Add test coverage for SPEC_CTRL, which detects the bug pointed by Chao[1] when running on hosts with V_SPEC_CTRL. Note, this applies on top of the X86_FEATURE_XXX cleanup[2]. [1] https://lore.kernel.org/all/aEE4BEHAHdhNTGoG@xxxxxxxxx [2] https://lore.kernel.org/all/20250529221929.3807680-1-seanjc@xxxxxxxxxx Sean Christopherson (3): x86/msr: Treat PRED_CMD as support if CPU has SBPB x86/msr: Add a testcase to verify SPEC_CTRL exists (or not) as expected x86/msr: Add an "msr64" test configuration to validate negative cases lib/x86/msr.h | 8 ++++++-- lib/x86/processor.h | 10 ++++++++-- x86/msr.c | 34 +++++++++++++++++++++++++++++++--- x86/unittests.cfg | 7 +++++++ 4 files changed, 52 insertions(+), 7 deletions(-) base-commit: a93196db8339df0c09d900f9a465820a9d932c1b -- 2.50.0.rc0.604.gd4ff7b7c86-goog
