KVM: VMX: Split out architectural interrupt/NMI blocking checks

Move the architectural (non-KVM specific) interrupt/NMI blocking checks
to a separate helper so that they can be used in a future patch by
vmx_check_nested_events().

No functional change intended.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200423022550.15113-8-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/vmx.c

@@ -4510,21 +4510,35 @@ void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
 	}
 }
 
+bool vmx_nmi_blocked(struct kvm_vcpu *vcpu)
+{
+	if (is_guest_mode(vcpu) && nested_exit_on_nmi(vcpu))
+		return false;
+
+	if (!enable_vnmi && to_vmx(vcpu)->loaded_vmcs->soft_vnmi_blocked)
+		return true;
+
+	return (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
+		(GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI |
+		 GUEST_INTR_STATE_NMI));
+}
+
 static bool vmx_nmi_allowed(struct kvm_vcpu *vcpu)
 {
 	if (to_vmx(vcpu)->nested.nested_run_pending)
 		return false;
 
-	if (is_guest_mode(vcpu) && nested_exit_on_nmi(vcpu))
-		return true;
+	return !vmx_nmi_blocked(vcpu);
+}
 
-	if (!enable_vnmi &&
-	    to_vmx(vcpu)->loaded_vmcs->soft_vnmi_blocked)
+bool vmx_interrupt_blocked(struct kvm_vcpu *vcpu)
+{
+	if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu))
 		return false;
 
-	return	!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
-		  (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI
-		   | GUEST_INTR_STATE_NMI));
+	return !(vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) ||
+	       (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
+		(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
 }
 
 static bool vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
@@ -4532,12 +4546,7 @@ static bool vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
 	if (to_vmx(vcpu)->nested.nested_run_pending)
 		return false;
 
-	if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu))
-		return true;
-
-	return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
-		!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
-			(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
+	return !vmx_interrupt_blocked(vcpu);
 }
 
 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)

arch/x86/kvm/vmx/vmx.h

@@ -344,6 +344,8 @@ void vmx_set_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
 u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa);
 void update_exception_bitmap(struct kvm_vcpu *vcpu);
 void vmx_update_msr_bitmap(struct kvm_vcpu *vcpu);
+bool vmx_nmi_blocked(struct kvm_vcpu *vcpu);
+bool vmx_interrupt_blocked(struct kvm_vcpu *vcpu);
 bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu);
 void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked);
 void vmx_set_virtual_apic_mode(struct kvm_vcpu *vcpu);