linux-kernel - Re: [PATCH] intel_txt: add s3 userspace memory integrity verification

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Message-ID: <4B198C18.7040500@zytor.com>
Date:	Fri, 04 Dec 2009 14:24:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Pavel Machek <pavel@....cz>
CC:	"Cihula, Joseph" <joseph.cihula@...el.com>,
	"Wang, Shane" <shane.wang@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"jbeulich@...ell.com" <jbeulich@...ell.com>,
	"peterm@...hat.com" <peterm@...hat.com>
Subject: Re: [PATCH] intel_txt: add s3 userspace memory integrity verification

On 12/04/2009 02:15 PM, Pavel Machek wrote:
>>>
>>> Are  you sure x86-64 kernel & modules is always below 4GB? I don't
>>> think so.

The x86-64 kernel is run where it is loaded by the boot loader.  For
most boot loaders, that will mean < 4 GB.  This is not the case for
modules, and they cannot and should not rely on modules inside
restricted zone.

This effectively becomes a constraint on whatever boot loader is used to
load the kernel for it to be compatible with tboot.

	-hpa
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