virtio-gpu: add support for exporting virtgpu resources

BUG=b:136269340
TEST=boot ARCVM and launch play store

Change-Id: I2d78ffb15dcf2dc0f245916485f5ebb636ef6e78
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/2014680
Reviewed-by: David Stevens <stevensd@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Tested-by: David Stevens <stevensd@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Keiichi Watanabe <keiichiw@chromium.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/devices/src/virtio/gpu/virtio_3d_backend.rs b/devices/src/virtio/gpu/virtio_3d_backend.rs
index 3ede8a6..692bedc 100644
--- a/devices/src/virtio/gpu/virtio_3d_backend.rs
+++ b/devices/src/virtio/gpu/virtio_3d_backend.rs
@@ -497,6 +497,23 @@ impl Backend for Virtio3DBackend {
         self.base.move_cursor(x, y)
     }
 
+    /// Returns a uuid for the resource.
+    fn resource_assign_uuid(&mut self, id: u32) -> GpuResponse {
+        match self.resources.entry(id) {
+            Entry::Vacant(_) => GpuResponse::ErrInvalidResourceId,
+            Entry::Occupied(_) => {
+                // TODO(stevensd): use real uuids once the virtio wayland protocol is updated to
+                // handle more than 32 bits. For now, the virtwl driver knows that the uuid is
+                // actually just the resource id.
+                let mut uuid: [u8; 16] = [0; 16];
+                for (idx, byte) in id.to_be_bytes().iter().enumerate() {
+                    uuid[12 + idx] = *byte;
+                }
+                GpuResponse::OkResourceUuid { uuid }
+            }
+        }
+    }
+
     /// Gets the renderer's capset information associated with `index`.
     fn get_capset_info(&self, index: u32) -> GpuResponse {
         let id = match index {