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...ld not be copied to target while its pfn_type and pfn number would be transferred to target, so that at target, it would set p2m as p2m_ram_broken for broken page. Patch 02 handles the case that broken page occurred during migration: At the sender, marks the broken page to dirty bitmap, so that at copypages stage of migration, its pfn_type and pfn number would transfer to target. At the target, it would set p2m as p2m_ram_broken for broken page. Thanks, Jinsong