[PATCH v14 00/22] Add Mediated device support

[Kirti Wankhede]

This series adds Mediated device support to Linux host kernel. Purpose
of this series is to provide a common interface for mediated device
management that can be used by different devices. This series introduces
Mdev core module that creates and manages mediated devices, VFIO based
driver for mediated devices that are created by mdev core module and
update VFIO type1 IOMMU module to support pinning & unpinning for mediated
devices.

What changed v13-> v14?
- Added retries to notify DMA_UNMAP, if pfn_list is not empty.
- Added BUG_ON if pages are not unpined during DMA_UNMAP after 10 retries.
- Removed unpinning from detach_group() and release() and added WARN_ON
  if pfn_list is not empty.
- Updated page accounting logic.

Tested by assigning below combinations of devices to a single VM:
- GPU pass through only
- vGPU device only
- One GPU pass through and one vGPU device
- Linux VM hot plug and unplug vGPU device while GPU pass through device
  exist
- Linux VM hot plug and unplug GPU pass through device while vGPU device
  exist

Tested with Linux-next upto commit e76d21c40bd6.

Kirti Wankhede (22):
  vfio: Mediated device Core driver
  vfio: VFIO based driver for Mediated devices
  vfio: Rearrange functions to get vfio_group from dev
  vfio: Common function to increment container_users
  vfio iommu: Added pin and unpin callback functions to
    vfio_iommu_driver_ops
  vfio iommu type1: Update arguments of vfio_lock_acct
  vfio iommu type1: Update argument of vaddr_get_pfn()
  vfio iommu type1: Add find_iommu_group() function
  vfio iommu type1: Add task structure to vfio_dma
  vfio iommu type1: Add support for mediated devices
  vfio iommu: Add blocking notifier to notify DMA_UNMAP
  vfio: Add notifier callback to parent's ops structure of mdev
  vfio: Introduce common function to add capabilities
  vfio_pci: Update vfio_pci to use vfio_info_add_capability()
  vfio: Introduce vfio_set_irqs_validate_and_prepare()
  vfio_pci: Updated to use vfio_set_irqs_validate_and_prepare()
  vfio_platform: Updated to use vfio_set_irqs_validate_and_prepare()
  vfio: Define device_api strings
  docs: Add Documentation for Mediated devices
  docs: Sysfs ABI for mediated device framework
  docs: Sample driver to demonstrate how to use Mediated device
    framework.
  MAINTAINERS: Add entry VFIO based Mediated device drivers

 Documentation/ABI/testing/sysfs-bus-vfio-mdev |  111 ++
 Documentation/vfio-mediated-device.txt        |  399 +++++++
 MAINTAINERS                                   |    9 +
 drivers/vfio/Kconfig                          |    1 +
 drivers/vfio/Makefile                         |    1 +
 drivers/vfio/mdev/Kconfig                     |   17 +
 drivers/vfio/mdev/Makefile                    |    5 +
 drivers/vfio/mdev/mdev_core.c                 |  385 +++++++
 drivers/vfio/mdev/mdev_driver.c               |  119 ++
 drivers/vfio/mdev/mdev_private.h              |   41 +
 drivers/vfio/mdev/mdev_sysfs.c                |  286 +++++
 drivers/vfio/mdev/vfio_mdev.c                 |  180 +++
 drivers/vfio/pci/vfio_pci.c                   |   83 +-
 drivers/vfio/platform/vfio_platform_common.c  |   31 +-
 drivers/vfio/vfio.c                           |  340 +++++-
 drivers/vfio/vfio_iommu_type1.c               |  872 +++++++++++---
 include/linux/mdev.h                          |  177 +++
 include/linux/vfio.h                          |   32 +-
 include/uapi/linux/vfio.h                     |   10 +
 samples/vfio-mdev/Makefile                    |   13 +
 samples/vfio-mdev/mtty.c                      | 1503 +++++++++++++++++++++++++
 21 files changed, 4358 insertions(+), 257 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-vfio-mdev
 create mode 100644 Documentation/vfio-mediated-device.txt
 create mode 100644 drivers/vfio/mdev/Kconfig
 create mode 100644 drivers/vfio/mdev/Makefile
 create mode 100644 drivers/vfio/mdev/mdev_core.c
 create mode 100644 drivers/vfio/mdev/mdev_driver.c
 create mode 100644 drivers/vfio/mdev/mdev_private.h
 create mode 100644 drivers/vfio/mdev/mdev_sysfs.c
 create mode 100644 drivers/vfio/mdev/vfio_mdev.c
 create mode 100644 include/linux/mdev.h
 create mode 100644 samples/vfio-mdev/Makefile
 create mode 100644 samples/vfio-mdev/mtty.c

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2.7.0