KVM: x86: Make return for {interrupt_nmi,smi}_allowed() a bool instead of int

Return an actual bool for kvm_x86_ops' {interrupt_nmi}_allowed() hook to
better reflect the return semantics, and to avoid creating an even
bigger mess when the related VMX code is refactored in upcoming patches.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200423022550.15113-5-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -1138,8 +1138,8 @@ struct kvm_x86_ops {
 	void (*set_nmi)(struct kvm_vcpu *vcpu);
 	void (*queue_exception)(struct kvm_vcpu *vcpu);
 	void (*cancel_injection)(struct kvm_vcpu *vcpu);
-	int (*interrupt_allowed)(struct kvm_vcpu *vcpu);
-	int (*nmi_allowed)(struct kvm_vcpu *vcpu);
+	bool (*interrupt_allowed)(struct kvm_vcpu *vcpu);
+	bool (*nmi_allowed)(struct kvm_vcpu *vcpu);
 	bool (*get_nmi_mask)(struct kvm_vcpu *vcpu);
 	void (*set_nmi_mask)(struct kvm_vcpu *vcpu, bool masked);
 	void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
@@ -1237,7 +1237,7 @@ struct kvm_x86_ops {
 
 	void (*setup_mce)(struct kvm_vcpu *vcpu);
 
-	int (*smi_allowed)(struct kvm_vcpu *vcpu);
+	bool (*smi_allowed)(struct kvm_vcpu *vcpu);
 	int (*pre_enter_smm)(struct kvm_vcpu *vcpu, char *smstate);
 	int (*pre_leave_smm)(struct kvm_vcpu *vcpu, const char *smstate);
 	int (*enable_smi_window)(struct kvm_vcpu *vcpu);

arch/x86/kvm/svm/svm.c

@@ -3065,11 +3065,11 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
 		set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
 }
 
-static int svm_nmi_allowed(struct kvm_vcpu *vcpu)
+static bool svm_nmi_allowed(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 	struct vmcb *vmcb = svm->vmcb;
-	int ret;
+	bool ret;
 
 	ret = !(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) &&
 	      !(svm->vcpu.arch.hflags & HF_NMI_MASK);
@@ -3098,14 +3098,14 @@ static void svm_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
 	}
 }
 
-static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
+static bool svm_interrupt_allowed(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 	struct vmcb *vmcb = svm->vmcb;
 
 	if (!gif_set(svm) ||
 	     (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK))
-		return 0;
+		return false;
 
 	if (is_guest_mode(vcpu) && (svm->vcpu.arch.hflags & HF_VINTR_MASK))
 		return !!(svm->vcpu.arch.hflags & HF_HIF_MASK);
@@ -3767,23 +3767,23 @@ static void svm_setup_mce(struct kvm_vcpu *vcpu)
 	vcpu->arch.mcg_cap &= 0x1ff;
 }
 
-static int svm_smi_allowed(struct kvm_vcpu *vcpu)
+static bool svm_smi_allowed(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 
 	/* Per APM Vol.2 15.22.2 "Response to SMI" */
 	if (!gif_set(svm))
-		return 0;
+		return false;
 
 	if (is_guest_mode(&svm->vcpu) &&
 	    svm->nested.intercept & (1ULL << INTERCEPT_SMI)) {
 		/* TODO: Might need to set exit_info_1 and exit_info_2 here */
 		svm->vmcb->control.exit_code = SVM_EXIT_SMI;
 		svm->nested.exit_required = true;
-		return 0;
+		return false;
 	}
 
-	return 1;
+	return true;
 }
 
 static int svm_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)

arch/x86/kvm/vmx/vmx.c

@@ -4510,21 +4510,21 @@ void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
 	}
 }
 
-static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
+static bool vmx_nmi_allowed(struct kvm_vcpu *vcpu)
 {
 	if (to_vmx(vcpu)->nested.nested_run_pending)
-		return 0;
+		return false;
 
 	if (!enable_vnmi &&
 	    to_vmx(vcpu)->loaded_vmcs->soft_vnmi_blocked)
-		return 0;
+		return false;
 
 	return	!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
 		  (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI
 		   | GUEST_INTR_STATE_NMI));
 }
 
-static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
+static bool vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
 {
 	if (to_vmx(vcpu)->nested.nested_run_pending)
 		return false;
@@ -7675,12 +7675,12 @@ static void vmx_setup_mce(struct kvm_vcpu *vcpu)
 			~FEAT_CTL_LMCE_ENABLED;
 }
 
-static int vmx_smi_allowed(struct kvm_vcpu *vcpu)
+static bool vmx_smi_allowed(struct kvm_vcpu *vcpu)
 {
 	/* we need a nested vmexit to enter SMM, postpone if run is pending */
 	if (to_vmx(vcpu)->nested.nested_run_pending)
-		return 0;
-	return 1;
+		return false;
+	return true;
 }
 
 static int vmx_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)