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


On 04/24/2018 03:18 PM, Andrii Anisov wrote:

Can you quantify what would be the cost of keeping that code around for IOMMU-less platform?
I'm not sure I understand your question. Do you mean a number of loc of the passthrough feature for arm?

I meant that disabling something in Xen will come with a cost. While for a driver the maintenance is fairly minimal for anything touching core Xen it will require some more work for any change. So I understand that it will make Xen slightly smaller (~600 lines), but at what cost?

In other words, I am all for disabling unnecessary driver in Xen with some caveats (see my other answers). But I am quite worry on the burden for anything else without any real assessment.


Julien Grall

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