Re: [Xen-devel] bimodal PAE and compatibility

[John Levon <levon@xxxxxxxxxxxxxxxxx>]

On Mon, Jan 08, 2007 at 04:05:36PM +0100, Gerd Hoffmann wrote:

> > We currently ship a PAE 32-bit domU that we can trivially make bimodal,
> > except that if we set it to "bimodal", then older Xens will default to
> > thinking the domU is not PAE:
> > 
> > 353     dsi->pae_kernel = PAEKERN_no;
> > 354     if ( dsi->__elfnote_section )
> > 355     {
> > 356         p = xen_elfnote_string(dsi, XEN_ELFNOTE_PAE_MODE);
> > 357         if ( p != NULL && strncmp(p, "yes", 3) == 0 )
> > 358             dsi->pae_kernel = PAEKERN_extended_cr3;
> > 
> > Could we have a new note instead?
> 
> I don't think it improves the situation, for older Xens you need two
> kernels anyway, even if the only difference is the content of the
> pae_mode elf note ...

What do you mean? Are you saying that Xen complains about an ELF note it
doesn't understand? That would be unfortunate.

john

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