1.更换内核
#wget /centos/6/xen-c6/x86_64/RPMS/kernel-3.4.53-8.el6.centos.alt.x86_64.rpm
2.安装
#rpm –ivh kernel-3.4.53-8.el6.centos.alt.x86_64.rpm
3.重启
#init 6
4.重新加载kvm内核
#rmmod kvm-intel
# modprobekvm-intel nested=1
5.把cpu虚拟化特性暴露给虚拟机
虚拟机配置文件cpu选项添加多一项
<cpu mode='host-passthrough' />
