Re: [Xen-devel] Re: [RFC] [PATCH 0/2] Basic SeaBIOS support for Xen HVM

[Kevin O'Connor <kevin@koconnor.net>]

On Thu, May 26, 2011 at 04:13:37PM +0100, Ian Campbell wrote:
> On Tue, 2011-05-24 at 22:44 -0400, Kevin O'Connor wrote:
> > On Tue, May 24, 2011 at 12:02:07PM +0100, Ian Campbell wrote:
> > > Would that involve pulling a bunch of mainboard specific stuff from
> > > coreboot into SeaBIOS?
> > 
> > The idea - when it was last raised - was to provide raw info in a
> > coreboot specific manor (via the "coreboot tables"), and then have
> > SeaBIOS populate ACPI/SMBIOS/MPTable/etc. from that info.  It was
> > never pursued.
> 
> Speaking of coreboot tables... I also need to pass some start of day
> info into seabios (ACPI tables, e820 etc). Currently I just used a
> little ad-hoc data structure at a known physical address but I wonder if
> perhaps I should/could reuse the coreboot table datastructures? They are
> existing and well defined and I suppose they are pretty static, but I
> don't want to add any additional compatibility burden if you guys would
> rather avoid it.

Will Xen support the fw_cfg interface?  If so, passing this info
should be possible through that interface.  Another thing to consider
would be if coreboot+SeaBIOS in place of hvmloader would be a fit.  (I
don't have a good feel for what hvmloader does to judge that.)

Using the coreboot tables in Xen seems a bit odd, but I can't say it
would cause a problem.

-Kevin