diff --git a/drivers/kvm/vmx.h b/drivers/kvm/vmx.h
index 35d0b58..fd4e146 100644
--- a/drivers/kvm/vmx.h
+++ b/drivers/kvm/vmx.h
@@ -213,6 +213,7 @@
 #define EXIT_REASON_MSR_READ            31
 #define EXIT_REASON_MSR_WRITE           32
 #define EXIT_REASON_MWAIT_INSTRUCTION   36
+#define EXIT_REASON_TPR_BELOW_THRESHOLD 43
 
 /*
  * Interruption-information format