linux-kernel - Re: virtio-serial: Add multiple times opening support to virtserialport(port)

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Message-ID: <1440577573.32587.11.camel@redhat.com>
Date:	Wed, 26 Aug 2015 10:26:13 +0200
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	Matt Ma <matt.ma@...aro.org>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	kvmarm@...ts.cs.columbia.edu,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Peter Maydell <peter.maydell@...aro.org>
Subject: Re: virtio-serial: Add multiple times opening support to
 virtserialport(port)

  Hi,

> AndroidPipe is a communication channel between the guest system and
> the emulator itself. Guest side device node can be opened by multi
> processes at the same time with different service name. It has a
> de-multiplexer on the QEMU side to figure out which service the guest
> actually wanted, so the first write after opening device node is the
> service name guest wanted, after QEMU backend receive this service
> name, create a corresponding communication channel, initialize related
> component, such as file descriptor which connect to the host socket
> serve. So each opening in guest will create a separated communication
> channel.
> 
> We can create a separate device for each service type, however some
> services, such as the OpenGL emulation, need to have multiple open
> channels at a time. This is currently not possible using the
> virtserialport which can only be opened once.

vsock probably works better then:

http://events.linuxfoundation.org/sites/events/files/slides/stefanha-kvm-forum-2015.pdf

Also: for opengl you might want check out virtio-gpu (assuming you can
build mesa for android).

https://www.kraxel.org/slides/qemu-opengl/

cheers,
  Gerd


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