linux-kernel - Re: [PATCH, TRIVIAL] Add more explicit dependencies for CONFIG_INTEL

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Date:	Fri, 21 Jan 2011 10:58:59 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Jonathan McCune <jonmccune@....edu>
Cc:	linux-kernel@...r.kernel.org, tboot-devel@...ts.sourceforge.net,
	trivial@...nel.org
Subject: Re: [PATCH, TRIVIAL] Add more explicit dependencies for
 CONFIG_INTEL_TXT

On Fri, 21 Jan 2011 13:39:19 -0500 Jonathan McCune wrote:

> This patch makes the documentation slightly more explicit about how to
> enable Intel TXT support in the kernel, and adds two dependencies to
> the relevant option in Kconfig.  Without this patch it is difficult to
> determine how to enable Intel TXT support without some knowledge of
> Kconfig.
> 
> Signed-off-by: Jonathan McCune <jonmccune@....edu>
> 
> ---
>  Documentation/intel_txt.txt |    4 +++-
>  security/Kconfig            |    2 +-
>  2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/intel_txt.txt b/Documentation/intel_txt.txt
> index 849de1a..8487f76 100644
> --- a/Documentation/intel_txt.txt
> +++ b/Documentation/intel_txt.txt
> @@ -196,7 +196,9 @@ Execution Technology (TXT)".  It is marked as
> EXPERIMENTAL and
>  depends on the generic x86 support (to allow maximum flexibility in
>  kernel build options), since the tboot code will detect whether the
>  platform actually supports Intel TXT and thus whether any of the
> -kernel code is executed.
> +kernel code is executed. The kernel option for enabling Intel TXT
> +support will only appear if its dependencies are also enabled.
> +These are CONFIG_DMAR and CONFIG_PCI_MSI.

Shouldn't that comment match the "depends on" line below??


>  The Q35_SINIT_17.BIN file is what Intel TXT refers to as an
>  Authenticated Code Module.  It is specific to the chipset in the
> diff --git a/security/Kconfig b/security/Kconfig
> index 95accd4..5fd4e35 100644
> --- a/security/Kconfig
> +++ b/security/Kconfig
> @@ -136,7 +136,7 @@ config SECURITY_PATH
> 
>  config INTEL_TXT
>  	bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)"
> -	depends on HAVE_INTEL_TXT
> +	depends on HAVE_INTEL_TXT && EXPERIMENTAL && DMAR && ACPI
>  	help
>  	  This option enables support for booting the kernel with the
>  	  Trusted Boot (tboot) module. This will utilize
> -- 


---
~Randy
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