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

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Date:	Fri, 6 Nov 2015 14:24:47 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Matt Fleming <matt@...eblueprint.co.uk>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Dave Jones <davej@...emonkey.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Kees Cook <keescook@...omium.org>, linux-efi@...r.kernel.org
Subject: Re: [GIT PULL] x86/mm changes for v4.4

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?

Yap:

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

vs

ffffffef00000000 - ffffffff00000000 EFI region in trampoline_pgd

the new pagetable will make that issue moot too.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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