Re: [Qemu-devel] [PATCH for-3.2 v5 07/19] hw: apply accel compat properties without touching globals

[Igor Mammedov <imammedo@redhat.com>]

On Tue,  4 Dec 2018 18:20:11 +0400
Marc-André Lureau <marcandre.lureau@redhat.com> 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 <marcandre.lureau@redhat.com>
> ---
>  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?

> +
> +    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();
>  }