static int __cpuinit setup_cpu_watcher(struct notifier_block *notifier,
unsigned long event, void *data)
{
unsigned int i;
static struct xenbus_watch __cpuinitdata cpu_watch = {
.node = "cpu",
.callback = handle_vcpu_hotplug_event,
.flags = XBWF_new_thread };
(void)register_xenbus_watch(&cpu_watch);
if (!is_initial_xendomain()) {
for_each_possible_cpu(i)
vcpu_hotplug(i);
printk(KERN_INFO "Brought up %ld CPUs\n",
(long)num_online_cpus());
}
return NOTIFY_DONE;
}
static int __init setup_vcpu_hotplug_event(void)
{
static struct notifier_block hotplug_cpu = {
.notifier_call = smpboot_cpu_notify };
static struct notifier_block __cpuinitdata xsn_cpu = {
.notifier_call = setup_cpu_watcher };
if (!is_running_on_xen())
return -ENODEV;
register_cpu_notifier(&hotplug_cpu);
register_xenstore_notifier(&xsn_cpu);
return 0;
}
arch_initcall(setup_vcpu_hotplug_event);
int __ref smp_suspend(void)
{
unsigned int cpu;
int err;
for_each_online_cpu(cpu) {
if (cpu == 0)
continue;
err = cpu_down(cpu);
if (err) {
printk(KERN_CRIT "Failed to take all CPUs "
"down: %d.\n", err);
for_each_possible_cpu(cpu)
vcpu_hotplug(cpu);
return err;
}
}
return 0;
}
void smp_resume(void)
{
int cpu;
for_each_possible_cpu(cpu)
vcpu_hotplug(cpu);
}
void __ref smp_resume(void)
{
unsigned int cpu;
for_each_possible_cpu(cpu) {
if (cpu == 0)
continue;
vcpu_hotplug(cpu);
}
}
static void handle_vcpu_hotplug_event(struct xenbus_watch *watch,
const char *path, const char *token)
{
unsigned int cpu;
char *cpustr;
cpustr = strstr(path, "cpu/");
if (cpustr != NULL) {
sscanf(cpustr, "cpu/%u", &cpu);
vcpu_hotplug(cpu);
}
}
static void handle_vcpu_hotplug_event(
struct xenbus_watch *watch, const char **vec, unsigned int len)
{
int cpu;
char *cpustr;
const char *node = vec[XS_WATCH_PATH];
if ((cpustr = strstr(node, "cpu/")) != NULL) {
sscanf(cpustr, "cpu/%d", &cpu);
vcpu_hotplug(cpu);
}
}
