ui/vc: do not parse VC-specific options in Spice and GTK

In commit 6f974c8 ("gtk: overwrite the console.c char driver"), I
shared the VC console parse handler with GTK. And later on in commit
d8aec9d ("display: add -display spice-app launching a Spice client"),
I also used it to handle spice-app VC.

This is not necessary, the VC console options (width/height/cols/rows)
are specific, and unused by tty-level GTK/Spice VC.

This is not a breaking change, as those options are still being parsed
by QAPI ChardevVC. Adjust the documentation about it.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20230830093843.3531473-44-marcandre.lureau@redhat.com>

include/chardev/char.h

@@ -320,7 +320,4 @@ GSource *qemu_chr_timeout_add_ms(Chardev *chr, guint ms,
 void suspend_mux_open(void);
 void resume_mux_open(void);
 
-/* console.c */
-void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend, Error **errp);
-
 #endif

qapi/char.json

@@ -390,6 +390,10 @@
 #
 # @rows: console height, in chars
 #
+# Note: the options are only effective when the VNC or SDL graphical
+# display backend is active. They are ignored with the GTK, Spice, VNC
+# and D-Bus display backends.
+#
 # Since: 1.5
 ##
 { 'struct': 'ChardevVC',

ui/console.c

@@ -2708,7 +2708,7 @@ void qemu_display_help(void)
     }
 }
 
-void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend, Error **errp)
+static void vc_chr_parse(QemuOpts *opts, ChardevBackend *backend, Error **errp)
 {
     int val;
     ChardevVC *vc;
@@ -2746,7 +2746,7 @@ static void char_vc_class_init(ObjectClass *oc, void *data)
 {
     ChardevClass *cc = CHARDEV_CLASS(oc);
 
-    cc->parse = qemu_chr_parse_vc;
+    cc->parse = vc_chr_parse;
     cc->open = vc_chr_open;
     cc->chr_write = vc_chr_write;
     cc->chr_accept_input = vc_chr_accept_input;

ui/gtk.c

@@ -1860,7 +1860,6 @@ static void char_gd_vc_class_init(ObjectClass *oc, void *data)
 {
     ChardevClass *cc = CHARDEV_CLASS(oc);
 
-    cc->parse = qemu_chr_parse_vc;
     cc->open = gd_vc_open;
     cc->chr_write = gd_vc_chr_write;
     cc->chr_accept_input = gd_vc_chr_accept_input;

ui/spice-app.c

@@ -96,14 +96,19 @@ static void vc_chr_set_echo(Chardev *chr, bool echo)
     /* TODO: set echo for frontends QMP and qtest */
 }
 
+static void vc_chr_parse(QemuOpts *opts, ChardevBackend *backend, Error **errp)
+{
+    /* fqdn is dealt with in vc_chr_open() */
+}
+
 static void char_vc_class_init(ObjectClass *oc, void *data)
 {
     VCChardevClass *vc = CHARDEV_VC_CLASS(oc);
     ChardevClass *cc = CHARDEV_CLASS(oc);
 
     vc->parent_open = cc->open;
 
-    cc->parse = qemu_chr_parse_vc;
+    cc->parse = vc_chr_parse;
     cc->open = vc_chr_open;
     cc->chr_set_echo = vc_chr_set_echo;
 }