fedora domU serial console how to ?

[mantra UNIX]

Hi,
How do i configure a serial console for a f10/x86_64/PV guest to work.

/boot/grub/grub.conf:
...
title Fedora (2.6.27.21-170.2.56.fc10.x86_64)
        root (hd0,0)
        kernel /vmlinuz-2.6.27.21-170.2.56.fc10.x86_64 ro
root=/dev/rootvg/root_lv rhgb quiet console=ttyS0
        initrd /initrd-2.6.27.21-170.2.56.fc10.x86_64.img
...

The above dose not work.

-- 
Regards,
mantra - Instrument of Thought
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