>-----Original Message-----
>From: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
>Subject: Re: [PATCH v2 15/21] hw/vfio/pci: Check CONFIG_IOMMUFD at runtime
>using iommufd_builtin()
>
>On 10/3/25 05:11, Duan, Zhenzhong wrote:
>> Hi Philippe,
>>
>>> -----Original Message-----
>>> From: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
>>> Subject: [PATCH v2 15/21] hw/vfio/pci: Check CONFIG_IOMMUFD at runtime
>>> using iommufd_builtin()
>>>
>>> Convert the compile time check on the CONFIG_IOMMUFD definition
>>> by a runtime one by calling iommufd_builtin().
>>>
>>> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@xxxxxxxxxx>
>>> Reviewed-by: Richard Henderson <richard.henderson@xxxxxxxxxx>
>>> Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
>>> ---
>>> hw/vfio/pci.c | 38 ++++++++++++++++++--------------------
>>> 1 file changed, 18 insertions(+), 20 deletions(-)
>
>
>>> static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
>>> {
>>> @@ -3433,9 +3430,10 @@ static void vfio_pci_dev_class_init(ObjectClass
>*klass,
>>> void *data)
>>>
>>> device_class_set_legacy_reset(dc, vfio_pci_reset);
>>> device_class_set_props(dc, vfio_pci_dev_properties);
>>> -#ifdef CONFIG_IOMMUFD
>>> - object_class_property_add_str(klass, "fd", NULL, vfio_pci_set_fd);
>>> -#endif
>>> + if (iommufd_builtin()) {
>>> + device_class_set_props(dc, vfio_pci_dev_iommufd_properties);
>>
>> device_class_set_props() is called twice. Won't it break qdev_print_props() and
>qdev_prop_walk()?
>
>device_class_set_props() is misnamed, as it doesn't SET an array of
>properties, but ADD them (or 'register') to the class.
>
>See device_class_set_props_n() in hw/core/qdev-properties.c.
But it set dc->props_ and dc->props_count_, first to vfio_pci_dev_properties
and then vfio_pci_dev_iommufd_properties, this will make qdev_prop_walk()
find only iommufd property and miss others. Do I misunderstand?
Thanks
Zhenzhong
>
>I'll see to rename the QDev methods for clarity.
>
>Regards,
>
>Phil.
