Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758439Ab0DAQjz (ORCPT ); Thu, 1 Apr 2010 12:39:55 -0400 Received: from mx1.redhat.com ([209.132.183.28]:64426 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757986Ab0DAQjs (ORCPT ); Thu, 1 Apr 2010 12:39:48 -0400 Message-ID: <4BB4C591.8000102@redhat.com> Date: Thu, 01 Apr 2010 19:10:57 +0300 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100301 Fedora/3.0.3-1.fc12 Thunderbird/3.0.3 MIME-Version: 1.0 To: Tom Lyon CC: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes References: <201003311708.38961.pugs@lyon-about.com> <201004010839.07451.pugs@lyon-about.com> <4BB4C1A6.8050904@redhat.com> <201004010906.47321.pugs@lyon-about.com> In-Reply-To: <201004010906.47321.pugs@lyon-about.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1266 Lines: 38 On 04/01/2010 07:06 PM, Tom Lyon wrote: > On Thursday 01 April 2010 08:54:14 am Avi Kivity wrote: > >> On 04/01/2010 06:39 PM, Tom Lyon wrote: >> >>>>> - support for MSI and MSI-X interrupts (the intel 82599 VFs support >>>>> only MSI-X) >>>>> >>>> How does a userspace program receive those interrupts? >>>> >>> Same as other UIO drivers - by read()ing an event counter. >>> >> IIRC the usual event counter is /dev/uioX, what's your event counter now? >> > Exact same mechanism. > But there are multiple msi-x interrupts, how do you know which one triggered? >> kvm really wants the event counter to be an eventfd, that allows hooking >> it directly to kvm (which can inject an interrupt on an eventfd_signal), >> can you adapt your patch to do this? >> > My patch does not currently go anywhere near the read/fd logic of /dev/uioX. > I think a separate patch would be appropriate. > Sure. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/