Re: [Qemu-devel] [RFC PATCH v2.1 05/12] qdev: hotplug: Introduce HotplugHandler.pre_plug() callback

[Paolo Bonzini]

On 01/04/2016 05:30, David Gibson wrote:
> On Thu, Mar 31, 2016 at 02:09:14PM +0530, Bharata B Rao wrote:
>> From: Igor Mammedov <address@hidden>
>>
>> pre_plug callback is to be called before device.realize() is executed.
>> This would allow to check/set device's properties from HotplugHandler.
>>
>> Signed-off-by: Igor Mammedov <address@hidden>
>> Signed-off-by: Bharata B Rao <address@hidden>
> 
> Reviewed-by: David Gibson <address@hidden>
> 
> It would be really nice to get some opinion on this from Andreas or
> Paolo.

Certainly okay for me, Igor did all of the HotplugHandler design and work.

Paolo

>> ---
>>  hw/core/hotplug.c    | 11 +++++++++++
>>  hw/core/qdev.c       |  9 ++++++++-
>>  include/hw/hotplug.h | 14 +++++++++++++-
>>  3 files changed, 32 insertions(+), 2 deletions(-)
>>
>> diff --git a/hw/core/hotplug.c b/hw/core/hotplug.c
>> index 645cfca..17ac986 100644
>> --- a/hw/core/hotplug.c
>> +++ b/hw/core/hotplug.c
>> @@ -13,6 +13,17 @@
>>  #include "hw/hotplug.h"
>>  #include "qemu/module.h"
>>  
>> +void hotplug_handler_pre_plug(HotplugHandler *plug_handler,
>> +                              DeviceState *plugged_dev,
>> +                              Error **errp)
>> +{
>> +    HotplugHandlerClass *hdc = HOTPLUG_HANDLER_GET_CLASS(plug_handler);
>> +
>> +    if (hdc->pre_plug) {
>> +        hdc->pre_plug(plug_handler, plugged_dev, errp);
>> +    }
>> +}
>> +
>>  void hotplug_handler_plug(HotplugHandler *plug_handler,
>>                            DeviceState *plugged_dev,
>>                            Error **errp)
>> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
>> index db41aa1..a0b3aad 100644
>> --- a/hw/core/qdev.c
>> +++ b/hw/core/qdev.c
>> @@ -1062,6 +1062,14 @@ static void device_set_realized(Object *obj, bool 
>> value, Error **errp)
>>              g_free(name);
>>          }
>>  
>> +        hotplug_ctrl = qdev_get_hotplug_handler(dev);
>> +        if (hotplug_ctrl) {
>> +            hotplug_handler_pre_plug(hotplug_ctrl, dev, &local_err);
>> +            if (local_err != NULL) {
>> +                goto fail;
>> +            }
>> +        }
>> +
>>          if (dc->realize) {
>>              dc->realize(dev, &local_err);
>>          }
>> @@ -1072,7 +1080,6 @@ static void device_set_realized(Object *obj, bool 
>> value, Error **errp)
>>  
>>          DEVICE_LISTENER_CALL(realize, Forward, dev);
>>  
>> -        hotplug_ctrl = qdev_get_hotplug_handler(dev);
>>          if (hotplug_ctrl) {
>>              hotplug_handler_plug(hotplug_ctrl, dev, &local_err);
>>          }
>> diff --git a/include/hw/hotplug.h b/include/hw/hotplug.h
>> index 2db025d..50d84e9 100644
>> --- a/include/hw/hotplug.h
>> +++ b/include/hw/hotplug.h
>> @@ -46,7 +46,8 @@ typedef void (*hotplug_fn)(HotplugHandler *plug_handler,
>>   * hardware (un)plug functions.
>>   *
>>   * @parent: Opaque parent interface.
>> - * @plug: plug callback.
>> + * @pre_plug: pre plug callback called at start of device.realize(true)
>> + * @plug: plug callback called at end of device.realize(true).
>>   * @unplug_request: unplug request callback.
>>   *                  Used as a means to initiate device unplug for devices 
>> that
>>   *                  require asynchronous unplug handling.
>> @@ -59,6 +60,7 @@ typedef struct HotplugHandlerClass {
>>      InterfaceClass parent;
>>  
>>      /* <public> */
>> +    hotplug_fn pre_plug;
>>      hotplug_fn plug;
>>      hotplug_fn unplug_request;
>>      hotplug_fn unplug;
>> @@ -74,6 +76,16 @@ void hotplug_handler_plug(HotplugHandler *plug_handler,
>>                            Error **errp);
>>  
>>  /**
>> + * hotplug_handler_pre_plug:
>> + *
>> + * Call #HotplugHandlerClass.pre_plug callback of @plug_handler.
>> + */
>> +void hotplug_handler_pre_plug(HotplugHandler *plug_handler,
>> +                              DeviceState *plugged_dev,
>> +                              Error **errp);
>> +
>> +
>> +/**
>>   * hotplug_handler_unplug_request:
>>   *
>>   * Calls #HotplugHandlerClass.unplug_request callback of @plug_handler.
>

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