Public bug reported:
SRU Justification
[ Impact ]
* Microsoft request to fix long boot times on arm64 VMs with 96 cores.
[ Fix ]
* Clean cherry-pick of the following patches from upstream:
* 5c63db59c5f8: "arm64: mm: Don't remap pgtables per-cont(pte|pmd) block"
* 1fcb7cea8a5f: "arm64: mm: Batch dsb and isb when populating pgtables"
* 0e9df1c905d8: "arm64: mm: Don't remap pgtables for allocate vs populat"
[ Test Plan ]
* Compile tested
* Microsoft to test further
[ Where problems could occur ]
*
[ Other info ]
* SF#00412644
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-azure (Ubuntu Jammy)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Noble)
Importance: Undecided
Status: New
** Affects: linux-azure (Ubuntu Oracular)
Importance: Undecided
Status: Invalid
** Affects: linux-azure (Ubuntu Plucky)
Importance: Undecided
Status: Invalid
** Affects: linux-azure (Ubuntu Questing)
Importance: Undecided
Status: Invalid
** Also affects: linux-azure (Ubuntu Plucky)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Questing)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Oracular)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: linux-azure (Ubuntu Questing)
Status: New => Invalid
** Changed in: linux-azure (Ubuntu Plucky)
Status: New => Invalid
** Changed in: linux-azure (Ubuntu Oracular)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2114218
Title:
[Arm64] High reboot time for 96 core Linux VMs
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