KVM: x86: Rename irqchip_kernel() to irqchip_full()

Rename irqchip_kernel() to irqchip_full(), as "kernel" is very ambiguous
due to the existence of split IRQ chip support, where only some of the
"irqchip" is in emulated by the kernel/KVM.  E.g. irqchip_kernel() often
gets confused with irqchip_in_kernel().

Opportunistically hoist the definition up in irq.h so that it's
co-located with other "full" irqchip code in anticipation of wrapping it
all with a Kconfig/#ifdef.

No functional change intended.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20250611213557.294358-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

arch/x86/kvm/ioapic.h

@@ -103,7 +103,7 @@ do {									\
 
 static inline int ioapic_in_kernel(struct kvm *kvm)
 {
-	return irqchip_kernel(kvm);
+	return irqchip_full(kvm);
 }
 
 void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu);

arch/x86/kvm/irq.c

@@ -172,7 +172,7 @@ bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args)
 {
 	bool resample = args->flags & KVM_IRQFD_FLAG_RESAMPLE;
 
-	return resample ? irqchip_kernel(kvm) : irqchip_in_kernel(kvm);
+	return resample ? irqchip_full(kvm) : irqchip_in_kernel(kvm);
 }
 
 bool kvm_arch_irqchip_in_kernel(struct kvm *kvm)

arch/x86/kvm/irq.h

@@ -69,27 +69,27 @@ int kvm_pic_set_irq(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
 int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip);
 int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip);
 
-static inline int irqchip_split(struct kvm *kvm)
+static inline int irqchip_full(struct kvm *kvm)
 {
 	int mode = kvm->arch.irqchip_mode;
 
 	/* Matches smp_wmb() when setting irqchip_mode */
 	smp_rmb();
-	return mode == KVM_IRQCHIP_SPLIT;
+	return mode == KVM_IRQCHIP_KERNEL;
+}
+
+static inline int pic_in_kernel(struct kvm *kvm)
+{
+	return irqchip_full(kvm);
 }
 
-static inline int irqchip_kernel(struct kvm *kvm)
+static inline int irqchip_split(struct kvm *kvm)
 {
 	int mode = kvm->arch.irqchip_mode;
 
 	/* Matches smp_wmb() when setting irqchip_mode */
 	smp_rmb();
-	return mode == KVM_IRQCHIP_KERNEL;
-}
-
-static inline int pic_in_kernel(struct kvm *kvm)
-{
-	return irqchip_kernel(kvm);
+	return mode == KVM_IRQCHIP_SPLIT;
 }
 
 static inline int irqchip_in_kernel(struct kvm *kvm)

arch/x86/kvm/irq_comm.c

@@ -200,7 +200,7 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id)
 		goto unlock;
 	}
 	clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap);
-	if (!irqchip_kernel(kvm))
+	if (!irqchip_full(kvm))
 		goto unlock;
 
 	kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id);

arch/x86/kvm/x86.c

@@ -7039,7 +7039,7 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 		}
 
 		r = -ENXIO;
-		if (!irqchip_kernel(kvm))
+		if (!irqchip_full(kvm))
 			goto get_irqchip_out;
 		r = kvm_vm_ioctl_get_irqchip(kvm, chip);
 		if (r)
@@ -7063,7 +7063,7 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 		}
 
 		r = -ENXIO;
-		if (!irqchip_kernel(kvm))
+		if (!irqchip_full(kvm))
 			goto set_irqchip_out;
 		r = kvm_vm_ioctl_set_irqchip(kvm, chip);
 	set_irqchip_out: