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s390x/tcg: SET CLOCK COMPARATOR can clear CKC interrupts

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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>
This commit is contained in:
David Hildenbrand 2018-06-27 15:44:07 +02:00 committed by Cornelia Huck
parent 7de3b1cdc6
commit 345f1ab96e
1 changed files with 7 additions and 0 deletions
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7
target/s390x/misc_helper.c
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@ -154,6 +154,13 @@ void HELPER(sckc)(CPUS390XState *env, uint64_t time)
{
S390TODState *td = s390_get_todstate();
/* stop the timer and remove pending CKC IRQs */
timer_del(env->tod_timer);
qemu_mutex_lock_iothread();
env->pending_int &= ~INTERRUPT_EXT_CLOCK_COMPARATOR;
qemu_mutex_unlock_iothread();
/* the tod has to exceed the ckc, this can never happen if ckc is all 1's */
if (time == -1ULL) {
return;
}