AFAICT, you posted this *3* days ago, has something changed here or is this just expedited nagging for review? This also depends on a non-upstream series and crosses multiple functional areas, all of which make it difficult for maintainers to actually do anything with this series. Thanks, Alex On Thu, 2 Jun 2016 14:09:57 +0800 Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx> wrote: > Current vfio-pci implementation disallows to mmap the page > containing MSI-X table in case that users can write directly > 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 expose MSI-X table > to userspace when hardware enables 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]. > > Changelog v2: > - Make the commit log more clear > - Replace pci_bus_check_msi_remapping() with pci_bus_msi_isolated() > so that we could clearly know what the function does > - Set PCI_BUS_FLAGS_MSI_REMAP in pci_create_root_bus() instead > of iommu_bus_notifier() > - Reserve VFIO_REGION_INFO_FLAG_CAPS when we allow to mmap MSI-X > table so that we can know whether we allow to mmap MSI-X table > in QEMU > > [1] https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg1138820.html > > Yongji Xie (6): > PCI: Add a new PCI_BUS_FLAGS_MSI_REMAP flag > PCI: Set PCI_BUS_FLAGS_MSI_REMAP if MSI controller enables IRQ remapping > PCI: Set PCI_BUS_FLAGS_MSI_REMAP if IOMMU have capability of IRQ remapping > iommu: Set PCI_BUS_FLAGS_MSI_REMAP on iommu driver initialization > pci-ioda: Set PCI_BUS_FLAGS_MSI_REMAP for IODA host bridge > vfio-pci: Allow to expose MSI-X table to userspace if interrupt remapping is enabled > > arch/powerpc/platforms/powernv/pci-ioda.c | 8 ++++++++ > drivers/iommu/iommu.c | 8 ++++++++ > drivers/pci/msi.c | 15 +++++++++++++++ > drivers/pci/probe.c | 7 +++++++ > drivers/vfio/pci/vfio_pci.c | 17 ++++++++++++++--- > drivers/vfio/pci/vfio_pci_rdwr.c | 3 ++- > include/linux/msi.h | 5 ++++- > include/linux/pci.h | 1 + > 8 files changed, 59 insertions(+), 5 deletions(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
