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;
}
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 {