linux-kernel - [PATCH v10 8/9] x86/split_lock: Set cpu_model_supports_sld to true after the existence of split lock detection is verified BSP

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Message-Id: <20200819064707.1033569-9-xiaoyao.li@intel.com>
Date:   Wed, 19 Aug 2020 14:47:06 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>, peterz@...radead.org,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [PATCH v10 8/9] x86/split_lock: Set cpu_model_supports_sld to true after the existence of split lock detection is verified BSP

It should be more resonable to set cpu_model_supports_sld to true after
BSP is verified to have feature split lock detection.

It also avoids externing the cpu_model_supports_sld when enumerate the
split lock detection in a guest via PV interface in a future patch.

Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
---
 arch/x86/kernel/cpu/intel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 5f44e0de04b9..b16f3dd9b9c2 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -1052,6 +1052,7 @@ static void __init split_lock_setup(void)
 		return;
 	}
 
+	cpu_model_supports_sld = true;
 	setup_force_cpu_cap(X86_FEATURE_SPLIT_LOCK_DETECT);
 	if (state == sld_fatal)
 		setup_force_cpu_cap(X86_FEATURE_SLD_FATAL);
@@ -1203,6 +1204,5 @@ void __init cpu_set_core_cap_bits(struct cpuinfo_x86 *c)
 		return;
 	}
 
-	cpu_model_supports_sld = true;
 	split_lock_setup();
 }
-- 
2.18.4