1. for guest xml desc:
2. 在windows guest里面安装ballooning驱动：
a) 下载并安装devcon,
b) devcon install BALLOON.inf "PCI\VEN_1AF4&DEV_1002&SUBSYS_00051AF4&REV_00"
3. 重启guest, 使用qemu monitor测试:
virsh # qemu-monitor-command winxp --hmp "info balloon"
balloon: actual=1024
virsh # qemu-monitor-command winxp --hmp "balloon 512"
virsh # qemu-monitor-command winxp --hmp "info balloon"
balloon: actual=512
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