qxl: allow to specify head limit to qxl driver

This patch allow to limit number of heads using qxl driver. By default
qxl driver is not limited on any kind on head use so can decide to use
as much heads.

libvirt has this as a video card parameter (actually set to 1 but not
used). This parameter will allow to limit setting a use can do (which
could be confusing).

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

diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index f87a5ee60244e6aaa31e2c1449928d6dccf74049..4e5ff69af30d0a8162bdbe0363cb13014ba7c25a 100644 (file)
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -271,6 +271,12 @@ static void qxl_spice_monitors_config_async(PCIQXLDevice *qxl, int replay)
                     QXL_COOKIE_TYPE_POST_LOAD_MONITORS_CONFIG,
                     0));
     } else {
+#if SPICE_SERVER_VERSION >= 0x000c06 /* release 0.12.6 */
+        if (qxl->max_outputs) {
+            spice_qxl_set_monitors_config_limit(&qxl->ssd.qxl,
+                                                qxl->max_outputs);
+        }
+#endif
         qxl->guest_monitors_config = qxl->ram->monitors_config;
         spice_qxl_monitors_config_async(&qxl->ssd.qxl,
                 qxl->ram->monitors_config,
@@ -991,6 +997,7 @@ static int interface_client_monitors_config(QXLInstance *sin,
     PCIQXLDevice *qxl = container_of(sin, PCIQXLDevice, ssd.qxl);
     QXLRom *rom = memory_region_get_ram_ptr(&qxl->rom_bar);
     int i;
+    unsigned max_outputs = ARRAY_SIZE(rom->client_monitors_config.heads);
 
     if (qxl->revision < 4) {
         trace_qxl_client_monitors_config_unsupported_by_device(qxl->id,
@@ -1013,17 +1020,23 @@ static int interface_client_monitors_config(QXLInstance *sin,
     if (!monitors_config) {
         return 1;
     }
+
+#if SPICE_SERVER_VERSION >= 0x000c06 /* release 0.12.6 */
+    /* limit number of outputs based on setting limit */
+    if (qxl->max_outputs && qxl->max_outputs <= max_outputs) {
+        max_outputs = qxl->max_outputs;
+    }
+#endif
+
     memset(&rom->client_monitors_config, 0,
            sizeof(rom->client_monitors_config));
     rom->client_monitors_config.count = monitors_config->num_of_monitors;
     /* monitors_config->flags ignored */
-    if (rom->client_monitors_config.count >=
-            ARRAY_SIZE(rom->client_monitors_config.heads)) {
+    if (rom->client_monitors_config.count >= max_outputs) {
         trace_qxl_client_monitors_config_capped(qxl->id,
                                 monitors_config->num_of_monitors,
-                                ARRAY_SIZE(rom->client_monitors_config.heads));
-        rom->client_monitors_config.count =
-            ARRAY_SIZE(rom->client_monitors_config.heads);
+                                max_outputs);
+        rom->client_monitors_config.count = max_outputs;
     }
     for (i = 0 ; i < rom->client_monitors_config.count ; ++i) {
         VDAgentMonConfig *monitor = &monitors_config->monitors[i];
@@ -2274,6 +2287,9 @@ static Property qxl_properties[] = {
         DEFINE_PROP_UINT32("vram64_size_mb", PCIQXLDevice, vram_size_mb, -1),
         DEFINE_PROP_UINT32("vgamem_mb", PCIQXLDevice, vgamem_size_mb, 16),
         DEFINE_PROP_INT32("surfaces", PCIQXLDevice, ssd.num_surfaces, 1024),
+#if SPICE_SERVER_VERSION >= 0x000c06 /* release 0.12.6 */
+        DEFINE_PROP_UINT16("max_outputs", PCIQXLDevice, max_outputs, 0),
+#endif
         DEFINE_PROP_END_OF_LIST(),
 };
 

diff --git a/hw/display/qxl.h b/hw/display/qxl.h
index deddd54d2f25e3926c545053c7ba08d100e7e171..2ddf065e1f576ead269968338dff201c97436b88 100644 (file)
--- a/hw/display/qxl.h
+++ b/hw/display/qxl.h
@@ -99,6 +99,9 @@ typedef struct PCIQXLDevice {
     QXLModes           *modes;
     uint32_t           rom_size;
     MemoryRegion       rom_bar;
+#if SPICE_SERVER_VERSION >= 0x000c06 /* release 0.12.6 */
+    uint16_t           max_outputs;
+#endif
 
     /* vram pci bar */
     uint32_t           vram_size;