virtio-gpu: handle VIRTIO_GPU_CMD_ALLOCATION_METADATA

Designed to return metadata to the guest.

BUG=chromium:924405
TEST=compile

Change-Id: Ic04a0bbb6b0a5bb6d08314371181f256eb7230df
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1591464
Reviewed-by: Zach Reizner <zachr@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Commit-Queue: Gurchetan Singh <gurchetansingh@chromium.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/gpu_renderer/src/lib.rs b/gpu_renderer/src/lib.rs
index c8f6f84..42df26a 100644
--- a/gpu_renderer/src/lib.rs
+++ b/gpu_renderer/src/lib.rs
@@ -392,6 +392,24 @@ impl Renderer {
     pub fn force_ctx_0(&self) {
         unsafe { virgl_renderer_force_ctx_0() };
     }
+
+    #[allow(unused_variables)]
+    pub fn allocation_metadata(&self, request: &[u8], response: &mut Vec<u8>) -> Result<()> {
+        #[cfg(feature = "virtio-gpu-next")]
+        {
+            let ret = unsafe {
+                virgl_renderer_allocation_metadata(
+                    request.as_ptr() as *const c_void,
+                    response.as_mut_ptr() as *mut c_void,
+                    request.len() as u32,
+                    response.len() as u32,
+                )
+            };
+            ret_to_res(ret)
+        }
+        #[cfg(not(feature = "virtio-gpu-next"))]
+        Err(Error::Unsupported)
+    }
 }
 
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