Re: [PATCH v4 63/75] x86/sev-es: Handle #DB Events

@@ -1028,6 +1036,16 @@ DEFINE_IDTENTRY_VC_SAFE_STACK(exc_vmm_communication)
 	struct ghcb *ghcb;
 
 	lockdep_assert_irqs_disabled();
+
+	/*
+	 * #DB is special and needs to be handled outside of the intrumentation_begin()/end().
+	 * Otherwise the #VC handler could be raised recursivly.
+	 */
+	if (error_code == SVM_EXIT_EXCP_BASE + X86_TRAP_DB) {
+		vc_handle_trap_db(regs);
+		return;
+	}
+
 	instrumentation_begin();