Re: [Xen-devel] missing block script support for qemu in libxl

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Wed, Nov 18, 2015 at 9:25 AM, Olaf Hering <olaf@xxxxxxxxx> wrote:
> Why does libxl now allow script= with backend=tap|qdisk? See
> tools/libxl/libxl_device.c:disk_try_backend.
>
> Ideally the script should prepare the backend storage based on info from
> target=. Then the script should report either the dentry to be used by
> qemu back to libxl, or it should setup the "physical-device" entry to be
> used by blkback.
>
> Right now the target= info is passed to the script, but its also used as
> ->pdev_path for qemu. Obvisouly qemu cant possibly make sense of the
> target= info, because its meant for the script=.
>
> tools/libxl/check-xl-disk-parse has some script examples. I think right
> now its not possible to boot an HVM guest from iscsi, for example.
>
> Should the logic in libxl be changed to make scripts= more useful, and
> let libxl read info for qemu which has to be provided by the script?

You mean, should the bug wherein HVM domains with emulated disks
(which is all of them, by default) cannot use block scripts be fixed?
Yes it should, and I'm working on it at the moment.

 -George

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