linux-kernel - [PATCH v3 6/7] vfio: Wait for dma-buf invalidation to complete

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260120-dmabuf-revoke-v3-6-b7e0b07b8214@nvidia.com>
Date: Tue, 20 Jan 2026 16:07:06 +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>,
	Felix Kuehling <Felix.Kuehling@....com>,
	Alex Williamson <alex@...zbot.org>,
	Ankit Agrawal <ankita@...dia.com>,
	Vivek Kasireddy <vivek.kasireddy@...el.com>
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 v3 6/7] vfio: Wait for dma-buf invalidation to complete

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

dma-buf invalidation is performed asynchronously by hardware, so VFIO must
wait until all affected objects have been fully invalidated.

Fixes: 5d74781ebc86 ("vfio/pci: Add dma-buf export support for MMIO regions")
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/vfio/pci/vfio_pci_dmabuf.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci_dmabuf.c b/drivers/vfio/pci/vfio_pci_dmabuf.c
index d4d0f7d08c53..33bc6a1909dd 100644
--- a/drivers/vfio/pci/vfio_pci_dmabuf.c
+++ b/drivers/vfio/pci/vfio_pci_dmabuf.c
@@ -321,6 +321,9 @@ void vfio_pci_dma_buf_move(struct vfio_pci_core_device *vdev, bool revoked)
 			dma_resv_lock(priv->dmabuf->resv, NULL);
 			priv->revoked = revoked;
 			dma_buf_move_notify(priv->dmabuf);
+			dma_resv_wait_timeout(priv->dmabuf->resv,
+					      DMA_RESV_USAGE_KERNEL, false,
+					      MAX_SCHEDULE_TIMEOUT);
 			dma_resv_unlock(priv->dmabuf->resv);
 		}
 		fput(priv->dmabuf->file);
@@ -342,6 +345,8 @@ void vfio_pci_dma_buf_cleanup(struct vfio_pci_core_device *vdev)
 		priv->vdev = NULL;
 		priv->revoked = true;
 		dma_buf_move_notify(priv->dmabuf);
+		dma_resv_wait_timeout(priv->dmabuf->resv, DMA_RESV_USAGE_KERNEL,
+				      false, MAX_SCHEDULE_TIMEOUT);
 		dma_resv_unlock(priv->dmabuf->resv);
 		vfio_device_put_registration(&vdev->vdev);
 		fput(priv->dmabuf->file);

-- 
2.52.0