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SubjectRe: [PATCH 3/4] KVM: MMU: reduce the size of mmu_page_path

On 03/25/2016 09:45 PM, Paolo Bonzini wrote:
> On 25/03/2016 14:19, Xiao Guangrong wrote:
>> Currently only PT64_ROOT_LEVEL - 1 levels are used, one additional entry
>> in .parent[] is used as a sentinel, the additional entry in .idx[] is
>> purely wasted
>> This patch reduces its size and sets the sentinel on the upper level of
>> the place where we start from
> This patch and the previous one are basically redoing commit
> 0a47cd85833e ("KVM: MMU: Fix ubsan warnings", 2016-03-04). While you
> find your version easier to understand, I of course find mine easier.
> Rather than getting stuck in a ko fight, the solution is to stick with
> the code in KVM and add comments. I'll give it a try...

If you do not like this one, we can just make the .index is
[PT64_ROOT_LEVEL - 1] and keep the sentinel in .parents[], that little
change and nice code shape.

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