From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: [Qemu-devel] Re: virtio-serial: An interface for host-guest communication Date: Mon, 10 Aug 2009 08:02:51 -0500 Message-ID: <4A801A7B.1020208@codemonkey.ws> 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> <20090810065508.GA4499@amit-x200.redhat.com> <4A7FECCA.8080804@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Amit Shah , kvm@vger.kernel.org, qemu-devel@nongnu.org, Rusty Russell , "Richard W.M. Jones" , virtualization@lists.linux-foundation.org To: Gerd Hoffmann Return-path: Received: from qw-out-2122.google.com ([74.125.92.26]:4505 "EHLO qw-out-2122.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754327AbZHJNCx (ORCPT ); Mon, 10 Aug 2009 09:02:53 -0400 Received: by qw-out-2122.google.com with SMTP id 8so1136800qwh.37 for ; Mon, 10 Aug 2009 06:02:54 -0700 (PDT) In-Reply-To: <4A7FECCA.8080804@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: 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