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Currently, the PPIN (Protected Processor Inventory Number) MSR is read
by every CPU that processes a machine check, CMCI, or just polls machine
check banks from a periodic timer. This is not a "fast" MSR, so this
adds to overhead of processing errors.
Add a new "ppin" field to the cpuinfo_x86 structure. Read and save the
PPIN during initialization. Use this copy in mce_setup() instead of
reading the MSR.
Signed-off-by: Tony Luck <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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