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

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Message-ID: <20260206145004.000010e1@linux.microsoft.com>
Date: Fri, 6 Feb 2026 14:50:04 -0800
From: Jacob Pan <jacob.pan@...ux.microsoft.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: linux-kernel@...r.kernel.org, "iommu@...ts.linux.dev"
 <iommu@...ts.linux.dev>, Alex Williamson <alex.williamson@...hat.com>,
 Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, Robin Murphy
 <robin.murphy@....com>, Nicolin Chen <nicolinc@...dia.com>, "Tian, Kevin"
 <kevin.tian@...el.com>, "Liu, Yi L" <yi.l.liu@...el.com>,
 skhawaja@...gle.com, pasha.tatashin@...een.com, Zhang Yu
 <zhangyu1@...ux.microsoft.com>, Jean Philippe-Brucker
 <jean-philippe@...aro.org>, David Matlack <dmatlack@...gle.com>
Subject: Re: [RFC 0/8] iommufd: Enable noiommu mode for cdev

Hi Jason,

On Fri, 30 Jan 2026 15:35:29 -0400
Jason Gunthorpe <jgg@...dia.com> 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