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[142.167.219.86]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7c7a89437a4sm164415585a.23.2025.04.10.16.00.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Apr 2025 16:00:09 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1u30sS-00000000GRz-4851; Thu, 10 Apr 2025 20:00:08 -0300 Date: Thu, 10 Apr 2025 20:00:08 -0300 From: Jason Gunthorpe To: Shyam Saini Cc: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, virtualization@lists.linux.dev, will@kernel.org, jacob.pan@linux.microsoft.com, eric.auger@redhat.com, code@tyhicks.com, eahariha@linux.microsoft.com, vijayb@linux.microsoft.com Subject: Re: [PATCH v2 0/3] arm-smmu: select suitable IOVA Message-ID: <20250410230008.GA6905@ziepe.ca> References: <20250410225030.2528385-1-shyamsaini@linux.microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250410225030.2528385-1-shyamsaini@linux.microsoft.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250410_160012_118075_EDB4E736 X-CRM114-Status: GOOD ( 18.34 ) 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 Thu, Apr 10, 2025 at 03:50:27PM -0700, Shyam Saini wrote: > > Hi, > > Currently, the MSI_IOVA_BASE address is hard-coded to 0x80000000, > assuming that all platforms have this address available for MSI IOVA > reservation. However, this is not always the case, as some platforms > reserve this address for other purposes. Consequently, these platforms > cannot reserve the MSI_IOVA_BASE address for MSI. > > There was an [1] attempt to fix this problem by passing the MSI IOVA > base as a kernel command line parameter. > > This patch series aims to address the issue by introducing a new DTS > property, "arm,smmu-faulty-msi-iova" which can be used to hold faulty > MSI IOVA address. This property can be passed to ARM SMMU drivers > via device tree so that the drivers can select appropriate MSI IOVA base > address which doesn't intersect with the faulty MSI IOVA address. I thought we already talked about this and you were not going to be doing a DT proposal for a software knob? And then you didn't even link to the recent discussion :( https://lore.kernel.org/linux-iommu/20250403232619.GA681099@ziepe.ca/ It is easily solved in the smmuv3 driver without out any DT. Please do that. Jason