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From: Philippe Mathieu-Daudé
Subject: Re: QOM
Date: Tue, 21 Dec 2021 12:59:05 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.4.0

Hi Abhijeet,

On 12/21/21 12:27, abhijeet inamdar wrote:
> Hi,
> 1)What does QOM stand for?

QOM: "QEMU Object Model"

See https://qemu-project.gitlab.io/qemu/devel/qom.html

> 2)Can anyone tell what this error means? 
> (qemu) Unexpected error in object_property_find() at
> /home/ocp/vcpu-playground/vcpu_on_qemu/qemu-4.2.0/qom/object.c:1177:
> qemu-system-arm: Property '.sysbus-irq[0]' not found
> Aborted (core dumped).

I suppose you are trying to connect a device gpio/irq output line
to another device input, likely using sysbus_connect_irq().

The API is "connect the N-th output line from the SysBus device
to this qemu_irq handler", where qemu_irq is the input line.

Apparently your SysBus device doesn't have any output line
registered. These are registered using sysbus_init_irq().
The first call register the first output IRQ, and so on.

Some objects have their QOM interface documented, for
example to use the ARM GIC see:

Hope that helps.



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