s390x/tcg: SET CLOCK COMPARATOR can clear CKC interrupts
Let's stop the timer and delete any pending CKC IRQ before doing anything else. While at it, add a comment why the check for ckc == -1ULL is needed. Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20180627134410.4901-7-david@redhat.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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@ -154,6 +154,13 @@ void HELPER(sckc)(CPUS390XState *env, uint64_t time)
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{
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S390TODState *td = s390_get_todstate();
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/* stop the timer and remove pending CKC IRQs */
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timer_del(env->tod_timer);
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qemu_mutex_lock_iothread();
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env->pending_int &= ~INTERRUPT_EXT_CLOCK_COMPARATOR;
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qemu_mutex_unlock_iothread();
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/* the tod has to exceed the ckc, this can never happen if ckc is all 1's */
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if (time == -1ULL) {
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return;
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}
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