Hi all,  In xen-4.1.2 src/tools/libxl/libxl_dm.c, there is a function called `libxl_build_device_model_args_old`, Âthe func will build qemu-dm cmdline args according to
the xl-formated configuration file specified by xl create
domid: 2
-videoram option does not work with cirrus vga device model. Videoram set to 4M.
Strip off blktap sub-type prefix to /home/malei/c2.delta.img (drv 'qcow2')
Using file /home/malei/c2.delta.img in read-write mode
Strip off blktap sub-type prefix to /home/malei/d2.delta.img (drv 'qcow2')
Using file /home/malei/d2.delta.img in read-write mode
Watching /local/domain/0/device-model/2/logdirty/cmd
Watching /local/domain/0/device-model/2/command
Watching /local/domain/2/cpu
char device redirected to /dev/pts/4
qemu_map_cache_init nr_buckets = 10000 size 4194304
shared page at pfn feffd
buffered io page at pfn feffb
Guest uuid = d06b08f0-491f-43d6-9a01-ac317aea5034
populating video RAM at ff000000
mapping video RAM from ff000000
Register xen platform.
Done register platform.
platform_fixed_ioport: changed ro/rw state of ROM memory area. now is rw state.
qemu: match NIC model: rtl8139
pci_rtl8139_init: s->macaddr: 0 16 3e eb ca 66
xs_read(/local/domain/0/device-model/2/xen_extended_power_mgmt): read error ÂÂ