Re: [GIT PULL] x86/mm changes for v4.4

From: Borislav Petkov
Date: Fri Nov 06 2015 - 08:25:01 EST

On Fri, Nov 06, 2015 at 01:09:48PM +0000, Matt Fleming wrote:
> On Thu, 05 Nov, at 11:05:35PM, Andy Lutomirski wrote:
> >
> > Admittedly, we might need to use a certain amount of care to avoid
> > interesting conflicts with the vmap mechanism. We might need to vmap
> > all of the EFI stuff, and possibly even all the top-level entries that
> > contain EFI stuff (i.e. exactly one of them unless EFI ends up *huge*)
> > as a blank not-present region to avoid overlaps, but that's not a big
> > deal.
> There shouldn't be any room for conflicting with vmap() because the VA
> region where we map EFI regions is still carved out especially for us.
> Right Boris?


ffffea0000000000 - ffffeaffffffffff (=40 bits) virtual memory map (1TB)


ffffffef00000000 - ffffffff00000000 EFI region in trampoline_pgd

the new pagetable will make that issue moot too.


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