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SubjectRe: [PATCH 2/6] KVM MMU: fix kvm_mmu_zap_page() and its calling path


Marcelo Tosatti wrote:

>> @@ -1483,8 +1483,8 @@ static int mmu_zap_unsync_children(struct kvm *kvm,
>> for_each_sp(pages, sp, parents, i) {
>> kvm_mmu_zap_page(kvm, sp);
>> mmu_pages_clear_parents(&parents);
>> + zapped++;
>> }
>> - zapped += pages.nr;
>> kvm_mmu_pages_init(parent, &parents, &pages);
>> }
>
> Don't see why this is needed? The for_each_sp loop uses pvec.nr.

I think mmu_zap_unsync_children() should return the number of zapped pages then we
can adjust the number of free pages in kvm_mmu_change_mmu_pages(), but pages.nr no
only includes the unsync/zapped pages but also includes their parents.

Thanks,
Xiao


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