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Date: Mon, 10 Aug 2009 08:02:51 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] Re: virtio-serial: An interface for
	host-guest	communication
References: <20090805175713.GB28738@shareable.org>	<4A79C8D9.5030606@codemonkey.ws>	<20090806103843.GC9222@amit-x200.redhat.com>	<4A7ADAC4.70902@codemonkey.ws>	<20090806134103.GC11733@amit-x200.redhat.com>	<4A7AE169.4000606@codemonkey.ws>	<20090806140404.GA12083@amit-x200.redhat.com>	<20090806173740.GA1178@shareable.org>	<20090807063800.GA16769@amit-x200.redhat.com>	<4A7C36D3.3040305@codemonkey.ws>
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: kvm@vger.kernel.org, "Richard W.M. Jones" <rjones@redhat.com>, Rusty Russell <rusty@rustcorp.com.au>, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, Amit Shah <amit.shah@redhat.com>

Gerd Hoffmann wrote:
>
>> There are some other problems with usb too: It's not transparent to
>> users. Any hotplug event could alert users and that's not desired. It's
>> a system-only thing and should also remain that way.
>
> I think virtio-serial is the better way to handle vmchannel.  Unlike 
> usb virtio is designed to work nicely in a virtual environment.
>
> But vmchannel-over-usbserial should be easy too though in case some 
> guests lacks virtio backports or something.

I think you're missing my fundamental point.  Don't use the kernel as 
the guest interface.

Introduce a userspace daemon that exposes a domain socket.  Then we can 
have a proper protocol that uses reverse fqdns for identification.

We can do the backend over TCP/IP, usb, standard serial, etc.

Regards,

Anthony Liguori