diff --git a/target-i386/hyperv.c b/target-i386/hyperv.c
index 6b519c392e925fa500bc6caed329bd30ffe9b694..c4d6a9b2b16199503520a33558558e9507cd0197 100644
--- a/target-i386/hyperv.c
+++ b/target-i386/hyperv.c
@@ -44,6 +44,18 @@ int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
             return -1;
         }
         return 0;
+    case KVM_EXIT_HYPERV_HCALL: {
+        uint16_t code;
+
+        code  = exit->u.hcall.input & 0xffff;
+        switch (code) {
+        case HVCALL_POST_MESSAGE:
+        case HVCALL_SIGNAL_EVENT:
+        default:
+            exit->u.hcall.result = HV_STATUS_INVALID_HYPERCALL_CODE;
+            return 0;
+        }
+    }
     default:
         return -1;
     }