xen: use libxendevicemodel when available

This patch modifies the wrapper functions in xen_common.h to use the
new xendevicemodel interface if it is available along with compatibility
code to use the old libxenctrl interface if it is not.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Anthony Perard <anthony.perard@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/xen-common.c b/xen-common.c
index 703e7a5861..ae76150e8a 100644
--- a/xen-common.c
+++ b/xen-common.c
@@ -27,6 +27,7 @@
 
 xc_interface *xen_xc;
 xenforeignmemory_handle *xen_fmem;
+xendevicemodel_handle *xen_dmod;
 
 static int store_dev_info(int domid, Chardev *cs, const char *string)
 {
@@ -128,6 +129,13 @@ static int xen_init(MachineState *ms)
         xc_interface_close(xen_xc);
         return -1;
     }
+    xen_dmod = xendevicemodel_open(0, 0);
+    if (xen_dmod == NULL) {
+        xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
+        xenforeignmemory_close(xen_fmem);
+        xc_interface_close(xen_xc);
+        return -1;
+    }
     qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
 
     global_state_set_optional();