Re: [RFC 0/6] iommu: generic api migration and grouping

From: Roedel, Joerg
Date: Tue Jun 07 2011 - 03:52:12 EST

On Mon, Jun 06, 2011 at 04:09:33PM -0400, Ohad Ben-Cohen wrote:
> On Mon, Jun 6, 2011 at 10:20 PM, Roedel, Joerg <Joerg.Roedel@xxxxxxx> wrote:
> > Well, it certainly makes sense to have a single implementation for this.
> > But I want to hide this complexity to the user of the IOMMU-API. The
> > best choice is to put this into the layer between the IOMMU-API and the
> > backend implementation.
> I agree.
> The IOMMU API should take physically contiguous regions from the user,
> split them up according to page-sizes (/alignment requirements)
> supported by the hardware, and then tell the underlying implementation
> what to map where.

Yup. Btw, is there any IOMMU hardware which supports non-natural
alignment? In this case we need to expose these requirements somehow.



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