** Description changed: - can ubuntu 20.04 kernel backport this - commit：https://github.com/torvalds/linux/commit/52f3fab0067d6fa9e99c1b7f63265dd48ca76046 - to avoid resource reservation conflicts. + 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
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2067864 Title: iommu/arm-smmu-v3: Don't reserve implementation defined register space To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2067864/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
