Function reshape_and_cache_fp8 

pub fn reshape_and_cache_fp8(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    key: DevicePtr,
    value: DevicePtr,
    k_cache: DevicePtr,
    v_cache: DevicePtr,
    slot_mapping: DevicePtr,
    num_tokens: u32,
    num_kv_heads: u32,
    head_dim: u32,
    block_size: u32,
    k_scale: f32,
    v_scale: f32,
    key_stride: u32,
    value_stride: u32,
    cache_stride: u64,
    stream: u64,
) -> Result<()>

k_cache/v_cache are the full pool base pointers. cache_stride is in elements (block_size * num_kv_heads * head_dim).