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

[Jacob Pan]

Hi Jason,

On Fri, 30 Jan 2026 15:35:29 -0400
Jason Gunthorpe <jgg@xxxxxxxxxx> wrote:

> 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?
> 
Will look into it.

Thanks

Jacob