This bug is awaiting verification that the linux-gcp/6.11.0-1017.17
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-oracular-linux-gcp' to 'verification-done-
oracular-linux-gcp'. If the problem still exists, change the tag
'verification-needed-oracular-linux-gcp' to 'verification-failed-
oracular-linux-gcp'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-oracular-linux-gcp-v2 
verification-needed-oracular-linux-gcp

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

Title:
  Fix HLT logic execution for TDX VMs

Status in linux-gcp package in Ubuntu:
  New
Status in linux-gcp source package in Noble:
  Fix Committed
Status in linux-gcp source package in Oracular:
  Fix Committed

Bug description:
  SRU Justification

  [Impact]
  Google has requested a backport of the following commits:
  22cc5ca5de52 ("x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT")
  9f98a4f4e721 ("x86/tdx: Fix arch_safe_halt() execution for TDX VMs")
  Targets include 6.8 onwards.

  [Fix]
  Backport the patches as needed to noble:linux-gcp and later kernels.

  [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

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