Ejemplo n.º 1
0
static int __init balloon_init(void)
{
#if defined(CONFIG_X86) && defined(CONFIG_XEN) 
	unsigned long pfn;
	struct page *page;
#endif

	if (!is_running_on_xen())
		return -ENODEV;

	IPRINTK("Initialising balloon driver.\n");

#ifdef CONFIG_XEN
	current_pages = min(xen_start_info->nr_pages, max_pfn);
	totalram_pages = current_pages;
#else
	current_pages = totalram_pages;
#endif
	target_pages  = current_pages;
	balloon_low   = 0;
	balloon_high  = 0;
	driver_pages  = 0UL;
	hard_limit    = ~0UL;

	init_timer(&balloon_timer);
	balloon_timer.data = 0;
	balloon_timer.function = balloon_alarm;
    
/* don't include on bare-metal & FV guest */
#if defined(CONFIG_PROC_FS) && defined(CONFIG_XEN)
	if ((balloon_pde = create_xen_proc_entry("balloon", 0644)) == NULL) {
		WPRINTK("Unable to create /proc/xen/balloon.\n");
		return -1;
	}

	balloon_pde->read_proc  = balloon_read;
	balloon_pde->write_proc = balloon_write;
#endif
    
#if defined(CONFIG_X86) && defined(CONFIG_XEN) 
	/* Initialise the balloon with excess memory space. */
	for (pfn = xen_start_info->nr_pages; pfn < max_pfn; pfn++) {
		page = pfn_to_page(pfn);
		balloon_append(page);
	}
#endif

	target_watch.callback = watch_target;
	xenstore_notifier.notifier_call = balloon_init_watcher;

	register_xenstore_notifier(&xenstore_notifier);
    
	return 0;
}
Ejemplo n.º 2
0
static int __devinit xenbus_probe_init(void)
#endif
{
	int err = 0;
#if defined(CONFIG_XEN) || defined(MODULE)
	unsigned long page = 0;
#endif

	DPRINTK("");

	if (!is_running_on_xen())
		return -ENODEV;

	/* Register ourselves with the kernel bus subsystem */
	xenbus_frontend.error = bus_register(&xenbus_frontend.bus);
	if (xenbus_frontend.error)
		printk(KERN_WARNING
		       "XENBUS: Error registering frontend bus: %i\n",
		       xenbus_frontend.error);
	xenbus_backend_bus_register();

	/*
	 * Domain0 doesn't have a store_evtchn or store_mfn yet.
	 */
	if (is_initial_xendomain()) {
#if defined(CONFIG_XEN) || defined(MODULE)
		struct evtchn_alloc_unbound alloc_unbound;

		/* Allocate page. */
		page = get_zeroed_page(GFP_KERNEL);
		if (!page)
			return -ENOMEM;

		xen_store_mfn = xen_start_info->store_mfn =
			pfn_to_mfn(virt_to_phys((void *)page) >>
				   PAGE_SHIFT);

		/* Next allocate a local port which xenstored can bind to */
		alloc_unbound.dom        = DOMID_SELF;
		alloc_unbound.remote_dom = 0;

		err = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
						  &alloc_unbound);
		if (err == -ENOSYS)
			goto err;
		BUG_ON(err);
		xen_store_evtchn = xen_start_info->store_evtchn =
			alloc_unbound.port;

#if defined(CONFIG_PROC_FS) && defined(CONFIG_XEN_PRIVILEGED_GUEST)
		/* And finally publish the above info in /proc/xen */
		xsd_kva_intf = create_xen_proc_entry("xsd_kva", 0600);
		if (xsd_kva_intf) {
			memcpy(&xsd_kva_fops, xsd_kva_intf->proc_fops,
			       sizeof(xsd_kva_fops));
			xsd_kva_fops.mmap = xsd_kva_mmap;
			xsd_kva_intf->proc_fops = &xsd_kva_fops;
			xsd_kva_intf->read_proc = xsd_kva_read;
		}
		xsd_port_intf = create_xen_proc_entry("xsd_port", 0400);
		if (xsd_port_intf)
			xsd_port_intf->read_proc = xsd_port_read;
#endif
#else
		/* dom0 not yet supported */
#endif
		xen_store_interface = mfn_to_virt(xen_store_mfn);
	} else {