fw_cfg: add fw_cfg_machine_reset function
We must assure that the changed bootindex can take effect when guest is rebooted. So we introduce fw_cfg_machine_reset(), which change the fw_cfg file's bootindex data using the new global fw_boot_order list. Signed-off-by: NChenliang <chenliang88@huawei.com> Signed-off-by: NGonglei <arei.gonglei@huawei.com> Reviewed-by: NGerd Hoffmann <kraxel@redhat.com> Acked-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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