KVM: x86: Make APICv inhibit reasons an enum and cleanup naming

Use an enum for the APICv inhibit reasons, there is no meaning behind
their values and they most definitely are not "unsigned longs".  Rename
the various params to "reason" for consistency and clarity (inhibit may
be confused as a command, i.e. inhibit APICv, instead of the reason that
is getting toggled/checked).

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220311043517.17027-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: sean-jc

arch/x86/include/asm/kvm_host.h

@@ -1042,14 +1042,16 @@ struct kvm_x86_msr_filter {
 	struct msr_bitmap_range ranges[16];
 };
 
-#define APICV_INHIBIT_REASON_DISABLE    0
-#define APICV_INHIBIT_REASON_HYPERV     1
-#define APICV_INHIBIT_REASON_NESTED     2
-#define APICV_INHIBIT_REASON_IRQWIN     3
-#define APICV_INHIBIT_REASON_PIT_REINJ  4
-#define APICV_INHIBIT_REASON_X2APIC	5
-#define APICV_INHIBIT_REASON_BLOCKIRQ	6
-#define APICV_INHIBIT_REASON_ABSENT	7
+enum kvm_apicv_inhibit {
+	APICV_INHIBIT_REASON_DISABLE,
+	APICV_INHIBIT_REASON_HYPERV,
+	APICV_INHIBIT_REASON_NESTED,
+	APICV_INHIBIT_REASON_IRQWIN,
+	APICV_INHIBIT_REASON_PIT_REINJ,
+	APICV_INHIBIT_REASON_X2APIC,
+	APICV_INHIBIT_REASON_BLOCKIRQ,
+	APICV_INHIBIT_REASON_ABSENT,
+};
 
 struct kvm_arch {
 	unsigned long n_used_mmu_pages;
@@ -1403,7 +1405,7 @@ struct kvm_x86_ops {
 	void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
 	void (*enable_irq_window)(struct kvm_vcpu *vcpu);
 	void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
-	bool (*check_apicv_inhibit_reasons)(ulong bit);
+	bool (*check_apicv_inhibit_reasons)(enum kvm_apicv_inhibit reason);
 	void (*refresh_apicv_exec_ctrl)(struct kvm_vcpu *vcpu);
 	void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
 	void (*hwapic_isr_update)(struct kvm_vcpu *vcpu, int isr);
@@ -1798,10 +1800,9 @@ gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
 bool kvm_apicv_activated(struct kvm *kvm);
 void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu);
 void kvm_request_apicv_update(struct kvm *kvm, bool activate,
-			      unsigned long bit);
-
+			      enum kvm_apicv_inhibit reason);
 void __kvm_request_apicv_update(struct kvm *kvm, bool activate,
-				unsigned long bit);
+				enum kvm_apicv_inhibit reason);
 
 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
 

arch/x86/kvm/svm/avic.c

@@ -828,7 +828,7 @@ int avic_pi_update_irte(struct kvm *kvm, unsigned int host_irq,
 	return ret;
 }
 
-bool avic_check_apicv_inhibit_reasons(ulong bit)
+bool avic_check_apicv_inhibit_reasons(enum kvm_apicv_inhibit reason)
 {
 	ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE) |
 			  BIT(APICV_INHIBIT_REASON_ABSENT) |
@@ -839,7 +839,7 @@ bool avic_check_apicv_inhibit_reasons(ulong bit)
 			  BIT(APICV_INHIBIT_REASON_X2APIC) |
 			  BIT(APICV_INHIBIT_REASON_BLOCKIRQ);
 
-	return supported & BIT(bit);
+	return supported & BIT(reason);
 }
 
 

arch/x86/kvm/svm/svm.h

@@ -594,7 +594,7 @@ void __avic_vcpu_put(struct kvm_vcpu *vcpu);
 void avic_apicv_post_state_restore(struct kvm_vcpu *vcpu);
 void avic_set_virtual_apic_mode(struct kvm_vcpu *vcpu);
 void avic_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu);
-bool avic_check_apicv_inhibit_reasons(ulong bit);
+bool avic_check_apicv_inhibit_reasons(enum kvm_apicv_inhibit reason);
 void avic_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr);
 void avic_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr);
 bool avic_dy_apicv_has_pending_interrupt(struct kvm_vcpu *vcpu);

arch/x86/kvm/trace.h

@@ -1340,22 +1340,22 @@ TRACE_EVENT(kvm_hv_stimer_cleanup,
 );
 
