s390x/tcg: rework checking for deliverable interrupts
Currently, enabling/disabling of interrupts is not really supported. Let's improve interrupt handling code by explicitly checking for deliverable interrupts only. This is the first step. Checking for external interrupt subclasses will be done next. Signed-off-by: NDavid Hildenbrand <david@redhat.com> Message-Id: <20170928203708.9376-5-david@redhat.com> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Signed-off-by: NCornelia Huck <cohuck@redhat.com>
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