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[142.167.56.70]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7d5dbe7baedsm345886685a.57.2025.07.05.11.38.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Jul 2025 11:38:27 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1uY7mM-000000068pv-2jB7; Sat, 05 Jul 2025 15:38:26 -0300 Date: Sat, 5 Jul 2025 15:38:26 -0300 From: Jason Gunthorpe To: Benjamin Gaignard Cc: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, heiko@sntech.de, nicolas.dufresne@collabora.com, iommu@lists.linux.dev, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, kernel@collabora.com Subject: Re: [PATCH v4 3/5] iommu: Add verisilicon IOMMU driver Message-ID: <20250705183826.GN904431@ziepe.ca> References: <20250623153931.158765-1-benjamin.gaignard@collabora.com> <20250623153931.158765-4-benjamin.gaignard@collabora.com> <20250704175425.GM904431@ziepe.ca> <62cead85-2d50-45f1-8020-7aea77f6833b@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <62cead85-2d50-45f1-8020-7aea77f6833b@collabora.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250705_113829_930853_A55A87C7 X-CRM114-Status: UNSURE ( 8.88 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Jul 05, 2025 at 12:04:05PM +0200, Benjamin Gaignard wrote: > I would like to avoid that but maybe a static spinlock can solve that problem ? I think you can't really (technically) store an iommu pointer in a domain and not prevent it from being used by other iommus. Can't the spinlock be in the domain? Jason