linux-kernel - [PATCH 3/3] x86/split_lock: Add Tremont family CPU models

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Date:   Thu, 16 Apr 2020 13:57:54 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Tony Luck <tony.luck@...el.com>, Ingo Molnar <mingo@...nel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Borislav Petkov <bp@...en8.de>, H Peter Anvin <hpa@...or.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [PATCH 3/3] x86/split_lock: Add Tremont family CPU models

Tremont CPUs support IA32_CORE_CAPABILITIES bits to indicate
whether speciifc SKUs have support for split lock detection.

Fixes: 6650cdd9a8cc ("x86/split_lock: Enable split lock detection by kernel")
Cc: <stable@...r.kernel.org>
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/kernel/cpu/intel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 3b43b2c91054..d559481b54a6 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -1130,6 +1130,9 @@ void switch_to_sld(unsigned long tifn)
 static const struct x86_cpu_id split_lock_cpu_ids[] __initconst = {
 	X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X,           0),
 	X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_L,           0),
+	X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT,	1),
+	X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_D,	1),
+	X86_MATCH_INTEL_FAM6_MODEL(ATOM_TREMONT_L,	1),
 	{}
 };
 
-- 
2.21.1