From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764995AbXGSJXZ (ORCPT ); Thu, 19 Jul 2007 05:23:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755287AbXGSJXR (ORCPT ); Thu, 19 Jul 2007 05:23:17 -0400 Received: from il.qumranet.com ([82.166.9.18]:38114 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753004AbXGSJXQ (ORCPT ); Thu, 19 Jul 2007 05:23:16 -0400 Message-ID: <469F2D8C.7020805@qumranet.com> Date: Thu, 19 Jul 2007 12:23:24 +0300 From: Avi Kivity User-Agent: Thunderbird 2.0.0.0 (X11/20070419) MIME-Version: 1.0 To: Lennart Sorensen CC: Alan Cox , Dor Laor , kvm-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [kvm-devel] [RFC] Deferred interrupt handling. References: <005901c7c921$79c006c0$6d401440$@com> <20070718123040.615795b7@the-village.bc.nu> <64F9B87B6B770947A9F8391472E032160CC16C92@ehost011-8.exch011.intermedia.net> <20070718174736.0baf6d0e@the-village.bc.nu> <469E43D5.70802@qumranet.com> <20070718191433.GB24545@csclub.uwaterloo.ca> In-Reply-To: <20070718191433.GB24545@csclub.uwaterloo.ca> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Lennart Sorensen wrote: > On Wed, Jul 18, 2007 at 07:46:13PM +0300, Avi Kivity wrote: > >> IMO the only reasonable solution is to disallow interrupt forwarding >> with shared irqs. If someone later comes up with a bright idea, we can >> implement it. Otherwise the problem will solve itself with hardware >> moving to msi. >> > > Disallowing shared IRQs means disallowing PCI devices in general, so now > you are back to ISA only devices, which it sounds like were the only > things already allowed by vm86 or whatever it was for passing through. > > No, it means disallowing pci devices that use shared irqs, and allowing pci devices that use non-shared irqs. > Certainly does appear to have potential though for allowing more > interesting virtual machines. > IMO pass-through is counter to most of the benefits of virtualization. But users seem to want it. -- error compiling committee.c: too many arguments to function