HOTPLUG: Add CPU_DYING notifier

KVM wants a notification when a cpu is about to die, so it can disable
hardware extensions, but at a time when user processes cannot be scheduled
on the cpu, so it doesn't try to use virtualization extensions after they
have been disabled.

This adds a CPU_DYING notification.  The notification is called in atomic
context on the doomed cpu.

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 208cf3497c10..181ae7086029 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -103,11 +103,19 @@ static inline void check_for_tasks(int cpu)
         write_unlock_irq(&tasklist_lock);
 }
 
+struct take_cpu_down_param {
+        unsigned long mod;
+        void *hcpu;
+};
+
 /* Take this CPU down. */
-static int take_cpu_down(void *unused)
+static int take_cpu_down(void *_param)
 {
+        struct take_cpu_down_param *param = _param;
         int err;
 
+        raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod,
+                                param->hcpu);
         /* Ensure this CPU doesn't handle any more interrupts. */
         err = __cpu_disable();
         if (err < 0)
@@ -127,6 +135,10 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
         cpumask_t old_allowed, tmp;
         void *hcpu = (void *)(long)cpu;
         unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
+        struct take_cpu_down_param tcd_param = {
+                .mod = mod,
+                .hcpu = hcpu,
+        };
 
         if (num_online_cpus() == 1)
                 return -EBUSY;
@@ -153,7 +165,7 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
         set_cpus_allowed(current, tmp);
 
         mutex_lock(&cpu_bitmask_lock);
-        p = __stop_machine_run(take_cpu_down, NULL, cpu);
+        p = __stop_machine_run(take_cpu_down, &tcd_param, cpu);
         mutex_unlock(&cpu_bitmask_lock);
 
         if (IS_ERR(p) || cpu_online(cpu)) {