From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: assign-dev: Purpose of interrupt_work Date: Mon, 12 Oct 2009 11:14:34 +0200 Message-ID: <4AD2F37A.3060600@redhat.com> References: <4AD2D4B6.7030203@web.de> <20091012071310.GT16702@redhat.com> <4AD2DA57.6030006@web.de> <20091012074513.GV16702@redhat.com> <4AD2DFE2.4050406@web.de> <20091012075715.GW16702@redhat.com> <4AD2E5F8.4070107@web.de> <20091012083913.GX16702@redhat.com> <4AD2F117.7000403@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Gleb Natapov , kvm-devel To: Jan Kiszka Return-path: Received: from mx1.redhat.com ([209.132.183.28]:33754 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751410AbZJLJPD (ORCPT ); Mon, 12 Oct 2009 05:15:03 -0400 In-Reply-To: <4AD2F117.7000403@web.de> Sender: kvm-owner@vger.kernel.org List-ID: On 10/12/2009 11:04 AM, Jan Kiszka wrote: >> I'd rather remove dev-passthrough completely than continue adding hack upon hack >> upon hack to make is some times kinda sorta work :) >> > Hmm, is this code not needed for the VT-d& Co. case? It is needed. > Or what is the > alternative? > irqfd (which only supports edge-triggered interrupts now). Note irqfd needs the same love, it uses a workqueue as well. The theory is: fd1 = eventfd() give fd1 to kvm as irqfd, vhost-net as trigger fd fd2 = eventfd() give fd2 to kvm as irqfd, uio as trigger fd fd3 = evenfd() give fd3 to kvm as irqfd, another kvm as ioeventfd One interface, multiple users (in the kernel, userspace, or other processes) -- error compiling committee.c: too many arguments to function