Re: [PATCH] KVM: x86: Avoid zapping mmio sptes twice for generation wraparound

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Il 03/07/2013 11:10, Gleb Natapov ha scritto:
> On Wed, Jul 03, 2013 at 11:08:18AM +0200, Paolo Bonzini wrote:
>> Il 03/07/2013 11:05, Gleb Natapov ha scritto:
>>>>> Yes, the actual operation would be the same as this patch.  You can
>>>>> rename kvm_mmu_invalidate_mmio_sptes to kvm_arch_memslots_installed, or
>>>>> something like that.  But it would have to touch all architectures.
>>>>
>>>> I tried to avoid introducing x86-centric code into the generic one.
>>>>
>>>> If another arch can gain something by such function, I'm willing to
>>>> touch all arch code.
>>>>
>>> Please do. X86 is the most optimized one so it does things other arches
>>> do not yet. Slot generation update hook sounds generic enough.
>>
>> Yes, makes sense.  However, this patch is still an improvement because
>> the current code is too easily mistaken for an off-by-one bug.
>>
>> Any improvements to the API can go on top.
>>
> If Takuya will send the proper fix shortly I do not see any reason to
> apply this one. It does not fix any bug.

It is still a small bug to do two zaps when only one is needed...

Paolo
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