KVM: Add method to check for backwards-compatible API extensions

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 5d24203afd20..39cf8fd343a3 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -2416,6 +2416,12 @@ static long kvm_dev_ioctl(struct file *filp,
                 r = 0;
                 break;
         }
+        case KVM_CHECK_EXTENSION:
+                /*
+                 * No extensions defined at present.
+                 */
+                r = 0;
+                break;
         default:
                 ;
         }