[PATCH] KVM: Recover after an arch module load failure

If we load the wrong arch module, it leaves behind kvm_arch_ops set, which
prevents loading of the correct arch module later.

Fix be not setting kvm_arch_ops until we're sure it's good.

Signed-off-by: Yoshimi Ichiyanagi <ichiyanagi.yoshimi@lab.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index ce7fe64..b54caf0 100644 (file)
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1944,17 +1944,17 @@ int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
                return -EEXIST;
        }
 
-       kvm_arch_ops = ops;
-
-       if (!kvm_arch_ops->cpu_has_kvm_support()) {
+       if (!ops->cpu_has_kvm_support()) {
                printk(KERN_ERR "kvm: no hardware support\n");
                return -EOPNOTSUPP;
        }
-       if (kvm_arch_ops->disabled_by_bios()) {
+       if (ops->disabled_by_bios()) {
                printk(KERN_ERR "kvm: disabled by bios\n");
                return -EOPNOTSUPP;
        }
 
+       kvm_arch_ops = ops;
+
        r = kvm_arch_ops->hardware_setup();
        if (r < 0)
            return r;