Re: [PATCH v4] kvm: Fix page ageing bugs

From: Paolo Bonzini
Date: Tue Sep 23 2014 - 13:10:42 EST

Il 23/09/2014 19:04, Andres Lagar-Cavilla ha scritto:
> I'm not sure. The addition is not always by PAGE_SIZE, since it
> depends on the current level we are iterating at in the outer
> kvm_handle_hva_range(). IOW, could be PMD_SIZE or even PUD_SIZE, and
> is_large_pte() enough to tell?
> This is probably worth a general fix, I can see all the callbacks
> benefiting from knowing the gfn (passed down by
> kvm_handle_hva_range()) without any additional computation, and adding
> that to a tracing call if they don't already.
> Even passing the level down to the callback would help by cutting down
> to one arithmetic op (subtract rmapp from slot rmap base pointer for
> that level)

You're right. Let's apply this patch and work on that as a follow-up.

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