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Windows NetKVM driver (>= 0.1.271) issues unsupported command classes even when they are not even advertised. According to the Virtio 1.2 specification: RX, VLAN, and ANNOUNCE control paths are only meaningful when their corresponding features are negotiated in sections 5.1.3.1, 5.1.6.5.1.2, 5.1.6.5.2.2, and 5.1.6.5.4.1. RX and VLAN are explicitly described as best-effort in sections 5.1.6.5.1 and 5.1.6.5.3. Instead of returning an error to the guest, return success to the guest. Fixes: #7925 Signed-off-by: Wei Liu <liuwe@microsoft.com>