KVM: arm64: vgic-its: Introduce config option to guard ITS specific code

By now ITS code guarded with KVM_ARM_VGIC_V3 config option which was
introduced to hide everything specific to vgic-v3 from 32-bit world.
We are going to support vgic-v3 in 32-bit world and KVM_ARM_VGIC_V3
will gone, but we don't have support for ITS there yet and we need to
continue keeping ITS away.
Introduce the new config option to prevent ITS code being build in
32-bit mode when support for vgic-v3 is done.

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

4 files changed, 13 insertions, 0 deletions

diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 9c9edc98d271..7ba91647d1c5 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -16,6 +16,9 @@ menuconfig VIRTUALIZATION
 
 if VIRTUALIZATION
 
+config KVM_ARM_VGIC_V3_ITS
+        bool
+
 config KVM_ARM_VGIC_V3
         bool
 
@@ -35,6 +38,7 @@ config KVM
         select HAVE_KVM_EVENTFD
         select HAVE_KVM_IRQFD
         select KVM_ARM_VGIC_V3
+        select KVM_ARM_VGIC_V3_ITS
         select KVM_ARM_PMU if HW_PERF_EVENTS
         select HAVE_KVM_MSI
         select HAVE_KVM_IRQCHIP
diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c
index 163b0578efc7..89ef9bcc6de6 100644
--- a/virt/kvm/arm/vgic/vgic-kvm-device.c
+++ b/virt/kvm/arm/vgic/vgic-kvm-device.c
@@ -223,9 +223,12 @@ int kvm_register_vgic_device(unsigned long type)
         case KVM_DEV_TYPE_ARM_VGIC_V3:
                 ret = kvm_register_device_ops(&kvm_arm_vgic_v3_ops,
                                               KVM_DEV_TYPE_ARM_VGIC_V3);
+
+#ifdef CONFIG_KVM_ARM_VGIC_V3_ITS
                 if (ret)
                         break;
                 ret = kvm_vgic_register_its_device();
+#endif
                 break;
 #endif
         }
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index 90d81811fdda..acbe6915d657 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -42,6 +42,7 @@ u64 update_64bit_reg(u64 reg, unsigned int offset, unsigned int len,
         return reg | ((u64)val << lower);
 }
 
+#ifdef CONFIG_KVM_ARM_VGIC_V3_ITS
 bool vgic_has_its(struct kvm *kvm)
 {
         struct vgic_dist *dist = &kvm->arch.vgic;
@@ -51,6 +52,7 @@ bool vgic_has_its(struct kvm *kvm)
 
         return dist->has_its;
 }
+#endif
 
 static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu,
                                             gpa_t addr, unsigned int len)
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 6c4625c46368..100045f3d98a 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -84,11 +84,15 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu);
 int vgic_v3_probe(const struct gic_kvm_info *info);
 int vgic_v3_map_resources(struct kvm *kvm);
 int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t dist_base_address);
+
+#ifdef CONFIG_KVM_ARM_VGIC_V3_ITS
 int vgic_register_its_iodevs(struct kvm *kvm);
 bool vgic_has_its(struct kvm *kvm);
 int kvm_vgic_register_its_device(void);
 void vgic_enable_lpis(struct kvm_vcpu *vcpu);
 int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi);
+#endif
+
 #else
 static inline void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu)
 {