linux-kernel - Re: [PATCH v10 00/19] Add Mediated device support

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Date:   Tue, 01 Nov 2016 16:32:39 +0800
From:   Jike Song <jike.song@...el.com>
To:     Kirti Wankhede <kwankhede@...dia.com>
CC:     alex.williamson@...hat.com, pbonzini@...hat.com, kraxel@...hat.com,
        cjia@...dia.com, qemu-devel@...gnu.org, kvm@...r.kernel.org,
        kevin.tian@...el.com, bjsdjshi@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 00/19] Add Mediated device support

On 10/27/2016 05:29 AM, 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 v10?
> vfio:
>  - Split commits in multple individual commits.
>  - Removed the function added in v9 to get device_api string.
>  - Defined constant strings in include/uapi/linux/vfio.h that should be used by
>    vendor driver for device_api attribute.
> 
> vfio_iommu_type1:
>  - Fixed accounting when pass through device is unplugged while mdev device
>    exist in a domain.
>  - Added blocking notifier to notify DMA_UNMAP to vendor driver to invalidate
>    mappings.
>  - Exported APIs to register notifier for DMA_UNMAP action.
> 
> Documentation:
>  - Added sysfs ABI for mediated device framework.
>  - Updated Documentation/vfio-mdev/vfio-mediated-device.txt.
>  - Updated mtty.c with bug fixes.
> 
> Kirti Wankhede (19):
>   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 support for mediated devices
>   vfio iommu: Add blocking notifier to notify DMA_UNMAP
>   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.
> 
>  Documentation/ABI/testing/sysfs-bus-vfio-mdev    |  111 ++
>  Documentation/vfio-mdev/Makefile                 |   13 +
>  Documentation/vfio-mdev/mtty.c                   | 1503 ++++++++++++++++++++++
>  Documentation/vfio-mdev/vfio-mediated-device.txt |  398 ++++++
>  drivers/vfio/Kconfig                             |    1 +
>  drivers/vfio/Makefile                            |    1 +
>  drivers/vfio/mdev/Kconfig                        |   17 +
>  drivers/vfio/mdev/Makefile                       |    5 +
>  drivers/vfio/mdev/mdev_core.c                    |  384 ++++++
>  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                    |  148 +++
>  drivers/vfio/pci/vfio_pci.c                      |   78 +-
>  drivers/vfio/platform/vfio_platform_common.c     |   31 +-
>  drivers/vfio/vfio.c                              |  322 ++++-
>  drivers/vfio/vfio_iommu_type1.c                  |  808 ++++++++++--
>  include/linux/mdev.h                             |  167 +++
>  include/linux/vfio.h                             |   30 +-
>  include/uapi/linux/vfio.h                        |   10 +
>  20 files changed, 4270 insertions(+), 206 deletions(-)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-vfio-mdev
>  create mode 100644 Documentation/vfio-mdev/Makefile
>  create mode 100644 Documentation/vfio-mdev/mtty.c
>  create mode 100644 Documentation/vfio-mdev/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

A side note:

I rebased KVMGT upon v10, with 2 minor changes:

	1, get_user_pages_remote has only 7 args
	2, vfio iommu notifier calls vendor callback with iova instead of pfn

so far it works pretty well. Thanks!

--
Thanks,
Jike