fix persist mode of xen
fix persist mode of xen

Signed-off-by: Wang Xu <0e9dfdf30d71e7ded2bba4a3dc006039c4b00f3d@gmail.com>

laijs/hyper,hyperhq/hyper,heiden-deng/hyper,gao-feng/hyper,hyperhq/hyperd,laijs/hyper,gnawux/hyper,Crazykev/hyper,hyperhq/hyper,ZJU-SEL/hyper,hyperhq/hyper,hyperhq/hyperd,ruo91/hyper,bergwolf/hyperd,laijs/hyper,ksmaheshkumar/hyper,bergwolf/hyperd,WIZARD-CXY/hyper,heiden-deng/hyper,gao-feng/hyper,laijs/hyperd,WIZARD-CXY/hyper,bergwolf/hyperd,no2key/hyper,hyperhq/hyper,ZJU-SEL/hyper,gao-feng/hyper,ksmaheshkumar/hyper,feiskyer/hyper,gao-feng/hyper-public,Crazykev/hyper,laijs/hyperd,gao-feng/hyper-public,no2key/hyper,WIZARD-CXY/hyper,jefby/hyper,gao-feng/hyper,feiskyer/hyper,ruo91/hyper,jefby/hyper,gnawux/hyper,feiskyer/hyper,ZJU-SEL/hyper,gnawux/hyper,WIZARD-CXY/hyper,hyperhq/hyperd,feiskyer/hyper,jefby/hyper,laijs/hyper,heiden-deng/hyper,gao-feng/hyper-public,ruo91/hyper,ksmaheshkumar/hyper,no2key/hyper,ZJU-SEL/hyper,laijs/hyperd,heiden-deng/hyper,ksmaheshkumar/hyper,jefby/hyper,ruo91/hyper,bergwolf/hyperd,Crazykev/hyper,no2key/hyper