[Xen-devel] Unable to install Precise domU PV on xen 4.2.0

[Fabio Fantoni <fantonifabio@xxxxxxxxxx>]

Dom0 is wheezy 64 bit, kernel 3.2.23-1 from debian repository, xen 4.2.0 
compiled from source
When I try to install Precise domU PV with this xl configuration file:
--------------------------------------------
PRECISE.cfg
----------------
name='PRECISE'
memory=1024
vcpus=2
disk=['/mnt/vm/disks/PRECISE.disk1.xm,raw,xvda1,rw', 
'/mnt/vm/disks/PRECISE.disk2.xm,raw,xvda2,rw']
#disk=['/mnt/vm/disks/PRECISE.disk1.xm,raw,xvda,rw']
vif=['bridge=xenbr0']
vfb=['vnc=1,vncunused=1,vnclisten=0.0.0.0,keymap=it']
xen_platform_pci=1
#bootloader='pygrub'
#kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
#extra = "(hd0,0)/grub/grub.cfg"
# Only for installation
kernel="/boot/domu/precise/vmlinuz"
ramdisk="/boot/domu/precise/initrd.gz"
extra = "debian-installer/exit/always_halt=true -- quiet console=hvc0"
--------------------------------------------

The vmlinux and initrd take from here:
http://archive.ubuntu.com/ubuntu/dists/precise-updates/main/installer-amd64/current/images/netboot/xen/

xl create /etc/xen/PRECISE.cfg
Parsing config from /etc/xen/PRECISE.cfg
libxl: error: libxl_device.c:858:device_backend_callback: unable to 
disconnect device with path /local/domain/0/backend/vbd/2/51713
libxl: error: libxl_device.c:858:device_backend_callback: unable to 
disconnect device with path /local/domain/0/backend/vbd/2/51714
libxl: error: libxl_create.c:933:domcreate_launch_dm: unable to add disk 
devices
libxl: error: libxl_device.c:858:device_backend_callback: unable to 
disconnect device with path /local/domain/0/backend/vbd/2/51713
libxl: error: libxl_blktap2.c:73:libxl__device_destroy_tapdisk: Unable 
to find type aio disk /mnt/vm/disks/PRECISE.disk1.xm: No such file or 
directory
libxl: error: libxl_device.c:858:device_backend_callback: unable to 
disconnect device with path /local/domain/0/backend/vbd/2/51714
libxl: error: libxl.c:1465:devices_destroy_cb: libxl__devices_destroy 
failed for 2
/mnt/vm/disks/PRECISE.disk1.xm exist, domU hvm with raw disks works

Is xen bug, kernel bug or my error?
Thanks for any reply

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