Re: i386/Xen domU kernels don't boot any more

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Dec 22, 2016 at 03:34:59PM +0100, Maxime Villard wrote:
> I've deeply investigated this, and I don't see what's wrong. The issue I was
> talking about yesterday is apparently unrelated.
> 
> It seems that our i386/xen code somehow does not tolerate having a pa allocated
> before the LDT. In fact, it has nothing to do with lapic and all the things
> I've committed; by definition, putting a pmap_bootstrap_palloc(1) just before
> this line [1] triggers a fault, and I don't understand why. And don't get
> confused: idt_vaddr is used as the LDT, not ldt_vaddr - which obviously makes a
> lot of sense.
> 
> Looks like black magic once again. Moving pmap_init_lapic after idt_paddr is
> allocated makes it work, and I still don't see why.
> 
> I've already spent several hours on this, and verily, I am a bit busy these
> days, so I cannot work more on that now.

I don't have time to look at it either.
But as pmap_init_lapic() seems to be the problem, I disabled it on Xen
(which doesn't need it anyway). So at last Xen/i386 guests shoud boot again
now.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--