KVM: s390: make use of ipte lock

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h
index 21ee62c..f46e764 100644
--- a/arch/s390/kvm/gaccess.h
+++ b/arch/s390/kvm/gaccess.h
@@ -397,4 +397,6 @@
 	return access_guest_real(vcpu, gra, data, len, 0);
 }
 
+int ipte_lock_held(struct kvm_vcpu *vcpu);
+
 #endif /* __KVM_S390_GACCESS_H */