x86/cpu: Read/save PPIN MSR during initialization

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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 <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220131230111.2004669-4-tony.luck@intel.com

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Tony Luck 2022-01-31 15:01:09 -08:00 • committed by Borislav Petkov

parent 00a2f23eef

commit 822ccfade5

3 changed files with 7 additions and 6 deletions

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2

arch/x86/include/asm/processor.h

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4

arch/x86/kernel/cpu/common.c

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7

arch/x86/kernel/cpu/mce/core.c

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