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The syscall return value passed back through the syscall filter callback is semantically signed: negative values encode errno codes. Declaring the sysret pointer as uint64_t * is therefore misleading and forces callers to launder the value through an unsigned temporary. Change the sysret pointer to int64_t * across the public plugin API typedef (qemu_plugin_vcpu_syscall_filter_cb_t), the internal qemu_plugin_vcpu_syscall_filter() prototypes and stub, its implementation in plugins/core.c, the linux-user caller, and the in-tree example plugins. Signed-off-by: Ziyang Zhang <functioner@sjtu.edu.cn> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com> Link: https://lore.kernel.org/qemu-devel/20260618082426.790315-2-functioner@sjtu.edu.cn Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>