linux-kernel - Re: [PATCH] x86, efi: 1:1 pagetable mapping for virtual EFI calls

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Message-Id: <5049C12B020000780009998C@nat28.tlf.novell.com>
Date:	Fri, 07 Sep 2012 08:40:59 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Vasco Dias" <rafa.vasco@...il.com>,
	"Matt Fleming" <matt.fleming@...el.com>,
	"Matthew Garrett" <mjg@...hat.com>, <linux-efi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <cJ-ko@...gloub.eu>
Subject: Re: [PATCH] x86, efi: 1:1 pagetable mapping for virtual EFI
 calls

>>> On 06.09.12 at 19:07, "H. Peter Anvin" <hpa@...or.com> wrote:
> Anyone care to refresh my memory why we can't use the "global" 
> 1:1+kernel map, possibly with some improvements (which would benefit the 
> users of those maps too)?  With that I mean initial_page_map on i386 and 
> trampoline_pgd on x86-64...

I don't think you want anything inserted in the low part of those
(kernel-only) page tables, not even transiently.

Jan

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