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+device: 0.940
+socket: 0.913
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+performance: 0.823
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+user-level: 0.774
+architecture: 0.772
+graphic: 0.768
+semantic: 0.766
+network: 0.764
+arm: 0.729
+debug: 0.717
+boot: 0.715
+VMM: 0.712
+kernel: 0.671
+vnc: 0.658
+PID: 0.650
+ppc: 0.641
+x86: 0.604
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+peripherals: 0.597
+permissions: 0.595
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+mistranslation: 0.516
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+assembly: 0.434
+KVM: 0.190
+
+vhost-device-snd does not report correctly the device conf size
+Description of problem:
+The vhost-user-snd frontend is incorrectly reporting the size of the device configuration space, which should be based on the features exposed by the device. For example, the `controls` field in the `virtio_snd_config` structure is optional and should only be included in the configuration size if the `VIRTIO_SND_F_CTLS` feature has been negotiated.  
+
+This issue became apparent after commit `ab0c7fb2`, where `virtio_snd_config` was updated to include the `controls` field. The vhost-user-snd frontend, relying on this structure, started expecting `sizeof(virtio_snd_config)` when communicating with the backend, regardless of whether the `VIRTIO_SND_F_CTLS` feature was negotiated. As a result, any backend reporting a smaller configuration size—for example, one that does not support controls—cannot communicate with the frontend. We observed this problem in the vhost-device-sound rust-vmm device, which we partially fixed [here](https://github.com/rust-vmm/vhost-device/commit/8e7b7109316e1027548bc91cfcbb4b096b032c24).  
+
+This behavior is incorrect because the configuration size should depend on the negotiated features.
+
+I am currently working on patch to fix this.
+Steps to reproduce:
+1. Run vhost-device-sound
+```bash
+ cargo run --bin vhost-device-sound -- --socket=/tmp/vhost-sound.socket --backend=pipewire
+```
+2. Run QEMU with the parameters above
+3. In the guest run:
+```bash
+root@syzkaller:~# aplay /usr/share/sounds/alsa/Front_Left.wav 
+aplay: main:830: audio open error: No such file or directory
+```
+Additional information:
+