1 files changed, 57 insertions, 0 deletions
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@@ -0,0 +1,57 @@
+device: 0.952
+kernel: 0.945
+graphic: 0.903
+performance: 0.899
+debug: 0.882
+architecture: 0.876
+files: 0.858
+hypervisor: 0.850
+PID: 0.841
+assembly: 0.832
+register: 0.814
+mistranslation: 0.813
+semantic: 0.808
+ppc: 0.807
+socket: 0.772
+user-level: 0.761
+virtual: 0.760
+x86: 0.757
+permissions: 0.755
+arm: 0.738
+risc-v: 0.737
+vnc: 0.728
+TCG: 0.720
+network: 0.699
+i386: 0.681
+boot: 0.663
+VMM: 0.644
+peripherals: 0.619
+KVM: 0.599
+
+Virtio-GPU doesn't fill Response data for cursor queue
+Description of problem:
+Implementation of virtio-gpu in Qemu is likely not fill Response header in cursor commands.
+
+Inside the virtio 1.2 specification, document said:
+```
+VIRTIO_GPU_CMD_UPDATE_CURSOR
+    Update cursor. Request data is struct virtio_gpu_update_cursor. Response type is VIRTIO_GPU_RESP_OK_NODATA.
+    Full cursor update. Cursor will be loaded from the specified resource_id and will be moved to pos. The driver must 
+    transfer the cursor into the resource beforehand (using control queue commands) and make sure the commands to fill 
+    the resource are actually processed (using fencing).
+
+VIRTIO_GPU_CMD_MOVE_CURSOR
+    Move cursor. Request data is struct virtio_gpu_update_cursor. Response type is VIRTIO_GPU_RESP_OK_NODATA.
+    Move cursor to the place specified in pos. The other fields are not used and will be ignored by the device.
+```
+The cursor commands do have a response like control commands.
+
+But in [hw/display/virtio-gpu.c#L1136](https://gitlab.com/qemu-project/qemu/-/blob/master/hw/display/virtio-gpu.c#L1136), QEMU doesn't care anything about response, just fetching command and execute.
+
+It this a Implementation compromise or I missing something in the specification?
+Steps to reproduce:
+1. Write any kernel that using virtio-gpu.
+2. Run on qemu.
+3. No response on cursor command.
+Additional information:
+Specification: [virtio-v1.2-cs01.html](https://docs.oasis-open.org/virtio/virtio/v1.2/cs01/virtio-v1.2-cs01.html#x1-3650007)