diff --git a/src/virgl_context.h b/src/virgl_context.h
index f009504..ea86b31 100644
--- a/src/virgl_context.h
+++ b/src/virgl_context.h
@@ -48,6 +48,12 @@ struct virgl_context_blob {
    void *renderer_data;
 };
 
+struct virgl_context;
+
+typedef void (*virgl_context_fence_retire)(struct virgl_context *ctx,
+                                           uint64_t queue_id,
+                                           void *fence_cookie);
+
 /**
  * Base class for renderer contexts.  For example, vrend_decode_ctx is a
  * subclass of virgl_context.
@@ -57,6 +63,16 @@ struct virgl_context {
 
    enum virgl_renderer_capset capset_id;
 
+   /*
+    * Each fence goes through submitted, signaled, and retired.  This callback
+    * is called from virgl_context::retire_fences to retire signaled fences of
+    * each queue.  When a queue has multiple signaled fences by the time
+    * virgl_context::retire_fences is called, this callback might not be called
+    * on all fences but only on the latest one, depending on the flags of the
+    * fences.
+    */
+   virgl_context_fence_retire fence_retire;
+
    void (*destroy)(struct virgl_context *ctx);
 
    void (*attach_resource)(struct virgl_context *ctx,
@@ -89,6 +105,21 @@ struct virgl_context {
    int (*submit_cmd)(struct virgl_context *ctx,
                      const void *buffer,
                      size_t size);
+
+   /*
+    * Return an fd that is readable whenever there is any signaled fence in
+    * any queue, or -1 if not supported.
+    */
+   int (*get_fencing_fd)(struct virgl_context *ctx);
+
+   /* retire signaled fences of all queues */
+   void (*retire_fences)(struct virgl_context *ctx);
+
+   /* submit a fence to the queue identified by queue_id */
+   int (*submit_fence)(struct virgl_context *ctx,
+                       uint32_t flags,
+                       uint64_t queue_id,
+                       void *fence_cookie);
 };
 
 struct virgl_context_foreach_args {
diff --git a/src/virglrenderer.c b/src/virglrenderer.c
index e496bef..4462918 100644
--- a/src/virglrenderer.c
+++ b/src/virglrenderer.c
@@ -204,6 +204,7 @@ int virgl_renderer_context_create_with_flags(uint32_t ctx_id,
 
    ctx->ctx_id = ctx_id;
    ctx->capset_id = capset_id;
+   ctx->fence_retire = NULL;
 
    ret = virgl_context_add(ctx);
    if (ret) {
diff --git a/src/vrend_decode.c b/src/vrend_decode.c
index 61cb01a..557ad02 100644
--- a/src/vrend_decode.c
+++ b/src/vrend_decode.c
@@ -1683,4 +1683,8 @@ static void vrend_decode_ctx_init_base(struct vrend_decode_ctx *dctx,
    ctx->get_blob = vrend_decode_ctx_get_blob;
    ctx->get_blob_done = NULL;
    ctx->submit_cmd = vrend_decode_ctx_submit_cmd;
+
+   ctx->get_fencing_fd = NULL;
+   ctx->retire_fences = NULL;
+   ctx->submit_fence = NULL;
 }