From mboxrd@z Thu Jan 1 00:00:00 1970 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 1A0B0225760; Sun, 28 Sep 2025 14:51:26 +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=1759071087; cv=none; b=hjVJ0GN1FpF4ESCW9EnFga7WqrUIXOusYEYAUnNSMLBVb4KsPwWBvM153NciUSHCrhAw/HX5KFs3fMslqzcUSXFwKSZgO1pX1e8/lnUW2yxbAWOKfN9Ftt/sNdlh7+e5xOR4gjuLAPj+bCDRXKUZU6+sImc7s0wL4jZd4GLq2Gg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759071087; c=relaxed/simple; bh=DKvwpCnqloOQP4gNjx4LpWv4LaALSpED/WAUwRqb9RQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=buBqCu8Xx4mCOmc5+fykejaEs5bpWOzcC6PtGWqudcbIkc7G/WtKihXxRXNu4kjgjqswhynPcit/Ff/Y/Q/79idBsP4yRD7KEH4ZLQZ8MJ/HRIzpB9TTeBtSkkTG2bXVXdyJ4OXa32RdSYvmU5hkBoMLodpXvUUcHIhBJgaH48A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NLB5tQ50; 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="NLB5tQ50" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 23892C4CEF0; Sun, 28 Sep 2025 14:51:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1759071086; bh=DKvwpCnqloOQP4gNjx4LpWv4LaALSpED/WAUwRqb9RQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; 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: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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