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Using kvm_mmu_prepare_zap_page() and kvm_mmu_commit_zap_page() to split kvm_mmu_zap_page() function, then we can: - traverse hlist safely - easily to gather remote tlb flush which occurs during page zapped Those feature can be used in the later patches Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Avi Kivity <avi@redhat.com>