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Re: QEMU Library support

From: Alex Bennée
Subject: Re: QEMU Library support
Date: Mon, 10 Aug 2020 11:20:49 +0100
User-agent: mu4e 1.5.5; emacs 28.0.50

Pratik Parvati <pratikp@vayavyalabs.com> writes:

> 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?

Not really. While most devices are fairly standalone they can access all
sorts of QEMU APIs. Why not just implement your device inside the QEMU
source tree?

> 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

Alex Bennée

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