spice: fix display initialization

Spice has two display interface implementations:  One integrated into
the qxl graphics card, and one generic which can operate with every
qemu-emulated graphics card.

The generic one is activated in case spice is used without qxl.  The
logic for that only caught the "-vga qxl" case, "-device qxl-vga" goes
unnoticed.  Fix that by adding a check in the spice interface
registration so we'll notice the qxl card no matter how it is created.

https://bugzilla.redhat.com/show_bug.cgi?id=981094

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

include/sysemu/sysemu.h

diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 3caeb66..d7a77b6 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -103,7 +103,6 @@
 
 extern int vga_interface_type;
 #define xenfb_enabled (vga_interface_type == VGA_XENFB)
-#define qxl_enabled (vga_interface_type == VGA_QXL)
 
 extern int graphic_width;
 extern int graphic_height;

include/ui/qemu-spice.h

diff --git a/include/ui/qemu-spice.h b/include/ui/qemu-spice.h
index eba6d77..c6c756b 100644
--- a/include/ui/qemu-spice.h
+++ b/include/ui/qemu-spice.h
@@ -27,6 +27,7 @@
 #include "monitor/monitor.h"
 
 extern int using_spice;
+extern int spice_displays;
 
 void qemu_spice_init(void);
 void qemu_spice_input_init(void);
@@ -57,6 +58,7 @@
 #include "monitor/monitor.h"
 
 #define using_spice 0
+#define spice_displays 0
 static inline int qemu_spice_set_passwd(const char *passwd,
                                         bool fail_if_connected,
                                         bool disconnect_if_connected)

ui/spice-core.c

diff --git a/ui/spice-core.c b/ui/spice-core.c
index 033fd89..bd7a248 100644
--- a/ui/spice-core.c
+++ b/ui/spice-core.c
@@ -48,6 +48,7 @@
 static time_t auth_expires = TIME_MAX;
 static int spice_migration_completed;
 int using_spice = 0;
+int spice_displays;
 
 static QemuThread me;
 
@@ -836,6 +837,10 @@
         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);
 }
 

vl.c

diff --git a/vl.c b/vl.c
index 25b8f2f..f422a1c 100644
--- a/vl.c
+++ b/vl.c
@@ -4387,7 +4387,7 @@
     }
 #endif
 #ifdef CONFIG_SPICE
-    if (using_spice && !qxl_enabled) {
+    if (using_spice && !spice_displays) {
         qemu_spice_display_init(ds);
     }
 #endif