linux-kernel - [PATCH v2 4/4] vfio: Add pinned interface to perform revoke semantics

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Message-ID: <20260118-dmabuf-revoke-v2-4-a03bb27c0875@nvidia.com>
Date: Sun, 18 Jan 2026 14:08:48 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Alex Deucher <alexander.deucher@....com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Gerd Hoffmann <kraxel@...hat.com>,
	Dmitry Osipenko <dmitry.osipenko@...labora.com>,
	Gurchetan Singh <gurchetansingh@...omium.org>,
	Chia-I Wu <olvaffe@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Leon Romanovsky <leon@...nel.org>,
	Kevin Tian <kevin.tian@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Alex Williamson <alex@...zbot.org>
Cc: linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org,
	linux-kernel@...r.kernel.org,
	amd-gfx@...ts.freedesktop.org,
	virtualization@...ts.linux.dev,
	intel-xe@...ts.freedesktop.org,
	linux-rdma@...r.kernel.org,
	iommu@...ts.linux.dev,
	kvm@...r.kernel.org
Subject: [PATCH v2 4/4] vfio: Add pinned interface to perform revoke semantics

From: Leon Romanovsky <leonro@...dia.com>

DMABUF ->pin() interface is called when the DMABUF importer perform
its DMA mapping, so let's use this opportunity to check if DMABUF
exporter revoked its buffer or not.

Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/vfio/pci/vfio_pci_dmabuf.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c
index d4d0f7d08c53..af9c315ddf71 100644
--- a/drivers/vfio/pci/vfio_pci_dmabuf.c
+++ b/drivers/vfio/pci/vfio_pci_dmabuf.c
@@ -20,6 +20,20 @@ struct vfio_pci_dma_buf {
 	u8 revoked : 1;
 };
 
+static int vfio_pci_dma_buf_pin(struct dma_buf_attachment *attachment)
+{
+	struct vfio_pci_dma_buf *priv = attachment->dmabuf->priv;
+
+	dma_resv_assert_held(priv->dmabuf->resv);
+
+	return dma_buf_attachment_is_revoke(attachment) ? 0 : -EOPNOTSUPP;
+}
+
+static void vfio_pci_dma_buf_unpin(struct dma_buf_attachment *attachment)
+{
+	/* Do nothing */
+}
+
 static int vfio_pci_dma_buf_attach(struct dma_buf *dmabuf,
 				   struct dma_buf_attachment *attachment)
 {
@@ -76,6 +90,8 @@ static void vfio_pci_dma_buf_release(struct dma_buf *dmabuf)
 }
 
 static const struct dma_buf_ops vfio_pci_dmabuf_ops = {
+	.pin = vfio_pci_dma_buf_pin,
+	.unpin = vfio_pci_dma_buf_unpin,
 	.attach = vfio_pci_dma_buf_attach,
 	.map_dma_buf = vfio_pci_dma_buf_map,
 	.unmap_dma_buf = vfio_pci_dma_buf_unmap,

-- 
2.52.0