[PATCH 0/2] vfio pci: Add support for OpenCAPI devices

[christophe lombard <clombard@linux.vnet.ibm.com>]

This series adds support for the OpenCAPI devices for vfio pci.

It builds on top of the existing ocxl driver +
http://patchwork.ozlabs.org/patch/1177999/

VFIO is a Linux kernel driver framework used by QEMU to make devices
directly assignable to virtual machines.

All OpenCAPI devices on the same PCI slot will all be grouped and
assigned to the same guest.

- Assume these are the devices you want to assign
 0007:00:00.0 Processing accelerators: IBM Device 062b
 0007:00:00.1 Processing accelerators: IBM Device 062b

- Two Devices in the group
$ ls /sys/bus/pci/devices/0007\:00\:00.0/iommu_group/devices/
 0007:00:00.0  0007:00:00.1

- Find vendor & device ID
$ lspci -n -s 0007:00:00
 0007:00:00.0 1200: 1014:062b
 0007:00:00.1 1200: 1014:062b

- Unbind from the current ocxl device driver if already loaded
$ rmmod ocxl

- Load vfio-pci if it's not already done.
$ modprobe vfio-pci

- Bind to vfio-pci
$ echo 1014 062b > /sys/bus/pci/drivers/vfio-pci/new_id

  This will result in a new device node "/dev/vfio/7", which will be
  use by QEMU to setup the devices for passthrough.

- Pass to qemu using -device vfio-pci
  -device vfio-pci,multifunction=on,host=0007:00:00.0,addr=2.0 -device
  vfio-pci,multifunction=on,host=0007:00:00.1,addr=2.1

It has been tested in a bare-metal and QEMU environment using the memcpy
and the AFP AFUs.

christophe lombard (2):
  powerpc/powernv: Register IOMMU group for OpenCAPI devices
  vfio/pci: Introduce OpenCAPI devices support.

 arch/powerpc/platforms/powernv/ocxl.c     | 164 ++++++++++---
 arch/powerpc/platforms/powernv/pci-ioda.c |  19 +-
 arch/powerpc/platforms/powernv/pci.h      |  13 +
 drivers/vfio/pci/Kconfig                  |   7 +
 drivers/vfio/pci/Makefile                 |   1 +
 drivers/vfio/pci/vfio_pci.c               |  19 ++
 drivers/vfio/pci/vfio_pci_ocxl.c          | 287 ++++++++++++++++++++++
 drivers/vfio/vfio.c                       |  25 ++
 include/linux/vfio.h                      |  13 +
 include/uapi/linux/vfio.h                 |  22 ++
 10 files changed, 530 insertions(+), 40 deletions(-)
 create mode 100644 drivers/vfio/pci/vfio_pci_ocxl.c

-- 
2.21.0