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Date:   Mon, 14 Jun 2021 14:42:18 +0530
From:   Viresh Kumar <viresh.kumar@linaro.org>
To:     "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        "Enrico Weigelt, metux IT consult" <info@metux.net>,
        Viresh Kumar <vireshk@kernel.org>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Bill Mills <bill.mills@linaro.org>,
        Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>,
        stratos-dev@op-lists.linaro.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Stefan Hajnoczi <stefanha@redhat.com>,
        "Stefano Garzarella --cc virtualization @ lists . linux-foundation . org" 
        <sgarzare@redhat.com>, virtualization@lists.linux-foundation.org,
        Alistair Strachan <astrachan@google.com>
Subject: Re: [PATCH V3 1/3] gpio: Add virtio-gpio driver
Message-ID: <20210614091218.mj5hdx4xhy4vho5x@vireshk-i7>
References: <cover.1623326176.git.viresh.kumar@linaro.org>
 <10442926ae8a65f716bfc23f32339a6b35e51d5a.1623326176.git.viresh.kumar@linaro.org>
 <CACRpkdZV2v2S5z7CZf_8DV=At9-oPSj7RYFH78hWy3ZX37QnDQ@mail.gmail.com>
 <20210611035623.z4f2ynumzozigqnv@vireshk-i7>
 <CAMuHMdVrtSnFpPbB0P3Wxqm1D6vU1_cnh3ypsZJRNF6ueKdAsw@mail.gmail.com>
 <20210611080122.tlkidv6bowuka6fw@vireshk-i7>
 <0478822f-9d10-deb8-86ae-3b4ac3bb0c6c@metux.net>
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On 14-06-21, 10:07, Enrico Weigelt, metux IT consult wrote:
> On 11.06.21 10:01, Viresh Kumar wrote:
> 
> > No, QEMU passes the raw messages to the backend daemon running in host
> > userspace (which shares a socket with qemu). The backend understands
> > the virtio/vhost protocols and so won't be required to change at all
> > if we move from Qemu to something else. And that's what we (Linaro)
> > are looking to do here with Project Stratos.

This is one of the ways of using it, via a backend running in host
userspace, maybe there are other ways of making this work which I may
not have explored, like handling this within qemu.

> Note that this is completely different from my approach that I've posted
> in autumn last year. Viresh's protocol hasn't much in common with mine.

The protocol hasn't changed in a sense on how it can be used. Yes few
things have moved around, new operations were introduced, but nothing
that will make a change at this level. We are trying to use the
protocol in one of the possible ways and yours can be different.

-- 
viresh