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b=RZe3Hghg8tuilG38NUupXeM//AvgeiRR0kwGj/2e8WXc5R8k2LXEtxylcKu0V7VR4 1FL71pt5mLy3q7tg9mEDnGu1K88Gjtgeu2UYS8C2bKbKCCRRb9g+8K76CZAztiQE4R zdqO+vDPlmfczjhKjstsRUe+TJcL8TsKnPJphvQgKiSQraI79PT0SA713CHwIloZ1b QjKoUmsx9DTS6kou4xIZNyzUdbLcMrmVlBlLOlxFHYRxg+hUASmotNa3o3ZOLnAna3 tmduKfLeIIC88uvLVpyqh0eIdL4F2g8wYiqMwsjlbdIeqNN/nVtXrzcn3ko/5wuWDV Cj92uwQIUWB2g== 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 v2 07/10] vfio/pci: Add dma-buf export config for MMIO regions Date: Thu, 11 Sep 2025 14:33:11 +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-Queue-Id: 3D961100005 X-Stat-Signature: 7ucepcj1a8ag56de9dmn71nzcerisatq X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1757590450-140739 X-HE-Meta: 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 ZlhvBSex RdhnUjl45GF180Q2IEkGfxlkImLFCXuANb9Zw6IfadtHeF0m1k2Xo/4plWi6clWNDmSbfxYss/6j/L4VPKTi9U75h0M2xAYx228TWTj0NT/rK5pPo8GQ3FY6CZZwxxMW63i+2vkLgkOd8y1BGXpsO5KSPVTgt94Fp896HQbbQKNpFp/9pNfqGIVZm0FUwrKfThUKyEI8Wkt4CtHb0c4aEIs1ub5xwDzrACVoeQoQ7S9s+ki8= 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 2b0172f546652..55ae888bf26ae 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