Re: Purpose of QOM properties registered at realize time?

[Mark Cave-Ayland]

On 06/10/2020 23:06, Eduardo Habkost wrote:

> Hi,
> 
> While trying to understand how QOM properties are used in QEMU, I
> stumbled upon multiple cases where alias properties are added at
> realize time.
> 
> Now, I don't understand why those properties exist.  As the
> properties are added at realize time, I assume they aren't
> supposed to be touched by the user at all.  If they are not
> supposed to be touched by the user, what exactly is the purpose
> of those QOM properties?
> 
> For reference, these are the cases I've found:

(cut)

> --
> hw/misc/mac_via.c=1011=static void mac_via_realize(DeviceState *dev, Error 
> **errp)
> hw/misc/mac_via.c:1028:    object_property_add_alias(OBJECT(dev), "irq[0]", 
> OBJECT(ms),

This one was me trying to work out how to wire up an IRQ from a child device 
embedded
within the macio device - I'll send a patch to remove it shortly.


ATB,

Mark.