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[34.124.129.10]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-37eb013af70sm3876698a91.0.2026.06.29.09.24.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Jun 2026 09:24:30 -0700 (PDT) Date: Mon, 29 Jun 2026 16:24:24 +0000 From: Pranjal Shrivastava To: Nicolin Chen Cc: will@kernel.org, robin.murphy@arm.com, jgg@nvidia.com, joro@8bytes.org, kees@kernel.org, baolu.lu@linux.intel.com, kevin.tian@intel.com, miko.lenczewski@arm.com, smostafa@google.com, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, stable@vger.kernel.org, jamien@nvidia.com Subject: Re: [PATCH rc v6 5/7] iommu/arm-smmu-v3: Retain CR0_SMMUEN during kdump device reset Message-ID: References: Precedence: bulk X-Mailing-List: stable@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 Wed, May 20, 2026 at 10:03:22AM -0700, Nicolin Chen wrote: > When ARM_SMMU_OPT_KDUMP_ADOPT is detected, do not disable SMMUEN and skip > the CR1/CR2/STRTAB_BASE update sequence in arm_smmu_device_reset(). Those > register writes are all CONSTRAINED UNPREDICTABLE while CR0_SMMUEN==1, so > leaving them intact lets in-flight DMAs continue to be translated by the > adopted stream table. > > Initialize 'enables' to 0 so it can carry CR0_SMMUEN in kdump case. Then, > preserve that when enabling the command queue. > > Clear latched gerror bits if necessary. > > Fixes: b63b3439b856 ("iommu/arm-smmu-v3: Abort all transactions if SMMU is enabled in kdump kernel") > Cc: stable@vger.kernel.org # v6.12+ > Signed-off-by: Nicolin Chen > Reviewed-by: Kevin Tian Reviewed-by: Pranjal Shrivastava Thanks, Praan