最新版本的spice-vdagent-0.10.1经过自己实验，是可用的，确实解决了一些问题，先看一下官方的说法：
Spice agent for Linux
=====================
The spice agent for Linux consists of 2 parts, a daemon spice-vdagentd and
a per X-session process spice-vdagent. The daemon gets started in Spice guests
through a Sys-V initscript. The per X-session gets automatically started in
desktop environments which honor /etc/xdg/autostart, and under gdm.
The main daemon needs to know which X-session daemon is the currently
active X-session (think switch user functionality) for this console kit is
used. spice-vdagent can be compiled without console kit support for use with
older distributions, in this case only one active X session is allowed.
Features:
* Client mouse mode (no need to grab mouse by client, no mouse lag)
this is handled by the daemon by feeding mouse events into the kernel
via uinput. This will only work if the active X-session is running a
spice-vdagent process so that its resolution can be determined.
* Automatic adjustment of the X-session resolution to the client resolution
for single monitor configurations.
* Support of copy and paste (text and images) between the active X-session
and the client. This supports both the primary selection and the clipboard.
* Limited support for multiple displays, prerequisites:
* A new enough Xorg-server. For Fedora atleast Fedora-17, for RHEL-6 atleast
xorg-x11-server-1.10.4-6.el6_2.3
* A vm configured with multiple qxl devices
* A guest running the latest spice-vdagent
Then connect to the vm with the multiple monitor client which you want to
use it with using: "spicec --full-screen=auto-config" (or the user portal
equivalent). At this point the agent will write out a:
/var/run/spice-vdagentd/xorg.conf.spice file. With all the necessary magic
to get Xinerama working. Move this file to /etc/X11/xorg.conf, then kill
Xorg so that it will get restarted and you should be good to go.
All vdagent communications on the guest side run over a single pipe which
gets presented to the guest os as a virtio serial port.
概括一下它的功能：
- Copy & Paste between guest and client
- Automatic guest resolution adjustment while entering fullscreen mode
- Guest side mouse which allows you to move mouse continuously within guest and client without pressing Sihft + F12
利用正常的kvm命令进行启动，加入以下选项：
For qemu < 0.14.0:
-device spicevmc
For qemu >= 0.14.0:
-device virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pci.0,addr=0x5 \
-chardev spicevmc,name=vdagent,id=vdagent \
-device \
virtserialport,nr=1,bus=virtio-serial0.0,chardev=vdagent,name=com.redhat.spice.0
qemu-kvm -device virtio-serial -chardev spicevmc,id=vdagent,debug=0,name=vdagent -device virtserialport,chardev=vdagent,name=com.redhat.spice.0 -spice port=3001,disable-ticketing -vga qxl -soundhw ac97 /path/to/your/guest.img
If you're facing -chardev issue (Then you're probably using older qemu-kvm from RHEL6) then use following arguments instead.
qemu-kvm -device virtio-serial -device spicevmc -device virtserialport -spice port=3001,disable-ticketing -vga qxl -soundhw ac97 /path/to/your/guest.img
或kvm -m 1024 -name rhel6 -drive file=rhel6.img,if=virtio -vga qxl -spice port=5900,addr=127.0.0.1,disable-ticketing -device virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pci.0,addr=0x5 -chardev spicevmc,name=vdagent,id=vdagent -device virtserialport,nr=1,bus=virtio-serial0.0,chardev=vdagent,name=com.redhat.spice.0
通过实验，文本双向拷贝可行，但images不可行。
大家的实验结果如何呢，相互交流。