Re: [Xen-devel] Fail to boot Dom0 on Xen Arm64 after "dma-mapping: bypass indirect calls for dma-direct"

[Julien Grall <julien.grall@xxxxxxx>]

(+ Leo Yan who reported a similar issues on xen-devel)

Hi Christoph,

On 16/01/2019 18:19, Christoph Hellwig wrote:
> Does this fix your problem?
Thank you for the patch. This allows me to boot Dom0 on Juno r2.

My knowledge of DMA is quite limited, so I may have missed something.

Looking at the change for arm64, you will always call dma-direct API. In 
previous Linux version, xen-swiotlb will call dev->archdata.dev_dma_ops (a copy 
of dev->dma_ops before setting Xen DMA ops) if not NULL. Does it mean we expect 
dev->dma_ops to always be NULL and hence using dma-direct API?
Cheers,

--
Julien Grall

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