linux-kernel - Re: [RFC v1 07/10] iio: light: opt3001: add roadtest

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Message-ID: <10ef3f98ccc8d7c545fec5e8a7a832194797a3d6.camel@sipsolutions.net>
Date:   Tue, 29 Mar 2022 16:52:14 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kernel <kernel@...s.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-um@...ts.infradead.org" <linux-um@...ts.infradead.org>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "corbet@....net" <corbet@....net>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [RFC v1 07/10] iio: light: opt3001: add roadtest

On Tue, 2022-03-29 at 16:50 +0200, Johannes Berg wrote:
> > Or perhaps you are implying that hw/virtio/vhost-user-i2c* in QEMU are
> > not strictly needed?
> 
> I _thought_ that was the case, but honestly, that was just from reading
> about it, not looking at the code. Thinking about it though, I don't
> need special glue in UML, just passing the device ID on the command
> line? So not sure what they need the glue for. Looking at the code, it's
> not really much though? Not sure, I guess you need somebody more
> familiar with qemu here, sorry.
> 

So here
https://www.qemu.org/docs/master/system/devices/vhost-user.html#vhost-user-device

the docs say:

   These are simple stub devices that ensure the VirtIO device is
   visible to the guest. The code is mostly boilerplate although each
   device has a chardev option which specifies the ID of the --chardev
   device that connects via a socket to the vhost-user daemon.

So maybe if the ID were specified via the command line too, you could
have a generic vhost-user stub in qemu?

johannes