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We can now demonstrate what previous changes allow us to do. Since all callbacks have a userdata pointer, we can use that mechanism to move an object through all of them. In other words, we can now have stateful plugins without resorting to any global variable. As an example, we implement tb counting plugin with our cpp plugin. It produces an output similar to hotblocks, with same performance. Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org> Link: https://lore.kernel.org/qemu-devel/20260615193526.2883349-27-pierrick.bouvier@oss.qualcomm.com Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>