[PATCH v10 09/12] swiotlb: Add restricted DMA pool initialization

[Christoph Hellwig]

On Tue, Jun 15, 2021 at 09:27:08PM +0800, Claire Chang wrote:
> Add the initialization function to create restricted DMA pools from
> matching reserved-memory nodes.
> 
> Regardless of swiotlb setting, the restricted DMA pool is preferred if
> available.
> 
> The restricted DMA pools provide a basic level of protection against the
> DMA overwriting buffer contents at unexpected times. However, to protect
> against general data leakage and system memory corruption, the system
> needs to provide a way to lock down the memory access, e.g., MPU.
> 
> Signed-off-by: Claire Chang <tientzu at chromium.org>

Looks good,

Reviewed-by: Christoph Hellwig <hch at lst.de>