Re: [Xen-devel]xl create PV guest with qcow/qcow2 disk images fail

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 19 Oct 2011, Stefano Stabellini wrote:
> On Fri, 14 Oct 2011, Chun Yan Liu wrote:
> > Hi, List,
> > 
> > I'm trying xl create a pv guest with qcow/qcow2 image, it always fails at 
> > libxl_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
> > 
> > disk configuration is:
> > disk=[ 'tap:qcow2:/var/lib/xen/images/sles11pv/disk0.qcow2,xvda,w', ]
> > 
> > Is there any way to make it work?
> 
> This is a PV guest configured with pygrub, correct?
> If so, qcow/qcow2 are not supported in this scenario.
> 
> You could:
> 
> - avoid using pygrub (specify the kernel manually) and keep using qcow/qcow2;
> - switch to raw disks and keep using pygrub;
> - install a Linux kernel that support blktap2 (like the XCP kernel, see
>   http://wiki.xen.org/xenwiki/XenDom0Kernels) and switch to VHD format.
> 

The way to make it work would be to call qemu-nbd and nbd-client from xl
so that a /dev/nbd0 comes up in dom0 and pygrub can use it to extract
the kernel and initrd from the qcow2 image.

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