linux-kernel - Re: [RFC v5][PATCH 2/4] intel_txt: Intel(R) TXT reboot/halt shutdown support

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Date:	Wed, 24 Jun 2009 20:46:50 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Joseph Cihula <joseph.cihula@...el.com>
cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, arjan@...ux.intel.com,
	hpa@...or.com, andi@...stfloor.org, chrisw@...s-sol.org,
	jbeulich@...ell.com, peterm@...hat.com, gang.wei@...el.com,
	shane.wang@...el.com
Subject: Re: [RFC v5][PATCH 2/4] intel_txt: Intel(R) TXT reboot/halt shutdown
 support

On Mon, 22 Jun 2009, Joseph Cihula wrote:

> Support for graceful handling of kernel reboots after an Intel(R) TXT launch.
> 
> Without this patch, attempting to reboot or halt the system will cause the
> TXT hardware to lock memory upon system restart because the secrets-in-memory
> flag that was set on launch was never cleared.  This will in turn cause BIOS
> to execute a TXT Authenticated Code Module (ACM) that will scrub all of memory
> and then unlock it.  Depending on the amount of memory in the system and its type,
> this may take some time.
> 

Does this mean that after a power failure, the system will perform this 
memory scrub on the next boot?  How long does it take per MB on a typical 
system?


-- 
James Morris
<jmorris@...ei.org>
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