server: add QXLInterface::client_monitors_config

Used to implement guest monitor configuration change similarly to real
hardware in conjunction with the new qemu interrupt
QXL_INTERRUPT_CLIENT_MONITORS_CONFIG. client_monitors_config is also
used to probe the support by the interface. If it is not supported we
send the message to the guest agent.
This makes a linux qxl driver similar to existing kms drivers.

The logic is:

For every received VDAgentMonitorsConfig:
 if client_monitors_config(NULL):
  write client configuration to pci rom BAR.
  send interrupt to guest
  guest kernel reads configuration from rom BAR.
  guest kernel issues event to user space
  user space reads (libdrm) and reconfigures (libXRandr)
 else: (current implementation)
  write message to guest agent
  guest agent issues reconfiguration via XRandr / windows Escape ioctl to kernel

1 files changed, 9 insertions, 3 deletions

diff --git a/server/spice.h b/server/spice.h
index 2b2ed36a..2b949062 100644
--- a/server/spice.h
+++ b/server/spice.h
@@ -21,6 +21,7 @@
 #include <stdint.h>
 #include <sys/socket.h>
 #include <spice/qxl_dev.h>
+#include <spice/vd_agent.h>
 
 #define SPICE_SERVER_VERSION 0x000b04 /* release 0.11.4 */
 
@@ -96,7 +97,7 @@ struct SpiceCoreInterface {
 
 #define SPICE_INTERFACE_QXL "qxl"
 #define SPICE_INTERFACE_QXL_MAJOR 3
-#define SPICE_INTERFACE_QXL_MINOR 2
+#define SPICE_INTERFACE_QXL_MINOR 3
 typedef struct QXLInterface QXLInterface;
 typedef struct QXLInstance QXLInstance;
 typedef struct QXLState QXLState;
@@ -240,8 +241,13 @@ struct QXLInterface {
                                  struct QXLRect *updated_rects,
                                  uint32_t num_updated_rects);
     void (*set_client_capabilities)(QXLInstance *qin,
-				    uint8_t client_present,
-				    uint8_t caps[58]);
+                                    uint8_t client_present,
+                                    uint8_t caps[58]);
+    /* returns 1 if the interface is supported, 0 otherwise.
+     * if monitors_config is NULL nothing is done except reporting the
+     * return code. */
+    int (*client_monitors_config)(QXLInstance *qin,
+                                  VDAgentMonitorsConfig *monitors_config);
 };
 
 struct QXLInstance {