linux-kernel - RE: [RFC v6][PATCH 0b/4] intel_txt: Intel(R) Trusted Execution Technology support for Linux

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Date:	Wed, 12 Aug 2009 23:42:56 +0800
From:	"Wang, Shane" <shane.wang@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>
CC:	"Cihula, Joseph" <joseph.cihula@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"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>,
	"Wei, Gang" <gang.wei@...el.com>
Subject: RE: [RFC v6][PATCH 0b/4] intel_txt: Intel(R) Trusted Execution
	Technology support for Linux - Details

H. Peter Anvin wrote:
> On 08/12/2009 07:53 AM, Ingo Molnar wrote:
>> * Ingo Molnar <mingo@...e.hu> wrote:
>> 
>>> i reviewed & tried the latest patches. Structure of v6 looks now
>>> looks pretty good, but there are some build problems:
>>> 
>>> arch/x86/kernel/tboot.c: In function 'tboot_probe':
>>> arch/x86/kernel/tboot.c:76: error: implicit declaration of function
>>> 'set_fixmap' arch/x86/kernel/tboot.c:76: error: 'FIX_TBOOT_BASE'
>>> undeclared (first use in this function) arch/x86/kernel/tboot.c:76:
>>> error: (Each undeclared identifier is reported only once
>>> arch/x86/kernel/tboot.c:76: error: for each function it appears
>>> in.) arch/x86/kernel/tboot.c:77: error: implicit declaration of
>>> function 'fix_to_virt' arch/x86/kernel/tboot.c:77: warning: cast to
>>> pointer from integer of different size  
>>> 
>>> config attached.
>> 
>> ok, hpa fixed this bug - i tested it some more and here's the next
>> issue:
>> 
>> arch/x86/built-in.o: In function `tboot_shutdown':
>> (.text+0x2e3b5): undefined reference to
>> `acpi_wakeup_address'arch/x86/built-in.o: In function `tboot_sleep':
>> (.text+0x2e679): undefined reference to `acpi_wakeup_address' 
>> 
>> Config attached below.
>> 
> 
> tboot_sleep() references acpi_wakeup_address, which is only defined if
> CONFIG_ACPI_SLEEP is set.  We *could* make TBOOT require
> CONFIG_ACPI_SLEEP, but that looks like the wrong thing to do to me,
> unless TXT somehow depends on having S3 support.
> 
> 	-hpa

oh, S3 support by TXT is one of TXT support. We have code to secure S3 sleep and resume.
Without S3 support, TXT code is incomplete.

Shane--
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