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.
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(-)
--
2.11.0
