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From: Jason Gunthorpe <jgg@nvidia.com>
To: Jacob Pan <jacob.pan@linux.microsoft.com>
Cc: linux-kernel@vger.kernel.org,
	"iommu@lists.linux.dev" <iommu@lists.linux.dev>,
	Alex Williamson <alex.williamson@redhat.com>,
	Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Nicolin Chen <nicolinc@nvidia.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	"Liu, Yi L" <yi.l.liu@intel.com>,
	skhawaja@google.com, pasha.tatashin@soleen.com,
	Zhang Yu <zhangyu1@linux.microsoft.com>,
	Jean Philippe-Brucker <jean-philippe@linaro.org>,
	David Matlack <dmatlack@google.com>
Subject: Re: [RFC 0/8] iommufd: Enable noiommu mode for cdev
Date: Fri, 30 Jan 2026 15:35:29 -0400	[thread overview]
Message-ID: <20260130193529.GJ2223369@nvidia.com> (raw)
In-Reply-To: <20251201173012.18371-1-jacob.pan@linux.microsoft.com>

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

  parent reply	other threads:[~2026-01-30 19:35 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-12-01 17:30 [RFC 0/8] iommufd: Enable noiommu mode for cdev Jacob Pan
2025-12-01 17:30 ` [RFC 1/8] iommu: Make iommu_device_register_bus available beyond selftest Jacob Pan
2025-12-01 17:30 ` [RFC 2/8] iommu: Add a helper to check if any iommu device is registered Jacob Pan
2025-12-02  2:17   ` Baolu Lu
2025-12-03  0:06     ` Jacob Pan
2025-12-03  3:31       ` Baolu Lu
2025-12-03 22:28         ` Jacob Pan
2025-12-03 13:11       ` Jason Gunthorpe
2025-12-03 22:36         ` Jacob Pan
2025-12-04 10:53           ` Robin Murphy
2025-12-04 22:07             ` Jacob Pan
2025-12-12  4:02               ` Tian, Kevin
2025-12-12 19:51                 ` Jacob Pan
2025-12-01 17:30 ` [RFC 3/8] iommufd: Add a mock page table format for noiommu mode Jacob Pan
2025-12-01 17:30 ` [RFC 4/8] iommu: Add a dummy driver " Jacob Pan
2025-12-01 17:30 ` [RFC 5/8] vfio: IOMMUFD relax requirement " Jacob Pan
2025-12-12  4:05   ` Tian, Kevin
2025-12-12 19:53     ` Jacob Pan
2025-12-01 17:30 ` [RFC 6/8] vfio: Rename and remove compat from noiommu set function Jacob Pan
2025-12-01 17:30 ` [RFC 7/8] iommu: Enable cdev noiommu mode under iommufd Jacob Pan
2025-12-01 17:30 ` [RFC 8/8] iommufd: Add an ioctl IOMMU_IOAS_GET_PA to query PA from IOVA Jacob Pan
2026-01-30 19:35 ` Jason Gunthorpe [this message]
2026-02-06 22:50   ` [RFC 0/8] iommufd: Enable noiommu mode for cdev Jacob Pan

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