From: Nicolin Chen <nicolinc@nvidia.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: "Alex Williamson" <alex@shazbot.org>,
"Christian König" <christian.koenig@amd.com>,
dri-devel@lists.freedesktop.org, iommu@lists.linux.dev,
"Joerg Roedel" <joro@8bytes.org>,
"Kevin Tian" <kevin.tian@intel.com>,
kvm@vger.kernel.org, linaro-mm-sig@lists.linaro.org,
linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org,
"Robin Murphy" <robin.murphy@arm.com>,
"Shuah Khan" <shuah@kernel.org>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Will Deacon" <will@kernel.org>,
"Krishnakant Jaju" <kjaju@nvidia.com>,
"Leon Romanovsky" <leon@kernel.org>,
"Matt Ochs" <mochs@nvidia.com>,
patches@lists.linux.dev, "Simona Vetter" <simona.vetter@ffwll.ch>,
"Vivek Kasireddy" <vivek.kasireddy@intel.com>,
"Xu Yilun" <yilun.xu@linux.intel.com>
Subject: Re: [PATCH 2/9] iommufd: Add DMABUF to iopt_pages
Date: Fri, 7 Nov 2025 10:02:48 -0800 [thread overview]
Message-ID: <aQ40SOjespJjyB9K@Asurada-Nvidia> (raw)
In-Reply-To: <2-v1-af84a3ab44f5+f68-iommufd_buf_jgg@nvidia.com>
On Fri, Nov 07, 2025 at 12:49:34PM -0400, Jason Gunthorpe wrote:
> Add IOPT_ADDRESS_DMABUF to the iopt_pages and the basic infrastructure to
> create an iopt_pages from a struct dma_buf *.
>
> DMABUF pages are not supported for accesses, and for now can only be used
> with the VFIO DMABUF exporter.
>
> The overall flow will be similar to memfd where the user can pass in a
> DMABUF file descriptor to IOMMU_IOAS_MAP_FILE and create an area and
> pages. Like other areas it can be copied and otherwise manipulated, though
> there is little point in doing so.
>
> There is no pinned page accounting done for DMABUF maps.
>
> The DMABUF attachment exists so long as the dmabuf is mapped into an IOAS,
> even if the IOAS is not mapped to any domains.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
next prev parent reply other threads:[~2025-11-07 18:03 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-07 16:49 [PATCH 0/9] Initial DMABUF support for iommufd Jason Gunthorpe
2025-11-07 16:49 ` [PATCH 1/9] vfio/pci: Add vfio_pci_dma_buf_iommufd_map() Jason Gunthorpe
2025-11-20 7:49 ` Tian, Kevin
2025-11-20 17:34 ` Nicolin Chen
2025-11-07 16:49 ` [PATCH 2/9] iommufd: Add DMABUF to iopt_pages Jason Gunthorpe
2025-11-07 18:02 ` Nicolin Chen [this message]
2025-11-20 7:55 ` Tian, Kevin
2025-11-21 14:27 ` Jason Gunthorpe
2025-11-07 16:49 ` [PATCH 3/9] iommufd: Do not map/unmap revoked DMABUFs Jason Gunthorpe
2025-11-07 18:30 ` Nicolin Chen
2025-11-20 7:56 ` Tian, Kevin
2025-11-07 16:49 ` [PATCH 4/9] iommufd: Allow a DMABUF to be revoked Jason Gunthorpe
2025-11-13 23:26 ` Nicolin Chen
2025-11-20 7:58 ` Tian, Kevin
2025-11-07 16:49 ` [PATCH 5/9] iommufd: Allow MMIO pages in a batch Jason Gunthorpe
2025-11-13 23:28 ` Nicolin Chen
2025-11-20 7:59 ` Tian, Kevin
2025-11-20 14:59 ` Jason Gunthorpe
2025-11-07 16:49 ` [PATCH 6/9] iommufd: Have pfn_reader process DMABUF iopt_pages Jason Gunthorpe
2025-11-13 23:39 ` Nicolin Chen
2025-11-18 19:38 ` Jason Gunthorpe
2025-11-20 8:04 ` Tian, Kevin
2025-11-21 0:47 ` Jason Gunthorpe
2025-11-21 14:33 ` Jason Gunthorpe
2025-11-07 16:49 ` [PATCH 7/9] iommufd: Have iopt_map_file_pages convert the fd to a file Jason Gunthorpe
2025-11-13 23:43 ` Nicolin Chen
2025-11-20 8:05 ` Tian, Kevin
2025-11-07 16:49 ` [PATCH 8/9] iommufd: Accept a DMABUF through IOMMU_IOAS_MAP_FILE Jason Gunthorpe
2025-11-14 0:05 ` Nicolin Chen
2025-11-18 19:44 ` Jason Gunthorpe
2025-11-18 19:57 ` Nicolin Chen
2025-11-20 8:06 ` Tian, Kevin
2025-11-07 16:49 ` [PATCH 9/9] iommufd/selftest: Add some tests for the dmabuf flow Jason Gunthorpe
2025-11-07 19:43 ` Nicolin Chen
2025-11-18 19:25 ` Jason Gunthorpe
2025-11-20 8:06 ` Tian, Kevin
2025-11-07 17:52 ` [PATCH 0/9] Initial DMABUF support for iommufd Nicolin Chen
2025-11-13 6:33 ` Shuai Xue
2025-11-13 7:34 ` Nicolin Chen
2025-11-13 11:32 ` Shuai Xue
2025-11-13 17:44 ` Nicolin Chen
2025-11-13 18:37 ` Alex Williamson
2025-11-17 15:50 ` Jason Gunthorpe
2025-11-18 5:37 ` Kasireddy, Vivek
2025-11-18 14:59 ` Jason Gunthorpe
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