On 30/06/17 15:24, Alexey Kardashevskiy wrote: > Here is a patchset which Yongji was working on before > leaving IBM LTC. Since we still want to have this functionality > in the kernel (DPDK is the first user), here is a rebase > on the current upstream. > > > 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. > > > This is based on sha1 > 3c2bfbaadff6 Linus Torvalds "Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm". > > Please comment. Thanks. Other than that compile error, is there anything else wrong/missing in this patchset? Thanks. > > Changes: > v4: > * rebased on recent upstream > * got all 6 patches from v2 (v3 was missing some) > > > Alexey Kardashevskiy (1): > PCI: Set PCI_BUS_FLAGS_MSI_REMAP if MSI controller enables IRQ > remapping > > Yongji Xie (5): > PCI: Add a new PCI_BUS_FLAGS_MSI_REMAP flag > 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 > > include/linux/pci.h | 1 + > arch/powerpc/platforms/powernv/pci-ioda.c | 7 +++++++ > drivers/iommu/iommu.c | 8 ++++++++ > drivers/pci/probe.c | 8 ++++++++ > drivers/vfio/pci/vfio_pci.c | 17 ++++++++++++++--- > drivers/vfio/pci/vfio_pci_rdwr.c | 3 ++- > 6 files changed, 40 insertions(+), 4 deletions(-) > -- Alexey
