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[47.55.120.4]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8846e47115bsm1948696d6.21.2025.11.19.11.41.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Nov 2025 11:41:21 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vLo3M-00000000bbB-3imG; Wed, 19 Nov 2025 15:41:20 -0400 Date: Wed, 19 Nov 2025 15:41:20 -0400 From: Jason Gunthorpe To: "Tian, Kevin" Cc: Leon Romanovsky , Bjorn Helgaas , Logan Gunthorpe , Jens Axboe , Robin Murphy , Joerg Roedel , Will Deacon , Marek Szyprowski , Andrew Morton , Jonathan Corbet , Sumit Semwal , Christian =?utf-8?B?S8O2bmln?= , Kees Cook , "Gustavo A. R. Silva" , Ankit Agrawal , Yishai Hadas , Shameer Kolothum , Alex Williamson , Krishnakant Jaju , Matt Ochs , "linux-pci@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-block@vger.kernel.org" , "iommu@lists.linux.dev" , "linux-mm@kvack.org" , "linux-doc@vger.kernel.org" , "linux-media@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , "linaro-mm-sig@lists.linaro.org" , "kvm@vger.kernel.org" , "linux-hardening@vger.kernel.org" , "Kasireddy, Vivek" Subject: Re: [PATCH v8 10/11] vfio/pci: Add dma-buf export support for MMIO regions Message-ID: <20251119194120.GR17968@ziepe.ca> References: <20251111-dmabuf-vfio-v8-0-fd9aa5df478f@nvidia.com> <20251111-dmabuf-vfio-v8-10-fd9aa5df478f@nvidia.com> <20251118142849.GG17968@ziepe.ca> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Nov 18, 2025 at 11:56:14PM +0000, Tian, Kevin wrote: > > > > + down_write(&vdev->memory_lock); > > > > + list_for_each_entry_safe(priv, tmp, &vdev->dmabufs, dmabufs_elm) > > > > { > > > > + if (!get_file_active(&priv->dmabuf->file)) > > > > + continue; > > > > + > > > > + dma_resv_lock(priv->dmabuf->resv, NULL); > > > > + list_del_init(&priv->dmabufs_elm); > > > > + priv->vdev = NULL; > > > > + priv->revoked = true; > > > > + dma_buf_move_notify(priv->dmabuf); > > > > + dma_resv_unlock(priv->dmabuf->resv); > > > > + vfio_device_put_registration(&vdev->vdev); > > > > + fput(priv->dmabuf->file); > > > > > > dma_buf_put(priv->dmabuf), consistent with other places. > > > > Someone else said this, I don't agree, the above got the get via > > > > get_file_active() instead of a dma_buf version.. > > > > So we should pair with get_file_active() vs fput(). > > > > Christian rejected the idea of adding a dmabuf wrapper for > > get_file_active(), oh well. > > Okay then vfio_pci_dma_buf_move() should be changed. It uses > get_file_active() to pair dma_buf_put(). Makes sense, Leon can you fix it? Thanks, Jason