KVM: s390: introduce and use kvm_s390_test_cpuflags()

Use it just like kvm_s390_set_cpuflags() and kvm_s390_clear_cpuflags().

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180123170531.13687-5-david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

arch/s390/kvm/interrupt.c

@@ -36,7 +36,7 @@ static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
 {
 	int c, scn;
 
-	if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
+	if (!kvm_s390_test_cpuflags(vcpu, CPUSTAT_ECALL_PEND))
 		return 0;
 
 	BUG_ON(!kvm_s390_use_sca_entries());