From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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 v3 5/5] vfio-pci: Allow to mmap MSI-X table if host bridge supports filtering of MSIs Date: Fri, 15 Jan 2016 15:06:14 +0800 Message-Id: <1452841574-2781-6-git-send-email-xyjxie@linux.vnet.ibm.com> In-Reply-To: <1452841574-2781-1-git-send-email-xyjxie@linux.vnet.ibm.com> References: <1452841574-2781-1-git-send-email-xyjxie@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 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 the PCI host bridge supports filtering of MSIs. Signed-off-by: Yongji Xie --- drivers/vfio/pci/vfio_pci.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index 11fd0f0..4d68f6a 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -555,7 +555,8 @@ 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 (!pci_host_bridge_msi_filtered_enabled(pdev) && + info.index == vdev->msix_bar) { ret = msix_sparse_mmap_cap(vdev, &caps); if (ret) return ret; @@ -967,7 +968,8 @@ 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 (!pci_host_bridge_msi_filtered_enabled(pdev) && + index == vdev->msix_bar) { /* * Disallow mmaps overlapping the MSI-X table; users don't * get to touch this directly. We could find somewhere -- 1.7.9.5