From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yongji Xie Subject: [PATCH 0/5] vfio-pci: Add support for mmapping MSI-X table Date: Wed, 27 Apr 2016 20:43:25 +0800 Message-ID: <1461761010-5452-1-git-send-email-xyjxie@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Cc: alistair-Y4h6yKqj69EXC2x5gXVKYQ@public.gmane.org, nikunj-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, zhong-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, eric.auger-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, aik-sLpHqDYs0B2HXe+LvDLADg@public.gmane.org, mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org, ruscur-3Su/lFKaw5ejKv3TNrM5DQ@public.gmane.org, will.deacon-5wv7dgnIgG8@public.gmane.org, gwshan-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, warrier-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, David.Laight-ZS65k/vG3HxXrIkS9f7CXA@public.gmane.org, paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org, benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org, bhelgaas-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, Yongji Xie List-Id: iommu@lists.linux-foundation.org Current vfio-pci implementation disallows to mmap the page containing MSI-X table in case that users can write to MSI-X table and generate an incorrect MSIs. However, this will cause some performance issue when there are some critical device registers in the same page as the MSI-X table. We have to handle the mmio access to these registers in QEMU emulation rather than in guest. To solve this issue, this series allows to mmap MSI-X table when hardware supports the capability of interrupt remapping which can ensure that a given pci device can only shoot the MSIs assigned for it. And we introduce a new bus_flags PCI_BUS_FLAGS_MSI_REMAP to test this capability on PCI side for different archs. The patch 3 are based on the proposed patchset[1]. [1] http://www.spinics.net/lists/kvm/msg130256.html Yongji Xie (5): PCI: Add a new PCI_BUS_FLAGS_MSI_REMAP flag iommu: Set PCI_BUS_FLAGS_MSI_REMAP if IOMMU have capability of IRQ remapping PCI: Set PCI_BUS_FLAGS_MSI_REMAP if MSI controller supports IRQ remapping pci-ioda: Set PCI_BUS_FLAGS_MSI_REMAP for IODA host bridge vfio-pci: Allow to mmap MSI-X table if interrupt remapping is supported arch/powerpc/platforms/powernv/pci-ioda.c | 8 ++++++++ drivers/iommu/iommu.c | 15 +++++++++++++++ drivers/pci/msi.c | 12 ++++++++++++ drivers/pci/probe.c | 3 +++ drivers/vfio/pci/vfio_pci.c | 7 +++++-- drivers/vfio/pci/vfio_pci_rdwr.c | 3 ++- include/linux/msi.h | 6 +++++- include/linux/pci.h | 1 + 8 files changed, 51 insertions(+), 4 deletions(-) -- 1.7.9.5