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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> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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