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

Nicolin Chen
2022-10-31T09:39:59Z

On Tue, Oct 25, 2022 at 03:17:06PM -0300, 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

Tested-by: Nicolin Chen <nicoleotsuka@nvidia.com>

Tested this branch on ARM64+SMMUv3 with the iommufd selftest and
QEMU passthrough sanity using noiommu and virtio-iommu setups by
combining with both CONFIG_VFIO_CONTAINER=y and =n.