** Changed in: linux-azure (Ubuntu Impish)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1967166
Title:
Azure: not enough RAM under 4GB for CVM
Status in linux-azure package in Ubuntu:
Fix Committed
Status in linux-azure source package in Impish:
Fix Committed
Status in linux-azure source package in Jammy:
Fix Committed
Bug description:
SRU Justification
[Impact]
Can you please include one more patchset for the "no enough RAM under 4GB"
issue for the v5.13 kernel (and v5.15 kernel):
https://lwn.net/ml/linux-kernel/20220209122302.213882-2-ltyker...@gmail.com/
https://lwn.net/ml/linux-kernel/20220209122302.213882-3-ltyker...@gmail.com/
Without the two patches, currently the 5.13 kernel (and 5.15 kernel)
can't boot as a CVM guest on Azure. :-(
The background is: currently an Azure host only provides about 900 MB
memory below the 4GB boundary while the swiotlb code (which is
required by the CVM patchset) needs to allocate memory of a size of
MIN(1GB, 6% of the total memory). There will be an Azure host update,
with which the host will provide about 3GB memory below the 4GB
boundary, but we still need to wait a few more weeks to know the ETA.
Currently the above two patches can work around the issue from the
guest side.
[Test Case]
Microsoft tested
[Where things could go wrong]
These patches could affect non-CVM instances.
[Other Info]
SF: #00323683
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