From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [RFC PATCH] kvm: Extend irqfd to support level interrupts Date: Mon, 18 Jun 2012 13:14:13 +0300 Message-ID: <4FDEFF75.6060104@redhat.com> References: <20120616163230.15204.61075.stgit@bling.home> <4FDEE0A3.80900@redhat.com> <4FDEEC52.8080806@siemens.com> <4FDEF5CD.8090806@redhat.com> <20120618101156.GB23134@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Jan Kiszka , Alex Williamson , "mtosatti@redhat.com" , "kvm@vger.kernel.org" To: "Michael S. Tsirkin" Return-path: Received: from mx1.redhat.com ([209.132.183.28]:19070 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751765Ab2FRKOS (ORCPT ); Mon, 18 Jun 2012 06:14:18 -0400 In-Reply-To: <20120618101156.GB23134@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On 06/18/2012 01:11 PM, Michael S. Tsirkin wrote: >> (vhost, >> msi-less ivshmem clone)? > > I guess vhost can poll eventfd and reinject an interrupt. > Of course to bypass qemu completely we also need to support reads over > ioeventfd somehow. > eventfd is not suitable for level triggered interrupts as far as I can tell. It's about passing edges, and level interrupts aren't. We need something like a pipe for communicating state (or just use KVM_IRQ_LINE). -- error compiling committee.c: too many arguments to function