From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966513AbcAZPOq (ORCPT ); Tue, 26 Jan 2016 10:14:46 -0500 Received: from mail-wm0-f44.google.com ([74.125.82.44]:34040 "EHLO mail-wm0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932442AbcAZPOn (ORCPT ); Tue, 26 Jan 2016 10:14:43 -0500 Subject: Re: [PATCH 09/10] vfio-pci: create an iommu mapping for msi address To: kbuild test robot References: <201601262259.1kktHLzi%fengguang.wu@intel.com> Cc: kbuild-all@01.org, eric.auger@st.com, alex.williamson@redhat.com, will.deacon@arm.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Bharat.Bhushan@freescale.com, pranav.sawargaonkar@gmail.com, p.fedin@samsung.com, suravee.suthikulpanit@amd.com, linux-kernel@vger.kernel.org, patches@linaro.org, iommu@lists.linux-foundation.org From: Eric Auger Message-ID: <56A78D4F.9020503@linaro.org> Date: Tue, 26 Jan 2016 16:14:23 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <201601262259.1kktHLzi%fengguang.wu@intel.com> 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 Hi, On 01/26/2016 03:43 PM, kbuild test robot wrote: > Hi Eric, > > [auto build test WARNING on v4.5-rc1] > [also build test WARNING on next-20160125] > [cannot apply to iommu/next] > [if your patch is applied to the wrong git tree, please drop us a note to help improving the system] > > url: https://github.com/0day-ci/linux/commits/Eric-Auger/KVM-PCIe-MSI-passthrough-on-ARM-ARM64/20160126-211921 > config: i386-allmodconfig (attached as .config) > reproduce: > # save the attached .config to linux build tree > make ARCH=i386 > > All warnings (new ones prefixed by >>): > > drivers/vfio/pci/vfio_pci_intrs.c: In function 'vfio_set_mapped_msi_addr': >>> drivers/vfio/pci/vfio_pci_intrs.c:324:43: warning: left shift count >= width of type [-Wshift-count-overflow] > msi_addr = (phys_addr_t)(msg.address_hi) << 32 | > ^ >>> drivers/vfio/pci/vfio_pci_intrs.c:333:34: warning: right shift count >= width of type [-Wshift-count-overflow] > msg.address_hi = (u32)(msi_iova >> 32); I definitively need to revisit that code. I Better understand Alex' comment now :-( Thanks Eric > ^ > > vim +324 drivers/vfio/pci/vfio_pci_intrs.c > > 318 dma_addr_t msi_iova; > 319 struct vfio_group *group = vdev->vfio_group; > 320 struct msi_msg msg; > 321 int ret; > 322 > 323 get_cached_msi_msg(irq, &msg); > > 324 msi_addr = (phys_addr_t)(msg.address_hi) << 32 | > 325 (phys_addr_t)(msg.address_lo); > 326 > 327 ret = vfio_group_alloc_map_reserved_iova(group, msi_addr, > 328 IOMMU_WRITE, &msi_iova); > 329 if (ret) > 330 goto out; > 331 > 332 /* Re-program the msi-address with the iova */ > > 333 msg.address_hi = (u32)(msi_iova >> 32); > 334 msg.address_lo = (u32)(msi_iova & 0xffffffff); > 335 pci_write_msi_msg(irq, &msg); > 336 > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation >