Ouch, this is a wrong one, please ignore. I'll repost in a sec. On 15/06/17 15:06, 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. > > The patch 3 are based on the proposed patchset[1]. > > Changelog > v3: > - rebased on the current upstream > > 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 > > > This is based on sha1 > 63f700aab4c1 Linus Torvalds "Merge tag 'xtensa-20170612' of git://github.com/jcmvbkbc/linux-xtensa". > > Please comment. Thanks. > > > > Yongji Xie (3): > PCI: Add a new PCI_BUS_FLAGS_MSI_REMAP flag > 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 | 8 ++++++++ > drivers/vfio/pci/vfio_pci.c | 18 +++++++++++++++--- > drivers/vfio/pci/vfio_pci_rdwr.c | 3 ++- > 4 files changed, 26 insertions(+), 4 deletions(-) > -- Alexey
