Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[deliverable/linux.git] / virt / kvm / kvm_main.c

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index ce3d8e5be73e38f54d4b2fab2bdb9874abaccf0d..2e791367c576c9b2fb7dc6ee30f49f61356d3a05 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3155,12 +3155,13 @@ static void hardware_enable_nolock(void *junk)
        }
 }
 
-static void hardware_enable(void)
+static int kvm_starting_cpu(unsigned int cpu)
 {
        raw_spin_lock(&kvm_count_lock);
        if (kvm_usage_count)
                hardware_enable_nolock(NULL);
        raw_spin_unlock(&kvm_count_lock);
+       return 0;
 }
 
 static void hardware_disable_nolock(void *junk)
@@ -3173,12 +3174,13 @@ static void hardware_disable_nolock(void *junk)
        kvm_arch_hardware_disable();
 }
 
-static void hardware_disable(void)
+static int kvm_dying_cpu(unsigned int cpu)
 {
        raw_spin_lock(&kvm_count_lock);
        if (kvm_usage_count)
                hardware_disable_nolock(NULL);
        raw_spin_unlock(&kvm_count_lock);
+       return 0;
 }
 
 static void hardware_disable_all_nolock(void)
@@ -3219,21 +3221,6 @@ static int hardware_enable_all(void)
        return r;
 }
 
-static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
-                          void *v)
-{
-       val &= ~CPU_TASKS_FROZEN;
-       switch (val) {
-       case CPU_DYING:
-               hardware_disable();
-               break;
-       case CPU_STARTING:
-               hardware_enable();
-               break;
-       }
-       return NOTIFY_OK;
-}
-
 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
                      void *v)
 {
@@ -3500,10 +3487,6 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
        return r;
 }
 
-static struct notifier_block kvm_cpu_notifier = {
-       .notifier_call = kvm_cpu_hotplug,
-};
-
 static int kvm_debugfs_open(struct inode *inode, struct file *file,
                           int (*get)(void *, u64 *), int (*set)(void *, u64),
                           const char *fmt)
@@ -3754,7 +3737,8 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
                        goto out_free_1;
        }
 
-       r = register_cpu_notifier(&kvm_cpu_notifier);
+       r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "AP_KVM_STARTING",
+                                     kvm_starting_cpu, kvm_dying_cpu);
        if (r)
                goto out_free_2;
        register_reboot_notifier(&kvm_reboot_notifier);
@@ -3808,7 +3792,7 @@ out_free:
        kmem_cache_destroy(kvm_vcpu_cache);
 out_free_3:
        unregister_reboot_notifier(&kvm_reboot_notifier);
-       unregister_cpu_notifier(&kvm_cpu_notifier);
+       cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
 out_free_2:
 out_free_1:
        kvm_arch_hardware_unsetup();
@@ -3831,7 +3815,7 @@ void kvm_exit(void)
        kvm_async_pf_deinit();
        unregister_syscore_ops(&kvm_syscore_ops);
        unregister_reboot_notifier(&kvm_reboot_notifier);
-       unregister_cpu_notifier(&kvm_cpu_notifier);
+       cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING);
        on_each_cpu(hardware_disable_nolock, NULL, 1);
        kvm_arch_hardware_unsetup();
        kvm_arch_exit();