Hi Yongji,

Le 02/06/2016 à 08:09, Yongji Xie a écrit :

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].

You may have noticed I sent a respin of [1] yesterday:
http://www.gossamer-threads.com/lists/linux/kernel/2455187.

Unfortunately you will see I removed the patch defining the new
msi_domain_info MSI_FLAG_IRQ_REMAPPING flag you rely on in this series.
I did so because I was not using it anymore. At the beginning this was
used to detect whether the MSI assignment was safe but this
method was covering cases where the MSI controller was
upstream to the IOMMU. So now I rely on a mechanism where MSI controller
are supposed to register their MSI doorbells and tag whether it is safe.

I don't know yet how this change will be welcomed though. Depending
on reviews/discussions, might happen we revert to the previous flag.

If you need the feature you can embed the used patches in your series and
follow the review process separately. Sorry for the setback.

Best Regards

Eric

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(-)