Re: [Xen-devel] [PATCH v5 0/8] qdisk local attach

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.05.12 at 13:12, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> 
>>> wrote:
> Hi all,
> this patch implements local_attach support for QDISK: that means that
> you can use qcow2 as disk format for your PV guests disks and use
> pygrub to retrieve the kernel and initrd in dom0.
> 
> The idea is that we start a QEMU instance at boot time to listen to
> local_attach requests. When libxl_device_disk_local_attach is called on
> a QDISK images, libxl sets up a backend/frontend pair in dom0 for the disk
> so that blkfront in dom0 will create a new xvd device for it.
> Then pygrub can be pointed at this device to retrieve kernel and
> initrd.

So I pulled this into my local tree to be able to debug problems in
our gntdev driver in a reasonably isolated way (i.e. not needing
to fire up guests). While block-attach works fine, block-detach
doesn't at all. This may be related to me using the deprecated
file:/ form of specifying the source during attach, as all of the
supposedly modern forms I tried weren't accepted by the parser.

Jan


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