[SRU][N:linux-gke][PATCH 0/2] Fix HLT logic execution for TDX VMs

[Ian Whitfield]

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

[Impact]
GKE has requested confidential VM patchset parity with linux-gcp. This patchset
was originally applied on noble:linux-gcp and oracular:linux-gcp, and is now
being applied on noble:linux-gke.

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")

[Fix]
Noble required both patches. Upstream stable backports were used for both
patches, and these applied cleanly.

[Test plan]
Compile and boot test. These patches have been in linux-gcp for a few cycles.

[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.

Kirill A. Shutemov (1):
  x86/paravirt: Move halt paravirt calls under CONFIG_PARAVIRT

Vishal Annapurve (1):
  x86/tdx: Fix arch_safe_halt() execution for TDX VMs

 arch/x86/Kconfig                      |  1 +
 arch/x86/coco/tdx/tdx.c               | 26 ++++++++++++++++-
 arch/x86/include/asm/irqflags.h       | 40 +++++++++++++++------------
 arch/x86/include/asm/paravirt.h       | 20 +++++++-------
 arch/x86/include/asm/paravirt_types.h |  3 +-
 arch/x86/include/asm/tdx.h            |  4 +--
 arch/x86/kernel/paravirt.c            | 14 ++++++----
 arch/x86/kernel/process.c             |  2 +-
 8 files changed, 70 insertions(+), 40 deletions(-)

-- 
2.43.0