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[34.124.129.10]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ca0b454815sm3400655ad.2.2026.06.28.16.06.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 28 Jun 2026 16:06:14 -0700 (PDT) Date: Sun, 28 Jun 2026 23:06:07 +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 2/7] iommu/arm-smmu-v3: Implement is_attach_deferred() for kdump Message-ID: References: <89cbd3760a13f11cf63f6ead12f44974511f308a.1779265413.git.nicolinc@nvidia.com> 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: <89cbd3760a13f11cf63f6ead12f44974511f308a.1779265413.git.nicolinc@nvidia.com> On Wed, May 20, 2026 at 10:03:19AM -0700, Nicolin Chen wrote: > Though the kdump kernel adopts the crashed kernel's stream table, the iommu > core will still try to attach each probed device to a default domain, which > overwrites the adopted STE and breaks in-flight DMA from that device. > > Implement an is_attach_deferred() callback to prevent this. For each device > that has STE.V=1 and STE.Cfg!=Abort in the adopted table, defer the default > domain attachment, until the device driver explicitly requests it. > > Fixes: b63b3439b856 ("iommu/arm-smmu-v3: Abort all transactions if SMMU is enabled in kdump kernel") > Cc: stable@vger.kernel.org # v6.12+ > Reviewed-by: Kevin Tian > Reviewed-by: Jason Gunthorpe > Signed-off-by: Nicolin Chen Reviewed-by: Pranjal Shrivastava Thanks, Praan