APIC: Do not start zero-period timers (Jan Kiszka)
The APIC timer must not start when the initial count is (still) zero. This caused occasional stalls when booting secondary CPUs of Linux SMP guests. Signed-off-by: Jan Kiszka <jan.kiszka@web.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5024 c046a42c-6fe2-441c-8c8c-71466251a162
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@ -566,6 +566,8 @@ static void apic_timer_update(APICState *s, int64_t current_time)
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d = (current_time - s->initial_count_load_time) >>
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s->count_shift;
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if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
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if (!s->initial_count)
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goto no_timer;
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d = ((d / ((uint64_t)s->initial_count + 1)) + 1) * ((uint64_t)s->initial_count + 1);
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} else {
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if (d >= s->initial_count)
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