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HPET device needs to access and update hpet_cfg variable, but now it is defined in hw/i386/fw_cfg.c and Rust code can't access it. Move hpet_cfg definition to hpet.c (and rename it to hpet_fw_cfg). This allows Rust HPET device implements its own global hpet_fw_cfg variable, and will further reduce the use of unsafe C code access and calls in the Rust HPET implementation. Signed-off-by: Zhao Liu <zhao1.liu@intel.com> Link: https://lore.kernel.org/r/20250210030051.2562726-2-zhao1.liu@intel.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>