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([2406:7400:63:75fd:f9a4:4062:7980:1324]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a428fa380sm2209020eec.12.2026.10.29.18.45.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2026 18:45:49 -0700 (PDT) From: Anuj Gupta To: axboe@kernel.dk, asml.silence@gmail.com, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, James.Bottomley@HansenPartnership.com, mkp@kernel.org, bernd@bsbernd.com, joannelkoong@gmail.com, miklos@szeredi.hu Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, fuse-devel@lists.linux.dev, joshi.k@samsung.com, anuj20.g@samsung.com Subject: [PATCH v3 0/5] dma-buf backed NVMe passthrough I/O Date: Fri, 30 Oct 2026 07:15:35 +0530 Message-ID: <20261030014540.3065403-1-anuj1072538@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series adds support for dma-buf registered buffers in NVMe uring_cmd passthrough. Patches 1-2 add import flags to the fixed buffer import helpers, so uring_cmd users have to opt in to dma-buf. Patch 3 adds the io_uring side, patch 4 lets the block layer map dma-buf iterators for passthrough, and patch 5 enables it for the NVMe namespace character device. Tested with this liburing test: https://github.com/anuj7781/liburing/tree/rw-dmabuf-pt Changes since v2: - return -EOPNOTSUPP when the controller has no dma-buf support (Pavel) v2: https://lore.kernel.org/linux-block/20261022144501.2478417-1-anuj1072538@gmail.com/ Changes since v1: - split into io_uring, block and nvme patches (Christoph) - pass import flags to io_import_reg_buf() and io_uring_cmd_import_fixed(), and make callers opt in to dma-buf (Christoph, Pavel) - add io_uring_cmd_hw_done(), so nvme no longer handles the dma-buf map (Pavel) - warn if task_work is queued with a dma-buf map attached (Pavel) - make the -EREMOTEIO conversion explicit and comment it (Christoph) - refuse dma-bufs larger than 4GiB on the character device v1: https://lore.kernel.org/linux-nvme/20261016103453.1129150-1-anuj1072538@gmail.com/ Anuj Gupta (5): io_uring/rsrc: pass import flags to io_import_reg_buf() io_uring/uring_cmd: add import flags to io_uring_cmd_import_fixed() io_uring/uring_cmd: support dma-buf registered buffers block: map dma-buf iterators in blk_rq_map_user_iov() nvme: support dma-buf registered buffers for passthrough block/blk-map.c | 15 ++++++++++++++- drivers/nvme/host/core.c | 16 ++++++++++++++++ drivers/nvme/host/ioctl.c | 5 +++-- drivers/scsi/scsi_bsg.c | 2 +- fs/fuse/dev_uring.c | 2 +- include/linux/io_uring/cmd.h | 14 ++++++++++++-- io_uring/net.c | 6 +++--- io_uring/rsrc.c | 6 +++--- io_uring/rsrc.h | 13 +++---------- io_uring/rw.c | 5 +++-- io_uring/uring_cmd.c | 31 +++++++++++++++++++++++++++++-- 11 files changed, 88 insertions(+), 27 deletions(-) base-commit: 70866cfa169d5ee149364267289e71d50f9a7ae9 -- 2.43.0