According to Marc-André's and Gerd's descriptions, the "device" and
"head" members of QemuGraphicConsole are exposed as QOM properties for two
purposes:
(1) Introspection (e.g., "qom-get" monitor command).
(2) A VNC server can display a specific device + head. This lets us run a
multihead configuration by using multiple VNC servers (one for each
head).
Further, we can link input devices to device + head, so input events
are routed to different devices dependent on where they are coming
from. Which is most useful for tablet devices in a VNC multihead
setup, each head has its own tablet device then. This does requires
manual guest-side configuration, for establishing the same tablet <->
head relationship.
However, neither goal seems to justify the complicated QOM property lookup
that's internal to qemu_console_is_multihead().
Rework qemu_console_is_multihead() with plain old C language field
accesses.
Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com> (odd fixer:Graphics)
Cc: Gerd Hoffmann <kraxel@redhat.com> (odd fixer:Graphics)
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <
20230913144959.41891-4-lersek@redhat.com>
return con->gl_block;
}
-static bool qemu_console_is_multihead(DeviceState *dev)
+static bool qemu_graphic_console_is_multihead(QemuGraphicConsole *c)
{
QemuConsole *con;
- Object *obj;
uint32_t f = 0xffffffff;
uint32_t h;
QTAILQ_FOREACH(con, &consoles, next) {
+ QemuGraphicConsole *candidate;
+
if (!QEMU_IS_GRAPHIC_CONSOLE(con)) {
continue;
}
- obj = object_property_get_link(OBJECT(con),
- "device", &error_abort);
- if (DEVICE(obj) != dev) {
+
+ candidate = QEMU_GRAPHIC_CONSOLE(con);
+ if (candidate->device != c->device) {
continue;
}
- h = object_property_get_uint(OBJECT(con),
- "head", &error_abort);
+ h = candidate->head;
if (f == 0xffffffff) {
f = h;
} else if (h != f) {
bool multihead;
dev = DEVICE(c->device);
- multihead = qemu_console_is_multihead(dev);
+ multihead = qemu_graphic_console_is_multihead(c);
if (multihead) {
return g_strdup_printf("%s.%d", dev->id ?
dev->id :