Public bug reported:

SRU Justification

[Impact]
Google has requested a backport of the following patchset:
https://lore.kernel.org/all/20250228014416.3925664-1-vannapu...@google.com/
Targets include 6.8 onwards.

[Fix]
Backport the three patches in that patchset, as needed, to noble:linux-gcp, 
oracular:linux-gcp, and plucky:linux-gcp.

[Test plan]
Compile and boot test. Verification on Google's side is optional as this is a 
fairly isolated backport.

[Where problems could occur]
This fix affects TDX guest VMs which call the HLT instruction. An issue with 
this fix would be visible to the user as unexpected #VEs (virtualization 
exceptions) or unexpected interrupt behavior in their TDX guest VM.

[Other]
SF #00412211

** Affects: linux-gcp (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-gcp (Ubuntu Noble)
     Importance: Undecided
         Status: New

** Affects: linux-gcp (Ubuntu Oracular)
     Importance: Undecided
         Status: New

** Affects: linux-gcp (Ubuntu Plucky)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2112602

Title:
  Fix HLT logic execution for TDX VMs

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