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

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

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.
Cheers,

--
Julien Grall

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