Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759046AbcDENsu (ORCPT ); Tue, 5 Apr 2016 09:48:50 -0400 Received: from e23smtp03.au.ibm.com ([202.81.31.145]:47905 "EHLO e23smtp03.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759020AbcDENsq (ORCPT ); Tue, 5 Apr 2016 09:48:46 -0400 X-IBM-Helo: d23dlp01.au.ibm.com X-IBM-MailFrom: xyjxie@linux.vnet.ibm.com X-IBM-RcptTo: kvm@vger.kernel.org;linux-doc@vger.kernel.org;linux-kernel@vger.kernel.org;linux-pci@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, eric.auger@linaro.org, will.deacon@arm.com, gwshan@linux.vnet.ibm.com, alistair@popple.id.au, ruscur@russell.cc, Yongji Xie Subject: [RFC v5 7/7] vfio-pci: Allow to mmap MSI-X table if interrupt remapping is supported Date: Tue, 5 Apr 2016 21:46:44 +0800 Message-Id: <1459864004-2869-2-git-send-email-xyjxie@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1459864004-2869-1-git-send-email-xyjxie@linux.vnet.ibm.com> References: <1459864004-2869-1-git-send-email-xyjxie@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16040513-0009-0000-0000-000006B93A20 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2568 Lines: 73 This patch enables mmapping MSI-X tables if hardware 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 | 9 +++++++-- drivers/vfio/pci/vfio_pci_private.h | 1 + drivers/vfio/pci/vfio_pci_rdwr.c | 2 +- 3 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index c60d790..ef02896 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -201,6 +201,10 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev) } else vdev->msix_bar = 0xFF; + if (iommu_capable(pdev->dev.bus, IOMMU_CAP_INTR_REMAP) || + pdev->bus->bus_flags | PCI_BUS_FLAGS_MSI_REMAP) + vdev->msi_remap = true; + if (!vfio_vga_disabled() && vfio_pci_is_vga(pdev)) vdev->has_vga = true; @@ -635,7 +639,8 @@ static long vfio_pci_ioctl(void *device_data, VFIO_REGION_INFO_FLAG_WRITE; if (vdev->bar_mmap_supported[info.index]) { info.flags |= VFIO_REGION_INFO_FLAG_MMAP; - if (info.index == vdev->msix_bar) { + if (info.index == vdev->msix_bar && + !vdev->msi_remap) { ret = msix_sparse_mmap_cap(vdev, &caps); if (ret) return ret; @@ -1067,7 +1072,7 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma) if (req_start + req_len > phys_len) return -EINVAL; - if (index == vdev->msix_bar) { + if (index == vdev->msix_bar && !vdev->msi_remap) { /* * 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_private.h b/drivers/vfio/pci/vfio_pci_private.h index 0ea4c62..4f20963 100644 --- a/drivers/vfio/pci/vfio_pci_private.h +++ b/drivers/vfio/pci/vfio_pci_private.h @@ -78,6 +78,7 @@ struct vfio_pci_device { int irq_type; int num_regions; struct vfio_pci_region *region; + bool msi_remap; u8 msi_qmax; u8 msix_bar; u16 msix_size; diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c index 5ffd1d9..606ee3c 100644 --- a/drivers/vfio/pci/vfio_pci_rdwr.c +++ b/drivers/vfio/pci/vfio_pci_rdwr.c @@ -164,7 +164,7 @@ 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 (bar == vdev->msix_bar && !vdev->msi_remap) { x_start = vdev->msix_offset; x_end = vdev->msix_offset + vdev->msix_size; } -- 1.7.9.5