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ui/console: eliminate QOM properties from qemu_console_is_multihead()

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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>
This commit is contained in:
Laszlo Ersek 2023-09-13 16:49:58 +02:00 committed by Marc-André Lureau
parent 4ce2f97c00
commit 2c0c4c1f65
1 changed files with 8 additions and 8 deletions
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16
ui/console.c
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@ -1434,25 +1434,25 @@ bool qemu_console_is_gl_blocked(QemuConsole *con)
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) {
@ -1471,7 +1471,7 @@ char *qemu_console_get_label(QemuConsole *con)
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 :