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>
other than static leak looks fine, considering that we already
leak compat_props, it doesn't really matter, so:

Reviewed-by: Igor Mammedov <imammedo@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/include/hw/qdev-core.h b/include/hw/qdev-core.h
> index a24d0dd566..aeaa6dbbb8 100644
> --- a/include/hw/qdev-core.h
> +++ b/include/hw/qdev-core.h
> @@ -267,6 +267,16 @@ typedef struct GlobalProperty {
>      Error **errp;
>  } GlobalProperty;
>  
> +static inline void
> +compat_props_add(GPtrArray *arr,
> +                 GlobalProperty props[], size_t nelem)
> +{
> +    int i;
> +    for (i = 0; i < nelem; i++) {
> +        g_ptr_array_add(arr, (void *)&props[i]);
> +    }
> +}
> +
>  /*** Board API.  This should go away once we have a machine config file.  ***/
>  
>  DeviceState *qdev_create(BusState *bus, const char *name);
> diff --git a/include/qom/object.h b/include/qom/object.h
> index 0139838b69..5183c587f3 100644
> --- a/include/qom/object.h
> +++ b/include/qom/object.h
> @@ -676,6 +676,9 @@ Object *object_new_with_propv(const char *typename,
>                                Error **errp,
>                                va_list vargs);
>  
> +void object_apply_global_props(Object *obj, const GPtrArray *props,
> +                               Error **errp);
> +
>  /**
>   * object_set_props:
>   * @obj: the object instance to set properties on
> diff --git a/include/sysemu/accel.h b/include/sysemu/accel.h
> index 637358f430..f331d128e9 100644
> --- a/include/sysemu/accel.h
> +++ b/include/sysemu/accel.h
> @@ -49,7 +49,7 @@ typedef struct AccelClass {
>       * global properties may be overridden by machine-type
>       * compat_props or user-provided global properties.
>       */
> -    GlobalProperty *global_props;
> +    GPtrArray *compat_props;
>  } AccelClass;
>  
>  #define TYPE_ACCEL "accel"
> @@ -67,8 +67,6 @@ typedef struct AccelClass {
>  extern unsigned long tcg_tb_size;
>  
>  void configure_accelerator(MachineState *ms);
> -/* Register accelerator specific global properties */
> -void accel_register_compat_props(AccelState *accel);
>  /* Called just before os_setup_post (ie just before drop OS privs) */
>  void accel_setup_post(MachineState *ms);
>  
> diff --git a/accel/accel.c b/accel/accel.c
> index 3da26eb90f..6db5d8f4df 100644
> --- a/accel/accel.c
> +++ b/accel/accel.c
> @@ -119,18 +119,6 @@ void configure_accelerator(MachineState *ms)
>      }
>  }
>  
> -void accel_register_compat_props(AccelState *accel)
> -{
> -    AccelClass *class = ACCEL_GET_CLASS(accel);
> -    GlobalProperty *prop = class->global_props;
> -
> -    for (; prop && prop->driver; prop++) {
> -        /* Any compat_props must never cause error */
> -        prop->errp = &error_abort;
> -        qdev_prop_register_global(prop);
> -    }
> -}
> -
>  void accel_setup_post(MachineState *ms)
>  {
>      AccelState *accel = ms->accelerator;
> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
> index 6b3cc55b27..53b507164f 100644
> --- a/hw/core/qdev.c
> +++ b/hw/core/qdev.c
> @@ -972,6 +972,15 @@ static void device_initfn(Object *obj)
>  
>  static void device_post_init(Object *obj)
>  {
> +    if (object_dynamic_cast(qdev_get_machine(), TYPE_MACHINE)) {
> +        MachineState *m = MACHINE(qdev_get_machine());
> +        AccelClass *ac = ACCEL_GET_CLASS(m->accelerator);
> +
> +        if (ac->compat_props) {
> +            object_apply_global_props(obj, ac->compat_props, &error_abort);
> +        }
> +    }
> +
>      qdev_prop_set_globals(DEVICE(obj));
>  }
>  
> 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();
> +
> +    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();
>  }