Re: [PATCH v2] x86/mm: warn on W+x mappings

[Matt Fleming]

On Mon, 12 Oct, at 02:49:36PM, Ingo Molnar wrote:
> 
> 
> So why not unmap them after bootup? Is there any reason to call into EFI code 
> while the system is up and running?

That's where the runtime services code lives. So if you want things
like EFI variables (used by the distro installer, among other things)
you need to map the runtime regions.

You can of course disable that by using the "noefi" kernel parameter,
which should unmap everything for you once you've finished booting.

-- 
Matt Fleming, Intel Open Source Technology Center
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