Added time check for SVM

[palacios.git] / palacios / src / palacios / svm.c

diff --git a/palacios/src/palacios/svm.c b/palacios/src/palacios/svm.c
index 6de0781..c11b484 100644 (file)
--- a/palacios/src/palacios/svm.c
+++ b/palacios/src/palacios/svm.c
@@ -468,6 +468,10 @@ int v3_svm_enter(struct guest_info * info) {
 
 
     rdtscll(tmp_tsc);
+    if (tmp_tsc < info->time_state.cached_host_tsc) { 
+       PrintError("Time has gone backwards, panicing!\n");
+       return -1;
+    }
     v3_update_time(info, tmp_tsc - info->time_state.cached_host_tsc);
     rdtscll(info->time_state.cached_host_tsc);
     //    guest_ctrl->TSC_OFFSET = info->time_state.guest_tsc - info->time_state.cached_host_tsc;