linux-kernel - [PATCH 04/13] KVM: x86: Make return for {interrupt_nmi}

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Date:   Wed, 22 Apr 2020 19:25:41 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Oliver Upton <oupton@...gle.com>,
        Peter Shier <pshier@...gle.com>
Subject: [PATCH 04/13] KVM: x86: Make return for {interrupt_nmi}_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@...el.com>
---
 arch/x86/include/asm/kvm_host.h | 4 ++--
 arch/x86/kvm/svm/svm.c          | 9 +++++----
 arch/x86/kvm/vmx/vmx.c          | 8 ++++----
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 65dc2c88d8b2..787636acd648 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1139,8 +1139,8 @@ 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);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index eb95283ab68d..f21f734861dd 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3062,11 +3062,12 @@ 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);
 	ret = ret && gif_set(svm) && nested_svm_nmi(svm);
@@ -3094,14 +3095,14 @@ 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);
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 766303b31949..7dd42e7fef94 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4511,21 +4511,21 @@ 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;
-- 
2.26.0