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

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Message-ID: <20151106130948.GD2651@codeblueprint.co.uk>
Date:	Fri, 6 Nov 2015 13:09:48 +0000
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	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>, Borislav Petkov <bp@...en8.de>,
	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 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?
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