Re: QEMU Library support

[Pratik Parvati]

As an experiment, I have modelled non-existing ARM Watchdog model (SP805) interfaced to the versatile PB platform. What actually I was looking is - some sort of QEMU library, where I can model new device outside the QEMU source hierarchy and still be able to compile it using QEMU library and include files to add support for the new device. If QEMU doesn't provide a library, Is there a flexibly that I can tweak something inside the QEMU to generate it?

Regards,

Pratik

On Mon, Aug 10, 2020 at 3:18 PM Alex Bennée <alex.bennee@linaro.org> wrote:

Pratik Parvati <pratikp@vayavyalabs.com> writes:

> Hi team,
>
> Lately, I have been working on QEMU modeling and interfacing it into the
> existing platform. What actually I wanted to check is; whether QEMU
> supports library that gives developers a clean interface to develop and
> integrate peripheral model in to QEMU. I know of the Greensocs SystemC
> bridge - but that was quite difficult to work with in past.

Not really - with a few exceptions like vhost-user and in KVM device
emulation all devices are emulated in the QEMU code base. As a result
the best way to maintain a device is to have it integrated upstream
(along with some tests to ensure it is working).

As you note there are various forks of QEMU that support device
modelling but none of these features have been merged upstream and would
likely need to assuage worries about such interfaces being used to avoid
GPL compliance.

What sort of devices are you looking to model? Are these existing
devices or experimental/research things?

--
Alex Bennée