Hi, Dong. I have prepared a 5.4 test kernel for 20.04 with that patch applied for you to test here: https://launchpad.net/~magalilemes/+archive/ubuntu/test-kernels-3 You can add the PPA to your system by running `add-apt-repository ppa:magalilemes/test-kernels-3` and install (or upgrade to) the test kernel by running `apt install linux-generic -y`. To confirm that solves your issue, make sure, then, you're running the patched kernel by running `uname -a` and checking that the string `5.4.0-2000-generic #0+test-Ubuntu` is present.
Additionally, could you provide more details about the issue you found? For example, do those instances you mention fail to boot? After confirming that patch solves the issue, I'll submit the patch targeting the generic kernel. -- 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
