Re: [PATCH] Fix VMI crash on boot in 2.6.27+ kernels

[Zachary Amsden]

     A. On Tue, 2008-12-09 at 17:48 -0800, H. Peter Anvin wrote:
> Yinghai Lu wrote:
> > 
> > VMI initialiation can relocate the fixmap, causing early_ioremap
> > to malfunction if it is initialized before the relocation.  The
> > ioremap area is low enough in virtual address space that no actual
> > collision occurs, however, because the pagetables for it were not
> > allocated under VMI mode, the pagetable updates are dropped by
> > the hypervisor as irrelevant, resulting in a crash on boot.
> > 
> 
> I have mentioned in the past that I think the very concept of relocating
> the fixmap to be utterly braindead.  Instead, I believe we should locate
> it low in kernel space so it doesn't have to be relocated.  It's
> unfortunately a relatively large change.

I agree, but a bit too late for 2.6.27 stable and 2.6.28-rc.

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