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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
