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 <redacted>

Looks good,

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