vl.c: Output error on invalid machine type

Output error message using qemu's error_report() function when user
provides the invalid machine type on the command line. This also saves
time to find what issue is when you downgrade from one version of qemu
to another that doesn't support required machine type yet (the version
user downgraded to have to have this patch applied too, of course).

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
[Replace printf with error_printf, suggested by Markus Armbruster. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 13 insertions, 8 deletions

diff --git a/vl.c b/vl.c
index 842e897d75..b363a21779 100644
--- a/vl.c
+++ b/vl.c
@@ -2651,15 +2651,20 @@ static MachineClass *machine_parse(const char *name)
     if (mc) {
         return mc;
     }
-    printf("Supported machines are:\n");
-    for (el = machines; el; el = el->next) {
-        MachineClass *mc = el->data;
-        QEMUMachine *m = mc->qemu_machine;
-        if (m->alias) {
-            printf("%-20s %s (alias of %s)\n", m->alias, m->desc, m->name);
+    if (name && !is_help_option(name)) {
+        error_report("Unsupported machine type");
+        error_printf("Use -machine help to list supported machines!\n");
+    } else {
+        printf("Supported machines are:\n");
+        for (el = machines; el; el = el->next) {
+            MachineClass *mc = el->data;
+            QEMUMachine *m = mc->qemu_machine;
+            if (m->alias) {
+                printf("%-20s %s (alias of %s)\n", m->alias, m->desc, m->name);
+            }
+            printf("%-20s %s%s\n", m->name, m->desc,
+                   m->is_default ? " (default)" : "");
         }
-        printf("%-20s %s%s\n", m->name, m->desc,
-               m->is_default ? " (default)" : "");
     }
 
     g_slist_free(machines);