[SRU Focal, Jammy, OEM-5.17, OEM-6.0, OEM-6.1, Kinetic, Lunar 0/1] LP: #2023220

[Thadeu Lima de Souza Cascardo]

[Impact]
When PCIDs are enabled on Alder Lake and Raptor Lake, INVLPG will not flush
the global TLB entries. This can lead to info leak or undefined behavior.

[Mitigation]
Boot with nopcid on affected systems.

[Backports]
Clean cherry-pick, except for 5.4, where backport from linux-5.4.y was picked.

[Test case]
There is no particular test case.

[Potential regressions]
This affects performance on the affected systems. TLB behavior could also be
affected.

Dave Hansen (1):
  x86/mm: Avoid incomplete Global INVLPG flushes

 arch/x86/include/asm/intel-family.h |  5 +++++
 arch/x86/mm/init.c                  | 25 +++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

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2.34.1