s390x/kvm: add interface for clearing IO irqs
According to the platform specification, under certain conditions, pending IO interruptions have to be cleared. Let's add an interface for that. Signed-off-by: NHalil Pasic <pasic@linux.vnet.ibm.com> Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
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