From mboxrd@z Thu Jan  1 00:00:00 1970
From: Binarus <lists@binarus.de>
Subject: Re: Fritz!Card, MSIs and virtual machines
Date: Sun, 29 Jan 2012 07:56:11 +0100
Message-ID: <4F24ED8B.8050209@binarus.de>
References: <4F08865E.4090702@binarus.de> <4F0AD455.8070707@siemens.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
To: kvm@vger.kernel.org
Return-path: <kvm-owner@vger.kernel.org>
Received: from smtp-ssl.omeganet.de ([88.198.254.83]:35479 "EHLO
	smtp-ssl.omeganet.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750957Ab2A2G4J (ORCPT <rfc822;kvm@vger.kernel.org>);
	Sun, 29 Jan 2012 01:56:09 -0500
Received: from [192.168.20.110] (p5DD17FDD.dip.t-dialin.net [93.209.127.221])
	(authenticated bits=0)
	by smtp-ssl.omeganet.de (8.14.3/8.14.3/Debian-5+lenny1) with ESMTP id q0T6u5ee001205
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT)
	for <kvm@vger.kernel.org>; Sun, 29 Jan 2012 07:56:07 +0100
In-Reply-To: <4F0AD455.8070707@siemens.com>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

> There are patches in the queue to enable legacy interrupt sharing for
> PCI 2.3 compliant devices at least. But I bet the Fritz hardware
> predates even this (just like my Fritz!Card DSL v2).

Thank you very much for this hint. Do you know when these will be out?

Does anybody know about a PCI ISDN card which is PCI 2.3 compliant?

> Emulating an ISDN adapter could be fairly complicated, specifically if
> the interface the binary Windows driver expects is not well documented.
> Even for Linux-on-Linux, i.e. when you can debug both host and guest
> properly, this will be quite some work (just check the driver code of
> some popular ISDN adapters Linux supports).
> 
> And it may turn out to be timing sensitive, e.g. for fax services.
> Emulation will happen in user space, i.e. in still fairly
> undeterministic QEMU hands, while device path through mostly happens in
> kernel space under KVM control.

I also think that it's not a good idea to solve the problem that way.

Perhaps there is such a thing like a USB ISDN adapter. We then could pass the USB port which this adapter is attached to to the virtual machine. But even if I am able to find such a device, I doubt that our fax system supports it. Nevertheless, there are chances that it works.

Regards,

Peter

P.S. Thanks for bothering with our exotic problem!