, 2018 at 8:55 PM Igor Mammedov <address@hidden> wrote:
>
> On Mon, 10 Dec 2018 17:45:22 +0100
> Igor Mammedov <address@hidden> wrote:
>
> > On Tue,  4 Dec 2018 18:20:11 +0400
> > Marc-André Lureau <address@hidden> wrote:
> >
> > > Instead of registering compat properties as globals, let's keep them
> > > in their own array, to avoid mixing with user globals.
> > >
> > > Introduce object_apply_global_props() function, to apply compatibility
> > > properties from a GPtrArray.
> > >
> > > Signed-off-by: Marc-André Lureau <address@hidden>
> > > ---
> > >  include/hw/qdev-core.h | 10 ++++++++++
> > >  include/qom/object.h   |  3 +++
> > >  include/sysemu/accel.h |  4 +---
> > >  accel/accel.c          | 12 ------------
> > >  hw/core/qdev.c         |  9 +++++++++
> > >  hw/xen/xen-common.c    |  9 ++++++---
> > >  qom/object.c           | 25 +++++++++++++++++++++++++
> > >  vl.c                   |  1 -
> > >  8 files changed, 54 insertions(+), 19 deletions(-)
> > >
> > [...]
> > > diff --git a/hw/xen/xen-common.c b/hw/xen/xen-common.c
> > > index 6ec14c73ca..4532aa8632 100644
> > > --- a/hw/xen/xen-common.c
> > > +++ b/hw/xen/xen-common.c
> > > @@ -174,18 +174,21 @@ static GlobalProperty xen_compat_props[] = {
> > >          .driver = "migration",
> > >          .property = "send-section-footer",
> > >          .value = "off",
> > > -    },
> > > -    { /* end of list */ },
> > > +    }
> > >  };
> > >
> > >  static void xen_accel_class_init(ObjectClass *oc, void *data)
> > >  {
> > >      AccelClass *ac = ACCEL_CLASS(oc);
> > > +
> > >      ac->name = "Xen";
> > >      ac->init_machine = xen_init;
> > >      ac->setup_post = xen_setup_post;
> > >      ac->allowed = &xen_allowed;
> > > -    ac->global_props = xen_compat_props;
> > > +    ac->compat_props = g_ptr_array_new();
> > where is matching free for that?
> can we at least annotate it somehow so that valgrind won't complain about 
> this leak?

If you check my commits on qemu, you should see that I do care (too
much?) about leaks :)

In this case though, I don't see valgrind or asan complaining, I guess
it's still a reachable reference.
Do you think a FIXME comment would be helpful?

(/me wish we had a proper object system, GObject, but that ship as
long sailed..)

>
> >
> > > +
> > > +    compat_props_add(ac->compat_props,
> > > +                     xen_compat_props, G_N_ELEMENTS(xen_compat_props));
> > >  }
> > >
> > >  #define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
> > > diff --git a/qom/object.c b/qom/object.c
> > > index 17921c0a71..dbdab0aead 100644
> > > --- a/qom/object.c
> > > +++ b/qom/object.c
> > > @@ -370,6 +370,31 @@ static void object_post_init_with_type(Object *obj, 
> > > TypeImpl *ti)
> > >      }
> > >  }
> > >
> > > +void object_apply_global_props(Object *obj, const GPtrArray *props, 
> > > Error **errp)
> > > +{
> > > +    Error *err = NULL;
> > > +    int i;
> > > +
> > > +    if (!props) {
> > > +        return;
> > > +    }
> > > +
> > > +    for (i = 0; i < props->len; i++) {
> > > +        GlobalProperty *p = g_ptr_array_index(props, i);
> > > +
> > > +        if (object_dynamic_cast(obj, p->driver) == NULL) {
> > > +            continue;
> > > +        }
> > > +        p->used = true;
> > > +        object_property_parse(obj, p->value, p->property, &err);
> > > +        if (err != NULL) {
> > > +            error_prepend(&err, "can't apply global %s.%s=%s: ",
> > > +                          p->driver, p->property, p->value);
> > > +            error_propagate(errp, err);
> > > +        }
> > > +    }
> > > +}
> > > +
> > >  static void object_initialize_with_type(void *data, size_t size, 
> > > TypeImpl *type)
> > >  {
> > >      Object *obj = data;
> > > diff --git a/vl.c b/vl.c
> > > index a5ae5f23d2..88ba658572 100644
> > > --- a/vl.c
> > > +++ b/vl.c
> > > @@ -2968,7 +2968,6 @@ static void user_register_global_props(void)
> > >   */
> > >  static void register_global_properties(MachineState *ms)
> > >  {
> > > -    accel_register_compat_props(ms->accelerator);
> > >      machine_register_compat_props(ms);
> > >      user_register_global_props();
> > >  }
> >
> >
>
>


-- 
Marc-André Lureau



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