Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752483AbcCGHuH (ORCPT ); Mon, 7 Mar 2016 02:50:07 -0500 Received: from e28smtp03.in.ibm.com ([125.16.236.3]:57932 "EHLO e28smtp03.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752450AbcCGHt4 (ORCPT ); Mon, 7 Mar 2016 02:49:56 -0500 X-IBM-Helo: d28relay03.in.ibm.com X-IBM-MailFrom: xyjxie@linux.vnet.ibm.com X-IBM-RcptTo: linux-doc@vger.kernel.org;linux-pci@vger.kernel.org;linux-kernel@vger.kernel.org;kvm@vger.kernel.org From: Yongji Xie To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-doc@vger.kernel.org Cc: bhelgaas@google.com, corbet@lwn.net, aik@ozlabs.ru, alex.williamson@redhat.com, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, warrier@linux.vnet.ibm.com, zhong@linux.vnet.ibm.com, nikunj@linux.vnet.ibm.com, Yongji Xie Subject: [RFC PATCH v4 6/7] vfio-pci: Allow to mmap MSI-X table if IOMMU_CAP_INTR_REMAP was set Date: Mon, 7 Mar 2016 15:48:37 +0800 Message-Id: <1457336918-3893-7-git-send-email-xyjxie@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1457336918-3893-1-git-send-email-xyjxie@linux.vnet.ibm.com> References: <1457336918-3893-1-git-send-email-xyjxie@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 16030707-0009-0000-0000-00000AF97B4D Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2263 Lines: 68 Current vfio-pci implementation disallows to mmap MSI-X table in case that user get to touch this directly. But we should allow to mmap these MSI-X tables if IOMMU supports interrupt remapping which can ensure that a given pci device can only shoot the MSIs assigned for it. Signed-off-by: Yongji Xie --- drivers/vfio/pci/vfio_pci.c | 8 +++++--- drivers/vfio/pci/vfio_pci_rdwr.c | 4 +++- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index 49d7a69..d6f4788 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -592,13 +592,14 @@ static long vfio_pci_ioctl(void *device_data, IORESOURCE_MEM && !pci_resources_share_page(pdev, info.index)) { info.flags |= VFIO_REGION_INFO_FLAG_MMAP; - if (info.index == vdev->msix_bar) { + if (!iommu_capable(pdev->dev.bus, + IOMMU_CAP_INTR_REMAP) && + info.index == vdev->msix_bar) { ret = msix_sparse_mmap_cap(vdev, &caps); if (ret) return ret; } } - break; case VFIO_PCI_ROM_REGION_INDEX: { @@ -1029,7 +1030,8 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) if (phys_len < PAGE_SIZE || req_start + req_len > phys_len) return -EINVAL; - if (index == vdev->msix_bar) { + if (!iommu_capable(pdev->dev.bus, IOMMU_CAP_INTR_REMAP) && + index == vdev->msix_bar) { /* * Disallow mmaps overlapping the MSI-X table; users don't * get to touch this directly. We could find somewhere diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c index 5ffd1d9..1c46c29 100644 --- a/drivers/vfio/pci/vfio_pci_rdwr.c +++ b/drivers/vfio/pci/vfio_pci_rdwr.c @@ -18,6 +18,7 @@ #include #include #include +#include #include "vfio_pci_private.h" @@ -164,7 +165,8 @@ ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf, } else io = vdev->barmap[bar]; - if (bar == vdev->msix_bar) { + if (!iommu_capable(pdev->dev.bus, IOMMU_CAP_INTR_REMAP) && + bar == vdev->msix_bar) { x_start = vdev->msix_offset; x_end = vdev->msix_offset + vdev->msix_size; } -- 1.7.9.5