Subject: Re: [PATCH] xen: introduce xen_vring_use_dma

On Mon, Jun 29, 2020 at 06:25:41AM +0000, Peng Fan wrote:

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Anyway, re-reading the last messages of the original thread
[1], it looks like Peng had a clear idea on how to fix the general issue.
Peng, what happened with that?

We shrinked the rpmsg reserved area to workaround the issue.
So still use the dma apis in rpmsg.

But here I am going to address domu android trusty issue using virtio.

My suggestion is to first of all fix DMA API so it works properly.

Could you please elaborate more details?

You mean the DMA API usage of rpmsg? Or xen domu dma_ops?

Thanks,
Peng.

Not 100% sure but I think xen dma ops.

Sorry to ask again, could you explain more details about what issues
do you see of current xen ARM domu dma_ops? 
Or Dom0 swiotlb xen dma_ops?

Thanks,
Pen.g

--
MST

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