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b=Nyyiardu2Jm2P99Ky9DPkc45OpBK6VXC2cDJ2ntyOymvqcGgd7qxrLq7aOKcpmvrB 5XtWc3qlZGvSsKGzKNx+xxbBh9eXebQcre8M4Bb/SEeFez1GqGCqP9IYRto9erX4mA xMbo23J/F/gS9OYPIVigsvaRVXoubU6we02xEUbwHPq2xk6hXv4kjVijzWspwlc1DQ i35RE92E6sbTQMb59F66xvBBp/vg5DYOswYfaxASsoGs62yrjSwe8ELTEJGw6PkZ4a C+Bv9QieZeKuF7wRH7Mb2kELbArKXalgOTpImh/q8etNoCarPsndtLwMReFQauTWd0 bwvkCQ5iBtzuQ== 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 v3 07/10] vfio/pci: Add dma-buf export config for MMIO regions Date: Thu, 25 Sep 2025 16:14:35 +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: rspam12 X-Rspamd-Queue-Id: 492661C0018 X-Stat-Signature: he8prq11s43xhcjqigp56h4txyf8ku7d X-Rspam-User: X-HE-Tag: 1758806333-852227 X-HE-Meta: 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 Jrcaqhkp 82utsVmnY0utZcmc8zN03E/SGXr94gz9GboAOfKo3kHqlc36zXwMD0+P6aXsmWjBluwEGdKzdAv0JOommCU4drEhM9A3yUAkoeD6n/AUG14GIePwtAvZSobHiMVTp0F6JbFEaH6KLI2CwiF1+4CMwM9BYeTa57jtaMosTV6xJprBEWqSbNaT+Kt1jso1zpZThHgO9m7l9kkNsiAEJ7WGiwQlhdfZz7H7Otdd2HsirIrOx6zs= 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