Re: [RFC PATCH v2 07/16] hw/core/machine: add machine_class_is_dynamic_sysbus_dev_allowed

[Ani Sinha <ani@xxxxxxxxxxx>]

On Wed, 22 Sep 2021, Damien Hedde wrote:

> Right now the allowance check for adding a sysbus device using
> -device cli option (or device_add qmp command) is done well after
> the device has been created. It is done during the machine init done
> notifier: machine_init_notify() in hw/core/machine.c
>
> This new function will allow us to check if a sysbus device type is
> allowed to be dynamically created by the machine during the device
> creation time.
>
> Also make device_is_dynamic_sysbus() use the new function.
>
> Signed-off-by: Damien Hedde <damien.hedde@xxxxxxxxxxxxx>
> ---
>
> In the context of our series, we need to be able to do the check at
> device creation time to allow doing it depending on the current
> MACHINE_INIT phase.
> ---
>  include/hw/boards.h | 17 +++++++++++++++++
>  hw/core/machine.c   | 15 ++++++++++++---
>  2 files changed, 29 insertions(+), 3 deletions(-)
>
> diff --git a/include/hw/boards.h b/include/hw/boards.h
> index 463a5514f9..934443c1cd 100644
> --- a/include/hw/boards.h
> +++ b/include/hw/boards.h
> @@ -51,6 +51,23 @@ void machine_set_cpu_numa_node(MachineState *machine,
>   */
>  void machine_class_allow_dynamic_sysbus_dev(MachineClass *mc, const char 
> *type);
>
> +/**
> + * machine_class_is_dynamic_sysbus_dev_allowed: Check if type is an allowed
> + * sysbus device type for the machine class.
> + * @mc: Machine class
> + * @type: type to check (should be a subtype of TYPE_SYS_BUS_DEVICE)
> + *
> + * Returns: true if @type is a type in the machine's list of
> + * dynamically pluggable sysbus devices; otherwise false.
> + *
> + * Check if the QOM type @type is in the list of allowed sysbus device
> + * types (see machine_class_allowed_dynamic_sysbus_dev()).
> + * Note that if @type is a subtype of a type which is in the list, it is
> + * allowed too.
> + */
> +bool machine_class_is_dynamic_sysbus_dev_allowed(MachineClass *mc,
> +                                                 const char *type);
> +

How about renaming this to device_type_is_allowed_dynamic_sysbus() ?

>  /**
>   * device_is_dynamic_sysbus: test whether device is a dynamic sysbus device
>   * @mc: Machine class
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index 9125c9aad0..1a18912dc8 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -545,18 +545,27 @@ void 
> machine_class_allow_dynamic_sysbus_dev(MachineClass *mc, const char *type)
>
>  bool device_is_dynamic_sysbus(MachineClass *mc, DeviceState *dev)
>  {
> -    bool allowed = false;
> -    strList *wl;
>      Object *obj = OBJECT(dev);
>
>      if (!object_dynamic_cast(obj, TYPE_SYS_BUS_DEVICE)) {
>          return false;
>      }
>
> +    return machine_class_is_dynamic_sysbus_dev_allowed(mc,
> +            object_get_typename(obj));
> +}
> +
> +bool machine_class_is_dynamic_sysbus_dev_allowed(MachineClass *mc,
> +                                                 const char *type)
> +{
> +    bool allowed = false;
> +    strList *wl;
> +    ObjectClass *klass = object_class_by_name(type);
> +
>      for (wl = mc->allowed_dynamic_sysbus_devices;
>           !allowed && wl;
>           wl = wl->next) {
> -        allowed |= !!object_dynamic_cast(obj, wl->value);
> +        allowed |= !!object_class_dynamic_cast(klass, wl->value);
>      }
>
>      return allowed;
> --
> 2.33.0
>
>