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[Xen-devel] Having a DOM-U guest with 1:1 mapping in the second stage MMU.

To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>

From: Jorge Pereira <jorge.pereira@xxxxxxx>

Date: Tue, 14 Jan 2020 21:39:14 +0000

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Thread-topic: Having a DOM-U guest with 1:1 mapping in the second stage MMU.

Hi Guys,

I’m currently using XEN in order to run side-by-side a DOM-0 with a DOM-U guest. My use-case scenario requires in the DOM-U direct access to some dma-capable devices such ethernet and some GPUs.

Since our target platform (i.MX8MM) does not support IOMMU, we can’t assign dma-capable devices to the DOM-U guest because XEN does not create 1:1 mapping for that guest in the 2^nd stage MMU. So, guest-virtual addresses are different than the physical ones.

Is it possible to have 1:1 mapping for DOM-U guests? If not, I’m interested to know what would be the estimated effort to support this feature?

Thanks in advance,

Cheers,

Jorge

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