dump-guest-memory: add "detach" support
If "detach" is provided, one thread is created to do the dump work, while main thread will return immediately. For each GuestPhysBlock, adding one more field "mr" to points to MemoryRegion that it belongs, also ref the mr before use. Signed-off-by: NPeter Xu <peterx@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Message-Id: <1455772616-8668-8-git-send-email-peterx@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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