ITS_NO is a synthetic bit that indicates to a guest VM that it is
running on hardware that A) is not vulnerable to ITS vulnerability and
B) will not be migrated to a host that is vulnerable to ITS.

Guests will use ITS_NO to opt out of mitigating against ITS.

Intel Sapphire Rapids and higher are all invulnerable to ITS.

Note: for posterity, add MSR_ARCH_CAP_ITS_NO bit definition, such that
future CPU models can add ITS_NO without needing a sub version for
its-no.

Jon Kohler (5):
  target/i386: Add MSR_IA32_ARCH_CAPABILITIES ITS_NO
  target/i386: introduce SapphireRapids-v5 to expose ITS_NO
  target/i386: introduce GraniteRapids-v4 to expose ITS_NO
  target/i386: introduce SierraForest-v4 to expose ITS_NO
  target/i386: introduce ClearwaterForest-v2 to expose ITS_NO

 target/i386/cpu.c | 35 +++++++++++++++++++++++++++++++++++
 target/i386/cpu.h |  1 +
 2 files changed, 36 insertions(+)

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2.43.0