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Mon, 10 Nov 2025 15:05:29 -0500 (EST) Date: Mon, 10 Nov 2025 13:05:25 -0700 From: Alex Williamson To: Leon Romanovsky Cc: Bjorn Helgaas , Logan Gunthorpe , Jens Axboe , Robin Murphy , Joerg Roedel , Will Deacon , Marek Szyprowski , Jason Gunthorpe , Andrew Morton , Jonathan Corbet , Sumit Semwal , Christian =?UTF-8?B?S8O2bmln?= , Kees Cook , "Gustavo A. R. Silva" , Ankit Agrawal , Yishai Hadas , Shameer Kolothum , Kevin Tian , Krishnakant Jaju , Matt Ochs , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, iommu@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, kvm@vger.kernel.org, linux-hardening@vger.kernel.org, Vivek Kasireddy Subject: Re: [PATCH v7 10/11] vfio/pci: Add dma-buf export support for MMIO regions Message-ID: <20251110130525.6712552b.alex@shazbot.org> In-Reply-To: <20251106-dmabuf-vfio-v7-10-2503bf390699@nvidia.com> References: <20251106-dmabuf-vfio-v7-0-2503bf390699@nvidia.com> <20251106-dmabuf-vfio-v7-10-2503bf390699@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2B76A40005 X-Stat-Signature: yg6ajco9ji3crruq89yywsd3ag3fy6mo X-HE-Tag: 1762805134-205229 X-HE-Meta: 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 WTHF+yee K3AsuwgJAONczYpn+cOXLzE3B3U5eoWaI1XdO47vgLUSSCTGi6A4JHKcsQVswLAlw6CpWwlofdzC1dQQWBBlFO1iKOM/V8XOblDmy2vhAjm71KJuCuHd01SW8N2aJ51iAEN0Hqv9/UXW7k+7oByg7jzsnMFZyV8QLhYbux8DVWzZvhSWG03iJnXXjrKvlhEUEzJ9unGhm6ONRDm9rnN/VH1homU6+Or/LvZjDURKk/pURUNoVbJRK0XCBgvhFL7MElNmp1zfWzUt+5F5olEnHlJGTglT4fm9L0opaxYtnMl7U+MGRoAMe4rMhBL1Kn/p+9M0cIBaIj9TA/KfpO8OHzzcIwKsvQFC0RWfGShX19+r8FU7mdtu+u9AYSnTyiKzwCAK2hxpNdwPpV35QY9lQEQIaTPJiEhHAdHqRqOZcbpsMj9Y= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 6 Nov 2025 16:16:55 +0200 Leon Romanovsky wrote: > diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c > new file mode 100644 > index 000000000000..cbf502b14e3c > --- /dev/null > +++ b/drivers/vfio/pci/vfio_pci_dmabuf.c ... > + > +int vfio_pci_core_feature_dma_buf(struct vfio_pci_core_device *vdev, u32 flags, > + struct vfio_device_feature_dma_buf __user *arg, > + size_t argsz) > +{ > + struct vfio_device_feature_dma_buf get_dma_buf = {}; > + struct vfio_region_dma_range *dma_ranges; > + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); > + struct vfio_pci_dma_buf *priv; > + size_t length; > + int ret; > + > + if (!vdev->pci_ops->get_dmabuf_phys) vdev->pci_ops can be NULL. Thanks, Alex