From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752876AbZHZS6c (ORCPT ); Wed, 26 Aug 2009 14:58:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752692AbZHZS6b (ORCPT ); Wed, 26 Aug 2009 14:58:31 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46504 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752628AbZHZS6a (ORCPT ); Wed, 26 Aug 2009 14:58:30 -0400 Message-ID: <4A9585EC.2030505@redhat.com> Date: Wed, 26 Aug 2009 21:58:52 +0300 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Lightning/1.0pre Thunderbird/3.0b3 MIME-Version: 1.0 To: Davide Libenzi CC: "Michael S. Tsirkin" , gleb@redhat.com, kvm@vger.kernel.org, Linux Kernel Mailing List Subject: Re: [PATCH 0/2] eventfd: new EFD_STATE flag References: <20090820182847.GB9282@redhat.com> <4A913DA9.1020403@redhat.com> <20090823133620.GA12841@redhat.com> <4A9146E3.2090007@redhat.com> <20090823143021.GA27495@redhat.com> <20090824214900.GA9899@redhat.com> <20090825072229.GA10608@redhat.com> <20090826102908.GA21523@redhat.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/26/2009 08:45 PM, Davide Libenzi wrote: > OK, if I get it correctly, there is one eventfd signaler (the device), and > one eventfd reader (the hypervisor), right? > Each hypervisor listens for multiple devices detecting state changes, and > associating the eventfd "line" to the IRQ number by some configuration > (ala PCI), right? > Yes. The PCI stuff happens in userspace, all the hypervisor sees is "this eventfd is IRQ 10". There may be multiple eventfds routed to one IRQ (corresponding to a shared IRQ line). -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.