** 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 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: In Progress 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
