r487 THE GL/VULKAN VASPACE WALL: clamp RM_CONTROL replies to the 64 KB wire record bound (16 x 4096; guest GspMsgQueueReceiveStatus rejects hdr + rpc.length beyond it - 'Incorrect message length 67448', rpcRecvPoll 0x3a, NV_ERR_INVALID_PARAMETER). The stock driver sends PERF_VPSTATES_INFO (0x2080a0a4, paramsSize 67392) during Xorg VASpace construction; the generic reply echoed the whole buffer as a 17-element record the guest refused, vmmCreateVaspace returned ffff and GL died with 'Failed to allocate VASpace object' / EGL_BAD_ALLOC on every prior session. A real GSP-RM cannot reply past the bound either; the echo is clamped with the tail zeroed

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