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d9bb405446
On systems that enumerate PPIN (protected processor inventory number) using CPUID, but where the BIOS locked the MSR to prevent access /proc/cpuinfo reports "intel_ppin" feature as present on all logical CPUs except for CPU 0. This happens because ppin_init() uses x86_match_cpu() to determine whether PPIN is supported. When called on CPU 0 the test for locked PPIN MSR results in: clear_cpu_cap(c, info->feature); This clears the X86 FEATURE bit in boot_cpu_data. When other CPUs are brought online the x86_match_cpu() fails, and the PPIN FEATURE bit remains set for those other CPUs. Fix by using setup_clear_cpu_cap() instead of clear_cpu_cap() which force clears the FEATURE bit for all CPUS. Reported-by: Adeel Ashad <adeel.arshad@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20241122234212.27451-1-tony.luck@intel.com |
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