From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: Driver domains and hotplug scripts, redux
Date: Tue, 31 Jan 2012 20:02:34 +0000
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To: Roger Pau =?ISO-8859-1?Q?Monn=E9?= <roger.pau@entel.upc.edu>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org

On Tue, 2012-01-31 at 09:57 +0000, Roger Pau Monn=E9 wrote:
> =

> =

> What I don't get is what you do when you have to boot a PV DomU which
> root HDD is on the driver domain. Dom0 needs the kernel/initrd from
> the HDD (usually extracted using pygrub). Since the HDD is inside the
> driver domain, Dom0 doesn't have access to that image, so there's no
> way to extract the kernel/initrd from the Dom0. =


The usual way to deal with is to create a vbd device in dom0 (or which
ever domain runs pygrub) which attached to the backend domain and pass
that to pygrub. This is the sort of thing libxl_device_disk_local_attach
would be expected to handle.

Ian.