Re: [PATCH v11 00/22] Add Mediated device support

[Kirti Wankhede <kwankhede@nvidia.com>]

Verified that this patch series gets applied cleanly to Linux-next upto:
bc33b0ca11e3 Linux 4.9-rc4

Also tested this patch series with above kernel.

Thanks,
Kirti

On 11/7/2016 9:29 AM, Kirti Wankhede wrote:
> 
> 
> On 11/7/2016 9:00 AM, Alexey Kardashevskiy wrote:
>> On 05/11/16 08:10, Kirti Wankhede wrote:
>>> 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 in v11?
>>> mdev core:
>>>   Register mdev_bus class when first device is registed to avoid panic if
>>>   any vendor driver and mdev driver are selected as built-in but vendor
>>>   driver loads first and then mdev module.
>>> vfio_mdev:
>>>   Added notifier callback function to mdev parent's ops so that notifer
>>>   is registered from vfio_mdev module during device open and unregistered
>>>   it from device close call. This is a optional callback. Some drivers
>>>   using mdev framework might not pin or unpin pages, for example the
>>>   sample mtty driver that simulates serial port. Vendor driver who need to
>>>   pin/unpin pages should provide this callback. Otherwise pin request
>>>   would fail.
>>> vfio_iommu_type1:
>>>   Updated to keep track of who (task and address space) mapped iova range.
>>>   During DMA_UNMAP, same task who mapped it or other task who shares same
>>>   address space is allowed to unmap, otherwise unmap fails.
>>>   QEMU maps few iova ranges initially, then fork threads and from the child
>>>   thread calls DMA_UNMAP on previously mapped iova. Since child shares same
>>>   address space, DMA_UNMAP is successful.
>>>   Address space keeps track of pages pinned (pfn_list) by external user /
>>>   mdev devices. This pfn_list is used to verify pfn during unpin_request,
>>>   re-accounting of pages when direct device assigned in hot-unplugged and
>>>   mdev device is present in same container.
>>>   When the container is released, all mapped iova from all tasks are
>>>   unmapped and removed.
>>>
>>>   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
>>>
>>>   Patch series tested with linux-next upto commit 14970f204b19 @Fri Oct 28
>>>   Resolved against conflicting change:
>>
>> Patch 11/22 does not apply if the patchset is applied on top of 14970f204b19.
>>
>>
> 
> Pull commit 05692d7005a3 (below) commit.
> 
>>
>>>   05692d7005a3 vfio/pci: Fix integer overflows, bitmask check
>>>
> 
> Thanks,
> Kirti
> 
>>>
>>> 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                 |  388 +++++++
>>>  drivers/vfio/mdev/mdev_driver.c               |  122 ++
>>>  drivers/vfio/mdev/mdev_private.h              |   41 +
>>>  drivers/vfio/mdev/mdev_sysfs.c                |  286 +++++
>>>  drivers/vfio/mdev/vfio_mdev.c                 |  167 +++
>>>  drivers/vfio/pci/vfio_pci.c                   |   83 +-
>>>  drivers/vfio/platform/vfio_platform_common.c  |   31 +-
>>>  drivers/vfio/vfio.c                           |  334 +++++-
>>>  drivers/vfio/vfio_iommu_type1.c               |  831 ++++++++++++--
>>>  include/linux/mdev.h                          |  176 +++
>>>  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, 4342 insertions(+), 218 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
>>>
>>
>>