Re: [PATCH v1 4/9] iommu/vt-d: Add bounce buffer API for domain map/unmap

[Lu Baolu]

Hi,

On 3/13/19 12:38 AM, Christoph Hellwig wrote:
> On Tue, Mar 12, 2019 at 02:00:00PM +0800, Lu Baolu wrote:
> > This adds the APIs for bounce buffer specified domain
> > map() and unmap(). The start and end partial pages will
> > be mapped with bounce buffered pages instead. This will
> > enhance the security of DMA buffer by isolating the DMA
> > attacks from malicious devices.
>
> Please reuse the swiotlb code instead of reinventing it.

I don't think we are doing the same thing as swiotlb here. But it's
always a good thing to reuse code if possible. I considered this when
writing this code, but I found it's hard to do. Do you mind pointing
me to the code which I could reuse?

Best regards,
Lu Baolu