1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 38375e2bb703..06314071c6d2 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1865,6 +1865,11 @@ int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
 {
         int r;
 
+        if (kvm_arch_ops) {
+                printk(KERN_ERR "kvm: already loaded the other module\n");
+                return -EEXIST;
+        }
+
         kvm_arch_ops = ops;
 
         if (!kvm_arch_ops->cpu_has_kvm_support()) {
@@ -1907,6 +1912,7 @@ void kvm_exit_arch(void)
         unregister_reboot_notifier(&kvm_reboot_notifier);
         on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
         kvm_arch_ops->hardware_unsetup();
+        kvm_arch_ops = NULL;
 }
 
 static __init int kvm_init(void)