I use the following command to run a windows guest.
qemu -m 6000 -cpu Opteron_G5 -smp 4 -hda winxp64_c.img -hdb winxp64_d.img --boot c -usbdevice tablet -enable-kvm -device e1000,netdev=host_files -netdev user,net=
10.0.2.0/24,id=host_files,restrict=off,smb=/home/mahmood,smbserver=10.0.2.4 -vnc :1
In another terminal, I then ran "vncveiwer :1" to connect to the guest. Unfortunately, the screen size if 640x480 I think which is very small. I tried
But the size is still small.