If I select to let my guest XP enter standby mode by clicking the button 
manually. qemu will exit with the following message left:

ioport_write: PANIC d->guest_slots[val].active failed

the following is my command to start qemu:

/home/huikai/qemu15/bin/qemu --enable-kvm  -m 768  -drive 
file=/home/huikai/winxp_dev.img,if=virtio  -net nic,model=virtio -net 
user -usb -usbdevice tablet -vga qxl  -localtime  -device virtio-serial 
-chardev spicevmc,name=vdagent,id=vdagent -device 
virtserialport,chardev=vdagent,name=spice0 -spice 
port=1234,disable-ticketing -monitor telnet:localhost:12341,server,nowait

Qemu is 0.15v
gxl driver is qxl-0.10-20112808.zip from http://spice-space.org/download.html

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