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

Status in linux-azure package in Ubuntu:
  Invalid
Status in linux-azure source package in Jammy:
  New
Status in linux-azure source package in Noble:
  New
Status in linux-azure source package in Oracular:
  Invalid
Status in linux-azure source package in Plucky:
  Invalid
Status in linux-azure source package in Questing:
  Invalid

Bug description:
  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

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