SlackBuildsOrg/system/spice-vdagent

spice-vdagent (spice agent for Linux vms)

spice-vdagent enhanches interactions with your Linux virtual guests:
- client mouse mode
- automatic adjustment of the X-session resolution to the client's one
- support of copy and paste
- limited support for multiple displays using Xinerama
- full support for multiple displays using Xrandr

as this is meant to be installed on a kvm guest using spice, you
might want to use it alongside xf86-video-qxl installed on the same
vm.