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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 Bennée" <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
Date: Mon, 14 Jun 2021 14:54:22 +0530	[thread overview]
Message-ID: <20210614092422.jmq2i3vlkjmy6cvf@vireshk-i7> (raw)
In-Reply-To: <db2d29fd-ff27-0c75-2472-dd031564dbf1@metux.net>

On 14-06-21, 10:03, Enrico Weigelt, metux IT consult wrote:
> for qemu side you might be interested in my patch queue from last year
> (including the virtio-gpio implementation) - it also introduces an
> gpio backend subsys that allows attaching simulation gpio's to various
> backends. so far just implemented a dummy backend (that can be
> manipulated by qemu console) and using it just in the virtio-gpio
> device emulation.
> 
> https://github.com/oss-qm/qemu/tree/wip/gpio-v2

Interesting, so this is a qemu-specific backend you have here.

The way we are looking to write the backend (in Project Stratos at
Linaro) is to make it hypervisor agnostic. So any hypervisor that
understands the vhost protocol can use our backend without changing a
single line of code. The backend will not be part of any
hypervisor's/VMM's source code. FWIW, this doesn't add anything
special to the virtio protocol (like GPIO).

Here is a C based backend we have for I2C:

https://yhbt.net/lore/all/cover.1617278395.git.viresh.kumar@linaro.org/T/#m3b5044bad9769b170f505e63bd081eb27cef8db2

I started with keeping code in QEMU itself but now replaced it with
one in RUST.

https://github.com/vireshk/vhost-device/tree/master/src/i2c

-- 
viresh

WARNING: multiple messages have this Message-ID (diff)
From: Viresh Kumar <viresh.kumar@linaro.org>
To: "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Cc: Alistair Strachan <astrachan@google.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Stefan Hajnoczi <stefanha@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Viresh Kumar <vireshk@kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	virtualization@lists.linux-foundation.org,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	stratos-dev@op-lists.linaro.org, "Enrico Weigelt,
	metux IT consult" <info@metux.net>,
	Bill Mills <bill.mills@linaro.org>
Subject: Re: [PATCH V3 1/3] gpio: Add virtio-gpio driver
Date: Mon, 14 Jun 2021 14:54:22 +0530	[thread overview]
Message-ID: <20210614092422.jmq2i3vlkjmy6cvf@vireshk-i7> (raw)
In-Reply-To: <db2d29fd-ff27-0c75-2472-dd031564dbf1@metux.net>

On 14-06-21, 10:03, Enrico Weigelt, metux IT consult wrote:
> for qemu side you might be interested in my patch queue from last year
> (including the virtio-gpio implementation) - it also introduces an
> gpio backend subsys that allows attaching simulation gpio's to various
> backends. so far just implemented a dummy backend (that can be
> manipulated by qemu console) and using it just in the virtio-gpio
> device emulation.
> 
> https://github.com/oss-qm/qemu/tree/wip/gpio-v2

Interesting, so this is a qemu-specific backend you have here.

The way we are looking to write the backend (in Project Stratos at
Linaro) is to make it hypervisor agnostic. So any hypervisor that
understands the vhost protocol can use our backend without changing a
single line of code. The backend will not be part of any
hypervisor's/VMM's source code. FWIW, this doesn't add anything
special to the virtio protocol (like GPIO).

Here is a C based backend we have for I2C:

https://yhbt.net/lore/all/cover.1617278395.git.viresh.kumar@linaro.org/T/#m3b5044bad9769b170f505e63bd081eb27cef8db2

I started with keeping code in QEMU itself but now replaced it with
one in RUST.

