Xen users - Oct 2011 - xl fail to create PV guest with qcow/qcow2 disk images

I''m trying to create a pv guest with qcow/qcow2 disk image by xl, it
always fails atlibxl_device_disk_local_attach.
#xl create pv_config_file
libxl: error: libxl.c:1119:libxl_device_disk_local_attach: cannot locally attach
a qdisk image if the format is not raw
libxl: error: libxl_create.c:467:do_domain_create: failed to run bootloader: -3 

Does that mean we cannot create such a pv guest by xl? I''m not clear
why it behaves like this, could anyone give some hints?

Thanks! 


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