Re: [RFC 0/8] iommufd: Enable noiommu mode for cdev

[Jason Gunthorpe]

On Mon, Dec 01, 2025 at 09:30:04AM -0800, Jacob Pan wrote:
> VFIO's unsafe_noiommu_mode has long provided a way for userspace drivers
> to operate on platforms lacking a hardware IOMMU. Today, IOMMUFD also
> supports No-IOMMU mode for group based devices under vfio_compat mode.
> However, IOMMUFD's native character device (cdev) does not yet implement
> No-IOMMU mode, which is the purpose of this patch. In summary, we have:

I tried to build this without the fake iommu driver and it worked out OK:

https://github.com/jgunthorpe/linux/commits/iommufd_noiommu/

Needs a little more checking than I might have done, but can you take
that and try for a submission?

Thanks,
Jason