[Xen-devel] Re: 3.0.3rc3 qcow image created with qemu-img not usable?

[Anthony Liguori <aliguori@xxxxxxxxxx>]

You cannot attach block devices to Domain-0.  Furthermore, you cannot 
attach non-raw file-based block devices to paravirtual domains.
Regards,

Anthony Liugoir

Timo Benk wrote:
> Hi,
>
> i am new to the qcow image format, so please forgive me if the following
> is just totally stupid:-)
>
> I try to use a qcow formatted image in Xen created by qemu-img.
>
> # qemu-img create -f qcow /tmp/test.img 1G
>
> Then i try to attach that image to Domain-0.
>
> # xm block-attach Domain-0 tap:qcow:/tmp/test.img /dev/xvda1 w 0
>
> No error message so far, but ...
>
> # mount /dev/xvda1 /mnt
> mount: special device /dev/xvda1 does not exist
>
> # xm block-list Domain-0
> Vdev  BE handle state evt-ch ring-ref BE-path
> 51714    0    0     3      23     8
>   /local/domain/0/backend/tap/0/51714
>
> # xm block-detach Domain-0 /dev/xvda1
>
> # xm block-list Domain-0
> Vdev  BE handle state evt-ch ring-ref BE-path
> 51714    0    0     3      23     8
>   /local/domain/0/backend/tap/0/51714
>
> qcow images created with qcow-create are working without any problems.
>
> And a few additional questions i have:
>
> - Is qcow encryption supported?
> - is qcow compression supported?
>
> Greetings,
> -timo
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