Re: [Qemu-devel] [PATCH] hw/qdev-monitor: report error for -device <not-a-device-type>

[Paolo Bonzini <pbonzini@redhat.com>]

Il 28/11/2012 12:54, Luiz Capitulino ha scritto:
> On Wed, 28 Nov 2012 10:54:33 +0200
> Alon Levy <alevy@redhat.com> wrote:
> 
>> Instead of aborting immediately after at DEVICE_CLASS(obj)
>>
>> Signed-off-by: Alon Levy <alevy@redhat.com>
>> ---
>>  hw/qdev-monitor.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/hw/qdev-monitor.c b/hw/qdev-monitor.c
>> index 479eecd..3b70cdb 100644
>> --- a/hw/qdev-monitor.c
>> +++ b/hw/qdev-monitor.c
>> @@ -426,6 +426,11 @@ DeviceState *qdev_device_add(QemuOpts *opts)
>>          return NULL;
>>      }
>>  
>> +    if (!object_class_dynamic_cast(obj, "device")) {
>> +        qerror_report(QERR_INVALID_PARAMETER_TYPE, "driver", "device type");
>> +        return NULL;
>> +    }
> 
> Gives me the impression that something is wrong before this, but it's
> better to ask a QOM guy (CC'ing them).

I would reuse the same error message as for "if (!obj)", and also use
TYPE_DEVICE instead of the hardcoded string, but the patch is ok.

> How do you reproduce it btw?

$ x86_64-softmmu/qemu-system-x86_64 -device SCSI
Object 0x7f56872248b0 is not an instance of type device
Aborted

However, we also need an object_class_is_abstract method to fix this
similar failure:

$ x86_64-softmmu/qemu-system-x86_64 -device pci-device
**
ERROR:/home/pbonzini/work/upstream/qemu/qom/object.c:306:object_initialize_with_type:
assertion failed: (type->abstract == false)
Aborted

All in all, it makes sense to me that we delay this post-1.3.

Paolo

>> +
>>      k = DEVICE_CLASS(obj);
>>  
>>      /* find bus */
>