linux-kernel - [PATCH 3/4] iommufd: Require DMABUF revoke semantics

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Message-ID: <20260111-dmabuf-revoke-v1-3-fb4bcc8c259b@nvidia.com>
Date: Sun, 11 Jan 2026 12:37:10 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Jason Gunthorpe <jgg@...pe.ca>,
	Leon Romanovsky <leon@...nel.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Alex Williamson <alex@...zbot.org>,
	Kevin Tian <kevin.tian@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>
Cc: linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org,
	kvm@...r.kernel.org,
	iommu@...ts.linux.dev
Subject: [PATCH 3/4] iommufd: Require DMABUF revoke semantics

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

IOMMUFD does not support page fault handling, and after a call to
.move_notify() all mappings become invalid. Ensure that the IOMMUFD
DMABUF importer is bound to a revoke‑aware DMABUF exporter (for example,
VFIO).

Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/iommu/iommufd/pages.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/iommufd/pages.c b/drivers/iommu/iommufd/pages.c
index dbe51ecb9a20..a233def71be0 100644
--- a/drivers/iommu/iommufd/pages.c
+++ b/drivers/iommu/iommufd/pages.c
@@ -1451,7 +1451,7 @@ static void iopt_revoke_notify(struct dma_buf_attachment *attach)
 
 static struct dma_buf_attach_ops iopt_dmabuf_attach_revoke_ops = {
 	.allow_peer2peer = true,
-	.move_notify = iopt_revoke_notify,
+	.revoke_notify = iopt_revoke_notify,
 };
 
 /*

-- 
2.52.0