 TRACE_EVENT(kvm_apicv_update_request,
-	    TP_PROTO(bool activate, unsigned long bit),
-	    TP_ARGS(activate, bit),
+	    TP_PROTO(bool activate, int reason),
+	    TP_ARGS(activate, reason),
 
 	TP_STRUCT__entry(
 		__field(bool, activate)
-		__field(unsigned long, bit)
+		__field(int, reason)
 	),
 
 	TP_fast_assign(
 		__entry->activate = activate;
-		__entry->bit = bit;
+		__entry->reason = reason;
 	),
 
-	TP_printk("%s bit=%lu",
+	TP_printk("%s reason=%u",
 		  __entry->activate ? "activate" : "deactivate",
-		  __entry->bit)
+		  __entry->reason)
 );
 
 TRACE_EVENT(kvm_apicv_accept_irq,

arch/x86/kvm/vmx/vmx.c

@@ -7705,14 +7705,14 @@ static void vmx_hardware_unsetup(void)
 	free_kvm_area();
 }
 
-static bool vmx_check_apicv_inhibit_reasons(ulong bit)
+static bool vmx_check_apicv_inhibit_reasons(enum kvm_apicv_inhibit reason)
 {
 	ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE) |
 			  BIT(APICV_INHIBIT_REASON_ABSENT) |
 			  BIT(APICV_INHIBIT_REASON_HYPERV) |
 			  BIT(APICV_INHIBIT_REASON_BLOCKIRQ);
 
-	return supported & BIT(bit);
+	return supported & BIT(reason);
 }
 
 static struct kvm_x86_ops vmx_x86_ops __initdata = {

arch/x86/kvm/x86.c

@@ -9744,24 +9744,25 @@ void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvm_vcpu_update_apicv);
 
-void __kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
+void __kvm_request_apicv_update(struct kvm *kvm, bool activate,
+				enum kvm_apicv_inhibit reason)
 {
 	unsigned long old, new;
 
 	lockdep_assert_held_write(&kvm->arch.apicv_update_lock);
 
-	if (!static_call(kvm_x86_check_apicv_inhibit_reasons)(bit))
+	if (!static_call(kvm_x86_check_apicv_inhibit_reasons)(reason))
 		return;
 
 	old = new = kvm->arch.apicv_inhibit_reasons;
 
 	if (activate)
-		__clear_bit(bit, &new);
+		__clear_bit(reason, &new);
 	else
-		__set_bit(bit, &new);
+		__set_bit(reason, &new);
 
 	if (!!old != !!new) {
-		trace_kvm_apicv_update_request(activate, bit);
+		trace_kvm_apicv_update_request(activate, reason);
 		/*
 		 * Kick all vCPUs before setting apicv_inhibit_reasons to avoid
 		 * false positives in the sanity check WARN in svm_vcpu_run().
@@ -9780,17 +9781,19 @@ void __kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
 			unsigned long gfn = gpa_to_gfn(APIC_DEFAULT_PHYS_BASE);
 			kvm_zap_gfn_range(kvm, gfn, gfn+1);
 		}
-	} else
+	} else {
 		kvm->arch.apicv_inhibit_reasons = new;
+	}
 }
 
-void kvm_request_apicv_update(struct kvm *kvm, bool activate, ulong bit)
+void kvm_request_apicv_update(struct kvm *kvm, bool activate,
+			      enum kvm_apicv_inhibit reason)
 {
 	if (!enable_apicv)
 		return;
 
 	down_write(&kvm->arch.apicv_update_lock);
-	__kvm_request_apicv_update(kvm, activate, bit);
+	__kvm_request_apicv_update(kvm, activate, reason);
 	up_write(&kvm->arch.apicv_update_lock);
 }
 EXPORT_SYMBOL_GPL(kvm_request_apicv_update);