Re: [Xen-devel] Re: pv_ops dom0 USB fixed

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2008-12-17 at 13:27 -0800, Jeremy Fitzhardinge wrote:
> Ian Campbell wrote:
> > On Wed, 2008-12-17 at 11:26 -0800, Jeremy Fitzhardinge wrote:
> >   
> >>> Also noticed the dom0 builder doesn't (yet) boot bzImages, right?
> >>>   
> >>>       
> >> Yeah.  It's on the todo list, but I don't think anyone's lined up to
> >> do it yet.  Shouldn't be more than a couple of hours work for someone
> >> with some expertise in the area (hint hint).
> >>     
> >
> > The main stumbling block is the lack of any existing decompression code
> > in the hypervisor. I've got half a patch somewhere which uses Linux's
> > inflate.c (it should be in an init section so it's thrown away after
> > boot) but it's not complete, it was a while ago so I don't even recall
> > how not-complete it was. I can dig it out if someone wants to pick it up
> > before I get back round to it.
> >   
> 
> Ah, right, it was relying on grub to do all the decompression?

Yep.

> > An alternative option might be a multiboot shim which picks apart any
> > bzImage format modules in its input and passes the result down the chain
> > to the next module. e.g. your grub entry might look like:
> >         title bz-xen
> >             kernel unbzimage
> >             module xen.gz dom0_mem=foo
> >             module vmlinuz root=blah
> >             module initrd
> >   
> 
> That might be useful to have, but I don't think it would be easier to 
> implement.

Right, which is why I started down the other route ;-)

Ian.


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