Hi Magali Lemes do Sacramento Thank you for providing the 5.4 test kernel with the patch applied. I have installed it on my system, and it successfully resolved the issue I was encountering. Below is the output of uname -a to confirm that I am running the patched kernel:"Linux qidong-ubuntu20 5.4.0-2000-generic #0+test-Ubuntu SMP Mon Mar 31 13:00:43 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux"
To provide more details about the issue I encountered: The problem occurred on an ARM bare-metal instance (ebmc8y specification) on Alibaba Cloud when running Ubuntu 20. During the boot process, while loading the ARM SMMUv3 driver, there was a conflict error during the ioremap operation. Interestingly, this issue did not occur on Ubuntu 22. After performing a comparative analysis between the kernels of Ubuntu 20 and Ubuntu 22, we identified that the patch I provided resolves the ioremap conflict error. This confirms that the patch is effective in addressing the problem. I hope this patch can be integrated into the generic kernel to ensure broader compatibility and stability for users running Ubuntu 20 on similar hardware configurations. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2067864 Title: iommu/arm-smmu-v3: Don't reserve implementation defined register space Status in linux package in Ubuntu: New Status in linux-aws package in Ubuntu: New Status in linux source package in Focal: New Status in linux-aws source package in Focal: Fix Committed Bug description: SRU Justification [Impact] In order to solve boot issues with new instance types running the 5.4 kernels, AWS has requested a backport of upstream commit 52f3fab0067d ("iommu/arm-smmu-v3: Don't reserve implementation defined register space"). [Fix] There was a conflict when adding arm_smmu_ioremap() due to the current context missing ab246774713e ("iommu/arm-smmu-v3: Unregister IOMMU and bus ops on device removal"). [Test] It's been tested that the new instances can boot successfully with the AWS 5.4 kernels with this patch applied. [Where problems could occur] This touches probing of the ARM SMMUv3 driver, which might lead to boot failures or system instability. [Other info] SF #00407928 ---------------------------- Original bug report ---------------------------- can ubuntu 20.04 kernel backport this commit：https://github.com/torvalds/linux/commit/52f3fab0067d6fa9e99c1b7f63265dd48ca76046 to avoid resource reservation conflicts. we met this problem in aliyun ebmc8y instance type To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2067864/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
