igvm: move file load to complete callback

Add UserCreatableClass->complete callback function for igvm-cfg object.

Move file loading and parsing of the igvm file from the process function
to the new complete() callback function.  Keep the igvm file loaded
after processing, release it in finalize() instead, so we parse it only
once.

Reviewed-by: Ani Sinha <anisinha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-ID: <20260126123755.357378-4-kraxel@redhat.com>

include/system/igvm-internal.h

@@ -13,6 +13,8 @@
 #include "qom/object.h"
 #include "hw/core/resettable.h"
 
+#include <igvm/igvm.h>
+
 struct IgvmCfg {
     ObjectClass parent_class;
 
@@ -22,7 +24,10 @@ struct IgvmCfg {
      *           format.
      */
     char *filename;
+    IgvmHandle file;
     ResettableState reset_state;
 };
 
+IgvmHandle qigvm_file_init(char *filename, Error **errp);
+
 #endif