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Re: [Qemu-devel] [PATCH qom-next 4/6] pc: move apic_mapped initializatio

From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH qom-next 4/6] pc: move apic_mapped initialization into common apic init code
Date: Thu, 24 May 2012 15:45:37 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120421 Thunderbird/12.0

Am 24.05.2012 15:10, schrieb Igor Mammedov:
> On 05/23/2012 11:26 PM, Peter Maydell wrote:
>> On 23 May 2012 22:09, Igor Mammedov<address@hidden>  wrote:
>>> For cpu-hotplug it was suggested to use device_add/del
>>> interface for it. To do so in a generalized way hot-plugged cpu
>>> should follow general QOM object creation sequence, i.e.
>>>   - create new cpu instance
>>>   - set properties
>>>   - realize instance
>>> without creating precedent of special case for cpus in device_add/del
>>> if possible. So goal is to have a self-sufficient cpu object that
>>> doesn't require external hooks to create/initialize it. It looks
>>> possible do so for target-i386 at least.
>> I think your self-sufficient CPU object should probably be a
>> container QOM object which contains the CPU core itself and
>> the APIC device. Then the container object's initialisation
>> can map the APIC device.
> For x86 it would be artificial thing without a real hardware to
> model after, that would needlessly complicate code and interface.
> I'd rather avoid this.
> Meanwhile I've found only two devices that do mapping inside
> device's initfn :(
> hw/lm32_sys.c
> hw/bonito.c
> and lm32_sys has comment:
>     /* Note: This device is not created in the board initialization,
>      * instead it has to be added with the -device parameter. Therefore,
>      * the device maps itself. */
> So for some devices it's possible to do so.

Simply put: Doing the mmio_map after qdev init is historical and no
reason to keep doing so. It breaks the desired late-realize model.

I believe Anthony's controversial series on GitHub with the
"boilerplate" accessors that Peter so disliked tried to fix this?


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