Re: [Xen-devel] Driver domains and hotplug scripts, redux

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 27 Jan 2012, Roger Pau Monn�© wrote:
> Hello,
> 
> I have a question regarding driver domains and root hard disks, if the
> root hard disk (the one containing the kernel and ramdisk) is on a
> driver domain, how can we pass the kernel to the Dom0? libvchan seems
> like a good option to pass the kernel and ramdisk from driver domains
> to Dom0, but I would like to hear opinions about that.
> 
> If kernel and ramdisk passing is not implemented, the only way to boot
> from hard disk stored on driver domains is to extract the kernel and
> ramdisk and store them on the Dom0.

Let me describe in more details this scenario for you:
we are using a storage driver domain (the storage controller is assigned
to a domain other than dom0), and dom0 is still responsible for creating
all the other VMs, including the storage driver domain.

How can dom0 create the storage driver domain if the kernel and initrd
of the storage driver domain are on the hard disk?

A simple solution would be having the storage driver domain kernel and
initrd inside dom0 initrd or passed to dom0 through multiboot by the
bootloader as an additional payload (better).
Dom0 should be capable of freeing the memory used this way after
creating the storage driver domain.

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