Re: [Qemu-devel] [PATCH 27/28] sysbus: apic: ioapic: convert to QEMU Object Model

[Anthony Liguori]

On 01/24/2012 02:01 PM, Jan Kiszka wrote:
> On 2012-01-24 20:33, Anthony Liguori wrote:
> > This converts three devices because apic and ioapic are subclasses of sysbus.
> > Converting subclasses independently of their base class is prohibitively hard.
>
> Hmm, I think that's more than three... Can you split up? At least per
> target or per board/machine.

I meant three classes of devices.

I don't see a reasonable way to split it up.  I put an awful lot of work into 
just splitting things up at this level.  I know it's a big patch but at the same 
time, the changes are entirely mechanical so reviewing shouldn't be that bad.

> Also, I see a lot of programmatic initialization and a lot of repeating
> patterns (specifically regarding trivial class initialization) - there
> is no better alternative?

Not really, no.  It looks bad now because you have DeviceInfo still.  Once 
DeviceInfo goes away, all of the initialization will happen in the class_init 
function.

The design of QOM is such that a lot of what was previously done via declarative 
structures is now done imperatively.  But the code bloat that came in this patch 
series will decrease significantly with the next series as we eliminate DeviceInfo.

Regards,

Anthony Liguori

> Jan