xen: Initialize event channels and io rings

Open and bind event channels; map ioreq and buffered ioreq rings.

Signed-off-by: Arun Sharma <arun.sharma@intel.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/hw/xen_common.h b/hw/xen_common.h
index dd3e896..a1958a0 100644
--- a/hw/xen_common.h
+++ b/hw/xen_common.h
@@ -107,4 +107,6 @@
 }
 #endif
 
+void destroy_hvm_domain(void);
+
 #endif /* QEMU_HW_XEN_COMMON_H */