1 files changed, 15 insertions, 3 deletions

diff --git a/src/virgl_resource.h b/src/virgl_resource.h
index 15efa8fa..42983cdc 100644
--- a/src/virgl_resource.h
+++ b/src/virgl_resource.h
@@ -44,6 +44,16 @@ enum virgl_resource_fd_type {
  * and imported into a vrend_decode_ctx to create a vrend_resource.
  *
  * It is also possible to create a virgl_resource from a context object.
+ *
+ * The underlying storage of a virgl_resource is provided by a pipe_resource
+ * and/or a fd.  When it is provided by a pipe_resource, the virgl_resource is
+ * said to be typed because pipe_resource also provides the type information.
+ *
+ * Conventional resources are always typed.  Blob resources by definition do
+ * not have nor need type information, but those created from vrend_decode_ctx
+ * objects are typed.  That should be considered a convenience rather than
+ * something to be relied upon.  Contexts must not assume that every resource is
+ * typed when interop is expected.
  */
 struct virgl_resource {
    uint32_t res_id;
@@ -56,6 +66,8 @@ struct virgl_resource {
    const struct iovec *iov;
    int iov_count;
 
+   uint32_t map_info;
+
    void *private_data;
 };
 
@@ -84,20 +96,20 @@ virgl_resource_table_cleanup(void);
 void
 virgl_resource_table_reset(void);
 
-int
+struct virgl_resource *
 virgl_resource_create_from_pipe(uint32_t res_id,
                                 struct pipe_resource *pres,
                                 const struct iovec *iov,
                                 int iov_count);
 
-int
+struct virgl_resource *
 virgl_resource_create_from_fd(uint32_t res_id,
                               enum virgl_resource_fd_type fd_type,
                               int fd,
                               const struct iovec *iov,
                               int iov_count);
 
-int
+struct virgl_resource *
 virgl_resource_create_from_iov(uint32_t res_id,
                                const struct iovec *iov,
                                int iov_count);