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For a board that has multiple framebuffer devices, both of them might want to use DIRTY_MEMORY_VGA on the same memory region. The lack of reference counting in memory_region_set_log makes this very awkward to implement. Suggested-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>