spice: fix multihead support

This patch fixes spice display initialization to handle
multihead properly.

spice-core now keeps track of which QemuConsole has a spice
display channel attached to it and which has not.  It also
manages display channel ids.

spice-display looks at all QemuConsoles and will pick up any
graphic console not yet bound to a spice channel (which in practice
are all non-qxl graphic devices).

Result is that
 (a) you'll get a spice client window for each graphical device
     now (first only without this patch), and
 (b) mixing qxl and non-qxl vga cards works properly.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/display/qxl.c

@@ -2037,8 +2037,7 @@ static int qxl_init_common(PCIQXLDevice *qxl)
            qxl->vram32_size < qxl->vram_size ? "[region 4]" : "[unmapped]");
 
     qxl->ssd.qxl.base.sif = &qxl_interface.base;
-    qxl->ssd.qxl.id = qxl->id;
-    if (qemu_spice_add_interface(&qxl->ssd.qxl.base) != 0) {
+    if (qemu_spice_add_display_interface(&qxl->ssd.qxl, qxl->vga.con) != 0) {
         error_report("qxl interface %d.%d not supported by spice-server",
                      SPICE_INTERFACE_QXL_MAJOR, SPICE_INTERFACE_QXL_MINOR);
         return -1;

include/ui/qemu-spice.h

@@ -27,14 +27,15 @@
 #include "monitor/monitor.h"
 
 extern int using_spice;
-extern int spice_displays;
 
 void qemu_spice_init(void);
 void qemu_spice_input_init(void);
 void qemu_spice_audio_init(void);
-void qemu_spice_display_init(DisplayState *ds);
+void qemu_spice_display_init(void);
 int qemu_spice_display_add_client(int csock, int skipauth, int tls);
 int qemu_spice_add_interface(SpiceBaseInstance *sin);
+bool qemu_spice_have_display_interface(QemuConsole *con);
+int qemu_spice_add_display_interface(QXLInstance *qxlin, QemuConsole *con);
 int qemu_spice_set_passwd(const char *passwd,
                           bool fail_if_connected, bool disconnect_if_connected);
 int qemu_spice_set_pw_expire(time_t expires);

ui/spice-core.c

@@ -48,7 +48,6 @@ static char *auth_passwd;
 static time_t auth_expires = TIME_MAX;
 static int spice_migration_completed;
 int using_spice = 0;
-int spice_displays;
 
 static QemuThread me;
 
@@ -837,11 +836,28 @@ int qemu_spice_add_interface(SpiceBaseInstance *sin)
         qemu_add_vm_change_state_handler(vm_change_state_handler, NULL);
     }
 
-    if (strcmp(sin->sif->type, SPICE_INTERFACE_QXL) == 0) {
-        spice_displays++;
+    return spice_server_add_interface(spice_server, sin);
+}
+
+static GSList *spice_consoles;
+static int display_id;
+
+bool qemu_spice_have_display_interface(QemuConsole *con)
+{
+    if (g_slist_find(spice_consoles, con)) {
+        return true;
     }
+    return false;
+}
 
-    return spice_server_add_interface(spice_server, sin);
+int qemu_spice_add_display_interface(QXLInstance *qxlin, QemuConsole *con)
+{
+    if (g_slist_find(spice_consoles, con)) {
+        return -1;
+    }
+    qxlin->id = display_id++;
+    spice_consoles = g_slist_append(spice_consoles, con);
+    return qemu_spice_add_interface(&qxlin->base);
 }
 
 static int qemu_spice_set_ticket(bool fail_if_conn, bool disconnect_if_conn)

ui/spice-display.c

@@ -612,21 +612,38 @@ static const DisplayChangeListenerOps display_listener_ops = {
     .dpy_refresh     = display_refresh,
 };
 
-void qemu_spice_display_init(DisplayState *ds)
+static void qemu_spice_display_init_one(QemuConsole *con)
 {
     SimpleSpiceDisplay *ssd = g_new0(SimpleSpiceDisplay, 1);
 
     qemu_spice_display_init_common(ssd);
 
     ssd->qxl.base.sif = &dpy_interface.base;
-    qemu_spice_add_interface(&ssd->qxl.base);
+    qemu_spice_add_display_interface(&ssd->qxl, con);
     assert(ssd->worker);
 
     qemu_spice_create_host_memslot(ssd);
 
     ssd->dcl.ops = &display_listener_ops;
-    ssd->dcl.con = qemu_console_lookup_by_index(0);
+    ssd->dcl.con = con;
     register_displaychangelistener(&ssd->dcl);
 
     qemu_spice_create_host_primary(ssd);
 }
+
+void qemu_spice_display_init(void)
+{
+    QemuConsole *con;
+    int i;
+
+    for (i = 0;; i++) {
+        con = qemu_console_lookup_by_index(i);
+        if (!con || !qemu_console_is_graphic(con)) {
+            break;
+        }
+        if (qemu_spice_have_display_interface(con)) {
+            continue;
+        }
+        qemu_spice_display_init_one(con);
+    }
+}

vl.c

@@ -4315,8 +4315,8 @@ int main(int argc, char **argv, char **envp)
     }
 #endif
 #ifdef CONFIG_SPICE
-    if (using_spice && !spice_displays) {
-        qemu_spice_display_init(ds);
+    if (using_spice) {
+        qemu_spice_display_init();
     }
 #endif