From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756385AbbIUJcU (ORCPT ); Mon, 21 Sep 2015 05:32:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35028 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752391AbbIUJcT (ORCPT ); Mon, 21 Sep 2015 05:32:19 -0400 Subject: Re: [PATCH v9 12/18] vfio: Register/unregister irq_bypass_producer To: "Wu, Feng" , "alex.williamson@redhat.com" , "joro@8bytes.org" , "mtosatti@redhat.com" References: <1442586596-5920-1-git-send-email-feng.wu@intel.com> <1442586596-5920-13-git-send-email-feng.wu@intel.com> Cc: "eric.auger@linaro.org" , "kvm@vger.kernel.org" , "iommu@lists.linux-foundation.org" , "linux-kernel@vger.kernel.org" From: Paolo Bonzini Message-ID: <55FFCE9F.5090001@redhat.com> Date: Mon, 21 Sep 2015 11:32:15 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/09/2015 10:56, Wu, Feng wrote: > Hi Paolo & Alex, > > I find that there is a build error in the following two cases: > - KVM is configured as 'M' and VFIO as 'Y' > The reason is the build of irqbypass manager is triggered in > arch/x86/kvm/Makefile, and VFIO is built before KVM, hence > it cannot find the symbols in irqbypass manager. > > - Disable KVM and enable VFIO in .config > The reason is similar with the above one, the irqbypass manager > is not built since KVM is not configured. > > I think the point is that we cannot trigger the build of irqbypass > manager inside KVM or VFIO, we need trigger the build at a high > level and it should be built before VFIO and KVM. Any ideas? We can add virt/Makefile and build virt/lib/ directly, not through arch/x86/kvm. Paolo