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Add a helper function to check whether the device is realized without requiring the Big QEMU Lock. The next patch adds a second caller. The goal is to avoid spreading DeviceState field accesses throughout the code. Suggested-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20230516190238.8401-3-stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>