apic: Resolve potential endless loop around apic_update_irq
Commit d96e1737 refactored the reinjection of pending PIC interrupts. However, it missed the potential loop of apic_update_irq -> apic_deliver_pic_intr -> apic_local_deliver -> apic_set_irq -> apic_update_irq that /could/ occur if LINT0 is injected as APIC_DM_FIXED and that vector is currently blocked via TPR. Resolve this by reinjecting only where it matters: inside apic_get_interrupt. This function may clear a vector while a PIC-originated reason still exists. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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