[Intel-gfx] [PATCH 00/10] Connect VFIO to IOMMUFD

[Yi Liu]

Hi Jason,

On 2022/10/26 02:17, Jason Gunthorpe wrote:
> This series provides an alternative container layer for VFIO implemented
> using iommufd. This is optional, if CONFIG_IOMMUFD is not set then it will
> not be compiled in.
> 
> At this point iommufd can be injected by passing in a iommfd FD to
> VFIO_GROUP_SET_CONTAINER which will use the VFIO compat layer in iommufd
> to obtain the compat IOAS and then connect up all the VFIO drivers as
> appropriate.
> 
> This is temporary stopping point, a following series will provide a way to
> directly open a VFIO device FD and directly connect it to IOMMUFD using
> native ioctls that can expose the IOMMUFD features like hwpt, future
> vPASID and dynamic attachment.
> 
> This series, in compat mode, has passed all the qemu tests we have
> available, including the test suites for the Intel GVT mdev. Aside from
> the temporary limitation with P2P memory this is belived to be fully
> compatible with VFIO.
> 
> This is on github: https://github.com/jgunthorpe/linux/commits/vfio_iommufd

In our side, we found the gvt-g test failed. Guest i915 driver stuck at
init phase. While with your former version  (commit ID 
a249441ba6fd9d658f4a1b568453e3a742d12686), gvt-g test is passing. I
noticed there a quite a few change in iommufd/pages.c from last version.
We are internally tracing in the gvt-g side, may also good to have your
attention.

> It requires the iommufd series:
> 
> https://lore.kernel.org/r/0-v3-402a7d6459de+24b-iommufd_jgg@nvidia.com
> 
> Jason Gunthorpe (10):
>    vfio: Move vfio_device driver open/close code to a function
>    vfio: Move vfio_device_assign_container() into
>      vfio_device_first_open()
>    vfio: Rename vfio_device_assign/unassign_container()
>    vfio: Move storage of allow_unsafe_interrupts to vfio_main.c
>    vfio: Use IOMMU_CAP_ENFORCE_CACHE_COHERENCY for
>      vfio_file_enforced_coherent()
>    vfio-iommufd: Allow iommufd to be used in place of a container fd
>    vfio-iommufd: Support iommufd for physical VFIO devices
>    vfio-iommufd: Support iommufd for emulated VFIO devices
>    vfio: Make vfio_container optionally compiled
>    iommufd: Allow iommufd to supply /dev/vfio/vfio
> 
>   drivers/gpu/drm/i915/gvt/kvmgt.c              |   3 +
>   drivers/iommu/iommufd/Kconfig                 |  12 +
>   drivers/iommu/iommufd/main.c                  |  35 +-
>   drivers/s390/cio/vfio_ccw_ops.c               |   3 +
>   drivers/s390/crypto/vfio_ap_ops.c             |   3 +
>   drivers/vfio/Kconfig                          |  38 ++-
>   drivers/vfio/Makefile                         |   5 +-
>   drivers/vfio/container.c                      | 136 ++------
>   drivers/vfio/fsl-mc/vfio_fsl_mc.c             |   3 +
>   drivers/vfio/iommufd.c                        | 161 +++++++++
>   .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c    |   6 +
>   drivers/vfio/pci/mlx5/main.c                  |   3 +
>   drivers/vfio/pci/vfio_pci.c                   |   3 +
>   drivers/vfio/platform/vfio_amba.c             |   3 +
>   drivers/vfio/platform/vfio_platform.c         |   3 +
>   drivers/vfio/vfio.h                           | 100 +++++-
>   drivers/vfio/vfio_iommu_type1.c               |   5 +-
>   drivers/vfio/vfio_main.c                      | 318 ++++++++++++++----
>   include/linux/vfio.h                          |  39 +++
>   19 files changed, 681 insertions(+), 198 deletions(-)
>   create mode 100644 drivers/vfio/iommufd.c
> 
> 
> base-commit: 3bec937e94942a6aee8854be1c1f5cc2b92d15e2

-- 
Regards,
Yi Liu