1.1 --- a/xen/arch/ia64/linux-xen/iosapic.c	Tue Jul 11 12:51:18 2006 -0600
     1.2 +++ b/xen/arch/ia64/linux-xen/iosapic.c	Tue Jul 11 12:53:04 2006 -0600
     1.3 @@ -1155,7 +1155,7 @@ int iosapic_guest_read(unsigned long phy
     1.4  
     1.5  int iosapic_guest_write(unsigned long physbase, unsigned int reg, u32 val)
     1.6  {
     1.7 -	unsigned int id, gsi, vec, dest, high32;
     1.8 +	unsigned int id, gsi, vec, xen_vec, dest, high32;
     1.9  	char rte_index;
    1.10  	struct iosapic *ios;
    1.11  	struct iosapic_intr_info *info;
    1.12 @@ -1185,13 +1185,17 @@ int iosapic_guest_write(unsigned long ph
    1.13  
    1.14  	/* Sanity check. Vector should be allocated before this update */
    1.15  	if ((rte_index > ios->num_rte) ||
    1.16 -	    test_bit(vec, ia64_xen_vector) ||
    1.17  	    ((vec > IA64_FIRST_DEVICE_VECTOR) &&
    1.18  	     (vec < IA64_LAST_DEVICE_VECTOR) &&
    1.19  	     (!test_bit(vec - IA64_FIRST_DEVICE_VECTOR, ia64_vector_mask))))
    1.20  	    return -EINVAL;
    1.21  
    1.22  	gsi = ios->gsi_base + rte_index;
    1.23 +	xen_vec = gsi_to_vector(gsi);
    1.24 +	if (xen_vec >= 0 && test_bit(xen_vec, ia64_xen_vector)) {
    1.25 +		printk("WARN: GSI %d in use by Xen.\n", gsi);
    1.26 +		return -EINVAL;
    1.27 +	}
    1.28  	info = &iosapic_intr_info[vec];
    1.29  	spin_lock_irqsave(&irq_descp(vec)->lock, flags);
    1.30  	spin_lock(&iosapic_lock);