test@debian:~/w/install$ sudo ./xen/sbin/xl create ~/w/images/domU_hvm.cfg 
Parsing config from /home/test/w/images/domU_hvm.cfg
libxl: error: libxl_qmp.c:334:qmp_handle_error_response: Domain 2:received an error message from QMP server: Mapping machine irq 18 to pirq -1 failed: Function not implemented
libxl: error: libxl_pci.c:1300:libxl__add_pcidevs: Domain 2:libxl_device_pci_add failed: -3
libxl: error: libxl_create.c:1522:domcreate_attach_devices: Domain 2:unable to add pci devices
libxl: error: libxl_domain.c:1034:libxl__destroy_domid: Domain 2:Non-existant domain
libxl: error: libxl_domain.c:993:domain_destroy_callback: Domain 2:Unable to destroy guest
libxl: error: libxl_domain.c:920:domain_destroy_cb: Domain 2:Destruction of domain failed