From nobody Thu Oct 2 21:40:07 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86E4F31C570; Thu, 11 Sep 2025 11:34:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757590449; cv=none; b=lFPkdrnrVa+LKwK5aSKW0QxfqaQz0tLNjcVoHc47trZYj7TDhDyqJ9+TviX4OvJXPHr0HuXlM10ASdE7PSyAIab6CXfQ6Y+N5i9xo9zOV07oZ9XA0TVQMDszts6vSS8w7NyWzom8D+O7jNB1Q1vOlji/W/vDd4ZRN29GJsH6fps= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757590449; c=relaxed/simple; bh=J3JcsAko8zSIGuiXV9DflNw5AuJmzcXfJS1bY+J5d1Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gpfdPGC55ah/zxRGI+CW5h65wU9tLNbVI0g9q7vFOCx3AMdlBnGHlQsPBWnbDzPUA37LPt2zUI0HuEKqe7N/Zi6PTdIIOQdFn6T/mui3/9w4h4wouLK/S+MVKqay8hdLwuLtJTbg4JnaKeUVg/4AHmyae2z3A4/i7S4nR8MXpbM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RZe3Hghg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="RZe3Hghg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A5D78C4CEF1; Thu, 11 Sep 2025 11:34:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757590449; bh=J3JcsAko8zSIGuiXV9DflNw5AuJmzcXfJS1bY+J5d1Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; 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: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 =20 To enable s390x KVM vfio-pci extensions, say Y. =20 +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" =20 source "drivers/vfio/pci/hisilicon/Kconfig" --=20 2.51.0