KVM: x86: Stub out is_tdp_mmu_root on 32-bit hosts

If is_tdp_mmu_root is not inlined, the elimination of TDP MMU calls as dead
code might not work out.  To avoid this, explicitly declare the stubbed
is_tdp_mmu_root on 32-bit hosts.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/tdp_mmu.h

@@ -85,12 +85,6 @@ bool kvm_mmu_init_tdp_mmu(struct kvm *kvm);
 void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm);
 static inline bool is_tdp_mmu_enabled(struct kvm *kvm) { return kvm->arch.tdp_mmu_enabled; }
 static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return sp->tdp_mmu_page; }
-#else
-static inline bool kvm_mmu_init_tdp_mmu(struct kvm *kvm) { return false; }
-static inline void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm) {}
-static inline bool is_tdp_mmu_enabled(struct kvm *kvm) { return false; }
-static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return false; }
-#endif
 
 static inline bool is_tdp_mmu_root(struct kvm *kvm, hpa_t hpa)
 {
@@ -107,5 +101,12 @@ static inline bool is_tdp_mmu_root(struct kvm *kvm, hpa_t hpa)
 
 	return is_tdp_mmu_page(sp) && sp->root_count;
 }
+#else
+static inline bool kvm_mmu_init_tdp_mmu(struct kvm *kvm) { return false; }
+static inline void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm) {}
+static inline bool is_tdp_mmu_enabled(struct kvm *kvm) { return false; }
+static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return false; }
+static inline bool is_tdp_mmu_root(hpa_t hpa) { return false; }
+#endif
 
 #endif /* __KVM_X86_MMU_TDP_MMU_H */