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



(+ 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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