xen/x86-ioapic-ack-default.patch

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Change default IO-APIC ack mode for single IO-APIC systems to old-style.
--- a/xen/arch/x86/io_apic.c
+++ b/xen/arch/x86/io_apic.c
@@ -2074,7 +2074,10 @@ void __init setup_IO_APIC(void)
io_apic_irqs = ~PIC_IRQS;
printk("ENABLING IO-APIC IRQs\n");
- printk(" -> Using %s ACK method\n", ioapic_ack_new ? "new" : "old");
+ if (!directed_eoi_enabled && !ioapic_ack_forced) {
+ ioapic_ack_new = (nr_ioapics > 1);
+ printk(" -> Using %s ACK method\n", ioapic_ack_new ? "new" : "old");
+ }
if (ioapic_ack_new) {
ioapic_level_type.ack = irq_complete_move;