linux-kernel - [PATCH] KVM: update depracated and inappropriate jump label API

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Message-Id: <20210116055009.118377-1-cun.jia.li@gmail.com>
Date:   Sat, 16 Jan 2021 13:50:09 +0800
From:   Cun Li <cun.jia.li@...il.com>
To:     vkuznets@...hat.com
Cc:     pbonzini@...hat.com, seanjc@...gle.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Cun Li <cun.jia.li@...il.com>
Subject: [PATCH] KVM: update depracated and inappropriate jump label API

The use of 'struct static_key' and 'static_key_false' is
deprecated. Use the new API.

mmu_audit_key can only be true or false so it would be nice to use
static_branch_enable()/static_branch_disable() for it and not
static_key_slow_inc()/static_key_slow_dec().

Signed-off-by: Cun Li <cun.jia.li@...il.com>
---
 arch/x86/kvm/lapic.h         | 6 +++---
 arch/x86/kvm/mmu/mmu_audit.c | 8 ++++----
 arch/x86/kvm/x86.c           | 6 +++---
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 4fb86e3a9dd3..b7aa76e2678e 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -176,7 +176,7 @@ extern struct static_key kvm_no_apic_vcpu;
 
 static inline bool lapic_in_kernel(struct kvm_vcpu *vcpu)
 {
-	if (static_key_false(&kvm_no_apic_vcpu))
+	if (static_branch_unlikely(&kvm_no_apic_vcpu))
 		return vcpu->arch.apic;
 	return true;
 }
@@ -185,7 +185,7 @@ extern struct static_key_deferred apic_hw_disabled;
 
 static inline int kvm_apic_hw_enabled(struct kvm_lapic *apic)
 {
-	if (static_key_false(&apic_hw_disabled.key))
+	if (static_branch_unlikely(&apic_hw_disabled.key))
 		return apic->vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE;
 	return MSR_IA32_APICBASE_ENABLE;
 }
@@ -194,7 +194,7 @@ extern struct static_key_deferred apic_sw_disabled;
 
 static inline bool kvm_apic_sw_enabled(struct kvm_lapic *apic)
 {
-	if (static_key_false(&apic_sw_disabled.key))
+	if (static_branch_unlikely(&apic_sw_disabled.key))
 		return apic->sw_enabled;
 	return true;
 }
diff --git a/arch/x86/kvm/mmu/mmu_audit.c b/arch/x86/kvm/mmu/mmu_audit.c
index c8d51a37e2ce..df3482784aa5 100644
--- a/arch/x86/kvm/mmu/mmu_audit.c
+++ b/arch/x86/kvm/mmu/mmu_audit.c
@@ -234,7 +234,7 @@ static void audit_vcpu_spte(struct kvm_vcpu *vcpu)
 }
 
 static bool mmu_audit;
-static struct static_key mmu_audit_key;
+static DEFINE_STATIC_KEY_FALSE(mmu_audit_key);
 
 static void __kvm_mmu_audit(struct kvm_vcpu *vcpu, int point)
 {
@@ -250,7 +250,7 @@ static void __kvm_mmu_audit(struct kvm_vcpu *vcpu, int point)
 
 static inline void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point)
 {
-	if (static_key_false((&mmu_audit_key)))
+	if (static_branch_unlikely((&mmu_audit_key)))
 		__kvm_mmu_audit(vcpu, point);
 }
 
@@ -259,7 +259,7 @@ static void mmu_audit_enable(void)
 	if (mmu_audit)
 		return;
 
-	static_key_slow_inc(&mmu_audit_key);
+	static_branch_enable(&mmu_audit_key);
 	mmu_audit = true;
 }
 
@@ -268,7 +268,7 @@ static void mmu_audit_disable(void)
 	if (!mmu_audit)
 		return;
 
-	static_key_slow_dec(&mmu_audit_key);
+	static_branch_disable(&mmu_audit_key);
 	mmu_audit = false;
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9a8969a6dd06..6f460c3b8fb8 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9955,7 +9955,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 		if (kvm_apicv_activated(vcpu->kvm))
 			vcpu->arch.apicv_active = true;
 	} else
-		static_key_slow_inc(&kvm_no_apic_vcpu);
+		static_branch_inc(&kvm_no_apic_vcpu);
 
 	r = -ENOMEM;
 
@@ -10084,7 +10084,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
 	free_page((unsigned long)vcpu->arch.pio_data);
 	kvfree(vcpu->arch.cpuid_entries);
 	if (!lapic_in_kernel(vcpu))
-		static_key_slow_dec(&kvm_no_apic_vcpu);
+		static_branch_dec(&kvm_no_apic_vcpu);
 }
 
 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
@@ -10339,7 +10339,7 @@ bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 	return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0;
 }
 
-struct static_key kvm_no_apic_vcpu __read_mostly;
+__read_mostly DEFINE_STATIC_KEY_FALSE(kvm_no_apic_vcpu);
 EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu);
 
 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
-- 
2.25.1