linux-kernel - [tip: x86/cpu] x86/cpu: X86_FEATURE_INTEL

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Date:   Wed, 02 Feb 2022 06:31:15 -0000
From:   "tip-bot2 for Tony Luck" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...e.de>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/cpu] x86/cpu: X86_FEATURE_INTEL_PPIN finally has a CPUID bit

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     00a2f23eef7d1fa6c2dfdc613857b84fbf5e2b3b
Gitweb:        https://git.kernel.org/tip/00a2f23eef7d1fa6c2dfdc613857b84fbf5e2b3b
Author:        Tony Luck <tony.luck@...el.com>
AuthorDate:    Mon, 31 Jan 2022 15:01:08 -08:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Tue, 01 Feb 2022 16:15:19 +01:00

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@...el.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lore.kernel.org/r/20220131230111.2004669-3-tony.luck@intel.com
---
 arch/x86/kernel/cpu/common.c    | 1 +
 arch/x86/kernel/cpu/scattered.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index b0bd8a6..0681c69 100644
--- 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
--- 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 },