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Re: [Xen-devel] [PATCH 4/6] arm: add a small kconfig for Renesas RCar H3

On 04/24/2018 10:52 AM, Andrii Anisov wrote:
Hello Julien,

Hi Andrii,

On 24.04.18 12:01, Julien Grall wrote:
You can't unselect HAS_PASSTHROUGH support. Given that you are going to have passthrough in the future, I don't much see the point to try to allow that option to be disabled.
If we are speaking of R-Car Gen3, you might be right. We are targeting IPMMU support upstreamed. What about IOMMU-less platforms?
For everything you disable, you double the number of configuration possible. So we have to weight the benefits of disabling some code.

I believe that passthrough should be kept as core Xen, it is small and quite tight to the rest of Xen.

But I would be interested to know what would be the rationale to disable that. Do you foresee certification on IOMMU-less platform?


Julien Grall

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