** Tags added: kernel-daily-bug
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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:
In Progress
Status in linux-aws source package in Focal:
Fix Released
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
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