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b=NLB5tQ504wyZ06bziwpYmGZs7d/65HLAkuIuZ2w4wn63OQWzA8bn3uwK2vY1fgyI7 YteGOFAlizroxNAAuzQVXbCY9BcNIxlVfue87ttl/p7PYCe+EKehOJBOf/gVZL7//D n0laClD+mHZgAZM/Osi+VvseOvikIkXb3YMq3iu8apoVM0OBIeMSkcTfGVuSjG+EE9 3kEM4QUMzbWESQaHowjOKmhur2RNOJQhGfp4qdw9S7QyYrhUnGD0GXrNplr9mN60YV 6Lr/kXRnTMWDPREa03fJk816RxmBwA7pvVuO5H7m9HKib+l/yxguspmf3YaWOSj33n pNZ5pv/0Y7MIw== From: Leon Romanovsky To: Alex Williamson Cc: Leon Romanovsky , Jason Gunthorpe , Andrew Morton , Bjorn Helgaas , =?UTF-8?q?Christian=20K=C3=B6nig?= , dri-devel@lists.freedesktop.org, iommu@lists.linux.dev, Jens Axboe , Joerg Roedel , kvm@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Logan Gunthorpe , Marek Szyprowski , Robin Murphy , Sumit Semwal , Vivek Kasireddy , Will Deacon Subject: [PATCH v4 07/10] vfio/pci: Add dma-buf export config for MMIO regions Date: Sun, 28 Sep 2025 17:50:17 +0300 Message-ID: X-Mailer: git-send-email 2.51.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 85C9B1C0004 X-Stat-Signature: z4dygcoyon9fspg378p4p3ujczdwxxkm X-Rspam-User: X-HE-Tag: 1759071087-816870 X-HE-Meta: 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 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: From: Leon Romanovsky Add new kernel config which indicates support for dma-buf export of MMIO regions, which implementation is provided in next patches. Signed-off-by: Leon Romanovsky --- drivers/vfio/pci/Kconfig | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig index 2b0172f54665..55ae888bf26a 100644 --- a/drivers/vfio/pci/Kconfig +++ b/drivers/vfio/pci/Kconfig @@ -55,6 +55,26 @@ config VFIO_PCI_ZDEV_KVM To enable s390x KVM vfio-pci extensions, say Y. +config VFIO_PCI_DMABUF + bool "VFIO PCI extensions for DMA-BUF" + depends on VFIO_PCI_CORE + depends on PCI_P2PDMA && DMA_SHARED_BUFFER + default y + help + Enable support for VFIO PCI extensions that allow exporting + device MMIO regions as DMA-BUFs for peer devices to access via + peer-to-peer (P2P) DMA. + + This feature enables a VFIO-managed PCI device to export a portion + of its MMIO BAR as a DMA-BUF file descriptor, which can be passed + to other userspace drivers or kernel subsystems capable of + initiating DMA to that region. + + Say Y here if you want to enable VFIO DMABUF-based MMIO export + support for peer-to-peer DMA use cases. + + If unsure, say N. + source "drivers/vfio/pci/mlx5/Kconfig" source "drivers/vfio/pci/hisilicon/Kconfig" -- 2.51.0