Re: [PATCH early-RFC 2/5] xen/arm64: Rework the memory layout

[Julien Grall <julien@xxxxxxx>]

On 25/03/2022 14:36, Julien Grall wrote:
> > > > > be loaded at (512GB + 2MB). This requires a slight tweak of the boot
> > > > > code as XEN_VIRT_START cannot be used as an immediate.
> > > > >
> > > > > Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
> > > > >
> > > > > ---
> > > > >
> > > > >     TODO:
> > > > >         - I vaguely recall that one of the early platform we 
> > > > > supported add
> > > > >           the memory starting in high memory (> 1TB). I need to check
> > > > >           whether the new layout will be fine.
> > > > I think we have some Juno with some memory like that, tell me if you 
> > > > need help here.
> > > Would you be able to check the memory layout and confirm?
> > I checked and the Juno we have as the high memory a lot lower than that:
> > RAM: 0000000880000000 - 00000009ffffffff
> >
> > No idea why it was a lot higher in my mind.
> I have only encountered one board with the memory over 512GB. I can't 
> remember whether it is AMD Seattle or X-Gene.
So I found the answer. This was AMD Seattle where the memory start at 
512GB. So I will map Xen starting at 2TB (so there is a bit of slack).
Cheers,

--
Julien Grall