https://github.com/vireshk/vhost-device/tree/master/src/i2c

-- 
viresh
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization

  reply	other threads:[~2021-06-14  9:25 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-10 12:09 [PATCH V3 0/3] gpio: Add virtio based driver Viresh Kumar
2021-06-10 12:09 ` Viresh Kumar
2021-06-10 12:16 ` [PATCH V3 1/3] gpio: Add virtio-gpio driver Viresh Kumar
2021-06-10 12:16   ` Viresh Kumar
2021-06-10 13:22   ` Arnd Bergmann
2021-06-10 16:00     ` Enrico Weigelt, metux IT consult
     [not found]     ` <01000179f6a7715c-cd106846-7770-4088-bb7c-a696bfcbf83e-000000@email.amazonses.com>
2021-06-10 17:03       ` [Stratos-dev] " Jean-Philippe Brucker
2021-06-10 17:03         ` Jean-Philippe Brucker
2021-06-10 19:41         ` Arnd Bergmann
2021-06-14 10:21     ` Viresh Kumar
2021-06-14 10:21       ` Viresh Kumar
2021-06-14 12:31       ` Arnd Bergmann
2021-06-14 12:49         ` Vincent Guittot
     [not found]         ` <0100017a0a9264cc-57668c56-fdbf-412a-9f82-9bf95f5c653e-000000@email.amazonses.com>
2021-06-14 12:58           ` [Stratos-dev] " Arnd Bergmann
2021-06-14 13:24             ` Vincent Guittot
2021-06-14 20:54               ` Arnd Bergmann
2021-06-15  7:30                 ` Vincent Guittot
2021-06-10 15:54   ` Enrico Weigelt, metux IT consult
2021-06-10 16:57     ` Viresh Kumar
2021-06-10 16:57       ` Viresh Kumar
2021-06-10 20:46   ` Linus Walleij
2021-06-10 20:46     ` Linus Walleij
2021-06-11  3:56     ` Viresh Kumar
2021-06-11  3:56       ` Viresh Kumar
2021-06-11  7:42       ` Geert Uytterhoeven
2021-06-11  7:42         ` Geert Uytterhoeven
2021-06-11  8:01         ` Viresh Kumar
2021-06-11  8:01           ` Viresh Kumar
2021-06-11  8:22           ` Geert Uytterhoeven
2021-06-11  8:22             ` Geert Uytterhoeven
2021-06-15 11:15             ` Viresh Kumar
2021-06-15 11:15               ` Viresh Kumar
2021-06-15 11:37               ` Geert Uytterhoeven
2021-06-15 11:37                 ` Geert Uytterhoeven
2021-06-15 20:03               ` Linus Walleij
2021-06-15 20:03                 ` Linus Walleij
2021-06-16  1:45                 ` Viresh Kumar
2021-06-16  1:45                   ` Viresh Kumar
2021-06-14  8:07           ` Enrico Weigelt, metux IT consult
2021-06-14  8:12             ` Andy Shevchenko
2021-06-14  8:12               ` Andy Shevchenko
2021-06-14  9:14               ` Viresh Kumar
2021-06-14  9:14                 ` Viresh Kumar
2021-06-14  9:17               ` Enrico Weigelt, metux IT consult
2021-06-14  9:52                 ` Viresh Kumar
2021-06-14  9:52                   ` Viresh Kumar
2021-06-14  9:12             ` Viresh Kumar
2021-06-14  9:12               ` Viresh Kumar
2021-06-14  9:29               ` Enrico Weigelt, metux IT consult
2021-06-14  8:03         ` Enrico Weigelt, metux IT consult
2021-06-14  9:24           ` Viresh Kumar [this message]
2021-06-14  9:24             ` Viresh Kumar
2021-06-16  3:30     ` Bjorn Andersson
2021-06-16  3:30       ` Bjorn Andersson
2021-06-16 15:52       ` Enrico Weigelt, metux IT consult
2021-06-18  9:13         ` Linus Walleij
2021-06-18  9:13           ` Linus Walleij
2021-06-21 17:25         ` Bjorn Andersson
2021-06-21 17:25           ` Bjorn Andersson
2021-06-10 12:16 ` [PATCH V3 2/3] gpio: virtio: Add IRQ support Viresh Kumar
2021-06-10 12:16   ` Viresh Kumar
2021-06-10 21:30   ` Linus Walleij
2021-06-10 21:30     ` Linus Walleij
2021-06-14  7:08     ` Viresh Kumar
2021-06-14  7:08       ` Viresh Kumar
2021-06-10 12:16 ` [PATCH V3 3/3] MAINTAINERS: Add entry for Virtio-gpio Viresh Kumar
     [not found] ` <01000179f5da7763-2ea817c6-e176-423a-952e-de02443f71e2-000000@email.amazonses.com>
2021-06-10 17:40   ` [PATCH V3 1/3] gpio: Add virtio-gpio driver Jean-Philippe Brucker
2021-06-10 17:40     ` Jean-Philippe Brucker
2021-06-11  3:39     ` Viresh Kumar
2021-06-11  3:39       ` Viresh Kumar
     [not found]     ` <01000179f9276678-ae2bb25f-4c0c-4176-b906-650c585b9753-000000@email.amazonses.com>
2021-06-11  8:34       ` [Stratos-dev] " Arnd Bergmann
2021-06-14  5:26         ` Viresh Kumar
2021-06-14  5:26           ` Viresh Kumar

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