Index: xen-3.3.1-testing/xen/arch/x86/io_apic.c
===================================================================
--- xen-3.3.1-testing.orig/xen/arch/x86/io_apic.c
+++ xen-3.3.1-testing/xen/arch/x86/io_apic.c
@@ -45,7 +45,7 @@
 int (*ioapic_renumber_irq)(int ioapic, int irq);
 atomic_t irq_mis_count;
 
-int msi_enable = 0;
+int msi_enable = 1;
 boolean_param("msi", msi_enable);
 
 /* Where if anywhere is the i8259 connect in external int mode */