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[Xen-users] Configure video memory in PV guest

I am trying to change the amount of memory allocated to a PV guest. My xl 
config file is below.  As you can see I have tried several configurations and 
they have either had no effect or prevented boot.

extra="root=UUID=cfb3534e-ce49-4327-b65c-83d638a285f1 ro quiet splash"
name = "ubuntu"
vfb = [ 'sdl=1' ]
vif = [ 'bridge=xenbr0' ]
dhcp = "dhcp"
disk = [ '/home/ubuntu/installed/disk.img,,sda' ]
memory = 2048
maxmem = 2048
vcpus = 1
maxvcpus = 1
vnc = 1
device_model_args=['-device qxl-vga,vram_size_mb=64']
#device_model_args=['-device VGA,vgamem_mb=64,bus=pci.0,addr=0x2']
#device_model_args=['-device VGA,vgamem_mb=64']


The device_model_args that is not commented out results in having:

-device qxl-vga,vram_size_mb=64

as an argument to qemu-system-i386. and I get a 'No PCI bus found error'. 
However if I just run:

qemu-system-i386 -device qxl-vga,vram_size_mb=64

then qemu starts without an issue so I think I have the syntax correct at 
least. Is there any way to increase the video RAM for PV guests?

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