x86/cpu: X86_FEATURE_INTEL_PPIN finally has a CPUID bit

After nine generations of adding to model specific list of CPUs that
support PPIN (Protected Processor Inventory Number) Intel allocated
a CPUID bit to enumerate the MSRs.

CPUID(EAX=7, ECX=1).EBX bit 0 enumerates presence of MSR_PPIN_CTL and
MSR_PPIN. Add it to the "scattered" CPUID bits and add an entry to the
ppin_cpuids[] x86_match_cpu() array to catch Intel CPUs that implement
it.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220131230111.2004669-3-tony.luck@intel.com

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index b0bd8a6..0681c69 100644 (file)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -104,6 +104,7 @@ static struct ppin_info {
 
 static const struct x86_cpu_id ppin_cpuids[] = {
        X86_MATCH_FEATURE(X86_FEATURE_AMD_PPIN, &ppin_info[X86_VENDOR_AMD]),
+       X86_MATCH_FEATURE(X86_FEATURE_INTEL_PPIN, &ppin_info[X86_VENDOR_INTEL]),
 
        /* Legacy models without CPUID enumeration */
        X86_MATCH_INTEL_FAM6_MODEL(IVYBRIDGE_X, &ppin_info[X86_VENDOR_INTEL]),

diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index 21d1f06..4143b1e 100644 (file)
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -26,6 +26,7 @@ struct cpuid_bit {
 static const struct cpuid_bit cpuid_bits[] = {
        { X86_FEATURE_APERFMPERF,       CPUID_ECX,  0, 0x00000006, 0 },
        { X86_FEATURE_EPB,              CPUID_ECX,  3, 0x00000006, 0 },
+       { X86_FEATURE_INTEL_PPIN,       CPUID_EBX,  0, 0x00000007, 1 },
        { X86_FEATURE_CQM_LLC,          CPUID_EDX,  1, 0x0000000f, 0 },
        { X86_FEATURE_CQM_OCCUP_LLC,    CPUID_EDX,  0, 0x0000000f, 1 },
        { X86_FEATURE_CQM_MBM_TOTAL,    CPUID_EDX,  1, 0x0000000f, 1 },