Re: [Xen-devel] [PATCH OSSTEST v5 00/13] support for ARM32 arndale and cubietruck platforms

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2015-01-23 at 12:03 +0000, Stefano Stabellini wrote:
> You are right, I was mistaken.  However keep in mind that only the
> ubuntu stable branch linux-3.16.y-queue has the following important
> backport:
> 
> commit 342443e998bd2dd6406d46c5f7e62540a6d4a170
> Author: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Date:   Fri Nov 21 11:07:39 2014 +0000
> 
>     xen/arm/arm64: introduce xen_arch_need_swiotlb
>     
>     commit a4dba130891271084344c12537731542ec77cb85 upstream.
>     
>     Introduce an arch specific function to find out whether a particular dma
>     mapping operation needs to bounce on the swiotlb buffer.
> 
> the main linux-3.16.y branch (currently tagged v3.16.7-ckt4) doesn't have it 
> yet.
> 
> Without it, DMA is not safe with non-coherent devices.

Hrm, how unfortunate. We expect that patch to land in ckt5 I suppose?

I think we can either wait for ckt5 or you could apply it to your
branch, which means future versions would need merging not
fast-forwarding. Not horrendous I suppose.


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