Revert "x86/IO-APIC: fix setup of Xen internally used IRQs"

This reverts commit 1126b40892,
as it breaks (at least) x2apic systems.

xen/arch/x86/io_apic.c

@@ -2201,7 +2201,6 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
 {
     struct irq_desc *desc = irq_to_desc(irq);
     struct IO_APIC_route_entry entry;
-    cpumask_t mask;
     unsigned long flags;
     int vector;
 
@@ -2221,6 +2220,7 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
 
     entry.delivery_mode = INT_DELIVERY_MODE;
     entry.dest_mode = INT_DEST_MODE;
+    SET_DEST(entry, logical, cpu_mask_to_apicid(TARGET_CPUS));
     entry.trigger = edge_level;
     entry.polarity = active_high_low;
     entry.mask  = 1;
@@ -2236,9 +2236,6 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
         return vector;
     entry.vector = vector;
 
-    cpumask_and(&mask, desc->arch.cpu_mask, TARGET_CPUS);
-    SET_DEST(entry, logical, cpu_mask_to_apicid(&mask));
-
     apic_printk(APIC_DEBUG, KERN_DEBUG "IOAPIC[%d]: Set PCI routing entry "
 		"(%d-%d -> %#x -> IRQ %d Mode:%i Active:%i)\n", ioapic,
 		mp_ioapics[ioapic].mpc_apicid, pin, entry.vector, irq,

xen/arch/x86/smpboot.c

@@ -1084,7 +1084,7 @@ void __init smp_intr_init(void)
         vector = alloc_hipriority_vector();
         per_cpu(vector_irq, cpu)[vector] = irq;
         irq_to_desc(irq)->arch.vector = vector;
-        cpumask_setall(irq_to_desc(irq)->arch.cpu_mask);
+        cpumask_copy(irq_to_desc(irq)->arch.cpu_mask, &cpu_online_map);
     }
 
     /* Direct IPI vectors. */