Re: [PATCH v2 4/4] crypto: starfive - Add hash and HMAC support

[Christoph Hellwig]

On Thu, Feb 09, 2023 at 09:33:06AM +0000, JiaJie Ho wrote:
> > Why do you copy everything before you feed it to the hardware?
> > If the issue is alignment then surely you should only to copy a small amount
> > of header (and perhaps trailer) for that?
> > 
> 
> The DMA can only support 32-bit addressing.
> So, I am copying everything in case kernel allocated memory region >32-bit for a user app.

The DMA API takes care of that.