Re: [Xen-devel] Proposal for init/kexec/hotplug format for Xen

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 26 Feb 2005, at 20:57, Rusty Russell wrote:

>         This has a degree of overlap with Jeremy's excellent work: I've been
> looking at the bundling of device information passed to guest OSes when
> they boot, and future uses for kexec and possibly the implementation of
> hotplug.
>
>         For kexec and bare-metal bringup, the PPC64 port uses a fairly simple
> header + flattened tree of keyword/value pairs (on PPC64, used to hold
> the Open Firmware tree plus Linux extras).  This offers flexibility for
> new virtual devices, etc; I propose that we adopt this format or
> something very similar for Xen, first by putting a pointer into it in
> start_info_t, and then migrate entries across as appropriate.
I like the idea of bringing out device discovery, bringup, teardown, 
recovery all into its own driver or subsystem -- it seems the obvious 
way to go. But I think the 'device tree' should be in the 
to-be-designed persistent store, and we publish an interface to allow 
guests to peek/poke that store.
 -- Keir



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