From d7ecf712382486ef0d79fe335f5abb333b44d279 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@redhat.com>
Date: Thu, 11 Oct 2018 19:12:54 +0200
Subject: [PATCH] vl: Print error when using incorrect backend for debugcon
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When using an incorrect backend for the debugcon, QEMU exits silently
without any error indication, which is confusing.
Add a message that the character backend is invalid.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20181011171254.32428-1-philmd@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 vl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/vl.c b/vl.c
index 4e25c78bff..61305b5891 100644
--- a/vl.c
+++ b/vl.c
@@ -2466,6 +2466,7 @@ static int debugcon_parse(const char *devname)
     QemuOpts *opts;
 
     if (!qemu_chr_new_mux_mon("debugcon", devname)) {
+        error_report("invalid character backend '%s'", devname);
         exit(1);
     }
     opts = qemu_opts_create(qemu_find_opts("device"), "debugcon", 1, NULL);
-- 
2.39.5