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On s390x, we can neither exit via PIO nor MMIO, but have to use an instruction like DIAGNOSE. Now that ucall() is implemented, we can use it in the sync_reg_test on s390x, too. Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com> Link: https://lore.kernel.org/r/20190731151525.17156-3-thuth@redhat.com Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>