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[142.162.112.119]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8c6a71ad820sm1209794385a.10.2026.01.21.05.18.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jan 2026 05:18:53 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1viY6m-00000006DUF-3lkE; Wed, 21 Jan 2026 09:18:52 -0400 Date: Wed, 21 Jan 2026 09:18:52 -0400 From: Jason Gunthorpe To: Christian =?utf-8?B?S8O2bmln?= Cc: Leon Romanovsky , Sumit Semwal , Alex Deucher , David Airlie , Simona Vetter , Gerd Hoffmann , Dmitry Osipenko , Gurchetan Singh , Chia-I Wu , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Lucas De Marchi , Thomas =?utf-8?Q?Hellstr=C3=B6m?= , Rodrigo Vivi , Kevin Tian , Joerg Roedel , Will Deacon , Robin Murphy , Felix Kuehling , Alex Williamson , Ankit Agrawal , Vivek Kasireddy , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, virtualization@lists.linux.dev, intel-xe@lists.freedesktop.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, kvm@vger.kernel.org Subject: Re: [PATCH v3 3/7] dma-buf: Document RDMA non-ODP invalidate_mapping() special case Message-ID: <20260121131852.GX961572@ziepe.ca> References: <20260120-dmabuf-revoke-v3-0-b7e0b07b8214@nvidia.com> <20260120-dmabuf-revoke-v3-3-b7e0b07b8214@nvidia.com> <4fe42e7e-846c-4aae-8274-3e9a5e7f9a6d@amd.com> <20260121091423.GY13201@unreal> <7cfe0495-f654-4f9d-8194-fa5717eeafff@amd.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <7cfe0495-f654-4f9d-8194-fa5717eeafff@amd.com> On Wed, Jan 21, 2026 at 10:17:16AM +0100, Christian König wrote: > The whole idea is to make invalidate_mappings truly optional. But it's not really optional! It's absence means we are ignoring UAF security issues when the exporters do their move_notify() and nothing happens. Given this I don't want to loose the warning log either, the situation needs to be reported.. Jason