KVM: take kvm_lock for hardware_disable() during cpu hotplug

In kvm_cpu_hotplug(), only CPU_STARTING case is protected by kvm_lock. This patch adds missing protection for CPU_DYING case. Signed-off-by: Takuya Yoshikawa <[email protected]> Signed-off-by: Marcelo Tosatti <[email protected]>
akeromi · Jan 12, 2011 · 97e91e2 · 97e91e2
1 parent e730b63
commit 97e91e2
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
@@ -2140,7 +2140,9 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
 	case CPU_DYING:
 		printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
 		       cpu);
+		spin_lock(&kvm_lock);
 		hardware_disable(NULL);
+		spin_unlock(&kvm_lock);
 		break;
 	case CPU_STARTING:
 		printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",