KVM: protect kvm_usage_count with its own spinlock

[karo-tx-linux.git] / virt / kvm / kvm_main.c

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 426051d66173ce0dcdba1ba8fd3f29eef017d0ad..eb94343c2ed2153b773e3fda3d519cc8f468d56b 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -71,6 +71,7 @@ MODULE_LICENSE("GPL");
  */
 
 DEFINE_RAW_SPINLOCK(kvm_lock);
+static DEFINE_RAW_SPINLOCK(kvm_count_lock);
 LIST_HEAD(vm_list);
 
 static cpumask_var_t cpus_hardware_enabled;
@@ -2683,10 +2684,10 @@ static void hardware_enable_nolock(void *junk)
 
 static void hardware_enable(void)
 {
-       raw_spin_lock(&kvm_lock);
+       raw_spin_lock(&kvm_count_lock);
        if (kvm_usage_count)
                hardware_enable_nolock(NULL);
-       raw_spin_unlock(&kvm_lock);
+       raw_spin_unlock(&kvm_count_lock);
 }
 
 static void hardware_disable_nolock(void *junk)
@@ -2701,10 +2702,10 @@ static void hardware_disable_nolock(void *junk)
 
 static void hardware_disable(void)
 {
-       raw_spin_lock(&kvm_lock);
+       raw_spin_lock(&kvm_count_lock);
        if (kvm_usage_count)
                hardware_disable_nolock(NULL);
-       raw_spin_unlock(&kvm_lock);
+       raw_spin_unlock(&kvm_count_lock);
 }
 
 static void hardware_disable_all_nolock(void)
@@ -2718,16 +2719,16 @@ static void hardware_disable_all_nolock(void)
 
 static void hardware_disable_all(void)
 {
-       raw_spin_lock(&kvm_lock);
+       raw_spin_lock(&kvm_count_lock);
        hardware_disable_all_nolock();
-       raw_spin_unlock(&kvm_lock);
+       raw_spin_unlock(&kvm_count_lock);
 }
 
 static int hardware_enable_all(void)
 {
        int r = 0;
 
-       raw_spin_lock(&kvm_lock);
+       raw_spin_lock(&kvm_count_lock);
 
        kvm_usage_count++;
        if (kvm_usage_count == 1) {
@@ -2740,7 +2741,7 @@ static int hardware_enable_all(void)
                }
        }
 
-       raw_spin_unlock(&kvm_lock);
+       raw_spin_unlock(&kvm_count_lock);
 
        return r;
 }
@@ -3130,7 +3131,7 @@ static int kvm_suspend(void)
 static void kvm_resume(void)
 {
        if (kvm_usage_count) {
-               WARN_ON(raw_spin_is_locked(&kvm_lock));
+               WARN_ON(raw_spin_is_locked(&kvm_count_lock));
                hardware_enable_nolock(NULL);
        }
 }