Re: [Qemu-devel] [PATCH v6 2/5] hpet: enable to entitle more irq pins for hpet

[liu ping fan]

On Fri, Oct 11, 2013 at 4:38 PM, Paolo Bonzini <address@hidden> wrote:
> Il 11/10/2013 04:59, liu ping fan ha scritto:
>> On Thu, Oct 10, 2013 at 7:41 PM, Michael S. Tsirkin <address@hidden> wrote:
>>> On Thu, Oct 10, 2013 at 11:46:42AM +0200, Paolo Bonzini wrote:
>>>> Il 10/10/2013 11:41, Michael S. Tsirkin ha scritto:
>>>>>>> Are you sure?  This is not done for any other compat property.
>>>>>>>
>>>>>>> Paolo
>>>>> It's done if we use the property from C.
>>>>> See PCI_HOST_PROP_PCI_HOLE64_SIZE.
>>>>>
>>>>> You want compiler to catch errors, that's
>>>>> much better than a runtime failure.
>>>>
>>>> I agree, but I think there should be no need to use the property from C.
>>>>
>>>> Paolo
>>>
>>> Well this patchset does use it from C.
>>> If it's done it needs a macro.
>>
>> hpet.h is the ideal place to put the macro, so pc.c can see it. But
>> what about PC_COMPAT_1_7 in pc.h? I think it is not right to include
>> hpet.h. So can I do not use marco in pc.h?
>
> I think you shouldn't need the macro (no need to use the property from
> C, only from compat properties).
>
We need to tell the compat and then decide to set "intcap" in
pc_basic_device_init()

                uint8_t compat = object_property_get_int(OBJECT(hpet),
                        "intcap", NULL);
                if (!compat) {
                    qdev_prop_set_uint32(hpet, "intcap", 0xff0104);
                }

Regards,
Ping Fan