I have what I think is the same problem. Windows XP guest on jaunty x86_64 host:
$ kvm  -hda windows_xp.qcow2 -boot c -m 1024 -localtime -serial /dev/ttyS0

Setting the baudrate on Windows also modifies the baudrate on the jaunty
host, but no data is transferred.

When I run:
$ qemu  -hda windows_xp.qcow2 -boot c -m 1024 -localtime -serial /dev/ttyS0
Could not open '/dev/kqemu' - QEMU acceleration layer not activated: Permission 
denied

all works well, though very slowly !

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ttyS0 pass through in guest running  in KVM doesn't work and eventually hangs
https://bugs.launchpad.net/bugs/370270
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