Attempting to achieve 1920x2400 VGA resolution

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I've been attempting to patch up the qemu-kvm package to allow me to
achieve a display resolution of 1920x2400.  I followed the suggestions
from the Wiki FAQ on the subject, but ran into a wall.

I patched up the hw/vga_int.h file to bump VBE_DISPI_MAX_YRES to 2400,
and (as a test) replaced the 2560x1600 entries with 1920x2400 in
vgabios/vbetables-gen.c.

The output of the Xorg.0.log file in the guest VM (CentOS 5.3), lists
the new modes, but complains with the following error,

"(EE) VESA(0): Virtual height (2400) is too large for the hardware (max 2048)"

I have found where in the guest XServer that this line comes out
(hw/xfree86/common/xf86Mode.c), but have not been able to find where
this limit (2048) is being defined.

I've tried changing "VGA_MAX_HEIGHT" to 2400 in vga_int.h, but this
didn't make a difference.  There must be something special about the
height, as the width can obviously be as large as 2560.

Can anyone point me in the right direction for where this limit of
2048 might be imposed, and how I might increase it?

Thanks,
Craig
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