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Implement helper accessors as methods of HPETTimerRegisters. Then HPETTimerRegisters can be accessed without going through HPETTimer or HPETState. In subsequent refactoring, HPETTimerRegisters will be maintained at the HPETState level. However, accessing it through HPETState requires the lock (lock BQL or mutex), which would cause troublesome nested locks or reentrancy issues. Therefore, refactor the accessors of HPETTimerRegisters to bypass HPETTimer or HPETState. Signed-off-by: Zhao Liu <zhao1.liu@intel.com> Link: https://lore.kernel.org/r/20251113051937.4017675-12-zhao1.liu@intel.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>